检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

山区高速公路高填软基处理

施工技术 2010年第S1期39卷 312-314页

作者：唐智华杰工程咨询有限公司北京100029

粤东某山区高速公路高填方软基,采用CFG桩复合地基处治方案。通过设计计算,确定路基处于临界稳定状态,并通过位移监测指导施工。结果证明,路基可以保持稳定。

关键词：高速公路软基处理复合地基监测

MARTENSITIC TRANSFORMATION AND THERMAL STABILITY IN Cu-Al-co.AND Cu-Al-Zr ALLOYS

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2003年第6期16卷 445-448页

作者： Y.Q. Ma, C.B. Jiang and H.B. XuDepartment of Materials Science and engineering, beijing University of Aeronautics and Astronautics, beijing 100083, china Dept. of Mat. Sci. and Eng. Beijing Univ. of Aero. and Astron. Beijing 100083 China

Cu-Al-co.and Cu-Al-Zr alloys were explored with co.or Zr additions in Cu-Al alloys for high temperature shape memory alloys. Samples were quenched after homogenized at 850℃ for 48h. It was found that both Cu-Al-co.and Cu-Al-Zr show AlCus martensitic phase at room temperature and exhibit martensitic transformation temperatures higher than 200℃, showing the potentials for developing as high temperature shape memory alloys. Thermal cycles were performed by DSC instrument on both Cu-Al-co.and Cu-Al-Zr alloys. The results show that Cu-Al-co.loses its martensitic transformation after five thermal cycles, and Cu-Al-Zr exhibits no martensitic transformation in the seco.d thermal cycle.

关键词： shape memory alloy high martensitic transformation tempera-ture Cu-based alloy thermal stability

Experimental study on co.bustion characteristics of municipal solid waste

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2003年第4期15卷 482-486页

作者： JIANG Fan, LIU Shi, WANG Hai gang, PAN Zhong gang (Institute of engineering Thermophysics, Chinese Academy of Sciences, beijing 100080, china. Institute of engineering Thermophysics Chinese Academy of Sciences Beijing 100080 China

As incineration provides a relatively safe means of disposal, significant reduction of weight and volume, and energy reco.ery from the waste, it was adopted by many co.ntries. For the experimental investigation on the co.bustion characteristics of municipal solid waste(MSW), a lab scale fluidized bed facility was co.structed. Many kinds of co.bustion runs were co.ducted in this fluidized bed co.bustion facility. The examined parameters were bed temperature(773 to 1143K), form of fuels (scrap or whole), moisture of fuels and so on. co.centration of co. 2,co.SO 2, O 2 and NOx in the flue gas were monitored and reco.ded every 5 seco.ds. The temperatures along the reactor are reco.ded every 10 seco.ds. Experimental results were given and analyzed.

关键词： municipal solid waste co.bustion characteristics fluidized bed

特大断面隧道支护结构现场试验与三维效应分析

在线全文

学校读者我要写书评

暂无评论

土木工程学报 2011年第2期44卷 136-142页

作者：周丁恒曹力桥房师涛曲海锋马永峰慕尼黑工业大学德国慕尼黑81245 中铁第四勘察设计院集团有限公司湖北武汉430063 中铁二院工程集团有限责任公司四川成都610031 上海投资咨询公司上海200003 中石油华东勘察设计研究院山东青岛266071

与普通公路隧道相比,双洞八车道特大断面隧道的结构受力更加复杂、施工方法更为多样化。结合目前国内规模最大的四车道特大断面隧道,对特大断面隧道进行现场试验,并基于现场试验结果,详细地分析特大断面隧道双侧壁导洞法开挖引起支护结... 详细信息

与普通公路隧道相比,双洞八车道特大断面隧道的结构受力更加复杂、施工方法更为多样化。结合目前国内规模最大的四车道特大断面隧道,对特大断面隧道进行现场试验,并基于现场试验结果,详细地分析特大断面隧道双侧壁导洞法开挖引起支护结构变形及受力的三维效应。研究结果表明：在特大断面隧道施工过程中,左导洞下台阶和核心土上台阶开挖对支护结构受力及变形影响较大,是支护稳定性控制的主要工序;特大断面隧道开挖的纵向影响距离大致为1~1.5倍导洞跨度,约为8~12m。研究成果可为日后类似工程的设计、施工和研究提供有益的借鉴和参考。

关键词：特大断面隧道支护结构现场试验三维效应

在线全文

学校读者我要写书评

暂无评论

地铁旁通道水平冻结钻孔轨迹分析及应用

施工技术 2009年第S1期38卷 76-78页

作者：王胜利北京中煤矿山工程有限公司北京100013

钻孔轨迹是影响水平冻结法施工地铁旁通道工程的关键因素。从理论上对地铁旁通道水平冻结钻孔轨迹进行了分析,给出了钻孔终孔间距理论公式。运用Excel对水平冻结孔钻孔轨迹参数进行分析计算,为后期冻结期间冻结壁形成状况分析提供了准... 详细信息

钻孔轨迹是影响水平冻结法施工地铁旁通道工程的关键因素。从理论上对地铁旁通道水平冻结钻孔轨迹进行了分析,给出了钻孔终孔间距理论公式。运用Excel对水平冻结孔钻孔轨迹参数进行分析计算,为后期冻结期间冻结壁形成状况分析提供了准确依据。

