A5063039028- Soil and Unsaturated Flow
- Landslides and related hazards
- Geotechnical Engineering and Soil Stabilization
- Geotechnical Engineering and Soil Mechanics
- Soil erosion and sediment transport
- Dam Engineering and Safety
- Photonic and Optical Devices
- Agriculture, Soil, Plant Science
- Semiconductor Lasers and Optical Devices
- Advanced Photonic Communication Systems
- Railway Engineering and Dynamics
- Mechanical stress and fatigue analysis
- Geotechnical Engineering and Underground Structures
- Microwave Engineering and Waveguides
- Aeolian processes and effects
- Liver physiology and pathology
- Fatigue and fracture mechanics
- Forest, Soil, and Plant Ecology in China
- Soil Mechanics and Vehicle Dynamics
- Granular flow and fluidized beds
- Pluripotent Stem Cells Research
- Energy, Environment, Agriculture Analysis
- Geotechnical and construction materials studies
- Tree Root and Stability Studies
- Soil Moisture and Remote Sensing
National Institute of Technology, Tokuyama College
2024
Takeda (Japan)
2024
Tokuyama (Japan)
2024
Kōchi University
2023
University of Yamanashi
2015-2017
Kagoshima University
2011
Kyushu University
2011
Kagoshima Prefectural College
2011
Ritsumeikan University
2011
Osaka City University
2008-2009
Abstract The induction of tissue-specific vessels in vitro living tissue systems remains challenging. Here, we directly differentiated human pluripotent stem cells into CD32b + putative liver sinusoidal progenitors (iLSEP) by dictating developmental pathways. By devising an inverted multilayered air-liquid interface (IMALI) culture, hepatic endoderm, septum mesenchyme, arterial and quadruple self-organized to generate sustain hepatocyte-like neighbored divergent endothelial subsets composed...
As the climate begins changing due to global warming, heavy rainfalls have become more frequent. These are, in turn, increasing red soil runoff that has increasingly damaged marine products and tourist industries. Over 85% of all such is from farmland. Working with local farmers, we conducted field experiments Ginoza Village Okinawa’s Matsuda district better understand inhibitory effects on different potential adaptation measures. Effectiveness methods are discussed based obtained results....
Postamplifier and p-i-n/preamplifier modules suitable for 40-Gb/s short-haul long-haul optical communication systems are presented. The postamplifier module consists of two stages pseudomorphic high-electron mobility transistor (PHEMT) GaAs amplifiers mounted in a housing. A test fixture is used to provide bias supplies that control the output signal. has 20-dB gain 4.5-dB noise figure. input voltage swing can be varied from 10 148 mV p-p while providing an open eye-pattern response over...
The relationship between suction and water content in an unsaturated soil is called the soil-water characteristic curve (SWCC). SWCC of soils hysteretic nature. In this paper, a numerical model for hysteresis proposed to simulate main scanning curves based on KITA-ARA KITA-SAKO which degrees saturation under quasi-saturated residual saturated conditions can be taken account of. derived from compaction tests addition index properties such as particle density, void ratio, grain size...
Waveguide-integrated pin photodiodes (WGpinPDs) planar-embedded by a semi-insulating (SI) InP buried layer exhibit very stable dark current characteristics after aging tests for over 8000 h at 175°C with bias voltage of −10 V. A wear-out failure rate much less than 1 in time (FIT) 25 years operation 40°C was primarily estimated. Stable 5000 were also confirmed under high power optical input test an atmosphere temperature 85°C. For the receiver module using WGpinPD and GaAs pHEMT travelling...
不飽和土は三相混合体である.すなわち,土粒子実質部分(固相),間隙空気(気相),間隙水(液相)から成り立っている.本論文では,単位体積当たりの粒子数,単位体積当たりの接点数,単位面積当たりの接点数,1粒子当たりの接点数を基本物理量として粒子間力,粒子間応力を誘導し,不飽和土の保水・透気・透水・圧縮・せん断挙動を体系的に解析するための新しい不飽和土質力学の体系化を試みている.間隙水,間隙空気の挙動については,基本粒状体モデル(elementary particulates model)を提案し,統計・確率論的な考察から水分特性曲線,透水係数,透気係数を導いている.土粒子骨格構造の挙動については,粒子接点での接点角の連続的な変化にマルコフ過程,不連続な変化に消滅・発生率を適用し,粒子間応力とひずみの関係を導いている.
Particulate material such as sandy soil is an assembly of particles that composed (solid), water (liquid) and air (gas) in voids, i.e., a multi-phase material. Kitamura (1981) proposed numerical model for particulate based on the mechanical probabilistic consideration particle scale. In contact angle was adopted random variable. The Markov process applied to express continuous change deformation process. On other hand parameters estimate discontinuous behavior disappearance & appearance...
