检索结果-南通市图书馆

On the Nature of Long Period Radio Pulsar GPM J1839-10:Death Line and Pulse Width

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2023年第12期23卷 215-220页

作者： h.Tong School of Physics and Materials Science Guangzhou UniversityGuangzhou 510006China

Recently another long period radio pulsar GPM J1839-10 has been reported,similar to GLEAM-X ***,the energy budget and rotational evolution of long period radio pulsars had been *** time,the death line and pulse width for neutron star and white dwarf pulsars are *** pulse width is included as the second criterion for neutron star and white dwarf *** is found that:(1)PSR J0250+5854 and PSR J0901-4046 *** be normal radio *** have narrow pulse width and they lie near the radio emission death line.(2)The two long period radio pulsars GLEAM-X J162759.5-523504.3 and GPM J1839-10 are unlikely to be normal radio *** possible pulse width is relatively *** lie far below the fiducial death line on the P-P^(·)diagram.(3)GLEAM-X J162759.5-523504.3 and GPM J1839-10 may be magnetars or white dwarf radio *** present,there are many parameters and uncertainties in both of these possibilities.

关键词： stars magnetars-(stars:)pulsars general-(stars:)pulsars individual(GPM J1839−10)

Darboux transformation and exact multisolitons for a matrix coupled dispersionless system

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2020年第7期72卷 1-7页

作者： h Wajahat A Riaz Department of Mathematics China University of Mining and TechnologyBeijing100083China

We present a matrix coupled dispersionless(CD)system.A Lax pair for the matrix CD system is proposed and Darboux transformation is constructed on the solutions of the matrix CD system and the associated Lax *** express an N soliton formula for the solutions of the matrix CD system in terms of *** using properties of the quasideterminants,we obtain some exact solutions,including bright and dark-type solitons,rogue wave and breather solutions of the matrix CD ***,it has been shown that the solutions of the matrix CD system are expressed in terms of solutions to the usual CD system,sine-Gordon equation and Maxwell-Bloch system.

关键词： Matrix coupled dispersionless system Darboux transformation solitons

holographic dark energy in non-conserved gravity theory

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2024年第4期76卷 126-133页

作者： h R Fazlollahi Institute of Gravitation and Cosmology Peoples Friendship University of Russia(RUDN University)6 Miklukho-Maklaya StMoscow117198Russia

Recently, reconsidering the Rastall idea T_(μ;νν)^(v)=α_(,μ) through relativistic thermodynamics gives a new form for the scalar field α which led us to construct modern modified theory of gravity debugged ‘non-conserved gravity theory’ Fazlollahi 2023 Euro. Phys. J. C 83 923. This theory unlike other modified theories of gravity cannot directly explain the current acceleration expansion in the absence of the cosmological constant and or existence of other forms of dark energy. hence, in this study we have reinvestigated holographic dark energy Ρ_(X)~h^(2) in the non-conserved theory of gravity. In this context, the density and pressure of dark energy depend on the non-conserved term and density of the dust matter field. As shown, due to non-conservation effects on large-scale structures, unlike the original holographic model, our model onsets an acceleration epoch for the current Universe satisfies observations. Moreover, the interaction and viscous scenarios are studied for this model.

关键词： non-conserved gravity covariant form of thermodynamics holographic dark energy

Total Pairwise Quantum Correlation and Entanglement in a Mixed-Three-Spin Ising-XY Model with Added Dzyaloshinskii-Moriya Interaction under Decoherence

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2016年第9期33卷 5-9页

作者： h.A.Zad Young Researchers and Elite Club Mashhad BranchIslamic Azad University

We investigate the behavior of geometric global quantum discord （GGQD） and concurrence （C） between half- spins of a mixed-three-spin （1/2, 1, 1/2） system with the Ising-XY model for which spins （1, 1/2） have the Ising interaction and half-spins （1/2, 1/2） have both XY and the Dzyaloshinskii Moriya interactions together, under the decoherence action. A single-ion anisotropy property with coefficient ζ is assumed for the spin-integer. This system which includes an analytical hamiltonian is considered at the front of an external homogeneous magnetic field B in thermal equilibrium. Finally, we compare GGQD and C and express some interesting phase flip reactions of the total quantum correlation and pairwise entanglement between spins （1/2, 1/2）. Generally, we conclude that the concurrence and GGQD have different behaviors under the phase flip channel.

关键词： of is in for Total Pairwise Quantum Correlation and Entanglement in a Mixed-Three-Spin Ising-XY Model with Added Dzyaloshinskii-Moriya Interaction under Decoherence with

Surface modification of ultra-high molecular weight polyethylene for joint prosthesis and sports applications

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2004年第z1期14卷 36-40页

作者： h.Dong Department of Metallurgy and Materials The University of Birmingham Birmingham B15 2TT UK

The recent progresses in the surfaee modification of ultra high molecular weight polyethylene (UhMWPE) using such advanced surface modification technologies as conventional ion implantation (CⅡ), new plasma immersion ion implantation (PⅢ) and novel active screen plasma (ASP), were all reported. Significantly improved wear resistance was achieved, which has great potential for extending the life-span of joint replacement prostheses and enhancing the performance of such sports equipment as skis and snowboards.

