Firstly, this paper summarizes modern weaponry stealth technology at home and abroad, and lays special emphasis on analyzing stealth problem of cruise missile ’ s guidance head cover, aerocraft radar canopy and other privileged sites. secondly it makes a research on related theories of transparent metallic mesh that applied to missile ’ s guidance head cover and aerocraft radar canopy, and deduces relational expression between transparent metallic mesh structural parameters and radar wave - shielding efficiency, infrared transmitting. we use laser direct writing technique to fabricate a metallic mesh ( dimension : 70mm 70mm ; line width : 5 m ; period : 350 m ) on glass surface, then do experiment to test radar wave - shielding of metallic mesh via radar transmitting and receiving device
本文首先綜述了國內外現代武器系統隱身技術方法;重點對巡航導彈導引頭罩和飛機雷達艙罩等特殊部位的隱身問題進行了研究,研究了金屬網
柵用於導彈頭罩和飛機雷達艙罩隱身的相關理論,推導了金屬網
柵結構參數對雷達波
屏蔽效率和透紅外關系式;用激光直寫工藝,在玻璃表面上製作了一塊面積為70mm 70mm ,線寬為5 m ,線周期為350 m的金屬網
柵;在實驗室里用雷達發射和接收裝置測試了網
柵對雷達波的
屏蔽實驗;認為利用金屬網
柵技術對雷達波具有一定的
屏蔽作用,而且不影響精確制導的紅外線高效透過。
Connectors with assessed quality, for use in d. c., low - frequency analogue and in digital high speed data applications - printed board connectors - detail specification for two - part connectors with shielding and a basic grid of 2, 5 mm - cable to board connectors, shielded against emc, grid 2, 5 mm, for high speed data rates, for use with printed boards
經過質量評定的直流低頻模擬及數字高速數據系統用連接器.印製電路板連接器.帶
屏蔽和2 . 5mm基
柵的兩件式連接器詳細規范.同印製板一起使用的高速數據傳輸率emc
屏蔽防護和2 . 5mm
柵格的電路板連接器電纜
The original x design was done before outline rasterizers were used to generate screen fonts. the only fonts available were bitmaps, and the idea of providing scaled versions of those for the screen lacked appeal
在最初設計x時,輪廓光
柵還未被用於產生
屏幕字體。當時僅有位圖字體可用,且沒有對放縮字體的需求。
Connectors for electronic equipment - part 4 - 114 : printed board connectors ; detail specification for two - part connector with integrated shielding function having a grid of 1 mm x 1, 5 mm
電子設備連接器.第4 - 114部分:印製板連接器.格
柵為1mm x 1 . 5mm的有整體
屏蔽功能的兩件式連接器詳細規范
Connectors for electronic equipment - printed board connectors with assessed quality - detail specification for two - part connector with integrated shielding function having a grid of 1 mm x 1, 5 mm
電子設備用連接器.經質量評定的印製板連接器.格
柵為1mmx1 . 5mm的有整體
屏蔽功能的兩件式連接器詳細規范
It has broad application prospect in the following fields such as microelectronics, photoelectronic devices, large screen flat panel display, field emitter array, acoustic surface wave device, photon crystal, light waveguide array, holographic honeycomb lens and micro - optical element array, micro - structure manufacture, fabrication of large area grating and grid of high resolution, photoresist performance testing, profile measurement and metrology, etc. the paper only involves the primary research of interferometric lithography
在微電子、光電子器件、大
屏幕平板顯示器、場發射器陣列、表面聲波器件、光子晶體、光波導陣列、全息透鏡和微光學元件陣列、微結構製造,高分辨、大面積光
柵和網格製造,在抗蝕劑性能測試、面形測量和計量等領域,干涉光刻技術都具有廣闊的應用前景。
The apparatus designed with digital displayer, cd or mp3 player, you can enjoy music and massage in one time
本機配置藍
屏液晶顯示, cd或mp3播放
柵,可進行音樂互動按摩。
