IOSR-JAP   Volume-1 ~ Issue-4 ~ July–August 2012

Abstract: The AC conduction mechanism of vacuum deposited Neodymium Oxide (Nd2O3) nano films with Aluminium top and counter electrodes were investigated at temperature range 302-528 K and within the thickness range 90-175 nm. The variations of capacitance (C) with frequency (0.06-50 kHz) at different temperatures were also observed. It was found that the capacitance was frequency dependent at all temperatures but almost independent in the high frequency range beyond 1 kHz. From the variation of dielectric loss (tanδ) with frequency it was seen that tanδ values decrease rapidly with frequency and attains a minimum value. The variation of C with T at various frequencies was also studied and was found that C almost remain constant almost upto 440 K and then increases sharply with temperature. At low frequencies C increases sharply with temperature. From the tanδ versus T characteristics at different frequencies it was observed that in the temperature range upto 460 K. tanδ almost remained constant but increased sharply with T at frequencies below 1 kHz or below. A non-linear variation of 1/C2 with voltage did not indicate the presence of Schottky barriers. Nd2O3 nano films show low capacitance density 0.0021 μF cm-2 and low dielectric loss 0.008 at 1 kHz and at 300 K. On account of stable properties, low dielectric loss and high dielectric constant the application of Nd2O3 nano films in electronic microcircuits will give promising result.
Keywords: AC conduction, activation energy, capacitance density, dielectric loss, dielectric constant

[1] D. Bloor and J.R. Dean J. Phys. C, Solid State Phys, 5, 1972, 1237.
[2] P. Deshmukh, P. Deshmukh and M. Chintamani, J. Phys. C., 14, 1981, 531.
[3] M. Langlet and F.D. Shannon, Thin Solid Film, 186, 1990, L1-L5
[4] H.T. Fulham and F.P. Roberts, Proc. 8th Rare Earth Res. Conf., TA Henrie and RE Lindotron (New York : Golden and Reach, Vol-I), 1970
[5] V.S. Dharmadhikari and A. Goswami, Thin Solid Films, 87, 1982, 119
[6] H.B. Lal J. Phys. C, 13, 1980, 3969
[7] A. Von Hippel, E.P. Gross, F.G. Telstia and A. Geller, Phys. Rev. 91, 1953, 568
[8] F. Argall and A.K. Joncher, Thin Solid Films, 2, 1968, 185
[9] H.J. Birey, J. Appl. Phys., 49, 1978, 2898
[10] T. Tsutsumi, Jpn. J. Appl. Phys., 9, 1970, 735
[11] B. Bhushan, S.C. Kashyap and K.L. Chopra, J. Appl. Phys. 52, 1981, 2932

Abstract: Measurement of radon, thoron concentration and their daughter products in a dwelling of Rampur city and in the surrounding villages were carried out by using Solid-state nuclear track detectors (LR-115 type II) in a bare mode. The detectors were distributed over 32 houses. The indoor radon concentration was found to vary with building material, ventilation condition, occupant's behaviour and mode of constructions of houses. The radon value was found to be lower than recommended value under normal ventilation condition. The indoor radon concentrations were found to vary from 30 Bqm-3 to 85.36Bqm-3 with an average value of 62.36 Bq/m3.This value is lower than the ICRP recommended values of 200Bqm-and thus are within safe limits. The outdoor radon concentration is usually low and less than average indoor levels. It is also found that, in general, the radon level in lower floors is higher than that in upper ones in all houses.
Key Words: Indoor radon concentration, SSNTD's, Annual Effective Dose, Uttar Pradesh, environment.

