bluuebunny/crossref_metadata_2025_split huggingface dataset:
Carbon dot-based molecular receptor for the colorimetric sensing of Cr(VI) from aqueous solutions
Authors: Daniel Sobhi 
Published: April 2022

A novel molecular probe was fabricated by the integration of a smart carbon dot and a Schiff's base viz 4-amino -N-[(2-hydroxyphenyl)methylidene] benzoic acid. The synthesised carbon dot composite was well characterised, and a colorimetric molecular probe derived from ecologically sound carbon dot composite materials was explored for the colorimetric sensing of Cr (VI) in aqueous solutions. The results demonstrated that the developed colorimetric sensor can effectively sense Cr (VI) in aqueous solutions even below the picomolar concentration range. Also, the method's practical applicability was checked by the recovery of Cr(VI) from real tap water samples by the standard addition method and was found to be in the range of 99–109%. Highlights Chromium (VI) is considered as a severe environmental pollutant, due to its highly toxic and carcinogenic properties. Low cost, highly sensitive sensors for the determination of Cr(VI) are highly demanded. We have demonstrated a colorimetric molecular probe for detecting Cr(VI) based on the inner filter effect (IFE). This CD-based nano sensor provides obvious advantages of simplicity, convenience, rapid response, high selectivity, and sensitivity, which have potential application for the detection of Cr(VI) in the environmental industry. The developed colorimetric sensor can be effectively adopted for the sensing of Cr(VI) in aqueous solutions even below the picomolar concentration range. Based on the colorimetric observation we can qualitatively determine the presence of Cr(VI) without the aid of any sophisticated analytical instruments. GRAPHICAL ABSTRACT
Factors affecting the shoulder functional profile in elite judo athletes
Authors: Delorme Julien , Blache Yoann , Degot Matthieu , Rogowski Isabelle 
Published: April 2022

ABSTRACTThe aim was to investigate the effects of sex, age, preferred judo technique, dominance, and injury history on the shoulder functional status of elite judo athletes. Sixty‐one elite judo athletes (38 males, age: 18.1 ± 1.2 years, body mass: 69.3 ± 13.3 kg, body height: 172.2 ± 9.8 cm, brown belt to second‐degree black belt) completed three questionnaires: Western Ontario Shoulder Instability, Western Ontario Rotator Cuff, and Shoulder Instability‐Return to Sport after Injury. They performed four physical tests: the glenohumeral rotator isometric strength test, upper quarter Y‐balance test, unilateral seated shot put test, and modified Closed Kinetic Chain Upper Extremity Stability Test. The results showed that the female athletes had less shoulder functional abilities than the male athletes (p < 0.001 to p = 0.02). The younger athletes had poorer shoulder stability and upper extremity power than the older athletes (p < 0.001 to p = 0.02), but their glenohumeral muscles were stronger in both internal (p = 0.03) and external (p = 0.005) rotations. All the judo athletes had similar bilateral differences in shoulder functional status, except for judokas who preferred throwing techniques (p = 0.01). Injury history affected self‐perceived functional status (p < 0.001), as well as upper extremity muscle capacity and neuromuscular control (p = 0.01 to p = 0.05). This study provides new insight into the shoulder functional status of elite judo athletes, which may aid in the development of sports‐specific injury prevention and return‐to‐sport programmes to reduce the risk of shoulder injury occurrence and recurrence.Highlights
Normalized levels of upper extremity abilities must be sex‐ and age‐specific in prevention programmes.
Prevention programmes may focus on muscle bilateral and anteroposterior symmetry.
Prevention programmes may include psychological training tailored to the sex of judo athletes.
QUBIC VII: The feedhorn-switch system of the technological demonstrator
Authors: Cavaliere F. , Mennella A. , Zannoni M. , Battaglia P. , Battistelli E.S. , de Bernardis P. , Burke D. , D'Alessandro G. , De Petris M. , Franceschet C. , Grandsire L. , Hamilton J.-Ch. , Maffei B. , Manzan E. , Marnieros S. , Masi S. , O'Sullivan C. , Passerini A. , Pezzotta F. , Piat M. , Tartari A. , Torchinsky S.A. , Viganò D. , Voisin F. , Ade P. , Alberro J.G. , Almela A. , Amico G. , Arnaldi L.H. , Auguste D. , Aumont J. , Azzoni S. , Banfi S. , Baù A. , Bélier B. , Bennett D. , Bergé L. , Bernard J.-Ph. , Bersanelli M. , Bigot-Sazy M.-A. , Bonaparte J. , Bonis J. , Bunn E. , Buzi D. , Chanial P. , Chapron C. , Charlassier R. , Cobos Cerutti A.C. , Columbro F. , Coppolecchia A. , De Gasperis G. , De Leo M. , Dheilly S. , Duca C. , Dumoulin L. , Etchegoyen A. , Fasciszewski A. , Ferreyro L.P. , Fracchia D. , Gamboa Lerena M.M. , Ganga K.M. , García B. , García Redondo M.E. , Gaspard M. , Gayer D. , Gervasi M. , Giard M. , Gilles V. , Giraud-Heraud Y. , Gómez Berisso M. , González M. , Gradziel M. , Hampel M.R. , Harari D. , Henrot-Versillé S. , Incardona F. , Jules E. , Kaplan J. , Kristukat C. , Lamagna L. , Loucatos S. , Louis T. , Marty W. , Mattei A. , May A. , McCulloch M. , Mele L. , Melo D. , Montier L. , Mousset L. , Mundo L.M. , Murphy J.A. , Murphy J.D. , Nati F. , Olivieri E. , Oriol C. , Paiella A. , Pajot F. , Pastoriza H. , Pelosi A. , Perbost C. , Perciballi M. , Piacentini F. , Piccirillo L. , Pisano G. , Platino M. , Polenta G. , Prêle D. , Puddu R. , Rambaud D. , Rasztocky E. , Ringegni P. , Romero G.E. , Salum J.M. , Schillaci A. , Scóccola C.G. , Scully S. , Spinelli S. , Stankowiak G. , Stolpovskiy M. , Supanitsky A.D. , Thermeau J.-P. , Timbie P. , Tomasi M. , Tucker C. , Tucker G. , Vittorio N. , Wicek F. , Wright M. , Zullo A. 
Published: April 2022

