检索结果-南通市图书馆

People’s perception and socioeconomic determinants of soil erosion:A case study of Samanalawewa watershed, Sri Lanka

引用

International journal of Sediment Research 2010年第4期25卷 323-339页

作者： E.P.N. UDAYAKUMARA R.P.SHRESTHA L.SAMARAKOON D.SCHMIDT-vogt Natural Resource Management Field of Study School of Environment Resources and Development Asian Institute of Technology Natural Resources Management Field of Study School of Environment Resources and Development Asian Institute of Technology Geoinformatics Centre Asian Institute of Technology Centre of Mountain Ecosystem Studies Kunming Institute of Botany Chinese Academy of Sciences 3/F Library Building Heilongtan

Though soil erosion is an important concern in Sri Lanka, there is a dearth of baseline information on soil erosion in many ofits watersheds, which obstructs monitoring of soil erosion and mitigating its effects. In order to assess soil erosion in a critical watershed and to identify its determinants, the Samanalawewa watershed, which contains one of the main hydropower generating reservoirs in Sri Lanka, was selected for this study. Remote-sensing (RS) and geographic information system (GIS) based modeling as well as field experiments were employed to assess and map soil erosion rates. Results indicated that the current rate of soil erosion ranges from 0 to 289 t/ha/yr, and that the average rate of soil erosion has been declining from 20 to 4 t/ha/yr over a period from 1986 to 2008. The current rate of soil erosion is, however, still about 14 to 33 times greater than the natural soil generation rate. Socioeconomic factors and peoples’ perception of soil erosion and soil conservation measures were examined using data collected through a household survey. Multiple regression analysis with eighteen covariates of socioeconomic characteristics yielded eleven socioeconomic variables, viz. household size, farm labor, education, land tenure, conservation cost, training, committee membership, professional competencies, income, distance, and financial capital as the predictor variables of soil erosion. Farmers identified improper soil and crop management practices as the major causes of erosion. The adoption of conservation measures, their effectiveness, and their impact on ecosystem services were also examined.

关键词： Soil erosion People perception Determinants of soil erosion Conservation measures Sri Lanka

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

SIMULATION OF PARTICLE COATING IN THE SUPERCRITICAL FLUIDIZED BED

引用

China Particuology 2005年第1期3卷 113-124页

作者： Carsten vogt Ernst-Ulrich Hartge joachim Werther Gerd Brunner Technical University Hamburg-Harburg D21071 Hamburg Germany

Fluidized bed technology using supercritical carbon dioxide both as a fluidizing gas and as a solvent for the coating material makes possible the production of thin, uniform and solvent-free coatings. But operation at low fluidizing velocities, which is favorable to facilitate gas cleaning under the high pressure conditions, may lead to uneven distribution of the coating in the fluidized bed and to unstable operation due to agglomeration. Therefore a model has been developed which describes local fluid dynamics within the high pressure fluidized bed. Based on this model, the coating process is described and the distribution of the coating inside the fluidized bed is calculated. Furthermore a submodel for the calculation of local concentrations of liquid paraffin has been set up, which may be used as a basis for the prediction of agglomeration and thus stability of operation.

关键词： particle coating fluidized bed supercritical fluid fluid mechanics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Cooperative atomic scattering from a coherent matter wave

Cooperative atomic scattering from a coherent matter wave

引用

第十四届全国量子光学学术会议

作者： Thibault vogt School of Electronics Engineering and Computer Science Peking University

＜正＞The cooperative atomic scattering from a Bose-Einstein condensate（BEC） is useful and important to deeply understand the interaction between light and atom,the matter wave amplification,precise measurement,and ...

