检索结果-南通市图书馆

Calculation of gluon Distribution Functions in Leading Order by regge-like Behavior at Low-x

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2005年第5X期44卷 891-896页

作者： g.r. Boroun Physics Department Razi University Kermanshah 67149 Iran

An approximate analytical form of the gluon distribution function from the derivative F2 proton structure function data at low-x assuming the regge-like behavior of the gluon distribution function at this limit is presented. In this method, we calculate λ and C parameters for each low-x value at several Q^2 values using the scaling violation of the F2 proton structure function. For low-x, A is found to be independent of x within the experimental accuracy. We make use of the leading order Altarelli-Parisi （A-P） evolution equations in our analysis. To test the validity of our new determined gluon distribution functions, we compare them with the QCD parton distribution functions at low-x region.

关键词： regge-like behavior DgLAP equation for gluon low x

A Sultone route to the Antileukemic 1,10-Seco-Eudesmanolides (-)-Eriolanin and (-)-Eriolangin

在线全文

学校读者我要写书评

暂无评论

复旦学报（自然科学版） 2005年第5期44卷 730-731页

作者： J. Merten A. hennig P. Metz Institut für Organische Chemie TU Dresden Bergstr. 66 D-01069 Dresden GermanyInstitut für Organische Chemie TU Dresden Bergstr. 66 D-01069 Dresden GermanyInstitut für Organische Chemie TU Dresden Bergstr. 66 D-01069 Dresden Germany

The highly oxygenated 1,10-seco-eudesmanolides ( - )-eriolanin (1) and ( - )-eriolangin (2) isolated from the plant Eriophyllum lanatum (Asteraceae) inhibit the growth of the human KB tumor cell line in vitro and additionally display a significant antileukemic activity in vivo in mice (Scheme 1)[1]. Using novel methods for the synthetic elaboration of sultones[2], the first enantioselective total syntheses of 1 and 2 have been accomplished, which also established the hitherto unknown absolute configuration of these natural products[3].

关键词：多米骨效应自然产物硫磺杂环磺内脂萜类化合物合成方法

Approach for C_(1)to C_(2)products commencing from carbon dioxide:A brief review

在线全文

学校读者我要写书评

暂无评论

Petroleum 2024年第3期10卷 373-398页

作者： g.r.Dey radiation and Photochemistry Division Bhabha Atomic Research CentreTrombayMumbai 400085India Homi Bhabha National Institute AnushaktinagarMumbai 400094India

The carbon dioxide(CO_(2))conversion to useable compounds remains a great contest to scientists,engineers,and environmentalists with regard to the reverse of the oxidative degradation of *** conversion is essential for the development of complementary fuels and raw materials for various industries,which in turn will help in avoiding the drastic increase in tropospheric temperature due to greenhouse effect leading to global *** solar energy is the earth's essential power source along with the other various forms of energy for example fossil fuels,hydropower,wind,and biomaterials,*** final goal is to establish the artificial photosynthesis,which can be replicated thru various chemical reduction techniques of CO_(2)by employing appropriate photo-,thermal-and electro-catalysts in order to produce different one carbon atom(C_(1))and higher carbon atoms containing ***,the utilization of clean and sustainable CO_(2)towards high-value products is of great interest today due to the recognized environmental worries and subsequent lessening of the fossil fuels utilization load to meet the energy demand of *** way,solar energy can directly and/or indirectly be altered and stored in chemical energy form for industrial as well as societal *** this article our endeavor is to summarize the advances in CO_(2)chemical reduction research area till date especially in free radical-based methods such as electrochemical,photochemical and plasma chemical for the development of carbon species up to two carbon(C_(2))atoms containing products perceived in the chemical reduction of CO_(2).The author hopes that this piece of work will be helpful to researchers and readers who are focused on the field of CO_(2).

