Recent Papers

On the Effect of Heat Treatment of Food Products on the Survival of bac. coli and bac. proteus in Them

Application of X-rays to the Study of Molecular Structure

Installation of a Large Concave Diffraction Grating at the State Optical Institute in Leningrad

SECONDARY ELECTRON EMISSION OF METALS UNDER ELECTRON BOMBARDMENT

THE MANY-BODY PROBLEM IN QUANTUM MECHANICS

EXPERIMENTAL VERIFICATION OF THE THEORY OF $\beta$-DECAY

ACOUSTIC RESEARCH AT THE NATIONAL PHYSICAL LABORATORY*

N. Seménoff. Chemical Kinetics and Chain Reactions, 480 pp., Oxford Press, 1935, Sh. 35.

N. Semenov. Chemical Kinetics and Chain Reactions.

METHODS OF SPECTRAL SENSITOMETRY

Nuclear Photoelectric Effect

PROBLEMS OF THE NEW QUANTUM THEORY OF THE ELECTRON\*

CHEMICAL DETECTION OF ARTIFICIAL TRANSFORMATION OF ELEMENTS

Anomalous Secondary Emission

SCALE OF FREQUENCIES AND WAVES OF ELECTROMAGNETIC OSCILLATIONS; CLASSIFICATION AND TERMS\*

D. E. RICHMOND, *The Dilemma of Modern Physics.

Siberian Devonian and the Spirifer cheehiel Kon group

This paper examines the Devonian brachiopod group Spirifer cheehiel in Siberia, using collections from the Kuznetsk Basin, Altai, and Minusinsk Basin together with published records. It analyzes the group’s horizontal and vertical distribution, its taxonomic distinctiveness within Spirifer, and its …

On the Optimal Average Pressure in an Air-Pipeline Network and the Optimal Pressure at the Compressor for Existing Installations

This paper addresses the determination of the energy minimizing average pressure in compressed air pipeline networks and the corresponding optimal compressor pressure for existing installations. It formulates total losses as the sum of leakage, frictional pressure loss, and, in some cases, cooling l…

Determination of the electromotive force of reaction with metals as a method for studying organic compounds

This paper proposes measuring the electromotive force generated when organic compounds react with metals, chiefly sodium, as a practical method for studying functional group activity, molecular structure, mixtures, and purity. The authors motivate the approach by comparing it with established physic…

On the Nature of Complexes of Phenols with Amines

This study examines the activity and probable composition of complexes formed by phenol and substituted phenols with amines, using the electromotive force produced during reaction with metallic sodium as the comparative measure. Experiments in benzene, pyridine, and related media show that phenol fo…

Complexes of Nitro Compounds of the Benzene Series with Acids

This study investigates whether nitro derivatives of benzenoid hydrocarbons form complexes with aliphatic carboxylic acids and how such complexes alter the activity of acidic hydrogen toward metallic sodium. Using electromotive force measurements in the sodium reaction, mainly in benzene solution, t…

On the Mobility of Halogens in Polyhalogenated Organic Compounds

This study tests theoretical propositions concerning the dependence of halogen mobility in organic compounds on molecular structure by measuring halogen elimination rates in a series of polyhalogenated methane, ethane, and propane derivatives. Reactions were followed at room temperature with alcohol…

Complex Compounds of Amylpyridinium Bromide and Benzylpyridinium Chloride with Heavy Metal Salts

This paper investigates complex compounds formed by amylpyridinium bromide and benzylpyridinium chloride with halides of heavy metals, in the context of developing organic reagents for analytical chemistry. The study prepares crystalline products by mixing concentrated aqueous solutions of quaternar…

A New Conductometric Method for Determining Magnesium in the Presence of Alkalis

This paper presents a conductometric method for determining magnesium in solutions containing alkali sulfates, addressing the limitations of gravimetric procedures and earlier conductometric titrations. Experiments show that titration with barium hydroxide in purely aqueous solution does not give a …

Calculation of Voltages and Power Flow Distribution in Complex Electric Power Systems under Normal Operating Conditions

This paper surveys and compares methods for calculating node voltages and power flow distribution in complex high-voltage electric power systems under normal operating conditions. It argues that direct exact calculation with nodal equations leads to second-degree systems because loads are specified …

Improvement of cos ? in metalworking plants

This paper examines the causes of low power factor in metalworking plants and evaluates methods for improving it. It analyzes the influence of motor size, load factor, simultaneity of operation, operating regimes, crane loads, transformer loading, and receiver selection, using formulas, design data,…

Protection of Generators

This article examines methods for increasing the sensitivity and selectivity of generator protection against stator ground faults, emphasizing the limitations of conventional AEG differential wattmetric protection. It analyzes the role of current-transformer unbalance in setting protection sensitivi…

