Photoemission method of analyzing the cathodoluminescence spectra of a solution with the aid of an electron microscope

Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 53, No. 2, pp. 247–252, August, 1990.     

Reaction <Emphasis Type="Italic">d</Emphasis> + <Superscript>2</Superscript>H → <Superscript>3</Superscript>He + <Emphasis Type="Italic">n</Emphasis> as a source of quasi-monoenergetic neutrons for studying the properties of neutron detectors

The responses of two liquid scintillators to neutron irradiation are investigated. Monoenergetic neutrons are obtained in the reaction d + ²H → ³He + n in different configurations of a coincidence experiment involving the detection of both neutrons and the ³He nucleus. In the experiment, the 15 MeV deuteron beam from the U-120 accelerator at the Skobeltsyn Institute of Nuclear Physics, Moscow State University, hits a target of deuterated polyethylene, and the secondary neutrons obtained in the reaction irradiate the EJ-301 and EJ-315 liquid scintillators under study.     

A study of the photoinduced conformational mobility of spin-labeled regenerated rhodopsin by ESR spectroscopy

Saturation transfer EPR spectroscopy is used to study the photoinduced conformational changes of spin-labeled (Cys140 and Cys316) rhodopsin in a photoreceptor membrane. Illumination of rhodopsin with “yellow” light (λ > 450 nm), converting it from the dark form into metarhodopsin II, a physiologically active form, is accompanied by an increase in the mobility of the cytoplasmic loop (Cys140) and eighth alpha-helix (Cys316), whereas the subsequent illumination with “blue” light (λ < 445 nm), which converts metarhodopsin II into a mixture of inactive photoregenerated products, results in a decrease in the mobility. The restoration of the specific features of the photoinduced changes in the conformational mobility of the cytoplasmic loops of rhodopsin regenerated in the dark is demonstrated.     

Low-Energy Parameters of Neutron–Neutron Interaction: Analysis of Data Obtained in <Emphasis Type="Italic">nd</Emphasis> and <Emphasis Type="Italic">dd</Emphasis> Breakup Reactions

Data obtained in recent years for the neutron–neutron scattering length in nd and dd breakup reactions are analyzed. Serious discrepancies between experimental data from different studies may be explained by the effect of three-nucleon forces depending on the velocity of separation of a neutron–neutron pair and a charged fragment. It is shown that the data under analysis can be approximated by a smooth curve representing the dependence of the scattering length on the parameter R, which determines the fragment-separation distance after a fixed time. This dependence makes it possible to obtain the scatteringlength value for R→∞—that is, in the absence of the effect of three-nucleon forces.     

Operator K-theory and its applications

A survey of basic technical constructions associated with the K-bifunctor is given along with main results obtained through it, statements of unsolved problems are given, some hypotheses are stated.Translated from Itogi Nauki i Tekhniki, Seriya Sovremennye Problemy Matematiki (Noveishie Dostizheniya), Vol. 27, pp. 3–31, 1985.     

Data on the Neutron–Neutron Scattering Length from the nd-Breakup Reaction at En = 8 MeV and En = 11 MeV

Physics of Atomic Nuclei - A kinematically complete experiment devoted to studying the $$nd$$ -breakup reaction at energies of 8 and 11 MeV via detecting all three secondary particles was...     

EPR spectroscopic and X-Ray diffraction studies of carbon fibers with different mechanical properties

The carbon fibers obtained by carbonization of polyacrylonitrile fibers were studied by electron paramagnetic resonance and X-ray diffraction analysis in the range of small and wide scattering angles. Their elastic and strength characteristics were also studied. The concentration of the paramagnetic centers was correlated with the mechanical properties of carbon fibers. The wide-angle X-ray diffraction study did not reveal essential structural differences in the carbon fiber samples with different mechanical properties. At the same time, the small-angle X-ray scattering study showed that the fiber nanostructures with different mechanical properties differ substantially.