基于单片机的艺术彩灯系统设计

本文设计了一种新型的艺术彩灯控制系统,该系统使用单片机作为控制核心,采用了PWM脉宽调制技术。在系统硬件电路中增加了过零检测,利用三极管电路控制彩灯颜色的变化和组合。改进了传统艺术彩灯制作工艺要求严格,色彩变化单一的缺点。通过实验,该系统运行稳定,易于扩展。     

景观照明配套电气设计

功能多样、技术先进的城市景观照明越来越受到城市建设部门的重视和社会的关注。景观照明通过技术与艺术的完美结合,为人们创造了优美、和谐、五光十色光的城市夜生活环境。     

智能门禁系统硬件结构的选择与设计研究

建立一个全方位、多层次、立体化及高效率的监控管理信息系统己成为物业管理的一项重要内容,而智能门禁管理系统是该信息化管理不可缺少的重要组成部分。本文主要对于智能门禁系统硬件结构的选择与设计进行分析与探讨,对于提高小区智能化管理具有一定帮助。     

榆树林油田水井钻关的几点认识

文章针对榆树林油田加密区水井钻关状况进行分类分析,得出了不同钻关时间内钻关区产量递减趋势:钻关时间3个月以内,区块开发状况基本保持稳定;钻关三个月后,产量有所下降,且随着钻关时间的增加,递减幅度增大。同时根据钻关区特点提出几点建议,为今后控制钻关区产量递减提供指导。     

利用PLC仿真软件组织PLC课程实践环节的教学

高职院校的机床电气控制与PLC课程设计,需要大量的实验设备。由于经费紧张,大多数高职院校的实验设备很难满足需要。因此,采用PLC仿真软件与计算机相结合的方法,解决课程设计中程序调试的难题,能收到较好的效果。     

雅砻江流域集控中心监控系统通信通道分析

梯级集控中心与梯级电站之间的通道模式决定了数据传输的安全性、稳定性及速率。文章介绍了雅砻江流域集控中心与梯级电站通信通道网络结构设计,分析了该结构设计的优点及不足之处。     

Dynamic advertising and pricing with constant demand elasticities

In this paper we analyze a stochastic dynamic advertising and pricing model with isoelastic demand. The state space is discrete, time is continuous and the planing horizon is allowed to be finite or infinite. A dynamic version of the Dorfman–Steiner identity will be derived. Explicit expressions of the optimal advertising and pricing policies, of the value function and of the optimal advertising expenditures will be given. The general results will be used to analyze the case of impatient customers. Furthermore, particular time inhomogeneous models and homogeneous ones with and without discounting will be examined. We will study the social efficiency of a monopolist's optimal policies and the consequences of specific subsidies. From a buyer's perspective, our analysis reveals that waiting – when looking at (immediate) expected prices – is never profitable should two or more units be available. But we will also prove that the sequence of average sales prices is monotone decreasing. Moreover, the techniques applied to solve the discrete stochastic advertising and pricing problem will be used to solve a related deterministic control problem with continuous state space.     

Optimal regime switching and threshold effects

We consider a general control problem with two types of optimal regime switch. The first one concerns technological and/or institutional regimes indexed by a finite number of discrete parameter values, and the second features regimes relying on given threshold values for given state variables. We propose a general optimal control framework allowing to derive the first-order optimality conditions and in particular to characterize the geometry of the shadow prices at optimal switching times (if any). We apply this new optimal control material to address the problem of the optimal management of natural resources under ecological irreversibility, and with the possibility to switch to a backstop technology.     

CPR1000项目核岛阀门采购进度控制分析

核岛阀门是核电厂重要的系统组成设备,涉及上下游的工作量大而广,其供应及时性对项目进度的有序推进尤为重要,本文针对岭澳二期、红沿河项目一期工程核岛阀门的供应状况进行研究,提出了针对性的进度控制优化策略。     

关于电力企业内部会计控制的探讨

电力行业是支撑国民经济的重要支柱之一。如何构建完善的内部会计控制体系,加强风险评估和风险控制,是当前电力企业发展重大问题。本文从电力企业内部会计控制的重要性方面着手,分析当今电力企业内部会计控制存在的一些问题,从而针对性地地提出加强电力企业内部会计控制的几点建议。