background: noise is one of the most important harmful agents in work environment. noise pollution in oil refinery industries is related to workers' health. this study aimed to determine the overall noise pollution of an oil refinery operation and its frequency analysis to determine the control plan for a vent noise in these industries. methods: this experimental study performed in control unit...

In this paper, a double balanced radio frequency multiplier is presented which is customized for transmitted reference ultra wideband (UWB) receivers. The multiplier uses 90nm model parameters and exploits compensating transistors to provide controllable gain for a Gilbert core. After performing periodic and quasiperiodic non linear analyses the RF mixer (multiplier) achieves a voltage conversi...

Reducing the radiated noise from ships is becoming increasingly important as ship -builders aim to reduce the disturbance to marine life, passengers and crew. A major contributor is on-board machinery which typically radiates noise to the water column from both structure-borne and air-borne transmission paths. Problematic machinery is often decoupled from the hull by supporting it on resilient ...

We present a mechanical rotation sensor consisting of a balance pivoting on a tungsten carbide knife edge. These sensors are important for precision seismic isolation systems, as employed in land-based gravitational wave interferometers and for the new field of rotational seismology. The position sensor used is an air-core linear variable differential transformer with a demonstrated noise floor...

Noise pollution has become one of the most serious problems of our society. Considerable part of unpleasant noise is transmitted into the interior of buildings through large vibrating planar structures windows with poor noise-isolation properties caused by their low flexural rigidity. In this Paper, we demonstrate and analyze a noise shielding using an active acoustic metamaterial (AAMM) with e...

Abstract. We use an analytic approach to study the susceptibility of the P Low Frequency Instrument radiometers to various systematic effects. We examine the effects of fluctuations in amplifier gain, in amplifier noise temperature and in the reference load temperature. We also study the effect of imperfect gain modulation, non-ideal matching of radiometer parameters, imperfect isolation i...

In digital images there are multiple sources of noise. Typically, the noise increases on increasing ths ISO but some noise is still observable at lower ISOs as well, especially in underexposed regions of the image. Also, it is often the case that there are patterns in noise specific to the camera being used. While it’s true that on increasing the ISO, random noise dominates; fixed pattern noise...

This paper presents a ultra wideband low noise amplifier for 6GHz Applications. This proposed LNA is the extension of inductively common source amplifier and in this design we used transistor multifingering techniques in order to reduce noise and improves gain. This LNA is simulated by using UMC .18um CMOS mixed signal/RF process in cadence virtuoso. In this design, used current source biasing,...

In FDD cellular standards, the transmitter’s out of-band noise leaks into the receive band due to the finite duplexer TX to RX isolation. If this noise is not low enough, a SAW filter is needed before the Power Amplifier to preserve the RX sensitivity. Out-of-band noise is also an important concern for coexistence of cellular transmitters with standards like GPS, WLAN and/or WiMAX on the same s...

The advantages of a dielectric loaded double-stacked electromagnetic bandgap structure with a significantly improved noise isolation bandwidth, fabricated on a low-temperature co-fired ceramic multilayer substrate, were experimentally demonstrated in system-inpackage applications. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 942–944, 2008; Published online in Wiley InterScience...