检索结果-南通市图书馆

Dust Acoustic Compressive Waves in a Warm Dusty Plasma Having Non-Thermal Ions and Non-Isothermal Electrons

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2015年第9期17卷 721-727页

作者： Apul N.DEV Manoj K.DEKA Rajesh SUBEDI jnanjyoti sarma Department of Science and Humanities College of Science and Technology Department of Applied Sciences Institute of Science and TechnologyGauhati University Department of Mathematics R.G.Baruah College

In this article an investigation is presented on the properties of dust acoustic（DA）compressive solitary wave propagation in an adiabatic dusty plasma,including the effect of nonthermal positive and negative ions and non-isothermal *** reductive perturbation method has been employed to derive the lower degree modified Kadomtsev-Petviashivili（mK-P）,3D Schamel-Korteweg-de-Vries equation or modified Kadomtsev-Petviashivili（mK-P） equations for dust acoustic solitary waves in a homogeneous,unmagnetized and collisionless plasma whose constituents are non-isothermal electrons,singly charged positive and negative non-thermal ions and massive charged dust *** stationary analytical solutions of the lower degree mK-P and mK-P equations are numerically analyzed,where the effect of various dusty plasma constituents on DA solitary wave propagation is taken into *** is observed that both the ions in dusty plasma play a key role in the formation of DA compressive solitary waves,and also the ion concentration and non-isothermal electrons control the transformation of the compressive potentials of the waves.

关键词： dusty plasma reductive perturbation method non-isothermal ions compressive solitary wave

Dust Acoustic Shock Waves with Non-Thermal and Vortex-Like Ions in Dusty Plasma

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2015年第4期17卷 268-275页

作者： Apul N.DEV jnanjyoti sarma Manoj K.DEKA Nirab C.ADHIKARY Department of Science and Humanities College of Science and Technology RUB Bhutan Department of Mathematics R. G. Baruah College Guwahati-781025 Assam India Centre of Plasma Physics Tepesia Sonapur Assam India Physical Science Divison Institute of Advanced Study in Science and Technology Vigyan Path Garchuk Guwahati-781035 Assam India

A rigorous investigation is presented on the propagation characteristics of non-linear dust acoustic（DA）waves in an unmagnetized dusty plasma system containing non-thermal and vortex-like ions and Maxwellian electrons under the effect of a fluctuating charged dust *** three-dimensional（3D）Burgers＇equation and a new form of a lower degree modified 3D Burgers＇equation with their analytical solutions are derived to study the features of shock waves in such *** effect of the population of non-thermal ions,the vortex-like ion parameter as well as the temperature ratios of ions and electrons on the evolution of shock waves in the presence of dust charge fluctuation is *** theoretical investigation might be effectively utilized to unveil the nature of many astrophysical plasma environments（Saturn＇s spokes etc.）where such plasmas are reported to have existed.

关键词： dusty plasma reductive perturbation method 3D Burgers' equation modified 3D Burgers' equation tan-hyperbolic method

Investigation of proton structure function F_(2)^(p)at HERA in light of an analytical solution to the Balitsky–Kovchegov equation

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2024年第3期76卷 120-126页

作者： Ranjan Saikia Pragyan Phukan Jayanta Kumar sarma HEP laboratory Department of PhysicsTezpur UniversityTezpurAssam-784028India Department of Physics Moran CollegeMoranhatAssam-785670India

In this paper,the proton structure function F_(2)^(p)(x,Q^(2))at small-x is investigated using an analytical solution to the Balitsky–Kovchegov(BK)*** the context of the color dipole description of deep inelastic scattering(DIS),the structure function F_(2)^(p)(x,Q^(2))is computed by applying the analytical expression for the scattering amplitude N(k,Y)derived from the BK *** transverse momentum k and total rapidity Y,the scattering amplitude N(k,Y)represents the propagation of the quark-antiquark dipole in the color dipole description of *** the BK solution we extracted the integrated gluon density xg(x,Q^(2))and then compared our theoretical estimation with the LHAPDF global data fits,NNPDF3.1sx and ***,we have investigated the behavior of F_(2)^(p)(x,Q^(2))in the kinematic region of 10^(-5)≤x≤10^(-2)and 2.5 GeV^(2)≤Q^(2)≤60 GeV^(2).Our predicted results for F_(2)^(p)(x,Q^(2))within the specified kinematic region are in good agreement with the recent high-precision data for F_(2)^(p)(x,Q^(2))from HERA(H1 Collaboration)and the LHAPDF global parametrization group NNPDF3.1sx.

