检索结果-南通市图书馆

Decision making module based on stochastic magnetic tunnel junctions

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 202-209页

作者： Yifan Miao Li Zhao Yajun Zhang Zhe Yuan center for Advanced Quantum Studies and Department of physics Beijing Normal University Institute for Nanoelectric Devices and Quantum Computing Fudan University Interdisciplinary center for theoretical physics and Information Sciences Fudan University

In biological neural systems, noise is ubiquitous but does not affect the correct decisions made in the complex cognitive ***-making in biological neural system is typically achieved by accumulating input information over a period of *** by recent developments in neurosciences, we design a decision-making module based on spintronic devices, utilizing superparamagnetic tunnel junctions as artificial neurons. The feasibility of this decision-making module is verified through circuit simulations. Taking a multi-layer perceptron as an example, the module significantly improves the accuracy of the perceptron in the handwritten digit recognition task. Furthermore, the spintronic decision-making module offers advantages over the conventional pooling methods, such as adaptive decision time, high performance and the absence of analog-to-digital conversion. The decision-making module is flexible to be integrated into artificial neural networks and provides a general yet effective solution to enhance performance against device noise.

关键词：

theoretical studies on s RNA-mediated regulation in bacteria

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese physics B 2015年第12期24卷 38-44页

作者：常晓雪徐留芳史华林 State Key Laboratory of theoretical physics Institute of Theoretical Physics Chinese Academy of Sciences Department of physics and theoretical physics center Jilin University

Small RNA（sRNA）-mediated post-transcriptional regulation differs from protein-mediated regulation. Through basepairing, sRNA can regulate the target m RNA in a catalytic or stoichiometric manner. Some theoretical models were built for comparison of the protein-mediated and sRNA-mediated modes in the steady-state behaviors and noise properties. Many experiments demonstrated that a single sRNA can regulate several m RNAs, which causes crosstalk between the ***, we focus on some models in which two target mRNAs are silenced by the same sRNA to discuss their crosstalk features. Additionally, the sequence-function relationship of sRNA and its role in the kinetic process of base-pairing have been highlighted in model building.

关键词： sRNA-mediated regulation kinetic model crosstalk

Manipulation of multiple electromagnetically induced two-photon transparency in a six-level atomic system

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2009年第6期18卷 2282-2287页

作者：贾文志王顺金 center of theoretical physics School of PhysicsSichuan University

In the five-level K-type atomic system, by using another control field to couple the excited level of the coupling transition to the sixth higher excited level, a six-level atomic system is constructed. In this system, the multiple electromagnetically induced two-photon transparency has been investigated. What is more, if choosing the parameters of the control fields properly the triple transparency window will reduce to a double one which means that the multiple electromagnetically induced two-photon transparency can be manipulated in this system. The physical interpretation of these phenomena is given in terms of the dressed states and the dark states.

关键词： electromagnetically induced transparency dressed states dark states

Reconstructing the Potential Function in a Formulation of Quantum Mechanics Based on Orthogonal Polynomials

在线全文

学校读者我要写书评

暂无评论

Communications in theoretical physics 2017年第12期67卷 711-728页

作者： A.D.Alhaidari Saudi center for theoretical physics

In a recent reformulation of quantum mechanics, the properties of the physical system are derived from orthogonal polynomials that make up the expansion coefficients of the wavefunction in a complete set of square integrable basis. Here, we show how to reconstruct the potential function so that a correspondence with the standard formulation could be established. However, the correspondence places restriction on the kinematics of such problems.

关键词： wavefunction potential function orthogonal polynomials recursion relation tridiagonal representations asymptotics

Silk damping in scalar-induced gravitational waves: a novel probe for new physics

在线全文

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 79-85页

作者： Yan-Heng Yu Sai Wang theoretical physics Division Institute of High Energy Physics Chinese Academy of Sciences School of physics University of Chinese Academy of Sciences

Silk damping is well known in the study of cosmic microwave background（CMB） and accounts for suppression of the angular power spectrum of CMB on large angular multipoles. In this article, we study the effect of Silk damping on the scalar-induced gravitational waves（SIGWs）. Resulting from the dissipation of cosmic fluid, the Silk damping notably suppresses the energydensity spectrum of SIGWs on scales comparable to a diffusion scale at the decoupling time of weakly-interacting particles. The effect offers a novel observable for probing the underlying particle interaction, especially for those mediated by heavy gauge bosons beyond the standard model of particles. We anticipate that pulsar timing arrays are sensitive to gauge bosons with mass ～10～3-10～4 GeV, while space-and ground-based interferometers to those with mass ～10～7-1012GeV, leading to essential complements to on-going and future experiments of high-energy physics.

