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Related Concept Videos

Design Consideration01:22

Design Consideration

609
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.
The factor of safety is another key...
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Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

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This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
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PD Controller: Design01:26

PD Controller: Design

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In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
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Posttensioned Masonry Walls01:15

Posttensioned Masonry Walls

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Post-tensioned masonry walls use high-strength steel rods or flexible tendons to enhance the strength and efficiency of masonry structures. These elements are securely anchored to the foundation and extend vertically either within the cores of the masonry units or between the masonry wythes. The construction process involves building the wall with these tensioning elements in place and allowing the mortar to fully cure.
Following the curing process, the tensioning begins. Steel rods are...
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Work01:14

Work

848
Work is a fundamental concept of mechanical engineering and has many applications. Understanding how work is calculated and the different types of work can help us better understand physical processes and provide insights into complex problems.
Work is defined as the result of a force acting on an object, causing it to move along the line of action of force. It is also defined as the process of transferring energy through the application of force on an object, resulting in its displacement.
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Work01:22

Work

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Work is done when energy is transferred from one object to another. In other words, work is when a force acts on something that undergoes a displacement from one position to another. Forces can vary as a function of position, and displacements can be along various paths between two points. The increment of work (dW) done by a force acting through an infinitesimal displacement can be defined as the dot product of force () and displacement () vectors.
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Four Temporary Waterslide Designs Adapted to Different Slope Conditions to Encourage Child Socialization in Playgrounds
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Project TENDR.

Laura Anderko1

  • 1Laura Anderko is the Robert and Kathleen Scanlon Endowed Chair in Values Based Health Care and a professor at the Georgetown University School of Nursing and Health Studies in Washington, DC. Contact author: la266@georgetown.edu. The author has disclosed no potential conflicts of interest, financial or otherwise.

The American Journal of Nursing
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Summary
This summary is machine-generated.

Toxic chemicals in everyday products pose risks to cognitive and neurodevelopmental health. Project TENDR aims to reduce exposure to these harmful environmental pollutants.

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Area of Science:

  • Environmental Health
  • Toxicology
  • Neuroscience

Background:

  • Chemicals are prevalent in daily life, impacting food, water, air, and consumer products.
  • Exposure to toxic chemicals is linked to cognitive, behavioral, and neurodevelopmental disorders across all life stages.
  • The Toxic Substances Control Act of 1976 has faced criticism for its ineffectiveness in safeguarding public health from chemical risks.

Purpose of the Study:

  • To highlight the scientific evidence connecting environmental chemicals to neurodevelopmental disorders.
  • To introduce Project TENDR (Targeting Environmental Neuro-Developmental Risks) as a collaborative initiative.
  • To advocate for reducing exposure to chemicals and pollutants that harm neurodevelopment.

Main Methods:

  • Review of scientific evidence linking environmental chemicals to neurodevelopmental outcomes.
  • Formation of a multi-disciplinary initiative (Project TENDR) involving scientists, health professionals, and advocates.
  • Development of a call to action to address chemical exposures.

Main Results:

  • Established scientific consensus on the link between toxic environmental chemicals and neurodevelopmental disorders.
  • Initiation of Project TENDR to address this public health concern.
  • A call to action was issued to mitigate exposures.

Conclusions:

  • Urgent need to reduce exposure to toxic environmental chemicals.
  • Project TENDR provides a framework for addressing neurodevelopmental risks from environmental exposures.
  • Policy and public health interventions are necessary to protect vulnerable populations.