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Identification of two glycerophosphodiester phosphodiesterase genes in maize leaf phosphorus remobilization

引用

The Crop journal 2021年第1期9卷 95-108页

作者： jingxin Wang Wenbo Pan Alexiy Nikiforov William King Wanting Hong Weiwei Li Yang Han jana Patton-vogt jianbo Shen Lingyun Cheng Key Laboratory of Plant-Soil Interactions Ministry of Education/Key Laboratory of Plant NutritionMinistry of AgricultureDepartment of Plant NutritionChina Agricultural UniversityBeijing 100193China State Key Laboratory of Plant Genomics Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China Department of Biological Sciences Duquesne UniversityPittsburghPA 15282USA

Phosphate deficiency is one of the leading causes of crop productivity *** degradation liberates phosphate to cope with phosphate *** phosphodiesterases(GPX-PDEs)hydrolyse the intermediate products of phospholipid catabolism glycerophosphodiesters into glycerol-3-phosphate,a precursor of ***,the function of GPX-PDEs in phosphate remobilization in maize remains *** the present study,we characterized two phosphate deficiency-inducible GPX-PDE genes,ZmGPX-PDE1 and ZmGPX-PDE5,in maize ***-PDE1 and ZmGPX-PDE5 were transcriptionally regulated by ZmPHR1,a well-described phosphate starvation-responsive transcription factor of the MYB *** of the yeast GPX-PDE mutant gde1Δindicated that ZmGPX-PDE1 and ZmGPX-PDE5 functioned as GPX-PDEs,suggesting their roles in phosphate recycling from *** vitro enzyme assays showed that ZmGPX-PDE1 and ZmGPX-PDE5 catalysed glycerophosphodiester degradation with different substrate preferences for glycerophosphoinositol and glycerophosphocholine,***-PDE1 was upregulated during leaf senescence,and more remarkably,loss of ZmGPXPDE1 inmaize compromised the remobilization of phosphorus fromsenescing leaves to young leaves,resulting in a stay-green phenotype under phosphate *** results suggest that ZmGPX-PDE1 catalyses the degradation of glycerophosphodiesters in maize,promoting phosphate recycling from senescing leaves to new *** mechanism is crucial for improving phosphorus utilization efficiency in crops.

关键词： Glycerophosphodiester phosphodiesterases Maize Phosphate deficiency Phosphorus remobilization Phospholipid

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Beneficial impact of lithium bis(oxalato)borate as electrolyte additive for high-voltage nickel-rich lithium-battery cathodes

引用

InfoMat 2023年第8期5卷 67-80页

作者： Fanglin Wu Angelo Mullaliu Thomas Diemant Dominik Stepien Tatjana NParac-vogt jae-Kwang Kim Dominic Bresser Guk-Tae Kim Stefano Passerini Helmholtz Institute Ulm(HIU) UlmGermany Karlsruhe Institute of Technology(KIT) KarlsruheGermany Department of Chemistry KU LeuvenLeuvenBelgium Department of Energy Convergence Engineering Cheongju UniversityCheongjuRepublic of Korea Chemistry Department Sapienza University of RomeRomeItaly

High-voltage nickel-rich layered cathodes possess the requisite,such as excellent discharge capacity and high energy density,to realize lithium batteries with higher energy ***,such materials suffer from structural and interfacial instability at high voltages(>4.3 V).To reinforce the stability of these cathode materials at elevated voltages,lithium borate salts are investigated as electrolyte additives to generate a superior cathode-electrolyte ***,the use of lithium bis(oxalato)borate(LiBOB)leads to an enhanced cycling stability with a capacity retention of 81.7%.Importantly,almost no voltage hysteresis is detected after 200 cycles at *** outstanding electrochemical performance is attributed to an enhanced structural and interfacial stability,which is attained by suppressing the generation of micro-cracks and the superficial structural degradation upon *** improved stability stems from the formation of a fortified borate-containing interphase which protects the highly reactive cathode from parasitic reactions with the ***,the decomposition process of LiBOB and the possible adsorption routes to the cathode surface are deduced and elucidated.

