简介：Inthispaper,awavelengthdivisionmultiplexing(WDM)transmissionsystemderivedfromthecoherentopticalorthogonalfrequencydivisionmultiplexing(CO-OFDM)withpolarizationdivisionmultiplexing(PDM)and16-orderquadratureamplitudemodulation(QAM)isstudied.Asimulationof80-channelWDMtransmissionsystemwithdatarateof200Gbit/sisbuilt,andthetransmissionperformanceofthesystemisanalyzed.ThesimulationresultsshowthatthesystemQvalueoftheWDMchannelsat16Tbit/swithaspectralefficiencyof7.14bit/s/Hzispotentiallyover10.0dBforalonghaultransmissionupto1800kminastandardsingle-modefiber.

简介：Anovelmethodfordistortion-freeopticalpulsetransmissionistheoreticallyproposedandsimulated,inwhichtwotimelensesformedbydispersionfibersandquadraticphasemodulationsareutilized.OneisusedasanopticalinverseFouriertransformation(OIFT)devicetotransformtheinitialtime-domaindatatofrequency-domainoneatthetransmitterandtheotherasanopticalFouriertransformation(OFT)devicetorecoverthedataatthereceiver.Byusingtheunchangedspectralenvelopeinlinearopticalfibercommunication,theinitialdatacanberecovered.Throughsimulations,a10×100Gb/sintensitymodulateddirect-detection(IM-DD)densewavelengthdivisionmultiplexing(DWDM)systemover2000kmtransmissionwithoutthecompensationforpolarizationmodedispersion(PMD)anddispersionslopeisachieved,whichcanbeusedtoupgradethecurrent10-Gb/sIM-DDsystemtoa100-Gb/sonedirectly.

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简介：这研究被执行在不肥沃的汉中国家庭从父亲分析YqAZFcmicrodeletions的垂直传播到儿子调查基因因素和家庭背景影响富饶地位。在19个汉家庭的不肥沃的男性的外部血与修改复合聚合酶链反应(PCR)被提取并且屏蔽。家谱根据富饶地位和这些题目的临床的特征被拉。YqAZFcmicrodeletions的垂直传播在19个调查家庭的六种情况中被检测(31.6%，6/19)。尽管父亲和儿子显示出YqAZFc删除的一种类似的类型，父亲是肥沃的，而儿子是不肥沃、显示出的严重oligozoospermia。到在代上的不肥沃的儿子的从肥沃的父亲的YqAZFcmicrodeletion的垂直传播不是稀罕的。这在汉中国家庭在父亲和儿子在富饶地位上有不同效果。基因因素和家庭背景影响spermatogenetic显型。

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简介：瞄准：为了在煽动性的肠疾病(IBD)评估肝炎B(HBV)感染的流行，在我们的医院和尝试里列在后面在上面到的病人识别涉及这感染传播的可能的风险因素。方法：这是176个病人为医药会见根据他们的到达为被选择的代表性的研究。所有这些病人已经有IBD诊断。病人被会见，一张问询表被填写。结果：在我们检查了的176个病人的组，我们发现(30)17%是anti-HBc积极。从有积极anti-HBc的30个病人，(4)2.3%有积极HBsAg和否定HBV-DNA。在里面识别可能的HBV感染传播的一次尝试在IBD病人冒因素的风险，117个病人被提交了到某种外科的过程，而是仅仅24个病人，这被观察有的积极anti-HBc(P=0.085)。对待IBD复杂并发症的外科不是为HBV感染传播的一个风险因素，这也被观察，自从我们没得到静态地重要的P价值。然而，被提交了到外科对待IBD复杂并发症的IBD病人然后收到了更多的输血提交到另外的外科的干预的病人(P=0.015)。结论：在IBD病人有积极anti-HBc(17%)和积极HBsAg(2.3%)的高发生什么时候与全面人口(7.9%)相比。

简介：ThegrowthdetectsinNd:YCa4O(BO3)3(Nd:YCOB)crystalswereinvestigatedbytransmissionsynchrotrontopography.ItwasfoundthatgrowthstriationsweretheprimarydefectsinNd:YCOBcrystals.Grown-indislocations.mosaicblocksandinclusionswerealsoobseredinthecrystals.Theeffectoftemperaturefieldontheformationofgrowthdefectsinthecrystalswasdiscussed.

