Studying on the increasing temperature in IT-SOFC： Effect of heat sources   总被引：1，自引：1，他引：1  

ZITOUNI Bariza BEN MOUSSA Hocine OULMI Kafia 《浙江大学学报(A卷英文版)》2007,8(9):1500-1504

The dimensions and the materials type limit the performance of fuel cell. The increase of the temperature in electrodes and electrolyte of the cell,is due to the over potential of activation (transfer of load),the over potential Ohmic (resistance of polarization),the over potential of reaction (heat released by the chemical reaction) and the over potential of diffusion. In this paper,we studied the thermo-electrical performance of an intermediate temperature solid oxide fuel cell (IT-SOFC) with electrode supported. The aim of this work is to study this increasing temperature of a single cell of an IT-SOFC under the influence of the following parameters: heat sources,functioning temperature and voltages of the cell,geometric configuration and materials type. The equation of energy in one dimension is numerically resolved by using the method of finite volumes. A computing program (FORTRAN) is developed locally for this purpose in order to obtain fields of temperature in every element of the cell.  相似文献   

Low frequency oscillatory flow in a rotating curved pipe     

陈华军  章本照  苏霄燕 《Journal of Zhejiang University. Science. B》2003,(4)

INTRODUCTIONThemotionoftheflowinarotatingcurvedpipeisafundamentalproblem ,whosesolutionhaspotentialapplicationsingasturbines ,elec tricgenerators ,electricmotorsandsomeequip mentsusedinseparationprocesses.Itisimpor tanttoknowtheflowstructurecharacteristic…  相似文献   

Is equal access to higher education in South Asia and sub-Saharan Africa achievable by 2030?     

Sonia Ilie  Pauline Rose 《Higher Education》2016,72(4):435-455

  相似文献   

语文教学与儿童发展     

田本娜 《湖南第一师范学报》2002,2(2):64-69

“发展”是目前语文教学中普遍使用的术语，要正确理解它，既要学习传统教学发展理论，又要学习现代教学发展理论。小学语文教学的发展目标就是发展学生的语言能力、思想、情感及审美能力、思维能力，使他们掌握学习方法，养成良好的学习习惯。  相似文献   

Information effects on the response-reinforcer association     

Ben A. Williams 《Learning & behavior》1978,6(4):371-379

Pigeons were trained on a discrete-trial delayed reinforcement procedure with respect to one response key that was periodically illuminated. In some conditions, a second response key, or a tone, both previously paired with reinforcement, was interpolated in the delay-of-reinforcement interval. In comparison to a control condition with neither stimulus in the delay interval, the interpolated stimulus attenuated (blocked) the amount of responding that was maintained by the delayed reinforcement contingency. The degree of blocking was unaffected by whether the interpolated stimulus was the tone or keylight, in spite of the fact that the keylight evoked responding and the tone did not. A second study showed that the blocking effects involved the response-reinforcer association in that blocking occurred when the delayed reinforcement was response-dependent but did not occur when reinforcement was response-independent. The results thus show that response-reinforcer associations are affected by informational variables in the same manner as has been shown for stimulus-reinforcer associations. They also demonstrate that preexisting stimulus-reinforcer associations can block response-reinforcer associations, thus suggesting that both types of association depend upon the same associative process.  相似文献   

Understanding Students’ Perceptions of the Nature of Science in the Context of Their Gender and Their Parents’ Occupation     

Emran  Ameer  Spektor-levy  Ornit  Paz Tal  Ofra  Ben Zvi Assaraf  Orit 《Science & Education》2020,29(2):237-261

Science & Education - A thorough understanding of the concept of the nature of science (NOS) is essential to the development of scientific literacy among students, as it provides the students...  相似文献   

氯化亚汞声光器件换能器五层结构设计   总被引：2，自引：1，他引：2  

谢本亮 《赣南师范学院学报》2001,(3):21-24

提出用环氧树脂聚合物作为缓冲层 ,设计氯化亚汞声光器件的换能器。从器件的布喇格带宽出发 ,设计了五层结构的换能器 ,计算了以Ag为电极 ,ln或pb粘接层时 ,其五层的各自厚度 ,并确保了换能器倍频程带宽  相似文献   

Teachers' Interpretations of Effective Whole-class Interactive Teaching in Secondary Mathematics Classrooms     

Sonia Jones  Howard Tanner 《Educational studies》2002,28(3):265-274

Prompted by ongoing concerns over standards of numeracy, eight mathematics teachers from four secondary schools in south Wales formed a teacher inquiry group to research the impact of introducing whole-class interactive teaching strategies into their own practice. Possible teaching approaches and activities were developed and agreed during group meetings. These were trialled by the teachers during their normal mathematics lessons. Lesson observations, interviews with teachers and discussions at the group meetings, however, indicated that the implementation of the approaches varied significantly across teachers. This paper analyses the variation in interpretations and teaching styles, and discusses their impact on the quality of the classroom discourse. The determining features discerned within the classroom dialogue included the extent to which pupils were encouraged to reflect on their mathematical knowledge, and the ways in which teachers were able to scaffold pupils' learning.  相似文献   

Tennessee Promise: A Response to Organizational Change     

Ben Littlepage  Teresa Clark  Randal Wilson  Logan Stout 《Community College Journal of Research & Practice》2018,42(6):379-388

Community colleges in Tennessee, either directly or indirectly, experienced unprecedented change as a result of Tennessee Promise. The present study explored how student support service administrators at three community colleges responded to organizational change as a result of the Tennessee Promise legislation. Investigators selected community colleges for the multi-site case study because the legislative impact would be actualized by the preparations made to serve incoming Promise recipients. The delivery of orientation services framed organizational change because the service staff facilitate connections and provide information to incoming students. Challenges like a shifting population, ill-equipped infrastructure, inadequate remediation support, heightened interest for social engagement opportunities, misinformation, and unmet fiscal needs left administrators seeking coherence through the change process. Investigators found community college administrators react to change similarly. Administrators acknowledged change as continuous, created a culture of innovation among stakeholders, and were not afraid to fail as responses to the organizational change phenomenon.  相似文献   

Understanding the Relationship Between Latino Students’ Preferred Learning Styles and Their Language Spoken at Home     

Sonia Enid Maldonado Torres 《Journal of Latinos & Education》2016,15(3):244-252

The purpose of this study was to explore the relationships between Latino students’ learning styles and their language spoken at home. Results of the study indicated that students who spoke Spanish at home had higher means in the Active Experimentation modality of learning (M = 31.38, SD = 5.70) than students who spoke English (M = 28.08, SD = 5.36) or both languages (M = 30.79, SD = 5.93) at home. Students in all 3 groups—students who spoke Spanish, English, and both languages at home—had similar means and standard deviations in the Reflective Observation modality of learning.  相似文献