检索结果-南通市图书馆

Wind tunnel test on aerodynamic effect of wind barriers on train-bridge system

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2015年第2期58卷 219-225页

作者： GUO Wei Wei wang yu jing XIA He LU Shan School of Civil Engineering Beijing Jiaotong University Beijing Key Laboratory of Structural Wind Engineering and Urban Wind Environment

To investigate the aerodynamic effect of wind barriers on a high-speed train-bridge system,a sectional model test was conducted in a closed-circuit-type wind *** different cases,including with and without barriers,with different barrier heights and porosity rates,and with different train arrangements on the bridge were taken into consideration;in addition,the aerodynamic coefficients of the train-bridge system were *** is found that the side force and rolling moment coefficients of the vehicle are efficiently reduced by a single-side wind barrier,but for the bridge deck these values are *** height and porosity rate of the barrier are two important factors that influence the windbreak *** arrangement on the bridge will considerably influence the aerodynamic properties of the train-bridge *** side force and rolling moment coefficients of the vehicle at the windward side are larger than at the leeward side.

关键词： wind barrier train-bridge system wind tunnel aerodynamic coefficient windbreak effect

Evolution model for scientific collaboration network with local-world information

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2014年第2期21卷 15-20,31页

作者： TIAN Sheng-wen LIAO Jian-xin wang jing-yu QI Qi State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications School of Information and Electrical Engineering Ludong University

In order to reveal the intrinsic properties of scientific collaboration networks, a new local-world evolution model on a scientific collaboration network is proposed by analysing the network growth mechanism. The act degree as the measurement of preferential attachment is taken, and the local-world information of nodes is taken into account. Analysis and simulation show that the node degree and the node strength obey the power-law distribution. Low average path length and high clustering coefficient are approved. Experiment indicates that the model can depict efficiently the topological structure and statistical characteristics of real-life scientific collaboration networks.

关键词： scientific collaboration network evolution model local-world information scale-flee act degree

Decolorization of azo dyes with high salt concentration by salt-tolerant mixed cultures under anaerobic conditions

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2005年第6期17卷 984-988页

作者： GUO Jian-bo ZHOU Ji-ti wang Dong wang jing yu Hui SONG Zhi-yong School of Environmental and Biological Science and Technology Dalian University of Technology Dalian 116023 China

Because the lack of detailed study of biological decolorization in high salt dye wastewater, it is still difficult to evaluate the biological treatment on high-salinity dye wastewater. The experiments were carried out to study the salt-tolerant bacteria, which is useful in the treatment of high-salinity colored wastewater. Simulated wastewater containing 5-150 g/L salt （NaCI） and 50-2000 mg/L Reactive Brilliant Red K-2BP was treated with three salt-tolerant mixed cultures （CAS, TAS, DSAS）, which were under a gradually acclimated procedure. With the increase of concentrations of salt and dye, the decolorization became low. The abilities of decolorization of dyes wastewater by three mixed cultures （CAS, TAS, DSAS） were studied, CAS and DSAS mixed cultures showed more active for the treatment of high-salinity colored wastewater than TAS mixed cultures. The results suggested that there might be a simple process for the high salt wastewater treatment, which could be incorporated into conventional activated sludge plants.

关键词： anaerobic decolorization hyper-salinity salt-tolerant mixed cultures

2D metal-organic frameworks endow ammonium perchlorate with enhanced thermal effect

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2023年第2期20卷 103-110页

作者： Ye Bao-yun Feng Chen-he Zhao Feng-qi An Chong-wei wang jing-yu Xi'an Modern Chemistry Research Institute Science and Technology on Combustion and Explosion LaboratoryXian 710065PR China School of Environment and Safety Engineering North University of ChinaTaiyuan030051ShanxiPR China Shanxi Engineering Technology Research Center for Ultrafine Powder North University of ChinaTaiyuan030051ShanxiPR China

To investigate the effect of different structures of MOF on the catalytic performance of ammonium perchlorate(AP)thermal *** adding 2-methylimidazole(2-MI)as an inhibitor during the synthesis of MOF-5,a two-dimensional(2D)MOF material was prepared and characterized by SEM,EDS,XRD,FT-IR and other *** prepared two-dimensional material was added to the AP raw material to investigate its effect on the AP thermal decomposition *** DSC and TG test,it was found that the addition of this kind of 2D MOF material can completely eliminate the low-temperature decomposition peak of the AP-based composite and advance the high temperature decomposition peak to 296.5℃,and the apparent heat of decomposition increase to 905.6 J/g,which has a better catalytic effect than the bulk *** addition,through the combustion test,it was found that 2D MOF,as a burning rate catalyst,can effectively enhance the burning rate of AP based solid propellant.

关键词： MOF-5 2D MOF AP Thermal decomposition

Conjugation of Chitooligosaccharide-5-fluorouracil with Bovine Serum Albumin

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第11期17卷 1495-1498页

作者： Rong Min wang jing Feng SONG yu Feng HE Juan Juan MAO Yan LI Key Laboratory of Polymer Materials of Gansu Province Institute of Polymer Northwest Normal University Lanzhou 730070

The interaction between chitooligosaccharide-5-fluorouracil （COS-5FU） and bovine serum albumin （BSA） was studied by fluorescence spectroscopy. It was found that an energy transfer between COS-5FU and BSA had been occurred. The binding constants were calculated, k298K=1.175×10^4 L·mol^-1. Based on the mechanism of energy transfer of dipole-dipole interaction between the donor and acceptor, the distance between BSA and COS-SFU was determined.