简介：摘要：文章针对输电线路与变电专业交界部分进行分析，总结关键节点、顺序，为今后同类作业提供参考。

简介：第一次，周期的装载电极和蘑菇类型波导被联合基于联合的不对称的intra-step-barrier改进旅行波浪electroabsorption调节的人(TWEAM)的表演两倍拉紧的量井(AICD-SQW)。周期的蘑菇类型TWEAM的电的调整反应被使用相等的电路模型获得，并且与常规蘑菇类型TWEAM对应物的模拟结果相比。相等的电路模型模拟结果显示为300m的作为模范的调整长度，有周期的传播线装载的蘑菇类型TWEAM能完成宽得多的带宽大约99.7GHz和43.1GHz比有为35和45结束的大约43GHz和33GHz的常规对应物分别地。

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简介：Twotransmissioncurvedcrystalspectrometersaredesignedtomeasurethehardx-rayemissioninthelaserfusionexperimentofComptonradiographyofimplosiontargetonShenGuang-IIIlaserfacilityinChina.Cylindricallycurvedα-quartz(10–11)crystalswithcurvatureradiiof150and300mmareusedtocoverspectralrangesof10–56and17–100keV,respectively.Thedistancebetweenthecrystalandthex-raysourcecanbechangedoverabroaddistancefrom200to1500mm.Theopticaldesign,includingtheintegralreflectivityofthecurvedcrystal,thesensitivity,andthespectralresolutionofthespectrometers,isdiscussed.WealsoprovidemechanicdesigndetailsandexperimentalresultsusingaMoanodex-raysource.High-qualityspectrawereobtained.Weconfirmedthatthespectralresolutioncanbeimprovedbyincreasingtheworkingdistance,whichisthedistancebetweentherecordingmediumandtheRowlandcircle.

简介：AbstractMother-to-child transmission (MTCT) of hepatitis B virus (HBV) is the main cause of chronic hepatitis B. The prevention of MTCT plays a critical role in control chronic hepatitis B. The main purpose of the present clinical guidelines is to aid healthcare providers in managing pregnant women with positive HBsAg and in preventing MTCT of HBV. We recommend: (1) all pregnant women require prenatal screen for hepatitis B serological markers; (2) newborn infants of mothers with negative hepatitis B surface (HBsAg) require administration of hepatitis B vaccine on a 0, 1, and 6 month-schedule; (3) newborn infants of mothers with positive HBsAg need hepatitis B immunoglobulin (HBIG) and birth dose vaccine within 12 hours (the sooner the better) after birth, followed by injection of the second and third dose of hepatitis B vaccine at the age of one and six months respectively; (4) in preterm neonates or neonates with poor health conditions born to HBsAg-positive mothers, the immunoprophylaxis measures should be appropriately taken; (5) to further reduce MTCT of HBV, pregnant women with HBV DNA levels >2×105 IU/mL or positive hepatitis B e antigen may receive oral antivirals, starting from 28 to 32 weeks of gestation and discontinuing the drug on the delivery day; (6) cesarean section is not recommended to reduce MTCT of HBV; (7) breastfeeding is recommended in infants of HBsAg-positive mothers, regardless of maternally positive hepatitis B e antigen, maternal nipple injury or bleeding, oral mucosal injury in neonates or infants; (8) breastfeeding is recommended in infants born to HBsAg-positive mothers who require continuation of antiviral therapy after delivery, and the infants should be followed up to observe whether adverse effects develop; and (9) the infants born to HBsAg-positive mothers should be tested for hepatitis B serological markers at the age of 7-12 months, and those who are negative for HBsAg and anti-HBs should receive three doses of hepatitis B vaccine on the 0, 1, and 6 month-schedule as soon as possible.

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简介：OnOctober12thisyear,thecontractsoftheprocurementontheconverterstationequipmentforThreeGorges-GuangdongandGuizhou-Guangdong±500kVDCtransmissionprojects,know-howtransferandthesubcontractsonequipmentmanufacturinghasbeensigned.Theconstructionscaleofthetwoprojectsis

简介：Wereportacompletegenomicsequenceofrareisolates(minorgenotype)oftheSARS-CoVfromSARSpatientsinGuangdong,China,wherethefirstfewcasesemerged.Themoststrikingdiscoveryfromtheisolateisanextra29-nucleotidesequencelocatedatthenucleotidepositionsbetween27,863and27,864(referredtothecompletesequenceofBJ01)withinanoverlappedregioncomposedofBGI-PUP5(BGI-postulateduncharacterizedprotein5)andBGI-PUP6upstreamoftheN(nucleocapsid)protein.Thediscoveryofthisminorgenotype,GD-Ins29,suggestsasignificantgeneticeventanddifferentiatesitfromthepreviouslyre-portedgenotype,thedominantformamongallsequencedSARS-CoVisolates.A17-ntsegmentofthisextrasequenceisidenticaltoasegmentofthesamesizeintwohumanmRNAsequencesthatmayinterferewithviralgenomereplicationandtranscriptioninthecytosoloftheinfectedcells.Itprovidesanewavenuefortheexplorationofthevirus-hostinteractioninviralevolution,hostpathogenesis,andvaccinedevelopment.

