I.A. Nicolaevich, S.I. Viktorovich, G.A. Vasilyevich, Zvi Koren,
Inovemstev Alexander Nicolaevich, Stepanov Igor Viktorovich, Galkin Alexander Vasilyevich and Zvi Koren introduce full-azimuth angle domain imaging which in an onshore seismic exploration ...
Tópico(s): Hydrocarbon exploration and reservoir analysis
2013 - Wiley | First Break
Oleg Korablev, Franck Montmessin, Аlexander Trokhimovskiy, Anna Fedorova, Alexey Shakun, Аlexey Grigoriev, B. E. Moshkin, N. Ignatiev, F. Forget, Franck Lefèvre, Konstantin Anufreychik, Ilya Dzuban, Yuriy Ivanov, Y. Kalinnikov, T. O. Kozlova, Andrey Kungurov, В. С. Макаров, Fedor Martynovich, I. A. Maslov, Dmitry Merzlyakov, P. P. Moiseev, Yuri Nikolskiy, Andrey Patrakeev, D. Patsaev, Aleksandr Santos-Skripko, Oleg Sazonov, N. Semena, A. Semenov, Viktor Shashkin, A.V. Sidorov, A. V. Stepanov, Igor Stupin, Denis Timonin, A. Yu. Titov, Alexey I. Viktorov, A. V. Zharkov, F. Altieri, G. Arnold, Denis Belyaev, Jean‐Loup Bertaux, Daria Betsis, N. S. Duxbury, Thérèse Encrenaz, Thierry Fouchet, Jean‐Claude Gérard, D. Grassi, Sandrine Guerlet, P. Hartogh, Yasumasa Kasaba, I. Khatuntsev, Vladimir A. Krasnopolsky, R. O. Kuzmin, E. Lellouch, M. Á. López‐Valverde, Mikhail Luginin, Anni Määttänen, Emmanuel Marcq, Javier Martín‐Torres, Alexander S. Medvedev, Ehouarn Millour, Kevin Olsen, Manish Patel, Cathy Quantin‐Nataf, A. V. Rodin, V. I. Shematovich, Ian Thomas, N. Thomas, Luis Vázquez, M. Vincendon, V. Wilquet, Colin Wilson, L. V. Zasova, Л. М. Зеленый, María‐Paz Zorzano,
The Atmospheric Chemistry Suite (ACS) package is an element of the Russian contribution to the ESA-Roscosmos ExoMars 2016 Trace Gas Orbiter (TGO) mission. ACS consists of three separate infrared spectrometers, sharing common mechanical, electrical, and thermal interfaces. This ensemble of spectrometers has been designed and developed in response to the Trace Gas Orbiter mission objectives that specifically address the requirement of high sensitivity instruments to enable the unambiguous detection ...
Tópico(s): Calibration and Measurement Techniques
2017 - Springer Science+Business Media | Space Science Reviews
Mihir Bellare, Igors Stepanovs, Stefano Tessaro,
We show how to extract an arbitrary polynomial number of simultaneously hardcore bits from any one-way function. In the case the one-way function is injective or has polynomially-bounded pre-image size, we assume the existence of indistinguishability obfuscation (iO). In the general case, we assume the existence of differing-input obfuscation (diO), but of a form weaker than full auxiliary-input diO. Our construction for injective one-way functions extends to extract hardcore bits on multiple, correlated ...
Tópico(s): Physical Unclonable Functions (PUFs) and Hardware Security
2014 - Springer Science+Business Media | Lecture notes in computer science
Mihir Bellare, Igors Stepanovs,
We give a definitional framework for point-function obfuscation in which security is parameterized by a class of algorithms we call target generators. Existing and new notions are captured and explained as corresponding to different choices of this class. This leads to an elegant question: Is it possible to provide a generic construction, meaning one that takes an arbitrary class of target generators and returns a point-function obfuscator secure for it? We answer this in the affirmative with three ...
Tópico(s): Chaos-based Image/Signal Encryption
2015 - Springer Science+Business Media | Lecture notes in computer science
Mihir Bellare, Asha Camper Singh, Joseph Jaeger, Maya Nyayapati, Igors Stepanovs,
We aim to understand, formalize and provably achieve the goals underlying the core key-ratcheting technique of Borisov, Goldberg and Brewer, extensions of which are now used in secure messaging systems. We give syntax and security definitions for ratcheted encryption and key-exchange. We give a proven-secure protocol for ratcheted key exchange. We then show how to generically obtain ratcheted encryption from ratcheted key-exchange and standard encryption.
