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Search Results: 1 - 10 of 12766 matches for " 许慎启 "
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碱金属对煤热解和气化反应速率的影响
熊杰,周志杰,许慎,于广锁
化工学报 , 2011,
Abstract: 通过对原煤、酸洗原煤、负载碱金属的酸洗原煤在800~1050℃热解制得焦样,用X射线衍射技术考察了碱金属对煤焦微晶结构的影响,在加压热天平(PTGA)上考察了煤样的热解过程,以及焦样的二氧化碳气化活性。结果表明:碱金属对煤的热解和气化阶段都有影响。在热解阶段,碱金属的存在抑制了煤焦的石墨化进程,降低了热解反应活化能,促进了热解反应的进行;在气化阶段,作为催化剂的碱金属,降低了气化反应活化能,延长了反应速率达到最大值的时间。修正的随机孔模型可以较好地描述煤焦-CO2的气化反应过程。
神府煤焦与CO2的气化反应动力学分析
许慎,周志杰,杨帆,于广锁,于遵宏
中国电机工程学报 , 2009,
Abstract: 利用加压热天平在1173~1323K、0.1~3MPa范围内,对神府煤焦与CO2的气化反应进行动力学分析。考察温度、压力对神府煤焦与CO2气化反应动力学特性的影响及气化反应速率和反应时间之间的关系,发现气化反应速率随反应时间的变化近似呈正态分布,建立了气化反应速率与反应时间的正态分布动力学模型。与随机孔模型对比,发现正态分布时间模型能较好地描述煤焦的气化动力学规律。由正态分布模型求得的反应速率常数r0、rm遵循Arrenius定律,lnr0、lnrm对1/T呈良好的线性关系;在0.1~3MPa范围,求得的反应活化能为150~185kJ/mol,与相关文献报道的结果基本一致。
煤及其拔头半焦的燃烧反应特性研究
于广锁,祝庆瑞,许慎,霍威,周志杰
燃料化学学报 , 2012,
Abstract: ?采用热天平研究了贵州褐煤、三江原煤及其拔头半焦的燃烧行为,考察了粒径和升温速率对样品着火点和燃烧稳定性的影响。减小样品的粒径可显著降低样品的着火点,改善样品的燃烧性能,在粒径100~120目和升温速率25℃/min下,样品的燃烧稳定性最好。根据coats-redfern方法求解燃烧反应动力学参数。燃烧反应动力学分析表明,三种样品的热天平燃烧反应均为一级反应,并得到了实验样品的燃烧反应动力学参数,表观活化能e和指前因子a。贵州褐煤的活化能为100.0~163.6kj/mol,三江原煤的活化能为73.4~161.2kj/mol,三江煤焦的活化能为68.3~178.1kj/mol。
高温下渣熔融对煤焦-co2气化反应特性的影响
吴加奇,许慎,周志杰,于广锁,王辅臣
燃料化学学报 , 2012,
Abstract: ?在sta449f3型热天平上采用等温热重法研究了加入不同比例粗渣的煤焦在反应温度900~1380℃的气化反应性。利用热重-差示扫描量热法(tg-dsc)对煤焦的热行为进行分析,主要考察了加入不同比例粗渣、反应温度对煤焦反应性的影响。结果表明,煤焦-co2反应过程中,气化反应性和碳转化率可根据煤灰熔融流动温度分为相对低温段和高温段。在低温段,加入粗渣增加了煤焦的气化反应性和碳转化率;在高温段,加入粗渣会减小煤焦的碳转化率,并当粗渣加入量超过一定比例时,会降低煤焦的气化反应性。气化初期反应速率可根据粗渣熔融流动温度分为低温区域的化学反应控制和高温区域的扩散控制。
中原油田社会保险统筹信息系统解决方案
许慎,徐小秋
计算机系统应用 , 1998,
Abstract: 本文阐述了“中原油田社会保险统筹信息系统”的建设情况,重点论述了基于Internet/Intranet技术的网络设计和应用软件的开发原则。
Effects of molten slag on coal gasification reaction with CO2 at elevated temperature
高温下渣熔融对煤焦-CO2气化反应特性的影响

