Interference pattern of a cylindrical glass tube

1976 ◽  
Vol 44 (4) ◽  
pp. 387-388 ◽  
Author(s):  
W. C. Maddox ◽  
B. W. Koehn ◽  
F. H. Stout ◽  
D. A. Ball ◽  
R. L. Chaplin
Keyword(s):  
Interference Pattern ◽  
Glass Tube ◽  
Cylindrical Glass

scholarly journals I. On the molecular mobility of gases

1863 ◽  
Vol 12 ◽  
pp. 611-623 ◽  
Keyword(s):  
Molecular Mobility ◽  
Porous Plate ◽  
Glass Tube ◽  
Point Of View ◽  
Practical Point ◽  
Partial Separation ◽  
Plaster Of Paris ◽  
Cylindrical Glass ◽  
Mixed Gases ◽  
Diffusion Of Gases

The molecular mobility of gases is here considered in reference chiefly to the passage of gases, under pressure, through a thin porous plate or septum, and to the partial separation of mixed gases which can be effected, as will be shown, by such means. The investigation arose out of a renewed and somewhat protracted inquiry regarding the diffusion of gases (depending upon the same molecular mobility), and has afforded certain new results which may prove to be of interest in a theoretical as well as in a practical point of view. In the diffusiometer, as first constructed, a plain cylindrical glass tube, rather less than an inch in diameter and about ten inches in length, was simply closed at one end by a porous plate of plaster of paris, about one-third of an inch in thickness, and thus converted into a gas receiver.

Relationship of Pressure and Plasma Temperature in Plasma DC Glow Discharge

2014 ◽  
Vol 979 ◽  
pp. 293-296 ◽  
Author(s):  
Kanchaya Honglertkongsakul ◽  
Dusit Ngamrungroj
Keyword(s):  
Glow Discharge ◽  
Electron Temperature ◽  
Parallel Plate ◽  
Plasma Temperature ◽  
Optical Emission ◽  
Glass Tube ◽  
Nitrogen Pressure ◽  
Nitrogen Plasma ◽  
Dc Glow Discharge ◽  
Cylindrical Glass

The DC glow discharge of nitrogen gas was carried out by 5 kV DC power supply, which was used to bias voltage between two parallel plate electrodes in the cylindrical glass tube chamber. The distance between two parallel plate electrodes was about 37.5 cm. The voltage was applied on these electrodes between 800 V to 1400 V. The nitrogen pressure in the cylindrical glass tube chamber was controlled by rotary pump and vacuum value. Optical Emission Spectroscopy (OES) was used to investigate the local emissivity of nitrogen glow discharge in the range between 200 and 1,100 nm. The spatial distribution of reactive species was measured at different nitrogen pressures from 0.15-1.90 mbar. These measurements were obtained to analyze the electron temperature. The effect of different nitrogen pressures was studied on the electron temperature and the configuration of nitrogen plasma. In the result, it was found that the plasma column increased with increasing the nitrogen pressure. The electron temperature was less than 0.8 eV.

scholarly journals Acoustic manipulation of microparticle in a cylindrical tube for 3D printing

2019 ◽  
Vol 25 (5) ◽  
pp. 925-938 ◽  
Author(s):  
Yannapol Sriphutkiat ◽  
Yufeng Zhou
Keyword(s):  
3D Printing ◽  
Sodium Alginate ◽  
Cylindrical Tube ◽  
Glass Tube ◽  
Acoustic Excitation ◽  
Piezoceramic Plate ◽  
Accumulation Time ◽  
Content Type ◽  
Pc 12 Cells ◽  
Cylindrical Glass

Purpose The capability of microparticle/objects patterning in the three-dimensional (3D) printing structure could improve its performance and functionalities. This paper aims to propose and evaluate a novel acoustic manipulation approach. Design/methodology/approach A novel method to accumulate the microparticles in the cylindrical tube during the 3D printing process is proposed by acoustically exciting the structural vibration of the cylindrical tube at a specific frequency, and subsequently, focusing the 50-μm polystyrene microparticles at the produced pressure node toward the center of the tube by the acoustic radiation force. To realize this solution, a piezoceramic plate was glued to the outside wall of a cylindrical glass tube with a tapered nozzle. The accumulation of microparticles in the tube and printing structure was monitored microscopically and the accumulation time and width were quantitatively evaluated. Furthermore, the application of such technology was also evaluated in the L929 and PC-12 cells suspended in the sodium alginate and gelatin methacryloyl. Findings The measured location of pressure and the excitation frequency of the cylindrical glass tube (172 kHz) agreed quite well with our numerical simulation (168 kHz). Acoustic excitation could effectively and consistently accumulate the microparticles. It is found that the accumulation time and width of microparticles in the tube increase with the concentration of sodium alginate and microparticles in the ink. As a result, the microparticles are concentrated mostly in the central part of the printing structure. In comparison to the conventional printing strategy, acoustic excitation could significantly reduce the width of accumulated microparticles in the printing structure (p < 0.05). In addition, the possibility of high harmonics (385 and 657 kHz) was also explored. L929 and PC-12 cells suspended in the hydrogel can also be accumulated successfully. Originality/value This paper proves that the proposed acoustic approach is able to increase the accuracy of printing capability at a low cost, easy configuration and low power output.

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