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Integrated stratigraphy of the reference sections for the Callovian-Oxfordian boundary in European Russia

Kiselev D., Rogov M., Glinskikh L., Guzhikov A., Pimenov M., Mikhailov A., Dzyuba O., Matveev A., Tesakova E.

Volumina Jurassica

2013

Vol. 11, no. 1

59–-96

The most complete succession of the Callovian-Oxfordian boundary recorded in European Russia is the Dubki section, where the authors have carried out integrated paleontological and magnetostratigraphical studies. A continuous sequence of the West-European biostratigraphic units in the interval from the Lamberti to the Cordatum Zones is present in this section, and 10 ammonite biohorizons have been recognized. Additional data concerning nannofossil assemblages, foraminifers, ostracods, belemnoids and the paleomagnetic polarity for the Dubki section are also presented. The Callovian-Oxfordian boundary, marked by FAD of the genus Cardioceras, is placed at the base of the scarburgense biohorizon. The paleontological richness and continuity of the succession make the Dubki section a possible GSSP candidate for the Callovian/Oxfordian boundary. Correlation of the Dubki ammonite succession with those of the other GSSP candidates, Redcliff Point and Thuoux, is proposed. Other sections studied in Russia have yielded some additional observations on the Callovian-Oxfordian boundary beds. Although in the Dubki section the praemartini biohorizon is not found, its existence is proved, however, in Orenburg region (Khanskaya Gora). In the Datchovskaya section (Northern Caucasus) the paucicostatum biohorizon is characterized by an unusual combination of Subtethyan and Boreal ammonites, including Kosmoceras, which is not typical of the paucicostatum biohorizon outside the Northern Caucasus.

Flight test investigations of aerodynamic features of the manoeuvrable jet trainer YAK/AEM-130

Matveev A., Popovich K.

Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics

2001

nr 12

1-6

To investigate some special aerodynamic features of the new manoeuvrable Jet Trainer Yak/A EM-130 Demonstrator (see Fig. 1) unique flight tests were performed in the years 1999(1) and 2000. The aircraft is equipped with the two PSLM DV-2 turbofan engines, each of them being rated at 2200 kg, and the normal take off weight of the aircraft is 7000 kg. The aerodynamic configuration is characterised by the moderate aspect ratio wing equal to 4 and the leading edge swept angle equal to 31 deg. with a camber changmg by means of leading and trailing edge flaps and strakes optimised for medium and high angles of attack (AOAs). The aircraft presents some interesting design features: the maximum design AOA=40 deg., capability of combining operational characteristics common to modern fighters; such as the optimum point performance speed at M=0.75-0.8 and the low speed performance typical for a basic trainer. The aircraft was built at the Yakovlev Design Bureau and it is on a flight test stage now. The AOA envelope including AOAs up to 42 deg. for a speed up to M=0.4 and AOAs up to 15 deg. for M=O.85 has been investigated. The paper presents some results of the aerodynamic investigations, which were necessary for solving the problems appearing during flight tests.