检索结果-南通市图书馆

nuclear Level Density and Thermodynamic Functions for nuclei with Static Deformation

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2002年第4期37卷 457-460页

作者： A.n.Behkami M.n.nasrabadi PhysicsDepartment ShirazUniversityShiraz71454Iran

The level densities of even-odd and even-even isotopes 161,162Dy,166 Er and 171,172yb were calculated using microscopic theory of interacting fermions and compared with *** is found that the data can be well reproduced with level density formalism for nuclei with static *** nuclear temperature as well as the entropy of nuclear system as a function of excitation energy has been extracted from the BCS *** is shown that the entropy exhibits an S-formed shape as a function of excitation *** is interpreted as a phase *** of treating the even-odd and even-even nuclear systems has been presented and discussed.

关键词：核物理原子核能级密度热力学函数

Detection of Low Sugar Concentration Solution Using Frequency Selective Surface (FSS)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第5期71卷 2869-2882页

作者： n.S.Ishak F.C.Seman n.Zainal n.A.Awang Faculty of Electrical and Electronics Engineering Universiti Tun Hussein Onn MalaysiaParit RajaBatu Pahat86400Malaysia Research Center for Applied Electromagnetics(EMcenter) The Institute of Integrated EngineeringUniversiti Tun Hussein Onn MalaysiaParit RajaBatu Pahat86400Malaysia Microelectronic and nanotechnology-Shamsuddin Research Centre(MinT-SRC) The Institute of Integrated EngineeringUniversiti Tun Hussein OnnParit RajaBatu Pahat86400Malaysia Photonics Devices and Sensor Research(PDSR) Faculty of Applied Science and Technology(FAST)Universiti Tun Hussein Onn Malaysia(Pagoh Campus)JorakBukit Pasir84500Malaysia

Sugar is important in daily food intake since it is used as food preservative and ***,is important to analyze the influence of sugar on the spectroscopic properties of the *** spectroscopy is proven to be useful and an efficient method for sugar detection as well as for future food quality ***,the lack of detection sensitivity in Terahertz Spectroscopy has prevented it from being used in a widespread spectroscopic analysis *** this paper,Frequency Selective Surface(FSS)using the Terahertz Spectroscopy Time Domain Spectrum(THz-TDS)which operates at terahertz frequency range has been demonstrated for application of sugar *** FSS is designed with a circle slot structure and has been optimized in line with the molecular resonance of glucose and fructose at different level concentration at 1.98 THz and 1.80 THz,*** magnitude of glucose and sucrose is inversely proportional with the level of sugar *** realization of the FSS structure is using electron beam lithography and wet etching *** show that the FSS performance for glucose and sucrose reveal fair shifts in measured transmission magnitude from its original in CST by approximately 30%.The use of fabricated FSS with circle structure indicates that the concentration can be improved averagely at 25%for glucose and 13%for ***,it shows that the FSS circle structure combined with THz-TDS has the potential to become an alternative method for food sensing technology in the future.

关键词： THz sensing FSS circle structure sugar concentration

Petrography and tectonic provenance of the Permian Tunas Formation:Implications on the paleotectonic setting during the ClaromecóForeland Basin evolution,southwestern Gondwana margin,Argentina

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 Palaeogeography 2022年第3期11卷 427-447页

作者： María Belén Febbo Renata n.Tomezzoli nora n.Cesaretti Giselle Choque natalia B.Fortunatti Guadalupe Arzadún Consejo nacional de Investigaciones Científicas y Técnicas(COnICET) Argentina Dpto.de Geología Universidad Nacional del SurAvenida Alem 1253B8000ICPBahía BlancaArgentina Centro de Geología Aplicada y Medio Ambiente(CGAMA CIC–UNS)Dpto.de GeologíaUniversidad Nacional del SurBahía BlancaArgentina Laboratorio de Paleomagnetismo“Daniel A.Valencio” Instituto de Geociencias BásicasAplicadas y Ambientales de Buenos Aires(IGEBA)Departamento de Ciencias GeológicasFacultad de Ciencias Exactas y Naturales(FCEyN)Universidad de Buenos Aires(UBA)Pabellón II(1428)CABAArgentina Laboratorio de Termocronología(La.Te Andes–COnICET) Las Moreras 310A4401XBAVaquerosSaltaArgentina

