LoNDRA [COMPUTERS ＆ SCIENCE]
4件中 1件 - 4件
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| 商品 | 説明 | 価格 |
|---|---|---|
 Darbe Patlama Motoru Londra'dan New York'a 8 Saat Yerine 45 Dakikada Nas?l Gidece?iz?【電子書籍】[ Fouad Sabry ] 楽天Kobo電子書籍ストア | ＜p＞＜strong＞Darbe Patlama Motoru Nedir?＜/strong＞＜/p＞ ＜p＞Darbe patlatma motoru (PDE), yak?t ve oksitleyici kar???m?n? yakmak i?in patlama dalgalar?n? kullanan bir t?r tahrik sistemidir. Motor darbelidir, ??nk? her patlama dalgas? ile bir sonraki aras?nda kar???m?n yanma odas?nda yenilenmesi gerekir. Teorik olarak, bir PDE, sesalt?ndan yakla??k Mach 5 hipersonik u?u? h?z?na kadar ?al??abilir. ?deal bir PDE tasar?m?, turbojetler ve turbofanlar gibi di?er tasar?mlardan daha y?ksek bir termodinamik verimlili?e sahip olabilir, ??nk? bir patlama dalgas? kar???m? h?zla s?k??t?r?r ve sabit hacimde ?s? ekler. . Sonu? olarak, motorda kompres?r makaralar? gibi hareketli par?alar gerekli de?ildir, bu da toplam a??rl??? ve maliyeti ?nemli ?l??de azaltabilir. PDE'ler 1940'tan beri tahrik i?in d???n?lm??t?r. Daha fazla geli?tirme i?in temel konular aras?nda yak?t ve oksitleyicinin h?zl? ve verimli bir ?ekilde kar??t?r?lmas?, kendili?inden tutu?man?n ?nlenmesi ve bir giri? ve meme ile entegrasyon yer al?r.＜/p＞ ＜p＞Bug?ne kadar, pratik bir PDE ?retime al?nmad?, ancak birka? test yata?? motoru in?a edildi ve bunlardan biri, 2008'de s?rekli PDE destekli u?u?ta u?an d???k h?zl? bir g?steri u?a??na ba?ar?yla entegre edildi. Haziran 2008'de, Savunma Geli?mi? Ara?t?rma Projeleri Ajans? (DARPA), bu teknolojiyi Mach 6'ya varan h?zlara ula?mak i?in kullanmas? ama?lanan Blackswift'i tan?tt?＜/p＞ ＜p＞＜strong＞Nas?l Yararlanacaks?n?z＜/strong＞＜/p＞ ＜p＞(I) A?a??daki konularla ilgili bilgiler ve do?rulamalar:＜/p＞ ＜p＞B?l?m 1: Darbeli Patlama Motoru＜br /＞ B?l?m 2: N?kleer Darbeli Tahrik＜br /＞ B?l?m 3: D?ner Patlama Motoru＜br /＞ B?l?m 4: AIMStar＜br /＞ B?l?m 5: Antimadde- katalize n?kleer darbe tahriki＜br /＞ B?l?m 6: Antimadde roketi＜br /＞ B?l?m 7: N?kleer elektrikli roket＜br /＞ B?l?m 8: Uzayda n?kleer g??＜br /＞ B?l?m 9: N?kleer tahrik＜br /＞ B?l?m 10: N?kleer termal roket＜br /＞ B?l?m 11: Pluto Projesi＜br /＞ B?l?m 12: Fisyon par?as? roketi＜/p＞ ＜p＞(II) Darbeli patlatma motoru hakk?nda en ?ok sorulan sorular? yan?tlamak.＜br /＞ (III) Darbeli patlatma motorunun bir?ok alanda kullan?m?na ili?kin ger?ek d?nyadan ?rnekler.＜br /＞ (IV) K?saca a??klamak i?in 17 ek , Darbeli patlatma motoru teknolojilerini 360 derece tam olarak anlamak i?in her sekt?rde 266 geli?en teknoloji.＜/p＞ ＜p＞＜strong＞Bu Kitap Kimler ??in＜/strong＞＜/p＞ ＜p＞Profesyoneller, lisans ve y?ksek lisans ??rencileri, merakl?lar, hobiler ve her t?rl? darbe patlatma motoru i?in temel bilgi veya bilgilerin ?tesine ge?mek isteyenler.＜/p＞画面が切り替わりますので、しばらくお待ち下さい。 ※ご購入は、楽天kobo商品ページからお願いします。※切り替わらない場合は、こちら をクリックして下さい。 ※このページからは注文できません。 | 700円 |
 Motore A Detonazione A Impulsi Come faremo a viaggiare da Londra a New York in 45 minuti invece di 8 ore?【電子書籍】[ Fouad Sabry ] 楽天Kobo電子書籍ストア | ＜p＞＜strong＞Cos'? il motore a detonazione a impulsi＜/strong＞＜/p＞ ＜p＞Un motore a detonazione a impulsi (PDE) ? un tipo di sistema di propulsione che utilizza onde di detonazione per bruciare la miscela di carburante e ossidante. Il motore ? pulsato perch? la miscela deve essere rinnovata nella camera di combustione tra ogni onda di detonazione e la successiva. In teoria, un PDE pu? funzionare da subsonico fino a una velocit? di volo ipersonico di circa Mach 5. Un design PDE ideale pu? avere un'efficienza