检索结果-南通市图书馆

Comparative Effect of an Addition of a Surface Term to Woods-Saxon Potential on Thermodynamics of a Nucleon

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2018年第1期69卷 23-27页

作者： b.C.lütfüoglu Department of Physics Akdeniz University

In this study, we reveal the difference between Woods-Saxon(WS) and Generalized Symmetric WoodsSaxon(GSWS) potentials in order to describe the physical properties of a nucleon, by means of solving Schr¨odinger equation for the two potentials. The additional term squeezes the WS potential well, which leads an upward shift in the spectrum, resulting in a more realistic picture. The resulting GSWS potential does not merely accommodate extra quasi bound states, but also has modified bound state spectrum. As an application, we apply the formalism to a real problem,an α particle confined in bohrium-270 nucleus. The thermodynamic functions Helmholtz energy, entropy, internal energy,specific heat of the system are calculated and compared for both wells. The internal energy and the specific heat capacity increase as a result of upward shift in the spectrum. The shift of the Helmholtz free energy is a direct consequence of the shift of the spectrum. The entropy decreases because of a decrement in the number of available states.

关键词： Woods-Saxon potential generalized symmetric Woods-Saxon potential bound states analytical solutions partition function thermodynamic functions

ON THE lIMITAb.lITY OF SOlUTIONS OF SOME DIFFERENCE EQUATIONS

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 1997年第1期17卷 64-68页

作者： l.Rempulska b.Szmanda Poznan University of Technology 60-965 Pozń Poland

We investigate limitab.lity by the Cesaio (C, 1) and the Ab.l (A) methods of solutions of some third and fourth order difference equations. Also some results contained in [2],[3] are improved.

关键词： difference equation (C 1)-limitab.lity (A)-limitab.lity

Calculation of Radii and Density of ^(7-19)b Isotopes Using Effective Skyrme Force

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第3期49卷 696-702页

作者： E.Tel S.Okuducu G.Tatar N.N.Akti M.H.b.lükdemir Gazi University Faculty of Arts and SciencesAnkaraTurkey

Abstract In this study, the proton and neutron densities, charge densities, rms nuclear charge radii, rms nuclear mass radii, rms nuclear proton, neutron radii, and neutron skin thickness are calculated by using Harfree-Fock method with an effective nucleon-nucleon Skyrme interactions with SⅠ, SⅡ, SⅣ, T3, SKM, and SKM^＊ parameters. These nuclear properties for the neutron-rich isotopes of b （boron） are presented. The calculated results are compared with the experimental and theoretical results of other researchers.

关键词： ^7-9b isotopes halo nuclei Skyrme force Hartree-Fock calculations

Vitamin D in prostate cancer

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2018年第3期20卷 244-252页

作者： Donald l Trump Jeanny b Aragon-Ching Inova Schar Cancer Institute Inova Health System Fairfax VA 22037 USA.

Signaling through the vitamin D receptor has been shown to be biologically active and important in a number of preclinical studies in prostate and other cancers. Epidemiologic data also indicate that vitamin D signaling may be important in the cause and prognosis of prostate and other cancers. These data indicate that perturbation of vitamin D signaling may be a target for the prevention and treatment of prostate cancer. large studies of vitamin D supplementation will be required to determine whether these observations can be translated into prevention strategies. This paper reviews the available data in the use of vitamin D compounds in the treatment of prostate cancer. Clinical data are limited which support the use of vitamin D compounds in the management of men with prostate cancer. However, clinical trials guided by existing preclinical data are limited.

关键词： androgens CYP24A1 inflammation prostate cancer vitamin D analogs

On the Role of Differentiation Parameter in a bound State Solution of the Klein-Gordon Equation

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 2019年第3期71卷 267-273页

作者： b.C.lütfüo?lu Department of Physics Faculty of Science Akdeniz University Department of Physics Faculty of Science University of Hradec Králové

Recently, the bound state solutions of a confined Klein-Gordon particle under the mixed scalar-vector generalized symmetric Woods-Saxon potential in one spatial dimension have been investigated. The obtained results reveal that in the spin symmetric limit discrete spectrum exists, while in the pseudo-spin symmetric limit it does *** this manuscript, new insights and information are given by employing an analogy of the variational principle. The role of the difference of the magnitudes of the vector and scalar potential energies, namely the differentiation parameter,on the energy spectrum is examined. It is observed that the differentiation parameter determines the measure of the energy spectrum density by modifying the confined particle's mass-energy in addition to narrowing the spectrum interval length.

