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浏览/检索结果: 共57条，第1-10条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序提交时间升序提交时间降序作者升序作者降序发表日期升序发表日期降序 Trust-region versus line search globalization strategies for inexact Newton method and application in full waveform inversion 期刊论文  OAI收割 JOURNAL OF APPLIED GEOPHYSICS, 2022, 卷号: 201, 页码: 17 作者:  He, Qinglong;  Wang, Yanfei   |  收藏  |  浏览/下载：34/0  |  提交时间：2022/07/18 Full waveform inversion  Inverse problems  Inexact Newton method  Trust-region  Line search  Adjoint-state method   A NEW ADAPTIVE SUBSPACE MINIMIZATION THREE-TERM CONJUGATE GRADIENT ALGORITHM FOR UNCONSTRAINED OPTIMIZATION 期刊论文  OAI收割 JOURNAL OF COMPUTATIONAL MATHEMATICS, 2021, 卷号: 39, 期号: 2, 页码: 159-177 作者:  Zhang, Keke;  Liu, Hongwei;  Liu, Zexian   |  收藏  |  浏览/下载：33/0  |  提交时间：2021/01/14 Conjugate gradient method  Nonmonotone line search  Subspace minimization  Sufficient descent condition  Global convergence   Exact line search method for using the L1-norm misfit function in full waveform inversion 期刊论文  OAI收割 STUDIA GEOPHYSICA ET GEODAETICA, 2020, 页码: 21 作者:  Ma, Xiaona;  Liang, Guanghe;  Xu, Shanhui;  Li, Zhiyuan;  Feng, Haixin   |  收藏  |  浏览/下载：26/0  |  提交时间：2021/01/08 full waveform inversion  L1 misfit function  exact line search method   New subspace minimization conjugate gradient methods based on regularization model for unconstrained optimization 期刊论文  OAI收割 NUMERICAL ALGORITHMS, 2020, 页码: 34 作者:  Zhao, Ting;  Liu, Hongwei;  Liu, Zexian   |  收藏  |  浏览/下载：26/0  |  提交时间：2021/01/14 Conjugate gradient method  p-regularization model  Subspace technique  Nonmonotone line search  Unconstrained optimization   Constraining the X-Ray-Infrared Spectral Index of Second-timescale Flares from SGR 1935+2154 with Palomar Gattini-IR 期刊论文  OAI收割 The Astrophysical Journal, 2020, 卷号: 901, 页码: L7 作者:  HXMT   |  收藏  |  浏览/下载：22/0  |  提交时间：2022/02/08 Radio transient sources  Magnetars  Soft gamma-ray repeaters  2008  992  1471  Astrophysics - High Energy Astrophysical Phenomena  Astrophysics - Instrumentation and Methods for Astrophysics  Abstract: The Galactic magnetar SGR 1935+2154 has been reported to produce the first example of a bright millisecond-duration radio burst (FRB 200428) similar to the cosmological population of fast radio bursts (FRBs). The detection of a coincident bright X-ray burst represents the first observed multiwavelength counterpart of an FRB. However, the search for similar emission at optical wavelengths has been hampered by the high inferred extinction on the line of sight. Here, we present results from the first search for second-timescale emission from the source at near-infrared (NIR) wavelengths using the Palomar Gattini-IR observing system in the J band, enabled by a novel detector readout mode that allows short exposure times of ?0.84 s with 99.9% observing efficiency. With a total observing time of ?12 hr (?47,728 images) during its 2020 outburst, we place median 3Ҡlimits on the second-timescale NIR fluence of ?18 Jy ms (13.1 AB mag). The corresponding extinction-corrected limit is ?125 Jy ms for an estimated extinction of AJ = 2.0 mag. Our observations were sensitive enough to easily detect an NIR counterpart of FRB 200428 if the NIR emission falls on the same power law as observed across its radio to X-ray spectrum. We report nondetection limits from epochs of four simultaneous X-ray bursts detected by the Insight-HXMT and NuSTAR telescopes during our observations. These limits provide the most stringent constraints to date on fluence of flares at 1014 Hz, and constrain the fluence ratio of the NIR emission to coincident X-ray bursts to RNIR ? 0.025 (fluence index ?0.35).   Research of step-length estimation methods for full waveform inversion in time domain 期刊论文  OAI收割 EXPLORATION GEOPHYSICS, 2019, 页码: 17 作者:  Ma, Xiaona;  Li, Zhiyuan;  Ke, Pei;  Xu, Shanhui;  Liang, Guanghe   |  收藏  |  浏览/下载：69/0  |  提交时间：2019/11/14 Full waveform inversion  step-length estimation method  exact line-search method  inexact line-search method  step-length initial-guess method   A New DY Conjugate Gradient Method and Applications to Image Denoising 期刊论文  OAI收割 IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS, 2018, 卷号: E101D, 期号: 12, 页码: 2984-2990 作者:  Xue, Wei;  Ren, Junhong;  Zheng, Xiao;  Liu, Zhi;  Liang, Yueyong   |  收藏  |  浏览/下载：94/0  |  提交时间：2019/07/12 unconstrained optimization  conjugate gradient method  line search  image denoising   A nonmonotone inexact Newton method for unconstrained optimization 期刊论文  OAI收割 OPTIMIZATION LETTERS, 2017, 卷号: 11, 期号: 5, 页码: 947-965 作者:  Gao, Huan;  Zhang, Hai-Bin;  Li, Zhi-Bao;  Tadjouddine, Emmanuel   |  收藏  |  浏览/下载：29/0  |  提交时间：2018/07/30 Inexact Newton method  Nonmonotone line search  Preconditioned conjugate gradient  Global convergence   A cascaded method for text detection in natural scene images 期刊论文  OAI收割 Neurocomputing, 2017, 卷号: 238, 期号: 238, 页码: 307-315 作者:  Yang, Zheng;  Qing, Li;  Jie, Liu;  Heping, Liu;  Gen, Li   |  收藏  |  浏览/下载：16/0  |  提交时间：2019/10/09 Extremal Regions  Recursive Local Search  Text Line Entropy  Convolutional Neural Network   A cascaded method for text detection in natural scene images 期刊论文  OAI收割 NEUROCOMPUTING, 2017, 卷号: 238, 期号: 238, 页码: 307-315 作者:  Zheng, Yang;  Li, Qing;  Liu, Jie;  Liu, Heping;  Li, Gen   |  收藏  |  浏览/下载：37/0  |  提交时间：2017/07/18 Extremal Regions  Recursive Local Search  Text Line Entropy  Convolutional Neural Network