In digital relay, the percentage of noise will increase rapidly with the increase of sampling rate when derivation calculus is substituted by sampled difference term. to solve this problem, a new method using fragment function integrated with the least square algorithm is proposed in this paper. the influence of white noise is greatly reduced and the accuracy of the dead angle calculation is nicely improved after adopting the new method
在數字式保護中，如果用差分代替求導將導致
噪聲的百分比誤差隨著采樣頻率的提高而劇增，本文對此進行了分析並提出了用分段樣條函數最小二乘法來計算電流波形的導數值，以便在提高采樣率的同時降
低噪聲誤差的影響，並將其應用於基於32位浮點dsp的新型變壓器保護裝置。
Adopting rubber wheel structure for rotating parts, low noise and no dead point the rotating speed is 80 - 140rpm
轉燈傳動部分採用國際先進的橡皮靠輪結構，
低噪音，無死點。轉燈部件轉速為80 - 140次/分鐘。
2high grade of dry batteries and good integrated circuit blocks are employed
3結構獨特，散熱性能好，
低噪音。
Furthermore, it is also verified by chassis dyno tests that lpg motorcycle has better emission performance than gasoline engine, and has better acceleration performance e. g. exceed acceleration than former gasoline engine, and has low noise level characteristics as well as has ability to achieve equivalent level fuel economy performance compared with former gasoline engine
整車動力性、經濟性和排放性轉鼓臺架試驗對比表明： lpg摩托車整體排放性能優于汽油摩托車；最高車速略有下降但加速性基本與汽油摩托車相同（超越加速性優于汽油摩托車） ； lpg摩托車具有良好的
低噪聲特性，且整車燃料消耗率及其經濟性與原機基本相當。
In the forth chapter the series negative feedback and interstage mismatching are presentation, and a low noise amplifier whose operating frequency is 1. 5ghz 1. 8ghz is developed
第四章詳細介紹了源極串聯負反饋和級間失配法，並設計和製作了1 . 5ghz 1 . 8ghz
低噪聲放大器。
5. lessen libration, debase noises, avoid pollution, improve working condition
5能使機械減少振動降
低噪音防止污染，改善勞動條件。
The features of metal screw gear is reducing noise and libration. what is noticeable is : the equivalent plastic straight gear may effectively reduce the noise and libration
金屬螺旋輪通常特點是能降
低噪聲和振動值得注意的是，等效的塑料直輪可以更有效地降
低噪聲和振動。
High output level, low noise and low non - linear distortion
輸出電平高，
低噪音和較小的非線形失真。
Uses philips modules and high quality, sensible pin photo - diode, provides high rf output, low noise and low non - linear distortion
採用飛利浦光電模塊和優質量高靈敏度pin光電二極體，輸出電平高，
低噪音和較小的非線性
The in - depth analysis of the noise in gilbert mixer including parasitical capacitors, in which the mixer and lna have been connected together and the noise figure of mixer can be expressed explicitly as that of lna
回在包括寄生電容的情況下，對雙差分對混頻器（ gilbertmixer ）的
噪聲性能做了深入分析，把混頻器和
低噪放聯系在一起，可像
低噪放一樣，直觀的表達混頻器的
噪聲系數。
Aiming at the stock market data ( smd ) increasing infinitely, being short, noised seriously, three algorithms are presented to pretreat smd. they do n ' t reduce the useful information but also eliminate the noise ; 2
基於股市數據無限增長及我國股市數據的時間序列不長、
噪聲水平較高，提出三種股市數據預處理演算法，在降
低噪聲水平的同時又不損失長程相關的有用信息； 2
Low noise amplifier ( lna ) is widely used in front end of a received set of mobile communication 、 wireless radio 、 blueteech technology and so on 。 the active device is the core of the circuit and has significant effects on the whole equipment, therefore, the design of the active device is vital in lna
微波
低噪聲放大器（ lna ）廣泛應用於移動通訊、無線電、藍牙技術等的rf前端。 lna中的有源器件是整個電路的核心，對整個放大器電路的性能有著重要的影響，因此有源器件的設計是lna的關鍵技術之一。
Based on adoption of worldwide advanced parts and components of heavy duty trucks, steyr series heavy duty truck featuring modularization, seriation, strong power, high reliability, low fuel consumption, low noise and low emission, is the only vehicle whose manufacturing technology was introduced and put on market in series
斯太爾系列重型車，採用世界真正重型汽車零部件總成，具有模塊化、系列化、優勢動力強勁的優勢，可靠性高，
低燃油消耗，
低噪音、
低排放，是國內唯一全面引進並批量投放市場的系列化主要汽車。
For designing railway vehicle with lower noise, interior noise is measured in the cushioned berth sleeping car
為了設計
低噪聲鐵道車輛，對我國既有線上的軟席臥車（空調）進行了車內
噪聲測試。
Chapter 5 is about the design of millimeter wave solid circuit included frequency multiplier, low noise amplifier, medium power amplifier, mixer, if amplifier lastly, based on the work above, a millimeter wave t / r module is developed and the analysis of the result is also introduced
第五章毫米波固態電路，詳細分析了毫米波倍頻器、
低噪聲放大器、毫米波放大器、混頻器的理論，製作了毫米波混頻器、毫米波放大器、中頻放大器、倍頻器等有源電路。最後，在上述基礎上製作了毫米波t / r組件。
It is important to connect the transducer and amplifier by a low-capacitance, low-noise, coaxied cable.
傳感器和放大器之間的聯結採用
低容抗，
低噪音的同軸電纜是很重要的。
" zoom " suggests a low engine noise ; " whiz " suggests a high whistling sound.
「zm」指發動機的低噪音，「whiz」指似口哨或汽笛的高聲。
