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Related Concept Videos

Space Trusses01:25

Space Trusses

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A space truss is a three-dimensional counterpart of a planar truss. These structures consist of members connected at their ends, often utilizing ball-and-socket joints to create a stable and versatile framework. The space truss is widely used in various construction projects due to its adaptability and capacity to withstand complex loads.
At the core of a space truss lies the fundamental unit known as the tetrahedron. This structure is composed of six members that form a three-dimensional shape...
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Zero-Force Member01:30

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A truss is a framework that comprises slender members connected at their ends by joints. Trusses are widely used in engineering and architecture to stabilize and strengthen structures like bridges, roofs, and towers. Truss members are designed to carry loads through tension and compression, enabling the truss to withstand external forces.
One critical concept in truss design is the idea of zero-force members. It refers to a truss member that experiences no stress under loading conditions.
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Space Trusses: Problem Solving01:29

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A space truss is a three-dimensional counterpart of a planar truss. These structures consist of members connected at their ends, often utilizing ball-and-socket joints to create a stable and versatile framework. Due to its adaptability and capacity to withstand complex loads, the space truss is widely used in various construction projects.
Consider a tripod consisting of a tetrahedral space truss with a ball-and-socket joint at C. Suppose the height and lengths of the horizontal and vertical...
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Steel Manufacturing01:26

Steel Manufacturing

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Steel manufacturing is a multi-stage process that begins by smelting iron ore into cast iron in a blast furnace. This initial stage involves layering iron ore with coke, a type of fuel, and crushed limestone within the furnace. The coke is ignited with a high volume of air, leading to the creation of carbon monoxide, which acts to reduce the iron ore to pure iron.
During this smelting process, limestone plays a crucial role by forming slag. Slag captures impurities within the molten iron, such...
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Steel Fastening Techniques01:17

Steel Fastening Techniques

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Steel sections can be joined together through various fastening techniques including riveting, bolting, and welding, each suitable for different structural requirements and conditions.
Rivets are cylindrical steel fasteners with a specially designed head. During application, rivets are heated until white-hot and then inserted through pre-drilled holes in the steel sections. A pneumatic hammer is used to shape the exposed end into a second head, securing the sections together.
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Simple Trusses01:21

Simple Trusses

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A truss is a structural framework consisting of slender members connected at joints, designed to support external loads while minimizing material usage and weight. Simple trusses are a type of planar truss where all members lie within a single two-dimensional plane.
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The impact of the Hamas-Israel conflict on the U.S. defense industry stock market return.

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Trump tariffs and the U.S. defense industry.

Jeroen Klomp1,2

  • 1Netherlands Defense Academy, Breda, The Netherlands.

Plos One
|January 24, 2025
PubMed
Summary

U.S. steel and aluminum tariffs negatively impacted defense companies' stock returns. Investors perceived these trade restrictions as detrimental, leading to significant negative abnormal returns around key tariff events.

Area of Science:

  • Economics
  • Finance
  • International Trade

Background:

  • In March 2018, the U.S. imposed tariffs on steel and aluminum imports.
  • The defense industry is a major consumer of metals, making it vulnerable to import restrictions.

Purpose of the Study:

  • To analyze the effect of steel and aluminum tariffs on the equity returns of U.S. defense companies.
  • To assess investor perception of trade uncertainty related to Section 232 of the Trade Expansion Act.

Main Methods:

  • Construction of a novel trade uncertainty indicator based on key Section 232 events.
  • Empirical analysis of stock market reactions to tariff-related announcements.

Main Results:

  • Investors perceived the tariffs as detrimental to U.S. defense firms.

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  • Negative abnormal stock returns were observed around key tariff-related events.
  • Investor sentiment worsened after the official tariff announcement, exceeding prior expectations.

    • Conclusions:

    • The introduction of steel and aluminum tariffs negatively affected the financial performance of U.S. defense companies.
    • Investor reactions indicate a significant market perception of harm from these trade policies.