The simulations allow for a detailed study of the evolution of vortex rings as they move through space, and the shape changes that the rings undergo see image.
For example, the computer model can determine the aspect ratio for which a vortex ring breaks into sub rings, and show how, after encountering a flow of mass against it, the ring is deformed and tilts as it moves further downstream.
Effects like this are often the cause of aerodynamic turbulence affecting vehicles and airplanes. These applications can include biomedical devices to improve blood flow in the heart.
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You can be assured our editors closely monitor every feedback sent and will take appropriate actions. Your opinions are important to us. We do not guarantee individual replies due to extremely high volume of correspondence. E-mail the story Computer simulations can now show how elliptical vortex rings form Your friend's email Your email I would like to subscribe to Science X Newsletter. The proposed framework based on the theory of Activ e Contour Models and Dif-. Moreover, to ev alua te the perfor-.
Because of the disadvantages of the classical active contour model discussed. Since the methodology of the proposed framework allows directly apply the. In Fig ure 1 the. The proposed framework consists on three steps.
Firstly , the construction of. This alignment process consist s in the estimation of the paramet ers. The product of. Process of the proposed image segmentation metho d. I represents the transformed image. Secondly , a preprocessing stage is pe rformed. Then, the Canny edge detector is. Subsequently , the Euclidean distance map EDM  is computed as poten-. The ED M assigns high potential.
On the resulting EDM,. The n ini-. The number o f scaled a ctive contours has to be con-. These sca led. T o perform the optimization process, the control points are assigned as in-. Each population is composed of control. The numerical optimizati on is performed on the Eu-. P i separately in order to minimize the nearest edge sectional solution. If the. The proposed image segmentation framew ork can be implemented by using.
Initialize parameter n of scaled active contours and parameter m of control. Generate m populations assigning the control points as individuals. F or each population P i :. T o assess the performance of the prop osed framework on medical images, Jac-. In our tests, A represents the regions. In these indexes, if the regions A and B are completely sup erimposed the.
In Section 4, the segmentation results obtained from the proposed framework. In this section, the proposed image segmentation framew ork is applied for seg-. The comput a-. In Figure 2 a a CT imag e of the human chest is illustrated, in order to have. Figure 2 b shows the resulting. Euclidean distance map of the test image, in which the optimization process. In Figures 2 c and d the human heart outlined by expert 1 and. In Figure 3 the human heart segmentat ion results on a subset of Computed.
T omography images are introduced. The whole dataset i s composed of CT. In Figure 3 a the man-. The ACM par ameters were set according to  as. Marcus Wharton. Nonlinear Dynamics at the Bedside. A Clinical Perspective on Theory of Heart. About this book Introduction In recent years there has been a growth in interest in studying the heart from the perspective of the physical sciences: mechanics, fluid flow, electromechanics.
This volume is the result of a workshop held in July at the Institute for Nonlinear Sciences at the University of California at San Diego that brought together scientists and clinicians with graduate students and postdoctoral fellows who shared an interest in the heart. A later innovation is the parallel circulation to the lungs, followed by the appearance of septa and the four-chambered heart in reptiles, birds, and mammals.
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There is a reason why the eyes are so powerful in attraction. Men are drawn in because of three aspects about your peepers: their brightness, their size, and the size of your pupils. Your eyes produce a natural lubricant that makes them glow and shine, as you age your eyes produce less and they start to look dull-similarly to your hair.
There is also evidence that larger eyes in proportion to the face are also considered more attractive on a woman. So those doe-eyed beauties catch a man's eye for a good reason! Another interesting fact about your eyes is that eyes and your pupil size can also signal to a man that you are feeling attracted to him. They are subconsciously looking at the health of our teeth, their alignment, their color, and how often we smile.
When humans are deficient in vitamin D or calcium, our teeth can look just plain nasty! If the deficiency is bad enough, you can even lose teeth.
Humans instinctively look at the mouth when we are talking with other people for non-verbal cues. We show our feelings and emotions in the mouth. Smiling is also a sign of friendlessness, warmth, and sociability. We are not suggesting you grin like an idiot when out on a date with a guy; because let's be real, a fake smile ca be seen from a mile away, but being conscious of smiling more can help influence someone's perception that you have a wonderful, amiable personality that will make you easy to get a long with in the long run.
Smell has a huge impact on attraction in humans. Our natural scent puts out a lot of information about our genetic makeup and health to potential mates. Humans and animals, without being aware of it, seem to smell DNA. It is a low-key way to know the genetic overlap we have with another human being and it's also a subtle way to check their health status, too. There have been numerous studies where men and women have been asked to take a whiff of stranger's shirt after being worn for the day and rate the perceived attractiveness of the smell and the person it belonged to.
The results? When meeting in person, there was a high correlation between the rankings of the smell of the shirts and the person's visual rating of attractiveness.
Your skin is one of the first things anyone notices about you.Sep 09, · Understanding how smoke rings form and dissipate could lead to technology allowing airplanes to soar more efficiently and blood to flow more freely through the human heart.
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