On lovering's active RC network

It is seen that with an alternative type of functional decomposition, Lovering's network can be used to realize arbitrary transfer impedances and current transfer functions in addition to voltage transfer functions and transfer admittances. It is also seen that by generalizing the network, it is possible to synthesize arbitrary voltage transfer functions, current transfer functions, transfer impedances, transfer admittances or driving-point admittances by using less complicated functional decompositions.     

卫星导航时间传递性能的分析与比较

卫星导航系统本身具有时间传递性能,其时间传递技术包括接收机单点定位授时、两站点卫星共视和基于差分技术的相对时间同步,为分布式电子信息系统的固定站点和运动平台间的时间同步提供了高精度的时间同步手段。本文针对卫星导航多种时间传递模式的原理和性能展开分析,对GPS、GLONASS、GALILEO和Compass的时间传递性能进行对比分析。利用两套具有多系统多星座共视的载波相位时间传递技术的时间传递设备开展了长基线时间传递试验,试验结果表明利用卫星导航能够实现的1000km长基线时间传递的最佳精度可达5ns。     

高速串行传输在雷达波控系统中的应用

针对相控阵雷达波控系统的特点 ,介绍了一种基于CY7B92 3 /93 3芯片的高速串行传输接口 ,以往的RS 485、RS 42 2传输模式 ,由于其传输速率太低已不能满足系统的要求 ,而高速串行传输方式具有上百兆的传输速率及高稳定可靠性等特点 ,将在波控系统的信号传输设计中广泛应用。文章详细分析了这组高速传输芯片的内部结构、传输机理及几种工作方式的比较 ,并讨论了这种传输方式在相控阵雷达波控系统数据传输接口中所具有的有效减少阵面走线 ,提高波束转换时间的优势     

Computationally Secure Oblivious Transfer

We describe new computationally secure protocols of 1-out-of-N oblivious transfer, k-out-of-N oblivious transfer, and oblivious transfer with adaptive queries. The protocols are very efficient compared with solutions based on generic two-party computation or on information-theoretic security. The 1-out-of-N oblivious transfer protocol requires only log N executions of a 1-out-of-2 oblivious transfer protocol. The k-out-of-N protocol is considerably more efficient than k repetitions of 1-out-of-N oblivious transfer, as is the construction for oblivious transfer with adaptive queries. The efficiency of the new oblivious transfer protocols makes them useful for many applications. A direct corollary of the 1-out-of-N oblivious transfer protocol is an efficient transformation of any Private Information Retrieval protocol to a Symmetric PIR protocol.     

Incomplete transfer in charge-transfer devices

The authors present a general analysis of incomplete charge transfer in charge transfer devices. By using a lumped-charge model to characterize the dynamics of the charge transfer, they calculate /spl alpha/, the small-signal coefficient of incomplete transfer, in terms of single-device small-signal parameters. They show that three contributions to incomplete transfer are common to all charge-transfer shift registers: an intrinsic transfer rate contribution, an output conductance or feedback contribution, and a storage-capacitance modulation contribution. The analysis suggests that most relevant measurements necessary to characterize incomplete transfer can be made on a single cell of a shift register that has input and output diffusions. This allows transconductance etc., to be measured on a small-signal basis as a function of transfer current, from which one can calculate transfer efficiencies. An analysis of the influence of interface states which may be important for some charge transfer devices, is also included.     

备用发电机组的接地和中性线的转换

分析了传统的采用3极转换开关的转换电路存在的问题；介绍了采用4极转换开关的转换电路；最后提出了关于备用发电机组接地和转换开关选择的建议。     

优化传输栅下电势分布改善四管像素的电荷转移效率

提出了一种通过优化传输栅下沿电荷转移路径的电势分布来提高电荷转移效率的方法。通过使用非均匀掺杂传输管沟道,形成了传输管沟道内部的电势分布梯度。通过对R1区与传输栅的交叠长度,R1区的掺杂剂量,防穿通注入（APT）与传输栅交叠长度的调整,减小了传输管沟道与箝位光电二极管（PPD）连接区域的电子势垒与电子势阱,增强了二者的电势连接。仿真结果显示,剩余电荷占总电荷的比例由1/104减小至1/107,转移时间由500 ns缩短为110 ns。这意味电荷转移效率得到了提高。     

