新疆建材家居企业亮相“乌洽会”

中国乌鲁木齐对外经济贸易洽谈会(简称乌洽会),是1992年经国家商务部批准,每年定期举办的中国西北部规模最大的综合性国际展览洽谈会。乌洽会对加快新疆优势资源转换步伐,扩大经贸交流合作,树立对外开放的良好形象,优化投资环境,推动西部大开发战略的实施和新兴国际商贸中心的建设,起到了积极的促进作用。目前,乌洽会已成为我国西部最大的综合性国际经贸盛会,成为沟通世界各国经贸往来的重要窗口和桥梁,成为充分展示新疆经济发展、社会稳定的重要平台。随着经济全球化进程的加快和区域合作经济的快速发展,新疆与中亚及周边国家的经贸合作面…     

贵州省乳螱属一新种(等翅目:鼻螱科)

贵州乳螱Coptotermes(Polycriniterms)guizhoueusis,新种兵螱(图1—3) 头部深黄稍杂浅淡褐色,上颚赤褐色,上唇、触角和后颏以及胸、腹部和足为深黄色,或略浅于头色。头部仅散布少许长毛,上唇端部具一对长端毛,端毛周围可见数个极微小的毛。乳孔口两侧各具二枚毛,乳孔与触角窝之间各具一枚额侧毛。后颏前缘和     

Study on two operating conditions of a full-scale oxidation ditch for optimization of energy consumption and effluent quality by using CFD model

The operating condition of an oxidation ditch (OD) has significant impact on energy consumption and effluent quality of wastewater treatment plants (WWTPs). An experimentally validated numerical tool, based on computational fluid dynamics (CFD) model, was proposed to optimize the operating condition by considering two important factors: flow field and dissolved oxygen (DO) concentration profiles. The model is capable of predicting flow pattern and oxygen mass transfer characteristics in ODs equipped with surface aerators and submerged impellers. Performance demonstration and comparison of two operating conditions (existing and improved) were carried out in two full-scale Carrousel ODs at the Ping Dingshan WWTP in Henan, China. A moving wall model and a fan model were designed to simulate surface aerators and submerged impellers, respectively. Oxygen mass transfer in the ditch was predicted by using a unit analysis method. In aeration zones, the mass inlets representing the surface aerators were set as one source of DO. In the whole straight channel, the oxygen consumption was modeled by using modified BOD-DO model. The following results were obtained: (1) the CFD model characterized flow pattern and DO concentration profiles in the full-scale OD. The predicted flow field values were within 1.98 ± 4.28% difference from the actual measured values while the predicted DO concentration values were within −4.71 ± 4.15% of the measured ones, (2) a surface aerator should be relocated to around 15 m from the curve bend entrance to reduce energy loss caused by fierce collisions at the wall of the curve bend, and (3) DO concentration gradients in the OD under the improved operating condition were more favorable for occurrence of simultaneous nitrification and denitrification (SND).     

农业企业化是加速农村城镇化的必由之路——以广西省兴业县为例

一、农业企业化的发展带动城镇化发展,是社会经济发展的基本特征 农业企业向城镇相对集中进行发展:一是有利于提高土地利用效益和生态效益,提高公共设施的利用率,节省投入;二是有利于沟通经济信息避免重复建设,促进生产力的进一步发展。农民逐步进城镇务工经商,生产     

弹道计算中正常重力的计算方法分析

针对弹道计算中正常重力的计算问题,分析了两种正常重力计算方法的特点,认为拉普拉斯方法的缺点是大地水准面形状确定困难而斯托克斯方法缺少地球表面外空间的正常重力算法.根据斯托克斯方法所定义的正常重力模型,将索米里安公式推广到地球表面的外空间,从而得到了一种正常重力的精确算法.通过计算对比这两种重力计算方法的差异,得出在使用拉普拉斯方法计算正常重力并取合适的球谐级数项时,可直接采用正常地球椭球面作为大地水准面,不会对弹道计算造成大的计算误差.     

镁铝比对高炉低铝渣系流动性能及热稳定性影响规律

以本钢现场高炉渣成分为基础,结合粘度测定实验和热力学分析计算,研究了不同镁铝比对高炉低铝渣流动性的影响规律,计算了镁铝比对低铝渣系粘流活化能的影响,同时结合红外光谱分析,从微观结构层面阐述了镁铝比对低铝渣热稳定性的影响机理.结果表明,炉渣粘度及熔化性温度均因镁铝比的提升表现出逐渐走低的趋势,而低铝渣的温度稳定性则因炉渣中复杂结构的解聚而愈趋稳定.     

数据融合技术在变压器状态评估中的应用

电力变压器是电力系统及变电站的最至关重要的设备之一。对电力系统进行运行维护时,监测并预报变压器运行状态并且能够有效地监测并判断变压器的故障情况具有非常现实的意义。基于设备状态信息融合技术,分析了D-S证据理论的基本原理、组合规则和决策过程。通过具体的实例论述了诊断方法的具体可行性,比较了单一诊断方法(只经神经网络判断的结果)与信息融合技术的正确率,并指出信息融合技术的发展优势和可实现性。     

Locating architecture,post-colonialism and culture: contextualisation in Algiers

Through discussion of the case of Algiers, this paper exposes the forces by which architecture as a system of meanings and experiences is affected by a broader network of meaning. It examines how the built environment can contribute to the preservation of cultural values, and can also act as a physical instrument of cultural change. The study of the way that the built environment was produced in Algiers under Ottoman rule (fifteenth – nineteenth centuries), and the subsequent transformations that occurred under French colonialism (nineteenth – twentieth centuries), along with the cultural implications of each period, reveals that the extent to which architecture and culture relate to/affect each other depends on the broader political, economic and social context.     

“城中村”改造的创新思维——以益阳高新区“城中村”改造为例

在城市化进程中,城市建设急剧扩张与城市管理体制改革相对滞后造成了“城中村”的特殊现象。本文以益阳高新区为例,对益阳高新区“城中村”改造所面临问题进行了全面地研究,结合益阳市“城中村”改造政策以及高新区开发建设特点和现状情况,提出了益阳市高新区“城中村”改造的新思路。