bluuebunny/crossref_metadata_2025_split huggingface dataset:
Supercapacitor with electrodes based on high-purity single-walled carbon nanotubes
Authors: Shumilin A , Gorshkov N , Fomin A , Aman A , Palis S 
Published: December 2021

Abstract
We studied a supercapacitor with high purity carbon paper electrodes [1] with a specific gravity of 20 g/m2. The specific capacitance of the electrode during assembly in a coin cell housing with an aqueous 6M KOH electrolyte, at a scan rate of 1 mV/s, is 52 F/g. The specific power is 195.42 W/kg and the specific energy is 0.19 W⋅h/kg at a scan rate of 100 mV/s, which is included in the region of supercapacitors in the Ragone plot.
Prospective directions for the development of microwave frequency standards for satellite navigation systems
Authors: Wang Ding , Davydov V V , Rud V Yu 
Published: December 2021

Abstract
The state of essential various quantum standards of GNSS frequencies for today are collected and presented, the results of analysis in the direction of modernization of time synchronization systems in global navigation satellite systems are presented. The most perspective directions of modernization of global navigation satellite systems are mentioned – the development of new atomic clocks on the mercury ions -199. The data on experimental satellite gives encouraging results.
Scanning ion-conductance microscope with modulation of the sample position along the Z-coordinate and separate Z-axial and lateral (X, Y) scanning
Authors: Zhukov M V , Lukashenko S Yu , Sapozhnikov I D , Felshtyn M L , Gorbenko O M , Golubok A O 
Published: December 2021

Abstract
Scanning ion-conductance microscope with independent piezoscanners in the lateral scanning plane XY and Z axis was designed and tested. For precise, fast and safe approach of the nanopipette to the sample surface, a coarse approach system based on a piezoinertial mover was used. Measurements of test periodic polymer structures were carried out using nanopipettes with an inner pipette diameter of about 100-150 nm. The optimal geometric parameters of the nanopipette were found and the resolution of the method was estimated. To increase the stability and reproducibility of SICM images, the Z-modulation of the position of the substrate with the sample was realized using a bimorph piezomembrane.
Determination of hole diffusion length in n-GaN
Authors: Arteev D S , Sakharov A V , Nikolaev A E , Zavarin E E , Lundin W V , Tsatsulnikov A F 
Published: December 2021

Abstract
The paper presents the derivation of a model for minority carriers collection based on the reciprocity theorem and its application for determination of hole diffusion length in n-GaN by means of photoluminescence. The estimated hole diffusion lengths at room temperature are 110 nm and 194 nm in the case of low and high excitation, respectively, which could be explained by saturation of non-radiative recombination centers in bulk GaN and at the surface with photogenerated carriers.
Internal optical loss and light-current characteristic in injection lasers
Authors: Sokolova Zinaida N , Pikhtin Nikita A , Slipchenko Sergey O , Asryan Levon V 
Published: December 2021

Abstract
Possibility of tailoring the light-current characteristic (LCC) shape in quantum dot (QD) lasers by varying uniformity of QDs is discussed. Making the QD ensemble less uniform results in roll-over in the LCC. The second branch in the LCC appears with making the QD ensemble even less uniform.
Output power of multilayered InGaAs/GaAs quantum well-dot microdisk lasers
Authors: Fominykh N A , Moiseev E I , Guseva Ju A , Maximov M V , Lihachev A I , Kryzhanovskaya N V , Zhukov A E 
Published: December 2021

Abstract
We studied the output optical power of microdisk lasers with InGaAs/GaAs quantum dots active region. An increase in the number of layers in the active region in the waveguide from 2 to 6 leads to increase in the peak output optical power due probably to increase of the gain. We also observe a corresponding increase of the threshold current due to the increase on the transparence current. The maximal optical power is achieved for structure with 6 layers at approximately 60 mA injection current. Further increase of the number of the QD layers to 10 results in increase of the threshold current and sudden drop of the output power.
Temperature stability of small-signal modulation response of WGM microlasers with InGaAs/GaAs quantum well-dots in the active region
Authors: Isaev N K , Moiseev E I , Fominykh N A , Kryzhanovskaya N V , Zubov F I , Ivanov K A , Makhov I S , Mintairov S A , Kalyuzhnyi N A , Guseva Yu A , Maximov M V , Zhukov A E 
Published: December 2021

