344 research outputs found
ULTRASOUND AND ORGANIC ACIDS INVESTIGATIONS ON MINERALIZED BIOLOGICAL STRUCTURES. FIFTH COMMUNICATION. DEMINERALIZATION OF BIO-STRUCTURES (BONES AND SHELLS) WITH COMPLEXON III SOLUTION IN ULTRASOUND ENVIRONMENT
No abstract
ADSORPTION OF METHYLENE BLUE OVER SOME ACID AND THERMALLY ACTIVIED NATIVE SORBENTS IN ULTRASOUND FIELD
No abstrac
CONCERNING METHYLENE BLUE SORPTION OVER ACID AND THERMALLY ACTIVIED KAOLIN IN ULTRASOUND FIELD
No abstrac
A TWO-DIMENSIONAL MATHEMATICAL MODEL OF THE HUMAN BLOOD GLUCOSE REGULATION MECHANISM
No abstrac
STUDIES ON THE SORPTION PROPERTIES OF NATIVE SORBENTS. First report. Thermal Activation of Native Sorbents from North-Eastern Bulgaria for Rendering Innocuous the Nickel Ions from Industrial Sewage Waters
No abstrac
A software system for pathological voice acoustic analysis
International audienceA software system for pathological voice analysis using only the resources of a personal computer with a sound card is proposed. The system is written on the basis of specific methods and algorithms for pathological voice analysis and allows evaluation of: 1) Pitch period (To); 2) Degree of unvoiceness; 3) Pitch perturbation and amplitude perturbation quotients; 4) Dissimilarity of surfaces of the pitch pulses; 5) Ratio aperiodic/periodic components in cepstra; 6) Ratio {energy in the cepstral pitch pulse}-to-{total cepstral energy}; 7) Harmonics-to-noise ratio; 8) Degree of hoarseness; 9) Ratio low-to-high frequency energies; 10) Glottal Closing Quotient. The voices of 400 persons were analyzed - 100 (50 females/50 males) normal speakers and 300 (100 females/200 males) patients. The statistical analysis shows very significant changes in PPQ, DH, DPP, DUV, APR, HNR and PECM, and significant changes in APQ and CQ
Comment on "First-principles study of the influence of (110)-oriented strain on the ferroelectric properties of rutile TiO2"
In a recent article, Gr\"{u}nebohm et al. [Phys. Rev. B 84 132105 (2011),
arXiv:1106.2820] report that they fail to reproduce the A2u ferroelectric
instability of TiO2 in the rutile structure calculated with density functional
theory within the PBE-GGA approximation by Montanari et al. [Chem. Phys. Lett
364, 528 (2002)]. We demonstrate that this disagreement arises from an
erroneous treatment of Ti 3s and 3p semi-core electrons as core in their
calculations. Fortuitously the effect of the frozen semi-core pseudopotential
cancels the phonon instability of the PBE exchange-correlation, and the
combination yields phonon frequencies similar to the LDA harmonic values.
Gr\"{u}nebohm et al. also attempted and failed to reproduce the soft acoustic
phonon mode instability under (110) strain reported by Mitev et al. [Phys. Rev.
B 81 134303 (2010)]. For this mode the combination of PBE-GGA and frozen
semi-core yields a small imaginary frequency of 9.8i. The failure of
Gr\"{u}nebohm et al. to find this mode probably arose from numerical
limitations of the geometry optimization approach in the presence of a shallow
double well potential; the optimization method is not suitable for locating
such instabilities.Comment: 5 page
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