连续弯道急流的数值模拟

用准二维水流数学模型对桃河阳泉市区段约６ｋｍ长连续弯道中急流的运动进行了数值模拟。计算所得断面垂线平均流速分布合理,纵向水深计算值与实测值之规律及数值相符。     

新疆南天山库车河地区二叠—三叠系界线探讨

新疆南天山库车河地区山着二叠－三叠系的连续剖面，剖面中地层界线清楚，化石较为丰富。在上二叠统比尤勒包谷孜群中发现了安加拉大陆晚二叠世植物群的典型代表“Ｃａｌｌｉｐｔｅｒｉｓ”ｚｅｉｌｌｅｒｉ和俄罗斯库滋涅茨克煤田上二叠统顶部的特有种Ｙａｖｏｓｋｙａ ｍｕｎｇａｔｉｃａ。而下三叠统俄霍布拉克群的植物化石具明显的中生代面貌。因此，库车河地区海西期花岗岩之上覆盖着晚二叠世晚期地层，它与下三叠统俄霍布拉克     

负离子空气净化器主要参量对臭氧浓度的影响

对放电参量和电极结构与臭氧的关系进行了较为系统的实验研究，结果发现电晕电压、电晕电流、负离子浓度、电晕线线经、线长、网状电极网孔尺寸和板间距离均对臭氧浓度有影响。     

饱和状态下水泥浆体的微观结构冰冻损伤模型

为了研究水转化为冰所带来的体积膨胀对水泥浆体的微观结构的危害,量化微观结构的内部损伤,建立了一个饱水状态下水泥浆体的冰冻破坏模型.首先使用模拟水泥浆体微观结构的数值模型(HYMOSTRUC)生成一个模拟结构,根据这个模拟结构中的孔结构,分析水分在孔隙中发生的相转变;将含有冰、水和水化产物的水泥浆体微观模拟结构转变为三维...     

食品安全知识在有机化学教学中的渗透

在有机化学教学中渗透食品安全知识,使食品安全知识与有机化学教学有机结合,提高学生学习兴趣,增强学生的食品安全意识．     

Implementation of an efficient segregated algorithm-IDEAL on 3D collocated grid system

The segregated algorithm-IDEAL (inner doubly-iterative efficient algorithm for linked-equations) is an efficient and stable algorithm. In this algorithm, there exist inner doubly-iterative processes for pressure equation, which almost completely overcome two approximations in SIMPLE algorithm. Thus the coupling between velocity and pressure is fully guaranteed, greatly enhancing the convergence rate and stability of iteration process. In this paper, implementation of the IDEAL algorithm on a 3D collocated grid system is conducted. The interface velocity is calculated by the modified momentum interpolation method (MMIM), by which the converged result is independent of the under-relaxation factor. Finally, five three-dimensional incompressible fluid flow and heat transfer problems are provided to compare the convergence rate and robustness between the IDEAL and three other most widely-used algorithms (SIMPLER, SIMPLEC and PISO). By the comparison it can be concluded that the IDEAL algorithm is more robust and efficient than the three other algorithms. Supported by the Key Project of National Natural Science Foundation of China (Grant No. 50636050), Fundamental Projects of Research and Development in China (973) (Grant Nos. 2006CB601203 and 2007CB206902)     

Osmium isotope determination on mantle-derived peridotite xenoliths from Panshishan with N-TIMS

The¹⁸⁷Os/¹⁸⁸Os ratios of spinel lherzolite xenoliths from Panshishan determined with N-TIMS are lower than that of the primitive mantle, which shows depleted mantle characteristics. Their positive correlation with Al₂O₃/MgO suggests that the geochemical behavior of trace elements Re and Os is similar to that of Al₂O₃ and MgO respectively during the magmatic evolution and Re-Os isotopic system is largely immune to mantle metasomatism. A model age of 2.8–3.4 Ga obtained by¹⁸⁷Os/¹⁸⁸Os-Al₂O₃/ MgO correlation might represent the homogeneous age of the mantle lithosphere beneath the area.     

基于思维进化的机器学习:框架及新进展

综述了MEBML产生的基础、动机以及它的基本原理、特点和新的进展.并指出:MEBML有快速学习的能力,适应性好,学习灵活,可应于黑盒子系统和灰色系统,具有固有的并行性以及解决非数值问题的能力.     

建筑能耗软件协同开发及可靠性技术方法

建筑全性能模拟软件具有功能模块繁多、模块结构各异、独立性强等特征,面对其软件开发的多团队协同、多模块集成、可靠准确验证等需求,本文提出了建筑能耗模拟软件协同开发管理体系,采用GitLab平台进行代码管理、及其协同开发与集成,同时给出了软件可靠性在线检测工具,以及ASHRAE-140标准的软件准确性检验方法,建立了一套多家协同、科学可靠、准确高效的协同开发管理体系,实现了建筑全性能仿真平台内核的开发研制。     

改进TM法控制贴体网格节点分布的研究

在分析微分方程法控制网格节点分布方法的基础上，对改进的ＴＭ法控制网格生成进行研究，并以柴油机ＭＰＣ排气管分支为例，用改进的ＴＭ法生成二维贴体网格．应用实例表明，增加角度控制参数后，该方法能对复杂区域生成合理的贴体网格