Abstract
In this paper, results are presented on III-V quantum well dot microring diode lasers tested at elevated temperatures. To the best of our knowledge, the first uncooled microdisk lasers with diameter of 40 μm with 3-dB bandwidth above 2 GHz at 55°C are demonstrated.
Optimization of (p)a-Si:H/p-Si ohmic contact for solar cells
Authors: Kudryashov D A , Baranov A I , Uvarov A V , Morozov I A , Monastyrenko A O , Gudovskikh A S 
Published: December 2021

Abstract
In this work last results on optimization of (p)a-Si:H/p-Si ohmic contact made by PECVD method are presented. A strong effect of growth temperature and trimethylboron flow on charge carriers transport was demonstrated. An optimized (p)a-Si:H layer also was successfully applied as an emitter layer to a heterojunction solar cell fabrication where a measured open circuit voltage of 0.65 V was obtained.
A new device for autonomous space devices based on a three-component quantum variometer
Authors: Logunov S E , Davydov V V , Rud V Yu 
Published: December 2021

Abstract
The necessity of additional study of magnetic field variations in the magnetic transition layer, in the magnetopause, as well as in the plasma layer and in the tail of the magnetosphere in a wide range of distances from the Earth is substantiated. To obtain additional information in comparison with the studies that are being carried out in outer space at the present time, it is necessary to simultaneously monitor the magnetic field at various points in outer space. It is also necessary to register the dynamics of changes in the magnetic field in time in space by three components. To accomplish this task, a small-sized three-component quantum variometer with autonomous power supply has been developed for space devices, which can be lost in the course of short-term research. The results of the operation of a quantum variometer are presented.
Numerical simulation of effective light transmission through a photonic memory cell
Authors: Makarov M E , Sapegin A A , Minnullin R T 
Published: December 2021

Abstract
This paper is devoted to numerical simulation of a non-volatile photonic memory cell based on phase-change material Ge2Sb2Te5. The parameters of light propagation are presented for both crystalline and amorphous Ge2Sb2Te5 phases. The cell structure is optimized for a single TE-mode regime that is suitable for short- and long-distance communication lines.
Polarization control algorithm for QKD systems
Authors: Mekhtiev E E , Gerasin I S , Rudavin N V , Duplinsky A V , Kurochkin Y V 
Published: December 2021

Abstract
The crucial task for polarization-encoding fiber QKD is to compensate polarization drift occurring in a quantum channel. To solve this problem, the receiver usually uses a polarization controller. For proper operation, this device must be efficiently managed in real-time. In this work, a gradient-descent-based algorithm is proposed to solve this problem. The algorithm was implemented and tested on a QRate commercial QKD fiber system, that utilizes BB84-protocol. Low and stable QBER has been obtained during a day of continuous operation.
Simulation of double-junction III-phosphides/silicon solar cells
Authors: Rakitina A A , Gudovskikh A S 
Published: December 2021

Abstract
The characteristics of two-junction solar cells were calculated in this work, in which phosphides of group III are used as the top junction, and Si as the bottom junction. The following ternary phosphide compounds Ga0.52In0.48P (1.85 eV), GaPN0.02 (1.9 eV), and GaPN0.04 (1.7 eV) were considered as the active material of the top junction. The use of GaPN0.04 allowed one to reach the current matching with the bottom Si junction and an efficiency of 30% was achieved. In addition, the influence of the layer thickness, the lifetime of minority charge carriers and the electronic affinity on the efficiency of solar energy conversion were considered.
STM Light Emission and I(V) study of single gold nanoantenna
Authors: Shkoldin V A , Levedev D V , Mozharov A M , Permyakov D V , Dvoretckaia L N , Bogdanov A A , Samusev A K , Golubok A O , Mukhin I S 
Published: December 2021

