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International Journal of Advances in Applied Sciences

IJAAS
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Published by Institute of Advanced Engineering and Science

ISSN : 22528814 EISSN : 27222594 DOI : http://doi.org/10.11591/ijaas

Core Subject : Science, Education, Social,

Earth & Planetary Sciences Environmental Science Materials Science & Nanotechnology Mathematics Physics

International Journal of Advances in Applied Sciences (IJAAS) is a peer-reviewed and open access journal dedicated to publish significant research findings in the field of applied and theoretical sciences. The journal is designed to serve researchers, developers, professionals, graduate students and others interested in state-of-the art research activities in applied science areas, which cover topics including: chemistry, physics, materials, nanoscience and nanotechnology, mathematics, statistics, geology and earth sciences.

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Articles 635 Documents

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Design of Converters for PV System Under Partial Shading Conditions M. Kowsalya; K. Balsubramanyam
International Journal of Advances in Applied Sciences Vol 6, No 2: June 2017
Publisher : Institute of Advanced Engineering and Science

This paper presents a maximum power generation with the interconnection of photovoltaic modules under partially shaded and/or mismatching conditions. The partial shading condition reduces power level of each module. The reduction in power due to the partial shading will be compensated by the bidirectional converter. The proposed system consisting of two and three PV modules connected in series under partial shading conditions which are capable of increasing the power levels up to 50% compared to conventional by-pass diode structure. In general ‘n’ number of modules connected in series so that the maximum power gain will be expected to (100/n) %. This is achieved by developing the new control strategy in which the correct adjustment of converter duty ratio under partially shading conditions. The novel control scheme is developed by using analysis of the power converters. The proposed scheme was verified in MATLAB/SIMULINK.

Shells of Telescopium Telescopium as Biomonitoring Materials of Ni Pollution in the Tropical Intertidal Area C. K. Yap
International Journal of Advances in Applied Sciences Vol 3, No 1: March 2014
Publisher : Institute of Advanced Engineering and Science

The objective of this paper is to propose the use of the shells of Telescopium telescopium as good biomonitoring materials of Ni pollution. The snail and surface sediment samples were collected from 17 geographical sites in Peninsular Malaysia and they were dissected into six different soft tissues, namely foot, cephalic tentacle (CT), mantle, muscle, gill and remaining soft tissues (REST). The total shells, pooled and dissected soft tissues and sediments were determined for Ni using an air-acetylene flame Atomic Absorption Spectrophotometer. The present findings based on 1) ratios of shell/soft tissues (ratios> 1.0), 2) bioaccumulation factor values (shell as microconcentrator), 3) statistical outcomes of correlation analysis [significant correlations between shells and geochemical fractions (acid-reducible, non-resistant, resistant and total Ni concentrations) in the environmental sediments] and multiple linear stepwise regression analysis [significantly influenced by total Ni concentrations in the sediment], and 4) lowest value of coefficient of variation [thus higher precision], do indicate the very potential of shells of T. telescopium as good biomonitoring material of Ni pollution in the tropical intertidal area.

Review on Recent Advances in Titanium Dye Oxide Nanoparticles for Dye Sensitized Solar Cell Applications divya Chandran
International Journal of Advances in Applied Sciences Vol 6, No 2: June 2017
Publisher : Institute of Advanced Engineering and Science

Alternate energy source becomes a crucial for green energy solution against ever increasing demand. Dye Sensitized solar cell is another promising option toward green energy providing opportunity to explore natural dye extracts from plants. This review explores recent developments in the field of Dye Sensitized solar cell technology specifically with sensitizer synthesized from plants which are also found in India. Anthocyanin, betalain, chlorophyll and carotenoids are among the most common plant pigments explored as sensitizers. The review of different attempts on fabrication of natural dye based solar cells implies that titanium dioxide (TiO2) nano particles can be used as photoanode, platinum (Pt) as counter electrode and iodine/iodide electrolyte. Plant pigments are highly pH sensitive and can alter solar cell performance based on its extraction method, concentration and its ability to anchor with photoanode. Stability of dye, absorption in near IR range and leakage of liquid electrolyte are few of the challenges ahead. However, natural dye is biodegradable and non-toxic having most of the extraction process harmless to environment. In addition, natural dye has the promising future as it is abundant.

Cost effective and Monodispersed Zinc Oxide Nanoparticles Synthesis and their Characterization Rohit Saraf
International Journal of Advances in Applied Sciences Vol 2, No 2: June 2013
Publisher : Institute of Advanced Engineering and Science

Zinc Oxide (ZnO) Nanoparticles are most widely used in the field of Biotechnology and Nanoelectronics due to their good transparency, high electron mobility, strong room-temperature luminescence and nontoxic. Due to their increasing demand, highly specified and monodispersed nanoparticles formation is a revolutionary field. Here ZnO nanoparticles are prepared by modified sol-gel method and are characterized using UV-Vis Absorption Spectroscopy, X-ray Diffraction and Scanning Electron Microscopy (SEM). Modified sol-gel mediated ZnO nanoparticles are proved to synthesize the highly stable, monodispersed and cost effective nanoparticles. The results are quite appreciable and wide band gap- long range ordered ZnO nanoparticles are obtained than the conventional route.

The Empirical Analysis to Enhance Taiwanese Satisfaction in Buying Vietnam coffee Thi Nham Le; Chia Nan Wang; Ying Fang Huang
International Journal of Advances in Applied Sciences Vol 6, No 3: September 2017
Publisher : Institute of Advanced Engineering and Science

Vietnam coffee industry has been well-known over the world for many decades. However, Vietnam products do not meet Taiwan customers’ expectation, it has lead to urgent challenges for the industry. Therefore, the paper proposed the integrated approach by using exploratory factor analysis, reliability analysis and regression analysis. The results of this study were used to formulate and recommend on how to improve the products of Vietnam coffee by using SPSS statistics for analysis. The major findings of this paper was found out that there are six important determinants of Taiwanese decision-making in buying coffee. In order to enhance customer satisfaction with the coffee products from Vietnam, the companies need right strategies to improve these six groups of factors. The paper contributes meaningful and helpful results to the development of Vietnam coffee industry.

