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621.
本文研制了一种可用于废水处理的新型阳极和阴极,研制电极电解处理离子染料色模拟液时,分解电压低,脱色率高,电能消耗少。 相似文献
622.
Soy isolate was treated with formaldehyde and glyoxal at 1.0, 2.5, and 5.0% (w/w isolate) and with adipic and acetic anhydrides. The materials were then compression-molded into plastic tensile bars and tested for tensile and yield strength, percentage elongation, Young's modulus, and water absorption. Treatment with 5% formaldehyde increased the tensile strength significantly, to 4.9 kg/mm2, compared with the untreated sample (3.7 kg/mm2). The yield strength increased slightly, to 0.68 kg/mm2. Elongation was significantly less after treatment with formaldehyde. Young's modulus increased after treatment and leveled off at 174 kg/mm2. Water absorption decreased as the formaldehyde concentration increased. Treatment with either glyoxal or adipic/acetic anhydride had a detrimental effect on the mechanical properties of the plastic specimens. Water absorption was decreased by glyoxal treatment but was not affected by adipic/acetic anhydride treatment. Long-fiber (lf), short-fiber (sf), and microcrystalline (mc) cellulose were incorporated into soy isolate at various levels. Cellulose addition decreased the percentage elongation and increased the rigidity of the plastic. All three cellulose additions increased Young's modulus. The tensile strength increased with the addition of sf-cellulose to soy isolate; lf-cellulose decreased the tensile strength, whereas the incorporation of mc-cellulose did not have a significant effect. The yield strength increased slightly with the addition of sf-cellulose and was less affected by the addition of lf- or mc-cellulose. All three types of cellulose slightly decreased water absorption at ca. 15% content.Journal Paper No. J-15563 of the Iowa Agriculture and Home Economics Experiment Station, Ames; Project No. 2863. 相似文献
623.
624.
洪水灾害损失信息系统—FLOODIS系统设计 总被引:3,自引:0,他引:3
本文借助遥感技术,设计出一个专题地理信息系统一洪灾损失信息系统FLOODIS,为损失评估模型提供评估区域洪水灾害损失的各种自然地理和社会经济信息以及经系统内专家模块处理后的专题信息,同时对其计算结果进行多种方式输出。 相似文献
625.
This report describes a study of stairway risk factors based on video tape recordings of workers using 31 flights of stairs selected from among the industries with the highest frequency and severity rates for stair-related injuries. The video tapes were reviewed to identify all incidents, i.e., falls, trips, slips, missteps, and moments of temporary instability. The characteristics of the 98 stair users who were involved in an incident were compared to the characteristics of a matched group of stair users who did not have incidents. The factors that best discriminated between the incident group and the nonincident group were: (a) The incident group tended to be those whose movement was impeded by others and who were older; and (b) The nonincident group tended to be those who were wearing glasses and those who were very large or heavy individuals. The influence of stairway physical features on the risk of injury was examined using correlation analysis. The measure of risk was the incidence rate (observed incidents per number of observed uses) for each flight as well as for each tread. Among the several variables significantly correlated with higher incidence rate are: (a) higher effective riser height and less effective tread depth; the safest stairs have an effective riser height not greater than 7 in. (18 cm) and an effective tread depth no less than 11 in. (27 cm); and (b) for descent only (92% of the injuries), the size of the nosing projection; it appears that nosing projections that exceed in. (1.8 cm) are associated with higher incidence rates. 相似文献
626.
627.
陈万金 《中国安全科学学报》1995,(Z2)
分析论述了YXKC型除尘器在最佳入口风速下的阻力计算方法及其影响,指出了进一步研究和改进设计的方向与途径。 相似文献
628.
按照校验费和损失费最小以及有效度最大的原则分别给出了安全监测系统校验的等周期模型。当安全监测系统的无故障工作时间服从威布尔分布时,给出了模型的解法。 相似文献
629.
630.
膜生物反应器废水处理新工艺 总被引:13,自引:0,他引:13
概述了国内外膜生物反应器的研究与应用状况;介绍了其构形与特点;分析了膜污染的成因,影响因素及防制措施;指出了今后的研究方向。 相似文献