Invited lecture at the US - Indo Workshop: Advancing VLF Science Through the Global AWESOME Network, Goa, India, 28.11-1.12. 2011. We have considered disturbances in the D region which occur at night when the ionization levels are substantially lower than at daytime, which is convenient to observe Lightning induced Electron Precipitation (LEP) events in particular. The lightning generated whistler wave interacts with geomagnetically confined electrons and causes the electrons to precipitate from the geomagnetic trap to the lower ionosphere, producing there excess of ionization., which is registered by the VLF signal. The analysis of VLF recorded LEP events over the period 2008-2011 has been performed. The method of varying the values of the Wait's parameters so as to match observed and simulated amplitude and phase perturbations has been used for determining the location and size of the ionospheric disturbance over the transmitter- receiver great circle path . The enhancement of the electron density profile from the regular values has been determined within the altitude range 60-90 km height, and the descend of the night-time reflection height below 87 km has been deduced.
B.04 Guest lecture
COBISS.SI-ID: 2103291Technical problem of the invention is the determination of a pumping speed of vacuum pumps, where a known throughput, in the case of getter pumps disappearing in the getter material, and an equilibrium pressure at the inlet of test pumps are needed. Apparatus for determination of a pumping speed consists of a subassembly for the throughput generation and a test chamber for the measurement of an equilibrium pressure at the inlet of a getter pump. The test chamber with an attached inert vacuum gauge (and the isolated getter pump) can be used as a calibration volume for an in-situ calibration of throughput using the pressure rise method instead of the standard throughput method. The maintenance of a constant throughput in the molecular-flow regime is enabled by the selection of amount and pressure of a test gas and corresponding gas-flow restriction elements, and the use of inert vacuum gauges for the establishment and calibration of a throughput as well as the measurement of an equilibrium pressure. A temporal interruption of the throughput enables the measurement of a residual pressure of inert gases.
F.11 Development of a new service
COBISS.SI-ID: 852906Research and development of integrated surge arresters which contain gas discharge tubes with the aim of higher realibility and miniaturization. In this work we present new results on new types of miniature gas surge arresters to technical audience of SEMTO 2011 meeting.
F.06 Development of a new product
COBISS.SI-ID: 25395239