排序方式: 共有54条查询结果,搜索用时 15 毫秒
1.
《Journal of Saudi Chemical Society》2023,27(3):101645
To study the desorption mechanism of methane in coal by H2O injection and establish the Wiser molecular structure model of bituminous coal, the Grand Canonical Monte Carlo method was used to study the desorption behavior of CH4 in coal with different amounts of H2O injection at molecular scale. The results showed that at 293 K, the maximum adsorption capacity of H2O was about 16 mmol/g, and that of CH4 was about 8 mmol/g, which was about twice that of CH4. This indicates that H2O has a stronger adsorption capacity than CH4. For methane-bearing coal, when the amount of water injected is 100, the average relative concentration of CH4 is 0.5446, and the average relative concentration of CH4 decreases by 33.77% compared to the water content of 20. Under the same time conditions, the root mean square displacement and diffusion coefficient of CH4 decrease with the increase of H2O injection quantity. With the increase of H2O injection, the motion velocity of CH4 in vacuum layer decreased. When water was injected, methane was trapped in the coal by water. The more H2O injected, the more methane trapped in the coal, and the less methane desorption. This research lays a theoretical foundation for further research involving coal-water interaction. 相似文献
2.
Gao Mingming Wang Jinling Fang Shaojun Nan Jingchang Daming Li 《International Journal of Theoretical Physics》2021,60(7):2358-2367
International Journal of Theoretical Physics - Quantum-dot is the result of elastic relaxation which has a straight relationship with the optical and electronic aspects of the quantum-dot-based... 相似文献
3.
借助高速摄影和图像分析技术对首次发现的附壁气泡的绕圈现象进行了实验研究,重点研究游移气泡的运动轨迹、附壁气泡的布阵过程、气泡的来源以及气泡的振动细节.研究发现游移绕圈气泡的运动轨迹呈现出不稳定、不规则、不光滑的特点.阵列气泡源于游移气泡,而游移气泡变成阵列气泡的方式主要是通过合并增大体积,从而减小所受的Bjerknes力,降低活性的方式实现的.游移气泡源于ALF(acoustic lichtenberg figure)空化云中大量空泡的合并,使以径向振动为主的空泡逐渐过渡到以表面波动为主的气泡.阵列气泡在Bjerknes力的作用下呈现出规则的表面波动,而体积更小受力更大的游移空泡的表面完全失稳,呈现极不规则的形貌,并对附近阵列气泡的表面波动产生影响.阵列气泡呈现出十分规则的排布,相邻阵列气泡之间的振动相位是相反的,表现为相互排斥. 相似文献
4.
在单参数模糊微分方程基础上研究了一阶多参数模糊微分方程和模糊初值问题,利用刻画方程的解与刻画参数的关系给出了多参数模糊微分方程解存在的条件,最后给出了具体算例.表明,多参数模糊微分方程具有广泛的工程应用背景. 相似文献
5.
一阶线性模糊微分方程的解 总被引:4,自引:0,他引:4
利用文[8]中的扩展原理求解了一阶线性模糊微分方程,给出了解可表示的条件,讨论了同其他求解方法之间的关系,最后给出了具体算例。 相似文献
6.
Yongle Wu Yuanan Liu Shulan Li Jingchang Nan 《International Journal of Infrared and Millimeter Waves》2008,29(12):1146-1155
The rigorous analytical solutions and the ABCD matrix of the lossy Cosine-Squared tapered nonuniform transmission lines (CSTNTL)
are presented in this paper. According to different boundary conditions, the unique solution is obtained mathematically. Through
the numerical calculations based on analytical solutions, the distributed voltages and currents in different terminated cases
are shown to explain the transmission characteristics of CSTNTL. Especially in the lossy case the distributed power values
are simulated to show the attenuation phenomenon. 相似文献
7.
本文采用渐变沟道近似和准二维分析的方法, 通过求解泊松方程, 建立了应变Si NMOSFET阈值电压集约物理模型. 模型同时研究了短沟道, 窄沟道, 非均匀掺杂, 漏致势垒降低等物理效应对阈值电压的影响. 采用参数提取软件提取了阈值电压相关参数, 通过将模型的计算结果和实验结果进行对比分析, 验证了本文提出的模型的正确性. 该模型为应变Si超大规模集成电路的分析和设计提供了重要的参考.
关键词:
应变Si NMOSFET
阈值电压
集约物理模型 相似文献
8.
王磊 《数学的实践与认识》2012,42(10):168-173
研究了n阶线性模糊微分方程的模糊初值问题,将n阶线性模糊微分方程转化成一阶线性模糊微分方程组,利用结构元方法将模糊线性微分方程组转化成两个分明的线性微分方程组,通过分明的线性微分方程组的解构造出原n阶线性模糊微分方程的解.最后,给出了具体的算例. 相似文献
9.
针对决策信息为区间Pythagorean模糊数,属性权重不完全确定的多属性决策问题,提出了一种基于相对熵的AQM决策方法。首先,提出区间Pythagorean模糊数的相对熵,计算了各方案与区间Pythagorean模糊正理想方案和负理想方案间的相对熵,据此构建了基于方案相对满意度最大的非线性规划属性权重确定模型;其次,针对每个属性,利用新的区间Pythagorean模糊数得分函数计算方案的0-1优先关系矩阵,依据AQM方法对所有0-1优先关系矩阵进行融合得到合成0-1优先关系矩阵,并确定了方案的综合度,由此获得方案的排序。最后,以软件开发项目的选取为实例说明了该方法的可行性和有效性。 相似文献
10.