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The concept of work involves force and displacement; meanwhile, the work-energy theorem relates the net work done on a body to the difference in its kinetic energy, calculated between two points on its trajectory. While none of these quantities or relations involves time explicitly, we know that the time available to accomplish work is often just as important as the amount of work itself. For example, sprinters in a race may have achieved the same velocity at the finish, therefore,...
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Instantaneous power is important in electrical circuits, mainly when dealing with sinusoidal input. Instantaneous power, denoted as p(t), results from the multiplication of the instantaneous voltage (v(t)) across an element and the instantaneous current (i(t)) flowing through it. This relationship adheres to the passive sign convention and represents a fundamental principle in electrical engineering.
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Complex Power01:14

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Power engineers have introduced the concept of complex power to determine the cumulative effect of parallel loads. This idea plays a crucial role in power analysis because it encompasses all the details related to the power consumed by a specific load.
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Electric power is the product of current and voltage, represented in units of joules per second, or watts. For example, cars often have one or more auxiliary power outlets with which you can charge a cell phone or other electronic devices. These outlets may be rated at 20 amps and 12 volts, so that the circuit can deliver a maximum power of 240 watts. Consider a 25 Watt bulb and a 60 Watt bulb. The conversion of electrical energy produces heat and light, while the kinetic energy lost by the...
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In definite integration, Riemann sums approximate the area under a curve by dividing it into subintervals and summing the areas of rectangles. When these approximations follow predictable numerical patterns, such as arithmetic or polynomial sequences, sum formulas offer a more efficient and accurate way to compute the result. In particular, the sum of consecutive integers, squares, and cubes plays an essential role in simplifying these calculations, especially when dealing with uniform...
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Fabrication of Three-dimensional Paper-based Microfluidic Devices for Immunoassays
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Dispositivos microfluídicos basados en papel: una estrategia potente para la detección rápida

Xin Liu1, Weimin Xu1, Haowen Jiang1

  • 1School of Printing and Packaging Engineering, Beijing Institute of Graphic Communication, Beijing 102600, China.

Micromachines
|January 28, 2026
PubMed
Resumen
Este resumen es generado por máquina.

Los dispositivos analíticos microfluídicos basados en papel (μPADs) ofrecen una solución portátil y de bajo costo para la detección rápida in situ de enfermedades, contaminantes ambientales y toxinas alimentarias. Esta revisión destaca sus avances y aplicaciones.

Palabras clave:
monitoreo ambientalseguridad alimentariamicrofluídica basada en papeldiagnóstico en el punto de atencióndetección rápida

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Área de la Ciencia:

  • Química Analítica
  • Ingeniería Biomédica
  • Ciencia Ambiental

Sus antecedentes:

  • La salud mundial se ve amenazada por enfermedades, contaminación y problemas de seguridad alimentaria.
  • Los métodos de detección actuales son precisos pero requieren equipos y experiencia complejos, lo que dificulta la aplicación in situ.
  • Existe una necesidad crítica de herramientas analíticas sensibles, rápidas y portátiles.

Objetivo del estudio:

  • Revisar los avances recientes en dispositivos analíticos microfluídicos basados en papel (μPADs).
  • Discutir las técnicas de fabricación, la selección de materiales y los mecanismos de detección de los μPADs.
  • Evaluar las aplicaciones de los μPADs en diagnóstico médico, análisis ambiental y seguridad alimentaria.

Principales métodos:

  • Descripción general del desarrollo de materiales basados en papel y técnicas de fabricación.
  • Discusión sobre la selección de materiales y los principios de detección para μPADs.
  • Evaluación de las aplicaciones de μPADs en diversos campos.

Principales resultados:

  • Los μPADs ofrecen respeto por el medio ambiente, flexibilidad y bajo costo.
  • Se han logrado avances significativos en las aplicaciones de los μPADs para pruebas médicas, ambientales y de seguridad alimentaria.
  • La revisión detalla las opciones de materiales y las estrategias de detección relevantes para el rendimiento de los μPADs.

Conclusiones:

  • Los μPADs son una tecnología prometedora para diagnósticos y monitoreo accesibles in situ.
  • Se necesita más investigación para abordar los desafíos actuales y explorar las perspectivas futuras.
  • Los μPADs representan un avance significativo en los dispositivos analíticos portátiles.