信号的多项式趋势项研究和MATLAB实现

通过对确定性信号和随机信号加入线性和非线性趋势项,并用最小二乘法和小波法分别进行消除趋势项处理,比较消趋前后信号和原始信号的均值、方差和相关系数等参考量,提出不同信号类型要用不同消除趋势项的方法,才能达到理想的消趋效果。     

热带连轧生产线上信息处理系统

热轧带钢厂的信息处理系统是利用现场实测数据建模的基础，精轧机组信号由传感器采集后，需进行处理，主要短次数据处理，速度折算、温度趋势项提取；低通滤波和高通滤波；对低通滤波和高通滤波后的信号分别进行频谱分析，得到特征参数并进行模糊处理。     

排土场滑移失稳次声信号特征研究

为了探究排土场滑移失稳次声信号特征，开展室内模型试验模拟排土场滑移失稳过程，以次声波仪采集试验中的次声波信号，用EEMD处理信号并分析次声波信号的幅值、能量和b值的时变特征。结果表明:①EEMD方法可以滤掉信号的高频部分和趋势项，有效提取排土场滑移失稳时产生的特征信号；②通过各IMF分量的时域波形图对比发现，排土场滑移失稳时产生的特征次声信号的频率范围为0~3 Hz；③排土场发生整体滑移时，信号的幅值最大，信号能量出现跳跃式增加的时刻恰恰是排土场发生整体滑移的时刻，b值的总体趋势是在不断地下降并在排土场发生整体滑移时达到最小值。次声波信号上述特征可以用于排土场滑移失稳的监测预警。      

微分处理方法在漏磁检测信号分析中的应用研究

提出用微分方法处理含有趋势项和幅值相等的内外伤漏磁检测信号,对微分算法及其选取进行了深入探讨。试验结果表明,经过微分处理后,内外伤缺陷区别明显,内外伤信号的幅值与直接提取原始信号内外伤缺陷的幅值相比差别明显,分辨率大大提高。     

高炉煤气干法布袋除尘灰位检测探究与工程设计

高炉煤气干法布袋除尘灰位检测的设计是该系统仪控设计工作的一个要点。着重从工程设计角度,分析研究了现有工程中灰位检测方法存在的问题及部分认识上的误区,以及投产项目中干法布袋除尘系统中相关仪表信号历史趋势,提出了利用高、低灰位温度与筒体温度的梯度差异实现对煤气灰灰位检测,并融合灰罐压力信号作为除尘器自动输灰停止的判别信号,达到经济有效地检测干法除尘灰位的目的。为了达到该目的,文中给出了仪表选型、安装接口设计、PLC程序设计等具体工程设计细节。工程试验表明,该方法原理简单、效果显著。     

计算机技术在机械设备故障监测与诊断上的应用

分析了机械设备维护的现状,推崇现代化的设备维护方式,利用计算机技术和捱劝分析技术对重要设备进行在线监测,根据设备的实际状态来进行维护。利用传感器和计算机采集原始振动信号,进行趋势分析和精密人析来判断设备状态,对设备进行科学地维护,及时诊断出齿轮偏心,严重磨损及轴线不平行等故障。     

1422热轧飞剪剪切控制的可靠性攻关——剪切HMD信号的保护

剪切HMD的可靠性是保证飞剪剪切精度并防止误切的前提。对1422飞剪优化剪切系统BIZ防误切保护的原理和存在的缺陷进行了分析,提出了增强BIZ信号可靠性的方法。分析了HMD2048的局限性,提出了通过利用多种检测器信号对HMD2048信号进行直接保护的方法,可有效提高剪切HMD信号的可靠性。     

全光纤安防系统模式识别混合编程的实现

介绍了宽域全光纤监控预警系统及光纤扰动信号模式识别算法.利用小波包分解对信号进行分解与重构,并提取各频段内信号分量能量谱作为特征向量;应用综合考虑观测数据和确定性先验知识的BVC-RBF神经网络实现信号分类,提高了网络的泛化能力.利用Matlab引擎、动态链接库(DLL)、组件对象模型(COM)3种混合编程方法将Matlab开发的算法程序集成到VC编写的用户操作平台中.使用文本文件存取网络数据,克服了Matlab无法编译神经网络工具箱函数的缺陷,并从操作复杂度、执行时间、内存消耗等方面对3种方式进行对比,最终选定动态链接库作为系统应用方案.     

