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LU Li-gang YAN Li-tan XIANG Li-chi 《浙江大学学报(A卷英文版)》2007,8(1):158-163
INTRODUCTION Throughout this paper, we shall work with a filtered complete probability space (?,F,(Ft),P) sat-isfying the usual conditions. Let B=(Bt)t≥0 be a stan-dard Brownian motion with B0=0. Denote by ú the set of all non-negative real numbers. Recall that a diffusion process X starting at x≥0 is called the square of a Bessel process of dimension δ>0 if d X t = δd t 2 | X t |d Bt , X 0= x, (1) Clearly, this equation has a unique non-negative strong solution X, i.e., … 相似文献
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Aimee Buckner 《英语辅导》2005,(12)
Whatmakesateacherexcellentinthefaceofcontroversy?AteacheroffersherTopEightlistforwaystoremaintruetoexcellenceinteachingdespitethetugofwararoundtesting. 相似文献
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INTRODUCTION The most obvious manifestation of gravitys effect on plants is the downward bending of roots and the upward growth of shoots. Gravity is an important factor in plant development (Barlow, 1995). The starch-statolith hypothesis proposed by Haberlandt and Nmec (Audus, 1962) is the most widely accepted view of how plants perceive gravity. Physiological data suggested that the amyloplast containing starch granules act as the statolith in higher plants. Sedimented amyloplasts ar… 相似文献
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INTRODUCTION The concept of group signature,first introduced by Chaum and van Heyst(1992),allows each group member(and only the group member)to sign mes-sages on behalf of the group,and requires that the receiver can use a group public key to verify the group signature,but cannot reveal the signer.The group signature should be traceable,i.e.the group authority can open the group signature and identify the signer.The outsider cannot identify all previous group sig-natures generated by the … 相似文献
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The thesis makes an attempt to conduct a comprehensive study on the author function through the work of Italo Calvino, and meanwhile endeavors to analyze the influence Calvino had from Roland Barthes's and Michel Foucault's discussion of the au?thor. 相似文献
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Paul Vare 《Environmental Education Research》1998,4(1):5-24
The Education and Communication for Sustainability in Africa (ECoSA) survey set out to provide an overall picture of environmental education provision in Africa in order to identify areas where European Union support could best assist the environmental education process. The survey gathered information through questionnaires, semi‐structured interviews at grass rodts level, country visits and a consultative workshop. A principal product of the survey was a databank with over 300 African organisations involved in environmental education. The Final Report reviews environmental education provision in different sectors as well as suggesting a number of guiding principles and proposing priority areas for European assistance. 相似文献
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To improve the static and dynamic performance of hydrodynamic journal beatings, a novel bearing is developed, which is a cone-shaped hydrodynamic bearing with spiral oil wedges. The major structural feature of this bearing is the three spiral circular recesses on the beating‘s surface, leading to improved characteristics. This paper aims to develop a model for design and calculation of the geometric parameters and the oil film thickness, and to provide a theoretical analysis to the static characteristics using a f‘mite element method. Some new features are introduced. 相似文献
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JIN Tao ZHANG Bao-sen TANG Ke BAO Rui CHEN Guo-bang 《浙江大学学报(A卷英文版)》2007,8(2):205-209
INTRODUCTION In the past 30 years, much progress has been achieved in thermoacoustic research (Backhaus and Swift, 1999; Garrett et al., 1993; Zhou and Matsubara,1998). However, most of them were still at laboratory scale. Aiming for industrial applications, recent re-searches began to pay attention to larger or smaller scale systems. The problem of heat dissipation from miniature high-tech products (say ICs, MEMS) at-tracts more attention due to the higher heat flux ac-companying th… 相似文献
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Mattias Lundin 《Journal of Science Education and Technology》2007,16(5):369-377
This article sets out to examine how school science activities can encourage students’ participation while supporting a specific
science content. One ordinary class with 12-year-old students was chosen and their regular classroom work was studied without
intervention and with a minimum of interference. Lessons were video filmed, transcribed and analyzed focussing on the participants’
speech acts. It was found that students’ initiatives and experiences were important parts of their participation. The results
show how students’ participation was orchestrated with a science content by means of four different kinds of activities. The
activities are called ‘individual inventory of experiences’, ‘building a common platform of experiences’, ‘sharing new experiences’
and ‘concluding a common platform’. The activities form a foundation for participation in human biology topics. For example,
to ‘build a common platform of experiences’ seems to level out students’ different prerequisites for participating in subsequent
tasks. Furthermore, to ‘conclude a common platform’ implied a checkpoint of the shared new experiences. The activities support
students’ tentative use of scientific words as well as their learning of what counts as knowledge in the school science setting.
