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On the Conditional Bounds for Siegel Zeros

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Acta Mathematica Sinica,English Series 2022年第5期38卷 869-876页

作者： Chao hua jia Institute of Mathematics Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190P.R.China hua Loo-Keng Key Laboratory of Mathematics Chinese Academy of SciencesBeijing 100190P.R.China School of Mathematical Sciences University of Chinese Academy of SciencesBeijng 100049P.R.China

In this paper,under a weakened version of Hardy–Littlewood Conjecture on the number of representations in Goldbach problem,we shall prove bounds for the Siegel zeros of real primitive Dirichlet characters for composi... 详细信息

关键词： Siegel zero Goldbach problem

NUMERICAL INVESTIGATION OF SEABED INTERACTION IN TIME DOMAIN ANALYSIS OF MOORING CABLES

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Journal of Hydrodynamics 2006年第4期18卷 424-430页

作者： YU Long TAN jia-hua School of Naval Architecture and Civil Engineering Shanghai Jiaotong University Shanghai 200030 China

In this paper, an efficient two-dimensional finite element model for numerical analysis of mooring cables and seabed interaction has been built. Geometric shape and dynamics of mooring cables are computed in time domain, accounting for the motions of the moored sturcture. In the model, a hybrid beam element is employed to simulate the mooring cable while the seabed is simulated by application of different soil constitutive models. After the elastic and elastic-plastic soil constitutive models have been used for computation, tensions and offsets of mooring cables at fairlead point are also compared accounting for friction effect between cables and seabed. Both transversal and longitudinal behaviors are studied at different water depths.

关键词： dynamics of mooring cable seabed interaction soil constitutive models

基于TCN-Bi-GRU和交叉注意Transformer的多模态情感识别

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陕西科技大学学报 2025年第1期43卷 161-168页

作者：李嘉华陈景霞白义民陕西科技大学电子信息与人工智能学院陕西西安710021

多模态语音情感识别是近年来在自然语言处理和机器学习领域备受关注的研究方向之一,不同模态的数据存在异构性和不一致性,将不同模态信息有效地融合起来并学习到高效的表示形式是一个挑战.为此,本文提出了一种新的基于时序信息建模和交... 详细信息

多模态语音情感识别是近年来在自然语言处理和机器学习领域备受关注的研究方向之一,不同模态的数据存在异构性和不一致性,将不同模态信息有效地融合起来并学习到高效的表示形式是一个挑战.为此,本文提出了一种新的基于时序信息建模和交叉注意力的多模态语音情感识别模型.首先采用时间卷积网络(Time Convolutional Network,TCN)提取语音、文本和视频数据的深层时序特征,使用双向门控递归单元(Bidirectional Gated Recurrent Unit,Bi-GRU)捕捉序列数据的上下文信息,提高模型对序列数据的理解能力.然后基于交叉注意力机制和Transformer构建多模态融合网络,用于挖掘并捕获音频、文本和视觉特征之间交互的情感信息.此外,在训练过程中引入弹性网络正则化(Elastic Net Regularization)防止模型过拟合,最后完成情感识别任务.在IEMOCAP数据集上,针对快乐、悲伤、愤怒和中性四类情感的分类实验中,准确率分别为87.6%、84.1%、87.5%、71.5%,F1值分别为85.1%、84.3%、87.4%、71.4%.加权平均精度为80.75%,未加权平均精度为82.80%.结果表明,所提方法实现了较好的分类性能.

关键词：语音识别多模态情感识别时间卷积网络交叉注意力机制弹性网络

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辽宁“六地”红色文化与高校思政课教学深度融合路径研究

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林区教学 2025年第1期 7-10页

作者：李萌李辉贾华大连海洋大学马克思主义学院大连海洋大学机械与动力工程学院

实现辽宁“六地”红色文化与高校思政课教学深度融合是落实高校立德树人根本任务和“大思政课”建设、大力弘扬辽宁“六地”红色文化的重要手段。在分析辽宁“六地”红色文化与高校思政课深度融合的重要意义和需要解决的问题基础上，从... 详细信息

实现辽宁“六地”红色文化与高校思政课教学深度融合是落实高校立德树人根本任务和“大思政课”建设、大力弘扬辽宁“六地”红色文化的重要手段。在分析辽宁“六地”红色文化与高校思政课深度融合的重要意义和需要解决的问题基础上，从营造传承发展红色文化的良好氛围、加强高校思政课教师队伍建设、理论教学与实践教学相结合以及建立和完善教学评价机制四个方面提出辽宁“六地”红色文化与高校思政课教学深度融合的实施路径。

关键词：辽宁“六地”红色文化高校思政课教学

Invariant Sets and Exact Solutions to Nonlinear Diffusion Equations with x-Dependent Convection and Absorption

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Communications in Theoretical Physics 2008年第10期50卷 821-826页

作者： jia hua-Bing XU Wei Department of Applied Mathematics Northwestern Polytechnical University Xi＇an 710072 China Department of Matheinatics Baoji University of Arts and Sciences Baoji 721013 China

In this paper, we introduce a new invariant set Eo={u：ux=f＇（x）F（u）＋ε[g＇（x）-f＇（x）g（x）]F（u）×exp（-∫^u1/F（z）dz）}where f and g are some smooth functions of x, ε is a constant, and F is a smooth function to be determined. The invariant sets and exact sohltions to nonlinear diffusion equation ut = （ D（u）ux）x ＋ Q（x, u）ux ＋ P（x, u）, are discussed. It is shown that there exist several classes of solutions to the equation that belong to the invariant set Eo.

