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関連する概念動画

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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関連する実験動画

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

流体ベッド:ついに2つの根付いた慣行に挑戦

A M Squires, M Kwauk, A A Avidan

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

    粗固体と細粉末のために開発された流化技術は,現在,従来のボイラーと触媒炉に挑戦しています. バブルフリー流体化の進歩と微粒子の振る舞いの理解は,燃焼と触媒の改善の鍵です.

    科学分野:

    • 化学工学は化学工学というものです.
    • 燃焼科学 燃焼科学とは
    • 粒子技術とは

    背景:

    • 20世紀初頭には2つの異なる流体化技術が登場した:一つは粗固体,もう一つは細粉末.
    • 歴史的に,流体化の研究は,石炭燃焼のような粗厚な固体の泡床を強調しました.
    • 精細粉末流化プロセスは,効率のためにバブル抑制を優先します.

    研究 の 目的:

    • 流体化技術の進化する景色を強調するために.
    • 従来のシステムに対する流体ベッド炉の競争力の増大を強調する.
    • カタリシスと燃焼における流体化を促進するための重要な研究分野を特定する.

    主な方法:

    • 粗厚な固体と微細な粉末のための流化工学の歴史的発展のレビュー.
    • フリーボード燃焼を含む石炭燃焼流体ベッドの設計上の考慮事項の分析.
    • 薄粉末流体化におけるバブル抑制戦略の検討.
    • 流体床の競争力の評価,粉砕炭ボイラーと固定床触媒炉との比較.
    • 流体床触媒の研究のニーズを特定し,特に細粒子 (<40ミクロメートル) に関する研究を行う.

    主要な成果:

    • 流体化燃焼ベッドは,従来の粉砕石炭ボイラーにますます挑戦しています.

    さらに関連する動画

    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

    関連する実験動画

    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

  • 流体化ベッドは,特に高硫黄燃料の場合,排出量の優れた制御を提供します.
  • バブル抑制 (バブルレス) 流体化の進歩は,固定ベッド触媒炉との競争力を高めています.

    • 結論:

    • 流体化技術は2つの異なる,しかしますます競争の激しいアプリケーションに成熟しました.
    • 流体ベッド炉を触媒化に最適化するには,細粒子の振る舞い (40マイクロメートル以下) と高気速に関するさらなる調査が必要です.
    • 流体化ベッドは,石炭燃焼の排出量管理と触媒プロセスの効率化における重要な進歩を表しています.