bluuebunny/crossref_metadata_2025 huggingface dataset:
Retorno Deportivo Luego de Reconstrucción Primaria de Ligamento Cruzado Anterior con Injerto Hueso-Tendón Patelar-Hueso Autólogo: Análisis de Factores Relacionados
Authors: Pakuts A. , Martin L. , Contador J.
Published: April 2020

Objective Analyze return to sports and related factors after primary anterior cruciate ligament reconstruction.

Methods Observational descriptive study. 173 patients operated by the same surgeon and standardized technique (patellar autograft) who answered a questionnaire at least 12 months post procedure were included. Questionnaire included Subjective IKDC, Tegner activity level (Pre and Postoperative) and questions elaborated by the group.

Results Mean age was 30.8 years, 85% were men, 73% practiced soccer and median postoperative IKDC was 71. Follow up until questionnaire response was 28 months. Males had a better return to sports than females (70% vs 48%, p = 0.037). Tegner pre-injury level was 5 vs 4.3 postoperative, (p < 0.001). Return to sports was 67% according to Tegner scale and 66% by self-assessment. Return to similar previous activity level was 57% by Tegner scale but 24% by direct questions. Of those patients, 51% have fear of re-injury and 26% by reasons other than knee or surgery. We didn't find association between meniscal injuries and return to sports rate. Patients with chondral injuries had lower rates in return to sports (35% vs 60%, p = 0.002). Subjects that returned to sports had higher IKDC scores (73.5 vs 64.3, p < 0.001).

Conclusions We found 67% return to sports and 57% to the preinjury level. Positive return to sports factors were male sex, absence of chondral injury and better functional outcome. Psychological factors such as fear of injury is frequent in patients who don't achieve previous levels of activity.
Major Trauma and Severe Burn: A Synergistic Mortality. Case Report and Literature Review
Authors: Pujol Oriol , Selga Jordi , Serracanta Jordi , Porcel Juan Antonio , Andrés-Peiró José Vicente
Published: April 2020

Case Presentation A 42-year-old man was transferred to our institution after a high-energy accident (an explosion). He presented second-degree burns on 20% of the total body surface area (TBSA), affecting the lower hemiabdomen and the lower right limb. He also presented a supraintercondylar open fracture of the right femur (Gustilo I). The burns were treated with debridement and coverage with mesh graft, while the fracture required an early transitory transarticular external fixation with delayed definitive osteosynthesis. Our patient presented good local and systemic evolution. We can offer a eleven-month follow-up.

Discussion The literature supports that the combination of trauma and burn injuries is a relatively rare pattern, which may explain the lack of knowledge and studies on this subject. This double injury has demonstrated a synergistic effect on mortality. The management of soft tissues in the coexistence of an open fracture and a burn in the same limb is a challenge. The method and timing of the treatment of the fracture directly impacts the treatment of the burn (and vice versa), and most authors tend to treat the fracture first. All of the studies reviewed emphasized the importance of the multidisciplinary approach.

Conclusions We have presented a complex case combining major trauma and severe burns. Although there is a lack of studies in the literature on this subject, the papers state that this is an unusual pattern with a synergistic effect on mortality. In our experience, the management of soft tissues and the multidisciplinary approach play a central role, as it is also stated in the literature. The management of these patients is still controversial, and more studies are needed.
The role of game genres and gamers’ communication networks in perceived learning
Authors: Jung Chang Won
Published: April 2020

The present study examined the educational roles of games that were not designed for pedagogical purposes. With respect to the roles of gamers’ communication—communication networks, network diversity, and heterogenous discussion—three specific sub-objectives of the present work include: (1) to examine the extent to which games can be social learning environments, (2) to examine how gamers’ communication contributes to perceived learning, and (3) to evaluate the relationship between game genre’s unique characteristics and learning effects. This work statistically tested a series of research hypotheses using empirical data obtained from a national survey of Korean gamers (N = 1392). The results from hierarchical multiple regression analysis indicate that game genres and gamers’ communicative networks were significant predictors of perceived game learning. Importantly, game genres that are considered by policymakers to be violent and addictive were found to contribute to learning. Additionally, gamers’ communication variables that are not closely related to education and politics significantly predicted their learning. Based on the results, this study suggests that game coplaying or gamers’ social networks should be considered important for socio-cultural learning. Moreover, the current study provides empirical evidence that exposure to diverse perspectives during game playing contributes significantly to not only tolerance and deliberative democracy but also the socio-political learning of gamers. In this regard, the present study expands the literature on pedagogy (learning effects), political communication (benefits of heterogeneous/deliberative discussions), and game studies (game addiction/gaming disorder). Thus, this study provides new insights for current research on the educational roles of games.
FDI in hot labour markets: The implications of the war for talent
Authors: Becker Bettina , Driffield Nigel , Lancheros Sandra , Love James H.
Published: April 2020