关键词： invariant set exact solution nonlinear diffusion equations rotation group scaling group

Effects of Nb on microstructure and wear resistance of Fe-Cr-C-B surfacing alloy

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Journal of Iron and Steel Research International 2018年第2期25卷 243-251页

作者： jian Gou Zheng-jun Liu hua jia Department of Material Science and Engineering ShenyangUniversity of Technology Shenyang 110870 LiaoningChina

The influence of Nb on the microstructure and wear resistance of the surfacing layer was investigated by using the Fe-based flux-cored wire in the Fe-Cr-C-B system. The microstructure, microhardness and wear resistance properties of the samples were investigated by X-ray diffraction, scanning electron microscopy, microhardness testing and abrasive wear testing, respectively. The results indicate that microstructures of the alloy are composed of martensite, retained austenite, M23（C,B）6 and NbC. Boride M23（C,B）6 is distributed along the grain boundaries, while NbC in shape-regular quadrilateral is distributed in martensite. The microhardness is distributed from the substrate to the surfacing layer gradiently. NbC significantly improved the wear resistance of surfacing layer.

关键词： Flux-cored wire Surfacing layer Microhardness Microstructure Wear resistance

Exact Solutions and Invariant Sets to General Reaction-Diffusion Equation

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Communications in Theoretical Physics 2008年第6期49卷 1389-1392页

作者： jia hua-Bing XU Wei Department of Applied Mathematics Northwestern Polytechnical University Xi＇an 710072 China

In this paper, we introduce new invariant sets, and the invariant sets and exact solutions to general reactiondiffusion equation are discussed. It is shown that there exist a class of exact solutions to the equations ... 详细信息

关键词： invariant set exact solution general reaction-diffusion equation rotation group scaling group

An Optimal Control Problem of a Coupled Nonlinear Parabolic Population System

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Acta Mathematicae Applicatae Sinica 2007年第3期23卷 377-388页

作者： Chao-hua jia De-xing Feng Department of Applied Mathematics LMIB of the Ministry of Education Beijing University of Aeronauticsand Astronautics Beijing 100083 China Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100080 China

An optimal control problem for a coupled nonlinear parabolic population system is considered. The existence and uniqueness of the positive solution for the system is shown by the method of upper and lower solutions. An explicit prior bound of solutions to the system is given by considering an auxiliary coupled linear system. The existence of the optimal control is proved and the characterization of the optimal control is established.

关键词： Nonlinear parabolic systems optimal control upper and lower solutions

Alteration in Secondary Wall Deposition by Overexpression of the Fragile Fiber1 Kinesin-Like Protein in Arabidopsis

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Journal of Integrative Plant Biology 2007年第8期49卷 1235-1243页

作者： jianli Zhou jia Qiu Zheng-hua Ye Department of Plant Biology University of Georgia Athens Georgia 30602 USA

Secondary walls in fibers and vessels are typically deposited in three distinct layers, which are formed by the successive re-orientation of cellulose microfibrils. Although cortical microtubules have been implicated in this process, the underlying mechanisms for the formation of three distinct wall layers are not known. The Fragile Fiber1 （FRA1） kinesin-like protein has been previously shown to be involved in the oriented deposition of cellulose microfibrils and important for cell wall strength in Arabidopsis thaliana. In the present report, we investigated the expression pattern of the FRA 1 gene and studied the effects of FRA1 overexpression on secondary wall deposition. The FRAI gene was found to be expressed not only in cells undergoing secondary wall deposition including developing interfascicular fibers and xylem cells, but also in dividing cells and expanding/elongating parenchyma cells. Overexpression of FRA1 caused a severe reduction in the thickness of secondary walls in interfascicular fibers and deformation of vessels, which are accompanied with a marked decrease in stem strength. Close examination of secondary walls revealed that unlike the wild-type walls having three typical layers with the middle layer being the thickest, the secondary walls in FRA1 overexpressors exhibited an increased number of layers, all of which had a similar width. Together, these results provide further evidence implicating an important role of the FRA1 kinesin-like protein in the ordered deposition of secondary walls, which determines the strength of fibers and vessels.

关键词： Arabidopsis thaliana cellulose microfibrils kinesin-like protein secondary wall deposition.