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関連する概念動画

Nuclear Stability03:18

Nuclear Stability

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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together...
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RNA Stability01:53

RNA Stability

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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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Stability01:28

Stability

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The time response of a linear time-invariant (LTI) system can be divided into transient and steady-state responses. The transient response represents the system's initial reaction to a change in input and diminishes to zero over time. In contrast, the steady-state response is the behavior that persists after the transient effects have faded.
The stability of an LTI system is determined by the roots of its characteristic equation, known as poles. A system is stable if it produces a bounded...
394
Stability of structures01:14

Stability of structures

495
In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
495
Pole and System Stability01:24

Pole and System Stability

933
The transfer function is a fundamental concept representing the ratio of two polynomials. The numerator and denominator encapsulate the system's dynamics. The zeros and poles of this transfer function are critical in determining the system's behavior and stability.
Simple poles are unique roots of the denominator polynomial. Each simple pole corresponds to a distinct solution to the system's characteristic equation, typically resulting in exponential decay terms in the system's...
933
Multimachine Stability01:25

Multimachine Stability

558
Multimachine stability analysis is crucial for understanding the dynamics and stability of power systems with multiple synchronous machines. The objective is to solve the swing equations for a network of M machines connected to an N-bus power system.
In analyzing the system, the nodal equations represent the relationship between bus voltages, machine voltages, and machine currents. The nodal equation is given by:
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Measuring Spatially- and Directionally-varying Light Scattering from Biological Material
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光安定化ダイナミック素材

Hannes A Houck1,2,3, Eva Blasco3, Filip E Du Prez1

  • 1Polymer Chemistry Research Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry , Ghent University , Krijgslaan 281 S4-bis , 9000 Gent , Belgium.

Journal of the American Chemical Society
|June 27, 2019
PubMed
まとめ
この要約は機械生成です。

新しいダイナミックな材料は 固体と液体の状態を 光のみで変換します この光安定化ポリマーネットワークの形成と解離は,熱や他のトリガーなしで発生し,調節可能な材料特性を可能にします.

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Revealing Dynamic Processes of Materials in Liquids Using Liquid Cell Transmission Electron Microscopy
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Using Multiple Light Scattering to Examine the Stability of Phyllanthus emblica L. Extracts Obtained with Different Extraction Methods
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科学分野:

  • ポリマー化学
  • 材料科学
  • 写真化学

背景:

  • 従来の光反応性ポリマーは,反転可能な共性結合の変化のために特定の波長または熱を必要とします.
  • ポリマー適応のための既存の方法は,侵入的トリガーを含め,その適用範囲を制限します.
  • ダイナミックな共性化学は 適応性のある物質ネットワークを作るための経路を提供します

研究 の 目的:

  • 可視光を用いた可逆的なトポロジ的変化を経験する光安定化ダイナミックな材料を開発する.
  • 材料の適応に必要な 熱や特定の波長といった 外部要因を回避するためです
  • 光制御ポリマーネットワークの形成と解離のためのフォト・ディエルス・アルダー反応の使用を調査する.

主な方法:

  • トライアゾリンジオンとナフタレン間のフォト・ディエルス・アルダー反応を,ダイナミックな共性結合メカニズムとして利用した.
  • ネットワーク形成を誘導する可視緑色光を用いて,共振的に交互に結合した物質を生成する.
  • 材料を液体状態に変換するために,暗闇で周りの温度で自発的なサイクロレバーションを観察した.

主要な成果:

  • 可視光源をオン・オフするだけで,交結固体から液体製剤へのポリマー材料の繰り返し移行が実証された.
  • 可視光によって安定させられ,照明下での材料の整合性を維持することが示された.
  • 外部の介入なしに 暗闇で自発的なネットワーク崩壊が確認されました

結論:

  • 可視光を用いた需要に応じた可逆的なトポロジーの変化を提供する 新種の光安定化ダイナミック素材を開発した.
  • 光-ダイエルス-アルダー反応は,光制御ポリマーネットワークのダイナミクスのための効果的なプラットフォームを提供します.
  • これらの材料は,光と暗闇によって調節可能な性質を制御できる光に誘導されたアプリケーションの可能性を秘めています.