Updated on 2025/06/18

Information

 

写真a

 
ALOWAISY ADEL
 
Organization
Faculty of Engineering Department of Civil and Structural Engineering Assistant Professor
School of Engineering (Concurrent)
Graduate School of Engineering (Concurrent)
Title
Assistant Professor
Contact information
メールアドレス
Tel
0928023378
Profile
My research interests in the field of geotechnical engineering primarily focus on unsaturated soil mechanics, ground improvement, and geo-environmental engineering, with the goal of establishing fundamental knowledge that contributes to a safe and sustainable society. Deploying experimental, numerical, and analytical approaches, my research interests fall into three main areas: 1) Fundamentals of unsaturated soil mechanics: Practical unsaturated soil mechanics relies primarily on determining the hydromechanical properties in a timely manner. We challenge the development of rapid in-door and in-situ testing methods for determining the water retention, hydrological conductivity, and mechanical properties of unsaturated soils. The developed systems, including the Continuous Pressurization Method and Multi-sample testing method, enable the determination of hydromechanical properties of unsaturated soils in less than 10% of the time required by the conventional method. The systems are deployed to investigate the dependency of unsaturated hydromechanical properties on the hydrological path, reflecting the water filling or leaving the pores. 2) Environmentally friendly technology to combat desertification in semi-arid regions: Land degradation in arid and semi-arid regions is strongly related to moisture deficiency in the comprising soil profiles due to the huge difference in rainfall and evaporation fluxes. The majority of the existing technologies focus on the infiltration flux to achieve a more efficient watering system. In contrast, our group focuses on evaporation flux and challenges extending unsaturated soil hydromechanics to evaluate evapotranspiration fluxes. As a countermeasure, we focus on developing soil cover-barrier systems that utilize the relative layering pore-scale characteristics as a simple solution for suppressing water losses due to evaporation. The system's efficiency and applicability are being tested as part of international greening collaborative projects in arid regions. 3) Towards achieving carbon neutrality: Carbon utilized industrial by-products as an alternative source for granular geomaterials: Securing suitable granular material for various earthworks is a recurring challenge facing geotechnical engineers. Meanwhile, curbing GreenHouse Gas emissions has been challenging for decades. We investigate the possibility of artificially utilizing CO2 in industrial by-products, such as concrete rubbles and steel slag, to develop an alternative sustainable source for granular geo-materials. Currently, our research includes developing artificial CO2 fixation methods and evaluating the material characteristics and their environmental impact for various geotechnical applications.

Research Areas

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Geotechnical engineering

Degree

  • Doctor of Engineering ( 2019.9 )

Research History

  • 九州大学, 工学院 [学術研究員] 2019.10~2020.03 Kyushu University, Graduate School of Engineering [Postdoc fellow] 2019.10~2020.03 九州大学, 工学院 [特任助教] 2020.04~2022.03 Kyushu University, Graduate School of Engineering [Research Assistant Professor] 2020.04~2022.03   

Research Interests・Research Keywords

  • Research theme: Towards achieving carbon neutrality: Utilization of industrial by-products in geotechnical engineering

    Keyword: Carbon neutrality, Earth reinforcement, Recycled material

    Research period: 2022.4 - 2030.3

  • Research theme: Natural slopes and river levees stability under heavy rainfall and earthquake events

    Keyword: Geo- disasters, Seepage, Stability

    Research period: 2019.10

  • Research theme: Development of a rapid testing method for simultaneous determination of the water retention, hydraulic, and mechanical properties of unsaturated soils

    Keyword: Unsaturated soil, SWCC, HCF, Unsaturated Soil shear strength

    Research period: 2016.10

  • Research theme: Innovative environmental friendly solutions to combat desertification in arid and semi-arid regions

    Keyword: Desertification, Soil cover system, Capillary barrier, Environmental friendly

    Research period: 2016.10

Awards

  • Excellent presentation award

    2024.7   The Japanese Geotechnical Society   A Multi-sample testing system utilizing the continuous pressurization method for determining unsaturated soil mechanical properties

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  • 2023 JALS encouragement award

    2023.5   The Japanese Association for Arid Land Studies   Optimizing the efficiency of a soil cover system based on the pore structure characteristics and its applicability in arid regions

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  • Excellent presentation award

    2019.9   Japan Society of Civil Engineers   Pore-water pressure measurement necessity when determining the SWCC utilizing the axis-translation technique

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  • Excellent presentation award

    2018.9   Japan Society of Civil Engineers   Spatial variations of the unsaturated hydraulic properties at the heavy rainfall induced landslide in Asakura, Fukuoka

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  • 第72回年次学術講演会優秀講演者

    2017.9   Japan Society of Civil Engineers   Excellent presentation award

    Validation of the ContinuousontinueCs Pressurization Method apparatus by the conventional staged pressurization method [axis-translation technique]

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  • 2017 Student's Award of Excellence

    2017.5   The Kyushu Branch of Japanese Geotechnical Society   Micro-scale evaluation and modeling of fluid movement and the related boundary fluxes [mainly evaporation] through unsaturated porous medium

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    Country:Japan

  • Excellent paper award

    2016.11   8th Asian Joint Symposium on Geotechnical and Geo-environmental Engineering JS-Tainan 2016   Optimizing adaptations and experimental evaluation of the actual evaporation and water redistribution through double layered soil profiles

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    Award type:Award from international society, conference, symposium, etc.  Country:Taiwan, Province of China

  • Excellent presentation award

    2016.9   Japan Society of Civil Engineers   Influence of top layer density on the actual evaporation rate and water storage through coarse overlying fine sand profiles

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  • Ambassadors for Dialogue Award

    2012   East & West Center for the Development of Human Resources, Jordan, and the Office of Career Development, King Abdullah II Fund, AL-AHLIYYA AMMAN UNIVERSITY  

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    Country:Jordan

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Papers

  • Analysis of the surface layer properties influence on the actual evaporation and efficiency of the soil-cover system to combat desertification. Reviewed International coauthorship International journal

    Adel Alowaisy, Jumana Hussary, Noriyuki Yasufuku, Ryohei Ishikura, Monther Abdelhadi

    Journal of Arid Land Studies   32   171 - 175   2022.12

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    Global warming is one of the most alarming environmental issues worldwide, disrupting the natural water cycle and exacerbating desertification. Proper understanding of the soil-atmosphere fluxes (mainly evaporation) is crucial. Most existing studies focus on the evaporation stages and the governing mechanisms. However, an environmental-friendly simple method to control the actual evaporation flux in arid regions is in great need to efficiently combat desertification. Trough this paper, a simple design concept for a soil cover to maximize water conservation is proposed based on a series of 1-D column tests. It was found that using a coarse cover layer, the head gradient is oriented towards the bottom layer, disrupting the water supply to the surface and limiting the evaporation flux. While a fine cover induces a reversed head gradient oriented towards the cover layer, ejecting the water from the bottom to the top and resulting in a higher water loss. The proposed cover design includes two criteria: a) relative retention potential. b) relative cover thickness. The water storage capability can be maximized by applying a proper cover to minimize the criteria values.

    DOI: https://doi.org/10.14976/jals.32.S_171

  • Rapid determination of the unsaturated hydraulic conductivity for sandy soils utilizing the continuous pressurization method Reviewed

    Adel Alowaisy, Noriyuki Yasufuku Ryohei Ishikura, Masanori Hatakeyama, Kyono Shuu

    The 20th International Conference on Soil Mechanics and Geotechnical Engineering (ICSMGE20)   1413 - 1418   2022.5

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    Authorship:Lead author   Language:English   Publishing type:Research paper (other academic)  

    Proper determination of the unsaturated soil hydrological and retention properties, including the Soil Water Characteristics Curve (SWCC) and the Hydraulic Conductivity Function (HCF), is crucial for understanding the behavior of unsaturated soil profiles. The conventional SWCC and HCF determination approaches are characterized by several limitations associated with the testing complexity, discrete measurements, and prolonged testing time. Therefore, a simple, continuous, rapid, and concurrent SWCC and HCF determination technique is in great need. Through this paper, the Continuous Pressurization Method (CPM) was extended, and a novel quasi-state model was proposed to concurrently determine the SWCC and the HCF. It was found that the proposed quasi-state model adopting the extended CPM is an accurate, reliable, and rapid method that allows for a concurrent and continuous determination of the SWCC and the HCF in less than 3% of the time required using the conventional methods. Furthermore, an indisputable hysteresis in the HCF was observed where comparing the drying and wetting phases, the unsaturated coefficient of hydraulic conductivity varies up to one order difference for the same volumetric water content (or matric suction).

