斷面壓縮率 的英文怎麼說
中文拼音 [duànmiànyāsuōlǜ]
斷面壓縮率
英文
reduction of cross sectional area-
In all kinds of complicated network, oriented linking and unlinking, communication frequency resource is strained, and bandwith to transmitting audio frequency signal is too restricted, complicated and fluky, while audio frequency data exponential have been increased in the last several years. under the circumstances, based on the research of predecessor, this paper studies wavelet analysis ' s maths gist and practices significance on signal process, and puts forward a optimized wavelet package condensation arithmetic to process audio frequency data, which gives attention to coding efficiency, multirate and compression delay. simulation experiment on the arithmetic has been done by matlab
針對無連接和面向連接的各種復雜網路環境下,通信頻帶資源緊張,音頻傳輸帶寬有限且復雜多變,而各種音頻數據又日益增多的局面,本文研究小波分析在信號處理方面的數學依據和在數據壓縮方面的實際意義,在前人不斷工作的基礎上,提出了一種優化小波包變換編碼方案用於音頻數據的壓縮演算法,兼考慮了編碼效率、多碼率和壓縮時延多個方面,並在matlab環境下做了模擬實驗,對各種音頻信號及多種小波函數做了模擬結果比較,實驗結果證明該演算法可以在一定計算復雜度下可以很好地改進壓縮效果,達到多碼率下實現實時編解碼的過程,在高速dsp晶元等硬體設備支持下,可以有效應用於實際復雜多變信源編碼。Sicp / al matrix composites, with 5, 15 and 25 % volume fraction of sic particles, were prepared by vacuum hot - pressing sintering processing in this paper. based on mechanics properties, sem observation and energy dispersive x - ray analysis, the interface reaction phenomenon of sicp / al composites made by vacuum hot - pressing sintering, as well as the reinforcement and fracture mechanisms of this composite were analyzed. the dynamic responses of sipc / al composites were studied by a split hopkinson high - speed pressure bar impact system which strain rate was from quasistatic state strain rate ( 3. 3 10 - 3s - 1 ) to dynamic state strain rate ( 5. 2 103 s - 1 )
本研究以武裝直升飛機防護裝甲材料為研究對象,採用真空熱壓粉末冶金燒結工藝制備了含sic顆粒體積分數分別為5 、 15和25的sic顆粒增強鋁基復合材料,結合其力學性能、掃描電鏡和界面微區能譜分析結果,分析了sic _ p al復合材料的真空燒結過程中的界面現象,以及材料增強和斷裂機理,並利用hopkinson高速壓桿沖擊實驗系統對其從靜態到動態(應變率為3 . 3 10 ~ ( - 3 ) s ~ ( - 1 ) 5 . 2 10 ~ 3s ~ ( - 1 ) )的壓縮破壞響應進行了研究,分析了不同體積分數sic _ p al復合材料高應變率壓縮載荷下,材料的變形和微觀損傷機理,以及利用高速沖擊空氣炮測定了改復合材料制備剃度復合板的穿透性能。In ovx rats, not only bone mineral density ( bmd ) of lumbar vertebrae in vivo and vitro, but also bmd of femora ( except for r3 region ) and proximal metaphysis ( r1 region ) in vitro decreased obviously ( p < 0. 01 ) , whose bone loss rates of l5 and l6 were the highest and achieved 13 % ; the trabeculae of ovx rats were few , fine, and discontinued and there were lacunae on the surface ; in ovx rats, both compressive strength of vertebral bodies and the mechanical properties of femora decreased ; the falling degree of the former was greater ; the maximal compressive power of lumbar vertebrae decreased with 33. 32 %
結果顯示:大鼠卵巢切除后,活體、離體腰椎以及股骨(除r3區) 、脛骨近端干骺端( r1區)的離體骨密度顯著下降( p < 0 . 01 ) ,離體l5和l6的骨丟失率最大,達13 % ;骨小梁減少、變細,連接中斷,骨小梁表面有吸收陷窩;腰椎壓縮強度和股骨力學性能均下降,前者更明顯,腰椎最大壓縮力下降率達33 . 32 % 。Moreover, a newly mpeg - 4 has become mature and a necessary basic standard for the implication of streaming media. with the high compress rate, high mutual ability and flexible scalable ability ; mpeg - 4 has a bright future for use in streaming media
另一方面,新一代的音視頻壓縮標準mpeg - 4不斷走向成熟,成為視頻應用的不可或缺的一個基礎標準,它具有的高壓縮率、強交互能力和靈活分級能力,使之在網路流媒體特別是視頻點播中擁有廣闊的應用前景。分享友人