IMPROVEMENT OF THE MAIN UNITS OF A GAS-TURBINE INSTALLATION USING METHODS OF COMPUTATIONAL GAS DYNAMICS

Рассмотрены вопросы применения инструментов численного моделирования для совершенствования основных узлов газотурбинных установок. В работе описан пример доводки конструкции осевого компрессора, решения вопроса надежности камеры сгорания и анализа путей повышения эффективности системы охлаждения лопаточного аппарата газовой турбины.This paper discusses the use of numerical modeling tools to improve the main components of gas turbine plants. The paper describes an example of fine-tuning the design of an axial compressor, solving the reliability of the combustion chamber and analyzing ways to improve the efficiency of the cooling system of a gas turbine blade apparatus

PPR proteins - orchestrators of organelle RNA metabolism.

Pentatricopeptide repeat (PPR) proteins are important RNA regulators in chloroplasts and mitochondria, aiding in RNA editing, maturation, stabilisation or intron splicing, and in transcription and translation of organellar genes. In this review, we summarise all PPR proteins documented so far in plants and the green alga Chlamydomonas. By further analysis of the known target RNAs from Arabidopsis thaliana PPR proteins, we find that all organellar-encoded complexes are regulated by these proteins, although to differing extents. In particular, the orthologous complexes of NADH dehydrogenase (Complex I) in the mitochondria and NADH dehydrogenase-like (NDH) complex in the chloroplast were the most regulated, with respectively 60 and 28% of all characterised A. thaliana PPR proteins targeting their genes

Triggering in trigatron spark gaps: A fundamental study

The trigatron has been in widespread use as a demand-triggered, high-voltage switch for more than 40 years. In spite of the popularity and maturity of the technology, there persists an uncertainty over the basic physical mechanism(s) responsible for triggering breakdown in the devices. We present the results of an empirical study of trigatrons that demonstrates that breakdown is initiated by a streamer launched from the trigger pin, independent of the trigger spark. We compare our results with those of previous workers, and discuss the generality of our conclusions

VEGA Balloon System and Instrumentation

International audienceThe VEGA Venus balloon radio transmissions received on Earth were used to measure the motion of the balloons and to obtain the data recorded by onboard sensors measuring atmospheric characteristics. Thus the balloons themselves, the gondolas, the onboard sensors, and the radio transmission system were all components of the experiment. A description of these elements is given, and a few details of data sampling and formatting are discussed