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Related Concept Videos

Control System Problem01:21

Control System Problem

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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.
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Biopharmaceutical studies constitute a vital field aiming to enhance drug delivery methods and refine therapeutic approaches, drawing upon diverse interdisciplinary knowledge. In research methodologies, the choice between controlled and non-controlled studies significantly influences the study's reliability and accuracy.
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Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
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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.
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Controller configurations are crucial in a car's cruise control system because they manage speed over time to maintain a consistent pace regardless of road conditions, thereby meeting design goals. In traditional control systems, fixed-configuration design involves predetermined controller placement. System performance modifications are known as compensation.
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PID Controller

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Proportional-Integral-Derivative (PID) controllers are widely used in various control systems to enhance stability and performance. In a thermostat, it adjusts heating or cooling based on the temperature difference between the actual and desired levels. They are often used in automotive speed systems, effectively managing sudden speed changes while maintaining a constant speed under varying conditions. On the other hand, PI controllers, commonly employed in voltage regulation, enhance stability...
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Updated: Jan 23, 2026

Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
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Turn Nonweldable Ni-Superalloys Printable and Microstructurally Controllable.

Zhaowei Wang1, Fei Liu2, Shubo Gao3

  • 1State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|January 22, 2026
PubMed
Summary

3D printing offers new ways to manufacture and repair nickel-based superalloys for high-temperature applications. Overcoming challenges like cracking and microstructure control is key to realizing the full potential of additive manufacturing for these critical aerospace components.

Keywords:
Ni‐based superalloysadditive manufacturingcracking suppressionhierarchical microstructuremechanical properties

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Area of Science:

  • Materials Science
  • Additive Manufacturing
  • Metallurgy

Background:

  • Nickel-based superalloys are vital for high-temperature applications in aerospace and power generation.
  • Traditional manufacturing methods are costly and time-intensive, and components are susceptible to damage.
  • Additive manufacturing (3D printing) presents a promising alternative for manufacturing, remanufacturing, and repair.

Purpose of the Study:

  • To review recent studies on the fundamental mechanisms hindering 3D printing of nickel-based superalloys.
  • To identify strategies for improving printability and microstructural control.
  • To highlight progress, challenges, and future opportunities in this field.

Main Methods:

  • Review of recent literature on 3D printing of nickel-based superalloys.
  • Analysis of fundamental mechanisms: microsegregation, melt pool dynamics, defects, and stresses.
  • Examination of strategies: printing parameter optimization and heat treatments.

Main Results:

  • Key challenges include crack formation, grain structure control, and precipitate optimization.
  • Understanding microsegregation and melt pool behavior is crucial.
  • Optimized printing parameters and heat treatments enhance printability and microstructure.

Conclusions:

  • Significant progress has been made in 3D printing nickel-based superalloys.
  • Further research is needed to overcome persistent challenges in crack prevention and microstructural control.
  • Additive manufacturing holds great promise for high-performance superalloy components, exemplified by turbine blade fabrication.