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Erosion and runoff reduction potential of vetiver grass for hill slopes:A physical model study

International Journal of Sediment Research 2023年第1期38卷 49-65页

作者： Shamontee Aziz Mohammad Shariful Islam BUET-Japan Institute of Disaster Prevention and Urban Safety (BUET-JIDPUS) Bangladesh University of Engineering and Technology (BUET) department of Civil Engineering Bangladesh University of Engineering and Technology (BUET)

Severe erosion is caused by intense rainfall in tropical regions. The erodible soil of steep hill slopes,accompanied by destruction of vegetation due to human interventions results in accelerated erosion. A sustainable and cost-effective solution such as vetiver grass(Chrysopogon zizanioides) is, thus, required to control the erosion process. In the current study, 6 small-scale glass models: 1 bare and 5 with vetiver grass, having a slope angle of 37°have been constructed. One year after planting, artificial rainfall of extremely high intensity was applied to all 6 small models and the role of vetiver canopy and roots in erosion and runoff control was observed. To see the effect of soil texture, one among these 5 models was made with silty sand and others contained sandy silt. The results demonstrated that, for sandy silt, the inclusion of vetiver reduced the soil loss by 94%-97%, and soil detachment rates were lowered by 95%.The average runoff also was reduced by 21%. The canopy cover showed a positive impact on reducing both quantities. An increase in average root diameter from 1.6 to 2.5 mm increases the soil loss due to its negative impact on added cohesion. The added cohesion showed a linearly negative correlation with soil loss. A composite system of vetiver and jute geotextile was most effective in erosion reduction among 4vegetated models with sandy silt. Under same vetiver planting layout, the grass covered model of silty sand yielded 84% lower erosion and 62.5% lower runoff than the grass covered one with sandy silt. Thus,vetiver was more effective in erosion and runoff reduction for soil with a greater percentage of sand, and soil type dominated the erosion process.

关键词： Erosion Small-scale model experiments surface runoff Artificial rainfall Vetiver

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Unusual Behavior of Intestinal Spirochetosis: A Case Report

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Infectious Diseases & Immunity 2023年第3期3卷 142-143页

作者： Carlo Petruzzellis Federico Catino Gastroenterology Unit ARNAS Garibaldi HospitalCataniaItaly Gastroenterology and Endoscopy department Fondazione Poliambulanza HospitalBresciaItaly

Human intestinal spirochetosis is a rare clinicopathological condition characterized by the presence of spirochetal microorganisms on the surface of the colorectal mucosa and,in some cases,by their invasion into the lamina *** most frequent cause of this infection is immunocompromised *** case report describes a patient with relevant symptoms and endoscopic alterations,but limited invasion by spirochetes,as shown by histological analysis of ileal and colonic *** histological examination,metronidazole was *** resulted in rapid and complete resolution of the symptoms,which demonstrated an infectious *** peculiarity of our case is that the clinical and endoscopic appearances were typical of the aggressive behavior of the disease,but histological samples showed only superficial colonization of the colonic epithelium without clear invasion of deeper *** case report emphasizes that the virulence of spirochetes is not strictly related to intestinal mucosal invasion.

关键词： Case reports Intestinal spirochetosis Colitis Histological sample

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Upper embedability of graphs

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Science China Mathematics 1998年第5期41卷 498-504页

作者：黄元秋刘彦佩 department of Mathematics Normal University of Hunan Changsha China department of Mathematics Northern Jiaotong University Beijing China

A connected loopless graph that can be embedded on some (orientable or nonorientable) surface such that the size of each face does not exceed 5 is upper embeddable.

关键词： graph face maximum genus upper embeddable.

