查询词典 difference frequency

In this paper the key points discussed were that, under the condition of a sharp hypsography of desert areas of Ordos basin, we used some new geophysical methods in the investigation of surface structure to obtain high accurate surface structure data and provide reliable scientific foundation for data acquisition and process; we dealt with the optimum coupling of surface geophones and the digital realization technique in desert areas, dug into a method of high frequency compensation according to attenuations by absorption near surface, adopted data processing and correction technique, solved high frequency attenuation and geophone coupling, eliminated the influences of sharply transverse fluctuation of hypsography in desert area on the seismic data, enhanced the fidelity and SNR of seismic section, and finally picked up more geologic information on the seismic profile and improved the precision of the lateral prediction for the reservoir beds.

本文旨在研究鄂尔多斯盆地沙漠区地表变化比较大的情况下，在表层结构调查中通过应用一些地球物理新方法，以获取高精度的表层结构数据，为资料采集和数据处理提供更科学的依据；研究在沙漠区地表检波器最佳耦合的方式与数字实现技术，研究通过近地表的吸收衰减规律进行高频补偿的方法，采用数据处理校正技术，解决高频吸收及检波器耦合，消除沙漠区表层横向剧烈变化对地震资料的影响，提高地震剖面的保真度和信噪比，从而使更多的地质信息能够从地震剖面中反映出来，提高储层横向预测的精度。

It is proved by the analytical and numerical method that the modulus of the Z transform of a finite impulse response sequence has no extreme values at poles (with maximums along imaginary axis and no extreme values along real axis), and the negative second order derivative of the modulus normalized along frequency axis with respect to angular frequency has maximums at the poles.

根据实测瞬态电磁脉冲响应，较好地反演了导体球和导体长椭球的冲激响应，测得了它们的雷达截面和谐振频率。用解析与数值相结合的方法证明了有限冲激响应序列Z变换的模在极点无极值（沿虚轴有极大值，沿实轴无极值），而沿频率轴的归一化值对角频率的负二阶导数在极点有极大值。

The frequency of spontaneous immortalization of human cells is low, but some immortalization genes can significantly increase this frequency.

人类细胞自发永生化的频率非常低，而一些永生化的基因可以显著增加这种频率。

Standard Frequency Index Method in counting the word frequency is an advanced scientific statistical method.

用《标准频率指数》统计词频是一种先进的科学的词频统计方法，本文探讨了此种方法在新闻语料词频统计中的应用，这在汉语词频统计中尚属首次。

Computer carving molds categories: High Frequency copper mold, bronzing die, metal plastic mould, metal stamping die English letters, metal crafts sculpture, greeting cards embossed die, plastic gift-chapter, line unleaded Wave Soldering version of the rule of the furnace, three-dimensional relief Three-dimensional sculpture, and other computer processing…… stickers printed categories: all kinds of stickers printed labels, stickers, bar code standard, easy shredding, arrow superscript, clothing footwear subscript cloth, water standard, such as India Mark…… Rubber signs categories: Crystal Dijiao, micro-injection, drops of plastic, such as Chapter…… silicone raw materials series categories: Japan KE-1310ST, KE-1310S, JX-860, JX-850 and its color paste, auxiliary agents and dedicated Tools such as…… PVC raw materials Series: highly transparent material, PVC powder paste, DINP oil, light and heat stabilizers, hardware oil, PVC color paste…… hot-ink series: low-temperature heat-Ink (round, rectangular, smooth, Dumb noodles) and color color paste, and so on…… flocking Series: Flocking paper, flocking oar, flocking Transfer…… machines, and other series: automatic multi-color flocking machine, planting colorful three-dimensional plastic machine, silicone molding package Machines, high-frequency embossing machine, plastic plate pipeline equipment…---- since we have since opened in accordance with the philosophy, in order to meet customer needs and quality to achieve customer satisfaction.

