基于SDN的高校数据中心网络设计

软件定义网络SDN（Software-Defined Network）,或称软件驱动网络SDN（Software Driven Networks）是目前数据中心建设的一个很重要的热点技术,它将网络的控制平面和数据平台相分离,为数据中心的网络控制提供了一种全新的解决方案。对SDN的架构进行了分析,对比了不同的SDN/Overlay覆盖技术实现方法,重点介绍了覆盖（Overlay）方案在控制平面的思路和overlay网络如何与传统网络互通的方法。最后探讨了SDN是未来数据中心的发展趋势。     

多级VPN技术在疫情直报网络中的应用

随着传染病网络直报的不断发展和关键业务不断增加,对传染病网络直报系统的安全性、可靠性、实时性提出了新的严峻挑战。本文分析了构建武汉市疾控系统VPN网络的背景及整体构架,阐述如何利用IPSEC VPN和SSL VPN技术构建国家、省、市、区疾控系统VPN网络的方法,真正实现资源共享和"一网多用"。     

Solid polymer electrolytes. XI. Preparation,characterization and ionic conductivity of new plasticized polymer electrolytes based on chemical‐covalent polyether–siloxane hybrids

A new hybrid polymer electrolyte system based on chemical‐covalent polyether and siloxane phases is designed and prepared via the sol–gel approach and epoxide crosslinking. FT‐IR, ¹³C solid‐state NMR, and thermal analysis (differential scanning calorimetry (DSC) and TGA) are used to characterize the structure of these hybrids. These hybrid films are immersed into the liquid electrolyte (1M LiClO₄/propylene carbonate) to form plasticized polymer electrolytes. The effects of hybrid composition, liquid electrolyte content, and temperature on the ionic conductivity of hybrid electrolytes are investigated and discussed. DSC traces demonstrate the presence of two second‐order transitions for all the samples and show a significant change in the thermal events with the amount of absorbed LiClO₄/PC content. TGA results indicate these hybrid networks with excellent thermal stability. The EDS‐0.5 sample with a 75 wt % liquid electrolyte exhibits the ionic conductivity of 5.3 × 10^?3 S cm^?1 at 95°C and 1.4 × 10^?3 S cm^?1 at 15°C, in which the film shows homogenous and good mechanical strength as well as good chemical stability. In the plot of ionic conductivity and composition for these hybrids containing 45 wt % liquid electrolyte, the conductivity shows a maximum value corresponding to the sample with the weight ratio of GPTMS/PEGDE of 0.1. These obtained results are correlated and used to interpret the ion conduction behavior within the hybrid networks. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 1000–1007, 2006     

结合注意力机制与BIM特征的电力能耗预测

能耗预测中引入外因序列有助于目标序列的预测,但在实际应用中各个外因序列与目标序列之间的相关程度往往不清晰,导致无法有效利用多外因序列辅助预测.针对该问题,提出一种结合注意力机制与BIM特征的电力能耗预测模型——BIMAttenNN(BIM Attention Nerual Network).通过结合注意力机制与BIM特征对外因序列自动选取并重构,将重构特征通过编码器-解码器结构的深度神经网络和线性回归分支准确预测未来电力能耗.实验结果表明,BIMAttenNN能够结合BIM特征自动捕捉电力序列间关系,与传统方法相比具有更高的预测精度.     

Corrosion mechanism and corrosion model of Mg-Y alloy in NaCl solution

Corrosion of Mg–Y alloy was studied using electrochemical evaluations, immersion tests and SEM observations. Corrosion mechanisms of Mg-(0.25 and 2.5) Y alloy and Mg-(5, 8, and 15) Y alloy were uniform corrosion and pitting corrosion respectively, and the content of Mg_(24)Y_5 phases determined its effect acting as cathode to accelerate the corrosion or corrosion barrier to inhibit the corrosion. Corrosion resistance of Mg-(0.25, 2.5, 5, 8, and 15) Y alloys was as follows: Rt(Mg-0.25Y) Rt(Mg-8Y) Rt(Mg-15Y) Rt(Mg-5Y) Rt(Mg-2.5Y). Y could significantly improve the corrosion resistance of the Mg-Y alloy, but the excess of Y deteriorated the corrosion resistance of the Mg-Y alloy. The optimum content of Y in the studied alloys was 2.5%.     

