bluuebunny/crossref_metadata_2025_split huggingface dataset:
Resistive switching phenomena in thin ferroelectric films
Authors: Andreeva N V , Petraru A , Petukhov A E , Batueva A V 
Published: December 2019

Abstract
Switching of the resistance in thin ferroelectric films is a complex phenomenon involving an influence of polarization states, point defects, processes of electron injection from electrodes and peculiarity of polarization charges screening. In order to clarify the mechanism of surface charge screening under ferroelectric polarization switching and its correlation with the local resistive properties in thin ferroelectric films, we studied the changes in the surface potential under dc bias voltage application in SrTiO3/La0.7Sr0.3MnO3/BaTiO3 heterostructures using different modes of atomic force microscopy (Kelvin probe, piezoresponse, and conductive) at ambient conditions. It is found that the peculiarity of surface charge screening under polarization reversal gives a strong electrostatic contribution in the measurements of local resistive properties at the ambient conditions and could completely veil the real current distribution over the film surface. Remarkably, scanning tunnelling microscopy measurements under ultra-high vacuum conditions show evidence of oxygen vacancy formation in thin ferroelectric films after poling, revealing an increase of the film thickness due to the chemical expansion.
Dielectric characterization of erythrocytes by electrostatic force microscopy
Authors: Davletkildeev N A , Sokolov D V , Yu Mosur E , Lopandina A A 
Published: December 2019

Abstract
The method of determination of the dielectric constant of individual erythrocytes, based on a quantitative analysis of the profiles of their images obtained by electrostatic force microscopy, is presented. A model of electrostatic interaction between the atomic force microscope probe and the biological cell is proposed. The obtained values of the permittivity of individual erythrocytes agree well with known literature data.
Microscopic studies of disordered carbon-rich inclusions in ultra-high pressure glasses from impactites of the Kara astrobleme
Authors: Golubev Ye A , Shumilova T G , Isaenko S I , Utkin A A 
Published: December 2019

Abstract
The paper presents the results of study of the carbon-containing phase discovered in the impact glass of the Kara astrobleme. We used the following research methods: optical, scanning electron, and atomic force microscopies, as well as Raman spectroscopy. This phase represents carbon-containing inclusions up to several tens of micrometres in size with an amorphous diamond-like structure. At the nanoscale, the studied phase is characterized mainly by a homogeneous structure.
Charged domain walls in lithium tantalate with compositional gradients produced by partial VTE process
Authors: Greshnyakov E D , Lisjikh B I , Pryakhina V I , Nebogatikov M S , Shur V Ya 
Published: December 2019

Abstract
The morphology of a single charged domain wall, appeared under the action of composition gradients produced by partial VTE procedure by Cherenkov-type second harmonic generation microscopy, was observed in detail. The width of the charged domain wall was estimated as 70 μm. Non-through and through narrow domains, grown from the charged domain wall, were revealed. The maximum length of non-through domains with submicron diameter was about 100 μm. The growth of narrow domains from the charged domain wall was demonstrated and attributed to the action of pyroelectric field. The widening of domains occurred after achieving the polar surface.
Styrene-terminated polyphenylene oxide and polybutadiene low dielectric reactive blend
Authors: Hu W , Shen J , Zhou J , Jin W , Chen W 
Published: December 2019

AbstractStyrene-terminated polyphenylene oxide (SPPO) and low polar thermosetting polybutadiene (PB) resin were employed to obtain a curing system with excellent electrical properties and enhanced thermal properties. By terminal styrenisation, SPPO is cured with PB, forming a continuous phase in the blend. The SPPO/PB blends have excellent solvent resistance and thermal stability, while the good dielectric performance is retained. Especially, when the mass ratio of PB is 0.5, the curing system has a highTgof 226.5°C and excellent dielectric properties with Dk = 2.46 and Df = 0.0022 at 10 GHz, which is suitable for high frequency electrical applications.
Development and research carbon nanotube-based resistive gas sensor
Authors: Il’in O I , Il’ina M V , Rudyk N N , Guryanov A V , Fedotov A A 
Published: December 2019

