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Computations of Stable Homotopy Groups of Spheres and the Classification of Smooth Structures 认领 引用
1
《Bulletin of the Chinese Academy of Sciences》 2026年第2期97-100,共4页
Prof.WANG Guozhen,an outstanding mathematician from Fudan University,has won the 2026 Tan Kah Kee Young Scientist Award in Mathematics and Physics for his research on“Computations of Stable Homotopy Groups of Spheres... Prof.WANG Guozhen,an outstanding mathematician from Fudan University,has won the 2026 Tan Kah Kee Young Scientist Award in Mathematics and Physics for his research on“Computations of Stable Homotopy Groups of Spheres and the Classification of Smooth Structures.”WANG and his collaborators calculated the first 90 stems of the stable homotopy group of spheres,and established the deformation idea in homotopy theory.In particular,they proved that there is a unique differential structure on the 61-dimensional sphere,which is the last unknown case of the smooth generalized Poincaré conjecture in odd dimensions. 展开更多
关键词 classification smooth structures wang smooth structures deformation idea stable homotopy group computations Tan Kah Kee young scientist award stable homotopy groups spheres differential structure
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Electronic Structure Computations and Optical Spectroscopy Studies of ScNiBi and YNiBi Compounds 认领 引用
2
作者 Yury V.Knyazev Semyon T.Baidak +1 位作者 Yury I.Kuz’min Alexey V.Lukoyanov 《Computers, Materials & Continua》 SCIE EI 2025年第6期4085-4095,共11页
Thework presents the electronic structure computations and optical spectroscopy studies of half-Heusler ScNiBi and YNiBi compounds.Our first-principles computations of the electronic structures were based on density f... Thework presents the electronic structure computations and optical spectroscopy studies of half-Heusler ScNiBi and YNiBi compounds.Our first-principles computations of the electronic structures were based on density functional theory accounting for spin-orbit coupling.These compounds are computed to be semiconductors.The calculated gap values make ScNiBi and YNiBi valid for thermoelectric and optoelectronic applications and as selective filters.In ScNiBi and YNiBi,an intense peak at the energy of−2 eV is composed of theNi 3d states in the conduction band,and the valence band mostly contains these states with some contributions from the Bi 6p and Sc 3d or Y 4d electronic states.These states participate in the formation of the indirect gap of 0.16 eV(ScNiBi)and 0.18 eV(YNiBi).Within the spectral ellipsometry technique in the interval 0.22–15μm of wavelength,the optical functions of materials are studied,and their dispersion features are revealed.A good matching of the experimental and modeled optical conductivity spectra allowed us to analyze orbital contributions.The abnormally low optical absorption observed in the low-energy region of the spectrum is referred to as the results of band calculations indicating a small density of electronic states near the Fermi energy of these complex materials. 展开更多
关键词 Computational physics first-principles calculations electronic structure band gap excited states optical properties semiconductors complex materials optoelectronic applications
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Second-order two-scale computations for conductive radiative heat transfer problem in periodic porous materials 认领 引用 被引量：3
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作者 杨志强 崔俊芝 李博文 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第3期91-98,共8页
In this paper, a kind of second-order two-scale （SOTS） computation is developed for conductive-radiative heat trans- fer problem in periodic porous materials. First of all, by the asymptotic expansion of the tempera... In this paper, a kind of second-order two-scale （SOTS） computation is developed for conductive-radiative heat trans- fer problem in periodic porous materials. First of all, by the asymptotic expansion of the temperature field, the cell problem, homogenization problem, and second-order correctors are obtained successively. Then, the corresponding finite element al- gorithms are proposed. Finally, some numerical results are presented and compared with theoretical results. The numerical results of the proposed algorithm conform with those of the FE algorithm well, demonstrating the accuracy of the present method and its potential applications in thermal engineering of porous materials. 展开更多
