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RISS 인기검색어
- 검색키워드
- 저자 : Vikas Verma (검색결과 10 건)
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Vikas Verma,K. Murugesan 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.1
Experimental investigation of solar assisted ground source heat pump system has been carried out to understand performance variation during space heating for continuous eight hours operation from morning to evening for Indian winter climatic conditions. Heat extraction rate from solar collector and ground exchanger were monitored from 9 AM to 5 PM on hourly basis by measuring the inlet and outlet temperatures of heat transfer fluids. A detailed thermodynamic energy balance carried out on hourly basis indicates maximum heat loss is observed at 12 noon at which maximum heat extraction from solar collector and ground heat exchanger was obtained. Maximum COP of the SAGSHP system is observed at 12 noon for all the three mass flow rates, however, the COP decreases up to 3 % with increase in severity of winter due to increase in heat loss. About 44 % increase in mass flow rate of heat carrying fluids has enhanced the heat extraction rate up to 18 %, resulting in about 3 % increase in room temperature. The SAGSHP system was able to maintain the room temperature at about 20 to 21 °C when the ambient temperature was at about 12 °C.
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Verma, Vikas,Kumar, B.V. Manoj Elsevier 2017 Wear: An international journal on the science and Vol.376 No.2
<P><B>Abstract</B></P> <P>Dense (>98.5%) TiCN-WC-Ni/Co cermets with or without TaC are prepared by spark plasma sintering technique at 1400°C and 70MPa pressure for 3min and their friction and wear properties are investigated against commercially available hard counterbody silicon carbide ball at 5, 10 or 20N load. Core-rim morphology is observed in SEM images of sintered samples which results due to dissolution and reprecipitation process. Vickers Hardness and fracture toughness varied from 15–17GPa and 8.79 to 9.51MPam<SUP>1/2</SUP>. Nano hardness of core-rim-binder phases of cermets lie between 11.14–26.01GPa. Maximum hardness and fracture toughness were obtained for Ti(CN)-5WC-10Ni-10Co-5TaC (in wt%) cermet. With change in the cermet composition and sliding load, coefficient of friction varied from 0.3 to 1.1. Wear rate of cermets varied from 4.7×10<SUP>−7</SUP> mm<SUP>3</SUP>/Nm to 2.2×10<SUP>−6</SUP> mm<SUP>3</SUP>/Nm and of worn SiC ball from 4.4×10<SUP>−7</SUP> mm<SUP>3</SUP>/Nm to 1.5×10<SUP>−6</SUP> mm<SUP>3</SUP>/Nm. Hard debris oxides are responsible for higher COF at low load of 5N and their compaction leads to the formation of tribolayer at high load of 20N. The worn surfaces of cermets are characterized by microcracking, tribolayer formation and spalling. The addition of TaC in TiCN-WC-Ni/Co cermets led to the refined carbide size having lowest contiguity of ceramic phase and attributed to reduced wear. Present research contributes in context of dry machining conditions and is conducted to explore the potential of new cermet material in severe wear conditions against hard material.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Present research is to explore the potential of new cermet material in severe sliding wear conditions against hard material. </LI> <LI> Effect of TaC as ternary carbide on mechanical and tribological behavior of SPSed processed TiCN-WC-Ni/Co cermets is studied. </LI> <LI> Present research contributes in context of dry wear conditions. </LI> <LI> The wear mechanisms are particularly elucidated in terms of cermet composition and sliding load. </LI> </UL> </P>
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Verma, Vikas,Paek, A Rome,Choi, Beom-Kyu,Hong, Eun Kyung,You, Hye Jin John Wiley and Sons Inc. 2019 Journal of Cellular and Molecular Medicine Vol.23 No.6
<P><B>Abstract</B></P><P>Several studies have shown that expression of zinc‐finger protein 143 (ZNF143) is closely related to tumour progression including colon cancer. However, it remains unclear how ZNF143 expression is related to tumour progression within the tumour microenvironment. Here, we investigated whether ZNF143 expression affects the tumour microenvironment and tumour progression by screening molecules secreted by colon cancer cells stably expressing short‐hairpin RNAs against ZNF143 or control RNAs. We observed that secretion of interleukin (IL)‐8 was increased when ZNF143 expression was reduced in two colon cancer cell lines. The mRNA and protein levels of IL‐8 were increased in cells following ZNF143 knockdown, and this effect was reversed when ZNF143 expression was restored. The Janus tyrosine kinase/signal transducer and activator of transcription (JAK/STAT) and extracellular signal‐regulated kinase pathways were also shown to contribute to IL‐8 expression in ZNF143‐knockdown cells. The expression levels of ZNF143 and IL‐8 were inversely correlated with three‐dimensionally grown spheroids and colon cancer tissues. THP‐1 cells were differentiated when cells were incubated with condition media from colon cancer cell with less ZNF143, drastically. Loss of ZNF143 may contribute to the development of colon cancer by regulating intracellular and intercellular signalling for cell plasticity and the tumour microenvironment respectively.</P>
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Gaurav Verma,Vikas Verma,Divya Sharma,Adesh Kumar,Himanshu Verma,Kartik Kalia 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.3
Unicode font is used in coding system that assign a unique code to every symbol of scripts irrespective of their platform, and language. The Greek Unicoder receives 16-bit hexadecimal code of alphabet. The device has been designed to convert Greek language into different languages that our people could understand. This Unicode reader code has been implemented on 28nm FPGA platform called Kintex-7 FPGA. In this paper we are using frequency scaling technique and Design goal. In this paper power analysis is our main concern and we have studied about the power analysis at different frequencies keeping the temperature constant at 25 degree Celsius and maintaining the constant air flow.