Tópico(s): Cryptographic Implementations and Security
2017 - Springer Science+Business Media | Lecture notes in computer science
Joseph Jaeger, Igors Stepanovs,
We aim to understand the best possible security of a (bidirectional) cryptographic channel against an adversary that may arbitrarily and repeatedly learn the secret state of either communicating party. We give a formal security definition and a proven-secure construction. This construction provides better security against state compromise than the Signal Double Ratchet Algorithm or any other known channel construction. To facilitate this we define and construct new forms of public-key encryption ...
Tópico(s): graph theory and CDMA systems
2018 - Springer Science+Business Media | Lecture notes in computer science
Mihir Bellare, Igors Stepanovs, Stefano Tessaro,
This paper addresses the fundamental question of whether or not different, exciting primitives now being considered actually exist. We show that we, unfortunately, cannot have them all. We provide results of the form $$\lnot \mathbf A \vee \lnot \mathbf B $$ , meaning one of the primitives $$\mathbf A ,\mathbf B $$ cannot exist. (But we don't know which.) Specifically, we show that: (1) VGBO (Virtual Grey Box Obfuscation) for all circuits, which has been conjectured to be achieved by candidate constructions, cannot co- ...
Tópico(s): Physical Unclonable Functions (PUFs) and Hardware Security
2015 - Springer Science+Business Media | Lecture notes in computer science
Ivan Güttler, Igor Stepanov, Čedo Branković, Grigory Nikulin, Colin Jones,
Abstract The hydrostatic regional climate model RCA, version 3 (RCA3), of the Swedish Meteorological and Hydrological Institute was used to dynamically downscale ERA-40 and the ECMWF operational analysis over a 22-yr period. Downscaling was performed at four horizontal resolutions—50, 25, 12.5, and 6.25 km—over an identical European domain. The model-simulated precipitation is evaluated against high-resolution gridded observational precipitation datasets over Switzerland and southern Norway, regions ...
Tópico(s): Cryospheric studies and observations
2015 - American Meteorological Society | Monthly Weather Review
Mihir Bellare, Igors Stepanovs, Brent Waters,
We provide the following negative results for differing-inputs obfuscation (diO): (1) If sub-exponentially secure one-way functions exist then sub-exponentially secure diO for TMs does not exist (2) If in addition sub-exponentially secure iO exists then polynomially secure diO for TMs does not exist.
Tópico(s): Advanced Steganography and Watermarking Techniques
2016 - Springer Science+Business Media | Lecture notes in computer science
V. B. Rozanov, S. Yu. Gus’kov, G. A. Vergunova, N. N. Demchenko, R. V. Stepanov, Igor Ya. Doskoch, R. A. Yakhin, N. V. Zmitrenko,
Development of direct drive target schemes for the megajoule facility is a topical problem of up-to-date inertial fusion physics. The choice of possible schemes and solutions depends essentially on the irradiation conditions. The installations both running (NIF) and under construction (LMJ) are destined to the 3ω irradiation in PDD (polar direct drive) configuration. The UFL-2M installation that is under construction is based on 2ω irradiation and a symmetrical scheme of direct drive target irradiation. ...
Tópico(s): Nuclear Physics and Applications
2016 - IOP Publishing | Journal of Physics Conference Series
Mihir Bellare, Igors Stepanovs,
At the core of Apple’s iMessage is a signcryption scheme that involves symmetric encryption of a message under a key that is derived from the message itself. This motivates us to formalize a primitive we call Encryption under Message-Derived Keys (EMDK). We prove security of the EMDK scheme underlying iMessage. We use this to prove security of the signcryption scheme itself, with respect to definitions of signcryption we give that enhance prior ones to cover issues peculiar to messaging protocols. ...
