1,060 research outputs found
(correspondence) Azhar Ali
No full text都留からMahmood宛 Azhar Ali宛書簡あり。4件書簡オリジナルの所在: 一橋大学経済研究所資料室都留重人氏より寄贈1-A-2-15/2
Axisymmetric shell structures for multi-use
No full textShell structures find use in many fields of engineering, notably structural, mechanical, aerospace and nuclear-reactor disciplines. Axisymmetric shell structures are \ud
used as dome type of roofs, hyperbolic cooling towers, silos for storage of grain, oil and industrial chemicals and water tanks. Despite their thin walls, strength is derived due to the curvature. The generally high strength-to-weight ratio of the shell form, combined with its inherent stiffness, has formed the basis of this vast application. With the advent in computation technology, the finite element method and optimisation techniques, structural engineers have extremely versatile tools for the optimum design of such structures. \ud
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Optimisation of shell structures can result not only in improved designs, but also in a large saving of material. \ud
The finite element method being a general numerical procedure that could be used to treat any shell problem to any desired degree of accuracy, requires several runs in order to obtain a complete picture of the effect of one parameter on the shell structure. This redesign I re-analysis cycle has been achieved via structural optimisation in the present research, and MSC/NASTRAN (a commercially available finite element code) has been used in this context for volume optimisation of axisymmetric shell structures under axisymmetric and non-axisymmetric loading conditions. \ud
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The parametric study of different axisymmetric shell structures has revealed that the hyperbolic shape is the most economical solution of shells of revolution. To establish this, axisymmetric loading; self-weight and hydrostatic pressure, and non-axisymmetric loading; wind pressure and earthquake dynamic forces have been modelled on graphical pre and post processor (PATRAN) and analysis has been performed on two finite element codes (ABAQUS and NASTRAN), numerical model verification studies are performed, and optimum material volume required in the walls of cylindrical, conical, parabolic and hyperbolic forms of axisymmetric shell structures are evaluated and reviewed. Free vibration and transient earthquake analysis of hyperbolic shells have been performed once it was established that hyperbolic shape is the most economical under all possible loading conditions. Effect of important parameters of hyperbolic shell structures; shell wall thickness, height and curvature, have been evaluated and empirical relationships have been developed to estimate an approximate value of the lowest (first) natural frequency of vibration. \ud
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The outcome of this thesis has been the generation of new research information on performance characteristics of axisymmetric shell structures that will facilitate improved designs of shells with better choice of shapes and enhanced levels of economy and performance. \ud
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Key words; Axisymmetric shell structures, Finite element analysis, Volume Optimisation_ Free vibration_ Transient response
FIGURE 4. Vespa velutina. a in To the knowledge of Vespidae (Hymenoptera) of Pakistan
No full textFIGURE 4. Vespa velutina. a, habitus; b, head, frontal view; c, head and mesosoma, dorsal view; d, metasoma, dorsal view.Published as part of Mahmood, Khalid, Ullah, Mishkat, Aziz, Abdul, Hasan, Syed Azhar & Inayatullah, Mian, 2012, To the knowledge of Vespidae (Hymenoptera) of Pakistan, pp. 26-50 in Zootaxa 3318 on page 30, DOI: 10.5281/zenodo.28114