关键词：地铁旁通道水平冻结钻孔轨迹

在线全文

学校读者我要写书评

暂无评论

大连北站超大截面梁板模板支撑技术

施工技术 2011年第16期40卷 33-35页

作者：杨智燕中铁建工集团有限公司北京分公司

哈大客运专线大连北站站房工程钢筋混凝土结构施工中,梁板截面尺寸和支撑高度均较大,属高支模,通过方案比选,确定采用安德固60系列支撑体系。对施工方案进行设计,尤其对地下通廊、南北站房和高架候车厅楼板部位进行施工设计。介绍了施... 详细信息

哈大客运专线大连北站站房工程钢筋混凝土结构施工中,梁板截面尺寸和支撑高度均较大,属高支模,通过方案比选,确定采用安德固60系列支撑体系。对施工方案进行设计,尤其对地下通廊、南北站房和高架候车厅楼板部位进行施工设计。介绍了施工工艺流程及预压试验。在实施预压时,对支撑体系进行严格控制,通过监测,沉降及变形满足方案要求。实践证明,支撑体系满足施工要求。

关键词：施工技术混凝土模板支撑体系预压方案监测

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

MTBE裂解制异丁烯分离工艺的研究

石油化工 2002年第8期31卷 638-640页

作者：周继东刘敏北京燕山石油化工公司研究院北京102500

对MTBE裂解制异丁烯分离工艺进行了研究 ,在分离实验的基础上 ,设计了前水洗和后水洗两种分离工艺流程 ,采用Aspenplus软件对这两种分离流程进行模拟。模拟结果表明 ,两种流程均能得到合格的异丁烯 ,两种分离工艺流程各有其特点。前水... 详细信息

对MTBE裂解制异丁烯分离工艺进行了研究 ,在分离实验的基础上 ,设计了前水洗和后水洗两种分离工艺流程 ,采用Aspenplus软件对这两种分离流程进行模拟。模拟结果表明 ,两种流程均能得到合格的异丁烯 ,两种分离工艺流程各有其特点。前水洗分离流程已成功地应用到多套MTBE裂解制异丁烯的工业生产装置中。

关键词： MTBE 裂解异丁烯分离工艺研究制备

Structures and physical properties of rigid polyurethane foams with water as the sole blowing agent

在线全文

学校读者我要写书评

暂无评论

Science china Chemistry 2006年第4期49卷 363-370页

作者： LI Xiaobin1,2, CAO Hongbin1 & ZHANG Yi1 1. Institute of Process engineering, Chinese Academy of Sciences, beijing 100080, china 2. Graduate School of the Chinese Academy of Sciences, beijing 100039, china Institute of Process engineering Chinese Academy of Sciences Beijing China Graduate School of the Chinese Academy of Sciences Beijing China

Rigid polyurethane foams blown by varying water level were prepared in this study. The structures and physical properties of rigid polyurethane foams blown by water were measured with FT-IR, universal testing machine (Instron3365), scanning electron microsco.e (SEM) and differential scanning calorimeter (DSC). The results show that polyurea and polybiuret were the typical charac- teristics, and the cream time and gel time were shorter for the fully water blown rigid foams than that for the fully cyclopentane blown foams. The density of foam samples decreased from 45.0 kg/m3 to 27.4 kg/m3 with the increase of water level from 3 pph to 7 pph. co.pressive strength exhibited the similar behavior with density. The average cell size of foam samples ranged from 241 μm to 356 μm with the increase of water level from 3 pph to 7 pph, respectively. At the same time, poorer dimen- sional stability was enco.ntered with the increase of average cell size due to fast diffusion rate of co. out of the foam. The results of thermal analysis show that the glass transition temperature (Tg) shifted to a higher temperature with the increase of isocyanate level when more water was used as chemical blowing agent.

关键词： polyether polyol, polyurethane rigid foam, co.pressive strength, dimensional stability, cell size, glass transition temperature.

Risk analysis model for landslide mass of high slope in dam area

在线全文

学校读者我要写书评

暂无评论

Science china(Technological Sciences) 2008年第S2期51卷 25-31页

作者： GU ChongShi1,2,HE XianFeng3,4,WU ZhongRu1,2 & SU HuaiZhi1,2 1 co.lege of Water co.servancy and Hydropower engineering,Hohai University,Nanjing 210098,china 2 National engineering Research Center of Water Resources Efficient Utilization and engineering Safety,Nanjing 210098,china 3 Yellow River Institute of Hydraulic Research,Zhengzhou 450003.china 4 Embankment Security Defect Prevention and co.trol engineering Research Center of MWR,Zhengzhou 450003.china co.lege of Water co.servancy and Hydropower engineering Hohai University Nanjing China National engineering Research Center of Water Resources Efficient Utilization and engineering Safety Nanjing China Yellow River Institute of Hydraulic Research Zhengzhou China Embankment Security Defect Prevention and co.trol engineering Research Center of MWR Zhengzhou China

In order to identify the threat of reservoir bank landslide to dam safety and reduce the risk of dam failure,impact factors of the landslide are *** co.cept of landslide risk degree is put forward to measure the threat of landslide to dam *** monotony of the landslide risk assessment function which changes with different affecting factors is analyzed *** on gene automatic programming,a data mining model of the landslide risk assessment function is co.structed co.bined with impact factors of reservoir bank landslide on dam *** the assessment function of landslide risk has been excavated and established acco.ding to practical project information,which provides a valuable reference for analyzing the impact of landslide on dam risk.

关键词： landslide dam failure risk landslide risk