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Search Results: 1 - 10 of 1034 matches for " Tarek Hamad "
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Investigating the Use of Combined Hydrogen, Heat and Power System for Omar AL-Mukhtar University Campus  [PDF]
Moutaz Benali, Tarek Hamad, Ahmad Belkhair, Yousif Hamad
Advances in Biological Chemistry (ABC) , 2019, DOI: 10.4236/abc.2019.91003
Abstract: This paper investigates the use of a combined hydrogen, heat, and power (CHHP) system for Omar Al-Mukhtar University campus using local resources. Based on previous local resource assessment studies, the hydrogen team of Omar AL-Mukhtar University (OMU) selected the fuelcell energy DFC4000TM unit. This study shows that the CHHP system can provide electricity to power the university campus, thermal energy for heating the anaerobic digester, and hydrogen for transportation, back-up power and other needs. Consequently, using the alternative fuels and renewable energy resources for OMU campus can lower fossil fuel consumption and, therefore, greenhouse gas emissions (GHG).
The Hydrogen Energy Potential of Solid Waste: A Case Study of Misrata City  [PDF]
Moutaz Benali, Tarek Hamad, Yousif Hamad, Ahmad Belkhair
Advances in Biological Chemistry (ABC) , 2019, DOI: 10.4236/abc.2019.92004
Abstract: This study presents an overview on solid waste that can be used as a source of bioenergy in Misrata including municipal solid waste (MSW), industrial solid waste (ISW), and healthcare solid waste (HSW) as biomass sources. The management of solid waste and valorization is based on an understanding of MSW’s and HSW’s composition and physicochemical characteristics. Of MSW’s, the results show that organic matter represents 59% of waste, followed by paper-cardboard 12%, miscellaneous 10%, plastic 8%, metals 7% and glass 4%. While HSW comprised of 72% general healthcare waste (non-risk) and 28% hazardous waste. The average general waste composition was: 38% organic, 24% plastics, and 20% paper. The potential of hydrogen energy produced from biogas in Misrata including MSW, and other organic feedstock such as food and kitchen waste, animal wastes, clover and reeds, wheat residues, barley residues, HSW and sewage waste as biomass sources. The total potential hydrogen output is estimated to be around 10,265 tons per year.
Experimental Study of Biogas Production from Cow Dung as an Alternative for Fossil Fuels  [PDF]
Moutaz Benali, Tarek Hamad, Yousif Hamad
Journal of Sustainable Bioenergy Systems (JSBS) , 2019, DOI: 10.4236/jsbs.2019.93007
Abstract: To treat the problem of fossil fuel usage and greenhouse gas emissions, biogas is considered a potential source of clean renewable energy. The aim of the work is to analyze the amount of biogas and ph from cow dung when an anaerobic digester operates in the mesophilic mode. In this study is presented the experimental investigation of biogas production from cow dung as an alternative energy resource. This is work using an 18 Liters capacity plastic as prototype biogas plant, plant to inspect the anaerobic digestion in producing biogas. The digester was batch operated and daily gas produced from the plant was observed for 30 days. The digester was fed within the ratio of 1:1 of dung to water respectively. The operating temperatures of the digester were maintained within mesophilic conditions. The Biogas production from cow dung fluctuates from the first day to the thirtieth day between 0 and 340 ml. The pH of cow dung is gradual reduction within the retention period.
An Inflation Targeting Regime in Egypt: A Feasible Option?  [PDF]
Tarek Ghalwash
Modern Economy (ME) , 2010, DOI: 10.4236/me.2010.12009
Abstract: This paper addresses first whether scientific evidence—theoretical and empirical—exists to support the inflation targeting regime and, secondly whether inflation target is worthwhile for Egypt. The method in this paper builds on a literature review of the theoretical and empirical research in the field of economics. Our conclusion shows that there is incomplete evidence from a number of countries supporting the inflation targeting regime as an effective monetary policy framework for the achievement of macroeconomic stability. The paper concludes that the Central Bank of Egypt and the Egyptian economy is not yet ready for the implementation of an inflation targeting regime.
Roughly B-invex Multi-Objective Programming Problems  [PDF]
Tarek Emam
Open Journal of Optimization (OJOp) , 2012, DOI: 10.4236/ojop.2012.11001
Abstract: In this paper, we shall be interested in characterization of efficient solutions for special classes of problems. These classes consider roughly B-invexity of involved functions. Sufficient and necessary conditions for a feasible solution to be an efficient or properly efficient solution are obtained.
Corruption and Economic Growth: Evidence from Egypt  [PDF]
Tarek Ghalwash
Modern Economy (ME) , 2014, DOI: 10.4236/me.2014.510092
Abstract: Based on a theoretical consideration of economic growth model, this study empirically investigates the direct and indirect impact of corruption on economic growth by incorporating the corruption index in the growth model in the case of Egypt. The model provides a simple theoretical framework in which the level of corruption as well as the effects of corruption on output variables; forging direct investments, government expenditure, openness and political instability are identified. Our main result provides empirical evidence suggesting that corruption increases inefficiencies in government expenditure and reduces investment and human capital, leading to a negative impact on output. In addition, the human capital, openness and political instability are the most important channel variables, through which corruption is likely to reduce growth.
Performance Enhancement of SOVA Based Decoder in SCCC and PCCC Schemes  [PDF]
Ahmed A. Hamad
Wireless Engineering and Technology (WET) , 2013, DOI: 10.4236/wet.2013.41006
Abstract:

