检索结果-南通市图书馆

Chinese Physics B 2020年第10期29卷 566-572页

作者： Deepika Raju Kumar Ritesh Kumar Kamdeo Prasad Yadav pratyush vaibhav Seema Sharma Rakesh Kumar Singh Santosh Kumar College o f Commerce Arts and SciencePatna.BiharIndia Jaypee University o f Engineering and Technology GunaMadhya PradeshIndia Anugrah Narayan College PatnaBiharIndia Aryabhatta Knowledge University PatnaBiharIndia

Zn0.90Ni0.10O nanoparticles have been synthesized by single-bath two-electrode electrodeposition at constant voltage. X-ray diffraction, UV vis and photoluminescence studies reveal that a single-phase polycrystalline hcp wurtzite crystal structure of ZnO is evolved. The material consists of a large number of defects such as oxygen vacancy (Ov) and zinc interstitial (Zi). The magnetization study reveals that the sample exhibits room-temperature global ferromagnetism and the ferromagnetic ordering seems to be defect induced via bound magnetic polaron mechanism, and double exchange is also expected to have played role. Interesting optoelectronic properties have been found in the synthesized sample and the material seems to be a potential candidate to be used as a UV sensor. Such a transition metal doped ZnO based dilute magnetic semiconducting system exhibiting room-temperature ferromagnetism is likely to be first of its kind in the sense that such materials have not yet been reported to be synthesized by the simple method of electrodeposition to the best of our knowledge on the basis of ample literature review.

关键词： dilute magnetic semiconductors(DMS) bound magnetic polaron photoluminescence ferromagnetism

Shock wave mitigation using zig-zag structures and cylindrical obstructions

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2021年第6期17卷 1840-1851页

作者： Arun Kumar R vaibhav Pathak Department of Mechanical Engineering Indian Institute of Technology Jodhpur(IITJ)JodhpurRajasthan342037India

The present study focuses on the mitigation of shock wave using novel geometric passages in the flow *** strategy is to produce multiple shock reflections and diffractions in the passage with minimum flow obstruction,which in turn is expected to reduce the shock wave strength at the target *** the present study the interaction of a plane shock front(generated from a shock tube)with various geometric designs such as,1)zig-zag geometric passage,2)staggered cylindrical obstructions and 3)zigzag passage with cylindrical obstructions have been investigated using computational *** is seen from the numerical simulation that,among the various designs,the maximum shock attenuation is produced by the zig-zag passage with cylindrical obstructions which is then followed by zig-zag passage and staggered cylindrical obstructions.A comprehensive investigation on the shock wave reflection and diffraction phenomena happening in the proposed complex passages have also been carried *** the new zig-zag design,the initial shock wave undergoes shock wave reflection and diffraction process which swaps alternatively as the shock front moves from one turn to the other *** cyclic shock reflection and diffraction process helps in diffusing the shock wave energy with practically no obstruction to the flow *** is found that by combining the shock attenuation ability of zig-zag passage(using shock reflection and diffraction)with the shock attenuation ability of cylindrical blocks(by flow obstruction),a drastic attenuation in shock strength can be achieved with moderate level of flow blocking.

关键词： Blast wave mitigation Blockage ratio Geometric obstructions Shock wave reflection and diffraction Zig-zag structure

Clinical practice of early extubation after liver transplantation

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2012年第6期11卷 577-585页

作者： vaibhav Rastogi First Affiliated Hospital Zhejiang University School of Medicine

BACKGROUND: Anesthetic practices such as early tracheal extubation facilitate postoperative recovery. Early extubation after liver transplantation has been adopted by some centers in the recent two decades. No universal clinical guidelines are used and questions remain. This review aimed to address the current status of early extubation after liver transplantation. DATA SOURCES: A literature search of MEDLINE and ISI Web of Knowledge databases was performed using terms such as liver transplantation, early extubation, immediate tracheal extubation fast tracking or fast track anesthesia and postoperative tracheal extubation. Additional papers were identified by a manual search of the references in the key articles. RESULTS: Review of the available literature provided an insight into the definition, evolution, advantages and risks of early extubation, and anesthetic techniques that prompt early extubation in liver transplant patients. Early extubation has proved to be feasible and safe in these patients, but the outcomes are still uncertain. CONCLUSIONS: Early extubation after liver transplantation is feasible, safe and cost-effective in the majority of patients and has been increasingly accepted as an option for conventional postoperative ventilation. Comprehensive and individualized evaluation of the patient’s condition before extubation by an experienced anesthesiologist is the cornerstone of success Understanding of its effect on the outcome remains incomplete In the future, additional trials are required to establish universal early extubation guidelines and to determine its benefits for patients and practitioners.

