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201.
分析了常用模数转换器的控制时序,并以AD0809为例,对由CPLD构建的多路采集控制电路的内部原理做了详细分析。给出了基于CPLD控制的多路数据自动采集系统设计方案,仿真验证本方案是可行的。 相似文献
202.
The range of memory impairments associated with Alzheimer’s disease (AD) has been a focus for psychological and clinical re-searchers for many years. In addition to investigations of AD patients’ veridical memory using traditional recognition memory tasks, a number of recent studies have focused on false memories to reveal the underlying causes of memory impairment in AD. Studies comparing illusory memories between AD patients and healthy older people have revealed various differences in memory deficits between the development of AD and the typical aging processes. Here, we review 3 types of memory illusions tested in AD patients: associative memory illusions, fluency-based false memories and source memory errors. By comparing AD patients with healthy older adults, we sought to analyze the mechanisms underlying AD-related memory impairments at different stages of memory processing, including encoding, retrieval and monitoring. This comparison revealed that AD patients exhibit an impaired ability to establish and utilize gist representations at the encoding stage and impairments in processing on the basis of familiarity and recollection at the retrieval stage. Consequently, patients with AD have access to less information when making memory judgments. As a result, they become more susceptible to the effects of item fluency, which can be manipulated during the retrieval stage. Furthermore, with impaired source memory monitoring abilities, the capacity of AD patients to suppress memory illusions is compromised. Based on these findings, we propose that the study of false memories constitute a critical tool for elucidating the memory impairments involved in AD. Further explorations of these memory impairments will have practical significance for the diagnosis and treatment of AD in the future. 相似文献
203.
204.
介绍了一种以FPGA为核心逻辑控制模块的数据采集系统的设计。设计中采用了16位的AD8405作为模数转换器,FPGA作为中心逻辑控制模块,对弹上的不同速率的模拟信号与接收的数字信号进行采集,并将采集的信号通过数据帧格式的形式混合编帧和存储,再通过串口完成与上位机的通信。FPGA模块采用VHDL语言进行设计。该系统在测试状态下通过地面测试系统对该采编器的采集过程进行实时监测,并对其功能进行检测。 相似文献
205.
Amyloid precursor protein (APP) plays a critical role in the formation of Alzheimer's disease (AD). The intracellular domain APP (AID) was suggested to cause neurotoxicity in the nucleus. To investigate the functions AID, yeast two-hybrid screening was performed to identify the proteins which interact with AID. The human brain cDNA library was screened using pGBKT7-AID as a bait, and several positive clones were identified. One of them encodes a part of the human stathmin-like 2 protein (STMN2). The interaction between STMN2 and APP implies that STMN2 may have an important function in APP-mediated AD formation. 相似文献
206.
旋转变压器是一种高分辨率的角度传感器。系统设计一种以AD2S1200为核心的数字解码电路系统。它以振荡电路产生的正弦波电压信号作为旋变的激励信号,加上相关的外围电路,构成了旋转变压器-数字转换器,解算出旋变的轴角θ和旋变的转速n:并在此基础上,分析产生角度解算误差的各种因素。 相似文献
207.
208.
TMS320F2812与模数转换器AD7656的接口设计 总被引:1,自引:0,他引:1
介绍了模数转换器AD7656的性能和工作原理,给出了AD7656与DSP芯片TMS320F2812的接口设计,其中包括硬件电路设计与ADC模块的初始化编程。 相似文献
209.
介绍了AD590温度传感器的特性和系统结构设计,重点阐述了虚拟仪器系统的构建和系统软件设计.利用虚拟仪器丰富的开发资源,基本不投入仪器设备及硬件,设计出具有较高的应用价值的传感器特性测试系统.并用软件进行滤波及归一化处理抑制采集噪声,提高系统的测试精度. 相似文献
210.