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Search Results: 1 - 10 of 1010 matches for " Nikolay Shuvalov "
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On the Ionization Energy of the Outer Electrons of Atoms and Their Ions  [PDF]
Nikolay D. Gudkov, Vladimir A. Shuvalov
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.411178

An empirical formula is proposed to calculate the total binding energy of the outer electrons of atoms and their ions to a high accuracy. It is the authors’ opinion that the validity of the proposed formula testifies that electronic shells have some “spatial structures”, and the nature of which depends neither on the nucleus charge, nor on the number of the electrons in a shell.

Evaluation of CDK6 and p16/INK4a-Derived Peptides Interaction  [PDF]
Andrey Kazennov, Andrey Alekseenko, Vladimir Bozhenko, Tatiana Kulinich, Nikolay Shuvalov, Yaroslav Kholodov
Computational Molecular Bioscience (CMB) , 2013, DOI: 10.4236/cmb.2013.33007
Abstract:  The goal of this work is the development of novel peptides with high efficacy of inhibiting activity of CDK6/CyclinD complex. The peptides were derived from primary sequence of P16 protein and its homologues. The interactions between CDK6 and P16/INK4a-derived peptides are studied with molecular dynamics simulation employing umbrella sampling method. The SASA implicit solvent model was used for simulation, which was accelerated using NVIDIA GPUs.
Incoherent Oscillations Accompanying Charge Separation in Photosynthetic Reaction Centers  [PDF]
A. G. Yakovlev, V. A. Shuvalov
Open Journal of Applied Sciences (OJAppS) , 2013, DOI: 10.4236/ojapps.2013.33B001

Early events of charge separation in reaction centers (RCs) of bacterial photosynthesis are modeled by kinetic equations with time-dependent rate constants. An illustrative case of regular motion along a “slow” coordinates leading to oscillations in the kinetics is examined. Different schemes of charge separation are investigated. A good fitting of experimental kinetics of native Rba. sphaeroides RCs is achieved in the five states model P*1BAHA↔P*2BAHAI↔P+HA↔P+BA with two excited states BAHA and BAHA and three charge separated states I, P+HA and P+BA (P is a primary electron donor, bacteriochlorophyll dimer, BA and HA are an electron acceptor, monomeric bacteriochlorophyll and bacteriopheophytin in active A-branch, respectively). In the model only the first excited state is directly populated by optical excitation. The emission of the two excited states is assumed to be at 905 and 940 nm, respectively. The intermediate state I is assumed to absorb at 1020 nm as well as the P+HA state. The model explains the deep oscillations in the kinetics of the stimulated emission and of the absorption. In the simpler schemes without the I state or with only one excited state the accordance with the experiment is achieved at unreal parameter values. A possible nature of the I and BAHA states and a possible incoherent nature of the oscillations are discussed.

Structures, Fields and Methods of Identification of Nonlinear Static Systems in the Conditions of Uncertainty  [PDF]
Nikolay Karabutov
Intelligent Control and Automation (ICA) , 2010, DOI: 10.4236/ica.2010.12007
Abstract: The field of structures on set of secants is offered and methods of its construction for various classes of one-valued nonlinearities of static systems are considered. The analysis of structural properties of system is fulfilled on specially generated set of data. Representation on which modification it is possible to judge to nonlinear structure of static systems is introduced. It is shown, that structures of nonlinear static systems have a special V-point. The adaptive algorithm of an estimation of structure of nonlinearity on a class poly-nomial function is offered.
User Interface for People with Autism Spectrum Disorders  [PDF]
Nikolay Pavlov
Journal of Software Engineering and Applications (JSEA) , 2014, DOI: 10.4236/jsea.2014.72014

This paper describes the requirements for building accessible user interface for users with autism spectrum disorders (ASD) and presents the user interface (UI) of Open Book, a reading assistive tool for people with ASD. The requirements are extracted from both existing research on improving reading comprehension for people with ASD, and from the feedback of users and clinical professionals. The findings are applied in practice to create the user interface of Open Book tool. Key screens of the user interface are presented. It is implied that the features of the UI for people with ASD can be successfully applied to improving overall accessibility of any graphical user interface.

