频谱线

The speed also affects combustion noise through variation of advance angle.

推迟供油提前角可以显著降低噪声。2、燃烧系统多参数分析2.1、喷孔数目在喷油压力不变时，减少喷油孔数量，可使促进燃油雾化，使着火延迟期缩短，因而有助于降低压力升高比，汽缸压力频谱线也相应降低，尤其是中、高频成分降的更多些。

One of the most common ways to describe a wood's tonal properties is in terms of its frequency range,which is often broken down into low-end frequencies,mid-range and high-end frequencies.picture it as a visual spectrum,as we've done in the chart to the right,with the lower frequencies on the left and the higher frequen-cies on the right.the graph line for each wood visually depicts its general tonal range.rosewood and ovang kol,for example,tend to resonate with more low-end frequencies,whereas koa,cocobolo and maple tend to sound brighter from having more top-end frequencies.note also rosewood's"scooped"midrange and ovang-kol's fuller midrange.the doted lines for walnut and koa denote the expansion of low-end frequency range as the guitar opens up after a period of playing it.

最常见的方式描述了木材的声音特性是在其频率范围内，这往往是细分为低端频率，中端和高端frequencies.picture它作为一个视觉频谱，因为我们'维生素E这样做的图表，以权，以较低的频率在左边和更高的频率，种上right.the图线的每一个木材视觉描绘的一般音调range.rosewood和ovang科尔举例来说，往往会产生共鸣更多的低端频率，而兴亚， cocobolo和枫树往往从健全光明有更多的高端frequencies.note也花梨木的"收购"的中端和ovang -科尔的充分midrange.the doted线的核桃和兴亚指扩大低端频率范围内的吉他开辟了一段时间后，打它。

The above formulas are used in theM standard spectrum and the three-section standard spectrum for evaluating the tread patterns' noise to provide a simple calculating tool and line-up comparison for analyzing the frequency spectrum of tread patterns' noise .

将三者之间的变换关系应用到轮胎花纹噪声评价M标准线和三段标准谱线中，为轮胎花纹噪声的频谱分析提供了简化运算工具和排队比较方法。

This spectrum line is the frequency signal of real test.

该频谱线是理论测试的频率信号。

The spectrum analysis of the air-ultrasonic waveform indicates that when the matcher thickness is calculated at the highest spectrum and the subsequent higher spectrum of the pulse waveform, it can obtain a better result. But all the highest spectrum of the air-ultrasonic waveform moves to the high frequency zone in the experiment, which is a possible important reason that the testing extent of the air-ultrasonic transducer is limited.

经对空气超声波形进行频谱分析后发现用脉冲波形的最高谱线及次高潜线对应的频率计算匹配层厚度，可得到较好的匹配结果，但是空气超声波形的最高谱线均移向高频段，这可能是造成脉冲空气超声换能器可检测的范围有限的一个重要原因。

The frequency spectrum is composed by not the continual spectral line,each spectral line represents a harmonic component.

频谱是由不连续的谱线组成，每条谱线代表一个谐波分量。

Results Compared with the normal group,in the extratracheal group the ratio of actual value of resistance to the predict from 20 Hz to 35 Hz increased obviously and this only occurred with the reactance at 20 Hz (P＜0.01). The resistance curve showed clear rise after the 20 Hz and the reactance curve peaked at 20 Hz and was leveled to normal at 35 Hz.

结果 肿物组20赫兹时阻力和电抗（R20、X20）、35 Hz时阻力（R35）的实测值占预计值%显著高于健康组（P＜0.01）；频谱图中肿物组阻力线于20 Hz后显著升高，电抗线于20 Hz附近达到最高，并于35 Hz趋向正常。

One of the most common ways to describe a wood's tonal properties is in terms of its frequency range,which is often broken down into low-end frequencies,mid-range and high-end frequencies.picture it as a visual spectrum,as we've done in the chart to the right,with the lower frequencies on the left and the higher frequen-cies on the right.the graph line for each wood visually depicts its general tonal range.rosewood and ovang kol,for example,tend to resonate with more low-end frequencies,whereas koa,cocobolo and maple tend to sound brighter from having more top-end frequencies.note also rosewood's"scooped"midrange and ovang-kol's fuller midrange.the doted lines for walnut and koa denote the expansion of low-end frequency range as the guitar opens up after a period of playing it.

最常见的方式描述了木材的声音特性是在其频率范围内，这往往是细分为低端频率，中端和高端frequencies.picture它作为一个视觉频谱，因为我们'维生素E这样做的图表，以权，以较低的频率在左边和更高的频率，种上right.the图线的每一个木材视觉描绘的一般音调range.rosewood和ovang科尔举例来说，往往会产生共鸣更多的低端频率，而兴亚， cocobolo和枫树往往从健全光明有更多的高端frequencies.note也花梨木的&收购&的中端和ovang -科尔的充分midrange.the doted线的核桃和兴亚指扩大低端频率范围内的吉他开辟了一段时间后，打它。

The growth relationship between spectrum parameter and fetch were studied, from which three parameters and overshot phenomenon that appears during wind wave spectra developing were tested, and an equation describing the growth of three-parameter spectra with wind wave was obtained With the equation, the spectra of wind waves were obtained at zero-dimensional fetches of 300, 500, 2000, 5500, 10000, and 15000, and the overshot was described more clearly. However, the overshot does not exist in the whole process of wind wave spectrum development as stated previously by Hasselmann, but in the early stage of the development only, extenuates with wave growth and then disappears when the wave fully grows.

基于已得到的谱参量随风区的变化关系，对三参量风浪频谱以及风浪频谱成长过程中存在的&超射&现象作深入的研究，得到三参量风浪频谱随风区的成长关系：在此基础上，得到无因次风区：300、500、2000、5500、10000、15000下，风浪频谱的谱线，从而直观地描述了风浪频谱成长过程中的&超射&现象，并认为在风浪频谱的成长过程中确实存在着&超射&现象，但是该现象并不如Hasselmann等提出的理论中阐述的那样存在于风浪频谱成长的全过程，而是仅存在于风浪频谱成长的初期。

BPSK signal modulated by spread2spect rum sequence can be made by using SAW tap delay line.

在 扩展频谱通信系统中，常用 SAW 抽头延迟线来实现扩频序列的捕捉，利用 SAW 抽头延迟线可以生成被扩频序列调制的中频 BPSK 信号。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。