检索结果-南通市图书馆

The Changing Cold Regions Network:Observation,diagnosis and prediction of environmental change in the Saskatchewan and mackenzie River Basins,Canada

引用

Science China Earth Sciences 2015年第1期58卷 46-60页

作者： chris m debeer Howard S WHEATER William L QUINTON Sean K CAREY Ronald E STEWART murray D mACKAY Philip mARSH Global Institute for Water Security University of SaskatchewanNational Hydrology Research Centre Cold Regions Research Centre Wilfrid Laurier University School of Geography and Earth Sciences Mc Master University Department of Environment and Geography University of Manitoba Science and Technology Branch Environment Canada

Climate change is causing rapid and severe changes to many Earth systems and processes,with widespread cryospheric,ecological,and hydrological impacts globally,and especially in high northern *** is of major societal concern and there is an urgent need for improved understanding and predictive tools for environmental *** Changing Cold Regions Network(CCRN)is a Canadian research consortium with a focus to integrate existing and new experimental data with modelling and remote sensing products to understand,diagnose,and predict changing land,water,and climate,and their interactions and feedbacks over the geographic domain of the mackenzie and Saskatchewan River Basins in *** network operates a set of 14 unique and focused Water,Ecosystem,Cryosphere and Climate(WECC)observatories within this region,which provide opportunities to observe and understand processes and their interaction,as well as develop and test numerical simulation models,and provide validation data for remote sensing *** paper describes this network and its observational,experimental,and modelling *** overview of many of the recent Earth system changes observed across the study region is provided,and some local insights from WECC observatories that may partly explain regional patterns and trends are *** of the model products being developed are discussed,and linkages with the local to international user community are reviewed—In particular,the use of WECC data towards model and remote sensing product calibration and validation is *** future activities and prospects for the network are also presented at the end of the paper.

关键词： climate change cryosphere hydrology atmospheric science ecology modelling Canada

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

Attitude control of multi-spacecraft systems on SO(3)with stochastic links failure

引用

Chinese Journal of Aeronautics 2024年第3期37卷 320-331页

作者： KANG Zeyu SHEN Qiang WU Shufan chris J.DAmAREN mU Zhongcheng School of Aeronautics and Astronautics Shanghai Jiao Tong UniversityShanghai 200240China Institute for Aerospace Studies University of TorontoTorontoOntario M3H 5T6Canada

In this paper,for multi-Spacecraft System(mSS)with a directed communication topology link and a static virtual leader,a controller is proposed to realize attitude consensus and attitude stabilization with stochastic links failure and actuator ***,an mSS attitude error model suitable for a directed topology link and with a static virtual leader based on SO(3)is derived,which considers that the attitude error on SO(3)cannot be defined based on algebraic ***,we design a controller to realize the mSS on SO(3)with attitude consensus and attitude stabilization under stochastic links failure and actuator ***,the simulation results of a multi-spacecraft system with stochastic links failure and a static virtual leader spacecraft are demonstrated to illustrate the efficiency of the attitude controller.

关键词： multi-spacecraft systems Attitude consensus Attitude stabilization Stochastic links failure Super-martingale convergence

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

Unprecedented JWST Observations Contest Cosmological Canons

引用

Engineering 2024年第6期37卷 6-9页

作者： chris Palmer Senior Technology Writer

After more than 18 months of nearly flawless operation,the James Webb Space Telescope(JWST)continues to deliver amazement,making unexpected discoveries,adding new wrinkles to known phenomena,and calling into question long-held theories of how the universe works.“The instruments are working amazingly well,in essentially all cases better than expected,”said Garth Illingworth,professor emeritus of astronomy and astrophysics at the University of California,Santa Cruz(CA,USA),and one of the three originators of the mission over three decades ago.“It has exceeded every one of its performance requirements,which is truly amazing when you think about how complex it is.”That complexity has included three decades of planning,design,and construction,followed by launch and maneuvering 1.5106 km from Earth to its second Lagrange(L2)orbit,unfolding and locking into position the 18 segments of its 6.5 m diameter main mirror,and deploying 8 motors,90 cables,and some 400 pulleys to unfurl its fragile sunshield[1,2].

关键词： universe Observation Cosmo

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

浮式海上风电助力可再生能源发展

引用

Engineering 2024年第4期35卷 1-3页

作者： chris Palmer Senior Technology Writer

Nearly 150 km off the coast of Norway,in one of the windiest places on Earth,stands Hywind Tampen,the world’s largest floating wind power *** weighing 8800 t and 190 m tall,with roughly one-third of that height sitting below the waterline,Hywind Tampen’s 11 turbines can generate 94.6 mW(Fig.1)[1].The blades—each 80 m long—travel at a blistering 290 km∙h–1,yet because of their size they complete only about 10 to 15 full rotations per minute.A single rotation provides enough electricity to power an average home for a ***,Hywind Tampen,which became fully operational in August 2023,will not power ***,the installation built by energy company Equinor(Stavanger,Norway)will provide 38%of the annual electricity consumed by five nearby offshore oil platforms in the North Sea[1].

