target n. 靶子,標的;目標;(嘲笑等的)對象;笑柄 (for); (儲蓄,貿易等的)定額,指標;小羊的頸胸肉;【物理學】(X射線管中的)對陰極;【測】標桿,標板;【鐵路】圓板信號機;〔古語〕小圓盾。 a target area 轟炸目標地區。 a target ship 靶艦。 a target buster 〔美俚〕打飛靶的人。 target practice 打靶,射擊演習。 hit a target 達到定額[指標]。 one's target for tonight 〔英軍俚〕女友。
5 . on the study of the ballistic mechanism of fibre and composites , the ballistic properties are analyzed in details with the numeric experimental phenomenon and damage characters of composite targets , which suggests the excellent ballistic performance of kevlar composite arms 5 、對纖維的防彈機理、復合材料的防彈機理進行了探索性研究,綜合了大量試驗現象和眾多復合材料靶板的破壞特征,進行了防彈性能分析,從理論上說明了芳綸復合裝甲的優異防彈性能。
With the material dynamic constitutive equation including damage and the effect of stain rate the predictable formula about ballistic limit velocity of fiber composite target . secondly based on the damage feature about ceramic / fiber composite target caused by impact load , analysis model about defense performance of ceramic / composite material target is formed and the predictable formula about ballistic limit velocity is also given . lastly using the reflection and projectile theory of stress wave the paper discusses the design of ceramic / composite material target , optimizes the design of double layer ceramic / composite targets , gains optimal coefficient under certain area density and discusses the variety relationship of area density and thickness with optimal coefficient u nder some ballistic limit velocity 3 首先,分析了纖維類正交鋪層復合靶板在沖擊載荷作用下的損傷破壞機理,結合包含損傷和應變率效應的材料動態本構方程,建立了纖維復合材料板彈道極限速度的預測公式;其次,根據陶瓷/纖維材料復合靶板在沖擊載荷下的破壞特點,建立了陶瓷/復合材料靶板抗彈性能分析模型,給出了彈道極限速度預測公式;最后,利用應力波反射和透射理論討論了陶瓷/復合材料靶板的設計問題,對雙層陶瓷復合靶板的優化設計進行了分析,給出了在一定面密度下的最佳優化系數,討論了一定彈道極限速度下的面密度和厚度隨優化系數的變化關系。
Ge - sio2thin films were prepared by an rf co - sputtering technique on p - si substrates from a ge - sio2 composite target . the as - deposited films were annealed in the temperature range of 300 - 1000 under nitrogen ambience . the structure of films was evaluated by x - ray diffraction ( xrd ) , x - ray photoernission spectroscopy ( xps ) 當溫度較低時(沉積時的基片溫度ts 450 ,后處理退火溫度ta 800時,制備的樣品均為非晶結構,當溫度較高時( ts 450 , ta 800 )薄膜樣品中才出現si的結晶顆粒。
In this paper , we reported the structural and luminescent properties of si - based oxide films containing semiconductor si , ge or metal al powders prepared by a dual - ion - beam co - sputtering method ( si - sio2 films and al - si - sio2 films ) or rf magnetron sputtering technique ( ge - sio2 films ) , and analyze the pl and el mechanism . 1 . the composite films of si - sio2 films were prepared by dual ion beam co - sputtering method from a composite target in argon atmosphere 我們利用雙離子束共濺射和射頻磁控共濺射技術制備了一系列含有半導體si 、 ge顆粒及金屬顆粒al的薄膜,即si - sio _ 2薄膜、 ge - sio _ 2薄膜和al - si - sio _ 2薄膜,分別對它們的結構、光吸收以及發光性質進行了研究。
Firstly on the basis of twin shear unified strength theory and spherical cavity expand theory it is established the expression about target defense force , given the equations of rod projectile penetrate and impact velocities on ceramic / composite target under the same pressure and verified through the experiment . secondly the analysis model of ceramic / grfp / steel composite multi - layer target penetrate depth employing above differential equation of target defense force , penetrate velocity and rod velocity . there are two team of experiments which testify separately the penetrate depth and effect with different length - to - diameter 首先,基于雙剪統一強度理論和球型空穴膨脹理論建立了靶板抗力表達式,并通過壓力相等條件給出了桿式彈侵徹陶瓷復合靶板的侵徹速度與撞擊速度的表達式,最后用試驗進行了驗證;其次,利用上面的靶板抗力表達式、侵徹速度、彈桿速度的微分方程,建立了陶瓷/玻璃鋼/鋼板復合多層靶板侵徹深度分析模型,分兩組試驗對侵徹深度、不同長徑比的侵徹效果進行了驗證;最后,建立了桿式彈垂直侵徹陶瓷多層復合靶板的工程模型,給出了預測靶板抗彈性的k 。