scholarly journals Analysis of Thermo-electric Field in Steel Strip with Multiple Cracks

2015 ◽  
Author(s):  
Thomas Jin-Chee Liu ◽  
Ji-Fu Tseng ◽  
Po-Heng Chen
Keyword(s):  
Electric Field ◽  
Steel Strip ◽  
Multiple Cracks ◽  
Thermo Electric

scholarly journals Effect of high-frequency electric field on the tissue sticking of minimally invasive electrosurgical devices

2018 ◽  
Vol 5 (7) ◽  
pp. 180125 ◽  
Author(s):  
Liang Zheng ◽  
Jianfei Wan ◽  
Yunjiang Long ◽  
Helin Fu ◽  
Jing Zheng ◽  
...  
Keyword(s):  
Minimally Invasive ◽  
Electric Field ◽  
High Frequency ◽  
Control Group ◽  
Porcine Liver ◽  
Thermo Electric ◽  
Electric Coupling ◽  
Cutting Test ◽  
High Frequency Electric Field ◽  
Frequency Electric Field

Generally minimally invasive surgery is performed using an endoscope and other instruments including electrosurgical units (ESUs), and the adhesion of tissue to electrodes is a major concern. The mechanism governing this tissue sticking, especially the influence of high-frequency electric field, is still unclear. In this study, the effect of high-frequency electric field on the tissue sticking upon electrodes was investigated. The electrosurgical cutting test was performed on ex vivo fresh porcine liver under blend mode using a monopolar ESU. A heat-adherence test without electric field was used as a control. For the control group, the electrode was heated and maintained at a certain temperature and directly in contact with porcine liver. Both sticking tissues obtained from these two tests are partially carbonized porcine liver tissue, but their microstructure and bonding with electrode are obviously different. The sticking tissue formed just under heat is composed of biggish nanoparticles of different sizes which are loosely aggregated and has a weak bonding with the electrode, while the sticking tissue from the electrosurgical cutting test consists of tightly packed fine nanoparticles of equable size as a result of thermo-electric coupling and has a strong bonding with the electrode. Obviously, high-frequency electric field plays an extremely important role in the formation of the sticking tissue. It is the thermo-electric coupling that underlies the function of minimally invasive electrosurgical devices, and the effect of high-frequency electric field cannot be ignored in the tissue sticking study and anti-sticking strategies.

Free Vibration of Functionally Graded Material Beams in a Uniform Electric Field

2012 ◽  
Vol 157-158 ◽  
pp. 3-6 ◽  
Author(s):  
Shu Rong Yu ◽  
Su Hou De ◽  
Jian Ling Fan
Keyword(s):  
Free Vibration ◽  
Electric Field ◽  
Functionally Graded Material ◽  
Temperature Rise ◽  
Great Influence ◽  
Functionally Graded ◽  
Uniform Electric Field ◽  
Thermo Electric ◽  
Buckled Beam ◽  
Graded Material

Free vibration of thermal post-buckled functionally graded material (FGM) beams in a uniform electric field subjected to both temperature rise and voltage is studied. Voltage has a great influence on the deformation of the beam, and Thermo-electric post-buckling equilibrium paths and characteristic curves of the first three natural frequencies versus the temperature, the electricity and the material gradient parameters are plotted. It is found that the three lowest frequencies of the pre-buckled beam decrease with an increase in the temperature, but those of a buckled beam increase monotonically with the temperature rise. The results also show that the tensional force produced in the piezoelectric layers by the voltage can efficiently increase the critical buckling temperature and the natural frequency.

Investigating Secondary Equilibration in Thermoplastic Ionomers Under a Thermo-Electric Field

2016 ◽  
Author(s):  
Prasant Vijayaraghavan ◽  
Vishnu-Baba Sundaresan
Keyword(s):  
Electric Field ◽  
External Electric Field ◽  
Scanning Calorimetry ◽  
Thermo Electric ◽  
Polymer Backbone ◽  
Ionic Dissociation ◽  
Vis Spectroscopy ◽  
Dissociation Temperature ◽  
Reflectance Analysis ◽  
Cross Links

Ionomers are polymers containing a small fraction of charged groups in their polymer backbone. These ionic groups link together to form ionic aggregates which act as temporary cross-links. On heating over the ionic dissociation temperature, these ionic aggregates become mobile in the melt and reaggregate upon cooling. The structure and dynamic behavior of these ionic aggregates gives rise to interesting mechanical and functional properties of the ionomers. Thermal processing of ionomers leads to secondary equilibration of these ionic aggregates. We study this phenomenon of secondary equilibration on application of a thermo-electric field where an electrostatic field is maintained over the ionomer melt. The end goal is to achieve control over the size and distribution of the ionic aggregates by means of an external electric field. The characterization techniques utilized to study the onset of secondary equilibration are UV-Vis Spectroscopy, Differential Scanning Calorimetry, Fourier Transfer Infrared Spectroscopy and Attenuated Total Reflectance analysis. The results indicate that the phenomenon of secondary equilibration is present under the application of a thermoelectric field as indicated by change in spectral and thermal data. A fundamental understanding of the secondary equilibration phenomenon and eventual prevention of the onset of secondary equilibration will lead to long term control of the ionic aggregates by means of an external electric field which will improve the function and utility of these ionomeric materials.

Mass transfer in thermo-electric-field modification of glass-metal nanocomposites

2010 ◽  
Vol 55 (11) ◽  
pp. 1600-1608 ◽  
Author(s):  
V. V. Afrosimov ◽  
B. Ya. Ber ◽  
V. V. Zhurikhina ◽  
M. V. Zamoryanskaya ◽  
D. Yu. Kazantsev ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Electric Field ◽  
Thermo Electric ◽  
Metal Nanocomposites ◽  
Glass Metal
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