Vol. 7 & Issue 1 ; Section C : Physical Sciences

Date : Nov.2016 to Jan.2017

 

The Electrochemical Deposition of Apetite on Titanium and It’s Alloy

Aqeel Faleeh Hasan, Abdulhusain K. Elttayef, Jamal F. Hamodi

  • Abstract

    In this research we investigate the corrosion behavior of pure Ti and Ti6Al4V that coated with hydroxyapetite by electrodeposition from aqueous solution containing Ca(NO3)2.H2O =7gm/l , (NH4)2HPO4 =3.5 gm/l , Na(NO3)2 = 8 gm/l in order to improve the bonding strength of hydroxyapetite and medical metal and alloy and increasing the biocompatibility. The suitable conditions for coating such as potential ,temperature and solution pH was identified and confirmed and the coating layer morphology was investigated by XRD , Optical microscope and SEM tests, the corrosion tests was made by use synthesis simulated body fluid (SBF).

Prediction of Waterquality Parameter BOD Using Artificial Neural Network Techniques for the Manora Channel Karachi, Pakistan

Sidra Ghayas, Juniad Saghir Siddiquie and Asif Mansoor

  • Abstract

    Karachi sea port is highly significant for fisheries, tourism, shipping and trading and the water quality is suffered due to pollution and industrial waste. Present study from 1996 to 2014 was conducted. Different parameters such as BCO3, COD, pH, Cl, NH3, BOD and SO4 by using ANN models to predict the BOD. The BOD is predicted keeping other parameters as input. Outcomes reflected that a single layer four unit perceptron as a most significant model with hyperbolic tangent as the activation function in the hidden layer and sigmoid as the activation function for the output layer among seventeen different models. The coefficient of determination R2 and MAPE are observed to assess the goodness of fit and the efficiency of the model which are 0.926 and 0.044 respectively.

Refractive index, density, molar refraction and polarizability constant of substituted 2-oxo-2H-chromene-3-carbohydrazide derivatives in different binary mixture

P. P. Choudhari, D. S. Hedaoo, M. P. Wadekar

  • Abstract

    Refractive index of substituted 2-oxo-2H-chromene-3-carbohydrazide derivatives are determined by using Abbe’s refractometer. From the data of refractive index and density, molar refraction (Rm) and polarizability constant (a) are calculated. The calculated data is used to study the solute-solute, solute-solvent and solvent-solvent interaction in the system

An analytical study on Brain Injury due to an input rotational acceleration on skull-brain system of the Human head

Saktipada Nanda, Sibashis Nanda, Shreya Pramanik, Suman Kumari Sao, Swarasree Bhattacharyya

  • Abstract

    In the present analysis the effect of angular acceleration on the threshold of cerebral concussion is studied mathematically by considering the spherical geometry of the brain case. The skull is treated as a rigid spherical shell, the fluid representing CSF as a homogeneous, inviscid and compressible fluid with irrotational motion. The dissipative material behaviour of the brain matter (grey matter) is given due consideration in the investigation. The strain and stress distribution at various locations of the brain are presented graphically.

Theoretical Study of the Electronic Structure of Aluminum Nitrite Wurtzite (AlN) Nanocrystal Using Density Functional Theory Coupled with Large Unit Cell Method

Askander Khalid Kaka

  • Abstract

    The wurtzite structure reported here was studied by using the large unit cell (LUC) method. Some of the physical properties of Aluminum Nitrite (AlN) nanocrystal for 4, 8, 32, and 64 atoms per large unit cell are investigated. The lattice constant was shrinking with increasing the core size of the structure. Energy gap is increased with the increasing of the size of the LUC. The results were in good agreement compared with the experimental and theoretical calculations. The energy gap for both nanocrystal and bulk AlN become near as the size of the AlN nanocrystal becomes larger. The density of states dependency on the nanocrystal’s size also reported. The shape effect occurs in simulating the electron affinity and the ionization potential, which appears as a fluctuation in their values.The cohesive energy is decreasing with increasing of the core of atoms.

Effect of Gamma Radiation on the Mean Absorbance of a Synthetic Dye in Aqueous Solutions and Its Possible Use in Gamma Dosimetry

Muhammad Khawar Hayat, Ramiza, Taqmeem Hussain, Abdul Hanan Saeed, Inam ul Haq and Nasim Akhter

  • Abstract

    Radiation induced effects (RIEs) on the optical density (Absorbance (A)) of the aqueous solutions of Sandalfix Orange C2RL (SO) dye were studied when exposed to different γ-radiation doses. A UV/VIS spectrophotometer was used to scan the un-irradiated and irradiated sample solutions. The absorption peak (λmax) for the control sample solution was found at 430 nm. The change in λmax upon irradiation was observed. The mean absorbance (Ā) of the sample solutions was decreased linearly with respect to absorbed dose (D) for low dosimetry (0.1-1 kGy) range; while logarithmic decrease was observed for both intermediate and high dosimetry ranges i.e., 1-10 and 10-100 kGy, respectively

Determination of Parameter from Observation Containing itself and Chance Error: Central
Tendency of Annual Extremum of Ambient Air Temperature at Dhubri

Rinamani Sarmah Bordoloi and Dhritikesh Chakrabarty

  • Abstract

    An analytical method has been developed, by Chakrabarty in 2014, for determining the true value of the parameter from observed data in the situation where the observations consist of a single parameter chance error but any assignable error. The method has already been successfully applied in determining the central tendency of each of annual maximum and annual minimum of the ambient air temperature at Guwahati. This paper deals with the determination of the central tendency of each of annual maximum and annual minimum of the ambient air temperature at Dhubri by the same method. The study has carried out using the data since 1969 onwards 

