126 research outputs found
Geophysical noise in the virgo gravitational antenna
No full textThe possibility of obtaining geophysical information from the system for controlling the position of the mirrors of the VIRGO laser-interferometric gravitational antenna and from angular perturbations of the vertical mirror lines is examined. Results from a study of tidal horizontal deformations are analyzed. © 2009 Springer Science+Business Media, Inc
Glaciers of Avacha group of volcanoes in Neoholocene
Get PDFThe study of moraines at the Avacha volcano group revealed that glaciers changes at all volcanoes within the group happened almost synchronously. Glacial deposits could be grouped into three generations, corresponding to three periods of glacier fluctuations in Neoholocene. The largest glaciation within the group occurred ~2000 years ago. Fragments of moraine, corresponding to that period were found only in the moraine complex of the Ditmar Glacier which was 15% larger then today at that time. The most of moraines at the Avacha volcano group were formed during the Little Ice Age, which in the studied region continued up to the first decades of XX centuries. The maximal advance of glaciers probably happened in XVII century. The moraine corresponding to that period was found at the Kozelsky Glacier valley. At present time the total area of glaciers which moraines were described and dated approaches 21.46 km2. The area of reconstructed moraines corresponding to the Little Ice Age is estimated to be 2.79 km2, therefore at that period the total glaciation area reaches 24,25 км2 exceeding the present area by 13%. It could be claimed that in general during the time past the Little Ice Age the glaciation nature and glacier types did not change sufficiently. The rate of glacier degradation at various parts of the group is different and depends mainly on exposition. At the valleys of four glaciers we found moraines formed in the middle of XX century. They may appear in 1941–1952 when the unfavorable weather conditions leaded to stable negative anomalies in accumulation have happened
GLACIERS OF THE KORYAK VOLCANO
No full textThe paper presents main glaciological characteristics of present-day glaciers located on the Koryaksky volcano. The results of fieldwork (2008–2009) and high-resolution satellite image analysis let us to specify and complete information on modern glacial complex of Koryaksky volcano. Now there are seven glaciers with total area 8.36 km2. Three of them advance, two are in stationary state and one degrades. Moreover, the paper describes the new crater glacier
Problems of Control and Information Theory
Get PDF1972 / 1. szám
Gavrilov, M. A.: Theoretical problems of practical application of finite automaton theory
Bunich, A. L. - Rajbman, N. S.: A dispersion equation of nonlinear plant identification
Csibi, S.: On iteration rules with memory in machine learning
Gulyás, O.: On extended potential function type learning algorithms and their convergence rate
Pugachev, V. S.: Stochastic systems and their connections
Voronov, A. A. - Chistyakov, Yu. V.: Approximate methods of description of one-channel queueing system
1972 / 2. szám
Sotskov, B. S.: Measurements and information measurement systems
Sinitsin, I. N.: On a generalization of the statistical linearization method
Keviczky, L.: The sequential evaluation of linear simplex design
Shaykin, M. E.: Invariant estimates in the statistical theory of optimal systems
Kocsis, J.: A possible use of adaptive programming
Dobrovidov, A. V.A A nonsupervised algorithm of asymptotically optimal filtering of random signals with an unknown a priori distribution
Fritz, J.: On the characteristic properties of generalized entropy
1972 / 3-4. szám
To the memory of B. S. Sotskov
Gelfand, S. I. - Dobrushin, R. L.: The complexit of asymptotically optimal code realization by constant depth schemes
Gabasov, R. F. - Zhevniak, R. M. - Kirillova, F. M. - Kopeikina, T. B.: Conditional observability of linear systems
Samoilenko, S. I.: Binoidal error-correcting codes
Győrfi, L.: Convergence of potential function type learning algorithms
