共查询到19条相似文献，搜索用时 149 毫秒
1.
邱贤德 《重庆大学学报(英文版)》2003,2(1)
1. Introduction In order to study rock damage and fragmentation during blasting, many numerical models have been developed. These efforts have varied from semi-empirical [1,2] to formulations based on shock wave physics [3,4]. Numerical modeling of blasting has been focusing on the complexity of the blasting process. This complexity requires that numerical models be developed in a highly systematic fashion in close coordination with controlled field and laboratory experimentation. This work d… 相似文献
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JU Jian-hua XIA Yi-ben ZHANG Wei-li LU Yu WANG Lin-jun SHI Wei-min School of Material Science Engineering Shanghai University Shanghai China National Lab for Infrared Physics. Shanghai Institute of Technical Physics Chinese Academy of 《上海大学学报(英文版)》2000,(Z1)
l IntroductionDLC film is one of coating materials that has highhardness and good wear-resisbot PrOPerlies. When thefilm is deposited on low haulness substrates with thedifferent YOung's model and expansion coefficient, ahigh stress occurs in the film, which resulted in thedecrement of the adherence of the film and the filmspliting or carking['~4]. In order to improve theadherence of DLC film on the soft subside, the mostcommon method is tO colltrol the iIYIPurities, such as H,St, N and… 相似文献
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程友良 《上海大学学报(英文版)》1999,3(1):84-86
The study of solitary waves has been a subject highly popular and full of interest sinec Russell[1]first observed the solitary waves in a channel and the research on the internal solitary waves in stratified fluids is one of the branches of this subject.There are extensively internal solitary waves in the atmosphere,oceans.fjords and lakes.To study them is of academic and practical significance[2].Numerous investigators have made contributions since the theoretical work on internal solitary waves was initiated by Keulegan[3].Nevertheless,some problems remain still to be discussed,for example,the higher-order theories for one-dimensional internal solitary waves in stratified fluids of small depth,the two-dimensional internal solitary waves,the explanation of the experimental and the practical phenomena by means of theoretical analysis.In this thesis,we hope to gain an insight into the above three items by combining of theoretical analysis and symbolic computation.The following work has been completed. 相似文献
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Influence of Zeotropic Mixtures'''' Temperature Gliding on the Performance of Heat Transfer in Condenser or Evaporator 总被引：1，自引：0，他引：1
Many zeotropic refrigerant mixtures are proposed as alternatives to some chlorofluorocar-bons (CFCs) and hydrochlorofluorocarbons ( HCFCs). An advantage of zeotropic mixtures is the possibility of reduction in entropy generation by matching the temperature glidings of refrigerant and heat-transfer fluid in both condenser and evaporator. Zeotropic mixtures are compared with pure re-frigerants to evaluate their exergetic losses. On the other hand, the special phenomena which result from temperature gliding are proved by experiments. A simple equation is obtained, to evaluate dif-ferent zeotropic mixtures' exergetic losses. The maximum flow rate of heat-transfer fluids is found in order that refrigerants phase change can be completed. Lastly, some examples of zeotropic mix-tures ( R407C, R405A and R414B) are given, and their exergetic losses and maximum flow rate of heat-transfer fluids in condenser are forecasted. 相似文献
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Shaun D. Curran 《美中教育评论》2014,(10):737-742
The 21 st century classroom requires instructors with more advanced skills and competencies to deliver materials in a way that engages students both traditional and non-traditional. Traditional students have come to expect the incorporation of technology into their classrooms because they have grown up with it and can see its usefulness, while non-traditional students may need additional resources online in order to reinforce new concepts. By employing Web 2.0 technologies, like online video and discussion boards, into both the online and traditional on-campus classrooms, instructors can address both isolation and different learning styles, as well as address issues relating to problems with understanding concepts being taught and respond positively to feedback provided by both the students and administrators. In addition, utilizing Web 2.0 technology in the online classroom can reduce the isolation that many students feel in these classrooms by ensuring students can communicate with other students as well as the instructor. 相似文献
6.
Many zeotropic refrigerant mixtures are proposed as alternatives to some chlorofluorocarbons（CFCs） and hydrochlorofluorocarbons （ HCFCs ）. An advantage of zeotropic mixtures is the possibility of reduction in entropy generation by matching the temperature glidings of refrigerant and heat-transfer fluid in both condenser and evaporator. Zeotropic mixtures are compared with pure refrigerants to evaluate their exergetic losses. On the other hand, the special phenomena which result from temperature gliding are proved by experiments. A simple equation is obtained, to evaluate different zeotropic mixtures＇ exergetic losses. The maximum flow rate of heat-transfer fluids is found in order that refrigerants phase change can be completed. Lastly, some examples of zeotropic mixtures （R407C, R405A and R414B） are given, and their exergetic losses and maximum flow rate of heat-transfer fluids in condenser are forecasted. 相似文献
7.
The publication of the famous novel The Sound and The Fury projects the long-enduring reputation of William Faulkner as a household American writer in every nook and cranny of the world.Just in this novel,Faulkner employs the literary device of stream of consciousness and makes a good play with time and order to his own joy,which makes it an outstanding literary feature in the novel.In this essay,the unusual conceptions of time and order in the novel are tentatively probed mainly from the following three perspectives:1) the initiative for Faulkner creating the novel as a novel against time and order.2) the disordered arrangement as an artistic device——the optimum key to delivering the story.3) the potential order underlying the seeming disorder in the novel. 相似文献
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1IntroductionThe synthesis and characterization of nano-struc-tured materials are the subject of intense current re-search.Hyperfineγ-Fe2O3particle with good perfor-mance,such as magnetism,catalysis,gas-sensitivityand so on,are widely applied in various fields[1].It ishighly significant to research and develop the methodsfor synthesis of nanometerγ-Fe2O3.With the development of nano-science and nano-technology,the methods for preparation ofγ-Fe2O3have been greatly progressed,for example,… 相似文献
9.
