高效率谐波调谐功率放大器的发展综述

作为发射机中耗能最高的器件,功率放大器（功放）产生的热量也最多,提升其效率对整个系统至关重要,因此关于提高功放效率的研究从未间断。回顾了谐波调谐功放的数学推导过程,讨论了其提升功放性能的数学原理,从增益、效率和输出功率等方面对比了各种谐波功放的性能,在此基础上总结了各类型谐波控制功放的特点及其发展现状。随后将其与近年来流行的连续模功放进行了比较,归纳了连续模功放的特点及其与谐波调谐功放的联系。最后指出了谐波调谐功放的发展趋势。     

Java开发:实现网站信息批量析取

使用java字符串处理和多线程并发技术,构造实用的页面解析工具,实现网站内容高效、低噪地批量析取。     

奇瑞重工2ZF-4型插秧机

产品特点： ●配备高效、低振、低噪、低油耗汽油发动机。 ●在大马力发动机的支持下，设计高低两挡工作速度，满足不同工作环境下的要求。     

浅析电视播控中心对于UPS的选择

UPS也就是不间断电源，当发生停电事故时，UPS可将电池直流电能转换为220V交流电。因此，UPS是一种可提供持续、稳定电源供应的外部设备，可有效保护系统负载的软、硬件。本文主要分析了不间断电源的技术原理、技术特点，探讨电视播控中心对不间断电源的需求和选择。     

ERP手机办公系统的应用

因中国移动通信内蒙古有限公司的业务需求而研发的手机办公ERP订单审批系统采用WAP20、移动流媒体、3G等技术，实现了随时随地了解和查询ERP采购订单并审批的功能，提高了办公效率，体现了手机办公的优势．促进公司业务发展和服务水平的提高。     

高效率线性RF功放的研究与设计

应用EER(Envelope Elimination and Restoration)线性功放技术和高效率D类音频放大技术，实现了一个高效率线性RF功率放大器。该线性放大器为AM调制，7MHz时效率优于75％。     

高速嵌入式系统中电源噪声抑制方法

根据平面腔体谐振模型理论推导出高速嵌入式电路电源平面对阻抗函数关系式,分 析了电源平面对的谐振特性与PCB板材、介质层厚度以及导体平面的电导率之间的关系,得 出可通过减小介质层厚度、使用高介电常数的介质材料以及增加介质损耗等3种方法来抑制 电源平面对的谐振效应,并使用全波仿真方法验证了可行性。从时域仿真了高速电路中的噪 声传播与电源平面谐振的相互关系,结果表明,通过抑制电源平面对谐振阻抗可将电源噪声 减 小至原有结构的15%,从而有效提高系统的电源完整性。     

大功率LED路灯照明驱动的研究

目前LED路灯驱动电源存在着输出功率低、转换效率差、功率因数不高、输出特性不稳定及可靠性差等问题，严重制约了LED路灯的推广使用，本文针对以上问题优化了LED路灯驱动电源电路。采用了HV9910这款灵活简单的LED驱动器IC提供电源，PWM自动调节实现恒流输出，稳压管过压锁定实现空载保护，电磁隔离和光隔离实现隔离输出。本设计体积小，微调反馈电路可设置作为为LED驱动常用的350mA或700mA恒流输出，简化了电路的设计，提高了驱动电源的可靠性。     

小型化低功耗数字平台设计关键技术

对于使用电池供电的背负式或手持电台,电台的平均功率消耗决 定了电台在战场的可运作时间。因此,数字平台的硬件设计和软件设计都必须把电台的大小 、重量和电源（SWAP）的设计作为首要的考虑事项。从动态时钟调整、电源供应调整、操作 模式、工作周期影响、静态和动态电源对比、硬件电源的小型化考虑以及可编程逻辑和ASIC 的设计对比等多方面进行了研究,为构建灵活的软件无线电平台体系结构提供了参考。     

移动电源“乱”字当道

正移动电源市场存在品牌繁多、价格混乱、虚标容量、质保不一、材质低劣、存安全隐患等问题"以前摩托罗拉、诺基亚时代,手机都是非智能的,仅用于接打电话、收发短信,一天一块电池足够了。但自从苹果、三星智能时代的到来,手机从通讯器摇身变为了微型电脑,邮件、微信、QQ等即时聊天工具的使用,使得手机耗电量大大增加,一天最少需要充两三次电,没有移动电源根本无法达成,移动电源成了不少人日常生活中必备的工具。"某广告公司的客户总监刘先生告诉记者。移动电源     

Rejoinder to Hunt’s ‘The bases of power approach to channel relationships’

Abstract

The critique of Blois and Hopkinson presented by Hunt is examined. Hunt argues that Blois and Hopkinson: make criticisms of the power-base approach in channels of distribution research; that these criticisms can be categorised under five headings; and, that each of these criticisms is suspect. This rejoinder examines each of Hunt’s claims and argues that they are not fully convincing.     

