Laser cooling and crystallization of electron-ion plasma is studied using the Brownian dynamics simulation technique and taking into consideration the interaction of ions with the electron subsystem. It has been shown that the nonlinear dependence of laser friction force on the velocity of ions has to be taken into account in order to simulate in an adequate manner the cooling dynamics and obtain a correct estimate for minimum temperatures. It has been found that times required for formation of an ordered ionic structure can be much longer than the typical plasma cooling time.
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http://dx.doi.org/10.1103/PhysRevE.80.056404 | DOI Listing |
Lasers Surg Med
January 2025
Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts, USA.
Objectives: This work highlights the methods used to develop a multi-pulse 1726 nm laser system combined with bulk air-cooling for selective sebaceous gland (SG) photothermolysis using thermal imaging and software algorithms. This approach enables treating to a desired tissue temperature and depth to provide a safe, effective, reproducible, and durable treatment of acne.
Methods: We designed and built a 1726 nm laser system with a 40 W maximum power output, a highly controlled air-cooling device, and a thermal camera in the handpiece, which permits real-time temperature monitoring of the epidermis.
PLoS One
January 2025
Department of Computer Engineering, Sharif University of Technology, Tehran, Iran.
Neuromorphic engineering has emerged as a promising avenue for developing brain-inspired computational systems. However, conventional electronic AI-based processors often encounter challenges related to processing speed and thermal dissipation. As an alternative, optical implementations of such processors have been proposed, capitalizing on the intrinsic information-processing capabilities of light.
View Article and Find Full Text PDFMicromachines (Basel)
November 2024
Department of Smart Manufacturing Engineering, Changwon National University, 20, Changwon-daehak-ro, Uichang-gu, Changwon-si 51140, Gyeongsangnam-do, Republic of Korea.
The high-entropy alloy (HEA) has recently attracted significant interest due to its novel alloy design concept and exceptional mechanical properties, which may exhibit either a single or multi-phase structure. Specifically, refractory high-entropy alloys (RHEA) composed of titanium, niobium, and nickel-based HEA demonstrate remarkable mechanical properties at elevated temperatures. Additive manufacturing (AM), specifically Direct Energy Deposition (DED), is efficient in fabricating high-entropy alloys (HEA) owing to its fast-cooling rates, which promote uniform microstructures and reduce defects.
View Article and Find Full Text PDFSci Rep
January 2025
Mechanical Engineering Department, University of South Florida, Tampa, FL, 33620, USA.
We report on discovering the homogeneous boiling within a liquid film residual resting in equilibrium over a melting ice block. This phenomenon was induced via longwave infrared radiation generated by a continuous wave [Formula: see text] laser. This investigation employed a high-speed camera and the Schlieren visualization technique.
View Article and Find Full Text PDFRev Sci Instrum
January 2025
School of Electrical and Electronic Engineering, The University of Manchester, Manchester M13 9PL, United Kingdom.
Carbon fiber reinforced polymers (CFRPs) are widely used in fields such as aviation and aerospace. However, subtle defects can significantly impact the material's service life, making defect detection a critical priority. In this paper, delamination defects in CFRP are detected using line laser infrared thermography, and a defect characterization algorithm that combines differential thermography with a frequency-domain filter is proposed.
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