指向區寬度 的英文怎麼說
中文拼音 [zhǐxiàngqūkuāndù]
指向區寬度
英文
course width-
First, it was taken that a discuss about the effects of geometry parameters of each piezocrystal on direction parameters ( main lobe width, side lobe amplitude, elimination of grating lobes ), amplitude of ultrasonic pressure, element viberation pattern, mutual radiation among elements, efficient test regions, ability to keep accurate and near - field distance and so on. based on the direction of ultrasonic field in ulpa deduced by ourselves. in addition, on the base of integrating all kinds of factors, it was put forward that the principle and method for optimized design of geometry parameters of piezocrystals in ulpa transducer, and its design programme and interface were compiled
首先在推導超聲相控線陣換能器聲場的指向性的基礎上，就各個晶片幾何參數對指向性指標（主瓣寬度、旁瓣幅度、消除柵瓣） 、聲壓幅值、陣元振動模式、陣元間互輻射、有效檢測區域、精確控制能力、近場長度等方面的影響進行了論述，並在綜合各方面影響的基礎上，提出了晶片幾何參數優化設計的原則和方法，編寫了設計程序和界面。On the base of above it, this paper discuss the synthesis of optimum distributed arrays by nonuniform spacing in the sense of dolph - chebyshev. having derived the equations of optimum element distribution, we analyze the exponentially spaced array, which are optimum when the elements are isotropic and equally weighted, and the array by general raised cosine function. the formulate for estimating the sidelobe envelope, beamwidth of the array pattern and clean region width are obtained
推導了最佳陣元分佈方程，分別對陣元無方向性和等加權時的最佳分散式陣列? ?指數間隔陣列和採用廣義升餘弦加權的最佳分散式陣列進行了分析，推導了天線方向圖旁瓣包絡、波束寬度，干凈掃描區寬度的估計公式，給出了近軸旁瓣電平與陣列參數的關系。In the light of the pulse width of the radar wave, this paper deals with the difference and the relationship between the vertical resolution and the transverse resolution of the ground - penetrating radar, indicates the influence of the noise upon the resolution and, with practical examples, points out that the digital handling of the signal can greatly improve the resolution of the radar
摘要從雷達波脈沖寬度出發，闡述垂直解析度與橫向解析度的區別和相互關系，並同時指出噪音對解析度的影響，用實例說明訊號的數字處理能大大的改善解析度。After that, the multifractal spectra dq - q are computed by fixed - mass method. the results show that in the studied scaling range different types of landscapes and profiles in different directions perform different fractal properties, that is, the d value and crossover length ^ decrease in turns with the landform type from high - moutain, mid - low mountain to basin, and the profile parallel to wear grooves often has lower d values ( < 1. 5 ) than those perpendicular to wear grooves do ( 1. 5 ) in the same section
提出以地貌分形特點和渡越長度為依據的地貌層次界定方案，研究指出了5km左右應為宏觀臨界點：不同構造地貌區、不同取向的剖線的多重分形譜值域范圍寬窄表現出中低山區高山區盆地區，垂直構造地貌斜坡方向斜交方向平行方向的特點，表明了內外營力作用的不均勻性和方向性。The conclusions are as follows : the ultrasonic intensity is proportion to the laser intensity ; the ultrasonic induced by a laser line source has much more advantages than by a laser point source, such as stronger energy, higher snr, more directivity and shape ; the intensity of cfpi ' s output signal is linear with ultrasonic vibration velocity, and is effected by incidence angle and scattered angle ; snr will increase by reducing cfpi ' s bandwidth, reducing incidence angle, increasing cavity ' s length and reflectivity
在分析點光源激勵聲表面波機理的基礎上，求出了線光源激勵的超聲振動的位移表達式，發現線光源激勵的近場區表面波具有波形好，信噪比高，指向性好，幅度強等特點。通過理論推導，得出共焦fabry - perot干涉儀的輸出光強除了與樣品表面的振動速度成正比，並與入射角和散射角有關；適當減小cfpi的帶寬，增加腔長，增大鏡面反射率，或者減小檢測入射角都可以提高系統的信噪比。Firstly, this paper introduces the general situation of the gem, then it shows a successful and failing example of the oversea " second boards. after that it suggests the design and the policy of our gem, then it specially points out the mainly drawback of the establishment of our gem at present, such as the drawback of policy and system, market mechanism, the company which will come into the market, agency organization, person with ability, the main body structure of investment, the misunderstand of investers, the investment system of carving out, the organization of capital market, the hardware establishment and so on. at last, it analyses the preparation of government, company which will come into the market and vary agency, then points out that it will take at least one or two years to establish the gem
本文首先介紹了創業板市場的概況，然後介紹了海外創業板的成功典型和失敗案例，最後提出我國創業板的模式設計和政策取向，重點指出我國當前設立創業板的主要障礙，諸如政策和制度環境不寬松，市場機制存在障礙，上市公司主體存有缺陷，中介機構的服務有待提高，人才匱乏較突出，投資主體結構存在問題，廣大投資者認識存在誤區，創業投資體系有待發展，資本市場結構存在障礙，硬體設施不夠先進等問題，並在此基礎上對我國設立創業板前政府，欲上市企業及中介券商等方方面面應作哪些準備及時機選擇進行了分析，最後指出我國創業板的設立還有待時日，至少也需一至兩年。The changes of the length and the width of streets are reflected by the first axis of the two - dimensional ordination diagram of dca and the changes of the human disturbance and habitat types by the other one. using diversity indices, the analysis shows mat human disturbances and habitat types are influential factors for the street grassland type diversity
第一軸表示道路寬度和長度變化；第二軸反映綠地類別從路心池綠地類別向便道綠地類別變化以及生境由車輛干擾向行人干擾變化採用豐富度指數、多樣性指數和均勻度指數對城區街道植被的街道綠地類別多樣性的分析結果表明：街道綠地類別多樣性受到行人干擾、城區生境類型等因素不同程度的影響。分享友人