利用提升小波的蛋白质相互作用特征提取

利用提升小波从蛋白质序列中提取出它们相互作用的频谱特征,经支持向量机训练学习后,用于预测蛋白质间的相互作用.模拟计算结果表明,在阳性数据和阴性数据平衡的前提下,利用提升小波获取的低维蛋白质相互作用特征向量可以得到较高预测精度.进一步阐述了不同物种的蛋白质相互作用网络有着不同特征,为了得到更准确的预测结果,需要利用不同的方法提取蛋白质相互作用的特征.     

一种新的自动调焦方法—离轴探测法

本文提出了的种新的自动调焦方法——离轴探测法,此法没用任何附加元件,结构简单、装调容易、线性度好、灵敏度高、调焦范围大、实用性强;介绍了此法的原理、理论计算结果及实验结果;给出了应用实例.     

C_0复杂度的改进及其在证券市场中的应用

系统地分析了Lemple-Ziv复杂性度量方法的应用过程中,将实际信号(时间序列)转变成符号序列的诸多方法中存在的一些问题,提出了更合理兼容法.该方法可以有效地刻划各种时间序列的复杂度.文章最后动态地分析了中国证券市场的复杂性.     

交通流非参数回归模型

交通流宏观参数流量、速度和占有率在交通工程和管理中具有非常重要的作用 ,对这三者关系的刻划反映了道路本身特性和交通流的规律。到目前为止 ,基本上采用线性或非线性的参数模型来描述 ,此类模型在应用中具有一定的局限性 ,并交通变量时间序列进行预测 ,数据拟合表明 ,选择适当的核函数或邻近数以及窗宽 ,可以达到比较满意的效果     

The electronic structure of SrTiO3 and some simple related oxides (MgO,Al2O3, SrO,TiO2)

The valence band density of states (VBDOS) of the insulating oxides SrTiO₃, TiO₂, SrO, MgO and Al₂O₃ obtained by X-ray photoelectron spectroscopy (XPS), are reported. Qualitatively, the VBDOS of these oxides are similar to one another. The XPS results are compared with results from soft X-ray emission spectroscopy (XES), ultraviolet photoemission spectroscopy (UPS), and theoretical calculations. There are some differences (in particular for TiO₂) between the XES and XPS results, which are probably due to matrix element effects enhancing different features of the VBDOS in the two techniques. The XPS results definitively establish the position of the O 2s level, which had been erroneously assigned in previous low-energy UPS measurements. Cluster-type calculations are demonstrated to give a reasonable representation of the VBDOS for the oxides.     

Glow discharge lamps as electron sources for electron impact excitation

It has been found possible to utilize the plasma in the discharge lamp of a conventional ultraviolet photoelectron spectrometer as an electron source f     

Rare-earth valence-state studies of the series RIn3 and RSn3 derived from quadrupole coupling constants

Time-differential perturbed angular correlation was applied to measure the quadrupole coupling constants of¹¹¹Cd (247 keV) at the In and Sn sites for rare-earth compounds of the series RIn₃ and RSn₃ that have the AuCu₃ structure. Definitive evidence was found for Yb and Eu having lower valence states relative to the assumed value of +3 for the other rare earths. Measurements at liquid helium temperatures and pressures to 18.5 kbar indicate that the room temperature valencies of CeSn₃, YbSn₃, and YbIn₃ have not changed.Work done under the auspices of the US Energy Research and Development Administration     

Synthesis and reactivity of sulfur and silyl substituted α-alkylidene-β-lactams

Synthetically valuable α-alkylidene-β-lactams are produced from the addition of chlorosulfonyl isocyanate to allenyl sulfides.     

Electron refraction and light polarization effects in angle-resolved photoemission spectra of Cu surfaces using 45 eV radiation

Angle-resolved photoemission spectra of the low Miller-index faces of copper were taken with polarized 45 eV light for both surface normal and off-normal photoemission orientations. They reveal that low-energy photoelectrons emitted off-normal to the surface are strongly refracted toward the surface at the solid-vacuum interface; measured refraction angles are significantly (5̃0%) larger than predicted from a simple plane wave model. Furthermore, the spectra are found to be very sensitive to the orientation of the polarization of the exciting radiation with respect to the crystalline axes and the sample surface. Spectral dependence on light polarization is discussed in terms of direct transition selection rules for primary Mahan cones, influence of directionality on matrix elements, and direct transition contributions to the spectra from surface photoemission.