Abstract
Hight-speed optical nanoemitters are of importance for on-chip optical data processing. A tunnel junctions can be a base for such light emitters, however such structures suffer from low quantum efficiency. One of the ways to improve efficiency of tunneling electron energy to photon generation conversion is the increase of the local density of optical states by using of optical nanoantennas. In this work, we study optoelectronic properties of single gold nanodisc with high spatial resolution. We show nonuniform distribution of electromagnetic near-fields of nanodisk, which is consistent with nanoantenna optical modes. And we demonstrate direct correlation between nanoantenna optical states and features on current-voltage characteristics of tunnel junction between metal tip and nanodisk.
Analysis of the limiting behavior of a biological neurons system with delay
Authors: Fedorov E G , Popov I Yu 
Published: December 2021

Abstract
In this work an analytical and numerical analysis of the limiting behaviors of a system consisting of a pair of biological neurons was carried out. In this case connection between neurons will occur with a delay. As a neuron model, the FitzHugh-Nagumo model was chosen as a model that can reproduce many dynamic behaviors of a real neuron and, at the same time, is not very complex computationally.
The effect of optogenetic activation of astrocytes on the hippocampal neurons activity
Authors: Gerasimov E I , Erofeev A I , Pushkareva S A , Bol’shakova A V , Borodinova A A , Balaban P M , Bezprozvanny I B , Vlasova O L 
Published: December 2021

Abstract
The method of optogenetics has spread widely in neurobiology over the past 10 years and has found extensive application in various fields of this sciences. It allows to control and regulate cellular activity with high spatial and temporal resolution. In this study, optogenetic activation was applied to astrocytes expressing ChR2. Optogenetic stimulation parameters were determined, in which the frequency of spontaneous currents of hippocampal pyramidal neurons significantly changed. In the future, it is planned to use the obtained data on the modes of optogenetic stimulation of astrocytes to normalize the functions of the hippocampus in mice-models of Alzheimer’s disease.
Model of ‘implant-host’ neural circuits in a microfluidic chip in vitro
Authors: Kolpakov V N , Pigareva Y I , Gladkov A A , Bukatin A S , Kazantsev V B , Mukhina I V , Pimashkin A S 
Published: December 2021

Abstract
In this study, we developed a new model of neuronal cells plating into a developed neural network to study functional integration using microfluidic methods. The integration was modeled in a three-chamber microfluidic chip by growing two weakly coupled neuronal networks and enhancing its connectivity by plating new dissociated cells. The direction of connections was formed by the asymmetric design of the chip. Such technology can be used to develop a new type of scaffold to recover the modular structure of the network.
Study of the supramolecularly ordered layered structure of chitosan gel films
Authors: Konduktorova A A , Kurochkina V A , Babicheva T S , Shmakov S L , Shipovskaya A B 
Published: December 2021

Abstract
Structural and morphological features of chitosan gel films with a radially periodic structure, obtained by neutralizing the salt form of the polymer with sodium hydroxide or triethanolamine, were visualized by scanning electron microscopy. The formation of such supramolecularly ordered layered structures was found to obey diffusion kinetics and the regularities of Liesegang periodic precipitation. The revealed dependence of the morphostructure of our chitosan gel films on the neutralizing reagent used is due to differences in the diffusion rate of inorganic and organic substance, as well as some spatio-temporal features of the mass transfer process.
Medical applications of porous silicon
Authors: Loginova E M , Shishkina D A , Zhuravleva M A 
Published: December 2021

Abstract
Materials based on porous silicon are extremely attractive for biomedical applications due to their simple and flexible production, biocompatibility, biodegradability, controlled morphology, and multiple ways of introducing the drug into the body. This paper presents the results of studies of porous structures with a broad spectrum antibiotic ceftriaxone. It has been shown that the characteristics of the porous structure change upon saturation of the pores with the drug. It was shown that solutions of porous silicon + ceftriaxone have a characteristic peak at a wavelength of 1070 nm with increasing sonication time
Influence of the nature of a polysaccharide on the surface-morphological and physicomechanical properties of sol–gel plates
Authors: Malinkina O N , Shipovskaya A B 
Published: December 2021

Abstract
Thin-film sol–gel plates based on chitosan and glucomannan polysaccharides in a wide range of compositions were obtained. The effect of the polysaccharide component on the SEM surface morphology and physicomechanical properties was evaluated. It was found that the introduction of the polysaccharide glucomannan (and/or Aloe Vera juice) into the composition of chitosan sol–gel plates increased the elastoplastic characteristics of the samples and had a significant effect on the surface relief of their solid phase. The obtained structures can be used for the design of bioadhesive sensor coatings with a high therapeutic effect, which is an urgent area for theranostics and regenerative medicine.
Application of the Kohonen neural network for monitoring tissue oxygen supply under hypoxic conditions
Authors: Mazing M S , Zaitceva A Y , Davydov R V 
Published: December 2021

