杨木爆破浆作新闻纸配浆的初步研究

进行了杨木爆破浆配抄新闻纸的研究，杨木爆破浆取代马尾松化学浆配抄新闻纸后除撕裂度略有下降外，裂断长、拉毛速度、印刷密度、透印值等都有明显改善     

Cr、Co、Mn磁性对ZnO压敏特性影响的机理研究

研究了不同浓度Cr、Co和Mn的掺杂对ZnO-PbO-B2O3陶瓷压敏特性的影响.实验表明,ZnO平均晶粒尺寸随各元素掺杂量增加而逐渐变大,压敏电压也随之升高,非线性系数随各元素掺杂量增加而先增大后减小,漏电流先减小后增大.分析认为,过渡族金属元素掺杂对ZnO压敏材料电性能的影响不仅与电子的能级有关,与其自旋特性也紧密相连.ZnO中掺杂的Cr、Mn、Co元素随机取代其中的部分Zn原子后,Cr2+、Mn2+、Co2+在ZnO中产生局域磁矩,会对与其取向不同的自旋电子产生强的散射,这样可增大ZnO陶瓷电阻率和提高其非线性特性.     

Power consumption analysis of video streaming in 4G LTE networks

Video streaming, one of the most popular technologies for online video playback, has already been applied to 4G LTE networks. Previous work has been devoted to understanding the power consumption in general 4G LTE networks, while it is still unclear how the online video streaming makes impact on the power performance of mobile devices. Inspired by this, this paper investigates the relationship between the mobile device’s power performance characteristics and the behaviours of video streaming in 4G LTE networks. There are many natural issues/questions that are clearly interesting and important, while it is non-trivial to answer these issues/questions exactly (e.g., where is the energy saving room? how much is it?). To address a series of issues like the above, we formulate our energy models together with an algorithm that can assist our analysis. Particularly, we design a systematic platform, and conduct a comprehensive and also deep analysis on the power consumption of video streaming in 4G LTE networks. Our experiments reveal us a series of valuable findings—the saving room in the network part is large (from 41.86 to 69.62%), the number of RRC tails and the transmission pattern could be promising for optimizing the power consumption, for example.     

注入条件对SIMOX材料的影响

利用ＲＢＳ和ＴＥＭ技术分析研究了不同注入剂量、注入方式（单重注入，多重注入）对ＳＩＭＯＸ材料各层结构的影响，特别着重研究了Ｓｉ／ＳｉＯ２界面过渡区受注入条件的影响。结果表明，在注入剂量相同的情况下，多重注入不仅能改善顶层单晶、ＳｉＯ２绝缘层的质量，而且能显著减小Ｓｉ／ＳｉＯ２界面过渡区宽度。     

Study and formation of 2D microstructures of sapphire by focused ion beam milling

Dry etching of C-plane sapphire wafer has been studied using Ga⁺ focused ion beam milling (FIBM). Due to a much lower milling rate of sapphire compared to GaN, it has been proven that gas-assisted FIBM (GAFIBM) is a necessity. Furthermore, it needs to be determined whether XeF₂- or I₂-GAFIBM can improve the technique. We found that XeF₂-GAFIBM gave the highest milling rate. The obtained enhancement factor of the XeF₂-GAFIBM milling rate compared to FIBM rate varied from 2.3 to 1.2 for the ion beam current in the range 20 pA-1 nA. A favorable milling rate selectivity of sapphire to nickel film of about 1.5 was obtained by XeF₂-GAFIBM at 350 pA. We have successfully fabricated a variety of 2D sapphire-based submicron pillar or hole arrays in regular crystals, quasicrystals and aperiodic symmetries. The nearest neighbor distance was down to 230 nm. The depth achieved was deeper than 400 nm. The air filling factor ranged from 12% to 60%. These sapphire-based 2D microstructures were applied on flip-chip GaN-based light emitting diodes (LEDs) and more than 40% improvement in light extraction was obtained.     

Cyanate Ester-Based Encapsulation Material for High-Temperature Applications

Cyanate ester resin-based composite materials have been proposed as potential encapsulants for high-temperature applications. The objective of this study is to develop a cyanate ester-based encapsulant, which can also serve as a flip-chip underfill as well as for traditional encapsulation. Two different materials, quartz and alumina fillers, have been studied. The impact of shapes and sizes of the fillers on the overall thermomechanical properties has been investigated. The adhesion strengths of the materials to the ceramic substrate, Kovar lid, and silicon die have also been characterized. The modulus of the resin and the shape of the fillers play a pivotal role in minimizing thermal stress, generated by coefficient of thermal expansion mismatches. Smaller filler particles were found to have better adhesion to the cyanate ester resin. The high-temperature performance of the cyanate ester-based encapsulants was evaluated by thermal aging at 300°C for up to 500 h.     

场面监视雷达设备监控与状态采集系统的研发

机场场面监视雷达是专门用于对机场场面上移动的飞行器和机动车辆进行监视的设备,目前在我国的北京国际机场、上海浦东国际机场、广州新白云国际机场都有应用。本文主要对丹麦Terma公司生产的场面监视雷达的监控数据通信协议进行研究,在此基础上采用C#编程语言实现针对该设备的监控与状态采集终端的开发。文中的研发思路对民航空管同类型设备的监控与采集系统的研发有一定的借鉴作用。     

Magnetic field spatial Fourier analysis: A new opportunity for high resolution current localization

Magnetic microscopy has proven its usefulness throughout the years. It allows current localization with a certain degree of precision by using an inversion algorithm to invert the Biot–Savart law. The goal is to obtain the current distribution once the magnetic field is given. However, in order to obtain a stable solution, the magnetic data is severely low-pass filtered in the spatial Fourier domain, and some important information is lost. In this paper, the contribution given by the different spatial frequencies was studied: it was demonstrated how this information can be used to obtain additional information regarding the position of the currents. A comparative study between the theoretical approach and the application to the measurements is also shown.     

基于网络粘黏的竞争力扩散效应

网络企业的扩张表现出有别于传统行业的特殊性。以腾讯公司为背景,利用网络粘黏解释网络企业的竞争力扩散效应。研究发现,腾讯借助已有的即时聊天工具QQ积累了大量粘黏度很高的网络用户,借此开展多项网络服务业务,形成良好赢利模式。研究认为网络企业只有在拥有核心业务之后,利用网络粘黏效应培养具有竞争力的多元业务,才能真正实现成功的网络多元化经营。网络粘黏下的竞争力扩散效应研究对腾讯这一类网络企业扩张提供了理论解释,并且丰富了网络行为研究,具有一定的理论与现实意义。