简介：ThedetailedmicrostructuresofNi80Fe20/Fe50Mn50superlatticeshavebeencharacterizedusingbothx-raydiffractiontechniquesandtransmissionelectronmicroscopy.Theobrivouslayeredstructure,typicalcolumnstructureandtwinswhichexistinNi80Fe20/Fe50Mn50superlatticeswereobservedthroughperformingtransmissionmicroscopy.Bycombiningthetechniqueoflowanglex-rayreflectivity(specularandoff-specularscans)withtheanomalousscatteringeffectandhigh-anglex-raydiffraction(usingconventionalx-ray),wequantitativelyanalysedthemicrostructuralvariationasafunctionofannealingtemperature.Itisfoundthatthelateralcorrelationlength,the(111)peakintensityofthesuperlatticesandtheaveragemultilayercoherencelengthallincreasewithariseinannealingtemperatureannealingcandecreasetherootmean-squareroughnessattheinterfacesofNi80Fe20/Fe50Mn50superlattices.theobtainedmicrostructuralknowledgewillbehelpfulinunderstandingthemagneticpropertiesoftheni80Fe20/Fe50Mn50exchangebiassystem.

简介：Alowcost8×10-Gb/stransmissionsystemover1500kmonconventionalfiberusingchirpedfiberBragggrating(CFBG)asdispersioncompensatorisdemonstrated.Thebiterrorrate(BER)below10-10at1500kmisobtained.Thechannelspacingis0.8nmandtheopticalamplifierspacingis100km.Only16erbium-dopedfiberamplifiers(EDFAs)areused.

简介：以便为对米饭识别米饭变化的抵抗保存病毒黑条纹的矮子疾病，一个简单、可靠的方法被开发，通过哪个没有病毒的小棕色的planthopper(SBPH)获得了米饭从冻结的感染的叶子的黑条纹的矮子病毒(RBSDV)和病毒被传给健康米饭植物。试验性的结果证明SBPH能从冻结的感染的米饭叶子获得RBSDV，病毒能被传给一个易受影响的米饭变化。能力获得RBSDV并且由SBPH把病毒传给健康植物，冻结的感染的叶子之间并且在vitro没有重要差别感染的叶子。新奇方法能被用于米饭变化抵抗的鉴定到米饭黑条纹的矮子疾病，为米饭便于繁殖过程黑条纹的矮子疾病抵抗。

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简介：AbstractObjective:The coronavirus disease 2019 (COVID-19) epidemic resulting from severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has still spread globally. The occurrence of the Delta variant, which is more infectious and spreads faster than earlier forms of the virus that causes COVID-19, makes infection prevention more challenging. Therefore, this study aimed to gain a comprehensive insight into the transmission routes of SARS-CoV-2 for curbing the propagation of SARS-CoV-2 in human populations.Methods:We studied a prospective cohort of 576 patients admitted consecutively to the First Affiliated Hospital of Guangzhou Medical University from January 21 to June 8, 2020. These patients were chosen based on their similar clinical phenotypes or imaging findings. There were 21 (3.6%) laboratory-confirmed COVID-19 patients (16 severe and 5 mild cases) and 555 non-COVID-19 patients. The antibody response and routes and duration of viral shedding were systematically evaluated in serial clinical specimens. Moreover, SARS-CoV-2 RNA was also detected in a mouth rinse, urine, and tear samples. This study was approved by the Medical Ethical Committee of The First Affiliated Hospital of Guangzhou Medical University (approval No. 2020-77).Results:SARS-CoV-2 mainly existed in sputum, nasal and throat swabs, and feces samples. Virus latency was longer in sputum and feces samples than in nasopharyngeal samples. IgG antibody response in respiratory samples was related to disease severity. Although droplets and aerosols are the major transmission routes for COVID-19, covert routes of transmission from asymptomatic patients, contaminated surfaces, and wastewater are also of interest.Conclusion:Our findings provide a solid foundation for developing prophylactic measures against SARS-CoV-2.