检索结果-南通市图书馆

Time-dependent diffusive interactions between dark matter and dark energy in the context of k-essence cosmology

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2021年第1期21卷 15-24页

作者： Abhijit bandyopadhyay Anirban Chatterjee Department of Physics Ramakrishna Mission Vivekananda Educational and Research InstituteBelur MathHowrah 711202India

We investigated the scenario of time-dependent diffusive interaction between dark matter and dark energy and showed that such a model can be accommodated within the observations of luminosity distanceredshift data in Supernova la(SN la)observations.We obtain constraints on different relevant parameters of this model from the observational data.We consider a homogeneous scalar field(t)driven by a k-essence Lagrangian of the form L=V(φ)F(X)with constant potential V(φ)=V,to describe the dynamics of dark energy in this model.Using the temporal behaviour of the FRW scale factor,the equation of state and total energy density of the dark fluid,extracted from the analysis of SN la(JLA)data,we have obtained the time-dependence of the k-essence scalar field and also reconstructed the form of the function F(X)in the k-essence Lagrangian.

关键词： Dark Energy Dark Matter k-essence

From occupants to occupants:A review of the occupant information understanding for building HVAC occupant-centric control

在线全文

学校读者我要写书评

暂无评论

Building Simulation 2022年第6期15卷 913-932页

作者： Tao Yang Arkasama bandyopadhyay Zheng O’Neill Jin Wen Bing Dong mike walker’66 department of mechanical engineering texas a&m universitycollege stationtx77843usa department of civil architectural&environmental engineeringdrexel universityphiladelphiapa19104usa department of mechanical and aerospace engineering syracuse universitysyracuseny13244usa

Occupants are the core of the built environment.Traditional heating,ventilation,and air-conditioning(HVAC)systems operate with predefined schedules and maximum occupancy assumptions with no consideration of specific occupant information.These generalized assumptions usually do not align with the actual demand and result in over-conditioning and occupant discomfort.In recent years,with the aid of Information&Communication Technology(ICT)and Computer Science(CS),it is possible to acquire real-time and accurate occupant information to satisfy the exact thermal requirement through specific HVAC control in one particular built environment.This mechanism is called HVAC“Occupant-centric Control(OCC).”HVAC OCC strategy starts with collecting the occupant’s information(e.g.,presence/absence)and then applies it to meet the occupant’s requirement(e.g.,thermal comfort).However,even though some research studies and field pilot demonstrations have been devoted to the field of OCC,there is a lack of systematic knowledge about occupant data,which is the principal component of OCC for HVAC researchers and practitioners.To fill this gap,this review paper discusses OCC with a particular emphasis on occupant information and investigates how this information can assist HVAC operation in providing an acceptable built environment in required spaces during the required time.We provide a fine-grained,comprehensive picture of occupant information,discuss its features,the modalities of information feed-in into the HVAC control,and the application of commonly utilized occupant information for OCC.

关键词： occupant information occupant-centric control smart building HVAC energy efficiency

Dependence of fluid flow on cleat aperture distribution and aperture–length scaling: a case study from Gondwana coal seams of Raniganj Formation, Eastern India

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Coal Science & Technology 2020年第1期7卷 133-146页

作者： Krishanu bandyopadhyay Jyotirmoy Mallik Trishit Ghosh Indian Institute of Science Education and Research BhopalIndia Coal India Limited.Asansol.India

Dimensions and mutual relationships amongst fracture(cleat)parameters such as maximum aperture width,average aperture width,length,spacing etc.control the connectivity within a fracture network and the fluid flow in a coal seam as the matrix permeability,here,is negligible.In this paper,we document cleat size distributions and investigate length–aperture relationships from coals of Raniganj coalfield in Eastern India.This coalfield has a proven extractable reserve of six billion tons of coal and holds immense potential to be one of the largest coal bed methane fields serving India’s growing energy needs.Here,cleat length(L)correlates with corresponding maximum aperture width(Dmax)in a power-law function with an exponent of 0.84(DmaxαL0.84)instead of the commonly observed exponents of 1 or 0.5 applicable for other natural‘opening-mode’fractures.The conventional wisdom pertains that laminar fluid flow(Q)through an isolated,smooth-walled,parallel-plate fracture,embedded in an impermeable matrix,is directly proportional to the cube of its aperture width(b,equivalent to Davg;cubic law:Qαb3).This assumes a linear relationship between length and fracture aperture.However,the modified relationship between cleat length and average aperture width changes the cubic law applicable for Raniganj coal seam and now fluid flow correlates with aperture width in a power-law function with an exponent of 4.25(Qαb4.25)instead of 3(cube).Such simplifications will come handy for the modeling and estimation of fluid flow as it will reduce the effort of cleat length measurement which is anyway difficult and can be misleading due to the risk of undersampling.

