小城镇发展规模研究--以天津市为例

小城镇的合理发展规模 城镇合理规模主要指在一定的历史时期内,根据城镇的性质和具体条件、科学技术、生产力和经济水平,从低消耗、高效率、有利生产、方便生活,达到良好的经济、社会和生态环境效益而制定的规模。一般用两个指标进行衡量,一是人口规模,二是用地规模。     

Spatial competition and regulatory change in the grain handling and transportation system in western Canada

The grain handling and transportation system (GHTS) has been a defining component of the western Canadian economy since the early part of the last century. Only two major railways serve the grain handling industry, so the potential for the exercise of market power in transportation appears to be significant. In fact, spatially oriented regulations applicable to railways exist in Canada to mitigate this, but to date they have not often been used by shippers. While the reasons for this are not completely clear, we suggest that the regulations are now inadequate for the current state of the GHTS. Using a unique data set from the year 2000, we assess the effect on the grain handling industry of modifications to these regulations, and find that significant gains for shippers from these modifications are possible. These gains are computed to be on the order of C$10–15 million per year for grain shippers alone. We would like to thank conference and presentation participants (Transportation Research Board, Canadian Agricultural Economics Society, University of British Columbia, University of Leeds and California State University, Long Beach) as well as the anonymous reviewers who commented on the earlier versions of this paper. We would also like to acknowledge support from the Saskatchewan Department of Highways.     

城市地域文化特色塑造:乌鲁木齐二道桥民族风情一条街规划

问题 二道桥民族风情一条街位于乌鲁木齐市解放南路和胜利路地段，历来是多种少数民族聚集地。历史掌故上“二道桥”、“洋行街“，以经营新疆土特产和外国进口商品为主．具有100多年历史和浓郁民族风情。     

怎样扑救高层办公大楼火灾

1　掌握容易造成火势蔓延的部位　　有人说 ,高层办公大楼火灾不能被扑救 ;也有的人说 ,多数高层建筑火灾可以被第一条供水线路扑灭——很幸运。如果你能够用第一条水带线路作为控制火势发展的主要方向 ,就能够阻止火势的蔓延。由于热量通常向上传播 ,因而你必须到达着火楼层的上一楼层 ,阻止火势沿垂直方向蔓延。为了阻止高层办公大楼内的火势向上蔓延 ,消防队员应当懂得自己该观察哪些部位。这是一个不容忽视的环节 ,因为你不可能在一个 2 0 0 0 0 ft、拥有 15 0个房间的楼层中跑来跑去 ,通过嗅觉来寻找烟气。从以前发生过的高层建筑火灾…     

Decomposing regional productivity growth using an aggregate production frontier

The main contribution of this paper is the implementation of a new model which combines the two parametric approaches most commonly used in the productivity literature: fixed effects and stochastic frontiers. This allows us to discuss whether it is better to use average or frontier functions to estimate regional productivity. The empirical section uses panel data of Spanish regions over the period 1980–1995. Additionally, we calculate and decompose total factor productivity growth for the Spanish regions.     

门窗用塑料异型材的质量检测

提出了塑料门窗用异型材存在的一些质量问题,阐述了异型材质量检测的几个主要环节及相应的国家标准,并就提高此项产品质量提出了建议。     

水泥混凝土路面设计和施工中若干问题的探讨

文章论述水泥混凝土路面设计和施工中,导致水泥路面容易损坏的荷载、自然因素、路基、基层、缝体及裂逢等几个方面问题,并提出注意事项及防治措施。     

对“小城镇”定义及“三农”问题的思考

20世纪80年代以来，对“小城镇”这一命题未能形成统一的概念，也没有明的规定，各界对“小城镇”的涵盖范围存在颇多的争议。本着“理性的怀疑、多元的思考、平权的争论和实践的检验”的求知欲望，商榷“小城镇”这一定义的科学性及其影响，确立科学的城乡发展观，对探索解决“三农”问题的途径，具有现实的意义。     

Selective adsorption of p-chloronitrobenzene from aqueous mixture of p-chloronitrobenzene and o-chloronitrobenzene using HZSM-5 zeolite

The selective adsorption of p-chloronitrobenzene (p-CNB) using zeolite as the adsorbent from an aqueous mixture containing p-CNB and o-chloronitrobenzene (o-CNB) was investigated. The maximum adsorption amounts of p-CNB in HZSM-5 zeolite were found to be approximately 4 molecules per unit cell (mol/uc) at all adsorption temperatures investigated. The maximum adsorption amounts of o-CNB in HZSM-5 zeolite were, however, markedly lower than those of p-CNB at different adsorption temperatures. Diffusion results revealed that the diffusivity of p-CNB at 300K was about 100 times higher than that of o-CNB in HZSM-5 zeolite. The remarkable difference in the adsorption amounts and diffusivities between p-CNB and o-CNB resulted in separation factors of 463.6, 96.8 and 21.9 for p-CNB at 278, 300 and 323 K, respectively, indicating a selective adsorption of p-CNB in HZSM-5 zeolite from the aqueous mixture of p- and o-CNB.