[1]. Stephen Chong KetMin, Annie Tan Soo Lian, and Ng Ti Lik, "Radon review and indoor survey Singapore- Introduction: Natural source of radiation," from http:// home.pacific.net.sg, (1995).
[2]. Muramatsu H, Tashiro Y, Hasegawa N et al. Seasonal variations of Rn-222 concentrations in the air of a tunnel located in Nagano city. J Environ Radioact 2002: 60 (3): 263-274.
[3]. Kies A,Biell A, Rowlinson L etal.Investigation of the dynamics of indoor radon and radon progeny concentration Environ Int 1996; 22:S889-S904.
[4]. Riley WJ, Gadgil AJ,Bonnefoys YC etal.The effect of steady winds on radon-222 entry from soil into house.Atoms Environ 1996; 30 (7) 1167-1176.
[5]. Alter H.W. and Fleischer R.L. "Passive integrating radon monitor for environmental monitoring". Health Physics 40,693 (1981)
[6]. Eappen K.P. and Mayya Y.S. Calibration factor for LR-115 type-II based radon thoron discriminating dosimeter. Radiation measurement 38 (2004) 5-14.
[7]. ICRP (1987) Lung Cancer Risk for Indoor Exposure to Radon Daughters. ICRP Publications 50.pergamon press, Oxford.
[8]. UNSCEAR (1982) Ionizing radiations: Sources and biological effects. United Nations Publication No.E.82.IX.8, New York.
[9]. ICRP (1993) International Commission for Radiation Protection. Protection against rado-222 at home and at work.ICRP Publication No.65 (Pergamon Press,Oxford).
[10]. Ramola R.C., Sandhu A.S., Singh S., and Virk H.S. (1988).Radon measurement in human environment using nuclear track etch technique.Nucl.Data Sci.Tech. JAERI, Japan, 1091-1094.

Abstract: The studies are carried out on OTA-C active filter using single OTA-C and multiple OTA-C filter . The multiple OTA-C filters have the advantage of tuning the floating inductor resulting in enhancement of gain and increase in cut-off frequency with increase in bias current. Different cases of tuning transconductance gm1, gm1, gm , and gm2 by changing the bias currents of multiple OTA 's are studied and results are discussed. The only one method of setting of gm1 gm1 greater than gmgm2 is an innovative in changing the cut off frequency as we have flexible tuning transconductances of gm1, gm1, gm and gm2 . Results are consistent and are encouraging in respect of tuning of transconductance with bias current under the condition of gm1 gm1 greater than gmgm2 . However an OTA-C active filter other than the studied criteria has the limitations in designing of filters.
Keywords: OTA Operational Transconductance Amplifier OTA-C Operational Transconductance Amplifier – Capacitance

[1] Achim Gratz "Operational Transconductance Amplifiers" http://Synth.Stromeko.net/diy/OTA.pdf.
[2] Prasant K. Mahapatra, Manjeet Singh and Neelesh Kumar "Realization of Active Filters Using Operational Transconductance Amplifier (OTA)" J. Instrum. Soc. India 35(1) 1-9
[3] Neha Gupta , Meenakshi Suthar, Sapna Singh, Priyanka Soni "Active Filter Design Using Two OTA based Floating Inductance Simulator" International Journal of VLSI & Signal Processing Applications, Vol.2,Issue 1, Feb 2012, (47-50), ISSN 2231-3133 (Online)
[4] Hwang.Y.S, Liu.S.I, Wu.D.S, Wu.Y.P "Table_based linear transformation filter using OTA-C techniques" Electronics LETTERS vol.30 No.24 pp,1-2.,1994.
[5] A.M Soliman, "A Grounded Inductance Simulation Using the DVCCS/DVCVS", Proc. IEEE,Vol. 66 pp 1089-1091, Sep 1978.
[6] Y. Sun, Design of high frequency integrated analogue filters. London:IEE Press, 2002
[7] A.M Soliman, "A Grounded Inductance Simulation Using the DVCCS/DVCVS", Proc. IEEE,Vol. 66 pp 1089-1091, Sep 1978.
[8] A. Thanachayanon, "CMOS Floating Active Inductor and Its Applications to Bandpass Filter and Oscillator Design," lEE Proc. Circuits Devices Syst. , vol. 147, lEE, pp.. 42-48,2000.
[9] Koomagaew C, Petchmaneelumka W, Riewruja V, "OTA based Floating Inductance Simulator", ICCAS-SICE, pp 857-860, Aug. 2009.
[10] National Semiconductor, Application Note, LM 13600 Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers", Feb. 1995

