the paper is based on a study conducted in three different industries on 84.4 on their employees to determine the effect of over all noise intensity, length of employment and rest periods among them. it was found that the mentioned factors have direct effect on the induced hearing loss among the exposed workers. high noise level and long period of employment adversely affect the hearing ability...

This report maps the organization of the primary auditory cortex of the pallid bat in terms of frequency tuning, selectivity for behaviorally relevant sounds, and interaural intensity difference (IID) sensitivity. The pallid bat is unusual in that it localizes terrestrial prey by passively listening to prey-generated noise transients (1-20 kHz), while reserving high-frequency (<30 kHz) echoloca...

We investigate the second spectrum of charge carrier density fluctuations in graphene within McWorther model, where noise is induced by electron traps substrate. Within this simple picture, we obtain a closed-form expression including both Gaussian and non-Gaussian fluctuations. show that very extended distribution switching rates substrate leads to power with non-trivial structure on scale mea...

Low frequency 1/f noise is investigated in graphene, encapsulated between the hexagonal boron nitride (hBN) substrate dual gated geometry. The overall magnitude smaller as compared to graphene on Si/SiO2 substrate. amplitude hole doped region independent of carrier density, while electron region, a pronounced peak observed at Fermi energy, EF?90 meV. physical mechanism anomalous attributed impu...

This paper proposes the optimal structure of a Printed Circuit Boardbased micro-PCR chip constructed on a PCB substrate using commercial adhesive tapes and plastic films. The proposed micro-PCR chip was composed of four layers. In a previous experiment, the chip had been made with a green PCB, yielding an unwanted reflection that prevented accurate analysis. In this study, the solder mask of th...

results according to the study results, noise levels in a co2 plant’s house and control room ranged from 88 to 102 db and 79 to 82 db (a), respectively. in order to reduce the amount of emitted noise in the co2 plant house and control room, a noise control plan was implemented in each part of the facility; it was met with effective results. conclusions the findings of this investigation have cl...

We present fully nonlinear time-dependent simulations of the gravity-driven flow of thin wetting liquid films. The computations of the flow on a homogeneous substrate show that the contact line, becomes unstable and develops a finger-like or sawtooth structure [Phys. Rev. Lett. 86, 632 (2001)]. These computations are extended to patterned surfaces, where surface heterogeneities are introduced i...

We discuss the feasibility of a new type of high temperature superconducting bolometer operating in the sub-millimeter region (A > 300pm ) of the spectrum in the temperature range 80K + 100K. We use the sharp resistive transition of BizS~aCaCuzO~+, superconducting single crystals as sensitive thermometer. The sensor is thermally coupled to a thin diamond substrate covered on the back side with ...

We explore the application of the semiconducting phases of YBaCuO thin films as a bolometer for uncooled infrared detection. For this study, four different structures were built with different types of buffer layers: YBaCuO on a Si substrate with and without a MgO buffer layer, and on an oxidized Si substrate with and without a MgO buffer layer. These films were all amorphous without a detectab...

-Low frequency noise in four-terminal JFETs has been measured as a function of substrate (second gate) bias with temperature and drain current as additional variables. Sharp peaks of noise have been observed at some values of gate bias. The mechanism of low frequency noise caused by Schockley-Read-Hall (SRH) centres and the significance of charge capture processes in and near the channel are di...