115 research outputs found
Development of Design for Manufacturing Assembly (DFMA) Software in Bahasa Melayu
No full textThe purpose of this paper is to present a new DFMA software that is created in Bahasa Melayu. The software was developed to assist in teaching the subject Design for Manufacture and Assembly for undergraduate students. The software is created using Visual Basic and MySQL. The software is based on Boothroyd Dewhurst DFMA methodology. Currently, teaching this subject uses manual procedure which is time consuming but it helps to strengthen the foundation of Boothroyd Dewhurst method. The software saves up to 97% of the time needed for manual procedure. This software is developed in
Bahasa Melayu to differentiate it from the official Boothroyd Dewhurst software and any other software related. Even though the contents are in Malay, there are also English
translation as most terms are familiar in English. Since the university had yet to obtain Boothroyd Dewhurst software, the
author refer its content with the promo version of the original Boothroyd Dewhurst software that was supplied by vendors
Design for manufacture: a methodology to evaluate an aircraft design in order to ensure its manufacturability
No full textThe aim of the research is to develop a methodological analysis of problems in the
area of design for manufacture in low volume high complex products found in the
writer’s workplace. The majority of research in this area has been around high
volume products, such as automotive products and little consideration has been given
to designing complex products from industries like aircraft manufacture.
This research evaluates design for manufacture (DFM) information in the design lifecycle
(DLC). The author’s research introduces a unique DLC process, one which
structures decisions and data transfer through the DLC. The research also looks at
current academic work and introduces industrial issues present in today’s
environment.
It is crucial to the design of a product to select the appropriate design environment in
which it operates, as it will structure the way the engineering activities are established
and developed. It is also important for the organisation to decide on the environment
in which the design definition should evolve. Therefore the research reviews the
different design definition environments, these were carefully analysed by the author.
The evaluation of a design to ensure its manufacturability is a major element in the
research, a review of previous work has highlighted that within current publications
there has been little work in this area. The research has developed a methodology to
evaluate the robustness of a design. It not only looks at the engineering design but
also evaluates its adherence to customer requirements and the effect on cost for the
overall product life-cycle. It also considers industrial needs for a reduction in the
length of design life-cycle, while ensuring a reduction in manufacturing costs. There
are two main contributors to this, firstly the use of key characteristics and secondly,
the ability to control the manufacturability of a design. The author has developed a
novel software tool enabling efficient evaluation of a design.
The author discusses his contribution to existing knowledge in three main areas of the
research. The most significant being the introduction of a tool to evaluate a design
early in the design life-cycle to ensure manufacturability. To validate the research the
author introduces the reader to three experimental phases. He validates his
methodology by analysing the design of various aircraft assemblies discussing his
findings of how manufacturable the designs are. This leads to the conclusion that the
author’s research adds substantial knowledge to the area of design for manufacture
Amorphous metal diffusion barriers for semiconductor contacts
No full textSIGLEAvailable from British Library Document Supply Centre- DSC:D59236 / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Mapping boron in silicon solar cells using electron energy-loss spectroscopy
No full textAmorphous silicon solar cells typically consist of stacked layers deposited on plastic or metallic substrates making sample preparation for transmission electron microscopy (TEM) difficult. The amorphous silicon layer - the active part of the solar cell - is sandwiched between 10-nm-thick n- and p-doped layers. The typical boron concentration in the p-doped layer is ~10^21cm -3 and should not exceed 1017cm-3 in the neighbouring intrinsic (i) layer [1], where it acts as a charge recombination centre and decreases the internal electric field [2]. The detection of low boron concentrations with high spatial resolution using TEM is highly challenging [3]. Recently, scanning TEM (STEM) combined with electron energy-loss spectroscopy (EELS) and spherical aberration-correction has allowed the direct detection of dopant concentration of 10^20cm-3 in 65-nm-wide silicon devices [4]. Here, we prepare TEM samples by focused ion beam milling in order to map the boron distribution across a 200-nm-thick n-p amorphous silicon junction using energy-filtered TEM and EELS spectrum acquisition. EELS line scans are used to detect boron concentrations as low as 10^20cm-3. We also use monochromated EELS to measure changes in the energies of plasmon peaks in the low loss region [5]. We use these approaches to characterize both a thick n-p junction and the 10-nm-thick p-doped layer of a working solar cell. [1] U. Kroll, C. Bucher, S. Benagli, I. Schönbächler, J. Meier, A. Shah, J. Ballutaud, A. Howling, Ch. Hollenstein, A. Büchel, M. Poppeller, Thin Solid Films 451 (2004) 525 [2] B. Rech, H. Wagner, Applied Physics A 69 (1999) 155 [3] C.B. Boothroyd, K. Sato, K. Yamada, Proceedings of the XIIth international congress for electron microscopy, ed LD Peachey and DB Williams (San Francisco Press, San Francisco, 1990) 80 [4] K. Asayama, N. Hashikawa, K. Kajiwara, T. Yaguchi, M. Konno, H. Mori, Applied Physics Express 1 (2008) 074001 [5] V. Olevano, L. Reining, Physical Review Letters 86 (2001) 596
