简介:剑萍的听感在之前领略过300ASE搭配X125郁音色之后,我想换上声音更饱满厚实、来自英国的RUARK“军刀”,出来的声音会不会是“浓得化不开”?但出来的效果却表明我的担心是多余的,也许这应该得益于“军刀”本身音染低、失真小的好处吧,说明它的声音虽然厚实、丰满,但一切都是在控制范围之内,而且这种美态是来自单元本身的天然特性,而非来自箱体的谐振。感觉虽然浓郁的程度有所增加,但增加的幅度并不大,让人完全不用担心声音会太甜腻。
简介:Atheoreticalmodelinthe1900nmwavebandforamplifiedspontaneousemission(ASE)ofthulium-dopedsilicafiberispresented.TheASEspectralpowerasfunctionsofthefiberlengthandthepumppowerisinvestigatedbysolvingtherateandpropagationequations.Bycalculation,whentheconcentrationofthuliuminfiberis2.25×1025m-3,thefibercorediameteris2.6μm,andthepumppoweris200mWat808nm,theoptimalfiberlengthis8.1m,andtheoutputpowerofASEcanreach60mWintherangeof1800-1950nmwiththisfiberlength.Theoptical-to-opticalconversionis30.3%.Theoptimalpumppoweralsocanbeobtainedbythismodel.
简介:All-opticalregeneratorscanbeusedtosuppressamplifiedspontaneousemission(ASE)noiseintroducedbycascadederbiumdopedfiberamplifiers(EDFAs)inopticalfibercommunicationsystemsandleadtotheimprovementofopticalreceiversensitivity.ByintroducingtheQ-factortransferfunction(QTF),weevaluatetheQ-factorperformanceofdegeneratefour-wavemixing(DFWM)regeneratorswithclockpumpandrevealthedifferencesbetweentheoptimalinputpowersdeterminedfromthestaticanddynamicpowertranferfunction(PTF)andtheQTFcurves.Oursimulationshowsthattheclock-pumpregneratoriscapableofimprovingtheQ-facorandreceiversensitivityfor40Gbit/sASE-degradedreturn-to-zeroon-offkeying(RZ-OOK)signalby2.58dBand4.2dB,respectively.
简介:Theanalyticalexpressionofbiterrorprobabilityinabalanceddifferentialphase-shiftkeying(DPSK)opticalreceiverconsideringnonlinearphasenoiseandEDFAASEnoiseisgiven,whichisveryusefultoestimatetheperformanceofDPSKbalancedandunbalancedreceiverinopticalcommunicationsystem.Throughanalysis,ifonlynonlinearphasenoiseisconsidered,boththebalanceandunbalancedreceivershavethesameperformances.ButifaddingtheASEnoiseofEDFA,thebalancedreceiverisbetter.
简介:TheeffectsofethanolsolutionsonlowerpowerArICPdischargewerestudiedbymeasuringplasmatemperatures(gastemperature,excitationtemperature,ionizationtemperatureandelectrontemperature)andelectronnumberdensities.Thetemperaturesandelectronnumberdensitieswerereducedwiththeincreasingofethanolconcentration.TheICPsystemismuchapartfromLTEconditions.Thus,ethanolsolutionswillplaceareducingeffectonspectrallineintensity.
简介:摘要ICP的早期诊断多依赖孕期检查,瘙痒多是首发、常见症状,可伴黄疸症状,肝功能异常和血清胆汁酸升高等。肝内胆汁淤积症一旦明确诊断,宜积极治疗,加强孕期监护、减少或避免并发症、适时终止妊娠;治疗上宜包括加强胆汁酸排泄、改善微循环、补充维生素K、促胎肺成熟等。所以ICP对胎儿危害性较大,宜尽早诊断,加强监护,积极治疗,适时终止妊娠,提高围生儿生存率和健康率。
简介:摘要:测试电感耦合等离子体原子发射光谱法测定矿石中铟的分析方法。选择铟的分析谱线为230.650nm。方法使用王水分解试样,以10%的王水为测定介质,对工作仪器参数、测定元素分析线、干扰元素、精密度进行了实验。实验结果快速准确,能够满足化验分析实际应用要求。铟在地壳中的分布量比较小,又很分散。至今未发现其富矿,只是在锌和其他一些金属矿中作为杂质存在,因此它被列入稀有金属。由于其在实际应用中的特殊用途,以至铟具有相当高的实用价值以及经济价值,因此如何对矿物中铟含量的进行有效准确的测定,对于实际生产有很重要的意义。使用电感耦合等离子体原子发射光谱法,不仅因为其能快速准确测定出试样中铟的含量,还因为其能同时测定试样中多个元素,能大大提高工作效率。因此我们在此分析电感耦合等离子体原子发射光谱法测定锌铜矿石中铟的方法。