关键词 second-order two-scale （SOTS） computations periodic porous materials conductive-radiativeheat transfer
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Computationally efficient direction finding using polynomial rooting with reduced-order and real-valued computations 认领 引用 被引量：3
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作者 Fenggang Yan Yi Shen +1 位作者 Ming Jin Xiaolin Qiao 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2016年第4期739-745,共7页
The root multiple signal classification（root-MUSIC） algorithm is one of the most important techniques for direction of arrival（DOA） estimation. Using a uniform linear array（ULA） composed of M sensors, this metho... The root multiple signal classification（root-MUSIC） algorithm is one of the most important techniques for direction of arrival（DOA） estimation. Using a uniform linear array（ULA） composed of M sensors, this method usually estimates L signal DOAs by finding roots that lie closest to the unit circle of a（2M-1）-order polynomial, where L 〈 M. A novel efficient root-MUSIC-based method for direction estimation is presented, in which the order of polynomial is efficiently reduced to 2L. Compared with the unitary root-MUSIC（U-root-MUSIC） approach which involves real-valued computations only in the subspace decomposition stage, both tasks of subspace decomposition and polynomial rooting are implemented with real-valued computations in the new technique,which hence shows a significant efficiency advantage over most state-of-the-art techniques. Numerical simulations are conducted to verify the correctness and efficiency of the new estimator. 展开更多
关键词 direction-of-arrival（DOA） estimation root multiple signal classification（root-MUSIC） real-valued computations reduced-order
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Novel Approach to Data Encryption Based on Matrix Computations 认领 引用 被引量：2
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作者 Rosilah Hassan Selver Pepic +2 位作者 Muzafer Saracevic Khaleel Ahmad Milan Tasic 《Computers, Materials & Continua》 SCIE EI 2021年第2期1139-1153,共15页
In this paper,we provide a new approach to data encryption using generalized inverses.Encryption is based on the implementation of weighted Moore–Penrose inverse A y MNenxmT over the nx8 constant matrix.The square He... In this paper,we provide a new approach to data encryption using generalized inverses.Encryption is based on the implementation of weighted Moore–Penrose inverse A y MNenxmT over the nx8 constant matrix.The square Hermitian positive definite matrix N8x8 p is the key.The proposed solution represents a very strong key since the number of different variants of positive definite matrices of order 8 is huge.We have provided NIST(National Institute of Standards and Technology)quality assurance tests for a random generated Hermitian matrix(a total of 10 different tests and additional analysis with approximate entropy and random digression).In the additional testing of the quality of the random matrix generated,we can conclude that the results of our analysis satisfy the defined strict requirements.This proposed MP encryption method can be applied effectively in the encryption and decryption of images in multi-party communications.In the experimental part of this paper,we give a comparison of encryption methods between machine learning methods.Machine learning algorithms could be compared by achieved results of classification concentrating on classes.In a comparative analysis,we give results of classifying of advanced encryption standard(AES)algorithm and proposed encryption method based on Moore–Penrose inverse. 展开更多
关键词 Security data encryption matrix computations cloud computing machine learning
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Three-Di mensional Computations of Multiple TandemJets in Crossflow 认领 引用 被引量：6
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作者 肖洋 李行伟 +1 位作者 唐洪武 YUDae-Young 《China Ocean Engineering》 SCIE EI 2006年第1期99-112,共14页
