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相关概念视频

Factors Affecting Workability01:24

Factors Affecting Workability

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The workability of concrete is a critical characteristic that influences the ease of mixing, handling, and finishing the concrete. It is affected by several factors including water content, aggregate properties, and admixtures like air entrainment. Water plays a fundamental role as it lubricates the concrete mix, facilitating easier movement and placement. However, the water requirement varies depending on the texture and shape of aggregates. Finer particles and angular, rough-textured...
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Responses to Drought and Flooding02:41

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Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
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Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
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This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
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Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
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相关实验视频

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优化小麦的发展,使其适应各种冬季气候.

Dominique Hirsz1, Laura E Dixon1

  • 1IPK Gatersleben, Corrensstrasse 3, D-06466, Seeland, Germany.

Journal of experimental botany
|March 15, 2026
PubMed
概括
此摘要是机器生成的。

气候变化破坏了农作物生产. 了解冬季小麦如何对光周期和温度线索做出反应,对于开发适应气候变化的品种至关重要.

关键词:
适应 适应 适应 适应气候变化 气候变化 气候变化在本地化,本地化.冬季小麦 冬季小麦

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科学领域:

  • 农业科学 农业科学
  • 植物生物学 植物生物学
  • 适应气候变化 适应气候变化

背景情况:

  • 气候变化对全球作物生产构成重大威胁,因为它改变了植物发育所必需的环境线索.
  • 作为全球主要作物之一的小麦依赖光周期和温度来调节开花时间,因此对气候变化敏感.
  • 冬季小麦品种特别容易受到寒冷持续时间和春季光周期的变化的影响,这会影响产量和可持续性.

研究的目的:

  • 研究冬季小麦对光周期和温度的反应的基因和生理机制.
  • 为了确定关键的基因调节花的过渡和开花,以响应环境信号.
  • 探索开发适应气候变化的冬季小麦品种,适应不断变化的环境条件的策略.

主要方法:

  • 审查关于小麦光周期和温度反应的现有文献.
  • 对参与花开时间调节的遗传通路的分析.
  • 探索提高冬季耐寒性和环境可塑性的育种策略.

主要成果:

  • 确定了关键的基因网络,调解小麦对光周期和温度的反应.
  • 突出了冬季小麦对冬季寒冷和春季光周期变化的敏感性.
  • 概述了培育适应气候变化的冬季小麦的挑战和机会.

结论:

  • 了解光周期和温度的相互作用对于冬季小麦适应气候变化至关重要.
  • 开发能够抵御冬季条件但在本土化要求上仍然灵活的品种是关键.
  • 对基因与环境相互作用的进一步研究将有助于创造可持续和高产的冬季小麦品种.