The Performance of Solar Still Using Heating Pipe Evacuated Tubes at Basrah climate

Ahmed Sh. Sadiq and Ala’a A. Jassim

  • Abstract

    The performance of active double slope solar still using heating pipe evacuated tube was studied theoretically and compared with the experimental result relative to Basrah climate. These tests were extended for the period of January to August 2013; a computer program was used to calculate the water productivity and other parameters such as heat transfer coefficient and heat flux of the system theoretically then compared with the experimental results relative to local Basrah climate. The results showed the water productivity has increased with the increasing of solar intensity and wind velocity. On1st July 2013, the water productivity of the solar still system with evacuated tubes has about 11.23 kg for the period between 800: AM to 17:00 PM. The values results of system with evacuated tubes have compared with the conversional solar system. The results show the value of water productivity has increased about 43.5%.

Rotational Fine Structure of Pure Oxygen Spectrum at 1270 nm Band

Muhammad A. AL-Jalali

  • Abstract

    Experimental results were deduced from pure oxygen spectrum at 1270 nm band under pressures (1, 2,3,4,5,8,10,15,20,25 bar) at 298 K. At high pressures, spectral lines are broadening enough to make merge or overlap between nearest neighbors’ lines. Oxygen spectral lines may be separated to two ro-vibrational envelopes, the first belongs to O2 dimol, which has a broadening envelope with a central peak near 1264 nm, and the second belongs to O2 monomer, its peak centered near 1268 nm and has a narrowing envelope. Data analysis shows that pure rotational lines inside each envelope are very close to each other without interfering, where pressure effects oblige rotational lines to emigrate and pile up at the gravity center of the envelopes.

Pressure Broadening and Narrowing in Pure Oxygen Absorption Spectrum at 1270 nm Band:      part I

Muhammad A. AL-Jalali and Yahia M. Mahzia 

  • Abstract

    Experimental measurements of pure oxygen absorption spectrum at 1270 nm band were analyzed by advanced nonlinear curve fitting method. This method gave two envelopes, the first arises from O2 dimol and consists of a wide envelope centered near 1264 nm, while the second arises from O2 monomer spectrum centered near 1268 nm. The first nearly subjects to the collision-induced absorption (CIA), where the pressure broadening will prevail, but the second subjects to the pressure narrowing or Dicke effect. Applicable pressures were varied from 1 to 25 bar and temperature equals to 298 K. Gaussian width was fixed, Lorentzian width, Voigt full width at halfmaximum height (Voigt FWHM) for each spectral line were calculated by Voigt deconvolution method.

Two-dimensional discrete particle simulation of Townsend gaseous discharge in a micrometer-scale plasma reactor

Saurav Gautam, Abinish Kumar Dutta, Deepak Prasad Subedi

  • Abstract

    Townsend discharge is a multistage gas ionization process that causes a non-conducting gas to become conductive due to an avalanche multiplication of free electrons under acceleration due to an electric field. In this paper, we discuss the methodology and results of a sub-millimeter scale two-dimensional particle simulation of Townsend discharge. Because of the virtually insuperable computational requirements of ordinary-scale particle simulation, almost all the models so far have relied upon particle-in-cell and fluid modeling methods. For computational ease, we have considered 10,000 molecules in a scaled down chamber and simulated the results of electric breakdown under an applied electric field. We have assumed a reasonable 0.001% of these to be already ionized due to background entities like cosmic rays and UV rays from the Sun. Results of this simulation have been found to be closely similar to those predicted by the Townsend theory of gaseous discharge. The concepts used in the simulation and subsequent observations are discussed.

Pressure Broadening and Narrowing in Pure Oxygen Absorption Spectrum at 1270 nm Band:    part II

Muhammad A. AL-Jalali  and Yahia M. Mahzia 

  • Abstract

    Oxygen absorption spectrum at 1270 nm band may be analyzed to two overlapping bands, and they appear as two different transitions because of collision-induced absorption (CIA) contribution, the first arises from O2 monomer and its center near 1268 nm, while the second arises from O2 dimol and has an asymmetric profile with a wide continuum absorption band centered near 1264 nm. Experimental results of oxygen absorption spectral lines at 1270 nm band were subjected to deep analysis under a wide range of pressures extend from 1 to 25 bar, and different temperatures 323 K, 348 K, and 373 K. Pressure broadening prevails at 1264 nm band, whereas pressure narrowing predominates at 1268 nm band

Chemically deposited CdS thin film and its photoelectric performance

Narayana Swamy T N, Pushpalatha H L, Ganesha R

  • Abstract

    Cadmium sulfide (CdS) thin films are deposited on fluorine doped tin oxide (FTO) glass substrates at 80℃, 11pH by simple chemical bath deposition (CBD). The deposited thin films are characterized by X-ray diffraction (XRD), UV-VIS spectroscopy, scanning electron microscopy (SEM) surface wettability test, photo electrochemical study (PEC) and electrochemical impedance spectroscopy (EIS). The XRD study reveals the single phase cubic structure of CdS thin film. The optical study showed the direct band gap of 2.44 eV from the transmission data of UV-Vis spectroscopy. The surface morphology exhibits spongy agglomerated flakes- like morphology. The hydrophilic nature of the CdS thin film was observed from surface wettability test. The PEC study confirms the photo activity of the deposited film and EIS study gives the interpretation of carrier transportation through the interface in the fabricated PEC cell in light and dark.

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