热带无线电波传播研究进展及核心影响因素分析

热带无线电波传播研究是近年来电波领域重要的研究分支之一。综述了国际电信联盟（ITU）和国际无线电科学联盟（USRI）关于热带无线电波传播的主要研究内容和进展情况,分析了与热带无线电波传播相关的核心影响因素,包括雨衰、对流层闪烁、大气波导、植被衰落、盐度等,最后,指出了关于热带无线电波传播需要进一步研究的方向。相关内容可为热带无线电波传播的深入研究提供参考。     

王祥芸：五屏联动营销的空间无限大

王祥芸认为,电影屏、智能电视屏、Pad屏、Phone屏、PC屏的五屏联动营销,显然比传统多屏的“PC端＋移动端”更有影响力和媒体价值。     

澳大利亚将实施家电无线电波管制

据澳大利亚《财经论坛报》报道,澳大利亚政府将从明年元月1日起,对吹风机、洗衣机、电冰箱等消费性家电产品和电脑产品所发出的干扰无线电波实施一项新的管制标准。 澳大利亚无线电波管理部门负责人指出,由于目前澳大利亚多种家电用品发出的干扰电波颇大,足     

最后的晚餐、最真的承诺——追悼李传屏老弟

今天上午在北京八宝山殡仪馆送走了传屏老弟,见到了传屏曾经任教过的北京大学、中国传媒大学以及北京联合大学等广告院系的领导们,也见到了传屏工作过的广告公司、     

一种针对特殊信号进行帧频处理的方法

文章主要介绍了一种针对特殊信号（例如帧频为24Hz的信号）在显示部分进行帧频处理的方法，指出此方法的关键是通过电视机主程序判断Vtital值是否超出所匹配屏的屏参规格范围。如果Vtotal值超出范田，则强行设置为屏参规格要求的典型值，再根据公式Dclk-Htotal,Vtotal,Vfreq计算帧频，使得输出给屏的各项屏参指标都符合屏的规格要求。     

三屏联投这么玩!

当我们说＂第二屏＂、＂第三屏＂的时候,我们在说什么？三星Mega6.3在2013年上市后,针对目标人群年轻化的特质,选择＂PC＋Pad＋Phone＂的投放策略,和优酷进行了为期28天的多屏联投合作,第三方调研机构华通明略的数据显示,无论是在认知度、喜好度上,二屏、三屏的广告效果都远远高于一屏的广告效果。     

天津日报LCD阅报屏项目实践初探

＂天津日报LCD阅报屏项目＂由天津日报传媒集团发起,以掌握新媒体传播主动权、充分发挥新媒体的优势资源、扩大党报宣传阵地、引导阅读新趋势、积极抢占新媒体市场为目的。在充分考察国内主要新媒体建设项目的基础上,吸收先进的传媒发布技术与形式的前提下投资兴建。     

全时全屏玩出“视界杯”

正世界杯大战中,乐视由"5星世界杯·5屏娱乐季"战略出发,根据网友对世界杯的关注时间点,以及不同的内容需求,共推出8档原创节目,运用其独有的PC屏、Pad屏、Phone屏、TV大屏以及电影大屏五屏资源优势,为全民打造24小时不间断的全时全屏观赛生活。     

视·屏合一 优酷土豆多屏营销战略升级

多屏互动的世界来了,由以前集中在双屏(电视、电脑)到三屏(电视、电脑、平板电脑)、四屏(电视、电脑、平板电脑、手机),再到户外大屏也被纳入。更大屏幕的智能手机、家用平板电脑、互联网电视不断推出,智能手表、谷歌眼镜、车载屏幕出现在消费者的生活里。《失控》作者、《连线》杂志创始主编凯文·凯利认为,在多屏时代,屏幕构成了一个     

