简介：

简介：AbstractThe pathophysiology of twin-to-twin transfusion syndrome (TTTS) is complex, and its understanding has evolved along with the evolution and revolution of fetal diagnostic and therapeutic techniques. Over the last few decades, several therapeutic interventions have been researched for improving the outcomes in TTTS. We present a summary of the current protocols for surveillance, diagnosis, and staging of TTTS in monochorionic pregnancies. We also describe in detail the technique for treatment of TTTS by endoscopic laser photocoagulation.

简介：MPower显然是疯了,虽然是第一次将触角伸向SUV领域,却制造了两个在W高达动画片里才会出现的怪物,身躯庞大的X5M和X6M。

简介：AbstractThe rate of twin pregnancies has increased over the last decades, largely because of the ongoing development of assisted reproductive technology and increased maternal age at childbearing. Twins have a higher risk of adverse outcomes during pregnancy and the perinatal period. The prevalence of umbilical cord abnormalities is higher for twin pregnancies compared with singleton pregnancies. Some of these abnormalities are nonspecific to twinning and can also be found in singleton gestations (such as velamentous cord insertion, vasa previa, and single umbilical artery). Other abnormalities are associated with monochorionic twins, such as umbilical cord entanglement, and umbilical proximate cord insertion. Most of these abnormalities can be detected by ultrasound evaluation. The early and accurate ultrasound diagnosis of chorionicity, amnionicity, and placental and umbilical cord characteristics is crucial if we are to predict the risk of complications and to determine the best management for twin pregnancies. Histopathological examination of the placenta and umbilical cord after delivery can help to confirm prenatal diagnosis and to provide a better understanding of the physiopathology of their abnormalities. The aim of this review was to emphasize the role that the umbilical cord plays in twin complications and to describe the management of these high-risk pregnancies.

简介：AbstractMode of delivery in twin gestation has been a matter of debate for decades. In 2013, the only randomized controlled trial concerning mode of delivery in twin gestations was published, answering some of the most pressing questions in this matter. The Twin Birth Study randomized patients carrying dichorionic-diamniotic or monochorionic-diamniotic twins, with the first twin in cephalic presentation, between 32 and 39 weeks of gestation, to planned vaginal vs. planned cesarean delivery, and found no significant differences in perinatal or maternal outcomes. These clinical findings greatly benefit our clinical practice, but there lacks related study investigating how the practices have changed. In this review, we searched PubMed from 1980 through January 2021 using combinations of the following terms: twin, delivery, vaginal delivery, and cesarean section. We will try to address the known literature before and after the publication of the Twin Birth Study in western countries and compare that to what has been practiced in China.

简介：

简介：Thoughterroriststriggered(触发)thecollapse(倒塌)oftheWorldTradeCenter'sTwinTowers,muchoftheenergy--calculatedbyaphysicisttohavebeenatleast2percentthatoftheatomicbombdroppedonHiroshima(广岛)--wassuppliedbynature'smostubiquitous(普通存在的)force:gravity.

简介：

简介：Thewavetransmissioncharacteristicsandwaveinducedpressuresontwinplatebreakwaterareinvestigatedexperimentallyinregularandrandomwaves.Atotaloftwentypressuretransducersarefixedonfoursurfacesoftwinplatetomeasurethewaveinduceddynamicpressures.Thespatialdistributionofdynamicwavepressureisgivenalongthesurfaceofthetwinplate.Theupliftwaveforceobtainedbyintegratingthehydrodynamicpressurealongthestructureispresented.DiscussedaretheinfluenceofdifferentincidentwaveparametersincludingtherelativeplatewidthB/L,relativewaveheight/iHaandrelativesubmergencedepths/aonthenon-dimensionaldynamicwavepressuresandtotalwaveforces.Fromtheinvestigation,itisfoundthattheoptimumtransmissioncoefficient,tKoccursaroundB/L0.41~0.43,andthetwinplatebreakwaterismoreeffectiveindifferentwaterdepths.Themaximumofpressureratiodecreasesfrom1.8to1.1whentherelativesubmergencedepthoftopplateisincreasedfrom0.8to+0.8.

