贴吧牛牛是什么意思

本書是作者根據初學者的心理特點及學習要求而編寫的，全書先后講述了電子元器件的基本知識、模擬電子技術、脈沖與數字技術等內容。全書從實用角度出發，采用圖話式講解方法，通過師徒對話，逐步引出知識精髓，輕松做到讓初學者在一個月內掌握電子元器件及電子技術的主體內容。該書適應高職院校、中職學校電子專業學生使用，也適應電子專業短期培訓班學員使用。當作為教材時，根據學員基礎的不同，可按90～120課時教學。這是一本專門講述電子元件和電子技術的專業圖書，全書一反常態，按日安排學習內容，力求在一個月內讓讀者輕松掌握電子技術的基本知識。全書共由三部分內容構成，第1～9日主要講述電子元器件，內容涵蓋電阻器、電容器、電感器、變壓器、壓電元件、二極管、三極管、場效應管、晶閘管、光電耦合器、集成電路、電磁繼電器等元器件的識別、應用及檢測；第10～23日主要講述模擬電子技術，內容涵蓋各種放大器的結構及工作過程、各類正弦波振蕩器的結構及工作過程、串聯穩壓源的結構及工作過程、無線電波等內容；第24～30日主要講述脈沖與數字技術，內容涵蓋各種脈沖電路、門電路、邏輯代數、組合邏輯電路、時序邏輯電路等。

·9001字

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武俠數學

石器時代的原始人怎樣數數？零和阿拉伯數字是怎樣產生并傳入中國的？古人怎樣理解小數和負數？祖沖之用什么工具推算圓周率？數學的推算有什么實際功能，能帶來什么樣的樂趣？古代中國的數學在當時世界上有何獨特之處，與現代數學課堂有哪些不同？這些問題，都可以由郭靖、黃蓉、楊過、小龍女等武俠人物來作答。鑒于計算機編程方興未艾，許多省份的高考數學和中考數學試卷都將編程納入考點，本書里也有一些用計算機編程解決傳統數學問題的示例，讓沒有接觸過編程的讀者初步了解程序思維的妙用。

·8.8萬字

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北京山區河流生態修復技術指南

本指南收集整理了北京山區河（溝）道生態修復實施的主要成果，以文字說明、設計圖、效果照片等形式對各項生態工程技術加以歸納總結，主要包括生態河流、河（溝）道生態調查、監測與評價、河（溝）道生態修復目標與技術、河（溝）道生態修復措施配置、河（溝）道生態恢復措施示范、生態效益評估等內容，對山區河（溝）道生態修復具有較強的實踐指導意義。

·2萬字

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飲用水水源環境風險評估與管理

本書從理論層面分析了飲用水水源面臨的各類風險、歸納了相應的評估模型，提出了基于產業布局優化、環境監控改善等的風險控制策略和分級分類管理方法，并結合自身實踐，以典型飲用水水源為案例，介紹了污染物風險（環境健康風險、生態風險）和污染源風險評價和管理的具體應用。全書理論結合實際，突出技術性和應用性，反映了我國現階段飲用水源環境保護的工作重點。本書適用于水環境管理人員及高等院校和科研院所從事環境水利學、環境科學、環境生態學、水文學及水資源、城市科學等科研工作人員的閱讀，也可以作為高等院校研究生和本科生的專業輔助教材。

·11.4萬字

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不焦慮的數學：孩子怎么學，家長怎么教

本書講述了小學和初中階段數學學習法、學習習慣和解題思路，針對計算能力提升、知識難點講解、數學思想應用和培養，為小學和初中階段家長提升家庭輔助教育水平，以及初中學生實現自學與自練，提供了切實可行、容易上手的方法和思路，解決數學學習和教育中的種種困難，讓大家不再盲從和焦慮。本書適合小學和初中階段的家長和數學教師閱讀，亦可作為學生本人提升數學水平的指導。

·18.1萬字

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Digital Forensics with Kali Linux

Thisbookistargetedatforensicsanddigitalinvestigators,securityanalysts,oranystakeholderinterestedinlearningdigitalforensicsusingKaliLinux.BasicknowledgeofKaliLinuxwillbeanadvantage.

