bluuebunny/crossref_metadata_2025_split huggingface dataset:
An Algorithm for Coalition Formation of Swarm Aerial Vehicles Considering Communication Constraints
Authors: Zhu Mengyuan , Lv Na , Chen Kefan , Xue Bin , Pan Ying 
Published: December 2020

Abstract
To realize efficient coalition formation of swarm aerial vehicles to attack static and dynamic targets on future battlefields, this study proposes a real-time dynamic network model that takes into consideration constraints in communication range and communication delay. Moreover, by using the improved particle swarm optimization algorithm for decision-making of coalition formation, the SAV resources are made best use of and the size of the coalition is minimized. The simulation result shows that in a dynamic network on the battlefield, the proposed model can realize communication and form coalitions, and the optimized algorithm shows higher efficiency than other algorithms in finding solutions. Monte-Carlo simulation result shows that when the communication delay is small, expanding the communication network to find potential coalition members can effectively reduce the time for task completion and improve the system’s overall performance, but when the communication delay is large, it is better to select coalition members from neighboring SAVs.
Thermo-e.m.f. of hot current carriers in non-doped and doped crystals of a layered semiconductor n-InSe
Authors: Abdinov A Sh , Babayeva R F 
Published: December 2020

Abstract
Thermo-e.m.f. of hot current carriers is experimentally investigated in non-doped n-InSe crystals with a dark specific resistance of 2·103≤ρD0
≤9·106Ω·cm at 77 K and doped with erbium with 10−5≤NEr
≤10−1at.%. It was found that its absolute value (|UT
|), in addition to

E
^

and T0
, also depends on ρD0
and N. In the non-doped samples with ρD0
≤1·104Ω·cm and doped with NEr
>10−2 at.%, the dependence

|

U
T

|
(

E
^

)

consists of successive sections:

|

U
T

|
∼

E
^

2

,

|

U
T

|
∼

E
^

and

|

U
T

|
∼

E
^

0.5

. In non-doped with ρD0
≥ 5·104 Ω·cm and alloyed with 10−5≤NEr
≤ 10−2 at.% samples at T0
< 250 K and low-heating

E
^

dependence

|

U
T

|
(

E
^

)

obeys the law

|

U
T

|
∼

E
^

κ

with 2<κ≤5. The value of k monotonously depends on NEr
and reaches its maximum value at NEr
=5·10−4 at.%. At T0
>250 K, in all the samples studied, as well as in non-doped low-resistance and doped with NEr
>10−2 at.% samples for all T0
, the dependence

|

U
T

|
(

E
^

)

follows the theory of thermo-e.m.f. of hot current carriers in spatially homogeneous crystalline semiconductors. To explain the results in non-doped high-resistance and doped with 10−5≤NEt
≤10−2 at.% samples at T0
<250 K, the influence of random macroscopic defects must also be taken into account. A qualitative explanation of the results is proposed.
Modeling of physical processes during the propagation of ultrasonic waves in metallic media
Authors: Mozhayko A A , Davydov V V , Rud V Yu 
Published: December 2020

Abstract
The paper deals with the features of modeling physical processes during the propagation of ultrasonic waves in metallic media. A mathematical model for the propagation of shear vertical (SV) ultrasonic waves generated by a single element of a 32-element electromagnetic acoustic phased array has been developed. The calculation of the acoustic field of the 32-element SV electromagnetic acoustic transducer (EMAT) phased array was made. The total displacements for models with defects and without them were calculated. A computer simulation of the process of reflection of the ultrasonic beam from a defect was made. The developed model allows one to study the influence of shape, size, location of defects in the plate as well as the plate geometric parameters on the formation of the reflected signal.
Dielectric properties of ferroelectric diisopropylammonium bromide embedded in porous glass
Authors: Milinskiy A Yu , Baryshnikov S V , Charnaya E V , Uskova N I 
Published: December 2020

