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1.
文章介绍了一种根据红外探测器光谱响应的特点和基于参考源的两点温度非均匀性校正理论,采用FPGA器件实现红外成像系统的实时非均匀性两点校正,并对图像进行了增强． 相似文献
2.
林森 《安徽教育学院学报》2014,(3)
非均匀阵列有其特殊的应用价值,对此本文提出一种基于伪随机码加权的非均匀天线阵的自适应接收多波束形成新方法。描述了该方法的工作原理,建立了非均匀直线阵的信号模型,给出了波达方向估计和接收多波束形成算法,仿真验证了该方法的有效性和灵活性。其优点是无需信号环境的先验知识,无需计算加权矢量,只需相关运算即可形成接收多波束,因此简单高效。 相似文献
3.
非制冷红外焦平面技术在过去的几年内得到了飞速发展,并在军事、商业和民事中得到成功应用.过去曾是制冷型焦平面占据的应用领域,现在逐渐为价格低、重量轻、功耗低、体积小、性能可靠、操作方便的非制冷红外探测器所代替.非制冷焦平面阵列基本上有两类:一类是铁电-热电型辐射计;另一类为电阻型测辐射计. 相似文献
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非制冷红外焦平面技术在过去的几年内得到了飞速发展，并在军事、商业和民事中得到成功应用．过去曾是制冷型焦平面占据的应用领域，现在逐渐为价格低、重量轻、功耗低、体积小、性能可靠、操作方便的非制冷红外探测器所代替．非制冷焦平面阵列基本上有两类：一类是铁电-热电型辐射计；另一类为电阻型测辐射计． 相似文献
5.
由微悬臂梁结构组成的红外焦平面阵列(FPA)是基于微机电系统结构的非制冷型红外成像系统的核心技术,通过对双金属悬臂梁应力和应变的分析,阐述了影响微悬臂梁热机械性能的主要因素,为正确选择微悬臂梁结构的材质提供理论依据. 相似文献
6.
强晓凤 《广东技术师范学院学报》2006,(4):28-30,150
本文讨论了从非均匀采样重建频带有限信号.选取不同的非均匀采样序列,利用有效算法进行重建,从得到的结果,分析采样的非均匀性对重建的影响. 相似文献
7.
采用LabVIEW软件对脉冲编码调制中数字化量化进行了计算机模拟仿真,对均匀量化器和最佳非均匀量化做了简要介绍和对比,通过非均匀量化的仿真结果分析了量化误差引起的信噪比特性,为实际语音传输系统提供了基本的依据。 相似文献
8.
目的：由于多环境因素的动态耦合作用,单层球面网壳的温度变化具有强时变性和显著的非均匀特征。然而,传统的设计观念将结构的温度变化等效为气温的均匀升降,这可能导致潜在的安全隐患。通过数值模拟、实验研究和理论推导,本文旨在分析单层球面网壳温度的时变规律和分布模式,研究非均匀热效应及其影响因素,并针对该类结构提供非均匀热荷载的设计方法。创新点：1.根据真实热边界条件,模拟单层球面网壳的长期温度变化并剖析其时变规律和分布模式;2.基于理论推导、数值和实验验证,提出单层球面网壳非均匀热荷载的设计方法;3.对比结构均匀与非均匀热效应,分析影响热效应的施工因素。方法：1.通过仿真计算,运用真实热边界条件模拟单层球面网壳的长期温度变化,分析温度场的时变规律与分布模式;2.通过理论推导,构建单层球面网壳非均匀热荷载的设计方法,并通过现场试验和数值模拟验证方法的有效性;3.通过应用热荷载设计方法,研究结构的热效应及其影响因素。结论：1.单层球面网壳温度场具有强时变性和非均匀性特征,不均匀程度取决于热边界条件,分布模式取决于太阳与结构之间的位置关系;2.运用理论推导完成温度场的简化计算,实现非均匀热荷载的设计... 相似文献
9.
由微悬臂梁结构组成的红外焦平面阵列(FPA)是基于微机电系统结构的非制冷型红外成像系统的核心技术。通过对Al/SiNx双材料体系的理论分析,得出了微悬臂梁的热机械性能与双层梁的厚度比之间的关系。 相似文献
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11.
孟丽娅 《重庆大学学报(英文版)》2005,4(2):67-69
1 Introduction 1 With progress of technologies, uncooled microbolometer (UMB) is a viable alternative to many cooled IRFPAs (Infrared Focal Plane Arrays) because of its low manufacture cost, low power consumption, light weight and acceptable performance. One of the major problems in the readout circuit design of the microbolometer is the wide dynamic range of the interface circuit caused by serious nonuniformity. The nonuniformity, also referred as spatial noise, is a result of fabricatio… 相似文献
12.
