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Effect of Gravity on Collective Excitations of a Quasi Two-Dimensional Bose Einstein Condensate in an Anharmonic Trap

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Communications in Theoretical Physics 2011年第10期56卷 669-671页

作者： P.D.Anoop ramesh Babu Thayyullathil Department of Physics Cochin University of Science and TechnologyCochin 682022KeralaIndia

Abstract Using variational method, the wave function of a quasi two-dimensional Bose-Einstein Condensate in an anharmonic trap is analyzed and the influence of gravity on the eollective excitations is studied. It is f... 详细信息

关键词： Bose-Einstein condensation variational method collective excitations

Study on the Performance Deterioration of Mixed Flow Impeller due to Change in Tip Clearance

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Journal of Thermal Science 2013年第6期22卷 532-538页

作者： ramesh Rajakumar.D Ramamurthy.S Govardhan.M National Aerospace Laboratories-Bangalore-560017 NCAD National Aerospace Laboratories Thermal Turbomachines laboratory Department of Mechanical EngineeringIndian Institute of Technology Madras

Performance of mixed flow compressor with un-shrouded impeller strongly depends upon unsteady, asymmetrical flow fields in the axial directions. The flow through the mixed flow impeller is complex due to three-dimensional nature of geometry. In mixed flow impeller, there are clearances between the rotating impeller blades and the casing as the high pressure ratio compressors are usually open shrouded impellers. As a result, certain amount of reduction in the performance is unavoidable due to clearance flows. In the present investigations, numerical analysis is performed using a commercial code to investigate tip clearance effects on through flow. The performance of mixed flow impeller with four different clearances between impeller and stationary shroud are evaluated and compared with experimental results. The impeller performance map was obtained for different operating speeds and mass flow rates with different tip clearances. The result shows that the tip leakage flow strongly interacts with mainstream and contributes to total pressure loss and performance reduction. The pressure and performance decrement are approximately linearly proportional to the gap between impeller and stationary *** analysis showed scope for improvement in design of the compressor for better performance in terms of efficiency and operating range.

关键词： Mixed Flow Compressor Surge Stall Choke CFD Tip Clearance Compressible Flow Periodic Grids and Jet-Wake

Influenza B infections in children:A review

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World Journal of Clinical Pediatrics 2020年第3期9卷 44-52页

作者： Yellanthoor ramesh Bhat Department of Pediatrics Kasturba Medical CollegeManipal Academy of Higher EducationManipalKarnataka 576104India

Influenza B(IFB)virus belongs to the Orthomyxoviridae family and has two antigenically and genetically distinct lineages;B/Victoria/2/87-like(Victoria lineage)and B/Yamagata/16/88-like(Yamagata lineage).The illness caused by IFB differs from that caused by influenza *** of IFB occur worldwide and young children exposed to IFB are likely to have a higher disease severity compared with *** mostly causes mild to moderate respiratory illness in healthy ***,the involvement of other systems,a severe disease especially in children with chronic medical conditions and immunosuppression,and rarely mortality,has been *** with oseltamivir or zanamivir decreases the severity of illness and *** to the enormous health and economic impact of IFB,these strains are included in *** illness is less studied in children although its impact is *** this review,the epidemiology,clinical manifestations,treatment,prognosis,and prevention of IFB illness in children are discussed.

关键词： Children Influenza B Hospitalization Oseltamivir Respiratory infections Severity

Grasshopper optimization algorithm optimized multistage controller for automatic generation control of a power system with FACTS devices

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Protection and Control of Modern Power Systems 2021年第1期6卷 109-123页

作者： Pratap Chandra Nayak ramesh Chandra Prusty Sidhartha Panda Department of Electrical Engineering VSSUTBurlaOdisha768018India

