检索结果-南通市图书馆

A study on nonlinear steady-state waves at resonance in water of finite depth by the amplitude-based homotopy analysis method

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2020年第5期32卷 888-900页

作者： da-li Xu Zeng liu College of Ocean Science and Engineering Shanghai Maritime UniversityShanghai 201306China School of Naval Architecture and Ocean Engineering Huazhong University of Science and TechnologyWuhan 430074China

Nonlinear steady-state waves are obtained by the amplitude-based homotopy analysis method(AHAM)when resonances among surface gravity waves are considered in water of finite ***,newly proposed in this paper within the context of homotopy analysis method(HAM)and well validated in various ways,is able to deal with nonlinear wave *** waves with small propagation angles,it is confirmed that more components share the wave energy if the wave field has a greater ***,in waves with larger propagation angles,it is newly found that wave energy may also concentrate in some specific *** such wave fields,off-resonance detuning is also *** and symmetrical properties are discovered in some wave *** results may provide a deeper understanding on nonlinear wave interactions at resonance in water of finite depth.

关键词： Nonlinear wave wave resonance steady state homotopy analysis method(HAM)

Nuclear Parton Distribution

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 Letters 1996年第7期13卷 508-511页

作者： XUE da-li li Guang-lie Institute of High Energy Physics Chinese Academy of SciencesBeijing 100039 CCAST(World Laboratory) Beijing 1000803 Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100080

The quark and gluon distributions in nuclei are investigated by a parton model,where the common partons of several nucleons and the non-nucleonic components are *** comparisons of this model with the data for F_(2)^(A... 详细信息

关键词： quark nucleon

Description of Rotation Bands in ^(157,158)Er at Ultrahigh Spin

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 2008年第12期50卷 1391-1395页

作者： ZHANG da-li Department of Physics Huzhou Teacher＇s College Huzhou 313000 China

Properties of the four rotation bands, ^157Er（1,2） and ^15SEr（1,2）, at ultrahigh spin are investigated within the supersymmetry scheme including many-body interactions and possessing the SO（5）（or SU（5）） symmetry on the rotational symmetry. Quantitatively good results of the 7-ray energies and the dynamical moments of inertia in the rotation bands in ^157 Er and ^158 Er at ultrahigh spin are obtained. We theoretically predict that the competition between the anti-pairing and pairing effects may exist in ^157 Er（1,2） and ^158Et（2） bands states. In ^158Er（1） band state, the favourepairing effects may exist and the SO（5）（or SU（5）） symmetry play a dominant role. There may be sphere coexisting with headecupole deformed in ^158Et（1） rotation band state.

关键词： ^157,158Er rotation bands v-ray energies dynamical moments of inertia ultrahigh spin

MATHEMATICAL MODEliNG OF OIL SPILL ON THE SEA AND APPliCATION OF THE MODEliNG IN daYA BAY

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2007年第3期19卷 282-291页

作者： CHEN Hai-zhou li da-ming li Xiao School of Civil Engineering Tianjin University Tianjin 300072

Through the study of the theory of oil spill model, a mathematical modeling of oil spill on the sea is developed which with the consideration of spread, diffusion, drifting and attenuation of oil slick is influenced by evaporation and emulsification factors. A model that under the effect of ocean dynamic condition of tide, wind and wave, using Monte Carlo method to simulate the movement of oil slick is established. The modeling is applied to calculate and predict pollution range of oil spill at oil quay and oil ship in daya Bay. The prediction results have basically shown the pollution situation by emergency of oil spill on the sea.

关键词： oil spill on the sea spread of oil slick diffusion of oil slick Monte Carlo method bay contamination

Recent developments of rare-earth-free hard-magnetic materials

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2016年第1期59卷 16-32页

作者： da li DeSheng Pan ShaoJie li ZhiDong Zhang Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences

Recent advances in rare-earth-free hard-magnetic materials including magnetic bulk, thin films, nanocomposites and nanostructures are introduced. Since the costs of the rare-earth metals boosts up the price of the high-performance rare-earth permanent magnets, there is a much revived interest in various types of hard-magnetic materials based on rare-earth-free compounds. The 3d transition metals and their alloys with large coercivity and high Curie temperatures(working temperatures) are expected to overcome the disadvantages of rare-earth magnets. Making rare-earth-free magnets with a large energy product to meet tomorrow's energy needs is still a challenge.