·3.6萬字

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Hands-On Blockchain with Hyperledger

BBlockchainandHyperledgertechnologiesarehottopicstoday.HyperledgerFabricandHyperledgerComposerareopensourceprojectsthathelporganizationscreateprivate,permissionedblockchainnetworks.Thesefindapplicationinfinance,banking,supplychain,andIoTamongseveralothersectors.ThisbookwillbeaneasyreferencetoexploreandbuildblockchainnetworksusingHyperledgertechnologies.Thebookstartsbyoutliningtheevolutionofblockchain,includinganoverviewofrelevantblockchaintechnologies.YouwilllearnhowtoconfigureHyperledgerFabricandbecomefamiliarwithitsarchitecturalcomponents.Usingthesecomponents,youwilllearntobuildprivateblockchainnetworks,alongwiththeapplicationsthatconnecttothem.Startingfromprinciplesfirst,you’lllearntodesignandlaunchanetwork,implementsmartcontractsinchaincodeandmuchmore.Bytheendofthisbook,youwillbeabletobuildanddeployyourowndecentralizedapplications,handlingthekeypainpointsencounteredintheblockchainlifecycle.

·10.8萬字

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Blockchain Quick Reference

BlockchainQuickReferencetakesyouthroughtheelectrifyingworldofblockchaintechnologyandisdesignedforthosewhowanttopolishtheirexistingknowledgeregardingthevariouspillarsoftheblockchainecosystem.Thisbookisyourgo-toguide,teachingyouhowtoapplyprinciplesandideasformakingyourlifeandbusinessbetter.Youwillcoverthearchitecture,InitialCoinOfferings(ICOs),tokens,smartcontracts,andterminologiesoftheblockchaintechnology,beforestudyinghowtheywork.Allyouneedisacuriousmindtogetstartedwithblockchaintechnology.Onceyouhavegraspedthebasics,youwillexplorecomponentsofEthereum,suchasethertokens,transactions,andsmartcontracts,inordertobuildsimpleDapps.YouwillthenmoveontolearningwhySolidityisusedspecificallyforEthereum-basedprojects,followedbyexploringdifferenttypesofblockchainwitheasy-to-followexamples.Allthiswillhelpyoutacklechallengesandproblems.Bytheendofthisbook,youwillnotonlyhavesolvedcurrentandfutureproblemsrelatingtoblockchaintechnologybutwillalsobeabletobuildefficientdecentralizedapplications.

·7.9萬字

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Mastering Arduino

MasteringArduinoisanall-in-oneguidetogettingthemostoutofyourArduino.Thispractical,no-nonsenseguideteachesyoualloftheelectronicsandprogrammingskillsthatyouneedtocreateadvancedArduinoprojects.Thisbookispackedfullofreal-worldprojectsforyoutopracticeon,bringingalloftheknowledgeinthebooktogetherandgivingyoutheskillstobuildyourownrobotfromtheexamplesinthisbook.Thefinaltwochaptersdiscusswirelesstechnologiesandhowtheycanbeusedinyourprojects.Thebookbeginswiththebasicsofelectronics,makingsurethatyouunderstandcomponents,circuits,andprototypingbeforemovingon.Itthenperformsthesamefunctionforcode,gettingyouintotheArduinoIDEandshowingyouhowtoconnecttheArduinotoacomputerandrunsimpleprojectsonyourArduino.Oncethebasicsareoutoftheway,thenext10chaptersofthebookfocusonsmallprojectscenteredaroundparticularcomponents,suchasLCDdisplays,steppermotors,orvoicesynthesizers.Eachofthesechapterswillgetyoufamiliarwiththetechnologyinvolved,howtobuildwithit,howtoprogramit,andhowitcanbeusedinyourownprojects.

