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Related Concept Videos

Rigid Body Equilibrium Problems - I00:49

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Rigid Body Equilibrium Problems - II01:21

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A rigid body is in static equilibrium when the net force and the net torque acting on the system are equal to zero.
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Imagine a solid object involved in a general planar movement, with its center of mass pinpointed at a spot labeled G. The object's kinetic energy relative to an arbitrary point A can be quantified for each of its particles - the ith particle in this case. This measurement is achieved through the employment of the relative velocity definition. The position vector, known as rA, extends from point A to the mass element i.
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Equation of Motion for a Rigid Body01:12

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The movement of a rigid object can be understood through the equations that explain both translational and rotational motion about the center of mass of the object, point G. This center of mass is the point where the equation of motion for translational motion comes into play, as per Newton's Second Law.
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Virtual Work for a System of Connected Rigid Bodies01:06

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Virtual work is a powerful method used to solve problems involving several connected rigid bodies. When the system is in equilibrium, virtual work is zero. This allows the calculation of the resulting forces when a system undergoes a virtual displacement. When attempting to analyze such a system, first, use a free-body diagram, where an independent coordinate represents the configuration of the links, and mark its deflected position resulting from the positive virtual displacement.
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The total angular momentum of a rigid body can be calculated using the summation of the angular momentum of all the tiny particles rotating in the same plane. Considering all the tiny particles rotating in the x-y plane, the direction of angular momentum of all such particles and that of the rigid body would be perpendicular to the plane of the rotation along the z-axis.
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RNAi-mediated Control of Aflatoxins in Peanut: Method to Analyze Mycotoxin Production and Transgene Expression in the Peanut/Aspergillus Pathosystem
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Open-Cell Rigid Polyurethane Foams from Peanut Shell-Derived Polyols Prepared under Different Post-Processing

Guangyu Zhang1, Yumin Wu1, Weisheng Chen2

  • 1State Key Laboratory Base of Eco-chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.

Polymers
|August 28, 2019
PubMed
Summary

This study developed biodegradable open-cell rigid polyurethane foams (RPUFs) from peanut shell bio-based polyols. Neutralization significantly improved RPUF properties like water absorption and strength, suggesting eco-friendly material applications.

Keywords:
bio-based polyolsfloral foampeanut shellrigid polyurethane foams

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Materials

Background:

  • Bio-based polyurethane materials offer biodegradable solutions for environmental conservation.
  • Open-cell rigid polyurethane foams (RPUFs) have diverse applications due to their porous structure.

Purpose of the Study:

  • To prepare open-cell rigid polyurethane foams (RPUFs) using bio-based polyols (BBPs) from peanut shells.
  • To investigate the impact of post-processing conditions (neutralization and filtration) of BBPs on RPUF properties.

Main Methods:

  • Preparation of RPUFs using BBPs derived from liquefied peanut shells.
  • Evaluation of RPUF properties including foaming behavior, density, dimensional stability, water absorption, swelling ratio, and compressive strength.
  • Microstructural analysis of the prepared RPUFs.

Main Results:

  • Neutralization of BBPs significantly influenced RPUF properties, whereas filtration had a minor effect.
  • RPUFs from neutralized BBPs showed enhanced water absorption (636-777%), improved dimensional stability (<0.5%), and higher compressive strength (>200 KPa).
  • The prepared RPUFs exhibited a low swelling rate (approx. 1%) and a uniform, open-cell structure.

Conclusions:

  • Neutralization is a critical step in processing BBPs for RPUF fabrication.
  • The developed RPUFs demonstrate excellent properties, including high water absorption and good mechanical strength.
  • These bio-based RPUFs show potential for applications such as floral foam due to their favorable characteristics.