查询词典 threshold frequency

Using two channel tree-structured filter banks, an image can be decomposed into a pyramid structure, with various band information: such as low-low frequency band, low-high frequency band, high-high frequency band etc.

小波分析是一种时间-尺度分析方法，可被看作傅立叶变换之后又一里程碑式的发展，是近年来迅速发展起来的新兴学科，小波变换应用于图像处理的基本思想就是把图像进行多尺度、空间-频率分解。

In the past, the high frequency resonance technique is usually applied in the envelope detection for a vibration signal with amplitude modulation. When applying the Hilbert transform in the high frequency resonance technique for the envelope detection of vibration signals, the computing burden is very high. On the other hand, when applying the linear least squares analysis method, the computing burden is lower. When applying the envelope detection in the lowest vibration mode, an accelerometer with the low-pass filtering cutoff frequency at 4kHz should be choose.

在过去的研究方法中，振动讯号之振幅调变通常以高频解调分析法应用於包络讯号侦测，而高频解调方法应用希尔伯特转换的包络分析，所需要的计算量是非常的高，若以线性最小平方分析法应用於高频解调分析法中，则所需要的计算量较小，如果以最低模态来估测包络讯号时，可以适当的选取加速规来代替低通滤波器，而加速规的截止频带必须在4kHz左右。

Where the irrigating frequency was 1 or more than 1 every four days, it did not remarkably affect the ET of potato; but where the irrigating frequency was 1 every six days or 1 every eight days, the ET of potato measured by a lysimeter was obviously higher than what it was in the treatment with a higher irrigating frequency.

大于或等于1次/4 d滴灌灌水频率对马铃薯的腾发量影响不明显；但当滴灌灌水频率为1次/6 d或1次/8 d时，由蒸渗仪测得的马铃薯腾发量明显低于更高频率处理。

In this study, two-tone stimulus paradigm with inter-pulse interval of 50 ms was used and two kinds of maskers, static frequency masker and dynamic frequency masker (up-sweep frequency modulation sound), were delivered to the animal before the probe under free field stimulation conditions.

自由声场刺激条件下，采用一定间隔的双声刺激模式(前一个声音为掩蔽声，后一个声音为探测声)，记录昆明小鼠下丘(inferior colliculus， IC)神经元的声反应。

On the basis of Raman and FTIR spectra research on melt structure and water solubility mechanism in albite glasses, we can make the following conclusions:(1) Higher pressure (1bar-2. 0GPa) can lead to below frequency region (50-650cm〓) shift to higher frequency and become narrower, and result in high frequency region (850-1300cm〓) move to lower wave number and become narrower at the same time. These are consistent with the decrease of average T-O-T angle and distribution scope of bond angles (0). In addition, the intensity of 580cm〓 band decrease with increase of pressure and the changes are obvious while pressure is in the range of 0.8-1. 0GPa. And these result from the"collapse"of the planar three membered -containing rings within the glass structure.

通过对高温高压下钠长石熔体结构及水在钠长石熔体中溶解机制的Raman和FTIR光谱实验研究，可以得出以下结论：(1)随着压力升高(1bar-2.0GPa)NaAlSi〓O〓熔体玻璃Raman光谱的低频区(50-650cm〓)不断变窄并向高频方向移动，同时高频区(850-1300cm〓)不断变窄且向低频区方向移动，这表明随着压力升高T-O-T键角不断减小，并且分布范围变窄，T-O-T键角这种变化从而可使T-O键的力常数减小，导致键强减弱；另外，580cm〓谱峰强度随着压力升高不断减弱，并在0.8-1.0GPa时最为显著，这是由于在0.8-1.0GPa时包含的平面三元环结构的"垮塌"造成的。

Electronic equipment categories: two core, three core insulated wire conduction test machine, an integrated plug-line tester, polarity tester, full-featured integrated precision wire tester, analog / digital storage oscilloscope, signal generator, the standard signal source, frequency dollars, Millivoltmeter distortion device,Miriam, LCR digital electric bridge, voltage tester, insulation resistance tester, grounding resistance tester, leakage current tester, electronic load, electric parameter measuring instrument, digital power meter, parameter measuring instrument transformers, transformer automatic testing system, transformers ring than phase tester, electrical safety parameter tester, variable frequency power supply, power supply, high-frequency shielding net room, temperature and humidity table, multimeter, power meter, tachometer, anemometer, coating thickness, coating thickness, vibration measuring instrument, the Composite test machines (motors, fans, hair dryer, lamps, fruit juice machine) and so on.

二芯、三芯线材绝缘导通测试机、插头线综合测试机、极性测试仪、全功能精密线材综合测试机、模拟/数字存储示波器、信号发生器、标准信号源、频率计、毫伏表、失真仪、抖晃仪、LCR数字电桥、耐压测试仪、绝缘电阻测试仪、接地电阻测试仪、泄漏电流测试仪、电子负载、电参数测量仪、数字功率计、变压器参数测量仪、变压器自动测试系统、变压器圈数比相位测试器、电器安全参数综合测试仪、变频电源、电源供应器、高频屏蔽网房、温湿度表、万用表、功率表、转速表、风速计、涂层测厚仪、镀层测厚仪、振动测量仪、综合测试机（马达、风扇、电吹风、灯饰、果汁机）等。

By detecting the oscillation circuit natural frequency to determine the level of water.The frequencymeter use the Microprocessor internal counter to counting the film resonant frequency of the water level sensor pulse,then Microprocessor regular function to achieve frequency testing, final adoption of LED display circuit dynamic numerical show.

