ОСОБЕННОСТИ ПРОЕКТИРОВАНИЯ СВЧ-КЛЮЧЕЙ В РАЗНЫХ КОНСТРУКТИВНО-ТЕХНОЛОГИЧЕСКИХ БАЗИСАХ

2020 ◽  
Vol 96 (3s) ◽  
pp. 627-630
Author(s):  
А.Д. Калёнов ◽  
И.И. Мухин ◽  
В.В. Репин
Keyword(s):  
High Frequencies ◽  
Basic Parameters ◽  
Parasitic Effects ◽  
Soi Cmos

Представляется сравнение СВЧ-ключей, проектируемых в разных конструктивно-технологических базисах: КНИ, КМОП, биполярные и GaAs. Определенные трудности существуют при разработке ключей на сверхвысоких частотах, в разных технологиях необходимо учитывать различные эффекты. Наличие паразитных эффектов сильно осложняет разработку. В статье приводится оценка влияния паразитных эффектов на основные параметры СВЧ-ключей в разных конструктивно-технологических базисах. The paper offers a comparison of microwave keys designed in different structural and technological bases: SOI, CMOS, bipolar and GaAs. There are some difficulties in developing the keys to the ultra-high frequencies, in different technologies it is necessary to consider various effects. The presence of parasitic effects greatly complicates the development. The article provides an assessment of the influence of parasitic effects on the basic parameters of microwave keys in different structural and technological bases.

scholarly journals Molecular Characteristics of Spontaneous Deletions in the Hyperthermophilic Archaeon Sulfolobus acidocaldarius

2003 ◽  
Vol 185 (4) ◽  
pp. 1266-1272 ◽  
Author(s):  
Dennis W. Grogan ◽  
Josh E. Hansen
Keyword(s):  
Consensus Sequence ◽  
Low Frequency ◽  
Sulfolobus Acidocaldarius ◽  
Nucleotide Sequence Analysis ◽  
Molecular Characteristics ◽  
Sequence Dependence ◽  
Stem Loop ◽  
High Frequencies ◽  
Hyperthermophilic Archaeon ◽  
Basic Parameters

ABSTRACT Prokaryotic genomes acquire and eliminate blocks of DNA sequence by lateral gene transfer and spontaneous deletion, respectively. The basic parameters of spontaneous deletion, which are expected to influence the course of genome evolution, have not been determined for any hyperthermophilic archaeon. We therefore screened a number of independent pyrimidine auxotrophs of Sulfolobus acidocaldarius for deletions and sequenced those detected. Deletions accounted for only 0.4% of spontaneous pyrE mutations, corresponding to a frequency of about 10−8 per cell. Nucleotide sequence analysis of five independent deletions showed no significant association of the endpoints with short direct repeats, despite the fact that several such repeats occur within the pyrE gene and that duplication mutations in pyrE reverted at high frequencies. Endpoints of the spontaneous deletions did not coincide with short inverted repeats or potential stem-loop structures. No consensus sequence common to all the deletions could be identified, although two deletions showed the potential of being stabilized by octanucleotide sequences elsewhere in pyrE, and another pair of deletions shared an octanucleotide at their 3′ ends. The unusually low frequency and low sequence dependence of spontaneous deletions in the S. acidocaldarius pyrE gene compared to other genetic systems could not be explained in terms of possible constraints imposed by the 5-fluoroorotate selection.

ИССЛЕДОВАНИЕ ПАРАМЕТРОВ СВЧ-АТТЕНЮАТОРОВ С УЧЕТОМ ВЛИЯНИЯ КОНСТРУКТИВНО-ТЕХНОЛОГИЧЕСКИХ БАЗИСОВ

2020 ◽  
Vol 96 (3s) ◽  
pp. 325-329
Author(s):  
А.Д. Калёнов ◽  
В.В. Репин ◽  
И.И. Мухин
Keyword(s):  
Microwave Frequencies ◽  
Basic Parameters ◽  
Parasitic Effects

Рассматривается сравнение параметров СВЧ-аттенюаторов, разрабатываемых в разных конструктивно-технологических базисах: КМОП, КНИ, биполярных и GaAs. Наличие паразитных эффектов на СВЧ-частотах накладывает определенные трудности при проектировании аттенюаторов: в разных технологиях необходимо учитывать различные эффекты. В статье приводится оценка влияния паразитных эффектов на основные параметры СВЧ-аттенюаторов в разных конструктивно-технологических базисах. The paper compares the parameters of microwave attenuators developed in different structural and technological bases: CMOS, SOI, bipolar and GaAs. The presence of parasitic effects on microwave frequencies imposes certain difficulties on the design of attenuators - in different technologies it is necessary to take into account different effects. The article gives an assessment of the parasitic effects influence on the basic parameters of microwave attenuators in different structural and technological bases.

