检索结果-南通市图书馆

A preliminary study of the variation of phytoplankton absorption coefficients in the northern South china Sea

Acta Oceanologica Sinica 2009年第5期28卷 17-29页

作者： WU Jingyu HONG Huasheng SHANG Shaoling DAI Minhan LEE Zhongping LI Shaojing state key laboratory of Marine Environmental Science Xiamen University Xiamen 361005 China Department of Oceanography Xiamen University Xiamen 361005 China Naval Research Lab Code 7333 Stennis Space Center MS 39529 USA

The temporal and spatial variabilities of phytoplankton absorption coefficients （a ph （λ）） and their relationships with physical processes in the northern South china Sea were examined, based on in situ data collected from two cruise surveys during May 14 to 25, 2001 and November 2 to 21, 2002. Significant changes in the surface water in a ph values and B/R ratios （a ph （440）/a ph （675）） were observed in May, which were caused by a phytoplankton bloom on the inner shelf stimulated by a large river plume due to heavy precipitation. This is consistent with the observed one order of magnitude elevation of chlorophyll a and a shift from a pico/nano dominated phytoplankton community to one dominated by micro-algae. Enhanced vertical mixing due to strengthened northeast monsoon in November has been observed to result in higher surface a ph （675）（0.002–0.006 m-1 higher） and less pronounced subsurface maximum on the outer shelf/slope in November as compared with that in May. Measurements of a ph and B/R ratios from three transects in November revealed a highest surface a ph （675） immediately outside the mouth of the Zhujiang （Pearl） River Estuary, whereas lower a ph （675） and higher B/R ratios were featured in the outer shelf/slope waters, demonstrating the respective influence of the Zhujiang River plume and the oligotrophic water of the South china Sea. The difference in spectral shapes of phytoplankton absorption （measured by B/R ratios and bathochromic shifts） on these three transects infers that picoprocaryotes are the major component of the phytoplankton community on the outer shelf/slope rather than on the inner shelf. A regional tuning of the phytoplankton absorption spectral model （Carder et al., 1999） was attempted, demonstrating a greater spatial variation than temporal variation in the lead parameter a 0 （λ）. It was thus implicated that region-based parameterization of ocean color remote sensing algorithms in the northern South china Sea was mandatory.

关键词： phytoplankton absorption coefficient variation picoprokaryotes parameterization South china Sea

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

Stability analysis of a simple rheonomic nonholonomic constrained system

引用

Chinese Physics B 2016年第12期25卷 314-317页

作者：刘畅刘世兴梅凤翔 College of Physics Liaoning University state key laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsDalian University of Technology School of Aerospace Engineering Beijing Institute of Technology

It is a difficult problem to study the stability of the rheonomic and nonholonomic mechanical systems. Especially it is difficult to construct the Lyapunov function directly from the differential equation. But the gradient system is exactly suitable to study the stability of a dynamical system with the aid of the Lyapunov function. The stability of the solution for a simple rheonomic nonholonomic constrained system is studied in this paper. Firstly, the differential equations of motion of the system are established. Secondly, a problem in which the generalized forces are exerted on the system such that the solution is stable is proposed. Finally, the stable solutions of the rheonomic nonholonomic system can be constructed by using the gradient systems.

关键词： nonholonomic constrained system stabillity gradient system Lyapunov function

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

Simultaneous Determination of Fluorescein, Rhodamine 6G and Rhodamine B in Turbid Solution by Polarization Variable-Angle Synchronous Fluorescence Spectrometry

引用

Chinese Chemical Letters 2000年第7期11卷 613-614页

作者： Yao Qun LI Fang QIAN Xian Zhi HUANG(Department of Chemistry and key laboratory of Analytical Sciences of the Ministry of Education,Xiamen university, Xiamen 3.1005) Xiamen Univ Dept Chem Xiamen 361005 Peoples R China Xiamen Univ Key Lab Analyt Sci Minist Educ Xiamen 361005 Peoples R China

Polarization variable-angle synchronous fluorescence spectrometry was proposed to determine samples in turbid solution. A mixture of fluorescein, rhodamine 6G and rhodamine B was used to evaluate the technique. The background caused by scattering light was decreased remarkably. The limits of detection were 0.6 ng/ml for fluorescein, 2.3.ng/ml for rhodamine 6G and 4.1 ng/ml for rhodamine B, respectively.

