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Organic micro-pollutant removal in liquid-phase using carbonized silk cotton hull

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Journal of Environmental Sciences 2008年第9期20卷 1046-1054页

作者： M Sathishkumar A r Binupriya D kavitha r Selvakumar k k Sheema J G Choi Department of Food Science and Technology Institute of Agricultural Science and Technology Chonbuk National University Department of Chemical Engineering Yonsei University Department of Biotechnology Bharathiar University Department of Plant biology and Biotechnology Government Arts College National Agricultural Products Quality Management Services

Phenolic compounds constitute one of the major pollutants in the modern world. Although many physical and chemical treatment technologies for their removal exist, most of them are economically not feasible. The present study was aimed at using silk cotton hull, a potent agricultural waste as an adsobent for removal of 2,4-dichlorophenol (2,4-DCP), which was used as a model phenolic compound. The process parameters were investigated and optimized conditions were determined. The equilibrium time was found to ...

关键词： silk cotton hull carbon adsorption 2 4-DCP temperature kinetic study

GaN based transfer electron and avalanche transit time devices

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Journal of Semiconductors 2012年第5期33卷 32-37页

作者： r.k.Parida A.k.Panda ITEr Siksha‘O’Anusandhan University National Institute of Science and Technology

A new model is developed to study the microwave/mm wave characteristics of two-terminal GaNbased transfer electron devices（TEDs）,namely a Gunn diode and an impact avalanche transit time（IMPATT） *** characteristics such as device efficiency and the microwave power generated are computed and compared at D-band（140 GHz center frequency） to see the potentiality of each device under the same operating *** is seen that GaN-based IMPATT devices surpass the Gunn diode in the said frequency region.

关键词： GaN transfer electron device avalanche transit time device

A two-parameter multiple shooting method and its application to the natural vibrations of non-prismatic multi-segment beams

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Applied Mathematics and Mechanics(English Edition) 2023年第12期44卷 2243-2252页

作者： r.HOŁUBOWSkI k.JArCZEWSkA Faculty of Civil Engineering Wroc law University of Science and TechnologyWroc law 50-370Poland

This paper presents an enhanced version of the standard shooting method that enables problems with two unknown parameters to be solved.A novel approach is applied to the analysis of the natural vibrations of Euler-Bernoulli *** proposed algorithm,named as two-parameter multiple shooting method,is a new powerful numerical tool for calculating the natural frequencies and modes of multi-segment prismatic and non-prismatic beams with different boundary *** impact of the axial force and additional point masses is also taken into *** to the fact that the method is based directly on the fourth-order ordinary differential equation,the structures do not have to be divided into many small elements to obtain an accurate enough solution,even though the geometry is very *** verify the proposed method,three different examples are considered,i.e.,a three-segment non-prismatic beam,a prismatic column subject to non-uniformly distributed compressive loads,and a two-segment beam with an additional point *** analyses are carried out with the software *** results are compared with the solutions computed by the commercial finite element program *** agreement is achieved,which confirms the correctness and high effectiveness of the formulated algorithm.

关键词： two-parameter multiple shooting method two-point boundary value problem natural vibration non-prismatic beam multi-segment beam

Barut-Girardello and Gilmore-Perelomov coherent states for pseudoharmonic oscillators and their nonclassical properties: Factorization method

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Chinese Physics B 2013年第8期22卷 421-428页

作者： M k Tavassoly H r Jalali Atomic and Molecular Group Faculty of Physics Yazd UniversityYazd Iran Photonics research Group Engineering Research Center Yazd UniversityYazd Iran The Laboratory of Quantum Information Processing Yazd UniversityYazd Iran

In this paper we try to introduce the ladder operators associated with the pseudoharmonic oscillator, after solving the corresponding Schrrdinger equation by using the factorization method. The obtained generalized raising and lowering operators naturally lead us to the Dirac representation space of the system which is much easier to work with, in comparison to the functional Hilbert space. The SU（1, 1） dynamical symmetry group associated with the considered system is exactly established through investigating the fact that the deduced operators satisfy appropriate commutation relations. This result enables us to construct two important and distinct classes of Barut-Girardello and Gilmore-Perelomov coherent states associated with the system. Finally, their identities as the most important task are exactly resolved and some of their nonclassical properties are illustrated, numerically.

关键词： pseudoharmonic oscillator factorization method Barut-Girardello coherent states Gilmore-Perelomov coherent states nonclassical properties

Integrated search technique for parameter determination of SVM for speech recognition

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Journal of Central South University 2016年第6期23卷 1390-1398页

作者： Teena Mittal r.k.Sharma Department of Electronics and Communication Engineering Thapar University Department of Computer Science and Engineering Thapar University

Support vector machine(SVM)has a good application prospect for speech recognition problems;still optimum parameter selection is a vital issue for *** improve the learning ability of SVM,a method for searching the optimal parameters based on integration of predator prey optimization(PPO)and Hooke-Jeeves method has been *** PPO technique,population consists of prey and predator *** prey particles search the optimum solution and predator always attacks the global best prey *** solution obtained by PPO is further improved by applying Hooke-Jeeves *** method is applied to recognize isolated words in a Hindi speech database and also to recognize words in a benchmark database TI-20 in clean and noisy environment.A recognition rate of 81.5%for Hindi database and 92.2%for TI-20 database has been achieved using proposed technique.