关键词： CBM Cleat Coal Permeability Raniganj

Vitamin C and E supplementation and high intensity interval training induced changes in lipid profile and haematological variables of young males

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Sports Medicine and Health Science 2023年第2期5卷 137-145页

作者： Surojit Sarkar Swapan Kr Dey Gouriprosad Datta Amit bandyopadhyay Department of Physiology Rammohan College1021Raja Ram Mohan SaraniBaithakkhanaKolkata700009West BengalIndia Department of Sports Science University of CalcuttaUniversity Colleges of Science and Technology92A.P.C.RoadKolkata700009West BengalIndia Sports and Exercise Physiology Laboratory Department of PhysiologyUniversity of CalcuttaUniversity Colleges of Science and Technology92A.P.C.RoadKolkata700009West BengalIndia

High intensity interval training(HIIT)causes oxidative stress and haematological alteration.Present study was aimed to evaluate the effect of 8 weeks’supplementation of vitamin C and E on HIIT induced changes in lipid profile parameters and haematological variables.Hundred six male adolescent players were randomly assigned into five age-matched groups,i.e.,Control(no exercise+placebo),HIIT(placebo),HIIT+vitamin-C(1000mg/day),HIIT+vitamin-E 400 IU/day)and combined HIIT+vitamin C and E.Morning and evening sessions(90min)of HIIT included 4 phases(15min each)with 3 sets(4min each).Each 4min HIIT set consisted of 2min intense sprint workout(90%–95%of heart rate maximum[HRmax])followed by 1min active recovery(60%–70%HRmax)followed by 1min of complete rest(1:1 work-rest ratio).Lipid profile parameters,haematological variables,endurance capacity and vertical jump were evaluated by standard protocols.Significant decrease in body weight,fat%,total cholesterol,triglyceride,Total Cholesterol/High Density Lipoprotein-Cholesterol and significant increase in High Density Lipoprotein-Cholesterol,maximal oxygen consumption,vertical jump were observed for all four intervention groups.White blood cell count,red blood cell count,haemoglobin percentage and haematocrit values were significantly decreased while platelet count and platelet-to-leukocyte ratio(PLR)ratio were increased significantly only for HIIT group.Blood level of tocopherol and ascorbic acid was significantly increased(values were within the normal range)in all the respective vitamin supplemented groups.Supplementation of vitamin C and E secures health protection with suppressed haemolysis and improved inflammatory blood variables with enhanced explosive leg strength and lipid profile parameters without any concomitant change in endurance capacity.

关键词： Sprint interval training Lipid profile Haematological indices Haemolysis Athletes

Multimodal chemo-/magneto-/phototaxis of 3G CNT-bots to power fuel cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2020年第1期6卷 1149-1160页

作者： Shirsendu Mitra Nirmal Roy Surjendu Maity Dipa.kA. Bandyopadhyay Department of Chemical Engineering Indian Institute of Technology GuwahatiGuwahatiAssam 781039India Centre for Nanotechnology Indian Institute of Technology GuwahatiGuwahatiAssam 781039India

We report the development of a 3G microswimmer,namely,CNT-bot,capable of undergoing acid-,alkali-,magneto-and phototaxis inside acidic or alkaline baths of peroxide fuel and/or water.The use of carboxyl-functionalised multi-walled carbon nanotubes(MWCNTs)facilitated the propulsion of CNT-bots in an alkaline-water solution by ejecting carbon-dioxide bubbles.Furthermore,doping of magnetite nanoparticles(FeONPs),ferrous ions(Fe^(2+))and titanium dioxide nanoparticles(TiONPs)induces magnetic,chemical and photonic modes of propulsion.While FeONPs stimulated magnetotaxis at a rate of up to~10 body lengths per second under the influence of a bar magnet,chemotaxis of a similar speed in a peroxide fuel was achieved by bubble-propulsion of oxygen gas originating from the Fenton reaction.In addition,the light-stimulated photo-Fenton reaction led to phototaxis of CNT-bots.A thin coating of magnesium imparted a half-faced Janus appearance to the CNT-bots,which facilitated motion in normal or acidic water media through the ejection of hydrogen gas bubbles.This chemotaxis could be transformed into pH-stimulated directional motion by establishing an acid or alkali concentration gradient across the peroxide and/or water baths.The capacity of CNT-bots to produce oxygen(hydrogen)bubbles in peroxide(acidic water)fuel was exploited to power a PEM fuel cell to generate electricity.The pure oxygen and hydrogen gases generated by CNT-bots in separate chambers were fed directly into the fuel cell in which the incessant motions of the particle facilitated the creation and release of the pure gases to achieve on-demand electricity generation.The motor could also induce dye degradation through advanced oxidation owing to the production of intermediate hydroxyl radicals during the Fenton reaction.