The mixing and merging characteristics of multiple tandem jets in crossflow are investigated by use of the Computational Fluid Dynamics （CFD） code FI,UENT. The realizable k - ε model is employed for turbulent elosu... The mixing and merging characteristics of multiple tandem jets in crossflow are investigated by use of the Computational Fluid Dynamics （CFD） code FI,UENT. The realizable k - ε model is employed for turbulent elosure of the Reynolds-averaged Navier-Stokes equations. Numerical experiments are performed for 1-, 2- and 4-jet groups, tbr jet-tocrossflow velocity ratios of R = 4.2 ～ 16.3. The computed velocity and scalar concentration field are in good agreement with experiments using Particle Image Velocimetry （PIV） and Laser Induced Fluorescence （LIF）, as well as previous work. The results show that the leading jet behavior is similar to a single free jet in crossflow, while all the downstream rear jets have less bent-over jet trajectories - suggesting a reduced ambient velocity for the rear jets. The concentration decay of the leading jet is greater than that of the rear jets. When normalized by appropriate crossflow momentum length scales, all jet trajectories follow a universal relation regardless of the sequential order of jet position and the nund）er of jets. Supported by the velocity and trajectory measurements, the averaged maximum effective crossflow velocity ratio is computed to be in the range of 0.39 to 0.47. 展开更多
关键词 jet in crossflow multiple jets realizable turbulence model mixing and transport computational fluid dynamics
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Aircraft noise and its nearfield propagation computations 认领 引用 被引量：8
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作者 Xin Zhang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2012年第4期960-977,共18页
Noise generated by civil transport aircraft during take-off and approach-to-land phases of operation is an environmental problem. The aircraft noise problem is firstly reviewed in this article. The review is followed ... Noise generated by civil transport aircraft during take-off and approach-to-land phases of operation is an environmental problem. The aircraft noise problem is firstly reviewed in this article. The review is followed by a description and assessment of a number of sound propagation methods suitable for applications with a background mean flow field pertinent to aircraft noise. Of the three main areas of the noise problem, i.e. generation, propagation, and ra- diation, propagation provides a vital link between near-field noise generation and far-field radiation. Its accurate assessment ensures the overall validity of a prediction model. Of the various classes of propagation equations, linearised Euler equations are often casted in either time domain or frequency domain. The equations are often solved numerically by computational aeroacoustics techniques, bur are subject to the onset of Kelvin-Helmholtz （K-H） instability modes which may ruin the solutions. Other forms of linearised equations, e.g. acoustic perturbation equations have been proposed, with differing degrees of success. 展开更多
关键词 Aircraft noise Computational aeroacoustics Sound propagation
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Generalization of Results of Computations and Natural Experiments at Steel Parts Quenching 认领 引用 被引量：2
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作者 Nikolai I.Kobasko Engineering Thermophysics Institute of National Academy of Sciences, Kyiv, Ukraine 《Journal of Shanghai Jiaotong university(Science)》 2000年第1期128-134,共7页
Complicated changes occur inside the steel parts during quenching process. A three dimensional nonlinear mathematical model for quenching process has been established and the numerical simulation on temperature field,... Complicated changes occur inside the steel parts during quenching process. A three dimensional nonlinear mathematical model for quenching process has been established and the numerical simulation on temperature field, microstructure and stress field has been realized. The alternative technique for the formation of high-strength materials has been developed on the basis of intensification of heat transfer at phase transformations. The technology for the achievement of maximum compressive residual stresses on the hard surface is introduced. It has been shown that there is an optimal depth of hard layer providing the maximum compression stresses on the surface. It has also been established that in the surface hard layer additional strengthening (superstrengthening) of the material is observed. The generalized formula for the determination of the time of reaching maximum compressive stresses on the surface has been proposed. 展开更多
关键词 Quenching Phase Transformation Temperature Field Stress Field Maximum Compressive Stresses Superstrengthening of Materials Generalization of Results of Computations.
