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Blinding01:11

Blinding

2.6K
Blinding is a commonly used method of not telling participants which treatment a subject is receiving. Blinding is a critical part of a randomized control trial or RCT. It reduces the bias that affects the results. In an RCT, blinding is used in the form of a placebo. A placebo effect occurs when untreated subjects falsely believe they have received the treatment and report improved symptoms. A placebo or a dummy treatment is administered to subjects to negate the bias caused by such an effect.
2.6K
Mutations01:35

Mutations

39.6K
Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
39.6K
Radiation: Applications01:17

Radiation: Applications

1.2K
The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
1.2K
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

3.2K
Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
3.2K
Hot Weather Concreting01:20

Hot Weather Concreting

122
Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing.
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...
122
Photoreceptors and Plant Responses to Light02:00

Photoreceptors and Plant Responses to Light

23.7K
Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
23.7K

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相关实验视频

Updated: Sep 4, 2025

Measuring the Behavioral Effects of Intraocular Scatter
05:10

Measuring the Behavioral Effects of Intraocular Scatter

Published on: February 18, 2021

3.5K

在太阳的光中

Scott S Sheppard1

  • 1Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC 20015, USA.

Science (New York, N.Y.)
|July 21, 2022
PubMed
概括

夜小行星搜索发现了接近太阳的小行星. 这些发现位于与金星相似的轨道上, 扩大了我们对太阳系内部物体的理解.

科学领域:

  • 太阳系探索
  • 探测小行星
  • 近太阳物体研究

背景情况:

  • 内部太阳系,特别是靠近太阳的区域,仍然难以观察.
  • 了解这些地区的小行星数量对于行星防御和太阳系形成研究至关重要.

研究的目的:

  • 在黄昏时检测太阳系内部的小行星的可行性.
  • 识别和描述位于金星轨道附近的小行星.

主要方法:

  • 使用专门的望远镜和观测技术在平民黄昏期间寻找小行星.
  • 使用天文测量和轨道测定来证实小行星的发现.

主要成果:

  • 几颗小行星在接近金星的轨道上被成功探测到.
  • 这些发现证明了黄昏调查在发现近太阳小行星方面的有效性.

结论:

  • 黄昏观测是发现太阳系内难地区小行星的可行方法.
  • 发现这些食金星的小行星有助于对潜在危险的近地天体进行统计.

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In Situ Monitoring of the Accelerated Performance Degradation of Solar Cells and Modules: A Case Study for CuIn,GaSe2 Solar Cells
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