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相关概念视频

Accelerating Fluids01:17

Accelerating Fluids

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When a fluid is in constant acceleration, the pressure and buoyant force equations are modified. Suppose a beaker is placed in an elevator accelerating upward with a constant acceleration, a. In the beaker, assume there is a thin cylinder of height h with an infinitesimal cross-sectional area, ΔS.
The motion of the liquid within this infinitesimal cylinder is considered to obtain the pressure difference. Three vertical forces act on this liquid:
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Acceleration Vectors01:30

Acceleration Vectors

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In everyday conversation, accelerating means speeding up. Acceleration is a vector in the same direction as the change in velocity, Δv, therefore the greater the acceleration, the greater the change in velocity over a given time. Since velocity is a vector, it can change in magnitude, direction, or both. Thus acceleration is a change in speed or direction, or both. For example, if a runner traveling at 10 km/h due east slows to a stop, reverses direction, and continues their run at 10 km/h...
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Equilibrium Conditions for a Particle01:23

Equilibrium Conditions for a Particle

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When an object is in equilibrium, it is either at rest or moving with a constant velocity. There are two types of equilibrium: static and dynamic. Static equilibrium occurs when an object is at rest, while dynamic equilibrium occurs when an object is moving with a constant velocity. In both cases, there must be a balance of forces acting on the object.
To understand the concept of equilibrium, let us first consider the forces acting on an object. When different forces act on an object, they can...
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Principle of Linear Impulse and Momentum for a Single Particle01:20

Principle of Linear Impulse and Momentum for a Single Particle

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Linear momentum is a fundamental concept in physics that describes the motion of an object. It is a vector quantity, having a magnitude equal to the product of its mass and its velocity, and direction along the object's velocity. On the other hand, linear impulse, also known as momentum impulse, is a concept in physics related to the change in the linear momentum of an object. Impulse is a vector quantity defined as the product of force and the time over which the force is applied.
Delving...
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Maxwell-Boltzmann Distribution: Problem Solving01:20

Maxwell-Boltzmann Distribution: Problem Solving

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Individual molecules in a gas move in random directions, but a gas containing numerous molecules has a predictable distribution of molecular speeds, which is known as the Maxwell-Boltzmann distribution, f(v).
This distribution function f(v) is defined by saying that the expected number N (v1,v2) of particles with speeds between v1 and v2 is given by
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Model Approaches for Pharmacokinetic Data: Distributed Parameter Models01:06

Model Approaches for Pharmacokinetic Data: Distributed Parameter Models

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Pharmacokinetic models are mathematical constructs that represent and predict the time course of drug concentrations in the body, providing meaningful pharmacokinetic parameters. These models are categorized into compartment, physiological, and distributed parameter models.
The distributed parameter models are specifically designed to account for variations and differences in some drug classes. This model is particularly useful for assessing regional concentrations of anticancer or...
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相关实验视频

Updated: Jun 14, 2025

Image-based Lagrangian Particle Tracking in Bed-load Experiments
10:32

Image-based Lagrangian Particle Tracking in Bed-load Experiments

Published on: July 20, 2017

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GAD-PVI:一个基于粒子的通用加速动态重量变化推理框架.

Fangyikang Wang1, Huminhao Zhu1, Chao Zhang1

  • 1College of Computer Science and Technology, Zhejiang University, Hangzhou 310058, China.

Entropy (Basel, Switzerland)
|August 29, 2024
PubMed
概括

基于粒子的变量推理 (ParVI) 方法得到了新的通用加速动态重量基于粒子的变量推理 (GAD-PVI) 框架的增强. 在贝叶斯推理任务中,GAD-PVI实现了更快的融合和更低的近似误差.

科学领域:

  • 机器学习 机器学习
  • 计算统计学 计算统计学
  • 贝叶斯的推理是贝叶斯的推理.

背景情况:

  • 基于粒子的变量推理 (ParVI) 方法对于深度贝叶斯推理至关重要,有效地使用目标分布得分生成样本.
  • 现有的ParVI方法接近Wasserstein梯度流,用于细化粒子系统,最近的进展侧重于加速更新或动态重量调整.

研究的目的:

  • 在信息-费舍尔-拉奥空间中引入一个新的半哈密尔顿梯度流 (SHIFR流).
  • 提出基于粒子的通用加速动态重量变化推理 (GAD-PVI) 框架,这是第一个同时实现加速位置更新和动态重量调整的框架.

主要方法:

  • 开发了在一个新的信息-费舍尔-Rao空间中运行的SHIFR流.
  • 制定了GAD-PVI框架,该框架集成了加速位置更新和动态重量调整.
  • 确保GAD-PVI与各种不相似性和梯度流近似方法的兼容性.

主要成果:

  • 在实验评估中,GAD-PVI与最先进的方法相比显示出更快的趋同.
  • 拟议的框架在基于分数和基于样本的贝叶斯推理任务中减少了近似误差.
  • 当使用适当的不相似性时,GAD-PVI甚至在没有分析分数的情况下也成功生成了高质量的样本.
关键词:
贝叶斯抽样采用贝叶斯抽样方法概率梯度流量流的概率梯度流.变化推理推理是变化的推理.

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Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow
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Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow

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相关实验视频

Last Updated: Jun 14, 2025

Image-based Lagrangian Particle Tracking in Bed-load Experiments
10:32

Image-based Lagrangian Particle Tracking in Bed-load Experiments

Published on: July 20, 2017

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Author Spotlight: Streamlining Visual Dynamics to Simplify Molecular Dynamics Simulations Using Gromacs
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Author Spotlight: Streamlining Visual Dynamics to Simplify Molecular Dynamics Simulations Using Gromacs

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Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow
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Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow

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结论:

  • GAD-PVI框架代表了基于粒子的变量推理的重大进步.
  • 它提供同时加速和动态重量适应,在效率和准确性方面超过现有方法.
  • GAD-PVI扩大了ParVI的适用性,特别是在无法获得分析分数的场景中.