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Osmoregulation in Fishes

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When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?

Kinematic Equations - I

Kinematic Equations - I

When an object moves with constant acceleration, the velocity of the object changes at a constant rate throughout the motion. The kinematic equations of motions are derived for such cases where the acceleration of the object is constant. The first kinematic equation gives an insight into the relationship between velocity, acceleration, and time. We can see, for example:

Kinematic Equations - II

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The second kinematic equation expresses the final position of an object in terms of its initial position, the distance traveled with the initial constant velocity, and the distance traveled due to a change in velocity. Similar to the first kinematic equation, this equation is also only valid when the acceleration is constant throughout the motion of an object.
Suppose a car merges into freeway traffic on a 200 m long ramp. If its initial velocity is 10 m/s and it accelerates at 2 m/s2, then the...

Kinematic Equations for Rotation

Kinematic Equations for Rotation

In mechanics, when one observes a rigid body in rotational motion with constant angular acceleration, it is possible to establish equations for its rotational kinematics. This process resembles how linear kinematics are dealt with in simpler motion studies.
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Rigid Body Equilibrium Problems - I

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A rigid body is said to be in static equilibrium when the net force and the net torque acting on the system is equal to zero. To solve for rigid body equilibrium problems, do the following steps.

Rigid Body Equilibrium Problems - II

Rigid Body Equilibrium Problems - II

A rigid body is in static equilibrium when the net force and the net torque acting on the system are equal to zero.
Consider two children sitting on a seesaw, which has negligible mass. The first child has a mass (m1) of 26 kg and sits at point A, which is 1.6 meters (r1) from the pivot point B; the second child has a mass (m2) of 32 kg and sits at point C. How far from the pivot point B should the second child sit (r2) to balance the seesaw?

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SpineWave: Aprovechamiento de la Cinemática Espinal Rígida-Flexible de Peces para Mejorar la Locomoción Robótica

Qu He^1,2, Weikun Li^2,3, Guangmin Dai^1,2

¹Zhejiang University, Hangzhou, China.

|February 4, 2026

Resumen

Los investigadores desarrollaron SpineWave, un novedoso pez robótico que combina partes rígidas con cumplimiento magnético para un movimiento submarino eficiente. Este diseño biomimético mejora la velocidad, la maniobrabilidad y el ahorro de energía para la exploración marina.

Palabras clave:

biomímesis optimización global evolutiva acoplamiento magnético columna vertebral rígida-flexible pez robótico locomoción submarina

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Área de la Ciencia:

Robótica
Biomimética
Ciencia de los materiales

Sus antecedentes:

La robótica blanda submarina enfrenta desafíos para equilibrar el cumplimiento con el control y la robustez.
Los peces robóticos existentes a menudo carecen de la adaptabilidad y la resiliencia necesarias para entornos del mundo real.

Objetivo del estudio:

Presentar SpineWave, un pez robótico híbrido blando-rígido.
Demostrar un enfoque novedoso para la locomoción submarina utilizando cumplimiento magnético pasivo y control optimizado.

Principales métodos:

Se utilizó una arquitectura híbrida blanda-rígida con vértebras impresas en 3D e imanes incrustados para el cumplimiento pasivo.
Se empleó la optimización global eficiente (EGO) de hardware en el bucle para ajustar un controlador de generador de patrones centrales (CPG).
Se probó el rendimiento de SpineWave en morfologías modulares.

Principales resultados:

Se logró un aumento del 38% en la velocidad de crucero y una reducción del 35% en el radio de giro.
Se demostró un ahorro de energía del 29% al explotar las estelas de vórtice.
Se mantuvo la propagación estable de la onda corporal y la tolerancia al impacto.

Conclusiones:

SpineWave es el primer robot pez en lograr un cumplimiento y robustez similares a los blandos utilizando una estructura rígida acoplada magnéticamente.
La combinación de cumplimiento magnético pasivo y optimización CPG basada en datos avanza la locomoción robótica blanda.
Presenta una plataforma modular tolerante a la presión para la monitorización y exploración ambiental.