Special structures for coherent FBG group and fiber MZI sensors are designed. For weak signals or strongly interferenced signals, winding method, flat layout method, special coated fiber method or spring separation method, solid separation method are proposed, and the recognition ability for object signals is improved. The physical features of the object signals are extracted from various aspects by the parameters analysis such as maximum amplitude, RMS, ringing count, pulse count, event count and duration, by the waveform transform analysis such as Fourier analysis, AR spectrum analysis and joint-time-frequency analysis, and by statistic analysis of the parameters analysis results or waveform transform analysis results. And the features of different object signals are extracted when the optical fiber sensing systems are applied for railway location, axel counter, fence destruction monitoring and pipe destruction monitoring. Auto-recognition of the railway location signals with coherent FBG sensing system is realized by a linear discrimination function based on Fisher criterion. And auto-recognition of the fence destruction signals with a MZI sensing system demodulated by a 3×3 coupler is realized by a LMBP neural network.
对相干FBG组及光纤MZI传感器的具体结构进行了设计，分别针对微弱振动信号及强干扰信号，采用缠绕法、平面法、特殊材料涂覆光纤及弹簧隔离法、整体隔离法等设计光纤传感器，提高了对目标信号的识别能力；通过提取信号最大幅度、有效电平、振铃计数、脉冲计数、事件计数、持续时间等参数，对信号进行傅立叶谱分析、AR谱分析、时频分析，并对不同参数及频谱分析结果再进行分布统计分析，实现了多角度的信号物理特征提取，应用于列车区间定位、列车计轴、围栏破坏性行为监测、管道破坏性行为监测等场合，实现了各种不同目标信号的特征提取；采用基于Fisher准则的线性判别函数，实现了基于相干FBG组传感系统的列车区间空闲或占用的自动识别；采用LMBP人工神经网络，实现了基于3×3耦合器解调的MZI传感系统的围栏破坏性行为的自动识别。
The ink-jet system is modeled for analysis in this paper. Various structures and fluid flow, which affect the quality of ink droplets, are analyzed with VOF in the paper. The results show that the alternative frequency, average value and amplitude of efflux velocity have great influence on the quality of ink droplets. Further study shows that disturbance frequency extremely affects disturbance jetflow.
本文建立了喷码机喷墨系统的模型，应用VOF法对不同结构和不同流体流动状态下的喷墨情况进行了分析，研究了这些结构参数和流体流动状态对墨滴质量的影响，结果表明射流速度的变化频率、射流的平均速度和射流速度变化的幅值等对墨滴质量有较大的影响。
Through simulation of the real process of thomcolumbar burst fracture and use of modem dynamics techniques, the present study was (1) to investigate the kinetic relationship between structural damage and impact energy absorption and dynamics mechanism of thoracolumbar burst fracture by quantitative analysis of various injured segments; (2) to explore the instability mechanism of L1 vertebral burst fracture and its injury threshold by three-dimensional analysis of the injured segment with stereophotogrammetry in combination of transient physical parameters, anatomy and image; (3) to explore the corresponding relationships between impact energy, geometry parameters and biomechanics by geometry and biomechanical analysis of thoracolumbar burst fracture, which may provide an objective standard for evaluation of spinal injury severity and experimental evidence for adoption of biomechanical treatment in clinic; (4) to evaluate the fixation effect of different instruments and the effect of intervertebral bone graft on segment fixation by analysis of the threedimensional stability of different internal fixation instruments and their decompression of the spinal canal, which may provide experimental evidence for therapeutical selection for thoracolumbar burst fracture in future; and finally to investigate the effect of various instrument fixation on dynamical characteristics by comparison and quantitative analysis of frequency and amplitude responses, which may provide certain theories and experimental evidence for application of vibration test to judge the stability of the spine.
