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相关概念视频

Biological Clocks and Seasonal Responses02:45

Biological Clocks and Seasonal Responses

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The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
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The Scientific Method03:50

The Scientific Method

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Chemistry is an empirical science. Scientists often pose questions to understand the chemistry in everyday life and seek answers to these questions. To achieve this, scientists follow a definitive series of steps that together make up the Scientific Method. This approach involves making observations, asking questions, building a hypothesis, conducting experiments, analyzing results, and forming a conclusion. 
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Censoring Survival Data01:09

Censoring Survival Data

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Survival analysis is a statistical method used to analyze time-to-event data, often employed in fields such as medicine, engineering, and social sciences. One of the key challenges in survival analysis is dealing with incomplete data, a phenomenon known as "censoring." Censoring occurs when the event of interest (such as death, relapse, or system failure) has not occurred for some individuals by the end of the study period or is otherwise unobservable, and it might have many different...
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Responses to Drought and Flooding02:41

Responses to Drought and Flooding

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Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
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Conservation of Declining Populations02:07

Conservation of Declining Populations

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Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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相关实验视频

Updated: Jul 23, 2025

Bringing the Visible Universe into Focus with Robo-AO
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科学家哀悼阿雷西博即将关闭

Claudia López Lloreda1

  • 1Arecibo, Puerto Rico.

Science (New York, N.Y.)
|July 13, 2023
PubMed
概括

作为一个历史性的天文台, 天文学家面临着工作的不确定性.

科学领域:

  • 天文学与天体物理学
  • 观测天文学

背景情况:

  • 一个著名的天文台的未来处于危险之中.
  • 这种情况影响了依赖它的天文学家的职业生涯.

研究的目的:

  • 突出了天文学家可能会失去的工作机会.
  • 强调天文台关闭对科学研究的影响.

主要方法:

  • 分析天文学中的就业趋势.
  • 具体观察所面临的财务和运营挑战的案例研究.

主要成果:

  • 在天文学家中存在很大的职业不安全.
  • 可能会损失重要的天文研究基础设施.

结论:

  • 迫切需要为观测站提供可持续的资金模式.
  • 支持天文学研究及其工作人员的重要性.

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