  • Pore structure and falling rate stage of evaporation in homogeneous sandy soil profiles Reviewed International coauthorship International journal

    Jumana Hussary, Adel Alowaisy, Noriyuki Yasufuku, Ryohei Ishikura, Monther Abdelhadi

    Soils and Foundations   62 ( 2 )   2022.4

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    Language:English   Publishing type:Research paper (scientific journal)  

    Recently, climate change has been causing severe droughts and water scarcity in drylands. A proper understanding of the soil surface-atmosphere boundary fluxes is essential to combatting such environmental problems. In those regions, evaporation is considered to be the dominant flux. It is divided into three stages that follow different mechanisms and are highly dependent on the soil properties. Most of the existing studies focus on the evaporation process from a macroscale perspective and estimate the evaporation rate based on the atmospheric conditions, while only a few of them consider the soil properties. This paper studied the influence of the soil pore structure on the actual evaporation and formation of the unsaturated layer. Homogeneous drying sandy soil column tests were conducted under a unified low atmospheric demand. The pore structure was investigated by varying the texture and relative density. The significance of Stage 2 in the evaporation process was asserted. Additionally, it was affirmed that vapor diffusion is dominant during Stage 2, where the actual evaporation reduction rate depends on the receding rate of the vaporization plane. Finally, a comprehensive, robust, and easily determined index, that correlates well with the duration and evaporated water during Stage 1 and Stage 2, was proposed. The Pore Size Distribution Index (IPSD) was found to reflect the variations in the pore structure and to consider the capillary and diffusion flow mechanisms. It serves as a fundamental step towards evaluating the actual evaporation and drying front depth during the evaporation process.

    DOI: https://doi.org/10.1016/j.sandf.2022.101108

  • Continuous pressurization method for a rapid determination of the soil water characteristics curve for remolded and undisturbed cohesionless soils Reviewed International journal

    Adel Alowaisy, Noriyuki Yasufuku, Ryohei Ishikura, Masanori Hatakeyama, Shuu Kyono

    Soils and Foundations   60 ( 3 )   634 - 647   2020.6

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    Language:English   Publishing type:Research paper (scientific journal)  

    Natural disasters like earthquakes and heavy rainfall events induce slope failures and other disasters. Proper determination of the water retention properties of porous mediums is necessary. The conventional Soil Water Characteristics Curve (SWCC) determination techniques are limited due to their complexity and lengthy time required. A highly accurate simple remolded and undisturbed samples SWCC determination method that requires a short time is lacking. A novel automatic system which adopts the continuous pressurization method and allows the direct determination of the SWCC in a short time suitable for use with remolded and undisturbed samples was developed. The accuracy of the newly developed system was validated, and it was shown to have excellent repeatability. It is a reliable and direct method that requires a short time for the SWCC determination, with the drying and wetting SWCCs obtainable in less than 10% of the time required using the conventional multi-step flow method. Consideration of the pore water pressure was shown to be necessary when calculating the matric suction utilizing the axis-translation technique. Finally, because remolded samples do not properly represent the in-situ natural conditions, the significant discrepancies should be carefully considered when conducting analysis and proposing countermeasures against unsaturated soil-related Geo-disasters.

    DOI: https://doi.org/10.1016/j.sandf.2020.03.014

  • The application of CO2-fixed recycled fine aggregate as filler of sand compaction piles Reviewed

    Shou Nishiie, Takao Kono, Ryohei Ishikura, Adel Alowaisy

    International Conference on Deep Foundations and Ground Improvement (DFI-EFFC 2025)   308 - 313   2025.5

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • Swelling characteristics of unaged steel slag due to immersion in water for utilization as a geomaterial Reviewed

    Keito Horii, Ryohei Ishikura, Adel Alowaisy, Jumana Hussary

    International Joint Symposium Surabaya Indonesia 2024 (JS-Surabaya)   67 - 72   2024.12

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • Evaluation of the unsaturated shear strength along the drying-wetting paths using the one-sample system for soils with different gradations Reviewed

    Maya Parker, Adel Alowaisy, Ryohei Ishikura, Jumana Hussary, Noriyuki Yasufuku,Masanori Hatakeyama, Shuu Kyono, Fumihiro Mochida

    International Joint Symposium Surabaya Indonesia 2024 (JS-Surabaya)   62 - 66   2024.12

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • Morphological investigation of recycled concrete particles following CO2 fixation via the wet carbonation method Reviewed

    Jumana G. Hussary, Adel M. Alowaisy, Ryohei Ishikura, Shugo Kai, Noriyuki Yasufuku, Takao Kono, Shou Nishiie

    International Joint Symposium Surabaya Indonesia 2024 (JS-Surabaya)   56 - 61   2024.12

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • Bearing capacity characteristics and reinforcing mechanism of mattress ground method focusing on the tensile stiffness of geotextile Reviewed

    松尾大樹、石藏良平、辻慎一朗、板垣聡、安福規之、アロウイシーアデル、杉本知史

    第16回地盤改良シンポジウム論文集[Ground Improvement Symposium]   420 - 423   2024.10

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    Language:Japanese   Publishing type:Research paper (international conference proceedings)  

  • A practical prediction method and its application to the post-crushing grain size of granular materials using rotary crushing and mixing machine Reviewed

    安福規之、アロウイシーアデル、荘恵民、石藏良平、秋山直樹

    第16回地盤改良シンポジウム論文集[Ground Improvement Symposium]   213 - 219   2024.10

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    Language:Japanese   Publishing type:Research paper (international conference proceedings)  

  • Hexavalent chromium elution characteristics of recycled concrete carbonated utilizing the drying method for SCP application Reviewed

    阪本優平、石藏良平、アロウイシー アデル、安福規之、フサリ ジュマナ、峰渉磨、甲斐柊吾、河野貴穂、西家翔

    第16回地盤改良シンポジウム論文集[Ground Improvement Symposium]   496 - 499   2024.10

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    Language:Japanese   Publishing type:Research paper (international conference proceedings)  

  • Piping Failure Risk Assessment of River Levee Foundation Ground Based on Statistical Data of Geological and Geotechnical Properties Reviewed

    石藏良平、小無田大翔、笠間清伸、アロウイシーアデル、安福規之

    第16回地盤改良シンポジウム論文集[Ground Improvement Symposium]   452 - 456   2024.10

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    Language:Japanese   Publishing type:Research paper (international conference proceedings)  

  • Influence of the fines content on the CO2 capturing and hexavalent chromium elution of recycled concrete aggregates using the wetting carbonation method. Reviewed

    峰渉磨、アロウイシー アデル、石藏良平、安福規之、フサリ ジュマナ、阪本優平、甲斐柊吾、河野貴穂、西家翔

    第16回地盤改良シンポジウム論文集[Ground Improvement Symposium]   609 - 613   2024.10

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    Language:Japanese   Publishing type:Research paper (international conference proceedings)  

  • Physical, mechanical and chemical properties of recycled concrete carbonated as ground improvement material Reviewed

    Ryohei Ishikura, Adel Alowaisy, Jumana Hussary, Noriyuki Yasufuku, Takao Kono, Sho Nishiie

    "地盤工学会誌 Journal of Geotechnical Engineering"   72 ( 9 )   27 - 32   2024.9

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  • Settlement forecast of marine soft soil ground improved with prefabricated vertical drain-assisted staged riprap filling Reviewed International coauthorship International journal

    Xue-Ting Wu, Jun-Ning Liu, Adel Alowaisy, Noriyuki Yasufuku, Ryohei Ishikura, Meilani Adriyati

    Journal of Buildings   14   pp. 1316   2024.5

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    Language:English   Publishing type:Research paper (scientific journal)  

    By comparing different settlement forecast methods, eight methods were selected considering the creep of marine soft soils in this case study, including the Hyperbolic Method (HM), Exponential Curve Method (ECM), Pearl Growth Curve Modeling (PGCM), Gompertz Growth Curve Modeling (GGCM), Grey (1, 1) Model (GM), Grey Verhulst Model (GVM), Back Propagation of Artificial Neural Network (BPANN) with Levenberg–Marquardt Algorithm (BPLM), and BPANN
    with Gradient Descent of Momentum and Adaptive Learning Rate (BPGD). Taking Lingni Seawall soil ground improved with prefabricated vertical drain-assisted staged riprap filling as an example, forecasts of the short-term, medium-term, long-term, and final settlements at different locations of the soft ground were performed with the eight selected methods. The forecasting values were compared with each other and with the monitored data. When relative errors were between 0 and −1%, both the forecasting accuracy and engineering safety were appropriate and reliable. It was concluded that the appropriate forecast methods were different not only due to the time periods during the
    settlement process, but also the locations of soft ground. Among these methods, only BPGD was appropriate for all the time periods and locations, such as at the edge of the berm, and at the center of the berm and embankment.

