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Articles by M. Ahmad
Total Records ( 4 ) for M. Ahmad
  A. W. Baloch , A. M. Soomro , M. A. Javed , M. Ahmad , H .R. Bughio and M. S. Bughio
  Three mutant strains basmati 370-32, Jajai 77-30 and Sonahri sugdasi-6 along with their respective mother varieties Basmati 370, Jajai 77, sonahari sugdasi and check variety Basmati 385 were evaluated under different plant population (spacings: 20 x 20 cm2, 22.5 x 22.5 cm2 and 25 x 25 cm2 between plants and rows) for grain yield and yield contributing parameters. An increase in spacing induced vigorous plant growth as well as increased the number of panicles per hill, grain yield per hill, filled grains per panicle and 1000 grain weight. The spacing 22.5 x 22.5 cm2 proved more appropriate because it produced better plant stand, gave more panicle density and higher grain yield than other two spacings. The mutant strain Jajai, 77-30 produced significantly (P<0.01) higher grain yield at all spacings as compared with all other entries.
  S. Hamdan , D.M.A. Hashim , M.Z. Abdul Rahman , M. Ahmad and W.F. Wan Abdullah
  The thermo mechanical properties of poly (methyl methacrylate-co-styrene) copolymers as a function of strain rate and temperature in the range 10-3 to 10-1 s-1 and 30-200° C respectively were investigated. Copolymers of three different Methyl Methacrylate (MMA) and STyrene (ST) ratios with various percentages of cross-linking agents were prepared and tested. By measurement of the stress versus strain at various strain rates and temperatures, plots of flow stress/temperature (σƒ /T) versus strain rate (⋵) and log Young’s Modulus (log E) versus Temperature (T) were obtained. Plot of (σƒ /T versus ⋵ observed the Eyring equation. Increasing the amount of cross-linking agent improved the copolymer strength. The graph for log E versus T plot at constant stain rate indicates that a transition temperature exist at ~ 110 ° C. This is attributed to the glass transition i.e. the zones are interpreted in terms of visco-elastic transition.
  M.A. Malana , M. Ahmad , T.M. Ansari , S.S.R. Naqvi and M. Ali
  In the present work, quality of twelve commercial gear oil brands has been assessed by evaluating the physical characteristics and phosphorus contents. Physical parameters (Flash point, Pour Point, Viscosity index and Kinematic viscosity) and phosphorus contents were determined by standard test methods recommended by the American Society for Testing and Material (ASTM). Evaluated parameters have been compared with PSI standard specifications and the manufacturers specifications. Results indicate that none of the gear oil samples satisfy fully PSI standard test limits specified for Extreme Pressure Grade gear oils. Only a few samples have fulfilled the specifications given by the manufacturers. Marketing of sub-standard gear oil products in Pakistan is an alarming situation. Government of Pakistan should take strict measures to improve the quality of gear oils widely used in sophisticated machines.
  S. Hamdan , D.M.A. Hashim , M. Ahmad and C.C. Khei
  Three series of Polypropylene (PP) specimens, namely series A (without glycerol), B (with 5% glycerol) and C (with 10% glycerol) with various percentage of Decabromodiphenyl Ether (DBDE), were studied using Dynamic Mechanical Thermal Analyzer (DMTA). For series A specimen, pure PP (0% glycerol and 0% DBDE) yield the highest storage modulus E’, and the 2% of DBDE gave the lowest (most degradable) E’. 5% DBDE in series B specimen (5% glycerol) produced the lowest E’ while in series C specimen (10% glycerol) 5% DBDE yield the highest E’. For series C specimen, 0.5% DBDE yield the lowest E’ (the most degradable blend). Below the transition temperature E’ did not necessarily decreased systematically with increasing percentage of DBDE for C series specimen.
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