Characterization of CdSex Te1-x sintered films

M.Husain,L.M.Sharma,T.P.Sharma,Monika Sharma,Sushil Kumar 한국물리학회 2004 Current Applied Physics Vol.4 No.5

CdSexTe1-x is a promising ternary material which has received considerable attention due to its applications in the fabrication oflarge area economic solar cell, semiconductor-metal Schottky barrier cell, etc. This material possesses various advantages, princi-pally the high absorption coecient, optimum band gap and chemical stability, which make it attractive for this kind of devices.CdSexTe1. x lms with variable concentration (x ¼ 0 to 1) have been deposited onto ultra clean glass substrates by screen printingand then sintered. The optical, electrical and structural properties of CdSexTe1. x alloys have been studied, which were foundapplicable in photovoltaics. The optical band gap of these lms were determined by reectance measurements in the wavelengthrange of 700880 nm. The modication of band gap of intermixed CdSexTe1. x system has been described and was found suitable forecient absorption in the visible region of the spectrum. Schottky barrier height and ideality factor for Al/CdTe and Al/CdSejunctions were determined by currentvoltage characteristics. X-ray diraction patterns of these lms were reported. The lms wereof polycrystalline texture over the whole range studied and exhibit predominant cubic zinc blende structure. Sintering is very simpleand viable compared to other costly methods. It is a technique less time-consuming, of maximum material utility and less pollutantand oers a suitable method for preparing lms on large area substrares.

Oleanane triterpenes as protein tyrosine phosphatase 1B (PTP1B) inhibitors from Camellia japonica

Uddin, M.N.,Sharma, G.,Yang, J.L.,Choi, H.S.,Lim, S.I.,Kang, K.W.,Oh, W.K. Pergamon Press 2014 Phytochemistry Vol.103 No.-

Protein tyrosine phosphatase 1B (PTP1B) plays a key role in metabolic signaling, thereby making it an exciting drug target for type 2 diabetes and obesity. Besides, there is substantial evidence that shows its overexpression is involved in breast cancer, which suggests that selective PTP1B inhibition might be effective in breast cancer treatment. As part of our continuous research on PTP1B inhibitors from medicinal plants, four oleanane-type triterpenes were isolated from an EtOAc-soluble extract of fruit peels of Camellia japonica (Theaceae), together with 6 previously known compounds of this class. Their structures were determined on the basis of spectroscopic data analysis (UV, IR, <SUP>1</SUP>H and <SUP>13</SUP>CNMR, HMBC, HSQC, NOESY, and MS). All isolates were evaluated for their inhibitory effects on PTP1B, as well as their cytotoxic effects against human breast cancer cell lines MCF7, MCF7/ADR, and MDA-MB-231. Several compounds with OH-3 or/and COOH-28 functionalities showed strong PTP1B inhibitory activity (IC<SUB>50</SUB> values ranging from 3.77+/-0.11 to 6.40+/-0.81μM) as well as significant cytotoxicity (IC<SUB>50</SUB> values ranging from 0.51+/-0.05 to 13.55+/-1.44μM).

Probing in vivo Mn²⁺ speciation and oxidative stress resistance in yeast cells with electron-nuclear double resonance spectroscopy

McNaughton, R.L.,Reddi, A.R.,Clement, M.H.S.,Sharma, A.,Barnese, K.,Rosenfeld, L.,Gralla, E.B.,Valentine, J.S.,Culotta, V.C.,Hoffman, B.M. National Academy of Sciences 2010 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.107 No.35

Effects on amplification of strong ground motion due to deep soils

Jakka, Ravi S.,Hussain, Md.,Sharma, M.L. Techno-Press 2015 Geomechanics & engineering Vol.8 No.5

Many seismically vulnerable regions in India and worldwide are located on deep soil deposits which extend to several hundred meters of depth. It has been well recognized that the earthquake shaking is altered by geological conditions at the location of building. As seismic waves propagates through uppermost layers of soil and rock, these layers serve as filter and they can increase the duration and amplitude of earthquake motion within narrow frequency bands. The amplification of these waves is largely controlled by mechanical properties of these layers, which are function of their stiffness and damping. Stiffness and damping are further influenced by soil type and thickness. In the current study, an attempt has been made to study the seismic site response of deep soils. Three hypothetical homogeneous soil models (e.g., soft soil, medium soil and hard soil) lying on bedrock are considered. Depth of half space is varied from 30 m to 2,000 m in this study. Controlled synthetic motions are used as input base motion. One dimensional equivalent linear ground response analyses are carried out using a computer package DEEPSOIL. Conventional approach of analysing up to 30 m depth has been found to be inadequate for deep soil sites. PGA values are observed to be higher for deeper soil profiles as compared to shallow soil profiles indicating that deeper soil profiles are more prone to liquefaction and other related seismic hazards under earthquake ground shaking. The study recommends to deal the deeper soil sections more carefully for estimating the amplification factors for seismic hazard assessment at the surface.

