海西早期岩溶改造作用及古地貌恢复-以塔河2区为例

塔河油田2区奥陶系储层为一间房组碳酸盐岩礁滩相地层,结合储层岩芯、岩石薄片、测井分析及地球化学特征,进行了构造-沉积特征研究,通过井震结合,应用填平补齐法,恢复了该区及周缘奥陶系顶面海西早期岩溶古地貌,并划分为4个亚地貌单元,分析了奥陶系储层特征及成岩作用,研究了储层岩溶作用期次,得出海西早期的溶蚀-岩溶-构造破裂是储层改造的主要作用机制;通过现今钻井缝洞单元分布,结合海西早期岩溶古地貌、古水系及断裂控制,提出储层发育的有利区带,得出环T443、TK220、T207井附近泄水洼凼北部区域是岩溶储层发育最有利区域。     

世界城市研究的理论发展与转型

随着全球化的日益深入,作为国际城市高端形态的世界城市是近年来学术研究的热点,形成一系列丰富的理论成果。然而,在2008年金融危机之后,既有的以金融资本为核心的世界城市发展模式遭遇困境,世界城市的发展与相应研究也出现转型倾向。本文的研究正是基于以上背景,在梳理世界城市主要观点的基础上,着重从全球价值链视角对传统世界城市研究进行了理论反思,并提出创新正在成为塑造世界城市新维度的观点。     

金川矿区龙首矿长距离独头掘进通风系统改造研究

为制定适合于长距离独头掘进巷道的通风方案,提高长距离掘进的供风效能,以龙首矿西一采区辅助斜坡道为实验基础,通过对原有通风系统进行测试并分析存在的问题,设计钻孔通风方案及风库中转优化布置方案。结果表明：钻孔通风采用2×37 KW的风机配备刚性风筒能使工作面平均风速提高至0.29 m/s以上,该套掘进通风系统调整方案共需投资约11.63万元。风库中转通风系统采用2×11 KW的风机,当风库转移至距离硐口约249 m处,风库中转效率达到最高,单趟风筒工作面风量能够达到1.11 m3/s,采用双趟风筒时工作面风量能够达到2.22 m3/s。方案实施后,与预期的通风效果基本相符。     

南钢制氧厂水循环水泵节能改造实践

简要介绍南钢制氧厂水循环水泵运行状况,详细描述了水泵节能改造的技术方案和实施情况,取得明显经济效益,总结了一些经验。     

Kriging和距离因子辅助的全局优化方法

基于Kriging元模型的优化方法通常存在优化效率较低、收敛速度较慢、昂贵估值次数较多且难以有效平衡Kriging模型的局部与全局搜索行为等弊端。为此,提出一种序列Kriging和距离因子辅助的全局优化方法。其实现过程主要包含两个阶段:一是利用Kriging模型近似复杂昂贵的黑箱函数;二是利用Kriging模型与距离因子的乘积构造加点采样法则,并通过免于求导的DIRECT算法优化该法则,以获取新的昂贵估值点。六个数值函数测试和一个摆线泵仿真实例验证所提出方法的有效性。     

基于BIM技术的输变电三维数字化模拟仿真分析

本文研究一种基于BIM技术的输变电三维数字化模拟仿真系统。基于系统运行调度BIM系统的需求,通过将输电系统设计、建设过程的BIM系统直接进行开发,且综合调用LINUX系统下的BIM、CAM、Java、MySQL、Python、php、H5等开发工具,实现以小波分析和傅里叶分析为前期数据治理过程,以模糊神经元网络为核心数据仿真分析过程的输变电三维仿真系统。通过对该系统进行运行分析,发现:一方面可以生成更贴近真实条件的波形数据,一方面可以对故障仿真实现与理论推算100%相符的仿真结果和对运行仿真与理论推算90%以上相符的仿真结果。该系统将有效提升智能输电的智能化水平,对输电工程的智慧化过程有积极意义。     

Formation of Oxamic Acid During Drinking Water Treatment

Although oxamic acid has been identified as an ozone oxidation product from several precursor compounds, concentrations for drinking water have not been published previously. This study shows results from a full-scale drinking water treatment plant, noting that the mean concentrations for oxamic acid reached 21.3 μg/L after ozonation and prior to filtration. Subsequent multiple-layer filtration removed 85% of oxamic acid on average, and mean concentrations in drinking water were 2 μg/L. Up to 5.9% of the oxamic acid found in ozone-treated groundwater may be formed from Chloridazon metabolites.     

浅析有限资金下旧厂房改造的生态策略——以内蒙古工业大学旧厂房改造为例

本文浅析在有限资金下旧厂房改造的若干生态策略，重点分析如何使旧厂房的空间、设备、材料等得以再生。改造节省了大量的资金，同时使旧厂房的历史记忆得以延续。     

Application of interrupted cooling experiments to study the mechanism of bainitic ferrite formation in steels

New interrupted cooling experiments have been designed to study the kinetics of bainitic ferrite formation starting from a mixture of austenite and bainitic ferrite. It is found that the kinetics of bainitic ferrite formation during the cooling stage is determined by the isothermal holding time. The formation rate of bainitic ferrite at the beginning of the cooling decreases with increasing prior isothermal holding time. An unexpected stagnant stage during the cooling stage appears when the isothermal holding time increases to a critical point. There are two reasons for the occurrence of the stagnant stage: (i) a solute spike in front of the interface; and (ii) kinetic transition. A so-called Gibbs energy balance approach, in which the dissipation of Gibbs energy due to diffusion inside the interface and interface friction is assumed to be equal to the available chemical driving force, is applied to theoretically explain the stagnant stage. A kinetics transition from a fast growth mode without diffusion of Mn and Si inside the austenite–bainitic ferrite interfaces to a slow growth mode with diffusion inside the interface is predicted. The stagnant stage is caused by the transition to a slow growth mode. The Gibbs energy balance approach describes the experimental observations very well.     

DESCRIPTION OF A THERMO-INELASTIC BODY WITH A MOVING SOLID/LIQUID INTERFACE AND SIMULATION OF THE WELDING PROCESS

Conservation laws of mass, momentum, and energy for the thermo-inelastic body in the region involving the moving interface between the solid and liquid are introduced to derive jump conditions of velocity, stress, and energy on the interface as the sequence of local form for the generalized Reynolds transport theorem. The jump condition of energy is revealed to be the generalized Stefan condition for moving interface problems. The finite element formulation is used to analyze the modes of flow, deformation, and stresses in a melting or solidifying process by employing a viscoplastic constitutive equation that describes the mechanical behavior of both the solid and liquid phases. The mathematical formalism is applied to simulate bead-on plate welding.