ARPN Journal of Engineering and Applied Sciences                         ISSN 1819-6608
   
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ARPN Journal of Engineering and Applied Sciences              February 2013 | Vol. 8  No. 2
   
Title:

Replica replacement algorithm for data grid environment

Author (s):

K. Sashi and T. Santhanam

Abstract:

Grid computing is one of the fastest emerging technologies within the high performance computing environment. Grid deployments that require access to and processing of data are called data grids. They are optimized for data oriented operation. In a data grid environment, data replication is an effective way to improve data accessibility. However due to limit storage a replica replacement strategy is needed to make the dynamic replica management strategy efficient. In this paper a dynamic replacement strategy is proposed for a region based network where a weight of each replica is calculated to make the decision for replacement. It is implemented by using a data grid simulator, Optorsim developed by European data grid projects.

 
 
 
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Title: Selection of beam squinting design parameters for optimal lp-rlsa antenna radiation performance
Author (s): Iliya S. Z, T. A. Rahman, H. U Iddi, Y. A Abdulrahman, T. Purnamirta, M. K. A Abdulrahman and S. I Orakwue
Abstract:

The linearly polarized radial line slots array antenna exhibits poor return loss. This problem was tackled by imploring the beam squinting and reflection cancelling slots techniques. This paper suggests the use of a numerical solution for selection of the beam squinted slots concentration on the radiation surface by x-raying best design parameters for optimal solutions using MALTAB computations for the objective function. This is aimed at minimizing design and computation time involved in the selection of optimal design parameters hence improving the entire production process. Results obtained from the numerical solutions were used as design parameters on CST MWS for the computation of the antenna radiation characteristics and showed excellent agreement with published literatures on optimal LP-RLSA beam squinted antenna designs in terms of gain and return loss values.

 
 
 
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Title:

Calculation of interfacial tensions between macromolecular solutions and soltrol-130 from contact angles measurements

Author (s):

Sinayobye E, Mensah-Brown H, Yaya A, Kakane V. C. K. and Baryeh E.A.

Abstract:

The determination of the surface tension of some liquids or solutions has been carried out using a tensiometer. The determination of the contact angle between the liquids and a planar surface has also been carried out using photography. Polar and dispersive contributions of the surface tension were obtained by calculation while the polarities of the liquids and solutions were determined applying Wu equations. This method gave the different results for solutions prepared from macromolecular compounds (acroleine-ethanolamine macromolecular solution 1g/l, acroleine -diethanolamine macromolecular solution 1g/l, polyglutaraldehyde-ethanolamine macromolecular solution 0.7 g/l and polyglutaraldehyde - diethanolamine macromolecular solution 1 g/l) synthesized by Malonda from glutaraldehyde and acroleine. The dispersive and polar contributions of the surface tension were computed and used to calculate the interfacial tensions of solutions by the simple measurement of the contact angle. The results have revealed that the computed interfacial tensions were comparable to the values measured directly by the tensiometer for polyglutaraldehyde-ethanolamine macromolecular solution 0.7 g/l and polyglutaraldehyde - diethanolamine macromolecular solution 1 g/l) making an interface with Soltrol-130 of 17.1 and 16.9 dynes/cm compared to direct measured values of 17.2 and 17.7 dynes/cm respectively representing 1% and 5% error respectively.

 
 
 
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Title:

Effect of ultrasonic frequency on chemical etching process

Author (s):

Yasmeen Z. Dawood, Ali H. Al-Hamdani and Mehdi Q. Zayer

Abstract:

In this work, ultrasonically enhanced chemical etching was employed to fabricate porous silicon layer. Porous silicon layer was fabricated in p-type (111) orientation silicon by using HF solution, and HNO3. It was found the structure of porous silicon layer on p-type Si was improved by ultrasonic. Porous silicon micro cavities with much higher quality factors can be fabricated by this method. The improved quality induced by ultrasonic etching can be ascribed to increased rates of escape of hydrogen bubbles and other etched chemical species from the porous silicon pillars' surface. The effect is attributable to effective change in the concentration of free holes carriers. Ultrasound has led to indicating probably a change in bonding configuration, and increase in oxidation. Also, a correlation was established between the ultrasonic treatment and the microstructure.