This paper highlights an inherent contradiction that exists within investment promotion activities in rich countries. Since the financial crisis, many inward investment agencies have shifted their activities from job creation per se to seeking to attract investment in high-tech activities. Such knowledge-intensive sectors are engaged in what has become referred to as “the war for talent”, so locations need to understand their value proposition to firms, especially where labour is tight. This paper explores the implications of this, in terms of the impact on employment and earnings of high skilled labour. We show that, because skill shortages already exist in many of these sectors, seeking to attract inward investment in these sectors simply causes the earnings of such workers to be bid up, and employment in the incumbent sector to fall. We highlight the over-riding importance that firms place on the availability of skilled labour when determining locations, and how policies which promote labour market flexibility, particularly through investment in skills to address skill shortages, can significantly mitigate the adverse effects, which tend to be more keenly felt in poorer regions of Europe where skilled labour is in even shorter supply.
Low voltage thin film transistors based on solution-processed In2O3:W. A remarkably stable semiconductor under negative and positive bias stress
Authors: Paxinos Kosta , Antoniou Giorgos , Afouxenidis Dimitrios , Mohamed Ahmed , Dikko Umar , Tsitsimpelis Ioannis , Milne William I. , Nathan Arokia , Adamopoulos George
Published: April 2020

Thin film transistors (TFTs) based on metal oxide semiconductors have been attracting considerable attention over the last two decades as alternatives to a-Si due to their superior electrical performance coupled with optical transparency to visible light and mechanical flexibility. They have become highly desirable for applications in backplane electronics for active-matrix organic light-emitting diodes including flexible displays and other newly emerging areas. Indeed, the performance of oxide-based TFTs, i.e., the carrier mobility, exceeds that of amorphous a-Si-based TFTs, and their stability characteristics exceed those of organic semiconductors.
Raman fingerprints and exciton-phonon coupling in 2D ternary layered semiconductor InSeBr
Authors: Hu Xuerong , Du Luojun , Wang Yadong , Lahtinen Jouko , Yao Lide , Ren Zhaoyu , Sun Zhipei
Published: April 2020

Compared to other two-dimensional (2D) crystals with single or binary elements, 2D ternary layered materials have unique physical properties for potential applications due to the stoichiometric variation and synergistic effect. Here, we report the first investigation of lattice dynamics and interactions between the exciton and lattice degrees of freedom in a 2D ternary semiconductor: indium-selenide-bromide (InSeBr). Via linear polarization resolved Raman scattering measurements, we uncover three Raman modes in few-layer InSeBr, including two A1g and one Eg modes. Moreover, through the combination of temperature-dependent Raman scattering experiments and theoretical calculations, we elucidate that few-layer InSeBr would harbor strong coupling between excitons and phonons. Our results may provide a firm basis for the development and engineering of potential optoelectronic devices based on 2D ternary semiconductors.
Magnon-phonon interactions in magnon spintronics (Review article)
Authors: Bozhko D. A. , Vasyuchka V. I. , Chumak A. V. , Serga A. A.
Published: April 2020

Nowadays, the interaction between phonon and magnon subsystems of a magnetic medium is a hot topic of research. The complexity of phonon and magnon spectra, the existence of both bulk and surface modes, the quantization effects, and the dependence of magnon properties on applied magnetic field, make this field very complex and intriguing. Moreover, the recent advances in the fields of spin caloritronics and magnon spintronics as well as the observation of the spin Seebeck effect in magnetic insulators points on the crucial role of magnons in spin-caloric transport processes. In this review, we collect the variety of different studies in which magnon-phonon interaction play important role. The scope of the paper covers the wide range of phenomena starting from the interaction of the coherent magnons with surface acoustic wave and finishing with the formation of magnon supercurrents in the thermal gradients.
The dependence of transport coefficient on spatial dimensions and grid shape in the direct simulation Monte Carlo based on Green–Kubo relation
Authors: Cai Guobiao , Ren Xiang , He Bijiao , Tang Zhenyu , Yuan Junya
Published: April 2020

Since the essence of the direct simulation Monte Carlo program is to decouple the motion and collision of molecules, this will cause errors of gas transport properties or the collision separation error (CSE). Based on the Green–Kubo relation, this paper studies the dependence of the CSE on the spatial dimension and grid shape, especially the anisotropy of gas transport properties for various collision schemes in multi-dimensional spaces. The results show that the CSEs caused by the traditional no time counter and the simplified Bernoulli-Trials collision schemes in different dimensional spaces are consistent, and they are isotropic for some grid shapes, while the CSE caused by the nearest neighbor method depends on the spatial dimension, and it is anisotropic. These results are verified by simulation of one-dimensional Fourier flow.
Immersions of open Riemann surfaces into the Riemann sphere
Authors: Forstnerič F.
Published: April 2020

In this paper we show that the space of holomorphic immersions from any given open Riemann surface

into the Riemann sphere

is weakly homotopy equivalent to the space of continuous maps from

to the complement of the zero section in the tangent bundle of

. It follows in particular that this space has

path components, where

is the number of generators of the first homology group

. We also prove a parametric version of the Mergelyan approximation theorem for maps from Riemann surfaces to an arbitrary complex manifold, a result used in the proof of our main theorem.
Distribution of prime numbers and the discrete spectrum of the Laplace operator
Authors: Popov D. A.
Published: April 2020

We obtain a class of explicit formulae each of which gives an expression for the remainder term in the asymptotic equation for the Chebyshev function in terms of the spectrum of the Laplace operator on the fundamental domain of the modular group.
Uniform attractors for measure-driven quintic wave equations
Authors: Savostianov A. K. , Zelik S. V.
Published: April 2020

This is a detailed study of damped quintic wave equations with non-regular and non-autonomous external forces which are measures in time. In the 3D case with periodic boundary conditions, uniform energy-to- Strichartz estimates are established for the solutions, the existence of uniform attractors in a weak or strong topology in the energy phase space is proved, and their additional regularity is studied along with the possibility of representing them as the union of all complete bounded trajectories.

