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相关概念视频

Flow Table Test01:12

Flow Table Test

The flow table test is an established method used to assess the workability of concrete, particularly useful for evaluating highly flowable concrete mixes. This test employs an apparatus that consists of a wooden board topped with a steel plate, collectively weighing 35 pounds. The board is connected to a base via a hinge and measures 27.6 inches on each side.
Concrete is placed within a truncated cone mold that is 8 inches high with an 8-inch base diameter and a 5-inch top diameter. The...
Placing Concrete01:17

Placing Concrete

The concrete is placed as close as possible to its final position to avoid segregation. The placed concrete is then fully compacted to expel the entrapped air, and the next layer of concrete is laid while the underlying layer is still in the plastic state. The rate at which concrete is placed and compacted is kept equal.
While placing concrete, care is taken to ensure that the concrete is laid in uniform layers, and hand shoveling and moving concrete using poker vibrators is avoided. Also,...
Finishing Concrete01:18

Finishing Concrete

Concrete finishing starts immediately after the concrete has been placed and consolidated. The initial step, screeding, involves leveling the concrete surface by removing excess material to flush it with the formwork's top. Following this, bull float or darby are employed to smooth the surface further, effectively lower high spots, fill low areas, and ensure larger aggregate particles are embedded within the concrete. This preparation is critical before the appearance of bleed water, as its...

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相关实验视频

Updated: Jun 25, 2026

A Microfluidic Device with Groove Patterns for Studying Cellular Behavior
13:50

A Microfluidic Device with Groove Patterns for Studying Cellular Behavior

Published on: August 30, 2007

流体床:最后,挑战两个根深蒂固的做法.

A M Squires, M Kwauk, A A Avidan

    Science (New York, N.Y.)
    |December 20, 1985
    PubMed
    概括

    为粗固体和细粉末开发的流化技术现在挑战了传统的炉和催化反应器. 在无泡流化和了解细颗粒行为的进步是改善燃烧和催化的关键.

    科学领域:

    • 化学工程是化学工程的重要组成部分.
    • 燃烧科学 燃烧科学
    • 颗粒技术 颗粒技术

    背景情况:

    • 20世纪初出现了两种不同的流化技术:一种用于粗固体,另一种用于细粉末.
    • 从历史上看,流化研究强调了煤炭燃烧等粗体固体的泡床.
    • 精细粉末流化工艺优先考虑抑制泡以提高效率.

    研究的目的:

    • 为了突出流化技术的不断发展的景观.
    • 为了强调流体床反应堆与传统系统的竞争力日益增长.
    • 确定关键的研究领域,以推进催化和燃烧中的流化.

    主要方法:

    • 对粗固体和细粉末的流化工艺的历史发展进行了回顾.
    • 分析煤炭燃烧流体床的设计考虑因素,包括自由板燃烧.
    • 检查精细粉末流化中的气泡抑制策略.
    • 评估流体床与粉煤炉和固定床催化反应堆的竞争力.
    • 确定流体床催化学的研究需求,特别是关于细颗粒 (<40微米) 的研究.

    主要成果:

    • 液化燃烧床越来越多地挑战传统的粉碎煤炉.
    • 液化床提供了对排放的优越控制,特别是对于高硫燃料.

    更多相关视频

    Wicking Tests for Unidirectional Fabrics: Measurements of Capillary Parameters to Evaluate Capillary Pressure in Liquid Composite Molding Processes
    07:06

    Wicking Tests for Unidirectional Fabrics: Measurements of Capillary Parameters to Evaluate Capillary Pressure in Liquid Composite Molding Processes

    Published on: January 27, 2017

    Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars
    08:02

    Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars

    Published on: February 11, 2020

    相关实验视频

    Last Updated: Jun 25, 2026

    A Microfluidic Device with Groove Patterns for Studying Cellular Behavior
    13:50

    A Microfluidic Device with Groove Patterns for Studying Cellular Behavior

    Published on: August 30, 2007

    Wicking Tests for Unidirectional Fabrics: Measurements of Capillary Parameters to Evaluate Capillary Pressure in Liquid Composite Molding Processes
    07:06

    Wicking Tests for Unidirectional Fabrics: Measurements of Capillary Parameters to Evaluate Capillary Pressure in Liquid Composite Molding Processes

    Published on: January 27, 2017

    Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars
    08:02

    Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars

    Published on: February 11, 2020

  • 气泡抑制 (无气泡) 流化技术的进步提高了固定床催化反应堆的竞争力.

    • 结论:

    • 流化技术已经成熟成为两个截然不同的,但日益竞争激烈的应用.
    • 优化流体床反应堆的催化需要进一步调查细颗粒的行为 (40微米以下) 和更高的气体速度.
    • 流化床代表了煤炭燃烧和催化过程效率的排放控制的重大进步.