关键词： cathode electrolyte interphase electrolyte additive high voltage cathodes LiBOB nickel-rich cathodes

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Intracellular in situ labeling of Ti02 nanoparticles for fluorescence microscopy detection

引用

Nano Research 2018年第1期11卷 464-476页

作者： Koshonna Brown Ted Thurn Lun Xin William Liu Remon Bazak Si Chen Barry Lai Stefan vogt Chris jacobsen Tatjana Paunesku Gayle E. Woloschak Department of Radiation Oncology Feinberg School of Medicine Northwestern University Chicago Illinois 60611 USA X-ray Science Division Advanced Photon Source Argonne National Laboratory 9700 South Cass Avenue Argonne Illinois 60439 USA Department of Physics & Astronomy Weinberg College of Arts and Sciences 2145 Sheridan Road Evanston Illinois 60208 USA

Titanium dioxide （TiO2） nanoparticles are produced for many different purposes, including development of therapeutic and diagnostic nanoparticles for cancer detection and treatment, drug delivery, induction of DNA double-strand breaks, and imaging of specific cells and subcellular structures. Currently, the use of optical microscopy, an imaging technique most accessible to biology and medical patholog36 to detect TiO2 nanoparticles in cells and tissues ex vivo is limited with low detection limits, while more sensitive imaging methods （transmission electron microscopy, X-ray fluorescence microscop~ etc.） have low throughput and technical and operational complications. Herein, we describe two in situ post- treatment labeling approaches to stain TiO2 nanoparticles taken up by the cells. The first approach utilizes fluorescent biotin and fluorescent streptavidin to label the nanoparticles before and after cellular uptake; the second approach is based on the copper-catalyzed azide-alkyne cycloaddition, the so-called Click chemistry, for labeling and detection of azide-conjugated TiO2 nanoparticles with alkyne- conjugated fluorescent dyes such as Alexa Fluor 488. To confirm that optical fluorescence signals of these nanoparticles match the distribution of the Ti element, we used synchrotron X-ray fluorescence microscopy （XFM） at the Advanced Photon Source at Argonne National Laboratory. Titanium-specific XFM showed excellent overlap with the location of optical fluorescence detected by confocal microscopy. Therefore, future experiments with TiO2 nanoparticles may safely rely on confocal microscopy after in situ nanoparticle labeling using approaches described here.

关键词： TiO2 nanoparticles anatase Click reaction biotin-streptavidin synchrotron X-ray fluorescence microscopy

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

PROline-Ultrasonic Testing for Electron Beam and Laser Weld Seams of Transmission Control Gears-Many more Applications in Production

PROline-Ultrasonic Testing for Electron Beam and Laser Weld ...

引用

17th World Conference on Non-Destructive Testing

作者： Goeran vogt Carsten KOEHLER vogt Werkstoffpruefsysteme GmbH BurgwedelGermany Burgwedel.Lower Saxony Germany

＜正＞The ultrasonic testing with pulse echo method has been approved since many years as a user suitable and expressive non-destructive testing method for electron beam-and laser weld *** PROline-S system is used *** the inspection especially at transmission control gears for the automotive industry in *** the process of immersion technique the ultrasound will be beamed radially into the weld seam of the rotating transmission control gear by means of a fixed vertical *** further developed PROline-S ultrasonic inspection system now is provided with a waterless coupling by a rubber *** doing so with a gear inspector’s stamp there will be created a membrane-enclosed tank inside the coupler *** enables cost-efficient solutions with conventional and new designed immersion systems for control gears matched for short test cycles and easy *** focus is on scan functions by low hardware and control effort as well as simple handling mechanics for the testing in variable inspection systems for different *** can be leveraged for inline-and offline testing in mechanized and automatic processes as well as for monitoring in production and application in the aerospace-,aviation-, automotive-,railroad-,steel-,plastic-and ceramic industries as well as at universities and research *** application ranges from wall thickness measurement up to the integration into all kinds of production line systems for inline inspection as well as upgrading and retrofitting of existing ultrasonic testing systems and adaption of customer designed *** the PROline ultrasonic inspection system is designed for production with automatic data acquistion and *** multifunctional screen display shows the A-,B-or C-scan and at the same time the evaluation of the parts as well as the statistical process *** ultrasonic system communicates by digital I/O ports with the PLC of the inspection mechanics.

