嵌入式网络系统设计原理

集成电路技术的不断进步使得将计算与通讯功能集成于监视或控制物理过程的器件成为可能。人们可以在汽车、家用电器、工厂、飞机、蜂窝式电话、电子游戏及环境监测系统中发现数字控制器。事实上，现在制造的绝大多数处理器被用于嵌入式应用，即与物理过程相连接，而不是人们原本认为的用于计算机。     

电视信号监测网络系统的原理与设计

现阶段以及今后几年,我国广电监测仅以各地监测台、站为主,无法对广播电视进行全方位的监视。为了满足市场的需要,我们结合当今先进的科学技术知识,提出了适合省级监测网的完整的电视信号监测网络系统方案。     

发现法在物理教学中的应用

一、布鲁纳和发现法教学本世纪五十年代下半期起,美国迫于苏联第一颗人造卫星发射成功的压力。在全美范围内掀起了课程教材改革的浪潮。围绕如何改革美国中小学的自然科学教育的问题,1959年,约35位科学家、学者、教育学家聚集在伍慈霍尔进行了讨论。在当时大会上,布鲁纳阐述了自己的教育思想:强调学科的基本结构的学习。他提出的依据⑴从心理学角度他认为所有知识均按编码系统排列组合的,学习就是编码系统的形成,这种有内在联系的知识使人能超越给定的信息,飞速前进;⑵懂得基本原理结构,使学科更易理解;⑶结构学习有助于学生的记忆;⑷领会基本结构或原理最易迁移,可使学生学会学习。     

The first-principles study on the doping effect of Re in Ni3Al

Using first-principles density function for molecules method （DMol） and discrete variational method （DVM） based on the density functional theory, we studied the doping effect of Re in Ni3Al. The structure relaxation and the alloying energy show that Re has a strong Al site preference and leads to the local deformation, which is in agreement with the experimental results and other theoretical results. In addition, the charge density difference and the bond order show that Re can strongly enhance the interatomic interaction between the nearest neighbor atoms. From the density of states and the Pauli spectrum, we find that resonance states and localized states are induced by doping Re, and the doped Re atom forms the hybridized bond with the nearest neighbor atoms.     

保费计算原理与破产概率

本文从经典带扰动破产概率开始,引入了调节系数和破产概率。选择收取不同的常数保费,其中包括方差原理、零效用原理、平均值原理等条件下求出调节系数方程,进而由lundberg方程,可以求出破产概率。最后列举了应用实例。     

反极大值比较原理和二阶Neumann边值问题解的唯一性

本文主要利用反极大值比较原理研究了带有Neumann边界条件的二阶微分方程解的唯一性条件。     

用大地电磁频谱测量法探测煤矿区陷落柱

根据大地电磁频谱测量法的基本原理和特点,确定了相关的探测区大地电阻率模型,校正系数,将所得频率的标定直接转换为探测深度的刻度.通过探测实例,说明了大地电磁谱测量法在煤矿区探测陷落柱和识别煤层等的应用效果和应用前景.     

推动电子文件归档工作的思考

"飘色"是一种融魔术、杂技、音乐、舞蹈于一体的古老民间艺术,在不同地区有抬阁、彩擎、高抬、彩架、扎故事等各种名称。表演者站在被称为"色柜"的小舞台上,以巡游的形式表现民间传说或神话故事的片段,其神奇之处就在于,演员们通过经过精心伪装的钢枝凌空而立,利用巧妙的力学原理,营造出"飘"的效果。     

MELSEC—K可编程控制器及其应用

介绍了日本三菱电气株式会社制造的 ＭＥＩＳＥＣ一Ｋ可编程控制器的基本结构原理及在工业控制上的应用。     

OPTIMAL MAINTENANCE AND REPLACEMENT OF EXTRACTION MACHINERY

This paper considers a problem of optimal preventive maintenance and replacement schedule of equipment devoted to extracting resources from known deposits. Typical examples are oil drills, mine shovels, etc. At most one replacement of the existing machinery by a new one is allowed. The problem is formulated as an optimal control problem subject to the state constraint that the remaining deposit at any given time is nonnegative. We show that the optimal preventive maintenance, production rates, and the replacement and salvage times of the existing machinery and the new one, if required, can be obtained by solving sequentially a series of free-end-point optimal control problems. Moreover, an algorithm based on this result is developed and used to solve two illustrative examples.