高频率

The result show the resolution of temperature measured by dither frequency is very high.

由于测量抖动频率的精度较高，故由抖动频率测量温度具有很高的分辨率。

Therefore the dispersion curves obtained in the field are primarily consisted of the first mode. For a heterogeneous elastic solid consisting of three homogeneous layers whose interlayer has low velocity, the phase velocity V〓 of the first mode will also close up to the Rayleigh wave velocity of the bottom layer when frequency f→OHz, but V〓 of the first mode will close up to the shear wave velocity of the interlayer when f→∞, and there is a cut-off frequency at high frequency region for the first mode and V〓 close up to the compressional velocity of interlayer when interlayer is liquid.

当三层固体介质中存在软夹层时，若f→OHz，则其基阶模式的相速度V〓→V〓（V〓为最底层介质的瑞利波速度）；若f→∞，其基阶模式V〓→V〓（V〓为中间层介质的横波速度）；若三层介质中存在液体夹层，当f→OHz时，基阶模式V〓→V〓，而基阶模式在高频段存在一个截止频率，截止频率处的瑞利波速度V〓→V〓；由此可判定，野外实测的相速度频散曲线不仅有基阶导波模式，同时还应有高阶导波模式波的存在，接收信号中存在模式间的跳跃，因此频散曲线会产生"之"字形现象。

Based on the results, suggestions are provided to assist engineers in this field to select best parameters for saving test time of flash memories.

就NOR型的快闪记忆体测试来说，本研究发现，在相同测试条件下，随著IC电源电压升高可以减少测试时间，因为电压越高则写入与擦拭的动作会越快完成，且测试项目中最为费时的就是写入时间；提高测试频率也可以减少测试时间，因为较高的频率加快测试指令下达的速度与资料传输的时间，对於减少读取与写入的时间有极大的帮助。

Results: Primary glaucoma invasive age from 60-70 was crest-time, it was 41.60% of sum; female patients were majority, it was 62.18% of sum; spring is high incidence time, it was 36.13% of sum; primary glaucoma was chronic disease, averaged course was two years-two months; usual symptom are hyperpyrexia of liver (34.03%), stagnation of QI due to depression of the liver (17.23%), hepatic and renal yin deficiency (13.45%), asthenic yin causing excessive pyrexia (11.76%), upward invading of wind-fire disturbing eye (11.76%), asthenic yin causing predominant yang (9.24%); inpairment of vision, eyes pain, shallow of anterior chamber were usual complaint and physical sign; using frequency usual prescription from hing to low were: hoelen, isapgol, anemarrhenae, glycyrrhiza uralensis, alisma rhizoma, cortex moutan, etc.

结果：原发性青光眼发病年龄以60~70岁最多见，占总例数41.60%；性别中女性患者居多，占62.18%；发病时间以春季最多，占总病例数36.13%；本病以慢性发病为主，病程平均为2年2个月；常见证候为肝火上炎证(34.03%)、肝郁气滞证(17.23%)、肝肾阴虚证(13.45%)、阴虚火旺证(11.76%)、风火上扰证(11.76%)、阴虚阳亢证(9.24%)；视力下降、旅胀痛、前房浅等较为常见的症状与体征；常用方使用频率由高到低依次为绿风羚羊饮、六味地黄汤、逍遥散等；常用药物使用频率由高到低依次为：茯苓、车前子、知母、甘草、泽泻、丹皮等。

Also, the aborigines suffering from general chronic diseases (diabetes, hypertension, and hyper lipemia) tend to make more frequent clinic visits than the Han people do.

在一般慢性病（糖尿病、高血压、高血脂）之就医频率上，原住民显著高於汉民族；而就医频率偏高的主要原因之一乃为疾病控制不好，需有较频繁的门诊医疗照护。

Based on a profound study of the variation law of phase difference between two periodic signals and the ordinary frequency measurement method, this paper presents a new method for comparing frequency standards, which is based on the Lissajous figure.

用传统的李沙育图形法是不能完成对高精度频标比对的，但将等效鉴相频率这一新概念引进，可以使得本来不能完成的高精度频率标准的比对变为可能。

In order to improve the frequency resolution, realize high precision frequency estimation, this thesis proposes the high resolution polynomial Wigner-Ville distribution using Chirp-Z transform, the validity of this algorithm is verified using synthesized data.

为了提高基于FFT的谱分析算法的分辨率，实现高精度的频率估计，提出了利用Chirp-Z变换的频率高分辨多项式Wigner-ville分布，并用合成的仿真数据，验证了上述算法的有效性和正确性。

A novel quasi-constant frequency hysteresis PWM control approach is presented in this paper. Frequency feedback is introduced in hysteresis current control to stabilize switching frequency. Comparing with the common used constant frequency current mode control, the new approach has better stability, faster transient and higher precision, as well as elimination of sub-harmonic oscillation.

摘 要：本文提出了一种新的准固定频率滞环PWM电流控制方法，该方法在滞环电流控制的基础上，引入频率反馈控制，使开关频率基本固定，解决了目前广泛使用的固定频率电流控制方法具有的次谐波振荡的问题，并且具有稳定性好、相应速度快、控制精度高的优点。

The end linking the timing gears cap, the side wall of cylinder and the skirt section of the engineblock are the sound radiation resources of the two engineblock sides. Except that, this thesis calculates sound power level of radiated noise from the engineblock with MATV method. It is found that the noise radiated from the engineblock is slightly loud.

此外本文还应用MATV法计算了气缸体辐射噪声的声功率级，通过声功率级的计算发现：气缸体的辐射噪声偏高，达到了108.84dBA，并且在850Hz时，由于气缸体的激励频率与其第八阶固有频率相等，气缸体发生了共振，因而在该频率时，气缸体的辐射噪声最大，所占气缸体表面辐射噪声总能量比重也最高，该频率应该是本文噪声控制关心的重点。

Numerical simulations and analytical results show: in longitudinal and oblique seas, ship may be subjected to primary parametric resonance with large roll amplitude and even capsizing, when encounter frequency is near the twice of roll natural frequency, wave length and ship length are of the same order and the wave height is larger than a certain value; in oblique seas, ship roll motion is a forcedly-parametrically excited oscillation, primary resonance occur as the encounter frequency is near the roll natural frequency, which may lead to large rolling and capsizing too.

数值仿真和解析分析结果表明：在纵浪和斜浪中，当遭遇频率接近船舶横摇固有频率的两倍，波长和船长接近，波高超过某一阈值的时候，船舶会发生主参数共振，产生大幅横摇甚至倾覆；在斜浪中，船舶发生的是参强激励横摇运动，遭遇频率接近横摇固有频率时，还会激起横摇主共振，同样会产生大幅横摇甚至倾覆。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。