Achecksumisanalgorithmthatscansapacketofdataandreturnsasinglenumber.Theideaisthatifthepacketischanged,thechecksumwillalsochange,sochecksumsareoftenusedfordetectingtransmissionerrors,validatingdocumentcontents,andinmanyothersituationswhereitisnecessarytodetectundesirablechangesindata.Forthisproblem,youwillimplementachecksumalgorithmcalledQuicksum.AQuicksumpacketallowsonlyuppercaselettersandspaces.Italwaysbeginsandendswithanuppercaseletter.Otherwise,spacesandletterscanoccurinanycombination,includingconsecutivespaces.AQuicksumisthesumoftheproductsofeachcharacter'spositioninthepackettimesthecharacter'svalue.Aspacehasavalueofzero,whilelettershaveavalueequaltotheirpositioninthealphabet.So,A=1,B=2,etc.,throughZ=26.HereareexampleQuicksumcalculationsforthepackets"ACM"and"MIDCENTRAL":ACM:1*1+2*3+3*13=46MIDCENTRAL:1*13+2*9+3*4+4*0+5*3+6*5+7*14+8*20+9*18+10*1+11*12=650InputTheinputconsistsofoneormorepacketsfollowedbyalinecontainingonly#thatsignalstheendoftheinput.Eachpacketisonalinebyitself,doesnotbeginorendwithaspace,andcontainsfrom1to255characters.OutputForeachpacket,outputitsQuicksumonaseparatelineintheoutput.SampleInputACMMIDCENTRALREGIONALPROGRAMMINGCONTESTACNACMABCBBC#SampleOutput46650469049751415

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Theupdatedrevisionofthewell-respectedbookonanalyzingaircraftperformance,ThisSecondEditionofthebestsellingAircraftControlandSimulationhasbeenexpandedandupdatedtoincludethelatesttechnologicaladvancesinthefield.Inaddition,anewsectiononbasicaerodynamics,aircraftconfiguration,andstaticstabilitymakesthiscomplexmaterialmoreaccessibletobeginners.,Thiscomprehensiveguidediscussesthefundamentalprinciplesandtheoryofaircraftcontrolandsimulation.Italsocoversmodelinganddynamicanalysis,stabilityevaluation,multivariablecontroltheory,andcomputer-aideddesigntechniques.Theinclusionoftopicsfromgeodesyandgravitationlaysthegroundworkforadiscussionofthetheoryforsuborbitalaircraftnowunderdevelopment.,Specialfeaturesofthisneweditioninclude:,*NewandupdatedcomputercalculationsusingMATLAB(r),*Anewsectiononbasicaerodynamics,aircraftconfigurations,andstaticstability,*CoverageofnewMIMOdesigntechniques,robustnesstheory,andnonlineardesign,Completewithexamplesofactualdesignsfromtheaircraftindustryplusexerciseproblems,AircraftControlandSimulation,SecondEditionisanexcellentreferenceforanyoneinvolvedinthedesignandmodelingofaerospacevehiclesandanoutstandingtextforbothundergraduatesandgraduatestudents.

Simulationsimplemodelsandcomparisonwithqueueingtheory.AndreiDorokhovThreesimplequeueingmodelsM/M/1,M/G/1andseriesofM/M/1havebeensimulated,andcomparedwithcalculationsbasedonqueueingtheoryforvalidationpurposes.

RF系统设计，PCB阻抗计算WhatisAppCAD?“AppCADisaneasy-to-useprogramthatprovidesyouwithauniquesuiteofRFdesigntoolsandcomputerizedApplicationNotestomakeyourwirelessdesignjobfasterandeasier.AppCAD'sunique,interactiveapproachmakesengineeringcalculationsquickandeasyformanyRF,microwave,andwirelessapplications.AppCADisusefulforthedesignandanalysisofmanycircuits,signals,andsystemsusingproductsfromdiscretetransistorsanddiodestoSiliconandGaAsintegratedcircuits.ThekeywordforAppCADiseasy-nocircuitfiles,nomanuals-justquickandeasy.“

ConvexAnalysisandMinimizationAlgorithmsIIAdvancedTheoryandBundleMethodsAuthors:Hiriart-Urruty,Jean-Baptiste,Lemarechal,ClaudeFromthereviews:"Theaccountisquitedetailedandiswritteninamannerthatwillappealtoanalystsandnumericalpractitionersalike...theycontaineverythingfromrigorousproofstotablesofnumericalcalculations....oneofthestrongfeaturesofthesebooks...thattheyaredesignednotfortheexpert,butforthosewhowhishtolearnthesubjectmatterstartingfromlittleornobackground...therearenumerousexamples,andcounter-examples,tobackupthetheory...Tomyknowledge,nootherauthorshavegivensuchacleargeometricaccountofconvexanalysis.""Thisinnovativetextiswellwritten,copiouslyillustrated,andaccessibletoawideaudience"

ChangesforthethirdeditionThebiggestchangeforthisneweditionistheadditionofChapters20–23onnonparametricmodeling.OthermajorchangesincludeweaklyinformativepriorsinChapters2,5,andelsewhere;boundary-avoidingpriorsinChapter13;anupdateddiscussionofcross-validationandpredictiveinformationcriteriainthenewChapter7;improvedconvergencemonitoringandeffectivesamplesizecalculationsforiterativesimulationinChapter11;presentationsofHamiltonianMonteCarlo,variationalBayes,andexpectationpropagationinChapters12and13;andnewandrevisedcodeinAppendixC.Wehavemadeotherchangesthroughout.