Bibliography: 45 titles.
Wegener’s Wortsatz and the notion of
sentence
Authors: Tenchini Maria Paola
Published: April 2020

This contribution aims to introduce Wegener’s defense of
the notion of Wortsatz (word sentence) as a
construction having a sentence status within the debate about the
notion and the definition of sentence and its structure that
developed in Germany during the second half of the nineteenth
century and the beginning of the 20th century. This period was
marked by different approaches towards this issue. In his work,
Wegener foreshadowed some of the topics which would be central in
the later pragmatic theory of communication, but on the other side
he still related to the psychologistic view of the sentence
structure.
Why is it so hard to establish gestalt ideas within
linguistics?
Authors: Teixeira Kalkhoff Alexander M.
Published: April 2020

I call holistic and relativistic approaches to language
gestalt linguistics. Although there have been some efforts to
integrate them into linguistics, they have never formed part of
mainstream linguistics. This article tackles the “why” of this
diagnosis. Historic exclusion of psychology from linguistics, the
fact that the perceptual gestalt theory is not a genuine linguistic
theory and that it deals with preconscious grouping principles but
not with symbolic linguistic units, the vagueness of gestalt
concepts, and the lack of a proper formalism are aspects of the
answer.
Klaproth, Balbi and the language atlas
Authors: Solleveld Floris
Published: April 2020

Julius Klaproth’s Asia Polyglotta (1823)
and Adriano Balbi’s Atlas ethnographique du Globe
(1826a, 1826b) were the first examples of so-called ‘language
atlases’. This article investigates how these atlases presented
language as an object of study, and how the study of language
intersected with history, geography, ethnography, and other learned
pursuits in Klaproth’s and Balbi’s research programmes. This gives
us a new perspective on the shaping of linguistics as a discipline
and the role of non-Indo-European languages in it.
Saussure/Mallarmé
Authors: Testenoire Pierre-Yves
Published: April 2020

Since the sixties, Ferdinand de Saussure has often been
compared with Stéphane Mallarmé. The purpose of this study is to
identify whether this association Saussure/Mallarmé is really
justified from a historical point of view. First, we examine the
biographical links between the Genevan linguist and the French poet.
Then we focus on similarities in their theories of language. We
finally indicate that this comparison between Saussure and Mallarmé
highlights recent evolutions of scholars’ reception of Saussure.

Le rapprochement entre la figure de Saussure et celle de Mallarmé a souvent été pratiqué depuis les années soixante. L’objectif de cet article est d’identifier si cette association Saussure/Mallarmé est justifiée d’un point de vue historique. Dans un premier temps, on examinera les connexions biographiques entre le linguiste genevois et le poète français puis on s’intéressera à ce qui rapproche leurs théories du langage. On montrera qu’en définitive la comparaison entre Saussure et Mallarmé est surtout révélatrice des évolutions récentes de la réception saussurienne.
Introducing and translating Otto Jespersen in China in the past
100 years
Authors: Qu Changliang
Published: April 2020

As a prolific linguist Otto Jespersen used to have a
strong impact on the Chinese linguists who wrote descriptive
grammars in the first half of the 20th century for the Chinese
language. However, his influence was interrupted during the Cold War
decades and then neglected in the land that once embraced his ideas.
In the recent decade, a revived interest in Jespersen propels a
retrospect on the complicated history of his influence in China.
Based on the critiques and translations published in China, this
paper intends to explore both the linguistic and the
extra-linguistic reasons for the history of the Chinese
acknowledgement of Jespersen’s linguistic ideas.
On the reception and revivification of Cartesian
linguistics
Authors: Thomas Margaret
Published: April 2020

Fifty years after its publication, it is timely to return
to Noam Chomsky’s Cartesian linguistics to explore
what this controversial text accomplished, what it didn’t
accomplish, and for whom. I begin with the context of midcentury
American linguists’ historical consciousness into which
Cartesian linguistics initially appeared, then
review responses to the book by (first) philosophers and historians
of linguistics, and (second) generative linguists versus linguists
not associated with generativism, especially those in the United
States. I evaluate whether the book achieved Chomsky’s own goals,
then close by calling attention to an emerging second life of
Cartesian linguistics, beginning around
2000.
Linguists and lawyers
Authors: Kibbee Douglas A.
Published: April 2020

The first article of the United Nations’ Universal
Declaration of Human Rights states that “all men are born free and
equal in dignity and rights”. It prohibits discrimination based on
language, among other criteria, and defines a number of areas in
which rights are guaranteed, including legal proceedings, education,
elections, health care, commerce and the workplace. Each of these
areas has a linguistic component, and every country addresses that
linguistic component according to national traditions. After a brief
history of the linguistic rights, the first part of this talk will
focus on how the legal system in the United States treats those who
do not speak English. In a second part we will examine issues within
the English language itself, how the legal system uses prescriptive
grammars and dictionaries to reach its decisions. While the examples
presented will focus on the United States, the issues are universal
and readers are encouraged to reflect on how the same issues are
addressed in other national contexts.
The origin and development of a language management framework
Authors: Jernudd Björn H.
Published: April 2020

