The decoupling expansion of debris plasma refers to the process where debris plasma generated by a high-altitude nuclear explosion (HANE) slips through the ambient plasma. Unlike the coupled expansion of the debris pl...
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The Distributed Shared Memory(DSM)architecture is widely used in today’s computer design to mitigate the ever-widening processing-memory gap,and it inevitably exhibits Non-Uniform Memory Access(NUMA)to shared-memory ...
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The Distributed Shared Memory(DSM)architecture is widely used in today’s computer design to mitigate the ever-widening processing-memory gap,and it inevitably exhibits Non-Uniform Memory Access(NUMA)to shared-memory parallel *** to adapt to the NUMA effect can significantly downgrade application performance,especially on today’s manycore platforms with tens to hundreds of ***,traditional approaches such as first-touch and memory policy fall short in false page-sharing,fragmentation,or ease of *** this paper,we propose a partitioned shared-memory approach that allows multithreaded applications to achieve full NUMA-awareness with only minor code changes and develop an accompanying NUMA-aware heap manager which eliminates false page-sharing and minimizes *** on a 256-core cc-NUMA computing node show that the proposed approach helps applications to adapt to NUMA with only minor code changes and improves the performance of typical multithreaded scientific applications by up to 4.3 folds with the increased use of cores.
We introduce Σ-Attention, a Transformer-based operator-learning framework to address a key computational challenge in correlated materials. Our approach utilizes an Encoder-Only Transformer as an ansatz to approximat...
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A nonlinear Schrödinger equation for short ultraintense laser pulses in an underdense plasma has been discussed,and three types explicit exact solutions of this equation are obtained by using analytical method.
A nonlinear Schrödinger equation for short ultraintense laser pulses in an underdense plasma has been discussed,and three types explicit exact solutions of this equation are obtained by using analytical method.
The characterization of quantum correlations in many-body systems is instrumental to understanding the nature of emergent phenomena in quantum materials. The correlation entropy serves as a key metric for assessing th...
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The study of band connectivity is a fundamental problem in condensed matter physics. Here, we develop a method for analyzing band connectivity, which completely solves the outstanding questions of the reducibility and...
The study of band connectivity is a fundamental problem in condensed matter physics. Here, we develop a method for analyzing band connectivity, which completely solves the outstanding questions of the reducibility and decomposition of band complexes. By translating the symmetry conditions into a set of band balance equations, we show that all possible band structure solutions can be described by a positive affine monoid structure, which has a unique minimal set of generators, called Hilbert basis. We show that Hilbert basis completely determines whether a band complex is reducible and how it can be decomposed. The band complexes corresponding to Hilbert basis vectors, termed as Hilbert band complexes (HBCs), can be regarded as elementary building blocks of band structures. We develop algorithms to construct HBCs, analyze their graph features, and merge them into large complexes. We find some interesting examples, such as HBCs corresponding to complete bipartite graphs, and complexes that can grow without bound by successively merging a HBC.
In this paper, a Petrov-Galerkin scheme named the Runge-Kutta control volume （RKCV） discontinuous finite ele- ment method is constructed to solve the one-dimensional compressible Euler equations in the Lagrangian co...
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In this paper, a Petrov-Galerkin scheme named the Runge-Kutta control volume （RKCV） discontinuous finite ele- ment method is constructed to solve the one-dimensional compressible Euler equations in the Lagrangian coordinate. Its advantages include preservation of the local conservation and a high resolution. Compared with the Runge-Kutta discon- tinuous Galerkin （RKDG） method, the RKCV method is easier to implement. Moreover, the advantages of the RKCV and the Lagrangian methods are combined in the new method. Several numerical examples are given to illustrate the accuracy and the reliability of the algorithm.
Since the successful synthesis of the MoSSe monolayer, which violated the out-of-plane mirror symmetry of transition metal dichalcogenide monolayers, considerable and systematic research has been conducted on Janus mo...
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Since the successful synthesis of the MoSSe monolayer, which violated the out-of-plane mirror symmetry of transition metal dichalcogenide monolayers, considerable and systematic research has been conducted on Janus monolayer materials. By systematically analyzing the LaBrI monolayer, we are able to learn more about the novel Janus material by focusing on the halogen family next to group VIA (S, Se, Te). The structural optimizations have been carried out using pseudopotential-based Quantum Espresso code. Computed structural parameters are in good agreement with literature reports. The optimized crystal structures are used for computing the effect of strain on electronic and thermoelectric properties. Dynamical stability predicts that this material can withstand up to 10% of tensile strain. Computed electronic structure reveals material to be indirect wide band-gap ferromagnet with magnetic moment 1 µB. With increase in the biaxial tensile strain the band gap decreases. Furthermore, the computed magnetothermoelectric properties predict high Seebeck coefficient ∼400 µV/K and low thermal conductivity of ∼0.93 W/m K in LaBrI, which results in a high ZT∼1.84 for 4% strain at 800 K. The present study supports the fact that tensile strain on ferromagnetic LaBrI material can further enhance TE properties, making it a promising material for TE applications at higher temperatures.
Weakly bound systems provide possibilities to study nonlocal electronic decay processes, which present unique physical and chemical properties. Here we report the experimental observation of a nonlocal decay process, ...
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Weakly bound systems provide possibilities to study nonlocal electronic decay processes, which present unique physical and chemical properties. Here we report the experimental observation of a nonlocal decay process, i.e., nonadiabatic-coupling-mediated charge transfer (NCMCT), in argon dimer. This process can be effectively produced and manipulated by the double electron capture in low-charge-state oxygen ion collisions. Compared to other common decay mechanisms of Ar2 dication, the NCMCT process results in notably different kinetic energy releases for the Ar++Ar+ channel. It is due, revealed by theoretical calculations, to the special potential energy curve of the responsible Ar2+−Ar state that possesses many crossing points and thus nonadiabatically couples with the Ar+−Ar+* states in a wide internuclear distance range. Such an NCMCT process is expected to be a general process occurring in weakly bound systems when highly excited. The present work provides a prime collision system to explore the charge transfer in ion-molecule reactions and also brings insight into cluster dissociation mechanism.
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