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Vikas Kumar,Ajit Kumar Thakur,Suruchi Verma,Vaishali Yadav,Shyam Sunder Chatterjee 셀메드 세포교정의약학회 2015 셀메드 (CellMed) Vol.5 No.2
Medicinal uses of edible and other plants for prevention and cure of obesity and overweight associated metabolic and mental health problems have since long been known to scholars and practitioners of Ayurvedic and other traditionally known system of medicine. Modernized versions of numerous edible plant derived formulations mentioned in ancient Ayurvedic texts are at present some of the most popular, or best selling, herbal remedies in India and numerous other countries suffering from double burden of diseases caused by malnutrition and obesity. Preclinical and clinical information now available on edible plants and their bioactive constituents justify traditionally known medicinal uses of products derived from them for prevention and cure of obesity associated type-2 diabetes, psychopathologies and other health problems. Such information now available on a few edible Ayurvedic plants and their formulations and suggesting that their stress response regulating effects are involved in their broad spectrums of bioactivity profiles are summarized in this communication. Implications of recent physiological and pharmacological observations made with numerous phytochemicals isolated from edible plants for better understanding of traditionally known medicinal uses of herbal remedies are also pointed out.
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Bandedge Emission in Sprayed ZnO Thin Films
Vikas Thakur,Udai Pratap Verma,Rajaram Poolla 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.6
ZnO thin films were grown by spraying aqueous solutions of zinc acetate on quartz and silicon substrates heated to 500°C. X-ray diffraction (XRD) studies show that the ZnO films crystallize in the hexagonal phase and are highly oriented along the [002] direction. SEM micrographs show that the surface of the films is uniformly covered with worm shaped particles. EDAX results together with XRD studies confirm that the synthesized films are single phase ZnO with good stoichiometry. The sharp absorption occurring near the band edge indicates high quality growth of the material. Room temperature photoluminescence (PL) studies of the sprayed films show a strong near band edge (NBE) emission. PL spectra obtained at low temperature (20 K) exhibit better resolved peaks of the NBE emission caused by the radiative recombination of free and bound excitons. The dominant free exciton emission observed in the PL spectra confirms the high quality of the sprayed ZnO layers.
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Fotedar, Vikas,Seam, Rajeev K.,Gupta, Manoj K.,Gupta, Manish,Vats, Siddharth,Verma, Sunita Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.1
Background: Breast cancer is an increasing health problem in India. Screening for early detection should lead to a reduction in mortality from the disease. It is known that motivation by nurses influences uptake of screening methods by women. This study aimed to investigate knowledge of breast cancer risk factors & early detection methods and the practice of screening among nurses in Indira Gandhi Medical College, Shimla, Himachal Pradesh. Materials and Methods: A cross-sectional study was conducted using a self-administered questionnaire to assess the knowledge of breast cancer risk factors, early detection methods and practice of screening methods among 457 nurses working in a Indira Gandhi Medical College, Shimla-H.P. Chi square test, Data was analysed using SPSS version 16. Test of significance used was chi square test. Results: The response rate of the study was 94.9%. The average knowledge of risk factors about breast cancer of the entire population is 49%. 10.5% of nurses had poor knowledge, 25.2% of the nurses had good knowledge, 45% had very good knowledge and 16.3% of the nurses had excellent knowledge about risk factors of breast cancer and early detection methods. The knowledge level was significantly higher among BSC nurses than nurses with Diploma. 54% of participants in this study reportedly practice BSE at least once every year. Less than one-third reported that they had CBE within the past one year. 7% ever had mammogram before this study. Conclusions: Results from this study suggest the frequent continuing medical education programmes on breast cancer at institutional level is desirable.
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Urvashi Verma,Vikas Thakur,Poolla Rajaram,A. K. Shrivastava 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.1
A series of nanocrystalline thin films of cadmium zinc sulphide(Cd1-xZnxS) solid solution were deposited on glass substrates usingspray pyrolysis. Cadmium chloride (CdCl2), zinc chloride (ZnCl2) andthiourea (NH2CSNH2) were used as the sources of Cd, Zn and Srespectively. The films were characterized using structural, morphologicaland optical techniques. X-ray diffraction (XRD) studies show thatthe films of Cd1-xZnxS are polycrystalline and single phase having thewurtzite structure. The crystallites in the thin films of pure CdS possesspreferred crystallographic orientation along the <002> direction. Thepreferred orientation of crystallites in the Cd1-xZnxS films changes from<002> to <101> with increase in Zn concentration. The latticeparameters of Cd1-xZnxS decrease with increase in Zn concentration. Scanning electron microscopy (SEM) and atomic force microscopy(AFM) studies show that the surfaces of the films are smooth and areuniformly covered with nanoparticles. Energy dispersive analysis of xrays(EDAX) results reveal that the grown films have goodstoichiometry. Optical transmission spectra confirm the good qualityof the Cd1-xZnxS films.
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