Models of comets with strongly variable nongravitational effects

1999 ◽  
Vol 173 ◽  
pp. 381-387
Author(s):  
M. Królikowska ◽  
G. Sitarski ◽  
S. Szutowicz
Keyword(s):  
Cometary Nucleus ◽  
Spin Axis ◽  
Reactive Force ◽  
Orbital Elements ◽  
Cometary Nuclei ◽  
Short Period ◽  
Basic Parameters ◽  
Polar Radius ◽  
Cometary Activity ◽  
Nongravitational Effects

AbstractThe nongravitational motion of five “erratic” short-period comets is studied on the basis of published astrometric observations. We present the precession models which successfully link all the observed apparitions of the comets: 21P/Giacobini-Zinner, 31P/Schwassmann-Wachmann 2, 32P/Comas Solá, 37P/Forbes, and 43P/Wolf-Harrington. We used the Sekanina's forced precession model of the rotating cometary nucleus to include the nongravitational terms into equations of the comet's motion. Values of six basic parameters (four connected with the rotating comet nucleus and two describing the precession of spin-axis of the nucleus) have been determined along the orbital elements from positional observations of the comets. The solutions were derived with additional assumptions which introduce instantaneous changes of modulus of reactive force,Aand of maximum of cometary activity with respect to perihelion time. The present precession models impose some contraints on sizes and rotational periods of cometary nuclei. According to our solutions the nucleus of 21P/Giacobini-Zinner with oblateness along the spin-axis of about 0.32 (equatorial to polar radius of 1.46) is the most oblate among five investigated comets.

Quasi-Periodic Oscillations in Dwarf Novae

1979 ◽  
Vol 46 ◽  
pp. 77-88
Author(s):  
Edward L. Robinson
Keyword(s):  
Binary Systems ◽  
Outer Edge ◽  
Light Curves ◽  
Close Binary ◽  
Bright Spot ◽  
Dwarf Novae ◽  
Periodic Oscillations ◽  
High Frequencies ◽  
Short Period ◽  
Typical Time

Three distinct kinds of rapid variations have been detected in the light curves of dwarf novae: rapid flickering, short period coherent oscillations, and quasi-periodic oscillations. The rapid flickering is seen in the light curves of most, if not all, dwarf novae, and is especially apparent during minimum light between eruptions. The flickering has a typical time scale of a few minutes or less and a typical amplitude of about .1 mag. The flickering is completely random and unpredictable; the power spectrum of flickering shows only a slow decrease from low to high frequencies. The observations of U Gem by Warner and Nather (1971) showed conclusively that most of the flickering is produced by variations in the luminosity of the bright spot near the outer edge of the accretion disk around the white dwarf in these close binary systems.

Participants of the Global Oil Market

2003 ◽  
pp. 123-135
Author(s):  
D. Kokurin ◽  
G. Melkumov
Keyword(s):  
Asia Pacific ◽  
Oil Market ◽  
Oil Corporations ◽  
The Usa ◽  
Basic Parameters

The article deals with the leading participants of the global oil market and examines its basic parameters in 2002. The authors point out such demand-creating countries as the USA, the EU15 and the Asia Pacific, discuss their specifics as oil-consuming countries and their ability to influence the global oil market. The supply is provided by OPEC countries, US oil corporations and partly independent oil producers.

Monetary policy regimes in Russia: Guidelines for furtherquantitative studies

2017 ◽  
pp. 38-60 ◽  
Author(s):  
A. Pestova
Keyword(s):  
Monetary Policy ◽  
Exchange Rate ◽  
Interest Rates ◽  
Quantitative Research ◽  
Policy Regimes ◽  
Policy Effects ◽  
Exchange Rate Targeting ◽  
Basic Parameters

This paper analyzes the basic parameters of monetary policy in 2000-2015 in Russia. We provide the overview of tools and objectives of monetary policy of the Bank of Russia and identify the periods of homogeneity of monetary policy regimes: from money base targeting to exchange rate targeting and finally, to interest rates policy. On the basis of this research we develop the recommendations for further quantitative research aimed at estimation of monetary policy effects in Russia.

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