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Search Results: 1 - 10 of 10981 matches for " Amir Khan "
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Cultural Studies and Anthropology
Amir Khan
Anthropoetics : the Journal of Generative Anthropology , 2006,
A Call to Passion
Amir Khan
Anthropoetics : the Journal of Generative Anthropology , 2007,
Some Exact Solutions of Generalized Jeffrey Fluid Using N-Transform  [PDF]
Amir Khan, Gul Zaman, Saeed Ahmad, M. Ikhlaq Chohan
American Journal of Computational Mathematics (AJCM) , 2017, DOI: 10.4236/ajcm.2017.74029
Abstract: In this paper, we presents some new exact solutions corresponding to three unsteady flow problems of a generalized Jeffrey fluid produced by a flat plate between two side walls perpendicular to the plate. The fractional calculus approach is used in the governing equations. The exact solutions are established by means of the Fourier sine transform and N-transform. The series solutions of velocity field and associated shear stress in terms of Fox H-function, satisfying all imposed initial and boundary conditions, have been obtained. The similar solutions for ordinary Jeffrey fluid, performing the same motion, appear as limiting case of the solutions are also obtained. Also, the obtained results are analyzed graphically through various pertinent parameters.
The Oscillatory Motion of Oldroyd-B Fluid by Incorporating Some of the Mechanical Factors  [PDF]
Amir Khan, Gul Zaman, Yongjin Li, Saeed Ahmad, Altaf Hussain
Journal of Applied Mathematics and Physics (JAMP) , 2017, DOI: 10.4236/jamp.2017.512196
Abstract: The aim of this paper is to present a numerical study of oscillatory motion of Oldroyd-B fluid in a uniform magnetic field through a small circular pipe. First, we derive the orientation stress tensor by considering the Brownian force. Then, the orientation stress tensor is incorporated by taking Hookean dumbbells on Brownian configuration fields in the Oldroyd-B model. The Oldroyd-B model is then reformulated coupled with the momentum equation and the total stress tensor. Finally, we analyze the orientation stress tensor in the pipe by the numerical simulations of the model and showed that the effect of orientation stress tensor is considerable although the Brownian force is sufficiently small.
Absolute values of nonstandard interaction parameters in ν_{e}e and ν_{e}e-scatterings
Amir Nawaz Khan,Farida Tahir
Physics , 2011,
Abstract: We present a novel approach for constraining nonstandard neutrino interaction (NSI) coupling parameters ({\epsilon}_{ee}^{eL} and {\epsilon}_{ee}^{eR}) in low energy flavor conserving {\nu}_{e}e and {\nu}_{e}e-scattering processes. Here we exploit an important phenomenon of interference and assuming that {\epsilon}_{ee}^{eL} and {\epsilon}_{ee}^{eR} are same for both the processes as g_{L} and g_{R} in the standard model (SM). Using this approach we obtain the absolute values {\epsilon}_{ee}^{eL}=8.7x10^-3 and {\epsilon}_{ee}^{eR}=3.8x10^-1, while the bounds obtained using the said processes are -0.11<{\epsilon}_{ee}^{eL}<0.13 and 0.35<{\epsilon}_{ee}^{eR}<0.41. It is noteworthy that the lower bound on {\epsilon}_{ee}^{eR} exclude the negative region. Furthermore, our bounds on {\epsilon}_{ee}^{eR} are more stringent than the existing ones.
Vigor Tests Used to Rank Seed Lot Quality and Predict Field Emergence in Wheat
Amir Zaman Khan,Hamayoon Khan,Rozina Khan,Abdul Aziz
American Journal of Plant Physiology , 2007,
Abstract: The objective of the present study was to examine the relationship between various seed quality tests and field emergence of the new and old wheat cultivars. Laboratory and field tests were conducted during 2003 and 2004 in NWFP Agricultural University Peshawar, Pakistan, to investigate the suitability of various Laboratory vigor tests, to rank quality of commercial seed lots and to predict seedling Field Emergence (FE) of thirty-two samples of four wheat varieties. Seeds of four wheat cultivars Takbeer 2000, Haider 2000, Bakhtawar-92 and Fakhri Sarhad were produced in eight different location of NWFP-Pakistan during 2003 and 2004. Mature seeds were harvested, threshed and cleaned before determining standard germination and other vigor tests. Results showed that among all tests, Germination Index (GI), Accelerated Aging (AA) and Electrical Conductivity (EC) provided the best estimate of seed vigor for the four wheat cultivars, both for ranking seed lots quality and predicting field emergence. The GI, AA and EC tests better indicated seed lot quality and predicted FE than SG of the four cultivars over the 2 years followed by Radical Length (RL). The Electrical Conductivity (EC) result was not only poorly related to FE, but also poorly related to the Standard Germination (SG) of a wide range of seed lots of the four varieties that varied in viability. Initial count of Standard Germination (SGi) generally performed more poorly than the other vigor tests. From this study and previous work on wheat crop, we conclude that GI, AA and EC test for wheat crop have the potential to be developed as improved vigor tests for ranking seed lot quality and predicting seeding performance under temperate regions of the world.