    DOI: https://doi.org/10.3390/ buildings14051316

  • On the efficiency of the rotary crushing and mixing technique for enhancing the gradation properties of low-quality geomaterials Reviewed

    安福規之, アロウイシー アデル, 石藏良平, 中島典昭

    会誌「材料」: Journal of the Society of materials Science, Japan   73 ( 1 )   8 - 13   2024.1

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Providing a sustainable supply of good-quality soil materials is vital for reliable implementation of earthworks. However, ensuring a sustainable supply is of great difficulty in the present. Therefore, various techniques are deployed in practice, including mixing several types and gradations of soils or mixing with additives such as cement and quicklime. Among other methods, the Rotary Crushing and Mixing technique(RCM) was introduced as a reliable method to modify and control the gradation properties of granular materials2). Through this study, the efficiency of the small type of the RCM series, which is commonly used in practice, is investigated experimentally to elaborate on the role of particle crushing in improving the gradation properties of soil materials. Furthermore, a simple method is proposed considering the single-particle strength for estimating the particle size distribution of a soil material improved using the RCM. The accuracy of the method and its validity were confirmed using several materials, aiming at enhancing the practical efficiency of particle size adjustment methods.

  • Influence of the Hydraulic Gradient Pattern and Fines Content on the Internal Erosion Characteristics of Glass Beads Granular Material Reviewed

    Nontouch Sirithatthamrong, Ryohei Ishikura, Tomohiro Nagasaki, Adel Alowaisy, Noriyuki Yasufuku

    第15回環境地盤工学シンポジウム   407 - 413   2023.11

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    Language:English   Publishing type:Research paper (other academic)  

    Internal erosion is a natural phenomenon in which fine soil particles are removed from the ground through
    water seepage, with more cases being reported with the change in rainfall patterns and intensity. This phenomenon leads to an increase in the voids through the soil profile and the deterioration of the bearing capacity. Therefore, a proper understanding of internal erosion is vital for optimizing the longevity of soil structures and preventing erosion-related disasters. This research aims to define the characteristics of internal erosion focusing on soil properties and the role of hydraulic loading patterns. Multiple soil mixtures containing different amounts of fines were tested. It was found that regardless of the hydraulic gradient pattern, a critical fines content ratio of 10% was observed. Meanwhile, samples with fines ratios ranging from 7.5% to 12.5% were more susceptible to suffusion. In contrast, samples with higher fines content, namely 15% to 20%, are more susceptible to clogging, which was confirmed to be more significant in the tested samples' middle layer. Furthermore, it was confirmed that the internal stability index chart may be used accurately as an index for predicting internal erosion. A monotonical increment hydraulic gradient pattern results in the highest erosion rate through all soil samples regardless of different fines content. A good correlation between cumulative erosion rate and the seepage energy within 6 hours was observed. Regardless of hydraulic gradient pattern, the cumulative erosion rate by mass can be generally assumed equal when the flow volume is equal. Thus, there exists a strong relationship between the cumulative flow volume through hydraulic loading history with seepage energy.

  • Applicability and effectiveness of sheet-type sensors in locating the slip failure during seepage through embankments Reviewed

    Ryota Araki, Ryohei Ishikura, Noriyuki Yasufuku, Adel Alowaisy, Takahiro Sakon & Masatsugu Uematsu

    The 2nd International Conference on Construction resources for Environmentally Sustainable Technologies (CREST-2023)   49 - 59   2023.11

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    Language:English   Publishing type:Research paper (other academic)  

    Recently, damages to river levees caused by torrential rains have increased dramatically. As the frequency of heavy rainfall events is expected to increase due to climate change, it is necessary to take adequate countermeasures to prevent damage to river embankments. Among several damage patterns to river embankments, the slip failures associated with water seepage are directly related to the variations in the degrees of saturation throughout the comprising soil profiles. As the seepage forces increase in linkage with the rise of the river water level, it is essential to monitor and predict the changes in the water content and displacement in the embankment to develop reliable solutions. Efficiently proposing countermeasures for such a problem requires monitoring and considering the changes in water content and shear strain within the embankment, where generally, the rise in river water level is associated with an increase in the seepage forces. Through this study, a sheet-type sensor to continuously measure the changes in water content, strain, and temperature, both horizontally and vertically, was developed and utilized to understand the mechanism and enhance the resiliency of levees. Furthermore, the sensor measurements are utilized to elaborate on the pre-failure indicators through a model experiment.

    DOI: https://doi.org/10.1007/978-981-99-9223-2_5

  • Deterioration characteristics of cement stabilized soils with different fine fraction content under seawater environment Reviewed

    Ryohei Ishikura, Noriyuki Yasufuku, Adel Alowaisy, Takao Kono, Takuma Fujisawa

    9th International Congress on Environmental Geotechnics (9ICEG)   39 - 48   2023.6

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    Soft ground is widely distributed in the coastal areas of Japan, and the cement stabilization method is commonly used as a countermeasure to the associated problems. However, recently, it was reported that cement stabilized soil might deteriorate when exposed to seawater for an extended time in such regions. The deterioration mechanism of cement stabilized soil is still not well understood, and a general method for predicting the deterioration progress is lacking. In this study, the influence of the fine fraction content of the cement stabilized soils’ base material on the seawater resistance was investigated, and the deterioration characteristics when exposed to seawater were discussed. The results of chemical analysis by the μXRF test showed that the leaching of Ca, penetration of Mg, and penetration of sulfate(S) increased with depth for the specimens with higher fine fraction. Finally, the penetration of sulfate (S) in seawater was confirmed as one of the causes of the strength deterioration of cement stabilized soil. Furthermore, the distribution of S concentration through the specimens was expressed using the diffusion equation, assuming that the penetration of S into the specimens proceeds in the same way as the diffusion of material with concentration. The predicted deterioration depths were compared with the results obtained in the laboratory.

    DOI: https://doi.org/10.53243/ICEG2023-191

  • Actual evaporation reduction rate considering the pore structure of sandy soils Reviewed

    Jumana Hussary, Adel Alowaisy, Noriyuki Yasufuku, Ryohei Ishikura

    17th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering 2023 (17ARC)   1866 - 1870   2023.4

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    The falling rate stage of evaporation (Stage 2) is dominant in drylands and responsible for most water loss in the field. Therefore, predicting its evaporation rates is of a great importance. Through an experimental approach and using Fick’s law of diffusion, a new determination method of the actual evaporation reduction rate during Stage 2 is proposed in this study. The model indicates that the water flux during Stage 2 is controlled by the receding rate of the vaporization plane, which is in turn dependent on the pore properties of the soil profile.

