IOSR-JAP   Volume-9 ~ Issue-3 ~ May-June 2017

ABSTRACT: In this unique experiment, where dust is produced in a sub-atmospheric pressure plasma formed between two parallel plate electrodes using a bipolar pulsed dc power supply as the source of power for plasma production, dust disappearance for few seconds is experimented. The plasma forming gas is a mixture of argon and acetylene. The plasma phase chemical reactions help in the formation of sub-micron dust particles that grow in size between two parallel electrodes. Using another single negative pulse, placed in between two electrodes, applied to another electrode, the dust particles can be disappeared for significant duration from the dusty plasma zone. The applied single pulse voltage is varied between 50-250 V. On the application of the pulse, in its initial phase, the dusty plasma gets disturbed and for some duration.........

Keywords: Dusty plasma, cogenerated, disappearance and reappearance

[1] Y. Kurimoto, N. Matsuda & G. Uchida et al. (2004) Thin Solid Films 457, 285
[2] Y.-F. Li, U. Konopka & K. Jiang et al. (2009) Appl. Phys. Lett. 94, 081502.
[3] C. M. Ticos, I. Jepu & C. P. Lungu et al. (2010) Appl. Phys. Lett. 97, 011501.
[4] R. A. Schill Jr., Laser Part. (2002) Beams 20, 341.
[5] K. B. Chai, W. Choe & C. R. Seon et al. (2010) Appl. Phys. Lett. 97, 201503.

ABSTRACT: PVDF (polyvinylidene fluoride) is a very well known material for converting mechanical energy into electrical energy and gold nanoparticle are versatile material for a broad range of applications with well characterized electronic and physical properties. In this work, we developed gold nanoparticle doped PVDF nanofiber based nanogenerators which are concurrently harvest light and mechanical energy into electrical energy. Here nanofiber has been made by electrospinning process. Characterization of fiber has been done by FE – SEM instrument , UV – VIS spectroscopy instrument and FTIR instrument. Beside this, characterization of film (Casted at 1200c) has also been done . For nanogenerator preparation ITO coated polyethylene terephthalate (PET) and silver fabric were used as electrodes..........

Keywords: PVDF, Nanogenerator, Energy harvesting, Electrospinning process, Gold nanoparticle.

[1]. Z. L. Wang , J. Song, Piezoelectric Nanogenerators Based on Zinc Oxide Nanowire Arrays, 2006 Science 312 242–6.
[2]. C. Chang, V. H. Tran , J. Wang , Y. K. Fuh, L. Lin, Direct-write piezoelectric polymeric nanogenerator with high energy conversion efficiency, 2010 Nano Lett. 10 726–31.

[3]. Y. Qi, N.T. Jafferis, K. Lyons, C. M. Lee, H. Ahmad, M. C. McAlpine, Piezoelectric ribbons printed onto rubber for flexible energy conversion. 2010 Nano Lett. 10 524–8.

[4]. Y. Yang, L. Lin, Y. Zhang, Q. Jing, T. C. Hou, Z. L. Wang, Self-powered magnetic sensor based on a triboelectric nanogenerator, 2012 ACS Nano 6 10378–83.
[5]. S. B. Lang, 2005, Pyroelectricity: From Ancient Curiosity to Modern Imaging Tool, Phys. Today 58 31–6.

ABSTRACT: This paper lists the restitution capacity of the spillway at different times and then shows by calculation that it is functioning properly. The Numerical modelling of the spillway was carried out using the HEC-RAS software of the US Army Corps of Engineers (USACE) and is limited to a single passage of 8.75m wide. The aim of the calculation is to obtain the flow conditions at the entrance of the restitution bucket where the water flow is at supercritical depth.

Keywords: Spillway, flood dissipation, cavitation, bucket, ski jump, Lom Pangar.

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ABSTRACT: Modulating optical resonances in plasmonic resonators were easily achieved by virtue of their constituent composition, size as well as shape. Such confinement of electric field in the nano-regime enhances extra-ordinarily the light-matter interaction, further enabling wide range of applications in nanophotonics, SERS etc. Herein, we compare and contrast the surface plasmon modes of Au nanospheres and nanostellates, the visibly distinct morphologies of which not only correlates exceptionally well with their structure-property functional relationships, but also articulate their respective growth mechanisms in a rather meticulous manner. Higher amplification of analyte Raman signals visibly demonstrates the increased number of hot-spots with reference to their surface morphology and roughness..