关键词： Chitooligosaccharide-5-fluorouracil BSA fluorescence spectroscopy.

The Assessment and Utilization of Straw Resources in China

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2010年第12期9卷 1807-1815页

作者： wang Ya-jing, BI yu-yun and GAO Chun-yu Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China [a] Institute of Agricultural Resources Regional Planning Chinese Academy of Agricultural Sciences Beijing 100081 P.R.China

The study was undertaken to evaluate the collectable and usable volume of existing straw resources, its suitability for different ways of utilization and fully reorganization of its development potential in China. Based on the results on the stubble heights of major crops in the Huang-Huai-Hai area （the area along the Yellow River, Huai River, and Hai River）, the evaluation of the collectable and usable coefficients, and the collectable and usable volumes of various straw resources in China were worked out during 2005. The respective collectable and usable volumes of straw resources were worked out on the basis of suitability as fuel, feed, fertilizer, and base material for edible mushrooms. The total collectable and utilizable quantity of straw in China was 685 950 000 t, and the mean collection coefficient was 0.81 during 2005. The quantity of straw residue and wasted straw accounted for 19%. The collectable and utilizable quantities of grain, cash crop, and other crop straw were 492 310 000, 162 610 000, and 31 030 000 t which accounted for 71.77, 23.71, and 4.52%, respectively of the total collectable and utilizable quantity of straw. The quantity of straw which could be used as fuel was 635 000 000 t, which accounted for 92.63% of total quantity of the straw in the country during 2005. Among the total quantity of collectable and utilizable straw in China during 2005, the quantities of straw suitable and unsuitable for being processed as feedstuff were 587 640 000 and 98 310 000 t, which accounted for 85.67 and 14.33%, respectively. The quantity of straw residue returned to the field and collectable and utilizable straw for direct field restoration was 616 000 000 t, which accounted for about three-fourths of the total straw yield, while the quantity of straw for cultivation of edible mushrooms and industrial processing was about 587 000 000 t, which accounted for more than 85% of the total collectable and utilizable straw. The evaluation results indicate that t

关键词： China straw resources collectable and utilizable quantity suitability assessment

EFFECT OF THE THIRD COMPONENT ON THE CATALYTIC PROPERTIES OF Cu-Co CATALYSTS FOR ALCOHOL SYNTHESIS

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 1994年第1期 70-77页

作者： LI jing wang jing-Chun yu Zuo-Long WU yueChangchun Institute of Applied Chemistry Academia SinicaChangchun, Jilin 130022

The study of the effect of the third compunent on the catalytic prop-erties of Cu-Co catalysts for the selective synthesis of alcohols from CO andHshowed that addition of the third component influenced the reductivn p... 详细信息

关键词： Cu Co EFFECT OF THE THIRD COMPONENT ON THE CATALYTIC PROPERTIES OF Cu-Co CATALYSTS FOR ALCOHOL SYNTHESIS

Chinese Standards on Refractories Dimensions of Refractory Bricks-Part 1:Specification for General Bricks

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

China's Refractories 2012年第2期21卷 37-49页

作者： Zhang Xiaohui wang jing yu Lingyan

1 Scope This standard specifies the terms, definition, di-mension series, size designation representation, dimen-sion standard representation, brick dimension, and di- mension characteristics of general refractory bri... 详细信息

关键词： Chinese Standards on Refractories Dimensions of Refractory Bricks-Part 1 length

在线全文

学校读者我要写书评

暂无评论

电力系统振荡模态的矩阵束辨识法

中国电机工程学报 2007年第19期27卷 12-17页

作者：王宇静于继来哈尔滨工业大学电气工程系黑龙江省哈尔滨市150001

利用广域测量系统(WAMS)提供的数据进行电力系统振荡模态的在线辨识,对于及时监测系统的阻尼情况并及时实施有效的控制具有重要意义。分析了如何利用测量数据构造矩阵束并进行电力系统振荡模态辨识的方法。该方法可以由不同测点提供的... 详细信息

利用广域测量系统(WAMS)提供的数据进行电力系统振荡模态的在线辨识,对于及时监测系统的阻尼情况并及时实施有效的控制具有重要意义。分析了如何利用测量数据构造矩阵束并进行电力系统振荡模态辨识的方法。该方法可以由不同测点提供的系统响应数据快速检测出不同振荡模态的振荡频率、阻尼系数、振荡幅值和相对相位等有关信息。利用辨识出的模态信息,可以在线监测大规模电力系统阻尼薄弱区域并及时发现故障发生区域。EPRI-36节点仿真算例和某省网实际系统分析结果表明,矩阵束方法能够准确地估计系统的振荡模态,并具有较强的抗噪声能力,是一种适于在线应用的振荡模态信息辨识方法。

关键词：电力系统广域测量低频振荡矩阵束模态辨识