The author’s reminiscences recount ideas that came together from the 1960s, out of which came Language Management Theory. Most ideas have already been articulated someplace, somehow, and are already ‘out there’, if anyone cares to find them. Therefore, they are available to be compiled and formulated to respond to changing societal circumstances and intellectual insights. I will attempt to identify and discuss strands of ideas that came together and that moved researchers towards articulating a LM discourse, in particular the Language Management Theory.
Research perspectives from East Asia
Authors: Fan Sau Kuen
Published: April 2020

This paper presents an overview of language management in contact situations which typically involve speakers of unbalanced language ability. Rather than trying to give a comprehensive coverage of how the concept of language management has been applied to the study of contact situations, the focus here is a discussion of the theoretical significance of the concept of contact situations for the study of language management. Apart from situations involving what has been traditionally referred to as native and non-native speakers, it is suggested that further investigation into the complexity of contact situations involving speakers of diverse language backgrounds can not only contribute to the development of the theory of language management but also the broader field of language studies.
Researching language management in Central Europe
Authors: Sherman Tamah
Published: April 2020

This contribution contextualizes the research conducted using the language management approach in Central Europe, demonstrating the influence of local disciplinary traditions as well as real language, communicative and sociocultural problems. It considers J. V. Neustupný’s original inspiration in the approaches to language cultivation developed over the years by the Prague School, the contemporary Czech institutional basis for the continuation of cultivation-based research, and the emergence of research topics sparked by the political and socioeconomic changes after 1989. One of these topics is the management of linguistic diversity, which reveals manifestations of power in issues such as foreign language teaching policy, language choice in the workplace and the position of minority languages.
Language selection in contact situations
Authors: Takeda Kanako , Aikawa Hiroko
Published: April 2020

This study investigates the language selection of international students in an English-medium graduate program and their language management within the context of the university’s language policy. Based on semi-structured interviews, the findings of the study show that although international students follow or are forced to follow the university’s language policy, especially in formal contexts, they flexibly select English or Japanese as a lingua franca, or mix these languages, particularly in informal contexts. Moreover, sometimes interactants use two different lingua franca languages in the same interaction. Therefore, it can be argued that it is necessary to develop an understanding of the actual language use of international students and to reconsider the role of both the official language and local language in the program.
Diverging and intersecting management
Authors: Fairbrother Lisa
Published: April 2020

Although research applying LMT has commonly focused on the perspective of one individual participant or actor when considering the noting, evaluation and adjustments planned and implemented towards deviations from norms, in reality, multiple parties in the same interaction may be managing deviations simultaneously and their processes may diverge or intersect. Based on examples from past studies on predominantly micro-level interaction, this chapter provides a foundation for the development of a typology of the different types of diverging and intersecting management. It was found that interactional constraints, norm diversity and contextual constraints, including power dynamics, are the main factors that determine whether management will diverge or intersect. The analysis also reveals the intertwining of macro- and micro-level processes.
Processes of language enquiries
Authors: Prošek Martin
Published: April 2020

The Czech Language Institute of the Czech Academy of Sciences in Prague is a public scientific institution, which provides language consulting services over the phone. Since January 2013, the phone interactions between the linguists at the Institute and enquirers have been recorded for further linguistic research. In this paper, I outline preliminary observations concerning the configuration of the interactions. I propose a simple categorisation of the main factors determining the configuration of the dialogue. This categorisation is supported by evidence in the form of authentic dialogues illustrating the ways in which enquirers present their problems, and the arguments both sides use to support their views, etc.
Language management in life story interviews
Authors: Saruhashi Junko
Published: April 2020

This research analyzes interactions in life story interviews with first generation Zainichi Koreans, specifically when they noticed perception gaps in the interviewer’s questions and tried to negotiate those gaps. It was found that the interviewees used two contrastive strategies: one described her perceptions using a monological storytelling manner and the other responded to the questions in an interactive mode. In the interactive mode particularly, interviewees can see whether their previous language management worked or not, which affects their motivation to talk. Applying Language Management Theory in narrative studies (i.e., micro-level analysis) provides two macro-level contributions. One is gaining a holistic understanding of the speaker. The other is a contribution to the methodology of life story interviews, by including LMT analysis between the first interview session and the second interview session.
Ribosome heterogeneity in stem cells and development
Authors: Li Dan , Wang Jianlong
Published: April 2020

