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Search Results: 1 - 10 of 145090 matches for " F Arshad "
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Bayesian Regression with Prior Non-sample Information on Mash Yield
A. Ghafoor,F. Muhammad,I.A. Arshad
Journal of Applied Sciences , 2005,
Abstract: To increase the precision of estimated effect of a yield character "pod length" on mashbean grains yield, Bayesian regression technique with sample and prior non-sample information about pod length was applied on simple linear relation between mash grain yield and pod length. With the use of prior inequality information about regression coefficient on pod length, a reduction was observed in the estimated value of regression coefficient and its standard error. It was observed that prior inequality information about regression parameter is helpful to increase the precision of the regression estimates. Simulation procedure was developed to generate random residuals from Exponential (1) and Uniform (0, 1) distributions, to test the results. The results were compared with those based on original data set.
Multivariate Analysis of Mash Data
I.A. Arshad,F. Muhammad,A. Ghafoor
Journal of Applied Sciences , 2005,
Abstract: Different mash plant traits contributes to the mash grain yield but the major contributors are plant height (X1), days to flowering (X2), days to first pod maturity (X3), days to 90% maturity (X4), branches per plant (X5), pods per plant (X6), pod length (X7), seeds per pod (X8), 100-seed weight (X9), biological yield per plant (X10) and mash grain yield (Y). This study was initiated to find the important regressors on which the yield of mash depends. In this regard principal component analysis and path analysis were used to find correlation structure between mash plant traits and regressors effect on mash grain yield, respectively. Principal component analysis reduced the dimensionality in the system of eleven mash plant traits to four principal components, which contributes about 88% of the total variability present in the mash plant data. On the basis of correlation between principal components and original mash plant traits, a classification structure was made to observe the relation between different traits. It was observed that for the first principal component, plant height (X1), days to flowering days to first pod maturity (X3), days to 90% maturity (X4) and 100 seeds weight (X9) have positive correlation between themselves i.e. varies in the same direction. Path analysis was also described to explain correlation structure, direct-indirect effects between different mash plant traits. This analysis suggested that pod per plant has maximum positive direct effect on mash grain yield i.e. more pod per plant, greater will be the yield. But days to 90% maturity has maximum negative direct effect on mash grain yield i.e. more maturity lesser will be the grain yield. Similarly branches per plant and biological yield per plant have positive indirect effect on mash grain yield via pods per plant. It was observed that the direct and indirect effects of remaining predictors are negligible.
Stability and Adaptability Analysis in Sunflower from Eight Locations in Pakistan
A. Ghafoor,I.A. Arshad,F. Muhammad
Journal of Applied Sciences , 2005,
Abstract: Stability of fifteen selected sunflower genotypes across eight environments (locations) in Pakistan with respect to oil yield was tested. On the basis of six different stability measures, genotypes such as SF-187, SMH-269, SC-110 and PSH-21 were found as stable genotypes with respect to oil yield (kg ha-1). Further to group the genotypes having similar response pattern over all environments and to group similar environments over all sunflower genotypes, Ward`s fusion strategy of hierarchical clustering technique was used on sunflower genotypes x environments (G x E) data. It was observed that genotypes SMH-32 and SMH-112 are different from remaining genotypes over all environments, but in the largest group-7 genotypes, Hysun-33, SF-270 and SMH-269 have similar response pattern (w.r.t. oil yield) over all environments. Similarly, it was observed that among eight environments, NARC and Sariab were similar, Kot. Diji and Dunya Pur were similar, Tando Jam and Faisalabad were similar and D.I.K. and Tarnab were found similar with respect to oil yield in sunflower over all genotypes. Performance plots used to illustrate each genotype group`s performance (w.r.t. oil yield) in a series of environment groups. The results showed that genotypes group-1 (Hysun-341 and NK-265) and genotypes group-2 (SF-187 and NK-277) consistently performed well over Kot Diji, Dunya Pur, Tando Jam and Faisalabad environments. Genotype SMH-32 was found to be better in performance at NARC and Sariab.
Use of Plant Growth Regulators (PGRs) in Enhancing Crop Productivity I: Effect of CaC2 as a Source of Ethylene on Some Agronomic Parameters of Wheat (Triticum aestivum L.)
Z. Ahmad,F. Azam,T. Mahmood,M. Arshad
Journal of Agronomy , 2004,
Abstract: A pot experiment was conducted in the greenhouse to evaluate the effect of calcium carbide (as a source of ethylene) on some agronomic parameters of wheat (Triticum aestivum L., var. Inqalab-91) that was grown without or with two levels of N, P and K fertilizers (120-90-60 kg ha-1 and 60-45-30 kg ha-1). Half dose of N and full dose of P and K was applied at sowing while remaining half after one week of germination. Calcium carbide as a source of ethylene was applied at 60 kg ha-1 after 2 and 8 weeks of germination. A factorial completely randomized design was followed with nine treatments each with three replicates. Data regarding plant height, number of tillers, length of spike, number of spikelets spike-1 and grain yield was recorded. Plant height, number of tillers and spike length were significantly affected when CaC2 was applied after one week of germination while number of spikelets and grain yield was maximum when CaC2 was applied after 8 weeks of germination
Anomalous Defects and Their Quantized Transverse Conductivities
A. P. Balachandran,V. John,Arshad Momen,F. Moraes
Physics , 1996, DOI: 10.1142/S0217751X98000378
Abstract: Using a description of defects in solids in terms of three-dimensional gravity, we study the propagation of electrons in the background of disclinations and screw dislocations. We study the situations where there are bound states that are effectively localized on the defect and hence can be described in terms of an effective 1+1 dimensional field theory for the low energy excitations. In the case of screw dislocations, we find that these excitations are chiral and can be described by an effective field theory of chiral fermions. Fermions of both chirality occur even for a given direction of the magnetic field. The ``net'' chirality of the system however is not always the same for a given direction of the magnetic field, but changes from one sign of the chirality through zero to the other sign as the Fermi momentum or the magnitude of the magnetic flux is varied. On coupling to an external electromagnetic field, the latter becomes anomalous, and predicts novel conduction properties for these materials.