Modifications of mechanical, thermal, and electrical characteristics of epoxy through dispersion of multi-walled carbon nanotubes in supercritical carbon dioxide

M.G.H. Zaidi,S.K. Joshi,M. Kumar,D. Sharma,A. Kumar,S. Alam,P.L. Sah 한국탄소학회 2013 Carbon Letters Vol.14 No.4

A supercritical carbon dioxide (SCC) process of dispersion of multi-walled carbon nano-tubes (MWCNTs) into epoxy resin has been developed to achieve MWCNT/epoxy com-posites (CECs) with improved mechanical, thermal, and electrical properties. The synthesis of CECs has been executed at a MWCNT (phr) concentration ranging from 0.1 to 0.3 into epoxy resin (0.1 mol) at 1800 psi, 90°C, and 1500 rpm over 1 h followed by curing of the MWCNT/epoxy formulations with triethylene tetramine (15 phr). The effect of SCC treat-ment on the qualitative dispersion of MWCNTs at various concentrations into the epoxy has been investigated through spectra analyses and microscopy. The developed SCC assisted process provides a good dispersion of MWCNTs into the epoxy up to a MWCNT concentra-tion of 0.2. The effects of SCC assisted dispersion at various concentrations of MWCNTs on modificationof mechanical, thermal, dynamic mechanical thermal, and tribological proper-ties and the electrical conductivity of CECs have been investigated.

EMISSION ANALYSIS OF A MEDIUM CAPACITY DIESEL ENGINE USING MAHUA OIL BIODIESEL

Sharma, Ajay Kumar,Das, L.M.,Naik, S.N.,Chauhan, Bhupendra Singh,Cho, Haeng Muk The Korean Society for Energy 2013 에너지공학 Vol.22 No.2

The stringent emission norms cannot be met through engine design and exhaust after treatment alone. Use of oxygenated fuel like biodiesel as a alternative to diesel may be the best way to reduce emissions today. In this study, Diesel fuel and pure biodiesel (mahua oil) were tested on a single cylinder naturally-aspirated direct-injection diesel engine. The study aims to investigate the effects of the mahua oil biodiesel on existing diesel engine emissions. The effect of test fuels on engine emissions like CO, HC, $CO_2$, NOx and smoke emissions was investigated with respect to the load on engine. Smoke opacity of Diesel engine was lower in case of biodiesel of mahua oil as compare to mineral diesel. NOx emissions was little higher during the whole range of loading, which is a typical characteristic of biodiesel. However the increments are within in the narrow range. $CO_2$ emissions was bit higher which is the indication of better combustion due to presence of rich oxygen in the mixture, it results in the low values of CO and HC during the whole range of experiments. Thus considering environmental norms most of the engine emissions, it can be concluded and biodiesel derived from mahua oil could be used in a conventional diesel engine without any modification.

A 57-MHz CW RFQ for the AEBL Project

D.L. Schrage,A. Barcikowski,A.A. Kolomiets,B. Rusthoven,B. Clifft,F. DePaola,G. Waldschmidt,J.W. Rathke,M. Bracken,N.E. Vinogradov,P.N. Ostroumov,S. Sharma,S.I. Sharamentov,T. Schultheiss,W. F. Toter 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I

The Advanced Exotic Beam Laboratory (AEBL) at the Argonne National Laboratory (ANL) will provide a research facility for studies of nuclear phenomena by using beams of short-lived isotopes for research in the nature of nucleonic matter, the origin of the elements, tests of the Standard Model along with applications in medicine, industry, and other applied physics research. The proposed design of the AEBL driver linac evolved from the Rare Isotope Accelerator (RIA) project. It is a CW 850 MV linac capable of accelerating uranium ions up to 200 MeV/u and protons to 570 MeV with 400 kW beam power. The first section of the linac is a 57 MHz pseudo split coaxial CW Radio Frequency Quadrupole (RFQ) linac. This is followed by 221 superconducting cavities of various types. A section of the RFQ linac was fabricated and tested under R\&D funding for the RIA Project. This is the first section of the six-section, 392 cm RFQ linac. This paper describes the design, fabrication, and testing of this RFQ.