关键词： Klein-Gordon equation generalized symmetric Woods-Saxon potential bound st ate spectrum spin symmetry limit analytic solutions

Metab.lomic fingerprinting of pig seminal plasma identifies in vivo fertility biomarkers

在线全文

学校读者我要写书评

暂无评论

Journal of Animal Science and biotechnology 2022年第2期13卷 473-487页

作者： Yentel Mateo-Otero Pol Fernández-lópez Ariadna Delgado-bermúdez Pau Nolis Jordi Roca Jordi Miró Isab.l barranco Marc Yeste biotechnology of Animal and Human Reproduction(TechnoSperm) Institute of Food and Agricultural TechnologyUniversity of GironaES-17003 GironaSpain Department of biology Unit of Cell BiologyFaculty of SciencesUniversity of GironaES-17003 GironaSpain Centre d’Estudis Avançats de blanes(CEAb) Spanish Research Council(CSIC)ES-17300 GironaSpain Magnetic Nuclear Resonance Facility Autonomous University of BarcelonaBellaterraES-08193 Cerdanyola del VallèsSpain Department of Animal Medicine and Surgery Faculty of Veterinary MedicineUniversity of MurciaES-30100 MurciaSpain Equine Reproduction Service Department of Animal Medicine and SurgeryFaculty of Veterinary MedicineAutonomous University of BarcelonaBellaterraES-08193 Cerdanyola del VallèsSpain Department of Veterinary Medical Sciences University of BolognaIT-40064 Ozzano dell’EmiliaBolognaItaly

background:Metab.lomic approaches,which include the study of low molecular weight molecules,are an emerging-omics technology useful for identification of *** this field,nuclear magnetic resonance(NMR)spectroscopy has already been used to uncover(in)fertility biomarkers in the seminal plasma(SP)of several mammalian ***,NMR studies profiling the porcine SP metab.lome to uncover in vivo fertility biomarkers are yet to be carried ***,this study aimed to evaluate the putative relationship between SPmetab.lites and in vivo fertility *** this end,24 entire ejaculates(three ejaculates per boar)were collected from artificial insemination(AI)-boars throughout a year(one ejaculate every 4 months).Immediately after collection,ejaculates were centrifuged to obtain SP-samples,which were stored for subsequent metab.lomic analysis by NMR *** outcomes from 1525 inseminations were recorded over a year,including farrowing rate,litter size,stillbirths per litter and the duration of ***:A total of 24 metab.lites were identified and quantified in all *** operating characteristic(ROC)curve analysis showed that lactate levels in SP had discriminative capacity for farrowing rate(area under the curve[AUC]=0.764)while carnitine(AUC=0.847),hypotaurine(AUC=0.819),sn-glycero-3-phosphocholine(AUC=0.833),glutamate(AUC=0.799)and glucose(AUC=0.750)showed it for litter ***,citrate(AUC=0.743),creatine(AUC=0.812),phenylalanine(AUC=0.750),tyrosine(AUC=0.753)and malonate(AUC=0.868)levels had discriminative capacity for stillbirths per litter;and malonate(AUC=0.767)and fumarate(AUC=0.868)levels for gestation ***:The assessment of selected SP-metab.lites in ejaculates through NMR spectroscopy could be considered as a promising non-invasive tool to predict in vivo fertility outcomes in ***,supplementing AI-doses with specific metab.lites should also be envisaged as a way to improve their f

关键词： Artificial insemination in vivo fertility Metab.lomics NMR Pregnancy outcomes Seminal plasma

Approach for electrodynamic force for compensation in low voltage circuit breaker WP 630-1.2 type

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第3期8卷 393-396页

作者： lU Na XU l.J Miedzifiski b Automation School Beijing University of Posts and Telecommunications Beijing 100876 China Electrical Power Engineering Institute Wroclaw University of Technology Wroclaw Poland