    DOI: https://doi.org/10.1201/9781003299127-284

  • Drying Front and Vaporization Plane Dynamics during Evaporation from Homogeneous Soil Profiles Reviewed International coauthorship

    Jumana Hussary, Adel Alowaisy, Noriyuki Yasufuku, Ryohei Ishikura, Monther Abdelhadi

    8th International Conference on Unsaturated Soils (UNSAT2023)   382   2023.4

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    Global warming has caused many lands to degrade, making them vulnerable to desertification. Therefore, finding innovative solutions is essential to prevent such phenomena from exacerbating. However, this requires a comprehensive understanding of the unsaturated layer formed due to the high-water loss from soil profiles by evaporation. In the present study, a new technique to trace the unsaturated layer from drying soil profiles was developed, and its accuracy and reliability were confirmed. Consequently, the spatial and temporal development of the drying front, vaporization plane, and film region were investigated for two soil profiles of different pore structures. It was found that soil profiles with broader pore distribution lose water from deeper drying fronts during Stage 1, while diffusion during Stage 2 occurs from shallower depths. Moreover, the film region’s thickness increased at early drying stages, followed by a slight drop associated with the onset of Stage 2. During Stage 2, the thickness slightly fluctuated until reaching the same thickness at the end of Stage 1, where a second significant drop in the thickness was observed.

    DOI: https://doi.org/10.1051/e3sconf/202338221003

  • An analytical study on enhancing water preservation utilizing the capillary barrier system in drylands for cultivation Reviewed International journal

    Yuichiro Ito, Zentaro Furukawa, Adel Alowaisy, Noriyuki Yasufuku, Ryohei Ishikura

    Journal of Arid Land Studies   32   101 - 105   2022.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    This research aims at developing a water retention technology utilizing the capillary barrier (CB) concept for irrigat¬ed ground in drylands using local geo-materials. To increase the water retention by CB, where plants can grow pre-planting stage in dryland, clarifying the including the layers’ thicknesses ratio, grain size distributions, and watering method through experimental and numerical approaches is considered. The main findings include 1) The experiment of the CB with drip irrigation revealed that the volumetric water content (VWC) at a depth of 200 mm exceeded the target value of at least 0.1 on the third day when watering twice a week with 1000 mL per irrigation. 2) From the numerical analysis, supplying water twice a week was enough to maintain the VWC within a depth of 200 mm higher than the targeted value of 0.1. 3) To maintain at least a target value extending up to 200 mm depth by supplying 1000 mL water twice a week, an optimum configuration with an effective grain size ratio of 5.2, mean grain size ratio of 3.9, and a thicknesses ratio of 0.1 comprised of coarse and fine sandy soil layers was confirmed

    DOI: https://doi.org/10.14976/jals.32.S_101

  • Drying front dynamics during the falling rate stage of evaporation from homogeneous sandy soil profiles Reviewed International coauthorship International journal

    Jumana Hussary, Adel Alowaisy, Noriyuki Yasufuku, Ryohei Ishikura, Monther Abdelhadi

    Journal of Arid Land Studies   32   177 - 180   2022.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    Due to climate change, drylands worldwide have been suffering from extensive droughts and desertification. Finding innova¬tive solutions requires a thorough understanding of the evaporation process dominant in such regions. The process is divided into three stages based on the actual evaporation rate. Previous studies confirmed the significance of Stage 2, the falling rate stage, in drylands. One of the process’s main controlling factors is the drying front, or the region separating the saturated and unsaturated zones. This paper studied the drying front’s spatial and temporal development during Stage 2 in sandy soil profiles that differ in the pore structure. The drying front was determined experimentally using 1-D homogenous drying column tests. Besides, a front depth determination method from the literature was adopted. Both methods showed an acceptable agreement with the front receding rate during Stage 2. Moreover, coarser sandy soils with narrow pore size distribution tend to have shallower front depths. However, during Stage 2, their drying front recedes faster into the soil profile. The is study serves as a fundamental step towards evaluating the drying front during evaporation; It is believed to contribute to designing an environmental-friendly soil cover system used to maximize land water storage.

    DOI: https://doi.org/10.14976/jals.32.S_177

  • Time-dependent development of GBF-slag permeability characteristics focusing on the pore water movement and fine fraction Reviewed

    中山修一朗, 石藏良平, 安福規之, アデル・アロウイシー

    第15回地盤改良シンポジウム論文集   319 - 322   2022.12

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    Language:Japanese   Publishing type:Research paper (other academic)  

  • On the efficiency of particle size control of low-quality geomaterials by rotary crushing and mixing Reviewed

    安福規之,アロウイシ― アデル,石藏良平,中島典昭

    第15回地盤改良シンポジウム論文集   687 - 692   2022.12

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    Language:Japanese   Publishing type:Research paper (other academic)  

  • Evaluation of Elastic Settlement Behavior in Small-Strain Range of Cement-Treated Clayey Soil. Reviewed International coauthorship International journal

    Muhammad Akmal Putera, Noriyuki Yasufuku, Adel Alowaisy, Ryohei Ishikura, Jumana G Hussary, Ahmad Rifa’i

    The Lowland Technology International Journal   24 ( 2 )   1 - 13   2022.10

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    Indonesia is developing high-speed railway lines that are expected to connect the major cities. Along the railway, the lowland area is mainly comprised of clayey soil characterized by a high compressibility index and high water content, which causes soil settlement in the long term. Therefore, to reduce the potential of settlement, choosing a suitable railway structure, such as the ballastless track, is essential. Despite the track structure, the subsoil mechanical properties often require improvement to limit the railways’ settlement. Using cement-treated soil, a combination technique was provided to protect the shallow ground and the ballastless track, effectively reducing the stress distribution during construction periods and maintaining low construction costs for developing countries. To assure longer serviceability, there is a high need for an accurate evaluation of the elastic settlement subjected to train loading. Therefore, this paper proposes an elastic settlement prediction model for cement-treated soils considering the curing period, cement content, and confining pressure within the small-strain ranges. The model optimizes the mixing ratio at a specific curing period, reflecting the wheel-base loading on the cement-treated soil layer. Moreover, a simple power formula to determine the initial mechanical properties of the cement-treated soils was proposed.

  • Evaluating the Small-Strain Mechanical Properties of Cement-Treated Clayey Soils Based on the Confining Pressure. Reviewed International journal

    A.Putera, N.Yasufuku, A.Alowaisy, R.Ishikura, J.Hussary, A.Rifa’i.

    International Journal of Civil and Environmental Engineering   16 ( 10 )   269 - 277   2022.10

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    Indonesia’s government has planned a project for a high-speed railway connecting the capital cities, Jakarta and Surabaya, about 700 km. Based on that location, it has been planning construction above the lowland soil region. The lowland soil region comprises cohesive soil with high water content and high compressibility index, which in fact, led to a settlement problem. Among the variety of railway track structures, the adoption of the ballastless track was used effectively to reduce the settlement; it provided a lightweight structure and minimized workspace. Contradictorily, deploying this thin layer structure above the lowland area was compensated with several problems, such as lack of bearing capacity and deflection behavior during traffic loading. It is necessary to combine with ground improvement to assure a settlement behavior on the clayey soil. Reflecting on the assurance of strength increment and working period, those were convinced by adopting methods such as cement-treated soil as the substructure of railway track. Particularly, evaluating mechanical properties in the field has been well known by using the plate load test and cone penetration test. However, observing an increment of mechanical properties has uncertainty, especially for evaluating cement-treated soil on the substructure. The current quality control of cement-treated soils was established by laboratory tests. Moreover, using small strain devices measurement in the laboratory can predict more reliable results that are identical to field measurement tests. Aims of this research are to show an intercorrelation of confining pressure with the initial condition of the Young’s modulus (E0), Poisson ratio ( υ0) and Shear modulus (G0) within small strain ranges. Furthermore, discrepancies between those parameters were also investigated. Experimental result confirmed the intercorrelation between cement content and confining pressure with a power function. In addition, higher cement ratios have discrepancies, conversely with low mixing ratios.

  • Prediction of ultimate lateral capacity of rigid spiral pile under static loading in cohesionless soil Reviewed International journal

    Amura Jugdernamjil, Noriyuki Yasufuku, Adel Alowaisy

    Lowland Technology International   23 ( 2 )   17 - 25   2021.12

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    1g model test is carried out to evaluate the ultimate lateral capacity of the spiral model pile in dense and medium dense cohesionless soil. The spiral model pile is scaled down using a proper similarity equation considering the equivalent second moment of area. The equivalent second moment of the area was obtained from a four-point bending test on a flat bar and compared with a spiral bar. In order to identify the lateral capacity of the spiral model pile, the conventional pipe and flat bar model piles were conducted as well. Winkler's model was adopted to predict the rigid spiral pile's ultimate lateral capacity in cohesionless soil. A simplified model is proposed by developing ultimate lateral soil pressure. The novel shape factor for spiral was obtained for the evaluation of ultimate lateral soil pressure by considering the projected area of the pile. The projected area of the spiral pile was compared with the pipe pile. The comparison study was conducted to spiral, flat, bar, and pipe pile, respectively, for inspecting accuracy. Among the comparison, the proposed model was indicated as a more accurate model than others. The spiral pile was shown a similar performance with a flat bar in both the empirical and the experimental results.

