提高虚拟空间会议系统服务质量QoS的若干技术

虚拟空间会议系统是视频会汉系统发展的最高形式．本文结合作者研究工作，通过分析与视频会议系统服务质量相关的技术，提出了基于VST系统的相关技术策略，这些策略能够有效地提高VST系统的服务质量．     

The new route for realization of 1‐μm‐pixel‐pitch high‐resolution displays

A new pixel structure for the realization of a 1‐μm‐pixel‐pitch display was developed. This structure, named vertically stacked thin‐film transistor (VST), was based on the conventional back‐channel etched thin‐film transistor (TFT), but all the layers except the horizontal gate line were vertically stacked on the embedded data line, enabling the implementation of high‐resolution display panels. The VST device with a channel length of 1 μm showed a high field effect mobility of more than 50 cm²/Vs and low subthreshold slope of 78 mV per decade. It also shows a high uniform electrical characteristic over the entire 6‐in. wafer. The development of a new pixel architecture is expected to enable the implementation of 1‐μm‐pixel‐pitch high‐resolution displays such as spatial light modulators for digital holograms.     

DAATO_(3.5)与CMDB推进剂组分的相互作用及相容性

采用差示扫描量热法(DSC)和真空安定性实验(VST),对N-氧化3'3-偶氮双(6-氨基-1,2,4,5-四嗪)(DAATO_(3.5))与复合改性双基(CMDB)推进剂常用单组分之间的相互作用和相容性进行了研究。采用70℃推进剂固化实验,考察了DAATO_(3.5)与CMDB推进剂药浆多组分混合体系的相容性。DSC研究结果表明,DAATO_(3.5)与硝化棉(NC)、硝化甘油(NG)、奥克托今(HMX)、3,4-二硝基呋咱基氧化呋咱(DNTF)、铝粉(Al)、吉纳(DINA)、炭黑(C.B)和1,3-二甲基-1,3-二苯基脲(C2)之间没有明显的相互作用,相容性较好。DAATO_(3.5)与黑索今(RDX)和六硝基六氮杂异戊兹烷(CL-20)存在较为明显的相互作用;与间苯二酚(Res)之间存在强烈的相互作用,Res对DAATO_(3.5)的峰温没有影响但会显著改变DAATO_(3.5)的分解峰型;高氯酸铵(AP)对DAATO_(3.5)的分解峰温没有明显的影响;DAATO_(3.5)可使AP的起始分解温度从310℃降至275℃,并使AP的低温分解峰和高温分解峰合并成一个分解单峰,分解峰温较AP的高温分解峰温下降52.9℃。VST实验结果表明,DAATO_(3.5)与AP相容,与RDX属于中等反应,与Res不相容。推进剂固化实验结果表明,DAATO_(3.5)与CMDB推进剂多组分混合体系在70℃实际工艺条件下可以安全固化,形成的含DAATO_(3.5)的CMDB推进剂均匀致密,表明DAATO_(3.5)可应用于CMDB推进剂中。     

表面包覆后三硝基间苯二酚铅的热稳定性

通过差热分析、真空安定性试验、等温热失重试验和发火点测暄,考察了三硝基间苯二酚铅（ＬＴＮＲ）及包覆沥青或虫胶石墨后热稳定性的差别。结果表明,ＬＴＮＲ包覆２％虫胶及１．８％的石墨后,其热稳定性介于纯品ＬＴＮＲ和包覆２．７～４．５％沥青的ＬＴＮＲ之间。     

基于VST的电压稳定分岔分析

介绍了一种新颖的基于Matlab的电压稳定分岔分析工具包—电压稳定工具包(voltage stability toolbox,VST)。详述了该工具包用户友好图形接口界面和源代码开放的特点。基于数值和符号计算,该工具包采用Newton-Raphson和Newton-Raphson-Seydel的组合算法,旨在研究电力系统中的电压稳定和分岔问题,其主要功能包括潮流计算、分岔分析、奇异性和特征根分析、动态时域仿真等。VST非常有助于理解电力系统的电压稳定和非线性分岔现象,使用该工具对一个3机5节点系统和IEEE 30节点系统进行仿真,结果验证了该工具包用于电压稳定分析的实用性和有效性。     

