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A rectangular thin plate vibration model subjected to inplane stochastic excitation is simplified to a quasinonintegrable Hamiltonian system with two degrees of freedom. Subsequently a one-dimensional Ito? stochastic differential equation for the system is obtained by applying the stochastic averaging method for quasi-nonintegrable Hamiltonian systems. The conditional reliability function and conditional probability density are both gained by solving the backward Kolmogorov equation numerically. Finally, a stochastic optimal control model is proposed and solved. The numerical results show the effectiveness of this method. 相似文献
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生态伦理学理论视野中的蒙古族生态文化 总被引：2，自引：0，他引：2
生态伦理学的核心思想为敬畏生命，尊重自然，和谐共存。蒙古族生态化的精神层面是指在与环境相互适应的物质生产、生活技能与知识的基础上产生的对生命的认识，对自然界的认识及对人与自然关系的认识；在这一框架内，上述生态伦理学的核心思想体现于萨满教曲折隐晦的表达中，体现于民间学情感化的表达中。 相似文献
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新时期、新形势发展的外在需求,使得高校思政教学工作必须走与时俱进、不断创新之路。作者通过对高校思政教学工作现状的剖析,提出了四种课堂教学模式创新的方法。 相似文献
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葛根义 《宿州教育学院学报》2004,7(2):98-99
语文开放题型是新时代下应运而生的极具时代特色的考试新题型,它对传统的教学内容,课堂结构,练习设计产生的冲击极大。本文拟就这一题型的时代意义以及如何应对这一题型谈些浅见。 相似文献
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人口因素是牧区发展的新支撑要素,牧区有可以开发利用的丰富的人力资源,新牧区建设应该重视解决人口发展问题。内蒙古牧区人口问题是多元、复杂的,牧区人口质量较低,其消极影响日益显著,牧民家庭致贫过程复杂化,人口结构不合理阻碍牧区人地关系协调,牧区人口流动缺乏积极的、多样化的政策支持。牧区人口发展应实施以提高人口素质为主、控制人口增长为辅的质、量兼顾发展战略,以促进人口非农化为主、人口适度迁移为辅的人地关系调整战略,人口脱困与生态可持续发展并重兼顾、相互促进的可持续发展战略。 相似文献
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A rectangular thin plate vibration model subjected to inplane stochastic excitation is simplified to a quasinonintegrable Hamiltonian system with two degrees of freedom. Subsequently a one-dimensional Ito stochastic differential equation for the system is obtained by applying the stochastic averaging method for quasi-nonintegrable Hamiltonian systems. The conditional reliability function and conditional probability density are both gained by solving the backward Kolmogorov equation numerically. Finally, a ... 相似文献
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Stochastic Bifurcation of Rectangular Thin Plate Vibration System Subjected to Axial Inplane Gaussian White Noise Excitation 总被引：1，自引：1，他引：0
A stochastic nonlinear dynamical model is proposed to describe the vibration of rectangular thin plate under axial inplane excitation considering the influence of random environment factors. Firstly, the model is simplified by applying the stochastic averaging method of quasi-nonintegrable Hamilton system. Secondly, the methods of Lyapunov exponent and boundary classification associated with diffusion process are utilized to analyze the stochastic stability of the trivial solution of the system. Thirdly, the stochastic Hopf bifurcation of the vibration model is explored according to the qualitative changes in stationary probability density of system response, showing that the stochastic Hopf bifurcation occurs at two critical parametric values. Finally, some explanations are given in a simple way on the potential applications of stochastic stability and bifurcation analysis. 相似文献
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葛根贵 《江西师范大学学报(哲学社会科学版)》1982,(2)
“其”,是《诗经》中用得最多、用法最复杂的虚词之一。前人为它作的训释也很多,裴学海《古书虚字集释》就搜集了十六条(未见于《诗》的用法不计在内)。然综观全《诗》,条分缕析,别异求同,“其”的主要用法不外乎三种:指代词,结构助词,语气词。作为指代词,“其”的指代范围较广。一般说来,只要是处于说话人与听话人之外的第三者地位,人、物、事都可以用“其”指代。“其”在句中经常处于表领属的地位,充当定语。如 相似文献
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葛根 《读与写:教育教学刊》2015,(6)
美术教育通过对美的感受,进化为对美与丑的分辨能力,潜移默化地使人的精神在愉悦和操作中得到升华,在学校教育中,它可以起到帮助学生树立正确的人生观的作用。 相似文献
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