Abstract
The results of studying the dielectric constant σ’ and the third harmonic coefficient γ3ω of a new organic ferroelectric diisopropylammonium bromide (C6H16NBr, DIPAB), embedded in porous glasses with an average pore size of 100 nm are presented. Diffusion and shifting of the phase transition to low temperatures by 5 K were detected in comparison with bulk DIPAB. A decrease in the phase transition temperature in nanocomposites with DIPAB nanoparticles is qualitatively consistent with theoretical models of the size effects on the structural phase transition.
The effect of electrochemical oxidation time on the surface morphology of oxidized indium phosphide
Authors: Chernov E A , Samsonov V A , Grebenshchikova E A , Spivak Y M 
Published: December 2020

Abstract
The surface features of oxide layers (< 100nm) grown on single-crystal n-InP (100) samples in acid electrolyte on initial stage were investigated by atomic force and lateral force microscopy. The time of electrochemical oxidation of samples was the variable parameter. There is difference found in the oxide layer phase structure grown in the electrolyte during different time. The initially formed (17 s) islands (a nucleated oxide phase) were divided, then coalescence appeared (26 s), and the occurrence of a second phase was detected. With an increase in the time (40 s) of oxidation, the surface morphology becomes more uniform.
Coarse-grained and ultrafine-grained titanium high-temperature creep
Authors: Narykova M V , Kadomtsev A G , Betekhtin V I , Kolobov Yu R , Manohin S S , Tokmacheva A Yu 
Published: December 2020

Abstract
The publication describes the study of durability in tensile creep of VT1-0 commercial titanium in its two states-coarse-grained and ultrafine-grained. It is shown that the best temperature for log-term testing is 350°C. At this temperature, the ultrafine-grained titanium structure remains stable both during free annealing and durability testing. The obtained data enable retrieving the difference in fracture initiation energies for titanium in its coarse-grained and ultrafine-grained states.
Peculiarities of prismatic input of narrow-band radiation into Ag-ion diffusion waveguide
Authors: Vasileva M V , Lihachev A I , Sokolov R V , Nashchekin A V 
Published: December 2020

Abstract
The peculiarities of prism coupling elements input and output of narrow-band radiation into ion diffusion waveguide are researched. Gradient waveguide with a thickness of 1.67 μm was formed by ion exchange in K8 glass. The output signal intensity dependence on the input and output angles of incidence radiation was measured by developed automatic hardware-software system based on synchronous detection method to improve the signal-to-noise ratio. It was shown the maximum of output signal is reached at equal input and output angles.
Phase sensitive amplification in a periodically poled gradient lithium niobate waveguide
Authors: Galutskiy V V , Ivashko S S , Stroganova E V 
Published: December 2020

Abstract
The article presents a phase sensitive amplifier based on cascaded second harmonic generation and difference frequency generation in a waveguide in the gradient periodically poled lithium niobate. The influence of the composition gradient in periodically poled lithium niobate on phase and spectral dependence of amplification factor is described. The increase of 35% is shown in spectral range of the gradient amplifier in comparison with the gradientless one in the range of 1.55 μm. The dependence of amplification factor of the optical signal from the propagation direction in the waveguide channel in gradient PPLN is also presented.
The dynamics of the spatiotemporal distribution of excited atoms in a nanosecond discharge with a slot cathode
Authors: Ashurbekov N A , Iminov K O , Shakhsinov G S , Zakaryaeva M Z 
Published: December 2020

Abstract
The work is devoted to the study of the spatiotemporal dynamics of the production of excited atoms in an extended nanosecond discharge with a slot cathode in neon at medium gas pressures. The authors experimentally investigated the frame-by-frame dynamics of the spatiotemporal formation of the discharge optical irradiation with an exposure time of 5 ns and time intervals between frames of 2 ns. Under similar conditions, the concentration of excited neon atoms at metastable levels with a time resolution of about 10 ns was measured by laser absorption spectroscopy, and the current-voltage characteristics of the discharge were experimentally determined in a wide range of amplitudes of voltage pulses and gas pressures in the range of 1–60 Torr. To analyze the kinetic processes in the plasma source under study, numerical simulation of ionization processes in the Comsol Multiphysics software environment was performed using a special Plasma module.
Disturbing action of a cubical obstacle on the turbulent vertical-plate free convection boundary layer: RANS-based simulation
Authors: Levchenya A M , Smirnov E M , Smirnovsky A A , Zasimova M A 
Published: December 2020

