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使用无烟药裂解产物的气相色谱分析对它进行特性鉴定可能是法庭检查人员可选择的最重要的方法。分析低含量组分的方法被确定是区别各种火药的一种快速而准确的方法,但是测定所需样品量和伴随表面涂层燃烧而发生的化学反应,却限制了该方法用于实际上并未发生化学变化的火药残留颗粒的分析上。用热分析方法检测火药虽然能够减少样品用量,但这种方法的选择性不高,而且在测定部分燃烧的火药时有其局限性。可是用裂解气相色谱鉴定火药,其优点就在于它只需要少量样品,而且可以检测在不同批号火药中含量变化范围相当大的同类组分。 相似文献
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使用无烟药裂解产物的气相色谱分析对它进行特性鉴定可能是法庭检查人员可选择的最重要的方法。分析低含量组分的方法被确定是区别各种火药的一种快速而准确的方法,但是测定所需样品量和伴随表面涂层燃烧而发生的化学反应,却限制了该方法用于实际上并未发生化学变化的火药残留颗粒的分析上。用热分析方法检测火药虽然能够减少样品用 相似文献
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用热力学基本原理分析了火药绝热定容燃烧的过程和状态,提出火药力是状态函数,与作功过程无直接关系。另从气体分子运动论热量按分子运动自由度分配原理分析了火药力、定容爆热的本质和两者间的关系,并进行了数值计算,最后得出火药力的物理含义,供同行参考。 相似文献
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为研究火药的实际燃烧规律,建立了定容条件下火药燃烧的修正数学模型,分析了火药实际弧厚的分布及变化、点火不同步和燃速系数变化等因素对火药实际燃烧规律的影响。在此基础上,用考虑综合因素的修正数学模型对定容条件下火药的实际燃烧过程进行了模拟,计算值与实验结果具有较好的一致性,说明修正模型所建立的假设及处理方案是合理的。 相似文献
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以气煤、肥煤、焦煤、瘦煤为样煤,进行了样煤的粉碎、有机溶剂溶胀和硝酸氧化处理,考察了处理后煤样中的药用腐植酸得率。结果表明,吡啶和N,N-二甲基吡咯烷酮是溶胀较好的溶剂;样煤粉碎后,随着粒度的减小,煤的溶胀率增加;粒度粉碎至200目的气、肥煤经吡啶溶胀和硝酸氧化后,煤样的药用腐植酸得率可达到73.0%和71.4%,而经甲醇溶胀和硝酸氧化的200目气煤药用腐植酸得率为56.4%和58.4%。实验结果表明,煤样经过溶胀和硝酸氧化处理,对药用腐植酸的提取有促进作用。 相似文献
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从硅晶体变形的力学基础、晶体变形力学模型、力能流的粉碎效能、硅晶体粉碎过程4方面深入阐述了冲旋对撞粉碎技术的微观理论基础。 相似文献
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Qianqian Guan Hua Li Yuting Qi Wenlong Zhang Lina Liu Bin Qiu 《Drying Technology》2013,31(12):1551-1562
AbstractThis study aimed to understand and establish changes in the physicochemical properties of yam powder with different processing methods, and select a suitable method for use in the development of hypoglycemic functional foods. Samples were dried using three methods, namely hot air drying, vacuum freeze drying, and microwave vacuum drying, and turned to powder using two smashing methods, namely ordinary smashing and superfine smashing (SS). Color changes, polarized light microscopy, differential scanning calorimetry, X-ray diffraction, polysaccharide dissolution rates, α-glucosidase inhibitory activities, glucose dialysis retardation indexes, and digestive characteristics were measured. The results showed that the drying method and the smashing method had significantly different effects on the physicochemical properties and digestion characteristics of the yam powder. Freeze-dried yam retained more nutrients, while SS increased the rapidly digestible starch content, reduced the digestible starch and resistant starch contents, and increased the polysaccharide dissolution rate in the yam powder samples. Six samples were compared using principal component analysis, with the highest composite score observed for the samples treated by freeze drying coupled with SS, followed by hot-air drying coupled with superfine smashing (HAO). 相似文献
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F. -X. Jetté S. Goroshin A. J. Higgins J. J. Lee 《Combustion, Explosion, and Shock Waves》2009,45(2):211-217
Samples of zinc-sulfur and manganese-sulfur mixtures are shocked using an explosive pentolite charge to investigate if a shock-initiated
reaction is able to support continued shock wave propagation. Samples of two different nominal densities (62 and 86% of theoretical
maximum density) are prepared as weakly confined cylinders 50 mm in diameter and are instrumented along their length (⩽280
mm) with sensitive piezoelectric pins. Experimental results showed that the shock wave transmitted into the sample by the
explosive rapidly decays to an acoustic wave in all four sample types. Furthermore, in denser samples, the part of the sample
farthest from the explosive is recovered intact and unreacted, which clearly indicates that the wave is unable to trigger
reactions after 100 mm of travel along the sample. Thus, it is concluded that insufficient reaction energy is transmitted
forward to the shock wave to prevent its decay as it travels along the sample.
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Translated from Fizika Goreniya i Vzryva, Vol. 45, No. 2, pp. 116–123, March–April, 2009. 相似文献
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RDX/Al超细复合粒子的制备及性能研究 总被引:4,自引:0,他引:4
为了研究超细与复合途径对炸药性质的影响,运用YLG型高效研磨制备出RDX/Al超细复合粒子,并以水和乙醇作研磨介质进行了比较研究,并对复合粒子粒度,粒子形貌、热力学性能,粒子组分及爆热等进行了较全面的研究,结果表明,在水中研磨有助于粒子的复合,而在乙醇中研磨则有利于粒子的超细化和分散,在乙醇中研磨样品由于高能物质(C2H5O)3Al的生成,其爆热提高明显。为了解释这些现象,提出了超细复合模型及超细RDX/Al复合炸药热分散模型,其结论与实施结果相符合。 相似文献
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RicardoA.L. Mendes JosL.S. deA.Campos IgorY. Plaksin JoseM.B.M. Ribeiro 《Propellants, Explosives, Pyrotechnics》2004,29(3):146-149
In order to characterize the initial phase of the divergent detonation wave in PBX, a hemispheric explosive sample was initiated by a long cylindrical charge of the same explosive. The tested PBX is composed of 85 wt% of RDX and 15 wt% of binder based on HTPB. This PBX‐RDX presents an effective density of 1.57 g/cm3, and a detonation velocity of 7.90 mm/μs. 相似文献
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钯-炭催化剂损坏的原因 总被引:1,自引:0,他引:1
通过对PTA加氢反应器中的钯 炭催化剂损坏原因的分析 ,找出了保护钯 炭催化剂的有效措施 ,从而有效地保护了催化剂 ,稳定了加氢反应器的操作 相似文献
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V. V. Burtsev A. L. Mikhailov K. N. Panov A. V. Rudnev M. A. Syrunin 《Combustion, Explosion, and Shock Waves》2011,47(3):350-356
Detonation initiation in a composite explosive based on HMX and TATB loaded by a divergent shock wave was studied on a U-70
proton accelerator using proton radiography. Density distributions behind the initiating shock front at various times were
obtained. Detonation failure due to collision of shock and detonation waves was studied for a plastic-bonded TATB sample using
radiography. Characteristic features of the explosive transformation under shock-wave loading were determined from the images
obtained. 相似文献