scholarly journals DEVELOPMENT OF STRUCTURES FROM SOLID WOOD FOR OBJECTS OF INFRASTRUCTURE

2018 ◽  
Vol 14 (1) ◽  
pp. 145-154
Author(s):  
Konstantin P. Pyatikrestovsky ◽  
Vladimir I. Travush ◽  
Alexander A. Pogoreltsev ◽  
Alexander A. Klyukin
Keyword(s):  
Cross Section ◽  
Solid Wood ◽  
State University ◽  
Plastic Deformations ◽  
Strength Criteria ◽  
Lightweight Structures ◽  
Far North ◽  
Working Together ◽  
Wooden Structures ◽  
Moscow State University

New prefabricated lightweight structures made of solid wood with connections for joining and building metal screws for wood are proposed. Manufacture and assembly of basic elements-bars with a cross-section of 15x15 cm can be carried out in line conditions on the simplest woodworking equipment. The use of local tim-ber material has a number of advantages (ecological, economic and operational). The description of structures with manufacturing process, examples of buildings with vaulted and hipped roofing, connection arrangement, preparation of experimental samples with the use of new equipment of the National Research Moscow State University of Civil Engineering are given. The method of analysis with allowance for plastic deformations is under consideration. It provides additional economic advantages. The analysis is carried out by the method of integral estimates developed by Prof. V.M. Bondarenko for reinforced concrete structures and adapted to wooden structures by Prof. K.P. Pyatikrestovsky. Special strength criteria are used for the analysis of decks working together with the ribs (in a combined stressed state). It is planned to build buildings for various purposes in the ar-eas of development of the Far North of Russia.

scholarly journals Ускорение электронов E-=SUB=-0n-=/SUB=--волной в круглом волноводе в режиме циклотронного резонанса

2020 ◽  
Vol 90 (6) ◽  
pp. 1022
Author(s):  
В.Н. Пашенцев ◽  
М.В. Пашенцева
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Cross Section ◽  
Cyclotron Resonance ◽  
State University ◽  
Spiral Trajectory ◽  
Synchronous Rotation ◽  
E Mail ◽  
Moscow State University ◽  
The Magnetic Field

Pashentsev V.N.1, Pashentseva M.V.2 1 National Research Nuclear University MEPhI 115409 Moscow, Russia 2 Lomonosov Moscow State University 119991 Moscow, Russia e-mail: [email protected] A method for accelerating electrons in a smooth cylindrical waveguide placed in the magnetic field of a solenoid is proposed. The motion of electrons in the waveguide occurs along a spiral trajectory shifted from the center of the waveguide. Electrons are accelerated at the cyclotron resonance frequency by the E01 or E02 waves in the direction of the waveguide axis. It is shown that the acceleration occurs as a result of synchronous rotation of particles in the cross section of the waveguide and the movement of the wave along the waveguide axis. When the electric field is maximum and has an decelerating direction, the electrons are in the center of the waveguide. Through the half-period, the direction of the electric field in the center will be braking, so under the influence of the magnetic field, the electrons rotate to the wall of the waveguide in the region of a smaller value of the decelerating electric field. It is shown that during the period of rotation of electrons the total effect of interaction of electrons with a wave is accelerating. The parameters of the accelerator for the energy of 10 MeV are estimated.

scholarly journals Mathematical modeling of stress-strain state of the nodal joint of wooden beams

2021 ◽  
Vol 2131 (3) ◽  
pp. 032088
Author(s):  
M S Sergeev ◽  
M V Lukin ◽  
A A Strekalkin ◽  
S I Roshchina
Keyword(s):  
Cross Section ◽  
Sharp Increase ◽  
Static Load ◽  
Numerical Study ◽  
Solid Wood ◽  
Operating Conditions ◽  
Aluminum Composite ◽  
Different Types ◽  
New Type ◽  
Wooden Structures

Abstract The article presents a study of the joint of wooden beams on a new type of aluminum composite connector. For the numerical experiment, beams with a cross-section of 150x220(h) mm made of solid wood were selected. The beams were connected at the same level in a perpendicular direction to each other. The connecting connectors were made of two types of alloys: 7075 T6 and 6061 T6. The experiment was carried out until the joint was completely destroyed under static load. The elastic operation of the node for different types of connectors under study was maintained until the load of 50… 70 kN, after which there was a sharp increase in the deformations of the beams. Conducting a numerical study of the elements of wooden structures made it possible to predict their behavior most accurately in real operating conditions.

Peronosporales of Skadovsky Zvenigorod Biological Station (Moscow Region)

2018 ◽  
Vol 52 (1) ◽  
pp. 91-100
Author(s):  
E. Yu. Blagoveshchenskaya
Keyword(s):  
Downy Mildew ◽  
European Part ◽  
Moscow Region ◽  
State University ◽  
Biological Station ◽  
Annotated List ◽  
European Part Of Russia ◽  
First Time ◽  
Moscow State University

The paper provides the results of seven-year study of downy mildew on Skadovsky Zvenigorod Biological Station of Moscow State University (ZBS MSU, Moscow Region). A total of 29 species of Peronosporales (Oomycota) were revealed during the study. An annotated list of species is presented, among them Peronospora anemones is recorded for the first time for Russia, P. chelidonii and P. stachydis are new for the European part of Russia, 8 species are new for the Moscow Region.

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