检索结果-南通市图书馆

Pre-breakdown to stable phase and origin of multiple current pulses in argon dielectric barrier discharge

Plasma Science and Technology 2021年第12期23卷 83-94页

作者： saurav gautam Gabriele MORRA Department of Mechanical Engineering University of California MercedMercedCalifornia 95343United States of America Department of Physics University of Louisiana at LafayetteLafayetteLouisiana 70503United States of America

We report on the results of numerical models of the(i)initial growth and(ii)steady state phases of atmospheric-pressure homogeneous dielectric barrier discharge in *** employ our new inhouse code called Py DBD,which solves continuity equations for both particles and energy,shows exceptional stability,is accelerated by adaptive time stepping and is openly available to the scientific *** argon plasma is numerically challenging due to the lower speeds of more inertial ions compared to more commonly modeled neon and helium,but its common use for plasma jets in medicine makes its modeling *** DBD is here applied to modeling two setups:(i)the exponential growth from natural electron-ion seeds(onset phase)until saturation is reached and(ii)the multiple current pulses that naturally appear during the steady state *** find that the time required for the onset phase,when the plasma density grows from 10^(9)m^(-3)to 10^(17)m^(-3),varies from 80μs at 4.5 k V down to a fewμs above 6.5 k V,for voltage frequency f=80 k Hz and gap width d_(g)=0.9 *** the steady state,our model reproduces two previously observed features of the current in dielectric barrier discharge reactors:(1)an oscillatory behavior associated to the capacitative character of the circuit and(2)several(N_(p))current pulses occurring every half sinusoidal *** show that the oscillations are present during the exponential growth,while current pulses appear approaching the steady *** each micro-discharge,the gas voltage decreases abruptly and charged particles rapidly accumulate at the dielectric boundaries,causing avalanches of charged particles near the reactor ***,we run a parametric study finding that N_(p)increases linearly with voltage amplitude V_(amp),is inversely proportional to dielectric gap d_(g)and decreases when voltage frequency f *** code developed for this publication is freely available at the address https://***/gabers

关键词： plasma onset micro-discharge multiple current pulse(MCP) discharge asymmetry seed electrons

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Progress in targeted delivery of siRNA to combat Coxsackievirus

引用

Protein & Cell 2011年第11期2卷 855-857页

作者： Anju gautam Institute of Microbiology Chinese Academy of SciencesBeijing 100101China

Cardiovascular disease is one of the major causes of human death and has been linked to different risk *** pathogens have been found to be involved in myocardial *** these,Coxsackievirus B3(CVB3)is one of the most important causes of virus-induced myocarditis(Henke et al.,2003).CVB3 is a member of the genus Enterovirus,within the family *** importance of CVB3 is reflected in the data from the World Health Organization global surveillance of viral diseases,where the coxsackie virus B was ranked the number one cause of clinically evident cardiovascular diseases(Grist and Reid,1993).

关键词： CVB3 al. diseases

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Role of projectile breakup effects and intrinsic degrees of freedom on fusion dynamics

引用

Chinese Physics C 2016年第5期40卷 24-33页

作者： Manjeet Singh gautam Department of Physics Indus Degree CollegeKinanaJind-126102(Hargana)India

This article analyzes the fusion dynamics of loosely bound and stable projectiles with Zr-target isotopes within the context of the coupled channel approach and the energy-dependent Woods-Saxon potential model （EDWSP model）. In the case of the 2SSi＋90Zr reaction, the coupling to the inelastic surface excitations results in an adequate description of the observed fusion dynamics while in case of the 2Ssi ＋ 94Zr reaction, the coupling to collective surface vibrational states as well as the neutron （multi-neutron） transfer channel is necessary in the coupled channel calculations to reproduce the below-barrier fusion data. However, the EDWSP model calculation provides an accurate explanation of the fusion data of 2Ssi＋ 90,94Zr reactions in the domain of the Coulomb barrier. In the fusion of the 6Li＋90Zr reaction, the inclusion of the nuclear structure degrees of freedom recovers the observed sub-barrier fusion enhancement but results in suppression of the above barrier fusion data by 34% with respect to the coupled channel calculations. Using EDWSP model calculations, this suppression factor is reduced by 14% and consequently, the above-barrier fusion data of 6Li＋90Zr reaction is suppressed by 20% with reference to the EDWSP model calculations. Such fusion suppression at above-barrier energies can be correlated with the breakupof the projectile （6Li） before reaching the fusion barrier, as a consequence of low binding energy.