简介：Withthickplatesof2219high-strengthalloy,themicrostructuresofweldedjointswithtwinwireMIGweldingwereanalyzed.Experimentalresultsshowthatnohotcrackwasfoundintheweldduetodiscontinuousdistributionofcocrystallizationwithlowmeltingtemperature,butporosityisseriousinthefirstweldseamthatismainlycomposedofequiaxialgrainswithunevensizes.Asthepoorpositionofthewholeweldedjoint,fusionzonehasbigandcoarsegrains,unevenmicrostructures;Inquenchingzone,thereexistalotofsoakedmicrostructuresthatcocrystallizationwithlowmeltingtemperaturesoluteintomatrix,thusstrengtheningthemetalinthiszone;Inexcessiveagingzone,muchmorephasesthatdistributeevenlywillbeseparatedfromthematrix;Outsidethiszone,propertiesandmicrostructuresofthemetalarebasicallysimilartomatrixduetotherelativelylowtemperatureorunaffectedheatinthezoneduringwelding.

简介：当形成飞时，太空船被用作站台获得土面向的观察，在这些太空船之间的精确基线总是是必要的。严肃恢复和气候实验(优雅)使命针对印射全球严肃地和它的变化。优雅卫星的精确基线为当模特儿的严肃地是必要的。成双的卫星的运动学、减少的动态相对轨道的决心为动态相对轨道在2公里的这份报纸，和精确性被学习了，为运动学的5公里能被获得，大多数在GPS歧义上的双差别由此被解决。

简介：无

简介：这份报纸的主要目的是学习使变形的Riemannian延期g+VG在余切捆的，在G是底上的一个成双的Norden度量标准的地方歧管。

简介：无

简介：一台成双的单向性的推动汽轮机被建议了以便提高波浪精力植物的表演。这个汽轮机系统使用二台单向性的推动汽轮机，他们的流动方向与对方不同。然而，汽轮机特征没迄今为止被澄清。在稳定的流动条件下面的一台单向性的推动汽轮机的表演被在这研究与大活塞/柱体使用一条风隧道试验性地调查。然后，成双的推动汽轮机的效率被伪稳定的分析用试验性的结果估计了。

简介：AbstractTwin reversed arterial perfusion sequence, a severe and unique complication of monochorionic multiple pregnancy, is characterized by vascular anastomosis and abnormal or absent cardiac development in the twins. This article reviewed its pathogenesis, prenatal ultrasound diagnosis, and management. The pump twin’s chances for survival can be maximized by proper management. The optimal timing of the interventions remains a debate, although the latest studies encourage early intervention, i.e., in the first trimester. The most preferred approach is to interrupt the vascular supply to the acardius, such as through ultrasound-guided laser coagulation and radiofrequency ablation of the intrafetal vessels.

简介：<正>欧宝在2004年3月的日内瓦车展上,首展其最新的TigraTwinTop小车,这将使欧宝成为第一个大批量生产可收合硬顶2座小车的德国生产商。动感的线条以及给人印象深刻的实用性,新的Tigra提供开篷享受新鲜空气以及coupe享受兜风乐趣的双重体验。最值得称道的是它的电子液压可折叠式车顶篷,只要轻轻按一下按钮就可以在18秒之内开合,这是欧宝生产的第一款双座敞篷运动轿车。它可以根据天气状况或驾驶者的意愿,既可以打开顶篷呼吸到新鲜空气又可以关

简介：

简介：

简介：HonestusofCorinthwasapoetfromtheJulio-Claudianera.HisbestknownepigramisdedicatedtoanunnamedAugustaandtwoCaesarsandpreservedonastoneinThespiae(Atthesameplace,furtherpoemsbyhimwerefoundinanexedrabearingtheinscription'theThespiansfortheHeliconianMuses').