检索结果-南通市图书馆

Dispersal syndrome and landscape fragmentation in the salt-marsh specialist spider Erigone longipalpis

Current Zoology 2023年第1期69卷 21-31页

作者： Maxime Dahirel Marie Wullschleger Tristan Berry Solène Croci Julien Pétillon Univ Rennes UR1CNRSEcosystèmesBiodiversitéÉvolution(ECOBIO)UMR 6553F-35000 RennesFrance Department of Biology Ghent UniversityB-9000 GhentBelgium Syndicat Mixte de Gestion des Milieux Naturels Réserve Naturelle Nationale de l’Étang NoirF-40510 SeignosseFrance CNRS Universitéde Rennes 2EPHE-PSLUniversitéd’AngersUniversitéde Bretagne OccidentaleUniversitéde Caen NormandieUniversitéde NantesUMR LETGF-35043 RennesFrance Institute for Coastal and Marine Research Nelson Mandela UniversityPort Elizabeth 6031South Africa

Dispersal and its evolution play a key role for population persistence in fragmented landscapes where habitat loss and fragmentation increase the cost of between-habitat *** such contexts,it is important to know how variation in dispersal and other traits is structured,and whether responses to landscape fragmentation are aligned with underlying dispersal-trait correlations,or dispersal ***,therefore,studied trait variation in Erigone longipalpis,a European spider species specialist of(often patchy)salt *** collected spiders in two salt-marsh landscapes differing in habitat *** then reared lab-born spiders for two generations in controlled conditions,and measured dispersal and its association with various key *** longipalpis population densities were lower in the more fragmented *** this,we found no evidence of differences in dispersal,or any other trait we studied,between the two *** a dispersal syndrome was present at the among-individual level(dispersers were more fecund and faster growing,among others),there was no indication it was genetically driven:among-family differences in dispersal were not correlated with differences in other ***,we showed that the observed phenotypic covariations were mostly due to within-family *** hypothesize that the dispersal syndrome is the result of asymmetric food access among siblings,leading to variation in development rates and carrying over to adult *** results show we need to better understand the sources of dispersal variation and syndromes,especially when dispersal may evolve rapidly in response to environmental change.

关键词： context-dependent dispersal habitat loss Linyphiidae phenotypic correlations population density

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

Formation building and collision avoidance for a fleet of NAOs based on optical sensor with local positions and minimum communication

引用

Science China(Information Sciences) 2019年第5期62卷 214-236页

作者： Xiaomin WANG Lorenzo BENOZZI Benoit ZERR Zexiao XIE Hélène THOMAS Benoit CLEMENT Engineering college Ocean University of China

Multi-robot system has become a research hotspot because of low demand on the sensors’ accuracy, high reliability, and high efficiency. To put all the robots together, formation control is a crucial problem. In this paper, we propose a local position-based method to plan trajectories and build a pyramid pattern for a fleet of NAOs in the obstacle-free environment by refering to the position-based method and giving an O(n log n) collision avoidance strategy inspired from one graph theory, where the local positions are estimated from optical sensors. To get the local positions, an integrated image processing method is developped. Firstly a mask-base is generated to store the features of NAOs, and a cross-correlation method is introduced to recognize the NAO. Subsequently, the distance and angle models are proposed to get the local information from a single image. Then, a visual compass is introduced to obtain the orientation of one NAO. After the local information exchange by the WiFi communication, a neighbor-check method is put foward to distinguish the homogeneous NAOs(all the NAOs look like the same). Further, a common frame is constructed as an artificial global frame, and straight non-intercrossing trajectories are planned according to the O(n log n) collision avoidance strategy. At last, the performance of our proposed local position-based method is verified by the simulations with up to 15 robots and the indoor experiments with 3 NAOs in a real environment. The convergence of the method has been demonstrated in both obstacle-free and static obstacle environments.