关键词： support vector machine (SVM) predator prey optimization speech recognition Mel-frequency cepstral coefficients wavelet packets Hooke-Jeeves method

EXPErIMENTAL AND NUMErICAL ANALYSIS OF LAMINAr AND LOW TUrBULENT FLOW DISTrIBUTIONS IN INLET DIVIDING HEADEr OF SHELL AND TUBE HEAT EXCHANGEr

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Journal of Hydrodynamics 2010年第4期22卷 494-502页

作者： kANNAN k. rUDrAMOOrTHY r. Department of Production Engineering PSG College of Technology

Flow distribution headers play a major role in heat *** selection of header diameter,branch pipe diameter,branch pipe spacing *** based on the designer＇s experience and general guide *** proper selection of the header dimensions will yield uniform flow distribution in heat exchangers,which in turn will enhance the heat exchanger *** this work,the flow distribution in branch pipes and the pressure variation across the branch pipes in laminar and low turbulence region is studied with two models of the inlet dividing *** the numerical analysis has been applied,its inability to predict the no flow condition through the branch pipes is *** results are presented in the form of flow rate ratio through branch pipes and nondimensional coefficients across branch pipes which are useful to apply the existing mathematical models for the present experimental setup.

关键词： shell and tube heat exchanger inlet dividing header uniform flow distribution experimental setups numerical analysis

Activator-assisted electroless deposition of copper nanostructured films

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International Journal of Minerals,Metallurgy and Materials 2014年第2期21卷 196-203页

作者： Varsha r. Mehto r. k. Pandey Department of Physics Barkatullah University NIIT University

This paper showed simple and effective synthesis of copper nanoparticles within controlled diameter using direct electroless deposition on glass substrates, following the sensitization and activation steps. Electroless-deposited metals, such as Cu, Co, Ni, and Ag, and their alloys had many advantages in micro- and nanotechnologies. The structural, morphological, and optical properties of copper deposits were characterized using X-ray diffraction （XrD）, atomic force microscopy （AFM）, and UV-Vis spectroscopy. The structural data was further analyzed using the rietveld refinement program. Structural studies reveal that the deposited copper prefers a （111） orientation. AFM studies suggest the deposited materials form compact, uniform, and nanocrystalline phases with a high tendency to self-organize. The data show that the particle size can be controlled by controlling the activator concentration. The absorption spectra of the as-deposited copper nanoparticles reveal that the plasmonic peak broadens and exhibits a blue shift with decreasing particle size.

关键词： nanostructured materials thin films copper electroless plating deposition

On certain new exact solutions of the Einstein equations for axisymmetric rotating fields

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Chinese Physics B 2013年第10期22卷 73-78页

作者： Lakhveer kaur r.k.Gupta School of Mathematics and Computer Applications Thapar University

We investigate the Einstein field equations corresponding to the Weyl-Lewis-Papapetrou form for an axisymmetric rotating field by using the classical symmetry method. Using the invafiance group properties of the governing system of partial differential equations （PDEs） and admitting a Lie group of point transformations with commuting infinitesimal generators, we obtain exact solutions to the system of PDEs describing the Einstein field equations. Some appropriate canonical variables are characterized that transform the equations at hand to an equivalent system of ordinary differential equations and some physically important analytic solutions of field equations are constructed. Also, the class of axially symmetric solutions of Einstein field equations including the Papapetrou solution as a particular case has been found.

关键词： Einstein equations symmetry analysis exact solutions

Flower-shaped CuO Nanostructures: Synthesis,Characterization and Antimicrobial Activity

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Journal of Materials Science & Technology 2013年第10期29卷 909-914页

作者： k.Mageshwari r.Sathyamoorthy PG & research Department of Physics Kongunadu Arts and Science College

In the present work, flower-like CuO nanostructures were synthesized by reflux condensation method without using any surfactants or templates. Structural analysis by X-ray diffraction （XrD）, Fourier transform infrared spectroscopy （FTIr） and raman studies revealed the formation of highly crystalline single phase CuO, exhibiting monoclinic structure. Morphological analysis by field emission scanning electron microscopy （FESEM） showed flower-shaped CuO hierarchical architecture made up of interpenetrating self-assembled nanosheets. Optical analysis by UV-Vis diffused reflectance spectra （DrS） exhibited considerable blue-shift in the optical band gap due to quantum confinement effect. Photoluminescence （PL） spectrum showed both UV as well as visible emissions. The antibacterial activity of flower-shaped CuO nanostructures were tested against gram-positive （Bacillus subtilis, Bacillus thuringiensis） and gram-negative （Salmonella paratyphi, Salmonella paratyphi-a, Salmonella paratyphi-b, Escherichia coil and Pseudomonas aeruginosa） bacteria. Also, the antifungal activity of CuO was investigated against Aspergillus niger, rhizopus oryzae, Aspergi/lus flavus, Cladosporium carrionii, Mucor, Penicilliurn notatum and Alternaria alternata. results demonstrate that the flower-shaped CuO nanostructures act as an effective antimicrobial agent against pathogenic bacteria and fungi.

关键词： CuO nanosheets Hierarchical X-ray diffraction Photoluminescence Antibacterial Antifungal