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Defence Technology（防务技术） 2021年第1期17卷 234-244页

作者： sumit sharma s.K.tiwari sagar shakya Department of Mechanical Engineering Dr.B.R.Ambedkar National Institute of TechnologyJalandharIndia

This work uses the molecular dynamics approach to study the effects of functionalization of carbon nanotubes(CNTs)on the mechanical properties of Cu64Zr36 metallic glass(MG).Three types of functional groups,carboxylic,vinyl and ester were *** effect of CNT volume fraction(Vf)and the number of functional groups attached to CNT,on the mechanical properties and thermal conductivity of CNT-MG composites was analysed using Biovia Materials *** lower values of Vf(from 0 to 5%),the percentage increase in Young’s modulus was approximately 66%.As the value of Vf was increased further(from 5 to 12%),the rate of increase in Young’s modulus was reduced to 16%.The thermal conductivity was found to increase from 1.52 W/mK at Vf?0%to 5.88 W/mK at Vf?12%,thus giving an increase of approximately 286%.Functionalization of sWCNT reduced the thermal conductivity of the sWCNT-MG composites.

关键词： Molecular dynamics Carbon nanotube Metallic glass Mechanical properties Thermal conductivity

Plasmonic enhancement of upconversion emission in Ag@NaYF4:Er^3+/Yb^3+phosphor

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Journal of Rare Earths 2018年第9期36卷 903-910页

作者： s.K.Maurya s.R tiwari A.Kumar K.Kumar Optical Materials and Bio-imaging Research Laboratory Department of Applied PhysicsIndian Institute of Technology(Indian School of Mines)Dhanhad-826004India

In this article upconversion luminescence of silver nanoparticles（AgNPs） coated NaYF4：Er3＋/Yb3＋phosphor nano-particles was *** prepared samples were characterized through various *** surface plasmon band is observed for prepared AgNPs by analyzing UV-vis measurements and is used to enhance the upconversion *** the upconversion measurement the emission bands are observed at 522,546,and 656 nm corresponding to the 2 H11/2→ 4115/2,4 s3/2→4 I15/2and 4 F9/2→4 I15/2 levels,*** upconversion emission intensity of the above bands is found to enhance for sample containing 1 mmol *** time of 4 s3/2 and 4F9/2 levels is found to decrease on coating of AgNPs and hence intensity enhancement is assumed due to the surface plasmon resonance（sPR） effect.

关键词： Upconversion phosphor surface plasmon resonance Decay time analysis CIE diagram Rare earths

Harmful algal blooms in fresh and marine water systems： The role of toxin producing phytoplankton

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International Journal of Biomathematics 2016年第3期9卷 191-210页

作者： Nilesh Kumar Thakur s. K. tiwari Ranjit Kumar Upadhyay Department of MathematicsNational Institute of Technology Raipur 492010 Department of Applied MathematicsIndian school of Mines Dhanbad 826004

In this paper, we have investigated a model with three interacting species： non-toxic phy- toplankton, toxic phytoplankton and zooplankton with Holling type II and III functional responses over the space and time. The role of toxin producing phytoplankton （TPP） has been studied. We have presented the theoretical analysis of pattern formation in spatially distributed population with local diffusion. The paper highlights the hetero- geneity of HABs over space and time. The choice of parameter values and the functional response is important to study the effect of TPP, also it would depend more on the non- linearity of the system. With the help of numerical simulations, we have observed the spatial and spatiotemporal patterns for plankton system. This study demonstrates that TPP plays an important role in controlling the dynamics. We have observed that prey＇s anti-predator efforts promote predator switching. It has been found that high predation of TPP helps for the coexistence of toxic, non-toxic phytoplankton and zooplankton population.

关键词： Plankton harmful algal bloom toxin producing phytoplankton spatiotem-poral pattern.

