Infrared laser photo-acoustic spectroscopy provides very high sensitivity of a gas sample analysis when high-power tunable radiation sources and resonant detectors (PADs) are used. In the PAD, acoustic signal generated by absorbed in measurement chamber is amplified proportionally to Q-factor resonator. But, compact lasers (with power above 100 mW) still not widely spread terahertz spectral ran...

The image quality and resolution of the Atomic Force Microscope (AFM) operating in tapping mode is dependent on the quality (Q) factor of the sensing micro-cantilever. Increasing the cantilever Q factor improves image resolution and reduces the risk of sample and cantilever damage. Active piezoelectric shunt control is introduced in this work as a new technique for modifying the Q factor of a p...

In this paper, a high-Q resonator is presented and its structure is in the shape of spiral, hence Complementary Spiral Resonator. The measurement of the complementary spiral resonator itself shows that a higher loaded quality factor is provided as compared to the Double H-Shaped Resonator. The resonator was designed to operate at a frequency of 10 GHz and the phase noise performance of the syst...

We recently reported the analysis of the frequency noise in the frequency modulation atomic force microscopy (FM-AFM) both in high-Q and low-Q environments [Rev. Sci. Instrum. 80, 043708 (2009)]. We showed in the paper that the oscillator noise, the frequency fluctuation of the oscillator, becomes prominent in the modulation frequency lower than f(0)∕2Q, where f(0) and Q are the resonance frequ...

ion of spherically symmetric hydration shells that rigidly follow a moving charge, these results indicate that chargemovement stronglymodifies the hydration structure, which evolves from a closed spherical shell to a cylindrical hydration “sleeve” with cylindrical symmetry. Finally, we discuss the strengths and weaknesses of GFID in the context of this “proof of concept” example. A. Dynamical R...

A photonic ATM switch based on wavelengthdivision multiplexing will include several lossy passive devices, erbium-doped fiber amplifiers, and semiconductor optical amplifiers (SOAs) in a cascade configuration for fast switching of ns order. Its level diagram, which is very different from those of optical transmission links, has not been adequately studied. This paper investigates the concept of...

the main objective of this research was to evaluate reliability and validity of recovery stress questionnaire for athlestes (rest q-sport). professional and semi-professional athletes of handball and basketball constitute statistical population of current work. some 510 athletes were chosen in random as statistical samples. measurement tool used was a rest q-sport comprised of 76 questions with...

Future generations of gravitational wave interferometers are likely to be operated at cryogenic temperatures because one of the sensitivity limiting factors of the present generation is the thermal noise of end mirrors and beam splitters that occurs in the optical substrates as well as in the dielectric coatings. A possible method for minimizing thermal noise is cooling to cryogenic temperature...