近年，地下水位が深い位置にある不飽和埋め戻し地盤において，飽和地盤の挙動とは異なる沈下が生じ，度々報告されている．地震動による不飽和地盤の沈下に関しては研究・報告が少なく，メカニズムも解明されていない．本研究では不飽和状態の模型地盤を作製し，振動台を用いて加速度を与え，加振前と加振後の沈下量，飽和度，乾燥密度の関係を求めている．その結果，不飽和地盤の破壊形態にクラックが生じるケースと地表面に流出水が生じるケースを確認した．そして，二つの破壊形態が分かれる条件について，境界値となる飽和度の存在を示唆している．加えてその飽和度は締固め試験や水平浸潤試験から導かれる飽和度と近い値を示すことを考察している．
In this investigation, the on-line and off-line hybrid contact algorithm for modeling wheel/rail problems is developed based on elastic formulation. tabular search used in existing specialized railroad vehicle dynamics codes, points are predicted using an assumption of rigid contacts. For reason, can be different from those by The difference point becomes significant when flange contacts that have large angles considered. effectively tread switched to jumped region. By so doing, a...
We propose a novel adaptive linearization technique for balanced-amplifier array. The uses the specific intermodulation distortions (IMDs) at output ports in detected IMD power level can be used to optimize linearizer's characteristics. Because design does not need as many detectors and carrier cancel loops it amplifiers, we were able successfully miniaturize array-antenna system. This paper describes principles, verified both experimentally mathematically 4-port amplifier
A side-illuminated waveguide integrated PIN photodiode (WG PD) has been developed and modeled for use in 40 Gb/s PIN/preamp receiver module. The WG PD exhibited a wide bandwidth over GHz with high responsivity. For the modules GaAs pHEMT traveling wave amplifier (TWA), clear eye-opening was observed recorded minimum received power of -11.2 dBm at obtained first time.
2013年3月,富士山麓から5合目に続く山梨県営林道滝沢線(以下,滝沢林道)の標高1950mの地点でアスファルト舗装の路面が約300mにわたって大きく陥没しているのが発見され,メディア等で大きく取り上げられた.一方,2013年6月22日,富士山は関連する文化財群とともに「富士山-信仰の対象と芸術の源泉」の名で世界文化遺産に登録されている.滝沢林道陥没の要因を明らかにし,今後の維持管理に知見を加えることが求められている.本研究では滝沢林道陥没を発生させた要因について,気象や現地調査を基に地形の影響を考察している.その結果,2013年3月18日の夕方から19日未明にかけての降雨と同時に起こった急激な気温上昇,陥没地点上部の沢からの水の供給が要因に考えられることを述べている.
It is essential for residents to understand ground disaster and improve prevention awareness, because natural disasters have occurred frequently in recent years. In this study, nondestructive unsaturated seepage behavior was continuously visualized by using MRI (magnetic resonance imaging) with test equipment constructed of non-metal parts. Additionally, the water content soil from image evaluated, results previous experiments were considered compared. The study revealed imaging that will...
排気排水条件下において繰返しせん断を受ける不飽和砂質土の体積ひずみを応力制御方式による中空ねじり繰返しせん断試験から求めた．乾燥密度及び含水比を変化させた幾つかのケースを実施した結果から，乾燥密度が小さいほど体積ひずみが大きくなること，含水比が大きいほど体積ひずみが大きくなること，これら物理特性の変動による体積ひずみの変化率はせん断応力比に応じて異なること，がわかった．乾燥密度及び含水比のばらつきを考慮した地震時地盤沈下量推定に関する信頼性解析（モンテカルロシミュレーション）を実施し，地震時地盤沈下量の損傷度曲線を算出した結果，大きな沈下量を想定した損傷度曲線ほどばらつきが大きくなることを示した．
地球温暖化等の気候変動に伴う大雨の頻度増加が指摘されるようになり,各種産業への影響等が懸念されている.特に沖縄県では,亜熱帯特有の高温多雨気候により,赤土等流出を受けやすく,農地や開発事業地等から流出する赤土等は1950年代頃から問題化しているが,未だ解決に至っていない.さらに,沖縄のみならず亜熱帯化が懸念される九州もまた浸食を受けやすい土壌を有している. 本研究では,亜熱帯地域である沖縄県国頭郡宜野座村の農地で赤土等流出実験環境を整備し,1年強行ってきた様々の適応策の赤土等流出抑制効果把握のための現地実験結果を考察している.また,農家が実施可能な適応策を選定し,その狙い等について述べている.
Kitamura et al. have proposed the numerical models to establish unsaturated soil mechanics aided by probability theory and statistics, apply geo-simulator, where model for thermodynamical behaviors of are essential. In this paper thermodynamics is introduced investigate heat transfer through evaporation pore water in based on first second laws thermodynamics, i.e., conservation energy, increasing entropy. On other hand lysimeter equipment used obtain data during fine days seepage rain rainy...