Abstract
Experimental studies of the processes of formation of catalytic centres (CC) and carbon nanotubes (CNTs) at ITO contacts have been carried out. The regularities of the influence of the annealing temperature on the geometric dimensions of CC have been established. An array of interwoven CNTs with a highly developed surface has been grown. A model of a gas sensor with a sensitive element based on a CNT network has been created. The reaction time and reaction of the sensor, its sensitivity to N2, O2, and Ar have been experimentally investigated. It has been shown that the sensor has a maximum sensitivity of 17.2% to N2, 16.3% to Ar, and 18.7% to O2 in the range of gas concentrations from 30 to 70 ppm. It has been shown that gas detection is possible at room temperature, despite a rather long reaction and reduction time. In this case, an almost complete restoration of the sensitive element of the initial resistance has occurred without additional heating.
Evaluation of mechanical and electrical parameters of individual polyaniline nanoparticles
Authors: Lobov I A , Davletkildeev N A , Sokolov D V , Mosur E Yu 
Published: December 2019

Abstract
The work function, the static dielectric constant, and the elastic modulus of individual polyaniline nanoparticles in the base form deposited on HOPG were determined. Electrostatic force microscopy was used to determine the electrical parameters. The value of the work function is 4.66 eV. The dielectric constant is 2.2. Contact atomic force microscopy was used to determine Young’s modulus. The modulus of elasticity is 4.42 GPa. The obtained values differ from the typical values obtained on bulk samples of the base form polyaniline. In the case of electrical parameters, this is due to contact phenomena between the conductive substrate and the dielectric nanoparticle. The Young’s modulus of a polyaniline nanoparticle depends on the packing density of the macromolecule, while the Young’s modulus of a compressed tablet depends mainly on the intermolecular forces.
Structural, electronic, and magnetic properties of ferroelectric/dielectric heterostructures
Authors: Lysogorskii Yu V , Piyanzina I I , Pavlov D P , Leontyev A V , Mamin R F , Tayurskii D A , Kabanov V V 
Published: December 2019

Abstract
We present the results of structural, electronic, and magnetic properties of BaTiO3/LaMnO3 heterostructure by means of first-principles calculations. We demonstrate the possibility of highly conducting layer formation at the heterostructure composed of perovskite ferroelectric BaTiO3 and antiferromagnet manganite LaMnO3. We also analyse magnetic properties and an impact of ferroelectric polarization onto the conducting properties. Experimental results of magnetic field effect on Ba0.8Sr0.2TiO3/LaMnO3 heterostructure are presented as well. Effect of illumination of the Ba0.8Sr0.2TiO3/LaMnO3 heterostructure is also demonstrated.
The modification of PETF-membranes by Langmuir-Blodgett films of Nafion
Authors: Melnikova G B , Ledvig O G , Chizhik S A , Kozlovskiy A L , Zdorovec M V 
Published: December 2019

Abstract
In this research, the surfaces of track PETF-membranes were modified by Langmuir-Blodgett (LB) films of Nafion. The changes of structure of modified membranes were studied by atomic force microscopy (AFM). The LB-film of Nafion monolayer was found to be 30-100 nm thick. The incorporation of SiO2 nanoparticles in LB-layer in small quantities was structuring the monolayer. The performance of water of PET-200 membranes with a Nafion film was increased to 401.3 ml/(m2·h) from the initial values of 342.1 ml/(m2·h). The air performance was increased for all modified PETF-200 membranes. The maximum performance was achieved by modifying the membranes with pure Nafion; the productivity was 154.3 ml/min compared with 96.4 ml/min for the initial membrane. It was shown that LB-films were stable during monitoring filtration characteristics.
Light polarization and intensity behaviour in aperture cantilevers with carbon tip created by focused ion beam
Authors: Mikhailova T V , Vysokikh Yu E , Krasnoborodko S Yu , Kolomiytsev A S , Fedotov A A 
Published: December 2019

