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Types of Radioactivity03:23

Types of Radioactivity

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The most common types of radioactivity are α decay, β decay, γ decay, neutron emission, and electron capture.
Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:
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Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

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In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

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Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
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Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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X-ray Crystallography02:18

X-ray Crystallography

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
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Atomic Absorption Spectroscopy: Interference01:25

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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
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Scattering And Absorption of Light in Planetary Regoliths
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アブ・イニシオ アルファ散布

Serdar Elhatisari1, Dean Lee2, Gautam Rupak3

  • 1Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, D-53115 Bonn, Germany.

Nature
|December 4, 2015
PubMed
まとめ
この要約は機械生成です。

アルファ-アルファ散乱の 初期計算を 格子モンテカルロシミュレーションで行います この方法は,恒星の核合成と関連する核反応を理解するための計算効率の良いアプローチを提供します.

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Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering
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Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering

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関連する実験動画

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Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering
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科学分野:

  • 核物理学
  • 天体物理学
  • 計算物理

背景:

  • アルファ粒子とアルファのような核は恒星の核合成において極めて重要であり,元素の豊富さや超新星モデルに影響を与えます.
  • アルファ散乱と捕獲の正確な計算は,背景と共鳴散乱の貢献を理解するために不可欠です.
  • 以前の最初の原理の計算は,指数関数的なスケーリングのため,計算上では非現実的でした.

研究 の 目的:

  • アルファ-アルファ分散を計算するための効率的なab initio方法を開発する.
  • 恒星の進化と超新星にとって重要な核反応の正確な予測を可能にします
  • 原子とハドロン系にこれらの方法の適用を調査する.

主な方法:

  • 低エネルギー核相互作用のための格子モンテカルロシミュレーションと格子効果フィールド理論を使用した.
  • アディアバティック・プロジェクション・メソッドを用いて 8 体のシステムを 2 クラスタのシステムに簡素化しました
  • 計算効率と有利なスケーリングのための補助フィールドモンテカルロシミュレーションを活用した.

主要な成果:

  • s波とd波の散乱に対する格子結果と実験段階のシフトとの間に有望な合意が達成された.
  • 粒子数による計算操作の およそ二次的なスケーリングを示した.
  • アルファ-アルファ分散の初期計算のための実行可能な計算フレームワークを確立した.

結論:

  • 開発されたab initio方法は,アルファ-アルファ分散に効率的で正確なアプローチを提供します.
  • 炭素や酸素のような重い原子核の アルファ散乱と捕獲を計算する.
  • 方法論は超冷たい原子の少量体システムと,格子量子染色学によるハドロンシステムに適応可能である.