·7.5萬字

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The Modern C# Challenge

C#isamulti-paradigmprogramminglanguage.TheModernC#Challengecoverswithaspectsofthe.NETFrameworksuchastheTaskParallelLibrary(TPL)andCryptoAPI.Italsoencouragesyoutoexploreimportantprogrammingtrade-offssuchastimeversusspaceorsimplicity.Theremaybemanywaystosolveaproblemandthereisoftennosinglerightway,butsomesolutionsaredefinitelybetterthanothers.Thisbookhascombinedthesesolutionstohelpyousolvereal-worldproblemswithC#.Inadditiontodescribingprogrammingtrade-offs,TheModernC#Challengewillhelpyoubuildausefultoolkitoftechniquessuchasvaluecaching,statisticalanalysis,andgeometricalgorithms.Bytheendofthisbook,youwillhavewalkedthroughchallengesinC#andexploredthe.NETFrameworkinordertodevelopprogramlogicforreal-worldapplications.

·7.7萬字

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Blockchain Developer's Guide

Blockchainapplicationsprovideasingle-sharedledgertoeliminatetrustissuesinvolvingmultiplestakeholders.ItisthemaintechnicalinnovationofBitcoin,whereitservesasthepublicledgerforBitcointransactions.BlockchainDeveloper'sGuidetakesyouthroughtheelectrifyingworldofblockchaintechnology.Itbeginswiththebasicdesignofablockchainandelaboratesconcepts,suchasInitialCoinOfferings(ICOs),tokens,smartcontracts,andotherrelatedterminologies.YouwillthenexplorethecomponentsofEthereum,suchasEthertokens,transactions,andsmartcontractsthatyouneedtobuildsimpleDApps.BlockchainDeveloper'sGuidealsoexplainswhyyoumustspecificallyuseSolidityforEthereum-basedprojectsandletsyouexploredifferentblockchainswitheasy-to-followexamples.Youwilllearnawiderangeofconcepts-beginningwithcryptographyincryptocurrenciesandincludingethersecurity,mining,andsmartcontracts.YouwilllearnhowtousewebsocketsandvariousAPIservicesforEthereum.BytheendofthisLearningPath,youwillbeabletobuildefficientdecentralizedapplications.ThisLearningPathincludescontentfromthefollowingPacktproducts:BlockchainQuickReferencebyBrennHill,SamanyuChopra,PaulValencourt.BuildingBlockchainProjectsbyNarayanPrusty.

·12.5萬字

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Blockchain for Business 2019

BlockchainforBusiness2019isacomprehensiveguidethatenablesyoutobringinvariousblockchainfunctionalitiestoextendyourexistingbusinessmodelsandmakecorrectfully-informeddecisions.Youwilllearnhowdecentralizedapplicationsaretransformingnumerousbusinesssectorsthatareexpectedtoplayahugeroleinthefuture.Youwillseehowlargecorporationsarealreadyimplementingblockchaintechnologynow.Youwillthenlearnaboutthevariousblockchainservices,suchasBitcoin,Ethereum,Hyperledger,andotherstounderstandtheirusecasesinavarietyofbusinessdomains.Youwilldevelopasolidfundamentalunderstandingofblockchainarchitecture.Movingahead,youwillgettogripswiththeinnerworkingsofblockchain,withdetailedexplanationsofmining,decentralizedconsensus,cryptography,smartcontracts,andmanyotherimportantconcepts.Youwilldelveintoarealisticviewofthecurrentstateofblockchaintechnology,alongwithitsissues,limitations,andpotentialsolutionsthatcantakeittothenextlevel.Bytheendofthisbook,youwillallbewellversedinthelatestinnovationsanddevelopmentsintheemergingblockchainspace.

·6萬字

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Hands-On Blockchain for Python Developers

