Результаты поиска

Vibrational spectra and ab initio analysis of tert-butyl, trimethylsilyl, and trimethylgermyl derivatives of 3,3-dimethylcyclopropene. VI: Application of observed trends to stannyl derivatives.

The effects of substitution of X = C by Si or Ge in X(CH(3))(3) moieties attached to the formal double bond of 3,3-dimethylcyclopropene are examined. Regularities in observed trends of vibrational frequencies implicating the moieties containing the X atom, as the X atomic mass is increased, are extrapolated to X = Sn. The results of this extrapolation made it possible to assign the known experimental vibrational frequencies of 3,3-dimethyl-1-(trimethylstannyl)cyclopropene and 3,3-dimethyl-1,2-bis(trimethylstannyl)cyclopropene.

Ventricular fold vibration in voice production: a high-speed imaging study with kymographic, acoustic and perceptual analyses of a voice patient and a vocally healthy subject.

Co-vibrations of the ventricular folds are a common finding in the clinical setting. It is not always obvious how much of the perceived voice change can be attributed to the presence of such vibrations. The aim of the present study was to describe laryngeal vibrations as observed by high-speed imaging in cases where ventricular fold vibrations had been observed. The findings at kymographic display of the recordings were correlated to perceptual measures and spectrographic observations. Two subjects, a 65-year-old man with chronic laryngitis and one vocally healthy man, were examined during pre…

Theoretical study of the electrostatic and steric effects on the spectroscopic characteristics of the metal-ligand unit of heme proteins. 3. Vibrational properties of Fe(III)CN-.

The vibronic theory of chemical activation and quantum chemical calculations are applied to calculate the stretching vibrational frequency of cyanide, coordinated by the complex of ferric porphyrin with imidazole. The results show that the frequency of the stretching vibration of the cyanide strongly depends on its coordination geometry and is hardly affected by the electrostatic perturbations of reasonable magnitude. The comparison of these results with the experimental data on the cyanide complexes of different heme proteins and their models allows to elucidate the cyanide coordination geome…

Cardiovascular changes and hearing threshold shifts in men under complex exposures to noise, whole body vibrations, temperatures and competition-type psychic load.

This study deals with changes in the temporary hearing threshold (TTS2), heart rate (HR), R-wave amplitude (RWA), diastolic blood pressure (DBP), systolic blood pressure (SBP), pulse pressure (PP) and reaction time (RT) in subjects (n = 108) who, while working on a choice reaction apparatus, were exposed in an exposure chamber to combinations of noise and vibration at dry bulb temperatures of 20 degrees and 30 degrees C. The study was carried out as a type 2-3-3 factorial experiment, the number of the exposure combinations thus being 18. To find out the effects of competition-type psychic stre…

Acute effect of whole-body vibration on hand grip strength, muscular activity, and upper limb function in young females with smartphone addiction: a randomized controlled trial.

OBJECTIVE: To assess the efficacy of whole-body vibration (WBV) on hand grip strength, muscular activity, and upper limb function in young females with smartphone addiction. MATERIALS AND METHODS: This is a single-blinded randomized controlled trial. 66 females aged 18-25 years with smartphone addiction were randomly distributed into two equal groups; WBV group: It received WBV with strengthening exercises, and Sham WBV group: that received Sham WBV plus strengthening exercises. All participants received two sessions per week for four consecutive weeks. The primary outcome was hand grip stren…

IIoT-Based Remote Monitoring System for Temperature, Current, and Vibration Using PLC and Node-RED in a Data Center Cooling Compressor: A Condition-Based Maintenance Framework.

Climate control systems are critical to ensuring the continuous operation of data centers, as they maintain the environmental conditions req … he proposed architecture integrates industrial-grade sensors for temperature, electric current, and vibration, a Siemens LOGO! programmable logic controller (PLC) for signal acquisition and scaling, a Node-RED middleware layer for data flow management, and the ThingSpeak cloud platform for remote storage and analysis. The novel contributions of this work ar …

Skull Vibration-Induced Nystagmus Reveals Hidden Vestibular Asymmetry Dissociated from vHIT, VEMPs and Velocity-Storage-Related Responses: A Clinical-Physiological Case Series and Temporal-Domain Hypothesis.