Tópico(s): Privacy-Preserving Technologies in Data
2020 - Springer Science+Business Media | Lecture notes in computer science
Shane Stegen, Igor Igorevich Stepanov, Diane L. Cookfair, Eben S. Schwartz, David Hojnacki, Bianca Weinstock‐Guttman, Ralph H. B. Benedict,
Multiple sclerosis (MS) is a disease of the central nervous system where roughly 50% of patients exhibit cognitive impairment. Episodic memory defects are particularly common in MS and the California Verbal Learning Test: 2nd Edition (CVLT-II) was recommended for assessment in MS in a recently published consensus position paper. We investigated the validity of the CVLT-II in 351 MS patients and 69 demographically matched normal controls. MS patients performed significantly more poorly on 18 of the ...
Tópico(s): Multiple Sclerosis Research Studies
2009 - Taylor & Francis | The Clinical Neuropsychologist
Igor Igorevich Stepanov, Charles I. Abramson,
A mathematical model is described based on the first order system transfer function in the form Y=B3∗exp(−B2∗(X−1))+B4∗(1−exp(−B2∗(X−1))), where X is the learning session number; Y is the quantity of errors, B2 is the learning rate, B3 is resistance to learning and B4 is ability to learn. The model is tested in a light–dark discrimination learning task in a 3-arm radial maze using Wistar and albino rats. The model provided good fits of experimental data under acquisition and reacquisition, and was ...
Tópico(s): Zebrafish Biomedical Research Applications
2008 - Elsevier BV | Journal of Mathematical Psychology
D.G. Shaysultanov, Nikita Stepanov, Sergey Malopheyev, Igor Vysotskiy, В. Н. Санин, S. Mironov, Rustam Kaibyshev, G.A. Salishchev, Sergey Zherebtsov,
Butt-joint seam of a high entropy alloy (HEA) of the CoCrFeNiMn system was successfully obtained by friction stir welding (FSW). The HEA was produced by self-propagating high-temperature synthesis. Along with the principal elements, a small amount (0.9 at.%) of C was added to the alloy. The as-cast alloy was cold rolled and annealed at 900 °C to produce refined microstructure. The structure of the annealed alloy consisted of a recrystallized face-centered cubic matrix with a grain size of 9.2 μm and ...
Tópico(s): Additive Manufacturing Materials and Processes
2018 - Elsevier BV | Materials Characterization
E. A. Stepanov, L. Peters, Igor Krivenko, A. I. Lichtenstein, M. I. Katsnelson, A. N. Rubtsov,
Correlation effects in CuO$_2$ layers give rise to a complicated landscape of collective excitations in high-T$_{\rm c}$ cuprates. Their description requires an accurate account for electronic fluctuations at a very broad energy range and remains a challenge for the theory. Particularly, there is no conventional explanation of the experimentally observed `resonant' antiferromagnetic mode, which is often considered to be a mediator of superconductivity. Here we model spin excitations of the hole-doped ...
Tópico(s): Advanced Condensed Matter Physics
2018 - Nature Portfolio | npj Quantum Materials
Yuri D. Ivanov, Tatyana O. Pleshakova, Ivan D. Shumov, Andrey F. Kozlov, Tatyana S. Romanova, Anastasia A. Valueva, Vadim Yu. Tatur, Igor N. Stepanov, Vadim S. Ziborov,
The influence of liquid motion in flow-based systems on the aggregation state of an enzyme and on its enzymatic activity was studied, with horseradish peroxidase (HRP) as an example. Our experiments were carried out in a setup modeling the flow section of the biosensor communication with a measuring cell containing a protein solution. Studies were conducted for a biosensor measuring cell located along the axis of a spiral-moving liquid flow. The aggregation state of the protein was determined with ...
Tópico(s): Microfluidic and Bio-sensing Technologies
2020 - Multidisciplinary Digital Publishing Institute | Applied Sciences
Igor Igorevich Stepanov, Charles I. Abramson, Oliver T. Wolf, Antonio Convit,
Very few attempts have been made to apply a mathematical model to the learning curve in the California Verbal Learning Test list A immediate recall. Our rationale was to find out whether modeling of the learning curve can add additional information to the standard CVLT [corrected] measures. We applied a standard transfer function in the form Y = B3*exp(-B2*(X-1))+B4*(1-exp(-B2*(X-1))), where X is the trial number; Y is the number of recalled correct words, B2 is the learning rate, B3 is readiness to ...
