Informatics Publishing Limited

Muhammad Aamir khan ¹, M. Rahman ¹, M. Hanif ¹, Muhammad Israr ², S. Fahad Shah ²

Affiliations
1 Department of Agricultural Mechanization, Faculty of Crop Production Sciences, The University of Agriculture, Peshawar, PK
2 Department of Rural Development, Institute of Development Sciences, The University of Agriculture, Peshawar, PK

Abstract

A high performance solar collector was developed to modify agricultural building environment such as dairy, poultry farm buildings and greenhouses. Moreover it should be efficiently utilized as a solar dryer for drying various agricultural products and by products. The materials used include steel sheet with high performance of reflecting light, absorber tube, and angle iron and fully insulated drying chamber. A CPTSC was a tilted at 340south (Equivalent to the latitude of Peshawar) Pakistan. A CPTSC a total reflecting surface area was 2.9 m2 respectively. The absorber tube having a surface of 0.376 m2 was fixed in front of the reflector at the distance equal to the focal length. The total volume of drying chamber was 0.3135 m3. An experiment was conducted to enhance the efficiency of the CPTSC and two air mass flow rate treatments were tested with normal and convective mass air flow rate, 0.6 kg. Min-1 and 1.72 kg. Min-1 under the average temperature of the month (January, February and March, 2012). Moreover, the process was replicated three times under the completely randomized design. The result showed that both air mass flow rate and average temperature of the month significantly effected the efficiency of a concentrating parabolic trough solar collector. The new model of a CPTSC increased the efficiency from 8 to 25 % with increase in both air mass flow rates and average temperature of the months. Therefore it is concluded that the solar collector efficiency increased with increasing air mass flow rate.

Keywords

Solar Energy, Solar Collector, Solar Drier and Collector Efficiency

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Rajan B. Jain ¹, O. P. Yadav ¹, M. Rahman ¹, S. Thippeswamy ², S. Fahmi ¹, D. K. Sharma ¹, Govind Singh ¹

Affiliations
1 Atomic Minerals Division, J.L.N. Marg, Uniara Garden, Jaipur - 302 004, IN
2 Atomic Minerals Division, Nagarabhavi, Bangalore, IN

Abstract

A partly concealed radioactive alibitized pegmatoid/quartz albitite body (1200 m x 0.5 to 20 m) containing 0.010 to 0.190% U₃O₈ and 0.007 to 0.076% ThO₂ and about 20 brick red coloured albitite lenses varying in dimension from 13 m x 7 m to 220 m x 12-30 m and containing 0.022 to 3.50% U₃O₈ and 2 are described at Banjaron Ki Dhani, new Maonda in north Rajasthan. Davidite, brannerite, rutile, anatase, zircon, monazite and traces of uraninite have been identified in the albitites. A metasomatic origin for the albitites is suggested. The distribution of albitites along NE-SW to NW-SE and E-W trending weak structural planes and the coincidence of 'Albitite Line' with Kaliguman lineament, demonstrates the tectonic control of albitization.

Keywords

Geochemistry, Albitite, Soda Metasomatism, Radioactivity, Rajasthan.

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M. Rahman ¹, A. B. M. A. Asad ¹, M. D. Nguyen ¹, T. Masaki ², M. P. Jahan ¹, T. Saleh ¹, Y. S. Wong ¹

Affiliations
1 National University of Singapore, 117576, SG
2 Masaki Giken, Osaka, JP

Abstract

Micro-EDM, a non-conventional machining process, is one of the most promising tool based micromachining technique which has the capability to machine micro-components with almost negligible amount of cutting force. Recent applications of micro-EDM process are increasing at an impressive rate and an explicit outcome of multidisciplinary research effort on the subject matter. This paper presents an overview of micro-EDM technology and some of the recent applications.

Keywords

Micro-EDM, Tool-Based Micromachining, Compound Micromachining, Multi-Process Micromachining.

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