关键词： heavy-ion sub-barrier fusion reactions coupled channel equations weakly bound nuclei

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Entrance Channel Mass Asymmetry Effects in Sub-Barrier Fusion Dynamics by Using Energy Dependent Woods–Saxon Potential

引用

Communications in Theoretical Physics 2015年第12期64卷 710-718页

作者： Manjeet Singh gautam School of Physics and Material Science Thapar University

The present article highlights the inconsistency of static Woods Saxon potential and the applicability of energy dependent Woods Saxon potential to explore the fusion dynamics of ^(48)_(22)Ti+^(58,60,64)_(28)Ni,^(46)_(22)Ti+^(64)_(28)Ti+^(50)_(22)Ti+^(60)_(28)Ni,and^(19)_9F+^(93)_(41)Nb reactions leading to formation of different Sn-isotopes via different entrance *** calculations based upon one-dimensional Wong formula obtained by using static Woods Saxon potential unable to provide proper explanation for sub-barrier fusion enhancement of these projectile-target ***,the predictions of onedimensional Wong formula based upon energy dependent Woods Saxon potential model(EDWSP model) accurately describe the observed fusion dynamics of these systems wherein the significantly larger value of diffuseness parameter ranging from a = 0.85 fm to a = 0.97 fm is required to address the experimental data in whole range of ***,the energy dependence in nucleus-nucleus potential simulates the influence of the nuclear structure degrees of freedom of the colliding pairs.

关键词： depth and diffuseness of Woods–Saxon potential hea

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Static versus energy-dependent nucleus–nucleus potential for description of sub-barrier fusion dynamics of _8^(16)O+_(50)^(112,116,120)Sn reactions

引用

Chinese Physics C 2015年第11期39卷 36-44页

作者： Manjeet Singh gautam School of Physics and Material Science Thapar University

The static and energy-dependent nucleus–nucleus potentials are simultaneously used along with the Wong formula for exploration of fusion dynamics of 8^16O＋50^112,116,120Sn reactions. The role of internal structure degrees of freedom of colliding pairs, such as inelastic surface vibrations, are examined within the context of coupled channel calculations performed using the code CCFULL. Theoretical calculations based on the static Woods–Saxon potential along with the one-dimensional Wong formula fail to address the fusion data of 8^16O＋50^112,116,120Sn *** discrepancies can be removed if one uses couplings to internal structure degrees of freedom of colliding ***, the energy-dependent Woods–Saxon potential model（EDWSP model） accurately describes the sub-barrier fusion enhancement of 8^16O＋50^112,116,120Sn reactions. Therefore, in sub-barrier fusion dynamics, energy dependence in the nucleus–nucleus potential governs barrier modification effects in a closely similar way to that of the coupled channel approach.

关键词： heavy-ion sub-barrier fusion reactions depth and diffuseness Woods Saxon potential diffuseness anomaly

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Inflammatory bowel disease in India- Past, present and future