Abstract: Optically transparent single crystals of doped metal ion KAP crystals were grown in aqueous solution by slow evaporation technique at room temperature. Optical absorption studies revealed that doped crystals possess in the visible region. Transparency of the doped crystal is suitable for (NLO) application and UV is compared with pure KAP crystal. The doped crystals present an absorption band at nearly 325nm and 340nm.the other properties of KAP such as refractive index was analyzed.
Keywords : Solubility, Growth from solutions, Single crystal growth ,Metalorganic , Non linear optic materials

[1] D.Chopra, Rev.Sci.Instrum.41 (1970) 1004
[2] Y.Okaya, Acta Crystallogr.19 (1965) 879
[3] S.Timpanaro, A.Sassella, A.Borghesi, W.Porzio, P.Fontaine, M.Goldmann, Adv.MATER. 13 (2001)127
[4] T.Haber, R.Resel, A.Thierry, M.Campione, A.Sassela, M.Moret, Physica E41 (2008) 133
[5] Y.Oaki, H.Imai, Chem.Commun.48 (2005) 6011
[6] 6 .N.Kejalakshmy, K.Srinivasan, J.Phys.D:Appl.Phys.36 (2003) 1778
[7] A.Miniewicz, S.Bartkiewicz, Adv.Mater.opt.EWlectron.2 (1993) 157
[8] .N.Kejalakshmy, K.Srinivasan, Opt.Mater.27 (2004) 389
[9] L.A.M.J.Jeten, B.Van der Hoek, W.J.P.Van Enckerort, J.Cryst.Growth 62 (1983) 603
[10] G.R.Ester, P.J.Halfpenny, J.Cryst.Growth 187 (1998) 111

Abstract: Landslides are one kind of slopes processes have been take place in some area at worldwide and Iran every year, and they are associated with damaged, many people are harmed and losses their properties. The aim of this research landslide hazard assessment in central zab basin in the southwest mountainsides of West-Azerbaijan province, Iran by using information layers and effective factors in landslide hazard such us: slope, aspect, litho logy, land use, distance to drainage, distance to road, distance to fault and precipitation using fuzzy set theory, images satellite from Landsat ETM + sensor in 2009 and PAN sensor with 5.6 meters in 2010 from IRS-1D satellite, SPOT 5 satellite images in 2008, and GIS. The classification was done with histogram trend changes and available classifications. Weighting variables classes were determined between 0–1 (profusion proportion). Fuzzification each one of effective factors using IDRISI software terminated and after was assigned type and shape membership function. In this research, used J-shape membership function and gamma fuzzy operator to obtain landslide hazard susceptibility. Different maps of gamma fuzzy operator values 0.8 and 0.9 to make ready for study area. Obtained maps accuracy was evaluated with use of quality sum index (QS). Models evaluation results were showed 0.9 operator in gamma fuzzy model had best accuracy in making landslide susceptibility mapping in study area.
Key words- Landslide, Fuzzy theory, J-shape membership function, Gamma fuzzy operator, central Zab basin

