简介：The(2+1)-dimensionalBKPequationintheHirotabilinearformisstudiedduringthiswork.WronskianandGrammiantechniquesareappliedtotheconstructionofWronskianandGrammiansolutionsofthisequation,respectively.ItisshownthatthesesolutionscanbeexpressedasnotonlyPfaffiansbutalsoWronskiansandGrammians.

简介：ThecaptureoforthophosphatesandtotalphosphorusfromthePudongCanalriverinthePudongDistrictofShanghaibyTiO2nanoparticlesisstudiedusingarotatingphotoreactorandthenano-TiO2photocatalystDegussaP25.TheeffectsofUVirradiationintensityinarangeof20-74mW/cm2.theloadingoftheTiO2nanoparticlesinarangeof0.05-0.1g/L,irradiationtimeupto4h,andpHvaluesinarangeof2-10.5onthecaptureefficiencyareinvestigated.TheresultsshowthatthecaptureoforthophosphatesandtotalParesignificantlyenhancedbyUVirradiation;ataloadingof0.1g/Landanirradiationintensityabove36mW/cm2,orthophosphatesandtotalphosphorusarerapidlycapturedbyTiO2nanoparticles,causinganobservedreductionfrom0.4mg/Ldownto0.02mg/L.pHvaluesinarangeof2-10.5havelittleeffectonthecaptureefficiencyoforthophosphatesandtotalphosphorus.

简介：Hierarchicalsea-urchin-shapedmanganeseoxidemicrospheresweresynthesizedviaatacilemetnoabasedonthereactionbetweenKMnO4andMnSO4inHNO3solutionat50C.Theaveragediameterofthemicrospheresis850nm.Themicrospheresconsistofacoreofdiameterof800nmandnanorodsofwidth50nm.Thenanorodsexistattheedgeofthecore.TheBrunauer-Emmett-Tellersurfaceareaofthesea-urchin-shapedmicrospheresis259.4m2/g.Apossibleformationmechanismofthehierarchicalsea-urchin-shapedmicrospheresisproposed.Thetemperaturefor90%conversionofbenzene(T90%)onthehierarchicalurchin-shapedMnO2microspheresisabout218℃.

简介：Nano-sizedhexagonalmagnesiumhydroxide（Mg（OH）2）withgooddispersibilitywassynthesizedbyadoubleinjection-hydrothermalmethod,utilizingpolyvinylpyrrolidone（PVP）asanadditiveandwithoptimizedprocessingparameters.SEMandBETanalysisshowedthatthemeanparticlesizeandspecificsurfaceareaoftheMg（OH）2particleswere174nmand50.77m2/g,respectively.TheFT-IRspectraandtheXRDpatternsshowedthatPVPwasadsorbedonthesurfaceoftheMg（OH）2crystal,thuseffectivelylimitingparticleagglomerationandhinderingcrystalgrowthalongthe（101）plane.TGAshowedadecreaseinthedecompositiontemperatureandanincreaseintheweightlossoftheMg（OH）2particlesduetoadditionofPVP.

简介：TiO2-loadedactivatedcarbonfibers（ACF）werepreparedbyahydrothermalmethod.Thesampleswerecharacterizedbyscanningelectronmicroscopy（SEM）,X-raydiffraction（XRD）,Fouriertransforminfrared（FT1R）spectrometryandUV-visdiffusereflectancespectra（DRS）.SEMimagesshowedthattheTiO2nanoparticlesweredepositedonthesurfaceofACF,andtheparticlesizeandloadingamountofTiO2werevariedbychangingtheinitialconcentrationoftetrabutyltitanate（TBOT）.TheresultsofanashexperimentshowedthattheloadingamountsofTiO2were18.4%,43.3%,52.5%,75.1%,and91.1%forinitialconcentrationsofTBOTof0.07,014,0.21,0.28,and0.35mol/L,respectively.PhysicalinteractionsplayedanimportantroleintheformationofTiO2/ACFcompositefibersthatabsorbUVandvisiblelight.ComparedwiththoseofACF,improvedadsorptionandphotocatalyticactivitytowardRhodamineB（RhB）wereobservedforTiO2/ACFcompositefiber.TheRhodamineBcouldberemovedefficientlybyTiO2/ACFcompositefibers,andtheTiO2loadingamounthadasignificanteffectonthephotocatalyticactivityofTiO2/ACFcompositefibers.