关键词： liver transplantation extubation ventilation anesthesia

Behavior of ring footing resting on reinforced sand subjected to eccentric-inclined loading

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2018年第2期10卷 347-357页

作者： vaibhav Sharma Arvind Kumar Dr.B.R.Ambedkar National Institute of Technology Jalandhar144011India

Ring footings are suitable for the structures like tall transmission towers, chimneys, silos and oil *** types of structures are susceptible to horizontal loads(wind load) in addition to their dead *** the literature, very little or no effort has been made to study the effect of ring footing resting on reinforced sand when subjected to eccentric, inclined and/or eccentric-inclined loadings. This paper aims to study the behavior of ring footing resting on loose sand and/or compacted randomly distributed fiberreinforced sand(RDFS) when subjected to eccentric(0 B, 0.05 B and 0.1 B, where B is the outer diameter of ring footing), inclined(0°,5°,10°, 15°,-5°,-10° and-15°)and eccentric-inclined loadings by using a finite element(FE) software PLAXIS 3 D. The behavior of ring footing is studied by using a dimensionless factor called reduction factor(RF). The numerical model used in the PLAXIS 3 D has been validated by conducting model plate load tests. Moreover, an empirical expression using regression analysis has been presented which will be helpful in plotting a load-settlement curve for the ring footing.

关键词： Soil reinforcement Ring footing Numerical method Randomly distributed fibers Load inclination Load eccentricity Model tests Reduction factor(RF)

Fano profile in a novel double cavity optomechanical system with harmonically bound mirrors

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2020年第9期72卷 96-103页

作者： vaibhav N Prakash Aranya B Bhattacherjee School of Physical Sciences Jawaharlal Nehru UniversityNew Delhi-110067India Department of Physics Birla Institute of Technology and SciencePilaniHyderabad CampusHyderabad一50007&India

We investigate a double cavity optomechanical system generating single and double Fano resonance(multi-Fano). By altering a single parameter, the tunnelling rate g of the middle mirror, we are able to switch between single and double Fano line shapes. The first spectral line shape is stronger in the case of multi-Fano than in the case of single Fano. Also the behaviour of the steady state value of the displacement of the middle mirror, with respect to g, heavily influences the behaviour of double Fano lines in our scheme. This tunability along with using a single pump and signal/probe laser has an added advantage in situations where only low power consumption is available.

关键词： optomechanics double Fano resonance optical switch single Fano resonance

Bi3+assisted luminescence in SrMoO_(4):Sm^(3+) red phosphors

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2021年第11期39卷 1336-1343,I0002页

作者： vaibhav Chauhan Prashant Dixit Praveen C.Pandey Department of Physics Indian Institute of Technology(Banaras Hindu University)Varanasi221005UPIndia

In this paper,we report synthesis of pure SrMoO_(4),Sm^(3+)(1 at%-5 at%)doped SrMoO_(4)and Bi^(3+)(1 at%-3 at%)co-doped in 4 at%Sm^(3+)doped SrMoO_(4)(SrMoO_(4):4 Sm^(3+))phosphors by solution combustion *** X-ray diffraction(XRD)analysis reveals the tetragonal phase of all samples,also Bi^(3+)co-doping supports crystallite size growth and reduces lattice *** analysis of Sm^(3+)doped SrMoO_(4)ascertains a decrease in band gap and Bi^(3+)co-doping confirms the emergence of an absorbance peak at around 308 nm attributed to Bi^(3+)energy ***(PL)analysis ascertains an increase in emission peaks for Sm^(3+)doped SrMoO_(4)up to 4%concentration,which are attributed to an electron transition from 4 G5/2 to 6 HJ(J=5/2,7/2,9/2,and 11/2)energy levels of Sm^(3+)*** have explained the effects of Bi^(3+)co-doping on the luminescence of Sm^(3+)doped SrMoO_(4).The reduced microstrain and increased crystallinity of the phosphors as a result of Bi^(3+)co-doping and their correlation with the luminescence of Sm^(3+)ions are discussed.

关键词： SrMoO_(4):Sm^(3+) Bismuth ion Photoluminescence Absorption study Crystallinity Microstrain

Semiconductor based photocatalysts for detoxification of emerging pharmaceutical pollutants from aquatic systems: A critical review

在线全文

学校读者我要写书评

暂无评论

Nano Materials Science 2021年第1期3卷 25-46页

作者： Prasenjit Kar Komal Shukla pratyush Jain Govindasamy Sathiyan Raju Kumar Gupta Department of Chemical Engineering Indian Institute of Technology KanpurKanpur208016Uttar PradeshIndia Center for Environmental Science and Engineering Indian Institute of Technology KanpurKanpur208016Uttar PradeshIndia

The presence of emerging pharmaceutical pollutants at low concentration levels in the surface and ground water has caused a potential threat to the marine and human *** emerging pharmaceutical pollutants generally include analgesics and anti-inflammatories,lipid-lowering drugs,antiepileptics,antibiotics,and β-blockers *** recent years,various processes have been developed and advanced oxidation process is the most effective for decontamination of emerging pharmaceutical pollutants till *** based photocatalysis technology has recently received a great interest for the removal of new emerging pharmaceutical *** review article highlights the removal of emerging pharmaceutical pollutants especially through photocatalysis as well as recent progress using different *** focus has been given over fundamental key dynamics processes of nanomaterials and degradation pathways of emerging pharmaceutical ***,this review concludes with the perspectives and outlook over future developments in photocatalysis technology for the degradation of emerging pharmaceutical pollutants leading to a solution for realworld in near future.

