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江泽民同志在党的十六大报告中指出:“创新是一个民族进步的灵魂,是一个国家兴旺发达的不竭动力,也是一个政党永葆生机的源泉”。为人们指明了创新对一个国家、一个民族、一个政党、乃至任何一个组织的重要性。 相似文献
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一、量子理论的认识论在火炸药化学中,不论是发射药(单基、双基或多基)、推进剂,还是各类混合炸药,它们都是一个混合物。对于这类混合物的变化,不仅是一个化学问题,而且还是一个物理问题。其变化表现于宏观,实质上是一个较为复杂的微粒变化。有关量子化学这样一个物理学 相似文献
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于振凡 《中国石油和化工标准与质量》1991,(3)
第五部分合格质量水平AQL的确定方法 1.确定AQL的一般原则同判断一个单位产品合格与否要有一个质量标准一样,判断一个检查批合格与否同样需要一个质量标准。在GB2828中这个标准就是合格质量水平AQL。因此,所谓AQL,就是判断检查批合格与否的一个标准、一个水平、一个质量界限。即产品批的质量劣于AQL时应判为不合格,优于AQL时 相似文献
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安全的重要性,安全生产的话题,我们每天在电视、网络、报纸上都能看到。人的生命只有一次,人身安全是同一个人、一个家庭、一个企业、一个国家乃至整个社会联系在一起。如果一个人的人身安全都没有保障,他还有心情去看蓝天白云吗?如果一个家庭中人员的人身安全都没有保障,这个家庭会幸福吗? 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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In the present article, chitin from crab shell was systematically deacetylated using a NaOH treatment with control of the reaction time. The degree of deacetylation, monitored using solid-state NMR, revealed that the reaction was pseudo-first order. Based on this, swollen and NaOH-saturated particles are proposed as the reaction system. The weight loss of the partially saponified and neutralized samples after HCl hydrolysis increased linearly with the degree of deacetylation. The crystallinity of the samples was found to increase after acid hydrolysis. According to conductimetric titration, the surface charge density of the crystallites, after acid hydrolysis, was found to increase with base treatment time. The effect of surface charge on the formation of a chiral nematic phase, due to the rodlike nature of the crystallites, was explored. These results show that because the contribution of charged particles to the ionic strength was significant the double layer compression was affected, especially since the surface charge density was close to the Manning limit. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65:373–380, 1997 相似文献
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在安全生产系统中,人的素质是占主导地位的,人的行为贯穿生产过程的每一个环节。企业安全要以人为核心,树立人本观念。安全管理必须重视人的因素,提高人的素质,从精神上、物质上关心人尊重人,以有效的手段约束和激励人,加大安全投入、落实有效措施,保障个人的利益,使大家找到归属感,保护员工身体健康和生命安全,最终形成安全管理"命运共同体",推动企业发展和提高。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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徐善明 《现代塑料加工应用》2008,20(5)
应用管理学和市场营销学的基本原理和方法,深入分析我国聚丙烯工业的内部和外部环境、市场状况以及加入WTO后所面临的机遇与挑战.在此基础上,应用SWTO(态势分析法),确认出主要的优势和劣势、机会和威胁,对我国聚丙烯工业的国际竞争力进行结构化的综合分析. 相似文献
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A. A. Konnov 《Combustion, Explosion, and Shock Waves》2005,41(5):496-503
A simple phenomenological diffusive-thermal model of cellular instability of premixed flames of ternary mixtures is developed
and presented. The model shows that preferential diffusion can alter stoichiometry of the mixture, i.e., the ratio of the
fuel and oxidizer concentrations, and also its effective dilution by an inert. Key parameters of the model are estimated using
numerical modeling of burning velocities. Laminar burning velocities are calculated for hydrogen-oxygen-nitrogen, methane-oxygen-nitrogen,
and propane-oxygen-nitrogen mixtures. Conditions for the appearance of cellular instability in ternary mixtures are determined
and compared with experiments. In good agreement with experimental observations, the diffusive-thermal instability is predicted
in hydrogen flames with equivalence ratios φ ≲ 1.45, in lean methane flames with φ ≲ 1.02, and in rich propane flames with
φ ≳ 1.03. The magnitude of the change in the local flame velocity due to preferential diffusion is evaluated. It is demonstrated
that nitrogen diffuses faster than oxygen in hydrogen-air and methane-air flames, while oxygen diffuses faster than nitrogen
in flames of propane and other heavier hydrocarbons. In mixtures of air with propane or heavier hydrocarbons, the transition
between stable and unstable regimes is predicted in mixtures that are leaner than the mixture corresponding to the peak of
the burning velocity curve, in agreement with experimental observations.
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Translated from Fizika Goreniya i Vzryva, Vol. 41, No. 5, pp. 14–22, September–October, 2005. 相似文献
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茚酮化合物广泛存在于许多天然产物中,这类化合物具有多种生理活性,是重要的有机合成中间体,广泛应用于医药、农药、染料的合成等。本文重点介绍了环化法合成茚酮化合物,其中分子内傅雷德尔-克瑞福斯(Friedel-Crafts)环化法是茚酮化合物的经典合成法,该法优点是技术成熟,后处理较简单,易于工业化,但该方法产生大量的含铝废液,对环境造成污染。同时,文章对近年来出现的新的茚酮化合物合成方法,如重排法、光化法等进行了对比讨论,新方法与经典合成法相比,具有条件温和、步骤少、产物纯度高等优点,但受到所用原材料等条件的限制,其工业化进程不易实现。通过对近十几年来茚酮化合物合成方法的系统化讨论,指出开发绿色环保、原子经济、易于工业化的新的茚酮化合物合成方法是今后研究的重点。 相似文献