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Search Results: 1 - 10 of 5206 matches for " Hafeez ur Rahman "
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Trends and Overview Regarding the Involvement of Micro-Grids in Modern Power Systems  [PDF]
Muhammad Ali, Hafeez ur Rahman, Waheed ur Rahman, Haseeb ur Rahman
Smart Grid and Renewable Energy (SGRE) , 2012, DOI: 10.4236/sgre.2012.32012
Abstract: Customer satisfaction and participation in utility supply packages is the first and foremost factor in the success of any supplying agency whether wholesale or retail dealer. The paper presents the concept of major prospects of non- autonomous micro-grids installed in a certain locality. The article shows the basic background that is required for the installment of micro grid in a particular area and discusses the primary factors or pre-requisites that are required for the existence and operation of micro-grids. It elaborate the major profitable applications and benefits that developing and developed states get by using micro-grids in an area where utility grid is already functioning .It also explains the basic improvement in the quality of supply from micro grid after its installment. It also throws light on afterwards impact on society with this system, such impacts include reliability, tariff rates, economics etc. The article discusses micro-grids as the future of modern power systems. This paper shows significance of modernization by latest topologies in power systems and its effect that will come afterwards.
WIMAX Implementation of Smart Grid Wide Area Power System Load Protection Model in MATLAB/SIMULINK  [PDF]
Asadullah Khan, Muhammad Ali, Ishtiaq Ahmad, Amjad Ullah, Haseeb Ur Rahman, Hafeez Ur Rahman
Smart Grid and Renewable Energy (SGRE) , 2012, DOI: 10.4236/sgre.2012.34039
Abstract: As the revolutionary change in electric power industry begins with the latest communication infrastructure, it is on the verge of a revolutionary transformation to develop a smart grid to meet the requirements of our digital society. Wide Area Power System is made up of plentiful automated transmission and distribution systems with strong communication infrastructure, all operating in a coordinated, proficient and reliable mode. This paper is fretful with the wide area power system load protection scheme and ensuing design requirement that enhances stability as well as control. It discusses the architecture that upgrades the existing scheme by controlling all the control signals traffic between generating units, server, connected loads, and protection devices using WIMAX. The main theme of the paper is on the use of information technology to obtain more flexibility and smartness in the Wide Area Power System Load Protection by designing the Communication channel using WIMAX. Faults detected in Local area networks and Information regarding the faults of Local Areas is communicated to Load Area Manager (LAM) which takes required control action to handle it. Finally the paper shows islanding operation through WAM for the areas that becomes intensive faulty. Results have been verified in MATLAB/ SIMULIMK.
Environmental interaction, additive and non-additive genetic variability is involved in the expression of tissue and whole-plant heat tolerance in upland cotton (Gossypium hirsutum. L)
Hafeez-ur-Rahman,;
Genetics and Molecular Biology , 2006, DOI: 10.1590/S1415-47572006000300022
Abstract: heat tolerance is measured at tissue level by cellular membrane thermostability (cmt) and at the whole plant level by the heat tolerance index (hti). eight upland cotton cultivars and 15 crosses were used to determine the type and extent of genetic variability associated with the expression of these traits between and within environments. heat stress and non-stress conditions were used as the cmt environments and years for hti. the wide variation in heterotic expression and combining ability effects observed for cmt and hti suggest multigenic inheritance of these traits. significant genetic variability across environments was evident but the traits were not highly heritable because of substantial environmental interaction. the available genetic variability included both additive and non-additive components, but the proportion of additive genetic variability was high for hti. the parental cultivars cris-19 and cim-448 were good donor parents for high cmt under heat-stressed conditions, and mnh-552 and n-karishma under non-stressed conditions. cultivar fh-634 was a good donor parent for hti. the results show two types of general combining ability (gca) inheritance among high cmt parents: positive gca inheritance expressed by cris-19 in the presence of heat stress and mnh-552 and n-karishma in the absence of heat stress; and negative gca inheritance expressed by fh-900 in the presence of heat stress. it was also evident that genes controlling high cmt in cultivar cris-19 were different from those present in the mnh-552, n-karishma and fh-900 cultivars. similarly, among high hti parents, fh-634 showed positive and cim-443 negative gca inheritance. no significant relationship due to genetic causes existed between tissue and whole plant heat tolerance, diminishing the likelihood of simultaneous improvement and selection of the two traits.
