工字形组合截面梁腹板的局部屈曲

为正确预测工字形组合截面梁的承载力,针对其腹板的局部屈曲问题进行了数值分析和试验.有限元分析表明梁腹板会在集中荷载下方发生局部屈曲或对无加劲肋的梁会在支座处发生局部屈曲.同时表明,正应力与剪应力基本呈线性关系,腹板上边缘处的局部压应力并不显著影响腹板的屈曲.采用硅橡胶制作模型梁,进行腹板屈曲试验,证明了数值分析结果的正确性.经对计算结果回归分析,给出了腹板屈曲计算公式的一种新形式.     

社区体育健身俱乐部及其志愿者队伍建设

介绍了社区体育健身俱乐部的作用和发展状况,分析了志愿者对于社区体育健身俱乐部发展的意义,探讨了社区体育健身俱乐部志愿者队伍建设的途径。     

丽春红S褪色分光光度法测定溴酸根离子的研究

在盐酸介质中,依据溴酸根离子氧化丽春红S褪色的原理提出了测定溴酸根离子的新方法,研究了测定的最佳条件.测定的最大吸收波长λmax为510nm,溴酸根离子在0.5～5.0μg／mL范围内符合比尔定律,线性回归方程为A510=0.3185ρ-0.0406,相关系数为0.99494,表观摩尔吸光系数为4.08×104L/（mol·cm）.该法可用于化学试剂中的微量溴酸根测定,结果满意.     

基于隐马尔可夫模型的协议识别技术

现有流媒体分发系统中流量管理和内容路由过程彼此独立,无法获得系统性能的最优解。在深入分析现有流量管理和内容分发过程的基础上,提出一种基于流量管理的内容路由方法。该方法中互联网内容提供商实时从服务提供商处获得拓扑及流量信息,实现内容路由过程的联合协同求解以最优化内容路由性能,从根本上实现了互联网内容提供商和服务提供商利益的最大化。     

聚碳酸酯用磺酸盐阻燃剂研究进展

介绍了聚碳酸酯(PC)的性能及其常用的阻燃剂,重点为磺酸盐系阻燃剂,目前工业上常用的有KSS、PPFBS、STB 3种.讨论了磺酸盐系阻燃剂的阻燃机理.根据磺酸盐系阻燃剂的应用现状及研究进展情况,预测了此类阻燃剂的发展方向.     

Toughening of polyethylene terephthalate/amorphous copolyester blends with a maleated thermoplastic elastomer

The toughening of polyethylene terephthalate (PET)/amorphous copolyester (PETG) blends using a maleic anhydride grafted mixture (TPEg) of polyethylene‐octene elastomer and a semicrystalline polyolefin plastic (60/40 by weight) was examined. The TPEg was more effective in toughening PETG than PET, although the dispersion qualities of the TPEg particles in PET and PETG matrices were very similar. At the fixed TPEg content of 15 wt %, replacing partial PET by PETG resulted in a sharp brittle‐ductile transition when the PETG content exceeded the PET content. Before the transition, PET/PETG blends were not toughened with the TPEg of 15 wt %, whereas after the transition, the PET/PETG blends with 15 wt % of TPEg, similar to the PETG/TPEg (85/15) binary blend, maintained a super‐tough level. The impact‐fractured surfaces of the PET/PETG/TPEg blends were also evaluated. When PETG content was lower than PET content, the ternary blend showed a brittle feature in its impact‐fractured surface, similar to the PET/TPEg (85/15) binary blend. While PETG content exceeded PET content, however, the impact‐fractured surface of the ternary blend was very similar to that of PETG/TPEg (85/15) binary blend, exhibiting intensive cavitation and massive matrix shear yielding, which were believed to be responsible for the super‐tough level of the blends. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 797–805, 2003     

关于锦屏磷矿四期工程与地面发展问题的探讨

分析了锦屏磷矿四期延深工程的特殊性，介绍了该矿有关地面改造工程的有关情况，提出了下一步打算。     

昆虫抗性靶标部位及其在杀虫剂创制中的作用

本文从昆虫抗药性机理出发,重点评述了三种具有潜在开发价值的杀虫剂靶标部位(GABA受体,电压敏感性钠通道和乙酰胆碱酯酶),介绍了几种具有新颖作用机制的、无交互抗性的新农药品种,最后讨论了新杀虫剂创制的新途径及其意义。     

Deacetylation of β‐chitin. II. Factorial experimental design

A 2³‐factorial experimental design has been used to study the main, two‐factor‐interaction, and three‐factor‐interaction effects of the NaOH concentration (X₁), deacetylation time (X₂), and deacetylation temperature (X₃) on the degree of deacetylation (DD) of deacetylated products prepared from β‐chitin. Because the DD values of deacetylated products increase as X₁, X₂, or X₃ increases, the main, two‐factor‐interaction, and three‐factor‐interaction effects for these three deacetylation conditions are positive. The sequence of the main effects on the DD values of deacetylated products is X₃ < X₂ < X₁. The sequence of the two‐factor‐interaction effects on the DD values of deacetylated products is X₂ versus X₃ < X₁ versus X₃ < X₁ versus X₂. The prediction equation is ? = 42.4 + 13.9X₁ + 9.4X₂ + 8.4X₃ + 5.8X₁X₂ + 4.9X₁X₃ + 3.7X₂X₃ + 2.6X₁X₂X₃ (where ? is the predicted response) © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 2423–2428, 2004     

化学捕收絮凝沉降废水中铅离子的研究

本文采用铜试剂作为废水中铅的化学捕收剂，以明矾(alum)和PAM为复合絮凝剂沉降络合物胶体，取得了很好的效果。常温下，调节pH值为6．0，在最优化的配比时，铅的去除率在98％以上。尤其当水中铅的浓度低于100mg/L时，经过该方法处理的水，铅的浓度低于1．0mg/L，符合GB8978-1996一类污染物的排放标准；本方法处理废水中的铅，生成的絮体粒径大，强度高，适宜于沉降分离，沉降时间在30min左右。