引用

World Journal of Gastroenterology 2016年第36期22卷 8123-8136页

作者： gautam Ray Gastroenterology Unit Department of Medicine B.R.Singh Hospital

There is rising incidence and prevalence of inflammatory bowel disease(IBD) in India topping the Southeast Asian(SEA) countries. The common genes implicated in disease pathogenesis in the West are not causal in Indian patients and the role of "hygiene hypothesis" is unclear. There appears to be a North-South divide with more ulcerative colitis(UC) in north and Crohn's disease(CD) in south India. IBD in second generation Indian migrants to the West takes the early onset and more severe form of the West whereas it retains the nature of its country of origin in migrants to SEA countries. The clinical presentation is much like other SEA countries(similar age and sex profile, low positive family history and effect of smoking, roughly similar disease location, use of aminosalicylates for CD, low use of biologics and similar surgical rates) with some differences(higher incidence of inflammatory CD, lower perianal disease, higher use of aminosalicylates and azathioprine and lower current use of corticosteroids). UC presents more with extensive disease not paralleled in severity clinically or histologically, follows benign course with easy medical control and low incidence of fulminant disease, cancer, complications, and surgery. UC related colorectal cancer develop in an unpredictable manner with respect to disease duration and site questioning the validity of strict screening protocol. About a third of CD patients get antituberculosis drugs and a significant number presents with small intestinal bleed which is predominantly afflicted by aggressive inflammation. Biomarkers have inadequate diagnostic sensitivity and specificity for both. Pediatric IBD tends to be more severe than adult. Population based studies are needed to address the lacunae in epidemiology and definition of etiological factors. Newer biomarkers and advanced diagnostic techniques(in the field of gastrointestinal endoscopy, molecular pathology and genetics) needs to be developed for proper disease definiti

关键词： Inflammatory bowel disease Ulcerative colitis Crohn’s disease India Review

来源：

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

Lockdown during COVID-19 pandemic:A case study from Indian cities shows insignificant effects on persistent property of urban air quality

引用

Geoscience Frontiers 2022年第6期13卷 347-358页

作者： Asha Chelani Sneha gautam Air Pollution Control Division CSIR-National Environmental Engineering Research Institute(CSIR-NEERI)Nehru MargNagpur 440020India Karunya Institute of Technology and Sciences Coimbatore-641114Tamil NaduIndia

The influence of reduction in emissions on the inherent temporal characteristics of PMand NOconcentration time series in six urban cities of India is assessed by computing the Hurst exponent using Detrended Fluctuation Analysis(DFA) during the lockdown period(March 24–April 20, 2020) and the corresponding period during the previous two years(i.e., 2018 and 2019). The analysis suggests the anticipated impact of confinement on the PMand NOconcentration in urban cities, causing low concentrations. It is observed that the original PMand NOconcentration time series is persistent but filtering the time series by fitting the autoregressive process of order 1 on the actual time series and subtracting it changes the persistence property significantly. It indicates the presence of linear correlations in the PMand NOconcentrations. Hurst exponent of the PMand NOconcentration during the lockdown period and previous two years shows that the inherent temporal characteristics of the short-term air pollutant concentrations(APCs) time series do not change even after withholding the emissions. The meteorological variations also do not change over the three time periods. The finding helps in developing the prediction models for future policy decisions to improve urban air quality across cities.

关键词： Urban air quality Lockdown Persistence Temporal correlations

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Management of liver diseases:Current perspectives

引用

World Journal of Gastroenterology 2022年第40期28卷 5818-5826页

作者： gautam Ray Gastroenterology Unit Department of MedicineB.R.Singh(Railway)HospitalKolkata 700014West BengalIndia

There is increasing incidence and prevalence of acute and chronic liver diseases(CLDs)all over the world which influence the quality of life and can give rise to life threatening *** burden of advanced liver disease due to hepatitis B has been controlled by antivirals but its eradication is difficult *** effective directly acting antiviral therapy has reduced the burden of hepatitis C but is partially offset by increasing IV drug ***-alcoholic fatty liver disease pandemic is on and there is recent alarming increase in alcohol related liver disease,both of which have no drug cure apart from control of the risk *** factors have been identified in progression of all forms of *** to better management of complications of CLD,the life span of patients have increased spiking the number of hepatocellular carcinoma(HCC)and patients needing liver transplantation(LT).The present severe acute respiratory syndrome coronavirus pandemic has affected the outcome CLD including LT in addition to causing acute *** diagnostics and therapeutics are available for liver fibrosis,portal hypertension,HCC and post LT management and many drugs are under *** present review summarises the current scenario of the epidemiology and the advances in diagnosis and treatment of liver diseases including their complications like portal hypertension,HCC and LT.

