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GIS-Based Simulation of Engineering Construction Schedule 总被引：1，自引：0，他引：1
For its complexity, engineering construction schedule design is limited by various factors. Simulation-based engineering construction schedule takes critical path method （ CPM ） network as frame and calls complex cyclic operation network （CYCLONE） simulation model enclosed in advance for its simulation nodes. CYCLONE simulation model takes charge of simulating stochastic duration of activity and efficiency of resources, while CPM model performs project scheduling. This combination avoids the shortcomings of both models. Furthermore. geographic information system （ GIS ） technique is utilized to visualize the construction processes which are otherwise difficult to be understood by static results described. Application in practical project verifies the feasibility and advantage of the technique. 相似文献
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Maria Stack Hankey Penny L. Burge David B. Knight Richard W. Seidel Gary Skaggs 《Community College Journal of Research & Practice》2013,37(7):494-504
ABSTRACTThe purpose of this study was to examine community college engineering students’ perceptions of their classroom climate and how these perceptions are related to fundamental skills in engineering. The study was guided by the following research question: How are community college engineering students’ perceptions of their fundamental engineering skills related to their perceptions of classroom climate? Data from a 2009 National Science Foundation sponsored project, Prototype to Production: Processes and Conditions for Preparing the Engineer of 2020 (P2P), which contains information from students in 15 pre-engineering community college programs, were examined. Measures of classroom climate and fundamental skills related to engineering were first established through an exploratory factor analysis. In order to explore differences in student perceptions by individual characteristics and by institution, hierarchical linear modeling (HLM) was used. Results indicated that for community college engineering students, a warmer perception of classroom climate was associated with a higher perception of fundamental engineering skills. At community colleges, class sizes are generally smaller, especially compared to introductory courses at universities, and may provide a warmer climate for students considering beginning their engineering degrees. Given the diversity within community colleges, these institutions may provide an important pathway for underrepresented groups in engineering. 相似文献
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In a hybrid system, the subsystems with discrete dynamics play a central role in a hybrid system. In the course of engineering machinery of cluster construction, the discrete control law is hard to obtain because the construction environment is complex and there exist many affecting factors. In this paper, hierarchically intelligent control, expert control and fuzzy control are introduced into the discrete subsystems of engineering machinery of cluster hybrid system, so as to rebuild the hybrid system and make the discrete control law easily and effectively obtained. The structures,reasoning mechanism and arithmetic of intelligent control are replanted to discrete dynamic, continuous process and the interface of the hybrid system. The structures of three types of intelligent hybrid system are presented and the human experiences summarized from engineering machinery of cluster are taken into account. 相似文献
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To describe the spatial tendency and complex relationship of geological structures, a digital modeling based on geographic information system and the visualization of hydroelectric engineering geology information are presented. The functions of information visual query, spatial cutting, section drawing, and coupled analysis with hydraulic structures are realized. The geologic model can match the attribute data with the shape data of geological structures, and organize the information for spatial query and analysis of the 3D model. With an application in Laxiwa hydroelectric project on the upriver of Huanghe River, the method provides a 3D parallel section view and query results of geoinformation, and 3D section views of geoinformation along axis of spillway tunnel,and along the 5th axis with underground structures, respectively. 相似文献
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A number of internal and external pressures bear down on engineering colleges today. These include the shortage of experienced manpower, the rapid rate of scientific discoveries requiring absorption in curricula, the increasing college population, competition by industry for faculty members, and the need for additional income for plant expansion and faculty salaries. Within the body of engineering schools, one faction presses for the scientific reorientation of curricula while another holds to the professional art of design as the principle requirement in engineering colleges. Despite the traditional assumption that education is distinguished by large moments of inertia and that the time scale is measured in terms of generations, we lack sufficient time in a world of latent chaos. Positive and exciting internal forces must be injected into our dynamic system. 相似文献
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A Reanalysis of Engineering Majors’ Self-Efficacy Beliefs 总被引：1，自引：1，他引：0
