共查询到19条相似文献,搜索用时 31 毫秒
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Ahmed Elbeih Svatopluk Zeman Marcela Jungov Pavel Vvra 《Propellants, Explosives, Pyrotechnics》2013,38(3):379-385
At present, cis‐1,3,4,6‐tetranitro‐octahydroimidazo‐[4,5‐d]imidazole (bicyclo‐HMX, BCHMX) and ε‐2,4,6,8,10,12‐hexanitro‐2,4,6,8,10,12‐hexaazaisowurtzitane (ε‐HNIW, CL‐20) are a topic of interest from the attractive and the potentially attainable nitramines. They were chosen to be studied in comparison with 1,3,5‐trinitro‐1,3,5‐triazinane (RDX) and β‐1,3,5,7‐tetranitro‐1,3,5‐tetrazocane (β‐HMX). Marginal attention is devoted also to 4,8,10,12‐tetranitro‐2,6‐dioxa‐tetraazawurtzitane (Aurora 5). BCHMX, ε‐HNIW, RDX, and HMX were studied as plastic bonded explosives (PBXs) with elastic properties based on Composition C4 and Semtex 10 matrices. Also they were studied as a highly pressed PBXs based on the Viton A binder. The detonation parameters and sensitivity aspects of these nitramines and their corresponding PBXs were determined. Relative explosive strengths (RS) of these compositions are mentioned with mutual relationships between the measured RS values and some detonation parameters. These relationships indicate a possibility of changes in detonation chemistry of these mixtures filled mainly by HNIW. A sensitivity of RS‐CL20 (HNIW with reduced sensitivity) is reported and the new findings in the friction sensitivity are discussed. 相似文献
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The forces of surface interaction between glass batch components are considered. A comparison between capillary and gravitational forces for particles of different sizes at different stages of glass batch preparation is carried out. The dependences of capillary force on the volume of liquid and the distance between particles are discussed.__________Translated from Steklo i Keramika, No. 3, pp. 7 – 9, March, 2005. 相似文献
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介绍一种利用互感器校验仪测试负载箱阻抗或导纳值的方法。从分析测试原理入手,详细图解如何具体利用广州羊城(或海纳)YC-52互感器校验装置实现对自身所带负载箱的测试。 相似文献
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冷制草浆瓦楞纸箱用快干淀粉胶 总被引:6,自引:1,他引:6
本文针对淀粉粘合剂应用现状,研制了一种冷制、快干、质量可调优、成本低的制胶新配方和工艺。介绍了制备方法,制备机理,PH值,氧化剂用量,糊化剂用量,干燥时间的优化控制等。 相似文献
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Sources of Apple Odor Attractive to Adult Plum Curculios 总被引:2,自引:0,他引:2
We evaluated olfactory attraction of overwintered plum curculio (PC) adults, Conotrachelus nenuphar, to volatiles from extracts of host and nonhost plant tissues in the laboratory using a still-air dual-choice bioassay system. In experiments evaluating four different solvents, hexane and water proved to be better than dichloromethane and methanol for extracting nonpolar and polar attractive compounds, respectively, from host McIntosh apple tissues. Significantly more PCs were attracted to volatiles from hexane extracts of host wild plum fruit at bloom, and host wild plum and McIntosh fruit at two weeks after bloom, than to volatiles from hexane extracts of nonhost honeysuckle fruit at either phenological stage. In every case, for hexane-extracted or water-extracted volatiles from McIntosh apple tissues (twigs, leaves, or fruit) at seven phenological stages of development (pink through five weeks after bloom), greatest numerical responses were recorded to volatiles from extracts made between bloom and two weeks after bloom. We conclude that source material used to identify volatile components of McIntosh apple odor attractive to PCs should be collected between bloom and two weeks after bloom. 相似文献
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David C. Robacker Jose A. Garcia Robert J. Bartelt 《Journal of chemical ecology》2000,26(8):1849-1867
Aqueous extracts of three types of bird feces were attractive to laboratory-colony Mexican fruit flies in laboratory bioassays. Extracts of black-bellied whistling duck feces were chosen for further analysis. Duck feces extract was attractive to both sugar-fed and sugar-starved flies but was more attractive to sugar-fed flies. Protein deprivation of flies had no effect on their response. Duck feces incubated in water for 24 hr were more attractive than those incubated for longer periods. Duck feces extract was attractive at pH 5–9, but was most attractive at pH 9, indicating that more than one class of chemicals contributed to attractiveness of the feces. Major components of headspace of duck feces extracts collected by solid-phase microextraction and identified by GC-MS, GC-FID, and GC-FTD included ethanol, propanol, phenol, ammonia, low-molecular weight amines, and pyrazines. In general, chemicals containing nitrogen proved most attractive to sugar-fed flies. However, dimethylamine and 1-pyrroline were nearly equally attractive to sugar-fed and sugar-deprived flies. Two chemicals without nitrogen were attractive to sugar-deprived flies; none were attractive to sugar-fed flies. A synthetic mixture was prepared containing ammonia, methylamine, dimethylamine, trimethylamine, 1-pyrroline, phenol, and 2-ethylhexanol in amounts found in odor of duck feces extract. The synthetic mixture was 96% as attractive as duck feces extract to sugar-fed flies and 80% as attractive to sugar-deprived flies. 相似文献