Leonov, Yu. P.: The problem of dynamic systems identification in factor space
Boyarinov, I. M.: On the linear error-locating codes
Bányász, Cs. - Gertler, J.: On two methods of a discrete system identification
Stefaniuk, V. L. - Kotliar, S. B.: On a simple scheme of the interaction of the collective members
Milenin, N. K.: Optimal linear predistorting and correcting in the information transmission system with additional noise
Whittle, P.: A sequential treatment of information transmission
M. S. Pinsker - V. N. Koshelev: On the Second International Symposium on Information Theor
Technical Physics V. 47, I. 03
No full textTechnical Physics -- March 2002
Volume 47, Issue 3, pp. 281-373
ATOMS, SPECTRA, RADIATION
Atomic Hydrogen Cooling under Adiabatic Expansion in a Magnetic Trap
V. F. Ezhov, E. K. Izrailov, G. B. Krygin, M. M. Nesterov, and V. L. Ryabov
pp. 281-285 Full Text: PDF (110 kB)
GASES AND LIQUIDS
On the Motion of a Uniformly Heated Drop in a Viscous Liquid under Gravity
N. V. Malai
pp. 286-290 Full Text: PDF (63 kB)
The Effect of Volatility on the Thermophoretic Motion of a High-Viscosity Sphere in a Binary Gaseous Mixture with Regard for Thermodiffusion and Stefan Effects
S. N. D'yakonov, L. V. Kotlyarova, and Yu. I. Yalamov
pp. 291-298 Full Text: PDF (95 kB)
On the Interaction between a Charged Drop and an External Acoustic Field
A. I. Grigor'ev, A. P. Gaibov, and S. O. Shiryaeva
pp. 299-305 Full Text: PDF (86 kB)
The Effect of the Evaporation Coefficient on the Thermophoresis of a Volatile Single-Component Drop in a Binary Gas Mixture
S. N. D'yakonov, É. V. Efremov, and A. A. Morozov
pp. 306-312 Full Text: PDF (85 kB)
GAS DISCHARGES, PLASMA
Probe Measurements in a Discharge with Liquid Nonmetallic Electrodes in Air at Atmospheric Pressure
Yu. A. Barinov and S. M. Shkol'nik
pp. 313-319 Full Text: PDF (92 kB)
SOLIDS
The Non-Hooke's Behavior of Porous Zirconia Subjected to High-Rate Compressive Deformation
S. N. Kul'kov, V. I. Maslovskii, S. P. Buyakova, and D. S. Nikitin
pp. 320-324 Full Text: PDF (233 kB)
Properties of Nonstoichiometric Sodium Niobate
L. A. Reznichenko, L. A. Shilkina, O. N. Razumovskaya, I. V. Pozdnyakova, E. M. Kuznetsova, and S. I. Dudkina
pp. 325-329 Full Text: PDF (81 kB)
RADIOPHYSICS
The Ultimate Sensitivity of a High-Temperature Microwave SQUID Magnetometer Operating in the Hysteresis Regime
O. G. Vendik and I. S. Danilov
pp. 330-334 Full Text: PDF (65 kB)
Generation of Subnanosecond Microwave Pulses Based on the Cherenkov Superradiance Effect
N. S. Ginzburg, I. V. Zotova, A. S. Sergeev, R. M. Rozental', V. G. Shpak, M. I. Yalandin, A. D. R. Felps, and A. V. Cross
pp. 335-342 Full Text: PDF (144 kB)
The Effect of Metallic Screens on the Spectrum of Exchange Dipole Hybrid Electromagnetic-Spin Waves
V. E. Demidov, B. A. Kalinikos, and P. Edenhofer
pp. 343-349 Full Text: PDF (82 kB)
ELECTRON AND ION BEAMS, ACCELERATORS
Focusing of an Intense Neutralized Proton Beam
V. I. Engelko, H. Giese, V. S. Kuznetsov, G. A. Viazmenova, and S. Schalk
pp. 350-356 Full Text: PDF (121 kB)
Generation of Electron Beams in High-Aspect-Ratio Magnetron Guns with Secondary Emission Cathodes
N. I. Aizatskii, A. N. Dovbnya, V. V. Zakutin, N. G. Reshetnyak, V. P. Romas'ko, Yu. Ya. Volkolupov, and M. A. Krasnogolovets
pp. 357-360 Full Text: PDF (56 kB)
BRIEF COMMUNICATIONS
Relation between the Expansions of an External Potential in Spherical Functions and Spheroidal Harmonics
V. A. Antonov and A. S. Baranov
pp. 361-363 Full Text: PDF (37 kB)
Evolution of Short-Range, Mesoscopic, and Long-Range Orders in Magnesium–Zinc Ferrites
Z. A. Samoilenko, N. N. Ivakhnenko, V. P. Pashchenko, O. V. Kopaev, B. K. Ostafiichuk, and I. M. Gasyuk
pp. 364-367 Full Text: PDF (64 kB)
Special Features of the Structure and Properties of La0.6Sr0.2Mn1.2 – yCryO3 Magnetoresisitive Ceramics
Z. A. Samoilenko, V. P. Pashchenko, O. P. Cherenkov, and V. K. Prokopenko
pp. 368-370 Full Text: PDF (66 kB)
Impurity Diffusion in a Gas Flow in a Channel
F. G. Baksht and V. G. Ivanov
pp. 371-373 Full Text: PDF (58 kB)Archived web conten
Oral lichen planus post COVID-19 vaccination: report of two cases.
