AL700在视频切换中的应用

本文介绍了AVERLOGIC公司彩色视频分割控制芯片AL700的内部结构和主要性能，给出了一个以该芯片为切换元件的视频切换器的电路设计。在本设计中，单片机通过对AL700寄存器的编程达到对视频图像的显示性质和通道切换的控制，电路硬件简单，软件实现容易，可以应用在监控系统、会议电视、可视电话等需要视频切换的场合。     

基于齿轮测量中心数值随动系统的设计

为了实现齿轮测量中心对未知轮廓齿轮测量的需求,设计了基于齿轮测量中心的数值随动系统,使用测头数值信号作为输入,控制输出脉冲频率,从而对随动轴的速度进行调节,实现电机的跟随运动.设计中选用C8051F310单片机为核心,使用AD9850芯片做为脉冲信号发生模块搭建了硬件系统,使得测头数值和输出脉冲频率成线性比例关系,并给出了板卡驱动程序的设计.     

TM310模的同轴谐振腔与波导孔耦合及场分布研究

该文研究了采用TM310高阶模同轴谐振腔与波导孔耦合构成的多注速调管输出回路。从理论上阐述了调节该输出腔的外观品质因数的原理和方法,并利用三维电磁场软件CST进行了模拟验证,得到TM310模场分布均匀的,具有较低外观品质因数的同轴输出腔。     

等效电路计算同轴输出腔TM310模式的间隙阻抗

设计了外Q值较小,工作于高阶横磁TM310模的X波段速调管单间隙同轴输出谐振腔。用微波等效电路理论计算了高阶横磁TM310模情形六个漂移管的等效间隙中心位置,由此计算腔内等效间隙中心到输出波导内横向膜片的等效长度。以MATLAB编程计算得到同轴谐振腔TM310模式加载矩形波导滤波器输出回路的间隙阻抗,其结果与传统冷测模拟法计算结果吻合。验证了等效长度计算方法的正确性,用于圆柱腔基模的传统微波等效电路理论能用于分析同轴谐振腔高阶横磁模式输出回路,且比传统的冷测模拟法及场分析法更为快捷。     

带远程监控的路灯照明节电控制系统设计

分析了基于微控制器C8051F310的路灯照明节电控制系统的工作原理,给出了该节电控制系统的硬件和软件设计结构框图。实验证明,该路灯照明节电控制系统实现方便,运行可靠,能有效节省电能,并能延长路灯的使用寿命。     

Characterisation of porosity and sensor response times of sol-gel-derived thin films for oxygen sensor applications

In recent years, sol-gel-derived films have played a significant role in optical sensor development. This paper focuses on the characterisation of oxygen-sensitive tetraethoxysilane (TEOS) and methyltriethoxysilane (MTEOS)-based films. Film porosity and sensor response times are reported for a range of films fabricated under different conditions. Porosity data are correlated with predicted film behaviour and also with previous characterisation studies. Oxygen diffusion coefficients are estimated from the response times. The enhanced diffusion coefficient of MTEOS films compared to TEOS films is discussed in terms of the relative oxygen solubility of the films. Comparisons are made with data for oxygen-sensitive polymer films, indicating an enhanced solubility for sol-gel films compared with typical polymer films.     

囚禁在随机光斑电势中的BEC的安德森定域化

通过数值方法产生一个随机函数来模拟实际的光 斑电势,在准一维和弱无序情况下及对数坐标中, 研究了囚禁在随机光斑电势中玻色-爱因斯坦凝聚(BEC)物质波的局域态及其稳定性和膨胀 特性。结果发 现,在无序存在和绝热条件下,物质波呈现出安德森定域化(AL)现象,并研究了弱的非线性 空间调制对物质波AL的影响。     

Significance of Oligomeric and Fibrillar Species in Amyloidosis: Insights into Pathophysiology and Treatment

Amyloidosis is a term referring to a group of various protein-misfolding diseases wherein normally soluble proteins form aggregates as insoluble amyloid fibrils. How, or whether, amyloid fibrils contribute to tissue damage in amyloidosis has been the topic of debate. In vitro studies have demonstrated the appearance of small globular oligomeric species during the incubation of amyloid beta peptide (Aβ). Nerve biopsy specimens from patients with systemic amyloidosis have suggested that globular structures similar to Aβ oligomers were generated from amorphous electron-dense materials and later developed into mature amyloid fibrils. Schwann cells adjacent to amyloid fibrils become atrophic and degenerative, suggesting that the direct tissue damage induced by amyloid fibrils plays an important role in systemic amyloidosis. In contrast, there is increasing evidence that oligomers, rather than amyloid fibrils, are responsible for cell death in neurodegenerative diseases, particularly Alzheimer’s disease. Disease-modifying therapies based on the pathophysiology of amyloidosis have now become available. Aducanumab, a human monoclonal antibody against the aggregated form of Aβ, was recently approved for Alzheimer’s disease, and other monoclonal antibodies, including gantenerumab, solanezumab, and lecanemab, could also be up for approval. As many other agents for amyloidosis will be developed in the future, studies to develop sensitive clinical scales for identifying improvement and markers that can act as surrogates for clinical scales should be conducted.     

1550nm与1310nm有线电视系统的比较

通过对1550 nm与1310 nm有线电视系统的比较,对县级广电网络的建设提出若干想法,其中包括环网建设、分配网建设、机房建设及双向网络改造等。     

一种基于超级电容器储能的光伏控制器的实现

近年来,由于能源和环境问题,太阳能的利用得到了快速的发展。超级电容器也是近几年来发展起来的一种专门用于储能的特殊电容器,相对于普通蓄电池和电容器,有其独特的优势。基于超级电容器设计,此控制器运用单片机软件实现了最大功率跟踪控制,并具有防反充,防过充以及防止过放的功能。实验结果证明控制器达到了最大功率跟踪的功能。