Translation control is critical to regulate protein expression. By directly adjusting protein levels, cells can quickly respond to dynamic transitions during stem cell differentiation and embryonic development. Ribosomes are multisubunit cellular assemblies that mediate translation. Previously seen as invariant machines with the same composition of components in all conditions, recent studies indicate that ribosomes are heterogeneous and that different ribosome types can preferentially translate specific subsets of mRNAs. Such heterogeneity and specialized translation functions are very important in stem cells and development, as they allow cells to quickly respond to stimuli through direct changes of protein abundance. In this review, we discuss ribosome heterogeneity that arises from multiple features of rRNAs, including rRNA variants and rRNA modifications, and ribosomal proteins, including their stoichiometry, compositions, paralogues, and posttranslational modifications. We also discuss alterations of ribosome-associated proteins (RAPs), with a particular focus on their consequent specialized translational control in stem cells and development.
Feature size control using surface reconstruction temperature in block copolymer lithography for InAs nanowire growth
Authors: Löfstrand Anette , Svensson Johannes , Wernersson Lars-Erik , Maximov Ivan
Published: April 2020

Here we present a method to control the size of the openings in hexagonally organized BCP thin films of poly(styrene)-block-poly(4-vinylpyridine) (PS-b-P4VP) by using surface reconstruction. The surface reconstruction is based on selective swelling of the P4VP block in ethanol, and its extraction to the surface of the film, resulting in pores upon drying. We found that the BCP pore diameter increases with ethanol immersion temperature. In our case, the temperature range 18 to 60 °C allowed fine-tuning of the pore size between 14 and 22 nm. A conclusion is that even though the molecular weight of the respective polymer blocks is fixed, the PS-b-P4VP pore diameter can be tuned by controlling temperature during surface reconstruction. These results can be used for BCP-based nanofabrication in general, and for vertical nanowire growth in particular, where high pattern density and diameter control are of importance. Finally, we demonstrate successful growth of indium arsenide InAs vertical nanowires by selective-area metal-organic vapor phase epitaxy (MOVPE), using a silicon nitride mask patterned by the proposed PS-b-P4VP surface reconstruction lithography method.
Influence of the abdominal coil position in children magnetic resonance imaging
Authors: Akhmad E. , Sergunova К. , Semenov D. , Petraikin A. , Andreychenko A.
Published: April 2020

A quality of received signal in magnetic resonance imaging (MRI) depends, among the other, on the correct use of radiofrequency (RF) coils. The problem of quality decrease is especially relevant when scanning children, because in some cases, coils of unsuitable size or position are used. In this work, we demonstrated that the position of the abdominal coil affects the presence of signal-to-noise homogeneity. Based on the results of the work, it is reasonable to give recommendations to children’s clinics on the correct use of radio frequency coils.
High-amplitude radiofrequency pulses for metadevice-assisted MRI
Authors: Brui E A , Akhmetzyanov Sh Sh , Andreychenko A E
Published: April 2020

An aim of this study was to investigate whether magnetic resonance imaging of extremities benefits from the recently introduced wireless metamaterial based radiofrequency devices. Adapted radiofrequency safety limits provide an opportunity for application of high-amplitude radiofrequency pulses for the metadevice-assisted magnetic resonance imaging. The use of Shinnar-Le-Roux pulses for this purpose is explored. The performance of two widely used musculoskeletal pulse sequences is evaluated for standard SINC pulses and for Shinnar-Le-Roux pulses designed for this specific application. Metadevices provide room for image quality improvement and shortening of the study time while preserving the image quality.
Subwavelength gratings for creation and focusing of cylindrical vector beams
Authors: Degtyarev S.A. , Porfirev A.P. , Khonina S.N.
Published: April 2020

In this paper we derive the equations for the subwavelength grating vector of polarization element that creates the arbitrary order radially polarized beam. We show that the element can be implemented with different shape for different orientations of the input and output polarization. There are under consideration different essential cases of the first and the second order polarization. The second-order element can be sun- or mira- shape and axicon shape. Intermediate shapes are also possible.
Magnetic nanoparticles as vehicles for multidisciplinary medicine
Authors: Dendrinou-Samara C , Giannousi K , Antonoglou O
Published: April 2020

Magnetic nanoparticles (MNPs) can play a distinct role in theranostics such as magnetic drug delivery and hyperthermia via their distribution to the targeted area. The preparation of such MNPs is a challenging multiplex task that requires the optimization of size, magnetic and surface properties for the achievement of desirable target selectivity, while the sustained drug release is a prerequisite.
Quantum light sources based on deterministic microlenses structures with (111) In(Ga)As and AlInAs QDs.
Authors: Derebezov I A , Haisler V A , Haisler A V , Dmitriev D V , Toropov A I , Rodt S , Helversen M von , de la Haye C , Bounouar S , Reitzenstein S
Published: April 2020

The results of the development and implementation of a single photon source based on a bottom semiconductor Bragg reflector, top deterministic GaAs microlens structures and a single (111) In(Ga)As QD are presented. The structure of the microcavity ensures effective pumping of a single (111) In(Ga)As QD and high emission output efficiency, a clear single – photon emission was detected with a second – order correlation function at zero delay g(2)(0) = 0.07. A system of QD’s on the basis of AlXIn1-XAs/AlYGa1-YAs solid solutions has been studied. The usage of broadband AlXIn1-XAs solid solutions as the basis of quantum dots makes it possible to expand considerably the spectral emission range into the short-wave region, including the wavelength region near 770 nm being of interest for the design of aerospace systems of quantum cryptography. The optical characteristics of single AlXIn1-XAs quantum dots grown according to the Stranski–Krastanov mechanism are studied by the cryogenic microphotoluminescence method.
BIC-solitons in one-dimensional photonic crystal slab
Authors: Dolinina D A , Yulin A V
Published: April 2020