简介：Carbonnanotube（CNTs）/Fe-Ni/TiO2nanocompositephotocatalystshavebeensynthesizedbyaninsitufluidizedbedchemicalvapordeposition（FBCVD）method.ThecompositephotocatalystswerecharacterizedbyXRD,Ramanspectroscopy,BET,FESEM,TEM,UV-visspectroscopy,andXPS.TheresultsshowedthattheCNTsweregrowninsituonthesurfaceofTiO2.Fe（lll）inTiO2showednochemicalchangesinthegrowthofCNTs.Ni（Ⅱ）waspartlyreducedtometalNiintheFBCVDprocess,andthemetalNiactedasacatalystforthegrowthofCNTs.ThephotocatalyticactivitiesofCNTs/Fe-Ni/TiO2decreasedwiththeriseoftheFBCVDreactiontemperature.ForthesamplesynthesizedatlowFBCVDtemperature（500℃）,morethan90%andnearly50%ofmethylenebluewereremovedunderUVirradiationin180minandundervisiblelightirradiationin300min,respectively.TheprobablemechanismofsynergisticenhancementofphotocatalysisontheCNTs/Fe-Ni/TiO2nanocompositeisproposed.

简介：加速度计实现数字化有利于系统集成，但随之引入的延时和量化噪声会影响系统的控制稳定性及测量分辨率。为保证闭环系统数字化后仍具有足够稳定裕度，分析出了延时的主要来源为离散化引入的等效时延和检测与控制的不同步，并得出其对系统稳定性的定量化影响。研究了采样频率及量化噪声对输出的影响，提出利用过采样的方法可以有效减小量化噪声对闭环系统输出的影响，从而可提高系统的检测分辨率。最终，建立了进行数字化控制器采样频率的定量化选择依据。用Matlab/Simulink进行了仿真并进行了实验研究，仿真结果及实验结果与理论分析能较好吻合。

简介：针对舰机惯导传递对准过程中舰船机动受限、系统可观测性差等特点,提出了基于状态参数可观测度分析的自适应滤波方法.通过系统状态参数可观测性分析,量化各状态分量可观测程度,进而根据可观测度大小分组构造自适应调节因子,并采用滤波增益衰减法对观测度低的分量通道进行有效处理,以此来提高传递对准滤波算法的适应性和滤波估计精度.舰船模拟轨迹下仿真结果表明,基于状态参数可观测度分析的自适应滤波方法和常规方法相比,具有较高的精度和较快的收敛速度,对准精度由3′提高到2′,滤波估计收敛时间由15min缩短至8min.

简介：温度是IMU及其他导航器件等精密仪器中需要监测的重要参数,传统的温度监测一般使用热电偶或者数字温度传感器（如DS18B20）等,监测程序复杂,功耗高,因此使用精密仪器中广泛采用的FPGA芯片独立完成高集成度、低功耗温度监测具有重要意义.在FPGA中通过搭建环形振荡器产生了自激振荡信号,该信号周期与FPGA芯片温度具有正相关性,通过对振荡信号周期的检测完成了对温度的监测,设计了一种以FPGA芯片同时作为敏感头和处理模块的温度传感器.通过对XilinxVirtex-2系列FPGA芯片进行实验,得到该传感器在-40℃～＋60℃的范围内具有优于0.1℃的分辨率,优于0.5℃的检测精度,满足一般温度监测需要.实验表明该传感器具有功耗低、集成度高、可靠性好等优点.