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基于嫦娥五号月球样品的月壤残余内摩擦角预测

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Science Bulletin 2023年第7期68卷 730-739页

作者：聂家岩崔一飞 Kostas Senetakis 郭丹王瑜王国栋冯鹏贺怀宇张徐航张小平李存惠郑虎胡伟牛富俊刘权兴李安原 State Key Laboratory of Hydroscience and Engineering Tsinghua UniversityBeijing 100084China School of Civil Engineering Wuhan UniversityWuhan 430072China department of Architecture and Civil Engineering City University of Hong KongHong Kong 999077China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Key Laboratory of Mountain Hazards and surface Process Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China department of Civil Engineering Tsinghua UniversityBeijing 100084China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyMacao 999078China Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of PhysicsLanzhou 730000China department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China South China Institute of Geotechnical Engineering South China University of TechnologyGuangzhou 510641China School of Mathematical Sciences Shanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province Shaoxing UniversityShaoxing 312000China

随着人类探月工程的快速发展,月球基地建设以及月表资源开发利用有望更快实现,合理预测月壤工程力学性质对于未来深层次探月工程意义重大,我国嫦娥五号返回月球样品为研究月壤工程力学特性提供了直接的实测材料。然而,月球样品极其珍贵... 详细信息

随着人类探月工程的快速发展,月球基地建设以及月表资源开发利用有望更快实现,合理预测月壤工程力学性质对于未来深层次探月工程意义重大,我国嫦娥五号返回月球样品为研究月壤工程力学特性提供了直接的实测材料。然而,月球样品极其珍贵,难以满足传统土工试验测试.为了应对这一科学挑战,本研究从无损分析月球样品颗粒属性入手,使用高精度X-射线μCT扫描、三维白光干涉、原子力显微镜等无损测试手段,分析了不同类型月壤颗粒的三维多尺度形态、弹性力学和摩擦属性等指标.在此基础上,基于颗粒材料宏微观物理力学理论和数值模型尝试预测了嫦娥五号采样处月壤残余内摩擦角。本研究为基于月球样品信息跨尺度分析月壤工程力学性质提供了可行思路。

关键词： Chang’e-5 lunar samples Geometry Mechanics Tribology Residual friction angle Cross-scale prediction

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Erianin suppresses constitutive activation of MAPK signaling pathway by inhibition of CRAF and MEK1/2

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Signal Transduction and Targeted Therapy 2023年第4期8卷 1874-1888页

作者： Penglei Wang Xuechao Jia Bingbing Lu Han Huang Jialin Liu Xuejiao Liu Qiong Wu Yamei Hu Pan Li Huifang Wei Tingting Liu Dengyun Zhao Lingwei Zhang Xueli Tian Yanan Jiang Yan Qiao Wenna Nie Xinli Ma Ruihua Bai Cong Peng Zigang Dong Kangdong Liu department of Pathophysiology Basic Medicine Research CenterSchool of Basic Medical SciencesAMSZhengzhou University450000 ZhengzhouChina China-US(Henan)Hormel Cancer Institute 450000 ZhengzhouChina The department of Pathology Affiliated Cancer Hospital of Zhengzhou University450000 ZhengzhouChina The department of Dermatology Xiangya HospitalCentral South University410078 ChangshaChina The Collaborative Innovation Center of Henan Province for Cancer Chemoprevention 450000 ZhengzhouChina State Key Laboratory of Esophageal Cancer Prevention and Treatment Zhengzhou University450000 ZhengzhouChina Provincial Cooperative Innovation Center for Cancer Chemoprevention Zhengzhou UniversityZhengzhouChina

Constitutive activation of RAS-RAF-MEK-ERK signaling pathway(MAPK pathway)frequently occurs in many cancers harboring RAS or RAF oncogenic *** of the paradoxical activation induced by a single use of BRAF or MEK inhibitors,dual-target RAF and MEK treatment is thought to be a promising *** this work,we evaluated erianin is a novel inhibitor of CRAF and MEK1/2 kinases,thus suppressing constitutive activation of the MAPK signaling pathway induced by BRAF V600E or RAS *** enzyme profiling,surface plasmon resonance(SPR),isothermal titration calorimetry(ITC),cellular thermal shift assay,computational docking,and molecular dynamics simulations were utilized to screen and identify erianin binding to CRAF and MEK1/*** assay,luminescent ADP detection assay,and enzyme kinetics assay were investigated to identify the efficiency of erianin in CRAF and MEK1/2 kinase ***,erianin suppressed BRAF V600E or RAS mutant melanoma and colorectal cancer cell by inhibiting MEK1/2 and CRAF but not BRAF kinase ***,erianin attenuated melanoma and colorectal cancer in ***,we provide a promising leading compound for BRAF V600E or RAS mutant melanoma and colorectal cancer through dual targeting of CRAF and MEK1/2.

