Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2019 ( 14 )

2018 ( 101 )

2017 ( 89 )

2016 ( 112 )

Custom range...

Search Results: 1 - 10 of 7208 matches for " Muhammad Abid "
All listed articles are free for downloading (OA Articles)
Page 1 /7208
Display every page Item
Turbulent Flow Simulations through Tarbela Dam  [PDF]
Muhammad Abid, Adnan Aslam Noon
Engineering (ENG) , 2010, DOI: 10.4236/eng.2010.27067
Abstract: Tarbela dam is one of the largest earth filled dam in the world. The sediments inflow in the Tarbela reservoir has resulted in reduction in water storage capacity. In addition damage to the tunnels, power generating units and ultimately to the plant equipment by the sediments particles carried by water is observed. To the authors knowledge, to-date no comprehensive simulation studies are performed for this dam reservoir and tunnels, especially at present when sediment delta and presence of sediment particles in the tunnels is observed to a reasonable extent. The aim of this study is to investigate the damage to the Tunnel 2 of the Tarbela Dam with and without considering the affect of sediment particles for one way and two way/full coupling during summer, winter and average seasons, using turbulent flows of water. Numerically calculated erosion results are compared with the experimental erosion results. Pressure, velocity and erosion rate density results are discussed in detail.
Multiphase Flow Simulations through Tarbela Dam Spillways and Tunnels  [PDF]
Muhammad Abid, Muftooh Ur Rehman Siddiqi
Journal of Water Resource and Protection (JWARP) , 2010, DOI: 10.4236/jwarp.2010.26060
Abstract: Tarbela dam is one of the largest earth filled dam in the world used for power generation and irrigation purposes. Like all reservoirs the sediments inflow in the Tarbela reservoir has resulted in reduction in water storage capacity and is also causing damage to the tunnels, power generating units and ultimately to the plant equipment. This numerical study was performed to predict the flow patterns and characteristics in Tarbela dam. Tunnel 3 and 4 inlets; originally on the bed level were raised in the 3-D model and meshed. Analysis was performed using multiphase flow (water and air) for maximum inflow in the reservoir, i.e., considering summer season and discharging water through different locations, i.e., tunnels and spillways. Pressure, velocities, flow rate and free surface height results obtained were found in good agreement with the analytical and existing results where available. Results show uneven discharge through each gate due to maximum velocity near exits and overall stagnant phenomena of water within the reservoir. Maximum velocity was observed along the spillways outlet. Strong vortex motion was observed near the spillways outlet and tunnel inlets. New design of Tunnel 3 and 4 were suggested to WAPDA in order to decrease the sediment inflow and improvements in design of the spillways were suggested.
The Professional Medical Journal , 2011,
Abstract: Objectives: To compare open hemorrhoidectomy and Rubber Band Ligation (RBL) in the management of 2nd and 3rd degree hemorrhoids in terms post operative and hospital stay. Design: Experiential Randomized Control Trial. Setting: Department of surgery, Allied Hospital and Independent University Hospital Faisalabad. Period: Dec 2008 to May 2009. Patients & Methods: 100 consecutive patients with second and third degree hemorrhoids were randomly divided into two groups. Group A (50 patients) were operated by open hemorrhoidectomy (Milligan morgan technique) while in group B (50 patients) rubber band ligations was performed. Open hemorrhoidectomy was performed underspinal anesthesia while rubber bands were applied with local xylocaine gel using Barron’s rubber band ligator. All the three hemorrhoids wereligated in single session. Results: Average hospital stay was 24 hours in patient operated by open hemorrhoidectomy as compared to one hour in rubber band ligation. 60% patients in group A developed moderate to severe pain requiring I/V morphine derivatives while 40% developed mild pain and treated with NSAIDS. In group B only 20% patients developed moderate pain and were dealt with I/M diclofenac sodium. Eightyeight percent patients in group A and 60% patients in group B developed mild to moderate bleeding in first postoperative week, which was self limiting. 6 patients developed severe bleeding after hemorrhoidectomy requiring blood transfusion. During six month follow up, two patients (4%) of open hemorrhoidectomy and 3 patients (6%) of RBL presented with recurrence and respective procedures were repeated. Conclusions: Rubber band ligation is safe, quick, economical and effective method for the treatment of 2nd and 3rd degree hemorrhoids.
Measuring the Learning Attitudes of Teaching Staff of Public and Private Colleges in Pakistan
Muhammad Abid Hussain
International Journal of Management and Organizational Studies , 2013,
Abstract: The purpose of this study is to compare the learning attitudes of public and private sectors in Pakistan. To check and compare the learning attitudes of public and private colleges, response from 50 respondents was taken. The questionnaire was taken which was developed by Marsick and Watkins. The null hypothesis (H0) is that the both type of colleges have equal level of learning attitude while H1 opposes our null hypothesis. Mean values were taken for comparison. Results show the extent of learning as higher in private colleges than the public ones.
The Professional Medical Journal , 2004,
Variation in Expression of Sub1 Gene and Association with Submergence Stress Related Traits in Advance Rice (Oryza sativa L.) Genotypes as a Tool of Climate Change Adaptation  [PDF]
Zulqarnain Haider, Muhammad Akhter, Abid Mahmood, Usman Saleem
American Journal of Climate Change (AJCC) , 2018, DOI: 10.4236/ajcc.2018.72012
Abstract: Floods have now become most detrimental natural catastrophe worldwide due to radical climatic fluxes. Therefore, there is a dire necessity to develop a high yielding rice lines to deal with this scenario. For this purpose, a large scale experiment was conducted including one hundred and fifteen (115) rice genotypes having SUB1 gene imported from International Rice Research Institute (IRRI) Philippines, six local cultivars/approved varieties and three high yielding rice varieties i.e. Sabitri, IR6 and NSICRC222 being used as potential varieties in different countries of Asia as susceptible check and IR64-SUB1 as tolerant check. The genotypic screening was performed using two PCR-based DNA markers i.e. ART5 and SC3. Phenotypic screening was conducted in a natural pond to assess the interaction of SUB1 gene in natural stagnant flood water as well as the suitability of introgression of SUB1 gene into approved varieties and elite rice lines. The genotypes were assessed in terms of plant survival percentage, submergence tolerance index, physical condition, stem elongation, number of grains per panicle, thousand grain weight, grain yields and deviations in these traits after submergence stress. The PCR results suggested that both the primers ART5 and SC3 may be used as potential PCR-based markers for molecular screening of rice genotypes for SUB1 QTL. Furthermore, it confirmed the presence of SUB1 gene in all the lines imported from IRRI, while it was absent in all the local cultivars studied. All the genotypes with submergence tolerant gene (SUB1) showed significantly greater tolerance level in submergence stress of 14 days, as compared to other local cultivars/varieties, authenticating the effectiveness of SUB1QTL in conferring submergence tolerance. Significantly different performances of all the SUB1 genotypes in terms of all the studied traits indicate high Genotypic and Genotypic Environment Interaction (GEI) of SUB1QTL. Employment of SUB1 lines such as R105479:149-18, IR64-SUB1 and Rl05469:81-22-3 in breeding programs for developing flood tolerant rice varieties might further upsurge rice yields in flash flood areas. Correlation analysis revealed that plant survival percentage after submergence, reduced stem elongation during submergence and submergence tolerance index are very important traits for developing submergence tolerant lines.
Effect of soil salinity on the performance of some citrus rootstocks at seedling stage
Muhammad Akbar Anjum,Muhammad Abid,Farrukh Naved
Pakistan Journal of Biological Sciences , 2000,
Abstract: As salinity level of the soil was increased (ECe 1.65-8.0 ds m -1) survival percentage, plant height and number of leaves per plant were progressively decreased and toxicity symptoms (tip burning and defoliation) became more pronounced. The performance of Cleopatra mandarin was better at all the ECe levels. Troyer citrange was the most affected rootstock while Red rough lemon, Bitter sweet orange and Volkameriana in the middle.
Performance Analysis of Analog Butterworth Low Pass Filter as Compared to Chebyshev Type-I Filter, Chebyshev Type-II Filter and Elliptical Filter  [PDF]
Wazir Muhammad Laghari, Mohammad Usman Baloch, Muhammad Abid Mengal, Syed Jalal Shah
Circuits and Systems (CS) , 2014, DOI: 10.4236/cs.2014.59023

