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Showing 50 of 25456 papers
Study of the Working Process of an Electric Demolition Hammer with an Elastic (Air) Coupling
This paper examines the working process of an electropneumatic demolition hammer in which the striker and piston are coupled by compressed air rather than a mechanical spring. It formulates coupled nonlinear equations for striker motion and motor or crank motion, allowing for nonuniform motor rotati…
The Phenomenon of Preliminary Displacements When a Roller Starts from Rest
This paper examines whether preliminary displacements, previously discussed for sliding friction, also occur in rolling friction when a roller starts from rest. The authors describe an apparatus with two steel cylindrical rollers between fixed and movable cast-iron plates, applying a gradually incre…
Six-Link Articulated Mechanisms
This paper examines exceptional six-link spatial closed chains with revolute joints, which are generally rigid by the standard mobility count but can become mechanisms under special geometric conditions. It classifies known examples into a first group with two pencils of adjacent hinge axes, then pr…
The Hypothesis of Broken Sections and Its Application to the Calculation of Rods of Complex Configuration
This paper develops an approximate method for calculating stresses in rods of variable cross section and complex outline, motivated by the inadequacy of prismatic beam formulas for parts such as gear teeth, hooks, grooves, and fillets. It introduces the hypothesis of broken sections for straight rod…
J. W. Gibbs. Elementary Principles in Statistical Mechanics
ELECTROLYTIC SELENIUM PHOTOCELL
Problems of Inelastic Deformation of Metals\*
In all areas of research, it is useful from time to time to assess the possibilities offered by various directions for further work. Such an assessment is of particular importance in the field of plastic deformation and fracture of metals, owing to the large number of variable factors in experiments…
Recent Works in the Field of High Pressures\*
Recent Work in the Field of High Pressures\*
ALEKSEI IOSIFOVICH BACHINSKY
Ultrasonic Echolocation in Bats
X-RAY SPECTRA AS A METHOD FOR STUDYING THE DISTRIBUTION OF ELECTRONS OVER STATES
ELECTRONIC PROCESSES IN REAL CRYSTALS
Gas Conductors: Theory and Technical Applications
Book review: J. Cobine. Gaseous Conductors. Theory and Engineering Applications.
The Current State of the Question of the Nature of the Solar Corona
NEWTON’S OPTICAL WORKS¹
A report delivered at the general meeting of academicians in Borovoe on January 16, 1943.
THEORY OF RADIO WAVE PROPAGATION IN THE IONOSPHERE
The design of the book—in particular, the quality of the illustrations and paper—leaves something to be desired.
Book Review: N. D. Papaleksi. Radio Interference and Its Suppression.
100-Million-Volt Induction Electron Accelerator\*
Handbook of Military Optics
EFIM MIKHAILOVICH STUDENKOV
Among the Russian-language literature on quantum mechanics, Prof. D. I. Blokhintsev’s _Introduction to Quantum Mechanics_ is, in essence, the first university textbook to present t
Book review: D. I. Blokhintsev. Introduction to Quantum Mechanics.
Alexander Stepanovich Popov
Alexander Stepanovich Popov, who 50 years ago constructed the world’s first radio receiving installation, lived a life outwardly uncomplicated but rich in scientific content.
Once Again on Inertial Forces[^1]
Electro-optics of Molecular Vibrations
MECHANICS OF MOLECULAR VIBRATIONS
TABLE OF ISOTOPES\*
The following table gives a complete list of all artificial and naturally radioactive, as well as stable, isotopes known before June 1, 1944, and some of their most important properties.
THE PHYSICS CABINET.—THE PHYSICS LABORATORY.—THE PHYSICS INSTITUTE OF THE ACADEMY OF SCIENCES OVER 220 YEARS*)
Report delivered on June 12, 1945, at the ceremonial meeting of the Academic Council of the P. N. Lebedev Physical Institute of the Academy of Sciences of the USSR on the occasion of the Institute’s 220th anniversary.
Awarding of the Stalin Prizes for 1945
At the Commission on the History of the Physical and Mathematical Sciences of the USSR Academy of Sciences\*
X-RAY SPECTRA AS A METHOD FOR STUDYING THE DISTRIBUTION OF ELECTRONS AMONG STATES\*
THE PHYSICS OF LUCRETIUS\*)
A report at the joint session of the Division of Physical and Mathematical Sciences and the Division of History and Philosophy of the Academy of Sciences of the USSR in February 1946 on the occasion of the 2000th anniversary of the death of Lucretius.
Microwaves
On the Work of the 1944 Pamir Expedition of the Lebedev Physical Institute of the Academy of Sciences for the Study of Cosmic Radiation[^1]
A lecture delivered on June 12, 1945, at the ceremonial meeting of the Academic Council of the P. N. Lebedev Physical Institute of the Academy of Sciences of the USSR (FIAN), on the occasion of the Institute’s 220th anniversary.
A. G. Stoletov, _Collected Works_, edited and annotated by Prof. A. K. Timiryazev, vol. II, _Popular Lectures and Speeches, Critical and Biographical Notes_. State Publishing House
The book under review\ is the first part of a five-volume course of theoretical physics planned by Professor Landau. In the introduction it is therefore preceded by a definition of
Review of the book: L. Landau and L. Pyatigorsky. Mechanics.
Interference Phenomena in the Scattering of Slow Neutrons
The authors considered the interactions of neutrons with thermal vibrations of lattice atoms, the influence of spin and the isotopic composition of nuclei, and other factors affecting scattering processes. The result of this series of works was new criteria for the basic regularities of neutron scat…
MODERN THEORY OF METALLIC BODIES\*)
Revised text of the report delivered on 7/XII-45 at the Chemical Division of the Academy of Sciences of the USSR as the first Kurnakov Lecture.
Difficulties in the Theory of Radiation
Prof. Ya. M. Katushev and Docent V. I. Sheberstov. _Fundamentals of the Theory of Photographic Processes._ 396 pp. State Publishing House of Light Industry. Moscow, 1944. Price 18
Review of the book: Prof. Ya. M. Katushev and Assoc. Prof. V. I. Sheberstov. Fundamentals of the Theory of Photographic Processes.
Spectroscopy in the Vacuum Ultraviolet Region of the Spectrum
F. Seitz, Physics of Metals, McGraw-Hill Book Company, N. Y.—London, 1943, 330 pp.
Book review: F. Seitz. Physics of Metals, McGraw-Hill Book Company.
Modern Research in the Field of High Pressures*)
Session of the Division of Physical and Mathematical Sciences of the USSR Academy of Sciences
CHEMICAL AND RADIOACTIVE PROPERTIES OF HEAVY ELEMENTS\*
The article is a report delivered on November 16, 1945, at the Conference on Nuclear Chemistry at the Technological Institute of Northwestern University, Evanston, Illinois, USA.