Abstract
Steady-state RANS simulations were performed to establish disturbing action of a cubical obstacle on the turbulent free convection boundary layer in air along a vertical isothermally heated plate. In the case considered, the size of the cube mounted on the plate is about one-third the full thickness of the incoming boundary layer. Using the k-ω SST turbulence model, refined-grid numerical solutions have been obtained assuming the obstacle surfaces either adiabatic or isothermal. Characteristic three-dimensional features of the free convection flow past the cubical obstacle, such as the horseshoe-like vortex structures and the near-wake recirculation, are analyzed in comparison with the previously studied case dealing with the disturbing action of a circular cylinder of unit aspect ratio. Data on heat transfer augmentation near the obstacle are presented and discussed.
Creating graphene and graphite coatings on metal field electron emitters to improve their characteristics
Authors: Bernatskii Dmitriy , Pavlov Victor 
Published: December 2020

Abstract
The growth of graphene and graphite structures during the catalytic dissociation of benzene molecules on the surface of iridium and rhenium field electron emitters was studied using field electron and desorption microscopy. The emission and operational characteristics of the manufacture emitters were studied. The carbon coating increases the resistance of emitters to adsorption of gas molecules and ion bombardment. The grown graphite crystal allows you to get a beam of electrons localized in a narrow angle when emitting from the angle of the crystal. Metal emitters with a carbon coating in relatively poor vacuum conditions have greater stability and longer lifetime compared to metal emitters.
Refinement of the Rotational Deformation of the Viscoelastic Earth
Authors: Skorobogatyh I.V. , Aung Myo Zo , Perepelkin V.V. 
Published: December 2020

Abstract
Using a modal approach, this work determined the deformations caused by the pole tide for the axisymmetric model of a deformable Earth with a viscoelastic layer. We compared centrifugal moments of inertia variations with generally accepted expressions. The main properties of the theoretical pole tide are considered in comparison with those observed on the basis of processing high-precision measurements of the gravity acceleration.
Evolution of stationary flows of a viscous incompressible fluid in a plane diffuser
Authors: Kumakshev S.A. 
Published: December 2020

Abstract
For the classical formulation of the Jeffery-Hamel problem of the stationary flows of a viscous incompressible fluid in a plane diffuser the solutions are found. The bifurcation of the basic single-mode flow into flows containing sectors of flow and outflow (multi-mode flows) is found. The second bifurcation point (the bifurcation of three mode flow into four and five modes flows) is analyzed as well as the third one. The values of Reynolds number corresponding to the bifurcation points are calculated. The dependence of first bifurcation value vs. the half-expansion angle is presented.
Comparative evaluation of the effectiveness of the separation process with various types of movement of the separating surface
Authors: Blagoveshchensky I G , Shkapov P M 
Published: December 2020

Abstract
An analysis is made of the comparative efficiency of the process of separating spherical particles of finely divided loose product with different types of motion of the separating surface. The influence on the efficiency of the process of separation of the kinematic parameters of the motion of the screen surface is considered. A probabilistic approach to the analysis of sieving efficiency is used.
Study of the influence of the substrate material on the phase composition and thickness of Ti-Pb coatings deposited by a magnetron
Authors: Lozovan A A , Betsofen S Ya , Lyakhovetsky M A , Pavlov Yu S , Grushin I A , Lebedev M A , Sukhova T S , Kubatina E P 
Published: December 2020

Abstract
The structure of coatings deposited by reactive magnetron sputtering of Ti and Pb cathodes on substrates from Mo, 30HGSA and 304 steel was studied by X-ray diffraction. The thickness of the coatings was determined by the difference between the CTE of the coating and the substrate, which is maximum for Mo coating and minimum for 304 steel, for which the thickest coating was found, consisting of tetragonal modifications of PbO.
Bone Marrow and Peripheral Blood Findings in Patients Infected by SARS-CoV-2
Authors: Harris Cynthia K , Hung Yin P , Nielsen G Petur , Stone James R , Ferry Judith A 
Published: December 2020

Abstract

Objectives
Coronavirus disease 19 (COVID-19), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), is associated with diverse clinical, including hematologic, abnormalities. We describe peripheral blood and bone marrow findings in deceased and living patients with COVID-19.

