Results 21 to 30 of about 96,218 (256)

Features of structural and technological solutions for receiving system of small radio telescopes

Tekhnologiya i Konstruirovanie v Elektronnoi Apparature, 2016
The article presents new technological solutions and structural approaches for design of radiometric receiving systems for small diameter antennas. Problems which need to be dealt with in the process of realization of such systems are formulated. All the
E. N. Gluschechenko, A. M. Pylypenko, E. V. Slonin, I. K. Sunduchkov, V. V. Chmil   +4 more
doaj   +1 more source

Impact of the turbulence modeling approach on the accuracy of the fan noise level prediction

Вестник Самарского университета: Аэрокосмическая техника, технологии и машиностроение, 2018
The fan is the dominant source of noise for modern high bypass ratio aircraft engines. The article presents the results of investigating the influence of the approach to modeling the turbulence in modeling fan stage noise generation on the results of ...
K. R. Pyatunin, N. V. Arkharova
doaj   +1 more source

Research of the operability of an air-fuel lubrication and cooling system of gas turbine engine rotor bearings

Вестник Самарского университета: Аэрокосмическая техника, технологии и машиностроение, 2019
The article is devoted to the problem of ensuring the operability of air-fuel lubrication and cooling systems for gas turbine engine (GTE) rotor bearings. The paper considers one of the advanced designs of a GTE in which an air-fuel mixture obtained in a
V. N. Klimov, D. Ya. Dud’ev, V. Ya. Sigaylo, N. I. Klimov, Yu. K. Mashkov   +4 more
doaj   +1 more source

Forecasting low-cycle fatigue life of gas-turbine engine parts by the method of equivalent tests for specimens with stress concentrator under extension-compression

Вестник Самарского университета: Аэрокосмическая техника, технологии и машиностроение, 2018
A method of low-cycle fatigue equivalent tests based on the application of test specimens whose stress-strain state shall be similar to the stress-strain state of the part to be investigated is proposed in the paper.
S. A. Bukatyy, A. V. Pakhomenkov, G. A. Solntsev, A. S. Bukatyy   +3 more
doaj   +1 more source

Man's transportation to space [PDF]

, 1964
Saturn i, saturn ib, and saturn v launch ...
Rees, E.
core   +1 more source

Absorption‐Dominant Electromagnetic Interference Shielding of Ti3C2Tx MXene‐Coated and Fe3O4‐Integrated TPMS Composites with Coupled Gradient Conductivity and Size‐Graded Structure

Advanced Science, EarlyView.
A functionally driven variable‐cell size and gradient‐conductive coated TPMS structure was developed. Accordingly, stepwise longitudinal gradient impedance was realized, achieving absorption‐dominant EMI shielding (absorptivity≈0.85) with an EMI SET of ≈ 59 dB, for 10 mm‐thick composites. Further increasing the thickness of composites to 20 mm achieved
Abdallah Kamal, Baosong Li, Dawei Zhang, Muhammad Mujtaba Syed, Adam Otabil, Faisal Shahzad, Lianxi Zheng, Kin Liao   +7 more
wiley   +1 more source

Was the northern hexagon of Saturn seen from Earth before Voyager 1? Further researches. [PDF]

Cultural Heritage and Modern Technologies
Saturn's atmospheric boreal hexagon, discovered by the Voyager 1 probe in 1981, has such dimensions – sides km. 13800; total extension in length almost km.
Ferreri W., Codebo M., Bubbi B., De Santis H., Citernesi L.   +4 more
doaj   +1 more source

Plaque Morphology‐Dependent Regression of Tandem Coronary Plaques Under Intensive Lipid‐Lowering Therapy

Catheterization and Cardiovascular Interventions, EarlyView.
ABSTRACT We report a 54‐year‐old woman with stable angina who exhibited heterogeneous responses of tandem left anterior descending artery (LAD) plaques to intensive lipid‐lowering therapy. Coronary CT angiography performed at another hospital suggested diffuse disease, and she presented to our clinic for a second opinion.
Yong‐Lee Kim, Hyoun‐Woo Noh, Chang‐Ok Seo, Jeong Rang Park, KyeHwan Kim, Hye Ree Kim, Jin‐Yong Hwang, Min Gyu Kang, Hangyul Kim, Jin‐Sin Koh   +9 more
wiley   +1 more source

Sodium Tetraazidoaurate(III)—From Na[AuCl4]·2H2O to Na[Au(N3)4] and Beyond One Step at a Time

Chemistry – A European Journal, EarlyView.
Novel sodium chlorido‐/azidoaurate(III) dihydrates Na[AuCl4–x(N3)x]·2H2O (x = 0, 1, 2, 3, 4) provide the first example of a complete series of gradual substitution on tetramer complex anions to be described. Controlled dehydration of Na[Au(N3)4]·2H2O leads to Na[Au(N3)4]·H2O and Na[Au(N3)4], the latter being a highly explosive material.
Mehmet Somer, Joannis Psilitelis, Raul Cardoso‐Gil, Thomas Doert, Franziska Jach, Ayberk Yılmaz, Alexander Ovchinnikov, Yurii Prots, Helge Rosner, Marcus P. Schmidt, Peter Höhn   +10 more
wiley   +1 more source

Generalized Chemical Model for Warm Dense Hydrogen: Ionization Potential Depression and Molecular Dissociation Shifts

Contributions to Plasma Physics, EarlyView.
ABSTRACT Warm dense matter (WDM) is a complex state, where quantum effects, thermal excitations, and strong interparticle correlations coexist. Understanding its microscopic composition and medium‐induced modifications of atomic and molecular properties is essential for planetary modeling, fusion research, and high‐energy‐density experiments.
L. T. Yerimbetova, Yu. V. Arkhipov, Ye. S. Mukhametkarimov, A. E. Davletov, I. M. Tkachenko   +4 more
wiley   +1 more source