离焦量对高强钢激光填丝焊熔滴过渡特性的影响

为了研究离焦量对激光填丝焊熔滴过渡及相关特征的影响，获得稳定过渡模式，借助高速摄像系统观察了不同离焦量下的熔滴过渡行为，并将其分为液桥过渡、混合过渡和滴状过渡3种类型进行了分析。结果表明，离焦量为-1mm和+3mm时的液桥过渡模式可以保证焊接过程的稳定性，获得的焊缝质量良好，焊缝截面无气孔等缺陷；而离焦量为+5mm时的过渡模式为滴状过渡，此时焊接稳定性最差，焊接过程中匙孔会完全闭合，焊缝表面成形不规则，焊缝截面底部出现大的气孔。该研究结果对实际生产有指导作用。     

冷壁面自然对流热质传递研究

为了得到蓄冰槽冷壁面在自然对流工况下的降温除湿特性以及环境温湿度、壁面形式和辐射对冷壁面传热传质的影响,建立了冷壁面自然对流传热传质二维模型,基于MATLAB采用控制容积法和连续性方程与动量方程联立的SIMPLE方法进行求解,并搭建试验台对此模型进行验证。结果表明:热质传递过程中,对流传热起主要作用,随着环境温湿度的增加,对流传热、传质和辐射传热都增大,但传质增加最快,在总换热量中所占比例也逐渐增大,壁面竖直和朝下的热值传递速度远快于壁面朝上,数值模拟结果与实验值拟合良好。研究结果可为蓄冰槽的自然降温除湿系统的应用提供参考。     

Distinguishing between knowledge transfer and technology transfer activities: the role of key organizational factors

Knowledge transfer and technology transfer are often used interchangeably and while both knowledge transfer and technology transfer are highly interactive activities, they serve different purposes. Knowledge transfer implies a broader, more inclusive construct that is directed more toward understanding the "whys" for change. In contrast, technology transfer is a narrower and more targeted construct that usually embodies certain tools for changing the environment. Grounding our work in the 7-S framework, we examine the role of key organizational factors in facilitating knowledge transfer and technology transfer activities. Survey data for this study were collected from 189 industrial firms representing 21 different industrial sectors. Results show that there are differences in the types of firm structures, cultures and university policies for intellectual property rights (IPR), patent ownership, and licensing that facilitated knowledge transfer activities compared to those that facilitated technology transfer activities. Specifically, firms with more mechanistic structures and more stable direction-oriented cultures were associated with higher levels of knowledge transfer. Conversely, firms with more organic structures, more flexible change-oriented cultures, and more customized university policies for IPR, patent ownership, and licensing were associated with higher levels of technology transfer. The firm's trust in its university research center partner was equally important for both activities. We conclude by discussing the implications of our findings for future research and management practice.     

Mean Relative Intensity Noise Transfer in Fiber Raman Amplifiers Using Multiple-Wavelength Pumps

We present a numerical analysis of mean relative intensity noise (RIN) transfer in a fiber Raman amplifier (FRA) using multiple-wavelength pumps. For the first time, the RIN transfer is investigated to include pump-to-pump and signal-to-signal RIN transfers, together with the ldquotraditionalrdquo pump, to signal transfer in a multiple-wavelength pumped FRA. We show that for a multiple-wavelength pumped FRA, pump-to-pump and signal-to-signal RIN transfers induce an increase of RIN transfer magnitude. For a multiple-wavelength counter pumped FRA, in additional to the major pump to signal RIN transfer, pump-to-pump RIN transfer is considerable, and signal-to-signal RIN transfer is very small. For a multiple-wavelength co-pumped FRA, both pump-to-pump and signal-to-signal RIN transfers increase RIN transfer magnitude significantly. In addition, for both a co- and counter pumped FRAs, particularly for the co-pumped FRA, the longer wavelength signals experience more RIN transfer than the shorter wavelength signals. Furthermore, the bandwidth of RIN transfer is significantly increased in a multiple-wavelength co-pumped FRA with multiple input signals compared to a single-wavelength co-pumped FRA with an input signal.     