 
 
 
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Title:

Adapting runge - kutta learning algorithm in anfis for the prediction of cod from an up-flow anaerobic filter

Author (s):

Vijayabhanu. R. and Radha. V.

Abstract:

Water consumes vast area in the earthís surface and safe drinking water is essential for humans and other organisms to survive in the world. Eliminating waste matters from water is the necessary requirement nowadays. The ultimate purpose of wastewater treatment is the protection of good quality water which is the most priceless resource. Use of Artificial Neural Network (ANN) models is gradually increasing to predict wastewater treatment plant variables. This detection helps the operators to take proper action and manage the process accordingly as per the norms. Anaerobic processes are often preferred to aerobic processes for treating waste streams that contain high Chemical Oxygen Demand (COD) concentrations. Up-flow Anaerobic Filter (UAF) is a common process used for various anaerobic wastewater treatments. COD is used to measure the strength (in terms of pollution) of waste water. COD level in the effluents of the UAF determines the pollutants in the wastewater. The proposed method uses cheese whey as an influent. It is tested in the anaerobic reactor using COD test to predict the level of oxygen requirement of the effluent. Predicting the effluent parameters is a time consuming process when using Classical Models as it involves complexity and high non-linearity. Hence the proposed method uses an efficient technique namely Z-Score Normalization technique as a preprocessing step, Particle Swarm Optimization (PSO) for feature selection process and Adaptive Neuro-Fuzzy Inference System (ANFIS) with RungeKutta Learning Method (RKLM) as a learning algorithm is used for prediction of COD. Experiments conducted on a real data indicates that the application of Z-Score normalization schemes followed by a PSO feature selection and ANFIS with RKLM prediction results in better performance compared to other methods.

 
 
 
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Title:

Nile perch fish scales a novel biofilm carrier in the anaerobic digestion of biological pre-treated Nile perch fish solid waste

Author (s):

Kassuwi S. A. A., Mshandete A. M and Kivaisi A. K.

Abstract:

Improved stability and anaerobic digestion (AD) process in a packed bed bioreactor can be achieved if bacterial consortia are retained in the process through the use of biofilms carriers. Three methanogenic biofilms carriers for biomass retention were studied to evaluate the performance of methanogenesis AD of Nile Perch fish solid wastes pre-treated by bacterial culture coded (CBR-11). The carrier material evaluated consisted of sisal fibre waste, pumice stones and Nile perch fish scales. Process performance was investigated by increasing the organic loading rate (OLR) step-wise. The best results were obtained from the bioreactor packed with Nile perch fish scales. It had the lowest total volatile fat acids (TVFA) accumulated at OLR in the range of 1-12 g volatile solids (VS)/l/d. The degradation pattern showed that the TVFAs was limiting at higher OLRs. The pH profiles showed an increasing pattern with an increase in OLRs. The pH was low (8-8.3) at low OLRs (1-6) gVS/l/d and increased to a higher level (8.3-8.7) at higher OLR (9-12) gVS/l/d. Despite the high pH level reached, the bioreactor packed with fish scales had a good ability to withstand the changes in load and VFA concentrations shocks that can occur in packed bed anaerobic bioreactors. In conclusion Nile perch fish scales was demonstrated to be potential novel biofilms carrier that would work well in methanogenic biofilms bioreactors treating fish solid waste. Moreover, Nile perch solid fish wastes and fish scales are available within the vicinity, which could make AD scale-up at fish processing industry feasible and cost effective.

 
 
 
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Title:

Enhanced bacterial foraging algorithm for permutation flow shop scheduling problems

Author (s):

Shivakumar B L and Amudha T

Abstract:

Biologically Inspired algorithms are a kind of algorithms that imitate the problem solving behavior from biological species. Bio-inspired computing is a subset of Nature-inspired computing that focus on social behavior and emergence of biological species. Bacterial Foraging algorithm is a relatively new biologically inspired optimization technique based on the foraging behaviour of E. coli bacteria. This paper deals with one of the significant types of scheduling problems, the permutation flow shop scheduling problem. The competence of bacterial problem solving and a proposed hybrid bacterial swarming technique were analyzed by applying them to benchmark problems of permutation flow shop. A comparative analysis of the results indicates the improvement in scheduling efficiency in terms of reduced cost through the application of bio-inspired techniques.