关键词： Emerging pharmaceutical pollutants Photocatalysis Nanomaterials Degradation mechanism

Employing nanoparticle tracking analysis of salivary neuronal exosomes for early detection of neurodegenerative diseases

在线全文

学校读者我要写书评

暂无评论

Translational Neurodegeneration 2023年第1期12卷 791-800页

作者： vaibhav Sharma Fredrik Nikolajeff Saroj Kumar Department of Health Education and TechnologyLulea University of TechnologyLuleaSweden Department of Biophysics All India Institute of Medical SciencesNew DelhiIndia

Neurodegenerative diseases are a set of progressive and currently incurable diseases that are primarily caused by neuron *** diseases often lead to cognitive impairment and *** is now well recognized that molecular events precede the onset of clinical symptoms by *** the past decade,intensive research attempts have been aimed at the early diagnosis of these ***,exosomes have been shown to play a pivotal role in the occurrence and progression of many diseases including cancer and neurodegenerative ***,because exosomes can cross the blood-brain barrier,they may serve as a diagnostic tool for neural *** this review,we detail the mechanisms and current challenges of these diseases,briefly review the role of exosomes in the progression of neurodegenerative diseases,and propose a novel strategy based on salivary neuronal exosomes and nanoparticle tracking analysis that could be employed for screening the early onset of neurodegenerative diseases.

关键词： Exosomes Parkinson’s disease Alzheimer’s disease Neurodegenerative disease Diagnosis Prognosis Extracellular vesicles Nanoparticle tracking analysis

Natural Ventilation Design:Predicted and Measured Performance of a Hostel Building in Composite Climate of India

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Energy and Built Environment 2021年第1期2卷 82-93页

作者： Durva Gupta vaibhav Rai Khare Centre for Energy&Environment Malaviya National Institute of TechnologyJaipur

Natural ventilation is recognized for improving the thermal comfort of the built environment and indoor air *** provides comfortable conditions for building occupants and reduces energy consumption for ***,it is important to study and explore effective means of ventilation to improve the building *** study investigates the thermal comfort of a naturally ventilated hostel operational building in the composite climate of Jaipur,India using Computational Fluid Dynamics(CFD)simulation tool‘Cradle scSTREAM’.A 3D building model has been developed to analyze the thermal comfort for different natural ventilation strategies with advanced mesh algorithms which generate fewer mesh elements and maintain good mesh quality.A field study was carried out to collect the actual data and to validate the model which was further used to evaluate the thermal comfort range based on the ASHRAE-55 *** design strategies have been applied to enhance thermal *** was found that an increase in air velocity up to 0.5 m/s was achieved by Cross Ventilation while a drop of 2.0-2.5℃in the air temperature was found using Night *** can be stated that cross ventilation increases the air movement while night ventilation gives comparatively higher comfort regarding air temperature and relative humidity.

关键词： Natural Ventilated Buildings CFD Cradle scSTREAM Night Ventilation Cross Ventilation Thermal Comfort

Lattice strain driven dielectric insulation response of Sr_(1-x)Ca_(x)Bi_(2)Nb_(2)O_(9) ceramics

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Advanced Dielectrics 2016年第3期6卷 50-55页

作者： vaibhav Shrivastava Department of Physics Shiv Nadar University Gautam Buddha Nagar 203207Uttar PradeshIndia

In this paper,effects of lttice strain on dielectric properties of Sr_(1-x)Ca_(x)Bi_(2)Nb_(2)O_(9)(x=0.0-0.5 in steps of 0.1)ceramics are *** frequency dipolar polarization is observed to increase for 10%calcium addition and suppresses thereafter on higher calcium *** dielectric loss values for all doped samples were lower compared to undoped one at frequencies beyond 1 *** sample with x=0.1 shows room temperature dielectric constant in the range(130±12)over a wide frequency range from 50Hz to 1 MHz also minimum dielectric loss among all other sample for the same frequeny *** increase in Curie temperature(T_(c))by 50℃ is recorded in the present work by increasing 10%calcium content in SBN *** higher doped samples indicate increase in T_(c) by further higher *** addition,dc conductivity of all samples is measured for all samples and increase in calcium content is observed to generate more insulating compositions compared to undoped SBN with higher intrinsic activation energies.

关键词： Lattice strain microstructure dielectric constant dielectric loss dc conductivity