变配电室里面直流屏的作用

直流屏对变电站来说是非常重要的,它的主要作用就是能够不间断地向变电站输送直流电源,进而达到电力设备的正常运行的目标。从当前的实际情况来看,直流屏的一些性能已经很难能够再次满足当前的用电需求了。为了缓解这一问题,我们大力采用超级电容直流屏,这是因为超级电容直流屏不仅能够解决供电问题,而且也大大提高了其自身的各项性能,特别是与蓄电池的直流屏相比,它的优势更为突出。本文就变配电室里面直流屏的作用进行简要的分析,仅供参考。     

电磁场数值模拟TLM算法及其应用

传输线矩阵（TLM）算法是基于Huygens的波传播模型，与计算机结合起来后，成为一种强有力的三维时域电磁场数值仿真算法，在1971年TLM被首次提出以后，便得到不断的改进，从二维到三维，从扩展型结点到凝缩型结点，从时域TLM到频域TLM，而其应用也从最初的处理电磁场问题发展到对微波电路的模拟，高速IC的设计，以及处理光学，机械学，热学和声学问题，本文详细介绍了二维、三维空间的TLM算法，扩展型结点和几种改进的对称凝缩结点，阐述了TLM在各领域的应用，最后还简单介绍了我们完成的工作。     

电子市场与企业采购:任务与技术的协合

采购是影响一个企业赢利的关键环节。电子市场作为一种完全不同于传统市场的、新兴的、虚拟的、依赖于互联网发展的新型市场,是电子商务的一种重要模式。本文认为,电子市场所具有的聚集功能、撮合交易功能和支持交易功能,能够支持企业除内部需求识别之外所有的采购任务,电子市场与企业采购之间有较高的协合程度。文章指出,电子市场将促进企业采购模式向电子化采购模式转化,大大降低企业的采购成本,提高企业的采购效率。它代表了电子商务未来发展的主流模式,并将成为企业采购的重要渠道。     

Anatomy of competitive advantage: towards a contingency theory of entrepreneurial marketing

Entrepreneurial marketing (EM), born out of the practice of firms operating in conditions of uncertainty, is emerging as a powerful alternative to cope with the decreasing effectiveness associated with traditional marketing. In this article, the authors provide their collective position regarding the field of EM. A brief history and conceptual background of EM is presented and the contextual differences that have shaped its evolution are considered. Distinctions between traditional and EM are derived based on discussions of the concepts of size, speed, market, opportunity, risk, and uncertainty. The perspective of value co-creation in uncertainty is used to develop a contingency framework to serve as the foundation towards a general theory of EM. Operand and operant resources and environmental conditions are proposed to moderate the EM process from opportunity recognition to entrepreneurial organization, EM, and temporary competitive advantage. The theoretical facets are illustrated with seven propositions and directions for future research.     

The Evolution and Development of Entrepreneurial Marketing

The purpose of this paper is to discuss the evolution of entrepreneurial marketing (EM). First an historical perspective of the evolution of EM is offered and some central incidents are identified. Further, empirical indications of small and medium-sized firm marketing behavior are reported and analyzed. Some distinctive differences between EM and administrative focused marketing are identified. This paper provides future scholars with a summary of how EM has evolved into a potential new school of marketing thought and offers several issues that should stimulate future research in EM.     

The Hotal and Catering Industry: Employment Prospects for the Eighties

Small business enterprises (SBEs) are considered to be the economic engine leading to worldwide economic development. They have attracted substantial consideration from researchers, academics and practitioners in the last three decades. Meanwhile, E-marketing (EM) has emerged as one of the key drivers in sustaining an organisation's competitive advantage. Yet, there is a lack of systematic empirical evidence regarding marketing activities that are affected by the use of EM in the (SBEs) context, and their consequent performance outcomes. Therefore, the purpose of this paper is to examine the impact of EM use by SBEs on marketing success and to develop and test a conceptual model of the antecedents and consequences of EM use by SBEs. The conceptual framework consists of the following constructs: EM budget, EM tools, pre-sales activities, after-sales activities, marketing performance and marketing effectiveness. Moreover, 12 hypotheses were developed and tested. Exploratory and confirmatory factor analyses were used to test the validity of measures, while structural equation modelling was used in hypotheses testing. Data were collected from 114 SBEs who had used different EM tools. Findings reveal that the use of EM tools has a positive influence on SBEs pre-sales activities, after-sales activities, marketing performance and marketing effectiveness. The results of this study have major implications for the marketing domain, as they stress the central role of marketing people in the successful implementation of EM in SBEs.     