Exploration and Practice of Improving College Students’ Speaking Competence through Group Discussion
The aim of English teaching is not only to make the students learn new words and grammar, answer multiple-choice questions to get good scores, but also to enhance the students’abilities of the integrated application of English, speaking and listening in particular. The ultimate goal of learning English is to use English to communicate with others in the future jobs and real life. However, the non-English majors have great trouble speaking English in class and in real life. Such ways as Socratic dialogues, cause analysis and questionnaire are used to investigate the reasons. In order to improve speaking ability, group discussion is used in class. In consequence, the students have more interest, motivation, courage and confidence in speaking English. Meanwhile, they have also established the concept of using what they learned in class, in practical work and real life. 相似文献
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基于偶极近似,运用电动力学方法研究了电流变液中悬浮颗粒在外电场作用下其形状的变化和微粒排列的取向,并计算了其形状的相对变化率,探讨了电流变液产生相变的微观机制． 相似文献
13.
袁欣欣 《赣南师范学院学报》2008,29(3):45-49
文献[1]在研究带Carleman位移和复共轭值的四元素边值问题可解的性时没有像对仅带复共轭值的四元素边值问题的研究那样完善,为了解决系数更具一般性的带Carleman位移和复共轭值的四元素边值问题的可解性,引入一组Carleman型问题,借助Carleman型问题的可解理论,完善了文献[1]的研究. 相似文献
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《International Journal of Educational Development》2005,25(4):395-407
International consensus on education priorities accords an important place to achieving gender justice in the educational sphere. Both the Dakar ‘Education for All’ goals and the Millennium Development goals emphasise two goals, in this regard. These two goals are distinguished as gender parity goals [achieving equal participation of girls and boys in all forms of education based on their proportion in the relevant age-groups in the population] and gender equality goals [ensuring educational equality between boys and girls]. In turn these have been characterised as quantitative/numerical and qualitative goals respectively. In order to consider progress towards both types of goal, both quantitative and qualitative assessments need to be made of the nature of progress towards gender equality. Achieving gender parity is just one step towards gender equality in and through education. An education system with equal numbers of boys and girls participating, who may progress evenly through the system, may not in fact be based on gender equality. Following Wilson (Human Rights: Promoting gender equality in and through education. Background paper for EFA GMR 2003/4, 2003) a consideration of gender equality in education therefore needs to be understood as the right to education [access and participation], as well as rights within education [gender-aware educational environments, processes, and outcomes], and rights through education [meaningful education outcomes that link education equality with wider processes of gender justice]. 相似文献
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Emotion regulation (ER) is an integral aspect of emerging adults’ mental health, yet little is known about interpersonal factors that influence ER in during this period. This investigation examines emerging adults’ desire to emulate parental ER skills in the relation between perceived parental ER and emerging adults’ emotion dysregulation.A sample of 79 emerging adults (Mage = 18.55 years, SD = .32; 88.6% female, 69.6% White) completed measures of perceived parental ER (Affective Style Questionnaire [ASQ]Hofmann and Kashdan 2010), emotion dysregulation (Difficulties in Emotion Regulation Scale [DERS]Gratz and Roemer 2004), and desire to emulate parental ER (Perception of Emotion Regulation Scale [PERS]).A desire to emulate parental ER skills moderated the relationship between perceived parental ER and emerging adults’ emotion dysregulation in general (B = -.10, SE = .048, t = ?2.07, p = .043), and low emotional awareness in particular (B = -.04 SE = .02, t = ?2.47, p = .02).Findings suggest that emerging adults with an increased desire to emulate parents with lower ER skills report greater emotion dysregulation. Implications for clinical practice, along with future directions for the field of ER, are discussed. 相似文献
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Klaus‐E. Jaritz 《Environmental Education Research》1996,2(1):51-62
This paper consists of two parts, the first one sets out the place of the case studies in the context of environmental education in German colleges and universities [1]. The case studies reported here should initiate inter‐university discussions on the objectives of, and the ways to incorporate, environmental education into the training for the pedagogical professions at German academic institutions. The second part tries to deduce generalisable aspects from the studies carried out in order to make some provisional conclusions about environmental education in pre‐service teacher education and the necessary research work in this field. Here use is made of the EEITE characteristics which Country Project Representatives agreed during their Summer Conference in 1993 as criteria to analyse the outcomes of the case studies [2]. 相似文献
17.
Social information processing, security of attachment, and emotion regulation in children with learning disabilities 总被引：1，自引：0，他引：1
This study examined the contribution of attachment security and emotion regulation (ER) to the explanation of social information processing (SIP) in middle childhood boys with learning disabilities (LD) and without LD matched on age and grade level. Children analyzed four social vignettes using Dodge's SIP model and completed the Kerns security scale and the children's self-control scale. Study results demonstrated major difficulties in SIP, lower attachment security, and less ER in children with LD compared to children without LD. Attachment as well as the interaction between attachment and ER emerged as important contributors to most SIP steps, suggesting that children with higher security who also have better ER skills will have better SIP capabilities along the different steps, beyond group inclusion. Results were discussed in terms of practical and clinical implications regarding the importance of mother-child attachment and ER skills for social cognitive capabilities in children with LD. 相似文献
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格赖斯的会话含义理论是语用学的一个重要理论。为了达到顺利进行交际的目的,根据格赖斯的理论,人们总会遵循一套相互合作的基本原则,也就是合作原则。然而,在实际交际过程中,人们又常常有意违反合作原则,产生会话含义。学习和掌握用会话含义理论分析话语,有利于人们提高文学鉴赏能力。 相似文献
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