NACA-65-0012振荡机翼远场气动噪声的预测研究

基于声波发射时间编写了远场噪声预测的Kirchhoff积分程序,并通过静止介质中的静止点声源与匀速运动点声源的远场噪声预测验证了积分程序的可靠性.结果表明,该Kirchhoff积分程序可以获得远场噪声的有效声压和声场指向性分布.在来流马赫数为0.5且不计黏性的条件下,结合非定常流场计算程序与Kirchhoff积分程序对二维孤立振荡叶型诱发的远场噪声进行数值预测,获得了远场观察者的瞬时声压和声场指向性分布.研究表明,在30°,120°,210°和315°方向声压有效值较大.     

苏区的反“围剿”战争与人民战争思想的形成

南昌、秋收、广州三大起义失败后,中国共产党开始将革命的重心逐渐由城市转向广大的农村。这一转移,也是共产党选择以＂面＂打＂点＂战略的开始。为了贯彻以＂面＂打＂点＂这一战略,共产党在各苏区进行了广泛的动员与组织,并围绕着反＂围剿＂战争的需要开展其他战争准备工作,从而使人民战争的思想在反＂围剿＂战争中得到不断的发展。     

基于平稳Contourlet变换的极化SAR图像融合

提出一种新颖而有效的基于平稳Contourlet变换的极化SAR图像融合算法。平稳Contourlet变换是一种具有几何信息的灵活多尺度、多方向和平移不变性的图像分解变换,与小波变换相比,对图像分析很重要的沿曲面任意方向反映的细节更容易调整。采用平稳Contourlet变换对多个单极化强度图像进行分解,对于低频系数和方向高频系数采用最优加权算法实现极化图像的融合处理。实验结果表明,该算法与PWF算法相比在保留原始图像边缘和纹理信息同时,可以有效地抑制相干斑噪声的影响,取得较好的融合视觉效果。     

基于改进广义S变换的井筒波压制

VSP资料中经常出现能量比较强的井筒波,目前其压制方法主要利用中值滤波和F-K滤波。由于中值滤波存在统计效应,而F-K变换经常存在空间假频,都很难取得理想效果。基于井筒波和有效信号的时频差异,提出利用改进的广义S变换(采用宽度可变的高斯窗函数,其时窗宽度随频率呈正比,在低频段时窗较窄,获得较高的时间分辨率;高频段时窗较宽,故可获得很高的频率分辨率)对井筒波进行分离和压制。理论推导和实际数据计算表明,基于吸收改进的广义S变换的井筒波压制明显突出了有效信号,提高了信噪比。      

Smoothed detrended fluctuation analysis

ABSTRACT

The method of detrended fluctuation analysis (DFA) is useful in revealing the extent of long-range dependence, it has successfully been applied to different fields of interest. In this paper we proposed a smoothed detrended fluctuation analysis method based on the principle of wavelet shrinkage. The procedure is illustrated and compared with the DFA method by Monte Carlo simulations on fractional Gaussian noise models.     

W波段小型化锁相源

根据基波锁相、谐波提取的思想,采用双环数字锁相方式,实现了Ｗ 波段二次谐波耿氏锁相振荡器;分析了混频锁相环中输出端口与中频端口相位抖动的关系,指出了从自身中频端口测试相噪的局限性。该锁相源频率为９３ ＧＨｚ,射频偏离载波５０ ＫＨｚ 时,相噪为－ ７０ ｄＢｃ／Ｈｚ ,输出功率大于１０ ｍ Ｗ,可用于本振等小功率场合     

Psychometric Evaluation of the Affect Regulation Checklist: Clinical and Community Samples,Parent-Reports and Youth Self-Reports

The Affect Regulation Checklist (ARC) was designed to capture affect dysregulation, suppression, and reflection. Importantly, affect dysregulation has been established as a transdiagnostic mechanism underpinning many forms of psychopathology. We tested the ARC psychometric properties across clinical and community samples and through both parent-report and youth self-report information. Clinical sample: Participants included parents (n = 814; M_age = 43.86) and their child (n = 608; M_age = 13.98). Community sample: Participants included independent samples of parents (n = 578; M_age = 45.12) and youth (n = 809; M_age = 15.67). Exploratory structural equation modeling supported a three-factor structure across samples and informants. Dysregulation was positively associated with all forms of psychopathology. In general, suppression was positively associated with many forms of psychopathology, and reflection was negatively associated with externalizing problems and positively associated with internalizing problems.     

民国时期云南盐商、私盐与辑私关系探析

民国时期,云南存在着新、旧两类争利的盐商。这一时期云南省内私盐更是盛行,究其成因当与盐商的牟取暴利有着重要的内在联系。辑私虽一直被政府所重视,然在官商勾结、商人与官兵勾结、商人与灶民的勾结下,名辑实保现象严重。     

基于背景声音的阅读认知过程的探索性研究

背景声音刺激对个体认知过程会产生影响。以英语（二语）、荷兰语（外语）和汉语（母语）作为背景声音，采用自定步速逐词阅读的移动窗口阅读范式收集阅读过程中单词的反应时。反应时的常规均值分析结果表明：背景声音对阅读过程的干扰发生在语音层面；背景声音条件下，在加工目标语言的过程中，非目标语言会被激活。十位被试反应时数据的频谱分析结果表明：粉红噪音存在于三种背景声音场景中、英阅读的每个过程中，不同背景声音条件下的中英文阅读过程本质上具有相似性。     

Noise

This essay develops a cultural materialist theory of listening through a historical ethnography of Gibraltarian men's contradictory sensitivity to the ‘noise’ of mass media and desensitization to the industrial soundscape of the state. I argue that this contradiction can be historicized through close attention to the social antagonisms embedded in the history of noise ordinances, and the ways in which British colonial officials structured an idealized form of masculinity premised on the sonic relationships between bodies and technologies. Gibraltarian men reproduce this masculine disposition, and through it colonial hierarchies, in the seemingly banal practice of listening to mass media, and ignoring the soundscape of the neoliberal, colonial state.