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Search Results: 1 - 10 of 1190 matches for " Amjad Ullah "
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Exchange Rate Volatility in Pakistan and Its Impact on Selected Macro Economic Variables (1980-2014)  [PDF]
Madeeha Zamir, Amjad Amin, Sami Ullah, Salim Ullah Khan
iBusiness (IB) , 2017, DOI: 10.4236/ib.2017.94012
Abstract: Among the developing countries, Pakistan experienced a unique downward trend in rupee value and frequent transitions in the exchange rate systems. These distinctive features make Pakistan economy an interesting case study for the empirical examination of the rupee exchange rate and its role in the monetary policy and macroeconomic performance. The purpose of the present study is to find out which of the macroeconomic indicators has led the Pak-rupee exchange rate volatility during the study period. Furthermore, the effect of the exchange rate volatility on foreign exchange reserves and selected macroeconomic variables has also been studied in the framework of a regression approach. Time series annual data covering the period of 1980 to 2014 has been used for the empirical analysis. Augmented Dickey Fuller test has been used for checking the unit root in the data. Ordinary Least Squares method is used for the estimation of regression equations. For avoiding the problems of spurious relationship between the variables and series implications for the standard errors, various diagnostic tests have been applied. Initially study has taken exchange rate as dependent variable and some selected macroeconomic variables as independent variables. The result show that exchange rate has negative relationship with the variables such as inflation (INF), foreign direct investment (FDI), imports (IMP) and positive with
TCP/IP Based Intelligent Load Management System in Micro-Grids Network Using MATLAB/Simulink  [PDF]
Muhammad Ali, Muhammad Zakariya, Muhammad Asif, Amjad Ullah
Energy and Power Engineering (EPE) , 2012, DOI: 10.4236/epe.2012.44038
Abstract: Computerized power management system with fast and optimal communication network overcomes all major dicrepencies of undue or inadequate load relief that were present in old conventional systems. This paper presents the basic perception and methodology of modern and true intelligent load management scheme in micro grids topology by employing TCP/IP protocol for fast and intelligent switching. The network understudy performs load management and power distribution intelligently in a unified network. Generated power is efficiently distributed among local loads through fast communication system of server in the form of source and clients in the form of loads through TCP/IP. The efficient use of information between server and clients enables to astutely control the load management in a power system of micro grids system. The processing time of above stated system comes out to be 10ms faster than others which ensure very less delay as compared to conventional methods. The Micro Grids system operating through TCP/IP control has been implemented in MATLAB/Simulink and results have been verified.
Hydro and Wind Power Integration: A Case Study of Dargai Station in Pakistan  [PDF]
Shahbaz Awan, Muhammad Ali, Muhammad Asif, Amjad Ullah
Energy and Power Engineering (EPE) , 2012, DOI: 10.4236/epe.2012.44028
Abstract: Pakistan is facing acute energy crises since last few years. Due to shortage of fuel oil and its sky touching prices, it seems very uneconomical to generate electricity from fuel oil. In order to generate cheap electricity we have to rely on renewable energy resources. To address these challenges, wind power generation is among the popular options in the world which is now being considered in Pakistan as well. However unremitting change in wind speed from calm to stormy introduces real challenges. Storing wind energy in batteries during the periods of low demand seems an expensive option, especially when dealing with large scale power generation. Due to incessantly varying nature of wind speed, it is not feasible to rely only on wind power for cheap power production. Also, it is not thriftily possible to construct separate transmission line. However if we integrate wind power with hydro power, we can utilize the maximum possible transmission capacity. Existing hydro power station operating in that area or pumped storage scheme can be used. This paper is an attempt to analyze coordination of wind generation with hydro power in those areas of Pakistan where both wind and hydro power sources exist. In this paper, different issues have been analyzed taking case study of Dargai. This paper is first attempt in Pakistan about integration of wind and hydro power to draw some general conclusions and to point out some areas in which further research can be done.
