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相关概念视频

Thermal Insulation in Masonry Walls01:22

Thermal Insulation in Masonry Walls

198
In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
198
Insulation Coordination01:23

Insulation Coordination

239
Insulation coordination is the process of matching electric equipment's insulation strength with protective device characteristics to protect the equipment against expected overvoltages. This selection is based on engineering judgment and cost. Equipment can generally withstand short-duration high transient overvoltages, but repeated tests with identical waveforms can yield inconsistent results. As a result, standard impulse voltage waveforms are used for testing, defined by specific times...
239
Masonry in Cold and Hot Weather Conditions01:21

Masonry in Cold and Hot Weather Conditions

137
In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
Other key practices include keeping masonry units...
137
Frost Resistant Concrete01:29

Frost Resistant Concrete

141
Concrete's susceptibility to frost damage during freeze-thaw cycles demands strategic measures to enhance its frost resistance. Employing techniques like air entrainment, adjusting the water-cement ratio, proper curing, and selecting appropriate aggregates are essential.
Introducing microscopic air bubbles into the concrete mix through air entrainment creates small voids that accommodate ice expansion, thereby reducing internal pressures and preventing cracking. The optimal amount of...
141
Superplasticizers01:30

Superplasticizers

122
Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
122
Shotcrete01:18

Shotcrete

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Shotcrete is a specialized technique where mortar or small aggregate concrete rich in cement content is sprayed onto a surface at high velocity. The force of impact compacts the material and enables it to cling to vertical or overhead areas without sagging. The technique involves layering the shotcrete in stages until it reaches approximately 4 inches in thickness. Operator skill in nozzle management is pivotal in deciding the quality of the shotcrete. Shotcrete is used in constructing tunnel...
159

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Updated: Sep 20, 2025

Twin-Screw Extrusion Process to Produce Renewable Fiberboards
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生物启发的干蒸汽超绝缘吸草泡

Taotao Meng1, Long Zhu1, Dylan Stone1

  • 1Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, USA.

Small (Weinheim an der Bergstrasse, Germany)
|May 28, 2025
PubMed
概括

这项研究介绍了一种来自农业废物的新型生物泡,灵感来自羽毛. 这种可持续的绝缘材料为绿色建筑提供了出色的热性能.

关键词:
生物灵感设计的设计纤维素纤维素的使用方法复合材料 复合材料 是一种复合材料.绝缘的绝缘是一种绝缘.

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Microfluidic Fabrication Techniques for High-Pressure Testing of Microscale Supercritical CO2 Foam Transport in Fractured Unconventional Reservoirs
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Achieving Moderate Pressures in Sealed Vessels Using Dry Ice As a Solid CO2 Source
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科学领域:

  • 材料科学 材料科学 材料科学
  • 可持续工程 可持续工程
  • 生物技术是生物技术.

背景情况:

  • 纤维素材料对建筑节能有前途,但由于结构崩而导致热性能差.
  • 现有的生物基绝缘材料往往缺乏广泛采用所需的结构完整性和热效率.

研究的目的:

  • 利用农业废物开发一种新的高性能生物基绝缘泡.
  • 为了模仿天然羽毛的微观结构特性,以增强绝热性能.
  • 评估开发的生物泡和绝缘面板的热,机械和环境性能.

主要方法:

  • 在现场合成生物纤维,其分支结构支持空洞的微球.
  • 蒸汽介导加工以创建轻量级,多孔的泡结构.
  • 泡属性的表征,包括密度,多孔度,导热率和压力强度.
  • 一个包含生物泡核心的被动化绝缘板的制造和测试.
  • 评估材料的碳足迹.

主要成果:

  • 生物泡具有低密度 (95 mg/cm3),高孔性 (95.5%) 和低导热率 (0.03 W/mK).
  • 由于其协同作用的微观结构,泡表现出良好的循环压力强度 (在50%应变下90kPa).
  • 绝缘板实现了0.0275 W/mK的导热率和6.85 MPa的屈曲强度,在60天内保持稳定的性能.
  • 生物泡的碳足迹很低 (7.50公斤CO2/公斤-1在70.2%重量%的).

结论:

  • 与通过环境干燥处理的其他生物基材料相比,开发的生物泡提供了优越的绝热.
  • 生物泡和衍生绝缘板为绿色建筑提供了一个有前途的可持续绝缘解决方案.
  • 仿生方法成功地从农业废物中制造出一种轻量级,结构坚固,热效的绝缘材料.