关键词： formation building a fleet of NAOs optical sensor visual compass local positions

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

Product Data Model for Performance-driven Design

引用

Chinese Journal of Mechanical Engineering 2017年第5期30卷 1112-1122页

作者： Guang-Zhong Hu Xin-Jian Xu Shou-ne Xiao Guang-Wu Yang Fan Pu School of Mechanical Engineering Sichuan University of Science and Engineering State Key Laboratory of Traction Power Southwest Jiaotong University

When designing large-sized complex machinery products, the design focus is always on the overall per- formance; however, there exist no design theory and method based on performance driven. In view of the defi- ciency of the existing design theory, according to the performance features of complex mechanical products, the performance indices are introduced into the traditional design theory of ＂Requirement-Function-Structure＂ to construct a new five-domain design theory of ＂Client Requirement-Function-Performance-Structure-Design Parameter＂. To support design practice based on this new theory, a product data model is established by using per- formance indices and the mapping relationship between them and the other four domains. When the product data model is applied to high-speed train design and combining the existing research result and relevant standards, the corresponding data model and its structure involving five domains of high-speed trains are established, which can provide technical support for studying the relationships between typical performance indices and design parame- ters and the fast achievement of a high-speed train scheme design. The five domains provide a reference for the design specification and evaluation criteria of high speed train and a new idea for the train＇s parameter design.

关键词： Complex product design Performance driven Data model Mapping relationship High-speed train

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

The value does not exist!A motivation for extremal analysis

引用

Probability, Uncertainty and Quantitative Risk 2022年第3期7卷 195-214页

作者： Jean-Pierre Aubin Hélène Frankowska Retired 14Rue Domat75005 ParisFrance CNRS IMJ-PRGSorbonne Université4Place Jussieu75252 ParisFrance

Standard mathematical economics studies the production,exchange,and consumption of goods“provided with units of measurement,”as in physics,in order to be enumerated,quantified,added,***,“baskets of goods,”which should describe subsets of goods,are mathematically represented as commodity vectors of a vector space,linear combination of units of goods,evaluated by prices,which are linear numerical ***,in this sense,mathematical economics is a branch of ***,economics,and many other domains of life sciences,investigate also what will be called entities,defining elements deprived of units of measure,which thus cannot be enumerated.(1)Denoting by X the set of entities x∈X deprived of units of measurement,a“basket of goods”is actually a subset K■X of the set entities,i.e.,an element of the“hyperset”P(X),the family of subsets of X,and no longer a commodity vector of the vector space of commodities;(2)Entities can be“gathered”instead of being“added”;(3)Entities can still be evaluated by a family of functions A:x 2 X 7!A(x)2 Rregarded as a“valuators,”in lieu and place of linear“prices”evaluating the units of economic goods.(4)Subsets of entities can be evaluated by an“interval of values”between two extremal ones,the minimum and the maximum,instead of the sum of values of units of goods weighted by their *** sciences dealing with intertwined relations among many combinations of entities,hypersets offer metaphors of“Lamarckian complexity”that keeps us away from binary relations,graphs of functions,and set-valued maps,to focus our attention on“multinary relations”between families of *** deprived of units of measurement,these“proletarian”entities still enjoy enough properties for this pauperization to be mathematically *** is the object of this extremal manifesto:in economics and other domains of life sciences,vector spaces should yield their imperial status of“state space”to hypersets and linear prices to hy

关键词： Valuators Extremal topologies Transfer of topologies Confined sets Extremal evolution Inert relation Viability kernel Regulator

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

Spatio-Temporal evolutive Data Infrastructure: a Spatial Data Infrastructure for managing data flows of Territorial Statistical Information

引用

International Journal of Digital Earth 2017年第3期10卷 257-283页

作者： Camille Bernard Marlène Villanova-Oliver Jérôme Gensel Benoit Le Rubrus Univ.Grenoble Alpes CNRSLIGGrenobleFrance

The observation of demographical,economical or environmental indicators over time through maps is *** enables analysing territories and helps stakeholders to take ***,the understanding of Territorial Statistical Information(TSI)is compromised unless comprehensive description of both the statistical methodology used and the spatial and temporal references are ***,in this paper,we stress the importance of metadata descriptions and of their quality that helps assessing data ***,time-series of such TSI are *** enable analysing a territory over a long period of time and likewise judging the effectiveness of *** light of these observations,we present Spatio-Temporal evolutive Data Infrastructure(STeDI)an innovative Spatial Data Infrastructure(SDI)that enriches the description of a Digital Earth,providing a virtual representation of territories and of their evolution through statistics and *** aims at managing a whole dataflow of multi-dimensional,multi-scale and multi-temporal TSI,from their acquisition to their dissemination to scientists and *** content of this SDI evolves autonomously thanks to automated processes and to a Web platform that help improving the quality of datasets uploaded by ***,STeDI allows visualizing up-to-date time-series reflecting the human activities on a given *** helps policy-makers in their decision-making process.

