A 3D numerical simulation of laser-induced incandescence of soot particles in coal combustion products   总被引：1，自引：0，他引：1  

Gérard GREHAN 《浙江大学学报(A卷英文版)》2009,10(9):1320-1326

Laser-induced incandescence （LII） has received increasing attention as a potentially powerful technique for in-situ measuring of the volume fraction and primary size of soot particles in combustion systems. In this study, a 3D Monte Carlo simulation combined with a Mie equation was developed to analyze the influence of spectral absorption and scattering on the measured LII flux emitted by soot particles. This paper represents a first attempt to analyze soot measurement using the LII technique in coal combustion products. The combustion products of gases （CO2, N2）, soot, and fly-ash particles, present between the location of laser-excited soot and the LII flux receiver. The simulation results indicated that an almost Beer-Lambert exponential decrease in LII flux occurred with an increase in the volume fraction of soot particles, while a nearly linear decrease occurred with an increase in the volume fraction of fly-ash particles. The results also showed that scattering effects of both soot and fly-ash particles on the LII flux could be neglected. Compared with the absorption of gases, a decrease of 20% of LII flux was observed with soot particles, and a decrease of 10% with fly-ash particles.  相似文献   

对莆田滨海体育休闲旅游开发的认识与思考   总被引：1，自引：0，他引：1  

陈空清  刘永祥 《黄山学院学报》2009,11(3):89-92

通过调查分析莆田滨海体育休闲旅游的资源状况以及开发与发展具有的优势和特色,探讨滨海体育休闲旅游产品的概念与特征,从实现莆田滨海体育休闲旅游可持续开发和促进旅游经济发展的战略高度,对莆田滨海体育休闲旅游开发的总体目标和市场定位以及莆田滨海体育休闲旅游产品开发的基本思路、可持续开发与发展的对策进行初步的研究,提出了建设性的创意和建议.  相似文献   

广东、江苏上市公司盈利能力比较     

岑成德 《广东轻工职业技术学院学报》2002,1(2):5-9

对广东省与江苏省的上市公司的盈利能力进行了统计比较分析，并用相关分析等方法对盈利能力与公司规模、成长性和现金流量间的关系进行了探索。文章结合实际问题的分析讨论了统计分析的一些方法问题。  相似文献   

翻译——帝国统治的共谋     

聂咏华 《丽水学院学报》2007,29(6):26-29

与传统的翻译研究不同,后殖民主义的翻译研究重视语言之间的不平等地位,认为翻译不是一种单纯的个人行为,翻译的过程受到双方语言政治文化等诸多因素的影响.全文从后殖民的角度探讨翻译的产生和发展与帝国的需要、政治权力斗争之间的关系,从而揭示翻译在帝国统治下所扮演的角色.  相似文献   

Pressure drop in a packed bed with sintered ore particles as applied to sinter coolers with a novel vertically arranged design for waste heat recovery     

Fu-you Tian  Lian-feng Huang  Li-wu Fan  Hong-liang Qian  Jia-xi Gu  Zi-tao Yu  Ya-cai Hu  Jian Ge  Ke-fa Cen 《浙江大学学报(A卷英文版)》2016,17(2):89-100

The pressure drop over a packed bed with sintered ore particles was studied experimentally. The sintered ore particles were characterized to determine their equivalent particle diameter, bed voidage, and sphericity. The pressure drop experiments were performed on unsorted and sieved particles with various size distributions for a superficial velocity up to 2.4 m/s, covering flow regimes from laminar to turbulent. It was shown that the Ergun equation underestimates the pressure drop for such highly irregular-shaped particles by about 40%. The measured modified friction factor was well correlated to a scaled Ergun equation, which was verified to be valid for the modified particle Reynolds number up to 12 000 toward design and optimization of vertically arranged sinter coolers for waste heat recovery.  相似文献   

车辆工程专业应用型本科生实践能力培养研究     

李永华  陈秉智  石姗姗  宫琦 《安阳工学院学报》2019,18(2):106-109

车辆工程专业本科生通过理论学习、专业实验、生产实习和毕业论文等实践环节,使学生具备从事轨道车辆设计、制造、检修、运用等方面的能力。但是,目前重理论,轻应用的现状不符合当下培养应用型本科生的目标。将车辆工程专业本科生的实践能力分为5个一级指标和15个二级指标,利用模糊综合评判方法对其进行综合评价,计算出学生的实践能力综合评价值。在此基础上,找到影响本科生实践能力的主要因素,给出更加合理的改进意见,进一步提高学生的综合实践能力。  相似文献   

Large eddy simulation of the gas-particle turbulent wake flow     

罗坤  金晗辉  樊建人  岑可法 《浙江大学学报(A卷英文版)》2004,5(1):106-110

To find out the detailed characteristics of the coherent structures and associated particle dispersion in free shear flow, large eddy simulation method was adopted to investigate a two-dimensional particle-laden wake flow. The well-known Sub-grid Scale mode introduced by Smagorinsky was employed to simulate the gas flow field and Lagrangian approach was used to trace the particles. The results showed that the typical large-scale vortex structures exhibit a stable counter rotating arrangement of opposite sign, and alternately form from the near wall region, shed and move towards the downstream positions of the wake with the development of the flow. For particle dispersion, the Stokes number of particles is a key parameter. At the Stokes numbers of 1.4 and 3.8 the particles concentrate highly in the outer boundary regions. While the particles congregate densely in the vortex core regions at the Stokes number of 0.15, and the particles at Stokes number of 15 assemble in the vortex braid regions and the rib regions between the adjoining vortex structures.  相似文献   

网民集体行动的动力机制探析——以“郭美美事件”为研究个案     

郝永华  芦何秋 《国际新闻界》2012,(3):61-66

利用数据挖掘软件,本研究获得"郭美美事件"初期新浪微博中转发量超过300次的239条微博样本,通过分析,发现网民集体行动的主要动力是:腐败框架、愤怒的培养和威胁感知。在框架竞争中,腐败框架成为主导性的问题定义框架,并设定了人肉搜索"提出框架-证明框架"的模式。腐败框架"标注"出问题的严重性和不公正性,激发了网民的愤怒。在事件进程中,网民的愤怒得到培养并具有娱乐化倾向。在相对自由的网络空间,任何形式的威胁感知都可能激起网民的对抗性反应,并成为集体行动的动力。  相似文献   

浙江省基础研究20年投入产出情况分析     

吕宏芬  俞涔 《科技管理研究》2009,29(8)

基础研究是自主创新的源头,也是培育创新人才的摇篮.一个国家或地区基础研究的水平在一定程度上反映了该国或地区的持续竞争能力.从投入产出角度,对浙江省基础研究20年来所投入的人力、财力以及相应的论文、专利等产出进行了系统分析,指出基础研究对于区域创新能力的作用,同时也指明了浙江基础研究所存在的问题.  相似文献   

一种基于多重哈希词典和K-最短路径算法的中文粗分词方案研究   总被引：1，自引：1，他引：0  

岑咏华 《情报理论与实践》2009,32(3)

本文在已有研究基础上,针对中文粗分词,设计了多重哈希词典结构,以提高分词的词典匹配效率,同时基于删除算法改进了中科院ICTCLAS分词系统的K-最短路径搜索思想.最后,论文对所研究技术方案进行了系统实现.系统实验结果表明,对于大规模文本,论文所提出的粗分词方案体现出了很好的性能.  相似文献