ABB变频器系统调试中信号接地线的作用

本文介绍的是ABB变频器ACSS00中信号接地线在污水处理厂鼓风曝气设备中的影响,对变频器在变频传动系统中因电磁干扰而引起的故障及引起故障发生的原理进行了分析,并对利用信号接地线解决问题的过程进行了描述。     

基于小波分析和自相关计算的非接触式生理信号检测

采用调频连续波（Frequency modulated continuous wave, FMCW）雷达实现非接触式生理信号检测,并提出了基于小波分析和自相关计算（Wavelet analysis and autocorrelation computation, WAAC）的检测方法。首先,毫米波FMCW雷达发射电磁波信号,并接收来自身体的反射信号。然后,通过信号预处理从中频信号中提取包含呼吸和心跳的相位信息,消除直流偏置并完成相位解缠。最后,基于小波包分解（Wavelet packet decomposition, WPD）从原始信号中得到心跳和呼吸信号,利用自相关计算减小杂波对心跳信号的影响,进而提取高精度的心率参数。应用FMCW雷达对10名受试者进行实验测试,结果表明本文方法得到的呼吸和心率的平均绝对误差率平均值分别小于1.65%和1.83%。      

Stimulation by DIF causes an increase of intracellular Ca2+ in Dictyostelium discoideum

Using fluorescence-activated cell sorting (FACS), we have studied the effect of the differentiation-inducing factor (DIF) on cellular Ca2+ in Dictyostelium discoideum. We have shown previously that freshly starved or postaggregation amoebae are heterogenous with respect to the amounts of cellular Ca2+ that they contain; the L or "low Ca2+" class exhibits a prespore tendency and the H or "high Ca2+" class exhibits a prestalk tendency. Upon adding DIF, within 2 min there is an approximately twofold increase in the relative fraction of amoebae falling in the H class. A major part of the increase is caused by Ca2+ influx from the extracellular medium. Therefore a rise in the level of cellular Ca2+ is an early step in the signal transduction pathway following stimulation by DIF. Also, in parallel with the cellular heterogeneity in respect of Ca2+ content, there is a heterogeneity in the response to DIF, which appears to be restricted to L cells.     

提高轧辊偏心信号频谱分析精度的方法

针对目前冷轧生产中因轧辊偏心引起带材厚度波动的问题，提出了一种提高轧辊偏心信号频谱分析精度的方法。该方法综合应用伪点剔除技术、抗混滤波技术和平滑趋势技术对原始轧辊偏心信号进行预处理，再使用改进的快速傅立叶变换算法对预处理后的信号进行分析，其频谱分辨率明显提高。现场测试表明，经该方法分析ABB压头采集到的轧辊偏心信号，其频谱分辨精度明显高于以往用快速傅立叶变换算法的分辨精度，从而可以快速准确地诊断轧辊偏心所造成的影响。     

Sex differences in empathy and related behaviors.

According to the prevailing cultural stereotype as well as various psychological theories, empathy (the vicarious affective response to another person's feelings) is more prevalent in females than in males. A review of the research indicates that females do indeed appear to be more empathic than males. They do not appear to be more adept at assessing another person's affective, cognitive, or spatial perspective, however. There is also evidence to suggest that empathy in females may be part of a prosocial affective orientation that includes the tendency to experience guilt over harming others, but it does not, at least in early childhood, appear to be part of a larger interpersonal sensitivity that includes egocentric concerns about the feelings of others toward the self. It is suggested that females may have greater tendency to imagine themelves in the other's place, whereas males have more of a set toward instrumental ameliorative action. (71 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Genetics, the Big Five, and the tendency to be self-employed.

We applied multivariate genetics techniques to a sample of 3,412 monozygotic and dizygotic twins from the United Kingdom and 1,300 monozygotic and dizygotic twins from the United States to examine whether genetic factors account for part of the covariance between the Big Five personality characteristics and the tendency to be an entrepreneur. We found that common genes influenced the phenotypic correlations between only Extraversion and Openness to Experience and the tendency to be an entrepreneur. Although the phenotypic correlations between the personality characteristics and the tendency to be an entrepreneur were small in size, genetic factors accounted for most of them. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The sorting route of cytochrome b2 branches from the general mitochondrial import pathway at the preprotein translocase of the inner membrane

