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相关概念视频

Survival Tree01:19

Survival Tree

Survival trees are a non-parametric method used in survival analysis to model the relationship between a set of covariates and the time until an event of interest occurs, often referred to as the "time-to-event" or "survival time." This method is particularly useful when dealing with censored data, where the event has not occurred for some individuals by the end of the study period, or when the exact time of the event is unknown.
 Building a Survival Tree
Constructing a survival tree begins...
Downstream Processing01:29

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Downstream processing begins once fermentation is complete and involves a series of steps to recover and purify products such as acids, vitamins, antibiotics, or proteins.Cell HarvestingFor example, for intracellular protein-based products, the first step is harvesting the cells. This is typically achieved using centrifugation or filtration to separate the cells from the liquid phase.Cell Disruption for Intracellular ProductsIf the target product is intracellular, the harvested cells must be...

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相关实验视频

Updated: Jun 30, 2026

Isolation and Biophysical Study of Fruit Cuticles
15:53

Isolation and Biophysical Study of Fruit Cuticles

Published on: March 30, 2012

在颗粒流中剪切不稳定性.

David J Goldfarb1, Benjamin J Glasser, Troy Shinbrot

  • 1Department of Chemical and Biochemical Engineering, Rutgers University, Piscataway, New Jersey 08854-8058, USA.

Nature
|January 18, 2002
PubMed
概括
此摘要是机器生成的。

折射波以颗粒状的流体形成,以前没有观察到. 一个新的无维切数预测了从稳定到波动颗粒流的过渡.

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Cutting Procedures, Tensile Testing, and Ageing of Flexible Unidirectional Composite Laminates
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Optimization of Processing Technology for Tiebangchui with Zanba Based on CRITIC Combined with Box-Behnken Response Surface Method
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Optimization of Processing Technology for Tiebangchui with Zanba Based on CRITIC Combined with Box-Behnken Response Surface Method

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相关实验视频

Last Updated: Jun 30, 2026

Isolation and Biophysical Study of Fruit Cuticles
15:53

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Published on: March 30, 2012

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07:53

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Published on: April 27, 2019

Optimization of Processing Technology for Tiebangchui with Zanba Based on CRITIC Combined with Box-Behnken Response Surface Method
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科学领域:

  • 物理 物理学 物理
  • 地质物理学 地质物理学
  • 流体动力学 流体动力学

背景情况:

  • 不稳定的波在流体剪切层中得到了很好的研究,影响大气和海洋运输.
  • 这些不稳定性对于车辆和传热装置的滑流稳定性至关重要.
  • 对地质物理和工业系统至关重要的颗粒流动的不稳定性仍然在很大程度上未被记录.

研究的目的:

  • 记录和分析颗粒流中的不稳定性形成.
  • 研究导致在颗粒流的接口形成波浪的条件.
  • 为颗粒流动不稳定性开发模型和预测参数.

主要方法:

  • 使用分离板在倾斜的平面上对颗粒流的实验观测.
  • 对颗粒式流量模型的分析,以了解波浪形成机制.
  • 确定影响流动稳定性的关键参数.

主要成果:

  • 在两个相同颗粒的流之间的接口上观察到破裂波.
  • 波浪形成是由剪速或倾斜角度的变化引发的.
  • 一个颗粒式流量模型与实验数据有质地匹配,将波归因于竞争的剪切和延伸应变.

结论:

  • 这项研究报告了在颗粒状剪切流中观察到波动不稳定的新发现.
  • 一个无维切数被提议来规范从稳定到波动颗粒流程的过渡.
  • 这些发现有助于更好地理解颗粒流动动力学,并对各种科学和工程领域产生影响.