关键词： rare-earth-free hard-magnetic phases coercivity magnetic anisotropy magnetic proper-ties of nanostructures

Cusp-core problem and strong gravitational lensing

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2009年第11期9卷 1173-1184页

作者： Nan li da-Ming Chen National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China

Cosmological numerical simulations of galaxy formation have led to the cuspy density profile of a pure cold dark matter halo toward the center, which is in sharp contradiction with the observations of the rotation curves of cold dark matter-dominated dwarf and low surface brightness disk galaxies, with the latter tending to favor mass profiles with a flat central core. Many efforts have been devoted to resolving this cusp-core problem in recent years, among them, baryon-cold dark matter interactions are considered to be the main physical mechanisms erasing the cold dark matter （CDM） cusp into a flat core in the centers of all CDM halos. Clearly, baryon-cold dark matter interactions are not customized only for CDM-dominated disk galaxies, but for all types, including giant ellipticals. We first fit the most recent high resolution observations of rotation curves with the Burkert profile, then use the constrained core size-halo mass relation to calculate the lensing frequency, and compare the predicted results with strong lensing observations. Unfortunately, it turns out that the core size constrained from rotation curves of disk galaxies cannot be extrapolated to giant ellipticals. We conclude that, in the standard cosmological paradigm, baryon-cold dark matter interactions are not universal mechanisms for galaxy formation, and therefore, they cannot be true solutions to the cusp-core problem.

关键词： cosmology dark matter -- galaxies formation -- galaxies halos -- galax- ies structure -- gravitational lensing

PQBP1:A New Player in Metabotropic Glutamate Receptor Signaling and Synaptic Plasticity

在线全文

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2021年第11期37卷 1637-1638页

作者： li-da Su Ying Shen Neuroscience Care Unit Second Affiliated Hospital of Zhejiang University School of MedicineHangzhou310009China Department of Physiology Zhejiang University School of MedicineHangzhou310058China

Group 1 metabotropic glutamate receptors(Gp1 mGluRs),comprising mGluR1 and mGluR5,are predominantly located at postsynaptic ***1 mGluRs induce the activation of phospholipase C-γ.

关键词： mGluR5 Metab Receptor

Description of the Triaxial Strongly Deformed Bands in 160,161Tm and 163Tm

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 Letters 2010年第6期27卷 48-51页

作者： ZHANG da-li DING Bin-Gang Department of Physics Huzhou Teacher's College Huzhou 313000

Properties of the triaxial strongly deformed （ TSD） bands of 160,161 Tin and 163Tm are investigated systematically within the supersymmetry scheme including ma^y-body interactions and a perturbation possessing SO（5）（or SU（5）） symmetry on the rotational symmetry. Quantitatively good results of the γ-ray energies, the dynamical moments of inertia and the spin of the TSD bands in 160,161Tm and 163Tm are obtained. The calculation shows that competition between the pairing and anti-pairing effects exist in these TSD bands. Meanwhile, the SU（3） symmetry in TSD bands is broken more seriously than that in superdeformed bands.

关键词： ENERGY bands SUPERSYMMETRY (Physics) COLliSIONS (Nuclear physics) PERTURBATION (Quantum dynamics) QUANTITATIVE research MOMENTS of inertia

Parallel-batch scheduling with deterioration and rejection on a single machine

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2020年第2期35卷 141-156页

作者： li da-wei LU Xi-wen School of Science East China University of Science and TechnologyShanghai 200237China.

The single machine parallel-batch scheduling with deteriorating jobs and rejection is considered in this paper.A job is either rejected,in which a rejection penalty should be paid,or accepted and processed on the *** job’s processing time is an increasing linear function of its starting *** machine can process any number of jobs simultaneously as a *** processing time of a batch is equal to the largest processing time of the jobs in the *** objectives are to minimize the makespan and the total weighted completion time,respectively,under the condition that the total rejection penalty cannot exceed a given upper bound *** show that both problems are NP-complete and present dynamic programming algorithms and fully polynomial time approximation schemes(FPTASs)for the considered problems.

关键词： parallel-batch scheduling rejection deterioration FPTAS NP-complete