КОСВЕННЫЕ МЕТОДЫ ОПРЕДЕЛЕНИЯ РАСХОДА И НАПОРА РОТОРНЫХ НАСОСОВ ДЛЯ КРОВИ

The article describes complex software to calculate the main parameters of the axial pump (pressure drop and flow rate) on the basis of an analysis of its technical characteristics (current consumption and pump speed). It is shown that the calculated value of pressure drop and flow rate throughout the range of operating loads and pump speeds is different from the measured one by no more than 10%. It is shown that this software package may be included in the control system of axial pump. В статье приводится описание методов, средств и результатов расчета основных параметров осевого насоса (перепада давления и расхода) на основе анализа его технических характеристик (потребляемого тока и скорости вращения ротора). Показано, что расчетное значение перепада давления и расхода во всем диапазоне рабочих нагрузок и скоростей вращения ротора насоса отличается от измеренного не более чем на 10%. Демонстрируется возможность включения созданных средств в систему управления осевым насосом крови для протезирования функций левого желудочка сердца.

ДИСТАНЦИОННЫЙ МОНИТОРИНГ ПАЦИЕНТОВ С СИСТЕМОЙ ДЛИТЕЛЬНОЙ МЕХАНОТРОННОЙ ПОДДЕРЖКИ КРОВООБРАЩЕНИЯ

The article describes the technology of remote patient monitoring and the parameters of circulatory assist device AVK-N as well as the advantages of said technology to improve the efficiency of personalized medicine in diagnosis and treatment of patients with AVK-N in the postoperative period. Authors show the capabilities of remote monitoring technology to determine the location of the patient by satellite navigation in the case of emergency call for medical and technical services, and present the structure and modes of the displayed information for mobile devices and Web-server. Doctor-patient interaction based on remote monitoring technology via mobile/ satellite/wired Internet is also shown. Рассматриваются вопросы технологии дистанционного on-line мониторинга состояния пациентов и параметров отечественного аппарата вспомогательного кровообращения АВК-Н. Показаны преимущества рассматриваемой технологии для повышения эффективности принципов персонифицированной медицины в диагностике и лечении пациентов с АВК-Н в послеоперационном периоде. Продемонстрированы возможности технологии для автоматического определения местоположения пациента по данным спутниковой навигации в задаче экстренного вызова медицинских и технических служб. Представлена структура отображаемой информации и режимы ее визуализации на устройствах мобильной связи и Web-сервере. Показана организация взаимодействия лечащего врача с пациентом на базе технологии дистанционного мониторинга по каналам мобильного/спутникового/проводного Internet

ИССЛЕДОВАНИЕ ВЗАИМОДЕЙСТВИЯ ИМПЛАНТИРУЕМОГО РОТОРНОГО НАСОСА И ЛЕВОГО ЖЕЛУДОЧКА СЕРДЦА НА ИМИТАТОРЕ СИСТЕМЫ КРОВООБРАЩЕНИЯ

We analyzed the dynamics of the interaction of rotary pump, connected to the scheme «the left ventricle – aor- ta», and left ventricle in norms and heart failure, using data obtained on the mock circulatory system. Adverse pumping states such as suction and regurgitation can be detected. These limits depend on the degree of cardiac failure, which confirms the need to control the speed of rotation of the impeller in the range of the cardiac failure from pathology to normal. It has been shown that the pulsating pressure at the inlet of the pump modulates the flow of the pump, making it a pulsating, what positively affects on the dynamics of cardiac output. В работе был проведен анализ динамики взаимодействия роторного насоса, подключенного по схеме «левый желудочек – аорта», и левого желудочка сердца в условиях нормы и сердечной недостаточности с использованием данных, полученных на имитаторе системы кровообращения. Определены границы допустимых режимов работы роторного насоса, исключающие обратный сброс через насос из аорты в левый желудочек и развитие отрицательного давления на входе насоса. Причем данные границы зависят от степени сердечной недостаточности, что подтверждает необходимость контроля скорости вращения импеллера в диапазоне изменения сократимости миокарда от патологии к норме. Показано, что пульси- рующее давление на входе насоса модулирует поток насоса, делая его пульсирующим, что положительно влияет на динамику сердечного выброса.

Ocean Seismic Network Pilot Experiment

Author Posting. © American Geophysical Union, 2003. It is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 4 (2003): 1092, doi:10.1029/2002GC000485.The primary goal of the Ocean Seismic Network Pilot Experiment (OSNPE) was to learn how to make high quality broadband seismic measurements on the ocean bottom in preparation for a permanent ocean seismic network. The experiment also had implications for the development of a capability for temporary (e.g., 1 year duration) seismic experiments on the ocean floor. Equipment for installing, operating and monitoring borehole observatories in the deep sea was also tested including a lead-in package, a logging probe, a wire line packer and a control vehicle. The control vehicle was used in three modes during the experiment: for observation of seafloor features and equipment, for equipment launch and recovery, and for power supply and telemetry between ocean bottom units and the ship. The OSNPE which was completed in June 1998 acquired almost four months of continuous data and it demonstrated clearly that a combination of shallow buried and borehole broadband sensors could provide comparable quality data to broadband seismic installations on islands and continents. Burial in soft mud appears to be adequate at frequencies below the microseism peak. Although the borehole sensor was subject to installation noise at low frequencies (0.6 to 50 mHz), analysis of the OSNPE data provides new insights into our understanding of ocean bottom ambient noise. The OSNPE results clearly demonstrate the importance of sediment borne shear modes in ocean bottom ambient noise behavior. Ambient noise drops significantly at high frequencies for a sensor placed just at the sediment basalt interface. At frequencies above the microseism peak, there are two reasons that ocean bottom stations have been generally regarded as noisier than island or land stations: ocean bottom stations are closer to the noise source (the surface gravity waves) and most ocean bottom stations to date have been installed on low rigidity sediments where they are subject to the effects of shear wave resonances. When sensors are placed in boreholes in basement the performance of ocean bottom seismic stations approaches that of continental and island stations. A broadband borehole seismic station should be included in any real-time ocean bottom observatory.This work was sponsored by the National Science Foundation (NSF Grant Numbers: OCE-9522114, OCE-9523541 and OCE-9819439) with additional support from Incorporated Research Institutions for Seismology (IRIS), Joint Oceanographic Institutions, Inc. (JOI Contract No: 12-94), Scripps Institution of Oceanography, a Mellon Grant from Woods Hole Oceanographic Institution, and the Earthquake Research Institute at the University of Tokyo (Visiting Professorship for RAS)

Sources of Fresh Water in the Southern Regions of the Chelyabinsk Region

Abstract The article presents spectrophotometric study of the content of biogenic and abiogenic chemical elements in surface and underground natural waters of the South Ural and other regions. The concentrations of the most important biogenic and abiogenic elements in these waters were determined. The excess concentrations of antimony and manganese in the samples were found. The problem of creation of regional selective filters for drinking water removing xenobiotics from it with a significant excess of MPC is formulated.</jats:p