关键词： UhMWPE ion implantation PI3 active-screen plasma

Study of Particle Behavior for Steady-State Operation in JT-60U

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

Plasma Science and Technology 2006年第1期8卷 50-54页

作者： h.KUBO Japan Atomic Energy Agency Naka-shiIbaraki-ken311-0193JapantheJT-60Team

This paper summarizes recent studies of particle balance in long pulse discharges, long-term erosion/deposition and hydrogen retention for carbon divertor tiles, and particle behavior in SOL and divertor plasmas related to the two foregoing topics in JT-60U. Global saturation of the particle inventory appeared in the later phase of an ELMy h-mode plasma after several long pulse discharges. As for carbon divertor tiles, erosion was dominant in the outer divertor, and deposition was dominant in the inner divertor. hydrogen isotope concentration （h＋D）/C in the deposition layer was estimated to be -0.032. The SOL plasma flow towards the inner divertor was observed at the low-field-side midplane, and influence of the E, x B drift flow from the outer divertor to the inner divertor via the private region on the divertor particle flux was evaluated to be large in the attached divertor plasmas. The preferential deposition in the inner divertor can be a consequence of these flows. For direct observation of the hydrogen molecular behavior in the divertor plasmas, hydrogen molecular line emission was measured and the fall in the emission intensity with distance from the divertor plates was reproduced by calculation with a neutral transport code and a collisional radiative modeling code.

关键词： tokamak divertor SOL carbon hydrogen

Using Pantheon and hubble parameter data to constrain the Ricci dark energy in a Bianchi Ⅰ Universe

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2022年第6期74卷 103-112页

作者： A Najafi h hossienkhani Department of Physics Technical and Vocational University(TVU)TehranIran Department of Physics Hamedan BranchIslamic Azad UniversityHamedanIran

In this work,we use the most recent publicly available type Ⅰa supernova(SNIa) compilations and h(z) data.A well formulated cosmological model based on Bianchi type Ⅰ(BI) metric is implemented in the presence of the Ricci dark energy *** the maximum likelihood technique,we estimate the present value of hubble's constant h_(0)=70.339±0.743,matter density parameter Ω_(m_(0))=0.297±0.031,anisotropy parameter Ω_(σ_(0))=-0.004 01 ± 0.001 07 within 1σ′ confidence level by bounding our derived model with recent joint Pantheon and h(z)*** have constrained the present value of the equation of state parameter as ω_(de)=-1.17 joint with the observational *** present value of the deceleration parameter of the Universe in the derived model is obtained as q_(0)=-0.749_(-0.086)^(+0.076).Transition redshift is also derived as z_(tr)~0.551 with the recent observations(Pantheon+h(z)) ***,we compare the anisotropy effects on the evolution of h(z) for the proposed model under consideration with different observational datasets.

关键词： Bianchi typeⅠ Pantheon data hubble parameter Ricci dark energy

Molecular Application of a State Specific Multi-Reference Brillouin-Wigner Perturbation Theory

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2016年第2期33卷 22-25页

作者： h.Aksu Department of Physics Bilecik University

The single reference second order Brillouin-Wigner perturbation theory recently developed, which eliminates its size-extensivity error, has been generalized to state-specific, multi-reference （SS-MR）, BWPT2 providing a size-extensive correction to the electron correlation problem for systems that demand the use of a multi-reference function. Illustrative numerical tests of the size-extensivity corrections are made for widely used molecules in their ground states, which are pronounced multi-reference characteristics. We have implemented two-reference and three-reference cases for Ch2, Bh and bond breaking process in the ground states of hF molecules. The results are compared with the rigorously size-extensive methods such as the M^ller-Plesset perturbation theory, i.e., MP2, full configuration interaction （Full-CI） and allied methods using the same basis sets.

关键词： of in Molecular Application of a State Specific Multi-Reference Brillouin-Wigner Perturbation Theory FCI CCSD CISD RhF MRCI CASSCF for been MP is

S-Factor of the ^(3)h(α,γ)^(7)Li Reaction at Astrophysical Energies

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第10期30卷 59-62页

作者： h.Sadeghi Department of Physics Faculty of ScienceArak UniversityArak 8349-8-38156Iran

The astrophysical S-factor forα-^(3)h radiative capture is calculated at astrophysical *** construct conserved two-and three-body electromagnetic currents,using minimal substitution in the explicit momentum dependence of the two-and three-nucleon *** realistic Argonne v_(18) two-nucleon and Urbana IX or Tucson–Melbourne three-nucleon interactions are considered for *** extrapolation of results for the astrophysical S-factor at zero energy,the energy in the order of 1 keV and less is found to be S(0)=0.107(0.112)keV·b,with(without)three-body interactions in satisfactory agreement with other theoretical results and experimental data.

关键词： calculation substitution momentum