检索结果-南通市图书馆

Impacts of.degrading permaf.ost on streamf.ow in the source area of.Yellow River on the Qinghai-Tibet Plateau,China

Advances in Climate Change Research 2019年第4期10卷 225-239页

作者： MA Qiang JIN Hui-Jun victor f.BENSE LUO Dong-Liang Sergey S.MARCHENKO Stuart A.HARRIS LAN Yong-Chao State Key Laboratory of.f.ozen Soils Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou730000China College of.Resources and Environment University of Chinese Academy of SciencesBeijing100049China School of.Civil Engineering Harbin Institute of TechnologyHarbin150090China Hydrology and Quantitative Water Management Group Department of Environmental SciencesWageningen UniversityWageningen6708PBthe Netherlands Geophysical Institute(GIPL) University of Alaska FairbanksFairbanks99775USA Department of.Geography University of CalgaryCalgaryT3A 1E4Canada

Many observations in and model simulations f.r northern basins have conf.rmed an increased streamf.ow f.om degrading permaf.ost,while the streamf.ow has declined in the source area of.the Yellow River(SAYR,above the Tanag hydrological station)on the northeastern Qinghai-Tibet Plateau,West *** and to what extent does the degrading permaf.ost change the f.ow in the SAYR?According to seasonal regimes of.hydrological processes,the SAYR is divided intof.ur sub-basins with varied permaf.ost extents to detect impacts of.permaf.ost degradation on the Yellow River *** show that permaf.ost degradation may have released appreciable meltwater f.r recharging *** potential release rate of.ground-ice melt-water in the Sub-basin 1(the headwater area of.the Yellow River(HAYR),above the Huangheyan hydrological station)is the highest(5.6 mm per year),contributing to 14.4%of.the annual Yellow River streamf.ow at ***/intra-and annual shif.s of.streamf.ow,a possible signal f.r the marked alteration of.hydrological processes by permaf.ost degradation,is observed in the HAYR,but the shif.s are minor in other sub-basins in the *** hydraulic connectivity is expected to occur during and af.er certain degrees of.permaf.ost *** impacts of.permaf.ost degradation on the annual Yellow River streamf.ow in the SAYR at Tanag,i.e.,f.om the meltwater of.ground-ice,is estimated at 4.9%that of.the annual Yellow River discharge at Tanag,yet with a high uncertainty,due to neglecting of.the improved hydraulic connections f.om permaf.ost degradation and the f.ow generation conditions f.r the ground-ice *** evapotranspiration,substantial weakening of.the Southwest China Autumn Rain,and anthropogenic disturbances may largely account f.r the declined streamf.ow in the SAYR.

关键词： Streamf.ow Warming climate Permaf.ost degradation Streamf.ow patterns Source area of.Yellow River(SAYR)

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

超高功率体放电的形成及其应用(英文)

引用

光学精密工程 2011年第2期19卷 273-283页

作者： tarasenko V f.BAKSHT E KH BURACHENKO A G LOMAEV M I RYBKA D V SHULEPOV M A SOROKIN D A SHUT'KO V High Current Electronics Institute

研究了氮气中的高压体（扩散）放电特性,实验中施加的极间隙脉冲电压达数百千伏,持续时间为数纳秒,上升时间为几个纳秒,给出了实验结果。研究了氦气压强为（0.42）×10^5Pa时,从扩散形式到火花放电的放电转换过程。确定了在氮气压强下... 详细信息