This study examines differences in women??s engineering self-efficacy beliefs across grade levels in comparison to men??s engineering self-efficacy (ESE) beliefs across grade levels. Data for this study was collected from 746 (635 men, 111 women) engineering students enrolled in a large research extensive university. Four major conclusions resulted from this study. (1) No significant differences in overall mean engineering self-efficacy scores were found by gender. However, this study found differences between men??s and women??s mean coping self-efficacy (CSE) and engineering career outcome expectations (ECOE) subscale scores. Freshmen men had significantly higher ECOE compared to upperclassmen women. (2) Overall, fifthyear men had significantly lower mean ESE scores compared to all other groups. (3) When the fifth-year group was removed from the data set, all first-year students had significantly lower subscale scores compared to all other years. In addition, men in their first-year of engineering had significantly lower subscale scores compared to other groups of men. (4) No significant differences in overall ESE scores were found among first to fifth-year women. Also, no significant differences in self-efficacy subscale scores were found among first to fifth-year women. 相似文献
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《天津大学学报(英文版)》2004,10(2):i001-i001
Journal of Nanotechnology and Precision Engineering was first issued home and abroad in Dec. 2003, quarterly, with 80 pages per issue. 相似文献
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《天津大学学报(英文版)》2003,(4)
JournalofNanotechnologyandPrecisionEngineering ,ratifiedbytheNewsandPubli cationAdministrationofP .R .C ,willbefirstissuedhomeandabroadinDec.2 0 0 3 ,quarter ly ,with 80 pagesperissue. JournalofNanotechnologyandPrecisionEngineeringprovidesaninternationalmediumforthepublicationsinscience,engineering ,technologyrelatedtothefollowingfourassociat edfields:Nanotechnology ,MicroElectro MechanicalSystem ,PrecisionMachiningandPre cisionMeasurement.JournalofNanotechnologyandPrecisionEngine… 相似文献
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Faik O. Karatas Amy Micklos George M. Bodner 《Journal of Science Education and Technology》2011,20(2):123-135
This study investigated the views of the nature of engineering held by 6th-grade students to provide a baseline upon which
activities or curriculum materials might be developed to introduce middle-school students to the work of engineers and the
process of engineering design. A phenomenographic framework was used to guide the analysis of data collected from: (1) a series
of 20 semi-structured interviews with 6th-grade students, (2) drawings created by these students of “an engineer or engineers
at work” that were discussed during the interviews, and (3) field notes collected by the researchers during the interviews.
The 6th-grade students tended to believe that engineers were individuals who make or build products, although some students
understood the role of engineers in the design or planning of products, and, to a lesser extent in testing products to ensure
that they “work” and/or are safe to use. The combination of drawings of “engineers or engineering at work” and individual
interviews provided more insight into the students’ views of the nature of engineering than either source of data would have
offered on its own. Analysis of the data suggested that the students’ concepts of engineers and engineering were fragile,
or unstable, and likely to change within the time frame of the interview. 相似文献
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Students’ perceptions of engineering have been documented through studies involving interviews, surveys, and word associations
that take a direct approach to asking students about various aspects of their understanding of engineering. Research on perceptions
of engineering rarely focuses on how students would portray engineering to others. First-year engineering student teams proposed
a museum exhibit, targeted to middle school students, to explore the question “What is engineering?” The proposals took the
form of a poster. The overarching research question focuses on how these students would portray engineering to middle school
students as seen through their museum exhibit proposals. A preliminary analysis was done on 357 posters to determine the overall
engineering themes for the proposed museum exhibits. Forty of these posters were selected and, using open coding, more thoroughly
analyzed to learn what artifacts/objects, concepts, and skills student teams associate with engineering. These posters were
also analyzed to determine if there were any differences by gender composition of the student teams. Building, designing,
and teamwork are skills the first-year engineering students link to engineering. Regarding artifacts, students mentioned those
related to transportation and structures most often. All-male teams were more likely to focus on the idea of space and to
mention teamwork and designing as engineering skills; equal-gender teams were more likely to focus on the multidisciplinary
aspect of engineering. This analysis of student teams’ proposals provides baseline data, positioning instructors to develop
and assess instructional interventions that stretch students’ self-exploration of engineering. 相似文献