Methods
We examined bone marrows from 20 autopsies and 2 living patients with COVID-19 using H&E-stained slides and immunohistochemical stains. Clinical history and laboratory values were reviewed. HScore was calculated to estimate risk of hemophagocytic lymphohistocytosis (HLH).

Results
The deceased patients included 12 men and 8 women (aged 32 to &gt;89 years; median, 63 years). Hematologic abnormalities included frequent neutrophilic leukocytosis, lymphopenia, anemia, and thrombocytopenia; one patient showed striking erythrocytosis. The bone marrows were all normocellular to hypercellular, most showing maturing trilineage hematopoiesis with myeloid left shift. In all 19 evaluable bone marrows, hemophagocytic histiocytes were identified. The HScore for secondary HLH ranged from 35 to 269 (median, 125; &gt;169 in 5 patients). Coinfections were identified in 6 patients. In 2 living patients, bone marrow showed maturing trilineage hematopoiesis, including one showing few hemophagocytic histiocytes.

Conclusions
Peripheral blood from deceased patients with COVID-19 frequently showed neutrophilic leukocytosis, lymphopenia, and, rarely, secondary polycythemia; hemophagocytosis was common in their bone marrow. Consistent with other studies, we provide histopathologic evidence of secondary HLH development in patients with COVID-19.
Do Brief Alcohol Interventions Reduce Driving After Drinking Among College Students? A Two-step Meta-analysis of Individual Participant Data
Authors: Mun Eun-Young , Li Xiaoyin , Lineberry Shelby , Tan Zhengqi , Huh David , Walters Scott T , Zhou Zhengyang , Larimer Mary E ,   in Collaboration with Project INTEGRATE Team
Published: December 2020

AbstractAimsCollege students who drink are at an increased risk of driving after drinking and alcohol-involved traffic accidents and deaths. Furthermore, the persistence of driving after drinking over time underscores a need for effective interventions to prevent future drunk driving in adulthood. The present study examined whether brief alcohol interventions (BAIs) for college students reduce driving after drinking.MethodsA two-step meta-analysis of individual participant data (IPD) was conducted using a combined sample of 6801 college students from 15 randomized controlled trials (38% male, 72% White and 58% first-year students). BAIs included individually delivered Motivational Interviewing with Personalized Feedback (MI + PF), Group Motivational Interviewing (GMI), and stand-alone Personalized Feedback (PF) interventions. Two outcome variables, driving after two+/three+ drinks and driving after four+/five+ drinks, were checked, harmonized and analyzed separately for each study and then combined for meta-analysis and meta-regression analysis.ResultsBAIs lowered the risk of driving after four+/five+ drinks (19% difference in the odds of driving after drinking favoring BAIs vs. control), but not the risk of driving after two+/three+ drinks (9% difference). Subsequent subgroup analysis indicated that the MI + PF intervention was comparatively better than PF or GMI.ConclusionsBAIs provide a harm reduction approach to college drinking. Hence, it is encouraging that BAIs reduce the risk of driving after heavy drinking among college students. However, there may be opportunities to enhance the intervention content and timing to be more relevant for driving after drinking and improve the outcome assessment and reporting to demonstrate its effect.
Estimation of the cure rate for distributions in the Gumbel maximum domain of attraction under insufficient follow-up
Authors: Escobar-Bach Mikael , Maller Ross , Van Keilegom Ingrid , Zhao Muzhi 
Published: December 2020

SummaryEstimators of the cured proportion from survival data which may include observations on cured subjects can only be expected to perform well when the follow-up period is sufficient. When follow-up is not sufficient, and the survival distribution of those susceptible to the event belongs to the Fréchet maximum domain of attraction, a nonparametric estimator for the cure proportion proposed by Escobar-Bach & Van Keilegom (2019) incorporates an adjustment that reduces the bias in the usual estimator. Besides the Fréchet, an important class of limiting distributions for maxima is the Gumbel class. We show that a very wide class of commonly used survival distributions, the generalized Gamma distributions, are in the Gumbel domain of attraction. Extrapolation techniques from extreme value theory are then used to derive, for distributions in this class, a nonparametric estimator of the cure proportion that is consistent and asymptotically normally distributed under reasonable assumptions, and performs well in simulation studies with data where follow-up is insufficient. We illustrate its use with an application to survival data where patients with differing stages of breast cancer have varying degrees of follow-up.
Immunoglobulin-fold containing bacterial adhesins: molecular and structural perspectives in host tissue colonization and infection
Authors: Chatterjee Shruti , Basak Aditya J , Nair Asha V , Duraivelan Kheerthana , Samanta Dibyendu 
Published: December 2020

