98%
921
2 minutes
20
The performance of sensing and optical devices is closely linked to the molecular polarizability response, a property significantly influenced by the polarizability tensor's isotropic and anisotropic components. In this study, we investigate the impact of vibrational motion on polarizability. We analyze how intramolecular vibrations affect the polar properties of molecules commonly employed in refrigerants and gas detection technologies. Our computational estimates align well with experimental data. It is revealed that vibrational effects can introduce uncertainties of up to 6% in sensing devices and 50% in optical devices due to nuclear oscillations. Furthermore, normal mode analysis highlights specific vibrational modes that enhance molecular polarizability.
Download full-text PDF |
Source |
---|---|
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11971279 | PMC |
http://dx.doi.org/10.1038/s41598-025-88066-5 | DOI Listing |
Dysphagia
September 2025
Department of Occupational Therapy, CNC Purun Hospital, Cheongju, Chungcheongbuk-do, Republic of Korea.
This study examined the effects of vibratory stimulation on swallowing-related muscle strength in patients with dysphagia due to stroke, using three types of stimulators and a systematic exercise program. This study was conducted in two stages. In Experiment 1, we examined the effects of three types of vibratory stimulation on the pressure of the tongue and lips (N = 23).
View Article and Find Full Text PDFInt Arch Occup Environ Health
September 2025
Department of Mechanical Engineering, Politecnico di Milano, Milan, Italy.
Purpose: To investigate the role of personal risk factors in the occurrence of the vascular, neurological and fibroproliferative disorders of the hand-arm vibration syndrome (HAVS) in workers groups exposed to hand-transmitted vibration (HTV).
Methods: HAVS prevalence and incidence data were pooled across a series of cross-sectional studies (total sample: 1272 HTV workers, 579 controls) and prospective cohort studies (total sample: 377 HTV workers, 138 controls) conducted in Central and North-Eastern Italy. The pooled studies included detailed individual-level information about HTV exposure, personal risk factors, medical comorbidities and HAVS disorders.
J Acoust Soc Am
September 2025
Department of Head and Neck Surgery, University of California, Los Angeles, 31-24 Rehab Center, 1000 Veteran Avenue, Los Angeles, California 90095-1794, USA.
The goal of this study was to understand the interaction between the voice source spectral shape, formant tuning, and fundamental frequency in determining the vocal tract contribution to vocal intensity. Computational voice simulations were performed with parametric variations in both vocal fold and vocal tract configurations. The vocal tract contribution to vocal intensity was quantified as the difference in the A-weighted sound pressure level between the radiated sound pressure and the sound pressure at the glottis.
View Article and Find Full Text PDFIntroduction: Distraction methods such as virtual reality and cold vibration devices (Buzzy) are recommended during vascular access. Few studies focused on distraction during intramuscular injection.
Methods: This study evaluated the effect of distraction methods on procedure-related pain, fear, and anxiety during the intramuscular injection in children aged 5 to 12 years in the pediatric emergency department.
Small Methods
September 2025
Department of Biomedical Engineering, College of Future Technology, Peking University, Beijing, 100871, China.
Understanding the brain's complexity and developing treatments for its disorders necessitates advanced neural technologies. Magnetic fields can deeply penetrate biological tissues-including bone and air-without significant attenuation, offering a compelling approach for wireless, bidirectional neural interfacing. This review explores the rapidly advancing field of magnetic implantable devices and materials designed for modulation and sensing of the brain.
View Article and Find Full Text PDF