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Design Consideration01:22

Design Consideration

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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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Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
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Related Experiment Video

Updated: Feb 6, 2026

A Postoperative Evaluation Guideline for Computer-Assisted Reconstruction of the Mandible
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Reconstructive considerations in low and middle-income countries.

Brian Cervenka1, Stephen Trudeau2, Johan Fagan3

  • 1Department of Otolaryngology-Head and Neck Surgery, University of California at Davis, Davis, Sacramento, California.

Current Opinion in Otolaryngology & Head and Neck Surgery
|August 21, 2018
PubMed
Summary

Complex head and neck reconstructions are feasible in low- and middle-income countries (LMICs). Regional flaps offer effective solutions, minimizing resources and optimizing patient care, while microvascular surgery is also utilized.

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Area of Science:

  • Head and Neck Surgery
  • Reconstructive Surgery
  • Global Health

Background:

  • Surgical mission trips for head and neck reconstruction are increasing in low- and middle-income countries (LMICs).
  • Tailoring reconstructive options to local conditions and patient needs is crucial for effective care and training.

Purpose of the Study:

  • To review reconstructive options for head and neck defects in LMICs.
  • To evaluate the feasibility and outcomes of complex reconstructions in resource-limited settings.

Main Methods:

  • Review of published case series on head and neck reconstructions in LMICs.
  • Analysis of regional and microvascular flap techniques used in these settings.

Main Results:

  • Regional flaps, including pectoralis, supraclavicular, and submental island flaps, are versatile for head and neck reconstruction.
  • Microvascular reconstruction has been performed in 15 case series in LMICs with an average success rate of 87.1%.

Conclusions:

  • Complex head and neck reconstructions are achievable in LMICs.
  • While microvascular options exist, regional and local flaps are often preferred due to lower resource demands and reduced operating time, offering comparable benefits.