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Related Concept Videos

Mechanical Efficiency of Real Machines01:14

Mechanical Efficiency of Real Machines

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The mechanical efficiency of a machine is a fundamental concept that describes how effectively a machine can convert input work into output work. According to this concept, the efficiency of a machine is equal to the ratio of the output work to the input work. An ideal machine, meaning a machine that has no energy losses, has an efficiency of one. This implies that the input work and the output work are equal.
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The design of a transmission shaft is governed by two primary specifications: the power it transmits and its rotational speed. These parameters guide the selection of the shaft's material and cross-sectional dimensions, ensuring that the material's maximum shearing stress remains within the elastic limit while transmitting the desired power at the given speed. The system's power is intrinsically linked to the applied torque. The torque applied to the shaft can be calculated by...
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Design Example: Traverse Angle Computations01:25

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Traverse angle computations are a critical component of surveying, used to compute the internal angles within a closed traverse. A traverse consists of a series of connected lines forming a closed loop, often used for land boundary delineation or mapping. Calculating the internal angles ensures accuracy in the traverse geometry and is essential for checking survey data integrity.The process begins with known azimuths and bearings of the traverse sides. Internal angles at each vertex are...
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Column Efficiency: Plate Theory01:10

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Band broadening in a chromatography column is measured by its efficiency. This is determined by the number of theoretical plates (N). Theoretical plate theory states that a separation column consists of a continuous series of imaginary plates where solute equilibration occurs between stationary and mobile phases.
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Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. Consider a lifting tong carrying a 100 kg load. It comprises movable sections DAF and CBG linked together with member AB.
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Unsymmetric Loading of Thin-Walled Members: Problem Solving01:07

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The shear center of a channel section with uniform thickness, height, and width, is determined by computing the shear force in the member and calculating the moments of inertia of the sections.
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Application of Design Aspects in Uniaxial Loading Machine Development
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Improved efficiency for cross-arm comparisons via platform designs.

Tzu-Jung Huang1, Alex Luedtke2,

  • 1Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.

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|August 8, 2022
PubMed
Summary
This summary is machine-generated.

Platform trials offer greater statistical efficiency for comparing multiple interventions versus separate trials. Sharing controls in platform trials improves precision and power, even with fewer participants, for evaluating intervention efficacy.

Keywords:
COVID-19Efficiency gainNoninferiority testPlatform designsSurvival analysisVaccine efficacy

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Area of Science:

  • Clinical Trial Design
  • Biostatistics
  • Pharmaceutical Research

Background:

  • Platform trials are recognized for flexibility and resource efficiency.
  • The statistical efficiency of platform trials compared to traditional separate trials is not well understood.
  • Comparing multiple interventions requires robust statistical methods.

Purpose of the Study:

  • To establish the statistical efficiency of platform trials for comparing multiple interventions.
  • To develop and evaluate a novel procedure for noninferiority testing within platform trials.
  • To demonstrate the benefits of shared controls in platform trials.

Main Methods:

  • Theoretical and numerical studies were conducted to compare statistical precision.
  • A novel adaptive procedure for noninferiority testing against the most efficacious intervention was developed.
  • Data from two monoclonal antibody trials for HIV prevention were used for illustration.

Main Results:

  • Platform trials demonstrate identical or superior precision for comparing intervention relative risks versus control compared to separate trials.
  • The benefit of platform trials is attributed to the sharing of controls under contemporaneous randomization.
  • The novel noninferiority testing procedure shows substantially improved power in platform trials.

Conclusions:

  • Platform trials are statistically more efficient than separate trials for comparing multiple interventions.
  • Sharing controls in platform trials enhances precision and power for efficacy and noninferiority assessments.
  • The developed adaptive noninferiority test offers a significant advantage in platform trial settings.