基于人工神经网络的震级与断裂长度的关系

应用人工神经网络分别建立了震级与地表断裂长度及活断层长度的关系，一定程度上提高了由断裂或 断层长度预测震级的可靠性。     

Glare‐limited appearances in HDR images

Abstract— Intraocular glare and simultaneous contrast control appearance in high‐dynamic‐range (HDR) images. This paper describes unique test targets that simulate real images. These targets change the HDR range by 500 times, without significantly changing the veiling glare on the retina. As well, these targets have nearly constant simultaneous contrast. The range of appearances possible from HDR images with different average luminances were measured. The targets displayed a maximum luminance range of 5.4 log units. Using magnitude estimates (MagEst) of appearances, the relationship between luminance and lightness from white to black was measured. With one exception, only small changes in appearance with large changes in dynamic range were found. It was also found that appearance was scene‐dependent. The same dark grays (MagEst = 10) were observed with luminances of 10, 4.2, 1.1, and 0.063, depending on the percentage of white area in the surround. Glare from more white increases the retinal luminance of the test areas. Simultaneous contrast counteracts glare by making the appearance range (white‐black) with a much smaller range of luminances. Appearance is controlled by both the optical scattered light and the spatial processing. A single tone‐scale function of luminance cannot describe appearance controlled by scatter and spatial processing.     

复合调剖体系在低渗透裂缝性油藏中的研究与应用

通过低渗透裂缝性油藏的特征,在认识油藏特性的基础上,认真研究堵剂性能与堵剂配方,认为采用水驱流向改变剂+疏水统合聚物复合堵剂是治理裂缝性油藏见水井深部调剖的有效途径,在取得明显治理效果的基础上并提出有针对性的建议,为低渗透油藏后期的有效开发提供了技术支撑。     

一种基于幅度预测的隐写分析方法

 提出一种基于图像小波系数相关规律性分析及幅度预测的隐写分析方法,首先对小波系数所处局部区域的相关规律性强弱进行定量分析;然后选择规律性较强的局部区域,利用自然图像小波系数在尺度间和尺度内的统计相关性,以及不同图像分量小波系数之间存在的相关性,对小波系数的幅度值进行自适应预测;最后通过分析预测误差的统计特性来判断图像中是否含有隐秘信息.实验证明该方法对于小波域信息隐藏具有较好的检测效果.     

铁路货车轴承密封罩压装最小过盈量分析

应用ABAQUS有限元分析软件对352226X2-2RZ型铁路货车轴承密封罩压装过程进行了模拟,分析了密封罩脱出的原因,得出了外圈入口、外圈牙口及其沟槽部位的最大等效应力、最大接触应力和塑性应变数值,以及不同过盈量对最大等效应力、最大接触应力和塑性应变的影响规律。通过用YN-2型密封罩压装扭矩测量仪对密封罩压装效果进行检测,确定了密封罩的最小压装过盈量。     

CRH3动车轮对压装选配

轮对的压装质量与其性能有着直接的关系。传统的轮对压装多是依据经验来进行轮轴的选配,没有明确的参考标准,因而导致压装合格率较低。文章以CRH3型动车组轮对为例,利用Ansys软件建立了二维轴对称模型对轮对压装过程进行模拟仿真,通过非线性接触分析得出过盈量、摩擦因数、公差等因素对轮对压装应力分布及压装曲线的影响。结果表明,过盈量对轮对应力及压装曲线均有较大的影响;摩擦因数对应力值影响较小,对压装曲线则影响较大;公差对轮对应力影响比较明显,对压装曲线的影响则比较微弱。最后在满足国家标准要求的前提下给出一个范围,以此作为轮对压装的参考标准,可提高轮对压装的质量,保证机车安全平稳运行。     

A new color image space HRU related to the CIEL*a*b* color space

The color image space with one kind of merit color image scales (WIP) is derived using the psychophysical method of magnitude estimation method, usually used in visual assessment of color appearance, which can be used to describe the color image meanings of colors of works of art in parallel with those of people. The results show that a new color image space HRU is developed, and the relativity between this space and the CIEL*a*b* color space is also discussed. And, a good relationship between the HRU color image space and the CIEL*a*b* color space can be found. This may be of great advantage to the new color image space HRU in predicting the color image for single color based on the color space CIEL*a*b*. © 2009 Wiley Periodicals, Inc. Col Res Appl, 34, 452–457, 2009     

Perception of Visual Speed While Moving.

During self-motion, the world normally appears stationary. In part, this may be due to reductions in visual motion signals during self-motion. In 8 experiments, the authors used magnitude estimation to characterize changes in visual speed perception as a result of biomechanical self-motion alone (treadmill walking), physical translation alone (passive transport), and both biomechanical self-motion and physical translation together (walking). Their results show that each factor alone produces subtractive reductions in visual speed but that subtraction is greatest with both factors together, approximating the sum of the 2 separately. The similarity of results for biomechanical and passive self-motion support H. B. Barlow's (1990) inhibition theory of sensory correlation as a mechanism for implementing H. Wallach's (1987) compensation for self-motion. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

分谐波混频在数字微波直接变频调制/解调器中的应用

在微波/毫米波频段,高电平载波泄漏是制约数字直接变频调制器(如QPSK)性能、产生调制矢量误差的一个重要因素。在直接变频接收方式中,二阶交调失真(IM2)及本振噪声是制约动态范围的关键因素之一。偶次分谐波混频可有效地抑制载波泄漏、二次混频失真及本振噪声,是提高调制器精确度及直接解调器动态范围的有效技术。     

Ordinal Representation of Numeric Quantities by Brown Capuchin Monkeys (Cebus apella).

Using techniques established by E. M. Brannon and H. S. Terrace (2000) with rhesus macaques (Macaca mulatta), the authors tested the ability of brown capuchins (Cebus apella) to order arrays of items ranging in quantity from 1 to 9. Three monkeys were trained on a touch screen to select the quantities 1-4 in ascending order. The monkeys exhibited successful transfer of this ability to novel representations of the quantities 1-4 and to pairs of the novel quantities 5-9. Patterns of responding with respect to numeric distance and magnitude were similar to those seen in human subjects, suggesting the use of similar psychological processes. The capuchins demonstrated an ordinal representation of quantity equivalent to that shown in Old World monkeys. (PsycINFO Database Record (c) 2010 APA, all rights reserved)