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相关概念视频

Distribution and Dispersion00:54

Distribution and Dispersion

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To understand intra-specific interactions in populations, scientists measure the spatial arrangement of species individuals. This geographic arrangement is known as the species distribution or dispersion. Highly territorial species exhibit a uniform distribution pattern, in which individuals are spaced at relatively equal distances from one another. Species that are highly tied to particular resources, such as food or shelter, tend to concentrate around those resources, and thus exhibit a...
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Strategies of Self-Presentation II: Self-Verification01:17

Strategies of Self-Presentation II: Self-Verification

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Self-verification is a fundamental psychological drive wherein individuals seek affirmation of their self-concept from others, striving for consistency between their internal self-view and external perceptions. This drive operates even when the self-concept is negative, influencing interpersonal behavior and feedback preferences in complex and often counterintuitive ways. Unlike the self-enhancement motive, which seeks positive evaluations, self-verification prioritizes coherence and...
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Persuasion Strategies01:52

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Researchers have tested many persuasion strategies, including the foot-in-the door and the door-in-the-face techniques, in a variety of contexts. Ultimately, the principles are effective in selling products and changing people’s attitude, ideas, and behaviors (Cialdini & Goldstein, 2004).
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Coping Strategies: Problem Focused01:27

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Coping strategies are methods people use to manage, tolerate, or reduce the effects of stressors. These strategies involve both behavioral and psychological actions to handle stressful situations. One common approach is problem-focused coping, which aims to change or eliminate the source of stress rather than merely addressing its consequences. This method involves taking direct action to resolve the issue causing stress.
For example, consider a student who struggles to understand their...
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Coping Strategies: Emotion Focused01:20

Coping Strategies: Emotion Focused

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Emotion-focused coping refers to a set of strategies aimed at managing the emotional impact of stressors, rather than directly addressing their causes. This approach involves altering one's emotional response to stressful situations to reduce their psychological effects. For example, individuals might talk with a friend or engage in activities like journaling to express their feelings. Such actions can help achieve emotional clarity or release, providing the psychological stability needed...
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Guidelines and Strategies for Safe Computer Charting

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The guidelines and strategies provided by the American Nurses Association (ANA) and the Canadian Nurses Association (CNA) offer essential principles for ensuring safe and secure computer charting systems in healthcare settings. Let's break down each recommendation:
Maintain Confidentiality and Security:
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纳米粒子分散的一般策略

Michael E Mackay1, Anish Tuteja, Phillip M Duxbury

  • 1Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA. mackay@msu.edu

Science (New York, N.Y.)
|March 25, 2006
PubMed
概括

在聚合物中实现稳定的纳米粒子分散是具有挑战性的. 增强分散发生在聚合物链比纳米颗粒大时,由增加的分子接触和特定的加工策略驱动.

科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物科学 聚合物科学
  • 纳米技术纳米技术

背景情况:

  • 纳米颗粒在聚合物中的分散在历史上是困难的,往往导致相位分离和粒子聚合.
  • 实现均的纳米粒子分布对于先进的材料特性至关重要.

研究的目的:

  • 调查增强纳米粒子在线性聚合物的热力学稳定分散的因素.
  • 了解聚合物链大小和处理策略在纳米粒子分散中的作用.

主要方法:

  • 纳米粒子-聚合物相互作用的理论分析.
  • 模拟聚合物链膨胀和旋转半径的变化与纳米粒子结合.
  • 考虑热力学驱动力 (和) 和动力学可访问性.

主要成果:

  • 当聚合物的旋转半径超过纳米粒子的半径时,热力学稳定的纳米粒子分散得到增强.
  • 纳米粒子导致聚合物链膨胀,增加聚合物的旋转半径,以更高的纳米粒子体积分数.
  • 从纳米粒子表面增加的分子接触中获得的度增长抵消了度处罚.

结论:

  • 纳米粒子分散稳定性是由纳米粒子和聚合物链的相对大小决定的.

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  • 处理策略对于访问热力学稳定的分散状态至关重要,特别是线性聚合物中的富勒烯.