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- Reverberation room is the special test room that is used in acoustics, in the measurement of sound absorption coefficient in random incidence and determination of sound power levels of noise sources, the reverberation room is used very extensively. 摘要混響室是聲學(xué)專(zhuān)業(yè)的實(shí)驗室用房，它在測量聲波無(wú)規入射時(shí)材料的吸聲系數和測量噪聲源的聲功率級中得到了廣泛應用。
- Method of sound power levels of noise emitted by household sewing machine head 家用縫紉機機頭噪聲聲功率級的測試方法
- Engineering method for the determination of sound power levels of noise sources using sound intensity 根據聲音強度測定噪聲源聲功率級的工程方法
- Engineering methods for the determination of sound power levels of noise sources in a special reverberation test room 在混響室里用工程方法測定噪聲源聲功率級
- Acoustics - Determination of sound power levels of noise sources - Guidelines for the use of basic standards 聲學(xué)。噪聲源的聲級測定?；A標準使用導則
- Determination of sound power levels of noise emitted by metal cutting machine tools 金屬切削機床噪聲聲功率級的測定
- Precision methods for the determination of sound power levels of noise sources in anechoic and hemi-anechoic rooms 在無(wú)回聲和半無(wú)回聲的室內測定噪聲源聲功率級
- Engineering Methods for the Determination of Sound Power Levels of Noise Sources for Essentially Free-Field Conditions over a Reflecting Plane 反射平面上實(shí)質(zhì)自由場(chǎng)條件下噪聲源的聲功率級的工程測定法
- Acoustics - Determination of sound power levels of noise sources using sound intensity - Precision method for measurement by scanning 聲學(xué)。利用聲強度對噪聲源聲功率級別的測定。使用掃描精確測量法
- The level of noise in Anqing Textile Factory exceeded the Criteria of National Occupational Hygiene 85dB(A). 安慶市紡織廠(chǎng)女工的職業(yè)噪聲暴露平均水平超出國家職業(yè)衛生標準85dB(A)。
- Measure the level of noise with the SafeZone indicator, calculate its 22-day EMA, and translate that into dollars. 使用安全區域指標度量波動(dòng)水平，計算出其22日均線(xiàn)，并將結果化為金額。
- One coal mine gas plant with an electrical power level of 1.35 MW avoids approximately 45,000 tonnes of CO2 emissions each year. 一臺發(fā)電功率為1.;35兆瓦的礦井瓦斯設備每年能減少約45;000噸CO2的排放。
- She made a lot of noise about the poor food. 她高聲抱怨食物太差。
- The transformer is designed for a power level of 350 kW and is realized with amorphous core material and coaxialwindings . 該變壓器是按350kW的功率級設計的,并且用無(wú)定形鐵心材料和同軸繞組制成。
- The rising level of crime is a sign of the times. 犯罪率增高是這一時(shí)代的特徵。
- The dentist's drill made a lot of noise. 牙鉆發(fā)出很大的噪音。
- This article provide two programs which can get the second negative output from the power level of a main low-dropout regulator. 本文給出了兩種從一個(gè)主降壓穩壓器的功率級得出一個(gè)第二負輸出的方案,這兩種方案具有廣泛的實(shí)用價(jià)值。
- The topology satisfies the requirement of galvanic isolation and greatly increases the power level of single-stage PFC converter. 該變換器能滿(mǎn)足電氣隔離的應用要求，提升單級隔離型PFC的功率等級。
- The level of inflation has gone beyond 8%. 通貨膨脹率已經(jīng)超過(guò)了8%。
- Such an ensemble average can reduce the level of the instabilities originating from individual pulsar and other sources of noise. 采用合適的長(cháng)期穩定度算法，由多顆毫秒脈沖星計時(shí)觀(guān)測可以建立綜合脈沖星時(shí)間尺度。
