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Search Results: 1 - 10 of 2651 matches for " Deformation "
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Image Deformation by User-Defined Force Fields  [PDF]
Jian Wu
Journal of Signal and Information Processing (JSIP) , 2016, DOI: 10.4236/jsip.2016.71004
Abstract: We present a new method for image deformation. The warping technique provides smooth distortion with intuitive and easy manipulation. Driven by a restrained force field, the input image is deformed gradually and continuously. The method allows us to customize the force fields and the region of interest manually through some simple steps. Experimental results demonstrate the effectiveness and convenience of the approach.
Flow Rate through a Blood Vessel Deformed Due To a Uniform Pressure  [PDF]
Amy Cypher, J Mohamed B. Elgindi, Hatem Kouriachi, David Peschman, Reba Shotwell
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2011, DOI: 10.4236/jbnb.2011.24046
Abstract: In this paper, we present the mathematical equations that govern the deformation of an imbedded blood vessel under external uniform pressure taking into consideration the nonliner behavior of the soft tissue surrounding the vessel. We present a bifurcation analysis and give explicit formulas for the bifurcation points and the corresponding first order approximations for the\emph{non-trivial} solutions. We then show the results of a MATLAB program that integrates the equilibrium equations and calculates the blood flow rate through a deformed cross section for given values of the elasticity parameters and pressure. Finally, we provide (numerical) verification that the flow rate as a function of the elasticity parameters of the soft tissue surrounding the blood vessel is convex, and therefore validate the invertibility of our model.
Analysis of the Rheological Behavior of Aging Bitumen and Predicting the Risk of Permanent Deformation of Asphalt  [PDF]
Samia Saoula, Khedoudja Soudani, Smail Haddadi, Maria Eugenia Munoz, Antxon Santamaria
Materials Sciences and Applications (MSA) , 2013, DOI: 10.4236/msa.2013.45040
Abstract:

The aging of bitumen has a significant impact on the mechanical behavior of asphalt. This aging is carried out at the mixing operation with the aggregates generally at 163°C in the case of pure mixtures or at temperatures higher than in the case of the modification by polymers or industrial waste. This paper presents experimental results of a study of the rheological behavior of a class of bitumen 40/50 to the artificial aging. Three aging temperatures were selected: 163°C, 173°C and 183°C. From obtained results, a study of the risk of deformation of asphalt is performed, based on the results of correlation between the behavior of the coated and his binder deducted SHRP specifications and technical advice French. These results show that the stiffness of the aged binders increases with aging temperature. Moreover, there is no risk of rutting and fatigue cracking for thermal coated projected.

Multimodality Vessel Modeling Analysis for Cerebral Arteriovenous Malformation  [PDF]
Y. Kiran Kumar, Shashi B. Mehta, Manjunath Ramachandra
Journal of Behavioral and Brain Science (JBBS) , 2014, DOI: 10.4236/jbbs.2014.41003
Abstract:

Cerebral arteriovenous malformations (AVMs) are a type of vascular anomaly consisting of large intertwined vascular growth (Nidus) that is prone to serious hemorrhaging and can result in patient death if left untreated. Intervention through surgical clipping of feeding and draining vessels to the Nidus is a common treatment. However, identification of which vessels to clip is challenging even to experienced surgeons aided by conventional image guidance systems. The lumped modeling for the Cerebral Arteriovenous Malformation (CAVM) hemodynamic analysis is of high importance in clinical world. As part of the treatment planning for CAVM, it is difficult for doctors to assess the NIDUS part, which may get rupture while inserting catheter. In this paper, we have proposed a non-invasive method for assessing the hemodynamic condition of AVM. The measurement of flow and pressure without intervention along the vessel is a big challenge due to occlusion, bending and thinning of the vessel in Arteriovenous Malformation patients. In this paper, we analyzed a lumped model for the vascular malformation using various imaging multi-modalities that help to analyze CAVM Structures.