The Claromec o Basin is located at the south-western sector of the Buenos Aires province,*** basin is considered a foreland basin closely related to the evolution of the southwestern Gondwana *** contribution focuses on the provenance analysis of the Tunas Formation(Permian,Pillahuinc o Group),which represents the last filling stage for the Claromec o Foreland *** and tectonic provenance analyses were performed in sandstones recovered from subsurface(PAnG 0001 and PAnG0003 exploration wells)and outcrops located close to the basin center(Gonzales Chaves locality).In the subsurface,the analyzed succession is composed of medium-to fine-grained sandstones interbedded with tuffs,mudrocks,carbonaceous mudrocks and coal *** outcrops,the succession is dominated by mediumto fine-grained sandstones interbedded with *** composition patterns are distributed into the recycled orogen and transitionally recycled to mixed *** analyses,in addition to provenance and sedimentological studies,confirm that sedimentary material was derived from a mixed source,which largely comes from the Sierras Australes fold and thrust belt,located towards the W-SW,where the sedimentary succession is interbedded with volcanic *** Tunas Formation shows clear differences in its modal composition,paleocurrent direction and paleoenvironmental conditions with respect to the underlying units of the Pillahuinc o Group(Sauce Grande,Piedra Azul and Bonete formations).Source areas changed from cratonic to mixed fold belt/arc-derived material,suggesting variations in the Claromec o Basin configuration during the Late *** in the paleotectonic scenario during the deposition of the Tunas Formation have been interpreted as a consequence of a compressive post-collisional deformation event,the product of adjustment,accommodation and translation of terrains towards the equator during the Permian-Triassic to form Pangea.

关键词： Provenance area Petrography Tunas Formation ClaromecóForeland Basin Southwestern Gondwana margin Permian Upper Paleozoic

Decay rates and electromagnetic transitions of heavy quarkonia

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics C 2015年第12期39卷 19-24页

作者： J.n.Pandya n.R.Soni n.Devlani A.K.Rai Applied Physics Department Faculty of Technology & Engineeringthe M S University of Baroda Applied Physics Department Polytechnicthe M S University of Baroda Department of Applied Physics Sardar Vallabhbhai National Institute of Technology

The electromagnetic radiative transition widths for heavy quarkonia, as well as digamma and digluon decay widths, are computed in the framework of the extended harmonic confinement model （ERHM） and Coulomb plus power potential （CPP,） with varying potential index v. The outcome is compared with the values obtained from other theoretical models and experimental results. While the mass spectra, digamma and digluon widths from ERHM as well as CPP v=1 are in good agreement with experimental data, the electromagnetic transition widths span over a wide range for the potential models considered here making it difficult to prefer a particular model over the others because of the lack of experimental data for most transition widths.

关键词： heavy quarkonia radiative decays electromagnetic transitions

Seamount chains and hotspot tracks:Superficially similar,deeply different

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2023年第6期14卷 307-326页

作者： Edgardo Cañón-Tapia División de Ciencias de la Tierra CICESE.Carretera Ensenada-Tijuana#3985Ensenada Baja CaliforniaCP 22860Mexico

nearly 80%of the seafloor extension has not been covered by high-resolution bathymetry,impeding direct observation of ***,lists of seamount location and height at a global scale have been produced using different *** this work four of such databases(publicly available)are compared with each other to assess their *** identify large differences among databases that could have exerted strong influences on models of seamount production and associated geodynamic *** those differences,it is shown that all databases allow the identification of seamount lines both along the present-day Mid Ocean Ridge(MOR)system and on intraplate ***,those seamount lines do not coincide with the so-called hotspot tracks that commonly were defined by selectively focusing attention on the larger *** of all the databases also shows that distinction based only on seamount size between seamounts produced at Mid-Ocean Ridge(MOR)environments from those associated with mantle-plum fed-hotspot activity has been ***,combined with the fact that most seamount lines defined by the available databases can be traced back to past locations of MOR indicates that most of the present-day intraplate linear arrays of seamounts,which include some large seamounts,were not produced by the action of underlying mantle anomalies envisaged in the form of mantle *** evidence presented here calls for a reassessment of the form in which volcanic and tectonic activities are conceptually related to each other.