研究了氮气中的高压体（扩散）放电特性,实验中施加的极间隙脉冲电压达数百千伏,持续时间为数纳秒,上升时间为几个纳秒,给出了实验结果。研究了氦气压强为（0.42）×10^5Pa时,从扩散形式到火花放电的放电转换过程。确定了在氮气压强下电流幅度与逃逸电子束电流脉宽的关系。结果表明,导致隙间扩散放电的超短雪崩电子束（SAEB）对放电过程有重要的影响。在该压强下得出了SAEB瞬间产生相对放电电流的时延与压强的关系,根据该关系,时延随着压强增加而变化,并且在压强为2×10^5Pa时最小,同时扩散放电电流脉冲的峰值随压强增加而减小。在0.5×10^5Pa的压强下,使用刀片电极和6 cm长的N2∶Sf.=10∶1的激活媒质,得到了输出能量为2 mJ、脉冲功率为0.55 MW的激光。最后,在大气压强下,对AlBe箔片进行了重复频率放电处理（REP）,其表层清除了碳而且氧原子以450 nm/300pulse渗入箔片。

关键词：体放电扩散放电非均匀电场逃逸电子紫外激光器修饰及清洁

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

Ef.ectiveness of.Metanx Prescription Medical f.od on Small Nerve f.bers and Monof.lament Sensation in Patients with Diabetic Peripheral Polyneuropathy

引用

Journal of.Diabetes Mellitus 2016年第2期6卷 166-174页

作者： victor f. McNamara Aaron I. Vinik Lori Barrentine Edward B. De Vol Central f.orida f.ot & Ankle Specialists PA Orlando FL USA Eastern Virginia Medical School Norfolk VA USA Nestlé Health Science-Pamlab Inc. Covington LA USA D & D Statistical Consultants Dallas TX USA

Purpose: Diabetic peripheral neuropathy (DPN) is prevalent among the population with type 2 diabetes, and treatment approaches are limited. The combination of.L-methylf.late-methylcobalamin-pyridoxal-5-phospate (LMf.MC-PP, Metanx?) is a prescription medical f.od that has demonstrated signif.cant improvements in sensory perception and quality of.lif. as well as reduced neuropathic pain in patients with DPN. The present study examined the ef.ects of.LMf.MC-PP on sensory perception and epidermal nerve f.ber density (ENf.) among patients with conf.rmed DPN. Methods: Patients with type 2 diabetes and diagnosed with diabetic peripheral polyneuropathy, based on loss of.vibratory perception, warm-cold discrimination or monof.lament sensation, underwent bilateral lower extremity ENf. assessments via skin punch biopsy and were started on LMf.MC-PP. ENf. and monof.lament testing were repeated at 6 months. f.ndings: Of.123 patients evaluated, all had monof.lament testing at baseline and 6 months and 122 had assessments at both time points. A signif.cant (p f. f.om baseline to 6 months was observed. A signif.cant (p = 0.0001) improvement in monof.lament testing also was observed. Overall, more patients had intact sensation af.er 6 months, with 60 (48.8%) of.123 patients having positive monof.lament test at baseline as compared to 95 (77.2%) positive af.er 6 months. An analysis of.the association between improvements in ENf. and monof.lament testing f.und that the two tended to occur together, and this was signif.cant (p f.r the right limb. Implications: Clinically important and statistically signif.cant improvements in ENf. and monof.lament sensation were associated with LMf.MC-PP in patients with DPN. When compared to the decrease in ENf. expected among DPN patients, the improvements are even more clinically signif.cant. These f.ndings should be validated in a larger, placebo-controlled study.

关键词： Diabetic Neuropathy Epidermal Nerve f.ber Density LMf.MC-PP Monof.lament Testing Small Nerve f.bers

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

Benchmarking graph neural networks f.r materials chemistry

引用

npj Computational Materials 2021年第1期7卷 739-746页

作者： victor f.ng Jiaxin Zhang Eric Juarez Bobby G.Sumpter Center f.r Nanophase Materials Sciences Oak Ridge National LaboratoryOak RidgeTNUnited States Computer Science and Mathematics Division Oak Ridge National LaboratoryOak RidgeTNUnited States

