نتایج جستجو برای: spiral

تعداد نتایج: 32206  

Journal: :Monthly Notices of the Royal Astronomical Society 1967

Journal: :Computers & Mathematics with Applications 1989

2005
Sanjay Pande

Technological breakthroughs in the 1990s have given rise to an exciting advance in medical imaging: spiral computed tomography (CT) remarkable speed and volumetric data acquisition set spiral CT apart from conventional CT. These advantages have improved the detection rates for laryngeal, thoracic, hepatic, pancreatic, and renal disease. Moreover, spiral CT technology has spawned a new vascular ...

Journal: :Nano letters 2010
Jed I Ziegler Richard F Haglund

The Archimedean spiral geometry presents a platform for exploration of complex plasmonic mechanisms and applications. Here we show both through simulations and experiment that more complex plasmonic modes with unique near-field structure and larger mode volumes can be realized within a single, topologically robust structure. In the spiral, complex polarization response, resonant interactions an...

Journal: :Physical review letters 2012
Christian W Zemlin Arkady M Pertsov

Anchoring of spiral and scroll waves in excitable media has attracted considerable interest in the context of cardiac arrhythmias. Here, by bombarding inclusions with drifting spiral and scroll waves, we explore the forces exerted by inclusions onto an approaching spiral and derive the equations of motion governing spiral dynamics in the vicinity of inclusion. We demonstrate that these forces n...

Journal: :Missouri Journal of Mathematical Sciences 2010

Journal: :Journal of Physical Oceanography 2002

Journal: :Academic Medicine 1972

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2008
Igal Berenstein Alberto P Muñuzuri Lingfa Yang Milos Dolnik Anatol M Zhabotinsky Irving R Epstein

Breathing spiral waves are observed in the oscillatory chlorine dioxide-iodine-malonic acid reaction-diffusion system. The breathing develops within established patterns of multiple spiral waves after the concentration of polyvinyl alcohol in the feeding chamber of a continuously fed, unstirred reactor is increased. The breathing period is determined by the period of bulk oscillations in the fe...

Journal: :International journal of occupational safety and ergonomics : JOSE 2007
Wojciech Lapka Czesław Cempel

The paper presents noise reduction (NR) of spiral ducts as a result of computational modeling of acoustic wave propagation. Three-dimensional models were created with the finite element method in COMSOL Multiphysics version 3.3. Nine models of spiral ducts with 1-9 spiral leads were considered. Time-harmonic analysis was used to predict NR, which was shown in spectral and interval frequency ban...

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