论街区文化及其基本精神——以北京市崇文区东花市街区为例

街区文化是具有历史文化街区因素的以街道办事处为事务中心的包括有若干相对自治性社区的城市某一范围内全体居民共同创造的文化。北京市崇文区东花市街区有独特而悠久的文化,有深厚的爱国主义和民族精神,它所确立的街区文化及其基本精神,对于城市街区精神文明建设有启发意义。     

Polychlorinated dibenzo-p-dioxins and dibenzofurans in flue gas emissions from municipal solid waste incinerators in China

Polychlorinated dibenzo-p-dioxins and furans （PCDD/Fs） emissions in flue gas from two types of municipal solid waste incinerators （MSWIs） most commonly used in China were investigated in this study. The selected incinerators include two grate-type MSWIs： MSWI-A （350 t/d） and MSWI-B 050 t/d）, and two fluidized bed MSWIs： MSWI-C （400 t/d） and MSWI-D （400 t/d）, which are all equipped with semi-dry lime scrubber and bag filter except MSWI-D equipped with cyclone and wet scrubber （WS） as air pollutant control device （APCD）. Results indicated that the emission concentration and the international toxic equivalents （I-TEQs） of the PCDD/Fs from the stacks were in the range of 1.210-10.273 ng/Nm^3 and 0.019-0.201 ng I-TEQ/Nm^3, respectively. They were greatly lower than the emission regulation standard of PCDD/Fs in China （1.0 ng I-TEQ/Nm^3）. However, only the PCDD/Fs emission level from MSWI-C was below 0.1 ng I-TEQ/Nm^3. Although the homologue profiles were distinct, the contributions of the 2,3,7,8-subsituted congeners to the total I-TEQ were similar among all the investigated MSWIs. Two major 2,3,7,8-substituted congeners, 2,3,4,7,8-PeCDF and 1,2,3,7,8-PeCDD, account for 47% and 9% （average values） of the total I-TEQ values, respectively. The correlation between PCDD/Fs levels and composition of flue gas was also discussed.     

地铁车车体结构性能仿真分析

为判断某型地铁客车车体结构设计的合理性,以车辆车体结构为研究对象,在Hypermesh软件中建立其有限元模型,根据EN 12663和GB/T 7928标准对其施加工况载荷,利用ANSYS软件对车体的静强度、刚度、模态和疲劳强度进行了有限元仿真分析.计算结果表明:车体在各工况条件下的刚度、静强度、模态和疲劳强度均满足设计要求,进而验证了车体结构设计的合理性,同时也为后续车体结构的改进和优化提供理论支撑.     

语重心长话职教

在"中国职业技术教育学会第三届会员代表大会"上,本刊记者独家采访了原国家教委党组书记、中国职业技术教育学会名誉会长何东昌。     

IRM--"企业再造"之物质基础

"企业再造"是90年代一场新的管理革命.笔者认为这场革命的物质基础是信息资源管理(IRM),本文从IRM打破了传统的工业经济的组织分工理论、传统的企业市场经营环境、旧的企业运营规则三方面入手分析了其原因,并提出了对我国企业的启示.     

高校学生权益的内涵、类型、结构及其法律特征

本文通过分析高等学校学生权益的内涵、分类、结构 ,阐明高等学校学生权益的规则性、专属性和法定性的法律特征 ,探讨高等学校依法治校 ,实现学生合法权益 ,保护学生合法权益的法律途径     

Influence of coherent structures in the gas-particle circular cylinder wake flow

INTRODUCTION Turbulent gas-particle flows are frequently found in natural phenomena and industrial processes.Cases of cylinders in cross flows with particles occur in heat exchange equipment,including the convective zone of a fluidized-bed combustor,and in the primary superheaters,reheaters,and economizers of coal-fired boilers.Coherent structures often occur in the above-mentioned gas-particle flow,and have great effect on such different systems,while some features of tur-bulent multiphas…     

Effects of medium composition on the production of plasmid DNA vector potentially for human gene therapy

INTRODUCTION The difficulties associated with large-scaleproduction of biotherapeutics provide a constantchallenge to the biotechnology industry. FDA hadadded “therapeutic DNA plasmid vectors” to the listof well-characterized biotechnology product (DoHHs,1996), and gene therapy has moved rapidly fromlaboratory scale to clinical trials. It is urgent to de-velop new protocols to obtain high-quality plasmidswith high yields and minimal or no contamination ofRNA and chromosomal D…     

试论当前我国社区教育的改革和发展

社区教育的改革和创新是我国社会进步和教育发展的必然要求,因此,应该更新社区教育的理念、加强社区教育的政策保障、探索社区教育实施途径、提高社区教育的质量效益,使当前我国社区教育得以健康、快速发展。