关键词： MEK1/2 BRAF activation

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Environmental Isotopic Characterization of Groundwater and surface Water in Northeast Missan Province,South Iraq

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Acta Geologica Sinica(English Edition) 2014年第4期88卷 1227-1238页

作者： Hussein Badr GHALIB Ali Riza SGüT Selcuk University college of EngineeringGeology DepartmentSelcukTurkey Basrah University Geology DepartmentBasrahIraq

The present work studies the environmental isotopes assess groundwater characteristics of the different parts of the main aquifer in the northeast Missan Province in south of Iraq. Water samples of groundwater and surface water were collected for two dry and wet seasons during the water year of 2011-2012. The study shows that most of the groundwater in the aquifer falls above the global meteoric water line, and all the samples fall below the Mediterranean meteoric water line, indicating that these samples are a mixture of two water types. The tritium content of these samples supports this conclusion. The overall conclusion of this study indicates that there are two sources of groundwater recharge in the studied area： the ephemeral streams （Teeb and Dewerge） and major precipitation sources. According to the tritium levels at or below one tritium unit （TU） obtained from the water, supply wells are highly confined or ＂not vulnerable＂. Overall, the 3^H results imply that recent recharge has taken place during the last four to five decades. In the recharge area, the high tritium content in the southern part of the Teeb area suggests that the recharge originates from rapid infiltration of surface runoff. Therefore, the groundwater resources in the study area should be protected from contamination, because it will influence the aquifer in a relatively short period of time if any contamination enters the recharge areas of the aquifer.

关键词： Groundwater recharge Tritium environmental isotope meteoric water line Iraq

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A neural network-based electromyography motion classifier for upper limb activities

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Journal of Innovative Optical Health Sciences 2016年第6期9卷 77-84页

作者： Karan Veer Tanu Sharma Ravinder Agarwal Electrical and Instrumentation Engineering department Thapar University Computer Science Engineering department GCET Ropar 174001India

The objective of the work is to investigate the classifcation of different movements based on the surface electromyogram(SEMG)pattern recognition *** testing was conducted for four arm movements using several experiments with artificial neural network class fication *** time domain features were extracted and consequently dlassification was implemented using back propagation neural dassifier(BPNC).Further,the realization of projected network was verified using cross validation(CV)process;hence ANOVA algorithm was carried *** of the network is analyzed by considering mean square error(MSE)value.A comparison was performed between the extracted feat ures and back propagation network results reported in the *** concurrent result indicates the significance of proposed network with classification accuracy(CA)of 100%recorded from two channels,while analysis of variance technique helps in investigating the effectiveness of classified sigmal for recognition tasks.

关键词： ANN SEMG arm recognition statistics classification RMS upper arm activities

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Theoretical Study on the Gas Phase Reaction of Au^+ with CS_2

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Chinese Journal of Structural Chemistry 2010年第9期29卷 1347-1352页

作者：李涛洪余仕问刘祥义谢小光 Faculty of Chemistry Southwest Forestry College department of Chemistry Qujing Normal University department of Chemistry Yunnan University

The reaction of Au＋（1S,3D） with CS2 has been investigated at the B3LYP and CCSD（T） levels of *** identified reaction pathways revealed that the experimentally observed products,AuS＋ and AuCS＋,can be produced by the insertion of Au＋ into C-S *** calculated energetics shows that the reactions on singlet surface lead to excited-state products,AuS＋（1Σ）＋ 1CS and AuCS＋（1Σ）＋ 1S,and have notable energy barriers,whereas the reactions on triplet surface producing the ground state products of AuS＋（3Σ）＋ 1CS and AuCS＋（1Σ）＋ 3S are energetically much more *** result suggests that the minor formations of AuS＋ and AuCS＋ observed in the previous experiment under room-temperature condition should result from the reactions of excited-state Au＋（3D） with ***,the possibility for singlet-triplet surface crossing was also discussed by approximately determining the crossing region.

