检索结果-南通市图书馆

Seasonal patterns in water uptake for Medicago sativa grown along an elevation gradient with shallow groundwater table in Yanchi county of Ningxia,Northwest China

引用

Journal of Arid Land 2016年第6期8卷 921-934页

作者： ZHU Lin ZHANG Huili gao xue QI Yashu XU Xing State Key Laboratory Breeding Base of Land Degradation and Ecological Restoration of North-western China Ningxia University Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem of North-western China Ministry of EducationNingxia University Agricultural College Ningxia University

Lucerne （Medicago sativa L.） is a deep-rooted perennial leguminous forage with high evapo-transpiration rate exceeding the annual precipitation in semi-arid areas of Northwest China. Groundwater might be the potential water sources of lucerne in the area with shallow groundwater table. In this study, stable isotopic compositions of oxygen and hydrogen （6180 and 8D） of different water sources and xylem sap were analyzed to determine the seasonal （April, June, July and August） and topographic （three slope positions） variations in water sources for lucerne growing in Ningxia eastern semi-arid area adjacent to Mu Us Desert characterized by shallow groundwater table. IsoSource software was used to calculate the probable contribution of different water sources to the total plant water uptake. Stomatal conductance, stem water potential, carbon isotope discrimination （A13C） of whole plant were also determined for evaluating the water status of lucerne growing at different slope positions. The results showed that soil water content increased as the elevation decreased. Oxygen compositions of soil water in the 0-40 cm profile fluctuated considerably. Soil water 8180 values in deep profile （〉3.5 m） were similar to those in groundwater, implying the recharge of groundwater to this soil layer. Highest water utilization rate from deep soil profile （below 350 cm） was recorded for lucerne grown at the slope position 1 （groundwater table depth of 3.5-3.9 m） in April, June and July. The lucernes at slope position 2 （groundwater table depth of 5.8-6.4 m） and slope position 3 （groundwater table depth 7.1-8.3 m） mostly used water from deep soil layers （below 350 cm） during dry period, and turned to use water from superficial soil layer in wet period. Higher yield, A13C value of whole plant and stomatal conductance were observed for lucerne grown at the slope position 1 than those at other slope positions. These results indicated that groundwater is a significant water source for transpi

关键词： lucerne water uptake groundwater table oxygen and hydrogen isotopic compositions evapo-transpiration

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 Ce on Inclusions and Impact Property of 2Cr13 Stainless Steel

引用

Journal of Iron and Steel Research International 2010年第12期17卷 59-64页

作者： LIU Xiao YANG Ji-chun YANG Lin gao xue-zhong Metallurgy Department Central Iron and Steel Research Institute Beijing 100081 China Materials and Metallurgy School Inner Mongolia University of Science and Technology Baotou 014010 Inner Mongolia China Engineering and Technology Division Advanced Technology and Materials Limited Company Beijing 100081 China The First Steelmaking Plant Angang Steel Company Limited Anshan 114021 Liaoning China

The effect of Ce on inclusions and impact toughness of 2Cr13 stainless steel were studied by SEM and electron spectroscopy. Thermodynamic calculation was used to analyze the formation of RE inclusions in 2Cr13 stainless steel. The result shows that Al2 O3 and MnS can be entirely replaced by Ce2 O2 S and CeS. Fracture is changed from cleavage to ductile fracture by adding Ce to the 2Cr13 stainless steel, and the spherical rare earth oxysulfide inclusions （Ce2 O2 S） in the dimple are the main factors. The transverse impact value of 2Cr13 stainless steel has been improved obviously by Ce. The transverse impact value of RE-2Cr13 is increased by 54.55% at the temperature of --40℃, comparing with 0RE-2Cr13.

关键词： rare earth 2Cr13 stainless steel inclusion thermodynamic calculation impact property

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

Climate change projection over the Tibetan Plateau based on a set of RCM simulations

引用

Advances in Climate Change Research 2021年第3期12卷 313-321页

作者： FU Yuan-Hai gao xue-Jie ZHU Ying-Mo GUO Dong Climate Change Research Center Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science&TechnologyNanjing210044China University of Chinese Academy of Sciences Beijing100049China Department of Atmospheric Sciences Yunnan UniversityKunming650504China

Tibetan Plateau(TP,with the height>3000 m)is a region with complex topographical features and a large diversity of climate both in space and *** use of higher resolution regional climate models(RCMs)to downscale global climate model simulations is of high *** the present study,future climate change over TP and the surrounding areas is investigated based on the ensemble of a set of the 21st century climate change projections using the RCM *** model is driven by five different GCMs at a grid spacing of 25 km under *** focus is on the December—January-February(DJF),June-July-August(JJA),and annual mean temperature and precipitation,with comparisons against the driving GCMs also ***,the RegCM4 greatly improves the simulation by providing finer scale spatial details of both temperature and precipitation distributions over the *** topographic effects are well reproduced by RegCM4 but not the *** the projected future changes,general wanning and increase in precipitation are found in both GCM and RegCM4 ***,substantial differences exist in both the spatial distribution and magnitude of the *** added value of RegCM4 for temperature,in addition to the finer spatial details,is characterized by a more pronounced warming in DJF over TP compared to its surrounding *** projected changes of precipitation show also differences between RegCM4 and the driving *** increase of precipitation is more pronounced and over the basins in DJF for RegCM4,and in general with a better agreement across the simulations compared to the driving GCMs.