A neutronic experiment to support the design of an Indian TBM shield module for ITER

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Plasma science and Technology 2019年第6期21卷 147-152页

作者： H L sWAMI M ABHANGI sanchit sHARMA s tiwari A N MIsTRY V VAsAVA V MEHTA s VALA C DANANI V CHAUDHARI P CHAUDHURI Institute for Plasma Research Gandhinagar Gujarat 382428 India Homi Bhabha National Institute(HBNI) Anushaktinagar Mumbai 400094 India Pandit Deendayal Petroleum University Gandhinagar Gujarat 382007 India

A shield module is associated with an Indian Test Blanket Module (TBM) in ITER to limit the radiation doses in port inter-space *** shield module is made of stainless steel plates and water *** is identified as an important component for radiation protection because of its radiation exposure control *** radiation protection classification leads to more assurance of the component *** order to validate and verify the design of the shield module,a neutronic laboratory-scale experiment is designed and *** experiment is planned by considering the irradiation under a neutron source of 14 MeV and yields of 1010 n *** reference neutron spectrum of the ITER TBM shield module has been achieved through optimization of the neutron source spectrum by a combination of steel and lead *** neutron spectrum and flux are measured using a multiple foil activation technique and neutron dose-rate meter LB 6411 (He-3 proton recoil counter with polyethylene),*** neutronic design simulation is assessed using MCNP5 and FENDL 2.1 crosssection *** paper covers neutronic design,irradiation and the outcome of the experiment in detail.

关键词： TBM shield module neutronic experiment ITER MCNP neutron attenuation

Experimental study of stacked Rectangular Microstrip Antenna for Dual-Band

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Engineering（科研） 2010年第2期2卷 85-90页

作者： R.K. Vishwakarma s. tiwari 不详

A dual-band characteristic of stacked rectangular microstrip antenna is experimentally studied. It is a probe fed antenna for impedance matching with 50Ω coaxial cable. This antenna works well in the frequency range (2.86 to 4.63 GHz). It is basically a low cost, light weight medium gain antenna, which is used for mobile communication. The variations of the length and width (1mm) of the stacked rectangular patch antenna have been done. And it is found dual resonance with increasing lower resonance frequency and almost constant upper resonance frequency with increases of the length & width of rectangular microstrip antenna. The input impedance and VsWR, return loss have been measured with the help of Network analyzer.

关键词： Microstrip Antenna stacked Patch Antenna Dual-Band Antenna Network Analyzer Bandwidth

Analysis of Rectangular Notch Antenna for Dual-Band Operation

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Engineering（科研） 2010年第2期2卷 91-96页

作者： R.K. Vishwakarma s. tiwari 不详

In this paper a design of single layer rectangular notch microstrip antenna for dual-band is proposed and experimentally investigated. This antenna is excited by microstrip line. Direct microstrip coupling with proper matching transformer has been used. Design is made for optimized notch dimension for two resonant frequencies. These resonance frequencies change with the variation in length and width of the notch. The input impedance and VsWR have been measured with the help of Network analyzer. It is found that the input impedance and VsWR depends variation in length and width of the notch microstrip antenna.

关键词： Microstrip Antenna Notch Antenna Dual-Band Antenna Matching Transformer

EGFR expression as a predictive marker in esophageal squamous cell cancer:Review article

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东南大学学报（医学版） 2014年第4期33卷 540-544页

作者： tiwari s GAUTAM M K LI sY Department of Oncology Zhongda HospitalSoutheast University Department of Pediatrics Zhongda HospitalSoutheast University Department of Oncology Oncology HospitalHefei City

Esophageal cancer(EC)is a highly aggressive disease and 8thleading cause of death *** cell cancer is the main histological type in *** improvements in both surgical techniques and adjuvant/neoadjuvant radiotherapy and chemotherapy approaches have increased the survival of patients with the locoregional ***,most of the patients with EC have advanced disease either at diagnosis or at *** recent advances in the treatment,these patients still do *** expression of the epidermal growth factor receptor in esophageal cancer is associated with poor ***,very few researches have examined the role of epidermal growth factor receptor(EGFR)in prediction and therapeutic sensitivity to esophageal squamous cell cancer(EsCC).If pretherapeutic identification of esophageal squamous cell cancer which does not respond to chemoradiotherapy(CRT)can be done,it will help to improve the outcome of patients by selecting responders to *** this review we describe the predictive significance of EGFR expression in EsCC.

