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1.
用全自动量热仪RC1e测定了N–丁基硝氧乙基硝胺合成中两步硝化反应的热释放速率、传热系数以及比热容等热力学数据。结果表明,两步硝化反应的摩尔反应热分别为126 k J/mol和118 k J/mol,绝热温升分别为193 K和87 K。  相似文献   

2.
叠氮硝胺对硝基胍发射药热行为的影响   总被引:1,自引:0,他引:1  
用叠氮硝胺(DIANP)替换硝基胍(NQ)发射药中部分(质量分数6%)硝化甘油(NG)制备了一种含叠氮硝胺的硝基胍发射药。通过高压差示扫描量热法、爆发点试验、甲基紫试验、真空安定性试验和热加速老化试验研究了DIANP对NQ发射药热行为的影响,用Kissinger方程和Ozawa方程计算了发射药样品分解反应的表观活化能(Ea)。结果表明,少量DIANP使NQ发射药的热安定性稍有改善;Kissinger方程和Ozawa方程计算NQ发射药的Ea值分别为327和318kJ/mol,含DIANP的NQ发射药的Ea值分别为196和194kJ/mol,两者的等动力学点(Tik)为172.9℃,表明DIANP能够降低NQ发射药高温下的分解反应速率,即DIANP在一定程度上可以调节NQ发射药的燃速。根据温度系数法预估的含DIANP的NQ发射药和NQ发射药在30℃下的安全贮存寿命分别不少于31年和23年,表明加入少量DIANP可延长NQ发射药的安全贮存寿命。  相似文献   

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4.
《精细化工中间体》2007,37(1):14-14
<正>本发明方法包括如下步骤:1)将三聚氯氰加入到有机溶剂中搅拌混合均匀,加入第一种胺,以碱中和反应释出的氯化氢,反应完全后,去除水相;然后,加入第二种胺,再加碱中和反应释出的氯化氢,反应后分离得到中间体丙丁津;所述第  相似文献   

5.
讨论了大型电站具有随机时变特性过程的状态监测与故障诊断。基于多变量统计过程(MSPC)理论的主元素分析(PCA)技术,分辨故障事件的原因与结果。为适应随机时变特性的过程特点,将典型的PCA与改进的递推和快速滑动窗型PCA算法进行了比较。给出了递推快速滑动窗型算法(MWPCA),通过与典型的PCA算法在故障诊断应用中的比较,表明了新算法对过程特性变化的自适应能力和计算效率。给出了在现代电站过程中应用FMWPCA算法将诊断与过程特性变量结合的图示方法应用实例。  相似文献   

6.
The effect of a novel active nucleating agent(TBC8-eb) on the isothermal crystallization of poly(L-lactic acid) (PLLA) was studied by differential scanning calorimetry(DSC) and Fourier transform infrared spectroscopy(FTIR) . The analysis on kinetics demonstrates that TBC8-eb can not only accelerate the crystallization rate but also transform most of the original spherulite crystals of PLLA into sheaf-like crystals. Furthermore,the free energy of folding(σe) of PLLA and PLLA with TBC8-eb is 0.15 and 0.06 J·m-2,respectively,which suggests that the addition of TBC8-eb favors the regular folding of molecule chains in the crystallization of PLLA,improv-ing its crystallization rate. The FTIR results show that TBC8-eb can accelerate the conformational ordering of PLLA in the isothermal crystallization. The conformational ordering of PLLA nucleated with TBC8-eb begins with the interchain interaction of CH3,and then a short helix emerges where a couple of CH3 groups interact.  相似文献   

7.
佘文武 《聚氨酯》2007,(8):98-100
本文先分析了对于市场驱动力因素,然后分别建立了动态和静态的预测模型。其中动态模型由于不具有较高的可操作性而被否定,静态模型被证实具有较高的准确性,该模型粗略理论预测精度在[2/3,5/6)之间。  相似文献   

8.
EPC项目的管理模式是降低投资人投资风险的有效途径,在国际上很通行,进度费用控制是其中的重要管理内容之一。尽管影响项目成败的因素很多,但进度费用控制是最重要又最复杂的环节,是监控项目是否健康运行的关键。  相似文献   

9.
Chemical processes are complex, for which traditional neural network models usually can not lead to satisfactory accuracy. Selective neural network ensemble is an effective way to enhance the generalization accuracy of networks, but there are some problems, e.g., lacking of unified definition of diversity among component neural networks and difficult to improve the accuracy by selecting if the diversities of available networks are small. In this study, the output errors of networks are vectorized, the diversity of networks is defined based on the error vectors, and the size of ensemble is analyzed. Then an error vectorization based selective neural network ensemble (EVSNE) is proposed, in which the error vector of each network can offset that of the other networks by training the component networks orderly. Thus the component networks have large diversity. Experiments and comparisons over standard data sets and actual chemical process data set for production of high-density polyethylene demonstrate that EVSNE performs better in generalization ability.  相似文献   

10.
使用溶胶–凝胶法成功制备了稀土离子(Eu~(3+)或Tb~(3+))掺杂的SrB_6O_(10)发光材料,研究了SrB_6O_(10):RE(RE=Eu~(3+),Tb~(3+))发光材料在真空紫外(VUV)光激发下的发光性质。通过对样品激发光谱的分析,发现SrB_6O_(10):RE(RE=Eu~(3+),Tb~(3+))在真空紫外区域有1个较强的基质吸收峰,这表明SrB_6O_(10):RE(RE=Eu~(3+),Tb~(3+))在VUV激发时有较好的发光效果。SrB_6O_(10):Eu~(3+)和SrB_6O_(10):Tb~(3+)样品的淬灭浓度分别达到30%和25%。SrB_6O_(10):Eu~(3+)与商用KX–504A粉[(Y,Gd)BO_3:Eu~(3+)]相比具有更好的色纯度;而SrB_6O_(10):Tb~(3+)与商用粉Zn2Si O_4:Mn2+(KX–502)相比余晖时间更短。  相似文献   

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