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Articles by N. Ahmad
Total Records ( 9 ) for N. Ahmad
  Z.A. Rahman , U. Hamzah and N. Ahmad
  This study was designed to investigate the geotechnical properties of oil-contaminated soil for two different residual soils originally developed from in situ weathering of granitic and metasedimentary rocks. The physical characterisations of the soil were determined including particle size distribution, specific gravity test and X-Ray Diffraction (XRD). The engineering parameters for the contaminated and uncontaminated soils were Atterberg limits, compaction and soil shear strength. The amounts of hydrocarbon added to soil were varied at 0, 4, 8, 12 and 16% of dried weight of soil samples. The results from the particle size distribution analysis showed that residual soil from granitic rock comprises 38% sand, 33% silt and 4% clay while metasedimentary soil consists of 4% sand, 43% silt dan 29% clay. The mean values of specific gravity for the granitic and metasedimentary soils are 2.56 and 2.61, respectively. The types of minerals present in granitic soil sample are quartz, kaolinite and gibbsite while metasedimentary soil consists of quartz and kaolinite. The Atterberg limits value decreased as a result of increasing amount of added hydrocarbon into the soil. A similar behavior was observed with the values of maximum dry density and optimum water content with increasing hydrocarbon content. The maximum deviator stress, qmax for granitic and metasedimentary soils ranged between 6-28 kPa and 8-27 kPa, respectively. The overall unconsolidated undrained shear strength, Cu showed a decreasing trend with the increase in hydrocarbon content.
  Qamar-ul-Hassan Siddiqui , N. Ahmad , S.M.M. Shah Rashdi and S. Niazi
  Field studies were conducted in guava orchard near NIA experimental farm, Tandojam to evaluate an efficient trap height and optimum time for trapping the fruit flies as an important component of pest management. To determine appropriate trap height, lure toxicant traps were hung at the height of 2, 4, 6, 8 and 10 feet from ground level and adult flies captured were counted weekly. Similarly, to note diurnal activity of flies, five traps were hung at 10 feet height at 5.00 h and data was recorded after each 2 upto 19.00 h. It was noted that significantly highest number of flies were captured in the traps hung at 10 feet height and maximum population was recorded during 5-7 h.
  M.S. Sharar , M. Ayub , M.A. Nadeem and N. Ahmad
  In a field experiment, growth and grain yield of maize cultivar golden as influenced by different NP combinations were studied. The different NP combinations significantly affected the plant height, cob bearing plant m-2, number of grains cob-1, 1000-grains weight, grain yield and harvest index. The number of cobs plant¯1 was not influenced significantly by NP application. The NP application @ 180-130 kg ha-1 produced significantly higher grain yield (4.62 t ha-1) than all other NP combinations. The increase in yield was mainly due to higher 1000-grains weight, number of grains per cob and number of cobs bearing plant per plot. The results indicated that NP fertilizers should be applied @ 180-130 Kg ha-1 to obtain higher grain yield of maize cultivar golden under Faisalabad (Pakistan) conditions.
  C.S. Sipaut , N. Ahmad , R. Adnan , I.Ab. Rahman , M.A. Bakar , J. Ismail and C.K. Chee
  Modified fumed silica-epoxy nanocomposites were obtained by refluxing epoxy molecule with fumed silica using imidazole as catalyst. The modified fumed silica was then used as filler in epoxy resin with amine as curing agent. The properties of the surface modified silica and their effect as fillers in bulk epoxy composite were characterized by Fourier Transform Infrared spectroscopy (FTIR), Proton Nuclear Magnetic Resonance Spectroscopy (1H-NMR), Thermogravimetri Analysis (TGA), Differential Scanning Calorimeter (DSC), Coefficient of Thermal Expansion (CTE), Tensile testing, Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray spectrometry (EDX). From FTIR, 1H-NMR and TGA analysis, it was found that the epoxy resin was chemically bonded onto silica surface. From the DSC and CTE analysis, the addition of modified silica filler in the composite matrix highly influences thermal properties. This new synthesis filler shows higher glass transition temperature and more stable CTE data compared to unmodified filler when introduce into composite matrix. The tensile properties of composite matrix with and without the addition of filler show no significant difference in their tensile properties. SEM-EDX analysis show modified fillers have better adhesion with composite matrix compared to unmodified filler.