Blockchainisseenasthemaintechnologicalsolutionthatworksasapublicledgerforallcryptocurrencytransactions.Thisbookservesasapracticalguidetodevelopingafull-fledgeddecentralizedapplicationwithPythontointeractwiththevariousbuildingblocksofblockchainapplications.Hands-OnBlockchainforPythonDevelopersstartsbydemonstratinghowblockchaintechnologyandcryptocurrencyhashingworks.Youwillunderstandthefundamentalsandbenefitsofsmartcontractssuchascensorshipresistanceandtransactionaccuracy.Asyousteadilyprogress,you'llgoontobuildsmartcontractsusingVyper,whichhasasimilarsyntaxtoPython.Thisexperiencewillfurtherhelpyouunraveltheotherbenefitsofsmartcontracts,includingreliablestorageandbackup,andefficiency.You'llalsouseweb3.pytointeractwithsmartcontractsandleveragethepowerofboththeweb3.pyandPopulusframeworktobuilddecentralizedapplicationsthatoffersecurityandseamlessintegrationwithcryptocurrencies.Asyouexplorelaterchapters,you'lllearnhowtocreateyourowntokenontopofEthereumandbuildacryptocurrencywalletgraphicaluserinterface(GUI)thatcanhandleEthereumandEthereumRequestforComments(ERC-20)tokensusingthePySide2library.Thiswillenableuserstoseamlesslystore,send,andreceivedigitalmoney.Towardtheend,you'llimplementInterPlanetaryFileSystem(IPFS)technologyinyourdecentralizedapplicationtoprovideapeer-to-peerfilesystemthatcanstoreandexposemedia.Bytheendofthisbook,you'llbewell-versedinblockchainprogrammingandbeabletobuildend-to-enddecentralizedapplicationsonarangeofdomainsusingPython.

·8.8萬字

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Improving your C# Skills

ThisLearningPathshowsyouhowtocreatehighperformingapplicationsandsolveprogrammingchallengesusingawiderangeofC#features.You’llbeginbylearninghowtoidentifythebottlenecksinwritingprograms,highlightcommonperformancepitfalls,andapplystrategiestodetectandresolvetheseissuesearly.You'llalsostudytheimportanceofmicro-servicesarchitectureforbuildingfastapplicationsandimplementingresiliencyandsecurityin.NETCore.Then,you'llstudytheimportanceofdefiningandtestingboundaries,abstractingawaythird-partycode,andworkingwithdifferenttypesoftestdouble,suchasspies,mocks,andfakes.Inadditiontodescribingprogrammingtrade-offs,thisLearningPathwillalsohelpyoubuildausefultoolkitoftechniques,includingvaluecaching,statisticalanalysis,andgeometricalgorithms.ThisLearningPathincludescontentfromthefollowingPacktproducts:C#7and.NETCore2.0HighPerformancebyOvaisMehboobAhmedKhan.PracticalTest-DrivenDevelopmentusingC#7byJohnCallaway,ClaytonHunt.TheModernC#ChallengebyRodStephens.

·12萬字

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Hyperledger Cookbook

Hyperledgerisanopen-sourceprojectandcreatesprivateblockchainapplicationsforarangeofdomains.Thisbookwillbeyourdeskreferenceasyouexplorecommonandnot-so-commonchallengesfacedwhilebuildingblockchainnetworksusingHyperledgerservices.We'llworkthroughallHyperledgerplatformmodulestounderstandtheirservicesandfeaturesandbuildend-to-endblockchainapplicationsusingvariousframeworksandtoolssupportedbyHyperledger.Thisbook'sindependent,recipe-basedapproach(packedwithreal-worldexamples)willfamiliarizeyouwiththeblockchaindevelopmentcycle.Frommodelingabusinessnetworktointegratingwithvarioustools,youwillcoveritall.We'llcovercommonandnot-so-commonchallengesfacedintheblockchainlifecycle.Later,we'lldelveintohowwecaninteractwiththeHyperledgerFabricblockchain,coveringalltheprinciplesyouneedtomaster,suchaschaincode,smartcontracts,andmuchmore.We'llalsoaddressthescalabilityandsecurityissuescurrentlyfacedinblockchaindevelopment.Bytheendofthisbook,youwillbeabletoimplementeachrecipetoplan,design,andcreateafull-fledged,private,decentralizedapplicationtomeetorganizationalneeds.