Tópico(s): Memory and Neural Mechanisms
2010 - Cambridge University Press | Journal of the International Neuropsychological Society
Yuri D. Ivanov, Tatyana O. Pleshakova, Ivan D. Shumov, Andrey F. Kozlov, Anastasia A. Valueva, Irina A. Ivanova, Maria O. Ershova, Dmitry I. Larionov, Victor V. Repnikov, Nina D. Ivanova, Vadim Yu. Tatur, Igor N. Stepanov, Vadim S. Ziborov,
Atomic force microscopy (AFM)-based fishing is a promising method for the detection of low-abundant proteins. This method is based on the capturing of the target proteins from the analyzed solution onto a solid substrate, with subsequent counting of the captured protein molecules on the substrate surface by AFM. Protein adsorption onto the substrate surface represents one of the key factors determining the capturing efficiency. Accordingly, studying the factors influencing the protein adsorbability ...
Tópico(s): Microfluidic and Bio-sensing Technologies
2021 - Multidisciplinary Digital Publishing Institute | Molecules
Yuri D. Ivanov, Vadim Yu. Tatur, Tatyana O. Pleshakova, Ivan D. Shumov, Andrey F. Kozlov, Anastasia A. Valueva, Irina A. Ivanova, Maria O. Ershova, Nina D. Ivanova, Victor V. Repnikov, Igor N. Stepanov, Vadim S. Ziborov,
External electromagnetic fields are known to be able to concentrate inside the construction elements of biosensors and bioreactors owing to reflection from their surface. This can lead to changes in the structure of biopolymers (such as proteins), incubated inside these elements, thus influencing their functional properties. Our present study concerned the revelation of the effect of spherical elements, commonly employed in biosensors and bioreactors, on the physicochemical properties of proteins ...
Tópico(s): bioluminescence and chemiluminescence research
2021 - Multidisciplinary Digital Publishing Institute | Polymers
Yuri D. Ivanov, Tatyana O. Pleshakova, Ivan D. Shumov, Andrey F. Kozlov, Irina A. Ivanova, Anastasia A. Valueva, Maria O. Ershova, Vadim Yu. Tatur, Igor N. Stepanov, Victor V. Repnikov, Vadim S. Ziborov,
Abstract In our present paper, the influence of a pyramidal structure on physicochemical properties of a protein in buffer solution has been studied. The pyramidal structure employed herein was similar to those produced industrially for anechoic chambers. Pyramidal structures are also used as elements of biosensors. Herein, horseradish peroxidase (HRP) enzyme was used as a model protein. HRP macromolecules were adsorbed from their solution onto an atomically smooth mica substrate, and then visualized ...
Tópico(s): Microfluidic and Capillary Electrophoresis Applications
2021 - Nature Portfolio | Scientific Reports
Lisa De Stefano, Igor Igorevich Stepanov, Charles I. Abramson,
This paper describes a mathematical model of the learning process suitable for studies of conditioning using the proboscis extension reflex (PER) in honey bees when bees are exposed to agrochemicals. Although procedural variations exist in the way laboratories use the PER paradigm, proboscis conditioning is widely used to investigate the influence of pesticides and repellents on honey bee learning. Despite the availability of several mathematical models of the learning process, no attempts have been ...
Tópico(s): Insect and Arachnid Ecology and Behavior
2014 - Multidisciplinary Digital Publishing Institute | Insects
Т.С. Калебина, GalinaN. Rudenskaya, Irina Selyakh, OlgaM. Khodova, GalinaG. Chestukhina, ValentinM. Stepanov, IgorS. Kulaev,
Tópico(s): Protein Hydrolysis and Bioactive Peptides
1988 - Springer Science+Business Media | Applied Microbiology and Biotechnology
Evgeniy V. Sadyrin, Roman V. Karotkiyan, Н. И. Сушенцов, S. A. Stepanov, Igor Yu. Zabiyaka, Evgeniy A. Kislyakov, Александр Литвиненко,
The chapter presents a comprehensive analysis of the nanoindentationNanoindentation derived mechanical characteristics (elastic modulus and indentation hardness) of the TiN coatingCoating deposited using the method combining magnetron sputtering and arc evaporation on a steel substrate. For the nanoindentationNanoindentation experiments, spherical indenter was used. The results of studies of microstructureMicrostructure, chemical composition, and also measurements of the coatingCoating thickness ...