Undesirable repulsive force between contact members due to both a current path shrink near a real contact area and/or so-called pinch effect is particularly onerous for power switch applications, and results in either contact floating or bouncing which are associated with an electric arc following contact welding. This problem is of great importance for any circuit breaker especially for compact low voltage vacuum circuit breakers. To avoid contact floating at closure and during any inrush current under short circuit conditions, the electrodynamic repulsive force can be employed successfully if we use a special compensation system flexibly combined with the contact itself. However to select and design the compensation system properly, its efficiency has to be known. This paper presents an approach to obtain the electrodynamic force value depending on different shaped (rectangular, square, circle and arch) copper plates used in the compensator by using ANSYS for current values 40 kA RMS. Curve-fitting was done according to the calculating results, the optimization designing of compensation unit is based on them.

关键词： Compensation. Electrodynamic force. FEM (Finite Element Method)

Unsuitable use of spin and pseudospin symmetries with a pseudoscalar Cornell potential

在线全文

学校读者我要写书评

暂无评论

Chinese Physics b 2014年第9期23卷 60-61页

作者： l.b.Castro A.S.de Castro Departamento de Física CFM Universidade Federal de Santa Catarina Departamento de Física Universidade Federal do Maranho Campus Universtitrio do Bacanga Departamento de Física e Química Campus de Guaratinguet Universidade Estadual Paulista

The concepts of spin and pseudospin symmetries has been used as mere rhetorics to decorate the pseudoscalar potential [Chin. Phys. b 22 090301 （2013）]. It is also pointed out that a more complete analysis of the bou... 详细信息

关键词： Dirac equation pseudoscalar Comell potential spin symmetry pseudospin symmetry

lu–Hf constraints on pre-,syn,and post-collision associations of the Gurupi b.lt,brazil:Insights on the Rhyacian crustal evolution

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2022年第5期13卷 336-349页

作者： Evandro l.Klein Joseneusa b.Rodrigues Geological Survey of brazil SBNQuadra 02Bloco HEd.Central Brasília1andarAsa NorteBrasília-DF CEP:70040-904Brazil GPGE–Grupo de Pesquisa em Geologia Econômica(Economic Geology Research Group) PPGG–Programa de Pós-Graduação em Geologia e GeoquímicaUniversidade Federal do ParáBelém-PABrazil

The Gurupi b.lt(together with the São luís cratonic fragment),in north-northeastern brazil,has been described in previous studies that used extensive field geology,structural analysis,airborne geophysics,zircon U–Pb dating,and whole-rock Sm–Nd isotope and geochemical data as a polyphase orogenic b.lt,with the Rhyacian being the main period of crust *** was related to a 2240 Ma to 2140 Ma accretionary processes that produced juvenile crust,which has subsequently been reworked during a collisional event at 2100±20 Ma,with little evidence of Archean *** this study,we use lu–Hf isotopic data in zircon from granitoids(including gneiss)of variable magmatic series,and amphib.lite to improve the knowledge of this scenario,and investigate additional evidence of recycling of Archean ***-collisional high ba-Sr and ferroan granitoids and amphib.lite formed in island arc(2180–2145 Ma),show only zircons with suprachondriticεHf values(ca.+1 to+8)indicating the large predominance of juvenile *** 10%of the data show slightly negativeεHf values(0 to-4),which have been observed in granodiorite-gneiss formed in continental arc(2170–2140 Ma),and in strongly peraluminous collisional granites(2125–2070 Ma),indicating the rework of older Paleoproterozoic to Archean components(Hf_(TDM)=2.11–3.69 Ga).A two-component mixing model using both Hf and published Nd isotope data are in line with this interpretation and indicate more than 90%of juvenile material,and less influence of Archean *** with other Rhyacian terranes that are interpreted to have been close to Gurupi in a pre-Columbia configuration(ca.2.0 Ga),our results differ from those of SEGuiana Shield,which show strong influence of Archean protoliths,and are very similar to those of the central-eastern portion of the baoulé-Mossi Domain of the West African Craton,which has also been formed largely by juvenile magmas in an accretionary-collisional orogen.

关键词： Paleoproterozoic Accretion Collision Isotope geology lu–Hf isotopes Rhyacian