敞开式太阳能集热/再生器的理论模型及性能分析

对敞开式太阳能集热再生器建立理论解析模型,理论求解发现溶液在常温下再生时存在一个最佳单位面积流量使单位面积蒸发率最大。溶液入口温度和室外风速是决定最佳流量值的2个最重要参数,溶液浓度和太阳辐射强度对最大蒸发率影响最明显。当溶液出口温度低于入口温度时,最佳流量不存在,溶液流量越大再生效果越好。当室外风速为2m/s时,溶液再生蒸发率最大。文章全面揭示了影响敞开式集热/再生器性能的各项因素。     

浅谈促进项目结算收益提高的途径

从实际工作经验出发,着重从思想认识、基础资料、有效签证、材料认价、工程量核实、方式方法等措施入手进行论述,以寻找提高项目结算收益的途径,实现项目效益的最大化。     

从漳州市中心城区给水专项规划刍议城市给水工程规划用水量规模的确定

水是生命之源,城市给水系统是保证城市、工矿企业等用水的各项构筑物和输配水管网组成的系统,水在日常和生产生活中占有极其重要的地位,确定城市给水工程规划水量规模十分重要,本文就城市给水规划如何预测用水量等有关问题结合我市给水工程规划工程予以探讨。     

鞍钢鲅鱼圈3.8m中板厂房优化设计

针对鞍钢3.8 m中厚板生产线厂房跨度大、吊车吨位大、工艺布局要求严等难点,通过厂房方案比较、结构选型、材料选择、设计参数选优,工艺、土建、机电等专业会商进行设计优化。东北寒冷地区保温厂房含钢量通常约210 kg/m2,设计优化后降至165 kg/m2,降低约20%。此含钢量为目前同类厂房最低,取得较好的技术经济效果,可供同类厂房设计参考。     

房地产项目财务评价方法改进探索

指出了房地产项目与一般投资项目财务评价方法和评价指标存在的区别,分析了区别产生的原因和改进财务评价方法和评价指标的意义。提出了房地产项目总成本费用估算方法、经营收入估算方法、现金流量估算方法、财务评价指标的改进方案。     

Equilibrium between interest payments and income in the housing market

The literature on housing markets suggests that house prices in almost all western economies can be explained by short-run demand-oriented variables and a long-run term. The basic principles of the theory are that the short-run fluctuations, which are based on recent price developments (shocks), occur due to market imperfection, while over the long term, causality with such fundamentals as income will recover. Nonetheless, many of the interesting questions in housing economics concern adjustments toward equilibrium. This paper seeks to identify a long-run equilibrium between interest payments and household income (interest-to-income ratio) instead of between house prices and income (price-to-income ratio).

解大学校园规模之“忧”

针对近年来公众对新建大学校园规模的质疑,简要比较国内外大学发展与规模的关系,分析我国大学结构、发展目标对规模的要求,以及大学城宏观背景下学校用地规模可能发生的变化。从学生规模、后勤社会化、共享理念等方面探讨在校园建设新形势下如何合理确定校园用地规模,并结合城市用地分类、管理及近期建设探讨了规模调控对促进资源整合、集约共享,从而实现大学与城市良性互动的积极作用。     

Urinary mercury in adults in Poland living near a chloralkali plant

We conducted a study within the framework of the interdisciplinary European Mercury Emission from Chloralkali Plants (EMECAP) project to assess exposure to mercury (Hg) and the contribution of Hg emissions from a mercury cell chloralkali plant to urinary mercury (U-Hg) in adults living near the plant. We collected data from questionnaires and first morning urine samples from 75 subjects living near the Tarnow plant in Poland and 100 subjects living in a reference area. Median U-Hg was 0.32 mug/g creatinine (microg/gC) and 0.20 microg/gC, respectively. The median U-Hg was also higher in the amalgam-free subjects living near the plant (0.26 microg/gC) than in the reference group (0.18 microg/gC), but no such association was found in a multivariate analysis. There was a statistically significant positive association between U-Hg and number of teeth with amalgams, a negative association with age and a tendency towards higher U-Hg in female subjects. In the amalgam-free subjects there were statistically significant effects of female sex and fish consumption, and a negative association with age. The additional long-term average air Hg concentration from the plant, based on EMECAP environmental measurements and modelling, was estimated to be 1-3.5 ng/m(3) for the residential study area and should have a very small effect on U-Hg. The other Hg emission sources such as coal combustion facilities located nearby should be taken into account in assessing the overall impact of air Hg on U-Hg in this area.     

防雷设计应首先认真调查地质、气象等条件

总结了建筑物易遭雷击的14种情况,以一个发生雷击事故的工程为例,提出在进行防雷设计时,首先要对建筑物所处的环境、地理、地质、气象条件和雷电活动规律进行认真调查,凡符合这14种情况之一的,至少应按第三类防雷建筑设防。     

干盘管技术在办公类建筑中可实施性的静态分析

本文针对干盘管技术在办公类型建筑中的应用,静态分析了以下两个方面：人均新风量取值对新风系统的影响;人均新风量取值对风机盘管系统的影响。根据上述分析的结果,讨论了在办公类型建筑中应用干盘管技术存在的三大问题：人均新风量的取定问题;新风再热过程中能量回收问题;干盘管技术中冷冻除湿方法的应用问题。从而揭示了干盘管技术在办公类型建筑中的可实施性。