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Videos de Conceptos Relacionados

Production of Formed Elements01:34

Production of Formed Elements

Hemangioblasts are multipotent stem cells originating from the mesoderm. They give rise to hematopoietic stem cells (HSCs), which undergo hematopoiesis to produce all the formed elements of blood. This process is regulated by a complex network of hematopoietic growth factors, including transcription factors, growth factors, and cytokines. These factors stimulate the HSCs to divide and differentiate, though some HSCs remain undifferentiated to maintain a self-renewing pool.
Most HSCs commit to...
Mechanical Efficiency of Real Machines01:14

Mechanical Efficiency of Real Machines

The mechanical efficiency of a machine is a fundamental concept that describes how effectively a machine can convert input work into output work. According to this concept, the efficiency of a machine is equal to the ratio of the output work to the input work. An ideal machine, meaning a machine that has no energy losses, has an efficiency of one. This implies that the input work and the output work are equal.
However, in reality, no machine can be truly ideal, and all of them experience some...
Maximum Power Transfer01:16

Maximum Power Transfer

Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...
Cyclic Processes And Isolated Systems01:19

Cyclic Processes And Isolated Systems

A thermodynamic system with zero heat exchange and work is an isolated system. For these systems, the internal energy remains constant.
In the case of a non-isolated system, the change in the internal energy is zero only if the process is cyclic. A thermodynamic process is considered cyclic if the system undergoes a series of changes and returns to its initial state. 
Consider a cyclic process that returns to its initial state, undergoing a four-step process. The heat transfer along each path...
The Maximum Power Transfer Theorem01:20

The Maximum Power Transfer Theorem

Consider a linear AC Thevenin equivalent circuit connected to a load impedance.
The load connected draws the current, and the circuit delivers the power to the load. The alternating current flowing through the load is determined using the rectangular form of voltages, currents, network impedance, and load impedance. The average power delivered to the load is obtained from the product of the square of current and load resistance.

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Video Experimental Relacionado

Updated: Jul 11, 2026

Prescribed 3-D Direct Writing of Suspended Micron/Sub-micron Scale Fiber Structures via a Robotic Dispensing System
10:36

Prescribed 3-D Direct Writing of Suspended Micron/Sub-micron Scale Fiber Structures via a Robotic Dispensing System

Published on: June 12, 2015

Procesamiento de materiales: el poder de la escritura directa.

D B Chrisey

    Science (New York, N.Y.)
    |September 11, 2007
    PubMed
    Resumen

    Las tecnologías de escritura directa permiten la fabricación de estructuras a escala micrométrica sin máscara para la creación rápida de prototipos. Este enfoque facilita una fabricación más rápida y rentable de productos electrónicos, andamios de ingeniería de tejidos y biosensores.

    Área de la Ciencia:

    • Ciencia de los materiales Ciencia de los materiales.
    • Nanotecnología La nanotecnología es la nanotecnología.
    • Fabricación aditiva La fabricación aditiva es la fabricación de aditivos.

    Sus antecedentes:

    • Los enfoques de escritura directa construyen estructuras a escala micrométrica sin máscaras, lo que permite la creación rápida de prototipos.
    • Estas tecnologías son cruciales para el avance de la fabricación de componentes electrónicos, la ingeniería de tejidos y el desarrollo de biosensores.

    Objetivo del estudio:

    • Proporcionar una visión general de la investigación actual en tecnologías de escritura directa.
    • Para resaltar los aspectos de la ciencia de los materiales de estos métodos de fabricación.

    Principales métodos:

    • Revisión de las actuales tecnologías de escritura directa.
    • Centrarse en los principios y aplicaciones de la ciencia de los materiales.

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    Prescribed 3-D Direct Writing of Suspended Micron/Sub-micron Scale Fiber Structures via a Robotic Dispensing System
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    Laser-induced Forward Transfer of Ag Nanopaste

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    Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory
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    Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory

    Published on: March 7, 2018

    Principales resultados:

    • Los métodos de escritura directa permiten la fabricación precisa y sin máscara de las microestructuras.
    • Las aplicaciones abarcan la electrónica, medicina regenerativa y diagnóstico.

    Conclusiones:

    • Las tecnologías de escritura directa ofrecen ventajas significativas en velocidad y costo para la microfabricación.
    • La investigación continua en la ciencia de los materiales es clave para expandir las capacidades de los enfoques de escritura directa.