简介：Low-duty-cyclemechanismscanreducetheenergyconsumptionsignificantlyinwirelesssensornetworks(WSNs).Sensorsstaydormantmostofthetimetosavetheirenergyandwakeupbasedontheirneeds.However,suchatechnique,whileprolongingthenetworklifetime,setsexcessivechallengesforreducingtheend-to-end(E2E)delaywithinthenetwork.Inthispaper,thecentralizedcluster-basedlocationfinding(CCLF)algorithmisproposedtoreducethehighlatencyinlow-duty-cycleWSNsbyfindingasuitablepositionforthesink.Thealgorithmismainlycomposedofthreesteps:a)theclusterconstruction,b)thefastlook-uptable(FLU-table)construction,andc)thesinklocationdecision.ThesimulationresultsshowthattheperformanceoftheCCLFalgorithmissignificantlysimilartothatoftheoptimalalgorithm.Moreover,theCCLFalgorithmrequireslessoperationtimecomparedwiththeoptimalalgorithm.

简介：作为为一张PC类型纤维接头结束脸的最重要的几何参数之一，顶偏移量能贡献高插入损失和高背思考读物。为参数的一个新奇测量方法，接头旋转--方法，被建议。与方法，一张普通接头结束脸的顶偏移量被测量。结果与由北国3000纤维接头结束脸干涉仪测量了那相比。二结果之间的差别是1.8m，这被发现。同时，顶上的相关错误资源的影响在旋转下面抵消测量--方法和顶核心方法分别地被分析，并且二个错误方程被导出。分析结果看那，与顶核心方法相比轴在以内并且在对它的旋转引起的主要飞机垂直的指示的二另外的亚tilts是否不比原来的轴大倾斜角度，最大。测量错误然后将被至少22.5%与旋转减少--方法。方法的有实行可能被实验证实。

简介：TherehavebeenseveralmethodsfordeterminingTwave-end.ButnoneofthemcanovercomethedifficultyfrommultiformityofECGsignalpattern.Inthispaper,amethodfordeterminingTwave-endusingevolutionaryalgorithm(EA)isproposed.Inthisway,first,everycharacteristicparameterrelatedtoTwave-endisencodedtoastringofcodes,andadaptationfunctionisconstructedwiththestringofcodes.Thenchoosetheindividualaccordingtotheadaptationfunctionvalueanddogeneticoperation(reproduction,crossoverandmutation),soastoproduceoffspringwithmoreadaptationfunctionvalue.BecauseofEA'sautoadaptationandautoorganizationcharacter,itcantraceECGsignaltypeandfindtheTwave-endautomatically.ExperimentresultsshowthattheerrorratioofrecognizingTwave-endusingthismethodismuchsmallerthanthatusingexistingmethod.

简介：Athermalmodelofcrystalisestablished.Thetemperaturefielddifferentialequationofthediode-end-pumpedlasercrystalwithcircularcross-sectionandnewboundaryconditions,inwhichtheconvectionheattransferissupposedtoexistbetweenlasercrystalendsandair,isestablished.Theanalyticalexpressionsoftemperaturefield,thermaldistortionandadditionalopticalpathdifference(OPD)ofcrystalareobtained.Bynumericalcalculation,theinfluenceofheattransferonthethermaleffectsoflasercrystalNd:YAGisstudied.Resultsshowthatcrystal'sthermaleffects,includingtemperaturefield,thermaldistortion,OPDandthermalfocallength,areallweakenedastheheattransferthroughendsofcrystalisstrengthened.Thisconclusioncouldbeusedtocontrolthermaleffectsoflasercrystalandimprovelaserworkingstability.

简介：至于单个模式对称的步折射索引结构电介质平面光波导当它的产量结束被限制时，绕射的领域分发被导出。它能被表示为在迪拉克功能和Lorenz功能之间的卷绕旋转。加深限制衍射的识别是有用的。绕射的领域的特征被讨论。在中央明亮的穗对一半的半最大的紧张的完整的角度宽度的变化曲线裂缝的宽度被数字计算介绍，并且有指数的功能的恰当的曲线接近它。

简介：Alow-thresholdefficienthigh-repetition-rateeye-safeopticalparametricoscillator(OPO)ispresented.TheOPOisbasedonanx-cutnon-criticallyphase-matched(NCPM)KTAintra-cavitypumpedbyanacousto-optically(A-O)Q-switchedNd:YVO4laser.At10kHz,thelowestthresholdof0.75Wandthesignalpowerof0.6Waregot,correspondingtothesinglepulseenergyof60μJandthepeakpowerof20kW.Tuningthefrequency,themaximumoutputpowerat1536nmis1.03Wat30kHzwithanoptical-to-opticalconversionefficiencyof12.26%.Thefluctuationoftheoutputpoweris2.1%during2hoperation.