IOSR-JAP   Volume-7 ~ Issue-6 ~ Nov-Dec 2015

ABSTRACT: Energy transfer and migration from Coumarin343 to Rhodamine6G in Poly(methylmethacrylate) have been investigated using steady-state and time domain fluorescence spectroscopy. It is found that the influence of energy migration on energy transfer can be described quite convincingly on the basis of theories of Loring, Anderson and Fayer(LAF) and Huber. At higher acceptor concentrations direct donor-acceptor transfer occurs through Förster mechanism. It is suggested to use a mixture of these two dyes in the LSCs.
Keywords: Energy transfer, Energy migration, luminescent solar concentrators

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ABSTRACT: In this work, Titanium oxide thin films doped with different concentration of CuO (0,5,10, 15,20) %wt were prepared by pulse laser deposition(PLD) technique on glass substrates at room temperature with constant deposition parameter such as : pulse (Nd:YAG), laser with λ=1064 nm, constant energy 800 mJ , repetition rate 6 Hz and No. of pulse (500). The structure , optical and electrical properties were studied . The results of X-ray diffraction( XRD) confirmed that the film grown by this technique have good crystalline tetragonal mixed anatase and rutile phase structure, The preferred orientation was along (110) direction for Rutile phase. The optical properties of the films were studied by UV-VIS spectrum in the range of (360-1100) nm.

[1] H. M. Smith and A. F. Turner, ―Vacuum Deposited Thin Films Using a Ruby Laser,‖ Appl. Opt. 4(1), 147 ,1965. [2] R. Eason,Plused laser deposition of thin films, A JOHN WILEY & SONS, INC., PUBLICATION (2007).

[3] D. B. Chrisey and G. K. Hubler (editors), ―Pulsed Laser Deposition of Thin Films‖, John Wiley & Sons Inc., New York, 1994.

[4] P. Boffetta, V. Gaborieau, L. Nadon, M-E Parent, E. Weiderpass, J. Siemiatycki, Exposure to titanium dioxide and risk of lung cancer in a population-based study from Montreal , Scand J Work Environ Health 2001;27(4):227—232

[5] C. Garzella, E. Comini, E. Tempesti, C. Frigeri, and G. Sberveglieri, [TiO2 thin films by a novel sol-gel processing for gas sensor applications], Sensors and Actuators B: Chemical 68 ,189-196,2000.

[6] K. R. Al-Rawi, S. Kh. Taha, The Effect of nano particles of TiO2-Al2O3 on the Mechanical properties of epoxy Hybrid nanocomposites, Baghdad Science Journal Vol.12(3),2015.

[7] Yoon K H, Choi W J and Kang D H. Photo electrochemical properties of copper oxide thin films coated on an n-Si substrate, Thin Solid Films 372: 250,2000.

ABSTRACT: Polymer nanocomposite of CuI-PVA/PEDOT: PSS has been prepared as solid layers by solution casting technique. The obtained polymer composite layers were irradiated with γ – rays at various doses to investigate the radiation effect on ac conductivity and dielectric permittivity in the frequency range of 0.1-100 KHz at different temperatures. The change in chemical interaction, morphology, and thermal properties was analyzed with the help of Fourier transform infrared spectroscope (FT-IR), Scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) techniques, respectively, before and after irradiation.

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ABSTRACT: Aim: The present study is devoted to evaluate the dose at different points defined on the patient using semiconducting diodes and thermoluminescence detectors to excute verification of the dose at these relevant points calculated by means of movement couch and Beam - Zones method of the Total Body Irradiation Technique.

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ABSTRACT: Complete combustion of fuel does not take place due to lack of sufficient air-fuel mixing in the combustion chamber of vehicles. This happens due to stable structure of fuel. Incomplete combustion of fuel results in discharge of carbon monoxide, hydrocarbons, nitrogen oxides and fine particles through exhaust emissions causing environmental pollution. Magnetic field changes the structure of fuel which increases air-fuel mixing giving rise to increased combustion of fuel.Number of experiments to reduce pollutants in exhaust emission by applying magnetic field are performed and are available in literature. Present work is a comparative study of some of such experiments.It includes the study of both petrol and diesel engines.

Keywords: Air-fuel mixing,Combustion,Hydrocarbons,Magnetic field,Stable structure.

