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相关概念视频

Stability of structures01:14

Stability of structures

In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
Control Systems01:10

Control Systems

Control systems are everywhere in contemporary society, influencing diverse applications from aerospace to automated manufacturing. These systems can be found naturally within biological processes, such as blood sugar regulation and heart rate adjustment in response to stress, as well as in man-made systems like elevators and automated vehicles. A control system is essentially a network of subsystems and processes that collaboratively convert specific inputs into desired outputs.
At the heart...
Mechanical Systems01:22

Mechanical Systems

Mechanical systems are analogous to to electrical networks where springs and masses play similar roles to inductors and capacitors, respectively. A viscous damper in mechanical systems functions similarly to a resistor in electrical networks, dissipating energy. The forces acting on a mass in such systems include an applied force in the direction of motion, counteracted by forces from the spring, a viscous damper, and the mass's acceleration. This interplay of forces is mathematically described...
Elements of Block Diagrams01:25

Elements of Block Diagrams

Block diagrams serve as a visual representation of the input-output relationships within a system. An illustrative example is a heating system, where the set temperature activates the furnace to warm the room to the desired level. Block diagrams are versatile, modeling linear systems through Laplace transform variables and nonlinear systems using time domain variables.
A block diagram typically includes essential elements such as comparators, blocks, and feedback loops. Each of these elements...
Relation between Mathematical Equations and Block Diagrams01:20

Relation between Mathematical Equations and Block Diagrams

In a spring-mass-damper system, the second-order differential equation describes the dynamic behavior of the system. When transformed into the Laplace domain under zero initial conditions, this equation can be effectively analyzed and manipulated. The transformation into the Laplace domain converts differential equations into algebraic equations, simplifying the process of isolating the output.
Control System Problem01:21

Control System Problem

In an open-loop system, such as a basic thermostat, the poles of the transfer function influence the system's response but do not determine its stability. However, when feedback is introduced to form a closed-loop system, such as an advanced thermostat that adjusts heating based on room temperature, stability is governed by the new poles of the closed-loop transfer function.
When forming a closed-loop system, issues can arise if the poles cross into the unstable region, leading to potential...

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相关实验视频

Updated: May 13, 2026

Microfabricated Post-Array-Detectors mPADs: an Approach to Isolate Mechanical Forces
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支柱阵列作为微生理系统的调节界面障碍.

Ishan Goswami1,2, Yongdeok Kim1,2,3, Gabriel Neiman1

  • 1Department of Bioengineering, University of California, Berkeley, CA, USA.

Communications engineering
|November 20, 2025
PubMed
概括

我们为微生理系统 (MPS) 开发了一种新的支柱阵列屏障. 这种可调节的接口精确地控制扩散,以便在工程组织中更好地进行药物查和疾病建模.

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Last Updated: May 13, 2026

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61:34

Microfabricated Post-Array-Detectors mPADs: an Approach to Isolate Mechanical Forces

Published on: October 1, 2007

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科学领域:

  • 生物医学工程 生物医学工程
  • 细胞生物学 细胞生物学
  • 材料科学 材料科学 材料科学

背景情况:

  • 像膜这样的传统微生理系统 (MPS) 屏障在孔隙大小一致性,制造复杂性和可扩展性方面存在局限性.
  • 现有的屏障设计缺乏可调性,阻碍了对微流体装置内的扩散和细胞行为的精确控制.

研究的目的:

  • 设计和制造一种新的圆柱阵列,作为微流体微生理系统 (MPS) 的调节界面屏障.
  • 通过精确控制毛孔大小,毛孔度和液压阻力来克服传统障碍的局限性.
  • 为了证明这种可调节屏障对工程生理学相关的微组织和药物查和疾病建模模型的有用性.

主要方法:

  • 制造一个圆柱阵列,可调节柱子尺寸.
  • 屏障性质的表征,包括毛孔大小,多孔度和液压阻力.
  • 心脏微组织的工程和一个异型模型与血管系统在MPS装置内.

主要成果:

  • 支柱阵列通过对支柱尺寸的简单修改来精确控制屏障属性.
  • 证明了与生理学相关的心脏微组织和血管化异型模型的成功工程.
  • 可调节的屏障有效地模仿体内扩散,并促进细胞聚合以形成组织.

结论:

  • 开发的支柱阵列作为微流体MPS的多功能和可调节的接口屏障.
  • 这项技术可以在药物查,透性研究和疾病建模中实现先进的应用,因为它允许与血管系统进行比较.
  • 可扩展和可调节的设计为创建更准确和更具预测性的体外模型提供了巨大的潜力.