Dynamics of light in the periodically grated waveguide with defocusing Kerr nonlinearity was studied. Dynamically stable bound states in the continuum (BIC) were found in the considered system. Several types of nonlinear localized waves including solitons formed on BIC background were discovered. Stability and dynamics analyzes of the solitons were provided. A protocol of possible experimental observation of dark solitons was suggested.
Difficulties faced by Yee’s scheme in photonics problems
Authors: Dombrovskaya Zh O , Belov A A
Published: April 2020

Popular Yee’s scheme for the FDTD method faces a number of difficulties for problems in layered media: if dielectric permittivity is discontinuous, the accuracy strongly deteriorates, if magnetic permeability is also discontinuous at the same points, the scheme does not allow to perform computation. We provide rigorous mathematical explanation of these difficulties and show them to have fundamental nature. For problems involving dielectric media interfaces, we propose technique allowing to improve the accuracy.
Wide band enhancement of transverse magneto-optic Kerr effect in magnetite
Authors: Dyakov S.A. , Spitzer F. , Akimov I. , Yavsin D.A. , Pavlov S.I. , Verbin S.Y. , Tikhodeev S.G. , Gippius N.A. , Pevtsov A.B. , Bayer M.
Published: April 2020

Transverse magneto-optical Kerr effect (TMOKE) is known to be an effective tool for external magnetic field control of optical properties of magnetoplasmonic crystals. In some applications there is a demand for the pronounced TMOKE in the wide wavelength range. In this work we experimentally and theoretically demonstrate that a magnetite based magnetoplasmnic crystal exhibit a multiple wide band enhancement of TMOKE response in transmission compared to a plain magnetite film without metal. Our RCWA calculations are in good agreement with experimental results.
Perovskite solar cell improvement by gold nanoparticles prepared by laser ablation in liquid
Authors: Furasova A.D. , Lamanna E. , Colabro’ E. , Makarov S.V. , Di Carlo A.
Published: April 2020

Improving performance of lead halide perovskites solar cells (PSC) by nanoparticles (NPs) with localized surface-plasmon resonances is one of the most actively developing direction in modern photovoltaics. For this purpose, we propose to use simple and cheap way for NPs fabrication based on laser ablation of gold target in liquid, which can be added in any layer of PSC. By using these NPs we improve CH3NH3PbI3 (MAPbI3) perovskite-based solar cells performance from 17.7 to 18.6% via the increase of fill factor and voltage at zero current. The chosen concentration of Au NPs in the devices does not raise parasitic absorption, whereas the external quantum efficiency grows in all working distance of PCS. The proposed method can be simply implemented for PSCs with various compositions and architectures.
Collective resonances in hybrid photonic-plasmonic nanostructures
Authors: Ershov Alexander E. , Bikbaev Rashid G. , Rasskazov Ilia L. , Gerasimov Valeriy S. , Timofeev Ivan V. , Polyutov Sergey P. , Karpov Sergey V.
Published: April 2020

We present the theoretical model to predict the spectral position of Rayleigh anomalies emerged in hybrid system consisting of periodic array of plasmonic nanodisks embeded into the middle of defect layer of 1D photonic crystal (PhC). The spectral positions of these new emerged Rayleigh anomalies agree well with the results of exact simulations with Finite-Difference Time-Domain (FDTD) method.
Wave propagation in elastic bi-materials with a doubly periodic array of interface cracks
Authors: Golub Mikhail V. , Doroshenko Olga V. , Fomenko Sergey I. , Zhang Chuanzeng
Published: April 2020

In the present study, the scattering of plane elastic waves by a doubly periodic array of planar interface cracks is investigated. The problem is solved using the boundary integral equation method. The influences of the shape of cracks and lattice in the periodic array on wave transmission through an interface are studied. It is revealed that introduction of the periodic array of interface cracks allows to increase wave energy transmission compared to the interface without cracks. It is shown that the phenomenon is related to cut-off frequencies location and decrease in the amplitudes of the crack-opening-displacements.
Irreducible Cartesian multipole decomposition of scattered light with explicit contribution of high order toroidal moments
Authors: Gurvitz E , Ladutenko K , Dergachev P , Evlyukhin A , Miroshnichenko A , Shalin A
Published: April 2020

Multipole decomposition is a powerful tool for analysis of electromagnetic systems. This work considers high order irreducible Cartesian multipole moments in approximation of electric 32-pole and magnetic 16-pole. The explicit contributions to scattering of high order toroidal moments up to toroidal electric octupole and toroidal magnetic quadrupole are demonstrated for a dielectric high refractive index scatterer.
Silicon-silver metasurface based on regular bars as an effective SERS substrate
Authors: Ivanov Andrey , Sarychev Andrey K. , Bykov Igor , Boginskaya Irina , Lagarkov Andrey , Ryzhikov Ilya , Nechaeva Natalia , Kurochkin Ilya
Published: April 2020