关键词： variable-angle synchronous fluorescence polarization fluorescein rhodamine 6G rhodamine B

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 ORIENTATION ON STRESS RESPONSE,FRICTION STRESS AND BACK STRESS DURING CYCLIC DEFORMATION IN Al SINGLE CRYSTALS

引用

Acta Metallurgica Sinica(English Letters) 1993年第1期6卷 67-72页

作者： XIA Yuebo ZHANG Tianyi state key laboratory for Fracture and Failure of Materials.Institute of Metal Research,Academia Sinica.Shenyang.{3. DENG Jun Shenyang Polytechnical university.{3. Associate Professor,Institute of Metal Research,Academia Sinica,Shenyang 110015,{3.

The symmetrical push-pull fatigue tests at strain amplitude of 2×10~3.with different slip orientation of Al single crystals,were carried out at room temperature in *** peak stresses of various cycles were measured an... 详细信息

关键词： crystal orientation cyclic deformarion stress response energy loss slip morphology

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

Multiuser detection and independent component analysis——Progress and perspective

引用

Progress in Natural Science:Materials International 2002年第7期 15-22页

作者： JIAO Licheng , MA Haibo and LIU Fang( state key laboratory for Radar Signal Processing, Xidian {3., Xi’an 710071, china) state key laboratory for Radar Signal Processing Xidian University Xi'an 710071 China

The latest progress in the multiuser detection and independent component analysis (ICA) is reviewed systematically. Then two novel classes of multiuser detection methods based on ICA algorithms and feedforward neural networks are proposed. Theoretical analysis and computer simulation show that ICA algorithms are effective to detect multiuser signals in code-division multiple-access (CDMA) system. The performances of these methods are not identical entirely in various channels, but all of them are robust, efficient, fast and suitable for real-time implementations.

关键词： code division multiple access (CDMA) multiuser detection independent component analysis (ICA).

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

Experimental Investigation of Thermal Lensing in End-pumped Nd∶YVO4 Crystal Using a New Simple Approach

引用

Chinese Journal of Lasers 1999年第2期8卷 8-13页

作者： LIU Junhai LU Jianren LU Junhua SHAO Zongshu JIANG Minhua (National laboratory of Crystal Materials, Shandong university, Jinan 250100, china) 山东大学晶体材料国家重点实验室山东济南 250100 山东大学晶体材料国家重点实验室山东济南

１ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｈｉｇｈｐｏｗｅｒｓｏｌｉｄｓｔａｔｅｌａｓｅｒｓ，ｐｕｍｐｉｎｄｕｃｅｄｔｈｅｒｍａｌｆｏｃｕｓｉｎｇｉｓｏｆｐｒｉｍａｒｙｉｍｐｏｒｔａｎｃｅｂｅｃａｕｓｅｏｆｉｔｓｓｉｇｎｉ... 详细信息

１ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｈｉｇｈｐｏｗｅｒｓｏｌｉｄｓｔａｔｅｌａｓｅｒｓ，ｐｕｍｐｉｎｄｕｃｅｄｔｈｅｒｍａｌｆｏｃｕｓｉｎｇｉｓｏｆｐｒｉｍａｒｙｉｍｐｏｒｔａｎｃｅｂｅｃａｕｓｅｏｆｉｔｓｓｉｇｎｉｆｉｃａｎｔｉｎｆｌｕｅｎｃｅｓｏ...

