非线性n阶微分方程多点边值问题     

姜波  刘颖 《沈阳教育学院学报》2003,5(4):99-102

用上、下解方法研究了n阶非线性微分方程k点边值问题y(n)=f(t,y(n-2),y(n-1))y(i)(di)=ai(i=0,1,…,n-3),g(y(n-2)(t1),y(n-1)(t1))=0,h(y(n-2)(tk),y(n-1)(tk))=0(1)　　　解的存在性、唯一性。其中tj∈R,j=1,2,…,k;t1相似文献   

会计工作与建设和谐社会     

彭郁 《合肥教育学院学报》2006,23(3):153-155

建设和谐社会需要会计工作的重心从财务会计转向管理会计，发挥反映、监督和参与决策职能的作用。结合会计工作的基本特征，分析如何在建设和谐社会的进程中改进和提高会计工作的质量。  相似文献   

“材料力学”水平冲击问题的教学思考     

李凯  赵新波  姚文莉  纪彩虹 《教育教学论坛》2020,(20):290-292

在课堂教学中发现,学生难以理解在被冲击物的水平方向上施加冲击物的重力来计算动荷因数。本文研究了不同水平静荷载的施加对冲击问题的影响,推导出水平冲击问题求解的通用公式,证明水平冲击问题与静荷载的施加方式及大小无关。若采用动荷因数法,需选择冲击物自身重力作为被冲击物的水平静载,才可得到教材中的结果。结合国外材料力学教材,介绍了水平冲击问题的另一种求解方法,拓宽了读者求解水平冲击的思路,并给出相应的教学建议。  相似文献   

煤岩冲击倾向性试验及分析   总被引：1，自引：0，他引：1  

陈绍杰  杨永杰  郭惟嘉 《实验室研究与探索》2007,(11)

利用MTS的特点和优势,对山东某矿现采煤层进行了煤岩冲击倾向性试验研究,通过对冲击能量指数、弹性能量指数和动态破坏时间三个煤层冲击能量指标的试验和分析,得出煤层具有较弱的冲击倾向;结合实际采矿条件,应加强冲击地压的预测预报,以保证矿井的安全生产。  相似文献   

Premiere在音乐电子相册上的开发与应用     

张伟 《教育教学论坛》2019,(21):270-272

本文介绍了应用多媒体音视频制作软件Premiere pro cc制作出大家喜爱的音乐电子相册的过程。从剖析制作思路,到根据音频进行分镜头拆分,再到运用Premiere技术达到音频与视频同步的效果。完整地呈现了应用Premiere技术开发制作音乐电子相册的方法。  相似文献   

几种环绕立体声系统性能分析     

杨军 《贵州教育学院学报》2003,14(4):54-56

介绍多种立体声系统的原理，对其效果进行了分析和比较。  相似文献   

Introduction to this Special Issue     

Lina?KashyapEmail author 《International journal for the advancement of counseling》2004,26(4):337-339

In 2001, for the first time in the history of the International Association for Counselling, International Conference was held in a developing Asian country–India, with the theme Families in Transition–Counselling in Transition–Meeting the Challenges Ahead. This special issue contains some of the presentations made by Indian participants during this conference which best reflect the challenges and diversities of counseling efforts with families in India. The first article was specially written for this issue in order to give an international relationship of this journal an in depth contextual understanding of Indian families in transition and the challenges they pose to the contemporary Indian counselor. Two articles are reflected to counseling families affected by socio-politial and economic changes. Five authors have written on counseling related to physical and mental disability/addiction and last two articles are reflected to authors experiences as family counselors.  相似文献   

一类非线性连续奇异系统降维观测器的设计     

陆国平  郭军亮  宫俊 《南通职业大学学报》2007,21(2):66-69,91

讨论了一类非线性时间连续奇异系统观测器的设计问题,通过线性矩阵不等式,给出了一种易于计算的降维观测器的设计方法;仿真数值例子表明了所给设计方法的有效性。  相似文献   

二阶非线性微分方程的非振动准则     

程崇高  袁明豪 《黄冈师范学院学报》2005,25(3):1-2,6

证明了一个微分恒等式，利用它得到了二阶非线性微分方程的一个充要条件，改进了已知的非振动性结果．  相似文献   

Equivalent Kelvin Impact Model for Seismic Pounding Analysis of Bridges     

DING Yang  YUE Fuqing  LI Zhongxian 《天津大学学报(英文版)》2006,12(Z1)

Based on Hertz contact theory, a method to determine the parameters of Kelvin impact model for seismic pounding analysis of bridges is proposed. The impact stiffness of Kelvin model is determined by the ratio of maximum impact force to maximum contact deformation, which is calculated based on Hertz contact theory with considering the vibration effect. The restitution coefficient which has great influence on the damping coefficient of Kelvin impact model is investigated by numerical analysis. Numerical results indicate that the impact stiffness of Kelvin impact model increases with the increment of the Hertz contact stiffness, approaching velocity or the length ratio of short to long girders. Vibration effect has remarkable influence on the impact stiffness and cannot be neglected. The restitution coefficient decreases when approaching velocity increases or the length ratio of short girder to long girder decreasing. The practical ranges of impact stiffness and restitution coefficient are obtained as 3×108-6×108 N/m and 0.6-0.95 respectively.  相似文献