该频率计直接利用单片机内部的计数器对薄膜谐振式水位传感器的频率脉冲信号进行计数，然后利用单片机的定时功能实现对频率的检测，最后通过LED动态显示电路显示数值。

In chapter 4, the Newlands harmonic wavelet is improved and a new type of wavelet with better time-frequency characteristic is constructed. Frequency band of signal can be divided arbitrary with the improved harmonic wavelet so that the phenomena of aliasing are reduced. Several typical fault signals in Electromechanical System are analyzed with it. In addition to the improved harmonic wavelet in chapter 4, a new half-complex wavelet is presented to improve the complex wavelet, which is given by Chaari.O. A unilateral recursive algorithm is derived to improve the real-time characteristic. A parameter n is imported to make the time-frequency and filtering characteristics of it better and its ability of extracting fault feature is enhanced.

第四章通过对Newland谐波小波的改进构造频域紧支撑、时域性能良好的新型小波函数，可实现信号频带的任意划分，从而减少频带混叠现象，采用改进的谐波小波对多种典型的机电系统故障信号进行了分析；以Chaari.O复小波为基础构造了一个半复小波，从提高复小波算法的实时性出发，推导了半复小波单向递推算法，通过给原小波设置可调参数的方法，实现了一种能满足小波基本条件的复值小波，可以通过参数的调整调节小波滤波器在Hilbert空间的时频特性和相应的滤波性能，以加强半复小波对故障特征的提取能力。

Intravoneous injection of 0.5mg/kgBW jingsongling cause the 60 minutesrelaxation of goat gastric motor.The effects of jingsongling on the gastric motor ofgoat is major of effects of α2 -adrenoceptor agonist,as well as that of α1 -adrenoceptor agonist,the effects of α1 -adrenoceptor agonist concentrate at thecardic and pylorus;the function of α2 -adrenoceptor exit widely at cardic,pylorus,rumen,reticulum,omasum and abomasum,the function at different part is not the same.The lowestdose of jingsonglinginhibiting the amplitude and frequency of the gastricmyoelectric is 0.01mg/kgBW;the influence of jingsonglingto the gastricmotility of goat is dose-dependent,and the amplitude regain after the frequency ofgastric myoelectriv wave.When the goat revived,the gastric motor function is notreach the level of the normal;the major reason ofjingsongling cause the goat gastricrelaxation is the amplitude renew slowly.The intravoneous injection ofjingsonglingfirst,after 5 minutes,intravoneous injection the antagonist,the effect of prazosin and idazoxan mixed is best,which can fast reversal of theinhibition of jingsongling on the gastric motor of goat,the effects of idazoxan isgood,and the prazosin block the effection of jingsongling is better than that ofxylazine,especially at cardia and pylorus.When intravoneous injection of0.5mg/kgBW idazoxan and/or prazosin only,the amplitude of gastric myoelectric ingoat increases at a certain degree,but the frequency is not changed.

静脉注射0.5mk/kgBW的静松灵引起山羊胃蠕动弛缓长达60分钟；静脉注射0.5mg/kgBW的静松灵对山羊胃蠕动机能的影响是以α2肾上腺素受体作用为主的，兼有α1肾上腺素受体的作用，而且静松灵的α1肾上腺素受体的作用主要集中在幽门和贲门；α2肾上腺素受体的作用广泛存在于贲门、瘤胃、网胃、瓣胃、皱胃和幽门中，不同部位间有功能上的差异；静注0.01mg/kgBW的静松灵是对山羊的贲门、瘤胃、网胃、瓣胃、皱胃和幽门的肌电波频率和振幅均产生影响的最低剂量；静注一定剂量的静松灵对山羊胃蠕动的抑制作用与剂量呈相关性；而且山羊胃肌电波振幅的恢复比肌电波频率的恢复慢；苏醒时山羊的胃蠕动机能尚未恢复到正常状态；静松灵引起山羊胃弛缓的主要原因是由于胃肌电波的振幅恢复慢；静注0.5mg/kgBW的静松灵，5分钟后静注0.5mg/kgBW的拮抗剂时，咪唑克生+哌唑嗪的作用最好，能迅速地逆转静松灵对山羊胃蠕动的抑制作用，咪唑克生也有很强的拮抗作用，而哌唑嗪对静松灵的拮抗效果好于对隆朋的拮抗；单独静注0.5mg/kgBW的咪唑克生和/或哌唑嗪时，山羊的瘤胃、网胃、瓣胃、皱胃、贲门和幽门的肌电波振幅有一定程度的增强，而肌电波频率未见变化。

Author, secondly, starts from the approximate expandness of square root operator, perform mathematical calculations for finite difference operator in frequency-space domain, Fourier finite difference operator in mixing domain(frequency-space and frequency-wavenumber domain) and general screen operator in mixing domain, compare and discuss their precision of their wavefield, adaptability for lateral velocity variations, computation efficiency and stability.

第二，从平方根算子的近似展开出发对频率—空间域的有限差分算子、混合域(频率—空间域；频率—波数域)的Fourier有限差分算子、混合域的广义屏算子进行了推导并对其波场描述精度、对横向变速的适应性、计算效率和稳定性进行了比较与评述。

Foods high in this vitamin include oily fish such as salmon, tuna and, and fish liver oils.

维生素D含量高的食物包括诸如大麻哈鱼、金枪鱼和鲭鱼之类的油鱼以及鱼肝油。

We need you to cosign our public letter demanding that press intimidation cease immediately, and that all charges be dropped.

我们需要您cosign我们的公共信，要求记者立即停止恐吓，并要求所有收费下降。