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Lift01:23

Lift

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Lift is a fundamental aerodynamic force that acts perpendicular to the direction of airflow. It plays a central role in achieving and sustaining flight and in stabilizing various vehicles. Lift primarily originates from pressure differences created across surfaces, such as an airfoil. A lower pressure region forms above the wing, while a higher pressure region forms below it, generating an upward force. This differential results from the shape and orientation of the airfoil, enabling the wing...
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Stress Concentrations in Circular Shafts01:18

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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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Determination of Pi Terms01:15

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The Buckingham Pi theorem is a valuable method in dimensional analysis, reducing complex relationships between variables into dimensionless terms. Relevant variables in analyzing the lift force on an airplane wing include lift force, air density, wing area, aircraft velocity, and air viscosity. Expressing each variable in terms of fundamental dimensions — mass, length, and time — provides a consistent foundation for constructing these dimensionless terms.
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Design Example: Calculating Safe Diameter for Wind-Exposed Disc01:17

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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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Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

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An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque...
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Design Consideration01:22

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Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
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Risk Factor Analysis of Freestyle Propeller Flaps.

Joo Myong Paik1, Jai-Kyong Pyon1

  • 1Department of Plastic Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea.

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Freestyle propeller flaps are a reliable option for trunk reconstruction but have a high complication rate in extremities. Previous irradiation and longer arcs of rotation increase risks, necessitating careful patient selection.

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Area of Science:

  • Plastic Surgery
  • Reconstructive Surgery
  • Microsurgery

Background:

  • Freestyle propeller flaps are utilized for trunk and extremity reconstruction.
  • They offer "like-with-like" reconstruction using adjacent tissue without vessel dissection.
  • Vascular complications remain a concern with this technique.

Purpose of the Study:

  • To investigate the incidence of vascular complications.
  • To identify risk factors for complications following freestyle propeller flap reconstruction.
  • To compare complication rates between trunk and extremity reconstructions.

Main Methods:

  • Retrospective review of 55 freestyle propeller flaps in 50 patients (2004-2015).
  • Data collected included patient demographics, surgical details (arc of rotation), and flap complications.
  • Analysis focused on identifying significant risk factors for flap failure.

Main Results:

  • 18.2% complication rate (10 of 55 flaps), including partial and total necrosis.
  • Previous irradiation was a significant risk factor for flap complications.
  • Flaps on extremities had higher complication rates than those on the trunk; arcs of rotation >150 degrees showed marginal significance.

Conclusions:

  • Freestyle propeller flaps are valid for trunk reconstruction.
  • High complication rates in extremities suggest caution.
  • Thorough preoperative evaluation and preparation are crucial for extremity reconstructions using this method.