[1] A. S. Faris, S. K. Al-Naseri, N. Jamal, R. Isse, M. Abed, Z.Fouad, A. Kazim, N. Reheem, A. Chaloob, H. Mohammad, H. Jasim, J. Sadeq, A. Salim, A. Abas, Effects of magnetic field on fuel consumption and exhaust emissions in two stroke engine, Energy Procedia, 18, 2012, 327-338

[2] Hejun Guo, Z. Liu, Y.Chen and R. Yao, A study of magnetic effects on the physicochemical properties of individual hydrocarbons, Logistical Engineering College, Chongqing 400042, P.R China (1994), 216-220.

[3] Farrag A. El Fatih, G. M. Saber, Effect of fuel magnetism on engine performance and emissions, Australian Journal of Basic and Applied Sciences, 4 (12), 2010 , 6354-6358

[4] P. Patel, G. Rathod and T. Patel, Effect of magnetic field on performance and emission of single cylinder four stroke diesel engine, IOSR Journal of Engineerin, .4 (5), (2014), 28-34

[5] Habbo A. R. A., Khalil R. A. and Hammoodi H. S., Effect of magnetizing the fuel on the performance of s.i.engine ,Al-Rafidain Engineering, 19 (6), (2011), 84-90

[6] V. Ugare, N. Bhave and S. Lutade, Performance of spark ignition engine under the influence of magnetic field, International Journal of Research in Aeronautical and Mechanical Engineering, 1 (3), (2013), 36-43

ABSTRACT: A vanadium pentoxide (V2O5) thin films were deposited cathodically on stainless steel substrate (SS304) using aqueous vanadium tri-chloride (VCl3) as source of vanadium. Morphological, structural, physical properties were studied using SEM, XRD and contact angle test. Morphological study revealed that there is decrease in diameter and increase in depth of micro-pores which tends to increase in specific area of the film and thus enhancement in electrochemical performance. Eventually due to ultrasonic weltering V2O5 thin film became more viable as electrode in supercapacitor. Also retention of micro-pores facilitated effective electrolytic transport. The specific capacitance estimated for film before ultrasonic weltering was 333 F/g and it had been increased to 397 F/g after ultrasonic weltering.

Keywords: V2O5 thin film, Micro-pores, Cathodic Electrodeposition, Ultrasonic Weltering, Super-capacitive Performance.

[1] Pai Lua, Dongfeng Xuea,b∗, Hong Yangc and Yinong Liuc, International Journal of Smart and Nano Materials, 2013,Vol. 4, No. 1, 2–26.

[2] J. Liu, H. Xia, D. Xue, and L. Lu, J. Am. Chem. Soc. 131 (2009), pp. 12086–12087.

[3] B. E. Conway, Electrochemical Supercapacitors: Scientific, Fundamentals, and Technological Applications Kluwer, N.York(1999)

[4] Winter M. Brodd R.J. Chemical Reviews (2004)4245.

[5] Hae-Min Lee, Kangtaek Lee, Chang-Koo Kim,Materials 7(2014)265.

[6] H. Y. Lee, J. B. Goodenough, J Solid State Chem, 148 (1999) 81.

[7] B. Saravanakumar, K. K. Purushothaman, and G.Muralidharan, ACS Appl. Mater. Interfaces, 4 (2012) 4484.

ABSTRACT: Dementia is a neuro-communication disorder characterized by an impairment of the semantic memory responsible for processing meaning-related knowledge. The effect of dementia on semantic comprehension skill varies based on severity of dementia. In the same context, semantic memory has been described as the form of memory that allows humans to understand the meanings of words, objects, and events; to name and to produce meaningful statements; and to behave in a manner that reflects knowledge about the objects and events that exist in the environment. No standardized test has been documented till date for measuring semantic comprehension in dementia patients in Indian languages. With Bengali being the second widely spoken language in India (Census, 2001), the development and standardization of semantic comprehension test in Bengali was envised.

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ABSTRACT: West Asia including Arabian Peninsula, Syria, Iraq and Iran has been recognized as one of the most important primary sources of dust. During summer season, the dust usually driven by the north-westerly wind called Shamal wind which can impact land and people at great distance away where the dust finally settles. This study aims to characterize the dominated synoptic patterns in summer associated to four sever dust events during June, July, August and September for West Asia region extended from 24° to 40° N latitudes and 34° to 60°E longitude by analyzing the synoptic situation for the surface and the upper air level by using surface and upper air charts at 850 hPa, 10m wind speed and direction from ERA-I reanalysis data, and space-borne observations data from MODIS/Aqua and Terra.

