Vol 3 Issue 1 April 2015-September 2015

Abstract: Asymptotically exact and nonlocal fourth order nonlinear evolution equations are derived for two counter propagating surface capillary gravity wave packets in deep water in the presence of wind flowing b over water. On the basis of these evolution equations stability analysis is made for a uniform standing surface capillary gravity wave trains for longitudinal perturbation. Instability condition is obtained and graphs are plotted for maximum growth rate of instability and for wave number at marginal stability against wave steepness for some different values of dimensionless wind velocity. Significant deviations are noticed from the results obtained from third order nonlinear evolution equations.

Keywords: Nonlinear evolution equation, capillary gravity, waves, stability analysis. 

Title: Fourth Order Nonlinear Evolution Equations for Counter Propagating Capillary Gravity Wave Packets In The Presence Of Wind Flowing Over Water

Author: A.K. DHAR, J.MONDAL

International Journal of Mathematics and Physical Sciences Research

ISSN 2348-5736 (Online)

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Abstract: The number of people with diabetes is increasing all over the world. A misconception that diabetes is a disease for urban areas while rural areas are also concerned; this is the motivation of the study. In this paper, a multiple logistic model is used to fit the risk factors of diabetes. A three year period (2011 to 2013) data from Gitwe Hospital are used. The test of independence between the dependent variable (diabetes) and the independent variables is performed. It is found that older age, alcohol consumption, cholesterol level, occupation status and hypertension were associated with the outcome of having diabetes. The predictors like gender; smoking, family history of diabetes had negligible association with having diabetes.

A multiple logistic regression model containing all the predictor variables is fitted and a test of significance on coefficients is performed. The Wald test reveals that on one hand, the significant predictors are: older age, Occupation status, Alcohol consumption, Cholesterol level and Hypertension. On the other hand, the predictors which are not statistically significant are: Gender, smoking and family history of diabetes.          

From the odds ratio results, older age persons, patients who consume alcohol, patients with high cholesterol level and hypertensive persons are highly susceptible for diabetes occurrence.

Finally, a multiple logistic regression with only significant parameters was fitted. Based on their respective Receiver Operator Characteristic (ROC) curve and their overall explanatory strength the conclusion is that the reduced model fits better the data than the model with all predictor variables.

Keywords: Generalized model, Logistic regression, Diabetes, risk factors.

Title: Multiple Logistic Regressions Modeling on Risk Factors of Diabetes: Case Study of GITWE Hospital (2011-2013)

Author: Niyikora Sylvere, Dr. Joseph K. Mungatu, Dr. Marcel Ndengo

International Journal of Mathematics and Physical Sciences Research

ISSN 2348-5736 (Online)

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Abstract: The goal of this study was to analyse the natural radioactivity levels and assess the contribution of different rock types to environmental dose in the Kerio Valley region of Kenya, a suspect high background radiation area (HBRA). The activity concentrations of 238U, 232Th and 40K in granite, sandstone, tuff, limestone, quartzite, gneiss, marble and conglomerate  rocks were found to vary from 72.70±8.47 Bqkg-1-116.15±11.46 Bqkg-1, 40.32±14.48 Bqkg-1- 83.65± 9.91 Bqkg-1 and 427.41±48.23 Bqkg-1-1397.24±65.27 Bqkg-1 respectively.  Radium equivalent activity and  external hazard index show that all the rock types do not exceed the recommended limit of 370 Bqkg-1 and 1, respectively. Calculated outdoor absorbed dose rate ranged from 90.585 nGyh-1 (limestone) to 159.085 nG/h (quartzite) while the indoor absorbed dose rate ranged from 66.696 nGyh-1(limestone) to 157.442 nGyh-1 (quartzite), which are above the world average value of 60nGy-1. The annual effective dose rate analysis is also presented.

Keywords: Natural radioactivity; rock types; gamma spectrometry; radium equivalent activity; gamma index; dose rates.

Title: Assessment of Radioactivity Levels and Risks Due To Different Rock Types from the KERIO Valley “High Background Radiation Area (HBRA)” of Kenya

Author: Jared Omari Agora, Nadir Omar Hashim

International Journal of Mathematics and Physical Sciences Research  

ISSN 2348-5736 (Online)

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Abstract: Zinc aluminate (ZnAl2O4) being of spinal shaped has drawn considerable attention as a catalytic material. It can be improves proprieties like high thermal stability, high mechanical resistance, crystal structure and the optical spectra [1-4]. More over zinc aluminate tends to prevent sintering of starting materials due to a strong material-support interaction. Nano sized zinc aluminate powder was prepared by heating method at 6000C sintering temperatures. Zinc sulphate (ZnSO4), alum (Na2SO4-Al2O3-24 H2O) potassium dichromate (K2Cr2O7) and urea (NH2 CO NH2) were used as starting materials. Here urea is used as a chelating agent.

Keywords: spinal zinc aluminate, picture of fired sample and SEM of samples.

Title: Prepration of Ceramic Material Dopped with Cr 3+

Author: Asif jehan, Dr. shirish joshi, Dr. M.N. Bapat

International Journal of Mathematics and Physical Sciences Research  

ISSN 2348-5736 (Online)

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Abstract: In this paper we will show that                                                                                                         

1.   Every simple ring is exact.

2.   If R be any simple ring then each direct summand of  R and R is exact.

3.   If R be any simple ring then any free left module over R is exact.

4.   Let m, n N then for any simple ring R the bimodule Hom (R , R ) is exact left M (R) and right M (R) bimodule.

5.   Let n N then for any simple ring R, End (R ) End (R )is exact.

6.   For any simple ring R and any idempotent e in R, ReR≠0 is exact.

7.   If R be any simple ring e be any idempotent in R then Hom (Re eR , R) and Hom (eR Re , R) are exact. 

Throughout this paper we will consider that all rings have unity and all modules are unitary.