This paper uses a Grasshopper Optimization Algorithm (GOA) optimized PDF plus (1 + PI) controller for Automatic generation control (AGC) of a power system with Flexible AC Transmission system (FACTS) devices. Three differently rated reheat turbine operated thermal units with appropriate generation rate constraint (GRC) are considered along with different FACTS devices. A new multistage controller design structure of a PDF plus (1 + PI) is introduced in the FACTS empowered power system for AGC while the controller gains are tuned by the GOA. The superiority of the proposed algorithm over the Genetic Algorithm (GA) and Particle Swarm Optimization (PSO) algorithms is demonstrated. The dynamic responses of GOA optimized PDF plus (1 + PI) are compared with PIDF, PID and PI controllers on the same system. It is demonstrated that GOA optimized PDF plus (1 + PI) controller provides optimum responses in terms of settling time and peak deviations compared to other controllers. In addition, a GOA-tuned PDF plus (1 + PI) controller with Interline Power Flow Controller (IPFC) exhibits optimal results compared to other FACTS devices. The sturdiness of the projected controller is validated using sensitivity analysis with numerous load patterns and a wide variation of parameterization. To further validate the real-time feasibility of the proposed method, experiments using OPAL-RT OP5700 RCP/HIL and FPGA based real-time simulations are carried out.

关键词： Automatic generation control FACTS devices Multistage controller Grasshopper optimization algorithm

Non-alcoholic Fatty Liver Disease:Growing Burden, Adverse Outcomes and Associations

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Journal of Clinical and Translational Hepatology 2020年第1期8卷 76-86页

作者： ramesh Kumar Rajeev Nayan Priyadarshi Utpal Anand Department of Gastroenterology All India Institute of Medical SciencesPatnaIndia Department of Radiodiagnosis All India Institute of Medical SciencesPatnaIndia Department of Surgical Gastroenterology All India Institute of Medical SciencesPatnaIndia

Nonalcoholic fatty liver disease(NAFLD)is a systemic disor-der with a complex multifactorial pathogenesis and hetero-genous clinical ***,once believed to be an innocuous condition,has now become the most common cause of chronic liver disease in many countries *** is already highly prevalent in the general population,and owing to a rising incidence of obesity and diabetes mellitus,the incidence of NAFLD and its impact on global healthcare are expected to increase in the future.A subset of patients with NAFLD develops progressive liver disease lead-ing to cirrhosis,hepatocellular carcinoma,and liver *** has emerged as one of the leading causes of cirrhosis and hepatocellular carcinoma in recent ***,HCC can occur in NAFLD even in absence of *** with the general population,NAFLD increases the risk of liver-related,cardiovascular and all-cause *** is bidirectionally associated with metabolic *** increases the risk and contributes to aggravation of the pathophysiology of atherosclerosis,cardiovascular diseases,diabetes mellitus,and chronic kidney *** addition,NAFLD is linked to colorectal polyps,polycystic ovarian syndrome,osteoporosis,obstructive sleep apnea,stroke,and various extrahepatic *** resection of steatotic liver is associated with increased risk of liver failure and *** is an increasing trend of NAFLD-related cirrhosis requiring liver transplantation,and the recurrence of NAFLD in such patients is almost *** review discusses the growing burden of NAFLD,its outcomes,and adverse associations with various diseases.

关键词： NAFLD NASH Metabolic Outcome Association

Effect of Phase Shifted Frequency Modulation on Two Level Atom-Field Interaction

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Communications in Theoretical Physics 2012年第3期57卷 468-472页

作者： K.V.Priyesh ramesh Babu Thayyullathil Department of Physics Cochin University of Science and Technology

We have studied the effect of phase shifted frequency modulation on two level atom with field interaction using Jaynes-Cummings *** the frequency of the interacting field is sinusoidally varying with time with a constant *** to the presence of phase in the frequency modulation,the variation of population inversion with time is different from the standard *** are no exact collapses and revivals in the variation of population inversion but it oscillates sinusoidally with *** coherent field atom interaction the population inversion behaves as in the case of Fock state atom interaction,when frequency modulation with a non zero phase is *** study done with squeezed field has shown the same behavior of the population inversion.