电磁涡旋及其在无线通信中的应用

随着移动数据需求的飞速增长,频谱资源紧缺的问题已成为限制无线通信产业发展的瓶颈。电磁涡旋作为一项新的传输技术,引入轨道角动量这一新的复用维度,可以实现在同一频带同时传输多路信息,有望极大地提高通信系统的容量,有效解决频率资源短缺的问题。详细分析了电磁涡旋的结构和性质,概述了电磁涡旋的国内外研究进展,阐述了电磁涡旋的产生与接收方法及复用技术原理,指出了电磁涡旋面临的挑战与后续研究建议。     

Identifying risks in emerging market sovereign and corporate bond spreads

This paper investigates the systematic risk factors driving emerging market (EM) credit risk by jointly modeling sovereign and corporate credit spreads at a global level. We use a multi-regional Bayesian panel VAR model, with time-varying betas and multivariate stochastic volatility. This model allows us to decompose credit spreads and build indicators of EM risks. A key result is that indices of EM sovereign and corporate credit spreads differ because of their specific reactions to global risks (risk aversion, liquidity and US corporate risk). For example, following Lehman's default, EM sovereign spreads ‘decoupled’ from the US corporate market, whereas EM corporates ‘recoupled.’     

Corporate Social Responsibility as a Strategic Shield Against Costs of Earnings Management Practices

We highlight how Corporate Social Responsibility (CSR) can be strategically used against the negative perception from earnings management (EM). Using international data, we analyse the effect of CSR and EM on the cost of capital and corporate reputation. Results confirm that CSR strategy is positively valued by investors and other stakeholders. Contrary to EM, CSR has a positive effect on corporate reputation and lowers the cost of capital. In addition, we also find that the favourable effect of CSR on cost of capital is consistently more intense in firms that show signs of EM indicating that the market does not identify when CSR practices are used as a strategy to mask EM. We also demonstrate how institutional factors influence the above relationship.     

Financial Globalisation and Emerging Markets Volatility

The volatility of capital flows to emerging market (EM) countries and frequency of financial crises have imposed high welfare costs on the countries involved. The empirical literature provides, at best, a mixed picture on the relationship between long‐run EM country growth and financial integration. Meanwhile, the prevailing policy discourse regarding reform of the international financial system remains incomplete: the focus has largely been on either institutional and policy measures required of EM countries or international crisis‐resolution procedures. The role played by private financial markets and institutions in the developed world has not received adequate attention. This paper describes some of the structural features inherent in today's financial markets that directly contribute to the instability in EM capital flows.     

Adoption of multiple electronic marketplaces: Antecedents from a grounded theory study

To achieve economies of scope, most motor carriers combine long-term contracts with shippers and brokers with periodic spot assignments found on electronic marketplaces (EMs). While previous research has addressed how carriers adopt an EM, we know little about factors that influence carriers to adopt multiple EMs. Given the rise of the platform economy of the trucking industry, we chose to address this gap and generate mid-range theory on adopting multiple EMs in a logistics context. To do this, we applied grounded theory and conducted 23 interviews with motor carriers and EM experts in North America and Europe until we reached theoretical saturation. Our findings reveal that many motor carriers adopt a portfolio of different EMs, and that their awareness of platforms, expected and realized benefits, attitude, and vigilance determine how they configure their EM portfolios. The implication for existing theory is that, while previous studies depicted EM adoption from a single-system perspective, we found that it is actually a continuous selection process that follows a portfolio perspective. Our paper also has implications for practice in that it illuminates the rationales behind EM portfolio development and identifies actionable factors that can help managers configure stronger portfolios.