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相关概念视频

Block Diagram Reduction01:22

Block Diagram Reduction

158
The process of deriving the transfer function of a control system often involves reducing its block diagram to a single block. This simplification can be achieved through a series of strategic operations, including relocating branch points and comparators. These operations preserve the overall function of the system while allowing for easier manipulation and combination of blocks.
The first step in this process is the identification and relocation of a branch point. A branch point, where a...
158
High-Level and Low-Level Awareness01:19

High-Level and Low-Level Awareness

248
Controlled processes in human consciousness represent high-alert mental states where individuals deliberately focus their attention on achieving specific goals. Controlled processes can be seen in situations like mastering new technology, where a person might become so absorbed that they ignore surrounding distractions. Such processes involve selective attention, requiring one to concentrate on particular elements of experience while disregarding others. These are governed by executive...
248
The Delta-to-Delta Circuit01:17

The Delta-to-Delta Circuit

547
In a delta-delta configuration, the source and the load are connected in a delta manner, forming a closed loop that divides the network into three distinct phases. This configuration makes the phase voltages identical to line voltages. Assuming the sources are in positive sequence, the phase voltages can be expressed directly without having a neutral wire.
547
Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

158
Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass...
158
Differential Leveling01:12

Differential Leveling

137
Differential leveling is a precise method in surveying used to determine the elevation difference between two points. Its primary goal is to establish accurate vertical measurements to create level surfaces or grade lines critical for designing and constructing infrastructures such as roads, bridges, and buildings.The procedure for differential leveling begins with setting up and leveling the instrument at a point where the benchmark can be seen. The level rod is held on the benchmark (BM), and...
137
Three-Phase Voltages01:30

Three-Phase Voltages

217
A three-phase generator produces three voltages that are equal in magnitude but have a phase difference of 120 degrees. This identical magnitude and equal phase separated voltages are known as the balanced voltages and help to minimize power loss while ensuring a steady delivery of energy to connected loads. As voltage sources in a three-phase system can be configured in a wye or a delta formation, the loads connected to these systems can also be arranged in either configuration. This...
217

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Multi-step Variable Height Photolithography for Valved Multilayer Microfluidic Devices
10:18

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通过使用阶段划分的两个少数级别的DOE堆实现等价的多级别DOE.

Bowen Niu, Xingang Dai, Yanjun Hu

    Optics express
    |November 22, 2024
    PubMed
    概括

    这项研究引入了一种新的堆叠衍射光学元件 (DOE) 方法. 这种技术减少了多层DOE的制造复杂性和成本,实现了与传统方法相比的性能.

    科学领域:

    • 光学和光子学 在光学和光子学.
    • 衍射光学元件 (DOE) 是一种光学元件.
    • 光学工程是指光学工程.

    背景情况:

    • 多级DOE提供更广泛的应用,但在制造精度和成本方面面临挑战.
    • 高级DOE的直接制造是复杂而昂贵的.

    研究的目的:

    • 提出一个改进的堆叠DOE方法来实现多层次的DOE.
    • 为了降低多层DOE的制造成本和制造难度.

    主要方法:

    • 使用分相方法将t级DOE分解成堆叠的m级和n级DOE (其中t = n × m).
    • 拟议的方法是使用16级束形状DOE进行演示的,采用4级和4级 (或2级和8级) 堆叠的DOE实现.

    主要成果:

    • 堆叠的4x4级和2x8级DOE实现了分别3.69%和3.58%的变化系数 (CV),衍射效率为98.11%.
    • 性能指标可与单一的16级DOE相提并论.
    • 对堆叠元素的水平,垂直和角位移进行了容忍分析.

    结论:

    • 堆叠的DOE方法简化了多层DOE的制造.
    • 这种方法为先进光学元件的低成本和不那么复杂的制造提供了可行的解决方案.

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