[1] A.S. Goudie and N.J. Middleton, Desert dust in the global system (Springer, Berlin, Heidelberg, New York, 2006).
[2] T. A. Leski, A. P. Malanoski, M. J. Gregory, B. Lin, and D. A. Stenger, Application of a broad-range resequencing array for detection of pathogens kin desert dust samples from Kuwait and Iraq, Appl Environ Microbiol; 77(13), 2011,4285–4292.
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[4] T. T.Warner, Desert Meteorology (Cambridge University Press, 2004).
[5] J. Crook, Climate Analysis and Long Range Forecasting of Dust Storms in Iraq, M.Sc. thesis, Naval Postgraduate School, 2009.
[6] M. Hamidi, M.R. Kavianpour and Y. Shao, Synoptic analysis of dust storms in the Middle East, Asia-Pacific J. Atmos. Sci.,49 (3), 2013, 279-286. DOI:10.1007/s13143-013-0027-9.
[7] WMO, UNEP, Establishing a WMO sand and dust storm warning advisory and assessment system regional node for West Asia: current capabilities and needs, WMO Technical Report, 1121, 2013.
[8] H. Kutiel and H. Furman, Dust storms in the Middle East: sources of origin and their temporal characteristics, Indoor Built Environ 12, 2003, 419-426.

ABSTRACT: The Madden-Julian Oscillation (MJO) activity over Hyderabad (17.2oN, 78.2oE) a low latitude station is studied using two years of Radiosonde data of pressure (800hpa, 400hpa & 200hpa) from January 2013 to December 2014. This Radiosonde data is obtained from the University of Wyoming. The missing values of data are interpolated by linear interpolation method. These two years of data is divided into weeks in order to get weekly pressure profiles for the year 2013 and 2014 to study the MJO in the atmosphere of Hyderabad at 800hpa, 400hpa and 200hpa pressure. In conclusion, the frequency and wavelength of the oscillations found over Hyderabad's atmosphere is not matched with the MJO which indicates that MJO activity is not happening over the atmosphere of Hyderabad.

Keywords: Frequency, Madden Julian oscillation, Oscillation, Pressure, Radiosonde

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ABSTRACT: In the present study, two different methods of modification (Fullerene addition and plasma exposure) were applied to tune the basic optical properties and optical constants of the polystyrene films with thickness in the range (0.22-0.25 mm). The samples have been investigated via absorbance, transmittance and reflectance spectra, and characterized in the wavelength range 200–900 nm. The optical band gap Eg is found to be decreased after Fullerene addition while it is not changed with plasma exposure. The optical constants (refractive index, extinction coefficient, and real and imaginary parts of the dielectric constant) showed clear changes with Fullerene addition and plasma exposure.

Keywords: polystyrene/ fullerene/ plasma exposure/ optical constants/ optical band gap/ doping

[1] Alwan T J, Malaysian Polymer Journal, 2010, 5, 204.

[2] Deshmukh S H, Burghat D K, Shilaska S N and Deshmukh P T, Indian Journal of Pure & Applied Physics ,2008, 46, 344.

[3] El-Khodary A, Physica B: Condensed Matter, 2010, 405, 4301.

[4] Cheung R KY Fu, I T L, Mei Y F, Shek C H, Siu G G, Chu P K, Yang W M, Leng Y X, Huang Y X, Tian X B and Yang S Q, Nuclear Instruments and Methods in Physics Research, 2005, 237, 417.

[5] Kaczmarek Hand Chaberska H, Applied Surface Science, 2006, 252, 8185.

ABSTRACT: An analysis of the factors that influence the measurement errors of the four channel Young interferometer (YI) immunosensor are discussed and some possible techniques to reduce them are tested. Through the use of Matlab software, the effect of CCD camera resolution, Hanning window, and noise averaging on phase error (PE) and cross-talk (CT) is tested. It is shown that the increase of CCD camera resolution up to 2048 pixels reduces significantly PE and CT. Applying the Hanning window on the final interference pattern resulted effective in reducing the spectral leakage from the Fourier-transformed signal. With this method a reduction of PE and CT with an approximate factor of 5.2 was realized. The noise averaging method from signal overlapping was associated with the rapid reduction of PE and CT for up to 16 signals with an approximate factor of 7.58. A further increase in the number of overlaps impacted very little on PE and CT reduction.

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