  • Optimizing modified triaxial testing for small strain zone using local displacement transducers and bender element for cement-treated soft soil Reviewed International coauthorship

    Muhammad Putera, Noriyuki Yasufuku, Adel Alowaisy, Ahmad Rifai

    Proc. of the International Conference on Disaster Mitigation and Management (ICDMM 2021)   331   03003   2021.12

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    DOI: https://doi.org/10.1051/e3sconf/202133103003

  • Novel sheet type sensor for measuring water content and its utilization in soil embankments Reviewed

    Ryota Araki, Ryohei Ishikura, Noriyuki Yasufuku, Adel Alowaisy, Sakon takahiro, Masatugu Uemmatu

    Proc. of the 第14回環境地盤工学シンポジウム   385 - 390   2021.9

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  • Applicability and Effectiveness of Sheet-Type Sensors in Locating the Slip Failure During Seepage Through Embankments Reviewed

    Ryota Araki, Ryohei Ishikura, Noriyuki Yasufuku, Adel Alowaisy, Takahiro Sakon & Masatsugu Uematsu

    2nd International Conference on Construction Resources for Environmentally Sustainable Technologies   49 - 59   2021.3

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    Recently, damages to river levees caused by torrential rains have increased dramatically. As the frequency of heavy rainfall events is expected to increase due to climate change, it is necessary to take adequate countermeasures to prevent damage to river embankments. Among several damage patterns to river embankments, the slip failures associated with water seepage are directly related to the variations in the degrees of saturation throughout the comprising soil profiles. As the seepage forces increase in linkage with the rise of the river water level, it is essential to monitor and predict the changes in the water content and displacement in the embankment to develop reliable solutions. Efficiently proposing countermeasures for such a problem requires monitoring and considering the changes in water content and shear strain within the embankment, where generally, the rise in river water level is associated with an increase in the seepage forces. Through this study, a sheet-type sensor to continuously measure the changes in water content, strain, and temperature, both horizontally and vertically, was developed and utilized to understand the mechanism and enhance the resiliency of levees. Furthermore, the sensor measurements are utilized to elaborate on the pre-failure indicators through a model experiment.

  • Evaluation of the soil water characteristics curve usig the CPM linked with the practical measurement of the soil shear strength Reviewed

    安福規之, アロウイシー アデル, 石藏良平, 畠山正則, 京野修

    地盤工学会誌 = Geotechnical engineering magazine : 土と基礎   69 ( 1 )   17 - 22   2021.1

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    Evaluation of the Soil Water Characteristics Curve using the Continuous Pressurization Method Linked with the Practical Measurement of the Soil Shear Strength

  • Lessons from Geo-Disasters Caused by Heavy Rainfall in Recent Years in Kyushu Island, Japan Reviewed

    Noriyuki Yasufuku, Adel Alowiasy

    Understanding and Reducing Landslide Disaster Risk, In Workshop on World Landslide Forum, Springer, Cham.   141 - 147   2020.11

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    DOI: 10.1007/978-3-030-60713-5_14

  • Shear strength characteristic of unsaturated undisturbed black volcanic ash soil in Kumamoto under static and cyclic loading Reviewed International journal

    Okri Putra, Noriyuki Yasufuku, Adel Alowaisy, Ryohei Ishikura, Ahmad Rifa'i, Yuko Kawaguchi

    Lowland Technology International   22 ( 2 )   279 - 289   2020.9

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    Black volcanic ash soil which is also known as Kuro-boku soil in Japan is a problematic type of soil. Kuro-boku is usually rich with allophane minerals, which are characterized by unique problematic properties. Through this paper, the shear strength and characteristics of the black volcanic ash soil collected at Kumamoto slope failure after earthquake 2016 were studied using three main approaches. The chemical composition of the black volcanic ash soil was investigated using the X-ray fluorescence analysis. Furthermore, the soil structure disturbance effect due to the earthquake shakes on the total shear strength was evaluated using a simple method that considers the pore size distribution that is reflected from the soil-water characteristic curve. In addition, the constant volume direct shear box considering static and cyclic tests were carried out. It was found that the main chemical content of the black volcanic ash soil is allophane which accounts for about 94%. Furthermore, the undisturbed samples exhibit a unimodal pore structure, and the disturbed showed a bimodal pore. Since the pore structure of the disturbed sample is unstable, the static shear strength tends to be lower and the degradation index value is higher than that of the undisturbed sample.

  • Measurement of unsaturated hydraulic characterestics for sandy soil utilizing the continuous pressurization method Reviewed

    安福規之, アロウイシー アデル, 石藏良平, 畠山正則, 京野修

    地盤工学会誌 = Geotechnical engineering magazine   68 ( 7 )   6 - 10   2020.7

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    Measurements of Unsaturated Hydraulic Characteristics for Sandy Soil utilizing the Continuous Pressurization Method

  • Effect of soil structure disturbance on the shear strength of black volcanic ash soil Reviewed

    Okri Putra, Noriyuki Yasufuku, Ryohei Ishikura, Ahmad Rifa’i, Adel Alowaisy, Yuko Kawaguchi

    E3S Web of Conferences   156   02004   2020.3

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    © 2020 The Authors, published by EDP Sciences. The effect of soil disturbance on the shear strength of black volcanic ash soil was investigated using a constant volume direct shear apparatus. Disturbance of soil structure was considered as the pore size distribution which obtained from the soil-water characteristic curve (SWCC). The disturbed sample was used as a representation of soil structure disturbance due to earthquake shakes. A series of cyclic tests were conducted under unsaturated and saturated samples. It was found that the undisturbed samples exhibit a unimodal pore structure, and the disturbed samples indicate to a bimodal pore structure. Since the pore structure of the disturbed sample is unstable, the degradation index value is higher than that of the undisturbed sample and increases with the increasing number of cycles. In other words, the cyclic normalized vertical stress of disturbed samples degrades faster. Furthermore, the degradation index value in the normallyconsolidated samples was found to be larger than the overconsolidated. It might be attributed to increasing of the pore water pressure during shearing. Where in the over-consolidated samples is lower than normally-consolidated. On the other hand, the normalized shear stress of unsaturated samples, it is slightly larger due to the suction forces in the total strength of soils.

    DOI: https://doi.org/10.1051/e3sconf/202015602004

  • Development of new suction controlled direct shear box apparatus for unsaturated soil. Reviewed

    Adel Alowiasy, Noriyuki Yasufuku, Ryohei Ishikura, Masanori Hatakeyama

    Technical Forum on Mitigation of Geo-disasters in Asia   P026   114 - 119   2019.11

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  • Evaluation of crushed Granulated Blast Furnace Slag – sand mixtures liquefaction characteristics under unified compaction energy Reviewed

    Shinya Nagata, Ryohei Ishikura, Noriyuki Yasufuku, Adel Alowaisy

    Technical Forum on Mitigation of Geo-disasters in Asia   P019   80 - 83   2019.11

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  • Discrepancies associated with adopting remolded samples when determining the retention characteristics of natural soil profiles. Reviewed

    Adel Alowaisy, Noriyuki Yasufuku, Ryohei Ishikura, Masanori Hatakeyama, Shuu Kyono

    Technical Forum on Mitigation of Geo-disasters in Asia   P016   64 - 69   2019.11

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  • Validation of the direct measurement of the soil water characteristics curve using the newly developed continuous pressurization method Reviewed

    Adel Alowiasy, Noriyuki Yasufuku, Ryohei Ishikura, Masanori Hatakeyama

    Proceedings of the 16th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering (16ARC)   2019.10

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  • Necessity of Measuring the Pore Water Pressure when Determining the SWCC Reviewed

