Edge Channel Interference Controlled by Landau Level Filling

We study the visibility of Aharonov-Bohm interference in an electronic Mach-Zehnder interferometer (MZI) in the integer quantum Hall regime. The visibility is controlled by the filling factor $\nu$ and is observed only between $\nu \approx 2.0$ and 1.0, with an unexpected maximum near $\nu=1.5$. Three energy scales extracted from the temperature and voltage dependences of the visibility change in a very similar way with the filling factor, indicating that the different aspects of the interference depend sensitively on the local structure of the compressible and incompressible strips forming the quantum Hall edge channels.Comment: 5 pages, 5 figures, final version accepted for publication in Phys. Rev.

AUTOPARAMETRIC STABILIZER OF OSCILLATION AMPLITUDE

A method of automatic maintenance of vibration amplitude of a number of mechanisms at given level, when exiting force amplitude is varied greatly is given. For this purpose a pendulum is attached to a mechanism through a viscoelastic hinge. Load of a pendulum can move along an arm and it is viscoelastic connected to it

Controllable beam shaping of coherent and incoherent beams by a laser amplifier

We propose the technique for a controllable manipulation of the transverse intensity distribution of an output beam by the temporal adjustment of a transverse gain profile in a laser amplifier. It was created by an independent manipulation of the output powers of each of the two pump diodes. The output beam of the laser amplifier is able to vary both the output power and the transverse intensity distribution. Additionally, it was shown experimentally that this technique is valid for the case of incoherent laser beam shaping

Search for Spatial Structures at Scales Z~1. III. The Effect of Lensing on QSO ?

We carried out a search for peak inhomogeneities in the distribution of matter - namely clumps and voids, within the range Z ~ 1-3. We used a new method, based on the lensing of quasars by a combination of lenses, belonging to the above sought inhomogeneities in the matter distribution. This work confirms the evidence of the existence of inhomogeneities found by us earlier - of a clump (superattractor N.1), and of a void (supervoid). Besides, the existence of a new gigantic clump (superattractor N.2) was also discovered at Z ~ 3. These clumps could well serve as centers of the Bose-condensation in the early Universe; in particular - as Anselm's arion condensate, which leads to the formation of quasiperiodic structures with a period p ~ 100-200 Mpc.Comment: 22 pages, 2 figures, 6 tables. submitted to Astrophys.& Space Sc

Dnevnik istorkia S. A. Piontkovskogo

https://scholarship.richmond.edu/bookshelf/1099/thumbnail.jp

Ion composition measurements and modelling at altitudes from 140 to 350 km using EISCAT measurements

International audienceThis work aims at processing the data of CP1 and CP2 programs of EISCAT ionospheric radar from 1987 to 1994 using the "full profile" method which allows to solve the "temperature-composition" ambiguity problem in the lower F region. The program of data analysis was developed in the CEPHAG in 1995–1996. To improve this program, we implemented another analytical function to model the ion composition profile. This new function better reflects the real profile of the composition. Secondly, we chose the best method to select the initial conditions for the "full profile" procedure. A statistical analysis of the results was made to obtain the averages of various parameters: electron concentration and temperature, ion temperature, composition and bulk velocity. The aim is to obtain models of the parameter behaviour defining the ion composition profiles : z50 (transition altitude between atomic and molecular ions) and dz (width of the profile), for various seasons and for high and low solar activities. These models are then compared to other models. To explain the principal features of parameters z50 and dz, we made an analysis of the processes leading to composition changes and related them to production and electron density profile. A new experimental model of ion composition is now available

Availability of Russian archives and illusion of the source study updating: What Russian and foreign researches dealing with the documents should know

© Serials Publications.The relevance of the investigated problem is caused by the ability to publish new documents and entire archive funds and write the objective Russian history on their basis. The purpose of this article is to clarify the authenticity of the documents studied herein. The leading approach to the study of this problem is the critical analysis of the materials of the classics of Marxism-Leninism and the documents of the Communist Party of the Soviet Union, allowing presentation of the real picture of the historical processes that took place in our country. The article discovers the main stages of documents and funds, reveals the extent of their validity and the possibility of studying by historians, justifies questions, which were not fully covered, provides the ways of implementation of emerging opportunities. Materials may be useful in the study of Russian history of the Soviet period, when writing books and articles