Frictional interface crack-tip singular stress field in anisotropic

This study presents the asymptotic displacement and stress fields at the crack tip of frictional interface where slip can occur along the interface between two anisotropic composite laminates. The results show that real values corresponding to the order of stress singularities may exit at the crack tip of the frictional interface between two anisotropic layers. The order of stress singularity largely depends on the coefficient of friction within the interface and the material properties of anisotropic composite laminates such as fibre orientations

Structural damage identification from measured vibration modal data

Summary available: p.v

Light vector meson and heavy baryon strong interaction

We calculate the coupling constants between the light vector mesons and heavy baryons within the framework of the light-cone QCD sum rule in the leading order of heavy quark effective theory. Most resulting sum rules are stable with the variations of the Borel parameter and the continuum threshold. The extracted couplings will be useful in the study of the possible heavy baryon molecular states

Numerical modelling of coupled thermo-hydraulic problems for long-term geothermal reservoir productivity

The advent of geothermal energy has opened a new chapter in global energy demand, for clean, renewable, and sustainable sources. This energy form is harnessed by creating a reservoir in a formation that serves as a heat exchanger. Modelling provides a means of representing concepts and approaches in reservoir simulation. Several methods are proposed to simulate geothermal reservoir behaviour under long-term performance, but it is very hard to specify the most powerful and realistic approach in forecasting reservoir lifespan. The aim of this work is to evaluate two different approaches: equivalent porous media (EPM) and dual porosity- permeability (DPP) model, for simulating geothermal reservoir long-term performance and to assess the adequacy of these approaches. The finite element method is employed to develop and simulate the numerical models based on the two different approaches in forecasting the productivities of the reservoirs during exploitation period of 30 years. The parameters investigated are the temperature, density, and viscosity distribution under the influence of coupled thermal and hydraulic processes. The simulation results are analysed and compared with the different approaches using those parameters. The analysis indicates that both the approaches can efficiently estimate the long-term performance of a reservoir to some extent, but further investigations are required regarding the effect of other coupling terms

Deep Multiview Clustering by Contrasting Cluster Assignments

Multiview clustering (MVC) aims to reveal the underlying structure of multiview data by categorizing data samples into clusters. Deep learning-based methods exhibit strong feature learning capabilities on large-scale datasets. For most existing deep MVC methods, exploring the invariant representations of multiple views is still an intractable problem. In this paper, we propose a cross-view contrastive learning (CVCL) method that learns view-invariant representations and produces clustering results by contrasting the cluster assignments among multiple views. Specifically, we first employ deep autoencoders to extract view-dependent features in the pretraining stage. Then, a cluster-level CVCL strategy is presented to explore consistent semantic label information among the multiple views in the fine-tuning stage. Thus, the proposed CVCL method is able to produce more discriminative cluster assignments by virtue of this learning strategy. Moreover, we provide a theoretical analysis of soft cluster assignment alignment. Extensive experimental results obtained on several datasets demonstrate that the proposed CVCL method outperforms several state-of-the-art approaches.Comment: 10 pages, 7 figure

The Strong Decay Patterns of the 1−+1^{-+} Exotic Hybrid Mesons

We calculate the coupling constants of the decay modes $1^{-+}\rightarrow\rho\pi, f_1\pi, b_1\pi, \eta\pi, \eta'\pi, a_1\pi, f_1\eta$ within the framework of the light-cone QCD sum rule. Then we calculate the partial width of these decay channels, which differ greatly from the existing calculations using phenomenological models. For the isovector $1^{-+}$ state, the dominant decay modes are $\rho\pi, f_1\pi$. For its isoscalar partner, its dominant decay mode is $a_1\pi$. We also discuss the possible search of the $1^{-+}$ state at BESIII, for example through the decay chains $J/\psi (\psi')\to \pi_1 +\gamma$ or $J/\psi (\psi')\to \pi_1 +\rho$ where $\pi_1$ can be reconstructed through the decay modes $\pi_1\to \rho\pi\to \pi^+\pi^-\pi^0$ or $\pi_1\to f_1(1285)\pi^0$. Hopefully the present work will be helpful to the experimental establishment of the $1^{-+}$ hybrid meson.Comment: 14 pages, 10 figure