EMISSION ANALYSIS OF A MEDIUM CAPACITY DIESEL ENGINE USING MAHUA OIL BIODIESEL

Ajay Kumar Sharma,L.M.Das,S.N.Naik,Bhupendra Singh Chauhan,Haeng Muk Cho 한국에너지학회 2013 에너지공학 Vol.22 No.2

Influence of pulsed electric field and heat treatment on Emblica officinalis juice inoculated with Zygosaccharomyces bailii

Bansal, V.,Sharma, A.,Ghanshyam, C.,Singla, M.L.,Kim, K.H. The Institution ; Hemisphere Pub. Corp. [distribut 2015 Food and bioproducts processing Vol.95 No.-

The effects of pulsed electric field (PEF) applying 26kVcm<SUP>-1</SUP> with 1μs monopolar pulses (for 500μs) on inactivation of Zygosaccharomyces bailii and the stability for the key quality characteristics (vitamin C, phenolic content, antioxidant capacity, nonenzymatic index, 5-hydroxymethyl-2-furfural (HMF), <SUP>o</SUP>brix, and pH) in Emblica officinalis juice were studied. These results were then compared to those of heat treatment (90<SUP>o</SUP>C for 60s) up to 40 days on storing at 4<SUP>o</SUP>C. PEF treatment reduced 5.1log cycles of Z. bailii with decreases in HMF concentration and browning index relative to heat treated juice. Simultaneously, PEF treated juice retained 63% of vitamin C and 88.9% of antioxidant capacity (p<0.05). However, heat treated juice lowered 4.9log cycles of Z. bailii and exhibited significant degradation of vitamin C and antioxidant capacity (p<0.01). After all, both treatments did not induce any major changes in pH and <SUP>o</SUP>brix levels of emblica juice. Electron microscopy was used as a tool to find Z. bailii damage induced. Investigation of their morphology showed a leakage of cellular debris owing to the rupture of cell membrane of PEF treated Z. bailii. Thus, PEF treatment on emblica juice may offer an enormous potential for upgrading its quality than the heat processing method.

Prognostic Importance of Spinopelvic Parameters in the Assessment of Conservative Treatment in Patients with Spondylolisthesis

Sai Krishna M L V,Deep Sharma,Jagdish Menon 대한척추외과학회 2018 Asian Spine Journal Vol.12 No.2

Study Design: This was a prospective, two-group comparative study. Purpose: The present study aimed to determine the importance of the spinopelvic parameters in the causation and progression of spondylolisthesis. Overview of Literature: Spondylolisthesis is slippage of one vertebra over the vertebra below. Since the discovery of pelvic incidence (PI) in 1998 in addition to documentation of other parameters in spinopelvic balance, slippage in spondylolisthesis has been attributed to these parameters. Many studies on the Caucasian population have implicated high PI as a causative factor of spondylolisthesis. To the best of our knowledge, no study has described the role of these parameters in the progression of spondylolisthesis. Methods: The study was conducted in Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India. Seventy-nine patients with spondylolisthesis consented to participate in the study. All patients were advised to undergo conservative treatment and were regularly followed up according to the protocol. Seventy-five asymptomatic volunteers were recruited as a control group. Of the total of 79 patients, 54 were followed up for 6 months, during which 46 improved, eight showed no improvement, and 25 were lost to follow-up. Sagittal spinopelvic parameters were measured by a single observer using the Surgimap spine software ver. 2.1.2 (Nemaris, New York, NY, USA). Parameters measured were PI, pelvic tilt (PT), sacral slope (SS), thoracic kyphosis, and lumbar lordosis. The results from patients and controls were compared using appropriate statistical methods. Results: The normal and spondylolisthesis groups significantly differed with respect to PI, SS, and PT (p <0.001). There were no significant differences in the measured spinopelvic parameters between patients with high- and low-grade spondylolisthesis or between those whose condition improved and those whose condition worsened. Conclusions: PI, the most important of all spinopelvic parameters, is responsible for the slip in spondylolisthesis, but not for its progression.