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601.
The basic Fourier integral is studied in terms of the maximum possible harmonic amplitudes, whether or not they actually exist. Graphs that define the pulse shapes in terms of time period, pulse width, rise time, and amplitude are produced. Rectangular, trapezoidal, triangular, and two forms of exponential waveshapes are considered. The discrete harmonic concept is further developed to include the harmonic or noise content in a given bandwidth representative of single pulse and step-type functions. Experimental results that demonstrate the accuracy of actual measurements versus the predicted values are included. Very close correlation can be obtained on pulse shapes, which can be represented by the waveforms cited. Additional text that presents the derivation of the graphs and indicates how other waveshapes can similarly be rendered in graphical form is included. 相似文献
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604.
G. La Mura M. Berton S. Ciroi V. Cracco F. Di Mille P. Rafanelli 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2014
A strong X-ray emission is one of the defining signatures of nuclear activity in galaxies. According to the Unified Model for Active Galactic Nuclei (AGN), both the X-ray radiation and the prominent broad emission lines, characterizing the optical and UV spectra of Type 1 AGNs, are originated in the innermost regions of the sources, close to the Super Massive Black Holes (SMBH), which power the central engine. Since the emission is concentrated in a very compact region (with typical size r?0.1 pc) and it is not possible to obtain resolved images of the source, spectroscopic studies of this radiation represent the only valuable key to constrain the physical properties of matter and its structure in the center of active galaxies. Based on previous studies on the physics of the Broad Line Region (BLR) and on the X-ray spectra of broad (FWHMHβ ? 2000 km s−1) and narrow line (1000 km s−1 ?FWHMHβ ? 2000 km s−1) emitting objects, it has been observed that the kinematic and ionization properties of matter close to the SMBHs are related together, and, in particular, that ionization is higher in narrow line sources. Here we report on the study of the optical and X-ray spectra of a sample of Type 1 AGNs, selected from the Sloan Digital Sky Survey (SDSS) database, within an upper redshift limit of z=0.35, and detected at X-ray energies. We present analysis of the broad emission line fluxes and profiles, as well as the properties of the X-ray continuum and Fe Kα emission and we use these parameters to assess the consistency of our current AGN understanding. 相似文献
605.
Kaichang Di Wei Li Zongyu Yue Yiwei Sun Yiliang Liu 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2014
Craters are distinctive features on the surfaces of most terrestrial planets. Craters reveal the relative ages of surface units and provide information on surface geology. Extracting craters is one of the fundamental tasks in planetary research. Although many automated crater detection algorithms have been developed to exact craters from image or topographic data, most of them are applicable only in particular regions, and only a few can be widely used, especially in complex surface settings. In this study, we present a machine learning approach to crater detection from topographic data. This approach includes two steps: detecting square regions which contain one crater with the use of a boosting algorithm and delineating the rims of the crater in each square region by local terrain analysis and circular Hough transform. A new variant of Haar-like features (scaled Haar-like features) is proposed and combined with traditional Haar-like features and local binary pattern features to enhance the performance of the classifier. Experimental results with the use of Mars topographic data demonstrate that the developed approach can significantly decrease the false positive detection rate while maintaining a relatively high true positive detection rate even in challenging sites. 相似文献
606.
基于反正切马赫数分布的弥散反射激波中心体轴对称基准流场,设计了方转圆内收缩进气道,并对其进行风洞试验和数值仿真研究,获得该进气道非设计点(Ma=5.0和Ma=7.0)的工作特性和自起动特性。试验结果表明:进气道顶板压力分布具有反正切曲线特征,出口涡流区小且总体性能优良。Ma=5.0和Ma=7.0时出口总压恢复系数分别为0.647和0.443,对应的增压比分别为20.0和32.7。Ma=5.0时,进气道不但可以捕获约90%的自由来流,而且能够自起动(内收缩比高于Kantrowitz限制),下临界反压为64倍来流静压,对应的出口马赫数和总压恢复系数分别为1.32和0.409。上述结果表明,本文设计方法可以获得高性能的矩形转圆内收缩进气道。 相似文献
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叶片飞失极限状态下,航空发动机转子系统承受冲击载荷和大不平衡载荷,载荷通过转子结构传递到支承结构,对支承结构造成严重损伤。从安全性的角度看,需要对航空发动机轴承-支承结构在极限载荷下的承载能力进行有效的定量评估。提出一种新型缓冲阻尼支承结构,通过对支点刚度突降和高阻尼设计,实现在止推轴承支点处大幅降低横向冲击载荷的影响。建立考虑支承结构刚度突变和阻尼特性的转子系统动力学方程,并计算突加不平衡激励下,转子系统支点动载荷分布的变化规律。结果表明:通过优化设计支点刚度和阻尼参数,缓冲阻尼支承结构,能够有效降低突加不平衡激励下止推滚珠轴承的支点动载荷,提高支承结构的安全性。 相似文献
609.
针对受输入饱和约束的直接侧向力与气动力复合控制的导弹,研究其自动驾驶仪设计问题。导弹的执行机构分别是舵机和侧向脉冲发动机。舵机提供的是连续的控制量,而侧向脉冲发动机提供的是离散的控制量。首先采用最优控制方法设计连续的舵控制器。再对设计好舵控回路的新受控弹体,基于含有界干扰项离散饱和系统不变集分析方法进行直接侧向力控制器的设计。设计过程中,充分考虑了舵偏角的饱和非线性因素以及侧向脉冲发动机点火数取整产生的量化误差。最后,利用数值仿真验证了所提出控制方法的有效性。 相似文献
610.