Evaluation of integral exposure energy load on aural analyzer of miners

The individual exposure integral noise load on workers before the beginning of hearing impairment was determined for a group of 20 male miners who had worked with drilling equipment and harvesters for 8 to 20 years before the onset of the disability. Results show that the total exposure energy load of about 4 kw x h sq m, obtained by miners in the examined group, resulted in occupational injury to the auditory organ (cochlear neuritis) in 75% of the cases. The equivalent energy level of noise computed according to the date of total energy load is roughly 99 db A, which significantly exceeds the permissible amount of 85 db A. There is a correlation (r = 0.77) between the integral exposure energy noise on the aural analyzer in the degree of increase in the total threshold for the mean speech range

The statistics of the photometric accuracy based on MASS data and the evaluation of high-altitude wind

The effect of stellar scintillation on the accuracy of photometric measurements is analyzed. We obtain a convenient form of estimaton of this effect in the long exposure regime, when the turbulence shift produced by the wind is much larger than the aperture of the telescope. A simple method is proposed to determine index $S_3$ introduced by perture of the Kenyon et al. (2006), directly from the measurements with the Multi Aperture Scintillation Sensor (MASS) without information on vertical profile of the wind. The statistics $S_3$ resulting from our campaign of 2005 -- 2007 at Maidanak observatory is presented. It is shown that these data can be used to estimate high-altitude winds at pressure level 70 -- 100 mbar. Comparison with the wind speed retrieved from the NCEP/NCAR global models shows a good agreement. Some prospects for retrieval of the wind speed profile from the MASS measurements are outlined.Comment: 11 pages, 9 figures, accepted for publication in Astronomy Letter

The new method of hidden signals transmission

In this paper, we propose a new method of using frequency bands employed for secure communication signals. The possibility of using this method in the sound band of analog TV.В данной работе предлагается новый метод использования занятых частотных полос для скрытой передачи сигналов. Показана возможность применения данного метода в полосе частот звукового сопровождения аналогового ТВ

Weight functions of light shield and the signal at the input of optical sensor at the intersection of the bullets of light shield

In this article, the definition of weight functions of a light shield at the intersection of the bullet in different field areas of shield registration is considered. The signal definition at the input of an optical sensor at the intersection of the bullet of a light shield is viewed. The research results can be used in considering the facts that can influence on the error estimation of the coordinate determination when a bullet hits the target

Creation of a local differential subsystem based on a cellular network

В данной работе рассматриваются вопросы создания локальной дифференциальной системы (ЛДС) глобальных навигационных спутниковых систем (ГНСС). В качестве канала передачи корректирующей информации используется сотовая сеть GSM. ЛДС строится на основе геодезической контрольно-корректирующей станции (ГККС) и спутниковой двухчастотной навигационной аппаратуры «ИЗЫСКАНИЕ». Такая система позволит путем дополнения аппаратуры потребителя ГНСС специализированным модемом повысить точность определения местоположения до дециметровых величин. Преимуществом ЛДС является доступность для массового использования населением города Екатеринбурга. Вторым преимуществом является то, что система создается полностью на основе российского оборудования. Помимо этого, в статье решаются задачи точной координатной привязки фазового центра антенны ГККС и создания навигационной аппаратуры потребителя ЛДС.This paper is devoted to the problems of creation of local differential system (LDS) of GNSS. Mobile network GSM is used as a transmission channel of correcting information. LDS is based on geodesic control correcting station (GCCS) and satellite double frequency navigation equipment ―INVESTIGATION‖. Such system will help to increase accuracy of position determination to decimeters values by special modem adding to user equipment GNSS. Access for mass using by Yekaterinburg citizens is one of LDS advantages. Another LDS advantage is entire creation on the base of Russian equipment. Besides, this article solves the problems of precise coordinate connection of antenna GCCS phase centre and creation of navigation equipment LDS user