Results 1 - 10 of 97
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[en] We present STAR measurements of KS0,ϕ,Λ,Ξ, and Ω at mid-rapidity from Au + Au collisions at √(sNN)=7.7, 11.5, 19.6, 27, and 39 GeV from the Beam Energy Scan (BES) program at the BNL Relativistic Heavy Ion Collider (RHIC). Nuclear modification factors and baryon-to-meson ratios are measured to understand recombination and parton energy loss mechanisms. Implications on partonic versus hadronic dynamics at low beam energies are discussed
[en] This article consider nuclear power plant's current design schedule management mode as the introduction, analysis of current management in-depth, summed up the advantage and disadvantage of the existing management mode. It makes use of mature closed loop cycle project management, and submits progress tracking model assumptions. It also introduces the purpose and background of the progress automation model, the theoretical assumptions of the model, the design criteria and evaluation system of indicators of progress. Based on the achievement process model, this article mainly discusses the specific processes and key points of the project closed loop cycle, and the improvement of the process of project management. (author)
[en] The ideas and flow of plan establishment during the nuclear power station design is discussed in this paper, including the main steps in the plan establishment, and the design schedule and the management of documents and interfaces are improved. An integral design management innovation is proposed for the management of 'schedule, interfaces and drawings and files'. (authors)
[en] The continuous phase transformation from the layered structure to the spinel-like phase seriously degrades the electrochemical properties of Li-rich layered oxides in Lithium-ion batteries. Herein, heterostructured Li-rich cathode materials Li[Li0.2Ni0.17Co0.07Mn0.56]O2 in conjunction with different contents of Zr-containing phosphate (ZCP) coating layers were prepared. The structural and electrochemical characterizations reveal that the ZCP surface layer, which not only prevents electrolyte from eroding the Li-rich core and thus suppressing the fast growth of solid electrolyte interface film and charge transfer resistance on the surface of oxide particles, but also enhances the structural and thermal stabilities of the electrode. As a result, the 3 wt.% coated sample delivers an initial discharge capacity of 216 mAh g−1 with a coulombic efficiency of 80%, compared to 202 mAh g−1 and 71%, respectively, for the bare sample. Particularly, the coated sample demonstrates excellent cycling stability with a capacity retention of 91% within 100 cycles, and higher thermal stability.
[en] Highlights: • The Ni nanowires with different diameters have been fabricated in the AAO templates. • The high-temperature magnetic properties of 1D nanowire arrays are reported. • The templates can suppress growth of nanowires during high-temperature measurements. • The Curie temperature follows a finite-size scaling theory with λ = 0.926 and ξ_0 = 17.35 Å. - Abstract: Ordered Ni nanowire arrays were successfully fabricated by electrochemical deposition method based on the anodized aluminum oxide (AAO) templates. It was found that the diameter of nanowire can be well controlled by the pore size of AAO template. The nanowire arrays with 50 nm in diameter were characterized by X-ray diffraction, electron microscopy, and physical properties measurement system. The results indicate that the polycrystalline Ni nanowire arrays exhibit obvious magnetic anisotropy, and the easy magnetization direction is oriented along the nanowire axial direction. By measuring the temperature dependence of magnetization, the Curie temperatures of nanowires with different sizes were obtained. The Curie temperature of one-dimensionality (1D) nanowire arrays is found to decrease with decreasing diameter and follow a finite-size scaling theory with λ = 0.926 and ξ_0 = 17.35 Å. The fitting exponent of 1D nanowire arrays is close to the nanoparticles (zero-dimensionality, 0D) result and two-dimensionality (2D) nano-films result
[en] We report preliminary results of φ-meson transverse momentum distribution in most central 200 GeV d+Au collisions, measured from STAR Experiment at RHIC. For the transverse momentum between 2.5 and 4 GeV/c at mid-rapidity (|y|<0.5), the nuclear modification factor of φ-meson produced in most central (0-20%) d+Au collisions seems to follow other mesons. Thus, the φ meson nuclear modification factor confirms the trend observed at mid-pT that shows a baryon to meson separation, rather than a hadron mass dependence. The results favor the coalescence as the mechanism for particle production at mid-rapidity and intermediate pT in most central d+Au200 GeV collisions.
[en] Azimuthal anisotropy, especially for the multi-strange hadrons, is expected to be sensitive to the dynamical evolution in the early stage of high energy nuclear collisions. In this paper we present the latest results of multi-strange hadron elliptic flow in Au + Au collisions at √SNN = 200 GeV from the STAR experiment at RHIC. The number-of-quark scaling is evidenced with φ(ss-bar) and Ω(sss) with highly statistical data, which shows strange quark collectivity at RHIC. The ν2 of φ meson is found to be consistent with that of proton within statistical error bars at pT < 1 GeV/c. (the 14th national conference on nuclear physics medium and high energy physics and hadron physics)
[en] Based on radioactive geophysical features and latest geological exploration, the authors studied uranium metallogenic regularity and exploration criteria, and made the conclusion that it has favourite metallogenic condition and prospect in the area. (authors)
[en] Highlights: •We design and fabricate an HTS band-pass filter with a very wide stopband. •The filter is designed using a method of staggered resonant modes. •A new topology of resonator suitable for this method is proposed. •The stopband is up to 26f0 with rejection better than 60 dB. -- Abstract: This letter presents a novel high-temperature superconducting (HTS) band-pass filter with a very wide stopband using the method of staggered resonant modes, that is, dissimilar resonators with the same fundamental frequency but different harmonic frequencies. A new type of resonator that is suitable for this method is proposed. The design rules and design process of this method are analyzed in detail. A six-pole HTS band-pass filter centered at 500 MHz with a 2 MHz bandwidth is successfully designed and fabricated. Measured out-of-band rejection is better than 60 dB and can reach up to 13 GHz, which is about 26 times the fundamental frequency
[en] South Jiangxi is beliaved favourite for uranium metallization, and has become an important volcanic rock type uranium-producing base in China. The authors summarize the distribution pattern,metallogenetic model, and prospecting strategy by studying relationship between uranium deposit feature and three volcanic cycles of mesozoic in Nanling and Wuyishan uranium-polymetallic belts, 4 uranium prospecting targets is delineated based on the theory of deep-source and multi-metallogenesis and several decades exploration experience. (authors)