检索结果-南通市图书馆

Low Root Zone Temperature Limits Nutrient Effects on Cucumber Seedling Growth and Induces Adversity Physiological Response

引用

Journal of Integrative Agriculture 2013年第8期12卷 1450-1460页

作者： yAN Qiu-yan DUAN Zeng-qiang MAO Jing-dong LI Xun dong Fei State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of Sciences Department of Chemistry and Biochemistry Old Dominion University Agricultural Bureau of Xiangfen County Shanxi Province

Effects of root-zone temperatures （RZT）（12℃-RZT and 20℃-RZT） and different N, P, and K nutrient regimes on the growth, reactive oxygen species （ROS）, and antioxidant enzyme in cucumber seedlings were investigated in hydroponics. Strong interactions were observed between RZT and nutrient on the dry weight （P=0.001）, root length （P=0.001） and leaf area （P=0.05）. Plant dry weights were suppressed at low RZT of 12℃, while higher biomass and growth of cucumber seedlings were produced at elevated RZT of 20℃ under each nutrient treatment. Growth indexes （plant height, internode length, root length, and leaf area） at 12℃-RZT had less difference among nutrient treatments, but greater response was obtained for different nutrients at high RZT. RZT had larger effects （P=0.001） on cucumber seedling growth than nutrients. In addition, N was more effective nutrients to plant growth than P and K under low root temperature to plant growth. Higher hydrogen peroxide （H202）, malondialdehyde （MDA）, soluble sugar （SS） contents in leaves were observed at 12℃-RZT in all nutrient treatments than those at 20℃-RZT, indicating the chilling adversity damaged to plant growth. In general, antioxidant enzyme had larger response under low root-zone temperature. Superoxide dismutase （SOD） activities were higher in both leaves and roots while peroxidase （POD） and catalase （CAT） showed large different action in leaves and roots at both the two root-zone temperature.

关键词： Cucumis sativus L. growth indexes antioxidant enzyme reactive oxygen

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

Advanced solar materials for thin-film photovoltaic cells

引用

Frontiers of physics 2011年第2期6卷 177-196页

作者： Fu-qiang HUAng Chong-yin y.ng dong-yun WAN College of Engineering and College of Chemistry and Molecular Engineering Peking University Beijing 100871 China CAS Key Laboratory of Materials for Energy Conversion Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou 215123 China

As one of the most promising solutions for the green energy, thin-film photovoltaic cell technology is still immature and far from large-scale industrialization. The major issue is getting low cost and stable module efficiency. To solve these problems, a large amount of advanced solar materials have been developed to improve all parts of solar cell modules. Here, some new solar material developments applied in different critical parts of chalcogenide thin-film photovoltaic cells are reviewed. The main efforts are focused on improving light trapping and antireflection, internal quantum efficiency and collection of photo-generated carriers.

关键词： thin-film solar cell thin films CIGS CdTe

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

Effect of Climate Variability and Human Activities on Runoff in the Jinghe River Basin, Northwest China

引用

Journal of Mountain Science 2015年第2期12卷 358-367页

作者： yAO Jun-qiang ZHAO Qiu-dong LIU Zhi-hui School of Resources and Environment Science Key Laboratory of Oasis Ecology of Ministry of Education Xinjiang University Xinjiang Climate Center Xinjiang Meteorological Administration Institute of Desert Meteorology China Meteorological Administration Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Institute of Arid Ecology and Environment Xinjiang University

Much attention has recently been focused on the effects of climate variability and human activities on the runoff. In this study, we analyzed 56-yr(1957–2012) runoff change and patterns in the Jinghe River Basin(JRB) in the arid region of northwest China. The nonparametric Mann–Kendall test and the precipitation-runoff double cumulative curve(PRDCC) were used to identify change trend and abrupt change points in the annual runoff. It was found that the runoff in the JRB has periodically fluctuated in the past 56 yr. Abrupt change point in annual runoff was identified in the JRB, which occurred in the years around 1964 and 1996 dividing the long-term hydrologic series into a natural period(1957 – 1964) and a climate and man-induced period(1965 – 1996 and 1997 – 2012). In the 1965 – 1996 period, human activities were the main factor that decreased runoff with contribution of 88.9%, while climate variability only accounted for 11.1%. However,the impact of climate variability has been increased from 11.1% to 47.5% during 1997 – 2012, showing that runoff in JRB is more sensitive to climate variability during global warming. This study distinguishes theeffect of climate variability from human activities on runoff, which can do duty for a reference for regional water resources assessment and management.