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This study reports on an educational development initiative where peer instruction was used instead of traditional lectures in a calculus course for first-year engineering students. The aim of the study was to explore students’ experiences of this method. Data were collected by means of an open-ended questionnaire on two occasions: early and late in the course. The data were analyzed with an inductive content analysis. The findings comprise three qualitatively different ways to experience the interactive teaching method in calculus: (1) enthusiasm, (2) nuanced skepticism and (3) aversion. The categories differed regarding emotional reactions to the teaching, experiences of learning, conceptions of teaching and learning, and experiences of meaningfulness. Many students expressed enthusiasm for learning with peer instruction and noted that the method gave both teachers and students feedback on what students have difficulties with. These students perceived that they were responsible for their own learning. Other students experienced that peer instruction had some advantages and disadvantages, and preferred a mix between traditional lectures and peer instruction sessions. They seemed to believe that teachers and students share responsibility for learning. Some students expressed an aversion for peer instruction and the method seemed to challenge their beliefs of how teaching and learning is best conducted. Our study illustrates that educational development initiatives, even though based on research on student learning, do not benefit all students. One of the major obstacles seems to be that students’ underlying beliefs regarding teaching and learning may be counterproductive to the ideas behind the educational initiative. We suggest that beliefs regarding teaching and learning need to be addressed when introducing new teaching and learning methods. 相似文献
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The purpose of this study was to examine what kinds of conceptions of entrepreneurial learning engineering students expressed in an entrepreneurship course integrated in their study programme. The data were collected during an entrepreneurship course in Estonia that was organised for fourth-year engineering students, using video-recorded group interviews (N?=?48) and individual in-depth interviews (N?=?16). As a result of the phenomenographic analysis, four qualitatively distinctive conceptions of entrepreneurial learning were discerned. Entrepreneurial learning was seen to involve (1) applying entrepreneurial ideas to engineering, (2) understanding entrepreneurial issues in a new way, (3) action-oriented personal development, and (4) self-realising through collective effort. These qualitatively distinct categories differed from each other in four dimensions of variation: nature of learning, response to pedagogy, relation to teamwork, and learning outcomes. 相似文献
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Research in Science Education - This sequential explanatory mixed methods study (quant + QUAL) examined elementary preservice teachers’ conceptions of teaching engineering. Participants... 相似文献
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Developing nations including Bangladesh are significantly lagging behind the millennium development target due to the lack of science, technology and engineering education. Bangladesh as a least developing country has only 44 engineers per million people. Its technological education and gross domestic product growth are not collinear. Although limited progress was made in humanities, basic sciences, agriculture and medical sciences, a vast gap is left in technical and engineering education. This paper describes the present condition of engineering education in the country and explores ways to improve engineering education in order to meet the national as well as global skills demand. 相似文献
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Eileen G. Merritt Jennie Chiu Erin Peters-Burton Randy Bell 《Research in Science Education》2018,48(6):1321-1337
The Next-Generation Science Standards (NGSS) challenge primary teachers and students to work and think like scientists and engineers as they strive to understand complex concepts. Teachers and teacher educators can leverage what is already known about inquiry teaching as they plan instruction to help students meet the new standards. This cross-case analysis of a multiple case study examined teacher practices in the context of a semester-long professional development course for elementary teachers. We reviewed lessons and teacher reflections, examining how kindergarten and first grade teachers incorporated NGSS scientific and engineering practices during inquiry-based instruction. We found that most of the teachers worked with their students on asking questions; planning and carrying out investigations; analyzing and interpreting data, using mathematics and computational thinking; and obtaining, evaluating and communicating information. Teachers faced challenges in supporting students in developing their own questions that could be investigated and using data collection strategies that aligned with students’ development of number sense concepts. Also, some teachers overemphasized the scientific method and lacked clarity in how they elicited and responded to student predictions. Discussion focuses on teacher supports that will be needed as states transition to NGSS. 相似文献
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Lingjun He Chuyuan Lin Peixun Xiong Hui Lin Wenbin Lai Jingran Zhang Fuyu Xiao Liren Xiao Qingrong Qian Qinghua Chen Lingxing Zeng 《天津大学学报(英文版)》2023,(5):321-346
Aqueous rechargeable batteries are safe and environmentally friendly and can be made at a low cost;as such,they are attracting attention in the field of energy storage.However,the temperature sensitivity of aqueous batteries hinders their practical application.The solvent water freezes at low temperatures,and there is a reduction in ionic conductivity,whereas it evaporates rapidly at high temperatures,which causes increased side reactions.This review discusses recent progress in improving the pe... 相似文献