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Uncertainty in Measurement: Accuracy and Precision03:37

Uncertainty in Measurement: Accuracy and Precision

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Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value. 
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Control systems are everywhere in contemporary society, influencing diverse applications from aerospace to automated manufacturing. These systems can be found naturally within biological processes, such as blood sugar regulation and heart rate adjustment in response to stress, as well as in man-made systems like elevators and automated vehicles. A control system is essentially a network of subsystems and processes that collaboratively convert specific inputs into desired outputs.
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Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value.  Highly accurate...
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Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
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The fineness modulus (FM) of aggregate is a numerical index that measures the coarseness or fineness of the particles. It is calculated by adding the cumulative percentages of aggregate retained on each of a specified series of sieves and dividing the sum by 100.
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Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
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Measurement of Spatial Stability in Precision Grip
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Controlling precision on the ring.

Guillaume Berionni1

  • 1Department of Chemistry and Namur Institute of Structured Matter, Université de Namur, 5000 Namur, Belgium.

Science (New York, N.Y.)
|December 7, 2023
PubMed
Summary

Cobalt catalysts enable the desired borylation of fluoroaromatic compounds. This breakthrough offers a new synthetic route for creating valuable organoboron compounds.

Area of Science:

  • Organic Chemistry
  • Catalysis

Background:

  • Fluoroaromatic compounds are important building blocks in pharmaceuticals and materials science.
  • Borylation reactions are crucial for introducing boron functional groups, enabling further chemical transformations.
  • Developing efficient methods for the borylation of fluoroaromatic compounds remains a significant challenge in synthetic chemistry.

Purpose of the Study:

  • To develop a novel catalytic system for the direct borylation of fluoroaromatic compounds.
  • To investigate the efficacy of cobalt catalysts in promoting this transformation.

Main Methods:

  • Screening of various cobalt catalysts and reaction conditions.
  • Optimization of solvent, temperature, and additives for the borylation reaction.
  • Characterization of the borylated products using spectroscopic techniques.

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Main Results:

  • The study successfully achieved the desired borylation of various fluoroaromatic compounds using cobalt catalysts.
  • High yields and selectivity were observed for the target borylated products.
  • The developed method demonstrates broad substrate scope and functional group tolerance.

Conclusions:

  • Cobalt catalysts are effective for the direct borylation of fluoroaromatic compounds.
  • This methodology provides a valuable new tool for accessing organoboron compounds derived from fluoroaromatics.
  • The findings open avenues for the synthesis of novel fluorinated molecules with potential applications.