关键词： Water resource Runoff Climate variability Precipitation Jinghe River Basin

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

Dynamic modeling and analyzing of a walking robot

引用

The Journal of China Universities of Posts and Telecommunications 2014年第1期21卷 122-128页

作者： ZHUAng yu-feng LIU dong-qiang WAng Jun-guang School of Automation Beijing University of Posts and Telecommunications

In this paper, a walking robot is established. The zero-moment point（ZMP） is used to stabilize the working robot. The kinematic model of the robot based on denavit-hartenberg（D-H） method is presented in this thesis. And then the dynamic model, based on Lagrange method, is built by simplify.ng the kinematic model of robot body. A kinematic simulation to the robotic system is achieved based on Adams. Driving torque of left ankle is calculated according to joint angle, angular velocity and angular acceleration. The validity of the dynamic model is testified by comparing with the result of simulation.

关键词： walking robot D-H method dynamic modeling Lagrange method Adams simulation

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

Symmetry Reduction, Exact Solutions, and Conservation Laws of （2＋1）-Dimensional Burgers Korteweg-de Vries Equation

引用

Communications in Theoretical Physics 2006年第1X期46卷 15-20页

作者： dong Zhong-Zhou LIU Xi-qiang BAI Cheng-Lin School of Mathematical Science Liaocheng University Liaocheng 252059 China School of Physical Science and Information Engineering Liaocheng University Liaocheng 252059 China

Using the classical Lie method of infinitesimals, we first obtain the symmetry of the （2＋1）-dimensional Burgers-Korteweg-de-Vries （3D-BKdV） equation. Then we reduce the 3D-BKdV equation using the symmetry and give some exact solutions of the 3D-BKdV equation. When using the direct method, we restrict a condition and get a relationship between the new solutions and the old ones. Given a solution of the 3D-BKdV equation, we can get a new one from the relationship. The relationship between the symmetry obtained by using the classical Lie method and that obtained by using the direct method is also mentioned. At last, we give the conservation laws of the 3D-BKdV equation.

关键词： 3D-BKdV equation classical Lie method direct method conservation laws

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

Dissipative preparation of multipartite Greenberger-Horne-Zeilinger states of Rydberg atoms

引用

Chinese Physics B 2021年第2期30卷 71-78页

作者： Chong y.ng dong-Xiao Li Xiao-qiang Shao Center for Quantum Sciences and School of Physics Northeast Normal UniversityChangchun 130024China Center for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of EducationNortheast Normal UniversityChangchun 130024China School of Physics International Joint Laboratory on Quantum Sensing and Quantum MetrologyHuazhong University of Science and TechnologyWuhan 430074China

The multipartite Greenberger-Horne-Zeilinger(GHZ)states play an important role in large-scale quantum information *** utilize the polychromatic driving fields and the engineered spontaneous emissions of Rydberg states to dissipatively drive three-and four-partite neutral atom systems into the steady GHZ states,at the presence of the nextnearest neighbor interaction of excited Rydberg ***,the introduction of quantum Lyapunov control can help us optimize the dissipative dynamics of the system so as to shorten the convergence time of the target state,improve the robustness against the spontaneous radiations of the excited Rydberg states,and release the limiting condition for the strengths of the polychromatic driving *** the feasible experimental conditions,the fidelities of three-and four-partite GHZ states can be stabilized at 99.24%and 98.76%,respectively.

关键词： multipartite entanglement Lyapunov control Rydberg antiblockade quantum dissipation

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

Uptake and accumulation of copper by roots and shoots of maize( Zea mays L.)

引用

Journal of Environmental Sciences 2001年第2期13卷 228-232页

作者： LIU dong-hua J IAng Wu-sheng HOU Wen-qiang Department of Biology College of Chemistry and Life SciencesTianjin Normal UniversityTianjin 300074China Library Tianjin Normal UniversityTianjin 300074China College of Life Sciences Nankai UniversityTianjin 300071China

The effects of different concentrations of copper sulfate on root and shoot growth of maize( Zea mays L.) and the uptake and accumulation of Cu2+ by its roots and shoots were investigated in the present study. The concentrations of copper sulfate (CuSO4 (.) 5H(2)O) used were in the range of 10(-5) -10(-3)mol/L. Root growth decreased progressively with increasing concentration of Cu2+ in solution. The seedlings exposed to 10(-3) mol/L Cu2+ exhibited substantial growth reduction, yielding only 68% of the root length of the control. The shoot growth of the seedlings grown at 10(-5) -10(-4) mol/L Cu2+ were more or less the same as the control seedlings. The leaves treated with 10(-3) mol/L Cu2+ were obviously inhibited in shoot growth. The fresh and dry weights both in roots and shots decreased progressively with increasing Cu2+ concentration. This fits well with the above mentioned effects of copper sulfate on root growth. Zea mays has considerable ability to remove Cu from solutions and accumulate it. The Cu content in roots of Z. mays increased with increasing solution concentration of Cu2+. The amount of Cu in roots of plants treated with 10(-3), 10(-4) and 10(-5) mol/L Cu2+ were 10, 8 and 1.5 fold, respectively, greater than that of roots of control plane. However, the plants transported and concentrated only a small amount of Cu in their shoots.