Seed Developmental Profile of Soybean as Influenced by Planting Date and Cultivar under Temperate Environment
Amir Zaman Khan,H. Khan,R. Khan,Adel Ghoneim
American Journal of Plant Physiology , 2007,
Abstract: The aim of present study were to characterize the pattern of seed development in precociously mature soybean seeds planted on different dates during its progression from germination to seedling growth and maturation and its effect on yield under temperate environment. Changes in seed quality (Viability and Germination) were monitored from developmental to maturation (growth stage R5 to R7) of soybean (Glycine max (L.) Merr.) in different planting dates. Information on the effect of planting date on seed fresh and dry weight, moisture content and germination of soybean is meager. A field experiment was conducted with four planting dates and two soybean cultivars to study the influence of planting dates on seed developmental traits for 2 years. Determinate cultivars (Epps, maturity group [MG] V) and indeterminate cultivar, Williams 82 [MG] 111) were planted on May 1st to August 1st at one month interval at the Agriculture Research Farm of the NWFP Agricultural University Peshawar, during 2000 and 2001. Seeds were harvested at 10-days interval from 35 to 75 days after anthesis (DAA) in all planting dates. Epps planted in early May gave maximum fresh, dry seed weight and moisture content. A steady decrease in fresh and dry weight and moisture content were observed with delay in sowing of soybean. An inverse relationship was noted in Williams 82 regarding fresh, dry weight and moisture content in all planting dates. Water per seed increased up to 100% DAA, after which no further increase occurred. Moisture content declined for the whole seed, respectively, from above 75 and 65% at 95 DAA to 65 and 50% at 140 DAA in both cultivars. Decrease in seed moisture content during development was accompanied by increase in desiccation tolerance and germination, reaching maximum at physiological maturity in both cultivars. Fresh and dry seed germination increased linearly in both varieties. Mean rate of change in germination was more pronounce in Epps as compared to Williams 82. Immature seeds in both cultivars during early developmental stage did not germinate in all planting dates.
Physio-chemical Qualities of Wheat Varieties as Influenced by Nitrogen and Sulfur Fertilization
Beena Saeed,Amir Zaman Khan,Hasina Gul
Pakistan Journal of Nutrition , 2011,
Abstract: Nitrogen and sulfur supplies have a strong influence on the physio-chemical characteristics of crop as well as on the quality and quantity of wheat storage proteins, which play an important role in bread-making process. In order to evaluate the contribution of soil and foliar fertilization of nitrogen and sulfur on quality assessment of wheat, a field trail was carried out having RCB design with four replications and eight different treatments of N and S combinations allotted to plots at different growth stages. Results indicated that highest gluten content (28.35%) was recorded when the wheat crop was fertilized with treatment number-6. Likewise minimum ash contents (1.83%) and minimum electrical conductivity was observed with fertilization of treatment number-8, while control practice result low gluten contents, low standard germination %age and minimum accelerated aging germination test value. In all the recorded observations concerning the experiment wheat cultivar Pirsabaq-2005 showed appreciable response as compared with other variety. So it is possible to obtain maximum quality assessment traits of wheat grain and flour through soil and foliar application of N and S.
Topping in Wheat: Effect on Green Fodder, Plant Growth and Seed Yield under Rodh Kohi Condition
Rahmat Ullah Khan,A. Amir,G. Sarwer
Pakistan Journal of Biological Sciences , 2003,
Abstract: Field experiment was carried out on wheat crop during 2000-01 to determine the effect of topping in local and improved cv. Inqilab-91 at different stages for fodder and then after re-growth on seed yield. Topping level in wheat at tillering stage significantly produced a maximum green fodder of 13510 kg ha ̄1 followed by wheat topped at 6-8 leaf stage with a fodder of 8750 kg ha ̄1, whereas improved cv. Inqilab-91 gave a maximum green fodder of 8433 kg ha ̄1 and 7750 kg ha ̄1 at said stages. Plant height, spike length and grains spike ̄1 were significantly reduced with topping in both the varieties except tiller plant ̄1. Maturity was delayed 3-5 days in local wheat variety whereas 7-9 days in improved c.v. Inqilab-91 as compared to control (un-cut), respectively. Concerned to seed yield 2-3 fold reduction occurred in local wheat whereas in improved c.v. Inqilab-91, yield did not differ significantly between control (un-cut) and when it was topped at 6-8 leaf stage but 2 fold yield reduced, when it was topped at tillering stage. Although local wheat variety gave maximum green fodder but it yield was severely reduced than improved wheat c.v. Inqilab-91.
The Inverted Double Heterojunction Organic Photovoltaic Devices using Electrospun TiO2 Nanofibers
Muhammad Tanveer,Amir Habib,Muhammad Bilal Khan
International Journal of Soft Computing & Engineering , 2013,
Abstract: The introduction of electrospun TiO2 nanofibershas improved the performance of inverted poly (3-hexylthiophene) (P3HT) and (6, 6)- phenyl-C61- butyric acidmethyl ester (PCBM) solar cells by providing efficient chargegeneration and collection through double heterojunction.Electrospun TiO2 nanofibers increased the charge separation andcollecting capability of the devices both from P3HT and PCBM byproviding interfaces between P3HT-TiO2 and PCBM-TiO2nanofibers. The resulting devices have reached to maximumpower conversion efficiency (PCE) of 4.25±0.03% contributed byincreased short circuit current (Jsc).
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