关键词： thermal lensing thermal focal length Nd∶YVO 4 crystal resonator stability

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

Preparation and Properties of Nano-TiO_2 Powders

引用

Journal of Materials Science & Technology 1997年第4期13卷 321-323页

作者： Zhe SONG Qing LI and Lian GAO(state key Lab. of High Performance Ceramics & Superfine Microstructure, Shanghai Institute of Ceramics,Chinese Acadmey of Sciences, Shanghai 200050, china) state key Lab. of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Acadmey of Sciences Shanghai 200050 China

This paper reports the preparation of nano-TiO2 (about 10 nm) powder by the method of precipitation. In detail, some breparation conditions were investigated in order to find out how to control the grain size and reduce the agglomeration of powders. Also, the reflex spectra of nano-scale powders with different grain size were studied. It tvas found that the wave length and width of reflex spectra are connected with the grain size of nano-TiO2 powders

关键词： TiO Nano Preparation and Properties of Nano-TiO2 Powders OC

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

无线事务协议的实现研究

引用

计算机工程与应用 2002年第2期38卷 115-117页

作者：赵晨赵阿群顾冠群东南大学计算机科学与工程系南京210096 教育部计算机网络与信息集成重点实验室南京210096

无线事务协议为整个无线应用协议体系结构提供可靠的面向连接的传输服务。文章首先对无线事务协议的协议特性和功能进行分析和研究,并在此基础上给出该协议软件的实现框架。

关键词：无线事务协议无线应用协议 WAP网关通信协议

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

Single Nucleotide Polymorphisms Analysis of Noise-Induced Hearing Loss Using Three-Dimensional Polyacrylamide Gel-Based Microarray Method

Single Nucleotide Polymorphisms Analysis of Noise-Induced He...

引用

浙江省医学会耳鼻咽喉科学分会成立60周年庆典暨2011年浙江省医学会耳鼻咽喉头颈外科学学术年会

作者： Department of Otolaryngology,Beilun Branch of the First Affiliated Hospital(People’s Hospital of Beilun),Medical College of Zhejiang university(3.5800) Guihua Xia Weiwei Gao Ke Ji Shaosheng Liu1 Bo Wan Wuxi Agene Bioinformatics & Biotechnology Co.,Ltd.(21413.) Junfeng Luo state key {3. of bioelectronics,southeast university,nanjing(210096) Yunfei Bai

Noise induced hearing loss(NIHL) is a complex occupational hazard caused by an interaction between genetic and environmental *** of Chinese industrial people are daily exposed to high level of *** the environmental risk factors have been studied extensively,the nature of the genetic factors contributing to HIHL has not yet been *** this study,we investigated 15 single nucleotide polymorphisms (SNPs) in 6 candidate genes influence susceptibility to noise in Chinese noise-exposed *** from 3.dimensional polyacrylamide gel-based microarray platforms were analyzed.103.blood samples were collected from noise-exposed laborers in Ningbo,Zhejiang,***,the interaction between noise exposure and genotypes and their effect on NIHL were analysed using logistic *** interesting results were observed between noise exposure levels and genotypes of three SNPs,hence confirming that they are NIHL susceptibility genes in Chinese population.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Effect of elevated CO_2 on CH_4 emission

引用

Chinese Science Bulletin 1999年第13期44卷 1153-1157页

作者： WANG Dalistate key laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085,{3. state key laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Science Beijing China

Global CH4 emission may increase under CO2 enrichment condition, which is projected for the future. CO2 enrichment could affect CH4 emission in two ways: （ ⅰ ） Photosynthesis of plants that also include plants in rice paddies and natural wetlands will be stimulated under CO2 enrichment condition. CH4 emission rate may be increased due to the accumulation of more plant biomass, root exudes and soil organic matters. （ ⅱ ） Combined with other global warming forces, CO2 enrichment may bring a change of atmospheric temperature and precipitation around the world. CH4 emission will also be changed with the variation of the area and distribution of rice paddies and natural wetlands.

关键词： global change CO2 enrichment CH4 emission.

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：