火鸟捕鱼机多少钱一台

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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無處不在的科學學習：第十二屆館校結合科學教育論壇論文集

科技場館和學校是培養青少年科學素質的主要陣地，肩負著推動教育改革、實施創新驅動發展的重要責任。如何充分調動科技場館和學校的優勢資源、有效促進科技場館與學校的深度融合，是館校結合科學教育工作的核心議題。本書是第十二屆館校結合科學教育論壇評審出的入選論文合集，以“新形勢下館校結合科學教育：無處不在的科學學習”為主題，內容涉及科技場館與學校合作的國際現狀、科技場館與學校合作的新思路與新模式、科學教育評測的內容與方法、校外科學教育環境下科學教師專業發展、科普研學與青少年科學學習等。

·29.1萬字

TED1小時科普：給孩子的世界啟蒙書

AI時代洶涌而來，作為家長，只有引導孩子廣泛地認知世界，多元地理解世界，構建起面向未來的世界觀，才能更好地適應這個瞬息萬變的時代。《TED1小時科普：給孩子的世界啟蒙書》由TED官方出品，內容融合自然科學與社會科學2大領域，涉及天文學、地質學、古生物學、國際關系和未來問題5大板塊，帶領孩子從時間和空間兩個維度全方位、立體地漫游世界，了解世界的過去與未來，發現萬物之間的聯系，認清自己在宇宙和社會中的位置，構建起跨學科的知識體系和受益一生的未來世界觀。愿孩子們看遍世界，都找到自己的路。套書全5冊，包含《為恐龍正名》《小行星獵人》《沸騰的河》《在逃之人》《未來問題》。

·25.7萬字

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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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科技創新啟示錄：創新與發明大師軼事

科普教育與科技創新是社會進步的兩翼。本書將近百位學術大師的創新故事和科研智慧娓娓道來，和讀者共同探討了“創新”這一經久不衰的話題，以喚起讀者的創新熱情或帶來點滴啟示。科技創新，本該是抽象的、晦澀的、復雜的，但在書中，它變成了“哈里森的航海鐘”、“達爾文的旅行”、“波爾與愛因斯坦的爭論”、“麥克斯韋與法拉第的忘年交”……每一個陌生或熟悉的故事，向讀者展示的不僅是科技創新的歷程與成果，更傳遞著創新所需的知識素質與精神內核，這是創新的之根、之道、之法。

·24.3萬字

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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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