Recent Papers

OBSERVATION OF INDIVIDUAL MOLECULES USING AN ELECTRON MICROPROJECTOR

A NEW VARIANT OF AN INTERFERENCE LIGHT FILTER

NEW LUMINESCENT COMPOSITION*)

MONOCHROMATORS

G. F. J. Garlick, Luminescent materials. Oxford, 1949, p. 254; G. Garlick, Luminescent Substances.

Mass Spectrometer for Cosmic Radiation

Multiple production of mesons and photons in cosmic-ray “stars”

THE GYROMAGNETIC RATIO FOR THE PROTON AND REFINEMENT OF THE VALUE OF $e/m$

MESONS FROM 335-MeV $\gamma$ RAYS

APPLICATION OF A COUNTER FOR THE STUDY OF SURFACE LAYERS OF METALS

Stability of Stable Isobars

G. Herzberg. Vibrational and Rotational Spectra of Polyatomic Molecules

NEUTRON DIFFRACTION IN GASES

Crystal counters

Neutrons in Cosmic Rays

Modern Pulsed Light Sources

On the Sixtieth Anniversary of the Birth of Academician G. S. Landsberg

First Conference on Astrospectroscopy

About 60 delegates representing 22 physics and astronomical institutions of our country took part in the conference proceedings.

Physics Books Published in 1949

On the Methodological Shortcomings of My Textbook *Mechanics*

Heavy Nuclei in Primary Cosmic Radiation

Fission of Nuclei with Mass Numbers 63–118

P. N. LEBEDEV’S WORKS ON INFRARED SPECTROSCOPY

NEW DATA ON THE ABUNDANCE OF ATOMIC NUCLEI\*

PUBLICATION OF THE COMPLETE WORKS OF M. V. LOMONOSOV

A VISUAL MODEL OF THE ATOMIC NUCLEUS

A New Type of Microwave Amplifier

The amplification and generation of centimeter and decimeter radio waves are important problems in modern microwave radio engineering. The new type of microwave amplifier and generator described in the present article, based on the interaction of parallel electron streams having different average ve…

Focusing of Ultrasound in Water by a Concave Mirror

Nuclear Transformations under Bombardment by High-Energy Particles

This article provides a brief overview of experimental data and theoretical reports concerning nuclear transformations under bombardment by high-energy particles. It is expedient to divide all the material into two parts, according to the two types of nuclear transformations characteristic of cases …

DIRECT MEASUREMENT OF THE SIZES OF ORGANIC MOLECULES BY AN OPTICAL METHOD

CRYSTAL $\gamma$-SPECTROMETER

LUMINESCENCE AND THE LAWS OF SPECTRAL TRANSFORMATION OF LIGHT

PROOF OF THE PRODUCTION OF NEUTRAL MESONS BY PHOTONS

NEUTRONOGRAPHY OF LIQUIDS

FRACTURE PHENOMENA IN CRYSTALLINE AND AMORPHOUS BODIES

X-RAY MICROSCOPE*)

LINEAR ACCELERATORS

On the Phase Contrast Method in Microscopy\*

A lecture delivered at the colloquium of the P. N. Lebedev Physical Institute of the Academy of Sciences of the USSR.

URANIUM-235 IN THUCHOLITE

INTERFEROMETER FOR MEASURING DIELECTRIC PERMITTIVITY AND LOSSES IN THE CENTIMETER-WAVE RANGE *)

OBSERVATION OF ANTIFERROMAGNETISM BY NEUTRON DIFFRACTION METHODS

Operation of Crystal Triodes in the Frequency Range 5–25 MHz

Environment and the Variability of Microorganisms

PAUL LANGEVIN—AN OUTSTANDING FRENCH MATERIALIST PHYSICIST

A New Method for Producing Molecular Beams

OBSERVATION OF MESOTRON PAIR PRODUCTION\*)

Conference on Molecular Spectral Analysis

On October 24–27, 1949, a city conference on molecular spectral analysis was held at the Leningrad A. A. Zhdanov State Order of Lenin University.

In the review of the first edition of this book (UFN 31, 153 (1947)) it was already noted what a favorable impression it made as a very good and serious textbook, and at the same t

Congresses, Meetings, Conferences, Scientific Societies

NEW DECAYING PARTICLES IN COSMIC RAYS