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MODIFIED PARALLEL ROSENBROCK METHODS FOR STIFF DIFFERENTIAL EQUATIONS

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Journal of Computational Mathematics 2002年第1期20卷 23-34页

作者： Xue-nian Cao Shou-fu Li de-gui liu Institute for Computational and Applied Mathematics Xiangtan UniversityXiangtan 411105China Beijing Institute of Computer Application and Simulation Technology Beijing 100854China

Presents a class of modified parallel Rosenbrock methods (MPROW) which possesses more free parameters to improve further the various properties of the methods and will be similarly written as MPROW. Information on par... 详细信息

关键词： numerical analysis stiff ordinary differential equations Rosenbrock methods parallel algorithms

A CLASS OF TWO-STEP CONTINUITY RUNGE-KUTTA METHODS FOR SOLVING SINGULAR deLAY DIFFERENTIAL EQUATIONS AND ITS STABILITY ANALYSIS

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Journal of Computational Mathematics 2005年第6期23卷 647-656页

作者： Xin Leng de-gui liu Xiao-qiu Song Li-rong Chen Beijing Institute of Computer Application and Simulation Technology 100854 China Beijing Institute of Applied Physics and Computational Mathematics 100088 China

In this paper, a class of two-step continuity Runge-Kutta（TSCRK） methods for solving singular delay differential equations（Ddes） is presented. Analysis of numerical stability of this methods is given. We consider the two distinct cases：（i）τ≥ h, （ii）τ 〈 h, where the delay τ and step size h of the two-step continuity Runge-Kutta methods are both constant. The absolute stability regions of some methods are plotted and numerical examples show the efficiency of the method.

关键词： Analysis of numerical stability Singular delay differential equations Two-step continuity Runge-Kutta methods

PARALLEL ROSENBROCK METHODS FOR SOLVING STIFF SYSTEMS IN REAL-TIME SIMULATION

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Journal of Computational Mathematics 2000年第4期18卷 375-386页

作者： Li-rong Chen de-gui liu (Beijing institute of Computer Application and Simulation Technology, Beijing 100854, China) 北京计算机应用与仿真技术所北京 100854

In this paper parallel Rosenbrock methods in real-time simulation are presented on parallel computers. Their construction, their convergence and their numerical stability are studied, and the numerical simulation expe... 详细信息

关键词： Rosenbrock methods stiff system real-time simulation parallel algorithms

A　prospective　study　of　vertical　transmission　of　hepatitis　C　virus

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World Journal of Gastroenterology 1997年第2期3卷 54-56页

作者： SUN de gui 1, liu Cai Yun 1, MENG Zong Da 2, SUN Yong de 2, WANG Shu Cong 1, YANG Yu Qi 1, LIANG Zheng Lun 3 and ZHUANG Hui 3

ＡｐｒｏｓｐｅｃｔｉｖｅｓｔｕｄｙｏｆｖｅｒｔｉｃａｌｔｒａｎｓｍｉｓｓｉｏｎｏｆｈｅｐａｔｉｔｉｓＣｖｉｒｕｓＳＵＮＤｅＧｕｉ１，ＬＩＵＣａｉＹｕｎ１，ＭＥＮＧＺｏｎｇＤａ２，ＳＵＮＹｏｎｇＤｅ２，ＷＡＮ... 详细信息

ＡｐｒｏｓｐｅｃｔｉｖｅｓｔｕｄｙｏｆｖｅｒｔｉｃａｌｔｒａｎｓｍｉｓｓｉｏｎｏｆｈｅｐａｔｉｔｉｓＣｖｉｒｕｓＳＵＮＤｅＧｕｉ１，ＬＩＵＣａｉＹｕｎ１，ＭＥＮＧＺｏｎｇＤａ２，ＳＵＮＹｏｎｇＤｅ２，ＷＡＮＧＳｈｕＣｏｎｇ１，ＹＡＮＧＹｕ...