关键词： gold cation carbon disulfide insertion theoretical study

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Effect of equal-channel angular pressing on pitting corrosion resistance of anodized aluminum-copper alloy

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中国有色金属学会会刊：英文版 2009年第4期19卷 904-908页

作者： In-Joon SON Hiroaki NAKANO Satoshi OUE Shigeo KOBAYASHI Hisaaki FUKUSHIMA Zenji HORITA department of Materials Process Engineering Graduate School of EngineeringKyushu University department of Materials Science and Engineering Faculty of EngineeringKyushu University department of Applied Chemistry and Biochemistry Faculty of EngineeringKyushu Sangyo University

The effect of equal-channel angular pressing(ECAP) on the pitting corrosion resistance of anodized Al-Cu alloy was investigated by electrochemical techniques in a solution containing 0.2 mol/L AlCl3 and also by surface *** was conducted for 20 min at 200 and 400 A/m2 in a solution containing 1.53 mol/L H2SO4 and 0.018 5 mol/L Al2(SO4)3·16H2O at 20 ℃.Anodized Al-Cu alloy was immediately dipped in boiling water for 20 min to seal the micro pores present in anodic oxide *** time required before initiating pitting corrosion of anodized Al-Cu alloy is longer with ECAP than without,indicating that ECAP process improves the pitting corrosion resistance of anodized Al-Cu *** phase precipitates such as Si,Al-Cu-Mg and Al-Cu-Si-Fe-Mn intermetallic compounds are present in Al-Cu alloy and the size of these precipitates is greatly decreased by application of ***-Cu-Mg intermetallic compounds are dissolved during anodization,whereas the precipitates composed of Si and Al-Cu-Si-Fe-Mn remain in anodic oxide films due to their more noble corrosion potential than ***-SEM and EPMA observation reveal that the pitting corrosion of anodized Al-Cu alloy occurs preferentially around Al-Cu-Si-Fe-Mn intermetallic compounds,since the anodic oxide films are absent at the boundary between the normal oxide films and these impurity *** improvement of pitting corrosion resistance of anodized Al-Cu alloy processed by ECAP appears to be attributed to a decrease in the size of precipitates,which act as origins of pitting corrosion.

关键词：铝铜合金抗点蚀挤压转角通道

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A hydrochemical approach to estimate mountain front recharge in an aquifer system in Tamilnadu, India

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Acta Geochimica 2018年第3期37卷 465-488页

作者： Banaja Rani Panda S.Chidambaram N.Ganesh V.S.Adithya M.V.Prasanna K.Pradeep U.Vasudevan department of Earth Sciences Annamalai University department of Applied Geology Faculty of Engineering and Science Curtin University Malaysia

Mountain-front recharge(MFR) is a process of recharging an aquifer by infiltration of surface flow from streams and adjacent basins in a mountain block and along a mountain front(MF). This is the first attempt in India to estimate MFR along the foothills of Courtallam using hydrogeochemistry and geostatistical tools. The estimation of MFR has been carried out by collecting groundwater samples along the foothills of Courtallam. Collected water samples were analyzed for major cations and anions using standard procedures. Hydrogeochemical facies show the existence of four water types in this region. Calcium-rich water derived from gneissic rock terrain indicates significant recharge from higher elevation. Log p CO_2 and ionic strength of the samples were also calculated to identify the geochemical process. Majority of the collected samples have sodium-rich water and weak ionic strength, which indicate foothill recharge and low residence time. Silicate and carbonate weathering have an equal interplay along the foothills with a relatively large fraction of Mg from the MF. The spatial diagrams of three factors show that the southern part of the study area is dominated by both weathering and anthropogenic processes, whereas the northern part is dominated by both leaching and weathering processes. Thus, the dominant weathering process represented by the second factor indicates the large recharge process along the foothills.

关键词： Mountain-front recharge Geostatistical toolsHydrogeochemical facies Ionic ratio Anthropogenicprocesses

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