S频段800W固态功放的研制

采用功放管合成、电路模块合成及插箱整机合成相结合的三级合成方案，研制成功了一种S频段连续波800W固态功放，经测试在2025—2120MHz频段，功放连续波输出功率1dB压缩点大于59dBm（800W），增益大于68dB，功率附加效率25％，合成效率达到85％以上。     

毫米波准光功率合成技术的研究进展

总结了毫米波、亚毫米波频段的准光功率合成技术的研究进展,介绍了准光功率合成技术早期的研究成果。重点讨论了近期提出的引入全息技术的准光功率合成技术。全息技术有效地解决了器件小型化和散热间的矛盾,能满足未来更高频率的输出功率和效率的要求。     

802.11n高线性功率放大器的设计与实现

为了扩大802.11n无线产品的覆盖范围，设计了一款符合802.11n标准的2.4 GHz高线性 功率放大器。在该功率放大器的设计中采用了双路均衡功率合成技术和差异化加速开关技术 ，在提供高功率输出的同时满足了802.11n的误差向量幅度（EVM）的要求，尤其是实际应用 中的动态EVM。测试结果表明，该功率放大器回退7 dB后的线性输出功率为27 dBm，此 时的EVM为-30 dB，合成功率输出为29.5 dBm。该功率放大器可广泛用于无线局域 网中，与各种类型的无线AP直接匹配使用，提高其覆盖范围。     

一种8 mm频段封闭腔全息准光功率合成网络的设计

基于周期相位栅格的塔尔博特效应,提出了一种新型的毫米波频段18合1封闭腔全息准光高效功率合成网络。采用了相邻半周期相差π的特殊周期相位栅格,置于垂直于栅格的零场区域的金属壁封闭了合成网络,解决了辐射损耗和电磁泄漏问题。基于光学标量衍射理论算法仿真的衍射图样与目标场对比得到的适应度函数,以基因算法优化得到相位栅格,并以变宽波导阵透镜物理实现。在37.5 GHz,功率合成网络实物测试的效率为81〖WT《Times New Roman》〗%〖WTBZ〗,与电磁仿真的89%基本相符。准光功率合成网络可由一维扩展至二维,合成效率与阵元数、阵元间距无关,可实现毫米波及THz频段的大规模数量器件高效功率合成。     

调整初相提高多频点信号功率利用率的方法

通过分析信号初相与多频率合成信号包络的关系,提出利用初相调整的方法来优 化合成信号包络,从而提高功放的功率利用率。仿真分析结果和实际应用表明,该方法可以 很好地降低合成信号包络的最大电平,使合成信号包络尽可能在放大器的线性范围内,从而 有效抑制了交调和互调成分以及谐波成分,提高了功率利用率。     

Galileo E1-B/C仿真信号合成通道设计

针对Galileo信号合成中超长测距码生成以及功率控制的硬件实现难题,设计了双 口RAM的重载查表式测距码生成器,同时,基于CBOC副载波特性,提出了比例因子功率控制 的优化方法,并进行了仿真实验对比。结果表明：该方法设计的信号合成通道极大地节约了 内存空间和硬件乘法器资源,单片FPGA内信号合成通道的集成数量扩大1倍以上,合成的Ga lileo信号具有理想CBOC信号特征,且接收机定位解算正确,解决了仿真信号的硬件实现难 题。     

非均匀天线组阵中引入对角加载的合成算法

针对非均匀天线组阵中常用的SUMPLE与PMFM（Proposed Matrix-Free Method）算法合成性能较差的问题，分别在SUMPLE与PMFM算法模型中引入对角加载技术，提出了一种新的信号合成算法。该算法利用权值幅度估计各路噪声功率，并对角加载到权值迭代算法中以得到准最优复权值向量。理论分析与数值仿真均表明,在不明显增加计算量的基础上，新算法在非均匀组阵中的合成损失明显低于SUMPLE与PMFM算法，同时新算法的收敛速度也与各自模型算法相当，因此更加适用于实际组阵系统，具有重要的工程应用价值。     