One-pot synthesis of new-phase AgInSe2 nanorods
No full text10.1021/ja060543uJournal of the American Chemical Society128227118-7119JACS
Boron segregation in a (Fe, V, B) TiAl based alloy
No full textPrimary boron containing dispersoids grown from the melt in a Ti-45.5at.%Al-1.6at.%Fe-l.lat.%V-0.7at.%B alloy, and then annealed at 1473K, have been investigated using optical microscopy, conventional transmission electron microscopy (CTEM) and analytical electron microscopy. The dispersoid morphology is in the form of high aspect ratio plates, hundreds of microns across and cross-sectional widths of just a few hundred nanometers, rather than a blocky or equiaxed morphology. These dispersoids are not monocrystalline, but have a layered structure parallel to the plane of the plates. The dispersoids are distributed with random orientations throughout the matrix and delineate the edges of lamellar domains, formed by the solid state transformation [MATH]. Microchemical analysis by windowless energy dispersive x-ray analysis (EDX) and serial electron energy loss spectroscopy (EELS) show that the chemical structure of these zones is in fact a mixture of interleaved phases, rather than a single faulted boride crystal. Boron mapping across the zones edge on to the plates and quantitative EDX reveals boride plates down to a few nm wide have formed interleaved with ordered [MATH]-phase (B2 CsCl structure). It is concluded that primary borides and [MATH]-phase simultaneously nucleate within the melt, and the [MATH]-phase is stabilized to room temperature by Fe and V segregation. Hence the borides can act as grain refiners by providing nucleation sites for [MATH]-phase at high temperatures
Site-specific growth of ZnO nanowires from patterned Zn via compatible semiconductor processing
No full text10.1016/j.jcrysgro.2008.01.012Journal of Crystal Growth310102485-2492JCRG
The growth mechanism and field-emission properties of single carbon nanotips
No full text10.1088/0957-4484/17/15/006Nanotechnology17153655-3661NNOT
The rise and fall of the Labour league of youth
No full textThis thesis charts the rise and fall of the Labour Party’s first and most enduring youth organisation, the Labour League of Youth. The history of the League, from its birth in the early nineteen twenties to its demise in the late nineteen fifties, is placed in the context of the Labour Party’s subsequent fruitless attempts to establish and maintain a vibrant and functional youth organisation. A narrative is incorporated that illuminates the culture, organisation and political activism of the League and establishes it as a predominantly working class radical organisation. The reluctance on the part of the Labour Party to grant autonomy to its youth sections resulted in the history of the League of Youth being one of control, suppression and tension. This state of affairs ensured that subsequent youth groups, the Young Socialists and Young Labour, would be established in an atmosphere of reservation and scepticism.
The thesis places the prime responsibility for the failure of the party’s youth organisations with the party leadership but also considers the contributory factors of changing social and political circumstances. A number of themes are explored which include the impact of structure and agency factors, the power of the Parliamentary Labour Party, the political socialisation of leading figures within the party, the social context in which each of the groups emerged and the extent to which the youth groups were prey to intra-party factionalism.
The thesis redresses the balance of research where most accounts have focussed on the Young Socialists and traces the common characteristics that are prevalent in the way the party leadership has approached its relationship with its youth organisations. Use has been made of previously unpublished primary source material, the major source being the League of Youth members themselves whose recollections have helped to demonstrate the arguments put forward in this thesis
Aural Rehabilitation as Comprehensive Hearing Health Care
No full textIn a 10-year-old publication, the author defined aural rehabilitation holistically and indicated that the evidence for effectiveness fell as one moved through the areas of function, activity, participation, and quality of life. Several developments since then warrant consideration. One is an increased recognition that hearing is a cognitive process. In this connection, special attention is being paid to listening effort. At the time of writing, this work is already influencing the design and marketing of hearing aids and, along with direct wireless connectivity, may well impact other components of aural rehabilitation. Another development is the increasing availability of low-cost hearing aids and personal sound amplification products for direct purchase. Combined with developments in self-testing and self-fitting, direct-to-consumer and low-cost hearing aids create an opportunity for dispensing audiologists to develop a more holistic approach to meeting the needs of people with hearing loss—as envisaged in the scope of practice outlined by the American Speech-Language-Hearing Association and as advocated by numerous writers over the past several decades.</jats:p
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