消防应急救援职能定位的法学思考

消防应急救援是《消防法》赋予公安消防队、专职消防队的一项法定职责。从法律规范的规定来看,消防应急救援既是政府应急救援的专业力量,也是政府应急救援的骨干力量;从法学理论的分析角度来看,消防应急救援还应当成为政府应急救援的主体力量。     

Power and responsibility: How different sources of CEO power affect firms' corporate social responsibility practices

Does greater CEO power come with more responsibility? Previous scholarly work in this field entails divergent results on this question. Based on the upper echelons theory and CEO power literature, this study aimed to explore the mechanisms underlying how different sources of CEO power, including structural, ownership, expert, and prestige power, affect firms’ corporate social responsibility (CSR) practices and whether such relationships are moderated by firm visibility. Using a panel dataset comprising 6604 yearly observations of Chinese publicly traded firms from 2009 to 2019, we found that structural power is negatively related to CSR practices and that expert power is positively related to CSR practices, whereas ownership power and prestige power have no direct relationship with CSR practices. Our results show that firm visibility weakens the negative relationship between structural power and CSR practices and strengthens the relationship between expert power and CSR practices, respectively. Overall, this study reconciles the mixed results of previous studies on the impact of CEO power on CSR and integrates the effect of firm visibility as a contextual factor. This article concludes with practical recommendations on how to manage CSR engagement.     

渠道权力结构的过度倾斜与权力失效——基于农产品营销渠道的研究

本文通过对中国农产品营销渠道的考察,发现了渠道权力结构的过度倾斜与权力的失效问题。作者认为,在渠道权力结构理论背后存在着一个隐含命题,即渠道关系双方的规模与实力应当是对等的,或者二者之间的反差在一个合理的区间内。在渠道关系中,如果一方是为数众多、分散且规模弱小的成员,而另一方是规模巨大、实力较强的成员时,就会出现权力结构的过度倾斜,而当渠道中权力弱势地位一方采取一致性的“反抗”行为时,权力优势成员的权力就会失效。     

The dynamics of networked power in a concentrated business network

The purpose of this paper is to investigate the dynamics of networked power in a concentrated business network. Power is a long standing theme in inter-organizational research, yet there is a paucity of studies about how power emerges and is constructed over time at the network level. The paper adopts process, systems and network theory to interpret a rich single case study from the food industry. Three power mechanisms are identified, gatekeeping, decoupling and resource allocation, which form the basis of a model of networked power dynamics. Empirically tracing the dynamics of networked power highlights the economic contents of interactions. The paper extends current understandings of power as ‘conflict and coercion’ to include influencing, leveraging and strategic maneuvering in the actual performance of networked power.     

零售商抗衡势力假说研究评述

文章以纵向市场结构为背景对零售商买方势力进行了较为清晰的界定,并依据买方势力的福利影响区分买方垄断势力和买方抗衡势力。然后从理论模型、经验研究和实验设计等方面,系统综述了零售商抗衡势力的测度方法及其对市场价格、市场绩效和社会福利影响的相关研究进展,以此对我国零售业实施相关的规制政策提供一定的理论指导和经验借鉴。     

Estimating Firm-Specific and Relational Properties in Interorganizational Relationships in Marketing

ABSTRACT

This research attempts to distinguish empirically between the potential influence of a manufacturer as compared to the influence of a manufacturer's salesperson over an industrial distributor. Given the existence of such a distinction, the scope of such influence is examined with regard to a distributor's business in eight different areas of potential influence: price, order quantity, product line, advertising and sales promotion, customer service, inventory, customer credit, and display. Data were collected from 412 industrial distributors in a marketing channel. The authors utilized regression analysis to distinguish between manufacturer and manufacturer salesperson power. Then, factor analysis was utilized to determine if the salesperson does have power over policy areas apart from that of the manufacturer. Research results suggest that the manufacturer's salesperson, compared with the manufacturer, possesses a different domain of power than does the manufacturer in a channel containing an industrial distributor.     

资本稀缺性与企业权力安排

分析已有的企业权力理论,认为传统的权力理论由于受到了资本至上的观点和现行法律规定的束缚,从而没有给出令人信服的解释,并在此基础上,确定对企业权力安排的看法,即组成企业的各要素的相对稀缺程度或替代程度是决定其拥有者在企业的权力安排的博弈中所处地位的决定因素。     

The Exercise and Acceptance of Power in an Industrial Channel Dyad

ABSTRACT

Purpose: Power is an adaptive process in which power exercised by one firm could be less than, equal to, or greater than that accepted by another over the course of different periods. This study incorporates previous research on power asymmetry to examine the process of power exercise and acceptance over three stages: power exploration, power balance and power idleness.

Design/methodology/approach: Semistructured interviews were conducted with 4 powerful suppliers (the source firms) and their distributors (the target firms) in different industries.

Findings: The exercise and acceptance of power are influenced by expected rewards and expected costs in the power exploration stage and are impacted by dependence and trust in the power idleness stage; in the stage of power balance, power exercise and acceptance will not be altered. Under power shortage, the source firm will attempt to use less power and/or to enhance the levels of power accepted by the target; under power surplus, the source firm will transform the surplus into company performance and/or personal interests.

Research limitations/implications: The findings deepen our understanding of how power is exercised and accepted in a channel dyad over time, and of how firms behave in dealing with power shortage and power surplus.

Practical implications: The findings also provide some guidance for practitioners, so that they may apply power more appropriately based on different power stages in marketing channels.

Originality/value: This study extends our knowledge on power evolution over three stages from both a power holder and an acceptor viewpoint.     

论公共住宅金融的经济基础

住宅供给包括优质住宅供给和普通住宅供给,优质住宅供给刚性强,普通住宅供给弹性大。普通住宅成本最低,也是住宅保障的主要依靠对象。公共住宅金融源于消费者市场支付能力的不足,但囿于公共住宅金融的价值属性,公共住宅金融并不能弥补消费者支付能力的永久不足,只能弥补消费者支付能力的暂时不足。公共住宅金融只有将劳动力价值作为自己发展的经济基础,才能确保公共住宅金融的稳健运行,才能突破西方公共住宅金融的历史局限性。