Bianchi Type-V Cosmological Models for Perfect Fluid with Time-Varying Gravitational and Cosmological Constant  [PDF]
Mohammed Aman Ullah, Mohammad Amjad Hossain, Mohammad Moksud Alam
Journal of Applied Mathematics and Physics (JAMP) , 2017, DOI: 10.4236/jamp.2017.511185
Abstract: Einstein’s field equations with variable gravitational and cosmological constants are considered in presence of perfect fluid for locally-rotationally-symmetric (LRS) Bianchi type-V space-time discussion in context of the particle creation. We present new shear free solutions for both absence and presence of particle creation. The solution describes the particle and entropy generation in the anisotropic cosmological models. We observe that time variation of gravitational and cosmological constant is needed for particle creation phenomena. Moreover, we obtained the particle production rate Γ(t) for this model and discussed in detail.
Some differential subordination and superordination properties of symmetric analytic functions involving Noor integral operator
Ali Muhammad,Amjad Ullah Khattak
Le Matematiche , 2012,
Abstract: In this paper, we obtain some interesting properties of differential subordination and superordination for the classes of symmetric functions analytic in the unit disc, by applying Noor integral operator. We investigate several sandwich theorems on the basis of this theory.
Proper homothetic symmetry in Bianchi types VIII and IX space-times in teleparallel theory
Amjad Ali,Asmat Ullah Jan
International Journal of Contemporary Mathematical Sciences , 2012,
Abstract:
Intelligent Load Management Scheme for a Residential Community in Smart Grids Network Using Fair Emergency Demand Response Programs  [PDF]
Muhammad Ali, Z.A. Zaidi, Qamar Zia, Kamal Haider, Amjad Ullah, Muhammad Asif
Energy and Power Engineering (EPE) , 2012, DOI: 10.4236/epe.2012.45044
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 modelling 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 load management scenario.
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.
Factors Affecting the Adoption of Organic Farming in Peshawar-Pakistan  [PDF]
Arif Ullah, Syed Noor Muhammad Shah, Amjad Ali, Rubina Naz, Amanullah Mahar, Shahmir Ali Kalhoro
Agricultural Sciences (AS) , 2015, DOI: 10.4236/as.2015.66057
Abstract:
This study was conducted to investigate the factors affecting the adoption of organic farming in Peshawar-Pakistan. A total of 100 respondents were randomly selected from the four different cultivated areas of Peshawar, namely Palosi, Regi, Ternab and Pushtakhara. Binary logistic re-gression was used in this study to categorize the organic farming into adoption and non-adoption. The purpose of this model was to check the event probability for a categorical response variable with two outcomes. The results of the binary logistic show that factors affecting adoption of organic farming have a significant effect on the farmer productivity. Moreover, cost, productivity, profitability, compatibility and efficiency have a positive and significant effect. Thus, it is obvious that adopting organic farming not only to increase the farmer income but also to protect environmental pollution by avoiding the toxic chemical and fertilizer. Finally, we suggest that government agencies, extension and research institution should play a vital role to strengthen the awareness and advantages of organic farming.
Assessment of Forest Growing Stock of Timergara Forest Subdivision, Dir Lower Forest Division  [PDF]
Majid Ullah, Amjad Ali Khan, Aamir Saleem, Sajjad Saeed, Umar Wahab
Open Journal of Ecology (OJE) , 2015, DOI: 10.4236/oje.2015.511044
Abstract: The present study was aimed to assess the growing stock of Timergara forest subdivision which was a part of Dir lower forest division (Pakistan). The study area was divided into two different climatic zones (i.e. sub-tropical sub humid and sub-humid temperate zones) on the basis of altitudinal considerations. A total of 43 sample plots are taken in the forest area of 8480 hectare with random sampling technique representing 0.5% of the total forest area. Each sample plot size was of one hectare. In each 100 × 100 m (1 ha plot), number of trees, diameter, age, height, increment, form factor and volume were measured. An interrelation between the diameter (independent variable) and all the other dependent variables (volume, increment and height) were found. At the end, volume tables were made which suited the local conditions as the ones used before were not suited to the local conditions.
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