基于可编程逻辑器件的I2C从机设计

介绍了一种基于可编程逻辑器件的I2C从机设计.以可编程逻辑器件MarchXO 256为核心,用VHDL编写了I2C进程,重点设计了读写状态机,并在输入后端加入D触发器,以提高从机在工业环境中的抗干扰能力.该设计提高了主机扩展I/O口的灵活性和可配置性.     

Solid-state synthesis of amorphous iron(III) phosphate at room temperature and its absorption properties for Hg(II) and Ag(I) ions

Amorphous iron(III) phosphate has been synthesized by solid-state reaction at room temperature and was characterized by several methods. The non-crystalline sample displayed the particle size within the range of 100-200 nm, and it had a strong fluorescence emission peak centered at 306.6 nm. Moreover, its absorption properties for Hg(II) and Ag(I) heavy metal ions have been investigated. The experimental research results revealed that its excellent absorption capacity for Hg(II) and Ag(I) could reach to 1.831 mmol/g and 1.354 mmol/g, respectively, at pH = 5.98 and the absorption time t = 6 h. The absorption properties for Hg(II) were usually stronger that those for Ag(I).     

Dirty RF: A New Paradigm

The implementation challenge for new low-cost low-power wireless modem transceivers has continuously been growing with increased modem performance, bandwidth, and carrier frequency. Up to now we have been designing transceivers in a way that we are able to keep the analog (RF) problem domain widely separated from the digital signal processing design. However, with today’s deep sub-micron technology, analog impairments – “dirt effects” – are reaching a new problem level which requires a paradigm shift in the design of transceivers. Examples of these impairments are phase noise, non-linearities, I/Q imbalance, ADC impairments, etc. In the world of “Dirty RF” we assume to design digital signal processing such that we can cope with a new level of impairments, allowing lee-way in the requirements set on future RF sub-systems. This paper gives an overview of the topic and presents analytical evaluations of the performance losses due to RF impairments as well as algorithms that allow to live with imperfect RF by compensating the resulting error effects using digital baseband processing.     

格式输出函数printf的执行流程分析

格式输出函数printf是C语言中使用频度最高的输出函数之一,由于其使用方式灵活,在实际应用中经常出现一些莫名的错误。依据C语言中可变参数函数的执行流程,给出了printf函数的执行过程,分析了一些错误产生的原因,对于正确使用printf函数具有一定的指导意义。     

一种中频数字化正交解调算法分析

对雷达中频接收如何解调出具有回波信号中的同相（I）、正交（Q）分量做了分析,到目前为止,获取数字I/Q分量的算法很多,常见的有低通滤波法和Hilbert法（希尔伯特法）等,现详细的阐述了低通滤波法及其改进实现方法,并给出仿真结果。     

基于残差正交判别的UPF容错算法

从改进提议分布的成片野值容错能力入手，提出了基于残差正交判别的UPF容错滤波算法，该算法将残差正交判别法UKF的野值自适应性和粒子滤波的“适者生存性”有机地结合起来．通过非线性状态估计的实验，证实了这种新的自适应粒子滤波对成片野值处理的有效性，     

绿色电脑

随着电脑的普及,日常生活中越来越多的接触电脑,对电脑的环保要求越来越高,同时人们也在不断地关注使用电脑过程中的健康问题.     

A Survey of Haptic Rendering Techniques

Computer Graphics technologies have developed considerably over the past decades. Realistic virtual environments can be produced incorporating complex geometry for graphical objects and utilising hardware acceleration for per pixel effects. To enhance these environments, in terms of the immersive experience perceived by users, the human's sense of touch, or haptic system, can be exploited. To this end haptic feedback devices capable of exerting forces on the user are incorporated. The process of determining a reaction force for a given position of the haptic device is known as haptic rendering. For over a decade users have been able to interact with a virtual environment with a haptic device. This paper focuses on the haptic rendering algorithms which have been developed to compute forces as users manipulate the haptic device in the virtual environment.     

Volume Preservation of Multiresolution Meshes

Geometric constraints have proved to be efficient for enhancing the realism of shape animation. The present paper addresses the computation and the preservation of the volume enclosed by multiresolution meshes. A wavelet based representation allows the mesh to be handled at any level of resolution. The key contribution is the calculation of the volume as a trilinear form with respect to the multiresolution coefficients. Efficiency is reached thanks to the pre-processing of a sparse 3D data structure involving the transposition of the filters while represented as a lifting scheme. A versatile and interactive method for preserving the volume during a deformation process is then proposed. It is based on a quadratic minimization subject to a linearization of the volume constraint. A closed form of the solution is derived.