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Articles by N.M. Adam
Total Records ( 4 ) for N.M. Adam
  F.A. Ansari , A.S. Mokhtar , K.A. Abbas and N.M. Adam
  The present work is to demonstrate how some very simple problems are made mathematically complex and seemingly tedious due to academic or business compulsions. There are some problems in which mathematical model are developed after making many simplifying assumptions. But, when it comes to solving these models, very sophisticated and complex schemes are applied. For such problems, dual policy does not make sense and in many cases the problem may be tackled in a simpler way to get comparable accuracy. The present paper reports one such example. It deals with the development and authentication of computer software for estimating building cooling load. The software is simpler to use, needs fewer input data and is more versatile compared to any other commercially available, exorbitantly costly and extensively used software. The effects of significant building parameters like orientation, window glass shade type, number of glass panes used, wall insulation, roof type and floor type can be easily investigated. Effects of all these parameters have been investigated for a typical building block to arrive at an intelligent decision. With any other software or method, it cannot be made so conveniently. All the above mentioned advantages are without sacrificing accuracy and reliability.
  Y.M. Bande , N.M. Adam , Y. Azmi and O. Jamarei
  Bitter melon seed (Egusi) is of medicinal value in addition to being a food source, biofuel and in cosmetics. Its dehulling has been a problem to its farmers and properties are moisture dependent. The aim of determination of these properties is to guide the design of processing equipment for planting, storing, dehulling and other post-harvest processing. In moisture range of 7.11-38.70% in dry basis, 1000 seed mass increased from 0.0949-0.1299 kg and surface area from 25.394-27.827 mm2 while geometric and arithmetic mean diameters were 2.83-2.98 and 7.66-8.79 mm, respectively,. At moisture level of 7.11% in dry basis, average length, thickness and width of Egusi “bitter” melon seed were 13.199, 1.853 and 7.924 mm, respectively. Decrease was recorded for Sphericity (from 0.215-0.196) and Porosity (0.541-0.444%) while angle of repose increased from 23.66-33.63°. Bulk density rose from 414.006-456.339 kg m-3 while true density decreased from 901.515-821.668 kg m-3. Coefficient of friction on aluminium (0.2736-0.3172) and PVC (0.2999-0.3782) plywood (0.3388-0.3598), metal (0.2767-0.3198), were obtained by relating the angle made to the height, as the seeds start to slide along an inclined plane made of each material. Seed hull breaking force on horizontal axis increased but a decrease was observed on vertical axis.
  Y.M. Bande , N.M. Adam , B.O. Jamarei and Y. Azmi
  The aim of the present work is to determine the physical and mechanical properties of Egusi melon fruits. These properties are required for the purpose of mechanizing the harvest and post harvest operations of the fruits, such as storage, transportation, processing and packaging. This paper presents some of these properties in relation to the “Egusi” fruit and how they were determined and values obtained. It uses have been identified in medicine, cosmetics and as a biodiesel feedstock. Basic dimensions and mass were determined with a digital gauge and scale with accuracy 0.01 mm and 0.01 g, respectively. Maximum length, width, thickness and mass of 100 samples were 12.86 cm, 12.53 cm, 15.52 cm and 1031.5 g, respectively. Arithmetic and Geometric mean diameters were between 5.68-13.63 and 5.58-13.22 cm while mean Bulk and True densities were 404.98 and 1074.6 kg m-3 on 3 and 6 runs, respectively. The sphericity and aspect ratio were about 1, with average packaging coefficient on 5 separate runs of 33.49. The average vertical and horizontal weight to break the fruit was 121.23 and 74.09 kg, respectively. These findings will guide Egusi harvesting machine design and also gives information on loading capacity in transportation and storage of the harvested fruit prior to processing.
  Q.J. Kwong , S.H. Tang and N.M. Adam
  This study aims to identify the thermal environment of an enclosed transitional space in a tropical educational institution and occupants’ perceptions on thermal comfort. The methods applied were field survey, which covered objective measurement and subjective assessment, as well as Computational Fluid Dynamics (CFD) simulation. Comparisons were made between the empirical and predicted results. In this study, it was identified in the field assessment that most of the respondents were satisfied with the thermal environment in the enclosed lift lobby and preference was directed towards cooler environment. The predicted results showed fair agreement with the empirical results, with minor differences between the two results for the thermal and airflow conditions. Besides, a lower expectation factor in PMV index is required for thermal environment in transitional spaces. Analysis of thermal neutrality in this survey has demonstrated that the thermal conditions in the enclosed lift lobby were acceptable by 80% of the respondents. The methods applied in this study can be extended to other enclosed transitional spaces in the tropical buildings.
 
 
 
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