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関連する概念動画

Stereotype Content Model02:16

Stereotype Content Model

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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

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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...
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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.
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Electro-mechanical Systems01:19

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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.
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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.
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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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Updated: May 6, 2026

Shape Memory Polymers for Active Cell Culture
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マルチモードモデリングで設計された低ヒステリシス形状記憶セラミック

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
まとめ
この要約は機械生成です。

研究者は高温形状メモリアプリケーションのためにジルコニアセラミクスを設計しました. この高度なセラミクスを 要求の高い用途に適したものにしました

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Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
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Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
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科学分野:

  • 材料科学
  • セラミック・エンジニアリング
  • フェーズ変換

背景:

  • ジルコニアセラミックは,高温形状記憶および超弾性アプリケーションのための大きなストレインを可能にするマルテンシット相変換を有しています.
  • 合金化によりマルテンシート材料のヒステリシスが減るが,ジルコニアは体積変化と運動的障壁により課題となる.

研究 の 目的:

  • ジルコニアマーテンサイト設計における格子工学を拡張する方法を開発する.
  • ボリューム変化や変換温度管理などの物理的な制約に対処するためです.
  • 新しい多成分ジルコニア組成物を設計するために,計算熱力学とデータ科学を利用する.

主な方法:

  • マルテンサイト設計のための拡張格子エンジニアリングアプローチ.
  • 計算熱力学とデータサイエンスツールの応用
  • 複雑でデータに乏しい多要素空間を探索する.

主要な成果:

  • 低ヒステリシス (15 K) の新ジルコニア組成物が開発された.
  • このヒステレシスは,典型的な値より約10倍,以前報告されたベスト値より5倍低い.
  • 達成されたヒステリシスは,広範囲に展開されている形状記憶合金に匹敵する.

結論:

  • 開発された方法は,ジルコニアの格子工学の制約をうまく対処しています.
  • 新しいジルコニア組成は,高温形状記憶材料としての可能性を示しています.
  • この突破は 極端な環境での高度なセラミックアプリケーションの 道を切り開きます