Cytochrome b2 is synthesized in the cytosol with a bipartite presequence. The first part of the presequence targets the protein to mitochondria and mediates translocation into the mitochondrial matrix compartment; the second part contains the sorting signal that is required for delivery of the protein to the intermembrane space. The localization of the structures that recognize the sorting signal is unclear. Here we show that upon import in vivo, the sorting signal of cytochrome b2 causes an early divergence from the general matrix import pathway and thereby prevents translocation of a folded C-terminal domain into mitochondria. By co-immunoprecipitations we find that translocation intermediates of cytochrome b2 are associated with Tim23, a component of the inner membrane protein import machinery. Cytochrome b2 constructs with an alteration in the sorting signal are mistargeted to the matrix of wild-type mitochondria. In mitochondria containing a mutant form of Tim23, however, the translocation of the altered sorting signal across the inner membrane is inhibited, and cytochrome b2 is correctly sorted to the intermembrane space. We suggest that the sorting signal of cytochrome b2 is recognized within the inner membrane in close vicinity to Tim23.     

MRI of the pituitary adenomas with reference to the hormonal activity

Many studies in Magnetic Resonance Imaging (MRI) of pituitary adenomas are already performed. However, few reports exist about MRI findings of pituitary adenomas with reference to the hormonal activity, therefore, we evaluated this problem on the viewpoint of the signal intensity in MRI and pathological features. Fifteen patients with growth hormone producing adenoma (GH-group), 6 patients with prolactin producing adenoma (PRL-group), 15 patients with endocrinologically non-functioning adenoma (Null-group) and 9 cases with normal pituitary gland (normal control group) were examined. Signal intensity values in adenoma (or anterior lobe in normal control group) and in pons as standard value were measured in each cases, then their rates were calculated as signal intensity ratio (SIR). In 24 cases (14 in GH-group, 3 in PRL-group, 7 in Null-group), cellular density were examined with surgically resected specimens. In the T1-weighted images (T1 WIs), PRL-group and Null-group presented more hypointense tendency than normal control group. In the T2-weighted images (T2 WIs), only Null-group presented more hyperintense tendency than other groups. But significant correlation was not observed between SIR and cellular density.     

Choice and self-expression: A cultural analysis of variety-seeking.

Three studies examined whether the tendency to seek variety in choices depends in part on cultural assumptions of choice and uniqueness. Study 1 showed that people from different cultures where different assumptions of choice and uniqueness dominate show different levels of variety in their choice rule use. Study 2 primed participants with magazine ads highlighting different representations of uniqueness dominant in individualist versus collectivist cultures to show the influence of cultural meanings of uniqueness on the variety-seeking tendency. Study 3 manipulated the motivation to display to demonstrate that variety-seeking in the United States partly hinges on cultural meanings of as self-expression. Variety-seeking in choice rule use was eliminated when participants had the chance to self-express through choice listing. The research illustrates the role of cultural assumptions in the variety-seeking tendency. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

电炉导电横臂技术的发展趋势

对电炉关键部件—导电横臂的三种类型作了对比分析，并指出全铝合金导电横臂这一新型技术，将是国内外电炉导电横臂技术的最新发展趋势。     

频分多址盲炮检测技术与系统在深孔爆破中的应用研究

针对深孔爆破中盲炮难以检测和识别的问题,开发了基于电磁波传播理论的深孔爆破盲炮频分多址检测技术与系统,并对检测系统的性能进行了试验研究。结果表明：在岩土体中传播的电磁信号发射频率越低其穿透能力越强,传播距离越远;在同等收发水平距离条件下,电磁信号幅值随着盲炮埋深的增加而减小,同时随着地下信号发生器发射频率的增大而减小;而且随着频率的增大,衰减趋势更明显。该盲炮检测系统良好的频响范围是2 012~5 025 Hz,对埋深≤40 m和收发水平距离≤30 m的深孔爆破盲炮,具有良好的检测识别能力。频分多址盲炮检测技术与系统可满足深孔爆破盲炮检测的要求。     

The presuicidal syndrome

The Presuicidal Syndrome, first described in 1958, relates to that specific psychic state of mind that leads to suicidal acts. It is an alarm signal indicating a tendency to suicide. The Presuicidal Syndrome has three principal components: constriction; inhibited aggression turned toward the self; and suicidal fantasies. The clinical details of these components are explicated. It is proposed that the Presuicidal Syndrome provides a basis for better judgment of the danger of suicide, makes more focused suicide prevention possible, and is an aid in the disclosure of those factors in society that often lead to suicide.