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Diversity of Middle Eocene Coralline Red Algae from the Prang Limestone(Shella Formation) of Jaintia Hills, Meghalaya, NE Himalaya, India with special emphasis on palaeoenvironment

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科学通报 2013年第S1期58卷 118-125页

作者： GHOSH Amit Kumar sarma ajanta SARKAR Suman Birbal Sahni Institute of Palaeobotany Department of Geology GC College

Palaeocene-Eocene carbonates of shallow marine sequence belonging to Shella Formation of Jaintia Group are well developed in the south of the Jaintia Hills, Meghalaya and represent an excellent outcrop of shelf sediments in North Eastern Himalaya, India. These outcrops are exposed along the southern fringe of Shillong Plateau. The Prang Limestone is the uppermost lithostratigraphic unit of the Shella Formation within the Jaintia Group. It is overlain by sand-shale alternation of the Kopili Formation and underlain by the Narpuh Sandstone. A rich assemblage of larger foraminifera including Nummulites, Discocyclina etc. has been recorded earlier from the Prang Limestone and based on the foraminiferal assemblage, a Middle Eocene to Early Late Eocene age has been assigned to the Prang Limestone. Thin section analysis of the Prang Limestone revealed the abundance of well preserved coralline red algae along with other well preserved and significant biogenic elements. Morpho-taxonomical study reveals that the algal flora is represented by seven species belonging to the families Hapalidiaceae(Subfamily: Melobesioideae), Corallinaceae(Subfamily: Mastophoroideae) and Sporolithaceae. The dominance of melobesioid and mastophoroid forms is the characteristic feature of this algal assemblage. Coralline algae occur mostly in encrusting growth form with orbitoid foraminifera and occasionally the coralline algae form rhodoliths. On this basis of algal forms it can be inferred that they thrived in a shallow, warm, shelf environment of normal salinity.

关键词： diversity Coralline algae taxonomy Middle Eocene Shella Formation Meghalaya NE Himalaya India

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

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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

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Coarsening droplets for frosting delay on hydrophilic slippery liquid-infused porous surfaces

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Droplet 2024年第2期3卷 95-104页

作者： Jyotirmoy sarma Deepak Monga Zongqi Guo Fangying Chen Xianming Dai Department of Mechanical Engineering The University of Texas at DallasRichardsonTexasUSA

Frosting occurs due to the freezing of condensed water droplets on a supercooled *** nucleated frost propagates through interdroplet bridges and covers the entire surface,resulting from the deposition of highly supersaturated vapor surrounding tiny *** inhibition of the formation of frost bridges is not possible,the propagation of frost can be delayed by effectively removing tiny *** technologies,such as superhydrophobic surfaces(SHS)and hydrophobic slippery liquid-infused porous surfaces(SLIPS),rely on static growth and direct contact with densely distributed ***,use of these approaches in delaying frost propagation involves challenges,as the interdroplet distance remains ***,we report a new approach of spontaneous droplet movement on hydrophilic SLIPS to delay the formation of interdroplet frost *** tension forces generated by the hydrophilic oil meniscus of a large water droplet efficiently pull neighboring droplets with a diameter of less than 20μm from all *** causes a dynamic separation between water droplets and an adjacent frozen *** a process delays the formation and propagation of interdroplet frost ***,there is significant delay in frosting on hydrophilic SLIPS compared to those on SHS and hydrophobic SLIPS.

关键词： delay bridges propagation

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Metabolic dysfunction-associated steatotic liver disease:A silent pandemic

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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

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

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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

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Hepatic pseudotumor:A diagnostic challenge

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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

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离子匹配悬浮液驱提高碳酸盐岩油藏波及效率潜力与机理实验

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石油科学通报 2024年第1期9卷 89-102页

作者：彭颖锋朱光亚刘照伟廖旋 HEMANTA sarma 雷征东李宜强中国石油勘探开发研究院北京100083 中国石油(伊拉克)哈法亚公司北京100032 卡尔加里大学卡尔加里T2N1N4 中国石油大学(北京) 北京102249

水驱波及效率提升可以显著增强碳酸盐岩油藏开发效果。本文在考虑地层水离子组成基础上,借助体视显微镜和激光粒度仪配制了一种离子匹配悬浮液,其中悬浮的硫酸钙颗粒处于临界饱和状态,大部分颗粒粒径在10μm左右,静置后由于絮凝和聚集... 详细信息

水驱波及效率提升可以显著增强碳酸盐岩油藏开发效果。本文在考虑地层水离子组成基础上,借助体视显微镜和激光粒度仪配制了一种离子匹配悬浮液,其中悬浮的硫酸钙颗粒处于临界饱和状态,大部分颗粒粒径在10μm左右,静置后由于絮凝和聚集作用最大可到50μm。悬浮液的静态性质实验表明,由于硫酸钙“逆溶解度”特征和水合物的变化,其微粒会在小于45℃范围缓慢消失,并在90℃时迅速析出;矿化度和离子组成改变会使硫酸钙微粒浓度和粒径显著增大。在渗透率级差为4.7的岩心并联实验中,离子匹配悬浮液可使较低渗岩心的分流率最大提高约9.8%,最终采收率提高约4.3%。温度、压力和盐度的影响,以及注入水与地层水离子交换,使悬浮液中的饱和硫酸钙周期性溶解和沉淀,导致压力波动。压力波动使硫酸钙的溶解/沉淀特征复杂化,最终显著改变了水驱后期并联模型中的分流率。含有饱和硫酸钙的不稳定离子匹配悬浮液是从材料领域借鉴到石油领域的新尝试,具有一定提高波及效率作用。它比常规欠饱和离子匹配水驱过程中产生的不可控原位微粒更有效、更可靠、更环保。

关键词：碳酸盐岩油藏提高采收率波及效率悬浮液硫酸钙

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

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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

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

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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

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Calcium regulation of nucleocytoplasmic transport

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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

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