BACKGROUND/OBJECTIVES: Skull vibration-induced nystagmus (SVIN) is a robust sign of vestibular asymmetry, yet its relationship with tests of impulsive canal function, short-latency otolithic reflexes, and sustained visuo-vestibular processing remains incompletely defined. To describe four clinical-physiological cases in which SVIN was dominant or disproportionate relative to the canal, otolithic-reflex, and sustained-domain profiles, and to propose a temporal-domain interpretation of this physiological non-congruence. METHODS: Four patients with persistent disequilibrium, episodic vertigo, or…

Whole-body vibration administered during a 3-week in-hospital multidisciplinary body weight reduction program increases resting energy expenditure in obese adolescents, a randomized clinical trial.

BACKGROUND: Pediatric obesity is a growing global health concern, and interventions aimed at increasing resting energy expenditure (REE) have gained attention as complementary strategies to dietary restriction. Whole-body vibration (WBV), an innovative exercise mimetic, may offer metabolic and functional benefits, particularly in populations with limited exercise tolerance. This study was a randomized clinical trial aimed to evaluate the effects of incorporating WBV into a 3-week in-hospital multidisciplinary body weight reduction program (BWRP) in male adolescents with obesity. METHODS: Twen…

Randomized clinical trial to evaluate the effectiveness of different thicknesses of stabilization splints in treating temporomandibular disorder using joint vibration analysis as a novel diagnostic tool.

AIM: The purpose of the study was to comparatively evaluate temporomandibular joint function and treatment response using joint vibration analysis (JVA) in patients exhibiting disc displacement with reduction (DDR), treated with three variable thickness of stabilization splints. JVA analyzed these vibrations to detect internal joint abnormalities, and their patterns were further categorized using the Piper classification was highly accurate and hence used over magnetic resonance imaging. SETTINGS AND DESIGN: Randomized clinical trial. MATERIALS AND METHODS: The splint of different thicknesse…

Performance of spleen stiffness measurement by 100-Hz vibration-controlled transient elastography, liver stiffness, APRI score and their combination for predicting oesophageal varices in liver cirrhosis.

BACKGROUND: Oesophageal varices (EV) rupture remains one of the most severe complications of cirrhosis. As the gold standard to predict this accident, esophagogastroduodenoscopy (EGD) itself also has a weakness. Not all patients are convenient with this modality in clinical practice apart from the risk and cost burden. Hence, the search for other non-invasive modalities with high accuracy is still noteworthy. Among them, spleen stiffness measurement (SSM) with 100 Hz probe, liver stiffness measurement (LSM), and the aspartate amino transferase to platelet ratio index (APRI) score became popula

Effects of Vibration Therapy on Muscle Strength, Shoulder Range of Motion, and Muscle Biomechanical Properties in Patients With Breast Cancer Undergoing Radiotherapy: A Randomized Controlled Trial.

OBJECTIVE: The aim of the study was to investigate the effects of vibration therapy to home-based exercises on shoulder muscle strength, range of motion, pain-related disability, and muscles viscoelastic properties of shoulder and neck in patients with breast cancer undergoing radiotherapy. DESIGN: This randomized controlled superiority trial was conducted with 38 participants who underwent breast cancer surgery. All patients were randomized into two groups: control group and vibration group. Both groups performed home-based exercises for 5 days a week for 6 wks. Vibration group received addi…

Comparison of 2 Multimodal Interventions With and Without Whole Body Vibration Therapy Plus Traction on Pain and Disability in Patients With Nonspecific Chronic Low Back Pain.

OBJECTIVE: The purpose of this secondary data analysis was to compare the effect of 2 multimodal exercise-based physical therapy interventions (one with and one without whole-body vibration [WBV] therapy plus traction) on pain and disability in patients with nonspecific chronic low back pain (NSCLBP). METHODS: We conducted a secondary analysis of data from 2 distinct samples. One sample was from the Focus on Therapeutic Outcomes Inc. (FOTO) group (n = 55, age 55.1 ± 19.0 years), and the other was the Illinois Back Institute (IBI) (n = 70, age 47.5 ± 13.4 years). Both groups of patients had NS…

Combined whole body vibration and balance training using Vibrosphere®: improvement of trunk stability, muscle tone, and postural control in stroke patients during early geriatric rehabilitation.

Strokes are a leading cause of disability, immobility, and reduced ability to perform activities of daily living (ADLs) among the elderly. Balance and postural control are often affected in stroke patients. Physical therapy for the lower back to improve posture, mobility, and ADLs can be very time consuming. In this randomized, controlled study of 66 geriatric patients (mean age 74.5 years) with stroke-related paresis or hemiplegia, it was demonstrated that stroke patients may benefit more from 3 additional weeks of combined whole body vibration and balance training than from a comprehensive i…

Charge Migration in Cations: Structures, Energies, and Vibrational Frequencies of Ground and Excited States of HCCX+, CH3X+, Vinyl Bromide Cation and Propiolic Acid Cations.