termodinamica superiore rispetto ad altri progetti come turboreattori e turbofan perch? un'onda di detonazione comprime rapidamente la miscela e aggiunge calore a volume costante . Di conseguenza, le parti mobili come le bobine del compressore non sono necessariamente necessarie nel motore, il che potrebbe ridurre significativamente il peso e i costi complessivi. Le PDE sono state prese in considerazione per la propulsione dal 1940. Le questioni chiave per un ulteriore sviluppo includono la miscelazione rapida ed efficiente del carburante e dell'ossidante, la prevenzione dell'autoaccensione e l'integrazione con un ingresso e un ugello.＜/p＞ ＜p＞Ad oggi, nessun PDE pratico ? stato messo in produzione, ma sono stati costruiti diversi motori di prova e uno ? stato integrato con successo in un velivolo dimostrativo a bassa velocit? che ha volato in un volo a motore PDE sostenuto nel 2008. Nel giugno 2008, la Difesa La Advanced Research Projects Agency (DARPA) ha presentato Blackswift, che avrebbe dovuto utilizzare questa tecnologia per raggiungere velocit? fino a Mach 6＜/p＞ ＜p＞＜strong＞Come ne trarrai beneficio＜/strong＞＜/p＞ ＜p＞(I) Approfondimenti e convalide sui seguenti argomenti:＜/p＞ ＜p＞Capitolo 1: Motore a detonazione a impulsi＜br /＞ Capitolo 2: Propulsione nucleare a impulsi＜br /＞ Capitolo 3: Motore a detonazione rotante＜br /＞ Capitolo 4: AIMStar＜br /＞ Capitolo 5: Antimateria- propulsione nucleare catalizzata a impulsi＜br /＞ Capitolo 6: Razzo ad antimateria＜br /＞ Capitolo 7: Razzo nucleare elettrico＜br /＞ Capitolo 8: Energia nucleare nello spazio＜br /＞ Capitolo 9: Propulsione nucleare＜br /＞ Capitolo 10: Razzo termico nucleare＜br /＞ Capitolo 11: Progetto Plutone＜br /＞ Capitolo 12: Razzo a frammenti di fissione＜/p＞ ＜p＞(II) Rispondere alle principali domande pubbliche sul motore a detonazione a impulsi.＜br /＞ (III) Esempi del mondo reale per l'utilizzo del motore a detonazione a impulsi in molti campi.＜br /＞ (IV) 17 appendici per spiegare brevemente , 266 tecnologie emergenti in ogni settore per avere una comprensione completa a 360 gradi delle tecnologie dei motori a detonazione a impulsi.＜/p＞ ＜p＞＜strong＞A chi ? rivolto questo libro＜/strong＞＜/p＞ ＜p＞Professionisti, studenti universitari e laureati, appassionati, hobbisti e coloro che vogliono andare oltre le conoscenze o le informazioni di base per qualsiasi tipo di motore a detonazione a impulsi.＜/p＞画面が切り替わりますので、しばらくお待ち下さい。 ※ご購入は、楽天kobo商品ページからお願いします。※切り替わらない場合は、こちら をクリックして下さい。 ※このページからは注文できません。 | 700円 |
 Science in Black and White How Biology and Environment Shape Our Racial Divide【電子書籍】[ Alondra Oubre ] 楽天Kobo電子書籍ストア | ＜p＞This unflinching expose of racially biased research--the Alt-Right's "scientific wing"--debunks both old and emerging claims of inborn racial disparities.Racial groups differ in some of their social patterns, but the cause of those differences--nature versus nurture, or genetics versus environment-- remains fiercely debated. For the pro-nature camp-- sometimes aligned with white nationalism and eugenics, and often used to promote ideas of racial inferiority and superiority -- race-based biological determinism contributes significantly to the ethnic divide, especially the black/white gap in societal achievement. By contrast, pro-nurture supporters attribute ethnic variation in social outcomes primarily to environmental circumstances, ecological conditions, and personal experience. In this thoroughly researched book, science writer Alondra Oubre examines