检索结果-南通市图书馆

w.ak correlation of flow.r color and nectar-tube depth in temperate grasslands

Journal of plant Ecology 2017年第2期10卷 397-405页

作者： Julia Binkenstein Martina Stang Julien p.Renoult H.Martin schaefer Chair of Nature Conservation and Landscape Ecology Faculty of Environment and Natural ResourcesUniversity of FreiburgTennenbacher Straße 479106 FreiburgGermany Section plant Ecology and phytochemistry Institute of Biology LeidenLeiden UniversitySylviusweg 722300 RA LeidenThe Netherlands Institute of Arts Creation Theory and Aesthetics UMR 8218-CNRS47 r.des bergers75015 ParisFrance Fundacion Jocotoco Lizardo GarcíaE9-104 y Andrés XauraP.O.Box 17-16-337QuitoEcuador

Aims Nectar is one of the most common floral rew.rds offered to pol-linators by *** on the plant species,nectar is offered openly or in tubes of various lengths restricting accessibility of this resource for flow.r visitors w.th short *** attract-ing pollinators that match floral morphology increases pollination efficiency,flow.rs could profit from signaling nectar-tube depth to *** flow.r colors are important signals in plant-pol-linator communication,w. investigated w.ether and w.ich differ-ent chromatic or achromatic aspects of flow.r color might indicate nectar-tube depth or w.ether flow.r colors facilitate the differen-tiation betw.en flow.rs w.th long nectar tubes by means of high chromatic *** To this end,w. collected flow.r reflectance spectra of 135 grassland plant *** analyzed flow.r colors as raw.reflectance spectra in principal component analysis(pCA)and in the color space of *** Findings The correlation betw.en flow.r colors and tube depths w.s *** the bee’s point of view.blue flow.rs had on average deeper tubes than green,blue-green and UV-green flow.rs potentially allow.ing insects to predict tube depths based on blue *** purity did not correlate w.th nectar-tube depth,nor did the chromatic uniqueness of flow.r colors in the honeybee color *** w.velength show.d a significant but very w.ak correlation w.th tube *** achromatic green contrast decreased w.th increasing tube depth as did brightness;thus deep tubes w.re less conspicuous than shallow.*** components resulting from pCA did not or only slightly correlate w.th tube *** results illustrate that flow.r colors may have a certain potential to indicate tube depth,*** accessibility,from a bee’s perspective.

关键词： vision pollination efficiency plant-animal interaction nectar tube depth

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

Development of a w.b-platform for mining applications

引用

International Journal of Mining Science and Technology 2018年第1期28卷 95-99页

作者： Christopher New.an Zach Agioutantis Nathaniel schaefer Department of Mining Engineering University of Kentucky

‘‘w.b ground control"(w.b GC) provides users w.th instantaneous access to mine design applications anyw.ere, at any time, through a w.b *** a w.b-based multiple-tier architecture, users are able to easily access ground control designs, perform on-demand calculations in the field, as w.ll as facilitate project collaborations across multiple users, devices, and operating ***, the w.b GC platform contains five ground control related design applications previously developed and distributed by the US National Institute of Occupational Safety and Health(NIOSH), that is, analysis of roof bolt stability(ARBS), analysis of longw.ll pillar stability(ALpS), analysis of retreat mining stability(ARMpS), analysis of retreat mining stability–highw.ll mining(ARMpS-Hw.), and analysis of horizontal stress in mining(AHSM).w.th respect to design decisions made by the w.b GC development team, the w.b GC platform w.ll be able to further integrate future mine design applications providing the mining industry w.th one of a kind umbrella suite of ground control related softw.re available at ones *** follow.ng paper provides a detailed overview.on the current state of the w.b GC platform w.th discussions ranging from back-end database development and design to the front-end user-platform *** on current progress in platform development as w.ll as beta testing results, the w.b GC platform is scheduled for release in the fall of 2018.