本研究从胸腰段脊柱爆裂骨折发生的实际过程出发，以现代动力学检测及计算机多通道高性能数据采集分析系统等高新技术为基础，实时量化分析损伤节段的工程参数，揭示了结构破坏与能量吸收的变化规律，探讨了胸腰段脊柱爆裂骨折的瞬态损伤机制；利用三维立体摄像技术，对不同损伤程度的节段进行三维运动分析，结合瞬态物理参数、影像学和病理解剖，明确了〓椎体爆裂骨折的失稳机制及损伤阈值；通过对胸腰椎爆裂骨折的几何学变化及生物力学分析，明确了撞击能量与几何参数、几何参数与生物力学的相应关系，为评判脊柱损伤程度提供了客观标准，为治疗中采取适宜的生物力学方法提供了实验依据；通过对比分析不同内固定器械的三维稳定性和对椎管的减压作用，评价不同器械的复位固定作用，同时比较椎体间植骨对节段固定作用的影响，为今后临床胸腰段脊柱爆裂骨折的治疗选择提供依据；利用振动测试与分析技术，比较及量化分析了不同致伤状况的频幅响应特征，比较分析了各种器械固定对动力学特性的影响，为今后临床建立基于振动测试与分析技术判断脊柱稳定性的诊断方法，提供了一定的理论和实验依据。
A detection method of double-threshold constant false alarm movement object on double-base synthetic aperture radar includes finalizing distance compression of various pulse-sampling, dividing orientation time to be multiple CPI, carrying out FFT in each CPI to enter orientation frequency domain, comparing data amplitude of frequency channel at external of clutter region with the first threshold and outputting point trace, making coagulation on point trace, making Hough transform in point trace domain and making decision of the second threshold.
本发明涉及一种用于双基地合成孔径雷达的双门限恒虚警运动目标检测方法，其特征在于：1对每个脉冲采样完成距离压缩；2把方位时间分割成多个相干处理间隔；3在每个CPI内做快速傅立叶变换进入方位频域；4把杂波区外的频率通道的数据幅度和第一门限比较做判决并输出点迹；5点迹凝聚；6在点迹域做Hough变换并做第二门限判决。
Besides various interferences, the wave front diffusion, the ground absorption and the attenuation are all the causes of a weak seismic reflection and, plus the complicated superficial geologic setting and the reservoir bed features of low amplitude, low porosity and low permeability of the compacted thin detrital rock in HJQ, the conventional seismic amplitude fidelities do not meet the criteria of the seismic inversion.
除各种干扰外，地震波传播过程中的波前扩散、大地吸收、衰减等使地震反射能量变弱，加之杭锦旗地区复杂的表层地质条件和低幅、低孔、低渗致密性薄层碎屑岩的储层特点，使常规保幅地震资料离地震反演的要求还有差距，并且反演技术本身不具备噪音识别功能，包含噪音的反演必然会影响地质效果。
Through tests with various combination of temperature, maximum stress, stress amplitude and mean stress, the influence law of such factors on fatigue and creep of material and their interaction are analyzed, four kinds of fatigue creep fracture characteristic charts are established, the judgment condition for exemption from creep failure analysis are proposed preliminarily, meanwhile it is found mean strain rate is the major factor that affects cycle life.
通过温度、最大应力、应力幅、平均应力的不同组合试验，分析了这几种因素对材料疲劳、蠕变及其交互作用行为的影响规律，建立了四种疲劳蠕变断裂特征图，初步提出了免于蠕变失效分析的判定条件，同时发现平均应变速率是影响循环寿命的主要因素。
An example of CODAD system was calculated to study the sum vector of relative amplitude under various firing conditions and working conditions.
结合某船CODAD推进系统实例，对各种发火状态和运行工况下的相对振幅矢量和进行了研究，得出了不同V型夹角情况下扭振激励的主要差异。
The stability of RFID card confines its practice and development in engineering all the time. Facing such question, a kind of RFID card used in the safety management and automatic fee-charging system etc. is introduced. Meanwhile, the core research on the stability of RFID card is studied, and then various causes of the frequency drift, frequency shift and clutter wave in amplitude modulation circuit are analyzed. New design of amplitude modulation circuit is proposed to resolve this problem by using the characteristic of micro-strip less influenced from outside. The experiment results show that this method can improve the stability of the RFID card and enhance the ability to avoid disturbances obviously.