  R.F. A. ElSheikh , N. Ahmad , A.R.M. Shariff , S.K. Balasundram and S. Yahaya
  The study aimed to produce an investment classification map, which shows the potential areas of investment in agriculture in Sinnar, Sudan. The spatial multi-criteria analysis was used to rank and display potential locations, while the analytical hierarchy process method was used to compute the priority weights of each criterion. The study attempted to explore the utilization of Geographic Information System (GIS) to map the potential investment areas, therefore, it did not cover a comprehensive analysis of all factors that influence investment in agriculture. In addition, the analysis was limited to criteria that had spatial reference. The investment criteria for spatial analysis were defined from the guidelines provided by the Ministry of Investment, Sudan. Even with the shortcomings of the data, it was found that the results obtained were very encouraging and provided clear indicative areas for agricultural investment in Sinnar. Government agencies can use GIS to access information regarding the potential areas of investment, and minimize investment risks. On the other hand, the economic development organizations will now have the ability to benefit from the Geographic Information System (GIS) solutions by leveraging on this technology to attract and retain business from worldwide sources. Thus, the model will serve as a decision support tool for investors and decision makers at various levels.
  N. Ahmad
  The spatial and temporal expression of laminin α1, α3, α4 and α5-chain in the developing Xenopus laevis embryos was characterized using RT-PCR and whole-mount in situ hybridization. RT-PCR analysis shows varying developmental timings of expression of the laminin α-chain mRNA. The α1-chain mRNA was detected from stage 6 embryo and levels increase as the embryo develops to stage 41. α3 and α5-chain mRNA was found to be expressed maternally and also in the developing zygote. There was no maternal expression of the α4-chain and in the zygote, α4-chain mRNA was first detected at stage 14. Whole-mount in situ hybridization on embryos at stage 15, 25 and 33 showed that the α1, α3, α4 and α5-chain transcripts produced similar pattern of localisation. Transcripts were observed in the outer epithelia, somites, developing neural tube and pronephros.
  Yousaf Ali , M. Ahsanul Haq , G.R. Tahir and N. Ahmad
  The investigation was carried out to evaluate the influence of plant population on the seed yield and its components of a chickpea mutant (CM 2). Three each of inter (10, 20, 30 cm) and intra (5, 10, 15 cm) row spacings with plant population of 200, 100, 67, 50, 33 and 23 plants per m2 were included. The results indicated that increase in inter and intra row spacings significantly increased the plant height, number of pods per plant, seed yield per plant and per plot. It is suggested that for obtaining better yield in (CM 2) the crop should be sown at 23 plants per m2 instead of previously reported, optimum population of 33 plants per m2.
  R. Ahmad , N. Ahmad and M. A. Pervez
  Remote sensing of crop water stress using infrared radiation thermometers is one of the several important remote sensing applications. Remotely-sensed infrared canopy temperatures provide an efficient method for rapid, nondestructive monitoring of whole plant response to water stress. A logical extension of this technology is the use of canopy temperatures in screening crop genotypes for drought resistance. The potntial of using canopy temperatures in evaluating the genotypic response to drought is reviewed in this paper.
  Akbar Ali Rajput , M. Sarwar , N. Ahmad , Q.H. Siddiqui and M. Toufiq
  Eight chickpea genotypes were evaluated against the infestation of Helicoverpa species under the field conditions at NIA, Tandojam. Helicoverpa species were the most serious insect pests causing severe damage to this crop. In order to identify resistance against the infestation of this pest, seeds of the test genotypes were obtained from Plant Genetics Division of this Institute. Results depicted that all the genotypes showed varied response to the traits under observation. The data on larval population, percentage damage and yield components was highly variable, showing the percentage larval attack severity 1.00 to 50.00, pods damage 8.50 to 90.90% and 23.33 to 1920.00 gm grain yield of the sampling unit. Data revealed that genotype C-727 was relatively resistant against pod borer infestation as compared to other genotypes.
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