Abstract
Modern atomic force microscopy (AFM) techniques and their combination with other methods give us a possibility to investigate the same samples from the new side at nano-scale. One of very promising combinations is polarization near field microscopy integrated into AFM tool. It allows one to make topography imaging by standard AFM tool and optical magnetic structure imaging by magneto-optical method simultaneously. Moreover, this combination gives synergy effect on both methods by improving their weak sides: elimination of magnetic influence of magnetic force microscopy on the sample, on the one hand, and overcoming the diffraction limit of the magneto-optical microscopy, on another hand. The cantilevers play a very important role in this combination of the methods since they interact with the surface and allow focusing the laser beam to the sample in near field mode. The geometry and other parameters of cantilevers are determined as a result of the combined methods implementation. Authors investigate the new type of carbon-tips aperture cantilevers for AFM and high resolution magneto-optical combination.
Experimental assessments of metallic and metal oxide nanoparticles’ toxicity
Authors: Privalova L I , Sutunkova M P , Minigaliyeva I A , Klinova S V , Ryabova Iu V , Solovyova S N , Bushueva T V , Fröhlich E , Shur V Ya , Zubarev I V , Makeyev O H , Valamina I E , Panov V G , Shishkina E V , Gurvich V B , Katsnelson B A 
Published: December 2019

Abstract
Nanoparticles of metals and their oxides (Me-NPs) are of special interest in the light of health risks assessment and management, because, along with engineered Me-NPs, there exists usually a substantial fraction of nanoscale (“ultrafine”) particles of the same substances within the particle size distribution of condensation aerosols generated by arc-welding, metallurgical, and some chemical technologies. The nonspecific responses of the organism to the impact of Me-NP included: changes in the cytological and some biochemical characteristics of the bronchoalveolar lavage fluid caused by the deposition of particles in the lower airways, various manifestations of systemic toxicity including significant damage to the liver and kidneys, moderate neurological disturbances associated with possible penetration of Me-NP into the brain from the blood as well as from the nasal mucous membrane along the olfactory pathway, a paradoxically low manifestation of pulmonary pathology due to low chronic retention of nanoparticles in the lungs, and a genotoxic effect on the organism level. The toxicity and even genotoxicity of Me-NPs can be significantly attenuated by adequately composed combinations of some bioactive agents in innocuous doses.
Novel technology for fabrication of probe tips for SPM using focused ion beam-induced deposition method
Authors: Shandyba N A , Kolomiytsev A S , Panchenko I V , Lisitsyn S A 
Published: December 2019

Abstract
The results of an experimental study of the fabrication of high aspect probe tips for atomic force microscopy (AFM) and critical dimension AFM (CD AFM) using the focused ion beam (FIB) milling and ion beam induced deposition of carbon are presented. It is shown that the probes formed by the FIB method have a higher resolution of surface scanning and allow studying nanoscale structures without distortion. In this work, a technique for the formation of AFM probes based on the use of a combination of ion-beam milling and ion-induced carbon deposition was developed. Based on the developed technique, high aspect probe with about 8 μm high, with a tip radius of about 40 nm and an aspect ratio of 30:1, were fabricated. A probe for CD AFM was also formed using FIB-induced deposition of carbon with about 320 nm of flare. The results obtained in the study can be used in the development of technological processes for the manufacturing and modification of special probes for AFM, including probes CD-AFM. The paper shows the possibility of forming the tip of the probes for specialized tasks of nanodiagnostics and nanometrology. The proposed technology allows reducing the artefacts of scanning probe microscopy and improving the adequacy of the results of AFM studies.
Features of Raman spectra in barium titanate pressed powder
Authors: Zaytseva I V , Pugachev A M , Surovtsev N V , Krylov A S 
Published: December 2019

Abstract
Raman spectra in barium titanate powder under non-hydrostatic pressures are presented. The relationship between the pressure (up to 11 GPa) and the shift and the width of E(TO)-phonon line has been established. It has been found that under the action of uniaxial pressure a new Raman peak arises in the vicinity of 100 cm−1. It is shown that the Raman shift and width of both peaks increase depending on the applied pressure. These Raman lines broadening may be associated with an increase of the concentration of defect states in the volume of the sample.
Modelling uranyl-ions sorption by nanostructured composite anatase-based materials
Authors: Sokolnitskaya T A , Zheleznov V V , Golikov A P , Plakhutina A E 
Published: December 2019