Observation of the surface enhanced Raman scattering (SERS) is hampered by the background surface luminescence. We investigate the metasurface made of periodic silicon micro bars. Bars are covered by the silver nanolayer. Computer simulations as well as real experiment reveal an anomalous optical response of the metasurface, which is due to the excitation of various metal-dielectric surface resonances. We demonstrate the enhancement of the Raman signal from a monolayer of 4-Mercaptophenylboronic acid (MPBA) when it is deposited on the microbar metasurface. The micro-bar metasurface exhibits large Raman/luminescence (signal/noise) ratio. As result it operates as a very efficient SERS substrate.
New functionality in microwave interferometry by application of metastructure as a tunable beam-splitter
Authors: Kraftmakher G , Butylkin V , Kazantsev Y , Mal’tsev V
Published: April 2020

A new functionality of microwave interferometry is demonstrated by application of metastructure, meta-surface or meta-atom as controlled original beam-splitter in modified interferometer on basis of h-plane waveguide tee. Specific selectively-tunable interference peaks are observed in transmission of microwaves due to influence of metastructure properties on shape, frequency and intensity of interference peak, when controlled structure resonance approaches interference peak. We investigated following structures as a beam-splitter: ferrite plate, individual conductive resonant element in the form of varactor-loaded butterfly dipole, and metastructure wire grating/varactor-loaded copper strip placed orthogonally. The obtained results open new possibilities to design microwave multifarious multiband spectral filtering and implement selective electric or magnetic tuning, required in multifunctional and multichannel wireless communication.
3D Nanomanipulation: Design and applications of functional nanostructured bio-materials
Authors: Lega P.V. , Orlov A.P. , Frolov A.V. , Subramani R. , Irzhak A.V. , Koledov V.V. , Smolovich A.M. , Shelyakov A.V.
Published: April 2020

Recent progress in the development of the new functional materials opens up exciting possibilities for designing reconfigurable micro- and nano-structures and for operating mechanical nanotools which are controlled by external fields or heat. The nanotools such as nanotweezers with an active layer thickness of about several tenths of nm, and whose overall size is of the order of 1 μm can be applied to different micro- and nanoobjects. The present report gives an overview of the application of mechanical nanotools in 3D nanomanipulation of bio-nano objects such as micro biofibers DNA etc. The future prospects of mechanical bottom up nanomanipulation for biomedical technology, food technology are discussed.
Electric field-induced segregation in a sky-blue perovskite light-emitting diode based on CsPbBr2Cl:PEO composite
Authors: Liashenko T.G. , Anoshkin S.S. , Pushkarev A.P. , Pakštas Vidas , Zakhidov A.A. , Makarov S.V.
Published: April 2020

Perovskite light-emitting diodes (pero-LEDs) is a rapidly developing technology that is supposed to supersede existing ones in the near future. In comparison with organic and A
III
B
V
analogues, pero-LEDs possess the following advantages: very narrow spectral linewidth of electroluminescence (EL), spectral tunability in the whole visible range and the possibility of a cost-effective large-scale fabrication by means of wet chemistry techniques. CsPbX3 (X = Cl, Br, I) are the most robust perovskites suitable for LEDs production due to their excellent optical properties. There are numerous reports describing green and red electroluminescence of such tribromide and triiodide materials, respectively, whereas a blue color is not easy to achieve. The main obstacles in the way of development of blue pero-LEDs based on chlorine salts are poor solubility of perovskite precursors in the same organic solvents as well as light- and an electric field-induced phase instability of mixed-halide (CsPbBr3−x
Cl
x
) materials. The latter leads to red-shift of EL spectrum with the increase in applied voltage. In this work, we present a design of a single-layer sky-blue pero-LED based on CsPbBr2 Cl-poly(ethylene oxide) (PEO) thin film, study the morphology of the emissive layer, its phase instability under UV illumination and in the electric field.
Cerebral metabolism after one hyperbaric oxygenation session: 1H and 31P magnetic resonance spectroscopy study
Authors: Manzhurtsev A V , Vasiukova O R , Sergeeva V V , Menshchikov P E , Ublinskiy M V , Akhadov T A , Semenova N A
Published: April 2020

The aim of this study is to elucidate the effect of one HBO session on the concentrations of metabolites detectible by 1H and 31P magnetic resonance spectroscopy. An activation of energy metabolism that manifested in the decrease of creatinephosphate (PCr), pHint and increase α-ATP signal after a HBO session is revealed. Other ATP resonances remain unchanged. Also the reduction of N-acetyl aspartate by 3% in mediolateral prefrontal cortex (MPFC) with p<0.05 and in posterior cingulate cortex (p<0.1) was found. Glutamate levels remained unchanged after HBO session. The demonstrated metabolic changes may signify the activation of power supply processes in order to compensate the energy expenses caused by the excess of O2.
Rapid synthesis and optical properties of CsPbBr2Cl perovskite nanolasers
Authors: Markina D.I. , Pushkarev A.P. , Shishkin I.I. , Zuev D.A. , Makarov S.V.
Published: April 2020