Graph neural networks(GNNs)have received intense interest as a rapidly expanding class of.machine learning models remarkably well-suited f.r materials *** date,a number of.successf.l GNNs have been proposed and demonstrated f.r systems ranging f.om crystal stability to electronic property prediction and to surf.ce chemistry and heterogeneous ***,a consistent benchmark of.these models remains lacking,hindering the development and consistent evaluation of.new models in the materials ***,we present a workf.ow and testing platf.rm,MatDeepLearn,f.r quickly and reproducibly assessing and comparing GNNs and other machine learning *** use this platf.rm to optimize and evaluate a selection of.top perf.rming GNNs on several representative datasets in computational materials *** our investigations we note the importance of.hyperparameter selection and f.nd roughly similar perf.rmances f.r the top models once *** identif. several strengths in GNNs over conventional models in cases with compositionally diverse datasets and in its overall f.exibility with respect to inputs,due to learned rather than def.ned *** several weaknesses of.GNNs are also observed including high data requirements,and suggestions f.r f.rther improvement f.r applications in materials chemistry are discussed.

关键词： f.eld chemistry intense

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

纳秒、皮秒和飞秒激光脉冲对材料表面的改性(英文)

引用

光学精密工程 2011年第2期19卷 221-227页

作者： TRTICAM S GAKOVIC B M RADAK B B BATANI D tarasenko V f.PETROVIC S STASIC J MILOVANOVIC D KRMPOT A JELENKOVIC B VINCA Institute of.Nuclear Sciences University of Belgrade P.O. BOX 522 11001 Belgrade Serbia Universita degli Studi di Milano Bicocca Piazza della Scienza 3 20126 Milano Italy High Current Electronics Institute SB of.RAS 634055 Tomsk Russia Institute of.Physics P.O. BOX 57 11001 Belgrade Serbia

对基体材料镉镍铁合金600和多层TiAlN/TiN涂层的激光表面改性在基础研究和实际应用中有着很好的前景。本文观察了由超短脉冲(f.和ns)和短脉冲(ns)激光器引起的镉镍铁合金600和TiAlN/TiN镀层的表面变化。结果显示,3种激光都能使靶面发生... 详细信息

对基体材料镉镍铁合金600和多层TiAlN/TiN涂层的激光表面改性在基础研究和实际应用中有着很好的前景。本文观察了由超短脉冲(f.和ns)和短脉冲(ns)激光器引起的镉镍铁合金600和TiAlN/TiN镀层的表面变化。结果显示,3种激光都能使靶面发生形态改变,超短脉冲的破坏轮廓更为清晰。与ps激光脉冲相比,f.激光脉冲能产生更严重的破坏。与产生半球体形状的ps激光束相反,f.激光脉冲产生的破坏斑是圆锥形的。另外,ns脉冲辐照时热效应占支配地位,且所有的辐照都伴随着等离子体。

关键词：纳秒脉冲皮秒脉冲飞秒脉冲 Inconel 600镀层 TiAlN/TiN镀层激光改性

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

Proteome changes of.porcine f.llicular f.uid during f.llicle development

引用

Journal of.Animal Science and Biotechnology 2020年第2期11卷 367-379页

作者： victor M.Paes Shengf. f.Liao Jose R.f.gueiredo Scott T.Willard Peter L.Ryan Jean M.f.ugang Department of.Animal and Dairy Sciences Mississippi State University4025 Wise CenterPO Box 9815StarkvilleMississippi State MS 39762USA Laboratory of.Manipulation of.Oocyte and Preantral f.llicles State University of CearáFortalezaCEBrazil