WU Jia-qi,XU Shen-qi,ZHOU Zhi-jie,YU guang-suo,WANG Fu-chen,
吴加奇
,许慎,周志杰,于广锁,王辅臣

燃料化学学报 , 2012,
Abstract: The CO2 gasification reactivity of coal chars blended with different proportions of coarse slag were investigated by using an STA449F3 thermo-balance in the isothermal mode at the temperature range from 900 ℃ to 1 380 ℃.The thermal behavior of the sample was studied using thermo-gravimetric analysis and differential scanning calorimetry(TG-DSC),and the two regions(i.e.the low temperature region and the high temperature region) for the gasification reactivity and carbon conversion of coal chars were defined according to the flow temperature of coal ash fusion.The gasification reactivity and carbon conversion of coal chars with coarse slag added are improved in the low temperature region.But the addition of coarse slag decreases the carbon conversion,and the gasification reactivity of coal chars blended with coarse slag to certain ratio also decreases in the high temperature region.It is indicated that the initial gasification reaction of coal chars is chemically controlled in the low temperature region,and diffusively controlled in the high temperature region.
基于互信息的N维多模医学图像配准
刘晴,郭希娟,许慎
中国图象图形学报 , 2009, DOI: 10.11834/jig.20091022
Abstract: 目前多模医学图像配准都定位在两幅图像配准的研究,很少涉及N维(3维及3维以上)图像的配准。当用扩展的N维互信息测度(E-NMIM)进行多个图像配准时,不能保证互信息(MI)值的非负性,并且运算速度慢,达不到临床要求。本文提出一种新的N维互信息测度(N-NMIM),不仅保证了MI值的非负性,而且在[1,2]有界范围内,也提高了配准的速度。通过腰椎部位的CT,T1加权的MRI和T2加权的MRI图像进行实验,验证了这种配准方法的有效性。
等效原理算法在不同等效面下的误差分析
Error analysis of equivalence principle algorithm on different equivalence surfaces

党训旺,李懋坤,杨帆,许慎
- , 2015, DOI: 10.13700/j.bh.1001-5965.2015.0214
Abstract: 摘要 等效原理算法(EPA)借鉴了区域分解的思想,并基于惠更斯等效原理实现了对大规模散射问题的计算.本文对EPA中的等效原理算子(EPO)进行了误差分析,选取了立方体、球体和进行了光滑处理的立方体等作为等效面寻找误差来源,并提出了误差改进的建议.根据计算结果,等效磁流在等效面上描述的误差一般集中在等效面表面的几何不连续处,且主要受等效面上的法向向量不连续性和基函数的选取的影响.故在选取等效面时应尽量考虑使用平滑的等效面,而不是直接使用立方体等效面.
Abstract:Equivalence principle algorithm (EPA) is a domain decomposition algorithm based on the Huygens' equivalence principle to solve large scale scattering problems. The errors of the equivalence principle operator (EPO) in EPA using cubic, spherical and smooth cubic equivalence surfaces were analyzed to find the source of errors. The sources of the error were investigated and a simple scheme to improve its accuracy was developed. From the numerical examples, it shows that the error of equivalent magnetic current is mainly concentrated on geometrical discontinuity of the equivalence surface, and affected by both the discontinuity of the normal vector on the equivalence surface and the choice of basis functions. Therefore it is suggested to choose smooth equivalence surfaces if possible rather than to use cubic ones directly.
复乳液在延展流中流变行为研究
Rheological Behaviors Investigation of Multiple-Emulsion Globules in Extensional Flows

王靖涛,徐根苗,Kelkil E A,许慎
- , 2018, DOI: 10.11784/tdxbz201703098
Abstract: 为了探究复乳液内部子液滴的大小和位置分布对其流变行为的影响, 采用二维波谱边界元素法数值模拟了延展流中同心复乳液和非对称复乳液的流变行为.通过改变子液滴的大小和位置得到复乳液不同的流变行为, 并深入分析其变形和移动机理.研究结果表明:在不同的毛细管数下, 同心复乳液内部子液滴的存在对复乳液的变形有正反双重作用; 双子液滴的不对称分布导致非对称复乳液两侧界面变形和曲率不对称, 界面曲率差驱使母液滴在延展流中发生移动.
In order to explore the impact of inner droplets’ size and position on rheological behaviors of outer droplets,the two-dimensional spectral boundary element method was employed to simulate the rheological behaviors of concentric multiple-emulsion globules and asymmetric multiple-emulsion globules in extensional flows. The different rheological behaviors of multiple-emulsion globules were obtained by changing the size and position of the inner droplets,and the mechanism of deformation and movement was deeply analyzed. The results show that the inner droplet of the concentric multiple-emulsion globules has positive or negative effects on the deformation of the globules under different capillary numbers. The asymmetric layout of the double-emulsion droplets leads to the asymmetric deformation of the globules with different interface curvatures,which causes the oriented shift of the globules
Dissociative ionization of methane by 54 eV electron impact
甲烷分子电子碰撞电离和解离的实验研究

许慎,马新文,任雪光,T. Pflüger,A. Dorn,J. Ullrich
物理学报 , 2011,
Abstract: The dissociative ionization process of methane induced by 54eV electron impact is investigated using an advanced reaction microscope. In the present paper, our attention is specially paid to the kinetic energy distributions of the CH+2,CH+ and C+ fragments. Energy deposition spectra are presented for these fragments of different kinetic energies. It is shown that the dissociations from the (2a1) -1 and (1t2) -2(3a1) states of CH+4 are the dominant contributions of the CH+2, CH+ and C+ fragments. The kinetic energy of fragment is sensitive to the electronic state of its parent ion. Fragment ions with kinetic energies lower than 0.1 eV are mainly from the dissociation of (2a1) -1 state, and partly from the dissociation of (1t2) -2(3a1) state; the ions with energies between 0.1 eV and 0.3 eV are contrituted equally by the two states; the ions with energies higher than 0.4 eV are formed dominantly from the dissociation of (1t2) -2(3a1) state.
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