Get PDFManifestations of сoronavirus disease 2019, caused by SARS-CoV-2 virus, are
diverse and can vary from asymptomatic infection to respiratory failure needing intensive care. Vaccines against SARS‐
CoV‐2 focusing on the spike glycoprotein have shown promise in diminishing the spread of Covid‐19. Adverse effects,
however, are associated with every vaccination. Currently, there are literature reports of some cases of lichen planus
eruption following COVID-19 vaccine injection. Oral lichen planus is a relatively common immune-mediated
dermatologic disorder that can occur isolated or associated with cutaneous lichen planus. Postvaccination lichen planus
has previously been reported in the literature as a rare adverse event following various vaccinations, especially hepatitis
A and B, influenza, and varicella. The majority of patients presented with classic cutaneous lichen planus, although some
reports highlighted primarily mucosal involvement. Herein we describe two rare cases of erosive-ulcerous oral lichen
planus among SARS-CoV-2 vaccine recipients. The first is a case of a 67-year-old male who developed mucocutaneous
lichen planus 5 days after administration of the single-dose of Ad26.COV2.S COVID-19 vaccine. In the second case, a
56-year-old female presented with reactivation of oral lichen planus after receiving a first dose of Pfizer COVID-19
vaccination 2 days earlier. The mechanism of the association between vaccines and lichen planus is not known, it is
attributed to cell-mediated autoimmunity. Although there is currently no evidence of a causal relationship between SARSCoV-2 vaccination and lichen planus, these clinical observations suggest that the COVID-19 vaccine is a possible key
initiating event leading to the development or recurrence of this disease
Glaciers of the Avachinskaya volcano group: current condition (state)
Get PDFThe present-day glaciation of the Avachinskaya volcano group was analyzed using data obtained during field works of 2007–2010. Twenty seven glaciers were found on the volcanic slopes with their total area of 24.04±3.6 km2. These glaciers belong to eight morphological types, the largest part of them are glaciers of slopes, cirques, and barrancoes. Great extent, diversity of climatic conditions and volcanic edifices made possible to group the glaciers into three glacial knots (complexes): the Avachinsky complex, the Koryaksky volcano, and the Pinachevsky Range, each one with own specific features. Comparison of recent data with aerial photographs of 1974 has allowed estimating changes of the glacier front positions and to reconstruct the glacier dynamics for the last 40 years. At the present time, seven glaciers advance, two ones degrade, and eighteen glaciers are in the stationary state
Oral lichen planus post COVID-19 vaccination: report of two cases
Get PDFManifestations of сoronavirus disease 2019, caused by SARS-CoV-2 virus, are diverse and can vary from asymptomatic infection to respiratory failure needing intensive care. Vaccines against SARS‐CoV‐2 focusing on the spike glycoprotein have shown promise in diminishing the spread of Covid‐19. Adverse effects, however, are associated with every vaccination. Currently, there are literature reports of some cases of lichen planus eruption following COVID-19 vaccine injection. Oral lichen planus is a relatively common immune-mediated dermatologic disorder that can occur isolated or associated with cutaneous lichen planus. Postvaccination lichen planus has previously been reported in the literature as a rare adverse event following various vaccinations, especially hepatitis A and B, influenza, and varicella. The majority of patients presented with classic cutaneous lichen planus, although some reports highlighted primarily mucosal involvement. Herein we describe two rare cases of erosive-ulcerous oral lichen planus among SARS-CoV-2 vaccine recipients. The first is a case of a 67-year-old male who developed mucocutaneous lichen planus 5 days after administration of the single-dose of Ad26.COV2.S COVID-19 vaccine. In the second case, a 56-year-old female presented with reactivation of oral lichen planus after receiving a first dose of Pfizer COVID-19 vaccination 2 days earlier. The mechanism of the association between vaccines and lichen planus is not known, it is attributed to cell-mediated autoimmunity. Although there is currently no evidence of a causal relationship between SARS-CoV-2 vaccination and lichen planus, these clinical observations suggest that the COVID-19 vaccine is a possible key initiating event leading to the development or recurrence of this disease
Characterization of a home-built low temperature scanning probe microscopy system
Get PDFThe continuing advancement of technology is the driving force behind science and fundamental research.