关键词： alkali dioxide gases

NKT cell subsets as key participants in liver physiology and pathology

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2016年第3期13卷 337-346页

作者： Keya bandyopadhyay Idania Marrero Vipin Kumar Department of Medicine University of California San Diego La Jolla CA 92037 USA

Natural killer T （NKT） cells are innate-like lymphocytes that generally recognize lipid antigens and are enriched in microvascular compartments of the liver. NKT cells can be activated by self- or microbial-lipid antigens and by signaling through toll-like receptors. Following activation, NKT cells rapidly secrete pro-inflammatory or anti- inflammatory cytokines and chemokines, and thereby determine the milieu for subsequent immunity or tolerance. It is becoming clear that two different subsets of NKT cells-type I and type II--have different modes of antigen recognition and have opposing roles in inflammatory liver diseases. Here we focus mainly on the roles of both NKT cell subsets in the maintenance of immune tolerance and inflammatory diseases in liver. Furthermore, how the differential activation of type I and type II NKT cells influences other innate cells and adaptive immune cells to result in important consequences for tissue integrity is discussed. It is crucial that better reagents, including CDld tetramers, be used in clinical studies to define the roles of NKT cells in liver diseases in patients.

关键词： CDld lipids liver disease NKT cells

An Autopsy and Histopathology-based Study to Ascertain the Cause of Death of Brought Dead Cases

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 Forensic Science and Medicine 2024年第1期10卷 28-33页

作者： Chandan bandyopadhyay Prabir Chandra Paul Prabhas Chandra Chakraborty Department of Forensic and State Medicine Medical CollegeKolkataWest BengalIndia Department of Pathology Jagannath Gupta Institute of Medical Science and HospitalKolkataWest BengalIndia Department of Forensic Medicine and Toxicology NRS Medical College and HospitalKolkataand M.G.M Medical College and L S.K HospitalKishanganjBiharIndia

Background and Objectives:The cases of apparent natural deaths are encountered in the hospital casualties who are noted dead at the time of the first medical attention and as such are labeled as“Brought Dead.”These include the cases of sudden death,unexplained death,and unattended death.The cause of such deaths is reported in the literature to emanate principally from the cardiovascular system,though there are some documented geographical,racial,and other variations.In the present study,we endeavored to detect the cause of such natural deaths in terms of the disease and the organ system involved,in the deceased individuals of the contemporary Bengali population,with cases due to obvious unnatural causes being excluded.Materials and Methods:An observational,cross-sectional study with 105(n=105,male:89,female:16)study subjects of age group of 20-80 years,selected by systemic random sampling,from the brought dead subjects coming to the mortuary of the NRS Medical College and Hospital for medicolegal autopsy from April 2011 to March 2012,excluding cases having a history of the obvious unnatural event.Organ system-wise gross examination was done,followed by tissue sampling for histopathological examination.The case-wise findings were tabulated and analyzed for descriptive statistics using SPSS software.Results:In the present study,89 cases were male(84.8%)and 16 cases were female(15.2%),which reflects a male:female ratio of 5.56:1.The dead bodies are mostly recovered from the footpaths(47 cases,44%).Sixty-four(61%)cases are of known identity.In 54 cases out of 105(51.4%),morbid pathology is detected in the respiratory system(RS),lobar pneumonia,and cavitary pulmonary tuberculosis being the most frequent disease entity,in both genders.Fifty-one years-sixty-five years is found to be the most commonly affected age group,in both genders.Interpretation and Conclusions:The present study shows that the most common organ system involved in brought dead cases is the RS,which is supported by a few Indian studies.

