检索结果-南通市图书馆

Development of chinese characterization factors for land use in life cycle impact assessment

在线全文

学校读者我要写书评

暂无评论

Science china(Technological sciences) 2010年第6期53卷 1483-1488页

作者： LIU Yu,NIE ZuoRen,SUN BoXue,WANG ZhiHong & GONG XianZheng school of Materials Science and Engineering,Beijing University of Technology,Beijing 10012.,china 1. school of Materials Science and Engineering Beijing University of Technology Beijing 100124 China

A model with chinese characterization factors for quantifying the damages to environment by land use in terms of the change in net primary productivity (NPP) of ecosystem was developed in the framework of life cycle assessment (LCA).In this method,the forms of land utilization were divided into two aspects involving long-term use of land (e.g.,for arable farming),namely "land occupation",and the change of land properties (e.g.,from agricultural area to urban area),namely "land transformation".Furthermore,the land use elementary flows (occupation and transformation) and parameters were linked to the impact indicators,and the characterization formulas of the two forms of land utilization were derived respectively according to the ecological ***,based on this method,the characterization factors of both land occupation and land transformation were calculated using chinese empirical information on NPP,which can be incorporated into LCA framework and applied to chinese LCA case study to fill up the important gap in life cycle impact assessment (LCIA) of land use.

关键词： life cycle assessment land use net primary productivity

Random Field Estimation with Quantized Measurements in Sensor Networks

在线全文

学校读者我要写书评

暂无评论

Random Field Estimation with Quantized Measurements in Senso...

第二十九届中国控制会议

作者： WENG Yang1,2.XIE Lihua2.XIAO Wendong3 1.school of Mathematics,Sichuan University,Chengdu,Sichuan 610064,P.R.china2.school of Electrical and Electronic Engineering,Nanyang Technological University,639798,Singapore3.Institute for Infocomm Research,138632.Singapore

In this paper,we study the sensor selection problem for random field estimation in sensor *** combinatorial optimization problem of choosing sensor nodes to minimize the estimation error with bounded observation cost is proved *** algorithms is proposed to pursue the suboptimal solution for the sensor selection problem under the D-optimal ***,the optimal estimator for the Gaussian random field with quantized measurements is proposed in the minimum error variance *** results show the performance of our proposed algorithms.

关键词： Random field estimation NP-hard Exchange algorithm quantization.

Correlation analysis between the bioactive components and ecological factors of Angelica sinensis from different geographical regions

在线全文

cnki会议

学校读者我要写书评

暂无评论

Correlation analysis between the bioactive components and ec...

中药与天然药高峰论坛暨第十二届全国中药和天然药物学术研讨会

作者： Hui Yan~1,Jin-ao Duan~(1*),Shulan Su~1,Dawei Qian~1,Chengzhong Sun~2.Bingsheng Song~3,Ziqing He~3 1 school of Pharmacy,Nanjing University of chinese Medicine,Nanjing 2.0046,PR{2. 2.chinese Academies of Surveying & Mapping,Beijing,100039 3 Gansu Mingui Technology Co.,Ltd.of chinese herbal medicines,Lanzhou,730010

Eighteen samples of Angelica Sinensis Radix(Danggui)and corresponding soil samples were collected from four provinces of Gansu,Yunnan,Sichuan and Hubei,*** environmental factors of longitude,altitude,annual precipitation,sunshine duration and *** obtained through a combination of field survey and GIS *** contents of ligustilide,ferulic acid and the total polysaccharide in Danggui were measured by HPLC and *** contents of mineral elements were determined by the method of *** correlation analysis showed that the ecological factors including longitude,altitude,sunshine duration,Fe,average temperature in July,annual mean temperature,Zn affected on the chemical markers(ligustilide,ferulic acid and the total polysaccharide)of Danggui. In this paper,the results stated that the higher altitude,the long daylight hours,higher soil PH and higher-content Zn could be produced good quality of *** the data revealed that the secondary metabolites dynamic changes in Angelica sinensis related with the environmental factors from different producing areas of Danggui.

关键词： Angelica sinensis ecological factors chemical makers association analysis

痛泻要方对肠易激综合征模型大鼠血管活性肠肽的影响

在线全文

cnki会议

学校读者我要写书评

暂无评论

时珍国医国药 2007年第9期18卷 2098-2099页

作者：李冬华李春淼李伍善邹志东张炎首都医科大学中医药学院北京100069 北京市中医研究所北京100010

目的从胃肠激素的角度研究痛泻要方治疗肠易激综合征的机理。方法32.wistar大鼠随机分成4组:正常对照组,模型对照组、痛泻要方组、得舒特组,后三组大鼠采用束缚应激刺激加灌服番泻叶煎剂的方法造成肠易激综合征(IBS)大鼠模型,观察痛泻... 详细信息

目的从胃肠激素的角度研究痛泻要方治疗肠易激综合征的机理。方法32.wistar大鼠随机分成4组:正常对照组,模型对照组、痛泻要方组、得舒特组,后三组大鼠采用束缚应激刺激加灌服番泻叶煎剂的方法造成肠易激综合征(IBS)大鼠模型,观察痛泻要方对肠易激综合征模型大鼠体内胃肠激素血管活性肠肽(VIP)的影响。结果模型对照血浆及局部肠组织中VIP含量与正常对照组比较,均有统计学意义(P<0.05～P<0.01)。痛泻要方组血浆VlP含量与模型对照组比较显著降低,有统计学意义(P<0.01);痛泻要方组局部肠组织中VIP含量与模型对照组比较亦有统计学意义(P<0.05)。结论IBS模型大鼠体内存在VIP水平升高的病理状态,痛泻要方可调控胃肠激素VlP的分泌和释放,进而达到治疗目的。

关键词：痛泻要方肠易激综合征大鼠血管活性肠肽

A slice preparation of rat pancreatic islets for patch-clamp recordings in single β cells

在线全文

学校读者我要写书评

暂无评论

A slice preparation of rat pancreatic islets for patch-clamp...

