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Solutions and Conditional Lie-Backlund Symmetries of Quasi-linear Diffusion-Reaction Equations

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Communications in Theoretical Physics 2009年第1期51卷 6-12页

作者： ZUO Su-Li QU chang-zheng Center for Nonlinear Studies Northwest University Xi＇an 710069 China Department of Mathematics Northwest University Xi＇an 710069 China

New classes of exact solutions of the quasi-linear diffusion-reaction equations are obtained by seeking for the high-order conditional Lie-Baeklund symmetries of the considered equations. The method used here extends the approaches of derivative-dependent functional separation of variables and the invariant subspace. Behavior to some solutions such as blow-up and quenching is also described.

关键词： conditional Lie-Backlund symmetry exact solution quasi-linear diffusion-reaction equation

Extended Group Foliation Method and Functional Separation of Variables to Nonlinear Wave Equations

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Communications in Theoretical Physics 2005年第4X期44卷 577-582页

作者： QU chang-zheng ZHANG Shun-Li Center for Nonlinear Studies Northwest University Xi'an 710069 China Department of Mathematics Northwest University Xi'an 710069 China

Generalized functional separation of variables to nonlinear evolution equations is studied in terms of the extended group foliation method, which is based on the Lie point symmetry method. The approach is applied to nonlinear wave equations with variable speed and external force. A complete classification for the wave equation which admits functional separable solutions is presented. Some known results can be recovered by this approach.

关键词： symmetry group group foliation method nonlinear wave equation functional separation of variables

Classification and Reduction of Generalized Thin Film Equations

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Communications in Theoretical Physics 2009年第9期52卷 403-410页

作者： ZHU Chun-Rong QU chang-zheng Center for Nonlinear Studies Northwest University Xi＇an 710069 China College of Mathematics and Computer Science Anhui Normal University Wuhu 241000 China Department of Mathematics Northwest University Xi＇an 710069 China

Classification and reduction of the generalized fourth-order nonlinear differential equations arising from theliquid films are *** is shown that these equations have solutions on subspaces of the polynomial,exponential ortrigonometric form defined by linear nth-order ordinary differential equations with constant coefficients for n=4,...,*** examples of exact solutions are presented.

关键词： thin film equation classification invariant subspaces exact solutions

Potential Symmetries to a System of Three-Component Nonlinear Diffusion Equations

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Communications in Theoretical Physics 2006年第2期45卷 193-198页

作者： XUE Chun-Rong QU chang-zheng Center for Nonlinear Studies Northwest University Xi＇an 710069 China Department of Mathematics Northwest University Xi＇an 710069 China

A system of nonlinear diffusion equations with three components is studied via the potential symmetry method. It is shown that the system admits the potential symmetries for certain diffusion terms. The invariant solu... 详细信息

关键词： Lie point symmetry potential symmetry nonlinear diffusion equation group-invariant solutions

Fatigue driving detection based on Haar feature and extreme learning machine

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The Journal of China Universities of Posts and Telecommunications 2016年第4期23卷 91-100页

作者： chang zheng Ban Xiaojuan Wang Yu School of Computer and Communication Engineering University of Science and Technology Beijing

As the significant branch of intelligent vehicle networking technology, the intelligent fatigue driving detection technology has been introduced into the paper in order to recognize the fatigue state of the vehicle driver and avoid the traffic accident. The disadvantages of the traditional fatigue driving detection method have been pointed out when we study on the traditional eye tracking technology and traditional artificial neural networks. On the basis of the image topological analysis technology, Haar like features and extreme learning machine algorithm, a new detection method of the intelligent fatigue driving has been proposed in the paper. Besides, the detailed algorithm and realization scheme of the intelligent fatigue driving detection have been put forward as well. Finally, by comparing the results of the simulation experiments, the new method has been verified to have a better robustness, efficiency and accuracy in monitoring and tracking the drivers＇ fatigue driving by using the human eye tracking technology.