ABSTRACTImmunoglobulin (Ig) domains are one of the most widespread protein domains encoded by the human genome and are present in a large array of proteins with diverse biological functions. These Ig domains possess a central structure, the immunoglobulin-fold, which is a sandwich of two β sheets, each made up of anti-parallel β strands, surrounding a central hydrophobic core. Apart from humans, proteins containing Ig-like domains are also distributed in a vast selection of organisms including vertebrates, invertebrates, plants, viruses and bacteria where they execute a wide array of discrete cellular functions. In this review, we have described the key structural deviations of bacterial Ig-folds when compared to the classical eukaryotic Ig-fold. Further, we have comprehensively grouped all the Ig-domain containing adhesins present in both Gram-negative and Gram-positive bacteria. Additionally, we describe the role of these particular adhesins in host tissue attachment, colonization and subsequent infection by both pathogenic and non-pathogenic Escherichia coli as well as other bacterial species. The structural properties of these Ig-domain containing adhesins, along with their interactions with specific Ig-like and non Ig-like binding partners present on the host cell surface have been discussed in detail.
Step-by-Step Evolution of Telomeres: Lessons from Yeasts
Authors: Červenák Filip , Sepšiová Regina , Nosek Jozef , Tomáška Ľubomír 
Published: December 2020

Abstract
In virtually every eukaryotic species, the ends of nuclear chromosomes are protected by telomeres, nucleoprotein structures counteracting the end-replication problem and suppressing recombination and undue DNA repair. Although in most cases, the primary structure of telomeric DNA is conserved, there are several exceptions to this rule. One is represented by the telomeric repeats of ascomycetous yeasts, which encompass a great variety of sequences, whose evolutionary origin has been puzzling for several decades. At present, the key questions concerning the driving force behind their rapid evolution and the means of co-evolution of telomeric repeats and telomere-binding proteins remain largely unanswered. Previously published studies addressed mostly the general concepts of the evolutionary origin of telomeres, key properties of telomeric proteins as well as the molecular mechanisms of telomere maintenance; however, the evolutionary process itself has not been analyzed thoroughly. Here, we aimed to inspect the evolution of telomeres in ascomycetous yeasts from the subphyla Saccharomycotina and Taphrinomycotina, with special focus on the evolutionary origin of species-specific telomeric repeats. We analyzed the sequences of telomeric repeats from 204 yeast species classified into 20 families and as a result, we propose a step-by-step model, which integrates the diversity of telomeric repeats, telomerase RNAs, telomere-binding protein complexes and explains a propensity of certain species to generate the repeat heterogeneity within a single telomeric array.
Hyperplane Arrangements and Mixed Hodge Numbers of the Milnor Fiber
Authors: Kutler Max , Usatine Jeremy 
Published: December 2020

Abstract
For a complex central essential hyperplane arrangement $\mathcal{A}$, let $F_{\mathcal{A}}$ denote its Milnor fiber. We use Tevelev’s theory of tropical compactifications to study invariants related to the mixed Hodge structure on the cohomology of $F_{\mathcal{A}}$. We prove that the map taking an arrangement $\mathcal{A}$ to the Hodge-Deligne polynomial of $F_{\mathcal{A}}$ is locally constant on the realization space of any loop-free matroid. When $\mathcal{A}$ consists of distinct hyperplanes, we also give a combinatorial description for the homotopy type of the boundary complex of any simple normal crossing compactification of $F_{\mathcal{A}}$. As a direct consequence, we obtain a combinatorial formula for the top weight cohomology of $F_{\mathcal{A}}$, recovering a result of Dimca and Lehrer.