    畠山正則, 京野修, 安福規之, 石藏良平, アロウイシー アデル

    地盤工学会誌 = Geotechnical engineering magazine : 土と基礎   67 ( 9 )   16 - 19   2019.9

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    Necessity of Measuring the Pore Water Pressure when Determining the SWCC

  • Soil water characteristics curves of insitu samples with low disturbance obtained from disaster slopes Reviewed

    安福規之, アロウイシー アデル, 石藏良平, 畠山正則, 京野修

    地盤工学会誌 = Geotechnical engineering magazine : 土と基礎   67 ( 9 )   24 - 27   2019.9

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    Soil Water Characteristics Curves of In-situ Samples with Low Disturbance Obtained from Disaster Slopes

  • Rapid concurrent measurement of the soil water characteristics curve and the hydraulic conductivity function utilizing the continuous pressurization method Reviewed

    Adel Alowaisy, Noriyuki Yasufuku, Ryohei Ishikura, Masanori Hatakeyama, Shuu Kyono

    Japanese Geotechnical Society Special Publication, Proceedings of 7th Asia-Pacific Conference on Unsaturated Soils   7 ( 2 )   366 - 375   2019.8

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    DOI: https://doi.org/10.3208/jgssp.v07.059

  • Pore water pressure profile development through soil water characteristics curve determination utilizing the continuous pressurization method Reviewed

    Hatakeyama, Shuu Kyono, Noriyuki Yasufuku, Ryohei Ishikura, Adel Alowaisy

    Japanese Geotechnical Society Special Publication, Proceedings of 7th Asia-Pacific Conference on Unsaturated Soils   7 ( 2 )   272 - 280   2019.8

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    DOI: https://doi.org/10.3208/jgssp.v07.043

  • Mechanical behaviour of unsaturated undisturbed black volcanic ash soil under static and cyclic loading Reviewed

    Okri Putra, Noriyuki Yasufuku, Ryohei Ishikura, Adel Alowaisy, Yuko Kawaguchi

    E3S Web of Conferences, 7th International Symposium on Deformation Characteristics of Geomaterials, IS-Glasgow 2019   92   pp.07004   2019.6   ISBN:9782759890644

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    The Authors, published by EDP Sciences. The mechanical behaviour of unsaturated undisturbed black volcanic ash soils was investigated using a constant volume direct shear apparatus. A series of static and cyclic tests were conducted under unsaturated and saturated samples. The cyclic test under two patterns were adopted. First type of pattern, cyclic one-sided shearing was applied. For the second type, two-sided shearing was conducted. For further understanding of the chemical content and microstructure, X-Ray Fluorescence analysis (XRF) and Scanning Electron Microscope (SEM) were evaluated. It was found that, under static shearing, the unsaturated sample exhibits a higher apparent cohesion and friction angle in comparison to the saturated sample. The normalized vertical stress under one-sided cyclic shearing in both overconsolidated and normally consolidated samples rapidly reduced at the beginning of shearing. This might be attributed to increase of the pore water pressure during shearing. Furthermore, there is a significant difference between the normalized shear stress under cyclic one-sided and two-sided shearing. For the two-sided cyclic shearing test, the normalized shear stress value is higher than the one-sided cyclic shearing test. In addition, the normalized shear stress under unsaturated condition is significantly larger. This can be related to the suction forces to the total strength of soils. The main chemical content of the black volcanic ash soil is allophane. Further, the microstructure of the black volcanic ash changes due to shearing. For the overconsolidated sample, particles of soil more severe damage than normally consolidated sample.

    DOI: https://doi.org/10.1051/e3sconf/20199207004

  • Novel rapid measurement system of undisturbed soils water characteristics curve utilizing the continuous pressurization method Reviewed

    Adel Alowaisy, Noriyuki Yasufuku, Ryohei Ishikura, Masanori Hatakeyama, Shuu Kyono

    E3S Web of Conferences, 7th International Symposium on Deformation Characteristics of Geomaterials, IS-Glasgow 2019   92   pp.07008   2019.6   ISBN:9782759890644

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    The Authors, published by EDP Sciences. Through this paper, a sampling methodology and a novel full automatic system adopting the continuous pressurization method which is capable of determining the Soil Water Characteristics Curve (SWCC) for both remoulded and undisturbed samples in a very short time were developed. The proposed system was validated by comparing the SWCCs of standard testing soils obtained using the developed system to the SWCCs obtained using a conventional method. Remoulded and undisturbed natural soil samples were tested, where the degree of disturbance influence on the obtained SWCC was discussed. In addition, the undisturbed samples containing moulds material influence on the obtained SWCC was investigated. It was found that remoulded samples do not properly represent the in-situ conditions with significant error that should be carefully considered when conducting analysis and proposing countermeasures against unsaturated soils related Geo-disasters. In addition, the material which the containing mould is made from has minor influence on the obtained SWCC which can be neglected. Finally, it can be concluded that the developed undisturbed soil water characteristics curve obtaining system is direct, rapid, reliable and simple. In addition, the proposed undisturbed sampling and testing methodology can be used to accurately evaluate the spatial variations of the SWCC regardless the heterogeneity of the soil profile.

    DOI: https://doi.org/10.1051/e3sconf/20199207008

  • Characteristics of the second stage of evaporation and water redistribution through double layered sandy soil profiles Reviewed International journal

    Adel Alowaisy, Noriyuki Yasufuku

    Lowland Technology International   20 ( 3 )   273 - 284   2018.12

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    Evaporation from porous media involves a complex pore scale water and vapor transportation that directly affects the liquid phase distribution and fluxes. The presence of textural contrast boundary in multilayered profiles adds to the complexity. This study aims at evaluating the textural contrast boundary depth and individual layer thickness influence on the actual evaporation and water storage through double-layered soil profiles. For coarse overlying fine sand, it was found that the top layer small capillaries contribute to the majority of water lost through the falling rate stage. Considering fine overlying coarse sand profiles, the pumping phenomenon from the bottom coarse layer to the top fine layer occurs before the arrival of the drying front to the textural boundary due to the increasing suction forces within the top fine layer. The water storage capability of double layered soil profiles depends highly on the top to the bottom small capillaries ratio multiplied by the layer thickness ratio. Regardless the atmospheric conditions and layering sequence, it was concluded that the shallower the textural contrast boundary results in decreasing the total duration required to achieve the residual evaporation stage thus leads to higher water storage capabilities through the first and second evaporation stages.

  • Mechanical and hydrological time-dependent properties of granulated blast furnace slag-sand mixture in soft ground improvement Reviewed International journal

    Tomomi Sakata, Noriyuki Yasufuku, Ryohei Ishikura, Adel Alowaisy

    Lowland Technology International   20 ( 3 )   285 - 296   2018.12

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    Every year about 20 million tons of Granulated Blast Furnace Slag (GBFS) are produced as a manufacturing byproduct. GBFS is mainly utilized in cement production accounting for 70% of the total utilized weight, while the geotechnical engineering applications accounts for 2%. Therefore, finding innovative utilization methods is a necessity. It was reported that the GBFS can be used as substitutive material in sand compaction pile (SCP) method. This study aims at evaluating the time-dependent mechanical, hydrological and chemical properties of the GBFS and the GBFS-sand mixtures. It was found that for early hydration stage, the hydrological and mechanical properties of the GBFS depends on the microstructure of the material, while the generation of the calcium silicate hydrate can be neglected. On the other hand, for longer curing time the influence of the calcium hydrate silicate generation becomes significant. Finally, it was concluded that mixing the GBFS with sand is a simple efficient way to control the time dependent mechanical, hydrological and chemical properties of the GBFS, however, the combined effect of the hydration reaction rate and the void ratio developments in response to the mixing ratio and the curing time should be properly considered to optimize utilizing the GBFS.

