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相关概念视频

Molecular Shapes01:18

Molecular Shapes

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Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.
Two regions of electron density in a diatomic...
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Molecular Shape and Polarity03:37

Molecular Shape and Polarity

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Dipole Moment of a Molecule
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VSEPR Theory and the Basic Shapes02:52

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First Derivatives and the Shape of a Graph01:22

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In calculus, the concept of the first derivative plays a crucial role in understanding the behavior of a function over its domain. The first derivative, denoted as f’(x), provides insight into how a function changes at any given point, much like a cyclist adjusting speed along a winding trail. By analyzing the first derivative, mathematicians can determine where a function is increasing, decreasing, or reaching critical points.The first derivative provides a precise method for classifying...
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Second Derivatives and the Shape of a Graph01:29

Second Derivatives and the Shape of a Graph

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The second derivative of a function provides essential information about a graph's curvature and how it changes over an interval. It helps determine whether a function is concave upward or concave downward and identifies points where the curvature changes. These properties are fundamental in analyzing real-world scenarios, such as changes in road elevation, population growth, and economic trends.A function f(x) is considered concave upward on an interval if its graph lies above all its tangent...
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Shape and Texture of Coarse Aggregate01:25

Shape and Texture of Coarse Aggregate

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Aggregate shape is classified based on the relative sharpness or roundness of the edges and corners. This classification includes categories like rounded, angular, elongated, and flaky, each with specific characteristics. Rounded aggregates, fully shaped by attrition, are typical of river or seashore gravel, while angular aggregates, such as crushed rock, have well-defined edges. Aggregates that are elongated and flaky are less desirable, as they can reduce the workability and strength of...
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塑造水凝生物墨水成3D,多尺度,可 perfusable 模型使用多模式打印.

Puskal Kunwar, Arun Poudel, Ujjwal Aryal

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    本研究介绍了一种混合的3D打印方法,将数字光投影和两光子剥离相结合起来,用于复杂的软水凝结构. 这种新的方法可以为先进的生物制造应用创建复杂的,可 perfusable 微结构.

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    科学领域:

    • 生物材料工程 生物材料工程
    • 生物制造的生物制造
    • 组织工程是组织工程.

    背景情况:

    • 制造复杂的3D软水凝结构是具有挑战性的,因为在打印尺寸,分辨率和生物墨水性质的权衡.
    • 现有的3D打印方法在同时实现多尺度和多材料复杂性方面存在局限性.

    研究的目的:

    • 开发一个混合的3D打印平台,集成增量和减量制造模式.
    • 为了克服多式制造中的挑战,创建复杂的,可 perfusable 水凝结构.

    主要方法:

    • 综合数字光投影 (DLP) 用于宏观增材制造,与微观减量制造的双光子剥离 (TPA).
    • 确定了适合DLP和TPA工艺的水凝生物油墨配方.
    • 解决了包括对齐,软硬材料印刷和水凝膨胀在内的技术挑战.

    主要成果:

    • 成功地制造出厘米尺度的水凝结构,嵌入微尺度的可 perfusable 拓.
    • 证明了复杂结构的制造,如可 perfusable 微流体芯片和模拟膜-毛囊接口的双流体电路.
    • 实现了与孤立的DLP或TPA方法无法实现的多层次复杂性.

    结论:

    • 混合DLP-TPA平台为制造复杂,多尺度,多材料软水凝结构提供了一个新的解决方案.
    • 这项技术可以创建先进的生物制造结构,包括具有类似体内复杂性的器官芯片模型.
    • 该平台有助于无传媒 perfusion 和改善机械弱结构的处理.