关键词： Chronic liver disease Genes Biomarkers Therapy Hepatocellular carcinoma Liver transplantation Recent advances

来源：

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

Anisotropic FCGR behaviour in hot-rolled Mg-3Al-0.5Ce alloy

引用

Journal of Magnesium and Alloys 2024年第7期12卷 2985-3002页

作者： Prakash C.gautam Somjeet Biswas Light Metals and Alloys Research Lab Department of Metallurgical and Materials EngineeringIndian Institute of Technology KharagpurKharagpurWest Bengal 721302India Institut für Metallkunde und Materialphysik(IMM) Rheinisch-Westfälische Technische Hoschule Aachen52074 AachenGermany

In this work,anisotropic fatigue crack growth rate(FCGR)behaviour in a hot-rolled Mg-3wt%Al-0.5wt%Ce alloy was investigated using compact tension(CT)specimens with notch(an)parallel to the rolling direction(RD)and transverse direction(TD).The FCGR tests were conducted at a constant load ratio(R=0.1)and maximum stress intensity factor(KMax=15.6 MPa√m)to investigate the crack closure *** both constant R and KMax conditions:(i)the load-displacement curves for every loading cycle were linear for a_(n)∥ to RD and TD,indicating no crack closure;(ii)the FCGR was found to be lower for an∥RD than an∥TD over the entire stress intensity factor range(△K).The hot-rolled sample contained long-aligned Al11Ce3 intermetallic phase within grain boundaries that are elongated along *** the FCGR test,{10.12}extension twins(ET)with lamellae∼⊥and c-axis∼∥to these elongated intermetallics along RD developed irrespective of the notch *** the loading cycle,these intermetallics along RD generate back-stresses,reducing the in-plane tensile stress∼||and∼⊥to crack-tip to∼0 for a_(n)∥to RD and TD,***,lenticular ET∼||⊥and∼||,with c-axis∼||and∼⊥to crack path activates,leading to trans and inter lamellar crack for anto RD and TD,respectively,and anisotropic *** crack in a_(n)∥RD reduces the FCGR due to plastic energy dissipation as perceived by comparatively more geometrically necessary boundaries(GNBs).On the other hand,faster FCGR was obtained for a_(n)∥TD due to interlamellar ***,the crack growth through the matrix-ET interfaces was favoured due to strain *** Fractography for a_(n)∥RD shows smaller elongated grooves along crack propagation,which indicates crack ***,larger elongated grooves for a_(n)||TD indicated easy crack propagation due to favourable interlamellar crack.

关键词： Fatigue crack growth rate(FCGR) Magnesium(Mg) Intermetallics Extension twins Crack closure

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

N-Methylpyridinium tosylate catalyzed green and efficient synthesis of some novel 2,4-disubstituted thiazoles and 4-thiazolidinones

引用

Chinese Chemical Letters 2012年第11期23卷 1221-1224页

作者： Deepika gautam Poonam gautam R.P.Chaudhary Department of Chemistry Sant Longowal Institute of Engineering&TechnologyLongowalSangrurPunjab 148106India

A convenient solvent less cyclocondensation from thiosemicarbazone of benzofuranone and chloroacetic acid using an ionic liquid, N-methylpyridinium tosylate for obtaining novel 4-thiazolidinones in excellent yields is reported. Also, the green expedient synthesis of new 2,4-disubstituted thiazoles under grinding condition from phenacyl bromides and thiosemicarbazide derivatives in quantitative yields is reported.

关键词： 4-Thiazolidinones Thiazoles Grinding Ionic liquid Cyclocondensation Thiosemicarbazones

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：