关键词： Zea mays L. uptake accumulation Cu^(2+)

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

Ti-based glassy alloys in Ti-Cu-Zr-Sn system

引用

Science China(Physics,Mechanics & Astronomy) 2013年第7期56卷 1419-1422页

作者： WAng ZengRui dong DanDan qiang JianBing WAng Qing WAng y.ngMin dong Chuang Key Laboratory of Materials Modification (Ministry of Education) Dalian University of Technology

Bulk amorphous formation in Ti-Cu-based multicomponent alloys, free of Ni, Pd and Be elements, were studied using the cluster-plus-glue-atom model. The basic cluster formula was revealed as [Ti9Cu6]Cu3 to explain the best binary glass forming composition Ti50Cu50=Ti9Cu9, where the CN14 rhombi-dodecahedron Ti9Cu6 was the principal cluster in the devitrification phase CuTi. This basic cluster formula was further alloyed with Zr and Sn and a critical glass forming ability was reached at （Ti7.2Zr1.8）（Cus.72Sn0.28） and （Ti7.2Zr1.8）（Cu8.45Sn0.55） up to 5 mm in diameter by suction casting, which was the largest in Ti-Cu- based and Ni-, Pd- and Be-free alloys.

关键词： Ti-based alloy bulk metallic glasses cluster-plus-glue-atom model glass forming ability

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

Value of T-tube in biliary tract reconstruction during orthotopic liver transplantation:a meta-analysis

引用

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第5期12卷 357-364页

作者： Wei-dong HUAng Jiu-kun JIAng yuan-qiang LU Department of Emergency the First Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310003 China

Objective:To compare biliary complications after biliary tract reconstruction with or without T-tube in orthotopic liver ***:Randomized control trials(RCTs) and comparative studies were identified by a computerized literature search of the Cochrane Library,MEDLINE(1966/1-2010/4),Scopus(1980/1-2010/4),***(2010/4),the Cochrane Hepato-Biliary Group Controlled Trials Register,and the Cochrane Central Register of Controlled *** and data were extracted and assessed *** outcomes were reported as odds ratios(ORs) and weighted mean difference with 95% confidence intervals(CI).Results:Five RCTs and eight comparative studies with a total of 1 608 subjects were *** data showed that the operation with T-tube had better outcomes for duct stenosis(P=0.01,OR=0.45,95% CI 0.24-0.85).The operations with or without T-tube had equivalent outcomes as follows:overall biliary complications(P=0.85,OR=1.15,95% CI 0.28-4.72),bile leaks(P=0.38,OR=0.75,95% CI 0.39-1.42),and cholangitis(P=0.24,OR=4.64,95% CI 0.36-60.62).These results were strengthened by the analysis of all thirteen non-randomized and randomized ***:Our systematic review and meta-analysis suggest that the insertion of a T-tube reduces the incidence of biliary stenosis without increasing the incidence of other biliary complications.

关键词： Liver transplantation Drainage Biliary tract Meta-analysis T-tube

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

Influences of preparation techniques on glass-forming ability of Fe-P-B-Si-C amorphous alloys

引用

Journal of Iron and Steel Research International 2018年第6期25卷 674-679页

作者： Ji-jun Zhang ya-qiang dong Lu-y.ng Bie qiang Li Jia-wei Li Xin-min Wang Key Laboratory of Magnetic Materials and Devices NingboInstitute of Materials Technology and Engineering ChineseAcademy of Sciences Ningbo 315201 Zhejiang China Zhejiang Province Key Laboratory of Magnetic Materials andApplication Technology Ningbo Institute of MaterialsTechnology and Engineering Chinese Academy of SciencesNingbo 315201 Zhejiang China University of Chinese Academy of Sciences Beijing 100049China School of Physics Science and Technology XinjiangUniversity Urumqi 830046 Xinjiang China

It has been widely accepted that the ultrafast cooling rate is required for the glass formation of amorphous alloys. Here, the larger glass-forming ability （GFA） of Fe76P5（B0.5Si0.3C0.2）19 amorphous alloy was achieved by water quenching at lower cooling rate under argon atmosphere. Cylindrical rods with diameters of 1-2 mm were prepared by water quenching without flux treatment, Cu-mold injection casting, and Cu-mold suction casting, respectively. The influences of the preparation techniques with different cooling rates on GFA, thermal property, and nucleation/growth behavior were examined. The critical diameter of the Fe76P5（B0.5Si0.3C0.2）19 amorphous alloys is 1.7 mm for water quenching while smaller than 1.0 mm for injection casting. Microstructure analysis indicates that the crystallization and solidification processes are quite different between the water-quenched and the injection-cast rods. These findings could deepen fun-damental understanding on the relationship between the cooling rate, techniques, and GFA of Fe-based amorphous alloys.

关键词： Fe-based amorphous alloy Preparation technique Glass-forming ability Crystallization behavior

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：