Volume 2 Number 1 (2017)

IMPROVEMENT OF SURVIVABILITY OF A POWER PLANT'S DIRECT CURRENT AUXILIARY POWER SYSTEM UNDER ELECTROMAGNETIC PULSE (HEMP)
Vladimir Gurevich
Abstract:High Altitude Electromagnetic Pulse (HEMP) is a challenging agent aimed to destroy the most critical types of electronic equipment in the most important components of national infrastructure. The article addresses the issue of improvement of a power plant's direct current auxiliary power systems (DCAPS) survivability under HEMP impact, and suggests certain simple measures and affordable technical means that ensure significant improvement of DCAPS's resistance to HEMP.
Keywords:Power Plant; Electromagnetic Pulse; Hemp; Direct Current Auxiliary Power System.
DOI:https://doi.org/10.29121/IJOEST.v2.i1.2017.01
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DESIGN OF HEXAGONAL PHOTONIC CRYSTAL FIBER WITH ULTRA-HIGH BIREFRINGENT AND LARGE NEGATIVE DISPERSION COEFFICIENT FOR THE APPLICATION OF BROADBAND FIBER
S. M. Rakibul Islam, Md. Monirul Islam, Md. Nafiz Ahbabur Rahman, Mohammad Mahmudul Alam Mia, Md Shahrier Hakim, Shovasis Kumar Biswas
Abstract:The purpose of this paper is to design a hexagonal microstructure photonic crystal fiber (PCF) which gives ultra-high birefringence and very low confinement loss for sensing application. To characterize the modal properties of the proposed photonic crystal fiber, finite element method is used. We found ultra-high birefringence of 3.34X10-2 at operating wavelength 1550nm by using simulation software comsol multiphysics. Our proposed PCF gives large value of nonlinear coefficient of 63.51 W-1km-1, large value of negative dispersion coefficient of -566.6 ps/ (nm.km), and also ultra-low confinement loss which is in the order of 10-7.
Keywords:Photonic Crystal Fiber (PCF); Ultra-High Birefringence; Nonlinear Coefficient.
DOI:https://doi.org/10.29121/IJOEST.v2.i1.2017.02
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HEAVY METALS IN SOIL AND VEGETABLES AND THEIR EFFECT ON HEALTH
Jitender Pal, Mukal Bishnoi, Mandeep Kaur
Abstract:The present study was carried out to assess heavy metals Cadmium (Cd), Lead (Pb), copper (Cu), zinc (Zn), Chromium (Cr) and Nickel (Ni) levels in vegetables like Cauliflower (Brassica oleracea var. botrytis), Cabbage (Brassica oleracea), Carrot (Daucus carota), Brinjal (Solanum melongena), Spinach (Spinacia oleracea) and Radish (Raphanus sativus) irrigated with domestic wastewater. The vegetable samples were randomly collected from the farmlands irrigated with domestic wastewater around the Hisar district. Spinach, cabbage, brinjal and carrot accumulated higher Cd (1.30+/-0.31 mg kg-1), Pb (4.23+/-0.32 mg kg-1), Cu (1.42+/-0.25 mg kg-1), Zn (3.4+/-0.28 mg kg-1), Cr (1.16+/-0.11 mg kg-1) and Ni (2.45+/-0.86 mg kg-1) respectively. Transfer Factor (TF) of Cd, Pb, Cu, Zn, Cr and Ni are more in spinach (0.0306), cabbage (0.4448), spinach (0.2642), cauliflower (0.2494), carrot (0.0764) and spinach (0.7469) respectively. The health risk assessment has been calculated followed by Estimated Daily Intake Metal (EDIM) and Estimated Health Risk Index (EHRI). The present study highlights that both adults and children consuming vegetables grown in wastewater irrigated soils accumulate significant amount of these metals. However, the values of these metals were lesser than recommended maximum tolerable levels proposed by the FAO/WHO (1999).
DOI:https://doi.org/10.29121/IJOEST.v2.i1.2017.03
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PREDICTING STUDENT'S CHOICE OF HOSTEL: AN APPLICATION OF MULTINOMIAL LOGISTIC REGRESSION
Kassim Korah Nantomah, Baako Haruna, Joseph Kunibara Kaba
Abstract:Choice of hostel is a crucial decision to every student in tertiary education institution in Ghana. Government hitherto provides hostels for students, but due to limited resources of the state, private sector investors now support government. This creates an opportunity for students to decide which hostel to choose. Student's choice of hostel is influenced by several factors, but this study focused on only student's background variables. The study used multinomial logistic regression to predict student's choice of hostel in Ghanaian polytechnics. A simple random sample of 300 students was selected from Bolgatanga Polytechnic for the study. The selected students responded to a questionnaire that sought data on their background variables. The data was analyzed using SPSS Version 16.0. The results showed that male students exhibit significant preference for Local House to Private Hostel than female students. Significance preference was also shown for Private Hostel and Polytechnic Hostel to Local House by students with literate mothers. In addition, students from low income families also show significant preference for Local House to Private Hostel than their fellows from high income families. The results further established another significant prediction that students who have relationship problems with other students prefer Local House to Private and Polytechnic Hostels. The study recommends that management should consider students with illiterate mothers in Polytechnic Hostel first and also strengthen school-community relationship since some students prefer Local Houses to Polytechnic and Private Hostels.
Keywords:Choice; Hostel; Logistic; Multinomial; Private.
DOI:https://doi.org/10.29121/IJOEST.v2.i1.2017.04
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EXTRACTION OF ELIONURUS HENSII K. SCHUM ESSENTIAL OIL IN A DOMESTIC SCALE IN THE "PLATEAU DES CATARACTES" (CONGO-BRAZZAVILLE)
Silou T, Nombault Nienzy JP, Nsikabaka S, Loumouamou AN, Bikindou K
Abstract:Elionurus hensii yields essential oils composed mainly of para-menthadienols in its stems and about 50 % aristo lone in its roots. These oils, which exhibit anti-microbial and anti-oxidant properties, were extracted by hydro distillation with a local extractor and was analyzed by gas chromatography (GC/FID and GC/MS). To optimize this domestic process, a 23 full factorial design is used to assess the effects and interactions of potentially influential factors. Stems yield 1-2% in essential oil. The extraction time and the degree of division of the plant material had negligible effects on the yield. Only the residual water content had a significant positive effect, together with the interaction between this content and the degree of division. The cumulated content of the four isomeric para-menthadienols present in the oil was insensitive to the effects and interactions of the factors. Roots yield 0.5 - 0.9 % in essential oil. The overall effects and interactions of factors on the yield and the aristo lone content were negligible. Principal component analysis of samples obtained with the experimental design, and their radar plots, indicated a very strong resemblance between oils obtained from the same plant part, and a marked difference between those obtained from different plant parts.
Keywords:Experimental Design; Effects of Factor; Multivariate Analysis; P- Menthadienols; Aristo lone, Elionurus Hensii.
DOI:https://doi.org/10.29121/IJOEST.v2.i1.2017.05
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