Euler(p,q) Processes and Their Application to Non Stationary Time Series with Time Varying Frequencies

We introduce Euler(p, q) processes as an extension of the Euler(p) processes for purposes of obtaining more parsimonious models for non stationary processes whose periodic behavior changes approximately linearly in time. The discrete Euler(p, q) models are a class of multiplicative stationary (M-stationary) processes and basic properties are derived. The relationship between continuous and discrete mixed Euler processes is shown. Fundamental to the theory and application of Euler(p, q) processes is a dual relationship between discrete Euler(p, q) processes and ARMA processes, which is established. The usefulness of Euler(p, q) processes is examined by comparing spectral estimation with that obtained by existing methods using both simulated and real data.     

大断面黄土隧道洞口段施工数值模拟分析

依托平阳高速某黄土公路隧道，采用三维数值模型对隧道洞口段不同施工工法施工过程中围岩变形和支护结构的受力规律进行研究。研究结果表明：(1)各工法下施工阶段最不利状态：台阶法为上台阶施工，CRD法为先行洞上导坑施工，双侧壁导坑法为中上导坑施工，当进行到上述工序时应加强监控量测，开挖后及时施作初期支护。(2)黄土隧道洞口段优先采用双侧壁导坑工法以防止围岩产生过大变形。     

我国家电业逆向物流平台选择策略分析

环保和贸易壁垒促使我国家电行业建立废旧产品的逆向物流平台,生产者有三种逆向物流平台可以选择:其一,通过由社会或国家投资建设的废旧家电回收处理系统;其二,通过行业联盟建设专门回收处理系统;其三,自行建立回收处理系统网络。企业应根据自身生产方式、配送模式及废旧产品特点进行选择。现阶段对国内平台应首先依赖社会或政府的回收处理系统,国外平台依赖第三方或者与国际大公司建立战略联盟。长远来看,发展与竞争寡头地位的需要,企业应建立自己的逆向物流系统以更好地整合供应链和提高竞争力。     

循环经济视角下的企业逆向物流分析

依据可持续发展的理论，提出在循环经济视角下发展逆向物流的思想，阐述逆向物流对循环经济发展的战略意义，并得出发展逆向物流，实现循环经济发展模式的对策和建议。     

高校教育技术“反转”培训模式研究

反转教学也称为翻转课堂（Flipped Class Model），是利用信息技术改革课堂教学过程的一种“破坏性”创新。文章分析了将反转教学应用在教育技术培训中的优势，构建了教育技术“反转”培训模式，并将其应用在教育技术培训实践中。希望藉此找到教育技术培训新的突破口，提高教育技术培训的针对性、实效性、吸引力。     

深基坑变形影响因子分析及预测方法研究

影响基坑变形的因子有很多，有主要因子和次要因子。根据实际工程经验以及相关资料，在较为全面地总结所有影响基坑变形因子的基础上，结合层次分析法，筛选出主要影响因子，建立一定的量化标准。将影响因子作为输入层，构建基于主要影响因子的BP神经网络。结合天津市中国铁建国际城1D地块深基坑工程，选出围护结构发生明显变形的各时间段，建立17×106的训练数据，采用黄金分割法对隐含层的节点数进行筛选，以4 m，8 m，12 m，16 m处的变形数据为目标层进行训练和仿真。最后，对其它测斜点的变形进行预测，精度满足要求，验证了这种影响因子选择和样本选择方法的有效性，对基坑变形预测有一定的应用指导意义。     

Impact of Retailers with Knowledge of Supplier's Inventory on Supply Chain Performance

We model a supply chain consisting of a supplier and multiple retailers facing deterministic demand. We denote some retailers as strategic in the sense that given the supplier inventory information, they will implement the optimal stocking policy by incorporating such information. On the other hand, some retailers are denoted as naïve in the sense that they ignore supply information and resort to a simplistic ordering policy. Naïve retailers learn the optimal policy over time and adjust their orders accordingly. We study the dynamics of this game and investigate the impact of such strategic and naïve retailers on the cost, ordering pattern and stocking policies of all parties. We analyze the supply chain under two scenarios: the centralized supply chain where the objective is to minimize the total supply chain cost, and the decentralized supply chain where each self‐interested player minimizes its own cost in a Stackelberg game setting. We fully characterize the optimal policies under both centralized and decentralized scenarios and show that, surprisingly, the supply chain might be better off by virtue of naïve retailers. The result is driven by the fact that strategic and naïve players’ decisions shift the positioning of inventory in the supply chain with its final impact being determined by the relative costs of different retailer‐types. Our results also offer managerial insights into how access to supply information can improve supply chain performance.     

可编程时间定时器

本文介绍一种采用CMOS通用器件设计的键盘编程倒计时定时电路的组成、工作原理和使用方法．     

车行横洞施工对隧道主洞变形的影响

针对隧道车行横洞施工对主洞结构产生影响，以运城 灵宝高速公路中条山隧道工程为依托，采用现场试验和三维有限元仿真的方法，对车行横洞施工阶段主洞的变形规律进行了研究。研究结果表明：车行横洞施工对主洞的影响，在时间上主要表现在交叉口初支拆除和横洞的第1个开挖步，随着横洞开挖深度的增加，主洞结构的变形逐步趋于稳定;车行横洞施工对隧道主洞围岩变形影响主要表现为主洞拱顶下沉量增加和开挖侧拱脚水平位移减小，主洞未开挖侧拱脚水平位移影响不大。     

Reverse Mortgage Fraud Against Seniors: Recognition and Education of a Burgeoning Problem

With the senescent population and the popularity of aging in place, many seniors are attracted to reverse mortgages to plan for retirement and to maintain their existing housing situation. Although theoretically reverse mortgages represent a viable investment product for those considering retirement, several pitfalls are possible for seniors, who can be unsuspecting victims of fraud. This article provides information detailing the etymology of fraud activities within this market through a storyboard that depicts the various stages of the fraud process. It is hoped that such a tool can enhance the education of consumers on this mortgage product.