Motion of a Body on an Inclined Plane with Vertical Circular Rolling

This paper analyzes the motion of a body on an inclined plane whose points execute vertical circular oscillations, a mechanism relevant to conveying and sorting in agricultural and mineral-processing machines. Assuming a constant coefficient of friction, it derives conditions for the onset of downwa…

Kinematic and dynamic study of the rake mechanism of self-dumping headers

This paper analyzes the rake mechanism of self-dumping headers as a spatial cam mechanism with a stationary guide track and swinging rake bracket, focusing on the kinematic and dynamic conditions that affect smooth operation. Using the rake apparatus of the Lyubertsy Plant as an example, it records …

Operation of a Cylindrical Milling Cutter

This experimental study examines how cutting conditions and cutter geometry affect the work and power required in cylindrical milling, with particular attention to the disputed influence of the helix angle of a helical tooth. Rozenberg tests a previously proposed theory using two parallel methods: a…

Transition Points of Elementary Substances on a Logarithmic Temperature Scale

This paper proposes representing thermodynamic transition temperatures of chemical elements on a decimal logarithmic absolute temperature scale, motivated by the proportionality between gas temperature and molecular kinetic energy. Using tabulated melting points, normal boiling points, and critical …

Shift of Critical Speeds

This paper examines how dangerous critical speeds in piston engine shafting arise from resonance between torque harmonics and natural torsional vibration frequencies, with particular attention to shipboard installations whose operating ranges cannot easily avoid resonance. It reviews practical means…

Projection onto three planes

The paper proposes a modification of the descriptive geometry method of changing projection planes, aimed at making auxiliary views easier to compare with the original projections and less likely to exceed the drawing area. It introduces a system of three projection planes in which the added plane i…

Orthogonal Axonometric Diagram

The paper proposes an orthogonal axonometric epure intended to integrate conventional orthogonal projections with an axonometric image in a single constructive scheme. It introduces an inclined third projection plane within the right dihedral angle formed by the horizontal and vertical projection pl…

Graphical-Analytical Proof of Castigliano’s and Betti’s Theorems

This paper presents graphical and analytical proofs of Castigliano’s theorem and Betti’s reciprocal theorem for elastic systems obeying Hooke’s law and the principle of superposition. It develops load displacement diagrams for sequential and proportional loading, expresses the system’s potential ene…

Influence method for the analysis of beams

This article presents an “influent” method for calculating beam reactions, fixed-end moments, rotations, and deflections, aiming to simplify and accelerate the treatment of statically determinate and indeterminate beams under varied loading. The method reduces beam systems to conditional cantilevers…

On determining the smallest exponent ?, for which the expression X?-1 is divisible by the polynomial F(x)=xn+a1xn-1+a2xn-2+an-1x+an, modulo a prime P

This paper studies the least exponent \(\omega\) for which \(x^\omega-1\) is divisible modulo a prime \(p\) by a polynomial \(F(x)\). It derives a recurrence for the quotient coefficients in the division by \(F(x)\), relates these coefficients to symmetric functions of the roots, and shows that exac…

On the Computation of Derivatives of Sums of Equal Powers of Roots from the Coefficients of Algebraic Equations

The paper studies derivatives, with respect to coefficients, of power sums of the roots of a monic algebraic equation. Introducing \(u_k=(k+1)^{-1}\partial S_{k+1}/\partial a_1\), the authors show that these quantities satisfy the same linear recurrence determined by the equation’s coefficients as t…

Secular Perturbation of Ceres by the Eight Influential Planets

This preliminary communication reports calculations of the first order secular perturbations of Ceres caused by eight major planets, as part of a broader effort to construct a theory of Ceres’s motion. The paper applies Halphen’s formulation of Gauss’s ring method, using elliptic and hypergeometric …

Academic Affairs at the Tomsk Industrial (Technological) Institute over the Last 10 Years (1925-1935)

VIBRATIONS OF POLYATOMIC MOLECULES AND THEIR STUDY USING GROUP THEORY

Current State of the Theory of Ferromagnetism

Approximately three thousand years have passed since the discovery of natural magnets and their properties. For centuries, ferromagnetism stubbornly resisted theorists’ attempts to penetrate this field, and even at present theory lags far behind experiment in this area. However, over the past 5–10 y…

A. Zhukhovitsky, Moscow

CALORIMETRIC STUDIES AT VERY LOW TEMPERATURES\*

Report read at the French Physical Society on April 10, 1934.

Objective Photometry

OPTICAL PROOF OF PIEZOQUARTZ OSCILLATIONS AT OVERTONES

Pair emission of positron annihilation radiation

Thermodynamics of Electrical Phenomena in Metals

METHODS AND RESULTS OF ISOTOPE RESEARCH\*

Electric Discharge in Gases: Physics and Technology

Electromagnetic Processes in Metals