Oscillations

This report investigates resonance phenomena of driven damped simple harmonic oscillations by measuring accelerations and frequencies of an oscillator. Since it turned out that oscillations with low damping have smaller errors than those with high damping, small damping cases are employed to examine the resonance phenomena. Based on the Newton's 2nd Law \cite{book}, the motion of oscillations can be modeled by the following differential equation and its solution. \begin{equation} \label{eq1} \ddot

3. Results The investigated minerals show Raman bands between 375 and 50 cm-1 (Figs. 1-4, Table 1), where the cut-off value of the employed Raman notch and edge filters determine the low-energy limit. The Raman bands in the boulangerite spectra occur in the vibrational region between 375 and 50 cm–1 (Fig. 1, Table 1), with no additional bands in higher or lower wavenumber regions. Boulangerite spectra are characterized by a very strong band at 335 cm–1 and reveal thirteen strong, medium, weak to

Abstract The El-Niño Southern Oscillation is a complex sequence of natural climate variations that take place in the tropics of the Pacific Ocean, yet affect the climate of the entire globe. The climate phenomenon, known as ENSO, has three main phases that each differ markedly in their atmospheric and oceanic conditions. El Niño, also known as “the warm phase”, is the first cycle that begins when warm water in the eastern Pacific Ocean shifts to the west toward South America. During El Niño, the

In the last twenty years Nanoscience and Nanotechnologies have become more significant and have found a lot of applications in many aspects; the synthesis making nanostructured materials with helpful and tunable properties is central to the evolution of nanoscale science and technology. Nanometre scale metal particles exhibit optical, electronic, magnetic and chemical properties which have wonderful technological and scholar value. Among them silver, copper, and gold nanoparticles (NP) offer powerful

 An Analytical Expression for Electromechanical Oscillation Frequency Yongli Zhu, Student Member, IEEE, Kai Sun, Senior Member, IEEE Abstract—In this letter, a mathematic proof and improvement of a classic result for multi-machine systems modal analysis is given considering non-uniform damping and line resistance. An analytical formula is derived for the estimation of electromechanical oscillation frequency. Matrix theory based proof is conducted via determinant simplification and matrix triangularization

1. Introduction The complex and interesting optical properties can be shown clearly on Nanostructured metals the collective oscillations of the conduction electrons termed plasmons lead to most striking phenomenon encountered in these structures are resonances . Plasmon modes exist in a number of geometries and in various metals — most importantly in noble metals such as gold, copper and silver. Under certain circumstances plasmons are excited by light, which leads to strong light scattering and

IntroductionThe complex and interesting optical properties can be shown clearly on Nanostructured metals the collective oscillations of the conduction electrons termed plasmons lead to most striking phenomenon encountered in these structures are resonances . Plasmon modes number of geometries and in various metals ? most importantly in noble metals such as gold, copper and silver. Under certain circumstances are excited by light, which leads to strong light scattering and absorption and an enhancement

The complex and interesting optical properties can be shown clearly on Nanostructured metals the collective oscillations of the conduction electrons termed plasmons lead to most striking phenomenon encountered in these structures are resonances . Plasmon modes exist in a number of geometries and in various metals — most importantly in noble metals such as gold, copper and silver. Under certain circumstances plasmons are excited by light, which leads to strong light scattering and absorption and

growing number of research has looked at the effects of stimulating brain oscillations on memory performance. Brain oscillations are fluctuations in local field potentials, caused by the input of neurons in to a specific cell assembly (Hanslmayr, Staudigl, & Fellner, 2012). In response to a stimulus, alpha (~10 Hz) and beta (~15-30 Hz) oscillation power decrease in activity, while theta (~4-7 Hz) and gamma (~40-100 Hz) oscillations increase (Hanslmayr & Staudigl, 2014). The changes in oscillatory power

temporal variation in respiratory system impedance (Zrs) and phase. Hypothesis: The newly developed portable Forced Oscillation Technique (FOT) measures the respiratory impedance as accurately as existing market devices. This aim is designed to validate the lab developed devices. Rationale: Current methods to evaluate the respiratory system are limited to Spirometry and Forced Oscillation Technique. Spirometry is the gold standard test to evaluate the respiratory system[1]. Although it has been used