关键词： hepatitis C virus RNA, viral disease transmission, vertical

维吾尔族和汉族大学生的族际友谊与面孔识别跨民族效应的关系

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中国心理卫生杂志 2017年第5期31卷 406-411页

作者：刘阳贾德梅刘贵雄龙长权新疆师范大学教育科学学院心智发展与学习重点实验室乌鲁木齐830054 西南大学心理学部重庆400715

目的:考察维吾尔族(简称维)和汉族(简称汉)人口比例不同地区,维汉大学生的异族友谊经验与面孔识别跨民族效应的关系。方法:按照人口统计学标准选取维汉比例为1∶9地区汉族大学生33人(与维吾尔族低接触组),维汉比例为9∶1地区维吾尔族大... 详细信息

目的:考察维吾尔族(简称维)和汉族(简称汉)人口比例不同地区,维汉大学生的异族友谊经验与面孔识别跨民族效应的关系。方法:按照人口统计学标准选取维汉比例为1∶9地区汉族大学生33人(与维吾尔族低接触组),维汉比例为9∶1地区维吾尔族大学生32人(与汉族低接触组),以及维汉比例4∶6地区维吾尔大学生32人(与汉族高接触组)和汉族大学生34人(与维吾尔族高接触组),利用E-prime程序编程让被试执行"学习-再认"范式以考察识别本族和异族面孔(汉面孔/维面孔)的能力,采用自我报告的异族友谊卷入时间和自我表露程度考察异族友谊水平。结果:与汉族高、低接触组对本族面孔的再认正确率、鉴别力均高于对异族面孔的判断,而虚报率低于对异族面孔的判断(均P0.05)。逐步回归分析显示,与异族朋友相处的时间和族际友谊亲密度对跨民族效应幅度负向关联(β=-0.87、-0.56,均P<0.01)。结论:维吾尔族和汉族大学生在再认维汉面孔时采用不同的编码策略,族际友谊水平是预测维汉大学生面孔识别跨民族效应的有效指标。

关键词：跨民族效应群际关系群际友谊

Experimental Precision and Variety Comparison Precision in Regional Crop Trials

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Agricultural Sciences in China 2002年第2期1卷 149-154页

作者： KONG Fan-ling, ZHANG Qun-yuan, GE Zhi-nan YANG Fu-xin, ZHANG de-gui and liu Wen-xin( College of Crop Sciences , China Agricultural University , Beijing 100094 Institute of Economic Crops , Academy of Agricultural Sciences of Jiangsu Province, Nanjing 210014 Institute of Cotton , Chinese Academy of AgriculturalSciences , Anyang 455112) College of Crop Sciences China Agricultural University Beijing 100094 Institute of Economic Crops Academy of Agricultural Sciences of Jiangsu Province Nanjing 210014 Institute of Cotton Chinese Academy of Agricultural Sciences Anyang 455112

According to the basic concepts of precision and the principles of analysis of variance (ANOVA), precision types for experiments and variety comparison in regional crop trials (RCT) were studied and developed; expected variety comparison precision (EVCP) and realized variety comparison precision (RVCP) and the corresponding statistical indexes of them were proposed. It was explained that experimental precision (EP) and variety comparison precision (VCP) are two kinds of precision of RCT; EP includes error precision and variety mean precision, which can be measured respectively by the coefficient of variation of single observation's error (CVe) and the coefficient of variation of variety mean's error (CVy); VCP includes EVCP and RVCP, which can be measured respectively by the detectable least relative difference (DLRD) and the relative least significant distance (RLSD); EP is an important factor of VCP but not identical to it; RVCP is the realization of EVCP. Besides error, experimental design and GE interaction and ANOVA model affect VCP. Several application examples for these precision indexes were presented, and the precision of regional cotton trials in the Yellow River Valley and the Changjiang Valley were investigated through the historical data of RCTs from 1980 to 1999.

