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相关概念视频

Propagation of Uncertainty from Systematic Error01:10

Propagation of Uncertainty from Systematic Error

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The atomic mass of an element varies due to the relative ratio of its isotopes. A sample's relative proportion of oxygen isotopes influences its average atomic mass. For instance, if we were to measure the atomic mass of oxygen from a sample, the mass would be a weighted average of the isotopic masses of oxygen in that sample. Since a single sample is not likely to perfectly reflect the true atomic mass of oxygen for all the molecules of oxygen on Earth, the mass we obtain from this...
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Propagation of Uncertainty from Random Error00:59

Propagation of Uncertainty from Random Error

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An experiment often consists of more than a single step. In this case, measurements at each step give rise to uncertainty. Because the measurements occur in successive steps, the uncertainty in one step necessarily contributes to that in the subsequent step. As we perform statistical analysis on these types of experiments, we must learn to account for the propagation of uncertainty from one step to the next. The propagation of uncertainty depends on the type of arithmetic operation performed on...
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Uncertainty: Overview00:59

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In analytical chemistry, we often perform repetitive measurements to detect and minimize inaccuracies caused by both determinate and indeterminate errors. Despite the cares we take, the presence of random errors means that repeated measurements almost never have exactly the same magnitude. The collective difference between these measurements - observed values - and the estimated or expected value is called uncertainty. Uncertainty is conventionally written after the estimated or expected value.
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The stability of equilibrium configurations is an important concept in physics, engineering, and other related fields. In simple terms, it refers to the tendency of an object or system to return to its equilibrium position after being disturbed. The stability of an equilibrium configuration can be analyzed by considering the potential energy function of the system and examining its behavior near the equilibrium point.
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The Uncertainty Principle04:08

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Werner Heisenberg considered the limits of how accurately one can measure properties of an electron or other microscopic particles. He determined that there is a fundamental limit to how accurately one can measure both a particle’s position and its momentum simultaneously. The more accurate the measurement of the momentum of a particle is known, the less accurate the position at that time is known and vice versa. This is what is now called the Heisenberg uncertainty principle. He...
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Understanding the stability of equilibrium configurations is a fundamental part of mechanical engineering. In any system, there are three distinct types of equilibrium: stable, neutral, and unstable.
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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在非CO的不确定性.

Mathijs Harmsen1,2, Charlotte Tabak3, Lena Höglund-Isaksson4

  • 1PBL Netherlands Environmental Assessment Agency, Bezuidenhoutseweg 30, NL-2594, AV, The Hague, the Netherlands. mathijs.harmsen@pbl.nl.

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概括
此摘要是机器生成的。

缓解非二氧化碳温室气体 (NCGG) 对气候政策至关重要,但NCGG缓解的不确定性对实现"巴黎协定"目标产生潜在影响. 这项研究量化了NCGG缓解不确定性,揭示了气候目标的挑战.

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科学领域:

  • 气候科学 气候科学
  • 环境政策 环境政策
  • 温室气体排放量 温室气体排放量

背景情况:

  • 减缓非二氧化碳温室气体 (NCGG) 对实现全球气候政策目标,包括"巴黎协定"目标至关重要.
  • 对NCGG减缓潜力的重大不确定性对气候建模和政策制定构成挑战.
  • 准确评估NCGG缓解对于评估限制全球变暖的可行性至关重要.

研究的目的:

  • 系统地估计非二氧化碳温室气体减排的总不确定性.
  • 开发"乐观"",默认"和"悲观"的长期NCGG边际减排成本 (MAC) 曲线.
  • 评估NCGG缓解不确定性对全球气候目标的影响.

主要方法:

  • 对NCGG缓解选择进行了全面的文献审查.
  • 边际减产成本 (MAC) 曲线是为乐观的,违约的和悲观的场景开发的.
  • 分析了MAC不确定性对气候目标,碳预算和政策成本的影响.

主要成果:

  • 在悲观的MAC假设下,1.5度的气候目标是无法实现的.
  • 在高排放场景下,2度的气候目标可能无法实现.
  • 对于2°C的情况,MAC的不确定性导致相对NCGG减少的预计范围为40-58%,碳预算的CO2不确定性为±120 Gt,政策成本的不确定性为±16%.

结论:

  • NCGG减缓的不确定性对实现气候政策目标的可行性产生重大影响.
  • 大部分的MAC不确定性反映了技术限制,而不仅仅是人类创新的差距.
  • 解决NCGG缓解不确定性对于有效的气候变化缓解战略至关重要.