关键词： Photocatalysis Electrocatalysis Plasmolysis Thermolysis Carbon dioxide Chemical reduction

Exotic states with QQQ′Q′configuration

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

Communications in Theoretical Physics 2023年第3期75卷 56-61页

作者： Z Asadi g r Boroun Department of Physics Razi UniversityKermanshah 67149Iran

In the framework of a non-relativistic quark model,we have calculated the masses of the QQQ′Q′(Q=c,b,s and Q′=c,b,s)tetraquark *** the linear and quadratic confinement potentials inside a Cornell-type potential along with all possible spin and color configurations,the Schrodinger equation masses of these tetraquark states have been *** on our numerical analysis,linear confinement and quadratic confinement produce acceptable *** that use linear confinement estimate charmonium-like tetraquark mass close to experimental data,as well as bottomonium-like tetraquark mass below the threshold of their meson-meson channels.

关键词： tetraquark quark model non-relativistic charmonium-like bottomonium-like

In Band Full Duplex (IBFD) Technology for Next generation Wireless Networks: A Survey in Cellular Networks

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

China Communications 2023年第5期20卷 20-39页

作者： Injila g.r.Begh Advanced Communication Lab Department of Electronics and Communication EngineeringNIT SrinagarHazratbal190006J&KIndia

Next-generation(Nextg)wireless communication networks with their widespread applications require high data rates,seamless connectivity and high quality of service(QoS).To cope up with an unprecedented rise of data hungry applications,users demand more spectral resources imposing a limitation on available wireless *** of the potential solutions to address the spectrum scarce issue is to incorporate in band full duplex(IBFD)or full duplex(FD)paradigm in next generation networks including 5g new radio(Nr).recently,FD has gained the research interest in cellular networks for its potential to double the wireless link capacity and enhancing spectral efficiency(SE).In half duplex(HD)cellular networks,base stations(BSs)can either perform uplink(UL)or downlink(DL)transmission at a particular time instant leading to reduced throughput *** to the advancement in the self interference reduction(SIr)techniques,full duplex base stations(FD-BSs)can be employed to allow simultaneous UL and DL transmissions at the same time–frequency resources as compared to its HD *** ideally achieves twice the throughput without any additional complexity at user-equipment(UE).This paper covers a detailed survey on FD cellular networks.A series of SIr approaches,UE-UE mitigation techniques are *** existing MAC protocols and antenna architectures for FD cellular networks are *** overview of security aspects for FD in cellular networks is also ***,various open issues and possible research directions are brought up for FD cellular networks.

关键词： cellular network full duplex(FD)communication self interference reduction(SIr) three node full-duplex(TNFD)topology UE-UE interference

Considering the heavy-quark distribution functions at low x

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2023年第10期75卷 71-78页

作者： Elham Karampur g r Boroun Department of Physics Razi UniversityKermanshah 67149Iran

In this paper,we investigate the behavior of charm and bottom distribution functions at low x with respect to the parametrization of the gluon distribution function in the framework of the nonlinear gribov–Levin–ryskin–Mueller–Qiu,Zhu-ruan-Shen(gLr-MQ-ZrS)evolution ***,we solve the gLr-MQ-ZrS equation using the parametrization behavior of the gluon distribution *** computed results are compared with the NNPDF3.0,CT14 and grV92 collaborations.

关键词： nonlinear evolution equation heavy quark density low x

Investigations on pool boiling critical heat flux, transient characteristics and bonding strength of heater wire with aqua based reduced graphene oxide nanofluids

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2018年第3期26卷 445-454页

作者： r. Kamatchi g. Kumaresan School of Mechanical Engineering VIT University Vellore Institute of Technology 632014 Tamil Nadu India Department of Mechanical Engineering Bannari Amman Institute of Technology Sathyamangalam 638401 Tamil Nadu India

In the present work, the pool boiling critical heat flux, transient heat transfer characteristics, and bonding strength of thin Ni-Cr wire with aqua based reduced graphene oxide(r gO) nanofluids are experimentally studied. results indicate:(i) the critical heat flux(CHF) of 0.01, 0.05, 0.1, 0.2, and 0.3 g·L^(-1) concentrations of r gO-water nanofluids varies from 1.42 to 2.40 MW·m^(-2);(ii) the CHF remains same for the tested samples during transient heat transfer studies and(iii) a constant value of CHF upto 10 tests when the nanocoated Ni-Cr wire is tested with DI water and deterioration occurs beyond this which implies a chance of peel off of r gO layer below the critical coating thickness.