The influence of metallic mesh packing block on radar wave shielding is only dependent on packing block material ’ s surface electric resistance, independent on other factors of material. the less surface electric resistance is, the better metallic mesh ’ s shielding effect is
而且金屬網
柵襯層對雷達波
屏蔽作用的影響只與襯層材料的面電阻有關,與材料其它因素無關,面電阻越小,網
柵的
屏蔽效果越好。
Minimise the negative visual impact of these supporting structures by using infill panels such as brick or ornate metal screens. introduce suitable landscaping with tall trees and hanging plants to screen the stilted structures
在支柱之間豎立
柵欄,例如磚欄或裝飾性金屬圍
屏,以填滿空間,務求盡量減低這些外露支柱對景觀所造成的影響。
So he set his ear to the crack and listened, and listened, and listened, and the steps a - scraping around out there all the time ; and at last he nudged us, and we slid out, and stooped down, not breathing, and not making the least noise, and slipped stealthy towards the fence in injun file, and got to it all right, and me and jim over it ; but tom s britches catched fast on a splinter on the top rail, and then he hear the steps coming, so he had to pull loose, which snapped the splinter and made a noise ; and as he dropped in our tracks and started somebody sings out
隨后他把耳朵貼在門縫上,聽啊,聽啊,聽啊,可是四下里一直有腳步聲。到最後,他用胳膊后捅了捅我們,我們便溜了出來,弓著腰,
屏住了呼吸,不發任何一點點兒聲音,一跟著一個,輕手輕腳,朝
柵欄走去,平平安安地走到了
柵欄邊,我和傑姆跨過了
柵欄,可是湯姆的褲子給
柵欄頂上一根橫木裂開的木片給絆住了,他聽到腳步聲在走攏來,他使勁扯,啪地一聲把木片扯斷了。他跟在我們後面跑。
This paper utilizes masking rate theory to analyze the variation of center zero - level energy, the influence of metallic mesh ’ s different parameters on infrared transmitting ; deduces the relational expression between infrared transmitting efficiency and metallic mesh ’ s parameters ; comes to the conclusion that we can improve infrared transmitting efficiency by increasing
理論研究表明,金屬網
柵的周期選擇在200 ~ 400 m之間,線寬不大於10 m ,是較為理想的網
柵參數。最後,在實驗室里用1 ~ 20ghz的信號發生器、功率放大器和頻譜分析儀等雷達波檢測設備,對金屬網
柵的
屏蔽效率進行測試。
The complex situation of flight requests that the graphics display of cockpit must be dynamic, real - time and legible. but in the raster graphic display system, scale lines and character will be distorted seriously owe to the limited screen resolution in the case of deflection, which affect the display quality. the thesis based on the research of the last graduate student improves the graphics creating arithmetic more and puts forward more effective arithmetic on scale lines and character for high display quality
由於飛行狀態復雜,要求座艙內畫面顯示動態、實時、清晰。而硬體系統採用的是光
柵圖形顯示,字元和刻度線的旋轉受
屏幕解析度的限制存在著鋸齒走樣現象,影響顯示效果。本文在上一屆研究生研究的基礎上,在圖形生成演算法上加以進一步改進,重點在刻度線、字元的反走樣處理上,研究出了更合理的演算法,提高了圖形顯示質量。
The visual sense that the installation railings the brought protective screen had already been reduced, more can the hungry safety of active protection working personnel and nation property
既減少了安裝
柵欄所帶來的視覺
屏障,更能有效的保護工作人員和國家財產的餓安全。
This paper uses the theory of equivalent circuit and equivalent membrane to analyze the influence of metallic mesh on radar wave shielding, deduce the relational expression between shielding efficiency and metallic mesh ’ s width, period
用等效電路模型和等效膜理論,分析了金屬網柵結構參數對雷達波屏蔽作用的影響,推導出了屏蔽效率與金屬網柵周期和線寬的關系式。