频率

Altera Corporation system to the Cyclone FPGA series of digital platform, microprocessor, bus, Digital Frequency Synthesizer, memory and I / O interface hardware concentrated in an FPGA, the use of direct digital frequency synthesis technology and digital modulation waveforms required to achieve the rise, Using FPGA ROM storage of the DDS waveform table, and make full use of on-chip resources, improve the system's accuracy, stability and robustness.

系统以 ALTERA公司的 Cyclone 系列 FPGA 为数字平台，将微处理器、总线、数字频率合成器、存储器和 I/O 接口等硬件设备集中在一片 FPGA 上，利用直接数字频率合成技术、数字调制技术实现所要求波形的产生，用 FPGA 中的 ROM 储存 DDS 所需的波形表，充分利用片上资源，提高了系统的精确度、稳定性和抗干扰性能。

It is known from the experimental outcome that the sound frequency in attached area with defect is high and with completeness is low; the intensity in attached area with defect is weak and with completeness is strong.

经实验结果可得知瓷砖黏贴缺陷处之声音频率较高，而黏贴完整处之声音频率较低；瓷砖黏贴缺陷处之黏著强度较小，而黏贴完整处之黏著强度较大。

The theoretical study shows that the central frequency is linear with the square of the voltage applied on the Wheatstone bridge. The adjustable frequency range can be extended by decreasing the wide of the bridge and the resistance of the Wheatstone bridge.

理论研究表明：中心频率与电桥电压的平方成线性关系；中心频率的可调节范围可通过减小梁的宽度和压敏电桥的电阻来扩展。

Artificial neural network classifiers are respec-tively built by wingbeat waveformti me series and wingbeat frequencies.

研究中分别以蚊虫翅振频率和翅振波形建立人工神经网络，结果发现以翅振频率为特征值的神经网络的识别准确率高。

The correlation theory is proposed to calculate phase difference and designed in frequency tracking. A promoted method for the initial measurement of CMF's signal processing is based on the Chirp Z Transform application. The result of simulation has proved that the techniques above are feasible.

应用DFT方法处理科氏流量计的信号是DSP算法的基础，本文除了详细介绍其实现过程，还提出了利用相关函数计算相位差和解决频率跟踪算法中的关键技术以及利用线性调频Z变换实现频率初始化测量的新技术。

The effects of reaction temperature,reaction time,ultrasound frequency,agitating velocity and HCl amount on the yield and purity of abietic acid were investigated by orthogonal experiment.

通过正交优化实验考察了反应温度、反应时间、超声波频率、搅拌转速、盐酸用量对枞酸单离收率和纯度的影响，确定最佳异构化反应条件为：超声频率47.2 kHz，反应温度55℃，盐酸用量0.06 mL盐酸。

Many areassured that the frequency potential of processors generation k10 will be opened with the aid of 65 nm technology, although the preliminary data say that the defaultfrequencies offour core processors agena FX will not exceed 2.9 GHz.

很多人都担心潜在的频率处理机一代k10将开放与援助的65纳米技术，虽然初步数据说默认频率四个核心处理器agenafx将不超过2.9千兆赫。

Associates from site fudzilla already attempted to prove the reliabilityofscreen shotwithenergy efficientversion agena FX with 1.9 GHzfrequency and default voltage1.276 v, but also about the possibility tooverclock such four core processors to frequencies more than 3.0 GHz witha simple increase in vcoreto

同伙现场fudzilla已试图证明的可靠性，画面镜头节能版agenafx1.9GHz频率和默认电压1.276五但也谈到可能性overclock等四个核心处理器的频率超过3.0千兆赫的简单加列表为1.328五。

The synthesis mechanism of Al_(13)in the process of electrolysis was discussed,the effects of electrolysis voltage,the original concentration of Al~(3+),the circulation mixing rate of the electrolyte and the exchanging frequency of the electrodes on the synthesis velocity of Al_(13),ratio of Al_(13)in total Aland the electrolysis time were studied.

本工作对电解过程中Al_(13)的形成机理进行了探讨，并研究了电解电压、Al~(3+)的初始浓度、电解液的循环搅拌速度和阴阳电极的互换频率对Al_(13)的合成速度、Al_(13)占总铝的比率及电解所需时间的影响，得出了电解法制备Al_(13)的最佳工艺条件：电极互换频率为1次·min~(-1)、电解液中Al~(3+)的初始浓度为0.5000mol·L~(-1)、电解电压为12V和0.5L·min~(-1)的电解液循环搅拌速度，在此条件下电解125min可制得碱化度为82.0%，Al_(13)占总铝的比率达91.2%的液体产品。

Result The study showed that there were two isozymes of serum amylase including Amy-1 and Amy-3 in Qinghai Alectoris graeca.

结果］青海石鸡血清淀粉酶有Amy-1，Amy-3 2种同工酶，其中Amy-1有AA、AB和BB 3种表型，表型频率分别为17.95%、66.67%、15.38%；AB为优势表型，Amy-1和Amy-1等位基因频率分别为0.5128和0.4872，基因杂合度为0.4997、青海石鸡血清淀粉酶活性为(566.62±112.20)U/L。

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