Effect of organic eutectic on nitrocellulose stability during artificial aging

ABSTRACT

Recently, the eutectic composition of organic binary mixtures MENA+DPA has been found to be an efficient stabilizer of nitrocellulose. However, the behavior of such new stabilizer must be further investigated, especially after a long period of storage of the energetic composition. In this study, the stabilizing effect of the eutectic MENA+DPA on NC stability during artificial aging (at 338.65 K for 120 days), compared to its pure components, has been investigated by conventional stability tests and kinetic modeling. According to Bergmann & Junk (T = 405.15 K) results and over the entire period of aging, the eutectic MENA+DPA exhibits the best stabilizing effect on NC. The vacuum stability test (T = 353.15, 363.15, 373.15, and 383.15 K) results revealed that the amount of the evolved gas of NC containing this eutectic composition is very close to that of DPA, known as the conventional stabilizer. Furthermore, the kinetic modeling on VST data, obtained at four isothermal temperatures, was performed by two different methodologies, viz, fitting and free models to determine the kinetic triplets, which have been subsequently used to predict the storage lifetime for the studied systems. It was found that the NC stabilized by the eutectic MENA+DPA presents the highest value of the activation energy and has the longest storage lifetime during the entire heating period corroborating the stability tests results and affirming the excellent stabilizing effect of this mixture with respect to its pure component even if a long storage period is expected.     

NC/NG与ADN的相互作用

用高压差示扫描量热法(PDSC),热重-微商热重法(TG-DTG),研究了双基粘合剂(NC/NG体系)与二硝酰胺铵(ADN)之间的相互作用.结果表明,(NC/NG)/ADN体系中NG的分解峰由NC/NG中的207.0 ℃提前至159.8 ℃,在高压下该分解峰温提前至153.6 ℃.NC/ADN的分解峰温比NG/ADN提前了4.8 ℃,而且大部分的ADN没有被NG加速而提前分解,表明NC对ADN的作用比NG更强烈.此外,还用真空安定性试验(VST)评价了NC/NG与ADN的相容性,混合体系的净增放气量大于11 mL,属于严重不相容,证明在90 ℃下NC/NG与ADN之间也存在强烈的相互作用.     

新垂直筛板帽罩单元传质性能的测试与分析

根据新垂直筛板帽罩单元两相流动的实际情况，在新双池模型〔３〕的基础上提出了罩内外两段组成传质及其各段传质的模型。通过对帽罩效率的测定，得出了罩内外传质单元数的关联式。     

一致性场景下的边缘网络低时延存储算法

目前主流的边缘存储策略通过协同或非协同的方式来提高存储资源的请求命中率,从而降低请求延迟以满足时间敏感型业务的需求,然而这些策略并未考虑存储节点的副本数量过多所带来的一致性开销问题。提出一种基于虚拟传播树（VST）的边缘存储算法,针对边缘存储中的一致性开销问题,设计VST生成算法和节点淘汰算法,从而在副本数量高、一致性需求大的场景下实现可控低延迟服务。实验结果表明,该算法可以在一致性场景下提供低延迟服务,在非一致性场景下同样具有稳定的性能表现,请求时延和存储开销低于CV和NCV算法。     

HMX与RDX对TEX热安定性能的影响

采用真空安定性试验(VST)、布氏压力计法、5秒爆发点等实验方法对TEX以及TEX分别与HMX、RDX的混合物的热安定性进行了表征，并对其半衰期进行了理论推算，结果表明：TEX具有很好的热安定性能；RDX、HMX对TEX的热安定性能几乎无影响，彼此之间具有良好的相容性。