We study parametric resonance of interacting waves having the same wave vector and frequency. In addition to the well-known period-doubling instability we show that under certain conditions the instability is caused by a Hopf bifurcation leading to quasiperiodic traveling waves. It occurs, for example, if the group velocities of both waves have different signs and the damping is weak. The dynam...

RESUMO Este trabalho apresenta informações de documentos inéditos 1840, com as descrições da fabricação três canhões, um fato técnico a ser rememorado, pelo ineditismo, pelos desafios técnicos que superou e registros descritivos na Fábrica Ferro Ipanema, realizados major João Bloem, o então diretor, das agruras resultantes Revolta Liberal. Nesse momento, expansão indústria paulista do açúcar co...

La función de los títulos créditos en inicios del cine, es variada, debido a que poseen una finalidad informativa. El objetivo estudio analizar la evolución el través selección y comparación trabajo PABLO FERRO. investigación tiene un enfoque cualitativo paradigma interpretativo con método hermenéutico validación crítico, permita descomponer, describir, valorar las técnicas utilizadas resultado...

Iron is a very important element to form hemoglobin (Hb). Blood supplement tablets which are often consumed in the process of adding iron ferro fumarate, so this study aims determine levels (Fe) contained blood drugs (ferro fumarate). This type research was laboratory experiment using complexometric method and complex forming substance, namely disodium ethylene diamine tetra acetate (Na2EDTA). ...

the synthesis of nano- structured cobalt through a controlled chemical process followed by heat treating at various temperatures is studied. the product is characterized by icp, xrd, fesem , and tem, indicating that the as- synthesized particles have an amorphous structure with 1.76 for co/b ratio, an average size of 50 nm. the transformation of intermediate phases into single phase nano- cryst...

Despite their inherent non-equilibrium nature1, living systems can self-organize in highly ordered collective states2,3 that share striking similarities with the thermodynamic equilibrium phases4,5 of conventional condensed matter and fluid systems. Examples range from the liquid-crystal-like arrangements of bacterial colonies6,7, microbial suspensions8,9 and tissues10 to the coherent macro-sca...

Micron size Fe3O4 powders were chemically prepared and processed by radio frequency (13.56 MHz) oxygen plasma irradiation technique at different elevated temperatures using low radio frequency (RF) power level. Low magnetic field RF superconducting quantum interference device (SQUID) magnetization studies were performed up to a maximum magnetic field of 100 Oe, which was well below the magnetic...

Although the therapeutic use of pulsed magnetic fields has long been in existence, understanding of its mode of action has been poorly understood. As early as 1940, Nagelshmidt proposed that its action was at the cellular level and this has now been supported by research. It has been shown that damaged cells have a reduced negative charge, with subsequent effect on the flow of ions. This causes...

Conventional von-Neumann computing models have achieved remarkable feats for the past few decades. However, they fail to deliver the required efficiency for certain basic tasks like image and speech recognition when compared to biological systems. As such, taking cues from biological systems, novel computing paradigms are being explored for efficient hardware implementations of recognition/clas...