简介:Basedontheconceptofthermo-radiationtheory,theprincipleofnon-contacttemperaturemeasurementwithopticalfiberisintroduced.Thenewpyrometeroperatesonthebasisoftwo-waytemperaturesignaldivisioncalculationviamrcrocom-putersignalprocessingsystem.Itsdesignmethodandsmartconstructionoftheelectro-opticalsystempossesssuchadvantagesashighmeasurementaccuracy,freedomfromelectricinterferenceandotherperturbationsaswellasflexibleapplications.Theindica-tionscaleofthemeasuredtemperatureandexperimentresultsaregiveninthispaper.
简介:Theprincipleofnewopticalfibrepressuretransducerisanalysed,andinge-niousdesignschemeofthistransducerisvigen.Thisnewtransducerspecimenisprovidedwithfollowingcharacteristics;experimentaltransmittingdistanceis20m(actuallyupto1000m);systemsensitivityis0.1mV/Pa;powerconsumptionoftheprobeislessthan125μW.Finally,somepointsoftheappraisementaregiveninthispaper.
简介:Anopticalfibertransmittingphotoelectriccouplingcurrenttransformerhasbeendeveloped.Intheenvironmentofhighvoltageandelectromagneticfields,thisdeviceischaracterizedbyhighinsulation,highreliability,smallmassandhighanti-interference.Thestructuredesignandopertingprincipleofthesystemareintroduced,measurementerrorsareanalyzedandexperimentalresultsaregiven.
简介:Theoperationprincipleofanovelportableoilingredientinstrumentisintroduced.Usingthetheoryoffluorescencemeasurement,thisinstrumentcancarryoutfastandconsecutivein-situdetectionofoilingredientinseawater,confirmingfastandcorrectlythesituationofoilcontaminationsuchastheconcentrationandthearea,etc.Thelowestdetectableconcentrationfortheinstrumentis1×10-8g/mlwiththeprecisionoflessthan3%.Theresultsofexperimentandpracticeshowthatthissystemhaswellwater-sealedcharacteristicandrepeatability.
简介:摘要目的本研究探讨急性脑外伤患者心电图相关指标的变化及其与预后的关系。方法前瞻性收集2014年1月至2018年1月就诊的急诊脑外伤患者289例,最终入选219例及与相匹配的对照组220例,入院1 h及住院72 h行心电图,测算P波离散度(Pd)、校正后QT (QTc)、校正后QT离散度(QTcd )、校正后Tp-e间期(Tp-ec )、校正后Tp-e间期离散度(Tp-ecd )及Tp-e/QT比值,分别应用独立样本t检验和配对样本t检验比较脑外伤组第1天和对照组、第1天和第3天上述指标的变化,分析外伤组心电图指标与病情轻重及住院期间不良事件(MACE)的关系。结果脑外伤组患者第3天QTc、Tp-ec和Tp-e/QT较对照组及第1天均增加,差异有统计学意义(P均<0.05);格拉斯哥(GCS)评分中重度脑损伤患者Tp-ec、Tp-e/QT较评分为轻度者增大,差异有统计学意义[(150.48±16.58 )vs(130.14±11.86 ),P=0.006 ;(0.29±0.04)vs (0.23±0.03 ),P=0.030]。住院期间出现MACE组患者Tp-ec、Tp-e/QT较无MACE组增大[(149.76±12.52 )vs(128.84±12.47 ),P <0.001 ;(0.30±0.04 )vs (0.21±0.03),P <0.001]。结论急性脑外伤患者Tp-e和Tp-e/QT与病情严重程度相关,一定条件下可作为短期预后的评价和预测指标。
简介:目的探讨应用血栓抽吸对行直接经皮冠状动脉介入治疗(PCI)的急性ST段抬高型心肌梗死(STEMI)患者Tp-e及Tp-e/QT的影响.方法选取同期发病12h内行直接PCI罪犯血管(IRA)内存在血栓负荷重的STMEI患者110例,随机分成血栓抽吸组(血栓抽吸+PCI)及对照组(单纯PCI).测量两组PCI术前及术后2h心电图中Tp-e及Tp-e/QT,并观察两组在住院期间发生恶性心律失常的情况.结果两组在性别、年龄、心血管风险因子、症状发作至球囊扩张时间、PCI术前Tp-e及Tp-e/QT等方面比较未见统计学差异(P>0.05).血栓抽吸组PCI术后ST段回落>70%的比率、Tp-e及Tp-e/QT减少的幅度均高于对照组[60.00%比40.00%,(22.66±9.91)ms比(15.89±8.24)ms,0.04±0.03比0.03±0.02,P均<0.05];血栓抽吸组PCI术后Tp-e、Tp-e/QT及术后至出院前发生恶性心律失常的比率均低于对照组[(88.54±13.13)ms比(93.7l±11.00)ms,0.25±0.03比0.26±0.03,16.00%比33.33%,P均<0.05].结论对于冠状动脉内血栓负荷重的急性STEMI患者,直接PCI术时应用血栓抽吸可以更多地减少心室复极离散度指标Tp-e及Tp-e/QT,降低心肌梗死后恶性室性心律失常发生的风险.其原因可能与血栓抽吸有助于更好地恢复微循环再灌注水平有关.
简介:AbstractVaccines are one of the biggest successes in modern history and are particularly important in light of the multiple ongoing epidemics. Recently, vaccines have protected peoples’ health and lives around the world during the coronavirus disease 2019 pandemic. Different types of vaccines have their own characteristics and advantages and are used in the context of different epidemics. Responses to vaccination are also different, and can include adverse reactions and absent responses. These individual differences are thought to be influenced by host genes. In this review, we first discuss vaccine types and characteristics. Second, we discuss different responses to vaccination, primarily focusing on the association between genetic variation and inter-individual differences.