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随机Langevin方程分裂AVF格式数值解的密度函数（洪佳林）
随机Langevin方程 分裂AVF格式 数值解 密度函数
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2023/2/22
In this article, we study the density function of the numerical solution of the splitting averaged vector field (AVF) scheme for the stochastic Langevin equation. We first show the existence of the de...
桌面式激光驱动冲击波技术及其在含能材料分子反应机制研究中的应用
桌面式激光驱动冲击波技术 含能材料 冲击反应 RDX
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2018/6/5
利用小型化桌面式脉冲激光驱动冲击波可实现材料的快速动态加载,具有成本低、实验重复频率高、加载速率超高等特点。介绍了桌面式激光驱动冲击技术的研究工作,以及该技术在含能材料冲击点火分子反应机制研究中的应用。目前已搭建的纳秒激光驱动冲击波实验系统可以实现上升时间仅为几纳秒、峰值压力不小于2 GPa的超快动态加载,并发展了相应的冲击特性表征技术。利用该实验系统,研究了典型含能材料RDX的冲击感度,发现冲击...
采用自洽平均场理论并结合蒙特卡洛方法考查不同溶剂中高分子单链回转半径与聚合度的标度关系。计算结果表明，在Θ溶剂中标度指数ν≈0.495，说明此时高分子链遵循理想链的行为；另一方面，在良溶剂中标度指数ν并非普适常数，而是随着溶剂性质的变化而改变，并且总是明显低于经典理论预测值0.6。分析指出，有限链长效应是造成这一偏差的重要原因。
Tight bounds for LDPC and LDGM codes under MAP decoding
Conditional entropy Low Density Parity Check Codes Maximum A Posteriori probability decoding Spin glasses Statistical physics
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2015/8/21
A new method for analyzing low density parity check (LDPC) codes and low density generator matrix (LDGM) codes under bit maximum a posteriori probability (MAP) decoding is introduced. The method is ba...
Approximate analysis of search algorithms with “physical” methods
Statistical physics analysis of algorithms stochastic input the physical concept
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2015/8/20
An overview of some methods of statistical physics applied to the analysis of algorithms for optimization problems (satisfiability of Boolean constraints, vertex cover of graphs, decoding, ...) with d...
What can we see from Investment Simulation based on Generalized (m,2)-Zipf law?
eneralized Zipf law time series fluctuations investment
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2015/8/5
The paper revisits the investment simulation based on strategies exhibited by Generalized (m,2)-Zipf law to present an interesting characterization of the wildness in financial time series. The invest...
A Neural Network based Background Supression Technique applied to VHE Gamma Ray Data coming from the Crab Pulsar
Imaging Atmospheric Cherenkov Technique Flux Upper Limit
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2014/12/12
In this thesis we present new results for the 99.9% confidence level flux upper limits on the pulsed VHE gamma ray signal coming from the Crab pulsar. In order to achieve optimum hadronic background s...
Kernel based unfolding of data obtained from detectors with finite resolution and limited acceptance
unfolding kernel apparatusfunction inverseproblem regularization
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2012/11/23
A kernel based procedure for correcting experimental data for distortions due to the finite resolution and limited detector acceptance is presented. The unfolding problem is known to be an ill-posed p...
Local Warming
temperatures Local Warming seasonal variations the 11-year solar cycle and a linear trend.
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2012/11/23
Using 55 years of daily average temperatures from a local weather station, I made a least-absolute-deviations (LAD) regression model that accounts for three effects: seasonal variations, the 11-year s...
Reconstructing Structured Sparse Signals from Compressive Samples via a Max-Product EM Algorithm
Belief propagation expectation maximization (EM) algorithm hidden Markovtree(HMT) max-productalgo-rithm,structured sparsity,sparse signal reconstruction.
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2012/11/22
We propose a Bayesian expectation-maximization (EM) algorithm for reconstructing structured approximately sparse signals via belief propagation. The measurements follow an underdetermined linear model...
Spatiotemporal correlations of handset-based service usages
Spatiotemporal correlations handset-based service usages Physics and Society
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2012/4/20
We study spatiotemporal correlations and temporal inhomogeneities of handset-based service usages by analyzing a dataset collected from 124 users for over 16 months. The dataset consists of detailed i...
Atomic structure of a single large biomolecule from diffraction patterns of random orientations
X-ray free electron lasers Single particle x-ray diffraction Orientation Structure reconstruction
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2012/4/20
The short and intense pulses of the new X-ray free electron lasers, now operational or under construction, may make possible diffraction experiments on single molecule-sized objects with high resoluti...
Structural Analysis of Laplacian Spectral Properties with Application to Electric Transmission Networks
Laplacian Spectral Properties Electric Transmission Networks Optimization and Control
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2011/8/18
Abstract: The spectrum of the Laplacian matrix of a network plays a key role in a wide range of dynamical problems associated with the network, from transient stability analysis of power networks to d...
Empirical analysis of collective human behavior for extraordinary events in blogosphere
Empirical analysis collective human behavior extraordinary events blogosphere
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2011/8/11
Abstract: To explain collective human behavior in blogosphere, we survey more than 1.8 billion entries and observe statistical properties of word appearance. We first estimate the basic properties of ...
Mandelbrot Law of Evolving Networks
Mandelbrot Law Evolving Networks Degree distributions power-law exponent
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2011/8/11
Abstract: Degree distributions of many real networks are known to follow the Mandelbrot law, which can be considered as an extension of the power law that determined by not only the power-law exponent...