微通道中甲醇蒸汽重整反应过程的LBM模拟

采用格子-Boltzmann方法对平行平板间甲醇水蒸气重整反应过程进行模拟,其中包括反应、对流、扩散。模拟中假设化学反应对流场没有影响,流场、温度场和组分场可分别利用演化方程进行求解,利用多尺度技术可分别将演化方程回归到对应的宏观方程。在低Ma的条件下格子-Boltzmann方法模拟的结果与传统Navier-Stokes方程数值计算结果进行对比,吻合得较好,证明了格子-Boltzmann方法的可靠性。     

图的L(d,1)-标号的边跨度

对于给定图G顶点集上一个非负整数函数f,满足:若dG(u,v)＝1,f(u)-f(v)≥d;若 dG(u,v)＝2,f(u)-f(v)≥1.称f 为L(2,1)-标号.这是由频道分配问题抽象出来的数学模型.本文主要研究该标号问题的一个参数,即边跨度,记作βd(G)＝minf max{f(u)-f(v):u∈V(G)},即对于所有正常的L(d,1)-标号,使得相邻顶点标号之差的最大值达到最小.本文主要讨论了圈Cn、树T、 k-部完全图、正三角形网格、 正四边形网格以及弦图等图类的边跨度,并给出了确切的数值.     

Properties of vortex system with random columnar defects at zero temperature

The properties of a two-dimensional vortex system with random columnar defects were studied by cooling the vortex system to zero temperature. The vortex lattice became more and more disordered with increasing pinning strengthf _p. At smallf _p, a triangular vortex, lattice away from the pins was observed. The peak of structure factorS(G₀) of the vortex lattice decreased with pinning strengthf _p, which accorded with the finding that the probability of vortex to be pinned increased withf _p. Some of our results agreed with experimental findings. Project supported by the Ministry of Science and Technology of China (NKBRSF-G19990646) and Zhejiang Province Scientific Foundation (199031).     

格构锚杆边坡支护优化设计及计算方法研究

结合实际工程案例研究了格构锚杆边坡支护优化设计的方法和步骤,使用条分法计算了边坡加固前后的安全系数,并提出了采用安全系数控制的格构锚杆边坡支护的优化设计方法,建立了一套针对格构锚杆边坡支护优化设计的设计体系。     

格拓扑空间

本文将集合论中的拓扑概念引入到完全分配格上,定义了格拓扑空间、拓扑基、邻元系等概念,给出了邻元系,拓扑基的刻画,讨论了它们的关系,得到若干结果,从格论的角度深化了拓扑的理论。     

子Quantic格

研究了Quantic格的内部结构,给出了子Quantic格和余核映射的定义,讨论了余核映射和子Quantic格之间的关系以及子Quantic格的若干性质．     

自由可换格群的阿基米德性质

S.J．Berun曾给出了在一个半序群上的自由可换格群是阿基米德的充要条件．但是他的证明中含有一个错误．我们将改进Bernau的结果,用简单的方法给出另一个充要条件．同时我们还给出了如何判别一个格群是阿基米德的充分条件．     

聚合物链三级相互作用排斥体积计算方法

基于三级相互作用的旋转异构态模型,建立了在金刚石格点上计算排斥体积的蒙特卡洛方法。然后按此方法计算了聚甲撑链的排斥体积效应。     

Direct and green repairing of degraded LiCoO2 for reuse in lithium-ion batteries

Traditional recycling processes of LiCoO₂ rely on destructive decomposition, requiring high-temperature roasting or acid leaching to extract valuable Li and Co, which have significant environmental and economic concerns. Herein, a direct repairing method for degraded LiCoO₂ using a LiCl–CH₄N₂O deep eutectic solvent (DES) was established. The DES is not used to dissolve LiCoO₂ but directly serves as a carrier for the selective replenishment of lithium and cobalt. Replenishment of lithium restores LiCoO₂ at different states of charge to a capacity of 130 mAh/g (at 0.1 C rate), while replenishing the cobalt increases the capacity retention rate of 90% after 100 cycles, which is comparable to pristine LiCoO₂. The DES is collected and reused multiple times with a high repair efficiency. This process reduces energy consumption by 37.1% and greenhouse gas emissions by 34.8% compared with the current production process of LiCoO₂, demonstrating excellent environmental and economic viability.     

基于知识网格的高校图书馆知识服务探索

文章介绍了知识网格的概念及研究的核心问题。着重论述了知识网格在高校图书馆知识服务中的重要作用以及高校图书馆实现知识服务所必须解决的技术问题。