关键词： PROline ultrasonic system Electron beam welds Laser beam welds Inline production testing Ultrasound Waterless couplent Immersion tank

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Importance of sulfate emission to sulfur deposition at urban and rural sites in China

Importance of sulfate emission to sulfur deposition at urban...

引用

作者： Rolf D.vogt University of Oslo Department of Chemistry1033 Blindern0315 OsloNorway

Throughfall(TF) and wet only(WO) deposition *** SO and sulfate(SO) concentration in air at 4 urban and rural sites in southwestern China were monitored in order to understand the role of different forms of sulfur(S) emission to the S deposition and its effect in *** sites were located in Chongqing,Hunan,and Guizhou provinces.S deposition at the most polluted site reached 15 g S m *** three of the sites,located in the vicinity of several emission sources,dry S deposition is 2.1-4.2 times that of wet deposition,which is significantly higher than what is found in most other parts of the world. Main components in airborne particles(PM) are(NH)SO and CaSO at the highly polluted Tie Shan Ping(TSP) *** particles of gypsum(CaSO) in the air are partly due to direct emission and partly from the reaction of calcium oxides and carbonates with sulfuric acid in the *** illustrate the importance of sulfate emission to total S deposition we analyzed the source of S deposition based on both measurements and *** indicated that direct emission of SO particles could,account for high proportion in total S deposition at the three most polluted sites.

关键词： Sulfur deposition Gypsum Throughfall Wet only CMAQ

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

FRAGMENTATION FUNCTIONS IN e＋e-, ep AND pp COLLISIONS

引用

Chinese Physics C 2016年第10期40卷 337-348页

作者： O. Biebel D. de Florian D. Milstead A. vogt Ludwig-Maximilians-Universitat Munich Germany ICAS UNSAM San Martfn and Dep. de Fisica FCEyN-UBA Buenos Aires Argentina Fysikum Stockholms Universitet Sweden Dep. of Mathematical Sciences University of Liverpool UK

20.1. Introduction to fragmentation The term ＇fragmentation functions＇ is widely used for two conceptually different （albeit related） sets of functions describing final-state single particle energy distributions in hard scattering processes （see Refs. [1,2] for introductory reviews, and Refs. [3,4] for summaries of experimental and theoretical research in this field）.

关键词：

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

外伤性主动脉破裂致全程胸主动脉夹层1例

引用

中华胸心血管外科杂志 2003年第4期19卷 255-256页

作者： PaulR.vogt joergBabin-Ebell ErwinP.Bauer DepartmeritforCatdlovasctdarSurgery UniversityHospitalGiessenRudolf-Buch-heim-Strasse7D-35385GiessenGerraany 不详

抢救1例因摩托车事故急诊入院男病人.X线胸片发现病人右气管旁外侧纹理和左纵隔影异常增宽,并扩展至主动脉弓水平.经食管心脏超声检查发现围绕主动脉根部和升主动脉的壁间水肿,延伸至主动脉弓和左横膈下水平的全程降主动脉;左锁骨下动... 详细信息

抢救1例因摩托车事故急诊入院男病人.X线胸片发现病人右气管旁外侧纹理和左纵隔影异常增宽,并扩展至主动脉弓水平.经食管心脏超声检查发现围绕主动脉根部和升主动脉的壁间水肿,延伸至主动脉弓和左横膈下水平的全程降主动脉;左锁骨下动脉起始点远端降主动脉上端全层断裂.急诊手术行降主动脉上端端端吻合,终因心跳骤停未及手术死亡.尸检证实全程胸主动脉自破裂处向前和逆向延伸,引起双向主动脉夹层.

关键词：外伤性主动脉破裂全程胸主动脉夹层 X线胸片心跳骤停

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：