场协同理论应用于强化换热技术的研究进展

概述了场协同理论应用于有源强化技术、无源强化技术以及复合强化技术的研究现状,分析了场协同理论用于分析质传递过程的研究进展,指出可以通过增加外场来提高蒸发冷却过程中质传递的效率。     

Keil C51中C51程序与汇编程序的接口方法

C语言程序与汇编语言程序的相互调用可视为函数的调用,只不过此函数是采用不同语言编写。在C和汇编程序的相互调用中,要求汇编程序必须服从Keil C51中对函数名的转换规则,同时也要弄清C函数的参数传递规则,通过实例详细介绍Keil C51中C51程序与汇编程序相互调用以及汇编程序与C51程序相互调用时的接口建立方法,并给出在不同的应用中对接口进行简化的方法。     

Direct Graphene Transfer and Its Application to Transfer Printing Using Mechanically Controlled,Large Area Graphene/Copper Freestanding Layer

Direct graphene transfer is an attractive candidate to prevent graphene damage, which is a critical problem of the conventional wet transfer method. Direct graphene transfer can fabricate the transferred graphene film with fewer defects by using a polymeric carrier. Here a unique direct transfer method is proposed using a 300 nm thick copper carrier as a suspended film and a transfer printing process by using the polydimethylsiloxane (PDMS) stamp under controlled peeling rate and modulus. Single and multilayer graphene are transferred to flat and curved PDMS target substrate directly. With the transfer printing process, the transfer yield of a trilayer graphene with 1000 µm s^?1 peeling rate is 68.6% of that with 1 µm s^?1 peeling rate. It is revealed that the graphene transfer yield is highly related to the storage modulus of the PDMS stamp: graphene transfer yield decreases when the storage modulus of the PDMS stamp is lower than a specific threshold value. The relationship between the graphene transfer yield and the interfacial shear strain of the PDMS stamp is studied by finite‐element method simulation and digital image correlation.     

时间传递技术综述

随着技术的不断发展，对时间精度的要求越来越高，而时间传递技术往往成为时间统一的瓶颈问题。针对这一现状，本文对时间传递技术进行简要介绍，阐述了单向时间传递及双向时间传递的技术特点，并介绍了几种常用时间传递技术的基本原理、应用场景、实现方式、技术指标等。     

综合监控系统控制权移交的设计与实现

本文介绍了在轨道交通综合监控系统（ISCS）中如何进行控制中心和车站之间的内部权限移交,以及ISCS与外部系统之间的外部权限移交。权限移交有两种方式：正常权限移交和强制权限移交。结合实际工程需求,针对BAS子系统设计了控制权移交的方案及实现方法。实践表明,该方案能够满足需求,保证控制的唯一性,使得操作员在控制中心、车站、子系统均能对受控对象进行安全的控制操作。     

辐射特性测量大气传输修正研究:大气辐射传输模式和关键大气参数分析

工作于大气中的光电测量（或遥感）设备接收的目标辐射信号受大气衰减和大气背景辐射影响。大气传输修正是目标辐射特性测量的一个重要环节。介绍了目前国际上实用的大气辐射传输计算模式及影响大气传输的重要大气光学参数的探测方法。对影响红外波段大气传输的重要大气光学参数作了分析,论证了辐射测量大气传输修正系统必须测量的大气参数。     

A new accelerated transfer method for the CPD image sensor

A new charge transfer method for the CPD image sensor is proposed. In this method a high transfer speed is achieved with the use of an accelerated charge priming transfer (CPT) coupler, which consists of the array of the conventional CPT's and inverter amplifiers. This constitution strikingly increases the speed as well as the efficiency of the charge transfer from the vertical transport lines with large capacitance to the horizontal buried-channel charge-coupled (BCCD) shift register. Under a high transfer efficiency of more than 98 percent, a short transfer time less than 1 µs has been attained, independently of the signal charge magnitude.     

RIN transfer measurement and modeling in dual-order Raman fiber amplifiers

A numerical analysis is presented that models the transfer of relative intensity noise (RIN) from the first- and second-order pump lasers to the signal radiation in dual-order Raman fiber amplifiers. Measurements are presented of the first- and second-order RIN transfer functions for co- and counter-propagating fiber amplifiers. The second-order RIN transfer function is similar to that found in single-order Raman fiber amplifiers and the first-order transfer function is approximately 15 dB less than the second-order transfer function. The impact of the RIN transfer from the first- and second-order pump lasers to the signal radiation on the system performance is examined and estimates for the required pump laser RIN levels are presented.     

一种研究电磁波在分层介质中传输的新方法

利用电磁波在界面的边界条件,推导一种研究电磁波在分层介质中传输的新方法——传输矩阵法,并将传输矩阵法与经典的特征矩阵法作了比较。得出：传输矩阵法不仅能够解决特征矩阵法所能解决的全部问题,而且还能够解决特征矩阵法所不能解决的问题。因此传输矩阵法是一种比特征矩阵法更基本、应用范围更广的新方法。