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Buffers

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...

Frames

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 I

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 II

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 Capacity

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: Overview

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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Updated: Jun 23, 2026

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

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

Published on: September 14, 2017

Reserva de recuento de cuadros para el recuento de cuadros.

Martin G Stoel¹, Felix Zijlstra, Cees A Visser

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

|June 11, 2003

Resumen

Este resumen es generado por máquina.

La reserva de recuento de fotogramas (FCR) de TIMI puede estimar la reserva de velocidad de flujo coronario (CVR). Este método angiográfico ofrece una valiosa alternativa para evaluar la importancia de la estenosis coronaria en el laboratorio de cateterismo.

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Área de la Ciencia:

Cardiología Cardiología.
Cardiología Intervencionista Cardiología intervencionista.
Imágenes de diagnóstico por imágenes.

Sus antecedentes:

La reserva de velocidad de flujo coronario (CVR) evalúa la estenosis coronaria, pero requiere cardiólogos intervencionistas.
Se necesita un método angiográfico alternativo para el uso de rutina en los laboratorios de cateterismo.

Objetivo del estudio:

Para investigar la relación entre la reserva de recuento de cuadros de TIMI (FCR) y CVR.
Para determinar si la FCR puede servir como un sustituto angiográfico para la CVR.

Principales métodos:

FCR y CVR relativos calculados en 38 pacientes para LAD y LCx.
La longitud medida del recipiente y la velocidad de flujo de recuento de cuadros calculada.
Comparado FCR y CVR, y FCR relativo y CVR relativo.

Principales resultados:

Se encontró una fuerte correlación entre la FCR y la CVR (r=0,62) y la FCR relativa y la CVR relativa (r=0,84).
No hay diferencias significativas en el promedio de FCR y CVR entre LAD y LCx.
La longitud del buque y el recuento de cuadros TIMI diferían significativamente entre LAD y LCx, pero las estimaciones de velocidad de flujo y flujo de volumen no.

Conclusiones:

La reserva relativa de recuento de fotogramas (FCR) puede estimar efectivamente la reserva relativa de velocidad de flujo coronario (CVR).
La FCR proporciona una alternativa angiográfica viable para evaluar la importancia de la estenosis coronaria.