关键词： rotation travel floating

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

Increasing Threat of Scarcity Prompts Rise in Water Recycling

引用

Engineering 2024年第2期33卷 6-8页

作者： chris Palmer Senior Technology Writer

In January 2018,construction wrapped on Salesforce Tower(Fig.1),a 61-story office building that now dominates the skyline of San Francisco,CA,*** addition to being the tallest building in the city,Salesforce Tower is the largest structure in the world with an onsite water recycling *** by the Australian com-pany Aquacell(milton,NSW,Australia),the system cleans 113 m^(3)of sewage,sink,shower,and other wastewater each day for use in irrigation and flushing toilets,saving an estimated 35000 m?of water anmually[1].The building is just one of dozens in San Fran-cisco outitted with their own water recycling systems,thanks to a city mandate enacted in 2015[1].

关键词： cycling wastewater recycling

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

Comparison of methods for deriving phenotypes from incomplete observation data with an application to age at puberty in dairy cattle

引用

Journal of Animal Science and Biotechnology 2024年第2期15卷 535-545页

作者： melissa A.Stephen chris R.Burke Jennie E.Pryce Nicole m.Steele Peter R.Amer Susanne meier Claire V.C.Phyn Dorian J.Garrick DairyNZ Ltd 605 Ruakura RoadHamilton 3240New Zealand AL Rae Centre for Genetics and Breeding-massey University RuakuraHamilton 3214New Zealand Agriculture Victoria Research AgriBioCentre for AgriBioscienceBundooraVictoria 3083Australia School of Applied Systems Biology La Trobe UniversityBundooraVictoria 3083Australia AbacusBio DunedinNew Zealand

Background many phenotypes in animal breeding are derived from incomplete measures,especially if they are challenging or expensive to measure *** include time-dependent traits such as reproductive status,or *** measures for these traits result in phenotypes that are subject to left-,interval-and rightcensoring,where phenotypes are only known to fall below an upper bound,between a lower and upper bound,or above a lower bound *** we compare three methods for deriving phenotypes from incomplete data using age at first elevation(>1 ng/mL)in blood plasma progesterone(AGEP4),which generally coincides with onset of puberty,as an example *** We produced AGEP4 phenotypes from three blood samples collected at about 30-day intervals from approximately 5,000 Holstein–Friesian or Holstein–Friesian×Jersey cross-bred dairy heifers managed in 54 seasonal-calving,pasture-based herds in New *** used these actual data to simulate 7 different visit scenarios,increasing the extent of censoring by disregarding data from one or two of the three *** methods for deriving phenotypes from these data were explored:1)ordinal categorical variables which were analysed using categorical threshold analysis;2)continuous variables,with a penalty of 31 d assigned to right-censored phenotypes;and 3)continuous variables,sampled from within a lower and upper bound using a data augmentation *** Credibility intervals for heritability estimations overlapped across all methods and visit scenarios,but estimated heritabilities tended to be higher when left censoring was *** sires with at least 5 daughters,the correlations between estimated breeding values(EBVs)from our three-visit scenario and each reduced data scenario varied by method,ranging from 0.65 to *** estimated breed effects also varied by method,but breed differences were smaller as phenotype censoring *** Our results indicate that using

关键词： Cattle Gibbs sampler markov-chain monte Carlo(mCmC) Puberty

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

Efficiency of a modular Cleanroom for Space Applications

引用

Fluid Dynamics & materials Processing 2024年第3期20卷 547-562页

作者： matthew R.Coburn Charlie Young chris Smith Graham Schultz miguel Robayo Zheng-Tong Xie Faculty of Engineering and Physical Sciences University of SouthamptonSouthamptonSO171BJUK Plastron UK Ltd. Westcott Venture ParkWestcottHP180XBUK Renewable Energy Group University of ExeterExeterTR109FEUK

A prototype cleanroom for hazardous testing and handling of satellites prior to launcher encapsulation,satisfying the ISO8 standard has been designed and analyzed in terms of *** Reynolds Averaged Navier-Stokes(URANS)models have been used to study the related flow field and particulate matter(Pm)*** outcomes of the URANS models have been validated through comparison with equivalent large-eddy *** attention has been paid to the location and shape of the air intakes and their orientation in space,in order to balance the Pm convection and diffusion inside the *** a cyclone-type flow pattern inside the cleanroom is a key to maintaining a high ventilation efficiency.

