Transformation of Crystal Phase of Micron-sized Rutile TiO2 and Investigation on its Sonocatalytic Activity

The partial transformation of crystal phase of micron-sized TiO₂ powder from rutile to anatase was realized utilizing microwave irradiation in hydrogen peroxide solution. Afterwards, the ultrasound of low power was used as an irradiation source to induce the transition crystal TiO₂ powder to perform the sonocatalytic activity through the degradation of azo fuchsine in aqueous solution. The results show that the sonocatalytic activity of the transition crystal TiO₂ powder is obviously higher than that of pure micron-sized rutile and anatase TiO₂ powders. The degradation ratio of azo fuchsine in the presence of the transition crystal TiO₂ powder attains nearly 80% within 80 min ultrasonic irradiation.     

高分子金属配合物发光材料的制备技术进展

高分子金属配合物发光材料是一类很有价值的功能材料,评述了有关它的各种合成方法。以金属离子与含配位基团的聚合物进行反应,容易在高聚物之间形成交联,难以获得发光强度高的高分子配合物;使金属离子与高分子配体和小分子配体同时作用,可以得到荧光强度比较理想的产物,但反应难以定量控制;以小分子金属配合物单体与某些单体之间进行共聚合反应,也可获得荧光强度较高的高分子配合物,但聚合反应的空间位阻较大;通过两端都含有配位基团的刚性链的有机小分子配体直接与金属离子配合形成高分子金属配合物;以小分子金属配合物单体进行均聚或者将小分子金属配合物接枝到高聚物上也可以形成高分子金属配合物。     

Fischer–Tropsch synthesis over Co–SiO2 catalysts prepared by the sol–gel method

Fischer–Tropsch synthesis was carried out in slurry phase over uniformly dispersed Co–SiO₂ catalysts prepared by the sol–gel method. When 0.01–1 wt.% of noble metals were added to the Co–SiO₂ catalysts, a high and stable catalytic activity was obtained over 60 h of the reaction at 503 K and 1 MPa. The addition of noble metals increased the reducibility of surface Co on the catalysts, without changing the particle size of Co metal significantly. High dispersion of metallic Co species stabilized on SiO₂ was responsible for stable activity. The uniform pore size of the catalysts was enlarged by varying the preparation conditions and by adding organic compounds such as N,N-dimethylformamide and formamide. Increased pore size resulted in decrease in CO conversion and selectivity for CO₂, a byproduct, and an increase in the olefin/paraffin ratio of the products. By modifying the surface of wide pore silica with Co–SiO₂ prepared by the sol–gel method, a bimodal pore structured catalyst was prepared. The bimodal catalyst showed high catalytic performance with reducing the amount of the expensive sol–gel Co–SiO₂.     

聚氯乙烯塑料中多种邻苯二甲酸酯类增塑剂的同时测定

为了在线监控聚氯乙烯塑料中增塑剂的含量,利用傅立叶变换红外光谱法-ATR技术测定样品的红外光谱,采用偏最小二乘法对所测红外光谱进行分析,建立了一种无损快速分析方法,定量地测定聚氯乙烯塑料中多种邻苯二甲酸酯类增塑剂的含量。该方法测量精密度的变异系数小于6%,测量准确度的变异系数小于3%。该方法不受基体的干扰,简单快速,适合于流水线的质量控制。     

有限元方法在离心机转鼓强度分析中的应用

在回顾以往转鼓强度分析的基础上 ,指出了目前转鼓有限元应力分析所存在的问题 ,给出了提高计算精度和保证模拟有效性的注意事项 ,并探讨了转鼓强度评定准则     

皮带输送机落料点和中转站抑尘装置技改

皮带输送机落料点和中转站粉尘污染治理一直是企业头痛的顽疾问题，并且随着现代化和工业化的发展进程，大气污染日益严重，工业粉尘是大气污染的重要污染源，扬尘综合整治迫在眉睫。通过皮带输送机中转站扬尘分析及技术攻关，采取有效措施，解决了这一问题及困境，为同行业有类似工况的企业提供参考。     

Muscular fatigue and maximum endurance time assessment for male and female industrial workers

A single arm pushing experiment was conducted in an electronic factory in Yantai, China to assess muscular fatigue using the theoretical models of muscular strength and maximum endurance time (MET) developed by Ma et al. (2009). Seventy seven workers, including 38 males and 39 females, participated in the study. The muscular strength of pushing was measured after the subject pushed a stick, with a force of 2.5 kgf, for 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0 min. Fatigue rate was determined based on a regression approach. In addition to the theoretical model, the MET for such a pushing task was also determined using four empirical models in the literature. The results indicated that females were more resistant to muscular fatigue than males in the pushing task. The results of the muscular strength prediction show that the predictability of the muscular strength model is acceptable. The prediction errors for muscular strength for female subjects were significantly lower than those of the male subjects. The predicted MET using the theoretical model, with a group constant k, was highly correlated with those using the empirical models compared in the current study.     

氯酸钠-硫磺法制二氧化氯的研究

对硫磺还原氯酸钠制备二氧化氯的工艺条件进行了研究 ,反应的最佳条件是 :温度为 60～70℃ ,氯酸钠浓度为 4～ 5 mol/L,反应液中维持硫酸浓度为 1 mol/L以上。该法具有反应温和易于控制、硫酸消耗少、成本低廉和产品纯度高的优点     

中微孔复合分子筛的合成研究开发进展

综述了复全分子筛合成的研究进展，介绍了原位合成法，离子交换法和纳米组装法。分析比较了各种合成方法的特点，讨论了方法的适用范围，指出复合分子筛的合成中存在的一些问题，认为合成具有大－中－小孔梯度分布的复合物和用硅铝纳米簇进行自组装合成中孔材料将是今后发展的主流。     

SiO_2对低温液相法制备锐钛型TiO_2/SiO_2纳米复合膜性能的影响

采用浸渍提拉法在玻璃表面制得SiO2/TiO2纳米复合膜,筛选出SiO2∶TiO2优化摩尔比为0.1∶1。结果表明,加入SiO2可有效提高TiO2膜层均匀性,降低晶粒直径,纳米复合膜对甲基橙溶液光催化降解率为38.58%,光照30min后膜接触角为5(°),纳米膜与玻璃之间附着力达到1级,且对各类介质均具有良好的耐蚀性。