关键词： Climate change Regional climate model Tibetan plateau

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

Impact of next-generation sequencing on molecular diagnosis of inherited non-syndromic hearing loss

引用

Journal of Otology 2014年第3期9卷 122-125页

作者： xue gao Pu Dai Department of Otolaryngology Head and Neck SurgeryPLA General Hospital Department of Otolaryngology Hainan Branch of PLA General Hospital Department of Otolaryngology the Second Artillery General Hospital

Hearing loss is one of the most common birth defects,with inherited genetic defects play an important role,contributing to about 60%of deafness occurring in ***,hearing impairment is genetically heterogeneous,with both common and rare forms occurring due to mutations in estimated 500 *** to the large number and presumably low mutation frequencies of those genes,it would be highly expensive and time-consuming to address this issue by conventional gene-by-gene Sanger ***-generation sequencing is a revolutionary technology that allows the simultaneous screening of mutations in a large number of *** is cost effective compared to classical strategies of linkage analysis and direct sequencing when the number or size of genes is large,and thus has become a highly efficient strategy for identifying novel causative genes and mutations involved in heritable *** this review, we describe major NGS methodologies currently used for genetic disorders and highlight applications of these technologies in studies of molecular diagnosis and the discovery of genes implicated in non-syndromic hearing loss.

关键词： Next-generation sequencing Molecular diagnosis Inherited non-syndromic hearing loss Whole genome sequencing Whole exome sequencing

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

动物遗传评估软件研究进展

引用

畜牧兽医学报 2024年第5期55卷 1827-1841页

作者：张元旭李竟王泽昭陈燕徐凌洋张路培高雪高会江李俊雅朱波郭鹏天津农学院计算机与信息工程学院天津300384 中国农业科学院北京畜牧兽医研究所北京100193

遗传评估软件在动物领域的应用极大地提高了育种工作效率。随着基因组测序技术不断完善和人工智能技术的兴起,动物遗传评估软件也得到了快速的发展。本文首先介绍了常规育种和基因组育种在动物育种领域的应用,然后重点回顾了GBLUP方法... 详细信息

遗传评估软件在动物领域的应用极大地提高了育种工作效率。随着基因组测序技术不断完善和人工智能技术的兴起,动物遗传评估软件也得到了快速的发展。本文首先介绍了常规育种和基因组育种在动物育种领域的应用,然后重点回顾了GBLUP方法、贝叶斯方法和机器学习以及深度学习方法的全基因组遗传评估软件的特点和发展历史,最后展望了计算机软件在动物遗传评估育种中的未来发展趋势,旨为动物育种领域的研究人员提供相关遗传评估软件的参考。

关键词：动物遗传评估软件研究进展常规育种全基因组育种贝叶斯方法 GBLUP 机器学习

来源：

维普期刊数据库博看期刊

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

基于CiteSpace的中国污水处理智能控制领域的研究热点与趋势分析

引用

四川环境 2024年第2期43卷 132-138页

作者：阳鑫张劲冯学高刘志湖北大学资源环境学院武汉430062 湖北大学生态文明建设研究院武汉430062 荆门市生态环境局沙洋分局湖北荆门448200 湖北省生态环境监测中心站武汉430061

为了解我国污水处理过程中智能控制领域的发展现状,厘清该研究领域的热点问题与趋势,通过中国知网数据库,检索了1992—2022年有关污水处理过程中智能控制领域的1688篇研究论文,基于文献计量学,从作者、机构及关键词等方面,应用CiteSpac... 详细信息

为了解我国污水处理过程中智能控制领域的发展现状,厘清该研究领域的热点问题与趋势,通过中国知网数据库,检索了1992—2022年有关污水处理过程中智能控制领域的1688篇研究论文,基于文献计量学,从作者、机构及关键词等方面,应用CiteSpace软件对检索的1688篇文献进行可视化分析,得到相关的知识图谱。结果表明:(1)我国污水处理智能控制研究经历了初步探索阶段、快速发展阶段、波动型发展阶段,波动情况主要受到污水治理政策调控。(2)在污水处理过程的智能化控制研究领域中,北京工业大学的乔俊飞和韩红桂对该领域影响力最大,形成了以北京工业大学为中心的污水处理智能控制科研集聚。(3)污水处理过程中控制技术究热点主要包括基于物联网技术的远程监控和基于遗传算法、粒子群等算法优化神经网络的水质参数软测量以及污水处理过程中的故障诊断,其中,神经网络、模糊控制和遗传算法在污水处理智能控制控制技术中占据主导地位。除此之外,对于污水处理过程中的溶解氧的智能控制是该领域的重要研究课题。

