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相关概念视频

Buffers02:56

Buffers

A solution containing appreciable amounts of a weak conjugate acid-base pair is called a buffer solution, or a buffer. Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl...
Frames01:30

Frames

Frames are essential components of various mechanical and structural systems used daily. These structures are known for their stability and ability to bear heavy loads. A frame is constructed using two-force and multi-force members, interconnected using pin joints. In contrast, trusses are made entirely of two-force members.
Frames are versatile and widely used in various applications such as structural supports for beams and columns, automobile chassis construction, and in the construction...
Frames: Problem Solving I01:24

Frames: Problem Solving I

Consider a jib crane with an external load suspended from the pulley. The dimensions of the crane members are shown in the figure. A systematic analysis of the frame structure is required to determine the reaction forces at the pin joints, assuming that the pulleys are frictionless.
Frames: Problem Solving II01:26

Frames: Problem Solving II

Consider a hydraulic hoist supporting a load of 1 kN. Assuming a simplified schematic representation of this frame structure, the force acting on BD and BF members can be determined.
Buffers: Buffer Capacity01:09

Buffers: Buffer Capacity

Buffer capacity is the quantitative measure of a buffer to resist the change in pH. As shown in the following equation, the buffer capacity, denoted by 'beta', is expressed as the number of moles of acid or base needed to change the pH of a one-liter buffer solution by 1 unit. Here, Ca and Cb indicate the number of moles of acid and base, respectively. Note that dpH represents the change in pH.
In the graph, pH is plotted as a function of the number of moles of base (Cb) added to a weak acid...
Buffers: Overview01:30

Buffers: Overview

Buffers play a crucial role in stabilizing the pH of a solution by mitigating the effects of small amounts of added acid or base. They consist of a weak acid and its conjugate base or a weak base and its conjugate acid. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl (aq).

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相关实验视频

Updated: Jun 23, 2026

A Method to Estimate Cadaveric Femur Cortical Strains During Fracture Testing Using Digital Image Correlation
09:34

A Method to Estimate Cadaveric Femur Cortical Strains During Fracture Testing Using Digital Image Correlation

Published on: September 14, 2017

框架计数储备的框架计数储备.

Martin G Stoel1, Felix Zijlstra, Cees A Visser

  • 1Hospital of the Free University, Department of Cardiology, Amsterdam, The Netherlands. mg.stoel@vumc.nl

Circulation
|June 11, 2003
PubMed
概括
此摘要是机器生成的。

TIMI的数储备 (FCR) 可以估计冠状动脉流速储备 (CVR). 这种血管造影方法为在导管实验室中评估冠状动脉狭窄的意义提供了一个有价值的替代方案.

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A Method to Estimate Cadaveric Femur Cortical Strains During Fracture Testing Using Digital Image Correlation
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Published on: September 14, 2017

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科学领域:

  • 心脏病学 心脏病学
  • 干预心脏病学 干预心脏病学
  • 诊断成像 诊断成像 诊断成像

背景情况:

  • 冠状动脉流速储备 (CVR) 评估冠状动脉狭窄,但需要干预性心脏病学家.
  • 在导管实验室常规使用需要一种替代的血管造影方法.

研究的目的:

  • 调查TIMI框架计数储备 (FCR) 和CVR之间的关系.
  • 确定FCR是否可以作为CVR的血管图形替代品.

主要方法:

  • 在38名患者中,计算了LAD和LCx的相对FCR和CVR.
  • 测量船舶长度和计算的数流速.
  • 比较FCR和CVR,以及相对的FCR和相对的CVR.

主要成果:

  • 在FCR和CVR (r=0.62) 和相对FCR和相对CVR (r=0.84) 之间发现了强烈的相关性.
  • 在LAD和LCx之间,平均FCR和CVR没有显著差异.
  • 船舶长度和TIMI框架数量在LAD和LCx之间有显著差异,但流速和体积流量估计没有.

结论:

  • 相对数储备 (FCR) 可以有效估计相对冠状动脉流速储备 (CVR).
  • FCR为评估冠状动脉狭窄的意义提供了一个可行的血管学替代方案.