电脑雕刻模具类：高周波铜模、烫金模、五金塑料模、五金冲压英文字母模、金属工艺品雕刻、贺卡压花模、礼品胶章模、线路版过波峰焊无铅过炉治具、立体浮雕等各种三维电脑雕刻加工……不干胶印刷类：印刷各种不干胶标签、贴纸、条码标、易碎纸、箭头标、服装鞋帽布标、水标、印唛等……橡塑标牌类：水晶滴胶，微量射出，滴塑胶章等……矽利康原料系列类：日本KE-1310ST、KE-1310S、JX-860、JX-850及其色浆、辅助剂和专用工具等……PVC原料系列：高度透明料、PVC糊脂粉、DINP油、光热稳定剂、硬油、PVC色浆……热固油墨系列：低温热固油墨(圆角、直角、光面、哑面)和彩色色浆等……植绒系列：植绒纸、植绒桨、植绒转印纸等……机器系列：自动多色植绒机、立体多彩植胶机、矽利康整套成型机、高频压花机、橡塑标牌流水线设备等…----自开张以来我们都依照经营理念，为了配合客户的需求以及在质量上能达到客户的满意。

Computer carving molds categories: high frequency mode, bronzing die, metal plastic mould, metal stamping letters die, metal crafts sculpture, greeting cards embossed die, plastic gift-chapter, line version of a wave soldering lead-free governance with a furnace, such as three-dimensional relief Three-dimensional sculpture of computer processing… stickers printed categories: all kinds of stickers printed labels, stickers, bar code standard, easy shredding, arrow superscript, subscript cloth clothing shoes and hats, water standard, such as India Mark… Rubber Tag Categories: Crystal Dijiao, micro-injection, drops Chapter plastic raw materials, etc… silicone series categories: Japan KE-1310ST, KE-1310S, JX-860, JX-850 and its color paste, auxiliary agents and special tools… PVC raw materials Series: highly transparent material, PVC powder paste, DINP oil, light and heat stabilizers, hardware oil, PVC heat-ink color paste… Series: low-temperature heat-ink (round, rectangular, smooth, dumb noodles) and color color paste , Etc… flocking Series: Flocking paper, flocking oar, flocking Transfer, etc… machines Series: automatic multi-color flocking machine, planting colorful three-dimensional plastic machine, silicone package molding machines, high-frequency embossing machine, rubber Plastic signs pipeline equipment…---- since we have since opened in accordance with the philosophy, in order to meet customer needs and quality to achieve customer satisfaction.

电脑雕刻模具类：高周波模、烫金模、五金塑料模、五金冲压字母模、金属工艺品雕刻、贺卡压花模、礼品胶章模、线路版过波峰焊无铅过炉治具、立体浮雕等各种三维电脑雕刻加工…不干胶印刷类：印刷各种不干胶标签、贴纸、条码标、易碎纸、箭头标、服装鞋帽布标、水标、印唛等…橡塑标牌类：水晶滴胶，微量射出，滴塑胶章等…矽利康原料系列类：日本KE-1310ST、KE-1310S、JX-860、JX-850及其色浆、辅助剂和专用工具等…PVC原料系列：高度透明料、PVC糊脂粉、DINP油、光热稳定剂、硬油、PVC色浆…热固油墨系列：低温热固油墨(圆角、直角、光面、哑面)和彩色色浆等…植绒系列：植绒纸、植绒桨、植绒转印纸等…机器系列：自动多色植绒机、立体多彩植胶机、矽利康整套成型机、高频压花机、橡塑标牌流水线设备等

Common induction motor. Variable frequency variable speed system. Optimal startup frequency.Optimal timing range.

普通交流异步电动机，变频调速系统，最佳启动频率，最佳调速范围TM

The results show that the Ni-Fe coatings are acid-resistant to HNO3 and H2SO4.For Ni-Fe alloys without exfoliation,the EIS is composed by a capacitive arc at high frequency and an inductive arc at low frequency, and the radius of capacitive arc decreases rapidly and the inductive component weakens and disappears with time.