Abstract
Influence of complex formation in solution on U sorption has been studied for mesoporous nanostructured anatase-based composites. Uranium sorption degree has been shown to correlate with the stability of the complexes in solution. A model for uranium sorption by titania materials has been suggested presuming two-stage sorption mechanism. It is assumed that initial binding of neutral and positively charged uranyl complexes to negatively charged hydroxyl groups occurs on the first stage, while decomposition of complex ion proceeds on the second stage with the UO2 being fixed on sorption sites. Prevailing uranium species in solution and kinetics of their ratios have been determined. Calculated rates of evolution of uranyl ion species distribution (therefore, rate and efficiency of the sorption) correlate well with complex stability in solution.
Simulation of femtosecond pulse in a Kerr-lens mode locked Ti: sapphire laser
Authors: Nomin-Erdene E , Unurbileg D , Munkhbaatar P , Baatarchuluun Ts , Khos-Ochir Ts , Munkhbayar G , Tuvjargal N , Erdene-Ochir G , Davaasambuu J 
Published: December 2019

Abstract
The Kerr-lens mode-locking (KLM) is known as a suitable method for generation of femtosecond pulses and mode-locked Ti:sapphire laser is now widely used sources of stable, energetic femtosecond pulses. We will present the simulation of KLM in Ti:sapphire laser cavities with a folded-cavity four-mirror by applying the ABCD ray-tracing technique for a Gaussian beam. Simulations will be performed for an asymmetric resonator design. Based on the numerical analysis, we will find the optimum design parameters (slit position, gain cavity spacing, gain medium position) for KLM.
Nanostructured composite materials based on titanium dioxide doped by Mn: template zol-gel synthesis, structure, properties
Authors: Zheleznov V V , Ustinov A Yu , Tkachenko I A , Kvach A A , Kaidalova T A , Podgorbunsky A B 
Published: December 2019

Abstract
Nanostructured composites based on TiO2 doped with Mn were obtained by sol-gel template method. The morphology and structure of the composites were studied by x-ray diffraction, scanning and transmission microscopy, X-ray photoelectron spectroscopy. Electrical conductivity and magnetic properties are investigated. It is shown that the doping of TiO2 samples with manganese improves conductivity by two orders of magnitude in comparison with a non-doped sample. Changing the annealing conditions of the nanostructured composite increases the conductive properties four times. It is established that the studied samples have ferromagnetic ordering at room temperature, and the saturation magnetization value and the slope angle of the curve M(H) depend on the annealing conditions, the presence of a magnetic transition in the region of 45 K corresponding to the transition Mn3O4 to the ferrimagnetic state is determined.
Synthesis of highly dispersed precursor nanopowders for YAG:Yb ceramics by the use of hexamethylenetetramine
Authors: Chikulina I S , Kravtcov A A , Nikova M S , Malyavin F F , Lapin V A , Kuleshov D S 
Published: December 2019

Abstract
The effect of hexamethylenetetramine on the morphology, dispersion composition and chemical homogeneity of the YAG:Yb ceramic nanopowders, obtained by the method of heterophase co-precipitation, followed by calcination (1100 °C) was studied. It was shown that the use of an aqueous hexamethylenetetramine solution allows obtaining YAG:Yb nanopowders with the particles size of 40-70 nm with a degree of agglomeration of 2.54, which is significantly less than that in comparison with the powders, obtained by precipitation in ammonia.
Acoustic Method of Division of Ultradispersible Powders
Authors: Darmaev T G , Kalashnikov S V , Nomoev A V 
Published: December 2019

Abstract
It is known that nanodispersible powders are the condensed medium which at the same time have properties of liquid and solid bodies. And properties of such an environment strongly depend on particle size. In this work, the acoustic method of division of ultradispersible powders on the fluctuating plate is considered. The experimental data by the efficiency of the division of nanoparticles of dioxide of silicon are obtained. Based on a method of successive approximations of the Navier-Stokes equations for vorticity the equations and boundary conditions for the fluctuating plates taking into account amplitude to the second- order are received. Using the Mathematica system, analytical decisions are received and plots of vectors fields of speeds for a plate of the infinite length are constructed.
Composite nanoparticles: applications, creation mechanism, properties
Authors: Nomoev A V , Syzrantsev V V , Yumozhapova N V , Khartaeva E Ch , Torkhov N A , Zobov K V 
Published: December 2019

