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Grigory Babenko, Vadim Efimov, Mikhail Kiselev and Maksim Shkurin
Helicopters are widely used for air transportation and aerial work with cargo on external cables, one of the most challenging and dangerous uses. The main reason for the flight complication is the change in the controllability characteristics of the heli...
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Vladimir G. Povarov, Ignaty Efimov, Ksenia I. Smyshlyaeva and Viacheslav A. Rudko
Since 2020, 0.5% limits on the sulfur content of marine fuels have been in effect worldwide. One way to achieve this value is to mix the residual sulfur and distillate low sulfur components. The main problem with this method is the possibility of sedimen...
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Ksenia I. Smyshlyaeva, Viacheslav A. Rudko, Vladimir G. Povarov, Alina A. Shaidulina, Ignaty Efimov, Renat R. Gabdulkhakov, Igor N. Pyagay and James G. Speight
The effects of asphaltenes from two heavy oil residues on the sedimentation stability of residual marine fuels were assessed and compared. As base components of residual marine fuels, the vacuum residue (VacRes) and visbreaking residue (VisRes) were take...
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Petr G. Efimov
A new approach to reveal the dynamics of taxa on incompletely investigated territories was developed. The decline/expansion rate of orchids in the North Western part of European Russia (Leningrad, Novgorod and Pskov Regions, an area approx. 195 000 km2.)...
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Petr G. Efimov
The morphology of 38 species of the genus Platanthera s.l. was investigated by means of light and electron microscopy. Particular attention was paid to the structure of gynostemium and pollinaria. The species investigated represent 10 major lineages of t...
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Grinenko, A. Gurovich, V. T. Krasik, Y. E. Sayapin, A. Efimov, S. Felsteiner, J.
Pág. 240 - 244
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