Impact of Urban Land Transformation on Water Bodies in Srinagar City, India  [PDF]
Shahab Fazal, Arshad Amin
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.22016
Abstract: Human actions rather than natural forces are the source of most contemporary changes in the state and flows of the biosphere. Understanding these actions and the social forces that drive them is crucial to understanding, modelling and predicting local, regional as well as global environmental change and also for managing and responding to such change. The present study investigates the patterns of urban land transformation in Srinagar City, which lies in fragile hill eco-system of Kashmir valley. The results points towards unplanned and haphazard urban expansion and transformation. These transformations have severely destroyed the water bodies both in terms of area as well as its quality.
Land Transformation Analysis Using Remote Sensing and GIS Techniques (A Case Study)  [PDF]
Arshad Amin, Shahab Fazal
Journal of Geographic Information System (JGIS) , 2012, DOI: 10.4236/jgis.2012.43027
Abstract: The increasing population and economic activities are putting pressure on the available land resources. Human population and their use of land have transformed the terrestrial biosphere into anthropogenic biomes (anthromes). The present study analyses the urban land use/cover change and land transformation in Srinagar city which is located in the valley of the hill state of Jammu and Kashmir. A change detection analysis was performed to determine the nature, extent and rate of land use/cover change and transformation over 30 years of time period. The results show that the city has expanded significantly at the cost of non built-up land which has decreased in its area. Significantly there was not only the expansion of city area but also there were interchange of land between different land use/cover classes in the study area.
Mechanical and Thermal Properties of Chemically Modified Epoxy Resin  [PDF]
Sumeera Ikram, Arshad Munir
Open Journal of Synthesis Theory and Applications (OJSTA) , 2012, DOI: 10.4236/ojsta.2012.13007
Abstract: Diglycidyl ether of bisphenol-A (DGEBA), having number average molecular weight (Mn) 375, was modified by incorporating the hydroxyl terminated polybutadiene (HTPB) based prepolymer using isophorone diisocyanate as a coupling agent. To increase the compatibility between the epoxy resin and HTPB part, polar groups were introduced in the later to achieve physical and chemical interactions between the two phases. The finally modified DGEBA system was cured with amine based hardener. FTIR and 1H-NMR were used to monitor the whole modification procedure. The rubber particles size and distribution was monitored as a function of HTPB contents in the resin system using scanning electron microscopy (SEM). The mechanical, thermal and thermo-mechanical properties have shown that the tensile strength, toughness, ductility and impact strength of the modified cured system have been successfully increased at some optimum HTPB contents without affecting the inherent thermal and thermo-mechanical stability associated with DGEBA resin system. Some of the mechanical properties like flexural modulus, tensile modulus and compressive strength decreased with increasing rubber contents.
Evaluating Urban Landscape Dynamics over Srinagar City and Its Environs  [PDF]
Arshad Amin, Shahab Fazal
Journal of Geographic Information System (JGIS) , 2015, DOI: 10.4236/jgis.2015.72018
Abstract: Rapid, unplanned and uncontrolled urbanization causes disorganized growth. The patterns of urban development are changing natural landscapes and their dynamics. This has necessitated understanding of spatial patterns of urbanization and prompted research. Urbanization being a dynamic phenomenon has been facing ambiguities regarding methods to study its dynamism. It has made operational, a wide-variety of spatial metrics methods utilizing multiple dates of remotely sensed data. The present work carries out the quantitative and qualitative analysis of urban growth of Srinagar by using Urban Landscape Analysis Tool (ULAT). Urbanized Area (UA), Urban Footprint (UF) and New Development (ND) maps are generated to quantify the degree of urbanization based on spatial density of built-up area. Comparative analysis of these maps in relation to the built-up spread pattern indicates that mostly the environs of the Srinagar city which includes mostly agricultural, vacant and marshy areas prominently in northern, western and southern areas contribute to the development of the city.
Analyzing History Quality for Routing Purposes in Opportunistic Network Using Max-Flow  [PDF]
Muhammad Arshad Islam, Marcel Waldvogel
Wireless Engineering and Technology (WET) , 2012, DOI: 10.4236/wet.2012.33020
Abstract: Most of the existing opportunistic network routing protocols are based on some type of utility function that is directly or indirectly dependent on the past behavior of devices. The past behavior or history of a device is usually referred to as contacts that the device had in the past. Whatever may be the metric of history, most of these routing protocols work on the realistic premise that node mobility is not truly random. In contrast, there are several oracles based methods where such oracles assist these methods to gain access to information that is unrealistic in the real world. Although, such oracles are unrealistic, they can help to understand the nature and behavior of underlying networks. In this paper, we have analyzed the gap between these two extremes. We have performed max-flow computations on three different opportunistic networks and then compared the results by performing max-flow computations on history generated by the respective networks. We have found that the correctness of the history based prediction of history is dependent on the dense nature of the underlying network. Moreover, the history based prediction can deliver correct paths but cannot guarantee their absolute reliability.
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