关键词： quantum chromodynamics(QCD) perturbative QCD(pQCD) proton structure function small-x Balitsky-Kovchegov equation

Metabolic dysfunction-associated steatotic liver disease:A silent pandemic

在线全文

学校读者我要写书评

暂无评论

World Journal of Hepatology 2024年第4期16卷 511-516页

作者： Arghya Samanta Moinak Sen sarma Department of Pediatric Gastroenterology Sanjay Gandhi Postgraduate Institute of Medical SciencesLucknow 226014India

The worldwide epidemiology of non-alcoholic fatty liver disease(NAFLD)is showing an upward trend,parallel to the rising trend of metabolic syndrome,owing to lifestyle *** pathogenesis of NAFLD has not been fully understood ***,NAFLD has emerged as a public health concern in the field of hepatology and metabolisms *** changes in the nomenclature from NAFLD to metabolic dysfunction-associated steatotic liver disease have brought a positive outlook changes in the understanding of the disease process and doctor-patient *** changes are the main treatment ***,clinical trial using drugs that target‘insulin resistance’which is the driving force behind NAFLD,have shown promising *** translational research is needed to better understand the underlying pathophysiological mechanism of NAFLD which may open newer avenues of therapeutic *** role of gut dysbiosis in etiopathogenesis and use of fecal microbiota modification in the treatment should be studied *** of this silent epidemic by spreading awareness and early intervention should be our priority.

关键词： Metabolic dysfunction Fatty liver Obesity Insulin resistance

Fecal microbiota transplantation in the treatment of hepatic encephalopathy:A perspective

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Hepatology 2024年第5期16卷 678-683页

作者： Arghya Samanta Moinak Sen sarma Department of Pediatric Gastroenterology Sanjay Gandhi Postgraduate Institute of Medical SciencesLucknow 226014India

Due to its complex pathogenesis,treatment of hepatic encephalopathy(HE)continues to be a therapeutic *** late,gut microbiome has garnered much attention for its role in the pathogenesis of various gastrointestinal and liver diseases and its potential therapeutic *** evidence suggests that gut micro-biota plays a significant role in cerebral *** in the gut microbiota has been documented in patients with HE in a number of clinical and experimental *** on gut dysbiosis in patients with HE has opened newer therapeutic avenues in the form of probiotics,prebiotics and the latest fecal microbiota transplantation(FMT).Recent studies have shown that FMT is safe and could be effective in improving outcomes in advanced liver disease patients presenting with ***,questions over the appropriate dose,duration and route of administration for best treatment outcome remains unsettled.

关键词： Fecal microbiota Dysbiosis Hepatic encephalopathy Cirrhosis

Hepatic pseudotumor:A diagnostic challenge

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Hepatology 2024年第5期16卷 667-670页

作者： Arghya Samanta Moinak Sen sarma Department of Pediatric Gastroenterology Sanjay Gandhi Postgraduate Institute of Medical SciencesLucknow 226014India

Hepatic pseudotumors are rare lesions of unknown origin,characterized by the proliferation of fibrous connective tissue and inflammatory cell *** mimic malignant lesions clinically,and radiologically,given their non-specific clinical and imaging *** pathophysiology of hepatic pseudotumor is incompletely understood and there are no standardized criteria for *** have been reported to develop in various organs in the body with the lung and liver being the most common *** pseudotumors develop in patients with underlying triggers of liver inflammation and injury,including infections,autoimmune liver diseases,bile duct injury,or *** pse-udotumors respond well to conservative treatment with antibiotics,and steroids and some may regress spontaneously,thus avoiding unnecessary *** condition is rewarding to *** is important to recognize pseudotumor as a distinct clinical entity and include it in the differential of liver masses with atypical imaging features.

