检索结果-南通市图书馆

Traveling wave solutions for a diffusive predator-prey model with predator saturation and competition

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2017年第6期10卷 231-253页

作者： Lin Zhu shi-Liang wu School of Mathematics and Statistics Xidian University Xi'an Shanxi 710071 P. R. China

The purpose of this paper is to study the traveling wave solutions of a diffusive predator- prey model with predator saturation and competition functional response. The system admits three equilibria： a zero equilibrium E0, a boundary equilibrium E1 and a posi- tive equilibrium E. under some conditions. We establish the existence of two types of traveling wave solutions which connect E0 and E. and E1 and E., respectively. Our main arguments are based on a simplified shooting method, a sandwich method and constructions of appropriate Lyapunov functions. Our particular interest is to investi- gate the oscillation of both types of traveling wave solutions when they approach the positive equilibrium.

关键词： Diffusive predator prey model traveling wave solution shooting argument Wazewski's set LaSalle's invariance principle.

Wave propagation of a discrete SIR epidemic model with a saturated incidence rate

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2019年第3期12卷 109-126页

作者： Qiu Zhang shi-Liang wu School of Mathematics and Statistics Xidian University Xi7an Shaanxi 710071 P. R. China

This paper is concerned with the traveling wave solutions for a discrete SIR epidemic model with a saturated incidence rate. We show that the existence and non-existence of the traveling wave solutions are determined by the basic reproduction number R0 of the corresponding ordinary differential system and the minimal wave speed c*. More specifically, we first prove the existence of the traveling wave solutions for R0>1 and c>c* via considering a truncated initial value problem and using the Schauder’s fixed point theorem. The existence of the traveling wave solutions with speed c=c? is then proved by using a limiting argument. The main difficulty is to show that the limit of a decreasing sequence of the traveling wave solutions with super-critical speeds is non-trivial. Finally, the non-existence of the traveling wave solutions for R0>1,00 is proved.

关键词： Lattice dynamic system traveling wave solution existence non-existence

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

投加铁粉对长泥龄污泥高温厌氧消化的影响

中国给水排水 2024年第5期40卷 87-92页

作者：寇晓梅王琳平彭俊吴世璋邵甜王怡中国电建集团西北勘测设计研究院有限公司陕西西安710065 西安建筑科技大学环境与市政工程学院陕西西安710055

探讨了投加还原性铁粉对长泥龄污泥高温[(52±1)℃]厌氧消化的影响。结果表明,投加适量的铁粉对污泥高温厌氧消化有促进作用,可降低挥发性脂肪酸(VFAs)的积累、提高最大产甲烷潜能和沼气中甲烷的含量、降低生物营养物去除(BNR)工艺污泥... 详细信息

探讨了投加还原性铁粉对长泥龄污泥高温[(52±1)℃]厌氧消化的影响。结果表明,投加适量的铁粉对污泥高温厌氧消化有促进作用,可降低挥发性脂肪酸(VFAs)的积累、提高最大产甲烷潜能和沼气中甲烷的含量、降低生物营养物去除(BNR)工艺污泥消化液中磷酸盐浓度。当铁粉投加量为10 g/L时,最高累积甲烷产量为258.80 L/kgVS,沼气中甲烷含量为74%,同时可降低消化液中58.33%的磷酸盐。

关键词：高温厌氧消化长泥龄污泥铁粉最大产甲烷潜能

Analysis of working behavior of Jinping-I Arch Dam during initial impoundment

在线全文

学校读者我要写书评

暂无评论

Water Science and Engineering 2016年第3期9卷 240-248页

作者： shi-yong wu Wei Cao Jiang Zheng Yalong River Hydropower Development Company Ltd.

To study the stress, deformation, and seepage pressure during the initial impoundment of the Jinping-I Arch Dam, monitoring analysis and numerical calculation were used in a dam behavior analysis that focused on the working behavior of the dam during the late period of the initial impoundment up to the end of November 2014. The numerical calculation was performed based on feedback analysis of the deformation and stress of the arch dam through inversion of the elastic moduli(E) of the dam body and foundation, using a three-dimensional finite element model for the linear elastic material of the arch dam. The main monitoring indices presented insignificant changes in the late period of the initial impoundment, and the results of feedback analysis were consistent with monitoring results. Analysis results also show that the deformations of the dam body and dam foundation were within the design range; the dam stress distributions were normal, with values lower than the design control criteria; and the seepage flows through the dam body and dam foundation were lower than the design drainage capacity of the deep-well pump house, demonstrating that the Jinping-I Arch Dam was in good working condition, and the initial impoundment had been successfully completed. The results of the working behavior analysis of the Jinping-I hydropower project during the initial impoundment can provide references for safe operation of similar projects.