XGM2019eisacombinedglobalgravityfieldmodelrepresentedthroughspheroidalharmonicsuptod/o5399,correspondingtoaspatialresolutionof2’(~4km).AsdatasourcesitincludesthesatellitemodelGOCO06sinthelongerwavelengthareacombinedwithterrestrialmeasurementsfortheshorterwavelengths.TheterrestrialdataitselfconsistsoverlandandoceanofgravityanomaliesprovidedbycourtesyofNGA(identicaltoXGM2016,havingaresolutionof15’)augmentedwithtopographicallyderivedgravityoverland(EARTH2014).Overtheoceans,gravityanomaliesderivedfromsatellitealtimetryareused(DTU13,inconsistencywiththeNGAdataset).Thecombinationofthesatellitedatawiththeterrestrialobservationsisperformedbyusingfullnormalequationsuptod/o719(15’).Beyondd/o719,ablock-diagonalleast-squaressolutioniscalculatedforthehigh-resolutionterrestrialdata(fromtopographyandaltimetry).Allcalculationsareperformedinthespheroidalharmonicdomain.Inthespectralbanduptod/o719thenewmodelshowsoverlandaslightlyimprovedbehavioroverprecedingmodelssuchasXGM2016,EIGEN6c4orEGM2008whencomparingittoindependentGPSlevelingdata.Overlandandinthespectralrangeaboved/o719theaccuracyofXGM2019eslightlysuffersfromthesoleuseoftopographicforwardmodelling;Hence,errorsareincreasedinwell-surveyedareascomparedtomodelscontainingrealgravitydata,e.g.EIGEN6c4orEGM2008.However,theperformanceofXGM2019ecanbeconsideredasgloballymorehomogeneousandindependentfromexistinghighresolutionglobalmodels.Overtheoceansthemodelexhibitsanimprovedperformancethroughoutthecompletespectrum(equalorbetterthanprecedingmodels).

Mapleisacomputerprogramcapableofperformingawidevarietyofmathematicaloperations.Itoriginatedintheearly1980sasacomputeralgebrasystem,buttodaythisdescriptiondoesn’treallydoitjustice.Maplehasfacilitiesforalgebra,calculus,linearalgebra,graphics(twoandthree-dimensionalplots,andanimations),numericalcalculationstoarbitraryprecision,andmanyotherthingsbesides.Itiswidelyusedinuniversitiesacrosstheworld,andisparticularlyusefulfortasksthataretediousanderror-pronewhenperformedbyhumans,suchasmanipulatingcomplicatedseriesexpansionsandsolvinglargesetsofsimultaneousequations.Usedcorrectly,Maplecansavetimeandquicklysolveproblemsthatwouldotherwisebeintractable.Usedincorrectly,itcanleadtofrustration,andthedestructionofexpensiveITequipment.Atthetimeofwriting,thecurrentversionisMaple2016.VersionsbeforeMaple2015werenumberedstartingfrom1;thelastofthesewasMaple18.Newfeaturesintroducedineachversionfro妹妹aple4.0onwardscanbeviewedusingthehelpsystem(seeSection2.2).Forthemostpart,recentchangeshavebeenrelativelyminor,atleastasfarasthematerialinthisbookisconcerned.Consequently,alloftheexamplesworkwithbothMaple2015andMaple2016.Infact,mostwillworkinolderversionsaswell,thoughnaturallythenumberofexceptionsincreasesthefurtherbackonegoes.Twosubstantialnewfeaturesarethedataplotco妹妹and,discussedinSection6.6,andthenewrulesconcerningterminatingcharacters,describedinAppendixB(seealsoSection2.3).BothofthesewereintroducedinMaple2015.

（含源码及报告）本程序分析了自2016年到2021年（外加）每年我国原油加工的产量，并且分析了2020年全国各地区原油加工量等，含饼状图，柱状图，折线图，数据在地图上显示。
运转本程序需要requests、bs4、csv、pandas、matplotlib、pyecharts库的支持，如果缺少某库请自行安装后再运转。
文件含6个excel表，若干个csv文件以及一个名字为render的html文件（需要用浏览器打开），直观的数据处理部分是图片以及html文件，可在地图中显示，数据处理的是excel文件。
不懂可以扫文件中二维码在QQ里面问。

在日常工作中，钉钉打卡成了我生活中不可或缺的一部分。然而，有时候这个看似简单的任务却给我带来了不少烦恼。 每天早晚，我总是得牢记打开钉钉应用，点击"工作台"，再找到"考勤打卡"进行签到。有时候因为工作忙碌，会忘记打卡，导致考勤异常，影响当月的工作评价。而且，由于我使用的是苹果手机，有时候系统更新后，钉钉的某些功能会出现异常，使得打卡变得更加麻烦。 另外，我的家人使用的是安卓手机，他们也经常抱怨钉钉打卡的繁琐。尤其是对于那些不太熟悉手机操作的长辈来说，每次打卡都是一次挑战。他们总是担心自己会操作失误，导致打卡失败。 为了解决这些烦恼，我开始思考是否可以通过编写一个全自动化脚本来实现钉钉打卡。经过一段时间的摸索和学习，我终于成功编写出了一个适用于苹果和安卓系统的钉钉打卡脚本。