نتایج جستجو برای: measurement noise

تعداد نتایج: 620940  

Journal: :Physical review letters 2009
B L Higgins B M Booth A C Doherty S D Bartlett H M Wiseman G J Pryde

We present theory and experiment for the task of discriminating two nonorthogonal states, given multiple copies. We implement several local measurement schemes, on both pure states and states mixed by depolarizing noise. We find that schemes which are optimal (or have optimal scaling) without noise perform worse with noise than simply repeating the optimal single-copy measurement. Applying opti...

بهزادی, محمد حسن , مصطفایی , مریم , نصیری, پروین ,

Introduction: According to previous researches, working at the airport is one of the most vociferous jobs in the world. Airport workers are at risk of noise induced hearing loss. The present study was done to evaluate the Sound Pressure Level (SPL) in the closest aprons to Ground Safety department at Mehrabad airport and to investigate the effect of airport noise on the employees of this depart...

2015
Martin Kendra Tomas Skrucany Jaroslav Masek

The noise is one of the negative elements which affects the human health. This article presents the measurement of emitted noise by road vehicle and its parts during the operation. Measurement was done in the interior of common passenger cars with a digital sound meter. The results compare the noise value in different cars with different body shape, which influences the driver’s health. Transpo...

Journal: :The Review of scientific instruments 2007
Carmine Ciofi Graziella Scandurra Rosario Merlino Gianluca Cannatà Gino Giusi

The properties of a differential transconductance amplifier coupled with a four channel measurement system are exploited in order to reach a very high sensitivity in current noise measurements. In particular, it is demonstrated that, in proper conditions, the noise contributions coming from the active and passive devices that make up the transresistance amplifier can be virtually eliminated. Mo...

2007
Shalabh Goyal

The presence of digital drivers in a mixed-signal circuit such as an A/D converter causes simultaneous switching noise or ground bounce noise on the load board. Coupling of this noise to the sensitive analog lines causes inaccuracy in the measurement of A/D converter linearity specifications. Unlike, the other sources of noise, the ground bounce noise is not a Gaussian distributed random noise....

1997
Christophe Couvreur

Introduction Noise pollution has become an important problem in our society. Noise assessment regulations require the measurement and evaluation of noise. The basic equipment for this measurement is the noise monitoring systems (or NMS). The current generation of NMS consists of "dumb" systems that record noise level and, possibly, noise spectra, over programmed periods of time. The interpretat...

Journal: :iranian journal of public health 0
d. parwizpour h. malek-afzali

to study the relation between hypertension and noise exposure, after the noise monitoring is weaving and spinning workshops, a especially designed questionnaire was completed and measurement were made of blood pressure, height and weight of 1801 male and female workers employed in these workshops. the results indicated that the systolic and diastolic pressure had a direct relation with age and ...

Journal: :The Journal of the Acoustical Society of America 1957

Journal: :Journal of the Optical Society of America A 2007

Journal: :Japanese journal of extra-corporeal technology 1998

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