[1] H. J. Siddle, D. B. Jones, and H. R. Payne, Development of a methodology for landslip potential mapping in the Rhonda Valley. In Slope Stability Engineering, Developments and applications, Proc. Int. Conf. On Slope Stability, Isle of Wight, 15-18 April (Ed. R. J. Chandler), Thomas Telford, 1991, 137-148.
[2] E.M. Lee, J. C. Doorkamp, D. Brunsden, and N.H. Noton, Ground movement in Ventnor, Isle of Wight. Research Contract No. PECD 7/1/272. A report by Geomorphological Services Ltd for the department of environment, 1991.
[3] J.N. Hutchinson, and M. P. Chandler, A preliminary landslide hazard zonation of the under cliff of the Isle of Wight. In Slope stability engineering, development and applications. Proc. Int. Conf. On Slope stability, Isle of Wight, 15-18 April (Ed. R. J. Chandler), Thomas Telford, 1991, 197-206.
[4] A.T. Moon, R. J. Olds, R. A. Wilson, and B. C. Burman, Debris flow zoning at Montrose, Victoria. In Landslides, Proc. Sixth Int. Symp. On Landslides, February, Christchurch, New Zealand. A.A. Balkema, Rotterdam, The Netherlands, Vol. 2, 1992, 1015-1022.
[5] G. C. Morgan, G.E. Rawlings, and J. C. Sobkowicz, Evaluating total risk to communities from large debris flows. In Geotechnique and natural hazards. Proc. Geohazards '92 Symposium, BiTech Publishers, Canada, 1992, 225-236.
[6] E Leroi, Landslide hazard-Risk maps at different scales: objectives, tools and development. In Landslides, Proc. Int. Symp. On Landslides, Trondheim, 17-21 June (Ed. K. Senneset), 1996, 35-52.
[7] A Akgun, S. Dag, F. Bulut, Landslide susceptibility mapping for a landslide-prone area (Findikli, NE of Turkey) by likelihood frequency ratio and weighted linear combination models. Environment Geology, 54(6), 2007, 1127–1143.
[8] A Clerici Perego, S. Tellini, and C. Vescovi, A GIS-based automated procedure for landslide susceptibility mapping by the conditional analysis method: the Baganza valley case study (Italian Northern Apennines), Environment Geology 50, 2006, 941–961.
[9] W.R. Jibson, L.H. Edwin and A.M. John, A method for producing digital probabilistic seismic landslide hazard maps, Engineering Geology, 58, 2000, 271–289.
[10] C Baeza, J. Corominas, Assessment of shallow landslide susceptibility by means of multivariate statistical techniques. Earth Surface Processes and Landforms 26, 2001, 1251–1263.

Abstract: Strontium formate dihydrate and zinc doped strontium formate dihydrate crystals were grown by slow evaporation method. The optimized growth parameters for growing these crystals were determined. The effect of zinc doping on the physic-chemical properties of strontium formate dihydrate crystals was studied by EDAX, PXRD, FTIR and TGA studies. EDAX studies confirmed the entry of the zinc into the crystal lattice. XRD studies showed that the lattice volume of strontium formate dihydrate crystals increase with doping concentration. Thermogravimetric analysis results obtained showed that the grown crystals were dihydrate.
Keywords: zinc doping, strontium formate crystals, physico-chemical properties, optical transmittance

[1]. Cyrac Peter, M. Vimalan, P. Sagayaraj, J. Madhavan, Physica B, 405(2010) 65. [2]. Redrothu Hanumantharao, S. Kalainathan, Spectrochim. Acta, Part A, 94(2012) 78. [3]. G. Ramasamy, Subbiah Meenakshisundaram, J.Crys.Growth, 352(2012) 63.
[4]. Feliksinki T., Kolasinki W., Mat. Res. Bull., 17 (1982) 1557.
[5]. Deserno U., Haussuh S., IEEE J. Quantum Electronics, 8 (1972) 608.
[6]. J. Angel Mary Greena, X. Sahaya Shajan and S. Kumaresan, Intl. J. Mater. Sci., 5 (2010) 209.
[7]. N. Narasimlu, K. Sivakumar and G. Sivarama Sastry, Mater. Sci. Eng B, 1999, B57, 251.
[8]. Tokunosuke Watanabe, Masanori Matsui, Acta Crysta., B34 (1978) 2731.
[9]. Zhihong Jing, Chuancai Wang, Guangli Wang, Wenjuan Li, Dongmei Lu, J. Sol-Gel Sci. Tech 56 (1995)121.
[10]. Y.H. Kim, D.K. Lee, H.G. Cha, C.W. Kim, Y.S. Kang, J. Phys. Chem.C 111 (2007) 3629.