Abstract
The article presents the results of application of the Kohonen artificial neural network (KANN) in assessing the oxygen status of human tissues, as well as for studying the adaptive-compensatory response of the body to functional load. In the experiment, the registered digital oxygen images of the tissue of 31 subjects were distributed into three classes using the KANN. Each group is characterised by different resistance of the organism to hypoxia. The research results have shown the effectiveness of using an artificial neural network structure and the possibility of its implementation for recognition of the functional state of a person under conditions of metabolic hypoxia; it seems relevant and has theoretical and practical significance in the framework of ecological physiology.
Thermostability of lysozyme amyloid fibrils
Authors: Melnikova N M , Sulatsky M I , Diordienko Yu D , Sulatskaya A I 
Published: December 2021

Abstract
Ordered protein aggregates, amyloid fibrils, are a marker of many serious diseases, such as Alzheimer’s, Parkinson’s, prion diseases, etc. At present, special attention is paid to the study of external influences that can affect the structure and stability of mature amyloid fibrils, which may be in demand in the development of approaches to the therapy of amyloidosis, as well as in the creation of new high-strength materials on the basis of these protein aggregates. An external factor, the influence of which on fibrils was studied in this work, was temperature denaturation. It was shown that heating lysozyme amyloid fibrils to 60 °C does not lead to their degradation, but leads only to a reversible increase in the intramolecular mobility of amyloid-forming proteins, but does not change their morphology. At the same time, boiling of lysozyme amyloids leads to their irreversible degradation, which occurs at least 5 days after exposure: fibrils that form larger clusters change their secondary structure, and fibrils with a lesser degree of clustering are divided into separate fibers. Obtained data about the factors that change the stability and structure of amyloids can be applied in biotechnology for creating new high-strength nanomaterials on their basis.
Computational modeling of schedule-specific chemotherapy outcomes in mouse tumor model
Authors: Terterov I N , Chubenko V A , Knyazev N A , Klimenko V V , Bogdanov A A , Moiseyenko V M , Bogdanov A A 
Published: December 2021

Abstract
Despite the rapid development of new innovative strategies in cancer treatment like immunotherapy, chemotherapy still remains a common choice in many cases. Standard protocols of chemotherapeutic administration rely on a maximal tolerated dose paradigm, however there is growing evidence that this approach is not always optimal. Alternative scheduling, like metronomic - low dose continuous drug administration - were recently proved their efficacy. The space of available variants of drug administration protocols is prohibitively large to be explored empirically, and there is an urgent need of predictive mathematical models for rational chemotherapeutic scheduling design. In this work we tested the ability of the minimal pharmacokinetic-pharmacodynamics model to describe schedule-specific tumor volume time evolution in different mouse tumor models.
Method development to secure the stability of the parameters of pulsed and continuous radiation in laser systems with semiconductor pumping
Authors: Abdurakhmanova S R , Bukharov G D , Gheisser Z S , Davydov V V , Rud V Yu 
Published: December 2021

Abstract
The necessity of increasing the stability of the parameters of pulsed and cw laser radiation when operating at peak powers is substantiated. Particular attention is paid to the parameters of pulsed laser radiation in systems with semiconductor pumping. The main requirement in this case is the repeatability of the parameters of the output pulses with high accuracy. This condition is ensured by the stability of the diode supply drivers, especially at peak powers, which are required for scientific research. It was found that even a short-term excess (about 1 ms) of the upper range of the permissible current leads to damage to the laser diode, which instantly degrades the parameters of laser radiation. The developed technique can significantly reduce the likelihood of these phenomena and increase the reliability of the laser.
Mn4+ concentration effect on spectral properties of lithium-germanate glass-ceramics
Authors: Babkina A N , Kovova M S , Kulpina E V , Pavliuk A S , Zyryanova K S , Monogarova A A , Bukhvostov A I , Ignatiev A I , Nuryev R K 
Published: December 2021

