简介：

简介：

简介：

简介：尼康公司在PMA展会上发布了新款单反数字相机D2Hs．这款相机是2003年发布的D2H的升级版本．在D2H的基础上进行了多项改进。D2Hs采用了第二代3D矩阵测光系统．并强化了对高速运动物体的对焦能力．连续拍摄能力也有显著，可以连续拍摄50张。JPEG或者40张RAW格式的照片，最高拍摄速度为8张／秒．这款相机还支持最新的sYCC色彩模式。D2Hs的主要弱点在于仍然采用了与D2H相同的LBCAST图像传感器，有效像素仅为410万。

简介：3D影片精彩,奈何一片难求。眼睁睁看着被《阿凡达》勾起的3D馋虫。又被时间一点点消磨掉，那种感觉，怎一个“郁闷”了得。既然此路不通，何必一味消沉，这次跟我一道，利用MakeMe3D这款工具，把电脑中保存的那些2D视频，转换成具有3D效果的电影，如此一来，我们3D片源岂不就如黄河之水，滔滔不绝了吗？

简介：摘要近年来，国际电信联盟明确了5G移动通信的主要应用场景，包括增强型移动宽带、大规模机器类型通信、超可靠和低延迟通信。5G移动通信将在用户体验速率、频谱效率、移动性、时延、网络能效等八个方面的技术指标较4G系统提升一个或多个数量级。以峰值传输速率和系统能量效率为例，5G移动通信的峰值传输速率预期将达到10Gb/s，较4G移动通信的100Mb/s提高100倍，系统能量效率相比于4G移动通信需提升10倍。现有支持4G移动通信的无线传输关键技术将无法满足5G移动通信的需求因此发展新型无线传输关键技术迫在眉睫。

简介：AbstractBackground:The complete mesogastrium excision (CME) based on D2 radical gastrectomy is believed to significantly reduce the local-regional recurrence compared with D2 radical gastrectomy in advanced gastric cancer, and it is widely used in China. This study aimed to explore whether D2 + CME is superior to D2 on surgical outcomes during gastrectomy from Chinese data.Methods:Feasible studies comparing the D2 + CME (D2 + CME group) and D2 (D2 group) published up to March 2020 are searched from electronic databases. The data showing surgical and complication outcomes are extracted to be pooled and analyzed.Results:Fourteen records including 1352 patients were included. The D2 + CME group had a shorter mean operative time (weighted mean difference [WMD] = -16.72 min, 95% confidence interval [CI]: -26.56 to - 6.87 min, P < 0.001), lower mean blood loss (WMD = -39.08 mL, 95% CI: -49.94 to -28.21 mL, P < 0.001), higher mean number of retrieved lymph nodes (WMD = 2.13, 95% CI: 0.58-3.67, P = 0.007), shorter time to first flatus (WMD =-0.31 d, 95% CI: -0.53 to - 0.10 d, P = 0.005), and postoperative hospital days (WMD =-1.09, 95% CI: -1.92 to -0.25, P = 0.010) than the D2 group. Subgroup analysis suggested that the advantages from the D2 + CME group were obvious in traditional open radical gastrectomy, proximal gastrectomy, and distal gastrectomy compared with D2 group. The evaluations of post-operative complications showed that the patients who underwent D2 + CME had a lower incidence of post-operative complications than the patients who underwent D2 surgery alone (relative risk [RR] = 0.65, 95% CI: 0.45-0.87, P = 0.003). The D2 radical gastrectomy plus CME improved 3-year overall survival (OS) (RR = 1.16, 95% CI: 1.02-1.32, P = 0.020) and lowered the local recurrence rate (RR = 0.51, 95% CI: 0.28-0.94, P = 0.030). The patients undergoing laparoscopic surgery or total gastrectomy had more significant advantages compared between D2 + CME and D2 groups in 3-year OS.Conclusion:The data from China show that D2 radical gastrectomy plus CME are reliable procedures and safety compared to D2 radical gastrectomy with faster recovery, lower risk, and better prognosis.

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简介：Itisaresearchsubjectincomputervisionto3Dreconstructionofanobjectrepresentedbyasingle2Dlinedrawing.Previousworkson3Dreconstructionfrom2Dlinedrawingsfocusonobjectswithlines,plane,view,andsoon.Thispapermainlystudiesthe3Dreconstructionfrom2Dlinedrawings.Besides,anewapproachisproposed:itisthatfortheresearchofthepointcoordinatesof2Dlinedrawings,soastoachievetheobjectreconstructionbythereconstructionofpointcoordinates.Thereconstructionprocessincludes:①thecollectionofpointcoordinates(X,Y)of2Dlinedrawings;②thederivationofmathematicalformulaaboutthereconstructionofthepointof2Dlinedrawings,andcalculatingthecorrespondingpointofthe3Dcoordinates;③theregenerationof3Dgraphicswith3Dpoints;④analyzeerrorbytheproportionalofparallelofaxonometricprojection,inordertoprovetheaccuracyofthemethod.

