传统基站到有源天线基站的演进

随着无线网络的发展,基站架构也不断演进。详细介绍了传统基站、分布式基站、有源天线基站的架构,对比了其优缺点,说明了演进到有源天线基站的必然性。针对有源天线,明晰其概念,给出了设计思路,探讨了其技术优势。有源天线可通过波束成形覆盖更多小区,完全可满足未来低能耗、低成本绿色移动通信系统的发展要求,将成为基站演进的必然趋势。     

国家税务总局发布《关于出口货物劳务增值税和消费税有关问题的公告》(下)

(接上期)八、出口企业或其他单位出口适用增值税免税政策的货物劳务,在向主管税务机关办理增值税、消费税免税申报时,不再报送《免税出口货物劳务明细表》及其电子数据。出口货物报关单、合法有效的进货凭证等留存企业备查的资料,应按出口日期装订成册。九、以下出口货物劳务应按照下列规定留存备查合法有效的进货凭证:(一)出口企业或其他单位从依法拍卖单位购买货物出口的,将与拍卖人签署的成交     

中国货物贸易出口量的影响因素--基于引力模型的极值边界分析

对外贸易是拉动经济增长的三驾马车之一,我国出口贸易对经济的增长作用一直非常显著,因此对贸易出口量影响因素的深入研究十分必要。本文依据国际贸易理论,对贸易“引力模型”进行扩展,引入极值边界分析方法（Extreme Bounds Analysis , EBA ）,采用2003～2012年省际区域面板数据,对我国货物贸易出口量的影响因素进行实证检验,得出的结论是各省外商直接投资、进口额、工业产值、固定资产投资、税收收入、最终消费是我国货物贸易出口量的“稳健性（Robest ）”影响因素,并据此提出促进对外贸易发展相关政策建议。     

折旧政策：对企业会计信息的影响

折旧政策的选择将会直接影响企业的会计信息质量。本文主要通过对国内企业的折旧政策现状及折旧政策的阐述，结合我国企业固定资产的特点，对影响企业折旧政策选择的因素以及折旧政策对企业会计信息产生的不同影响进行了分析，进而提出了自己的基本观点。     

薄镀层彩涂基板生产时锌层的控制

本文作者通过自身多年在生产线上总结的实际经验,从多角度分析了当前薄镀层彩涂基板生产时对钢带锌层控制的原理和方法,探讨了连续热镀锌超薄镀层带钢生产中的一些实际问题。     

技术创新对山东经济增长的贡献研究

技术创新理论是现代西方经济理论的重要分支，在分析经济增长方面起着重要作用。本文利用索洛的“余值法”测算了技术创新对山东省经济增长的贡献，结果表明，技术创新对于经济增长的贡献相对比较低，这就决定了山东省经济增长的粗放性。山东省要实现经济的可持续发展，就必须依托技术创新促进经济的集约化增长，走新型工业化道路。     

浅谈如何对沥青拌合站除尘设备进行维护与改进

本文就沥青拌合站除尘设备的工作原理,及对沥青拌合站除尘设备进行维护与改进的办法进行探讨。     

DISTANCE‐SEGMENTED RURAL TOURISTS

This article uses travel distance to segment rural tourists in a tourist destination in the U.S. Midwest. A distance decay pattern was identified, with more than half of the respondents traveling from a location within 200 miles of the destination. The differences in the socio‐demographic, trip‐related characteristics, and destination activities of these tourists were examined across distinct distance segments. Among other findings, the study revealed that tourists from within a 50‐mile radius participated in most of the activities, and those traveling between 200 and 600 miles made up the majority of business travelers. These two segments also had a higher participation rate in the recreational activities than did the other distance segments. The findings of the study show that simple variables such as distance travel remain viable for destinations, particularly those in the rural area, to understand the tourists for segmentation purpose.     

供应商专项投资与感知的合作风险:关系发展阶段与控制机制的调节作用研究

This study examines the dynamic nature of suppliers’ perceived relational risks arising from transaction-specific investments (TSIs) in their relationship with manufacturers, and the moderating effects of contracts and relational norms, during the developmental process of manufacturer-supplier relationship. An empirical study was conducted with data collected from 261 suppliers and manufacturers in the Chinese consumer electronic appliances sector. We found that suppliers’ TSIs have a positive effect on their perceived relational risks, and in different phases of a relationship effect varies significantly. Results of the research also show that both contracts and relational norms have negative moderating effects on the relationship between suppliers’ TSIs and their perceived relational risks, and moderating effects during are different across various phases of a relationship. Translated from Zhongguo Guanli Kexue 中国管理科学 (Chinese Management Science), 2006, 14(1): 30–36     

EE system电子工程系统操作指南

EE system是微机上使用的电子工程系统.本文介绍该软件的主要功能和印制板布线(PCB)的操作方法.