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1.
Design of ERT system 总被引：2，自引：0，他引：2
INTRODUCTION Electrical resistance tomography (ERT) is a technique producing images based upon variations in conductivity, and has great potential in process ap- plications (Tapp et al., 2003). In an ERT system, current is injected to a pair of drive electrodes and voltage measurements are taken between sense elec- trode pairs, yielding resistance information for image reconstruction (Cilliers et al., 2001). Traditional ERT systems usually use high fre- quency sinusoidal waveforms as … 相似文献
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Design of non-polarizing thin film edge filters 总被引：3，自引：0，他引：3
INTRODUCTION The design of tilted edge filters which avoid the polarization problems is a much more difficult task than that of polarizer design and there is no com-pletely effective method (Macleod, 2001). Edge fil-ters are divided into two main groups, long-wave-pass and short-wave-pass. They are widely used for vari-ous optical purposes, especially in wavelength divi-sion multiplexers (WDM) (Nosu et al., 1979) and multimedia color projection display (Zhang et al., 1999). Unfortunate… 相似文献
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A new electromagnetic suspension model using a combination of high temperature superconductors (HTS) and copper conductors is proposed in this paper. A feasibility study showed that the magnets of our model can generate the 250 kg vertical suspension force. Three dimensional FEM and Design Sensitivity Analysis using the levitation gap length and cross sectional dimensions of the HTS magnets as design parameters were conducted to obtain the optimal shape of the cross section and the configuration of the HTS magnet. It was found that the gap length when optimized HTS magnet was used was much larger than that when copper conductor magnet was used, while the HTS coil volume was minimum, and the perpendicular field along the outer surface of the HTS coil was less than 0.12 T. 相似文献
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INTRODUCTION The gymnasium project located in the newcampus of Zhejiang University is a symbol building(Fig.1). The requirements on the functions and theesthetics make it distinguished from a traditionalgymnasium. It is a two-story building with the firstfloor used for field competition and the second floorfor students’ basketball training. The heavy live loadsacting on the second floor and the requirement of 35m unobstructed space challenge the creativity of thestructural enginee… 相似文献
5.
Neural microelectrode has been used by neuro-physiologists to explore the neural system for over ahalf century. In 1950, the metal thread, called thefirst microelectrode, was invented[1]. The progresshas been strongly dependent on the technologies avail-able for providing microelectrode assembly for high-quality, long-term stable neural recording and forstimulation of specific populations of neural cells. In1965, Moll suggested that the lithographic techniquesand silicon etching technology tha… 相似文献
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ＡＦｏｒｍａｌＡｐｐｒｏａｃｈｔｏｔｈｅＤｅｓｉｇｎｏｆＮｅｔｗｏｒｋＰｒｏｔｏｃｏｌＬｕｏＪｕｎｚｈｏｕ（罗军舟）ＧｕＧｕａｎｑｕｎ（顾冠群）（ＤｅｐａｒｔｍｅｎｔｏｆＣｏｍｐｕｔｅｒＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅｅｒｉｎｇ，Ｓｏｕｔｈｅａｓｔ... 相似文献
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INTRODUCTION Oil-gas multiphase transport technology, in- cluding multiphase pressurization, multiphase flow- meter and multiphase flow control, has become very effective as an economic and reliable method for seabed oil exploitation. During the design of mixing transport system, prediction of pressure drop, heat transfer coefficients and void fraction is needed, so flow pattern identification is necessary. Among flow parameters, void fraction, defined as the cross section fraction occupie… 相似文献
8.
An intelligent detecting system based on wireless transmission is designed. Its hardware includes the card reading module, the wireless digital transmission module, the LCD module, the random password keyboard module and a 16×16 lattice word database based on e-Flash MM36SB020. Its software is a communication protocol between the central control computer and the entrance management base station. To resolve the conflicting problems occurred during the data transmission, a method of delaying time at random is proposed. 相似文献
9.
ＳｈａｐｅＯｐｔｉｍａｌＤｅｓｉｇｎｏｆＨｙｄｒｏｄｙｎａｍｉｃＢｅａｒｉｎｇＢａｓｅｄｏｎＤｙｎａｍｉｃＣｈａｒａｃｔｅｒｉｓｔｉｃｓＣｈｅｎＹｕｎｆｅｉ（陈云飞）ＱｉａｎＲｕｉｍｉｎｇ（钱瑞明）（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｃｈａｎｉｃａｌＥｎｇ... 相似文献
10.
Guangran Liu Hong Yin 《美中教育评论》2005,2(11):31-35
Currently, the intelligence and individuality of multimedia network courseware is not enough, which limits the universal development of modem long-distance education. It is the best way to develop network courseware with intelligence. The paper basing on ＂College English＂ introduces the idea of design, system structure and development of process. 相似文献
11.
Three-ring gear reducer , an internal gear planetarytransmission, claims many advantages , including largetransmission ratio, high loading capacity, and compactvolume[1].However ,there still exist some disadvantagesinits application.One is the unbalanced … 相似文献
12.
This article is mainly on the research of how to improve the design of children’s books. 相似文献
13.