Bevel Tip Deformation in New and Used Dental Needles  [PDF]
César Gaitán- Fonseca, Denise Romo- Castillo, Bernardino Cerda- Cristerna, David Masuoka, Amaury Pozos- Guillén
Microscopy Research (MR) , 2015, DOI: 10.4236/mr.2015.31001
Abstract:
Objectives: To evaluate quantitatively deformation of the angle of the horizontal plane of the bevel tip in new dental needles and in dental needles used in clinical procedures. Material and Methods: A cross-sectional study was performed with 360 dental needles from four different manufacturers. The needles were divided into four groups (90 per group): Group 1, Monoject\"\"; Group 2, DLP\"\"; Group 3, Badiject, and Group 4, Zeyco. The new and used needles were evaluated by scanning electron microscopy to evaluate quantitatively the deformation on the bevel. Results: All groups showed a significantly statistical difference between new needles and needles used for one or two injections (P < 0.05), except for those of Group 4, which exhibited no statistical difference. Conclusion: All dental needles used demonstrated tip deformation after their use, but in addition, dental needles without clinical use also showed deformation.
Effects of Solution Atoms and Precipitates on Isochronal Annealing Behavior of Cold-Rolled Squeeze-Cast SiCw/Al Composites  [PDF]
Wenglong Zhang, Mingyuan Gu
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.25062
Abstract: SiCw/Al and SiCw/6061Al composites, which contained 15 vol pct of whiskers, were fabricated through a squeeze cast route followed by cold rolling and isochronal annealing. Effects of whicker, solution atoms and precipitates on isochronal annealing behavior of cold rolled composites were investigated by comparing the isochronal annealing behavior between pure Al, SiCw/Al, solution-treated SiCw/6061Al and aged SiCw/6061Al. It was found that the recrystallization of SiCw/Al composite occurs earlier than that of pure Al, indicating SiCw has a role of particle stimulated nucleation. Solution atoms have no significant influence on the isochronal annealing behavior of SiCw/6061Al composite, while precipitates have such a strong retarding effect on the recrystallization of SiCw/6061Al composite that the isochronal annealing curve of aged SiCw/6061 composite loses the definable recrystallization step.
Plastic Flow Macrolocalization: Autowave and Quasi-Particle  [PDF]
Lev B. Zuev, Svetlana A. Barannikova
Journal of Modern Physics (JMP) , 2010, DOI: 10.4236/jmp.2010.11001
Abstract: A new approach is proposed to describe the autowave processes responsible for plastic deformation localiza-tion in metals and alloys. The existence of a quasi-particle, which corresponds to a localized plastic flow autowave, is postulated and its characteristics are determined. The above postulate leads to a number of cor-ollaries and quantitative assessments that are considered herein. The deformation processes occurring on the macro- and micro-scale levels are found to be directly related.
Retractions of One Dimensional Manifold  [PDF]
A. E. El-Ahmady, Nashwa Salem Awyd Al-Hazmi
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.310167
Abstract: Our aim in the present article is to introduce and study types of retraction of one dimensional manifold. New types of geodesics in one dimensional manifold are presented. The deformation retracts of one dimensional manifold into itself and onto geodesics is deduced. Also, the isometric and topological folding in each case and the relation between the deformations retracts after and before folding has been obtained. New types of conditional folding are described.
Severe Plastic Deformation of Steel Induced by Ultrasonic Vibrations  [PDF]
C. Xu,Y. Cui,Q. Han
Open Journal of Metal (OJMetal) , 2013, DOI: 10.4236/ojmetal.2013.31001
Abstract: High-intensity ultrasonic vibration was focused on the tip of conical steel specimens to induce severe plastic deformation at room temperature. We found, for the first time, that grain size smaller than 200 nm was obtained. Furthermore, the sharp tip of the conical specimen became umbrella-shaped or disk-shaped. The tip size changed from 0.5 mm diameter to a disk about 5 mm diameter, representing a large amount of plastic deformation in the metal at the tip of the conical specimen.
Severe Plastic Deformation of Steel Induced by Ultrasonic Vibrations  [PDF]
C. Xu, Y. Cui, Q. Han
Open Journal of Metal (OJMetal) , 2013, DOI: 10.4236/ojmetal.2013.31001
Abstract:  

High-intensity ultrasonic vibration was focused on the tip of conical steel specimens to induce severe plastic deformation at room temperature. We found, for the first time, that grain size smaller than 200 nm was obtained. Furthermore, the sharp tip of the conical specimen became umbrella-shaped or disk-shaped. The tip size changed from 0.5 mm diameter to a disk about 5 mm diameter, representing a large amount of plastic deformation in the metal at the tip of the conical specimen.

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