  • Rapid direct measurement of the soil water characteristics curve and hydraulic conductivity function utilizing the continuous pressurization method under the drying phase Reviewed

    A. Alowaisy, N. Yasufuku, R. Ishikura, Hatakeyama M

    Proc. of the Fourth Quadrennial International Symposium on Geo-Mechanics from Micro to Macro (IS-Atlanta 2018)   2018.9

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  • Optimizing Adaptations and Experimental Evaluation of the Actual Evaporation and Water Redistribution Through Double Layered Soil Profiles Reviewed

    Adel Alowaisy, Noriyuki Yasufuku

    The 8th Asian Joint Symposium on Geotechnical and Geoenvironmental Engineering (JS-Tainan 2016)   37 - 42   2016.11

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    Recently, desertification became one of the most global alarming environmental problems. As mentioned by the United Nations Convention to Combat Desertification UNCCD 2009, deserts and drylands form 41.2% of the total earth's land, where due to drought and desertification each year 12 million hectares are lost. In order to efficiently combat desertification, it is important understand the soil atmosphere interaction fluxes considering mainly the evaporation flux. A key element is to minimize the actual evaporation rate and maximize the water storage through soil profiles. Most of the existing studies that consider multilayered soil profiles focus on the evaporation flux from soil profiles without considering the effect of individual layer properties. The primary objective of this study is to identify the soil body properties influence on the actual evaporation flux and water redistribution through sandy soils. An experimental study considering individual layer dimensions, geotechnical properties and layering sequence for double layered soil profiles was carried out. The top to the bottom layer thickness ratio [Horizontal Textural Contrast Boundary], layer tihckness, top layer density and top layer median diameter were studied for coarse overlying fine sand profiles and fine overlying coarse sand profiles. It was found that providing soil cover that has different geotechnical properties from the underlying layer us a simple efficient way of maximizing the water storage through soil profiles. In addition, the results showed that the actual evaporation flux is highly dependent on the top to the bottom layer thickness ratio, individual layer thickness and top layer median diameter. While the top layer density has very weak influence that can be neglected.

  • Influence of Layer Thickness on Evaporation and Water Redistribution in Layered Soil Profiles Reviewed

    A. Alowaisy, N. Yasufuku

    Desert Technology Desert Technology 12th (DT 12) International Conference   2015.11

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    This study aims to evaluate the effect of the layer thickness on the evaporation rate and the water content redistribution through layered soil system without water table. In order to satisfy the aim, two experimental series were conducted where evaporation rate and water redistribution were continuously observed through the soil profile. It was found that the deeper the horizontal textural contrast boundary has the effect of increasing the amount of water lost by evaporation in addition to increasing the time needed to achieve residual evaporation rate stage (Stage III). Series A results showed that the deeper the horizontal textural contrast boundary has the effect of increasing the thickness of the severely desaturated zone [coarse sand top layer], while the bottom layer remained close to saturation [initial state]. Furthermore, the deeper the horizontal textural contrast boundary has the effect of increasing the thickness of the severely desaturated zone [coarse sand bottom layer], where during the falling evaporation rate stage [stage II], the top layer [fine sand] had higher water content than the bottom layer. The results illustrated the strong influence of the layer thickness on the evaporation rate and water redistribution through the evaporation process.

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Presentations

  • Progress and challenges in the experimental determination of unsaturated soils hydrological properties Invited

    ADEL ALOWAISY

    土木学会応用力学委員会  2022.1 

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    Event date: 2022.1

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Country:Japan  

  • Recent advancements in the measurement of unsaturated soils’ properties: One-sample testing Invited

    ADEL ALOWAISY

    地盤工学会九州支部  2023.2 

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    Event date: 2023.2

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Country:Japan  

  • モンゴル乾燥地における地表面蒸発を抑制するための覆土システムの最適化 Invited

    ADEL ALOWAISY

    日本沙漠学会 令和6年度秋季シンポジウム 第35回講演会  2024.10  Japan Arid Land Study Association

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    Event date: 2024.10

    Language:Japanese   Presentation type:Symposium, workshop panel (public)  

    Venue:Kyushu Univeristy, Nishijin PLaza   Country:Japan  

  • Towards a carbon-neutral and safer society: Research initiatives at the Geotechnical Engineering Laboratory, Kyushu University Invited International conference

    ADEL ALOWAISY

    International joint symposium JS-Surabaya 2024  2024.12  JGS-Kyushu branch

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    Event date: 2024.12

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Surabaya, Indonesia   Country:Indonesia  

  • Optimizing the efficiency of a soil cover system based on the pore structure characteristics and its applicability in arid regions Invited

    ADEL ALOWAISY

    日本沙漠学会  2023.5 

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    Event date: 2023.5

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Country:Japan  

MISC

  • 現地試験による小型インフィルトロメータを活かした斜面地盤における

    アロウイシー アデル,石蔵良平

    一般社団法人九州建設技術管理協会   2024.7

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  • Challenges and lessons learned from heavy rainfall-induced geo-disasters over the last decade in Kyushu island, Japan. Invited Reviewed

    In Progress in Landslide Research and Technology, Vol. 1, Issue 2, pp.123~132

    Springer International Publishing.   2023.1   ISBN:978-3-031-18471-0

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    Recently, heavy rainfall events have been inducing devastating geo-disasters, floods, sediments and debris flows in different regions around Japan, causing severe damage to lives and properties. According to the Intergovernmental Panel on Climate Change (IPCC), the frequency and intensity of localized torrential rainfall events are expected to increase. This study initially highlights the increasing geo-disaster-inducing forces in relation to the deterioration of the social infrastructure and the decline in the labor forces in Japan. Furthermore, several geo-disasters within Kyushu Island, Japan, which seem to occur repeatedly, were analyzed considering the prevailed conditions and the adopted mitigation and prevention protocols. Consequently, the necessity for developing innovative systems and techniques that integrate the academic disciplines in collaboration with the residents and the government was evidently asserted. Moreover, the recent progress in establishing comprehensive geo-hazard vulnerability assessment methods and techniques that consider the regional characteristics, mainly Kyushu and Hokkaido islands, was introduced.

    DOI: https://doi.org/10.1007/978-3-031-18471-0_10

  • Kyushu branch from international student's point of view Invited Reviewed

    アロウイシー アデル, 大山エンリッケ

    "地盤工学会誌 Journal of Geotechnical Engineering   70 ( 6 )   32 - 34   2022.6

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  • 令和2年7月九州豪雨災害の総合調査・研究報告書(代表:大本照憲(熊本大学))、被災河川堤防堤体土の水分特性の評価とその適用(分担執筆)

    科学研究費助成事業(特別研究推進費) 、研究代表者 大本照憲(熊本大学)

    2021.7

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  • 平成30 年 4 月中津市耶馬渓町金吉梶ケ原地区における斜面崩壊と今後の問題点

    平成29 年 7 月九州北部豪雨地盤災害調査団 先遣隊調査メンバー

    (公益社団法人)地盤工学会   2018.7

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Committee Memberships

  • 地盤工学会九州支部 国際委員会   副査   Domestic

    2024.4 - 2026.3   

  • 地盤工学会「Geo-Mechanics from Micro to Macro 国内委員会」   部会員   Domestic

    2024.2   

  • 地盤工学会九州支部 国際委員会/Working Group leader 「若手地盤工学セミナー in 九州」   Working Group leader   Domestic

    2022.6   

  • 地盤工学会九州支部   部会員/幹事   Domestic

    2022.6   

Academic Activities

  • Session Chair

    Role(s): Panel moderator, session chair, etc.

    2025 Japan Society of Civil Engineers West Branch Annual Meeting  ( Japan ) 2025.3

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    Type:Competition, symposium, etc. 

  • Session Chair

    Role(s): Panel moderator, session chair, etc.

    International Joint Symposium Surabaya Indonesia 2024 (JS-Surabaya)  ( Japan ) 2024.12

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    Type:Competition, symposium, etc. 

  • Session Chair

    Role(s): Panel moderator, session chair, etc.

    2024 Japan Society of Civil Engineers West Branch Annual Meeting  ( Japan ) 2024.3

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    Type:Competition, symposium, etc. 

  • Session Chair and Moderator

    Role(s): Panel moderator, session chair, etc.

    The 1st Young Geotechnical Seminar in Kyushu  ( Japan ) 2018.11

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    Type:Academic society, research group, etc. 

