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相关概念视频

X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...
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Interference and Diffraction02:18

Interference and Diffraction

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Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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Rate-Determining Steps03:08

Rate-Determining Steps

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Relating Reaction Mechanisms
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
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Computed Tomography01:10

Computed Tomography

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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Steps in Outbreak Investigation01:18

Steps in Outbreak Investigation

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In the ever-evolving field of public health, statistical analysis serves as a cornerstone for understanding and managing disease outbreaks. By leveraging various statistical tools, health professionals can predict potential outbreaks, analyze ongoing situations, and devise effective responses to mitigate impact. For that to happen, there are a few possible stages of the analysis:
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Steps in the Modeling Process01:14

Steps in the Modeling Process

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Albert Bandura's theory of observational learning identifies four critical processes: attention, retention, motor reproduction, and reinforcement or motivation.
Attention is the first necessary component for observational learning. It involves focusing on what the model is doing and saying. For example, if you decide to take a drawing class to enhance your skills, you need to pay close attention to the instructor's words and hand movements. The characteristics of the model significantly...
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相关实验视频

Updated: Feb 1, 2026

High Pressure Single Crystal Diffraction at PX^2
11:32

High Pressure Single Crystal Diffraction at PX^2

Published on: January 16, 2017

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分样单步弗雷内尔衍射用于高分辨率全息图的高效计算.

Kazuma Mori, Fan Wang, Tomoyoshi Ito

    Optics letters
    |January 30, 2026
    PubMed
    概括

    这项研究引入了一种用于高效大规模衍射计算的新方法. 它结合了弗雷内尔衍射和亚样本的FFT,以快速计算高分辨率的结果,而不需要伪造文物.

    科学领域:

    • 光学和光子学 在光学和光子学.
    • 计算成像技术的成像

    背景情况:

    • 在光学应用中对大规模衍射计算的需求日益增加,如全息.
    • 由于高分辨率数据和显示设备之间的分辨率不匹配,传统方法面临计算挑战.
    • 减少样本以降低成本可能会导致伪造文物.

    研究的目的:

    • 从高分辨率数据中开发出一种快速且存储效率高的方法,用于从高分辨率数据中计算所需分辨率的衍射结果.
    • 解决与传统衍射计算相关的计算成本和别名问题.
    • 为了能够准确地验证低分辨率设备上的高分辨率衍射模式.

    主要方法:

    • 实现单步弗雷内尔衍射计算的实施.
    • 与子样本快速里埃转换 (FFT) 算法的集成.
    • 旨在避免计算过程中的异名噪声的方法.

    主要成果:

    • 实现了对衍射结果的快速和内存高效的计算.
    • 从高分辨率数据中成功计算了所需分辨率的衍射.
    • 避免伪造文物,确保结果的准确性.

    结论:

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  • 拟议的方法为大规模的衍射计算提供了显著的改进.
  • 它为全息应用提供了计算效率高,准确的解决方案.
  • 允许在标准显示设备上实际使用高分辨率衍射数据.