However, it can be questioned if the time spent on each separate activity is necessary or if similar achievements could be
made even if some activities were integrated. The question is open for further research.
相似文献
| Mattias LundinEmail: |
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The aim of the present study is to conduct a systematic review research which focuses on research studies into the school practicum. In order to identify the main issues and also to provide a contemporary picture of practicum, 114 studies published on the topic are reviewed and analysed in terms of: (i) aims, (ii) main participants, (iii) methodology used and (iv) the main outcomes emerging. Many of the reviewed studies take pre-service teachers as their main participants. The review also shows that many practicum studies are relatively small-scale studies since they are mainly qualitative focused and findings derived from a relatively small sample. This suggests that more large-scale studies are needed in the field in order to provide greater insight into teaching practicum. Finally, this systematic review provides some food for thought in the area of practicum research and promotes further studies in this complex field. 相似文献
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XIAO Xingyan 《Frontiers of Education in China》2008,3(3):448
Due to the social environment of China’s reform and opening up, as well as China’s education system with knowledge impartation as its focus, some college students lack the humanistic care and education of value and significance of life. Universities should plan effective activities to make students realize the importance of life. They should provide students with such education as life conscience, failures in life, the ability to make a living and the values of life in order to have a clearer knowledge of life education, so that the students can set up a positive, healthy and correct life view, realize the value and meaning of life, and finally learn to respect life. 相似文献
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张兴友 《重庆大学学报(英文版)》2003,2(1)
1. Introduction Consider the problem (P) below 2 i(), for (,),txxxuuuuufxxtT++++=未a where the initial condition is 0(0,)()uxux=. Herein 0u and 2()fLT are square integrable complex functions on T; T is the 1-dimensional torus, +Ris the set of positive numbers, and a a real positive number. This type of equation was first introduced in the study of optical fibers [1]. Y. Martel [2] proved the well-posedness for the case of whole space R(the set of all real numbers) with a = … 相似文献
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In this paper,a dynamic model on a rigid rotor-sliding bearing system with a SFD is established.The stability and bifurcation behaviors of the system are studied,on The basis of the differential equations of fluid momentum and mass continuity,the distribution pressure function is derived by taking oil film inertia force into consideration.Damping force, clearance excitation force,interference force of different frequencies and static load are also considered in the model,Finally,the governing equations of the stability and bifurcation behaviors of the system are solved by Floquet theory,Simulation of dynamic model shows that the rigid rotor-sliding bearing system can maintain stability and exhibit a Hopt bifurcation phenomenon in a certain range. 相似文献
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《校园英语(教研版)》2015,(5):214-215
<正>The word I choose for this assignment is Friend.Three prototypical features:A.a person you know well B.a person who is not hostile C.a person who know for a long time Scenarios:1.When Ben is going through his friends’Facebook pages,he always finds a guy called John and John’s comments are funny and smart.Therefore,Ben sends a friend invitation to John,and John accepts it immediately.Is John Ben’s friend? 相似文献
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Anna Emilia Berti 《European Journal of Psychology of Education - EJPE》1993,8(2):183-193
Forty-three 5th graders participated in all phases of the study:
- a pre-test to ascertain children’s concepts of deposits, loans, interest, etc.;
- a classroom lesson;
- a post-test two weeks after the lesson.
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This article presents a role-play game for software project management (SPM) in a three-dimensional online multiuser virtual world. The Opensimulator platform is used for the creation of an immersive virtual environment that facilitates students' collaboration and realistic interaction, in order to manage unexpected events occurring during the development of a software project. Through the simulation of a real-life company, the game aims to enhance experiential learning of human-related issues, such as project team members’ communication and collaboration, which are not easy to be taught through ordinary teaching methods. Roles are assigned to the participating students, who have to overcome problems initiated by non-player-units (software controlled units) while collaborating with other students and the instructor. The instructor, holding a key role in the game, is able to observe the players, intervene and dynamically alter specific game scenario parameters adapting to player encounter difficulties. The environment is combining the experience of a typical game (based on an event-driven SPM scenario and interaction with non-player-units), with the experience of a virtual world (interacting with other players) and has been positively evaluated by the participants regarding the overall game experience and the learning effect. 相似文献