关键词： Spatial Data Infrastructure Territorial Statistical Information metadata data quality INSPIRE

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

Clinical impact of hepatitis B and C virus envelope glycoproteins

引用

World Journal of Gastroenterology 2013年第5期19卷 654-664页

作者： Hélène Jeulin Aurélie Velay John Murray Evelyne Schvoerer Virology Laboratory Centre Hospitalier Universitaire de NancyVandoeuvre-lès-NancyF-54511France EA RHEM 4369 Universitéde LorraineF-54000 NancyFrance School of Mathematics and Statistics University of New South WalesSydneyNSW 2052Australia The Kirby Institute University of New South WalesSydneyNSW 2052Australia

Chronic infection by either hepatitis B virus(HBV)or hepatitis C virus(HCV)share epidemiological characteristics with risks for development of severe complications such as liver cirrhosis and hepatocellular *** and HCV also share a high genetic variability. Among highly variable regions,viral genes encoding surface proteins(hepatitis B surface antigen,E1/E2 HCV glycoproteins)play key roles in the stimulation of the host-related immune response and viral entry into *** segments of HBV envelope proteins(preS1,"a"determinant)are crucial in the entry process into permissive *** entry is a complex multistep process involving multiple cell cofactors (glycosaminoglycans,low density lipoprotein receptor, SR-B1,CD81,claudin-1,occludin,EGFR,EphA2)in the interaction with HCV E1/E2 envelope *** vitro both viruses can be controlled by antibody-me-diated neutralization targeting viral envelope,also essential in preventing HBV infection in vivo as observed through successful vaccination using HBs *** preventive vaccination and/or therapeutic pressure can influence HBV and HCV *** HBV,the patterns of antiviral drug resistance in chronic hepatitis are complex and the original pol/S gene overlap has to be taken into ***-induced HBV mutations in pol could indeed generate S mutants with subsequent modified antigenicity or increased cancer *** of HBV and HCV envelope proteins combining high exposure to selective pressures and crucial functional roles require investigation in the context of diagnostic,vaccination and treatment *** this editorial a synthesis is performed of HBV and HCV envelope properties at the entry step and as antigenic proteins,and the subsequent clinical impact.

关键词： Hepatitis B Hepatitis C Viral envelope glycoproteins Clinical outcome

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

Granitic inselbergs of Lara(Panafrican Chain,Far-North Cameroon):Assets for the implementation of geotourism in Mountainous region

引用

Journal of Mountain Science 2022年第11期19卷 3192-3212页

作者： ZANGMO TEFOGOUM Ghislain NOUHOU DAMA Zouyane Hyacinthe GOUNTIÉDEDZO Merlin MAFO DONGMO Irène Department of Earth Sciences de la Terre Faculty of ScienceUniversity of MarouaP.O.Box 814 MarouaCameroon Department of Life and Earth Sciences High Teacher Training CollegeUniversity of MarouaP.O.Box 55MarouaCameroon

The locality of Lara(Far-North Region,Cameroon)is made up of a pediplain strewn with coalescent *** interaction of internal and external geological processes has contributed to transform the latter into inselbergs,whose geotouristic values are yet to be *** and laboratory work enabled us to select the geomorphosites through their aesthetic value(particular size and shape)and,geomorphological and geological ***,it permitted to study and map the geomorphosites using Optic Microscope,Google Earth,GIS software and many other ***,four inselbergs have been selected and studied in the locality of *** petrographic study of these inselbergs shows that granites are the main components of inselbergs and they present a fine to coarse-grained texture,materialized by quartz,micas,plagioclases and alkali feldspars(white and pink in colour).Inselbergs exhibit vertical and parallel networks of diaclases giving them a stratified appearance in some *** addition,on some inselberg limbs and piedmonts,are built tors which contribute to their *** tops of inselbergs,are embellished by several alluring pedestal *** their flanks,shelters of various shapes and sizes(about 12 m length)have developed through the heaps of blocks *** the ten shelters selected,some have a fairly high cultural value as they are sacred places for the local ***,Lara's granitic inselbergs include enclaves(cognate enclaves and xenocrysts)that also significantly improve their geoheritage *** are landforms with high education and aesthetic value that attracted a larger local and foreign population of about 863 visitors between *** constitute an exceptional geoheritage that could attract more tourists in the locality of Lara;but the promotion of geotourism is needed through interpretative panels,marketing of geomorphosites through leaflets,web,media,and geotours,to mention a few.

