简介：对VPN（虚拟局域网）的基本概念，VPN的工作原理及实现VPN的关键技术-隧道技术进行了阐述，结合学校校园网的VPN实际解决方案，对VPN的配置及应用做了相应的描述。介绍了校园网的总体网络拓扑，在网络核心设备H3C-S7506的VPN配置，并描述了VPN在防火墙上的配置，以及VPN在高职校园网中的实际应用。

简介：文章主要介绍了4GL2TPVPDN技术和实现方案。对LTE和eHRPD两种网络模式下L2TPVPDN接入流程、业务配置进行了详细说明,对部署方案进行了探讨。最后结合某省实际部署情况对发现存在的一些问题进行了探讨和研究,并提出了相应的解决办法。

简介：文章研究了4GVPN业务L2TP鉴权认证的实现。友商VPN由用户路由器分配账号密码及IP地址,4GVPN业务无账号密码,APN和IMSI绑定,IP地址由运营商分配,用户希望能设置账号密码并分配自有IP地址,并实现友商和我司VPN并存。

简介：介绍了L2TP协议和IPSec协议的基本原理，分析了L2TP协议实现VPN时存在的安全问题，提出了一种将L2TP协议和IPSec协议相结合，利用IPSec为L2TP协议提供保护的安全隧道技术方案，并实现了基于IPSec的L2TP传输VPN实例.

简介：and evaluating the success of a particular strategy. They have an executive function. In O’Malley and Chamot framework of learning strategies,Oxford’s taxonomy fails to make a distinction between strategies directed at learning the L2 and those directed at using it (Ellis). The last problem is that compensation strategies are considered as a direct type of learning strategies rather than one type of production strategies,cognitive and social/affective. They grounded the study of learning strategies within the information-processing model of learning developed by Anderson. Metacognitive strategies involve consciously directing one’s efforts into the learning task. These strategies are higher order executive skills that may entail planning learning

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简介：Thispapercontainsadetailed,selfcontainedandmorestreamlinedproofofthel~2decouplingtheoremforhypersurfacesfromthepaperofBourgainandDemeterin2015.TheauthorshopethiswillserveasagoodwarmupforthereadersinterestedinunderstandingtheproofofVinogradov'smeanvaluetheoremfromthepaperofBourgain,DemeterandGuthin2015.

简介：摘要:本文主要介绍了台山核电站一期工程2#机组常规岛项目高压给水系统材质为TP304L的大口径厚壁不锈钢管道在安装过程中，通过一系列严格的焊接工艺措施和焊接操作技巧，有效地保证了管道安装焊接质量，对今后类似大口径厚壁不锈钢管道的焊接可提供良好的借鉴作用。

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简介：NineteenL-N-2-hydroxyethylaminoacidsandL-N,N-bis(2-hydroxyethyl)aminoacidswerepreparedfromthereactionofchlorohydrinwithL-alanine,L-valine,L-leucine,L-isoleucine,L-phenylalanine,L-serine,L-thrcunine,L-glutamicacid,L-asparticacidandglycine.L-N,N,N’,N’-tetra(2-hydroxyethyl)cystinewaspreparedbythereactionofL-cystinewithchlorohydrin.

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简介：Peerrevision,asupplementarystrategytoteacherrevisionofwritinginL2classroom,makespassivereceiversofteacherrevisionbecomeactiverevisers,enablingstudentstoinvolveinmoremotivatedlanguagelearning.Benefitsofpeerrevisionanditsimplicationsforteacherandstudentrolesarediscussed.Thisarticlealsotentativelyanalyzeswaysofpreparingstudentsforeffectivepeerrevision.

简介：本文代表着俄罗斯目前对世界新军事革命的看法和对21世纪战争特点的预测，认为所谓“非接触战争”的突出特点是“有选择打击的战争”，这是由以信息技术为核心的各种远程精确打击和精确制导武器的发展所决定的。

简介：在打造新一代数据中心的过程中,把应用系统从昂贵、封闭的UNIX平台迁移到经济、灵活的Linux平台（简称为U2L）,一直是近年来优化IT架构、推进IT变革的一项重要举措。时至今日,随着X86技术的成熟,虚拟化、并行计算及云计算的普及,节能减排呼声的高涨,以及戴尔、英特尔、红帽和VMware等开放技术厂商大力推动,U2L迎来了极好的发展时机，越来越多的企业和机构开始加大U2L力度，以此打造更为经济和高效的数据中心。

简介：ConsiderL2-projectionuhofuton-degreefiniteelementspaceonone-dimensionaluniformgrids.TwodifferentclassesoftheorthogonalexpansioninanelementforconstructingasuperclosetofunctionuhareproposedandthensuperconvergenceforbothuhandDuhareproved.Whennisoddandnoboundaryconditionsareprescribed,thenuhisofsuperconvergenceatn+1orderGausspointsGn+1ineachelement.Whennisevenandfunctionvaluesontheboundaryareprescribed,thenuhisofsuperconvergenceatn+1orderpointsZn+1ineachelement.Iftheotherboundaryconditionsaregiven,thentheconclusionsarevalidinallelementsthatitsdistancefromtheboundary≥ch|lnh|.Theaboveconclusionsarealsovalid.forn-dergreerectangularelementQ1（n）.

简介：面对城市拥挤、环保要求和经济压力,如今的消费者们将油耗作为购车时重要的考量指标。面对这个挑战,雪铁龙给出了令人震撼的答案——仅耗油2L/100km的雪铁龙全新C4CactusAirflow2L概念车在2014巴黎车展上正式亮相。

简介：　　Enantioimericallypure1,l'-bi-2-naphthol(BINOL)1anditsderivativesareimportantchiralligandsandauxiliariesforanumberofasymmetrictransformations1suchasaldolcondensations,alkylations,Diels-Alderreactions,Michaeladditions,epoxidations,etc.Opticallypure1andtheirderivativeshavealsobeenusedextensivelyinchiralrecognition,chiralseparationandintheconstructionoffunctionalisedmaterials2.Furthermore,(R)-and(S)-BINOLarealsofundamentalstartingmaterialsforthesynthesisofalargevarietyofotherchiralbinaphthylssuchasMOP(2c),NOBIN(2d)andBINAP(2e).Asaresultthedevelopmentofefficientandeconomicmethodsforthepreparationofopticallypure1hasattractedmuchattentioninrecentyears3andnovelmethodsfortheresolutionof(±)-1continuetobedeveloped.……

简介：identification and classification of learning strategy. The problems are reviewed concerning the definition and classification of learning strategies and then the paper tentatively introduces Cohen’s approach to defining learning strategies in terms of prototypicality of features of learning strategies.,Cohen’s attempt to describe the prototypicality of strategies is a step forward concerning defining learning strategies. It might reflect the nature of learning strategies to a large extent because the answers to the questionnaire come from strategy experts. It is true that some problems still exist. For example,all-or-nothing feature but in terms of how far along a continuum a feature could possibly go before it stopped being descriptive of a strategy. This is an approach of defining learning strategies in terms of how prototypical the feature was. These features as follows are arranged in a descending order of agreement

简介：10月13日,奥迪Q2L正式上市,共计推出5款车型,售价区间为21.77万~27.9万元。新车长宽高尺寸分别为4236mm、1785mm、1548mm,轴距为2628mm,国产版车型相比海外版本轴距加长了33mm。外观方面,奥迪Q2L采用的大嘴格栅边框棱角分明的风格让其看起来较为个性,同时下保险杠位置采用黑色塑料面板装饰增加了些许越野车硬派的印象。