关键词： esophageal squamous cell cancer predictive marker chemoradiotherapy

some Features of Black Carbon Aerosols Connected with Regional Climate Over Pristine Environment

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Journal of Atmospheric science Research 2024年第1期7卷 1-18页

作者： saurabh Yadav Panuganti C.s.Devara s.M.sonbawne B.s.Murthy s.tiwari s.Wadhwa A.Kumar Amity Centre of Excellence in Ocean-Atmosphere science and Technology(ACOAsT) Amity University Haryana(AUH)Gurugram122413India Indian Institute of Tropical Meteorology(IITM) PashanPune411008India

The authors report the results of aethalometer black carbon(BC)aerosol measurements carried out over a rural(pristine)site,Panchgaon,Haryana state,India during the winter months of 2021-2022 and *** are compared with collocated and concurrent observations from the Air Quality Monitoring station(AQMs),which provides synchronous air pollution and surface meteorological *** variations in BC mass concentration are studied and explained with variations in local meteorological *** biomass burning fire count retrievals from NAsA-NOAA VIIRs satellite,and backward airmass trajectories from NOAA-ERL HYsPLIT Model analysis have also been utilized to explain the *** reveal that the north-west Indian region contributes maximum to the BC mass concentration over the study site during the study ***,the observed BC mass concentrations corroborate the synchronous fire count,primary and secondary pollutant *** results were found to aid the development of mitigation methods to achieve a sustainable climate system.

关键词： Carbonaceous aerosols Dual-spot technique Temporal variations Primary and secondary pollutants stubble burning Long-range transport satellite products

study of Intermolecular Interactions in Liquid Crystals: Para-butyl-p’-cyano-biphenyl

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Journal of Crystallization Process and Technology 2014年第1期4卷 31-38页

作者： K. K. Dwivedi M. K. Dwivedi s. N. tiwari Department of Physics D.D.U. Gorakhpur University Gorakhpur India.

Various characteristics of mesomorphism can be explained using intermolecular interactions between a pair of liquid crystalline molecules. The intermolecular interactions have been calculated considering multipole-multicentere expansion method and modified by second order perturbation treatments. For calculation of multipole i.e. charge, dipole, etc. at each atomic center of molecules, para-butyl-p’-cyano-biphenyl, GAMEss, an ab initio program, with 6-31G* basis set has been used. The stacking, in-plane and terminal interaction energies explain the liquid crystalline behaviour of the system.

关键词： Liquid Crystals Phase Transition Intermolecular Interactions GAMEss Multicentred-Multipole Expansion

在MEsFET中畴的形成——器件结构和材料参数的影响

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微纳电子技术 1981年第1期 73-78页

作者： s.tiwari 陈显萼

一、引言限制 GaAs MFs FET 输出功率的最重要的因素中的两点是:低的击穿电压和高的衬底电导。前者主要涉及功率 FET 的几何结构,后者同材料特性有关。本文的目的是报导:(a)所研究的一种新的器件结构,(b)在所掺杂的范围内获得高的击穿电... 详细信息

一、引言限制 GaAs MFs FET 输出功率的最重要的因素中的两点是:低的击穿电压和高的衬底电导。前者主要涉及功率 FET 的几何结构,后者同材料特性有关。本文的目的是报导:(a)所研究的一种新的器件结构,(b)在所掺杂的范围内获得高的击穿电压,和(c)高纯的未掺杂的缓冲层对 FET 静态特性的影响。我们还将报导采用电子束感生电流(EBIC)在漏回路所获得的电场分布,和采用通过场效应晶体管的沟道各点上碳俄歇谱线的移动所获得的表面电压分布。

关键词：边缘电场缓冲层栅间距金属半导体场效应晶体管击穿电压器件结构电场分布材料参数