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Videos de Conceptos Relacionados

Speed of Sound in Gases01:08

Speed of Sound in Gases

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The speed of sound in a gaseous medium depends on various factors. Since gases constitute molecules that are free to move, they are highly compressible. Hence, sound waves travel slowly through gases. Thermodynamics helps us understand the relationship between pressure, volume, and temperature of gases, thus, the speed of sound in an ideal gas can be determined using the laws of thermodynamics. At the same time, Newton's laws of motion and the continuity equation of fluid dynamics also come...
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Deriving the Speed of Sound in a Liquid01:09

Deriving the Speed of Sound in a Liquid

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As with waves on a string, the speed of sound or a mechanical wave in a fluid depends on the fluid's elastic modulus and inertia. The two relevant physical quantities are the bulk modulus and the density of the material. Indeed, it turns out that the relationship between speed and the bulk modulus and density in fluids is the same as that between the speed and the Young's modulus and density in solids.
The speed of sound in fluids can be derived by considering a mechanical wave...
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Speed of Sound in Solids and Liquids00:51

Speed of Sound in Solids and Liquids

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Most solids and liquids are incompressible—their densities remain constant throughout. In the presence of an external force, the molecules tend to restore to their original positions, which is only possible because the constituents interact. The interactions help the constituents pass on information about external disturbances, like sound waves. Therefore, sound waves travel faster through these media. Compared to solids, the constituents in a liquid are less tightly bound. Thus, sound...
4.0K
Korotkoff Sounds01:12

Korotkoff Sounds

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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.
During blood pressure assessment, inflating the cuff 30 millimeters of mercury above the patient's systolic blood pressure...
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Heart Sounds01:15

Heart Sounds

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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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Soundness of Cement01:17

Soundness of Cement

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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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A Virtual Machine Platform for Non-Computer Professionals for Using Deep Learning to Classify Biological Sequences of Metagenomic Data
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Un marco de aprendizaje profundo para la predicción del campo de velocidad del sonido oceánico en cuatro dimensiones

Yingjie Li1,2, Jixing Qin1,2, Shuanglin Wu1,2

  • 1College of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.

The Journal of the Acoustical Society of America
|February 12, 2026
PubMed
Resumen

Desarrollamos un nuevo modelo de aprendizaje profundo, Swin Transformer-UNet (ST-UNet), para la predicción precisa del campo de velocidad del sonido oceánico (SSF). Este modelo captura información espiotemporal cuatridimensional, mejorando significativamente la precisión de la predicción para aplicaciones submarinas.

Palabras clave:
aprendizaje profundovelocidad del sonido oceánicopredicción espiotemporalSwin TransformerUNetocéanografiacampo de velocidad del sonido

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Área de la Ciencia:

  • Oceanografía
  • Geofísica
  • Inteligencia Artificial

Sus antecedentes:

  • La predicción precisa de los campos de velocidad del sonido oceánico (SSF) es vital para la comunicación submarina, la exploración marina y la monitorización ambiental.
  • Los modelos de aprendizaje profundo muestran ser prometedores para la predicción de SSF, pero luchan con datos de alta dimensionalidad, lo que limita su extracción de características 3D y la captura incompleta de información espiotemporal.

Objetivo del estudio:

  • Desarrollar un novedoso modelo de aprendizaje profundo para la predicción 4D de SSF, capturando información espiotemporal completa.
  • Mejorar la precisión y las capacidades de los métodos existentes de predicción de SSF.

Principales métodos:

  • Se propuso el modelo Swin Transformer-UNet (ST-UNet), que integra las redes U-Net y Swin Transformer.
  • Se utilizó Swin Transformer para la extracción de características espiotemporales a través de la autoatención de múltiples cabezas.
  • Se empleó U-Net para refinar los detalles espaciales a través de la recuperación de características convolucionales.

Principales resultados:

  • El modelo ST-UNet logró un error cuadrático medio de 0,783 m/s para la predicción de SSF a 24 horas utilizando datos históricos de 7 días del Mar de China Meridional.
  • Demostró un rendimiento superior en comparación con las arquitecturas de referencia, con mejoras que oscilan entre el 33% y el 72%.

Conclusiones:

  • El modelo ST-UNet predice eficazmente los SSF 4D, superando a los métodos existentes.
  • Este avance tiene un potencial significativo para mejorar la comunicación submarina, la exploración de recursos marinos y la monitorización ambiental.