 
 
 
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Title:

MV electrical network maintenance strategy: a new management approach

Author (s):

Mahmoudi Morad, El barkany Abdellah and El khalfi Ahmed

Abstract:

Todayís power electric distribution networks in Morocco are operated in a market sector or liberation is gradual. Managers the public electricity distribution networks are required to provide a number of reliability criteria, while minimizing the total cost spent for efforts made in ensuring the assets and maintain facilities in a proper condition to avoid degradation of the infrastructure. Nevertheless, the availability of this energy for a national emergent economy is very critical, seen the geographical extent of the heritage of strategic assets of networks throughout the country. However the network implements important technical assets that were built and developed over time that we canít their reserve all the same attention. The MV network asset maintenance activities need to be prioritised as budget and planned maintenance work time is often limited for all work to be carried out. Therefore we must identify that need priority action for reduces the number of operations while not compromising safety and efficiency and focus efforts on the minority elements which cause the majority of the harmful effects of the maintenance. However, the purpose of this paper is to present the deployment of an efficient management in order to establish a policy of optimizing maintenance resources, and to develop an approach for prioritizing maintenance work, to optimize spending, and improve the Key performance indicators (KPIís) of quality of electricity supply (System Average Interruption Duration Index (SAIDI), System Average Frequency Duration Index (SAIFI) and Energy Not Supplied (ENS)). A statistical methodology is adopted to develop a systematic approach based on a multicriteria prioritization matrix, in the objective to optimize the operational management of the maintenance works.

 
 
 
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Title: Renewable energy distributed electricity generation and microgrid implementation in rural villages: a review
Author (s): Mohammed Yekini Suberu, Nouruddeen Bashir and Adefemi Ogundola Mathew

Abstract:

There is a growing concern over the unprecedented increase in the demand for electrical energy to elicit all sort of development in any part of the world. Besides electricity needs for industrial development, much is also desired to satisfy domestic energy consumption. Presently, as much as 2 billion of human populations around the world live without access to modern energy (electricity) and approximately 98% of them dwelling in developing countries. More to this ugly pervasiveness is that rural and remote areas in developing countries are the major victims. This energy deficiency condition vehemently justifies the socio-economic disparity between industrialized and developing countries on wider geographical range as well as urban and rural areas on local scale. By analysis of documented evidence, there is need to swiftly change the current pattern of energy exploitation in developing countries to counteract the poor energy access scenarios. This paper previews renewable energy (RE) distributed generation (DG) and microgrid (MG) for rural electrification purposes. It also highlighted some important issues regarding effective DG implementation which could be applicable in rural energy design and planning procedures. Finally, some conceptual discussions related to RE distributed generation and integration in MG is outlined.

 
 
 
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Title: Design rectangular patch antenna for a dual-band by using different slots indoor wireless systems
Author (s): Karim A. Hamad

Abstract:

Microstrip patch antenna with a dual-band operating at 2.4 GHZ and 5.8 GHZ was designed. A dual-band operation is achieved by loading the antenna with different slots. Similar radiation characteristics at both bands of operation. So that two operating bands covering (2.3573-2.4476) GHZ, (5.5785-5.9653) GHZ can be achieved. The results obtained by (CST-2010) software package. This antenna is fed by a coaxial probe feeding. The antenna has a directivity of 6.31dBi and 8.69dBi respectively.

 
 
 
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Title: Presenting a new lamination method for the elastic analysis of multilayer cylindrical shells
Author (s): Arash Ansari, Yaser Mohamadi and Mohamad Taher Kamali

Abstract:

In this article, by using the lamination theory, three hypothetical equations with unknown coefficients have been considered for the modeling of the displacement behavior of each layer of a shell in the cylindrical coordinate system, which completely satisfy the natural and geometrical boundary conditions. In this article, complete continuity has been assumed between the layers of a multilayer shell at their common boundaries, and this continuity is modeled by considering the same behavioral equations at the interface of two adjacent layers. By using the first law of thermodynamics to obtain the total potential energy of the layers, and by taking the derivative of this total energy equation with respect to the unknown coefficients of displacement equations and solving the resulting system, these coefficients are determined. It is obvious that, by knowing a shellís displacement equations, the other quantities needed for the analysis of the shell can be calculated as well.

 
 
 
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