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相关概念视频

Shape and Texture of Coarse Aggregate01:25

Shape and Texture of Coarse Aggregate

238
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...
238
Porosity in Cement Paste01:18

Porosity in Cement Paste

178
The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is...
178

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相关实验视频

Updated: Jul 23, 2025

Processing Embryo, Eggshell, and Fungal Culture for Scanning Electron Microscopy
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Processing Embryo, Eggshell, and Fungal Culture for Scanning Electron Microscopy

Published on: August 16, 2019

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在有斑点的鸟蛋中,表面纹理异质.

Marie R G Attard1,2,3, James Bowen2, Steven J Portugal1,4

  • 1Department of Biological Sciences, School of Life and Environmental Sciences, Royal Holloway University of London, Egham TW20 0EX, UK.

Journal of the Royal Society, Interface
|July 12, 2023
PubMed
概括
此摘要是机器生成的。

有图案的鸟蛋比它们的背景有更粗的色素斑点. 这种表面质地差异与息地和其他生命历史特征有关,这表明进化影响了蛋结构.

关键词:
一个鸟,一个鸟,一个鸟.蛋蛋蛋的蛋是什么意思染 染 染 是一种粗性 粗性 粗性的表面质地 表面质地地形学地形学地形学

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相关实验视频

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科学领域:

  • 进化生物学 进化生物学
  • 动物学 动物学
  • 生物物理学的生物物理.

背景情况:

  • 鸟蛋表现出多样化的色彩和图案,其拟议的功能包括密码,温度调节和信号传递.
  • 蛋色素可能会影响表面质地,影响与水和微生物的相互作用.

研究的目的:

  • 为了调查有图案的 (有斑点的) 蛋是否与没有图案的 (无斑点的) 蛋相比具有不同的表面地形.
  • 为了确定卵色素,表面纹理和鸟类物种的生命历史特征之间的关系.

主要方法:

  • 测量了来自204种有斑点和166种无斑点物种的蛋的表面粗度 (Sa),斜度 (Ssk) 和曲度 (Sku).
  • 利用了基因组学控制的分析来评估表面地形上的差异,并确定蛋结构的预测因素.

主要成果:

  • 在71%的研究物种中,与背景颜料相比,斑点卵显示出明显粗的前景颜料.
  • 纯净的蛋在表面质地上与斑点蛋的背景颜料没有什么区别.
  • 表面粗度的差异在来自密集息地的物种中更为明显,并且与各种生活历史特征 (如饮食,巢类型和离合器大小) 相相关.

结论:

  • 蛋表面质地,特别是前景和背景色素之间的差异,是由与息地和生命历史战略相关的进化压力形成的.
  • 生命史的特征在现代鸟类蛋表面纹理的多样化中发挥着重要作用.