关键词： Dam safety monitoring Working behavior Elastic modulus Dam impoundment Jinping-I hydropower project

在线全文

学校读者我要写书评

暂无评论

价值链视角下的全过程工程咨询业务流程再造

价值工程 2024年第22期43卷 151-154页

作者：张凌睿石振武东北林业大学土木与交通学院哈尔滨150040

价值链视角之下全过程工程咨询业务在实际实施过程中的核心,在于能够准确地发现工程项目建造过程中的内在关联,并建立在工程运行全过程的基础之上,为工程运行提供相应的咨询服务。文章在研究之中则建立在需求分析阶段、规划论证阶段、... 详细信息

价值链视角之下全过程工程咨询业务在实际实施过程中的核心,在于能够准确地发现工程项目建造过程中的内在关联,并建立在工程运行全过程的基础之上,为工程运行提供相应的咨询服务。文章在研究之中则建立在需求分析阶段、规划论证阶段、设计阶段、招投标采购阶段、施工与竣工及验收等几个阶段之上,从价值分析视角入手,明确工程咨询业务流程再造需要加强自身对于客户需求的准确性分析,对于项目实施核心要点的准确分析,注重采购咨询等方面的具体需求分析等方面的思路之上,进行具体的再造内容及流程的设计。希望本文的研究能够为后续工程咨询机构咨询业务的优化与改进提供一些针对性更强的意见与建议,进一步提升工程咨询机构的执业能力水平。

关键词：价值链全过程工程咨询咨询业务业务流程优化

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

基于深度语义匹配模型的智能客服系统设计

自动化技术与应用 2024年第7期43卷 176-180页

作者：吴石松董召杰南方电网数字电网研究院有限公司广东广州510000

为保证智能服务的及时性,最大程度提升用户对智能服务的满意度,设计基于深度语义匹配模型的智能客服系统。用户通过交互层智能终端发送服务请求,通过数据层分析请求内容并查询其历史请求记录;将分析结果和查询结果传输至功能层;同时利... 详细信息

为保证智能服务的及时性,最大程度提升用户对智能服务的满意度,设计基于深度语义匹配模型的智能客服系统。用户通过交互层智能终端发送服务请求,通过数据层分析请求内容并查询其历史请求记录;将分析结果和查询结果传输至功能层;同时利用卷积深度语义匹配模型完成语义增强和匹配,并生成应答对话,将应答结果呈现至交互层,实现服务的交互。测试结果表明:学习率的取值为0.4时,系统可在训练次数为300次时完成训练,损失值接近为0;能够依据用户发送的内容文本识别用户情绪,在实行情绪安抚的同时提供应答服务。

关键词：深度语义匹配模型智能客服系统语义增强系统设计

在线全文

学校读者我要写书评

暂无评论

红色基因融入高校日常思政教育工作路径研究

当代教研论丛 2024年第3期10卷 91-93页

作者：吴世翀杜真强哈尔滨学院黑龙江哈尔滨150080

红色基因是中国共产党在革命实践中实现自我进化,在社会主义建设和改革中实现自我净化的产物,是中国共产党先进思想的结晶,将红色基因融入大学生日常思政教育工作是对习近平总书记“用好红色资源,传承好红色基因,把红色江山世世代代传... 详细信息

红色基因是中国共产党在革命实践中实现自我进化,在社会主义建设和改革中实现自我净化的产物,是中国共产党先进思想的结晶,将红色基因融入大学生日常思政教育工作是对习近平总书记“用好红色资源,传承好红色基因,把红色江山世世代代传下去”的号召的落实与探索。文章主要从擦亮思政教师队伍的鲜红底色、用心打造高校课堂上的红色氛围、让红色基因在高校团学活动中接力传承、把红色基因融入大学生党员培养过程中每一个环节等四方面入手探究红色基因的传承,以期为高校日常思政工作的红色教育实践提供有效的方法借鉴。

关键词：红色基因思想政治高校教育

Simulating the Hadamard gate in the Fibonacci disk code for universal topological quantum computation

在线全文

学校读者我要写书评

暂无评论

The Innovation 2023年第6期4卷 9-10页

作者： Yong-shi wu Department of Physics and Astronomy University of UtahSalt Lake CityUT 84112USA

The 21st century is widely believed to be a century of information *** particular,of quantum information processing,including quantum communi-cation and quantum *** is well known that quantum states are generally fragile,in the sense that quantum coher ence and entanglement needed for information processing cannot be kept for a sufficiently long time due to un-avoidable noises and environmental ***,this problem may be overcome by exploring the so-called topological states of matter,whose physical properties,at least some of the main ones to be used,are robust against disorders and variations in *** emerged the research field of topological,or fault tolerant,quantum computation.

关键词： computation. quantum topological

Parametric Research of Experiments on a Carangiform Robotic Fish

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2008年第2期5卷 95-101页

作者： Qin Yan Zhen Han shi-wu Zhang Jie Yang Department of Precision Machinery and Precision Instrumentation University of Science and Technology of China Hefei 230026 P R. China

In this paper, a carangiform robotic fish with 4-DoF （degree of freedom） tail has been developed. The robotic fish has capability of swimming under two modes that are radio control and autonomous swimming. Experiments were conducted to investigate the influences of characteristic parameters including the frequency, the amplitude, the wave length, the phase difference and the coefficient on forward velocity. The experimental results shown that the swimming performance of the robotic fish is affected mostly by the characteristic parameters observed.

关键词： biomimetic robotic fish experimental parameter matrix undulation equation body length velocity