关键词： Jaynes-Cummings model two level atom squeezed field

Motive-based segmentation of international tourists at Gaurishankar Conservation Area,Nepal

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Journal of Mountain Science 2021年第1期18卷 205-218页

作者： Rojan BANIYA Brijesh THAPA ramesh PAUDYAL Suman Shree NEUPANE Department of Tourism Hospitality and Event ManagementUniversity of FloridaGainesvilleFL 32611-8208USA School of Hospitality and Tourism Management Oklahoma State UniversityStillwaterOK 74078USA School of Forest Resources and Conservation University of FloridaGainesvilleFL 32611USA Kathmandu Forestry College Tribhuvan UniversityKathmandu 44600Nepal

Gaurishankar Conservation Area(GCA)is a recently established natural-based protected area in Nepal,which has witnessed an increase in international *** optimize visitor experience,it is essential to examine motivations to visit along with visitors’characteristics and behavioral *** purpose of this study was to examine international tourists via a motive-based segmentation approach for *** addition,the study also intended to identify visitor segments’profile characteristics such as socio-demographic,travel behaviors,satisfaction,loyalty intention,and their willingness to pay for higher entrance ***(N=121)were collected among international tourists visiting GCA either as a primary destination or as a transit *** identified three distinct segments of visitors–‘local art and culture enthusiast’,‘escapist’,and‘nature adventurer.’Each cluster was different with regards to their sociodemographics,travelbehavior,satisfaction,willingness to revisit and recommend,and willingness to pay to support the environment and cultural resources,and local *** insights gained from motive-based segmentation can be beneficial to GCA to develop specific products and promotions and incorporate visitor monitoring&management programs.

关键词： Nature-based tourism Parks Protected areas Motivations Motive-based segmentation Visitor management

Private Sector Participation in Electricity Generation and Distribution

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Small Hydro Power News 2005年第82期22卷 14-21页

作者： ramesh C Arya South Asia Watch on Trade Economics and Environment （SAWTEE） PO Box 4360 Kathmandu Nepal

In terms of hydropower resources in the country, Nepal ranks second in the world. But it has not acted seriously in terms of utilization. The effort began from the Rana days when they ruled the country for more than century. For energy, unfortunately, the country has at times sought thermal source rather than *** energy needs, it first depended upon foreign aid in the earlier dates. As late as in the ＇60s, it depended upon such assistance rather than developing its own. So much so, that it imported electrical power from neighbouring country. Later, it was developed both under foreign aid as well the multilateral assistance and loan. The electricity generation gradually became more and more costly. Only later, genuine private sectors have joined the energy market. But the terms and conditions have not always been in the national interest. There is a wide variation in cost of energy under different conditions of power development in the country, from the cheapest to the costliest. Both for generation and distribution, Nepal Electric Corporation should no longer continue its *** sector should be promoted given more role to play for economy and *** paper discusses the different options available and practised in Nepal.

关键词：水电站电力需求水能河流水力发电尼泊尔

Age-at-injury effects of microglial activation following traumatic brain injury： implications for treatment strategies

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Neural Regeneration Research 2017年第5期12卷 741-742页

作者： ramesh Raghupathi Jimmy W.Huh Program in Neuroscience Drexel University College of Medicine Philadelphia PA USA Department of Neurobiology and Anatomy Drexel University College of Medicine Philadelphia PA USA Department of Anesthesiology and Critical Care Children'sHospital of Philadelphia Philadelphia PA USA

Traumatic brain injury（TBI）remains one of the leading causes of disability and death in infants and *** have demonstrated that the youngest age group（especially≤4 years old）exhibit worse functional outcome following moderate to severe TBI compared to older children or adults（Anderson et al.,2005;Emami et al.,2017）.These data suggest that age-at-injury may be an important determinant of outcome,

关键词： TBI Age-at-injury effects of microglial activation following traumatic brain injury implications for treatment strategies