Flat connections and Wigner-Yanase-Dyson metrics

On the manifold of positive definite matrices, we investigate the existence of pairs of flat affine connections, dual with respect to a given monotone metric. The connections are defined either using the α-embeddings and finding the duals with respect to the metric, or by means of contrast functionals. We show that in both cases, the existence of such a pair of connections is possible if and only if the metric is given by the Wigner-Yanase-Dyson skew information.     

AD976及其在三分量智能检波器中的应用

介绍了快速、低功耗模数转换器件AD976的主要特点、引脚功能及转换模式 ,给出了AD976在三分量智能检波器中的应用实例     

On the geometry of para-Kählerian Cartan spaces

We consider Cartan Spaces with almost product structure. We prove that, in such spaces, there exist para-Kählerian structures and establish criteria for semisymmetric and Ricci-semisymmetric spaces.     

基于单特显点调频连续波阵列SAR系统幅相误差校正方法研究

调频连续波(Frequency Modulated Continuous Wave,FMCW)阵列合成孔径雷达系统(SAR)将FMCW体制与阵列SAR技术相结合,在军事和民用领域都有着广泛的应用前景。但是,实际调频连续波阵列SAR系统中不可避免地存在调频率非线性误差和多通道幅相误差问题,如不校正会造成雷达图像质量降级。该文建立考虑上述误差的信号模型,并针对该模型提出一种基于单特显点回波数据的误差校正方案和成像处理流程,最后通过仿真和实际数据处理验证了所提方法的有效性。     

基于单片机的多路数据采集系统设计

数据采集系统在石油化工行业广泛应用,文章给出一种ATmega16单片机控制的多路数据采集系统的设计方案。单片机将现场采集的多路模拟信号转换为数字量,通过LCD12864将其在现场显示,通过AT24C64将数据进行存储,现场采集的信号还可以通过485总线传输至上位机。     

TIRAMISU: A novel approach to content representation and key management for seamless super-distribution of protected media

Media delivery over heterogeneous networks requires both flexible representation and robust protection of content. This paper provides details on the framework for audiovisual content creation, delivery, consumption and protection as conceived within the IST project The Innovative Rights and Access Management Interplatform SolUtion. The proposed framework is based on the emerging MPEG-21 standard for multimedia content delivery and consumption and at the same time it complements it in several aspects, most notably by fully specifying a digital rights management (DRM) scheme. Central to the described framework is a novel key management system, relying on smartcards, which addresses many issues that previously blocked wider adoption of DRM: obtrusiveness of the DRM technology perceived by the end-user, flexibility in licence formulation and adequate level of trust as requested by content owners.     

A Noncommutative Generalization of the Free-Field Yang–Mills Equations

The purpose of this paper is to propose a noncommutative generalization of a gauge connection and the free-field Yang–Mills equations. The paper draws upon the techniques proposed by Heller et al. for the noncommutative generalization of the Einstein field equations.     

A Ring-Theorist's Description of Fedosov Quantization

We present a formal, algebraic treatment of Fedosov's argument that the coordinate algebra of a symplectic manifold has a deformation quantization. His remarkable formulas are established in the context of affine symplectic algebras.     

信道化接收机中微波放大技术的研究

介绍了信道化接收机实现的方案和工作原理，并对其接收系统中重要部件——宽频带放大器做了重点介绍，针对低噪声和宽频带2个主要指标，采用平衡式放大器进行设计，最后给出了仿真结果。