FIGURE 22. Anterhynchium flavomarginatum flavomarginatum. a in To the knowledge of Vespidae (Hymenoptera) of Pakistan
No full textFIGURE 22. Anterhynchium flavomarginatum flavomarginatum. a, habitus; b, head, frontal view; c, head and mesosoma, dorsal view; d, metasoma, lateral view.Published as part of Mahmood, Khalid, Ullah, Mishkat, Aziz, Abdul, Hasan, Syed Azhar & Inayatullah, Mian, 2012, To the knowledge of Vespidae (Hymenoptera) of Pakistan, pp. 26-50 in Zootaxa 3318 on page 48, DOI: 10.5281/zenodo.28114
FIGURE 2. Vespa orientalis. a in To the knowledge of Vespidae (Hymenoptera) of Pakistan
No full textFIGURE 2. Vespa orientalis. a, habitus; b, head, frontal view; c, head and mesosoma, dorsal view; d, metasoma, dorsal view.Published as part of Mahmood, Khalid, Ullah, Mishkat, Aziz, Abdul, Hasan, Syed Azhar & Inayatullah, Mian, 2012, To the knowledge of Vespidae (Hymenoptera) of Pakistan, pp. 26-50 in Zootaxa 3318 on page 28, DOI: 10.5281/zenodo.28114
FIGURE 5. Vespula flaviceps. a in To the knowledge of Vespidae (Hymenoptera) of Pakistan
No full textFIGURE 5. Vespula flaviceps. a, habitus; b, head, frontal view; c, head and mesosoma, dorsal view; d, metasoma, dorsal view.Published as part of Mahmood, Khalid, Ullah, Mishkat, Aziz, Abdul, Hasan, Syed Azhar & Inayatullah, Mian, 2012, To the knowledge of Vespidae (Hymenoptera) of Pakistan, pp. 26-50 in Zootaxa 3318 on page 31, DOI: 10.5281/zenodo.28114
FIGURE 13. Polistes olivaceus. a in To the knowledge of Vespidae (Hymenoptera) of Pakistan
No full textFIGURE 13. Polistes olivaceus. a, habitus; b, head, frontal view; c, head and mesosoma, dorsal view; d, metasoma, lateral view.Published as part of Mahmood, Khalid, Ullah, Mishkat, Aziz, Abdul, Hasan, Syed Azhar & Inayatullah, Mian, 2012, To the knowledge of Vespidae (Hymenoptera) of Pakistan, pp. 26-50 in Zootaxa 3318 on page 39, DOI: 10.5281/zenodo.28114
Lulusan Universiti al-Azhar dan impaknya terhadap pembangunan sosial di Malaysia
No full textKertas kerja ini lebih merupakan usaha tinjauan (pilot studies) awal daripada projek penyelidikan ilmiah ditaja yang diusahakan oleh pihak APIUM, dengan tema"Impak lulusan Universiti al-Azhar dalam
pembangunan sosial di Malaysia". Secara langsung kajian ini mempunyai kaitan yang signifikan untuk masyarakat dunia Melayu memandangkan bahawa boleh dikatakan kesemua pelajar yang terbabit dalam pengajian di Universiti al-Azhar adalah terdiri daripada manusia Melayu. (disalin dari artikel
Infopreneurship from the Perspective of Great Infopreneurs: an interview with Dan Poynter
No full textDan Poynter is author of more than 130 books, has been a publisher since 1969, and is a Certified Speaking Professional (CSP). He is an evangelist for books, an ombudsman for authors, an advocate for publishers, and the godfather to thousands of successfully published books. In this interview Poynter offers his point of view towards infopreneurship in context
Delta pyriforme Fabricius 1775
No full textDelta pyriforme (Fabricius, 1775) Figs 21 (a–d) Female: Body length 23.6 mm (n = 1), fore wing length 17.6 mm (n = 1). Material examined. PAKISTAN: Khyber-Pakhtunkhwa: Peshawar, 1 Ψ, 28.viii. 2008, Aziz (KPUAP). Punjab: Islamabad, 1 ɗ, 8.xi. 1989, Fida (PMNH). Distribution. Bhutan, Cambodia, China, Hawaii, Hong Kong, India, Indonesia, Malaysia, Moluccas, Myanmar, Nepal, New Guinea, Pakistan, Sri Lanka, Taiwan, Thailand and Vietnam. (Gusenleitner 2007, Srinivasan & Kumar 2010).Published as part of Mahmood, Khalid, Ullah, Mishkat, Aziz, Abdul, Hasan, Syed Azhar & Inayatullah, Mian, 2012, To the knowledge of Vespidae (Hymenoptera) of Pakistan, pp. 26-50 in Zootaxa 3318 on pages 44-45, DOI: 10.5281/zenodo.28114
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