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Efficient and Robust Design for Absorbing Boundary Conditions in Atomistic Computations 认领 引用 被引量：1
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作者 方明 唐少强 《Chinese Physics Letters》 SCIE EI CAS 2009年第11期148-151,共4页
We propose an efficient and robust way to design absorbing boundary conditions in atomistic computations. An optimal discrete boundary condition is obtained by minimizing a functional of a reflection coefficient integ... We propose an efficient and robust way to design absorbing boundary conditions in atomistic computations. An optimal discrete boundary condition is obtained by minimizing a functional of a reflection coefficient integral over a range of wave numbers. The minimization is performed with respect to a set of wave numbers, at which transparent absorption is reached. Compared with the optimization with respect to the boundary condition coefficients suggested by E and Huang [Phys. Rev. Lett. 87 （2001） 133501], we reduce considerably the number of independent variables and the computing cost. We further demonstrate with numerical examples that both the optimization and the wave absorption are more robust in the proposed design. 展开更多
关键词 Computational physics
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Efficient Data-parallel Computations on Distributed Systems 认领 引用
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作者 曾志勇 LU Xinda 《High Technology Letters》 EI CAS 2002年第3期92-96,共5页
Task scheduling determines the performance of NOW computing to a large extent. However, the computer system architecture, computing capability and system load are rarely proposed together. In this paper, a biggest het... Task scheduling determines the performance of NOW computing to a large extent. However, the computer system architecture, computing capability and system load are rarely proposed together. In this paper, a biggest heterogeneous scheduling algorithm is presented. It fully considers the system characteristics (from application view), structure and state. So it always can utilize all processing resource under a reasonable premise. The results of experiment show the algorithm can significantly shorten the response time of jobs. 展开更多
关键词 parallel algorithms heterogeneous computing message passing load balancing
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OPTIMAL SCHEME FOR SEQUENTIAL COMPUTATIONS OF F_m(z) INTEGRALS IN AB INITIO CALCULATIONS----COMBINATORY USE OF UPWARD AND DOWNWARD RECURSIONS 认领 引用
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《Chemical Research in Chinese Universities》 SCIE CAS 1986年第1期76-84,共9页
The quantitative rules of the transfer and variation of errors,when the Gaussian integral functions F.(z) are evaluated sequentially by recurring,have been expounded.The traditional viewpoint to negate the applicabili... The quantitative rules of the transfer and variation of errors,when the Gaussian integral functions F.(z) are evaluated sequentially by recurring,have been expounded.The traditional viewpoint to negate the applicability and reliability of upward recursive formula in principle is amended.An optimal scheme of upward-and downward-joint recursions has been developed for the sequential F(z) computations.No additional accuracy is needed with the fundamental term of recursion because the absolute error of Fn(z) always decreases with the recursive approach.The scheme can be employed in modifying any of existent subprograms for Fn computations.In the case of p-d-f-and g-type Gaussians,combining this method with Schaad's formulas can reduce,at least,the additive operations by a factor 40%;the multiplicative and exponential operations by a factor 60%. 展开更多
关键词 COMBINATORY USE OF UPWARD AND DOWNWARD RECURSIONS INTEGRALS IN AB INITIO CALCULATIONS OPTIMAL SCHEME FOR SEQUENTIAL COMPUTATIONS OF F_m down AB
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On the Tempo-Spatial Evolution of the Lower Ionospheric Perturbation for the 2016 Kumamoto Earthquakes from Comparisons of VLF Propagation Data Observed at Multiple Stations with Wave-Hop Theoretical Computations 认领 引用 被引量：1
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作者 Tomokazu Asano Masashi Hayakawa 《Open Journal of Earthquake Research》 2018年第3期161-185,共25页
There have been published many papers on VLF (very low frequency) characteristics to study seismo-ionospheric perturbations. Usually VLF records (amplitude and/or phase) are used to investigate mainly the temporal evo... There have been published many papers on VLF (very low frequency) characteristics to study seismo-ionospheric perturbations. Usually VLF records (amplitude and/or phase) are used to investigate mainly the temporal evolution of VLF propagation anomalies with special attention to one particular propagation path. The most important advantage of this paper is the simultaneous use of several propagation paths. A succession of earthquakes (EQs) happened in the Kumamoto area in Kyusyu Island;two strong foreshocks with magnitude of 6.5 and 6.4 on 14 April (UT) and the main shock with magnitude 7.3 on 15 April (UT). Because the