A signal is the entity that carries information. In the field of communication signal is the time varying quantity or functions of time and they are interrelated by a set of different equations, but some times processing of signal is corrupted due to adding some noise in the information signal and the information signal become noisy. It is very important to get the information from corrupted signal as we use filters. In this paper, Butterworth filter is designed for the signal analysis and also compared with other filters. It has maximally flat response in the pass band otherwise no ripples in the pass band. To meet the specification, 6th order Butterworth filter was chosen because it is flat in the pass band and has no amount of ripples in the stop band.

Maturity of Cotton Cultivars in Multan as Determined by Nodes above White Flower
Muhammad Iqbal,Muhammad Ali Chang,Abid Mahmood,Muhammad Zafar Iqbal
Asian Journal of Plant Sciences , 2003,
Abstract: The node above white flower (NAWF) technique was used to monitor the growth, development and maturity of ten cotton varieties viz. Reshmi, CIM-443, MNH-93, MNH-329, MNH-395, MNH-439, S-12, FH-900, CIM-1100 and NIAB-78 during the years 1997, 1998 and 1999. The NAWF counts were made at weekly intervals. By regressing NAWF means over time, the number of days to reach NAWF of 5.0 (NAWF-5) was determined. Days to NAWF-5 were highly correlated with percent first pick of seed cotton yield. It was observed that NIAB-78 and CIM-443 achieved NAWF-5 earlier by 109.86 and 109.09 days (average of three years). Days to NAWF-5 provided a focal point for all management decisions. Therefore, it became evident that NAWF technique could be used for monitoring cotton plant after flowering, earliness determination of variety/strain and detecting fruiting problems during growth season.
Determinants of Food Acceptance and Micro-Nutrients Deficiency in Preschoolers: A Case Study of Households from Karachi, Pakistan
Zammurud Subzwari,Abid Hasnain,Muhammad Ali
Pakistan Journal of Nutrition , 2009,
Abstract: This study attempts to find out the determinants of food acceptance and micro-nutrient deficiency in preschool children from Karachi, Pakistan. Primary data was collected through survey from 400 households by interviewing and filling up the questionnaire. Index for food acceptance and micro-nutrient deficiency were constructed with the help of related questions from the questionnaire. Econometric models were developed and Logit techniques was employed to estimate probability of end indicator. Our results show that increase Micro-Nutrient Deficiency (MND) may cause lower level of Food Acceptance and vice versa. On the other hand, modeling food acceptance may indicate higher level of MND among preschoolers reduce the acceptance level of appropriate food. Other important variables like Household Income, Mother’s Literacy and Mother’s Maternal Knowledge showed significant effects and appropriate signs of coefficients as per expectations. On the basis of these findings, if government targets the core independent variables that are identified in the analysis, Food Acceptance level can be increased amongst the children and Micro-Nutrient Deficiency could then be reduced. Consequently government intervention, both long term and short term are needed to provide and regulate the food acceptance behavior either at household level or at other form so that our generation could be healthier and more productive which would lead the economic growth of a country which is abundant in labor.
Page 1 /7208
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.