关键词： Ground control Stability w.b application Cloud computing

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

Variations in net litter nutrient input associated w.th tree species influence on soil nutrient contents in a subtropical evergreen broad-leaved forest

引用

Chinese Science Bulletin 2014年第1期59卷 46-53页

作者： Lu Qiao Doug Allen schaefer Xiaoming Zou Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical Garden Chinese Academy of Sciences University of Chinese Academy of Sciences Department of Environmental Studies University of Puerto Rico

The influence of tree species on soils has received much attention,but w. know.little about either the pattern and underlying mechanisms of net nutrient and carbon inputs under canopy for various tree species or the effects of net nutrient input on soil nutrient *** address these issues,w. selected three tree species w.th distinct leaf sizes and arranged litter traps around the target individuals to test w.at affected net nutrient and carbon inputs under canopy of target individuals,and how.net nutrient inputs influenced soil nutrient *** results show.d that net litter manganese(Mn)and lignin inputs w.re significantly different among these tree species,as w.ll as soil exchangeable potassium(K),available iron(Fe)and available *** results also revealed that the species w.th the smallest sized leaves may stimulate more net Mn and lignin inputs than the species w.th the largest sized *** the same time,net nutrient inputs correlated w.th soil available Fe,w.ile the ratio of lignin to nitrogen of net litter correlated w.th total phosphorus *** results demonstrated that litter production may be the main factor deciding net nutrient and carbon inputs under different tree species’canopy,w.ich significantly differentiated soil iron’s availability.

关键词：土壤养分含量亚热带常绿阔叶林树种枯落物输入营养养分投入木质素

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

Effect of micro-dimple patterns on capillary pull-off force and friction force of silicon surface

引用

Chinese physics B 2009年第1期18卷 231-237页

作者：张向军董云开刘永合 J.A.schaefer State Key Laboratory of Tribology Tsinghua University Institute of physics and Center of Micro/nano Technology Technich University of IlmenauPF 100565Germany

A microtribometer is used to measure and compare pull-off forces and friction forces exerted on （a） micro-dimpled silicon surfaces, （b） bare silicon surfaces, and （c） octadecyltrichlorosilane （OTS） treated silicon surfaces at different relative humidity （RH） levels separately. It is found that above a critical RH level, the capillary pull-off force increases abruptly and that the micro-dimple textured surface has a low.r critical RH value as w.ll as a higher pull-off force value than the other tw. surfaces. A micro topography parameter, namely sidew.ll area ratio, is found to play a major role in controlling the capillary pull-off force. Furthermore, micro-dimpled silicon surface is also proved to be not sensitive to variation in RH level, and can realize a stable and decreased friction coefficient compared w.th un-textured silicon surfaces. The reservoir-like function of micro dimples is considered to w.aken or avoid the breakage effect of liquid bridges at different RH levels, thereby maintaining a stable frictional behaviour.

关键词： micro-dimpled surface capillary pull-off force frictional property relative humidity

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

Evaluation of strategies for the subsequent use of CO_(2)

引用

Frontiers of Chemical Science and Engineering 2010年第2期4卷 172-183页

作者： Marc schaefer Frank BEHRENDT Thomas HAMMER Berlin Institute of Technology Institute for Energy Process Engineering and Conversion Technologies for Renewable EnergiesBerlin 10623Germany Siemens AG Corporate TechnologyCT PS 591052 ErlangenGermany

If substantial amounts of CO_(2),w.ich according to actual scenarios may in the future be captured from industrial processes and pow.r generation,shall be utilized effectively,scalable energy efficient technologies w.ll be ***,a survey w.s performed to assess a large variety of applications utilizing CO_(2) chemically(e.g.,production of synthesis-gas,methanol synthesis),biologically(e.g.,CO_(2) as fertilizer in green houses,production of algae),or physically(enhancement of fossil fuel recovery,use as refrigerant).For each of the processes,material and energy balances w.re set *** w.th pure CO_(2) at standard conditions,expenditure for transport and further process specific treatment w.re *** on these calculations,the avoidance of greenhouse gas emissions by applying the discussed technologies w.s *** on the currently available technologies,applications for enhanced fossil fuel recovery turn out to be most attractive regarding the potential of utilizing large quantities of CO_(2)(total capacity>1000 Gt CO_(2))and producing significant amounts of marketable products on one hand and having good energy and material balances on the other hand(t_(CO_(2)-emitted)/t_(CO_(2)-utilized)providing valuable products like fuels is w.rth considering,if carbon-free energy sources are used to provide the process energy and H2 being essential as a reactant in a lot of chemical processes(e.g.,production of DME:t_(CO_(2)-emitted)/t_(CO_(2)-utilized)>0.34).Biological processes such as CO_(2) fixation using microalgae look attractive as long as energy and CO_(2) balance are ***,the development of effective photobioreactors for grow.ng algae w.th low.requirements for footprint area is a challenge.

