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P-51 Mustang

為了解決Drag的問題，作者Oliver, David 這樣論述：

Designed and produced by North American Aviation in response to a British order for aircraft in 1940, the P-51 Mustang went on to become one of the most successful aircraft in the Second World War and beyond. In this fascinating book, aircraft expert David Oliver tells the story of this innovativ

e and adaptable aircraft, from the early versions used by the RAF as low-level reconnaissance aircraft to the long-range USAAF fighters that accompanied US daylight bombers over Germany. The Mustang was also used by numerous other air forces. The author shows how, from its inception, the Mustang inc

luded innovative features such as a low-drag laminar-flow wing and a low-drag engine-cooling system. Beginning with an Allison engine, early versions of the Mustang were used by the RAF for low-level reconnaissance missions. Later versions, fitted with the more powerful Rolls-Royce Merlin engine, we

re capable of high-level combat missions against the best German fighters. Mustangs were also employed in ground-attack and ’tank-busting’ missions. Accompanied by a wide variety of colour and black and white images, this highly readable and informed book is an essential briefing on a remarkable air

craft.

Drag進入發燒排行的影片

I Understand Everything Better

為了解決Drag的問題，作者 這樣論述：

Anexpansive documentation of David Neumann/Advanced Beginner Group’s 2015 ＂deeplyfelt and deeply moving＂ (New York Times)performance piece, a multi-disciplinary, dance-based work that explored theimpulse to report on calamity, the shimmer of attention to realms unseen, andthe evidence of the body as

possessing a will to let go of living. David Neumann’s work as a freelance choreographer, director and performerincludes a wide range of projects and disciplines. Since 1999, Neumann hasworked behind the scenes to craft plays, operas, films and multi-disciplinaryperformances. From avant-garde the

ater to blockbuster films, classic opera tonew musicals, David’s diverse experience has given him a unique ability to articulateideas through performers’ bodies. Whether playing one of Shakespeare’s kings ora virus-infected zombie with an appetite for Will Smith, the performers Neumannworks with gai

n from his multi-layered approach. David coaches individuals, hasmoved dozens of people through city streets, staged a hundred musical numbers, directed puppets, friends and drag queens, organized multiple Greek chorusesand continues to find new ways for the human body to communicate. He has workedw

ith stars from the ballet, film and avant-garde worlds, as well as those neverhaving stepped on a stage, learning valuable lessons from each. Neumann hasmany years of teaching experience working at Juilliard, NYU, Princeton and Yaleand is currently a tenured professor in the Theatre Department at Sa

rah Lawrence College. He has received threeLucille Lortel Award nominations and one Fichandler for his work on Cabaret atArena Stage. He is the Artistic Director of ’Advanced Beginner Group’, amulti-disciplinary performance company, which has been awarded three BessieAwards. He is a 2019 Lucille Lor

tel, Outer Critics Circle, and Tony Awardnominee, as well as the recipient of the 2019 Chita Rivera Award forChoreography for his work on the Broadway musical, ’Hadestown’. Recent and upcomingprojects include the musical ’Swept Away’ at Berkeley Rep, and choreography andcoaching for ’A Marriage Stor

y’, starring Scarlett Johanssen and Adam Driver.Advanced Beginner Group has created three evening length pieces performed in New York at The Kitchen, New York Live Arts, the Chocolate Factory and Abrons ArtsCenter, and on tour at The Walker Arts Center, MASS MoCA, MCA at Chapel Hill, and Alverno Col

lege, to name a few. ABG has been awarded several grants andawards, including three NY Dance and Performance ＂Bessie＂ awards. AdvancedBeginner Group has embarked on another evolutionary shift, in aco-collaboration with theater artist, Marcella Murray on their new piece, ’Distances Smaller Than This

Are Not Confirmed’ which premiered at Abrons ArtsCenter in January, 2020. David Neumann/Advanced Beginner Group embarkson each piece through an organic process begun from scratch, bringing to word, action, and proximity a delighted embrace of our contradictory lives.Contradiction is best felt throug

h humor and it is with a strategic use ofhumor that the work confronts our darker impulses and actions. ABG searches forantidotes to the absolutes that separate us, and so create these works as anirrational response to our perceived place in the universe. In each work, Neumann attempts to uncover a

distinct and complex view of the humanexperience. He embraces contradiction and juxtaposition as a means toward anactive engagement with the audience where performer and observer alike aregiven the potential to find themselves in a more alert state, more open to thesubtleties of their day-to-day exp

erience. To even approach this desiredcomplexity, the work is necessarily multi-disciplinary, as Neumann aims thevarious approaches and disciplines toward one another, and through theircollisions, bend the habitual gestures around new shapes. As adance/theater maker, Neumann focuses his efforts on t

he borders of theintellectual and the phenomenological, the representational and the abstract, and the personal and the cosmological with the intention to make blurry our desire to live inside distinct categories, binaries, and absolutes. David Neumann and Advanced Beginner Group desire an awakened

state, full of surprise, wonder, and humor without ignoring our pain, ennui, and existential longings.

超疏水性在結露狀況下對氣冷式熱交換器性能的影響

為了解決Drag的問題，作者莫尼實 這樣論述：

濕空氣冷凝是熱管理系統中常見的過程，在冷凍空調循環中尤為重要，冷凝現象發生於當熱交換器，特別是蒸發器，在低於空氣露點的溫度下操作時。此現象將會導致鰭片側的冷凝液滴(膜)滯留(retention)與橋接(bridging),進而造成風機壓降與能耗的增加。本研究旨在開發一種超疏水熱交換器，通過其疏水特性，最大限度地減少冷凝水的滯留和橋接。本研究提出一種新型的超疏水性鰭片換熱器設計構想，採用傾斜鰭片排列以達到最小壓降和最大節能效果。本研究從熱傳與壓降性能的觀點切入，將新型超疏水性傾斜鰭片換熱器與其他換熱器作比較分析，分別為：超疏水水平鰭片換熱器、親水性傾斜鰭片換熱器、與親水性水平鰭片換熱器。此外，

本研究藉由改變不同的操作條件，如：進氣溫度、相對濕度和鰭片間距，對這四種換熱器進行性能測試。親水和超疏水換熱器中分別以膜狀冷凝和滴狀冷凝模式為主。由於其表面的高潤濕性，親水換熱器會有較大的液滴脫落直徑。相比之下，超疏水換熱器中發生的 Cassie-Baxter 液滴模式，促使了較小的液滴脫落直徑。本研究建立了一個力平衡模型來分析液滴脫落直徑，模型參數包括了表面張力、慣性力與重力對液滴的影響。本研究基於韋伯數(We)與邦德數(Bo)與液滴脫落直徑，引入了一個新的無因次參數( )，該無因次參數 可預測表面的凝結水脫落能力，在給定的鰭片間距下， 越小代表凝結水脫落能力越好。研究結果表明，滴狀冷凝的

超疏水換熱器在濕空氣下的冷凝熱傳性能相較膜狀冷凝的親水性換熱器並未有顯著的提升，此結果可歸因於非凝結性氣體效應。然而，在壓降方面，超疏水性換熱器與親水性換熱器相比，可帶來高達70%的壓降降低，大幅提升節能效果。壓降的降低歸因於聚結誘發的液滴跳躍現象，使得冷凝水連續脫落。