Abstract: This theory is an attempt to describe the universal phenomena like space, time, matter and energy as an inter-relationship bound by a newly discovered force named as the universal force. The universal force is shown to be the force of gravitation, electricity, magnetism, strong nuclear and weak nuclear forces. I believe any other force, hitherto fore not discovered; also, can be explained in terms of this universal force. Liberal use of wave-particle duality, relativity, quantum concepts is made to achieve a harmonious and comprehensive synthesis of all the existing beliefs in physics into a new theory with some new concepts added here and there. While adding new concepts, enormous care has been taken to ensure that the existing beliefs are not contradicted. Moreover, the new concepts are proved to be correct theoretically by deriving the constants like G, σ , etc.,
Keywords: Space, Time, Matter , Energy, Universal Force

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Abstract: Chitin nanofibers (CNF) are synthesized from shrimp cell chitin by stepwise purification and acid hydrolysis method. PMMA based polymer electrolytes complexed with LIN (CF3SO2)2 and chitin nanofibers as nanofiller have prepared by membrane hot-press technique. The prepared composite electrolytes are subjected to FT-IR, ac impedance, dielectric and modulus analyses. The incorporation of nanofiller in the polymer matrix increases the conductivity by an order of magnitude compared with filler free electrolytes. The complexation behavior of the composite polymer electrolytes are investigated by ATR FT -IR spectroscopy. The electric modulus analysis and dielectric studies of polymer electrolytes revealed that the non Debye dielectric relaxation nature.
Keywords: Chitin nanofiber, ac impedance, dielectric studies, electric modulus analysis

[1] J.R.Maccallum, C.A.Vincent (Eds.), Polymer electrolyte reviews (London, Elsevier Vol. I, 1989).
[2] F.M.Gray, Solid polymer electrolytes-Fundamentals and Technical applications (Germany, ACH, Weinheim, 1991).
[3] P.G. Bruce, Solid state electrochemistry (Cambridge, Cambridge University Press, 1995).
[4] A.Manuel Stephan, Review on gel polymer electrolytes for lithium batteries, Eur. Polym. J. 42, (2006) 21-42.
[5] A. Manuel Stephan, K.S.Nahm, T.Premkumar, M.Anbukulanthainathan, G.Ravi and J.Wilson, Nanofiller incorporated poly(vinylidene fluoride-hexafluoropropylene) (PVdF-HFP) composite electrolytesfor lithium batteries, J. Power Sources., 159, (2006) 1316-1321.
[6] H. H. Sumathipala, J. Hassoun, S. Panero and B. Scrosati, High performance PEO-based polymer electrolytes and their application in rechargeable lithium polymer batteries, Ionics, 13, (2007) 281–286.
[7] S.Ramesh and Liew Chiam Wen, Investigation on the effects of addition of SiO2 nanoparticles on ionic conductivity, FT-IR and thermal properties of nanocomposite PMMA-LiCF3SO3-SiO2, Ionics, 16, (2010), 255-262.
[8] P.M.Visakh and Sabu Thomas, Preparation of bionanomaterials and their polymer nanocomposites from waste and biomass, Waste Biomass Valor, 1, (2010) 121-134.
[9] K. Kanamura, T. Umegaki, S. Shriraishi, M. Ohashi, and Z. Takehara, Attenuation of aluminum current collector corrosion in LiTFSI electrolytes using fumed silica nanoparticles, J. Electrochem.Soc, 149, (2004) A228-A230.
[10] Rujira Dolphen and Paitip Thiravetyan, Adsorption of melanoidins by chitin nanofibers, Chem. Eng.J. 166, (2011) 890–895.