Jet noise is a common problem in minimum quantity lubrication (MQL) technology. This should be given great attention because of its serious impacts on the physical and mental health operators. In this study, micro-grooved nozzle proposed based reduction concept biological micro-grooves. The flow field acoustic characteristics an original were investigated numerically to help better understand m...

PURPOSE Acoustic and perceptual studies show a number of differences between the voices of radio performers and controls. Despite this, the vocal fold kinematics underlying these differences are largely unknown. Using high-speed videoendoscopy, this study sought to determine whether the vocal vibration features of radio performers differed from those of non-performing controls. METHOD Using h...

the aim of the present study was to examine the rate of noise induced hearing loss in a group of punching and cutting section and other occupational groups workers and its relation with sound pressure levels, age and work history. this descriptive, cross-sectional study included 245 workers of the punching and cutting section and other occupational groups of an iranian axial parts factory in 20...

One problem with speech recognition is a low performance in noisy environments because it is easily influenced by aerial in air. Although the sound quality of body-conducted speech (BCS) and regular speech are different, with BCS recognition, it is possible to recognize an utterance in noisy environments with a rating of 98 dB sound pressure level (SPL) in our previous study. In this study, we ...

CONCLUSIONS This article shows that the inferior colliculus plays a key role in unilateral subjective tinnitus. OBJECTIVES The major aim of this study was to determine tinnitus-related neural activity in the central auditory system of unilateral tinnitus subjects and compare this to control subjects without tinnitus. SUBJECTS AND METHODS Functional MRI (fMRI) was performed in 10 patients (5...

Heart failure (HF) is one of the most life-threatening diseases globally. HF an under-diagnosed condition, and more screening tools are needed to detect it. A few recent studies have suggested that also affects functioning speech production mechanism by causing generation edema in vocal folds impairing lung function. It has not yet been studied whether these possible effects on large enough cau...

In active sensing, animals make motor adjustments to match sensory inputs to specialized neural circuitry. Here, we describe an active sensing system for sound level processing. The pallid bat uses downward frequency-modulated (FM) sweeps as echolocation calls for general orientation and obstacle avoidance. The bat's auditory cortex contains a region selective for these FM sweeps (FM sweep-sele...

Acoustic feedback is a common phenomenon that occurs during hearing aid use, limiting the maximum gain can provide. Effective cancellation of acoustic an essential feature aids. However, due to complex environments in which aids are used and frequently changing path, it difficult for existing adaptive filter-based algorithms balance both convergence speed steady-state error. For this reason, ba...

Long-term exposure to high levels of vibration and noise can have detrimental effects on the health tractor drivers. This study aimed evaluate subjective comfort experienced by drivers operating large-horsepower tractors. A total 10 tractors sourced from 5 different manufacturers were subjected testing. The assessment encompassed three operational conditions, namely, idle, maximum torque, rated...