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Sankar, S.,Sharma, S.K.,Kaur, N.,Lee, B.,Kim, D.Y.,Lee, S.,Jung, H. Ceramurgica ; Elsevier Science Ltd 2016 CERAMICS INTERNATIONAL Vol.42 No.4
An inexpensive chemical method was used to synthesize biogenic mesoporous silica (m-SiO<SUB>2</SUB>) from rice husk ash (RHA). A comparative study was carried out to produce silica nanoparticles (S-SiO<SUB>2</SUB>, R-SiO<SUB>2</SUB>, and B-SiO<SUB>2</SUB>) from three type of rice husk ashes (sticky, red, and brown). The microstructure of m-SiO<SUB>2</SUB> was dependent on the geographical provenance and the types of RHA. An analysis of the SEM and TEM micrographs reveals that the S-SiO<SUB>2</SUB> nanoparticles had a clustered spherical shape, while R-SiO<SUB>2</SUB> and B-SiO<SUB>2</SUB> nanoparticles were found to be purely spherical. The average crystallite size of S-SiO<SUB>2,</SUB> R-SiO<SUB>2</SUB> and B-SiO<SUB>2</SUB> nanoparticles evaluated from the TEM measurements were observed to be 50, 20 and 10nm, respectively. The XRD pattern of silica nanopowders had an absence of sharp peaks that confirmed the amorphous nature of the material. The Fourier transform infrared (FTIR) spectra of silica nanoparticles showed the symmetric Si-O and O-Si-O stretching bond vibrations at 462, 1088, and 1098cm<SUP>-1</SUP>. The surface area of S-SiO<SUB>2,</SUB> R-SiO<SUB>2</SUB> and B-SiO<SUB>2</SUB> nanopowders was measured to be 7.5513, 201.45, and 247.18m<SUP>2</SUP>g<SUP>-1</SUP>, respectively. The surface area of uniformly-distributed spherical nanoparticles of B-SiO<SUB>2</SUB> was observed the highest, which can be applied for the application of energy storage and drug delivery systems.
Kumar, S.,Lim, W.,Lee, Y.,Yadav, J.S.,Sharma, D.,Sharma, V.K.,Moon, I. Elsevier 2010 Journal of molecular liquids Vol.155 No.1
Speeds of sound data, u<SUB>ijk</SUB> of 1,3-dioxolane or 1,4-dioxane(i)+benzene or toluene (j)+formamide or N,N-dimethylformamide (k) ternary mixtures and their sub-binary mixtures, u<SUB>ij</SUB> of 1,3-dioxolane or 1,4-dioxane (i)+benzene or toluene or formamide or N,N-dimethylformamide (j); benzene or toluene (i)+formamide or N,N-dimethylformamide (j) have been measured using a quartz crystal interferometer as a function of composition at 308.15K. The experimental data have been utilized to evaluate excess isentropic compressibilities of binary, (κ<SUB>S</SUB><SUP>E</SUP>)<SUB>ij</SUB> and ternary, (κ<SUB>S</SUB><SUP>E</SUP>)<SUB>ijk</SUB> mixtures and the same have been fitted to Redlich-Kister equation to predict binary and ternary adjustable parameters along with standard deviations. (κ<SUB>S</SUB><SUP>E</SUP>)<SUB>ij</SUB> and (κ<SUB>S</SUB><SUP>E</SUP>)<SUB>ijk</SUB> data have also been analyzed in terms of Graph and Flory theories. It has been observed that predicted (κ<SUB>S</SUB><SUP>E</SUP>)<SUB>ij</SUB> and (κ<SUB>S</SUB><SUP>E</SUP>)<SUB>ijk</SUB> values by Graph theory compare well with their corresponding experimental values.
IN INTEGRAL TRANSFORM INVOLVING TWO GENERALISED H-FUNCTIONS
Sharma, S.D. Department of Mathematics 1979 Kyungpook mathematical journal Vol.19 No.1
In the present paper we study a new integral transform whose kernel involves the product of two H-functions of two complex variables. Next, we establish an inversion formula for this new transform. On account of very general nature of its kernel, several other integral transforms studies earlier by many research workers viz., Bose (1952), Mukherji (1962), Nigam (1963), Rathie (1965), Singh (1969), Mittal & Goel (1973), and Gupta, Garg & Kalla (1975), follow as its particular cases.
Sharma, S.K.,Kaur, N.,Lee, B.,Kim, C.,Lee, S.,Kim, D.Y. Elsevier 2015 CURRENT APPLIED PHYSICS Vol.15 No.suppl2
Well-aligned Y-doped ZnO (YZO) nanorod arrays were synthesized on YZO-seeded quartz glass substrates by hydrothermal method. The diameter and the density of the YZO nanorods were effectively controlled by modifying the grain morphology of the seed layer. The microstructures of the seed grains were manipulated by vacuum annealing (300-800 <SUP>o</SUP>C), and the texture of the seed grains significantly affected the physical properties of the YZO nanorods. From analyses of microstructural and optical properties of the YZO nanorods, the size and the density of the YZO nanorods were observed to strongly depend on those of the seed grains that could be controlled by annealing temperatures. The simple and scalable method proposed here could be beneficial for the controllable growth of vertically-aligned YZO nanorod arrays and their nano-device fabrications.