关键词： Autopsy brought dead cause of death histopathology

Exacerbated VEGF up-regulation accompanies diabetes-aggravated hemorrhage in mice after experimental cerebral ischemia and delayed reperfusion

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2022年第7期17卷 1566-1575页

作者： Angela ka Wai Lai Tsz Chung Ng Victor ka Lok Hung ka Cheung Tam Chi Wai Cheung Sookja Kim Chung Amy Cheuk Yin Lo Department of Ophthalmology Li Ka Shing Faculty of MedicineThe University of Hong KongHong Kong Special Administration RegionChina Department of Anesthesiology Laboratory and Clinical Research Institute for PainThe University of Hong KongHong Kong Special Administration RegionChina Macao University of Science and Technology TaipaMacao Special Administration RegionChinaSchool of Biomedical SciencesThe State Key Laboratory of Pharmaceutical BiotechnologyThe University of Hong KongHong Kong Special Administration RegionChina

Reperfusion therapy is the preferred treatment for ischemic stroke,but is hindered by its short treatment window,especially in patients with diabetes whose reperfusion after prolonged ischemia is often accompanied by exacerbated hemorrhage.The mechanisms underlying exacerbated hemorrhage are not fully understood.This study aimed to identify this mechanism by inducing prolonged 2-hour transient intraluminal middle cerebral artery occlusion in diabetic Ins2Akita/+mice to mimic patients with diabetes undergoing delayed mechanical thrombectomy.The results showed that at as early as 2 hours after reperfusion,Ins2Akita/+mice exhibited rapid development of neurological deficits,increased infarct and hemorrhagic transformation,together with exacerbated down-regulation of tight-junction protein ZO-1 and upregulation of blood-brain barrier-disrupting matrix metallopeptidase 2 and matrix metallopeptidase 9 when compared with normoglycemic Ins2+/+mice.This indicated that diabetes led to the rapid compromise of vessel integrity immediately after reperfusion,and consequently earlier death and further aggravation of hemorrhagic transformation 22 hours after reperfusion.This observation was associated with earlier and stronger up-regulation of pro-angiogenic vascular endothelial growth factor(VEGF)and its downstream phospho-Erk1/2 at 2 hours after reperfusion,which was suggestive of premature angiogenesis induced by early VEGF up-regulation,resulting in rapid vessel disintegration in diabetic stroke.Endoplasmic reticulum stress-related pro-apoptotic C/EBP homologous protein was overexpressed in challenged Ins2Akita/+mice,which suggests that the exacerbated VEGF up-regulation may be caused by overwhelming endoplasmic reticulum stress under diabetic conditions.In conclusion,the results mimicked complications in patients with diabetes undergoing delayed mechanical thrombectomy,and diabetes-induced accelerated VEGF up-regulation is likely to underlie exacerbated hemorrhagic transformation.Thus,suppression of the VEGF pathway could b

关键词： blood-brain barrier brain injury diabetes mellitus hemorrhagic transformation infarct ischemia/reperfusion injury middle cerebral artery occlusion mouse model stroke vascular endothelial growth factor

High-resolution multi-scale air pollution system:Evaluation of modelling performance and emission control strategies

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第3期137卷 65-81页

作者： Diogo Lopes Joana Ferreira Sandra Rafael ka In Hoi Xin Li Yuan Liu ka-Veng Yuen kai Meng Mok Ana Isabel Miranda Department of Environment and Planning&CESAM University of AveiroAveiroPortugal Department of Civil&Environmental Engineering Faculty of Science and TechnologyUniversity of MacaoMacao SARChina

A high percentage of the world's population lives in areas where air pollutant concentrations exceed the World Health Organization guidelines.This work aims to develop and test,a high-resolution multi-scale air pollution modelling system by integrating a set of adequate tools.This system is able to provide detailed air pollutant concentrations in urban areas and support air quality management strategies through a better identification of different atmospheric processes.It also allows furthering the design and assessment of air pollution control measures for a specific area.To evaluate its performance and suitability,the system was applied to the Macao Special Administrative Region(SAR),China,one of the most densely populated areas on earth,during a winter period when this area is affected by high levels of Particulate Matter(PM).Although the developed system tends to underestimate the PM concentrations,it revealed a good performance in reproducing the temporal and spatial air pollution patterns.Several exceedances of the Chinese air quality standards were calculated and high population exposure to PM pollution was estimated.The tested urban atmospheric emission reduction scenarios have shown air quality improvements,indicating that emission reduction measures at urban level should focus on the domestic sector.However,it is crucial to implement joint pollution prevention strategies with neighbouring regions to improve the air quality in Macao SAR.The approach developed in this work can support policymakers in defining new strategies to reduce atmospheric pollution in urban areas.

关键词： Urban areas High-resolution emission inventory Particulate matter Population exposure