关键词： Regional trial Experimental precision Variety comparison precision Cotton

Mechanism of high temperature oxidation of Inconel 625 superalloy with various solution and ageing heat treatment processes

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Transactions of Nonferrous Metals Society of China 2024年第11期34卷 3662-3676页

作者： Jiang-kun FAN Hong-ci YANG Pei-zhe ZHANG Jia-yu LI Zhan-jie JING Fu-long CHEN de-gui liu Bin TANG Hong-chao KOU Jin-shan LI State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China National&Local Joint Engineering Research Center for Precision Thermoforming Technology of Advanced Metal Materials Xi’an 710072China Chongqing Innovation Center Northwestern Polytechnical UniversityChongqing 401135China AVIC Manufacturing Technology Institute Beijing 100024China

The high-temperature oxidation behaviour of the Inconel 625 alloy at 950℃ was investigated after different ageing *** effect of heat treatment on the oxidation behaviour of the alloy was analysed by characterizing the structure and elemental distribution before and after *** results reveal that the two ageing treatments at 650℃ for 500 h and at 750℃ for 400 h both reduced the oxidation mass *** oxidation at 950℃,an outer Cr_(2)O_(3) layer and inner Al_(2)O_(3) are identified as the main oxidation ***,Nb_(2)O_(5) andδ(Ni_(3)Nb)phases precipitated after *** ageing treatments cause the rapid generation of a dense Cr_(2)O_(3) layer on the surface,which prevents the diffusion of oxygen into the matrix,reduce the Al_(2)O_(3) inward growth depth,and improve the oxidation resistance of the alloy.

关键词： Inconel 625 alloy ageing treatment oxidation behaviour oxidation film kinetics

Observation of acoustic hybrid topological phases induced by the p-d orbital interactions

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 132-139页

作者： Xiao Xiang Feng Gao Yu-gui Peng Peng Wu Zong-Lin Li Xue-Feng Zhu School of Physics and Innovation Institute Huazhong University of Science and Technology

In spinless systems,growing attention has recently been attracted to synthetic gauge fields,which redefine the fundamental crystal symmetries by utilizing the projective algebraic ***,synthetic gauge fields have been commonly investigated in single orbital systems,and explorations on hybrid orbitals remain elusive in ***,we report the experimental observation of hybrid topological phases induced by hybrid synthetic gauge flux,which is formed by the interaction between p and d orbitals embedded in acoustic *** breaking the translation symmetries of Lxand/or Ly,we unambiguously demonstrate the first-order M?bius edge states and higher-order corner *** work establishes a platform for seeking exotic topological phases induced by hybrid-orbitals interactions and initializing the framework of hybrid-orbitalsrelated topological *** applications can be anticipated in scenarios such as high-quality sensing and robust wave trapping due to the stepwise energy distribution of the hybrid topological phase.

关键词： topological insulator synthetic gauge field projective symmetry corner states

Traffic safety helmet wear detection based on improved YOLOv5 network

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Optoelectronics Letters 2025年第1期21卷 35-42页

作者： gui Dongdong SUN Bo College of Software Southeast University Quanzhou Equipment Research Centre Haixi Institute Chinese Academy of Sciences

Aiming at the problem that the current traffic safety helmet detection model can't balance the accuracy of detection with the size of the model and the poor generalization of the model, a method based on improving you only look once version 5(YOLOv5) is proposed. By incorporating the lightweight Ghost Net module into the YOLOv5 backbone network, we effectively reduce the model size. The addition of the receptive fields block(RFB) module enhances feature extraction and improves the feature acquisition capability of the lightweight model. Subsequently, the high-performance lightweight convolution, GSConv, is integrated into the neck structure for further model size compression. Moreover, the baseline model's loss function is substituted with efficient insertion over union(EIoU), accelerating network convergence and enhancing detection precision. Experimental results corroborate the effectiveness of this improved algorithm in real-world traffic scenarios.

关键词： Traffic control