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相关概念视频

Calculating and Interpreting the Linear Correlation Coefficient01:11

Calculating and Interpreting the Linear Correlation Coefficient

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The correlation coefficient, r, developed by Karl Pearson in the early 1900s, is numerical and provides a measure of strength and direction of the linear association between the independent variable, x, and the dependent variable, y. Hence, it is also known as the Pearson product-moment correlation coefficient. It can be calculated using the following equation:
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Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
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Insulin: Dosing Regimen and Adverse Effects01:16

Insulin: Dosing Regimen and Adverse Effects

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Insulin-replacement therapy usually includes both long-acting insulin (basal) and short-acting insulin (to cater to postprandial needs). In a diverse group of type 1 diabetes patients, the average daily insulin dose is typically 0.5-0.7 units/kg body weight. However, obese patients and pubertal adolescents may need more due to insulin resistance.
The basal dose constitutes about 40%-50% of the total daily dose, with the rest as premeal insulin. The mealtime insulin dose should mirror...
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Calculating Standard Free Energy Changes02:49

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The free energy change for a reaction that occurs under the standard conditions of 1 bar pressure and at 298 K is called the standard free energy change. Since free energy is a state function, its value depends only on the conditions of the initial and final states of the system. A convenient and common approach to the calculation of free energy changes for physical and chemical reactions is by use of widely available compilations of standard state thermodynamic data. One method involves the...
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Gene Conversion02:08

Gene Conversion

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Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
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Calculating the Equilibrium Constant02:46

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The equilibrium constant for a reaction is calculated from the equilibrium concentrations (or pressures) of its reactants and products. If these concentrations are known, the calculation simply involves their substitution into the Kc expression.
For example, gaseous nitrogen dioxide forms dinitrogen tetroxide according to this equation:
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相关实验视频

Updated: Jan 28, 2026

Development of an Experimental Setup for the Measurement of the Coefficient of Restitution under Vacuum Conditions
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有效剂量的转换系数是使用具有FLUKA代码的人类形状网状参考幽灵计算的.

Davide Bozzato1, Francesco Cerutti2, Robert Froeschl3

  • 1CERN, Geneva, GE, SWITZERLAND.

Journal of radiological protection : official journal of the Society for Radiological Protection
|January 26, 2026
PubMed
概括
此摘要是机器生成的。

FLUKA蒙特卡洛代码现在使用ICRP出版物145网状幻影来计算有效剂量 (E). 这一进步支持准确的辐射防护剂量测量,用于未来国际辐射保护委员会建议.

关键词:
计算剂量计计算剂量计.蒙特卡洛辐射传输模拟辐射保护 辐射保护

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Fabrication and Characterization of Optical Tissue Phantoms Containing Macrostructure
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Fabrication and Characterization of Optical Tissue Phantoms Containing Macrostructure

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相关实验视频

Last Updated: Jan 28, 2026

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科学领域:

  • 医学物理 医学物理
  • 辐射剂量计 辐射剂量计
  • 计算物理 计算物理

背景情况:

  • 国际辐射保护委员会 (ICRP) 在145.出版物中介绍了新的基于网格的计算幻象.
  • 以前的剂量测量计算通常依赖于基于voxel的幻影 (例如,ICRP出版物116).
  • 精确的剂量测量对于在各种暴露场景中进行辐射保护至关重要.

研究的目的:

  • 为了实施ICRP出版物145网格幻象在FLUKA蒙特卡洛代码内.
  • 使用这些新的幻影计算从粒子流动到有效剂量 (E) 的转换系数.
  • 用先进的幻影模型验证FLUKA对有效剂量计算的能力.

主要方法:

  • 实施ICRP出版物145网格幻象在FLUKA. 的实施.
  • 计算各种粒子和能量转换系数的计算.
  • 在六种标准辐射几何体 (AP,PA,RLAT,LLAT,ROT,ISO) 下模拟广单能粒子束.
  • 结果与现有的voxel幻影数据 (ICRP 116) 和Geant4计算进行比较.

主要成果:

  • 在FLUKA成功实施了网状幻影.
  • 为各种粒子,能量和几何形状生成的转换系数的综合数据集.
  • 使用新的网状幻象,FLUKA证明了可靠的有效剂量计算.
  • 结果显示与其他验证的代码和以前的幻影数据有很好的一致性.

结论:

  • FLUKA蒙特卡洛代码是使用ICRP网状幻影进行有效剂量计算的验证.
  • 这种能力使FLUKA成为未来辐射保护建议的合适工具.
  • 预计在即将到来的ICRP指南中,网状幻象将取代voxel幻象.