关键词： reduced graphene oxide Pool boiling Nanoparticle deposition Transient characteristics

Modeling of unidirectional blood flow in microvessels with effects of shear-induced dispersion and particle migration

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2022年第10期43卷 1585-1600页

作者： g.rOUrE F.r.CUNHA Laboratory of Microhydrodynamics and rheology Department of Mechanical EngineeringUniversity of BrasíliaBrasília70910900Brazil Department of Chemical and Biological Engineering University of Colorado BoulderBoulder803090596USA

A cell-free layer,adjacent to microvessel walls,is present in the blood flow in the microcirculation *** layer is of vital importance for the transport of oxygen-saturated red cells to unsaturated *** this work,we first discuss the physics of formation of this cell-free layer in terms of a balance between the shear-induced dispersion and particle *** this end,we use high-viscosity drops as prototypes for cells,and discuss our results in terms of physical parameters such as the viscosity ratio and the capillary *** also provide a short-time analysis of the transient drift-dispersion equation,which helps us better explain the formation process of the cell-free ***,we present models for investigating the blood flow in two different scales of *** investigating the blood flow in venules and arterioles,we consider a continuous core-flow model,where the core-flow solution is considered to be a Casson fluid,surrounded by a small annular gap of Newtonian plasma,corresponding to the cell-free *** also propose a simple model for smaller vessels,such as capillaries,whose diameters are of a few *** this lower-bound limit,we consider a periodic configuration of aligned,rigid,and axi-symmetric cells,moving in a Newtonian *** this regime,we approximate the fluid flow using the lubrication *** intrinsic viscosity of the blood is theoretically predicted,for both the lower and upper-bound regimes,as a function of the non-dimensional vessel diameter,in good agreement with the previous experimental *** compare our theoretical predictions with the experimental data,and obtain qualitatively good agreement with the well-known Fåhræus-Lindqvist effect.A possible application of this work could be in illness diagnosis by evaluating changes in the intrinsic viscosity due to blood abnormalities.

关键词： theory flow dispersion

Control system design for a pressure-tube-type supercritical water-cooled nuclear reactor via a higher order sliding mode method

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2024年第1期35卷 145-154页

作者： M.Hajipour g.r.Ansarifar Department of Nuclear Engineering Faculty of PhysicsUniversity of IsfahanIsfahan 81746-73441Iran

Nuclear power plants exhibit non-linear and time-variable ***,designing a control system that sets the reactor power and forces it to follow the desired load is complicated.A supercritical water reactor(SCWr)is a fourth-generation conceptual *** an SCWr,the non-linear dynamics of the reactor require a controller capable of control-ling the *** this study,a pressure-tube-type SCWr was controlled during reactor power maneuvering with a higher order sliding mode,and the reactor outgoing steam temperature and pressure were controlled *** an SCWr,the temperature,pressure,and power must be maintained at a setpoint(desired value)during power *** point kinetics equations with three groups of delayed neutrons were used in the ***-order and classic sliding mode controllers were separately manufactured to control the plant and were compared with the PI controllers speci-fied in previous *** controlled parameters were reactor power,steam temperature,and ***,for these parameters,the PI controller had certain instabilities in the presence of *** classic sliding mode controller had a higher accuracy and stability;however its main drawback was the chattering *** was highly accurate and stable and had a small computational *** reality,it followed the desired values without oscillations and chattering.

关键词： Supercritical water nuclear reactor Higher order sliding mode controller Steam temperature Steam pressure Point kinetics model