Evaluation of Temperature Distribution During Hyperthermic Treatment in Biliary Tumors: A Computational Approach

1999 ◽  
Vol 121 (2) ◽  
pp. 141-147 ◽  
Author(s):  
B. Rivolta ◽  
F. Inzoli ◽  
S. Mantero ◽  
A. Severini
Keyword(s):  
Temperature Distribution ◽  
Three Dimensional ◽  
Blood Perfusion ◽  
Computational Approach ◽  
Bioheat Transfer ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Capillary Perfusion ◽  
Worst Case ◽  
Hepatic Vessels

A computational approach is adopted to predict the temperature distribution in the biliary tissue during hyperthermic treatments in biliary tumors. Two different models are developed: an axisymmetric model and a three-dimensional model. In the first model the Pennes bioheat transfer equation is applied. It is aimed at simulating the thermoregulatory effect of the capillary bed and it can also give a pressure criterion to determine whether the blood perfusion term should be included in the mathematical model. The second model is aimed at simulating the convective effect of the large hepatic vessels: A constant Nusselt number is assumed on the sides of the vessels. The simulations of the three-dimensional model have been carried out with and without capillary perfusion in the tissue, i.e., respectively in the worst case and in the best case that may occur during heating. The results show that it is possible to obtain therapeutic temperature values in the tissue for time intervals considered acceptable by physicians. Moreover, the model is able to give more precise information about the volumes of tumoral tissue heated above therapeutic temperatures with the hyperthermic technique considered.

A Computational Approach to Visual Recognition of Arm Movements

1985 ◽  
Vol 60 (1) ◽  
pp. 203-228 ◽  
Author(s):  
Lucia Vaina ◽  
Youcef Bennour
Keyword(s):  
Large Class ◽  
Visual Recognition ◽  
Three Dimensional ◽  
Arm Movements ◽  
Computational Approach ◽  
The Body ◽  
Dimensional Model ◽  
Joint Angles ◽  
Three Dimensional Model ◽  
Hand Shape

A representation for the visual recognition of skilled arm movements is proposed that lies within Mart and Vaina's (1982) three-dimensional model representation for shape movements. Algorithms for segmenting arm movements into pieces are proposed. It is suggested that for a large class of arm movements recognition could be reliably achieved based only on the description of the hand shape and path in the body coordinates, without needing the detailed description of the variation of all the joint angles of the arm.

scholarly journals Integration of Optical and Thermal Models for Organic Light-Emitting Diodes

Electronics ◽  
2018 ◽  
Vol 8 (1) ◽  
pp. 17 ◽  
Author(s):  
An-Chi Wei ◽  
Yih-Jong Huang ◽  
Bo-Lin Huang ◽  
Jyh-Rou Sze
Keyword(s):  
Temperature Distribution ◽  
Light Emitting Diodes ◽  
Three Dimensional ◽  
Organic Light Emitting Diodes ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Single Model ◽  
Light Emitting ◽  
Organic Light ◽  
Proposed Model

This paper proposes a three-dimensional model for combinative analysis of the illuminative and thermal properties of organic light-emitting diodes (OLED). By means of the energy conversion ratio and energy conservation theory, two individual optical and thermal sub-models are integrated to form a single model constructed in a multi-physics platform. According to the measured luminous performance and temperature distribution of the fabricated OLED samples, the proposed model demonstrates sufficient accuracy. Moreover, the temperature distribution on the cross-section of the OLED can be derived from the proposed model and used as a valuable reference for manufacturers to select appropriate organic materials.

Temperature Distribution of a Wave Journal Bearing: Comparison With Test Data

2007 ◽  
Author(s):  
Nicoleta M. Ene ◽  
Florin Dimofte ◽  
Theo G. Keith ◽  
Robert F. Handschuh
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Temperature Distribution ◽  
Test Data ◽  
Journal Bearing ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Theoretical Results ◽  
Comparison With Experimental Data

An advanced three-dimensional model is developed to compute the temperature distribution in a wave journal bearing. The analysis takes into account the heat transfer between the film and both the shaft and the bush. The theoretical results are validated by comparison with experimental data.

Three-Dimensional Model for Virtual Surgical Simulation, during Complex Skull Base Surgery and Aneurysm Surgery

Skull Base ◽  
2008 ◽  
Vol 18 (S 01) ◽  
Author(s):  
Akio Morita ◽  
Toshikazu Kimura ◽  
Shigeo Sora ◽  
Kengo Nishimura ◽  
Hisayuki Sugiyama ◽  
...  
Keyword(s):  
Skull Base ◽  
Surgical Simulation ◽  
Skull Base Surgery ◽  
Three Dimensional ◽  
Aneurysm Surgery ◽  
Dimensional Model ◽  
Three Dimensional Model
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