关键词： Lara Inselbergs Granite geoheritage Geotouristic activities

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

Establishing a blueprint for successful liver transplantation for alcohol-related cirrhosis:the importance of a multidisciplinary team

引用

Hepatobiliary Surgery and Nutrition 2022年第1期11卷 150-152页

作者： JoséUrsic-Bedoya Hélène Donnadieu-Rigole Department of Hepatogastroenterology Hepatology and Liver Transplantation UnitSaint Eloi HospitalUniversity of MontpellierMontpellierFrance Department of Addictology Saint Eloi HospitalUniversity of MontpellierMontpellierFrance

Liver transplantation(LT)for alcohol-related liver disease(ALD)has come a long way since the implementation of LT as a standard *** considered a contra-indication due to poor outcomes and moral issues(1,2),it is nowadays the most common indication for LT in Western countries(3,4).Patient and graft survival in this setting are excellent(5).However,relapse rates remain high(6),which jeopardizes long-term survival and the acceptance of the transplant team for these *** evaluation of the suitability to a LT for a potential candidate is therefore *** length of sobriety,namely over six months,has longtime been considered as the condition sine qua ***“6-month rule”is insufficient to predict the risk of relapse and is progressively being abandoned by learned societies recommendations(7,8).Moreover,situations in which a recent alcohol consumption is obvious,such as alcoholic hepatitis or positive blood and/or urine test before the procedure,are associated with good outcomes(9-11).

关键词： alcohol liver urine

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

引用

Asian Pacific Journal of Tropical Medicine 2010年第2期3卷 141-144页

作者： Gyuse AN Bassey IE Udonwa ne Okokon IB Philip-Ephraim EE Department of Family Medicine University of Calabar Teaching Hospital Department of Pathology University of Calabar Teaching Hospital Department of Internal Medicine University of Calabar Teaching Hospital

Objective:To determine the causes of death among human immunodeficiency virus/acquired immunodeficiency syndrome(HIV/AIDS) patients as a step to planning strategies to improve mortality from this ***:This study retrospectively analyzed the mortality pattern of adult HIV/AIDS patients in the University of Calabar Teaching Hospital from January 2005 to December *** data were obtained from sexually transmitted infection/acquired immunodeficiency syndrome(STI/AIDS) clinic register,admissions and discharge/death registers as well as the patients’ case records and the hospitals monthly mortality *** obtained included age,sex,diagnosis and cause(s) of *** causes of death considered were the direct causes of death,since the originating antecedent cause of death is the same in all the patients,in this case,HIV/*** was analysed using Epi Info ***:The total number of mortalities during the study period was 350,100 were HIV positive representing 28.6%of all *** advanced HIV/AIDS disease was the leading cause of death in our study representing 27.0%,tuberculosis was the single leading cause of deaths in HIV/AIDS patients constituting about 24.0%of *** was followed by sepsis and septicaemia(13.0%), meningitis and encephalitis,and anaemia accounting for 11.0%,while respiratory diseases constituted 5.0%of the mortality *** highest number of deaths occurred in those aged between 21-50 years(82.0%).Conclusions:The study has shown that HIV/AIDS is a major cause of morbidity and mortality in our *** causes of death reflect the varied spectrum of infection and other forms of organ involvement that affect HIV/AIDS *** present dismal situation of adult patients living with HIV/AIDS calls for enhanced strategies to decrease the mortality trend observed in Nigeria and sub-Saharan Africa.

关键词： Mortality Pattern HIV/AIDS Adult Patients Tertiary health institution

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

Gustav Klimt, 1862-1918

Gustav Klimt, 1862-1918

引用

作者： Gilles ne?ret.

来源：南通市图书馆图书评论

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

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

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：