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相关概念视频

Toughness and Hardness of Aggregate01:22

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Toughness and hardness are critical properties of aggregate materials used in concrete, particularly on pavement surfaces and industrial flooring subjected to heavy loads. Toughness is defined as the aggregate's resistance to failure by impact and is measured by the aggregate impact value (AIV). For this, the aggregate impact value test is performed, wherein the impact is delivered by a standard hammer, which falls freely under its own weight onto the aggregates. The aggregates fragment in...
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Bending of Material: Problem Solving01:09

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In this lesson, determine the ratio of the maximum bending moments applied to two metal pipes, given that both pipes can withstand a maximum stress of 100 MPa. Both pipes have an outer radius of 1.8 cm. Pipe A has an inner radius of 1.5 cm, and Pipe B has an inner radius of 1 cm. The ratio of the maximum bending moment applied to two metallic pipes, each with a different inner and outer radius, is determined by considering their dimensions. The inner radius of the first pipe is 1.5 cm, and for...
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将超硬材料视为异常物

Ziyan Zhang1, Jakoah Brgoch1,2

  • 1Department of Chemistry, University of Houston, Houston, Texas 77204, United States.

Journal of the American Chemical Society
|September 22, 2022
PubMed
概括

研究人员开发了一个异常检测框架来发现极为罕见的超硬材料. 这种人工智能方法通过分析组成和晶体结构来识别具有特殊硬度的材料,并提供对其属性的洞察.

科学领域:

  • 材料科学
  • 计算材料科学
  • 材料发现中的人工智能

背景情况:

  • 以维克斯硬度≥40GPa定义的超硬材料非常罕见,占已知材料的不到0.1%.
  • 发现新的超硬材料对于各种技术应用至关重要,但由于它们的稀缺性,仍然是一个重大挑战.

研究的目的:

  • 开发一种新的无监督异常检测框架来识别超硬材料.
  • 借助人工智能发现超硬性以外的罕见和特殊的物理性质.

主要方法:

  • 创建了一个异常检测框架来编码和重建材料组成和晶体结构数据.
  • 该模型量化了与"正常"材料行为的偏差,以确定具有潜在超硬性质的异常值.

主要成果:

  • 该框架成功地确定了具有超硬特性的异常材料.
  • 对编码和解码晶体结构之间的差异分析为材料硬度的起源提供了基本的见解.

结论:

  • 无监督的异常检测方法对于发现稀缺的超硬材料是有效的.
  • 该方法可用于设计具有独特和意想不到的物理性质的其他异常材料.

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