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相关概念视频

Uniform Distribution01:19

Uniform Distribution

The uniform distribution is a continuous probability distribution of events with an equal probability of occurrence. This distribution is rectangular.Two essential properties of this distribution are The area under the rectangular shape equals 1. There is a correspondence between the probability of an event and the area under the curve.Further, the mean and standard deviation of the uniform distribution can be calculated when the lower and upper cut-offs, denoted as a and b,...
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
Fineness Modulus01:19

Fineness Modulus

The fineness modulus (FM) of aggregate is a numerical index that measures the coarseness or fineness of the particles. It is calculated by adding the cumulative percentages of aggregate retained on each of a specified series of sieves and dividing the sum by 100.
Consider performing sieve analysis on sand through a set of ASTM sieves. The weight of aggregate retained in each sieve and pan placed at the bottom is recorded, as given in Column B of Table 1.
To determine the fineness modulus of...
Newtonian Fluid: Problem Solving01:18

Newtonian Fluid: Problem Solving

Newtonian fluids exhibit a constant viscosity, meaning their shear stress and shear strain rate are directly proportional. This property ensures a predictable and stable response to applied forces, maintaining a linear relationship between force and flow. Examples include water, air, and light oils, consistently demonstrating this proportional behavior regardless of external conditions.
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...
Uniform Depth Channel Flow01:27

Uniform Depth Channel Flow

Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...

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相关实验视频

Updated: May 10, 2026

Controlled Synthesis and Fluorescence Tracking of Highly Uniform Poly(N-isopropylacrylamide) Microgels
11:34

Controlled Synthesis and Fluorescence Tracking of Highly Uniform Poly(N-isopropylacrylamide) Microgels

Published on: September 8, 2016

表面阴性统一性 表面阴性统一性

Andrea Pedrini1, Epifanio G Virga1

  • 1Università di Pavia, Dipartimento di Matematica, Via Ferrata 5, 27100 Pavia, Italy.

Physical review. E
|February 20, 2026
PubMed
概括
此摘要是机器生成的。

这项研究确定了负曲率表面上所有均的阴性磁场. 这些场被特定的地测系统并行传输,为条纹景观提供了通用解决方案.

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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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Forming, Confining, and Observing Microtubule-Based Active Nematics
08:37

Forming, Confining, and Observing Microtubule-Based Active Nematics

Published on: January 13, 2023

相关实验视频

Last Updated: May 10, 2026

Controlled Synthesis and Fluorescence Tracking of Highly Uniform Poly(N-isopropylacrylamide) Microgels
11:34

Controlled Synthesis and Fluorescence Tracking of Highly Uniform Poly(N-isopropylacrylamide) Microgels

Published on: September 8, 2016

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
06:24

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

Forming, Confining, and Observing Microtubule-Based Active Nematics
08:37

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Published on: January 13, 2023

科学领域:

  • 不同几何学微分几何学
  • 纳马特字段 纳马特字段 纳马特字段 纳马特字段
  • 表面理论 表面理论

背景情况:

  • 统一的阴性场的存在需要具有恒定的负高斯曲率的表面.
  • 之前的工作确立了对均阴性场的负曲率的必要性.

研究的目的:

  • 在光滑表面上确定所有可能的均阴性场.
  • 描述这些场的几何性质及其与地表测量学的关系.

主要方法:

  • 分析沿着地测系统的平行运输 (Levi-Civita连接).
  • 在贝尔特拉米的伪球上对均场的明确计算.
  • 应用思维定理对等方度来概括发现.

主要成果:

  • 所有统一的内马特场都是由特定的"统一"的地测系统平行运输的.
  • 对于任何地理测量仪,存在两个独特的统一地理测量仪系统 (左和右).
  • 对于贝尔特拉米的伪球,发现了对均场的明确解决方案.

结论:

  • 几何框架为允许的表面上的均阴性场提供了通用的解决方案.
  • 这些场的存在表明了流体膜中概括的内在弹性能量的新定义.
  • 这种几何结果在流体动力学和材料科学中具有潜在的应用.