X射线相衬成像图像采集系统的远程控制传输设计

为了满足X射线相衬成像技术对图像采集装置的大面积和高分辨率的特殊要求,提出了一种基于ARM9和FPGA的远程图像采集控制传输系统的设计方法。系统由LUPA4000CMOS图像传感器、ARM9、DM9000A、FPGA、DDR2 SDRAM等器件组成。采用FPGA和DDR2技术,可以对大数据量的图像数据进行实时缓存,解决了高分辨率、大数据量图像数据实时存储和获取的关键问题。采用以太网远程控制传输的方法,能有效避免X射线辐射。实验结果表明,该系统可以实时准确地获取大面积、高精度图像数据。

蓝牙A/V Profiles的功用和发展前景

由松下、东芝、索尼以及飞利浦等8家公司组成的“BIuetooth Audio/Video(A/V)Working Group”公布了将Bluetooth作为传输媒体传输高品质的动态图像数据以及音乐数据的扩展标准“A/V Profiles”。A/V Profiles作为视听传输标准,共有5个Profiles。它包括:(1)通用A/V分配应用协议(Generic Audio/Video Distribution Profile);(2)A/V分配传输协议(Audio/Video Distribution Transport Protocol);(3)A/V控制传输协议(Audio/Video Control Transport Protocol);(4)高级语音分配应用协议(Advanced Audio Distribution Profile);(5)A/V远程控制传输协议(Audio/Video Remote Control Transport Protocol)。下面将简单介绍这五个A/V Profiles的功用。

Quantum Teleportation via Completely Anisotropic Heisenberg Chain in Inhomogeneous Magnetic Field

The quantum teleportation with the entangled thermai state is investigated based on the completely anisotropie Heisenberg chain in the presence of the externally inhomogeneous magnetic field. The effects of the anisotropy and magnetic field for the quantum fidelity are studied in detail The zero temperature limit and the features of the nonzero temperature for this nonclassical fdelity are obtained. We find that the quantum teleportation demands more stringent conditions than the therma/ entanglement of the resource by investigating the threshold temperature of the thermal concurrence and the criticai temperature of the maximai teleportation fidelity. The useful quantum teleportation should avoid the point of the phase transition of the system and the anisotropy of the chain and the external magnetic field can control the applicability of the resource in the quantum teleportation.