Byssus as a Means of Metal Excretion Route and High Metal Levels in Fecal Materials as Metal Retention: An Experimental Laboratory Study Using Perna viridis C. K. Yap
International Journal of Advances in Applied Sciences Vol 1, No 4: December 2012
Publisher : Institute of Advanced Engineering and Science

The present study aimed at determining the concentrations of Cd, Pb and Zn in fecal materials, byssus and different soft tissues of Perna viridis under controlled laboratory conditions during accumulation and depuration tests and to discuss the roles played by byssus and fecal materials in the coastal waters. The present findings indicated that the byssus of P. viridis acted as an excretion routes for Cd, Pb and Zn while mussels have a retention mechanism of metals as evidenced in the high metal levels found in the fecal materials during the experimental study. This implied that mussel population played an important role in expediting the metal cycling as well as supposedly nutrient cycling in the coastal ecosystem by rapidly recycling back to the coastal environment in the underlying sediments.

An Examination of the Impact of Power Sector Reform on Manufacturing and Services Sector in Nigeria: an Empirical Analysis Emmanuel Ameh Ojiya; Ngwu Jerome Chukwuemeka; B.A. Daneji; George Duhu Isiwu
International Journal of Advances in Applied Sciences Vol 7, No 2: June 2018
Publisher : Institute of Advanced Engineering and Science

The main objective of this study is to empirically examine the impact of Power Sector Reform on Manufacturing and Services Sector in Nigeria between 1999-2016. The study employed secondary annual time series data sourced from World Bank database (2016). The methodology adopted for the study was Augmented Dickey-Fuller (ADF); a test for long-run relationship using ARDL Bounds Testing approach with analysis of long-run and short-run dynamics in the model. A striking revelation from the study is the inverse relationship that exists between manufacturing output and electricity consumption in Nigeria within the period referenced. This negative relationship is not unconnected with widespread allegation of misappropriation of budgeted funds for the Power Sector by successive administrations in Nigeria since 1999. It must be stated in clear terms that constant and consistent electricity generation, transmission and distribution is sine-qua-none for the growth of the national economy. Virtually all sectors of the economy depend on the supply of electricity to do business and so the lack of this vital ingredient of growth contributes in no small measure in stagnating economic growth and development. Efforts at reforming the power sector can only be fruitful when ALL stakeholders in the power sector including the political class put away their personal agendas and take the bull by the horn towards rescuing the nation from the looming danger of stagnant economic growth. Furthermore, there is the need for the Nigerian government to come up with new, better and alternative ways of improving energy generation and supply, as well as proper maintenance of electricity infrastructure in the country.

Design Thin Film Narrow Band-pass Filters For Dense Wavelength Division Multiplexing Gaillan H. Abdullah; Bushra R Mhdi; Nahla A.Aljaber
International Journal of Advances in Applied Sciences Vol 1, No 2: June 2012
Publisher : Institute of Advanced Engineering and Science

We present tow different design thin film multi-cavity narrow band-pass filter. These filters are most widely used filtration technologies that made possible technical advancement of modern optical communication system. This paper is concerned with a theoretical study on optoelectronics physics to design and analyze this type of filter. A brief introduction to the thin film multi-cavity filter technology will be presented. The recent progress in design thin film multi-cavity technology will be reviewed. These designs consist of two material TiO2 / SiO2 as high / low index. The wavelength range from 600 to 900nm and detecting light at three and four wavelengths' 620,700 and 805 also 625,685,760 and 885nm. The filter is to be coated on Fused Silica having index 1.55 and operates at normal incidence.

An Improved Greedy Parameter Stateless Routing In Vehicular Ad Hoc Network Kavita Kavita; Neera Batra; Rishi Pal Singh
International Journal of Advances in Applied Sciences Vol 7, No 1: March 2018
Publisher : Institute of Advanced Engineering and Science

Congestion problem and packet delivery related issues in the vehicular ad hoc network environment is a widely researched problem in recent years. Many network designers utilize various algorithms for the design of ad hoc networks and compare their results with the existing approaches. The design of efficient network protocol is a major challenge in vehicular ad hoc network which utilizes the value of GPS and other parameters associated with the vehicles. In this paper GPSR protocol is improved and compared with the existing GPSR protocol and AODV protocol on the basis of various performance parameters like throughput of the network, delay and packet delivery ratio. The results also validate the performance of the proposed approach.

Real power loss reduction by hyena optimizer algorithm Lenin Kanagasabai
International Journal of Advances in Applied Sciences Vol 9, No 3: September 2020
Publisher : Institute of Advanced Engineering and Science

To solve optimal reactive power problem this paper projects Hyena Optimizer (HO) algorithm and it inspired from the behaviour of Hyena. Collaborative behaviour & Social relationship between Hyenas is the key conception in this algorithm. Hyenas a form of carnivoran mammal & deeds are analogous to canines in several elements of convergent evolution. Hyenas catch the prey with their teeth rather than claws – possess hardened skin feet with large, blunt, no retractable claws are adapted for running and make sharp turns. However, the hyenas' grooming, scent marking, defecating habits, mating and parental behaviour are constant with the deeds of other feliforms. Mathematical modelling is formulated for the basic attributes of Hyena. Standard IEEE 14,300 bus test systems used to analyze the performance of Hyena Optimizer (HO) algorithm. Loss has been reduced with control variables are within the limits.

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