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相关概念视频

Porosity in Cement Paste01:18

Porosity in Cement Paste

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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...
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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
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3-Dimensional Resin Casting and Imaging of Mouse Portal Vein or Intrahepatic Bile Duct System
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覆盖双形件:材料是否重要?

Alexa J Karkenny1, Allyn Morris1, Cameron Smith2

  • 1Department of Orthopaedic Surgery, Montefiore Einstein.

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|June 28, 2024
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概括
此摘要是机器生成的。

与半刚性玻璃纤维 (SF) 或弹性带 (EB) 相比,用刚性玻璃纤维 (RF) 覆盖双式件提供了优越的机械性能. 然而,在这种断裂模型中,SF覆盖件的性能与传统固体件的性能相当.

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Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
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科学领域:

  • 整形医生生物机械学
  • 医疗器械中的材料科学
  • 骨折管理技术 骨折管理技术

背景情况:

  • 双形件需要覆盖以保持结构完整.
  • 在临床应用中,对覆盖式双模具的机械性能进行比较至关重要.
  • 这项研究研究了超包裹双形造骨折 (OBCBF) 模型.

研究的目的:

  • 为了比较不同材料覆盖的双模具的机械性能.
  • 评估半刚性玻璃纤维 (SF),弹性带 (EB) 和刚性玻璃纤维 (RF) 在恢复造完整性的有效性.
  • 为整形外科医生提供关于覆盖型件的材料选择的证据.

主要方法:

  • 使用MTS Bionix伺服液压系统进行四点曲测试.
  • 在四个条件下测试了OBCBF模型:完整的对照,刚性,半刚性和弹性覆盖.
  • 生成的力位移曲线来确定负载在临界失效 (LCF) 和刚度.

主要成果:

  • 刚性玻璃纤维覆盖显示出明显更高的LCF和刚性,而不是半刚性或弹性选项.
  • 在半刚性玻璃纤维覆盖和完整的对照件之间没有发现LCF和刚性的显著差异.
  • 机械性能排名:刚性 > 控制 > 半刚性 > 弹性.

结论:

  • 超包装材料对双件的机械性能产生重大影响.
  • 刚性玻璃纤维提供了最大的恢复机械完整性.
  • 在某些骨折场景中,半刚性玻璃纤维可能会为传统造提供可行的替代品.