State-of-the-Art of the Flywheel/Li-ion Battery Hybrid Storage System for Stationary Applications

This thesis presents the State-of-the-Art of a flywheel/Li-ion battery Hybrid Energy Storage System for stationary applications. As Renewable Energy Sources increase in the grid so do the stability problems associated with their intermittency. Here the importance of Energy Storage Systems that aim to provide many grid services. The complementary features of the two devices in terms of power, energy and discharge time candidate this hybrid system as an optimal solution to support future grids

State-of-the-Art of the Flywheel/Li-ion Battery Hybrid Storage System for Stationary Applications

This thesis presents the State-of-the-Art of a flywheel/Li-ion battery Hybrid Energy Storage System for stationary applications. As Renewable Energy Sources increase in the grid so do the stability problems associated with their intermittency. Here the importance of Energy Storage Systems that aim to provide many grid services. The complementary features of the two devices in terms of power, energy and discharge time candidate this hybrid system as an optimal solution to support future grids

Enhancement of student learning in the lecture theatre by means of a radio frequency feedback system

The principal formal teaching mechanism of universities is the lecture - a cost efficient format where hundreds of students may be taught by a single lecturer. Lectures' learning outcome is less certain; the lecturer has little ability to appraise the nature of the audience's understanding. The introduction of an electronic communication path from students to the lecturer mitigates this disjuncture. This communication path has been introduced and was found to be extensively used during a series of lectures, with each student provided with a handset that is reliable, inexpensive and portable. Upon these handsets are buttons; the data is transmitted at radio frequencies to the lecturer, aggregated and displayed graphically for quick assimilation. It has been recognised that this communication path permits the direct measurement of student's educational behaviour without disturbing the lecture itself. Preliminary results indicating the value of this research methodology have been obtained. A significant correlation was identified between the percentage of questions during the lecture students answered correctly and their previous year's overall academic mark. A correlation was identified between the number of times students initiate communication with the lecturer and the number of questions during the lecture they answered correctly. Mixed evidence was found regarding a possible correlation between the evidence of satisfaction with their learning students provided using the system and the number of questions during the lecture they answered correctly. The introduction of an electronic communication path into lectures has proved to be an innovation deserving of further research and wider introduction into teaching practice

JTIT

kwartalni

Measurement of space charge in the lower atmosphere

A double field mill is described which, when placed at a point abore the earth's surface, is automatically brought to the potential of that point and registers the potential gradient* Two such Instruments are employed to study space charge values In the first fire metres of the atmosphere. Comparison Is made between results obtained using the double mills and an Obolensky-type air filter, which lead to the conclusion that the latter instnuasnt gives incorrect readings in the presence of largp* small- ion concentrations. Space charge studies In fair weather conditions indicate the presence of a negative charge close to the ground of approximately -50µµC/m(^3), decreasing in the first two metres to aero and having an average value between one and three metres of +3µµC/m(^3). file average height to which this charge extends is shown to be proportional to the potential gradient, and has it's origin in ionization produced by radioactive substances in the earth, close to the surface. In disturbed conditions, heavy rain is found to generate a negative space charge of the order of -1000µµC/m(^3) arising from a splashing effect at the earth's surface. In snowfalls charges of +500µµC/m(^3) originate from the charge on the Individual snowflakes and a positive charge left in the air due to rubbing or shattering of the snow as it is falling*The fait weather results in the first metro show a good agreement with those of Norinder, but higher up show the usual positive charge found by Kahler, Daunderer, Scrase, Obolensky and Brown

