CCD磁动式测氧仪的电路设计

文章首先介绍了“CCD磁动式测氧仪”的结构、测量原理,然后介绍TCD1500C的驱动时序和采用CPLD设计的时序驱动电路,最后介绍与单片机的数据接口电路。     

彩超与TCD联合检查头臂型大动脉炎的价值

目的：探讨经颅多普勒与彩色多普勒超声联合检查头臂型大动脉炎的价值。方法：应用彩超和TCD检查7例头臂型大动脉炎患者的颅内和颅外动脉．分析二维及血流动力学指标。结果：头臂型大动脉炎病变多位于颅外动脉起始段或近心端（84％）；颅外段动脉狭窄程度与颅内动脉流速呈大致负相关；结论：彩超与TCD联合检查头臂型大动脉炎，对于了解动脉炎所致血管狭窄的分布情况及分析颅外动脉狭窄或闭塞对颅内循环的影响具有重要诊断价值。     

表象训练对脑血流速度的影响

目的:探讨表象训练对脑血流速度(cerebral blood flow velocity, CBFV)的影响及性别对CBFV变化的影响.方法:在表象训练时及其先前的休息期,对20名正常大学生用经颅多普勒(TCD)监测其双侧大脑中动脉CBFV的变化.结果:与休息时相比,表象训练的相对变化值左侧为9.40±3.16,右侧为15.86±5.82,表象训练诱导出双侧大脑中动脉CBFV的非常显著增加(P＜0.01).表象训练的偏侧指数(LI)为24.73±14.48(P＜0.01),呈现出显著的右侧半球偏侧化,性别对CBFV偏侧化不产生显著影响,但表象训练诱导的CBFV的增加在两性间有显著的差异(P＜0.05).结论:表象训练能引起双侧大脑中动脉CBFV的非常显著性增加,且可诱导CBFV的右侧偏侧化.     

气相色谱仪检定装置不确定度评定

测量不确定度是与测量结果相关、表示被测量的量值分散性的参数,它是评定被测量的真值所处范围的一个参数。根据JJG700-1999《气相色谱仪检定规程》,按照不确定度评定原则,对一套气相色谱检定装置进行不确定度评定。     

Benefits of combination of electroencephalography, short latency somatosensory evoked potentials, and transcranial Doppler techniques for confirming brain death

Objective: Optimization of combining electroencephalography (EEG), short latency somatosensory evoked potentials (SLSEP) and transcranial Doppler (TCD) techniques to diagnose brain death. Methods: One hundred and eleven patients (69 males, 42 females) from the major hospitals of Zhejiang Province were examined with portable EEG, SLSEP and TCD devices. Re-examinations occurred ≤12 h later. Results: The first examination revealed that the combination of SLSEP and EEG led to more sensitive diagnoses than the c...     

创新管理课程(MIA)教学设计

该文以现代教育技术的理论为基础 ,对“MIA课程”进行教学设计 ,首次提出了TCD和LCD的概念。使用TCD (TeachingCenterDesign———以“教”为中心的教学设计 )和 (LearningCenterDesign———以“学”为中心的教学设计 )两种理论并行的教学策略     

TCD study of hemodynamic changes in PCA response to photic stimulation

Objectives: During visual stimulation, the elevated metabolism rate will couple with increase of blood flow velocity(BFV) in posterior cerebral artery(PCA). This study with TCD was aimed to investigate whether the coupling might change according to the different vasoneuronal conditions. Methods: Ninety-nine volunteers including 24 hypertension(HT) patients and 2 patients suffering from both HT and diabetes mellitus(DM) were enrolled in this trial. BFV and pulse indexes(PI) in P2 segments of PCA on both sides were monitored during visual stimulation. Results: In all subjects, Mean BFV increased and PI went down in response to visual stimulation. The percentages of changes (ΔV and ΔP) of both mean BFV and PI were larger in young group(<55 years old) than in old one(≥55 years old). There was significant positive correlation between ΔV and ΔP. Multivariated regression analysis did not show HT and DM, but age related to ΔV(ΔP). We did not find significant difference of ΔV(ΔP) between left and right sides. Conclusions: Blood flow velocity in PCA P2 segment increased due to decreased cerebrovascular resistance during visual stimulation and the response weakened with aging of the patient.     

TCD study of hemodynamic changes in PCA response to photic stimulation

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条纹计数器的光电转换模块设计

介绍光学干涉实验系统条纹计数器中的一种光电转换及数据采集模块的设计方案。以单片机AT89C52为核心,以线性光电传感器TCD132D对光信号进行采集,然后采用12位并行A/D转换器A/D1674对CCD输出的模拟量进行转换,最后通过串口传输数据给计算机,进行数据的分析和计算。同时,给出了硬件电路图和数据采集的主程序。     

基于74LS/HC123的新型面阵CCD驱动电路

在线阵CCD驱动时序产生的基础上，提出了一种基于74LS／HCl23的新型面阵CCD驱动电路，结合常用的芯片TCD1500C，详细说明面阵CCD驱动电路的具体实现方法。