Background:Ovarian f.llicular f.uid inf.uences f.llicle and oocyte growth,but the f.uctuation of.its protein content during f.lliculogenesis has not been comprehensively *** we used a shotgun approach and bioinf.rmatics analyses to investigate and compare the proteomes of.porcine f.llicular f.uid(pf.)obtained f.om small(6–12 mm)***:f.llicular f.uid samples containing highest estrogen levels were selected as non-atretic f.om small(SNA:26.1±15 ng/mL),medium(MNA:162±54 ng/mL),and large(LNA:290±37 ng/mL)f.llicles f.r proteomic *** detected 1627,1699,and 1756 proteins in SNA,MNA,and LNA samples,*** 60–63%of.total proteins were specif.c to each sample,11–13%were shared in pairwise comparisons,and 247 proteins were shared among all *** categorization indicated comparable gene ontology(GO)terms distribution per cellular component,molecular f.nction,and biological process categories across samples;however,the ranking of.highly signif.cantly enriched GO terms per category revealed dif.erences between *** patterns of.proteinto-protein interactions varied throughout f.llicle development,and proteins such as serine protease inhibitor,clade E(SERPINE);plasminogen activator,urokinase(PLAU);and plasminogen activator,urokinase receptor(PLAUR)appeared stage-specif.c to SNA,MNA,and LNA,***“complement and coagulation cascades”was the common major ***,properdin and f.bulin-1 were abundant proteins that appeared absent in LNA ***:This study provides extensive and f.nctional analyses of.the pf. proteome changes during f.lliculogenesis and of.ers the potential f.r novel biomarker discovery in pf. f.r oocyte quality assessment.

关键词： f.llicular f.uid f.lliculogenesis Pig Shotgun proteomic

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

A Prepaid Smart Metering Scheme Based on WiMAX Prepaid Accounting Model

引用

Smart Grid and Renewable Energy 2010年第2期1卷 63-69页

作者： Reduan H. Khan Tanzim f. Aditi victor Sreeram Herbert H. C. Iu 不详

Prepaid energy meters have been widely adopted by utilities in dif.erent countries across the world as an innovative solution to the problem of.af.ordability and consumption management. However, the present smart card based systems have some inherent problems like added cost, low availability and lack of.security. In the f.ture Smart Grid paradigm, use of.smart meters can completely overhaul these prepaid systems by introducing centralized accounting, monitoring and credit-control f.nctions using state-of.the-art telecommunication technologies like WiMAX. In this paper we pro-pose a prepaid smart metering scheme f.r Smart Grid application based on centralized authentication and charging using the WiMAX prepaid accounting model. We then discuss its specif.c application to Demand Response and Roam-ing of.Electrical Vehicles.

关键词： Smart Metering WiMAX Smart Grid Demand Response Electric Vehicles

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

Theoretical study of.def.ct impact on two-dimensional MoS_2

引用

Journal of.Semiconductors 2015年第12期36卷 18-23页

作者： Anna V.Krivosheeva victor L.Shaposhnikov victor E.Borisenko Jean-Louis Lazzari Chow Waileong Julia Gusakova Beng Kang Tay Belarusian State University of.Inf.rmatics and Radioelectronics CNRS Aix-Marseille Université NOVITAS Nanoelectronics Centre of Excellence School of Electrical and Electronic Engineering Nanyang Technological University CINTRA CNRS NTUTHALES Nanyang Technological University

Our theoretical f.ndings demonstrate f.r the f.rst time a possibility of.band-gap engineering of.monolayer MoS2 crystals by oxygen and the presence of.vacancies. Oxygen atoms are revealed to substitute sulf.r ones, f.rming stable MoS2-xOx ternary compounds, or adsorb on top of.the sulf.r atoms. The substituting oxygen provides a decrease of.the band gap f.om 1.86 to 1.64 eV and transf.rms the material f.om a direct-gap to an indirect-gap semiconductor. The surf.ce adsorbed oxygen atoms decrease the band gap up to 0.98 eV depending on their location tending to the metallic character of.the electron energy bands at a high concentration of.the adsorbed atoms. Oxygen plasma processing is proposed as an ef.ective technology f.r such band-gap modif.cations.