Coherent superposition of ground and excited states of cations can produce ultrafast charge migration that can be monitored by attosecond transient absorption, attosecond pump-IR probe, high harmonic spectroscopy, attosecond streaking, and strong field ionization. Vibrational motion on the ground and excited states of the cations leads to decoherence and decay of charge migration. Computational modeling of charge migration requires suitable methods for calculating energy differences between the electronic states of the cations and potential energy surfaces for the ground and excited states of …

Time-resolved ultrabroadband far-to-mid-infrared spectroscopy directly reveals doorway-mediated vibrational energy flow in an energetic crystal (β-HMX).

Understanding how vibrational energy flows from molecular vibrations to lattice phonons is critical for controlling the sensitivity of energetic molecular crystals. The intervening low-frequency doorway modes play a key role in this process, yet their ultrafast dynamics remain largely unexplored due to the lack of experimental access. Here, we overcome this limitation using time-resolved ultrabroadband far-to-mid-infrared spectroscopy, which allows us to directly monitor vibrational energy transfer (VET) involving doorway and lattice modes across the full 100-1700 cm-1 range in crystalline β-H…

Integrated structural, vibrational, thermal, and optical characterization of a zinc-based organic-inorganic hybrid with DFT and molecular docking insights into its biological properties.

A novel zero-dimensional organic-inorganic hybrid material, (C9H8N)2[ZnCl4]·2H2O, was synthesized and investigated using structural, spectroscopic, thermal, optical, and biological approaches. Single-crystal X-ray diffraction reveals a monoclinic structure (C2/c) composed of isolated [ZnCl4]2- tetrahedra stabilized by quinolinium cations and lattice water molecules through hydrogen bonding and π-π interactions. Vibrational analyses (FTIR and Raman) confirm the structural features and indicate slight distortions of the ZnCl4 2- units. Thermal studies show a multistep decomposition involving deh…

Quantifying the Dynamics That Link Leg Tendon Vibration to Induced Periodic Postural Oscillations in Young Subjects: Differential Effects of Light Touch on the the Induced Sway.

Periodic sensory and mechanical perturbations applied to standing humans have provided key insights into postural control in health and disease. However, the contribution of sinusoidal proprioceptive drive and its interaction with haptic cues has not yet been systematically explored. Here, a bilateral Achilles tendon-vibration paradigm using a 100 Hz sinusoidal carrier, which was amplitude-modulated (AM) by 0.1-0.5 Hz sinusoids, was applied to 16 healthy young adults, and anteroposterior center-of-mass (COM) displacement was analyzed. The vibration protocol resulted in entrainment between the …

Воздействие подготовки пилатесов в сочетании с вибрацией всего тела на балансе и мобильностью у людей с множественным склерозом: однослепые случайные клинические испытания.

ЦЕЛИ: Данное исследование направлено на изучение воздействия подготовки пилатесов в сочетании с вибрацией всего тела (WBV) на баланс, функциональную мобильность, стойкость и мощность основных мышц, прочность нижней конечности, эффективность верхней конечности и усталость у людей с множественным склерозом. ПАТИЕНТЫ И МЕТОДЫ: Это произвольное контролируемое испытание было проведено в период с декабря 2023 и сентябрь 2024. Thirty-four Участники9 мужского пола; 25 женщины; средний возраст: 36.7±12.2 годы; диапазон, 20 в адрес 65 в год) были включены в исследование и в произвольном порядке two груп

Совпадение в аннотации оригинала
OBJECTIVES: This study aims to investigate the effects of Pilates training combined with whole-body vibration (WBV) on balance, functional mobility, core muscle endurance and power, lower extremity strength, upper extremity performance, and fatigue in people with multiple sclerosis. PATIENTS AND METHODS: This randomized controlled trial was conducted betwee…

Intermittent vibrational stimulation can affect the lower limb kinematics three months after anterior cruciate ligament reconstruction: a randomised controlled trial.

Anterior cruciate ligament (ACL) injuries often lead to significant gait alterations, with traditional rehabilitation sometimes failing to address these issues. Intermittent vibration stimulation (IVS) can enhance muscle function and reduce pain in knee pathologies. This randomized controlled trial investigated whether IVS affects lower limb kinematics during gait and stair ambulation in individuals three months post-ACL-reconstruction (ACLR). Twenty-seven participants, aged 18-45, were randomly assigned to receive IVS or a sham device. Additionally, 24 healthy participants were recruited to p…