EQ epicenters are not far from the VLF transmitter (with the call sign of JJI in Miyazaki prefecture), we can utilize simultaneously 8 observing stations of our network all over Japan. Together with the use of theoretical computations based on wave-hop theory, we try to trace both the temporal and spatial evolutions of the ionospheric perturbation associated with this succession of EQs. It is found that the ionospheric perturbation begins to appear about two weeks before the EQs, and this perturbation becomes most developed 5 - 3 days before the main shock. When the perturbation is most disturbed, the maximum change in vertical direction is depletion in the VLF effective ionospheric height of the order of 10 km, and its horizontal scale (or its radius) is about 1000 km. These spatio-temporal changes of the seismo-ionospheric perturbation will be investigated in details in the discus-sion, a comparison has made with the VLF characteristics of the 1995 Kobe with the same magnitude and of the same fault-type, and a brief discussion on the generation mechanism of seismo-ionospheric perturbation is finally made. 展开更多
关键词 VLF/LF Propagation Anomaly Ionospheric Perturbations Earthquake Precursor Earthquake Prediction the 2016 Kumamoto Earthquakes Japanese VLF/LF Network Wave-Hop Computation Nighttime Fluctuation Method Atmospheric Oscillation Hypothesis
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Efficient self-testing system for quantum computations based on permutations 认领 引用
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作者 Shuquan Ma Changhua Zhu +1 位作者 Min Nie Dongxiao Quan 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第4期61-73,共13页
Verification in quantum computations is crucial since quantum systems are extremely vulnerable to the environment.However,verifying directly the output of a quantum computation is difficult since we know that efficien... Verification in quantum computations is crucial since quantum systems are extremely vulnerable to the environment.However,verifying directly the output of a quantum computation is difficult since we know that efficiently simulating a large-scale quantum computation on a classical computer is usually thought to be impossible.To overcome this difficulty,we propose a self-testing system for quantum computations,which can be used to verify if a quantum computation is performed correctly by itself.Our basic idea is using some extra ancilla qubits to test the output of the computation.We design two kinds of permutation circuits into the original quantum circuit:one is applied on the ancilla qubits whose output indicates the testing information,the other is applied on all qubits(including ancilla qubits) which is aiming to uniformly permute the positions of all qubits.We show that both permutation circuits are easy to achieve.By this way,we prove that any quantum computation has an efficient self-testing system.In the end,we also discuss the relation between our self-testing system and interactive proof systems,and show that the two systems are equivalent if the verifier is allowed to have some quantum capacity. 展开更多
关键词 quantum computation verification self-testing systems complexity theory
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Adaptive Lagrange finite element methods for high precision vibrations and piezoelectric acoustic wave computations in SMT structures and plates with nano interfaces 认领 引用
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作者 张武 洪涛 《Journal of Zhejiang University Science》 2002年第1期6-12,共7页
This paper discusses the validity of (adaptive) Lagrange generalized plain finite element method (FEM) and plate element method for accurate analysis of acoustic waves in multi-layered piezoelectric structures with ti... This paper discusses the validity of (adaptive) Lagrange generalized plain finite element method (FEM) and plate element method for accurate analysis of acoustic waves in multi-layered piezoelectric structures with tiny interfaces between metal electrodes and surface mounted piezoelectric substrates. We have come to conclusion that the quantitative relationships between the acoustic and electric fields in a piezoelectric structure can be accurately determined through the proposed finite element methods. The higher-order Lagrange FEM proposed for dynamic piezoelectric computation is proved to be very accurate (prescribed relative error 0.02% - 0.04% ) and a great improvement in convergence accuracy over the higher order Mindlin plate element method for piezoelectric structural analysis due to the assumptions and corrections in the plate theories.The converged lagrange finite element methods are compared with the plate element methods and the computedresults are in good agreement with available exact and experimental data. The adaptive Lagrange finite elementmethods and a new FEA computer program developed for macro- and micro-scale analyses are reviewed, and recently extended with great potential to high-precision nano-scale analysis in this paper and the similarities between piezoelectric and seismic wave propagations in layered structures and plates are stressed. 展开更多