Keywords: Shape evolution, Plasmonic resonances, X-ray diffraction, SERS

[1]. C. Noguez, Surface Plasmons on Metal Nanoparticles:The Influence of Shape and Physical Environment, The Journal of Physical Chemistry C 111(10) (2007) 3806-3819.
[2]. M. Das, K.H. Shim, S.S.A. An, D.K. Yi, Review on gold nanoparticles and their applications, Toxicology and Environmental Health Sciences 3(4) (2012) 193-205.
[3]. C.G. Khoury, T. Vo-Dinh, Gold Nanostars For Surface-Enhanced Raman Scattering: Synthesis, Characterization and Optimization, The journal of physical chemistry. C, Nanomaterials and interfaces 2008(112) (2008) 18849-18859.
[4]. M. Verma, A. Kedia, M.B. Newmai, P.S. Kumar, Differential role of PVP on the synthesis of plasmonic gold nanostructures and their catalytic and SERS properties, RSC Advances 6(83) (2016) 80342-80353.
[5]. W. Niu, Y.A.A. Chua, W. Zhang, H. Huang, X. Lu, Highly Symmetric Gold Nanostars: Crystallographic Control and Surface-Enhanced Raman Scattering Property, Journal of the American Chemical Society 137(33) (2015) 10460-10463..

ABSTRACT: Acrylics are sometimes referred to as "plastic glass" which have not only captured the novelty trade for costume jewelry, pocketbooks, hairbrushes, umbrella handles, trays and ornaments, but also have found more practical purposes in many industrial and commercial products for everyday use.

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ABSTRACT: An nonlinear optical unidirectionnel <101> single Crystal of Praseodymium doped potassium dihydrogen orthophosphate (KDP) was grown by Sankaranarayanan-Ramasamy (SR) method. The <101> oriented seed Crystal were mounted at the bottom of the glass ampoules and the Crystal of 16 mm diameter, 150 mm length were grown by SR method. The unit cell parameters were confirmed by single Crystal X-ray diffraction analysis and it belongs to Tetragonal system with a space group of I42d. The laser damage threshold (LDT) was measured using Q-switched............

Keywords: Etching studies, Laser damage threshold, Mechanical properties, Single crystal growth, TEM

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ABSTRACT: Nano films of zinc selenide were deposited on well cleaned fluorine doped tin oxide (FTO) glass substrate using electrodeposition technique. The deposited films were optically, electrically and structurally characterized using M501 UV-visible spectrophotometer in the wavelength range of 300-900nm, MT345 four-point probe and X-ray diffractometer respectively. The experiments were carried out at room temperature (300K).The results show showed that zinc selenide is a direct band gap type semiconductor with band gap energy of 2.5eV and high refractive index value of 2.18-2.64. The deposited films exhibited a cubic structure with preferred orientation along (111) plane.............

Keywords: Nanofilms, FTO, Electrodeposition, four-point probe, XRD, grain size, bandgap energy dislocation density, micro-strain and refractive index

[1]. Bedir M, Oztas M, Bakkaloglu O. F and Ormanci R, (2005). Qouted by Kassim, A., Tee, T. W., Min, H. S., Monohorn, S., &Nagalingam, S. (2010). Effect of bath temperature on the chemical bath deposition of PbSe thin films. Kathmandu University Journal of Science, Engineering and Technology, 6(2), 126-132.
[2]. Gallian, A, Fedorov, VV, Mirov, SB, Badikov, VV, Galkin, SN, Voronkin, EF, Lalayants, AI: Hot-pressed ceramic Cr2+: ZnSe gain-switched laser. Opt Express 14(24), 11694 (2006)
[3]. Okereke, NA, Ekpunobi, AJ: ZnSe buffer layer deposition for solar cell application. Journal of Non-Oxide Glasses 3(1), 31 (2011)
[4]. Rao, CNR, Vivekchand, SRC, Biswas, K, Govindaraj, A: Synthesis of organic nanomaterials. Dalton Trans 34, 3728 (2007)
[5]. Hsiao, CH, Hung, SC, Chih, SH, Wang, SB, Cheng, YC, Huang, BR, Young, SJ, Chang, SJ: ZnSe/ZnSeTesuperlatticenanotips. Nanoscale Res Lett 5, 930 (2010)

ABSTRACT: Nanotechnology today is regarded as a revolutionary technology that can help address key needs relating to energy, environment, health, agriculture, electronics, textiles, construction, water treatment, food processing and cosmetics in developing countries. Most of these applications are very much relevant for a developing country like India. The government of India has been investing in nanotechnologies since 2001.Nanotechnology development in India is at a initial stage with policy initiatives directed towards promoting research and development. It is largely a government led initiative and industry participation is still emerging. This discussion paper attempts to capture the nanotechnology development in India by stressing the various initiatives taken by the government to promote basic R&D in it including global trends, the major factors involved and the state of regulatory framework existing in the country. the major challenges facing the adoption and diffusion of nanotechnology

Keywords: bulk matter, global trends, interdisciplinary, nano-scale, Nanotechnology.

[1] Nanotechnology development in India: building capability and governing the technology [TERI Briefing Paper], TERI 2010.
[2] The National Nanotechnology Initiative Strategic Plan, Nanoscale Science, Engineering, and Technology Subcommittee, National Science and Technology Council,The White House December 2007.

[3] A. Dhawan, V. Sharma and D. Parmar, Nanomaterials: A challenge for toxicologists, Nanotoxicology, 3, 2009,1-9.

