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Stereotype Content Model02:16

Stereotype Content Model

13.1K
The Stereotype Content Model (SCM) was first proposed by Susan Fiske and her colleagues (Fiske, Cuddy, Glick & Xu, 2002; see also Fiske, 2012 and Fiske, 2017). The SCM specifies that when someone encounters a new group, they will stereotype them based on two metrics: warmth—or that group’s perceived intent, and how likely they are to provide help or inflict harm—and competence—or their ability to carry out that objective. Depending on the warmth-competence...
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Design Example: Vintage Mixing Console01:17

Design Example: Vintage Mixing Console

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A sound engineer at a music company recently encountered a problem. The output from their newly acquired studio's vintage mixing console was too low for the requirements of modern recording equipment. To rectify this situation, the engineer decided to design an audio pre-amplifier using an operational amplifier (op-amp) to boost the signal level.
The specifications for the pre-amplifier were clear. It needed to amplify the audio signal by a factor of 10, have an input impedance above 10...
711
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
1.9K
Electro-mechanical Systems01:19

Electro-mechanical Systems

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Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
A key component of the DC motor is the armature, a rotating circuit positioned within a magnetic field. As an electric current passes through the...
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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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System of Memory01:23

System of Memory

9.7K
Memory is categorized into three major systems: sensory memory, short-term memory (STM), and long-term memory (LTM). These systems differ in their capacity and the duration for which they can hold information. Sensory memory captures raw sensory input from the environment, holding it for just a few seconds or less. For example, on hearing a brief, loud sound, like a car horn honking, the sound seems to linger in the mind for a moment even after it stops. This is an instance of sensory memory...
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Video Experimental Relacionado

Updated: May 6, 2026

Shape Memory Polymers for Active Cell Culture
10:53

Shape Memory Polymers for Active Cell Culture

Published on: July 4, 2011

13.5K

Cerámica de baja histéresis con memoria de forma diseñada por modelado multimodo

Edward L Pang1, Gregory B Olson1, Christopher A Schuh2

  • 1Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.

Nature
|October 5, 2022
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores diseñaron cerámicas de circonio para aplicaciones de memoria de forma a altas temperaturas. Lograron una histeresis récord, haciendo que estas cerámicas avanzadas fueran viables para usos exigentes.

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Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
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Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

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Área de la Ciencia:

  • Ciencias de los materiales
  • Ingeniería cerámica
  • Transformaciones de fase

Sus antecedentes:

  • Las cerámicas de circonio poseen una transformación de fase martensítica que permite grandes tensiones para aplicaciones de memoria de forma y superelásticas a alta temperatura.
  • La aleación puede reducir la histeresis en materiales martensíticos, pero la zirconia presenta desafíos debido a los cambios de volumen y las barreras cinéticas.

Objetivo del estudio:

  • Desarrollar un método para aumentar la ingeniería de celosía en el diseño de martensita de circonio.
  • Para abordar las limitaciones físicas como el cambio de volumen y la gestión de la temperatura de transformación.
  • Para utilizar la termodinámica computacional y la ciencia de datos para el diseño de nuevas composiciones de circonio multicomponentes.

Principales métodos:

  • Enfoque de ingeniería de celosía aumentada para el diseño de martensita.
  • Aplicación de la termodinámica computacional y las herramientas de ciencia de datos.
  • Exploración de espacios complejos y escasos de datos.

Principales resultados:

  • Se desarrolló una nueva composición de zirconia con una histeresis récord (15 K).
  • Esta histeresis es aproximadamente diez veces menor que los valores típicos y cinco veces menor que los mejores valores informados anteriormente.
  • La histeresis lograda es comparable a las aleaciones de memoria de forma ampliamente desplegadas.

Conclusiones:

  • El método desarrollado aborda con éxito las limitaciones en la ingeniería de celosías de circonio.
  • La nueva composición de zirconio demuestra su potencial como material de memoria de forma a alta temperatura.
  • Este avance allana el camino para aplicaciones cerámicas avanzadas en entornos extremos.