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铸造铝合金熔炼过程的质控原理与实践
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作者 皮远岸 《科技创新与应用》 2014年第14期18-19,共2页
在铸造铝合金产品的生产实践中,根据数据对比及理论分析笔者得出了以下结论:即铝合金在进炉熔炼到进机压铸前这个阶段的工艺控制好坏将直接影响到产品合格率的高低。如果失控在产品上主要的失效模式是气孔和杂质含量会成倍增加,而这些... 在铸造铝合金产品的生产实践中,根据数据对比及理论分析笔者得出了以下结论:即铝合金在进炉熔炼到进机压铸前这个阶段的工艺控制好坏将直接影响到产品合格率的高低。如果失控在产品上主要的失效模式是气孔和杂质含量会成倍增加,而这些缺陷在整个生产过程中属原始缺陷,就是说在其后的生产中再如何正确调整控制参数收效是不大的。气孔将造成产品渗漏及强度降低而报废,杂质将造成合金力学性能降低特别是延伸率、冲击韧性及疲劳强度。因此如何控制好这一阶段将关乎到降低生产成本、提高生产效率、增强企业竟争力的大问题,下面根据作者的实践就控制的原理及方法做简要论述。 展开更多
关键词 铝合金 熔炼 质控原理
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质控图原理在纳氏试剂分光光度法测定氨氮的应用 被引量:1
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作者 梁灿辉 何敏华 《化工设计通讯》 CAS 2016年第4期2-2,15,共2页
地表水氨氮的变化是反映水体状况的一个重要特征。天然水体中有机物种类繁多,但从总体上看不外乎是由氢、碳、氮、磷、氧等元素组成的化合物。其中以氮素化合物最不稳定,当它进入水体时,由于外部环境和微生物的分解作用,其不断地发生着... 地表水氨氮的变化是反映水体状况的一个重要特征。天然水体中有机物种类繁多,但从总体上看不外乎是由氢、碳、氮、磷、氧等元素组成的化合物。其中以氮素化合物最不稳定,当它进入水体时,由于外部环境和微生物的分解作用,其不断地发生着生物化学变化,并逐渐演变成较简单的无机化合物。因此,常用氨氮和各种形态的氮化合物产生及变化来作为水体污染的依据指标。 展开更多
关键词 原理 纳氏试剂分光光度法 测定
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Conceptual Proposal of a Facility Design for Accommodating Minipigs for Pharmaceutical and Radiopharmaceutical Research
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作者 Elizabeth B. F. Lainetti Luiz Augusto C. Passos +1 位作者 Carlos R. J. Soares Nanci do Nascimento 《Journal of Civil Engineering and Architecture》 2016年第8期881-887,共7页
The use of Animal House Facilities of IPEN-CNEN/SP (Nuclear and Energetic Research Institute-National Nuclear Energy Commission/SP, Brazil) has provided rats and mice with controlled sanitary quality for research an... The use of Animal House Facilities of IPEN-CNEN/SP (Nuclear and Energetic Research Institute-National Nuclear Energy Commission/SP, Brazil) has provided rats and mice with controlled sanitary quality for research and quality control in the production of radiopharmaceuticals lots, produced at IPEN, following rules of CONCEA-Brazilian National Council for Animal Experimentation Control and approved in CEUA (Ethics Committee on the Use of Animals), before they are sent to hospitals and clinics spread out in Brazil, for use in nuclear medicine. The production and the supply of high quality laboratory animals have fundamental importance for the accomplishment of vanguard scientific research, with reproducibility and universality. The quality of those animals depends, largely, on the available facilities for their production and lodging, to assure the demanded sanitary control and animal's welfare, in agreement with the ethical principles that control the activity. Therefore, the facilities design is of vital importance so that the mentioned requirements can be reached. Nevertheless, pigs and miniature pigs have gained importance as large animal models in medicine. With their size, organ capacity, and physiology resembling in several aspects that of humans, pigs are well suited for preclinical experiments and long-term safety studies. Minipigs will be used for preclinical testing of radiopharmaceuticals and assays radioactive materials for cardiac tests. This paper describes the premises and preliminary activities that have been performed at IPEN for the design of new Animal House Facilities dedicated to keeping minipigs taking into account fundamental aspects such as: animal's welfare, sanitation, genetic, in agreement with the ethical principles that control the activity and environmental concerns. 展开更多
关键词 Research animals minipigs HOUSING FACILITY design conceptual proposal.
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