Nanostructures able to generate laser emission in a broad spectral range of 420-820 nm have become highly demanded objects for nanophotonic and optoelectronic applications such as photonic integrated circuits and ultrasensitive Fabry–Pérot nanosensors. The latter require high quality factors (Q) of stimulated emission which can be achieved in cesium lead halide perovskite nanowires (NWs). In this regard, it is difficult to underestimate the relevance of their rapid and scalable synthesis at ambient conditions. In this work we study optical properties of high-quality CsPbBr2Cl NWs emitting in the 510-520 nm range manufactured by spraying at ambient conditions. The mechanism of NWs formation is based on their ligand-assisted reprecipitation (LARP). Ligands that form bonds with surface Pb atoms and, hence, prevent agglomeration of perovskite crystallites are supposed to be chosen according to the size of the certain perovskite unit cell. This approach allows obtaining numerous separate nanowires with lateral sizes of less than 1 μm and lengths of 2-50 μm. When the NWs are pumped with UV pulsed excitation above the lasing threshold (P ≈ 55 μJ cm−2) they exhibit high-quality stimulated emission with Q-factors at lasing modes up to 5600.
Propagating plasmon in periodical graphene structure
Authors: Mashinskiy K V , Popov V V , Morozov M Yu , Fateev D V
Published: April 2020

The transformation of electromagnetic wave into propagating plasmon in periodical dual-grating-gated graphene with asymmetric unit cell structure is theoretically investigated. The conditions of cancelling the transmission of the electromagnetic wave through the graphene structure and Fabry-Perot blocking the reflection are applied. We found out optimal unit cell asymmetry for maximum transformation incident wave into plasmon modes with the wavevectors multiplied the inverse length of the structure period.
Dielectric metamaterials with hexagonal lattice
Authors: Maslova E E , Rybin M V
Published: April 2020

We consider all-dielectric photonic structures with electric response consist of dielectric rods arranged in a hexagonal lattice. We construct gap map as a function of rod permittivity for a constant filling factor by analyzing photonic band diagrams. A near-boundary phase with a strong spatial dispersion is found, whereas in the case of a square lattice this phase does not exist. We observe ε-near zero modes in a metamaterial phase, which do not depend on a lattice orientation and a structure boundary.
Arrays of Metal Nanostructures for Plasmon-enhanced Spectroscopy
Authors: Milekhin A.G. , Kuznetsov S.A. , Rodyakina E.E. , Anikin K.V. , Milekhin I.A. , Veber S.L. , Latyshev A.V. , Zahn D.R.T.
Published: April 2020

We report on the study of localized surface plasmon resonances (LSPRs) arising in arrays of metal (Au) nanoclusters, dimers, and nanoantennas under the influence of external electromagnetic radiation. Using nanolithography, the plasmonic arrays with different morphologies including cylindrical nanoclusters and dimers, linear and H-type nanoantennas were fabricated. Their LSPR frequencies were determined from the analysis of optical reflection and IR spectra. LSPR frequency depends strongly on morphology of metal nanostructures and is varied from visible to terahertz spectral range with variation of the structures from cylindrical nanoclusters to the nanoantennas with a high aspect ratio. We established the interconnection between the structural parameters of the plasmonic arrays and their LSPR frequencies based on the results of 3D electrodynamic simulations.
Optically resonant graphite nanostructures
Authors: Nominé A , Ghanbaja J , Bruyère S , Krasilin A A , Mezenov Y A , Milichko V A
Published: April 2020

Here we report on the graphite crystalline nanostructures demonstrating polarization and size dependent light scattering due to the generation of different Mie-type optical modes inside.
A role of a picosecond strain in an ultrafast optically-driven phase transition in VO2 nanostructures
Authors: Mogunov Ia A , Lysenko S , Fedianin A E , Kent A J , Akimov A V , Kalashnikova A M
Published: April 2020

We report on experimental picosecond acoustic studies of an ultrafast photoinduced insulator-to-metal and structural transition in VO2 nanostructures epitaxially grown on Al2O3 substrates with different orientations. Applying a pump-probe technique with combined excitation of a sample with picosecond strain and femtosecond laser pulses we demonstrate that dynamical strain of moderate amplitude of 0.1% has a pronounced impact on ultrafast photoinduced phase transition in VO2 nanohillocks. This enables novel path for controlling such transitions at picosecond and nanometer scales. Our experiments also allowed characterizing elastic and photo-elastic properties of the photo-induced metallic phase in VO2 and to relate them to the properties of the equilibrium phase. Furthermore, we demonstrate the generation of picosecond strain pulses upon laser-induced excitation of thin epitaxial VO2.
Gd2O3, SiO2-Gd2O3 and SiO2-MnO2 nanoparticles as potential MRI contrast agents
Authors: Myshkina A.V. , Bazhukova I.N. , Zlygosteva O.A. , Byzov I.V. , Kasyanova V.V. , Sokovnin S.Y. , Ilves V.G.
Published: April 2020

Gd2O3, SiO2-Gd2O3 and SiO2-MnO2 nanoparticles were produced by the method of pulsed electron evaporation of oxide targets with condensation of the vapors in a vacuum. These materials are considered as probable contrast agents for magnetic resonance imaging (MRI). The Gd2O3 nanoparticles exhibit a rather high r1 and r2 relaxivities. These results point to the potential of using nanocrystals for MRI diagnosis. The mesoporous nanostructures SiO2-Gd2O3 and SiO2-MnO2 could be considered as multimodal theranostic agents.