·4.9萬字

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Mastering Ethereum

Ethereumisoneofthecommonlyusedplatformsforbuildingblockchainapplications.It'sadecentralizedplatformforapplicationsthatcanrunexactlyasprogrammedwithoutbeingaffectedbyfraud,censorship,orthird-partyinterference.Thisbookwillgiveyouadeepunderstandingofhowblockchainworkssothatyoucandiscovertheentireecosystem,corecomponents,anditsimplementations.YouwillgetstartedbyunderstandinghowtoconfigureandworkwithvariousEthereumprotocolsfordevelopingdApps.Next,youwilllearntocodeandcreatepowerfulsmartcontractsthatscalewithSolidityandVyper.YouwillthenexplorethebuildingblocksofthedAppsarchitecture,andgaininsightsonhowtocreateyourowndAppthroughavarietyofreal-worldexamples.ThebookwillevenguideyouonhowtodeployyourdAppsonmultipleEthereuminstanceswiththerequiredbestpracticesandtechniques.Thenextfewchapterswilldelveintoadvancedtopicssuchas,buildingadvancedsmartcontractsandmulti-pagefrontendsusingEthereumblockchain.Youwillalsofocusonimplementingmachinelearningtechniquestobuilddecentralizedautonomousapplications,inadditiontocoveringseveralusecasesacrossavarietyofdomainssuchas,socialmediaande-commerce.Bytheendofthisbook,youwillhavetheexpertiseyouneedtobuilddecentralizedautonomousapplicationsconfidently.

·10.3萬字

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Advanced Blockchain Development

Blockchaintechnologyisadistributedledgerwithapplicationsinindustriessuchasfinance,government,andmedia.ThisLearningPathisyourguidetobuildingblockchainnetworksusingEthereum,JavaScript,andSolidity.Youwillgetstartedbyunderstandingthetechnicalfoundationsofblockchaintechnology,includingdistributedsystems,cryptographyandhowthisdigitalledgerkeepsdatasecure.Furtherintothechapters,you’llgaininsightsintodevelopingapplicationsusingEthereumandHyperledger.AsyoubuildonyourknowledgeofEthersecurity,mining,smartcontracts,andSolidity,you’lllearnhowtocreaterobustandsecureapplicationsthatrunexactlyasprogrammedwithoutbeingaffectedbyfraud,censorship,orthird-partyinterference.Towardtheconcludingchapters,you’llexplorehowblockchainsolutionscanbeimplementedinapplicationssuchasIoTapps,inadditiontoitsuseincurrencies.TheLearningPathwillalsohighlighthowyoucanincreaseblockchainscalabilityandevendiscussesthefuturescopeofthisfascinatingandpowerfultechnology.BytheendofthisLearningPath,you'llbeequippedwiththeskillsyouneedtotacklepainpointsencounteredintheblockchainlifecycleandconfidentlydesignanddeploydecentralizedapplications.ThisLearningPathincludescontentfromthefollowingPacktproducts:MasteringBlockchain-SecondEditionbyImranBashir.BuildingBlockchainProjectsbyNarayanPrusty.

·13.2萬字

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水的反思

我們每天都需要水，但對水資源認識有多少？本書是水利權威李焯芬教授專著的普及讀物，以豐富權威的數據，帶我們深入分析水資源應用和污染的現況，從倡議要從人定勝天的思維，轉變為人天和諧的新思維，使讀者對用水的態度，有了新的體會。

·3.1萬字

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星空獵人

每個人小時候都有一個夢想。作者的夢想就是在天上找到一顆屬于自己的星星。經過多年辛勞，在沙漠飽歷風霜，多番失敗與嘗試，結果成為世界業余小行星獵人世界第二人，共發現了二千多顆小行星。

·5.6萬字

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生物標本采集與制作

《生物標本采集與制作》簡要介紹動植物標本采集基礎上，重點闡述干制標本制作、浸制標本制作、動物剝制標本制作、骨骼標本制作、透明骨骼標本制作以及生物玻片標本制作，還介紹作物病蟲害標本、鳥卵和鳥類胚胎標本等特殊生物標本的制作，也涉及了生物標本的保管和維護、組織培養與常用實驗動物飼養等內容。書中對動植物標本的采集與制作步驟和操作方法作了詳盡闡述，圖文并茂，便于初學者學習掌握。本書可供大專院校生物科學、生物技術專業課程教學或研究參考，也特別適合生物標本制作初學者查閱。

·13.6萬字

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電子元器件與電路一月通（第3版）