This study proposes a simple scaling factor approach to improve the performance of parallel-concatenated convolutional code (PCCC) and serial concatenated convolutional code (SCCC) systems based on suboptimal soft-input soft-output (SISO) decoders. Fixed and adaptive scaling factors were estimated to mitigate both the optimistic nature of a posteriori information and the correlation between intrinsic and extrinsic information produced by soft-output Viterbi (SOVA) decoders. The scaling factors could be computed off-line to reduce processing time and implementation complexity. The simulation results show a significant improvement in terms of bit-error rate (BER) over additive white Gaussian noise and Rayleigh fading channel. The convergence properties of the suggested iterative scheme are assessed using the extrinsic information transfer (EXIT) chart analysis technique.

 

Estimation of Two-Dimensional Correction Factors for Min-Sum Decoding of Regular LDPC Code  [PDF]
Ahmed A. Hamad
Wireless Engineering and Technology (WET) , 2013, DOI: 10.4236/wet.2013.44027
Abstract:

In this paper, two-dimensional (2-D) correction scheme is proposed to improve the performance of conventional Min-Sum (MS) decoding of regular low density parity check codes. The adopted algorithm to obtain the correction factors is simply based on estimating the mean square difference (MSD) between the transmitted codeword and the posteriori information of both bit and check node that produced at the MS decoder. Semi-practical tests using software-defined radio (SDR) and specific code simulations show that the proposed quasi-optimal algorithm provides a comparable error performance as Sum-Product (SP) decoding while requiring less complexity.

Studying the Preheating Effect on Certain Mechanical Properties of the Coating Layer by Vacuum Ion Plasma Coating  [PDF]
Abdul Jaleel Hamad Majeed
Modern Mechanical Engineering (MME) , 2015, DOI: 10.4236/mme.2015.54010
Abstract: The present paper is concerned with the study of two main points: clarifying the effect of preheating on the surface microscopic shape of coating layer by vacuum ion plasma coating technology and on the amount of micro-hardness besides studying the properties of the surfaces that concern the parts of the mechanical system because of their direct and active effect on the machine efficient performance and machine life in general and their important effect on the product efficiency. As known, the instruments that measure the traditional roughness give us numbers and charts that, to a certain extent, describe the actual state of the surface shape within limited range of accuracy, but it has become necessary to find more accurate methods that suit the development obtained in industry, namely, the important applications like aircraft missiles and others. One of the suggested solutions for this is to get benefit of average fractal dimension for the surface by the help of the new technologies which, in return, help in the possibility to determine the surface state with high accuracy that matches the importance of application.
The Impact of Political Reforms on Stability in Jordan: (2011-2018)  [PDF]
Aref Humeidi Hussein Bani Hamad
Open Journal of Political Science (OJPS) , 2019, DOI: 10.4236/ojps.2019.91007
Abstract: This study aimed to identify the relationship between political reform and political stability in Jordan through a quick review of the concepts and indicators of political reform and political stability. The study yielded a number of findings, the most important of which was that Jordan’s stability is relative; the process of political reform in the country has made some achievements but that it has not been enough to achieve the desired political stability. The study emphasized that genuine political reform will impact Jordan’s stability positively, and when this logic prevails, the situation will change for the better, human rights and freedoms are safeguarded, harmony and justice predominates community, security and stability of the ruler and the ruled alike.
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