Screening of some sunflower (Helianthus annuus Linnaeus compositae) Genotypes against insect pests
Muhammad Aslam,Hafeez-ur-Rahman
Pakistan Journal of Biological Sciences , 2000,
Abstract: Six different genotypes of sunflower (Helianthus annuus L) were screened against Aphids (Aphis gossypii) whitefly (Bemisia tabaci) leaf miner (Plytomyza atricornis) Green leaf hoppers (Empoasca spp.) Painted bugs (Bagrada spp.), and sunflower seed weevil (Smicronys spp) at, early growing and anthesis stages. The results concluded that SMH-9707 was found partially resistant against aphids, whereas Sf-187 was found less susceptible against leaf miner and resistant against whitefly. Suncross-24 was found highly susceptible against painted bug among all the six genotypes of sunflower. SF-187, Parsun-1 and suncross -24 were partially resistant against green leaf hoppers. SMH -9707 was found highly susceptible against sunflower seed weevil and SF-187 was found partially resistant.
Advancement in Wide Area Monitoring Protection and Control Using PMU’s Model in MATLAB/SIMULINK  [PDF]
Waheed Ur Rahman, Muhammad Ali, Amjad Ullah, Hafeez Ur Rahman, Majid Iqbal, Haseeb Ahmad, Adnan Zeb, Zeeshan Ali, M. Ahsan Shahzad, Beenish Taj
Smart Grid and Renewable Energy (SGRE) , 2012, DOI: 10.4236/sgre.2012.34040
Abstract: A big step forward to improve power system monitoring and performance, continued load growth without a corresponding increase in transmission resources has resulted in reduced operational margins for many power systems worldwide and has led to operation of power systems closer to their stability limits and to power exchange in new patterns. These issues, as well as the on-going worldwide trend towards deregulation of the entire industry on the one hand and the increased need for accurate and better network monitoring on the other hand, force power utilities exposed to this pressure to demand new solutions for wide area monitoring, protection and control. Wide-area monitoring, protection, and control require communicating the specific-node information to a remote station but all information should be time synchronized so that to neutralize the time difference between information. It gives a complete simultaneous snap shot of the power system. The conventional system is not able to satisfy the time-synchronized requirement of power system. Phasor Measurement Unit (PMU) is enabler of time-synchronized measurement, it communicate the synchronized local information to remote station.
FEDRP Based Model Implementation of Intelligent Energy Management Scheme for a Residential Community in Smart Grids Network  [PDF]
Qamar Zia, Muhammad Ali, Zulfikar Ahmad Zaidi, Chaudhry Arshad, Amjad Ullah, Hafeez ur Rahman, Muhammad Ahsan Shahzad, Beenish Taj
Smart Grid and Renewable Energy (SGRE) , 2012, DOI: 10.4236/sgre.2012.34045
Abstract: In the framework of liberalized deregulated electricity market, dynamic competitive environment exists between wholesale and retail dealers for energy supplying and management. Smart Grids topology in form of energy management has forced power supplying agencies to become globally competitive. Demand Response (DR) Programs in context with smart energy network have influenced prosumers and consumers towards it. In this paper Fair Emergency Demand Response Program (FEDRP) is integrated for managing the loads intelligently by using the platform of Smart Grids for Residential Setup. The paper also provides detailed modeling and analysis of respective demands of residential consumers in relation with economic load model for FEDRP. Due to increased customer’s partaking in this program the load on the utility is reduced and managed intelligently during emergency hours by providing fair and attractive incentives to residential clients, thus shifting peak load to off peak hours. The numerical and graphical results are matched for intelligent energy management scenario.
