频率

The feeding regimes, including optimum feeding frequency, diel feeding rhythm, and optimum feeding rate, were established for gibel carp . The optimum feeding frequency for gibel carp was determined through 8week growth trial at five frequencies (2, 3, 4, 12 and 24 meals/d). Diel feeding rhythm of gibel carp was investigated by 24-hour trials at two body sizes (mean body weight: 20.5g and 76. 3g). The optimum feeding rate for gibel carp was estimated by the bioenergetics modelling and the validation trial was carried out based on the the feeding regimes of gibel carp.

异育银鲫的最佳投喂频率是通过设计5组不同的频率2、3、4、12及24次//天，经8周生长实验，然后比较鱼体生长和饲料转化效率获得的；异育银鲫的日摄食节律是通过对两组不同体重异育银鲫（平均体重20.5g和76.3g）24h内摄食率的测定而获得的；异育银鲫的最适摄食率是通过鱼类生物能量学模型的建立而获得的；最后通过生长实验对建立起来的异育银鲫投喂体系进行了验证。

In the former stage, Based on the concept that both glottal excitation and vocal tract parameters are time varying in amplitude and frequency, we detect pitch with frequency domain transform

在波形合成阶段，以基音频率轨迹为依据，将混叠语音信号分割为独立的短时周期信号，利用数字多谐振荡器的选频特性，获取相应的各次谐波的频率、幅度以及相位信息，利用这些参数在频域叠加来合成

This model considers more factors, especially great and complex effect of geological factors on grouting spread, Value of fissure aperture is cleared and defined, all kinds of parameters of geology and grouts property in connection with model can be tested accurately, therefore this approach practice more and have more practical value comparing with other grouting model to provide solid theoretical basis for grouting controlling method.

在频率水力隙宽和宾汉流体的渗流规律的研究成果基础上，考虑地下水影响半径、频率水力隙宽、粘度时变性、裂隙的倾角和方位角、流核等诸多影响因素，建立了牛顿流体和宾汉流体的注浆扩散模型，并对数学模型实现了计算机模拟，便于工程实际中的应用。

They were all G/A heterozygous at RHD 1227 site.

RHD 1227A等位基因在Rh阴性人群中的频率为16.43％，在随机人群中的频率为0.72％。

In a homodyne unit, we take advantage of the Gunn oscillators' instabilityby varying the DC supply to "push" the frequency slightly.

在简单型耿儿单元，我们利用耿氏二极管振荡器的频率不稳定的优点，通过改变直流电源把频率拉偏一点儿。

The history of hypertension、 diabetes、 hyperlipoidemia and smoking in ICVD group are all higher than control groupP

ICVD组和对照组的CC+GC基因型频率分别为0.167和0.051，C等位基因频率分别为0.113和0.031。

So the given information about time domain can be made use and it will form information accumulation effect to suppress interference frequency and weaken impact noise effectively without incensement in calculation.

从特征识别角度分析了现有频率估计方法的信号分解结构的特点，并提出了一种分频域分解结构，将对应不同时间的多个单频信号融合构成一个组合信号，以利用时域已知信息并形成信息积累作用，能有效抑制干扰频率和削弱冲击噪声且计算量增加较少。

The thesis advances a new optimality design method which can consider stress and proper frequency restriction condition synthetically, through basing on stress optimality criteria methods, owing to optimality criteria don't relate to multi-constraint and apply incomprehensively.

本文针对优化准则法不能考虑多种优化约束条件、通用性差的缺点，基于应力优化准则法和固有频率优化准则法，提出了一种可以综合考虑设计模型的应力约束条件和固有频率约束条件的优化设计方法。

In the incontinuous cutting, the wave shape of milling can be looked as periodic function. When the milling wave shape with single-tooth was looked as impulse function, by the Fourier Transform, we can find out that it is composed of sine wave with a given frequency and a series of integer multiple frequency. Discussing on the power function is a major tache for studying on the cutting capability of the complex three-dimension groove milling inserts, so to know the facts that affect the single-tooth milling spectral value, and to observe the dynamic milling wave property from the composition of the power spectral, thus we can design and optimize grooves.

在断续切削中，铣削波形可被看作周期函数，将单齿铣削波形看成为脉冲函数，经过傅立叶变换，可以表示为一个按特定的基本频率变动的正弦波形的分量和许多个按基本频率的整数倍而变动的正弦波形的分量叠加而成，讨论所获得的频谱函数，是研究三维复杂槽型铣刀片切削性能的主要环节，以便了解影响单齿铣削波形幅值谱图的各种因素，并从功率谱图的组成情况来考察动态铣削波形的特性，从而进行槽型的设计和优选。

As a further studying, the "beat" oscillation phenomenon appearing beforce the chatter occurs is analyzed and it is found that there is a self-excited vibration frequency f during the rilling. Farthermore, if the frequency f is infinitively close to one of the natural frequencies of the rolling mill system then an instability will occur.

作为颤振振因的深化研究，对颤振出现前的&拍振&现象进行了分析，推证了轧制过程中有一个自激频率f存在，而且当它与轧机系统的某个固有频率无限接近时会立即引起轧机工作的不稳定。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