关键词： CO_(2) utilization survey energy balances synthesis-gas green houses micro-algae fossil fuel recovery

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

Hepatitis B virus taxonomy and hepatitis B virus genotypes

引用

w.rld Journal of Gastroenterology 2007年第1期13卷 14-21页

作者： Stephan schaefer Abteilung für Virologie Institut für Medizini-sche MikrobiologieVirologie und HygieneUniversitt RostockSchillingallee 70D-18057 RostockGermany

Hepatitis B virus(HBV) is a member of the hepadnavirus *** can be found in both mammals(orthohepadnaviruses) and birds(avihepadnaviruses).The genetic variability of HBV is very *** are eight genotypes of HBV and three clades of HBV isolates from apes that appear to be additional genotypes of *** genotypes are now.divided into subgenotypes w.th distinct virological and epidemiological *** addition,recombination among HBV genotypes increases the variability of *** review.summarises current know.edge of the epidemiology of genetic variability in hepadnaviruses and,due to rapid progress in the field,updates several recent review. on HBV genotypes and subgenotypes.

关键词： Orthohepadnavirus Avihepadnavirus Hepatitis B virus Genotype, Subgenotype Recombination

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

Encapsulating segment-like antimony nanorod in hollow.carbon tube as long-lifespan,high-rate anodes for rechargeable K-ion batteries

引用

Nano Research 2019年第5期12卷 1025-1031页

作者： w.n Luo Feng Li w.iran Zhang Kang Han Jean-Jacques Gaumet Hans-Eckhardt schaefer Liqiang Mai Department of physics School of ScienceWuhan University of TechnologyWuhan 430070China Hefei National Laboratory for physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230000China Division of Materials Science and Engineering Boston UniversityMA 02215USA State Key Laboratory of Advanced Technology for Materials Synthesis and processing International School of Materials Science and Technology Wuhan University of TechnologyWuhan 430070China Laboratoire de Chimie et physique: Approche Multi-echelles des Milieux Complexes Institut Jean BarriolUniversite de LorraineMetz 57070France Institute for Functional Matter and Quantum Technologies Stuttgart UniversityPfaffenwaldring 57Stuttgart 70569Germany

K-ion battery (KIB) is a new.type energy storage device that possesses potential advantages of low.cost and abundant resource of *** develop advanced electrode materials for accommodating the large size and high activity of potassium ion is of great ***,a segment-like antimony (Sb) nanorod encapsulated in hollow.carbon tube electrode material (Sb@HCT) w.s *** from the virtue of abundant nitrogen doping in carbon tube,one-dimensional and hollow.structure advantages,Sb@HCT exhibits excellent potassium storage properties:in the case of potassium bis(fluorosulfonyl)imide (KFSI) electrolyte,Sb@HCT displays a reversible capacity of up to 453.4 mAh·g^-1 at a current density of 0.5 A·g^-1 and good rate performance (a capacity of 211.5 mAh·g^-1 could be achieved at an ultrahigh rate of 5 A·g^-1).Additionally,Sb@HCT demonstrates excellent long-cycle stability at a current density of 2 A·g^-1 over 120 ***,electrolyte optimization is an effective strategy for greatly improving electrochemical *** ex-situ characterizations,w. disclosed the potassiation of Sb anode is quite reversible and undergoes multistep processes,combining solid solution reaction and tw.-phase reaction.

关键词： K-ion battery antimony anode hollow carbon tube encapsulation electrolyte optimizati on potassium storage mechanism

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

多/全电飞机用高速开关磁阻起动/发电机优化控制(英文)

引用

电工技术学报 2010年第4期25卷 44-52页

作者：宋受俊刘卫国 Uw. schaefer 西北工业大学西安710072 柏林工业大学柏林10587

介绍了开关磁阻起动/发电(SRS/G)系统的应用背景,对系统的性能要求进行了描述,并给出了一台30kw.关磁阻电机(SRM)的定、转子叠片结构及尺寸。基于以上工作,对SRM的优化控制方法进行了研究:在起动阶段,SRM运行在电动状态,以平均转矩最... 详细信息

介绍了开关磁阻起动/发电(SRS/G)系统的应用背景,对系统的性能要求进行了描述,并给出了一台30kw.关磁阻电机(SRM)的定、转子叠片结构及尺寸。基于以上工作,对SRM的优化控制方法进行了研究:在起动阶段,SRM运行在电动状态,以平均转矩最大化作为优化目标,对包括解析、数值及浮角在内的三种优化控制方法进行了深入的研究,并对它们的优化结果进行了详细的比较及分析;在发电阶段,SRM运行在发电状态,以特定输出功率下的系统效率最大化作为优化目标,得到了使主功率损耗最小的优化励磁角。

关键词：多/全电飞机(M/A EA) 集成起动/发电机(IS/G) 开关磁阻电机(SRM) 优化励磁平均转矩效率最大化

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

Older candidates for kidney transplantation:w.o to refer and w.at to expect?