Growth and yield of Kinnow (Citrus reticulata Blanco) and soil physical properties as affected by orchard floor management practices in Punjab, Pakistan
Hafeez-ur-Rahman,Ghulam Nabi, Ijaz Ali,Tauseef Tahir and Mukhtar Ahmed
Soil & Environment , 2012,
Abstract: Improvement of soil physical properties through orchard floor management is a desired option because it results in improved yields, better nutrients and water use efficiency and reduced runoff. Studies were carried out to determine effect of weed management practices on growth, fruit production and changes in soil physico-chemical parameters in a citrus orchard. Studies comprised of two orchard floor management practices i.e. cultivation and mowing. In cultivation, weeds emerging in the orchard were controlled by cultivation/ploughing to keep their growth at minimal, while in mowing, weeds were cut at about 5 cm height to keep their growth under check and the cut weeds to act as mulch. After 8 years of continuous practice, determinations were made to compare effectiveness of the management practices in terms of plant growth and yield, changes in soil physico-chemical and water retention characteristics. The data indicated that all the growth parameters responded significantly to management practices. Similarly, soil physico-chemical parameters were also affected. Shoot growth, canopy diameter, Trunk Cross-sectional Area (TCSA) and fruit yield were increased. Soil bulk density was decreased and consequently soil porosity was increased. Mowing promoted accumulation of soil organic matter and soil aggregation. The increased water retention in soil profile and enhanced saturated hydraulic conductivity were attributed to conditions conducive to organic matter accumulation in the soil profile. The results indicated superiority of mowing practice over conventional cultivation towards plant growth, yield and improvement in soil physical properties.
Ethanol Production Kinetics by a Thermo-Tolerant Mutant of Saccharomyces Cerevisiae from Starch Industry Waste (Hydrol)
Farman Ali Shah,Shaheen Aziz,Hafeez ur Rahman Memon,M.I. Rajoka
Pakistan Journal of Analytical and Environmental Chemistry , 2010,
Abstract: A thermo-tolerant and deoxyglucose-resistant mutant of Saccharomyces cerevisiae was developed and employed to convert them to fuel ethanol in a 150 litre fermenter. Maximum ethanol production was achieved when fermentation of dextrozyme- treated hydrol was carried out for about 36 hours under optimized fermenting conditions. The maximum specific ethanol production rate (qP), and overall ethanol yield (YP/S) were found to be 2.82 g L-1 h-1 and 0.49 g/g respectively. Determination of activation energy for cell growth (Ea= 20.8 kJ/mol) and death (Ed = 19.1 kJ/mol) and product formation and inactivation (EP=35.8 kJ/mol and Edp = 33.5 kJ/mol) revealed the thermo-stability of the organism for up to 47°C.
Induction of Salt Tolerance in Rice Through Mutation Breeding
Abdul Wahid Baloch,Ali Mohammed Soomro,Mohammed Aslam Javed,Hafeez-ur-Rahman Bughio
Asian Journal of Plant Sciences , 2003,
Abstract: One mutant variety Shua-92 and two mutants of rice, derived through mutation breeding from the two standard varieties IR8 and Pokkali, were evaluated for two years for their yield performance in salt affected soils with pH 7.63 to 7.68 and EC 7.11 to 8.0 dSm-1. The mutant variety Shua-92 produced 40 and 49% higher paddy yield on salt affected soils than the famous salt tolerant varieties Nona Bokra and Pokkali.
Apple Economy of Village Zandra in Light of World System Theory  [PDF]
Anwaar Mohyuddin, Hafeez-Ur-Rehman Chaudhry, Mamonah Ambreen
Open Journal of Applied Sciences (OJAppS) , 2013, DOI: 10.4236/ojapps.2013.31006
Abstract:

This paper deals with research findings regarding horticulture, a major sources of income in the Village Zandra, District Ziarat in the province of Balochistan. Initially the natives were earning their livelihood through horticulture only. The main contribution was coming through apple production. The process of tree plantation and the people involved in horticulture economy have been discussed in this article. During the last 3 decades few changes have been witnessed. Shift from subsistence to market economy has increased the lust for money due to which the natives have started opting for secondary sources of income. In horticulture they have started using technology, pesticides and chemical fertilizers to maximize their production and profit. They are also switching over to the cultivation of profitable types of apple. The impact of these changes has been analyzed in light of world system theory at micro level. The data presented in this paper have been collected by using qualitative anthropological research techniques.

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