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Assessing safety in wind-exposed installations is crucial to preventing potential failures. This example explores the calculation and design adjustments needed to mount a circular disc on a building facade, where wind forces are a primary concern. A 4-meter diameter disc was initially designed as an aesthetic feature facing winds at a velocity of 25 meters per second, with an air density of 1.25 kilograms per cubic meter. Given these conditions, the drag force on the disc was determined using...
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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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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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The topic explores the practical aspects of adjusting steel reinforcements within a concrete beam section to meet specific design requirements. When designing a reinforced concrete beam, it is essential to distribute the steel reinforcements properly to ensure structural integrity and efficiency. The example provided details a scenario where a beam requires a total steel cross-section of 4 square inches. The engineer identifies that the available steel bars have a nominal diameter of 1.693...
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In situ Transverse Rectus Abdominis Myocutaneous Flap: A Rat Model of Myocutaneous Ischemia Reperfusion Injury
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Golden Ratio Flap Designed Using the Golden Ratio Rectangle.

Akio Sakamoto1, Toshiharu Fujita2, Takashi Noguchi1

  • 1From the Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Japan.

Plastic and Reconstructive Surgery. Global Open
|January 10, 2024
PubMed
Summary
This summary is machine-generated.

The novel golden ratio flap, utilizing a golden rectangle design, offers a reproducible method for arcuate repairs, simplifying surgical planning and execution for plastic and reconstructive surgery.

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Area of Science:

  • Plastic Surgery
  • Surgical Techniques
  • Biomedical Engineering

Background:

  • Rotation flaps are arcuate repairs crucial for redistributing tension and utilizing tissue laxity.
  • Logarithmic spiral curves can optimize incision length in flap design.
  • This study introduces a novel rotation flap design based on the golden rectangle.

Purpose of the Study:

  • To introduce and validate a novel rotation flap design, termed the golden ratio flap.
  • To assess the reproducibility and clinical applicability of the golden ratio flap design.
  • To provide a standardized method for designing rotation flaps using geometric principles.

Main Methods:

  • The golden ratio flap design utilizes a golden rectangle, with flap incisions forming arcs within its squares.
  • Key parameters, 'height' and 'bottom', are defined based on the golden rectangle's geometry and defect dimensions.
  • Retrospective analysis of four superficial sarcoma cases treated with rotation flaps approximating logarithmic spiral curves.

Main Results:

  • The golden ratio flap design demonstrated a high similarity to preoperative flap designs in the assessed cases.
  • The ratio of 'bottom' to defect diameter was 1.3, and the ratio of 'height' was 1.4.
  • The flap's height and bottom parameters accurately approximate its length and width, respectively.

Conclusions:

  • The golden ratio flap, designed using the golden rectangle, is a reproducible surgical technique.
  • The defined parameters provide a systematic approach for flap design and clinical application.
  • Step-by-step guidance for drawing the golden ratio flap is proposed for practical use.