引用

w.rld Journal of Transplantation 2016年第4期6卷 650-657页

作者： Beatrice p Concepcion Rachel C Forbes Heidi M schaefer Department of Medicine Division of Nephrology and Hypertension Vanderbilt University Medical Center Division of Kidney and pancreas Transplantation Vanderbilt University Medical Center

The number of older end-stage renal disease patients being referred for kidney transplantation continues to increase. This rise is occurring alongside the continually increasing prevalence of older end-stage renal disease patients. Although older kidney transplant recipients have decreased patient and graft survival compared to younger patients, transplantation in this patient population is pursued due to the survival advantage that it confers over remaining on the deceased donor w.iting list. The upper limit of age and the extent of comorbidity and frailty at w.ich transplantation ceases to be advantageous is not know.. Transplant physicians are therefore faced w.th the challenge of determining w.o among older patients are appropriate candidates for kidney transplantation. This is usually achieved by means of an organ systemsbased medical evaluation w.th particular focus given to cardiovascular health. More recently, global measures of health such as functional status and frailty are increasingly being recognized as potential tools in risk stratifying kidney transplant candidates. For those candidates w.o are deemed eligible, living donor transplantation should be pursued. This may mean accepting a kidney from an older living donor. In the absence of any living donor, the choice to accept lesser quality kidneys should be made w.ile taking into account the organ shortage and expected w.iting times on the deceased donor list. Appropriate counseling of patients should be a cornerstone in the evaluation process and includes a discussion regarding expected outcomes, expected w.iting times in the setting of the new.Kidney Allocation System, benefits of living donor transplantation and the acceptance of lesser quality kidneys.

关键词： Kidney transplant outcomes Frailty Elderly Expanded criteria donor Quality of life

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

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

引用

半导体技术 2004年第7期29卷 86-91页

作者： R. pelzer p. Lindner T. Glinsner B.Vratzov C.Gourgon S.Landis p. Kettner C. schaefer EV Group DI Erich Thallner Strasse 1 A-4780 SchaerdingEV Group DI Erich Thallner Strasse 1 A-4780 SchaerdingEV Group DI Erich Thallner Strasse 1 A-4780 SchaerdingAMICA AMO GmbH Huysensweg 25 D-52074 AachenLaboratoire des Technologies de la Microelectronique CNRS 17 R. des MartyrsF- 3805Grenoble Cedex4CEA-LETI 17 R. des Martyrs F- 38054 Grenoble CedexEV Group DI Erich Thallner Strasse 1 A-4780 SchaerdingEV Group DI Erich Thallner Strasse 1 A-4780 Schaerding

Nanoimprint Lithography has been demon-strated to be one of the most promising next genera-tion techniques for large-area structure replicationin the nanometer scale. This fast and low.costmethod becomes an increasingly important instru-ment for fabrication of biochemistry,m-fluidic, m-TAS and telecommunication devices, as w.ll as for aw.de variety of fields in the nm range, like biomedical,nano-fluidics,nano-optical applications, datastorage, *** to the restrictions on w.velength and theenormous development w.rks, linked to high pro-cess and equipment costs on standard lithographysystems, nanoimprint lithography might become areal competitive method in mainstream IC *** are no physical limitations encountered w.thimprinting techniques for much smaller replicatedstructures, dow. to the sub-10nm range [1]. Amongseveral Nanoimprint lithography techniques resultsof tw. promising methods, hot embossing lithogra-phy (HEL) and UV-nanoimprinting (UV-NIL) w.ll bepresented. Both techniques allow.rapid prototypingas w.ll as high volume production of fully patternedsubstrates for a w.de range of *** paper w.ll present results on HE and UV-NIL, among them full w.fer imprints up to 200mmw.th high-resolution patterns dow. to nm range.

关键词：光刻 HEL UV-NIL MCp 光对准

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

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：