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Engineering Science and Education Journal

Issue 6 • Date Dec 1994

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Displaying Results 1 - 8 of 8
  • The impact of III-V semiconductors on microelectromechanical systems

    Page(s): 271 - 275
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (332 KB)  

    This article examines the special features of the III-V semiconductors, such as gallium arsenide and chemically related compounds, which make them an attractive alternative to silicon-based technology in the field of microelectromechanical systems. As in conventional electronic systems, it is not expected that the III-V compounds will become exclusively used in all instances, but rather a substantial niche market-exploiting the special advantages of the compound semiconductors-is likely to be established View full abstract»

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  • Acting on impulse: applications of HV pulse technology

    Page(s): 277 - 286
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (588 KB)  

    High-voltage pulse technology began in the 18th century with the first attempts to simulate lightning. From the 1890s to the 1970s its importance in industrialised countries was concerned mainly with the development of HV and EHV transmission systems. The last two decades, however, have seen explosive growth of new applications in the aerospace, energy, defence, manufacturing and process industries. The paper describes the switching and pulse-forming techniques used to achieve features such as ultrafast risetime and high peak power, and reviews the use of HV pulse technology in a wide range of applications including fusion reactors, lasers, mineral extraction and processing, high-speed imaging and pollution-control systems View full abstract»

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  • Engineering education in rapidly industrialising Malaysia

    Page(s): 291 - 296
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (432 KB)  

    Malaysia aspires to be a fully industrialised nation by the year 2020. This has brought about a shift from what was predominantly an agriculturally-based economy to a rapidly expanding manufacturing-based one. This shift has brought to the fore the need for a large pool of people, especially engineers, with a strong base in science and technology. The government has embarked on various programmes to launch the bandwagon. This paper describes some of these programmes and measures that have been implemented or are now being planned, with a focus on engineering and engineering education at the tertiary level. Some recommendations are also made for supplementing the programmes already in place View full abstract»

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  • Microengineering design and manufacture using the LIGA process

    Page(s): 255 - 262
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (488 KB)  

    The need for design rules, new processes and methodologies for both the visualisation and analysis of microcomponents is outlined. Conventional planar microengineering has successfully resulted in producing transducer systems employing cantilevers and diaphragms. Artefacts possessing greater structural heights cannot be produced using this technology. The LIGA process, using X-ray radiation, is capable of producing microstructures in materials such as ceramics, polymers and electrodeposited metals having structural heights of up to 1000 μm and height-to-width aspect ratios of 100:1 to 1000:1. Where less stringent accuracy is required, visible radiation, such as UV and laser, may be used to form the structures. Optical LIGA has been used to produce fluidic valves, microwave couplers, microlens arrays and micro-optic devices. The basic steps in the design, processing and manufacture of LIGA components is described. Attention is drawn to the need to adapt existing finite element software in order to deal with components having small physical dimensions. LIGA microengineered components are handled on a laboratory scale using micromanipulators. A critical factor affecting the adoption of complex microengineered systems is the need for bulk handling and mass assembly techniques to be developed View full abstract»

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  • Will microengineering affect your business?

    Page(s): 244 - 248
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (320 KB)  

    Microengineering technology is leaving the research laboratories and has come of age. The paper gives a review of its benefits, opportunities, and applications. It also discusses how industry can bring on-board and incorporate this important strategic technology into its products View full abstract»

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  • A review of vibratory gyroscopes

    Page(s): 249 - 254
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    This paper describes the mechanical design of some vibratory rate gyroscopes. The principal commercial designs are identified and their operating principles are described. Only two designs based upon micromechanical methods of manufacture have been produced and these are still at an early stage of development. These designs are described and discussed View full abstract»

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  • Developing experimental skills in engineering undergraduates

    Page(s): 287 - 290
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (252 KB)  

    This article seeks to examine the relative importance of experimental activity within the curriculum of a contemporary engineering degree. In particular it considers ways in which experiments can be more efficiently undertaken, the use of computer simulation, the use of student-centred learning techniques and, in general, the likely future of the discipline View full abstract»

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  • Fabrication technology for microengineering

    Page(s): 263 - 269
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (452 KB)  

    This article reviews some of the more important technologies used for fabricating microcomponents and systems-bulk silicon micromachining, surface micromachining and LIGA, a process for forming deep microstructures by lithography, electroforming and moulding. The relative merits of using synchrotron, electron beam and excimer laser irradiation are discussed. A comb actuator and an electrostatic motor are given as examples of micromachined components View full abstract»

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Aims & Scope

The Engineering Science and Education Journal was published by the IET between 1992 and 2002.

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