Salen decorated nanostructured ZnO chemosensor for the detection of mercuric ions (Hg<sup>2+</sup>)
Sharma, S.K.,Kaur, N.,Singh, J.,Singh, A.,Raj, P.,Sankar, S.,Kim, D.Y.,Singh, N.,Kaur, N.,Singh, H. Elsevier Sequoia 2016 Sensors and actuators. B Chemical Vol.232 No.-
Self-assembled ZnO nanoparticles, nanodumbbells and nanorod/nanowire flowers were synthesized by the hydrothermal precipitation method, and tested them for the detection of mercuric ions (Hg<SUP>2+</SUP>) as the chemosensor. Various techniques like X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM) and photoluminescence (PL) were employed for the characterization of nanostructured ZnO powder. The surface of nanostructured ZnO was decorated with salen prepared from reported procedure. The binding ability of different nanostructured ZnO complexes with salen was tested by screening them with various metal ion solutions. The prepared solution of various ZnO complexes showed the selective affinity for mercuric ions, without having any interference from other potential interferent metal ions. The prepared complexes had a variable response and the selectivity for mercury ions, having the lowest detection limits of 20nM (nanoparticle), 18nM (nanodumbbell), 35nM (nanorod flowers) and 10nM (nanowire flowers), respectively. The detection limit/range of prepared complexes was varied with respect to the microstructures: (i) nanoparticles showed a larger dynamic range as they had more binding sites for Hg<SUP>2+</SUP> owing to more binding sites for salen, and (ii) the nanowire flowers detected the better detection limit due to its cluster nature.
A Reproducible High Etch Rate ICP Process for Etching of Via-Hole Grounds in 200 ㎛ Thick GaAs MMICs
D. S. Rawal,Vanita R. Agarwal,H. S. Sharma,B. K. Sehgal,R. Muralidharan 대한전자공학회 2008 Journal of semiconductor technology and science Vol.8 No.3
An inductively coupled plasma etching process to replace an existing slower rate reactive ion etching process for 60 ㎛ diameter via-holes using Cl2/BCl3 gases has been investigated. Process pressure and platen power were varied at a constant ICP coil power to reproduce the RIE etched 200 ㎛ deep via profile, at high etch rate. Desired etch profile was obtained at 40 mTorr pressure, 950 W coil power, 90W platen power with an etch rate ~ 4 ㎛/min and via etch yield >90% over a 3-inch wafer, using 24 ㎛ thick photoresist mask. The etch uniformity and reproducibility obtained for the process were better than 4%. The metallized via-hole dc resistance measured was ~ 0.5 Ω and via inductance value measured was ~ 83 pH.
Generalized `Useful' Information Generating Functions
D.S.Hooda,D.K.Sharma 한국전산응용수학회 2009 Journal of applied mathematics & informatics Vol.27 No.3
In the present paper, one new generalized `useful' information generating function and two new relative `useful' information generating functions have been defined with their particular and limiting cases. It is interesting to note that differentiations of these information generating functions at t=0 or t=1 give some known and unknown generalized measures of useful information and `useful' relative information. The information generating functions facilitates to compute various measures and that has been illustrated by applying these information generating functions for Uniform, Geometric and Exponential probability distributions.
Prevalence of Phytophthora Blight of Pigeonpea in the Deccan Plateau of India
Sharma, M.,Pande, S.,Pathak, M.,Rao, J. Narayana,Kumar, P. Anil,Reddy, D. Madhusudan,Benagi, V.I.,Mahalinga, D.M.,Zhote, K.K.,Karanjkar, P.N.,Eksinghe, B.S. The Korean Society of Plant Pathology 2006 Plant Pathology Journal Vol.22 No.4
Phytophthora blight(PB), caused by Phytophthora drechsleri f. sp. cajani is the third potentially important disease of pigeonpea in the Deccan Plateau(DP) of India after wilt and sterility mosaic. In the rainy-season of 2005, an outbreak of PB was seen throughout DP. To quantify the incidence and spread of the disease, a systematic survey was conducted in the major pigeonpea growing regions of DP during the crop season 2005. Attempts were made to determine the effect of cropping systems on the PB development and identify resistant cultivars, if any, grown by farmers and on research farms. Widespread incidence of PB was recorded on improved, and or local cultivars grown in different intercropping systems. Majority of improved cultivars grown at research farms were found susceptible to PB(>10% disease incidence). Pigeonpea intercropped with groundnut, black gram and coriander had less disease incidence(${\leq}10%$). Three wilt and SM resistant pigeonpea cultivars KPL 96053, ICPL 99044, and ICPL 93179 were found resistant(<10%) to PB as well. However, their resistance to PB needs confirmation under optimum disease development environments.
MULTIPLE GENERALIZED PROLATE SPHEROIDAL WAVE TRANSFORM AND ITS APPLICATION
Sharma, S.D. Department of Mathematics 1980 Kyungpook mathematical journal Vol.20 No.1
In the present paper the multiple generalized prolate spheroidal wave transform has been developed and its useful operational property has been discussed. As an application of this new transform we have considered the non-homogeneous cubical region. The source of heat generation lies inside it and is dependent upon temperature, and the conductivity is variable.
Invertible and isometric composition operators on vector-valued hardy spaces
S. D. Sharma,Udhey Bhanu 대한수학회 2004 대한수학회보 Vol.41 No.3
Invertible and isometric composition operators acting onvector-valued Hardy space H^{2}(E) are characterized.