高频率

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因为一个新站，搜索引擎一般是不会知道你的，提交完，然后就是接着更新文章，把自己的网站地址发到一些更新频率比较高的地方，这样搜索引擎才有可能爬到你的站上，而且对google的收录也非常有帮助，烟台seo站一天就被google收录得益于我在站长网写了一篇软文，站长网的更新频率很高，我发布的软文差不多两个小时吧就可以在搜索引擎中找到了，同时这也算是个外链吧，google搜索引擎很喜欢外链，假如你能在短期内搞到个高质量的外链，然后再提交下的话，一般google很快就能收录你的站了。

Objective To study the power spectrum density of blood flow ultrasonic Doppler signal using wavelet analysis. Method Doppler signal of blood flow in human common carotid artery was studied with wavelet scalogram analysis, an affine smoothing Wigner Ville transform with a constant "Q" character. Result Wavelet scalogram of blood flow ultrasonic signal had a higher distinguishability than STFT spectrogram in the low frequency portion, but had poorer decussation terms than spectrogram.

对于平稳信号的处理工具仍然是Fourier变换，但是，在实际应用中的绝大多数信号是非平稳的，现在看来处理非平稳信号的主要工具将是小波变换，这主要是因为传统的Fourier变换分析信号时，时间和频率分辨率精度是固定不变的，而利用小波变换分析信号，在信号高频段时间分辨率精度也较高，在信号低频段频率分辨率精度较高，这很符合非平稳信号的特点。

Use of Chinese young learners is in the medium range;(2) among the six strategy categories metacognitive strategies are the most frequently used whereas compensation strategies are theleast frequently used;(3) there exists statistically significant difference between female and male young learners in language learning strategy use; and (4) there is a positive correlation between young learners' language learning strategy use and their language proficiency.

其中，元认知策略的使用频率最高，补偿策略的使用频率最低；(2)男、女生在学习策略的使用上存在显著差异，无论是在总体上还是六种策略的使用上，女生都比男生的使用频率高；(3)成功的英语学习者学习策略的使用频率最高，其次是水平一般的学习者，不成功的学习者学习策略的使用频率最低。

However, please be noted that high sensitivity will allow the interfusion with exterior noise irrelevant to the quantity to be measured, which will be also amplified by the system.

传感器的频率响应高，可测的信号频率范围就宽，而由于受到结构特性的影响，机械系统的惯性较大，因有频率低的传感器可测信号的频率较低。

In series capacitance,the low frequency is load resonance frequency.In parallel capacitance,the high frequency is load resonance frequency.

在串联电容时，负载谐振频率是两个频率中的较低的那个频率，而在并联电容时，负载谐振频率则是其中较高的那个频率。

The minimum fluidization velocity has a minimum value when the frequency of sound waves is 120Hz and it will decrease as the sound pressure level increases. The degree of sound attenuation will increase while bed material is higher and the fluidization quality of fine particles will become poor and the minimum fluidization velocity will increase. Compared with TiO2, the SiO2 fine particles have a better quality of fluidization at the same fluidized conditions.The cluster/subcluster model and oscillators model are used to describe the fluidization characteristics of fine particles in a sound-assisted fluidized bed. The theoretical calculations show that the minimum fluidization velocity umf is decreased with the SPL increased at the same frequency of sound and the quality of fluidization is better.

论文还系统的考察了声压和频率对纳米SiO2和TiO2颗粒流化特性的影响，结果表明：在频率一定的情况下，声压越高，流化床中形成的聚团尺寸越小，最小流化速度越低，流化质量越好；当声压低于120dB时，声场对超细颗粒流化特性的影响减小，当声压大于130dB时，则能显著改善流化效果，使流化床内的颗粒聚团明显减小，最小流化速度明显降低，粉体带出减小；声压一定，频率为120Hz左右时，最小流化速度最低，此时流化床中形成的聚团尺寸最小，流化效果最好；超细颗粒达到较好的流化状态存在一个最佳频率范围，随着声压增高，这个频率范围将增大。

Due to existing signal processing technology's shortage such aslow measurement, narrow measurement range precision and other poor performance, we introduced a high-precise signal processing technology:firstly,to get power spectrum with Hanning windowed Welch modified periodogram, search its peak value frequency;secondly, to apply zooming analysis via Goertzel algorithm;at last,to get a highly precise doppler frequency with energy centrobaric rectifying algorithm.

针对存在的缺点，本文提出了一种应用于激光多普勒测速的高精度信号处理技术，即首先利用加Hanning窗的Welch修正周期图算法得到信号功率谱，搜索其谱峰值频率，接着利用Goertzel频谱细化算法对搜索的谱峰进行细化分析，再引入能量重心频谱校正算法对细化后的谱峰进行校正分析，从而将离散频谱分析算法、频谱细化算法和频谱校正算法三者有机结合起来，充分发挥各自的优点：通过加Hanning窗的Welch修正周期图算法快速得到功率谱及峰值频率，通过Goertzel算法获得分析频带的高分辨率频谱，然后通过能量重心校正算法对细化后的频谱进行高精度校正，这样不仅保证了算法的高效性，而且大大提高了分析的精度。

According to the consentaneous diagnostic criteria, divided the disease into Zheng patterns of TCM. Results 1 Female was predominated in IBS, compared with male. With the increase of age , the prevalence rate of IBS did not rise. The higher educational degree community had a higher morbidity of IBS than the community of the lower educational degree. Abdominal pain and discomfort are the symptoms, which more happened. Male and female did not show the distinction on the common symptoms.

结果 1IBS 女性患病率高于男性；患病率无明显年龄差异趋势；较高文化程度群体患病率高于较低文化程度的群体；腹痛及腹部不适是患者发生频率较高的症状；男性与女性在常见症状的发生频率上差异无显著性，但精神心理症状的发生频率上，女性应激事件发生率及抑郁状态发生率高于男性；肠道感染史、受凉、生冷饮食、辛辣饮食均为可能导致IBS发病的较危险因素；肠外症状中较常出现的为头痛、腰背痛、疲乏及功能性消化不良。

Adjust the pressure of the impact system steplessly, the strike energy of the hammer will also shift steplessly. When the pressure is higher, the strike energy is higher. When the pressure is lower, the strike energy is lower. Adjust the oil flow of supply pump steplessly, the strike frequency will also shift steplessly. When the flow is more, the strike frequency is higher. When the flow is less, the strike frequency is lower.

从而可通过无级调节控制冲击系统的压力，无级调节控制冲击器的冲击能，压力高时冲击能大，压力低时冲击能小；通过无级调节控制油泵供给冲击系统的流量，无级调节控制冲击器的冲击频率，流量大时冲击频率高，流量小时冲击频率低。

Pitch frequency by the sound level of the object decision, high frequency sound on the high, low frequency sound is low, the existing international standard pitch was in May 1939 in London by the International Standards Association of a1 = 440 Hz.

音高是由发音物体振动频率的高低决定的，频率高声音就高，频率低声音就低，现行的国际标准音高为1939年5月国际标准协会在伦敦通过的a1＝440赫兹。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！