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Related Concept Videos

PD Controller: Design01:26

PD Controller: Design

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In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
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Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

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Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
Consider the example of control of motor torque. Initially, a positive...
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Frequency-Domain Interpretation of PD Control01:24

Frequency-Domain Interpretation of PD Control

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Proportional-Derivative (PD) controllers are widely used in fan control systems to improve stability and performance. A fan control system can be effectively represented using a Bode plot to illustrate the impact of a PD controller through its transfer function. The Bode plot visually conveys how PD control modifies the fan's response across various frequencies, providing a frequency domain interpretation of the controller's behavior.
The proportional control gain, combined with the...
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Acid Suppressive Drugs for Peptic Ulcer Disease: Histamine H2-Receptor Antagonists01:28

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Histamine H2 receptors, which are intricately located on the basolateral membrane of parietal cells, play a crucial role in modulating gastric acid secretion. When released from enterochromaffin-like cells, histamine engages H2 receptors, initiating the cyclic AMP (cAMP) pathway. In this pathway, adenylyl cyclase converts ATP into cAMP, elevating intracellular cAMP levels. The activation of protein kinase A follows, stimulating the proton pump. This stimulation prompts the secretion of hydrogen...
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Pollination and Flower Structure

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Flowers are the reproductive, seed-producing structures of angiosperms. Typically, flowers consist of sepals, petals, stamens, and carpels. Sepals and petals are the vegetative flower organs. Stamens and carpels are the reproductive organs.  
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The Angiosperm Life Cycle02:39

The Angiosperm Life Cycle

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Plants have a life cycle split between two multicellular stages: a haploid stage—with cells containing one set of chromosomes—and a diploid stage—with cells containing two sets of chromosomes. The haploid stage is the gamete-producing gametophyte, and the diploid stage is the spore-producing sporophyte.
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Related Experiment Video

Updated: Feb 5, 2026

Identifying PD-1/PD-L1 Inhibitors with Surface Plasmon Resonance Technology
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Ultrasmall Grained Pd Nanopattern H2 Sensor.

Soo-Yeon Cho1,2, Hyunah Ahn1,2, Kangho Park1,2

  • 1Department of Chemical and Biomolecular Engineering (BK-21 Plus) , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , Korea.

ACS Sensors
|September 8, 2018
PubMed
Summary
This summary is machine-generated.

Precise control of palladium (Pd) grain size in H2 sensing channels is crucial. This study reveals novel dual-switching H2 sensing behavior in Pd nanopatterns, achieved through controlled grain interfaces and ultrasmall grain sizes.

Keywords:
gas sensorhydrogenpalladiumswitching responseα to β transition

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Sensing

Background:

  • Precise control of palladium (Pd) grain size and interfaces is vital for high-performance hydrogen (H2) sensing channels.
  • Previous methods were limited to grains >10 nm and showed monotonic responses, hindering detailed H2 detection.

Purpose of the Study:

  • To investigate the H2 sensing behavior of precisely grain-controlled Pd channels.
  • To demonstrate novel dual-switching response in Pd nanostructures for enhanced H2 detection.

Main Methods:

  • Fabrication of Pd nanopattern channels using low-energy plasma (Ar+) bombardment for ultrasmall grain size (5 nm) and narrow interface control (<2 nm).
  • Utilizing lithographic approaches for high-aspect-ratio and high-resolution morphological characteristics.

Main Results:

  • Observed unique dual-switching H2 sensing behavior with simultaneous positive and negative response variations within a single sensor.
  • Enabled simultaneous application of hydrogen-induced lattice expansion (HILE) and surface electron scattering mechanisms.
  • Achieved highly sensitive H2 detection (limit of detection: 2.5 ppm) without hysteresis or degradation.

Conclusions:

  • High-resolution control of Pd grain size and interfaces via Ar+ plasma bombardment is key to achieving dual-switching H2 sensing.
  • This approach overcomes limitations of previous methods, offering a new paradigm for H2 sensor design.
  • The developed Pd nanopattern channels demonstrate superior sensitivity and stability for H2 detection.