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相关概念视频

Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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The Evidence for Evolution02:55

The Evidence for Evolution

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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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Convergent Evolution01:54

Convergent Evolution

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Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
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The Quantum-Mechanical Model of an Atom02:45

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Eukaryotic Evolution01:24

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The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
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Synteny and Evolution02:31

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John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
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Trajectory Data Analyses for Pedestrian Space-time Activity Study
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通过想象时间演变的决定性量子轨迹.

Shivan Mittal1,2, Bin Yan1

  • 1Los Alamos National Laboratory, Theoretical Division, Los Alamos, New Mexico 87544, USA.

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概括
此摘要是机器生成的。

研究人员开发了一种确定性方法,以有效地准备量子轨迹,克服指数后选择障碍. 这一进步使单个量子轨迹物理学和依赖后选择的现象的实验探索成为可能.

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科学领域:

  • 量子力学就是量子力学.
  • 多体物理学的多体物理学.
  • 开放的量子系统是开放的.

背景情况:

  • 随机量子轨迹描述了开放系统的动态.
  • 个别轨迹包含物理信息,就像测量诱导的相位过渡一样.
  • 由于指数式后选择障碍,观察特定的轨迹是很困难的.

研究的目的:

  • 提出一种有效准备量子轨迹的方法.
  • 为了克服指数后选择障碍,观测轨迹依赖现象.
  • 为了使单个量子轨迹的实验研究.

主要方法:

  • 开发了一种使用虚构时间进化的确定主义方法.
  • 用多项式时间准备的量子轨迹.
  • 证明适用于特定类量的量子状态.

主要成果:

  • 成功地以决定性和高效的方式准备了量子轨迹.
  • 克服了指数式后选择障碍.
  • 表明所有量子轨迹的通用方法不存在.

结论:

  • 拟议的方法允许有效准备量子轨迹.
  • 能够对后选择依赖现象进行实验性研究.
  • 在个体轨迹水平上研究开放量子系统动态的新途径.