Generalized mathematical model of a linear single-axis accelerometer as an integral part of the inclinometer

The article deals with the creation of a generalized mathematical model of inclinometer that allows more fully than any known prior mathematical model to study its properties under actual operating conditions. The mathematical model of inclinometer considered non-identical electrical parameters of the primary sensors. Mathematical model of a linear single-axis accelerometer is also built, which is part of the inclinometer

Improving data transfer efficiency in a gas field wireless telemetry system

Effective organisation of communication channels in autonomous information and measurement systems (AIMS) is a burning issue. It is particularly challenging for areas where, for a number of reasons (primarily unprofitability or immaturity of the wired infrastructure), telecommunications can rely only on wireless technologies, i.e., radio channels. Arctic regions of the Russian Federation, where most of Russia’s gas and gas condensate deposits are located, constitute a typical example of such areas. The key challenges during construction of wireless communication channels are associated with the fixed range of frequencies that can be used without a licence. For the purposes of radio traffic, the frequency used by AIMS transmitters and receivers depends on the frequency of the quartz crystal resonators used in such devices. The stability of this frequency determines both the number of radio channels that can be used and the efficiency of data transfer. Key factors affecting the quartz frequency include temperature and “ageing” of quartz crystals. Known methods for increasing the frequency stability generally allow compensation for the temperature drift of the quartz frequency. In addition, such methods are increasingly energy-consuming, which is unacceptable in the Extreme North. This article suggests using GPS receiver data for frequency adjustment. With a minor increase in energy consumption, this technique enables full compensation for quartz crystal resonator frequency drift, no matter what the cause of such drift, eventually allowing operation of more radio channels within the authorised bandwidth with preserved channel separation. In general, it helps increase the efficiency of data transfer in the telemetry systems of gas field operations

Возможности реабилитации после эндопротезирования ахиллова сухожилия

This study reveals the new method - endoprosthetic Achilles tendon. As a result of the study the optimal implant was created, operational surgery of Achilles tendon endoprosthetics was modified and the recover program was formed. Current method allows to avoid immobilization of the operated limb but to carry out early rehabilitation activities and exercises with intent to restore triceps muscular strength. The remote results in 6 month's after Achilles tendon replacement in 34 patients were excellent, in 46 patients were good and in 1 patient were unsatisfactory.В результате проведенной работы создан принципиально новый метод хирургического лечения пациентов с разрывами Ахиллова сухожилия (АС), заключающаяся в его эндопротезировании. Разработана и модифицирована реабилитационная программа. Первичное анатомическое восстановление АС с помощью эндопротеза, в отличии от шва и аутопластики, позволили реализовать и модифицировать активные реабилитационные мероприятия, улучшить результат лечения пациентов. Результаты лечения были оценены по шкале H.Thermann et all. (1992) через 12 недель с момента операции. У 34 больных из группы со свежими разрывами Ахиллова сухожилия средняя оценка составила 94 балла из 100. Результаты лечения оценены как отличные. У 46 пациентов из группы с застарелыми повреждениями средняя оценка составила 88 баллов. Результат лечения данных больных оценен как хороший