关键词： Diffuser LES Pm RANS unsteady flow exponential decay

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

A machine Learning Classification model for Detecting Prediabetes

引用

Journal of Data Analysis and Information Processing 2024年第3期12卷 462-478页

作者： A. K. m. Raquibul Bashar mahdi Goudarzi chris P. Tsokos Department of mathematics & Computer Science Augustana College Rock Island Illinois USA Independent Researcher San Francisco California USA Department of mathematics & Statistics University of South Florida Tampa Florida USA

The incidence of prediabetes is in a dangerous condition in the USA. The likelihood of increasing chronic and complex health issues is very high if this stage of prediabetes is ignored. So, early detection of prediabetes conditions is critical to decrease or avoid type 2 diabetes and other health issues that come as a result of untreated and undiagnosed prediabetes condition. This study is done in order to detect the prediabetes condition with an artificial intelligence method. Data used for this study is collected from the Centers for Disease Control and Prevention’s (CDC) survey conducted by the Division of Health and Nutrition Examination Surveys (DHANES). In this study, several machine learning algorithms are exploited and compared to determine the best algorithm based on Average Squared Error (ASE), Kolmogorov-Smirnov (Youden) scores, areas under the ROC and some other measures of the machine learning algorithm. Based on these scores, the champion model is selected, and Random Forest is the champion model with approximately 89% accuracy.

关键词： Prediabetes machine Learning SVm Forest Cumulative Lift

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

Anomalous thermal expansion and enhanced magnetocaloric effect in<001>-textured mn_(x)Fe_(5-x)Si_(3) alloys

引用

Rare metals 2024年第5期43卷 2263-2274页

作者： Yong Gong Xue-Fei miao Tapas Samanta chris Taake Jun Liu Feng-Jiao Qian Yan-Yan Shao Yu-Jing Zhang Qing-Yong Ren Luana Caron Feng Xu mIIT Key Laboratory of Advanced metallic and Intermetallic materials Technology School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing210094China Department of Physics Bielefeld University33501BielefeldGermany College of Physics Nanjing University of Aeronautics and AstronauticsNanjing210016China Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China Spallation Neutron Source Science Center Dongguan523803China Guangdong-Hong Kong-macao Joint Laboratory for Neutron Scattering Science and Technology Dongguan523803China Department of Physics Bielefeld University33501BielefeldGermany Helmholtz-Zentrum Berlin für Materialien und Energie12489BerlinGermany

The development of zero and negative therma expansion(i.e.,ZTE and NTE)materials is of crucial importance to the control of undesirable thermal expansion for high-precision *** the present work,ZTE and NTE were obtained in directionally-solidified mn_(x)Fe_(5-x)Si_(3)alloys with a strongtexture,in striking contrast to positive thermal expansion in their isotropic counterparts magnetometry and in-situ X-ray diffraction(XRD)measurements were performed to uncover the origin of the anomalous thermal *** measurements indicate a strong easy-plane magnetocrystalline anisotropy in the textured samples,where the magnetic moments are aligned within the ab plane of the hexagonal structure Temperature-dependent XRD on the x=1 sample reveals a ZTE character in the ab plane that is coupled to a ferromagnetic *** a result,the macroscopic ZTE(~0.22×10^(-6)K^(-1))in the x=1 sample can be attributed to the microscopic magneto volume effect within the ab plane,which is realized by the introduction of the-textured ***,the competition between antiferromagnetic and ferromagnetic exchange coupling leads to NTE in textured x=1.5 and 2 ***,textured x=1 sample displays enhanced magnetocaloric properties as compared to the conventional counterparts with randomly-oriented *** this work demonstrates a new strategy toward the exploration of anomalous thermal expansion properties as well as the enhancement of magnetocaloric properties for materials with a strong magnetocrystalline anisotropy.

关键词： mnFeySis magnetocaloric effect magnetic phase transition Negative thermal expansion

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

领导为何不公?领导不公行为的形成机理

引用

中国人力资源开发 2024年第1期41卷 112-124页

作者：陈思璇张春红段光卫旭华 chris m.Bell 南京理工大学经济管理学院南京210094 兰州大学管理学院兰州730000 湖南师范大学商学院长沙410081 约克大学舒立克商学院多伦多M3J1P3

领导不公行为是领导者违背公平准则的行为表现,对员工心理及行为的影响不容忽视。已有组织公平的研究广泛证实了领导不公行为对组织所造成的严重后果,但对领导不公行为的前因缺乏系统性的认知。为了全面系统地呈现领导不公行为形成的内... 详细信息

领导不公行为是领导者违背公平准则的行为表现,对员工心理及行为的影响不容忽视。已有组织公平的研究广泛证实了领导不公行为对组织所造成的严重后果,但对领导不公行为的前因缺乏系统性的认知。为了全面系统地呈现领导不公行为形成的内在逻辑,通过对相关文献的梳理,本文阐述了领导不公行为的内涵,对领导不公行为的相似构念进行了辨析,从道德正义理论、社会交换理论、态度功能理论、攻击性社会交互理论、自我损耗理论、自我概念维持理论的视角回顾了领导不公行为形成的理论解释,将领导不公行为归纳为不知而为的无意识不公以及知之而为的有意识不公两种基本模式。最后,从权威的视角切入,基于信息加工理论描述了领导者做出不公行为的信息加工过程,从自动化加工和系统化加工两方面详细讨论了领导不公行为的差异化形成机理,发展了一个形成机理模型。研究有助于推动领导不公行为的理论构建,为管理者做出有效的管理策略来减少领导不公行为提供实践启示。

关键词：领导不公行为信息加工理论组织公平

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：