emerging scientific discoveries that show how both biology and environment interact to influence IQ--intelligence performance--and social behaviors across continental populations, or human races. She presents compelling evidence for why environmental and certain non-DNA-related biological phenomena overall seem to best explain black/white disparities in a gamut of social behaviors, including family structure, parenting, educational attainment, and rates of violent crime. As she demonstrates, nature still matters, but the biology that impacts racial variance in social behaviors extends beyond genetics to include other processes--epigenetics, gene expression, and plasticity--all of which are profoundly affected by a wide array of environmental forces. The complex, synergistic interplay of these factors combined, rather than just genes or just environment, appears to account for black/white divergence in a gamut of social behaviors.＜/p＞画面が切り替わりますので、しばらくお待ち下さい。 ※ご購入は、楽天kobo商品ページからお願いします。※切り替わらない場合は、こちら をクリックして下さい。 ※このページからは注文できません。 | 2,719円 |
 The Social Life of DNA Race, Reparations, and Reconciliation After the Genome【電子書籍】[ Alondra Nelson ] 楽天Kobo電子書籍ストア | ＜p＞＜strong＞The unexpected story of how genetic testing is affecting race in America＜/strong＞＜/p＞ ＜p＞We know DNA is a master key that unlocks medical and forensic secrets, but its genealogical life is both revelatory and endlessly fascinating. Tracing genealogy is now the second-most popular hobby amongst Americans, as well as the second-most visited online category. This billion-dollar industry has spawned popular television shows, websites, and Internet communities, and a booming heritage tourism circuit.＜/p＞ ＜p＞The tsunami of interest in genetic ancestry tracing from the African American community has been especially overwhelming. In ＜em＞The Social Life of DNA＜/em＞, Alondra Nelson takes us on an unprecedented journey into how the double helix has wound its way into the heart of the most urgent contemporary social issues around race.＜/p＞ ＜p＞For over a decade, Nelson has deeply studied this phenomenon. Artfully weaving together keenly observed interactions with root-seekers alongside illuminating historical details and revealing personal narrative, she shows that genetic genealogy is a new tool for addressing old and enduring issues. In ＜em＞The Social Life of DNA＜/em＞, she explains how these cutting-edge DNA-based techniques are being used in myriad ways, including grappling with the unfinished business of slavery: to foster reconciliation, to establish ties with African ancestral homelands, to rethink and sometimes alter citizenship, and to make legal claims for slavery reparations specifically based on ancestry.＜/p＞ ＜p＞Nelson incisively shows that DNA is a portal to the past that yields insight for the present and future, shining a light on social traumas and historical injustices that still resonate today. Science can be a crucial ally to activism to spur social change and transform twenty-first-century racial politics. But Nelson warns her readers to be discerning: for the social repair we seek can’t be found in even the most sophisticated science. Engrossing and highly original, ＜em＞The Social Life of DNA＜/em＞ is a must-read for anyone interested in race, science, history and how our reckoning with the past may help us to chart a more just course for tomorrow.＜/p＞画面が切り替わりますので、しばらくお待ち下さい。 ※ご購入は、楽天kobo商品ページからお願いします。※切り替わらない場合は、こちら をクリックして下さい。 ※このページからは注文できません。 | 2,136円 |