13,254 research outputs found
Non-strange partner of strangeonium-like state Y(2175)
Inspired by the observed Y(2175) state, we predict its non-strange partner
Y(1915), which has a resonance structure with mass around 1915 MeV and width
about MeV. Experimental search for Y(1915) is proposed by
analyzing the or invariant mass spectrum of
the and processes, which are accessible at Belle, BaBar, BESIII and
forthcoming BelleII. Considering similarity between two families, the
comparison of the mass spectra of and families can provide
important information on the 1D state of family, , which has
a very broad resonance structure with mass around 1910 MeV regarded as the
strangeonium partner of . This also answers the question why the
1D state is still missing in experiment. This is supported by our
former study on the properties of Y(2175), which explains Y(2175) as the 2D
strangeonium because our theoretical total width is comparable with the Belle
data.Comment: 5 pages, 5 figures. More discussions and numerical results added.
Typos correcte
The Construction Practice of Informatization Ecosystem in Chinese Universities Based on Big Data of Education
The wave of digital reform boosts the layout and construction of university informatization. However, in view of the current problems of university informatization construction, such as inadequate overall planning of system construction, ineffective interoperability of some business system data, high construction cost, and unclear division of responsibilities of system management, the article explores a general idea of digital reform based on the reality of “information islands” and “data chimney” in school education big data, In combination with the actual situation of the school, it has planned and put into practice the idea of the school’s digital reform, built the school’s “digital intelligent medical university” information ecosystem, designed and formed the “1614” digital reform work theoretical system from the top planning, consolidated the construction of the school’s education big data warehouse, committed to data collection, governance and sharing, gathered data resources, and formed a brain-like system to help teaching decision-making, Build a “cloud” supported teaching resource supply system to help borderless teaching, and finally build a personalized teaching ecological model based on education big data
Hemicellulose-g-PAAc/TiO2 Nanocomposite Hydrogel for Dye Removal
Dyes pollution on urban environment is of great concern because of the human health hazards associated with this kind of contaminants, and the use of low-cost photocatalytic composite material is an efficient treatment method to minimize the environmental impact. A novel hemicellulose-g-PAAc/TiO2 composite hydrogel was prepared as a promising alternative material for dye removal. Wheat straw hemicellulose and TiO2 nanoparticles were first modified and then incorporated into hydrogel via covalent bonds. Effects of gel dosage, pH, initial concentration and contact time on the adsorption amount of methylene blue were systematically studied using the prepared hydrogel. The equilibrium adsorption data was fitted well to the Freundlich isotherm model, and Langmuir isotherm analysis indicated that the adsorption capacity of the hemicellulose-g-PAAc/TiO2 composite hydrogel was 389.1 mg/g, and adsorption kinetic study showed that the adsorption process can be described by the pseudo second-order kinetic model. The prepared composite hydrogel exhibited high photodegradation ability for methylene blue under alkaline conditions, and all results indicated that the hemicellulose-g-PAAc/TiO2 composite hydrogel had excellent photocatalytic degradability for dyes, which can be used in practical process
Modeling and Control of Discrete Event Systems Using Finite State Machines with Variables and Their Applications in Power Grids
Control theories for discrete event systems modeled as finite state machines have been well developed to address various fundamental control issues. However, finite state machine model has long suffered from the problem of state explosion that renders it unsuitable for some practical applications. In an attempt to mitigate the state explosion problem, we propose an efficient representation that appends finite sets of variables to finite state machines in modeling discrete event systems. We also present the control synthesis techniques for such finite state machines with variables (FSMwV). We first present our notion and means of control under this representation. We next present our algorithms for both offline and online synthesis of safety control policies. We then apply these results to the control of electric power grids
Quantum dynamics of topological strings in a frustrated Ising antiferromagnet
We investigate the quantum dynamics of the transverse field Ising model on
the triangular lattice through large-scale quantum Monte Carlo simulations and
stochastic analytic continuation. At weak transverse field, we capture for the
first time the excitations related to topological quantum strings, which
exhibits continuum features described by XY chain along the strings and those
in accord with "Luttinger string liquid" in the perpendicular direction. The
continuum features can be well understood from the perspective of topological
strings. Furthermore, we identify the contribution of strings from the
excitation spectrum. Our study provides characteristic features for the
experimental search for string-related excitations and proposes a new
theoretical method to pinpoint topological excitations in the experimental
spectra.Comment: 10 pages, 9 figures, comments are welcome and more information at
http://cqutp.org/users/xfzhang
Lithium-Excess Research of Cathode Material Li2MnTiO4 for Lithium-Ion Batteries
Lithium-excess and nano-sized Li2+xMn1−x/2TiO4 (x = 0, 0.2, 0.4) cathode materials were synthesized via a sol-gel method. The X-ray diffraction (XRD) experiments indicate that the obtained main phases of Li2.0MnTiO4 and the lithium-excess materials are monoclinic and cubic, respectively. The scanning electron microscope (SEM) images show that the as-prepared particles are well distributed and the primary particles have an average size of about 20–30 nm. The further electrochemical tests reveal that the charge-discharge performance of the material improves remarkably with the lithium content increasing. Particularly, the first discharging capacity at the current of 30 mA g−1 increases from 112.2 mAh g−1 of Li2.0MnTiO4 to 187.5 mAh g−1 of Li2.4Mn0.8TiO4. In addition, the ex situ XRD experiments indicate that the monoclinic Li2MnTiO4 tends to transform to an amorphous state with the extraction of lithium ions, while the cubic Li2MnTiO4 phase shows better structural reversibility and stability
Effects of Vanadium doping on BaFe2As2
We report an investigation of the structural, magnetic and electronic
properties of Ba(Fe(1-x)V(x))2As2 using x-ray, transport, magnetic
susceptibility and neutron scattering measurements. The vanadium substitutions
in Fe sites are possible up to 40\%. Hall effect measurements indicate strong
hole-doping effect through V doping, while no superconductivity is observed in
all samples down to 2K. The antiferromagnetic and structural transition
temperature of BaFe2As2 is gradually suppressed to finite temperature then
vanishes at x=0.245 with the emergence of spin glass behavior, suggesting an
avoided quantum critical point (QCP). Our results demonstrate that the avoided
QCP and spin glass state which were previously reported in the superconducting
phase of Co/Ni-doped BaFe2As2 can also be realized in non-superconducting
Ba(Fe(1-x)V(x))2As2.Comment: 5 pages, 6 figure
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