Kinetics study on biomass pyrolysis for fuel gas production     

陈冠益  方梦祥  ANDRIES J  骆仲泱  SPLIETHOFF H  岑可法 《浙江大学学报(A卷英文版)》2003,4(4):441-447

Kinetic knowledge is of great importance in achieving good control of the pyrolysis and gasification process and optimising system design. An overall kinetic pyrolysis scheme is therefore addressed here. The kinetic modelling incorporates the following basic steps: the degradation of the virgin biomass materials into primary products (tar, gas and semi-char), the decomposition of primary tar into secondary products and the continuous interaction between primary gas and char. The last step is disregarded completely by models in the literature. Analysis and comparison of predicted results from different kinetic schemes and experimental data on our fixed bed pyrolyser yielded very positive evidence to support our kinetic scheme. Project (No. 2001CB409600) Supported by the National Key Basic Research Program (973) of China  相似文献   

科学认识"两个必然"和"两个决不会"的关系--谈在共产党员先进性教育中怎样进行坚定社会主义信念的教育     

涂金坤 《连云港师范高等专科学校学报》2005,1(3):1-7

资本主义向社会主义发展过渡有"半途夭折"和"寿终正寝"两种形式,现实的社会主义国家都是通过资本主义的"半途夭折"走上社会主义道路的.生产关系赖以存在的生产力的起点和饱和点形成了生产关系的区间,社会主义和资本主义的生产关系区间是前后交错在一起的.在这个交错区内社会现象极其复杂,只有站在历史发展的制高点,用联系的观点和实事求是、与时俱进的态度,对资本主义和社会主义两个方面的发展事实进行理性思考,才能科学认识"两个必然"和"两个决不会"的关系,坚定社会主义的信念.  相似文献   

Kinetics study on biomass pyrolysis for fuel gas production   总被引：1，自引：0，他引：1  

陈冠益  ANDRIES  J.  方梦祥  骆仲泱  SPLIETHOFF  H  岑可法 《Journal of Zhejiang University. Science. B》2003,(4)

INTRODUCTIONSincebiomassisanabundant,inexpensiveandrenewableresource ,itsconversiontosyn theticfuelsandchemicalproductsappearsat tractive.Amongallkindsofbiomassconversionroutes,pyrolysisisbeinggivenincreasingatten tionsincetheprocessissimpleandmaybeopti m…  相似文献   

无公害蔬菜生产技术规程的探讨     

张化远  常虹  董红霞 《商丘职业技术学院学报》2006,5(5):98-100

根据国家绿色食品标准,无公害蔬菜生产必须具备4个基本条件:第一,生产基地无污染;第二,以施用有机肥料为主;第三,合理利用农业栽培措施;第四,禁止使用高毒高残留农药,积极合理使用农业技术、物理、生物手段及生物源农药防治病虫害.  相似文献   

当今时代如何读"经"--生活哲学视野中的"经典"     

徐福来 《华侨大学学报(哲学社会科学版)》2005,1(4):126-130

在当今时代,读“经”是必要的。但何为“经”,“当今时代”有何特点,这些问题要先搞清楚,才能进一步研究如何读经。  相似文献   

Which notion of implication is the right one? From logical considerations to a didactic perspective     

V. Durand-Guerrier 《Educational Studies in Mathematics》2003,53(1):5-34

Implication is at the very heart of mathematical reasoning. As many authors have shown, pupils and students experience serious difficulties in using it in a suitable manner. In this paper, we support the thesis that these difficulties are closely related with the complexity of this notion. In order to study this complexity,we refer to Tarski's semantic truth theory,which contributes to clarifying the different aspects of implication: propositional connective, logically valid conditional, generalized conditional,inference rules. We will show that for this purpose, it is necessary to extend the classical definition of implication as a relation between propositions to a relation between open sentences with at least one free variable. This permits to become aware of the fact that, in some cases, the truth-value of a given mathematical statement is not constrained by the situation, contrary to the common standpoint that, in mathematics, a statement is either true or false. In the present paper, the didactic relevance of this theoretical stance will be illustrated by an analysis of two problematic situations and the presentation of some experimental results from our research on first-year university students' understanding of implication. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

完工产品和在产品的内涵——在产品成本计算中分步法下的讨论     

皇甫亚楠 《商丘职业技术学院学报》2007,6(6):31-32

在不同类型的多步骤加工企业中，采用不同的分步法计算产品成本时，应正确理解完工产品和在产品的内涵。特别是在装配式多步骤加工企业中，平行结转分步法下，对两者内涵的分析尤为重要。  相似文献   

论适度负债经营的企业生产方式     

刘淑君 《石家庄铁路职业技术学院学报》2006,5(2):88-92

企业资金来源，一是所有者的投资，二是负债经营．通过主要分析企业利用负债经营筹措资金的优势，综合由于负债经营对企业治理结构所产生的作用，探讨企业如何利用负债经营这种方式在市场经济中运行，利用最优负债达到资本最优化的企业生产模式．  相似文献   

创造、创新和逻辑     

苑玉成 《唐山师范学院学报》2006,28(6):10-11

创造和创新必须遵守逻辑规律。通常,人们思考问题都是从真前提进而得到真结论,在创造和创新活动中,一般都要经过由假前提寻求真结论的思维过程。  相似文献   

对2004年FIBA篮球规则修改部分的分析与研究     

尹铁军 《零陵学院学报》2005,(3)

为了使篮球比赛更加流畅,国际篮联又一次修改了比赛规则,新修改的篮球竞赛规则已于2004年9月1日起执行。本文就修改后的篮球竞赛规则有哪些新的特点和变化进行分析与研究,将有利于运动员、教练员、裁判员理解规则和执行规则,有助于篮球运动在中国的推广和发展。  相似文献