相关实验视频

Updated: Jun 18, 2025

Characterization of Thermal Transport in One-dimensional Solid Materials

Characterization of Thermal Transport in One-dimensional Solid Materials

Published on: January 26, 2014

无热颗粒材料的热性能无热颗粒材料的热性能

Kasra Farain¹, Daniel Bonn¹

¹Van der Waals-Zeeman Institute, Institute of Physics, <a href="https://ror.org/04dkp9463">University of Amsterdam</a>, Science Park 904, 1098XH Amsterdam, The Netherlands.

Physical review letters

|July 29, 2024

概括

干燥颗粒材料的老化,通常是无热的,导致产量压力的自发增加. 这种强化效应是随着时间的推移对数的,受温度的影响,类似于压力放松.

科学领域:

物理物理学物理
材料科学材料科学材料科学
类风病学类风病学类风病学

背景情况:

干粒状材料包括许多通过摩擦相互作用的粒子.
由于粒子大小,这些系统通常被认为是不热的.
了解这些材料的衰老机制对于预测它们的行为至关重要.

研究的目的:

为了研究停止颗粒流中的衰老现象.
孤立粒子间力量的演变及其对系统性质的影响.
为了探索衰老和压力放松在热颗粒状网络之间的关系.

主要方法:

阻止流动的颗粒物质的动态进入稳定状态的配置.
检查颗粒接触老化没有散装重排.
测量粒子间力量的变化和随着时间的推移而产生的应力.
在不同的时间和温度条件下分析压力放松行为.

主要成果:

在粒子接触处的老化导致系统的产量应力自发增加.
强化过程遵循对数时间的依赖.
增强的速度取决于温度.
压力放松表现出与衰老相似的时间和温度依赖.

结论:

无热颗粒网络表现出时间和温度依赖的衰老.
在这些系统中,衰老和压力放松可能具有共同的起源.
谷物接触尺度上的热分子过程控制着这些现象.

更多相关视频

Synthesis of Non-uniformly Pr-doped SrTiO3 Ceramics and Their Thermoelectric Properties

Synthesis of Non-uniformly Pr-doped SrTiO3 Ceramics and Their Thermoelectric Properties

Published on: August 15, 2015

Visualization of Failure and the Associated Grain-Scale Mechanical Behavior of Granular Soils under Shear using Synchrotron X-Ray Micro-Tomography

Visualization of Failure and the Associated Grain-Scale Mechanical Behavior of Granular Soils under Shear using Synchrotron X-Ray Micro-Tomography

Published on: September 29, 2019

相关概念视频

Thermal Sigmatropic Reactions: Overview

Thermal Sigmatropic Reactions: Overview

Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in...

Temperature and Thermal Equilibrium

Temperature and Thermal Equilibrium

Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...

Mechanisms of Heat Transfer I

Mechanisms of Heat Transfer I

Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.

Heat Capacities of an Ideal Gas II

Heat Capacities of an Ideal Gas II

For a system that undergoes a thermodynamic process at a constant volume condition, the heat absorbed is used only to increase the system's internal energy and not for doing any kind of work. While for a system undergoing a thermodynamic process under a constant pressure condition, the amount of heat absorbed is used not only for increasing the internal energy (as a function of temperature) but also for doing some work. The molar heat capacity is the amount of heat required to increase the...

Heat Capacities of an Ideal Gas III

Heat Capacities of an Ideal Gas III

The number of independent ways a gas molecule can move along straight line, rotate, and vibrate is called its degrees of freedom. Supposing d represents the number of degrees of freedom of an ideal gas, the molar heat capacity at constant volume of an ideal gas in terms of d is

Thermosensation

Thermosensation

Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...