Scanning probe instruments still have a major impact in nanoscience and technology, because they provide
a link between the macroscopic world and the atomic scale. The key to a reliable performance of
experiments at the nanometer scale is the instrumentation, that allows probe positioning ranging from
micrometers to Ångstroms with sub atomic precisions.
A new type of scanning probe microscopy (SPM) system operating in ultra high vacuum (UHV) and at liquid
Helium (LHe) temperature was developed. This offers the advantages that even reactive surfaces remain
clean over time periods of several days, permitting long time experiments. Moreover, these experiments
this low temperature scanning probe microscopy (LTSPM) system is the implementation of a focussing Fabry
Perot interferometer (fFPi) that allows the following features:
- Small amplitude operations and stiff cantilevers require sensors with high deflection sensitivity.
With the fFPi in this low temperature SPM system, a deflection sensitivity of 4fm/ sqrt(Hz) at 1MHz can
be obtained.
- Wide detection bandwidth (DC-10MHz) enables the operation of higher flexural oscillation modes as
well as the torsional modes of the cantilever.
- A laser spot size of 3µm allows the use of ultra small cantilevers with the dimensions 1/10 of
conventional cantilevers.
- Photothermal excitation of cantilevers avoids undesirable mechanical vibrations near the cantilever
resonance frequency.
- Simultaneous flexural and torsional force detection provides quantitative studies of frictions and
thus, atom manipulations by atomic force microscopy (AFM).
- The combination of both types of microscopes (simultaneous AFM/STM) reveals more information than a
scanning tunneling microscopy (STM) or AFM alone.
A series of measurements on Si(111)7x7, herringbone superstructure of Au(111) and highly oriented pyrolytic
graphite (HOPG) provides information regarding imaging performance of the system. Among these performance
tests are atomically resolved scans at three different operating temperatures in STM mode. In non-contact
atomic force microscopy (nc-AFM) mode, imaging was performed with the cantilever driven at the fundamental
and 2nd oscillation mode. Additional measurements were performed with the fFPi in order to quantify the
impact of the laser cooling effects (radiation pressure and photothermal effects) on the oscillating cantilever
at three different operating temperatures.
The aim of this work is the development, implementation and characterization of a new low temperature scanning
probe microscope with an ultra sensitive and high bandwidth fFPi deflection sensor, suitable for nc-AFM
operations with small, simultaneous flexural and torsional cantilever oscillation modes. Furthermore, expected
upgrades will allow simultaneous nc-AFM/STM operations.
Keywords: low temperature home-built simultaneous STM/ nc-AFM, tip-sample gap stability, PLL and self-excitation,
highly oriented pyrolytic graphite (HOPG), reconstructed Si(111)7x7, herringbone superstructure, focussing
Fabry-Perot interferometer, cantilever cooling, radiation pressure and photothermal effects.
Der kontinuierliche, technologische Fortschritt ist die treibende Kraft hinter Wissenschaft und Grundlagenforschung.