结果表明：Ni-Fe合金镀层具有良好的耐酸腐蚀性；在3.5wt%NaCl溶液中，腐蚀发生之前的镍铁合金镀层的电化学阻抗谱由一个高频容抗弧和一个低频的感抗弧组成；随着浸泡时间的延长，容抗弧半径快速减小，感抗弧减弱并消失。

For AA8090 alloy without exfoliation , the EIS is comprised by a depressed capacitive arc at high frequency and an inductive arc at low frequency, and the inductive component weakens and also disappears with time.

结果表明，剥蚀发生之前，AA8090合金电化学阻抗谱由一个压缩的高频容抗弧和一个低频感抗弧组成，且低频感抗成分随浸泡时间延长而减弱并消失；一旦发生剥蚀，其电化学阻抗谱即由一个高频和一个低频两个容抗弧组成。

A series of theoretical and experimental studies on the microstrip patch antennas with dielectric superstrates is carried out systematically. Firstly, a comprehensive survey of the microstrip antenna technology and its theories are presented. Then, two analysis techniques, named as the spectral domain Green's function method and the spectral domain integral equation method are developed. The SDGF method is a simplified analysis technique, which takes advantage of the spectral domain immittance approach to find the dyadic Green's function for the stratified media, and obtains the complete closed-form formulas for radiation patterns, directivity, efficiency, gain etc. Some interesting calculated results are presented. The SDIE method is capable of determining resonant frequency, radiation characteristics, input impedance etc, for the covered microstrip patch antennas. Comparing with other full-wave analyses it reduced computation and mathematical labour remarkably. The singularities near the pole location of the surface-wave modes and the difficulty of the integral computation over infinite range of oscillating integrands are dealt with actively and documented well. Results predicted by the SDIE method agree extremely well with our experimental results for resonant frequencies of various superstrates. The superstrate effects on impedance and radiation characteristics also have been investigated experimentally so that the gap due to lack of measured data and computed results for multi-layered superstrate has been filled to some degrees and two useful observations have been achieved for weakening the resonant frequency shift and optimizing the microstrip antenna gain. As a meaningful application, the design and analysis of a 4×4 patch array are introduced.

实用微带天线普遍加介质覆盖层来防护热，物理损伤和环境影响，也可能在飞行或严酷气候条件下自然形成覆盖层本论文对带介质覆盖层的微带贴片天线系统地作了一系列理论和实验研究首先，对微带天线技术和理论作了全面的综述然后，发展了两种分析方法，称为谱域格林函数法和谱域积分方程法SDGF法是一种简化的分析技术，它利用谱域导抗法来求得分层媒质的并矢格林函数，并得出方向图、方向性系数、增益等参数的完整的闭式公式，给出了一些令人感兴趣的计算结果SDIE法能确定介质覆盖微带天线的谐振频率、辐射特性和输入阻抗等与其它全波分析方法相比，它明显减小了计算量和数学工作量已有效地处理了表面波模极点附近的奇异性和对振荡的被积函数的无限区间积分计算的困难对于不同覆盖层情况下的谐振频率，由SDIE法所预示的结果与我们的实验结果吻合得很好对于覆盖层对阻抗和辐射特性的影响也已作了实验研究这在某种程度上填补了缺少实验数据和计算结果之间的间隙，并得出了缓解谐振频率偏移和优化天线增益的两点有用的结论作为有意义的应用，介绍了一个4×4元矩形贴片天线阵的设计和分析。

"Second Life is remarkably easy to work with, and is very popular,"

"第二次生命是显着容易的工作，并且很受欢迎，"

For example, we usually assume that materials are homogeneous and isotropic and free of internal defects or flaws.

为了得到适合有限元分析的模型，我们必须经过如图2所示的简化步骤。