Abstract
Annotation This article presents data on the use of Janus-like and core-shell composite nanoparticles consisting of two substances—metal and semiconductor—in nanophotonics and spectroscopy. Investigations were carried out of the mechanism of formation of composite nanoparticles, based on the principle of minimum surface energy of the system and the results of molecular dynamics modelling. Integral representation was employed to analyse size distribution function of nanoparticles, and it was concluded that coagulation predominates during particle formation.
Research of silicon and silver nanoparticles obtained by laser ablation in liquid
Authors: Gyrylov E I 
Published: December 2019

Abstract
Laser ablations of silicon and silver in ethanol were made and the nanoparticles obtained were studied. It was shown the silver nanoparticles had both monocrystal and polycrystalline structures and cubic and hexagonal structures. It was cleared the amorphous silicon nanoparticles included a little quantity of the monocrystalline silicon nanoparticles.
Effects of Acculturation on the Cross-Cultural Neuropsychological Test Battery (CNTB) in a Culturally and Linguistically Diverse Population in Denmark
Authors: Al-Jawahiri Fatima , Nielsen T Rune 
Published: December 2019

Abstract

Objective
Assessment of individuals from diverse ethnic backgrounds is a major challenge in current clinical neuropsychology as most neuropsychological tests are biased by linguistic, educational, and cultural differences. The aim of this study was to examine the effects of acculturation on the newly developed European Cross-Cultural Neuropsychological Test Battery.

Method
The study was a cross-sectional study carried out in Copenhagen, Denmark. Neuropsychological test performances of a Danish sample were compared to a culturally and linguistically diverse sample, and the effects of a number of acculturation variables were assessed using group comparisons, correlation analyses, and regression analyses.

Results
A total of 152 participants were included in the study: 26 were native-born monolingual Danes and 126 had culturally and linguistically diverse backgrounds: 66 were immigrants from Turkey, 41 from Poland, and 19 from former Yugoslavia. In direct comparison, the only significant difference between the Danish and culturally and linguistically diverse samples was found on Animal Fluency. However, within the culturally and linguistically diverse sample, higher and lower acculturated groups significantly differed on several measures. The main associations between neuropsychological test performance and acculturation variables were found on measures loading on processing speed and executive function.

Conclusions
Overall, only limited effects of acculturation were found on the European Cross-Cultural Neuropsychological Test Battery. However, administering cross-cultural measures in the preferred language may not be sufficient to resolve challenges in cross-cultural assessment of processing speed and executive function as concept of speed and speeded performance is highly culture dependent.
scTIM: seeking cell-type-indicative marker from single cell RNA-seq data by consensus optimization
Authors: Feng Zhanying , Ren Xianwen , Fang Yuan , Yin Yining , Huang Chutian , Zhao Yimin , Wang Yong 
Published: December 2019

Abstract

Motivation
Single cell RNA-seq data offers us new resource and resolution to study cell type identity and its conversion. However, data analyses are challenging in dealing with noise, sparsity and poor annotation at single cell resolution. Detecting cell-type-indicative markers is promising to help denoising, clustering and cell type annotation.

Results
We developed a new method, scTIM, to reveal cell-type-indicative markers. scTIM is based on a multi-objective optimization framework to simultaneously maximize gene specificity by considering gene-cell relationship, maximize gene’s ability to reconstruct cell–cell relationship and minimize gene redundancy by considering gene–gene relationship. Furthermore, consensus optimization is introduced for robust solution. Experimental results on three diverse single cell RNA-seq datasets show scTIM’s advantages in identifying cell types (clustering), annotating cell types and reconstructing cell development trajectory. Applying scTIM to the large-scale mouse cell atlas data identifies critical markers for 15 tissues as ‘mouse cell marker atlas’, which allows us to investigate identities of different tissues and subtle cell types within a tissue. scTIM will serve as a useful method for single cell RNA-seq data mining.

Availability and implementation
scTIM is freely available at https://github.com/Frank-Orwell/scTIM.

Supplementary information
Supplementary data are available at Bioinformatics online.