Different two-equation k-ε models were used to simulate the gas flow field generated by a new type of circulating fluidized bed reactor with venturi gas distributor. The numerical results were compared with the experimental data. It has been shown that the simulation results from the standard k-ε model have the best match with the experimental data. Based on this model, the gas flow field in the venturi diffuser and riser was analyzed by the concept of velocity nonuniformity and dead zone percentage. Both the nonuniformity of gas velocity and the dead zone percentage reach the maximum at the venturi outlet due to the effect of the vortex. At the same time, it provides a good platform for the further optimization of the inlet configuration of circulating fluidized bed reactor. 相似文献
13.
介绍了用神经网络修正传感器静态误差的原理和方法，构造了基于有监督特征映射(SLFM)网络的误差修正模型，探讨了实现该模型时网络的拓扑结构、学习和预测机制、以及参数选择，提供了其对CYJ-101型传感器进行预测修正的实验，实验结果良好。 相似文献
14.
研究了Ｓ２５Ｃ与ＳＵＳ４０５钢的真空扩散焊接的变形率、抗拉强度及硬度．金相及显微分析可见，在焊接接头的结合界面上，Ｓ２５Ｃ钢一侧存在脱碳层，ＳＵＳ４０５钢一侧存在增碳层，这是造成接头组织分布及硬度分布不均匀的主要原因．还采用电子探针进行了微区分析，研究了碳、铬元素的分布． 相似文献
15.
Joshua N. Pritikin Lance M. Rappaport Michael C. Neale 《Structural equation modeling》2017,24(3):395-401
The precision of estimates in many statistical models can be expressed by a confidence interval (CI). CIs based on standard errors (SEs) are common in practice, but likelihood-based CIs are worth consideration. In comparison to SEs, likelihood-based CIs are typically more difficult to estimate, but are more robust to model (re)parameterization. In latent variable models, some parameters might take on values outside of their interpretable range. Therefore, it is desirable to place a bound to keep the parameter interpretable. For likelihood-based CI, a correction is needed when a parameter is bounded. The correction is known (Wu & Neale, 2012), but is difficult to implement in practice. A novel automatic implementation that is simple for an applied researcher to use is introduced. A simulation study demonstrates the accuracy of the correction using a latent growth curve model and the method is illustrated with a multilevel confirmatory factor analysis. 相似文献
16.
Civil and Hydraulic Engineering Calculation of corrosion rate for reinforced concrete beams based on corrosive crack width简 总被引：1，自引：0，他引：1
This paper deals with a correction method for corrosive crack width caused by non-uniform corrosion. Considering the corrosion cracking characteristics of a reinforced concrete structure, a correction model of corrosive crack width involving the mutual impacts between adjacent measuring points is established. The calculation model for steel bar corrosion rate for single point is obtained through quantitative analysis and accelerated corrosion tests on more than 70 reinforced cubic members. Two methods are suggested by combining two models, the correction and the corrosion calculation ones. Electrolyte accelerated cor- rosion tests on seven beams are carried out to verify these methods. The experimental results show that the ratio between the maximum corrosion rate by the indirect method and the measured average value ranges from 1.4 to 2.4, and the indirect method is shown to be an effective method for calculating the maximum corrosion rate. 相似文献
17.
采用基于方位特征集的方法,分析了一种新型四自由度并联机构,即2PUS-2PRS并联机构的自由度数目和类型,给出了该并联机构的基本运动链（BKC）及其耦合度计算;利用矢量法运算建立了该并联机构的位置逆解模型,得到了可行的16组位置逆解,并据此模型结合一种典型运动实例,得到各驱动杆长的变化规律。文章还对其上述分析的正确性进行了有效验证。 相似文献
18.
Mask synthesis and verification based on geometric model for surface micro-machined MEMS 总被引：2，自引：0，他引：2
Traditional MEMS (microelectromechanical system) design methodology is not a structured method and has become an obstacle for MEMS creative design. In this paper, a novel method of mask synthesis and verification for surface micro-machined MEMS is proposed, which is based on the geometric model of a MEMS device. The emphasis is focused on synthesizing the masks at the basis of the layer model generated from the geometric model of the MEMS device. The method is comprised of several steps: the correction of the layer model, the generation of initial masks and final masks including multi-layer etch masks, and mask simulation. Finally some test results are given. 相似文献
19.
INTRODUCTION When designers develop microelectromechani- cal system (MEMS) devices with the traditional ap- proach, they should devise the mask-layouts and fabrication process instead of the function and shape of the MEMS device. The geometric model of the MEMS device is then derived based on the simulated fabrication according to the devised mask layout and the process. This is analogous to generating a geo- metric model from the NC tool paths in the macro world. Obviously it is uni… 相似文献
20.
固定资产投资与国内生产总值的误差修正模型研究 总被引：2，自引：0，他引：2
王伏虎 《江苏理工大学学报(社会科学版)》2005,7(6):85-89
运用协整理论和误差修正模型研究固定资产投资和国内生产总值之间的关系，可以发现它们之间存在长期均衡的协整关系，使用误差修正模型比普通的单变量方程更能反映两者长期和短期的关系，还可以避免谬误回归问题。 相似文献