  • Screening of academic papers

    Role(s): Peer review

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    Type:Peer review 

    Proceedings of International Conference Number of peer-reviewed papers:2

Research Projects

  • Research Project on Sustainable Desertification Preve_ntion with Local Residents in Mongolia

    2024.4 - 2029.3

    International Joint research

    Kiyoshi Omine, Adel Alowaisy, Atsushi Marui, Zentaro Furukawa, Indree Tuvsintogtokh

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    Authorship:Coinvestigator(s) 

  • モンゴル砂漠化進行地域における自然再興型グリーンインフラ技術の開発と社会実装

    2024.4 - 2028.3

    科学研究費助成事業  共同研究

    丸居篤、大嶺聖、古川全太郎、矢田谷健一、アロウイシーアデル

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    Authorship:Coinvestigator(s)  Grant type:Competitive funding other than Grants-in-Aid for Scientific Research

  • 排水・吸水過程における不飽和土のせん断強度ヒステリシスの評価に関する研究

    2024.4 - 2025.3

    一般社団法人 環境地盤工学研究所  研究助成

    Alowaisy Adel

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    Authorship:Principal investigator  Grant type:Donation

  • 現地試験による小型インフィルトロメータを活かした斜面地盤における不飽和浸透特性の予測法の提案

    2024.4 - 2025.3

    一般社団法人九州建設技術管理協会  研究助成

    Alowaisy Adel、Ishikura Ryohei

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    Authorship:Principal investigator  Grant type:Donation

  • 水分・ひずみ・温度センサー等を活用した堤体内部の可視化及びこれらセンサーを用いた堤体崩壊モードの検証実験と実用化検証

    2023.6 - 2026.3

    東洋アルミエコープロダクツ株式会社  Joint research

    Ishikura Ryohei, Alowaisy Adel

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    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid)  Grant type:Joint research

  • 回転式破砕混合工法における改良土品質に影響を与える影響因子の分析

    2022.10 - 2024.3

    JDC Corporation 

    Yasufuku Noriyuki

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    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid)  Grant type:Joint research

  • 革新的カーボンネガティブコンクリートの材料・施工および利用技術の開発

    2022.4 - 2027.3

    株式会社竹中工務店 (Japan) 「グリーンイノベーション基金事業」  Joint research

    Ishikura Ryohei, Alowaisy Adel

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    Authorship:Coinvestigator(s)  Grant type:Joint research

  • 水分・ひずみ・温度センサー等を活用した堤 体内部の可視化及びこれらセンサーを用いた堤体崩壊モードの検証実験と実用化検証

    2020.8 - 2023.3

    東洋アルミニウム株式会社  Joint research

    安福規之、石藏良平、アロウイシーアデル

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    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid)  Grant type:Joint research

  • 不良土の再生利用を目的とした破砕混合技術の 利用範囲拡大のための改良に関わる研究

    2020.1 - 2022.5

    JDC Corporation 

    Yasufuku Noriyuki

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    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid)  Grant type:Joint research

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Educational Activities

  • We believe that to cope with the challenges of this era, fostering geotechnical engineers equipped not only with fundamental knowledge but also with the communication skills enabling them to play active roles in the community is essential. Accordingly, we hold regular seminars covering various topics, including "Fundamentals of Soil Mechanics" and "Unsaturated Soils Mechanics," to educate students on the fundamentals necessary for creating basic knowledge and developing novel testing/assessment techniques for various geotechnical applications. Besides, we focus on communication and Presentation skills in English and Japanese, aiming to nurture a generation capable of competing internationally and having the confidence to express their ideas openly. Moreover, we encourage international collaborations, including hosting international researchers and students, and offer them the opportunity to engage with the civil engineering field in Japan in a mutually beneficial way.

Class subject

  • 土木実践教室A

    2022.10   Second semester

  • 土木実践教室B

    2022.10   Second semester

  • Civil and Environmental Engineering Laboratory Work A

    2022.10   Second semester

  • Civil and Environmental Engineering Laboratory Work B

    2022.10   First semester

  • Civil and Environmental Engineering Practice「基礎土木工学演習問題・解答」

    2023.10   Second semester

  • Civil and Environmental Eng Laboratory Work A

    2022.10 - 2023.3   First semester

  • Civil and Environmental Eng Laboratory Work B

    2022.4 - 2022.9   First semester

  • 土木実践教室1

    2022.10 - 2023.3   First semester

  • 土木実践教室2

    2022.10 - 2023.3   First semester

  • 土木実践教室3

    2022.4 - 2022.9   First semester

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FD Participation

  • 2024.4   Role:Participation   Title:令和4年度 第1回全学FD(新任教員の研修)The 1st All-University FD (training for new faculty members) in FY2022

    Organizer:University-wide

  • 2022.4   Role:Participation   Title:令和4年度 第1回全学FD(新任教員の研修)The 1st All-University FD (training for new faculty members) in FY2022

    Organizer:University-wide

Teaching Student Awards

  • 令和2 年度地盤工学会九州支部 学生賞 優良学生賞

    Year and month of award:2021.3

    Classification of award-winning students:Undergraduate student   Name of award-winning student:相良知輝

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  • 令和3 年度地盤工学会九州支部 学生賞 優良学生賞

    Year and month of award:2022.4

    Classification of award-winning students:Postgraduate student   Name of award-winning student:Jumana G. N. Hussary

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  • 令和2年度土木学会西部支部研究発表会 優秀講演者

    Year and month of award:2021.3

    Classification of award-winning students:Postgraduate student   Name of award-winning student:Jumana G. N. Hussary

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  • 第56回地盤工学研究発表会 優秀論文発表者賞

    Year and month of award:2021.7

    Classification of award-winning students:Postgraduate student   Name of award-winning student:Jumana G. N. Hussary

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  • 令和3年度土木学会西部支部研究発表会 優秀講演者

    Year and month of award:2022.3

    Classification of award-winning students:Postgraduate student   Name of award-winning student:Jumana G. N. Hussary

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  • 令和4年度土木学会西部支部研究発表会 優秀講演者

    Year and month of award:2023.3

    Classification of award-winning students:Undergraduate student   Name of award-winning student:峰渉磨

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  • 第58回地盤工学研究発表会 優秀論文発表者賞

    Year and month of award:2023.7

    Classification of award-winning students:Postgraduate student   Name of award-winning student:Jumana G. N. Hussary

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  • 令和4 年度地盤工学会九州支部 学生賞 優良学生賞

    Year and month of award:2023.4

    Classification of award-winning students:Postgraduate student   Name of award-winning student:小川誠

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  • 令和5 年度地盤工学会九州支部 学生賞 優良学生賞

    Year and month of award:2024.4

    Classification of award-winning students:Postgraduate student   Name of award-winning student:簗瀬太陽

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  • 令和6 年度地盤工学会九州支部 学生賞 優良学生賞

    Year and month of award:2025.4

    Classification of award-winning students:Postgraduate student   Name of award-winning student:甲斐柊吾

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  • 令和5年度土木学会西部支部研究発表会 優良学生賞

    Year and month of award:2024.3

    Classification of award-winning students:Postgraduate student   Name of award-winning student:簗瀬太陽

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  • 令和5年度土木学会西部支部研究発表会 優良学生賞

    Year and month of award:2025.3

    Classification of award-winning students:Postgraduate student   Name of award-winning student:甲斐柊吾

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  • 令和5年度土木学会西部支部研究発表会 優良学生賞

    Year and month of award:2025.3

    Classification of award-winning students:Postgraduate student   Name of award-winning student:パーカー舞椰

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Travel Abroad

  • 2019.10

    Staying countory name 1:Taiwan, Province of China   Staying institution name 1:Taipei International Convention Center (TICC)

  • 2019.7

    Staying countory name 1:United Kingdom   Staying institution name 1:Dundee univeristy

  • 2019.6

    Staying countory name 1:United Kingdom   Staying institution name 1:Strathclyde's Technology & Innovation Centre

  • 2018.9

    Staying countory name 1:United States   Staying institution name 1:Georgia Institute of Technology

  • 2016.11

    Staying countory name 1:Taiwan, Province of China   Staying institution name 1:National Cheng Kung University

  • 2015.11

    Staying countory name 1:Egypt   Staying institution name 1:Cairo University

  • 2014.12

    Staying countory name 1:Indonesia   Staying institution name 1:Institut Teknologi Sepuluh Nopember (ITS)

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