Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Carbon-dioxide Fixation01:28

Carbon-dioxide Fixation

1
Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
1
Adiabatic Processes for an Ideal Gas01:18

Adiabatic Processes for an Ideal Gas

3.0K
When an ideal gas is compressed adiabatically, that is, without adding heat, work is done on it, and its temperature increases. In an adiabatic expansion, the gas does work, and its temperature drops. Adiabatic compressions actually occur in the cylinders of a car, where the compressions of the gas-air mixture take place so quickly that there is no time for the mixture to exchange heat with its environment. Nevertheless, because work is done on the mixture during the compression, its...
3.0K
Molecular Models02:00

Molecular Models

37.9K
Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
37.9K
Molecular Comparison of Gases, Liquids, and Solids02:26

Molecular Comparison of Gases, Liquids, and Solids

40.6K
Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
40.6K
Variation of Atmospheric Pressure01:18

Variation of Atmospheric Pressure

2.1K
Change in atmospheric pressure with height is particularly interesting. The decrease in atmospheric pressure with increasing altitude is due to the decreasing gravitational force per unit area as we move away from the surface of the earth.
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
Let p(y) be the atmospheric pressure at...
2.1K
Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

373
Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
373

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Quantum dynamics of C<sub>10</sub>H<sup>-</sup> in the interstellar medium: inelastic collisions with He and formation reaction from the HC<sub>10</sub>H/H<sup>-</sup> reactants.

Physical chemistry chemical physics : PCCP·2025
Same author

Reconstruction of time-activity curves in molecular radiotherapy using a Bayesian unfolding.

Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB)·2025
Same author

Lithium inelastic cross-sections and their impact on micro and nano dosimetry of boron neutron capture.

Physics in medicine and biology·2024
Same author

Advances in Geant4 application in Physics, Medicine and Biology frontiers.

Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB)·2024
Same author

Search for Evidence of Baryogenesis and Dark Matter in B^{+}→ψ_{D}+p Decays at BABAR.

Physical review letters·2023
Same author

Electric Fields in Liquid Water Irradiated with Protons at Ultrahigh Dose Rates.

Physical review letters·2023

相关实验视频

Updated: Jun 6, 2025

Design and Synthesis of a Reconfigurable DNA Accordion Rack
07:44

Design and Synthesis of a Reconfigurable DNA Accordion Rack

Published on: August 15, 2018

7.0K

对大气应用的Geant4-DNA开发:N2,O2和CO2模型的实施.

F Nicolanti1, B Caccia2, A Cartoni3

  • 1Physics Dep., Sapienza U. of Rome, p.le Aldo Moro, 2, 00185, Rome, Italy; INFN, Sec. of Rome, p.le Aldo Moro, 2, 00185, Rome, Italy.

Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB)
|November 29, 2024
PubMed
概括

这项研究增强了Geant-DNA工具包的新模型,用于大气气体如,氧和二氧化碳中的电子分子相互作用,这对于了解宇宙射线对大气化学和气候的影响至关重要.

关键词:
大气层的离子化电子横截面的截面吉安特的4-DNA是一种DNA.蒙特卡洛模拟的蒙特卡洛模拟粒子轨道结构 粒子轨道结构

更多相关视频

On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes
07:49

On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes

Published on: August 5, 2016

10.7K
Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
12:11

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

Published on: April 8, 2020

8.1K

相关实验视频

Last Updated: Jun 6, 2025

Design and Synthesis of a Reconfigurable DNA Accordion Rack
07:44

Design and Synthesis of a Reconfigurable DNA Accordion Rack

Published on: August 15, 2018

7.0K
On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes
07:49

On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes

Published on: August 5, 2016

10.7K
Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
12:11

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

Published on: April 8, 2020

8.1K

科学领域:

  • 大气化学 大气化学
  • 计算物理 计算物理
  • 辐射物理 辐射物理

背景情况:

  • 宇宙射线电离大气气体,影响化学反应和大气组成.
  • 准确的粒子-分子相互作用模型对于量化这些效应至关重要.
  • 巨大的DNA工具包正在被扩展到大气科学应用中.

研究的目的:

  • 为了扩展Geant-DNA工具包,对大气分子进行验证的电子冲击相互作用模型.
  • 为了结合二氧化碳的电子截面,这是一个关键的温室气体.
  • 为了能够对大气中的离子-分子反应进行定量分析.

主要方法:

  • 对 (N2) 和氧 (O2) 的电子冲击相互作用模型的扩展验证,最大为10 MeV.
  • 引入了二氧化碳 (CO2) 的新电子截面.
  • 在Geant4-DNA工具包中实现了这些横截面模型,并使用制动力和距离模拟来验证它们.

主要成果:

  • 不同的截面与分析计算和N2,O2和CO2的文献数据有很好的一致性.
  • 对N2,O2,CO2和空气的制动功率和续航里程的模拟证明了对ESTAR数据库参考数据的6%的一致性.
  • 在Geant4-DNA中成功实施和验证了新模型.

结论:

  • 实施的N2,O2和CO2的横截面模型现在可以在Geant4-DNA工具包中获得.
  • 这一进步对于对大气中的离子反应化学网络进行定量研究至关重要.
  • 该工具包可以更好地评估电离对大气化学和气候影响的影响.