Phase transformations of InSb~211! induced by 130-fs laser pulses at 800 nm have been time resolved in a wide range of laser fluences. The pump-probe technique has been used, where both optical reflectivity and reflected second-harmonic generation ~SHG! from the probe pulses are monitored as functions of probe versus pump pulse delay. The results are indicative of InSb undergoing a phase transi...

In this paper the vibration behaviors of a structure equipped with a tuned liquid column damper (TLCD) under a harmonic type of earthquake loading are studied. However, due to inherent nonlinear liquid damping, it is no doubt that a great deal of computational effort is required to search the optimum parameters of the TLCD, numerically. Therefore by linearization the equation of motion of the s...

Sounds created by a periodic process have a Fourier representation with harmonic structure – i.e., components at multiples of a fundamental frequency. Harmonic frequency relations are a prominent feature of speech and many other natural sounds. Harmonicity is closely related to the perception of pitch and is believed to provide an important acoustic grouping cue underlying sound segregation. He...

Activity in research relating to the compression of digital speech signals has increased markedly in recent years due in part to rising consumer demand for products such as digital cellular telephones, personal communications systems, and multimedia systems. The dominant structure for speech codecs at rates above 4 kb/s is Code Excited Linear Prediction (CELP) in which the speech waveform is re...

Femtosecond time-resolved spectroscopy in polyatomic systems investigated by velocity-map imaging and high-order harmonic generation presented by David STÄDTER Revealing the underlying ultrafast dynamics in molecular reaction spectroscopy demands state-of-the-art imaging techniques to follow a molecular process step by step. Femtosecond time-resolved velocity-map imaging is used to study the ph...

A force m onitoring system consisting of stress-sensitive magnetoelastic strips forremotely measuring the force profile across a hard surface is described. Under the excitation of amagnetic AC field, the m agnetoelastic strips generated higher-order harmonic fields (magneticAC fields at multiple frequencies of the excitation field), allowing remote measurement of theirresponses ...

We study the nonlinear optical properties of lithium niobate (LiNbO(3)) nanowires (NWs) fabricated by a top-down ion beam enhanced etching method. First, we demonstrate generation and propagation of the second-harmonic (SH) light in LiNbO(3) NWs of typical rectangular cross-sections of 400 x 600 nm(2) and length from 10 to 50 μm. Then, we show local fluorescent excitation of 4',6-diamidino-2-ph...

In this paper the vibration behaviors of a structure equipped with a tuned liquid column damper (TLCD) under a harmonic type of earthquake loading are studied. However, due to inherent nonlinear liquid damping, it is no doubt that a great deal of computational effort is required to search the optimum parameters of the TLCD, numerically. Therefore by linearization the equation of motion of the s...

Intrinsic Localized Modes (ILMs) or Discrete Breathers (DBs) are produced through a non-linear vibration localization phenomenon. While Anderson localization is due to lattice defects, the nonlinearity of lattices provides the basis for ILM excitation. Over the past two decades, these ILMs have been realized in a wide range of physical systems including photonic crystals, nonlinear atomic latti...