This paper starts the research of the liquid floated pendulous accelerometer testing system according to the engineering. at first, this paper gives the brief introduction of the history and present status of accelerometer and its testing technology, the working principium and math model of the liquid floated pendu - lous accelerometer, and then, decides the binary width pulse force retrim loop as the design proposal of testing system, researches the transfer function of every part in the system emphasizly, analyses the stability of the whole accelerometer testing system from the angle of control theoretics by the open loop transfer function of system, and designed the correcting net, analyses the basal problems such as resolution, sampling restraint, precision and so on, designs the hardware testing circuits such as preamplification, band - pass filter, alternating amplifier, phase sensitive demodulatorn, pulse - width modulation, frequency scale circuit, moment current generator. finally, using the graphics program language labv - iew which is designed for testing field especially by ni accomplishes the solfware design of testing system, realized the testing functions
首先對加速度計及其測試技術的發展歷史和現狀,液浮擺式加速度計的工作原理和數學模型等作了簡要的介紹,然後確定了以二元調
寬脈沖再平衡測試迴路為設計方案,並從控制理論的角度進行了分析,著重研究了系統中各部分的傳遞函數,利用系統開環傳遞函數分析了系統的穩定性,同時設計了系統的校正網路;分析了二元調
寬脈沖再平衡測試迴路的解析度、采樣約束以及測試精度等基本問題,並按照系統分析的結果設計了包括前置放大、帶通濾波、交流放大、相
敏解調、脈
寬調制、頻標電路以及力矩電流發生器等測試系統各部分硬體電路,驗證了電路的正確性,最後按照測試系統的要求,採用了美國ni公司專為測試領域所開發的虛擬儀器工具? ? labview作為測試軟體開發工具,利用該圖形化編程語言完成了測試系統軟體部分的設計,實現了測試功能。
We took the scroll wheel one step further with an eye - catching translucent look and a wider design, which makes it fun to scroll through files
使用這種新式滑鼠將為您帶來更多樂趣,更
寬且更靈
敏的滾輪可以更快速地瀏覽文件,完全不需要使用卷動軸。
Can read pdf 417, macro pdf 417 2d, upc, ean, code 39. . . thursday 28 june, 2007
超
寬讀取角度,可讀取pdf417 macro pdf417二維條碼upc ean code39 . ,耐摔性高,解讀靈
敏
In order to make up the deficiency, the science workshop datalogger made in the u. s pasco company has been used in this dissertation. the advantage of the datalogger has been extruded by the research of experiments for verification, inquiring experiments and application experiments which worked in the catalogue of the new physics courses for teaching. as a result, a fine acuity perceptional and observational ability of student will be developed, a cognitive framework will be improved, the space for investigative learning will be enlarged, multiple intelligences will be optimized and brain memory structures will be consolidated if the datalogger has been used in teaching physics experiments
數據採集器作為一種現代化設備運用於物理實驗教學,國外的研究資料已證明具有巨大的優勢,而國內才開始起步還沒有形成一個系統,為了彌補不足,本文採用美國pasco公司生產的scienceworkshop數據採集器系統設計實驗,從教學角度出發並配合物理新課程的總目標,分別從驗證性實驗、探究性實驗、應用性實驗三方面設計實驗,突出了數據採集器的優勢:即培養學生精細
敏銳的感知和觀察能力,改善學生的認知結構,拓
寬學生探究性學習的空間,優化學生的多元智力和強化學生的大腦記憶結構。
Relationship between the gyro ’ s bandwidth and sensitivity and the resonant frequency differential ratio is derived through frequency analysis. the bandwidth of the gyro increases as the resonant frequency differential ratio increases ; but the sensitivity decreases as the resonant frequency differential ratio increases
增大驅動軸和
敏感軸之間諧振頻率的頻差,可以增加微陀螺的帶
寬,但是降低了微陀螺的靈
敏度,這為設計石英音叉結構參數時,確定驅動軸和
敏感軸諧振頻率提供了指導依據。
A polytyramine film was electrochemically obtained for the immomilization of god and an overoxidised polypyrrole film was used for eliminating the interferences from other electroactive materials. the sensor show a linear response to - d - glucose over a concentration range of 1 10 ~ ( - 5 ) 1. 8 10 - 2 mol / l, and the detection limit was 5 10 ~ ( - 6 ) mol / l
應用這種方法製作的電極具有響應時間短( < 10s ) 、響應范圍
寬( 0 . 01 18mmol / l ) 、靈
敏度高、穩定性好等優點,並具有抗抗壞血酸、抗尿酸、抗果糖干擾的特點。
Electrochemiluminescence ( ecl ) is a technique that combines chemiluminescence ( cl ) and electrochemistry ( ec ). the cl reaction was initiated by an electrochemical reaction at electrode surface. such an electro - initiation reaction introduces a large number of additional advantages, such as high sensitivity and selectivity, rapid and convenient operation and relatively simple instrumentation system
它將電化學技術與化學發光檢測結合起來,彌補了電化學方法和化學發光方法的不足,具有靈
敏度高、選擇性好、動力學范圍
寬、檢測快速方便、儀器價格便宜等優點,近幾年來在分析化學,尤其在生物分析領域引起了人們的極大關注。
Meanwhile, the successful application in eplrs validates the effectiveness and justification of the scheme and its support to the high data - rate real - time services. it provides one choice for multi - hop wireless network to support the bandwidth and delay sensitive services
同時, eplrs通信網路的應用實例也驗證了本方案的有效性、合理性及其對多跳無線網路高速實時業務的支持,為多跳無線網路支持帶
寬時延
敏感業務提供了一種選擇方案。
Zno film is a novel - direct compound semiconductor with wide band gap energy of 3. 37ev and a exciton binding energy 60mev at room temperature. due to its the prerequisite for visible or ultraviolet light emission at room temperature, it has the tremendous potential applications for ultraviolet detectors, leds, lds. zno thin film is used widely and effectively in the fields of surface acoustic wave devices, solar cell, gas sensors, varistors and so on because of its excellent piezoelectrical performance
室溫下禁帶
寬度為3 . 37ev ,激子束縛能為60mev ,具備了室溫下發射紫外光的必要條件,在紫外探測器、 led 、 ld等領域有著巨大的發展潛力; zno薄膜以其優良的壓電性能、透明導電性能等使其在太陽能電池、壓電器件、表面聲波器件、氣
敏元件等諸多領域得到廣泛應用。
In this thesis, wide - fov ( field - of - view ) optical systems with optical gain based on fov and optical gain of laser detection and warning optical system are studied. it can solve the problem of wide fov matching with small photosensitive surface, enhance the power received, increase detecting sensitivity, reduce the power of laser and decrease the cost of laser accordingly
本文正是針對上述問題,從激光輻射探測光學系統的視場和光學增益出發,研究
寬視場有增益光學系統,解決大視場和小光
敏面匹配的矛盾,增強接收到的光功率,提高探測靈
敏度,降低對激光輻射源功率的要求,從而降低相應激光器的成本。
The result of our experiment indicated the novel biosensors exhibite excellent electrochemical characteristics to glucose with substantial improvement in sensitivity, low detection limit, stability and anti - interferer
實驗證明,引入了新的電子媒介體后,該傳感器的靈敏度顯著提高,線性范圍顯著加寬,能有效的消除抗壞血酸和尿酸等的干擾。