关键词： Hepatic pseudotumor Infection Stroglyloides Hepatic resection

A synchronous duty-cycled reservation based MAC protocol for underwater wireless sensor networks

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Digital Communications and Networks 2021年第3期7卷 385-398页

作者： Alak Roy Nityananda sarma Department of Information Technology Tripura UniversityWest TripuraIndia Department of Computer Science and Engineering Tezpur UniversityAssamIndia

To design an energy-efficient Medium Access Control(MAC)protocol for the Underwater Wireless Sensor Networks(UWSNs)is an urgent research issue since depleted batteries cannot be recharged or replaced in the underwater ***,the underwater acoustic channels are affected by hindrances such as long propagation delay and limited bandwidth,which appear in the design of the MAC protocol for the *** available MAC protocols for the terrestrial wireless sensor networks exhibit low performance in energy efficiency,throughput and reliability in the UWSNs,and cannot be used in the UWSNs directly because of their unique *** paper proposes a synchronous duty-cycled reservation-based MAC protocol named Ordered Contention MAC(OCMAC)*** basic mechanism of this protocol is to schedule data transmission by transmitters through the scheduling of Ready To Send(RTS)*** protocol eliminates the possible collision during data transmission and improves communication *** paper analyzes the performance in energy efficiency,throughput and reliability of the protocol by modeling the queuing behavior of OCMAC with a Markov Chain ***,the analytical model is validated through a simulation *** analysis results demonstrated that while providing good throughput and reliability,OCMAC can achieve energy saving.

关键词： Underwater wireless sensor networks MAC protocol Energy efficiency Throughput Reliability Acoustic communication OCMAC

Occurrence of ionization instability associated with plasma bubble in glow discharge magnetized plasma

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and Technology 2019年第11期21卷 29-37页

作者： Mariammal MEGALINGAM Bornali sarma Division of Physics Vellore Institute of Technology

Floating potential fluctuations of glow discharge magnetized plasma are found to expose mixed mode oscillations(MMOs)in the existence of plasma *** bubble has been formed by emerging density gradient in the form of a sheath around a cylindrical and spherical grid to a critical value of applied *** Langmuir probes,LP1 and LP2,are retained in the ambient plasma to collect the plasma floating potential fluctuations at two different locations of the plasma *** perceived instability pattern shows regular-irregular-regular MMOs under various imposed ***,various nonlinear techniques such as phase space plot,recurrence plot and Hurst exponent have been executed to understand the underlying dynamical behavior of the ***-frequency(~200–1200 Hz)oscillations are also supposed and are inferred as ion-acoustic waves excited by ionization *** observed results are then validated with the theory of the instability based on a fluid hydrodynamic approach.

关键词： plasma bubble floating potential fluctuations MMO instability

Calcium regulation of nucleocytoplasmic transport

在线全文

学校读者我要写书评

暂无评论

Protein & Cell 2011年第4期2卷 291-302页

作者： Ashapurna sarma Weidong Yang Department of Biological Sciences Center for Photochemical SciencesBowling Green State UniversityBowling GreenOH 43403USA

Bidirectional trafficking of macromolecules between the cytoplasm and the nucleus is mediated by the nuclear pore complexes(NPCs)embedded in the nuclear envelope(NE)of eukaryotic *** NPC functions as the sole pathway to allow for the passive diffusion of small molecules and the facilitated translocation of larger *** shows that these two transport modes and the conformation of NPC can be regulated by calcium stored in the lumen of nuclear envelope and endoplasmic ***,the mechanism of calcium regulation remains poorly *** this review,we integrate data on the observations of calciumregulated structure and function of the NPC over the past ***,we highlight challenges in the measurements of dynamic conformational changes and transient transport kinetics in the ***,an innovative imaging approach,single-molecule superresolution fluorescence microscopy,is introduced and expected to provide more insights into the mechanism of calcium-regulated nucleocytoplasmic transport.

关键词： nuclear envelope nuclear pore complex nucleocytoplasmic transport calcium stores single-molecule fluorescence microscopy