面向电信承载网的监控系统设计与实现

面对电信承载网连接的日益增长的海量终端设备，运营商需要结合网络拓扑对终端设备产生的数据进行高效的汇聚统计、异常分析、故障定位处理等操作。针对已有系统存在的操作困难、分析效率低等问题，设计与实现了一个面向电信承载网的高效监控系统，提供实时与离线数据分析和多维可视化分析的能力。对网管、认证、终端等系统及设备采集的数据进行结构化存储，对采集的数据进行拓扑相关性和时间序列方法分析，根据分析结果实现基于动态阈值控制的异常实时告警、定位等操作，并提供多维度可视化分析对网络状态进行实时监控。实际应用结果表明，该系统性能优异，具有良好交互性，能较好地满足承载网运维人员业务分析需求。     

Two-step method to deposit ZrO2 coating on carbon fiber: Preparation,characterization, and performance in SiC composites

Recently, ceramic matrix composites reinforced by short carbon fibers (CFs) attracted increasing attentions. To further improve mechanical properties and oxidation resistances, CFs were subjected to oxidation and acidification followed by sol-gel dip-coating to deposit ZrO₂ on their surfaces. ZrO₂-C_f/SiC composites were fabricated by joint hot compression molding and sintering, compared to C_f/SiC and SiC prepared by the same method. Microstructural analyses indicated that ZrO₂ coatings were successfully deposited on CF surfaces, formed strong bonding and interfaces between CF and the matrix. Meanwhile, CFs were found uniformly distributed in SiC matrix with random orientations. Flexural curves of ZrO₂-C_f/SiC and C_f/SiC revealed the presence of “false plasticity” regions after sharp drops, which were quite different from brittle flexural behavior of SiC ceramic. Compression strength of the three samples showed step-up growth. ZrO₂-C_f/SiC exhibited the highest value, indicating the introduction of CFs and ZrO₂ coatings do have great influence on mechanical performances. After heat treatment, ZrO₂-C_f/SiC exhibited better oxidation resistance than C_f/SiC, with weight loss ratios estimated to ??3.76% and ??6.43%, respectively. These improved properties indicated that ZrO₂-C_f/SiC would be excellent alternatives to other existence materials under ultra-high temperature environments.     

一种高精度的非平稳随机信号实时建模算法研究

针对传统的非平稳随机信号时变参数筹分模型算法的不足,论文把非平稳随机信号时变参数差分模型与一种带自适应遗忘因子的RLS算法结合起来,形成一种有效的非平稳随机信号实时建模算法,仿真分析表明该算法不仅能获得快的收敛速度而且能获得高的建模精度。     

乙烯-1-辛烯共聚物增韧应用研究

介绍了聚烯烃系弹性体（POE）的特点及其在PP增韧改性中的应用，同时还报道了马来酸酐接枝的POE在极性聚合物复合体系中的应用研究。     

风机盘管在空调工程中的应用及分析

根据风机盘管的特性，分析了设备运行状况和能量调节方法等方面的有关问题，指出了风机盘管采用变风量的方法调节能量所存在的弊端，同时还分析了在空调设计中，如何充分运用这些特点来合理选型，并对产品开发方面提出了建议。     

A framework for investigating radio resource management algorithms in TD-SCDMA systems

TDD-CDMA, globally recognized as the basis for Chinese 3G, is designed for symmetrical and asymmetrical 3G mobile services. As a time-division duplexing system, TD-SCDMA works in unpaired frequency allocations, supporting the flexible allocation of uplink/downlink slots in one carrier, and adapting to the different system loads between uplink and downlink. Dynamic time slot allocations make it more spectrally efficient than paired uplink/downlink carriers. Consequently, TD-SCDMA can make full use of the radio spectrum through optimal adaptive radio resource allocation. In order to support peak rates of 5 Mb/s or higher, the TD-SCDMA standard is enhanced via high-speed downlink packet access (HSDPA) mode. In this article the properties and strategies of radio resource management (RRM) are introduced, and the differences in admission control, power control, handover, load control, dynamic channel allocation, and adaptive HSDPA techniques between TDD-CDMA and the conventional FDD-CDMA system are analyzed. Some advanced strategies and architectures for TDD-CDMA RRM algorithms are presented. Since uplink multi-user detection (MUD) and smart antenna (SA) techniques are adopted in TD-SCDMA, the RRM algorithms based on MUD and SA are investigated further. In addition, these advanced RRM algorithms are characterized by an OPNET-based dynamical system-level simulator.     

五自由度串联机器人手部特殊的转动自由度

应用反螺旋理论，讨论了当反螺旋理个ｈ≠０旋量时，允许转动轴线在空间分布规律。着重地五自由度串联机器人Ｍｏｔｏｍａｎ的运动性质作出分析，且给出其全部５种不同条件下的运动图谱。     

ROSA:资源敏感的高性能Web容器体系结构

现有的Web容器多采用线程池体系结构,而Web容器所支撑的动态Web组件在执行过程中可能需要获取多种共享资源,由共享资源并发量限制导致的线程阻塞可能会严重影响性能。提出了一种资源敏感的Web容器体系结构ROSA(resource-oriented staged architecture)。当某些共享资源达到饱和时,若Web容器接到对需要这些资源的Web组件的请求,ROSA会暂缓为这些请求提供服务以减少线程阻塞。基于排队Petri网,建立了ROSA结构和线程池结构的性能模型,通过模型仿真和负载实验验证了ROSA体系结构的性能优势。     

Diffusion bonding between nickel-base superalloy K24 and heat-resisting steel 1Cr11Ni2W2MoV

IntroductionSLlperalloyandheat-resistingsteelarenowwidelyusedasstructurematerialsinaerospace,a\-lationalldshipbuildingindustries.Nickel-basesuperalloywasfirstlyrevealedasanengineeringmaterialduringtheearly1960swhenitwasrecognizedasbeingsuitableforllledium-temperaturegasturbinel'l.Now.nickel-basesuperalloyhasbeenpracticallyusedinhigheffectiveturbinestosatisfytheincreasingdemandsforhighertemperatureenvironmentsIZI.Insomeaerospaceengines,theimpellersshouldserveattemperatureof1000C~1100C,andala…     

双活性基活性染料真丝绸染色工艺研究

双活性基活性染料用于真丝绸染色有诸多影响因素：缚酸剂用碳酸氢钠比碳酸钠的固色率高用量在2％～4％，pH为8～9时最为合适：染色温度从60℃升到85℃时固色率提高3％～8％，超过85℃时易造成“灰伤”．当元明粉的用量从30g／l升到60g／l时上染率和固色率提高10％。随着浴比的增加，其固色率会有不同程度的降低，在实验条件下，浴比为1：40最好。通过上染曲线，讨论了染色过程的控制。