IP电话发展现状及其前景

本文介绍了IP电话的概念、应用特点和主要技术,以及IP电话发展的过去、现在和未来。     

内蒙古地区城镇居民肉类消费需求研究

本文以具有典型内陆消费特点的内蒙古地区为例,通过构建修正的AIDS模型即LA/AIDS模型和扩展的LES模型即ELES模型,利用2000年到2011年内蒙古城镇居民肉类消费的时间序列数据,对该地区城镇居民消费结构的变化趋势进行了实证分析。结果表明：当收入增加时,人们会更多的消费羊肉和牛肉,在考虑价格因素后,猪、牛、羊、鸡四种主要肉类消费支出份额趋于平衡;牛羊肉自价格弹性绝对值较大,但四种肉类都属于生活必需品。     

2011年银行间市场运行报告

2011年,银行间市场交易整体呈现稳步增长态势,市场成员继续壮大。主要特点是：货币市场利率对货币政策反应灵敏,随调控措施整体走高,波动加大,市场成交明显增长;债券市场基础设施及制度建设持续稳步推进,成交量微幅下跌,银行间国债收益率曲线先升后降;对外经济活动活跃、市场机制改革等多因素推动银行间外汇即期市场持续较快发展;衍生品市场基础设施建设进一步完善,利率互换成交活跃,境内外外汇衍生品价差反转。     

Scheduling deteriorating jobs with CON/SLK due date assignment on a single machine

This paper considers the problem of scheduling deteriorating jobs and due date assignment on a single machine. The actual processing time of a job is a linear increasing function of its starting time. The problem is to determine the optimal due dates and the processing sequence simultaneously to minimize costs for earliness, due date assignment and weighted number of tardy jobs. We present polynomial-time algorithms to solve the problem in the case of two popular due date assignment methods: CON and SLK.     

有线电视光缆传输系统指标的分析与设计

介绍了有线电视网中ＡＭ 光缆干线传输综合指标的分析与设计。由于ＤＦＢ激光器间的非线性有较大差异,故引入了光链路这一参数。当把这一参数引入有线电视光缆干线设计时,可根据有线电视光缆系统不同传输距离、光接点的分配指标和光缆干线传输系统的实际情况,计算光链路损耗,以确定光端设备的选型,从而进一步确定光缆干线传输系统的设计,使得有线电视总系统指标给以保证     

羰基合成法制取高纯纳米氧化铁工艺研究

纳米氧化铁是近年来研发的新型纳米材料,它具有良好的光学、磁性、催化性能,在涂料、磁性材料、医学磁介质和催化等方面有广泛的应用前景,采用传统技术生产的纳米氧化铁因其粒度分布宽,纯度低等问题无法用于生物医药等高端领域,本文通过实验的方法介绍了一种新型高纯纳米氧化铁生产技术,可为高纯纳米氧化铁的研究和生产提供参考。     

矿产开发负效应与资源生态环境补偿机制研究

矿产开发的负效应是指采矿活动造成的资源生态环境损失,主要表现为资源耗损、生态破坏、环境污染以及区域发展能力下降等。本文基于矿产开发的负效应,初步构建了矿产开发的资源生态环境补偿机制的基本框架。提出应采取资源补偿、生态环境补偿与矿区/区域补偿,实行防范性补偿、即时性补偿与修复性补偿,实施实体性补偿、功能性补偿与价值性补偿。不同的补偿类型,其补偿主体、客体、原则、标准、方式各不相同,但总体上都遵循立法约束、政策引导与行政监管相结合的三位一体的补偿运行模式。建议开展矿产开发的资源环境补偿机制建设试点工作;形成部门间协调管理的工作机制;加强对矿产开发生态环境补偿的监督和评估。     

时序分析在地下洞室变形监测数据处理中的应用

时序分析法是广泛应用于多领域的统计分析方法,在岩土工程数值分析当中也有广泛应用,SAS/ETS(Ti me Series Forecasting)时序分析系统是一种智能化时序分析工具,本文运用SAS数据挖掘工具中时序分析组件对某水电站地下引水发电系统原位监控位移时间序列进行时序预测分析。实践表明,SAS/ETS时序分析方法基本能反映出蕴涵在位移序列中的岩体变形规律,预测结果与实测结果一致,可以运用于工程实践。     

The role of geographic distance in completing related acquisitions: Evidence from U.S. chemical manufacturers

Acquisitions often do not reach completion when buyers' initial evaluations change during post‐announcement due diligence investigations, but research offers only limited explanations for when such deal‐cancelling new information will be most common. Drawing from the spatial geography and acquisition strategy literatures, we argue that successful completion of acquisitions can be partially explained by their spatial characteristics. We start by predicting that geographic distance has a particularly strong impact in reducing the likelihood of completing related acquisitions; we then identify contingencies based on multiple forms of direct, contextual, and vicarious experience that can help acquirers overcome the constraints of distance. We test the arguments with a sample of 1,603 domestic acquisitions announced by 724 U.S. chemical manufacturing firms between 1980 and 2004. Copyright © 2015 John Wiley & Sons, Ltd.     

Discrete-order admission ATP model with joint effect of margin and order size in a MTO environment

Swarming demands and seasonality periodically induce a stringent capacity problem in the made-to-order (MTO) B2B environment. Desirable order admission is a tactic with minimal application cost for handling this problem. A real-time order admission problem with limited major-customer population and batch-size demand with heterogeneous distributions is modeled as a dynamic and stochastic knapsack problem. The optimality of the Markovian deterministic reward-threshold policy is verified. Optimal policy, basic policy, and the capacity rationing method are compared in the designed experiment. The numerical results suggest great potential for increasing profit using the optimal order admission policy for MTO businesses.