关键词： Seamount origin Chains of seamounts Spatial distribution of volcanism Intraplate volcanism Mid Ocean Ridge volcanism

Marinoan glaciation in the Indian subcontinent——Anatomy and global implications

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 Palaeogeography 2024年第2期13卷 293-308页

作者： H.n.Bhattacharya Department of Earth Sciences Techno India UniversityWest BengalSector VSalt LakeKolkata700091India

Detailed sedimentological analysis of the Pokaran Boulder Bed,representing the most basal unit of the neoproterozoic-Lower Cambrian Marwar Supergroup,clearly indicates its glacial *** glacial sediments are interpreted as an ice-contact submarine fan *** on the detrital and inherited zircon population of the Marwar Supergroup sediments and interlayered pyroclastic deposits,a Marinoan cryochron of the Cryogenian Period is envisaged for the Pokaran Boulder *** well-preserved Ediacaran elements in the post-glacial sedimentary succession also support a Cryogenian to Early Cambrian age of the Marwar *** glacial deposition at the base of the Marwar Supergroup strengthens the regional correlation between the studied sediments with the Lesser Himalayan Blaini-Krol-Tal sediments and the Haqf Supergroup of *** available zircon ages and paleomagnetic data of the Malani Igneous suite,along with the Marinoan glacial deposits,detrital zircon ages,and Ediacaran fossil elements of the Marwar Supergroup add significant information to the neoproterozoic Earth history.

关键词： neoproterozoic Marinoan glaciation Diamictites Pokaran Boulder Bed Marwar Supergroup

Morpholino studies shed light on the signaling pathways regulating axon regeneration in lampreys

在线全文

学校读者我要写书评

暂无评论

neural Regeneration Research 2022年第7期17卷 1475-1477页

作者： Daniel Sobrido-Cameán Antón Barreiro-Iglesias Department of Functional Biology Faculty of BiologyCIBUSUniversidade de Santiago de CompostelaSantiago de CompostelaA CoruñaSpain Department of Zoology University of CambridgeCambridgeUK

Lampreys are one of the most ancient extant vertebrates and they have become an animal model of interest for the study of spontaneous axon regeneration after a traumatic central nervous system *** to most mammals,lamp... 详细信息

关键词： traumatic regeneration injury

Strong gravitational lensing of blazar gamma-radiation and intergalactic magnetic fields

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2024年第1期48卷 184-191页

作者： Yu.n.Eroshenko Institute for nuclear Research of the Russian Academy of Sciences 60th October Anniversary Prospect 7a 117312 MoscowRussi

The influence of intergalactic magnetic fields on the strong gravitational lensing of blazar secondary gamma radiation is ***,two cases of strong gravitational lensing of blazar gamma-radiation are known,where radiation is deflected by galaxies on the line of sight between the blazars and *** magnetic field can affect the movements of electron-positron pairs generated by primary radiation,thereby changing the directions of secondary gamma *** modifies the equation of the gravitational lens and leads to the dependence of the observed signal in the secondary gamma radiation on the energy of photons and magnetic ***,it is possible,in principle,to estimate the intergalactic magnetic fields from the time delay of signals,from the angular position of images(for future high-resolution gamma-ray telescopes)or from the shape of the observed energy *** method is demonstrated by the example of the blazar B0218+*** this case,however,it is not possible to obtain useful constraints due to the large distances to the blazar and lens *** result is only a lower limit on the magnetic field B>2×10^(−17)G,which is weaker than other existing ***,future discoveries of lensed blazars may provide more favorable opportunities for measuring the magnetic fields,especially with the help of a new generation of gamma-ray telescopes such as e-ASTROGAM,GECAM,and SVOM as well as future gamma-ray telescopes with a high angular resolution,∼0.1″.

关键词： gravitational lensing blazar gamma-astronomy intergalactic magnetic fields

Structural Stability of the Financial Market Model: Continuity of Superhedging Price and Model Approximation

在线全文

学校读者我要写书评

暂无评论

Journal of the Operations Research Society of China 2024年第1期12卷 215-241页

作者： Sergey n.Smirnov Faculty of Computational Mathematics and Cybernetics Lomonosov Moscow State UniversityMoscow119991Russian Federation

The present paper continues the topic of our recent paper in the same journal,aiming to show the role of structural stability in financial *** the context of financial market modeling,structural stability means that a specific“no-arbitrage”property is unaffected by small(with respect to the Pompeiu–Hausdorff metric)perturbations of the model’s *** formulate,based on our economic interpretation,a new requirement concerning“no arbitrage”properties,which we call the“uncertainty principle”.This principle in the case of no-trading constraints is equivalent to structural *** demonstrate that structural stability is essential for a correct model approximation(which is used in our numerical method for superhedging price computation).We also show that structural stability is important for the continuity of superhedging prices and discuss the sufficient conditions for this continuity.

关键词： Uncertainty Structural stability no arbitrage Continuity of superhedging price Compact-valued multifunction Financial market model approximation Trading constraints