关键词：

Natural orbital description of the halo nucleus 6He

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2017年第12期28卷 237-243页

作者： Chrysovalantis Constantinou Mark A.Caprio James P.Vary Pieter Maris present address:center for theoretical physics Sloane Physics LaboratoryYale UniversityNew HavenCT 06520-8120USA Department of physics University of Notre DameNotre DameIN 46556-5670USA Department of physics and Astronomy Iowa State UniversityAmesIA 50011-3160USA

Ab initio calculations of nuclei face the challenge of simultaneously describing the strong short-range internucleon correlations and the long-range properties of weakly bound halo nucleons. Natural orbitals, which diagonalize the one-body density matrix, provide a basis which is better matched to the physical structure of the many-body wave function. We demonstrate that the use of natural orbitals significantly improves convergence for ab initio no-core configuration interaction calculations of the neutron halo nucleus ~6He, relative to the traditional oscillator basis.

关键词： Neutron halo nucleus 6He Nuclear structure Nuclear theory

Analysis of the Low-Lying Spectra of Five-Nucleon Systems

在线全文

学校读者我要写书评

暂无评论

Chinese physics Letters 2000年第7期17卷 485-487页

作者： BAO Cheng-Guang center of theoretical Nuclear physics National Laboratory of Heavy Ion AcceleratorLanzhou 730000 Department of physics Zhongshan UniversityGuangzhou 510275(mailing address)

The wavefunctions are decomposed into components. The inherent nodal structure and the stability of these components are investigated. It is assumed that the low-lying states would be dominated by the components without inherent nodal surfaces. Based on this assumption, the composition of the wave functions of the low-lying states of 5He has been suggested and the qualitative feature of the spectrum has been explained.

关键词： nodal assumed qualitative

Universality of a Critical Magnetic Field in a Holographic Superconductor

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese physics Letters 2015年第4期32卷 113-117页

作者： D.Momeni R.Myrzakulov Eurasian International center for theoretical physics and Department of General and theoretical physics Eurasian National University

We study aspects of holographic superconductors analytically in the presence of a constant external magnetic field. It is shown that the critical temperature and the critical magnetic field can be calculated at nonzero temperature. We detect the Meissner effect in such superconductors. A universal relation between black hole mass and critical magnetic field Hc is proposed to be Hc/M2/3≤0.687365. We also discuss some aspects of phase transition in terms of black hole entropy and Bekenstein＇s entropy to the energy upper bound.

关键词： CRITICAL magnetic field SUPERCONDUCTORS CRITICAL temperature (Chemistry) COSMOLOGICAL constants RIEMANNIAN manifolds BLACK holes (Astronomy)

The detection, extraction and parameter estimation of extreme-mass-ratio inspirals with deep learning

在线全文

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 86-96页

作者： Qianyun Yun Wen-Biao Han Yi-Yang Guo He Wang Minghui Du Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Shanghai Astronomical Observatory Chinese Academy of Sciences School of physics and Astronomy Shanghai Jiao Tong University School of Astronomy and Space Science University of Chinese Academy of Sciences Taiji Laboratory for Gravitational Wave Universe (Beijing/Hangzhou) University of Chinese Academy of Sciences Lanzhou center for theoretical physics Key Laboratory of Theoretical Physics of Gansu Province Key Laboratory of Quantum Theory and Applications of MoE Lanzhou University Institute of theoretical physics & Research center of Gravitation Lanzhou University International Centre for theoretical physics Asia-Pacific (ICTP-AP) University of Chinese Academy of Sciences (UCAS) center for Gravitational Wave Experiment National Microgravity Laboratory Institute of Mechanics Chinese Academy of Sciences

One of the primary goals of space-borne gravitational wave detectors is to detect and analyze extreme-mass-ratio inspirals(EMRIs). This task is particularly challenging because EMRI signals are complex, lengthy, and faint. In this work, we introduce a2-layer convolutional neural network(CNN) approach to detect EMRI signals for space-borne detectors, achieving a true positive rate(TPR) of 96.9% at a 1% false positive rate(FPR) for signal-to-noise ratio(SNR) from 50 to 100. Especially, the key intrinsic parameters of EMRIs such as the mass, spin of the supermassive black hole(SMBH) and the initial eccentricity of the orbit can also be inferred directly by employing a neural network. The mass and spin of the SMBH can be determined at 99% and 92% respectively. This will greatly reduce the parameter spaces and computing cost for the following Bayesian parameter *** model also has a low dependency on the accuracy of the waveform model. This study underscores the potential of deep learning methods in EMRI data analysis, enabling the rapid detection of EMRI signals and efficient parameter estimation.

关键词：