风对桥梁结构稳定性的影响及其对策

桥梁风害是人们极为关心的问题之一。本文回顾了１８１８年以来世界上主要的桥梁风害情况，然后选取其中一典型的桥梁（Ｔａｃｏｍａ桥）风毁事例，详细分析了其毁坏的原因．指出了风对桥梁的作用形式及破坏方式；最后，对如何避免桥梁风害事故的发生提出了一些建议和对策。     

某厂房主体结构可靠性检测与鉴定

对己使用40年的老工业厂房，按现行《工业厂房可靠性鉴定标准》GBJ144－90进行了可靠性评定。     

硼铁合金烟尘静电治理试验研究

建立了针对硼铁合金烟尘治理的工况小型试验的静电实验装置，根据硼铁烟尘颗粒细，比电阻偏高，在高温下呈半流体状态的特性，如果采用常规除尘方法是难以治理的，而通过采用静电收尘新技术，对冶炼过程中产生的硼铁合金烟尘进行静电治理的试验研究，取得了良好的收尘效果，对于大型静电除尘器在硼铁合金行业的应用进行了有效的试验研究和可靠的实施依据。     

大风重现期的风险分析

目前结构抗风设计计算风荷载时所采用的设计风速,是根据重现期即所谓多少年一遇的概率来确定的,只考虑某一风速大风出现的概率,不考虑该大风出现的间隔时间是有一定的局限性的.对某一风速大风出现的间隔时间及其概率分布进行了研究,提出了一种大风重现期的风险分析方法.运用该方法,可以分析得出按年度出现某一特定风速大风的发生概率或风险率.     

阻燃涤棉混纺织物的研究与发展

对阻燃涤棉混纺织物的国内外研究状况、生产和应用中存在的问题,进行了论述,并提出了今后的发展方向。     

Biotechnology is compatible with sustainable agriculture

Biotechnology can provide appropriate new tools for use in solution of specific problems in sustainable agriculture. Its usefulness will depend in large part on the degree to which sustainable agriculturists understand the utility of biotechnology and apply it toward ends they deem important. Biotechnology can give little assistance to sustainable agriculture in the short term. It can be more useful in the medium term, and it could be highly useful in the long term as an integral part of the art and science of plant breeding and other components of sustainable agriculture systems.     

电除尘器接地系统行业标准解读

电除尘器接地系统的设计和施工,不仅会直接影响电除尘器性能和效率,也会影响其它控制系统的正常工作。本文从电除尘器的工作特性出发,解读了电除尘器标准中有关接地的各项要求,并希望通过此文能对规范电除尘器接地系统的设计和施工有所帮助。     

中信广场风场特性及风致结构振动的同步监测

通过对广州中信广场在台风“达维”作用下其风场与风致结构振动的现场同步监测，获得了台风风场和结构动力特性，及风致结构振动响应等相关结果。通过对现场测试数据的分析，验证了湍流强度随平均风速增大而减小和阵风因子随湍流强度增大而增大等规律，实测的脉动风速谱与von Karman谱亦很吻合。同时通过对中信广场加速度响应与平均风速关系分析得出，该高层建筑物的顶部风速即使处于低中风速范围时，其横风向响应已接近于顺风向响应。根据实测风振加速度数据，对结构动力特性（频率及阻尼比）进行了识别，采用随机减量方法求得了结构在两个主轴方向第一振型阻尼比与振幅的非线性关系。     

中国大陆地区年最大平均风速的概率密度函数

根据中国大陆地区1951-2002年的实测风速数据资料，采用密度演化方法进行了各站点年最大平均风速的概率密度函数估计，给出了大陆地区年最大平均风速均值和标准差的等值线分布图。与常用的基于拟合优度检验的概率密度函数估计和统计量分析不同，所提方法不需要进行先验分布类型的假定，可以通过直接计算给出与基本数据经验分布函数符合得较好的概率密度函数与概率分布函数。对比研究表明，该方法给出的统计结果是可信的，具有工程实用参考价值。     

Air Pollution Potential: Regional Study in Argentina

/ Air pollution potential is a measure of the atmospheric conditions that are unable to transport and dilute pollutants into the air, independently of the existence of sources. This potential can be determined from two atmospheric parameters: mixing height and transport wind. In this paper a statistical analysis of the mixing height and transport wind, in order to determine the areas with high or poor atmospheric ventilation in Argentina, is presented. In order to achieve this, meteorological data registered during 1979-1982 at eight meteorological stations were used. Daily values of the maximum mixing height were calculated from observations of daily temperatures at different heights and maximum surface temperature. At the same time as the maximum mixing height, the values of the transport wind were determined from the surface windspeed and the characteristics of the ground in the surroundings of each meteorological station. The mean seasonal values for both parameters were obtained. Isopleths of the mean seasonal of the maximum mixing heights were drawn. The percentage of seasonal frequencies of poor ventilation conditions were calculated and the frequency isopleths were also drawn to determine areas with minor and major relative frequencies. It was found that the northeastern and central-eastern regions of Argentina had a high air pollution potential during the whole year. Unfavorable atmospheric ventilation conditions were also found in the central-western side of the country during the cold seasons (37.5% in autumn and 56.9% in winter). The region with the greatest atmospheric ventilation is located south of 40 degrees S, where the frequency of poor ventilation varies between 8.0% in summer and 10.8% in winter.