2.08北京国际生理科学学术大会

作者： WU Zheng-Yong~(1,2.,ZHENG Liang-Hong~1,DOU Hai-Qiang~1,ZHU Kuai-Chang~1,LIU Chang~1,YAO Li-Juan~1,YU Xiao~1,ZHANG Claire Xi~1,SHEN Ying~2.ZHOU Zhuan~1 1 Institute of Molecular Medicine,Peking University,Beijing 100871,china 2.Department of Neurobiology,Zhejiang University school of Medicine,Hangzhou 310031,china

Pancreatic isletβcells are responsible for blood glucose control by releasing *** cells sense blood glucose by ATP-receptor,which controls Ca entry and insulin *** disorder inβcell may lead to the severe disease *** fighting diabetes,patch clamp recording in cultureβcells is a powerful tool to examine mechanisms of insulin ***,βcell is metabolic type;it is difficult to prepare primary culture of rat or mouseβcells for *** overcome problem inβcell culture,we aim to prepare slices of pancreas,which enables patch clamp *** gelling-agarose was injected into the distally clamped bile duct and cooled it with an ice-cold extracellular solution,which enhance the mechanical strength for ***βcells in slices are easily patch-clamped,and its voltage-gated currents and evoked secretion can be recorded under whole-cell configuration.

关键词： Pancreatic islet b cells patch-clamp voltage-gated currents ATP-receptor

Dynamic Programming for Single Batching Machine with Total Weighted Completion Time

在线全文

cnki会议

学校读者我要写书评

暂无评论

Dynamic Programming for Single Batching Machine with Total W...

2.10 chinese Control and Decision Conference

作者： Daguang Feng~1,Peng Liu~2.Suwen Wu~1,Bo Liu~1 1.Science of Institute,Shenyang Agricultural University,Shenyang,china,110866 2.school of Management,Shenyang University of Technology,Shenyang,110870,china

＜正＞The problem of total weighted completion time for single batching machine is an open problem until ***,heuristics is very useful to the *** consttuct a nonlinear mathematical model for the problem with unbounded batching machine.A dynamic programming is also carried for the problem,which is proved to be at most 2.times of the optimal solution *** an example,we show that the bound is tight.

关键词： batching machine dynamic programming worst case

A METHOD FOR DETERMINING DYNAMIC FRINGE VALUE (f_σ)d OF PHOTOELASTIC MATERIALS LOADED EXPLOSIVELY

在线全文

cnki会议

学校读者我要写书评

暂无评论

chinese Science Bulletin 1988年第9期33卷 779-782页

作者：朱振海 Beijing graduate school China Institute of Mining and Technology

Ⅰ. INTRODUCTION The dynamic fringe value （fσ）d of photoelastic materials is one of the important parameters to quantitative calculation in dynamic photoelasticity. Clark, Clark and Sanford, and Pih investigated （fσ）d of photoelastic materials impacted with a projectile or a falling hammer (the effective loading time is more than 10-4 s)

关键词： fringe hammer impacted falling projectile DYNAMIC quantitatively tangential thick gained

镧(Ⅲ)与硫脲配合物的合成、表征及抗菌活性研究

在线全文

学校读者我要写书评

暂无评论

稀土 2002年第3期23卷 33-36页

作者：彭鹏刘斌王丽张晨鼎防化指挥工程学院化工所北京102205 内蒙古工业大学化工学院内蒙古呼和浩特010062

本文报道了配合物 L a I3 · 2.CS(NH2.) 2.· 10 H2.O的新的合成方法 ,通过元素分析、X射线粉末衍射、红外光谱、核磁共振谱、质谱、差热—热重分析 ,确定了配合物的组成和结构 ,首次测定了配体和配合物的抗菌活性。

关键词：镧(Ⅲ) 合成表征碘化镧硫脲配合物抗菌活性稀土抗菌剂稀土药物

在线全文

学校读者我要写书评

暂无评论

仿人机器人发展现状及其腰关节的作用

沈阳工业学院学报 2004年第1期23卷 18-23页

作者：李艳杰徐继宁王侃沈阳工业学院机械工程分院北方工业大学

仿人机器人是研究人类智能的高级平台,是综合多种学科的复杂智能机械,其研制和开发涉及到各学科、多方面问题,目前已成为机器人领域的研究热点问题之一.本文对仿人机器人目前的发展现状进行了综述,分析了多种仿人机器人的自由度分布,介... 详细信息

仿人机器人是研究人类智能的高级平台,是综合多种学科的复杂智能机械,其研制和开发涉及到各学科、多方面问题,目前已成为机器人领域的研究热点问题之一.本文对仿人机器人目前的发展现状进行了综述,分析了多种仿人机器人的自由度分布,介绍了具有不同结构特点的腰机构,分析了腰关节在仿人机器人的稳定动态步行、全身协调运动及有情感步行等方面的重要作用.本文还指出了仿人机器人目前的主要研究方向.

关键词：仿人机器人腰关节双足步行自由度协调运动有情感步行