光纤激光器相干合成相位检测与控制技术

高功率光纤激光的相干合成技术是实现高功率高亮度固体激光系统的重要技术途径,它可以在提升光纤激光系统总功率的同时,保持良好的光束质量,从而使输出激光的亮度大幅提高。在MOPA方案中,为了实现多个光纤放大器的输出光束的相干合成,必须对每—路的光纤放大器实现相位的检测与控制。通过精确控制激光器的相位,从而使输出光束相干合成,远场光峰值功率可以达到单个激光器的N2倍。     

C波段四管功率合成体效应振荡器

本文介绍一种四管功率合成体效应振荡器。这种功率合成器结构简单、体积小、重量轻,适合于空间电子设备使用。振荡器最大功率输出为1.2—1.5W,功率合成率近100%,直流—微波转换效率达3.8%。功率合成器采用了双金属结构和介质加载的“综合”补偿法,相对频温系数达到2×10~(-5)/℃。工作在注入锁定状态,增益为16db时锁定带宽为40MHz。     

W频段机场异物探测雷达收发前端

主要介绍了一种用于机场异物探测雷达的W频段调频连续波（FMCW）收发前端的研究工作。基于波导T形接头的等效计算公式,对W频段波导合成电路进行了集中参数的电路建模,通过优化设计波导合成电路的参数,提高了波导合成电路的容差特性,解决了W频段波导功率合成电路加工精度要求高的问题,实现了W频段4路功率合成;采用低损耗的石英基材设计开发了微带薄膜滤波器技术,实现了W频段FMCW雷达接收前端的一体化集成设计;通过对低噪声放大器芯片键和金丝的匹配设计,实现了W频段收发前端的低噪声接收。最终实现的W频段FMCW收发前端的发射功率优于360 mW,接收机噪声系数优于5 dB。研制的收发前端为W频段FMCW雷达提供了一种有效的射频前端的解决方案。     

宽带CDMA系统中线性空时多用户接收机结构与性能分析

2000年美国SEC在制定公平披露规则的同时制定了规则10b5-1和规则10b5-2。规则10b5-1规定,如果交易人在买进或卖出证券时“知道”该有关发行人或证券的非公开的重大信息,那么他的证券交易就属于内幕交易。规则10b5-2规定,家庭成员之间或其他个人关系之间私用机密信息也应承担私用理论下的责任。文章最后指出,我国法律应该将内幕人员的家庭成员也纳入内幕交易人的范围。     

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.     

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.     

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.     

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。     

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。     

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。     

基于静止无功补偿器的可变电抗拓扑结构研究

介绍了基于静止无功补偿器的可变电抗器拓扑结构,从理论上分析了可变电抗器拓扑结构。该可变电抗器可应用于静止无功补偿器,可用于配电网,对于提高电力系统的稳定性和改善电能质量具有积极作用．也有治理谐波、控制调功、调压等功效。     

零售商买方势力理论研究述评

随着零售业集中化趋势不断增强和大型零售商不断涌现,零售商买方势力日益突出.买方势力问题已经受到了理论界和产业界的高度关注.文章梳理了买方势力理论研究的主要成果,从买方势力的内涵、形成因素、经济效应和政府规制等几个方面系统地阐述了买方势力理论的研究进展,并对未来的研究方向进行了展望.     

Trust as a Mediator of Channel Power

Abstract

Thriving longterm channel relationships require trust. Previous empirical work and metaanalysis have emphasized the central role of trust but its potential as a mediator of power has not been tested empirically. A model is proposed that hypothesizes a central, mediating effect for trust between power constructs (power asymmetry, coercive and noncoercive application of power) and key behavioral and attitudinal relationship outcomes (conflict, cooperation and satisfaction). The model is tested on a large sample (N = 887) in a single channel where there is a variable, but generally asymmetric, power relationship between principal and agent, as exists in many franchise and agency channels. Trust was not affected directly by the level of power asymmetry, but rather the way power was used, either coercively or noncoercively raised or lowered trust. Trust was found to mediate the impact of the way power is used on the agent's perception of cooperation, satisfaction, and conflict, emphasizing the pivotal role of trust in understanding the behavioral aspects of channel behavior.