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相关概念视频

Pharmaceutical Equivalents01:26

Pharmaceutical Equivalents

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As defined by regulatory standards, pharmaceutical equivalents require generic drug products to have identical dosage forms and chemically identical active pharmaceutical ingredients (APIs). They must adhere to compendial or applicable standards for potency, content uniformity, disintegration times, and dissolution rates. In the case of modified-release dosage forms, variations in drug content are permissible as long as the delivered amount remains consistent with the innovator drug product.
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Equivalent Capacitance01:19

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Multiple capacitors can be connected in a circuit in series or parallel configuration. When the capacitor combination is connected to a battery, the potential drop across each capacitor and the magnitude of charge stored in the individual capacitor depends on the type of the connection. The capacitor combination is replaced by a single equivalent capacitor that stores the same amount of charge as the combination for a given potential difference.
The following strategies are adopted to calculate...
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Equivalent Capacitance01:19

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From the study of resistive circuits, it is understood that employing a series-parallel combination serves as an effective strategy for simplifying circuits. Capacitors can be arranged within a circuit in one of two ways: a series configuration or a parallel configuration. The way these capacitors are connected to a battery will influence both the potential drop across each individual capacitor and the size of the charge that each capacitor can store. This is determined by the specific type of...
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Soundness of Cement01:17

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The soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create...
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Heart Sounds01:15

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Heart sounds are generated by the turbulence in blood flow due to the closing of heart valves. These sounds are best perceived slightly away from the valves, where the blood flow disseminates the sound.
Auscultation is the process of listening to these internal body sounds using a stethoscope. The heart produces four types of sounds, but only two—S1 and S2—can usually be heard with a stethoscope.
S1, also known as the "lub" sound, is caused by the closure of atrioventricular (A-V)...
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Korotkoff Sounds01:12

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Korotkoff sounds are the specific sounds heard while measuring blood pressure using a sphygmomanometer, typically with a stethoscope or a Doppler device. They are named after Russian physician Nikolai Korotkov, who first described them in 1905. These sounds correspond to turbulent blood flow in the artery as the blood pressure cuff is gradually released after inflation.
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适应性稀疏基础压缩等效源方法用于声场重建.

Yang Shen1,2, Chuan-Xing Bi1, Xiao-Zheng Zhang1

  • 1Institute of Sound and Vibration Research, Hefei University of Technology, Hefei 230009, People's Republic of China.

The Journal of the Acoustical Society of America
|January 27, 2026
PubMed
概括
此摘要是机器生成的。

本研究介绍了一种适应方法,用于使用稀疏表示重建声音场. 新的方法提高了在未知噪音源的识别时的准确性和稳定性,而无需事先的知识.

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科学领域:

  • 声学 声学 声学 声学
  • 信号处理 信号处理
  • 计算物理 计算物理

背景情况:

  • 压缩传感使得使用稀疏表示的声音场重建.
  • 过于完整的词典结合了不同类型的来源的基础.
  • 现有的方法难以选择合适的稀疏基,限制了重建的准确性.

研究的目的:

  • 开发一种可适应的稀疏基础压缩等效源方法.
  • 为了提高未知来源的声音场重建的准确性和稳定性.
  • 为了解决传统方法中固定稀疏基础选择的局限性.

主要方法:

  • 通过结合稀疏的基础构建一个过于完整的字典.
  • 引入关节稀疏性和低级别的限制.
  • 制定重建作为贝叶斯优化问题,促进稀疏性和低级结构.

主要成果:

  • 拟议的适应性方法有效地选择合适的稀疏基.
  • 与传统方法相比,实现了更高的重建准确性,特别是对于稀疏和组合源.
  • 在声场重建中表现出更高的稳定性.

结论:

  • 适应性稀疏基础方法提高了声音场重建的准确性和稳定性.
  • 它提供了一种实际的解决方案,用于识别噪声源,而无需事先了解噪声源.
  • 这种方法克服了压力传感应用中固定基础选择的局限性.