نتایج جستجو برای: frequency percentage
تعداد نتایج: 608915 فیلتر نتایج به سال:
Introduction: The aim of the present study was preparing polymeric materials and nanocomposites based on nanoparticles of zinc oxide in normal cases the coated with gelatin and comparing them in terms of sound transmission loss in different frequencies. Method: This study was an experimental one. The materials used in the current study were included zinc oxide nanoparticles, polymer po...
Introduction: In the most industrial environment, workers are exposed to noise everyday. Exposure to this physical hazardous agent can cause immediate as well as delayed adverse effects. Cognitive performance decrement is one of the adverse effects of noise exposure which its main consequences is occupational accidents. This study attempted examine the effect of exposure to different levels of ...
OBJECTIVES/HYPOTHESIS To evaluate the safety and efficacy of acoustic and electric sound processing for individuals with significant residual low-frequency hearing and severe-to-profound high-frequency sensorineural hearing loss. STUDY DESIGN Prospective, single-arm repeated measures, single-subject design. METHODS Fifty individuals, ≥ 18 years old, with low-frequency hearing and severe hig...
Research in the last several years has indicated that fire size and frequency are on the rise in western U.S. forests. Although fire size and frequency are important, they do not necessarily scale with ecosystem effects of fire, as different ecosystems have different ecological and evolutionary relationships with fire. Our study assessed trends and patterns in fire size and frequency from 1910 ...
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