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相关概念视频

Special considerations while measuring pulse01:13

Special considerations while measuring pulse

578
Assessing a patient's pulse is a fundamental skill in healthcare, but certain situations require special attention:
578
Pulse rhythm01:30

Pulse rhythm

790
Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac...
790
Rectangular and Triangular Pulse Function01:19

Rectangular and Triangular Pulse Function

675
The unit rectangular pulse function is mathematically represented by a rectangular function centered at the origin with a height of one unit. This function is defined by two parameters: T, which specifies the center location of the pulse along the time axis, and τ, which determines the pulse duration.
For example, consider a rectangular pulse with a 5V amplitude, a 3-second duration, and centered at t=2 seconds. This pulse can be expressed using the rectangular function, written as,
675
Noncompartmental Analysis: Mean Residence Time01:05

Noncompartmental Analysis: Mean Residence Time

140
According to statistical moment theory, mean residence time (MRT) is an important measure in pharmacokinetics. MRT can be defined as the expected mean of a probability density function distribution. It provides valuable insights into drug disposition in the body.
After the administration of a drug through intravenous bolus injection, the drug molecules are distributed throughout the body and remain there for varying periods. The MRT represents the average time these drug molecules stay in the...
140
Sampling Continuous Time Signal01:11

Sampling Continuous Time Signal

237
In signal processing, a continuous-time signal can be sampled using an impulse-train sampling technique, followed by the zero-order hold method. Impulse-train sampling involves the use of a periodic impulse train, which consists of a series of delta functions spaced at regular intervals determined by the sampling period. When a continuous-time signal is multiplied by this impulse train, it generates impulses with amplitudes corresponding to the signal's values at the sampling points.
In the...
237
Linear Approximation in Time Domain01:21

Linear Approximation in Time Domain

81
Nonlinear systems often require sophisticated approaches for accurate modeling and analysis, with state-space representation being particularly effective. This method is especially useful for systems where variables and parameters vary with time or operating conditions, such as in a simple pendulum or a translational mechanical system with nonlinear springs.
For a simple pendulum with a mass evenly distributed along its length and the center of mass located at half the pendulum's length,...
81

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相关实验视频

Updated: Jun 28, 2025

Measurement & Analysis of the Temporal Discrimination Threshold Applied to Cervical Dystonia
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基于脉冲间隔分布的死亡时间估计方法的研究.

Junlong Liu1, Xu Hong1, Haixi Huang1

  • 1The College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu, 610059, China.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine
|April 22, 2024
PubMed
概括
此摘要是机器生成的。

这项研究提出了一种用于核辐射检测系统中估计死亡时间的新方法,这对于准确的定量分析至关重要,特别是在高计数速度下. 开发的系统实现了高精度,在600kCPS时的误差不到5%.

关键词:
死亡时间 死亡时间脉冲间隔的分布 脉冲间隔的分布真正的输入计数速度

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科学领域:

  • 核仪器仪表 核仪器仪表 核仪器仪表 核仪器仪表
  • 辐射检测物理学 辐射检测物理
  • 信号处理 信号处理

背景情况:

  • 辐射探测器的死亡时间导致低估,影响定量分析.
  • 准确的死亡时间估计对于纠正测量计数至关重要,特别是在高事件率的情况下.
  • 在高计数率条件下,现有的方法可能会在准确性方面扎.

研究的目的:

  • 开发和验证一种方法,以高计数率估计探测器死亡时间.
  • 在定量分析中提高辐射计数恢复的准确性.
  • 为了减轻脉冲堆积在探测器系统中的影响.

主要方法:

  • 使用FPGA实现了脉冲间隔分布测量系统.
  • 采用数字极零取消来减少脉冲衰变时间常数.
  • 使用EDXRF实验平台进行高计数率验证.

主要成果:

  • 该系统准确地估计了真正的输入计数速率,即使在高达600kCPS的速度.
  • 在理论和估计的真实输入计数率之间实现了不到5%的相对误差.
  • 根据测量和估计的真数率,成功计算了死亡时间.

结论:

  • 拟议的方法有效地估计了核辐射检测中高计数率的死亡时间.
  • 数字极零取消技术成功地减少了堆积效应.
  • 开发的系统提供了一个可行的解决方案,用于在高速率辐射检测场景中进行准确的定量分析.