Integrated seawater sampler and data acquisition system prototype : final report

This report documents the work performed by the Woods Hole Oceanographic Institution (WHOI) and the Battelle Memorial Institute from August 1988 to December 1992 in the NSF sponsored development of an Integrated Seawater Sampler and Data Acquisition Prototype. After a 6-month initial design study, a prototype underwater profiing unit was designed and constructed, containing the water acquisition subsystem, CTD and altimeter, control circuitry and batteries. A standard WHOI CTD was adapted for use in the underwater unit and was interfaced to the underwater controller which had a telemetry module connecting ít with a deck control unit. This enabled CTD data to be logged in normal fashion on shipboard while additional commands and diagnostics were sent over the telemetry link to command the underwater unit's water sampling process and receive diagnostic information on system performance. The water sampling subsystem consisted of 36 trays, each containing a plastic sample bag, the pump and control circuitry. The sample bags, initially sealed in a chemically clean environment, were opened by pumping the water out of the tray, thus forcing water into the bag by ambient pressure. The command system could select any bag, and control the water sampling procss from the surface with diagnostic information on system altitude, depth, orientation and cable tension displayed in real time for operator information. At sea tests confirmed the operation of the electrical and control system. Problems were encountered with the bags and seals which were partially solved by further post cruise efforts. However, the bag closing mechanism requires further development, and numerous small system improvements identified during the cruises need to be implemented to produce an operational water sampler. Finally, initial design tor a water sampler handling and storage unit and water extraction system were developed but not implemented. The detailed discussion of the prototype water sampler design, testing and evaluation, and new bag testing result are presented.Funding was provided by the National Science Foundation through Grant No. OCE8821977

New Perspectives on Electric Vehicles

Modern transportation systems have adverse effects on the climate, emitting greenhouse gases and polluting the air. As such, new modes of non-polluting transportation, including electric vehicles and plug-in hybrids, are a major focus of current research and development. This book explores the future of transportation. It is divided into four sections: “Electric Vehicles Infrastructures,” “Architectures of the Electric Vehicles,” “Technologies of the Electric Vehicles,” and “Propulsion Systems.” The chapter authors share their research experience regarding the main barriers in electric vehicle implementation, their thoughts on electric vehicle modelling and control, and network communication challenges

Intelligent Circuits and Systems

ICICS-2020 is the third conference initiated by the School of Electronics and Electrical Engineering at Lovely Professional University that explored recent innovations of researchers working for the development of smart and green technologies in the fields of Energy, Electronics, Communications, Computers, and Control. ICICS provides innovators to identify new opportunities for the social and economic benefits of society.　 This conference bridges the gap between academics and R&D institutions, social visionaries, and experts from all strata of society to present their ongoing research activities and foster research relations between them. It provides opportunities for the exchange of new ideas, applications, and experiences in the field of smart technologies and finding global partners for future collaboration. The ICICS-2020 was conducted in two broad categories, Intelligent Circuits & Intelligent Systems and Emerging Technologies in Electrical Engineering

Design of a research engine for homogeneous charge compression ignition (HCCI) combustion.

The design and development of a research engine for Homogeneous Charge Compression Ignition (HCCI) combustion was performed. The objectives were; to design and build an experimental apparatus for investigation of parameters affecting control of HCCI burn in engines, to commission the HCCI burn apparatus, to establish HCCI burn of lean fuel/air mixture, and to enable data acquisition of in-cylinder pressure measurements. A simple design methodology was followed. Three different concepts were presented along with the advantages and disadvantages of each. Concept three was chosen as the best alternative based on functional objective and cost. Several parameters were identified to affect control of HCCI burn in the literature review. Systems were designed to enable variability of these parameters and study of HCCI burn in a variable compression ratio engine. The criteria and constraints of all the systems of the apparatus were identified. Detailed design drawings and calculations of each system were performed to enable component selection. Testing was performed to verify the functional objectives of each system. Based on methodology, detailed design, fabrication, testing and verification, the project has met all the objectives. Recommendations for future work were made based on testing.Dept. of Mechanical, Automotive, and Materials Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis2005 .Z65. Source: Masters Abstracts International, Volume: 44-03, page: 1427. Thesis (M.A.Sc.)--University of Windsor (Canada), 2005