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高速排水型船支架空化观测 总被引:1,自引:1,他引:0
本文介绍了在水动力学国防科技重点实验室进行的一次空化观测试验。试验对象是一般高速排水型船,观测区域是单臂支架和双臂支架。通过不同减压民政部下的空化试验,发现单臂地有可能发生空化,这为合理设计支架提供了依据。 相似文献
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Nanotechnology is a rapidly growing science of producing and utilizing nano-sized particles. These nanomaterials are already having an impact on health care. Nowadays we are using nanoproducts in various fields,and this leads to direct and indirect exposure in human. Skin is the largest organ of the body and functions as the first-line barrier between the external environment and the internal organs of the human body. Then people worry about the nanoparticle(NP) small enough to penetrate the skin. The potential of solid NPs to penetrate the stratum corneum and to diffuse into underlying structures raises a considerable health and safety issue for their topical use. We review the current state of knowledge on the potential risk to human health presented by skin penetration of NPs nanotechnologies, and explore the robustness of current research strategies and directions to ensure the development of "safe" and publicly accepted nano-based products and technologies. 相似文献
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王莉萍 《郑州铁路职业技术学院学报》2003,15(2):61-61,65
随着人类社会的进步,包装成了人们较为重视的方面。儿童商品的包装作为包装专业的一部分,是不可忽视的。由于儿童是个特殊的消费群体,针对他们的特点,包装的设计一定要做到有的放矢针对性的设计,这样才能更加抓住这部分消费者的心。 相似文献
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叙述了船模纯粹自航随动系统装的原理与设计特点,给出了原理框图。这种中以用于船模纯粹自航试验也可用于船模强迫自扩航试验。测试数据信号可由拖车上的计算机采集与屏幕显示,也可通过拖车滑线或船池内的激光通道传送到池外的操纵台进行处理。应用该仪器对一艘双桨船模进行了船模强迫自航试验和船提纯粹自航试验的验证,给出了试验结果。 相似文献
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