培养面向新形势的保密人才队伍

保密人才队伍建设工作是做好保密工作的一项重要基础性工作.培养面向新形势的保密人才队伍,是现阶段保密工作科学发展的客观要求.本文总结了保密人才队伍培养的意义和工作原则,分析了分类培养方式,对当前存在问题及相关对策进行了积极探讨,以期为保密人才队伍培养工作提供借鉴和参考.     

分布式病房监测装置的设计

为了减轻医务人员的负担和保证病人的安全,设计了一种分布式病房监测装置。该装置以无线通讯技术、光线折射/散射原理为基础,实现病房输液监测的自动化和智能化。红外发射器(IR908)发射的红外线透过输液管,被红外接收器(PT908)接收,由于输液管中的药液变化会改变接收光线的强弱,引起红外接收器的电压变化,最后单片机对红外接收器的电压进行判断。实验结果表明:该装置结构简单、可靠性高、成本低廉,且能实现长时间的自动监测。     

Growth characteristics and kinetics of niobium carbide coating obtained on AISI 52100 by thermal-reactive diffusion technique

Niobium carbide coating was produced by thermal-reactive diffusion technique on AISI 52100 steel in salt bath at 1 123 K, 1 173 K, and 1 223 K for 1, 2, 4, and 6 hours. The salt consisted of borax, sodium fl uoride, boron carbide, and niobium pentoxide. The presence of NbC phase on the steel surface was confi rmed by X-ray diffraction analysis. Microscopic observation showed that niobium carbide coating formed on the substrate was smooth and compact. There was a distinct and fl at interface between the coating and substrate. The micro-hardness of niobium carbide coating was 2892±145HV. The thickness of coating ranged from 1.6 μm to 14μm. The forming kinetics of niobium carbide coating was revealed. Moreover, a contour diagram derived from experimental data was graphed for correct selection of process parameters. Some mathematical equations were built for predicting the coating thickness with predetermined processing temperature and time. The results showed that these mathematical equations are very practical as well as the kinetics equation.     

知识开源化背景下信息安全类课程教学改革初探

本文针对当前知识开源化的现状,结合信息安全类相关课程在北京电子科技学院授课的实际情况,以利用知识开源化所带来的优势,改善课程的教学效果、提高学生的动手实践能力为目的,研究和探讨了信息安全类部分课程的教学模式改革方式和所取得的效果。     

中国油气勘探开发新进展与前景展望

近年来,石油企业不断推进油气增储上产,加大投资力度,增加工作量,强化油气勘探和产能建设,取得超预期进展与成效。2019年以来,全国勘探新发现亿吨级油田和新增储量亿吨以上油田共7个,新发现和新增储量千亿立方米以上气田8个,新发现亿吨以上陆相页岩油田2个,实现了深层页岩气、深层煤层气勘探的战略性突破,落实了万亿立方米深层页岩气区,发现了大型浅层页岩气田;全国年均新增探明石油地质储量13.61×108t,年均新增常规天然气探明地质储量约8867×108m3;2022年,石油产量增至约2.05×108t,时隔6年重回2.0×108t以上,天然气产量增至约2178×108m3,超预期完成了油气增储上产阶段性目标任务。基于油气资源潜力分析,近中期,国内油气勘探开发将延续近4年增储上产发展态势,油气新增储量保持高位增长,石油产量在高位实现稳中有增,天然气产量实现较快增长;中长期看,油气探明储量有望较长时期保持高位增长,石油产量将在高位中逐步下行但有望长期稳定在2.0×108t以上,天然气将较长时间增产,2035年预计达到（3300~3500）×108m3,国内油气生产供应能力总体持续提升。要将前景展望变为现实,既需要企业积极应对挑战,保持加大油气勘探开发力度的战略定力,更需要国家层面的政策引导和支持,营造有利于油气增储上产的政策环境。