[4] Koen Beumer and Sujit Bhattacharya, Emerging technologies in India: Developments, debates and silences about nanotechnology, Sci Public Policy, 40 (5), 2013, 628-643.
[5] S. Mazumder, D. Sarkar and I.K. Puri, Nanotechnology Commercialization: Prospects in India, Journal of Materials Science & Nanotechnology, 2 (2), 2014, 1-11..

ABSTRACT: Density and ultrasonic velocity have been measured in the binary liquid mixtures of methyl acetate (MA) and ethyl acetate (EA) in 2-methoxyethanol (2ME) over the temperature range from 303.15 to 323.15 K. The measured data are used to compute the excess thermodynamic parameters namely excess adiabatic compressibility (βs E), excess intermolecular free length (Lf E) and excess molar volume (VE). A plot of these excess thermodynamic parameters against the mole fraction of methyl acetate and ethyl acetate over the entire composition range shows a negative deviation indicating a strong interaction between the component molecules of liquid mixtures. The results are discussed in terms of formation of hydrogen bonding between the component molecules of the liquid mixtures..........

Keywords:ultrasonic velocity, excess adiabatic compressibility, excess free length, excess molar volume, hydrogen bonding.

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ABSTRACT: We have calculated the one loop QED corrections in 1s1/2 level for hydrogen like atoms for Z=1-92. The self energy (which now automatically contains the vertex correction) and the vacuum polarization corrections are calculated with finite size nucleus. The results are calculated using non relativistic and relativistic approaches. For light nuclei (Z=1-20) the two approaches give approximately the same results. For heavy nuclei (Z=20-92) the relativistic effect increases with increasing Z. The effect of finite size on the low energy part of self energy and the total energy shift is very small for light atoms and increases slowly with Z until Z=20 and begins to decrease until Z=80 and then increases for higher Z. The volume of the nucleus gives a large difference for high Z in the vacuum polarization and increases the vertex correction slowly with Z. The contribution of the shape of the density of light nuclei is very small.

Keywords:Self energy, vacuum polarization and vertex corrections; Point nucleus; Finite size nucleus; Hydrogen like atoms; 1s1/2 energy level.

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[5]. M. El- Shabshiry, S. M. E Ismaeel and M. M. Abdel-Mageed IOSR Journal of Applied Physics (IOSR-JAP) e-ISSN: 2278-4861. Volume 7, Issue 5 Ver. I (Sep.- Oct. 2015) pp60-66..

ABSTRACT: A theoretical investigation has been made of obliquely propagating electrostatic solitary structures in a magnetized dusty plasma, composed of negatively charged dust, nonthermal ions of distinct temperatures, and Boltzmann distributed electrons. The properties of small but finite amplitude dust-acoustic solitary waves (DASWs) in this dusty plasma system are studied by deriving the Zakharov-Kuznetsov (ZK) equation. It has been inferred that the effects of obliqueness, external magnetic field, nonthermal ions of two distinct temperatures, and Boltzmann electrons cause modification of the characteristics (i.e., amplitude and width) of these solitary structures. The implications of our present investigation in understanding the basic features of nonlinear electrostatic perturbations observed in many space plasma systems and laboratory devices are briefly discussed.

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ABSTRACT: Very Low Frequency (VLF) wave is the plasma wave in the magnetosphere with frequency range of 3 kHz to 30 kHz. The universal distribution properties of Very Low Frequency wave (VLF) in the magnetosphere and its interactions with energetic particles, such as the wave-particle resonance, modulation, and particle acceleration, are active topics in space physics research. These problems are fundamentally important issues to understand the energy transport from the solar wind into the magnetosphere. In this paper we briefly reviewed the recent research progress on VLF wave and its interactions with energetic particles in the inner magnetosphere; furthermore, we suggested some open questions for future study Keywords: Etching studies, Laser damage threshold, Mechanical properties, Single crystal growth, TEM.

Keywords: Pitch angle diffusion, Fokker-Planck equation, Chorus, Hiss.

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ABSTRACT: The ultraviolet absorption spectra of this molecules have been recorded in various solvents. Thermodynamic parameters such as total energy, zero-point energy, rotational constants dipole moment, thermal energy, specific heat and entropy of 5-Fluoro-1, 3-Dimethyl Uracil are calculated. The plots of thermodynamic parameters have been given in following paper.

Keywords: Ultraviolet absorption, thermodynamic parameters, 5-1,3FDMU etc.

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ABSTRACT: Theoretical geometric parameters (bond lengths, bond angles and dihedral angle ) were calculated using ab initio Hartree Fock (HF) and density functional B3LYP method with 6-31+G (d, p) and 6 31++G(d,p) basis set. Thermodynamic parameters such as total energy,zero-point energy, rotational constants dipole moment, thermal energy, specific heat and entropy of 2-amino-4-methoxy-6-methyl pyrimidine are calculated. The plots of thermodynamic parameters have been given in following paper.

Keywords: HF, DFT, 2,4,6-AMMP etc.

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