关键词 Lagrangian finite element surface mount resonator structure plate element anisotropic piezoelectric quartz material acoustic wave computational nano\|dynamics SMT(surface mount technology)
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Representing Increasing Virtual Machine Security Strategy in Cloud Computing Computations 认领 引用 被引量：1
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作者 Mohammad Shirzadi 《Electrical Science & Engineering》 2021年第2期7-16,共10页
This paper proposes algorithm for Increasing Virtual Machine Security Strategy in Cloud Computing computations.Imbalance between load and energy has been one of the disadvantages of old methods in providing server and... This paper proposes algorithm for Increasing Virtual Machine Security Strategy in Cloud Computing computations.Imbalance between load and energy has been one of the disadvantages of old methods in providing server and hosting,so that if two virtual severs be active on a host and energy load be more on a host,it would allocated the energy of other hosts(virtual host)to itself to stay steady and this option usually leads to hardware overflow errors and users dissatisfaction.This problem has been removed in methods based on cloud processing but not perfectly,therefore,providing an algorithm not only will implement a suitable security background but also it will suitably divide energy consumption and load balancing among virtual severs.The proposed algorithm is compared with several previously proposed Security Strategy including SC-PSSF,PSSF and DEEAC.Comparisons show that the proposed method offers high performance computing,efficiency and consumes lower energy in the network. 展开更多
关键词 Cloud computing High performance computing Automation Security Server
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Symbolic and Graphical Computations of a Class of Slightly Perturbed Equations 认领 引用
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作者 Mohammed A. Sharaf Abdel-naby S. Saad Zainab A. Mominkhan 《Applied Mathematics》 2013年第5期817-824,共8页
In this paper, a class of slightly perturbed equations of the form F(x)= ξ -x+αΦ(x) will be treated graphically and symbolically, where Φ(x) is an analytic function of x. For graphical developments, we set up a si... In this paper, a class of slightly perturbed equations of the form F(x)= ξ -x+αΦ(x) will be treated graphically and symbolically, where Φ(x) is an analytic function of x. For graphical developments, we set up a simple graphical method for the real roots of the equation F(x)=0 illustrated by four transcendental equations. In fact, the graphical solution usually provides excellent initial conditions for the iterative solution of the equation. A property avoiding the critical situations between divergent to very slow convergent solutions may exist in the iterative methods in which no good initial condition close to the root is available. For the analytical developments, literal analytical solutions are obtained for the most celebrated slightly perturbed equation which is Kepler’s equation of elliptic orbit. Moreover, the effect of the orbital eccentricity on the rate of convergence of the series is illustrated graphically. 展开更多
关键词 Symbolic Computation Small Perturbations Graphical Representations Transcendental Equations
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Realistic Efficiency Evaluations for Parallel Computations under Workstation Cluster 认领 引用
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作者 Mo Zeyao Li Xiaomei 《Wuhan University Journal of Natural Sciences》 CAS 1996年第Z1期329-336,共8页
In recent years, high performance scientific computing under workstation cluster connected by local area network is becoming a hot point. Owing to both the longer latency and the higher overhead for protocol processin... In recent years, high performance scientific computing under workstation cluster connected by local area network is becoming a hot point. Owing to both the longer latency and the higher overhead for protocol processing compared with the powerful single workstation capacity, it is becoming severe important to keep balance not only for numerical load but also for communication load, and to overlap communications with computations while parallel computing. Hence,our efficiency evaluation rules must discover these capacities of a given parallel algorithm in order to optimize the existed algorithm to attain its highest parallel efficiency. The traditional efficiency evaluation rules can not succeed in this work any more. Fortunately, thanks to Culler's detail discuss in LogP model about interconnection networks for MPP systems, we present a system of efficiency evaluation rules for parallel computations under workstation cluster with PVM3.0 parallel software framework in this paper. These rules can satisfy above acquirements successfully. At last, two typical synchronous,and asynchronous applications are designed to verify the validity of these rules under 4 SGIs workstations cluster connected by Ethernet. 展开更多
关键词 parallel efficiency evaluation workstation cluster,PVM. network parallel computations.