稳定性问题一直制约着RFID电子卡的应用与发展，针对此种问题，介绍了一种应用在汽车安全管理及其自动收费系统等场合的RFID电子卡；重点对这种RFID电子卡的稳定性进行了研究，分析讨论了其载波幅度调制电路出现载波频率点漂移、偏移及杂波产生的各种原因，提出对载波幅度调制电路改进设计作为解决的方法，微带线受外界因素影响小的优点在这种方法中得到充分体现；实验结果证明，该方法提高了RFID电子卡的工作稳定性，增强其抗干扰能力。
While disturbance frequency is decided, uniform and large distance droplets could be obtained only by adjusting both average value of efflux and amplitude of efflux. Various fluid flow, structures and electrical factors, which affect ink droplet forming, are analyzed in this paper.
射流的平均速度和射流速度变化的幅值对射流的形态有较大影响；在射流速度的变化频率确定后，要同时调整射流的平均速度和射流速度变化的幅值才有可能得到大小均匀且间距较大的墨滴。
To test the effect of viscosity on the stress distribution of a impacted teeth. 2D finite element models of maxillary 1st premolar with various endodontic treatment were established. Sequently, dynamic force with a maximum amplitude of 300N, was used to applied to the FE model on central fossa and palatal cusp.
此外，本研究建立一个上颚第一小臼齿的二维有限元素模型，模型经收敛分析与可信度确认后，模拟动态咬合力300牛顿作用在咬窝与颚侧咬头上，并分析不同治疗步骤中牙齿内部应力的改变。
According to the characteristics of field dis tribution, a method to abstract quadrature component and amplitude of vertical magnetic field in near-field zone is proposed. Based on the dual-fre. quency combi nation wave theory, apparent resistivities with various forms at center and any point in near-field zone of current loop on stratified earth are defined.
根据场分布的特征，提出了在近区提取磁场垂直分量的正交部分和磁场垂直分量的振幅作为研究对象的方案；根据双频组合波理论，利用它们所对应的双频差，给出了载流回线中心点和近区任意点的视电阻率不同形式的表达式。
Turbulence is composed of hierarchical structures of various scales, various amplitude and various degree of coherence.
湍流是由各种不同尺度、不同幅度和不同相干度的层次结构组成的。
Data is modulated onto the carrier by various methods, such as amplitude modulation, frequency modulatikon, etc.
数据调制，有各种方法，例如振幅调制和频率调制。
On the basis of the analysis of various factors affecting the precision of amplitude modulation measurement circuit of inductance sensor, it is presented that improving its precision by using digital synthesizing, self fixed amplitude, digital phase sensitivity detection, digital set average technique and so on.
在分析影响调幅式传感器测量电路精度因素的基础上，提出利用数字合成技术、自稳幅技术、数字式相敏检波技术、数字集合平均技术等措施，来改善调幅式传感器测量电路的检测精度。
Finally, various frequency-amplitude response curves are given to show the effect of the amplitude, frequency and viscosity of inspiration on response amplitude.
由得到的频率一振幅响应曲线，研究了激励强度、频率和阻尼对响应振幅的影响。
Numerical Simulation of the Amplitude - limiting Efficiency for Various Sizes of the Diaphragm
光阑对激光限幅器限幅效率影响的数值仿真
Realize signal modulation and demodulation functions, including various types of modulation such as ASK (amplitude modulation), PSK (phase modulation), FSK (FM).
实现信号的调制解调功能，包括各类调制如ASK（调幅），PSK（调相），FSK（调频）。
The frequency and amplitude of vibration system of laminated plate and shell is affected by various factors.
复合材料层合板壳振动系统的频率、振幅受各种因素影响。
Three samples weres separately welded in various frequency and amplitude of vibration.
选取三组试样分别在不同振动频率和振幅的条件下，进行振动焊接。
Various methods of angle measurement in MTD radar are reviewed and compared in this pa - per, Comparison result shows that the measurement accuracy of azimuth angle in MTD radar can be im - proved by using amplitude message in coherent integration.
对MTD雷达的几种测角方法进行了综述和比较，结果表明，利用相于积累的幅度信息可以改善MTD雷达的方位测角精度。