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Search Results: 1 - 10 of 407881 matches for " M. M. Ahmad "
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Study of Duct Characteristics Deduced from Low Latitude Ground Observations of Day-Time Whistler at Jammu  [PDF]
M. Altaf, M. M. Ahmad
International Journal of Astronomy and Astrophysics (IJAA) , 2013, DOI: 10.4236/ijaa.2013.33032

Propagation characteristics of low latitude whistler duct characteristics have been investigated based on day-time measurements at Jammu. The morphogical characteristics of low latitude whistlers are discussed and compared with characteristics of middle and high latitude whistlers. The Max. electron density (Nm) at the height of the ionosphere obtained from whistler dispersion comes out to be higher than that of the background which is in accordance with the characteristics of whistler duct. The equivalent width is found to be close to the satellite observations and the characteristics of whistler duct in low latitude ionosphere are similar to those in middle and high latitude ionosphere. The width of ducts estimated from the diffuseness of the whistler track observed during magnetic storm is found to lie in the range of 50 - 200 Km.

On k(D)-Blocks  [PDF]
Ahmad M. Alghamdi
Advances in Pure Mathematics (APM) , 2015, DOI: 10.4236/apm.2015.54018
Abstract: The objective of this research paper is to study numerical relationships between a block of a finite group and a defect group of such block. We define a new notion which is called a strongly k(D)- block and give a necessary and sufficient condition of a block with a cyclic defect group to be a k(D) -block in term of its inertial index. We believe that the notion and the results in this work will contribute to the developments of the theory of blocks of finite groups.
Charge Fluctuations in pp and AA Collisions at RHIC and LHC Energies  [PDF]
Shakeel Ahmad, M. Zafar, M. Irfan, A. Ahmad
World Journal of Nuclear Science and Technology (WJNST) , 2012, DOI: 10.4236/wjnst.2012.24031
Abstract: Various measures of event-by-event net charge and charge ratio fluctuations in pp and AA collisions at RHIC and LHC energies are studied using the different Monte Carlo generators: URQMD, HIJING and HIJING/ and the results are compared with the predictions for the independent emission, hadron gas and QGP phase. Values of the D-measures are observed to exhibit significant energy dependence for both pp and AA data. Furthermore, there is essentially no significant difference in the values of the D-measures predicted by the various Monte Carlo codes used in the present study. A slight centrality dependence of the D-measures in terms of net charge fluctuations is observed in the case of Au-Au data at 200A GeV/c. These findings, thus, suggest that a difference in the D-measures for pp and AA collisions either the re-scattering effect plays a predominant role or there might be some new physics present in these collisions.
Role of Platelet Rich Plasma in Treatment of Diabetic Foot Ulcers  [PDF]
Aymen Salem, Ahmad M. Tawfik
Surgical Science (SS) , 2016, DOI: 10.4236/ss.2016.76038
Abstract: Objectives: The aim of this study is to compare between the platelet rich plasma and balanced moist dressing as regards the healing rate in chronic non ischemic diabetic foot ulcers. Patients and Method: From Feb. 2014 till May 2015, 73 patients from the attendees to Zagazig university hospitals were selected to our study. 2 groups were created, one for PRP (platelet rich plasma) and the other for balanced moist dressing. Frequent registration for the number of healed ulcers was done every week. Results: By the end of the 3rd week almost all the ulcers in the PRP group were healed. But the other group needed about 8th weeks for the same results. Conclusion: PRP seems to be an attractive choice in management of chronic diabetic ulcers provided that there is good blood supply and proper offloading was done.
Control of Instable Chaotic Small Power System  [PDF]
Samir M. Al Shariff, Ahmad M. Harb
Journal of Power and Energy Engineering (JPEE) , 2015, DOI: 10.4236/jpee.2015.32001
Abstract: In this paper, we aim to control an instable chaotic oscillation in power system that is considered to be small system by using a linear state feedback controller. First we will analyze the stability of the mentioned power system by means of modern nonlinear theory (Bifurcation and Chaos). Our model is based on a three bus power system that consists of multi generators containing both dynamic and static loads. They are considered to be in the form of an induction motor in parallel with a capacitor, as well as a combination of constant power along with load impedance, PQ. We consider the load reactive power as the control parameter. At this stage, after changing the control parameter, the study showed that the system is experiencing a subcritical Hopf bifurcation point. This leads to a chaos within the system period doubling path. We then discuss the system controllability and present that the all chaotic oscillations fade away through the linear controller that we impose on the system.
Abacavir-induced reversible Fanconi syndrome with nephrogenic diabetes insipidus in a patient with acquired immunodeficiency syndrome
Ahmad M
Journal of Postgraduate Medicine , 2006,
Abstract: There are several reports of Fanconi syndrome (FS) with or without nephrogenic diabetes insipidus (NDI) in patients with human immunodeficiency virus (HIV) infection, treated with various antiretroviral medications like cidofovir, adefovir, didenosine and tenofovir. But neither FS nor NDI has been documented with abacavir therapy. We are reporting the first case of abacavir-induced reversible FS with NDI in a patient with acquired immunodeficiency syndrome, who recovered completely with supportive treatment and discontinuation of abacavir.
Estimated breeding values and genetic trend for milk yield in Nili Ravi buffaloes
M. Ahmad
Italian Journal of Animal Science , 2010, DOI: 10.4081/ijas.2007.s2.393
Abstract: Data on 263 pedigrees, breeding and performance records of 98 Nili-Ravi Buffaloes maintained at Livestock Experiment Station, Bahadurnagar, Okara, Punjab, Pakistan during the period 1991 to 2002 were utilized in this study to identify the high yielding elite buffaloes/bull mothers (dams) to retain for further breeding for the on going progeny testing program in the country. The lactation records up to 6th parity were used for the analysis. The data were analyzed through Best Linear Unbiased Predictions (BLUP) procedure. The breeding values were estimated by using Restricted Maximum Likelihood (REML) procedure fitting Individual Animal Model. The least squares mean for lactation milk yield was 2462.92 ± 195.93 kg. The average lactation length was 340.57 ± 61.70 days. Out of 98 buffaloes, 48 had positive breeding values (EBVs+). Within these 48 buffaloes (EBVs+), 16 were declared as elite buffaloes. The estimated breeding values for milk yield from animal model evaluations ranged from –922 to +2954 kg. The over all genetic trend for milk yield was found positive.
Modeling of Diffuse Solar Radiation and Impact of Complex Terrain over Pakistan Using RS/GIS  [PDF]
Shahzad Sultan, Renguang Wu, Iftikhar Ahmad, M. Fahim Ahmad
Journal of Geographic Information System (JGIS) , 2014, DOI: 10.4236/jgis.2014.64035