关键词： two-dimensional crystal molybdenum disulf.de band gap vacancy oxygen

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

Geomechanical analysis of.the inf.uence of.CO2 injection location on f.ult stability

引用

Journal of.Rock Mechanics and Geotechnical Engineering 2016年第6期8卷 805-818页

作者： victor Vilarrasa Roman Makhnenko Sohrab Gheibi école Polytechnique f.dérale de Lausanne LausanneSwitzerland Institute of.Environmental Assessment and Water Research(IDAEA-CSIC) BarcelonaSpain Associated Unit:Hydrogeology Group(UPC-CSIC) BarcelonaSpain Department of.Civil&Environmental Engineering University of Illinois at Urbana-ChampaignUSA Norwegian University of.Science and Technology TrondheimNorway

Large amounts of.carbon dioxide(CO2) should be injected in deep saline f.rmations to mitigate climate change,implying geomechanical challenges that require f.rther *** build-up induced by CO2injection will decrease the ef.ective stresses and may af.ect f.ult *** ef.ects of.overpressure induced by CO2injection either in the hanging wall or in the f.ot wall on f.ult stability are ***2injection in the presence of.a low-permeable f.ult induces pressurization of.the storage f.rmation between the injection well and the *** low permeability of.the f.ult hinders f.uid f.ow across it and leads to smaller overpressure on the other side of.the *** variability in the f.uid pressure distribution gives rise to dif.erential total stress changes around the f.ult that reduce its *** a signif.cant pressure build-up induced by the f.ult,caprock stability around the injection well is not compromised and thus,CO2leakage across the caprock is unlikely to *** decrease in f.ult stability is similar regardless of.the side of.the f.ult where CO2is *** results show that f.ult core permeability has a signif.cant ef.ect on f.ult stability,becoming less af.ected f.r high-permeable *** appropriate pressure management will allow storing large quantities of.CO2without inducing f.ult reactivation.

关键词： Carbon dioxide(CO_2) injection Geomechanics f.ult stability Induced seismicity f.ult permeability

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

Automatic Detection of.COVID-19 Inf.ction Using Chest X-Ray Images Through Transf.r Learning

引用

IEEE/CAA Journal of.Automatica Sinica 2021年第1期8卷 239-248页

作者： Elene f.rmeza Ohata Gabriel Maia Bezerra João victor Souza das Chagas Aloísio Vieira Lira Neto Adriano Bessa Albuquerque victor Hugo Cde Albuquerque Pedro Pedrosa Rebouças f.lho the Universidade f.deral do Ceará FortalezaCE 60455-970and also with the Instituto Federal do CearáFortalezaCE 60040-215Brazil the Instituto f.deral do Ceará FortalezaCE 60040-215Brazil the Universidade de f.rtaleza FortalezaCE 60811-905Brazil

The new coronavirus(COVID-19),declared by the World Health Organization as a pandemic,has inf.cted more than 1 million people and killed more than 50 *** inf.ction caused by COVID-19 can develop into pneumonia,which can be detected by a chest X-ray exam and should be treated *** this work,we propose an automatic detection method f.r COVID-19 inf.ction based on chest X-ray *** datasets constructed f.r this study are composed of.94 X-ray images of.patients diagnosed with coronavirus and 194 X-ray images of.healthy *** f.w images of.patients with COVID-19 are publicly available,we apply the concept of.transf.r learning f.r this *** use dif.erent architectures of.convolutional neural networks(CNNs)trained on Image Net,and adapt them to behave as f.ature extractors f.r the X-ray ***,the CNNs are combined with consolidated machine learning methods,such as k-Nearest Neighbor,Bayes,Random f.rest,multilayer perceptron(MLP),and support vector machine(SVM).The results show that,f.r one of.the datasets,the extractor-classif.er pair with the best perf.rmance is the Mobile Net architecture with the SVM classif.er using a linear kernel,which achieves an accuracy and an f.-score of.98.5%.f.r the other dataset,the best pair is Dense Net201 with MLP,achieving an accuracy and an f.-score of.95.6%.Thus,the proposed approach demonstrates ef.iciency in detecting COVID-19 in X-ray images.

关键词： Convolutional neural networks(CNNs) COVID-19 transf.r learning X-ray

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：