Abstract
A series of lithium-germanate glasses with different manganese concentration is synthesized. Li2Ge7O15 nanocrystals nucleate in the glass matrix via standard volume crystallization technique thus obtaining lithium-germanate glass-ceramics. The glass-ceramics possess intense emission near 660-670 nm under two-band excitation at 330 and 450 nm. The luminescence lifetime is 550 μs for 0.05 mol.% MnO2-doped glass-ceramics. The glass-ceramics obtained can be used as a source of deep-red radiation.
Synthesis and studying properties of the GNPs@FexOy structure
Authors: Bespalova P G , Vorobyev A A , Speshilova A B , Studzinsky V M , Patirimova E A , Karasev P A , Mishin M V 
Published: December 2021

Abstract
An article presents a study of the regularities of the formation of gold up to 8 nm thick, deposited by vacuum thermal deposition on silicon wafers with a natural oxide, its annealing and subsequent deposition of iron oxide by chemical vapor deposition. The stages were accompanied by SEM analysis of the sample surface, as well as fixation of the optical and FTIR spectra, I–V characteristics of the obtained structures.
Coherent tunable diffractional pulse shaping and generation of the 0π-pulse in Rb vapor
Authors: Bagayev S N , Averchenko V A , Chekhonin I A , Chekhonin M A , Balmaev I M , Mekhov I B 
Published: December 2021

Abstract
We have experimentally studied for the first time a new operation principle of the coherent diffractional pulse shaper (Rabi shaper). In the experiment, we observed an effect of tunable pulse shaping of nanosecond semiconductor laser pulse during the resonant pumping of the D2 line (780.24 nm) of 87Rb vapor in the range of self-diffraction angles φ = ± 4°. We observed the synthesis of nanosecond 0π-pulses at the small length of the nonlinear interaction 0.1…1 mm. We propose to use the Rabi shaper as an energy efficient tunable shaper of classical and single-photon wave packets. We analyze a possibility of the Rabi shaper operation in quantum systems with feedback.
Condition monitoring of current media using a differential refractometer
Authors: Svyatkina V I , Davydov V V , Rud V Yu 
Published: December 2021

Abstract
A new design of a differential flow refractometer has been developed to monitor the condition of flowing media in a pipeline. A new method of refractive index measurement has been implemented, taking into account the specifics of flowing and closed cuvette arrangement, as well as the angles of incidence of laser radiation on their walls. The effect of changes in the optical density in the flowing liquid on the refractive index measurement result is determined. The results of experimental investigations of different media are presented.
Characterization of In(Ga,Al)As/GaAs metamorphic heterostructures for mid-IR emitters by FTIR photoreflectance spectroscopy
Authors: Firsov D D , Chernov M Yu , Solov’ev V A , Komkov O S 
Published: December 2021

Abstract
Infrared photoreflectance (PR) spectra of In(Ga,Al)As/GaAs metamorphic heterostructures have been obtained using a novel photomodulation FTIR spectroscopy technique. An analysis of the PR spectra features allowed us to estimate the critical point energies corresponding to the direct interband transitions in various regions of the In(Ga,Al)As heterostructures, and distinguish the PR signals originating from Fabry-Perot interference. Observation of Franz-Keldysh oscillations originating from the InAlAs virtual substrate and an InGaAs waveguide layer has enabled determination of the built-in electric field intensities within the heterostructures. The obtained results open up possibilities for contactless control of free carrier concentration in In(Ga,Al)As/GaAs metamorphic heterostructures developed for growth of emitters of mid-IR spectral range.
On the need to control the state of the upper edge of the prism in a flow-through refractometer for measurements with an error less than 10−4
Authors: Isakov F A , Davydov V V , Rud V Yu 
Published: December 2021

Abstract
The article substantiates the need to use a flow-through refractometer to control the state of a flowing liquid during scientific research, when automating a technological process, etc. The main negative factors that affect an increase in the measurement error of the refractive index n of a flowing liquid are determined. It was found that one of these factors is the formation of a thin film (plaque) on the upper face of the prism, which is in contact with the medium under study. The study of the influence of this film on the measurement error has been carried out. A method has been developed to eliminate plaque from the upper face of the prism during the operation of the refractometer. The results of experimental studies are presented.