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Kernel Optimization on Short-Range Potentials Computations in Molecular Dynamics Simulations 认领 引用
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作者 Xianmeng Wang Jianjiang Li +2 位作者 Jue Wang Xinfu He Ningming Nie 《国际计算机前沿大会会议论文集》 EI 2015年第B12期67-69,共3页
We present multi-threading and SIMD optimizations on short-range potential calculation kernel in Molecular Dynamics.For the multi-threading optimization,we design a partition-and-two-steps(PTS)method to avoid write co... We present multi-threading and SIMD optimizations on short-range potential calculation kernel in Molecular Dynamics.For the multi-threading optimization,we design a partition-and-two-steps(PTS)method to avoid write conflicts caused by using Newton’s third law.Our method eliminates serialization bottle-neck without extra memory.We implement our PTS method using OpenMP.Afterwards,we discuss the influence of the cutoff if statement on the performance of vectorization in MD simulations.We propose a pre-searching neighbors method,which makes about 70%atoms meet the cutoff check,reducing a large amount of redundant calculation.The experiment results prove our PTS method is scalable and efficient.In double precision,our 256-bit SIMD implementation is about 3×faster than the scalar version. 展开更多
关键词 Molecular dynamics EAM SIMD Vectorization OpenMP Short-range potential High-performance computing
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Modelling thermomechanical fracturing in underground hydrogen storage in salt caverns 认领 引用
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作者 Hajar Habbani Hippolyte Djizanne +1 位作者 Benoit Brouard Amade Pouya 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第6期4263-4277,共15页
In gas storage operations,intensive injection and withdrawal cycles can introduce structural failure due to thermally induced stresses,leading to the detachment of overhanging blocks from salt cavern walls.This study ... In gas storage operations,intensive injection and withdrawal cycles can introduce structural failure due to thermally induced stresses,leading to the detachment of overhanging blocks from salt cavern walls.This study investigates the thermomechanical mechanisms governing block detachment in underground hydrogen storage using a joint enriched finite element method(JFEM)combined with cohesive zone modelling in DISROC software.An axisymmetric cavern geometry based on the Huntorf NK1 design is modelled,incorporating three overhanging blocks and both steady-state and transient creep components in the salt mechanical response.Comparative analysis of two salt types(fast-creeping Etrez and slow-creeping Asse)under identical thermomechanical loading reveals that rapid wall cooling during depressurisation(−13.8 bar/d)induces thermal contraction and tensile stresses exceeding rock salt tensile strength(1.5 MPa).Critical fracture initiation occurs at~15℃ regardless of salt type,with block detachment sequences nearly identical between both salts(timing difference<6 h).The results demonstrate that thermal stresses(1 MPa/℃ cooling)dominate failure mechanisms over steady-state creep,while transient creep accelerates stress redistribution and damage localisation.These findings highlight that temperature control,rather than creep properties,governs cavern stability,emphasising the critical need for thermal monitoring and controlled depressurisation rates in underground hydrogen storage operations. 展开更多
关键词 Fracture mechanics Salt cavern Numerical computations DISROC Thermal fracturing Hydrogen storage
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Quantum computing-enhanced topology optimization with stress constraints for truss structures 认领 引用 被引量：2
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作者 Yan Wang Dixiong Yang +1 位作者 Zhenzeng Lei Guohai Chen 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第6期41-57,共17页
Quantum computing,leveraging the properties of quantum physics such as quantum superposition and entanglement,possesses the potential for exponential acceleration compared to classical computing.It can significantly e... Quantum computing,leveraging the properties of quantum physics such as quantum superposition and entanglement,possesses the potential for exponential acceleration compared to classical computing.It can significantly enhance solution efficiency in topology optimization and effectively avoid the entrapment in local optima.This paper proposes a hybrid classical-quantum computing framework to solve the stress-constrained topology optimization problem for truss structures.Initially,structural analyses are performed on a classical computer to determine the stresses of truss members.Then,the optimization problem is formulated through incremental updates of member cross-sectional areas to make it compatible with a quantum annealer.The update strategy consists of a directional-control function and a magnitude-control function.By embedding stress constraints directly into the directional-control function,the original optimization problem is reformulated as a quadratic unconstrained binary optimization model suitable for quantum annealing.To realize a balance between solution accuracy and iteration efficiency,a dynamic strategy for adjusting the magnitude of area increments is proposed.Thus,the quantum annealer can effectively achieve the optimal solutions.When only the access time of the quantum processing unit is considered,the results from 2D and 3D examples of truss topology optimization validate the effectiveness of the proposed framework,and demonstrate the great potential of quantum computing in structural optimization. 展开更多
关键词 Topology optimization Truss structures Quantum computing Quantum annealing algorithm Quadratic unconstrained binary optimization problem
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