关键词： Haar feature extreme learning machine fatigue driving detection

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基础激励下裂纹梁结构疲劳寿命预测模型

机械设计与制造 2024年第9期403卷 77-84页

作者：龙慧黄长征刘义伦李松柏韶关学院智能工程学院广东韶关512005 中南大学机电工程学院湖南长沙410083

为了发展基于模型的裂纹梁结构疲劳寿命预测方法,提出了一种新的三维裂纹梁单元刚度矩阵。基于该刚度矩阵,建立基础激励下裂纹梁结构的三维有限元模型。推导三维裂纹梁单元的应力强度因子,建立三维裂纹梁单元的疲劳裂纹扩展模型。采用... 详细信息

为了发展基于模型的裂纹梁结构疲劳寿命预测方法,提出了一种新的三维裂纹梁单元刚度矩阵。基于该刚度矩阵,建立基础激励下裂纹梁结构的三维有限元模型。推导三维裂纹梁单元的应力强度因子,建立三维裂纹梁单元的疲劳裂纹扩展模型。采用振动响应与裂纹扩展增量交互计算方法,计算循环载荷作用下裂纹梁结构的疲劳寿命。研究结果表明:裂纹梁结构寿命预测模型较好地体现了疲劳裂纹扩展寿命与基础激励参数、结构参数和裂纹参数之间的内在关系,反映了基础激励对裂纹梁结构疲劳寿命的影响。最后通过实验对模型进行了验证。

关键词：基础激励裂纹梁结构有限单元法疲劳寿命动力学模型裂纹扩展

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猪伪狂犬病诊断方法与疫苗研究进展

动物医学进展 2024年第2期45卷 95-100页

作者：何松汤德元毛茵茗周飘陈阊峥罗柳陈旭廖正波袁盛林贵州大学动物科学学院贵州贵阳550025

猪伪狂犬病病毒(Pseudorabies virus, PRV)可引起妊娠母猪繁殖障碍和新生仔猪神经症状,可感染人类并引起脑炎,使感染者出现严重的神经症状,直接危害人类健康,因此对该病的研究具有重大意义。近年该病在世界范围内广泛分布,对世界养猪业... 详细信息

猪伪狂犬病病毒(Pseudorabies virus, PRV)可引起妊娠母猪繁殖障碍和新生仔猪神经症状,可感染人类并引起脑炎,使感染者出现严重的神经症状,直接危害人类健康,因此对该病的研究具有重大意义。近年该病在世界范围内广泛分布,对世界养猪业造成了巨大的经济损失,受到国内外学者的高度关注,对该病的研究也日益深入,在诊断方法及防控机制等方面取得了重要进展。论文就近年来猪伪狂犬病诊断方法及疫苗的发展进行综述,以期为在猪伪狂犬病诊断方法和疫苗选择上提供参考。

关键词：猪伪狂犬病诊断方法疫苗

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微生物发酵法制备核酸酶P1及其性质和应用

中国调味品 2024年第10期49卷 216-220页

作者：胡洋万吉林侯莎吴昌正童星广东海天创新技术有限公司广东佛山528000 天典(广东)生物科技有限公司广东佛山528200 佛山市海天调味食品股份有限公司广东佛山528000

核酸酶P1又名5′-磷酸二酯酶,是酶法制备5′-核苷酸的关键酶类。文章对核酸酶P1的结构、性质、发酵工艺及其在食品领域的应用进行了总结,并对其未来的发展方向进行了展望。

关键词：核酸酶P1 性质发酵固定化应用

Vedolizumab in the treatment of immune checkpoint inhibitorinduced colitis:Two case reports

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World Journal of Clinical Cases 2022年第29期10卷 10550-10558页

作者： Zhe Zhang chang-Qing zheng The Second Department of Gastroenterology Shengjing Hospital of China Medical UniversityShenyang 110004Liaoning ProvinceChina

BACKGROUND Immune check-point inhibitors-induced colitis(ICPIs-induced colitis) is one of the immune-related side *** and Infliximab are commonly used to treat *** patients of our report were treated by *** SUMMARY The two patients went to the doctor with bloody stools and were treated by Sintilimab and Camrelizumab,respectively,for their malignant *** were diagnosed as ICPIs-induced colitis based on endoscopic and histologic *** original immunotherapy was ceased while the anti-inflammatory therapy was *** patients’ colitis symptoms disappeared after the treatment and no recurrence was found during the follow-up *** unique feature about the case reports is that Vedolizumab combined with short-term corticosteroids had achieved good therapeutic *** For the symptoms of bloody diarrhea after the ICPIs treatment of cancer,the possibility of ICPIs-induced colitis should be *** combined with short-term corticosteroids may be appropriate for the treatment.

关键词： Immunotherapy Colitis Vedolizumab Camrelizumab Sintilimab Case report