scholarly journals Three-dimensional effect of high frequency vibration on convection in silicon melt

2020 ◽  
Vol 5 (12) ◽  
Author(s):  
Faiza Mokhtari ◽  
Slim Kaddeche ◽  
Daniel Henry ◽  
Samia Bouarab ◽  
Abdessamed Medelfef ◽  
...  
Keyword(s):  
High Frequency ◽  
Three Dimensional ◽  
High Frequency Vibration ◽  
Dimensional Effect ◽  
Silicon Melt

scholarly journals The effect of low-magnitude, high-frequency vibration on poly(ethylene glycol)-microencapsulated mesenchymal stem cells

2018 ◽  
Vol 9 ◽  
pp. 204173141880010 ◽  
Author(s):  
Sneha Mehta ◽  
Brooke McClarren ◽  
Ayesha Aijaz ◽  
Rabab Chalaby ◽  
Kimberly Cook-Chennault ◽  
...  
Keyword(s):  
Stem Cells ◽  
Mesenchymal Stem Cells ◽  
Ethylene Glycol ◽  
High Frequency ◽  
Three Dimensional ◽  
Poly Ethylene Glycol ◽  
Natural Sources ◽  
High Frequency Vibration ◽  
Poly Ethylene ◽  
Low Magnitude

Low-magnitude, high-frequency vibration has stimulated osteogenesis in mesenchymal stem cells when these cells were cultured in certain types of three-dimensional environments. However, results of osteogenesis are conflicting with some reports showing no effect of vibration at all. A large number of vibration studies using three-dimensional scaffolds employ scaffolds derived from natural sources. Since these natural sources potentially have inherent biochemical and microarchitectural cues, we explored the effect of low-magnitude, high-frequency vibration at low, medium, and high accelerations when mesenchymal stem cells were encapsulated in poly(ethylene glycol) diacrylate microspheres. Low and medium accelerations enhanced osteogenesis in mesenchymal stem cells while high accelerations inhibited it. These studies demonstrate that the isolated effect of vibration alone induces osteogenesis.

Image processing technology in high frequency vibration direction and amplitude measurement

2021 ◽  
pp. 1-8
Author(s):  
Xiaoping Huang ◽  
Zhongxin Wei ◽  
Fangyi Wen
Keyword(s):  
Image Processing ◽  
Fundamental Frequency ◽  
High Frequency ◽  
Search Algorithm ◽  
Three Dimensional ◽  
Calibration Method ◽  
Processing Technology ◽  
Vibration Direction ◽  
High Frequency Vibration ◽  
Image Processing Technology

In recent years, with the development of computer software and hardware and artificial intelligence technology, photoelectric imaging equipment has gradually developed in the direction of digitization and intelligence. This paper mainly studies the application of image processing technology in the measurement of high-frequency vibration direction and amplitude. According to the corresponding relationship between the vibration blur image and the still image in the frequency spectrum, the image is preprocessed. This article adopts the traditional camera calibration method, which uses a special standard template to calibrate the internal and external parameters of the camera. The three-dimensional search algorithm is used to analyze and compare the recognition images of the left and right cameras in each state, and finally calculate the internal and external parameters of the camera. The data shows that the fundamental frequency is about 4.9 Hz, and the fundamental frequency order basically fluctuates around 16. The calculated amplitudes are 0.89, 0.93 and 0.99μm, respectively. The results show that the image processing technology can restore image edge details to a certain extent, suppress noise, and effectively shorten the matching time between feature points.

Tool wear analysis in high-frequency vibration-assisted drilling of additive manufactured Ti6Al4V alloy

Wear ◽  
2021 ◽  
pp. 203814
Author(s):  
Marco Sorgato ◽  
Rachele Bertolini ◽  
Andrea Ghiotti ◽  
Stefania Bruschi
Keyword(s):  
Tool Wear ◽  
High Frequency ◽  
Ti6al4v Alloy ◽  
High Frequency Vibration ◽  
Wear Analysis
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