Keyword: Simple Ring, Direct summand, free left module, Bimodule, Exact module, Idempotent

Title: Generalization of Exactness on Simple Ring

Author: Dr. Sumit Kumar Dekate

International Journal of Mathematics and Physical Sciences Research  

ISSN 2348-5736 (Online)

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Abstract: A “mysterious” flow spins the water along the littoral perimeter of the lake in Warm Mineral Springs (North Port, Florida, USA) only between 9:00 AM and 5:00 PM. Why is the lake on such a puzzling schedule?

Keywords: Human propulsion, Lake Hydrology, littoral flow, whirlpool, energy balance, artesian lake, sink hole, Warm Mineral Springs spa.

Title: Human Spoon Propulsion Phenomenon

Author: ILYA TYOMKIN

International Journal of Mathematics and Physical Sciences Research

ISSN 2348-5736 (Online)

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Abstract: Zinc aluminates (ZnAl2O4) being of spinal shape has drawn considerable attention as a catalytic material in making ceramics. It can improve the properties of the host like high thermal stability, high mechanical resistance, and simpler crystal structure and affects the optical spectra [1-4]. Moreover zinc aluminates tend to eliminate sintering of starting materials due to a strong material-support interaction. Zinc sulphate (ZnSO4), alum (Na2SO4-Al2O3-24 H2O), potassium per magnet (KMnO4), and urea (NH2-CO-NH2) were used as starting materials. In this process urea is used as a chelating agent.

Keywords:  Spinal structured zinc aluminate, look of fired sample, chelating agent, SEM of samples.

Title: Changes in Physical Properties of Zinc Aluminates Ceramics upon Doping

Author: Asif Jehan

International Journal of Mathematics and Physical Sciences Research

ISSN 2348-5736 (Online)

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Abstract: This paper investigated the effective parameters of composite materials in the case of external stress with finite length of electromagnetic (EM) - waves in the presence of essential gradients and frequency characteristics of the field. During the propagation of long waves, the approximation of electromagnetic field can be characterized by dielectric and magnetic permeability, the value of which is determined by comparing the main characteristics of the field in anisotropic, homogeneous and heterogeneous mediums. During the propagation of short waves, in the obtained solution, propagation effects in the structure are taken into account, as effective parameters strongly depend on the frequency of the field.

Keyword: heterogeneous medium, high-frequency field, electromagnetic waves, mathematical modeling, radio polarization method.

Title: Mathematical Modelling Of High-Frequency Field in Structurally-Heterogeneous Medium

Author: Nataliya Olali, Promice Mebine, Nataliya Zazimkо, Petro Malezhyk

International Journal of Mathematics and Physical Sciences Research  

ISSN 2348-5736 (Online)

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Abstract: Nowadays great attention has been devoted to the growth and characterization of pure and doped tartrate crystals with the aim to identify new materials for practical purposes. The effects of dopants on various properties of single crystals are of great interest for solid state science. Several applications of calcium   tartrate crystals are reported in the literature. In the present work, calcium tartrate crystals are grown by single diffusion gel method in the presence and in the absence of the magnetic field. The cell parameters are obtained from single crystal XRD analysis. The crystals are characterized by FTIR spectroscopy and UV spectroscopy. The influence of magnetic field on crystal stability is studied from Thermo gravimetry analysis(TGA) and differential scanning calorimetry (DSC) analysis. This study reveals the locking of water molecules in the lattice with different strengths .The decomposition is observed from the endothermic peaks of  DSC.

Keywords: organometallic compounds; Crystal growth; DSC; TGA; X-ray diffraction; optical properties.

Title: Structural, Optical and Thermal Characterization of Calcium Tartrate Crystal Grown Under the Influence of Magnetic Field

Author: R.G. VIDHYA, R. RAMASAMY, L. VIJAYALAKSHMI

International Journal of Mathematics and Physical Sciences Research

ISSN 2348-5736 (Online)

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Abstract: Aluminium foam due to its low specific weight and high stiffness to bending ratio is an adequate structural material however its compressive strength is low in comparison to its counter parts. Hence in this research work an attempt was made to enhance the compressive strength of aluminium foam which was prepared by melt route method by different addition of nickel particles. The objective of this paper is to deliver a better quality of foam, made of aluminium with low relative density and higher strength against compression. This material can be applicable where energy absorption and light weight property is heavily required such as automotive industries. Different compositions are used to find out the best conditions of producing better quality aluminium metal foam. Nickel particles were added directly to molten aluminium and different samples of 30x30x30 mm size with different percentage of nickel particles by weight were prepared. Compressive strength testing of different of these samples was performed on universal testing machine with maximum load of 400KN and pace rate of .001KN/sec. The result of compression test was compared with pure aluminium foam samples and thus the effect of percentage of nickel particles on compressive strength of aluminium foam was examined. Energy absorption of different samples of aluminium foam was also determined from stress strain diagrams generated during compression test.

Keywords: Aluminium foam, Compressive strength.

Title: Compressive Behaviour of Aluminium Foam Prepared By Melts Route Method by Different Addition of Nickel Particles

Author: Arun Negi, Virendra Singh Rana, Dashrath Singh Kathait, Himanshu Painuly

International Journal of Mathematics and Physical Sciences Research

ISSN 2348-5736 (Online)

Research Publish Journals