简介：Intersil公司日前宣布它已签署了一项收购D2Audio公司的最终协议，后者是一家专门致力于为消费电子、汽车以及专业音频产品等应用领域提供数字音频功率放大器设计的创新领先厂商。至此，Intersil公司成为全球独家拥有智能数字音频功率放大器技术的厂商。

简介：D2X终于面世了．尼康的拥趸们不用再受佳能一族的嘲笑了。在上一场单反数字相机的战争中．尼康几乎在各档价格市场上都丢失了其领先地位——只有D70在与300D苦苦地较量。当然，佳能作为回应．推出了350D。

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简介：Wetackletheproblemofconstructing2DcentroidalVoronoitessellationswithconstraintsthroughanefficientandrobustconstructionofboundedVoronoidiagrams,thepseudo-dualoftheconstrainedDelaunaytriangulation.WeexploitthefactthatthecellsoftheboundedVoronoidiagramcanbeobtainedbyclippingtheordinaryonesagainsttheconstrainedDelaunayedges.Theclippingitselfisefficientlycomputedbyidentifyingforeachconstrainededgethe(connected)setoftriangleswhosedualVoronoiverticesarehiddenbytheconstraint.TheresultingconstructionisamenabletoLloydrelaxationsoastoobtainacentroidaltessellationwithconstraints.

简介：

简介：Resortingtocubicsplinefunctioninsteadofparametricsplinerepresentation,anexplicitfairnessindicatorandanefficientfairingalgorithmfor2Dcurvesarepresented.Theinputpointsequenceisfirstlypartitionedintoseveraloverlappedfunctionsegments.Foreachsegment,acubicsplinefunctionisusedastherepresentationtoolwhichentailsapolylineapproximationofcurvatureplot.Basedontheextrinsicrelationshipbetweenthepolylineandthepositionsofdatapoints,acoarse-to-finefaringmethodisproposedwhichefficientlyidentifiesandeliminatestheunnecessaryinflectionpoints.Ouralgorithmgeneratesthebestresultstodate,whichisvalidatedbynumerouspracticalexamples.

简介：Aseriesof2’-purineandpyrimidinederivativesof1’,4’-anhy-dro-2’-deoxy-D-arabitol(1)and1’,4’-anhydro-2’-deoxy-D-altritol(2)weresynthesizedregio-andstereo-selectivelyfromD-sorbitolthroughsomeconversioninhighyields.

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简介：X-rayimagingistheconventionalmethodfordiagnosingtheorthopedicconditionofapatient.ComputerizedTomography(CT)scanningisanotherdiagnosticmethodthatprovidespatient’s3Danatomicalinformation.However,bothmethodshavelimitationswhendiagnosingthewholeleg;X-rayimagingdoesnotprovide3Dinformation,andnormalCTscanningcannotbeperformedwithastandingposture.Obtaining3Ddataregardingthewholeleginastandingpostureisclinicallyimportantbecauseitenables3Danalysisintheweightbearingcondition.Basedontheseclinicalneeds,ahardware-basedbi-planeX-rayimagingsystemhasbeendeveloped;itusestwoorthogonalX-rayimages.However,suchmethodshavenotbeenmadeavailableingeneralclinicsbecauseofthehightcost.Therefore,weproposedawidelyadaptivemethodfor2DX-rayimageand3DCTscandata.Bythismethod,itispossibletothreedimensionallyanalyzethewholeleginstandingposture.TheoptimalpositionthatgeneratesthemostsimilarimageisthecapturedX-rayimage.Thealgorithmverifiesthesimilarityusingtheperformanceoftheproposedmethodbysimulation-basedexperiments.Then,weanalyzedtheinternal-externalrotationangleofthefemurusingrealpatientdata.Approximately10.55degreesofinternalrotationswerefoundrelativetothedefinedanterior-posteriordirection.Inthispaper,wepresentausefulregistrationmethodusingtheconventionalX-rayimageand3DCTscandatatoanalyzethewholelegintheweight-bearingcondition.

简介：【教学目标】1．语言知识目标（1）Masterthewordsandphrases;noodles，wouldlike，special，size，bowl，mutton，beef，cabbage，potato，order……（2）Mastertheexpressions;Whatwouldyoulike？I＇dlikesomenoodles．Whatkindofnoodleswouldyoulike？I＇dlikebeefnoodles．Whatsizewouldyoulike？I’dlikealargebowl，please．2．能力目标掌握情态动词would的用法，并能用wouldlike这一结构对食物进行询问并点餐。3．情感目标体会学习英语的乐趣，在小组合作与交流中，增长生活经验，促进人际交往，并养成良好的饮食习惯。【教学重点与难点】（一）重点1．学习日常生活中有关食物的名称。2．含有wouldlike的特殊疑问句及其回答。

简介：有了星友提供的故障原因，笔者下手自然就不会再通电测试了，而是直接拆机检查。