PSD对称性检测在车牌和人脸识别中的应用探索

车牌和人脸识别是实现现代智能化的重要步骤,对车牌和人脸的识别具有重要的意义。对称性是车牌和人脸的重要特征,本文针对PSD对称性检测算法提取的对称性特征,探索了这些特征对车牌和人脸识别的重要作用。     

Symmetry building Monte Carlo-based crystal structure prediction

Methods are presented that allow for the automatic increase and preservation of symmetry during global optimization of crystal structures. This systematic building of symmetry allows for its incorporation into structure prediction simulations even when the space group information is not known a priori. It is shown that simulations that build and maintain symmetry converge much more rapidly to ground state crystal structures than when symmetry is ignored, allowing for the treatment of unit cells much larger than would otherwise be possible, especially when beginning from the P1 space group.     

Symmetry energy dependence of the pygmy and giant dipole resonances in an isospin dependent quantum molecular dynamics model

Isospin-dependent Quantum Molecular Dynamics model (IQMD) has been applied to investigate the Pygmy Dipole Resonance (PDR) and Giant Dipole Resonance (GDR) in Ni isotopes by Coulomb excitation. By Gaussian fitting to the photon emission spectra, the peak energies and strengths of PDR and GDR are extracted. Their sensitivities to impact parameter, incident energy and the symmetry energy are discussed. By the comparison of energy-weighted sum rule (EWSR) with the data and other calculations for 68 Ni, the parameters of density-dependence of symmetry energy in the IQMD are constrained. In addition, the N/Z dependence of PDR and GDR parameters of Ni isotopes are investigated, and the results that the EWSR increases linearly with the N/Z are obtained.     

3D load cell for measure force in a bicycle crank

This paper presents a new 3D instrumented crank prototype for characterization, analysis and validation in race bikes. System characterization throws a maximum linearity error of 0.30% for parallel projection transfer function. Uncertainty values for Monte Carlo method resulted smaller than classic method computations. An experiment was designed with four controlled factors where data obtained fallowed normal distribution. Symmetry and Cadence statistics (RMS, Mean and Variance) were used in ANOVA, showing that Symmetry on outdoor Environment was higher than indoor tests. Heaviest Subject presented greater symmetry, and the Gears increasing prove symmetry rising. The lightest Subject developed higher Cadence values, as also was developed on Indoor Environment. Greater speed was achieved for bigger gears. System variability was observed in ANOVA by Variance variable behavior. Routine programmed obtained useful graphs for sport training: Effective force, Torque and Power output symmetry analysis and Force 3D projection decomposition in crank arm analysis were done.     

旋转式预邦定机图像对位方案的改进

图像对位是预压邦定机重要的组成部分,好的图像对位方法可以提高产品的合格率及工作效率.介绍了旋转式预邦定机图像对位控制方案的硬件与软件的设计及原理,阐述了旋转式预邦定机正反面对位在同一台设备上的实现及在工作台X向平移玻璃基板监视器上图像移动的方向一致.     

广州新图书馆 为功能服务的造型

广州新图书馆是广州近期新建的四个文化设施中最后建成的一个。"日建设计"通过形式上轴线对称的处理与外立面材质的统一将其与其他建筑相融合。该建筑具有如下特征:外观设计通过外装石材表现书本堆积的形象,隐喻图书的"文化地层"般的历史含义,并通过叠层石材凹槽处开口满足图书防晒的需求;引用商业空间布局手法,创造面向市民开放的多层立体公开阅览区,并通过中间的共享大厅提高整体空间识别性,方便垂直交通;通过共享大厅顶部天窗获得充足的采光和自然通风效果,实现绿色建筑目标。"日建设计"希望借此树立在中国的建筑设计新形象,探索为建筑功能服务造型的可能。     

Effects of Near-Fault Ground Shaking on Sliding Systems

A numerical study is presented for a rigid block supported through a frictional contact surface on a horizontal or an inclined plane, and subjected to horizontal or slope-parallel excitation. The latter is described with idealized pulses and near-fault seismic records strongly influenced by forward-directivity or fling-step effects (from Northridge, Kobe, Kocaeli, Chi-Chi, Aegion). In addition to the well known dependence of the resulting block slippage on variables such as the peak base velocity, the peak base acceleration, and the critical acceleration ratio, our study has consistently and repeatedly revealed a profound sensitivity of both maximum and residual slippage: (1) on the sequence and even the details of the pulses contained in the excitation and (2) on the direction (+ or ?) in which the shaking of the inclined plane is imposed. By contrast, the slippage is not affected to any measurable degree by even the strongest vertical components of the accelerograms. Moreover, the slippage from a specific record may often be poorly correlated with its Arias intensity. These findings may contradict some of the prevailing beliefs that emanate from statistical correlation studies. The upper-bound sliding displacements from near-fault excitations may substantially exceed the values obtained from some of the currently available design charts.     

Symmetric and symplectic exponentially fitted Runge–Kutta–Nyström methods for Hamiltonian problems

The construction of symmetric and symplectic exponentially fitted modified Runge–Kutta–Nyström (SSEFRKN) methods is considered. Based on the symmetry, symplecticity, and exponentially fitted conditions, new explicit modified RKN integrators with FSAL property are obtained. The new integrators integrate exactly differential systems whose solutions can be expressed as linear combinations of functions from the set { exp(± iωt)}, ω > 0, i² = −1, or equivalently from the set { cos(ωt), sin(ωt)}. The phase properties of the new integrators are examined and their periodicity regions are obtained. Numerical experiments are accompanied to show the high efficiency and competence of the new SSEFRKN methods compared with some highly efficient nonsymmetric symplecti EFRKN methods in the literature.     

等高双抱杆对抬滑移法

等高双抱杆对抬滑移法付桂生（江西第二化肥厂）关键词等高双抱杆吊装填料塔符号说明Ｇ———每根抱杆重量，Ｇ＝６ｔ；Ｋ———动载荷系数，取Ｋ＝１．１；Ｋ′———不均衡系数，取Ｋ′＝１１；Ｋ１———滑车组机械利益系数；Ｋ２———安全系数，Ｋ２＝３５；Ｌ...     

Kohn anomaly in graphene

Symmetry based analysis of the Kohn anomaly is performed. Kohn phonon frequencies and displacements are calculated by force constant method. It is shown that Kohn phonon vibrations cause electronic band gap opening.