Rasterkraft und -tunnel Instrumente haben immer noch einen bedeutenden Einfluss auf die Nanotechnologie und -wissenschaft,
weil sie eine Verbindung zwischen der makroskopischen Welt und den atomaren Massstäben darstellen. Der Schlüssel für
eine zuverlässige Ausführung von Experimenten mit Nanometer Massstäben ist die Instrumentierung, die eine
Spitzenpositionierung von Mikrometer bis Ångstroms mit subatomarer Präzision erlaubt.
Ein neuartiges Rasterspitzen Mikroskop (SPM) System wurde entwickelt, das im Ultra Hoch Vakuum (UHV) und bei flüssig
Helium Temperaturen arbeitet. Dies bietet Vorteile weil sogar reaktive Oberflächen über eine Dauer von einigen Tagen
sauber bleiben, was eine längere Experimentierphase zulässt. Zusätzlich zeigen diese Experimente bei tiefen Temperaturen
weitere Vorteile wie kleine Driftwerte und tiefe Piezo Kriechraten. Der Ansatz bei diesem Tieftemperatur Rasterspitzen
Mikroskop System ist die Implementierung eines fokussierenden Fabry Perot Interferometers das die folgenden Eigenschaften
vorweist:
- Der Betrieb bei kleinen Amplituden und mit steifen Cantilever setzt Sensoren mit einer hohen Ablenkempfindlichkeit
voraus. Mit diesem fokussierenden Fabry Perot Interferometer (fFPi) kann eine Ablenkempfindlichkeit von 4fm/ sqrt(Hz)
bei 1MHz erreicht werden.
- Detektion mit einer grossen Bandbreite (DC-10MHz) erlauben einen Betrieb von Cantilever mit flexuralen und
torsionalen Oszillation Modi.
- Ein Laser mit einem Brennpunkt von 3µm lässt einen Betrieb mit einem ultra kleinen Cantilever zu, der 1/10 so gross
ist wie ein konventioneller Cantilever.
- Photothermische Anregung eines Cantilevers vermeidet unerwünschte mechanische Vibrationen rund um die Resonanzfrequenz.
- Gleichzeitige flexural und torsional Kraftdetektion erlauben quantitative Untersuchungen von Reibungen und daher
atomare Manipulationen mit Rasterkraft Mikroskopie (AFM).
- Die Kombination und simultanen Betrieb von beiden Rasterspitzen Mikroskopen (AFM/STM) zeigen mehr Information als ein
Raster Tunnel Mikroskop (STM) alleine.
Eine Serie von Messungen mit Si(111)7x7, Herringbone Superstrukturen auf Au(111) und Highly Oriented Pyrolytic Graphite (HOPG)
geben Information bezüglich der Leistungen des Systems preis. Einige dieser Leistungstests sind atomar aufgelöste Abbildungen
bei drei unterschiedlichen Betriebstemperaturen im STM Betriebsart. Im nicht-Kontakt AFM (nc-AFM) Betriebsart, Abbildungen sind
ausgeführt worden auf der Grundschwingung und der zweiten Oberschwingung. Zusätzliche Messungen wurden mit dem fFPi ausgeführt
um den Einfluss der Laserkühlung auf den oszillierenden Cantilever bei drei unterschiedlichen Betriebstemperaturen zu quantifizieren.
Das Ziel dieser Arbeit ist die Entwicklung, Implementation und Charakterisierung eines neuen Tieftemperatur Rasterspitzen Mikroskops
mit einem ultra-empfindlichen und Breitband fokussierenden Fabry Perot Interferometer Ablenk Sensor, geeignet für den nicht-Kontakt
AFM Betrieb mit kleinen, simultanen flexural und torsional Cantilever Schwingungsmodi. Naheliegende Erweiterungen des Systems
gewährleisten einen simultan nc-AFM/STM Betrieb.
Schlüsselwörter: Tieftemperatur simultan nc-AFM/STM aus Eigenbau, Spitzen-Probe Spalt Stabilität, PLL und Eigenanregungsbetrieb,
Highly Oriented Pyrolytic Graphite (HOPG), reconstrukturiertes Si(111)7x7, Herringbone Superstruktur, fokussierenden Fabry Perot
Interferometer, Cantilever Kühlung, Strahlendruck und photothermische Effekte
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