关键词：污水处理智能控制 CiteSpace 文献计量

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

机器学习全基因组选择研究进展

引用

畜牧兽医学报 2024年第6期55卷 2281-2292页

作者：李竟张元旭王泽昭陈燕徐凌洋张路培高雪高会江李俊雅朱波郭鹏天津农学院计算机与信息工程学院天津300384 中国农业科学院北京畜牧兽医研究所北京100193

机器学习方法是全基因组选择研究的重要分支,深度学习是近年来机器学习领域新的研究热点。本文介绍了机器学习以及深度学习全基因组选择研究的原理和应用发展,分别从模型框架、模型参数、特征选择等方面对深度学习全基因组育种值估计研... 详细信息

机器学习方法是全基因组选择研究的重要分支,深度学习是近年来机器学习领域新的研究热点。本文介绍了机器学习以及深度学习全基因组选择研究的原理和应用发展,分别从模型框架、模型参数、特征选择等方面对深度学习全基因组育种值估计研究进展进行了阐述,探讨了深度学习全基因组选择研究中面临的一些的问题,并对未来进行了展望。

关键词：全基因组选择研究进展机器学习深度学习原理与应用

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

美国牙髓病学专科教育体系对我国牙体牙髓病学专科建设的借鉴意义

引用

牙体牙髓牙周病学杂志 2024年第9期29卷 497-503页

作者：田福聪王晓燕高学军北京大学口腔医学院·口腔医院牙体牙髓科国家口腔医学中心国家口腔疾病临床医学研究中心口腔生物材料和数字诊疗装备国家工程研究中心北京100081 美国弗吉尼亚联邦大学牙学院牙髓病科美国里士满23298

我国社会经济的发展推动了口腔医学专科的建立与发展,但如何发展并无经验可循。美国在牙科专科的认定与管理方面有长期而成熟的制度。本文第一作者分别接受过中美两个体系的牙体牙髓病学专科训练,曾分别任教于中美两国的牙学院。本文目... 详细信息

我国社会经济的发展推动了口腔医学专科的建立与发展,但如何发展并无经验可循。美国在牙科专科的认定与管理方面有长期而成熟的制度。本文第一作者分别接受过中美两个体系的牙体牙髓病学专科训练,曾分别任教于中美两国的牙学院。本文目的在于结合美国牙科协会下属委员会负责的牙科专科申请与认定标准,美国牙髓专科医师的培养现状与包括教育机构、师资及课程设置等方面的具体培养要求等,探讨如何借鉴或参考美国的经验,形成符合中国国情的牙体牙髓病学专科医生培训体系。作者认为,培养后的专科医师认证制度对整个培养体系必不可缺,规范的转诊制度是专科医师有效服务的重要保证。以此为基础,回顾我国的牙体牙髓专科教育与培训体制,期望本文为进一步明确专科定义,完善专科培养制度并最终建立规范且符合社会实际需求的专科医师体系提供借鉴。

关键词：牙体牙髓病学牙髓病学专科教育专科认证转诊制度

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 convective parameterizations in RegCM4 experiments over China with CLM as the land surface model

引用

Atmospheric and Oceanic Science Letters 2016年第4期9卷 246-254页

作者： gao xue-Jie SHI Ying Filippo GIORGI Climate Change Research Center Institute of Atmospheric Physics Chinese Academy of Sciences National Climate Center China Meteorological Administration The Abdus Salam International Centre for Theoretical Physics

in the latest version of the international Centre for Theoretical Physics＇ regional climate model, RegCM4, CLM was introduced as a new land surface scheme. The performance over China of RegCM4-CLM with different convection schemes is analyzed in this study, based on a series of short- term *** model is driven by ERA-Interim data at a grid spacing of 25 *** convection schemes employed are： Emanuel; Grell; Emanuel over land and Grell over ocean; Grell over land and Emanuel over ocean; and Tiedtke. The simulated mean surface air temperature and precipitation in December-February-January and June-July-August are compared against observation. In general, better performance of Emanuel is found both for temperature and precipitation, and in both seasons. Thus, the model physics of CLM and Emanuel for the land surface processes and convection, respectively, are recommended for further application of RegCM4 over the China region. The de^ciencies that remain in the model arealso outlined and discussed.

关键词： Regional climate model China RegCM4 temperatureprecipitation

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 Primal-Dual Interior-Point Method for Optimal Grasping Manipulation of Multi-fingered Hand-Arm Robots

引用

Journal of the Operations Research Society of China 2017年第2期5卷 177-192页

作者： Yan-Qin Bai xue-Rui gao Chang-Jun Yu Department of Mathematics Shanghai UniversityShanghai 200444China

In this paper,we consider an optimization problem of the grasping manipulation of multi-fingered hand-arm *** first formulate an optimization model for the problem,based on the dynamic equations of the object and the friction con***,we reformulate the model as a convex quadratic programming over circular ***,we propose a primal-dual interior-point algorithm based on the kernel function to solve this convex quadratic programming over circular *** derive both the convergence of the algorithm and the iteration bounds for largeand small-update methods,***,we carry out the numerical tests of 180◦and 90◦manipulations of the hand-arm robot to demonstrate the effectiveness of the proposed algorithm.

关键词： Grasping manipulation Circular cone programming Primal-dual interior-point algorithm Numerical tests

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：