The declining cost of precision motion controls allows economical replacement of mechanical drives with electronic versions in weaving processes. This paper describes the design of tension controller with electronic gearing. A control algorithm of PID is also introduced in order to improve performance of the tension controller. Finally, experimental results and conclusions are given. 相似文献
14.
ABSTRACT This paper reviews the software functionality that has evolved over the past two decades of research in Computer Mediated Communications at New Jersey Institute of Technology (NJIT) to create a Virtual Classroom® to support distance education. Based upon many years of evaluating its effectiveness we also summarize our views about the software functionality needed for further improvement of this approach to distance education. This view of a future Virtual Classroom® allows the instructor complete control over the learning materials and the tools to easily to weave in the learners as co contributors to a growing web of course knowledge. Beyond the current basic tools of the Virtual Classroom® we discuss the future role for hypertext, gaming and simulation, animation and multimedia and the role of the educator as a facilitator of a collaborative learning process. Both the proper software and the proper pedagogical techniques are necessary in order to obtain maximum effectiveness in the asynchronous computer‐mediated environment 相似文献
15.
Formative assessment has been recognized as an essential element of effective classroom practice; as a result, teachers are increasingly required to create formative assessments for their classrooms. This study examines data drawn from a long-term, site-based professional development program that supported a department of biology teachers in the iterative design and enactment of common formative assessment tools. We analyze teacher conversations to understand how teachers collaborated to design formative assessments. Results indicate that when teachers attended to problems of practice related to teaching evolution, increased transparency in their talk helped build consensus about the design of formative assessment tools. These results highlight the importance of encouraging transparency in teacher dialog when they are engaged in collaborative design of formative assessments. 相似文献
16.
PaulKawachi 《开放教育研究》2004,10(6):65-69
This Paper presents a series of empirical studies involving approx. 850 students to show howflexibility in course design should be informed by the student‘s culture and native language (L1), gender,and age, and explains how to decide on the most appropriate learning technology in course design by applying the Theory of Transactional Distance. Curves are presented to show how academic English reading ratesonline and offline are affected by the L1, gender, and age (over a wide age range 18-81 years old). Toprevent inequitable culturally-distinct overload, course design should be modified using hypertext. Choice ofmedia in particular synchronous versus asynchronous media is decided according to the Theory ofTransactional Distance. This theory is here extended from tutor-to-one-student to multiple students in agroup, and the masculinity can be modified. Briefly, at initial maximal distance ( D-S-) early on, thecommunity is fostered with synchronous media for cooperative group learning, followed by ( D-S ) collabo-rative learning using one of two frameworks presented to ensure constructivism in asynchronous mode, then(D-S ) collaborative for Guided Didactic Conversation in asynchronous mode, and finally ( D S -) coop-eratively in synchronous mode for reflective sharing of course learning experiences. At each transactional distance, tance, or in each mode, hypertext is purposively designed to complement the cooperative or collaborative styleto provide self-access support (additional analysis and reasoning to cooperative, and examples to collaborative) to provide equitable content and quality of learning across wide cultural and L1 ranges, to remove gender bias, and to accommodate variations due to student age. Thus, to promote student autonomy and lifelong learning. 相似文献
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18.
Paul Kawachi 《开放教育研究》2004,(6)
This Paper presents a series of empirical studies involving approx. 850 students to show how flexibility in course design should be informed by the students culture and native language (L1), gender, and age, and explains how to decide on the most appropriate learning technology in course design by applying the Theory of Transactional Distance. Curves are presented to show how academic English reading rates online and offline are affected by the L1, gender, and age (over a wide age range 18-81 years old). To prevent inequitable culturally-distinct overload, course design should be modified using hypertext. Choice ofmedia--in particular synchronous versus asynchronous media--is decided according to the Theory ofTransactional Distance. This theory is here extended from tutor-to-one-student to multiple students in a group, and the masculinity can be modified. Briefly, at initial maximal distance (D -S-) early on, the community is fostered with synchronous media for cooperative group learning, followed by (D- 相似文献
19.
This study describes the application of a new product concurrent design methodologies in the context in the education of industrial design. The use of the sketch has been utilized many times as a tool of creative expression especially in the conceptual design stage, in an intuitive way and a little out of the context of the reality needs that the design should be attended. This methodology systematizes and guides the process of sketching by means of a conceptual model and a geometric model toward a feasible solution, complementing the role of the sketch in the phase of a product conceptual design. The model describes its operating principles, as well as the phases of implementation in the context of teaching the industrial design illustrated with projects carried out in the workshop of conceptual design of the University Technical College of Valencia and University of the Bio-Bio, Chile. Finally, we discuss the implementation of the systemic models, their relation with the optimisation of the sketching process in the conceptual design stage, and their implications in the educational context. 相似文献
20.
John Minor Ross 《Performance Improvement Quarterly》1996,9(3):23-31
The current systematic approaches taught to. and perhaps used by, instructional designer's share much in common with structured computer software design approaches. The computing field is currently undergoing major changes fostered by the growth of object-oriented (OO) analysis, design, and programming methods. The OO paradigm may also offer a revised focus for ID research. Several instructional design (ID) researchers are already adopting OO computing terminology. The suggested cross-over of OO from computing to instructional design is tied to design trends and ongoing research in II). 相似文献