Bilaterally Symmetrical Transformation between Independent Operators and Rotations  [PDF]
Nikolay Raychev
Journal of Quantum Information Science (JQIS) , 2015, DOI: 10.4236/jqis.2015.53010
Abstract: This report describes an approach for representation of quantum operators through rotations and rotation through quantum operators. The approach of the proposed method transforms rotation in a kind of a unitary matrix that corresponds to the rotation. Operations with qubits are very similar to the rotation, but with an added phase coefficient. This fact is used to create a process for rotation between unitary matrices. This approach could be used to modifying the controls to apply in a different basis.
Formalized Operators with Phase Encoding  [PDF]
Nikolay Raychev
Journal of Quantum Information Science (JQIS) , 2015, DOI: 10.4236/jqis.2015.53014
Abstract: In this article the concept of phase encoding/decoding is used to analyze and formalize a simple quantum algorithm—the Deutsch’s algorithm. The algorithm is formalized in two different ways through an analysis, based on phase encoding/decoding, carried out by the formalized elementary operators developed by the author of this article. Concrete examples of different possible realizations of the formalized with Raychev’s operators Deutsch’s algorithms are offered.
Formalized Quantum Model for Solving the Eigenfunctions  [PDF]
Nikolay Raychev
Journal of Quantum Information Science (JQIS) , 2016, DOI: 10.4236/jqis.2016.61003
Abstract: This report describes a fundamental model of a quantum circuit for finding complex eigenvalues of Hamiltonian matrices on the quantum computers through the use of an iteration algorithm for estimation of the phase. In addition to this, we demonstrate the use of the model for simulating the resonant states for quantum systems.
Interactive Quantum Development Environment (IQDE)  [PDF]
Nikolay Raychev
Journal of Quantum Information Science (JQIS) , 2016, DOI: 10.4236/jqis.2016.62010
Abstract: This report presents a second version of the Interactive Quantum Development Environment (IQDE), virtualized parallel simulation platform for optimized testing of quantum software. IQDE is an interactive quantum simulator intended for implementation of a classical computer that can simulate numerous controlled and time-dependent operations. The research presents different relations between the operations that can be typically simulated. The virtualized simulation platform carries out numerous single-node and multi-node optimizations, including vectorization, parallelization, cache sharing, as well as overlapping of the computations with the communication. A common strategy for modeling for shared memory is implemented, as well as realistic parallel simulation with cluster management of the parallelization. А detailed analysis of the implementation is performed in order to be demonstrated that the simulator achieves good operation and high efficiency of the hardware, which is only limited by the available memory and the bandwidth of the machine.
Fundamental Limit for Universal Entanglement Detection  [PDF]
Nikolay Raychev
Journal of Applied Mathematics and Physics (JAMP) , 2016, DOI: 10.4236/jamp.2016.48166
Abstract: The entanglement, one of the central mysteries of the quantum mechanics, plays a significant role in a variety of applications of the quantum information theory. A natural question in theoretical and experimental importance is whether it is possible to detect a universal entanglement without full diagnostics. The diagnostics relies on a set of quantum trajectories and their records from measurements. This model reflects the probability that each of the measurements may be damaged from interference and decoherence, and may also be associated with recording of continuous signals for an end-time period. The goal is then to retrieve the quantum state such as it had been in the beginning of this measurement process. The proposed solution relies on explicit expression of the probability function through effective matrices contained in the quantum approximation and solutions of ad-joint quantum filters. In this article, we prove а no-go theorem, which outlines this possibility for non-adaptive schemes, which use only single-copy measurements. We also examine in detail а previously conducted experiment, for which it is claimed that detects the entanglement of two-qubit states through adaptive single-copy measurements without full diagnostics. With the conduct of the experiment and the analysis of the data, we demonstrate that the information collected is really sufficient to reconstruct the state. These results reveal a fundamental limit of the single-copy measurements upon the entanglement detection, and provide a common framework for learning the detection of other interesting properties of the quantum states, such as the positivity of partial transposition and the k-symmetric-extendibility.
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