Tópico(s): Advanced Surface Polishing Techniques
2020 - Springer Nature | Springer Proceedings in Materials
Iumzhana A. Bolotova, Alexander O. Ustyuzhanin, Ekaterina S. Sergeeva, Anna A. Faizdrakhmanova, Haitao Yu, Andrey V. Stepanov, Igor А. Ushakov, Konstantin А. Lyssenko, Lei You, Andrey G. Lvov,
There is incessant interest in the transfer of common chemical processes from organic solvents to water, which is vital for the development of bioinspired and green chemical technologies. Diarylethenes feature a rich photochemistry, including both irreversible and reversible reactions that are in demand in organic synthesis, materials chemistry, and photopharmacology. Herein, we introduce the first versatile class of diarylethenes, namely, potassium 2,3-diarylmaleates (DAMs), that show excellent ...
Tópico(s): Sulfur-Based Synthesis Techniques
2023 - Royal Society of Chemistry | Chemical Science
Irina Stepanov, Stephen S. Hecht, Gheorghe Duca, Igor Mardari,
Abstract The evidence of an association between childhood exposure to environmental tobacco smoke (ETS) and an increased risk of lung cancer is inconsistent. However, taking into account the existing association between lung cancer and adulthood ETS exposure, it is plausible that children exposed to ETS also would be at risk of developing lung cancer later in life. In this study, we investigated the uptake by Moldovan children of the tobacco-specific lung carcinogen 4-(methylnitrosamino)-1-(3-pyridyl)- ...
Tópico(s): Glutathione Transferases and Polymorphisms
2006 - American Association for Cancer Research | Cancer Epidemiology Biomarkers & Prevention
A.D. Stepanov, E.P. Gilson, L. Grisham, Igor Kaganovich, Ronald C. Davidson,
Ferroelectric Plasma Sources (FEPSs) can generate plasma that provides effective space-charge neutralization of intense high-perveance ion beams, as has been demonstrated on the Neutralized Drift Compression Experiment NDCX-I and NDCX-II. This article presents experimental results on charge neutralization of a high-perveance 38 keV Ar+ beam by a plasma produced in a FEPS discharge. By comparing the measured beam radius with the envelope model for space-charge expansion, it is shown that a charge ...
Tópico(s): Metal and Thin Film Mechanics
2016 - American Institute of Physics | Physics of Plasmas
Igor Igorevich Stepanov, Charles I. Abramson, Seth Warschausky,
A mathematical model is proposed to measure the learning curve in the California Verbal Learning Test-Children's Version. The model is based on the first-order system transfer function in the form Y = B3*exp[-B2*(X-1)]+B4*{1-exp[-B2*(X-1)]}, where X is the trial number, Y is the number of recalled correct words, B2 is the learning rate, B3 is interpreted as readiness to learn and B4 as the ability to learn. Children's readiness to learn and ability to learn were lower than adults. Modeling revealed ...
Tópico(s): Reading and Literacy Development
2011 - Taylor & Francis | Child Neuropsychology
Vladimir A. Nadolinny, O. P. Yuryeva, V. S. Shatsky, Aleksandr S. Stepanov, V. V. Golushko, Marianna I. Rakhmanova, Igor N. Kupriyanov, А. А. Калинин, Yuri N. Palyanov, D. A. Zedgenizov,
Tópico(s): Ion-surface interactions and analysis
2009 - Springer Science+Business Media | Applied Magnetic Resonance
S. B. Bodrov, A. N. Stepanov, М. И. Бакунов, B. V. Shishkin, Igor Ilyakov, Р. А. Ахмеджанов,
We demonstrate experimentally the efficiency of a recently proposed scheme of terahertz generation based on Cherenkov emission from ultrashort laser pulses in a sandwich structure. The structure has a thin nonlinear core covered with a prism of low terahertz absorption. Using an 8 mm long Si-LiNbO(3)-BK7 structure with a 50 microm thick LiNbO(3) core, we converted 40 microJ, 50 fs Ti:sapphire laser pulses into terahertz pulses of approximately 3 THz bandwidth with a record efficiency of over 0.1%.
Tópico(s): Photonic and Optical Devices
2009 - Optica Publishing Group | Optics Express
Vladimir A. Nadolinny, V. S. Shatsky, O. A. Kozmenko, Aleksandr S. Stepanov, Y.u.N. Palyanov, Igor N. Kupriyanov,
Tópico(s): Advanced Materials Characterization Techniques
2006 - Elsevier BV | European Journal of Mineralogy