Diffuse solar radiation is subject to the combined influence of ground and sky factors, such as topography, geography of the area and cloud cover. This study attempts to quantify the impacts of topography, sky factors and the cloud cover on the distribution of diffuse solar radiation over Pakistan. Distributed modeling approach by considering anisotropy scattering mechanism was adopted. Digital elevation model and observed data are used to derive average monthly diffuse solar radiation values over the rugged terrains of Pakistan. Extraterrestrial solar radiation model, sky view factor model (openness model) and digital elevation model (DEM) are applied to investigate the impacts of ground factors, while diffuse solar radiation model for horizontal surface was considered for sky factors. Furthermore, corrected MODIS cloud fraction data are incorporated using GIS plat form. Results show that the highest amount of diffused solar radiation occurs during the monsoon months along the eastern side of the River Indus, when the sky is covered by clouds of various heights and densities. The variation due to topography is evident in mountainous areas, particularly in the North Pakistan and over the Baluchistan Plateau.

Studies on the occurrence, clinical features and clinico pathological aspects of theileriosis in buffaloes
A. Ahmad,M. Ahmad,R. Ahmad
Italian Journal of Animal Science , 2010, DOI: 10.4081/ijas.2007.s2.932
Abstract: Forty six (46) clinical cases of lethal theileriosis in buffaloes around Livestock Production Research Institute, Bahadurnagar (Okara) were identified microscopically using field’s stained blood smears. Clinical features of the disease were manifested by high rise of body temperature 104.8 ± 1.2, enlarged lymph nodes at parotid, inability to walk, anorexia, listlessness, moderate anaemia and in few cases cornial opacity. There were marked decline (P<0.01) in the Haemoglobin (Hb) 8.28 ± 1.81 gm/dl, Total Erythrocytic Count (TEC) 4.14 ± 0.7x106 /ul, Packed Cell Volume (PCV) 22.10 ± 0.8 percent and Total Leukocytic Count (TLC) 4.95 ± 1.05x 103 /ml, respectively. Erythrocytic Sedimentation Rate (ESR) was significantly increased (P<0.01) up to 103.5 ± 12.4 mm/Ist hour. The percentage of Neutrophils increased 61.75 ± 2.77 and Lymphocytes decreased drastically 28.69 ± 1.45 as compared with un-infected buffaloes. Buparvaquone (Butalex) was found drug of choice and buffaloes recovered from the disease due to early diagnosis and treatment. Necropsy findings revealed excessive fluid in the peritoneal and pleural cavity. Haemorrhagic ulcerations of abomasums and necrotic spots on the serosal surface of the small intestine were noticed.
Retinal vasculature enhancement using independent component analysis  [PDF]
Ahmad Fadzil M. Hani, Hanung Adi Nugroho
Journal of Biomedical Science and Engineering (JBiSE) , 2009, DOI: 10.4236/jbise.2009.27079
Abstract: Retinal vasculature is a network of vessels in the retinal layer. In ophthalmology, information of retinal vasculature in analyzing fundus images is important for early detection of diseases related to the retina, e.g. diabetic retinopathy. However, in fundus images the contrast between retinal vasculature and the background is very low. As a result, analyzing or visualizing tiny retinal vasculature is difficult. There-fore, enhancement of retinal vasculature in digital fundus image is important to provide better visualization of retinal blood vessels as well as to increase accuracy of retinal vasculature segmentation. Fluorescein angiogram overcomes this imaging problem but it is an invasive procedure that leads to other physiological problems. In this research work, the low contrast problem of retinal fundus images ob-tained from fundus camera is addressed. We develop a fundus image model based on probability distribution function of melanin, haemoglobin and macular pigment to represent melanin, retinal vasculature and macular region, respectively. We determine retinal pigments makeup, namely macular pigment, melanin and haemoglobin using independent component analysis. Independent component image due to haemoglobin obtained is used since it exhibits higher contrast retinal vasculature. Contrast of reti-nal vasculature from independent component image due to haemoglobin is compared to those from other enhancement methods. Results show that this approach outperforms other non-invasive enhancement methods, such as contrast stretching, histogram equalization and CLAHE and can be beneficial for retinal vasculature segmentation. Contrast enhancement factor up to 2.62 for a digital retinal fundus image model is achieved. This improvement in contrast reduces the need of applying contrasting agent on patients.
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