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Characterization and Rheological Properties of Ultra-High Molecular Weight Polyethylenes.
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A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 29, Leninskiy Prospect, 119991 Moscow, Russia.
The molecular characteristics and rheological properties of three UHMWPE samples were investigated. The high-temperature GPC method was used for characterizing UHMWPE samples used. The interpretation of the measurement results was based on calibration using the PS standard and the approximation of the PS data by linear and cubic polynomials, as well as on the data for linear PE.
View Article and Find Full Text PDFSensitivity of Acoustic Voice Quality Measures in Simulated Reverberation Conditions.
Bioengineering (Basel)
December 2024
Department of Communication Sciences and Disorders, University of Iowa, Iowa City, IA 52242, USA.
Room reverberation can affect oral/aural communication and is especially critical in computer analysis of voice. High levels of reverberation can distort voice recordings, impacting the accuracy of quantifying voice production quality and vocal health evaluations. This study quantifies the impact of additive simulated reverberation on otherwise clean voice recordings as reflected in voice metrics commonly used for voice quality evaluation.
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Dipartimento di Scienze Matematiche, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy.
We study two harmonic oscillators with high quality factors, driven by equilibrium and off equilibrium thermal noise, the latter mimicked by establishing a temperature gradient. The two oscillators are coupled via a third reciprocal harmonic interaction. We deepen the case of a weak coupling between the two oscillators, and show the emergence of a "spike" in the displacement variance of the colder oscillator, when the respective elastic constants approach each other.
View Article and Find Full Text PDFOrbital and suborbital temperature variability in the central Mediterranean across the Pliocene/Pleistocene transition.
PLoS One
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Dipartimento di Geoscienze, Università degli Studi di Padova, Padova, Italy.
A high-resolution record of central Mediterranean Sea Surface Temperatures (SSTs) based on the alkenone UK'37 index and planktic δ18O values for the surface-dweller G. ruber has been reconstructed across the Pliocene/Pleistocene transition at Monte San Nicola (Sicily), reference area for the GSSP (Global Boundary Stratotype Section and Point) of the Gelasian Stage. Spectral analyses indicate that the SST record is predominantly paced by a cyclicity in the ~47 kyr time domain, consistent with the obliquity driven glacial-interglacial variability that is expected to dominate in the interval of relevance.
View Article and Find Full Text PDFCorrelation Analysis Between Cortical Structural Features and Acoustic Features in Patients With Parkinson's Disease.
J Voice
December 2024
Neurology Department II, Fuyang People's Hospital, Fuyang, China. Electronic address:
Purpose: Parkinson disease (PD) is a progressive neurodegenerative disease. The aim of this study is to investigate the association between acoustic and cortical brain features in Parkinson's disease patients.
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