Abstract
We present the design, manufacturing and performance of the horn-switch system developed for the technological demonstrator of QUBIC (the Q&U Bolometric Interferometer for Cosmology). This system consists of 64 back-to-back dual-band (150 GHz and 220 GHz) corrugated feed-horns interposed with mechanical switches used to select desired baselines during the instrument self-calibration. We manufactured the horns in aluminum platelets milled by photo-chemical etching and mechanically tightened with screws. The switches are based on steel blades that open and close the waveguide between the back-to-back horns and are operated by miniaturized electromagnets. The measured electromagnetic performance of the feedhorns agrees with simulations. In particular we obtained a return loss around -20 dB up to 230 GHz and beam patterns in agreement with single-mode simulations down to -30 dB. The switches for this prototype were designed and built for the 150 GHz band. In this frequency range we find return and insertion losses consistent with expectations (<-25 dB and ∼-0.1 dB, respectively) and an isolation larger than 70 dB. In this paper we also show the current development status of the feedhorn-switch system for the QUBIC full instrument, based on an array of 400 horn-switch assemblies.
Analyzing the Hubble tension through hidden sector dynamics in the early universe
Authors: Aboubrahim Amin , Klasen Michael , Nath Pran 
Published: April 2022

Abstract
The recent analysis from the SH0ES collaboration has confirmed the existence of a Hubble
tension between measurements at high redshift (z > 1000) and at low redshift (z < 1)
at the 5σ level with the low redshift measurement giving a higher value.
In this work we propose a particle physics model that can help alleviate the Hubble tension
via an out-of-equilibrium hidden sector coupled to the visible sector.
The particles that populate the dark sector consist of a dark fermion, which acts as dark matter,
a dark photon, a massive scalar and a massless pseudo-scalar. Assuming no initial population of
particles in the dark sector, feeble couplings between the visible and the hidden sectors via
kinetic mixing populate
the dark sector even though the number densities of hidden sector particles
never reach their equilibrium distribution and the two sectors remain at different temperatures.
A cosmologically consistent analysis is presented where a correlated evolution of the visible and the hidden sectors with coupled Boltzmann equations involving two temperatures, one for the visible
sector and the other for the hidden sector, is carried out. The relic density of the dark matter constituted of dark fermions
is computed in this two-temperature formalism.
As a consequence, BBN predictions are upheld with a minimal contribution to ΔN
eff. However, the out-of-equilibrium decay of the massive scalar to the massless pseudo-scalar close to the recombination time causes an increase in ΔN
eff that can help weaken the
Hubble tension.
A prototype of quantum von Neumann architecture
Authors: Wang Dong-Sheng 
Published: April 2022

Abstract
A modern computer system, based on the von Neumann architecture, is a complicated system with several interactive modular parts. It requires a thorough understanding of the physics of information storage, processing, protection, readout, etc. Quantum computing, as the most generic usage of quantum information, follows a hybrid architecture so far, namely, quantum algorithms are stored and controlled classically, and mainly the executions of them are quantum, leading to the so-called quantum processing units. Such a quantum–classical hybrid is constrained by its classical ingredients, and cannot reveal the computational power of a fully quantum computer system as conceived from the beginning of the field. Recently, the nature of quantum information has been further recognized, such as the no-programming and no-control theorems, and the unifying understandings of quantum algorithms and computing models. As a result, in this work, we propose a model of a universal quantum computer system, the quantum version of the von Neumann architecture. It uses ebits (i.e. Bell states) as elements of the quantum memory unit, and qubits as elements of the quantum control unit and processing unit. As a digital quantum system, its global configurations can be viewed as tensor-network states. Its universality is proved by the capability to execute quantum algorithms based on a program composition scheme via a universal quantum gate teleportation. It is also protected by the uncertainty principle, the fundamental law of quantum information, making it quantum-secure and distinct from the classical case. In particular, we introduce a few variants of quantum circuits, including the tailed, nested, and topological ones, to characterize the roles of quantum memory and control, which could also be of independent interest in other contexts. In all, our primary study demonstrates the manifold power of quantum information and paves the way for the creation of quantum computer systems in the near future.
Exact and approximate solutions of the system of interrelated equations of the theory of creep and long-term strength
Authors: Arutyunyan A R , Saitova R R 
Published: April 2022

Abstract
The problem of creep and long-term strength of metallic materials and alloys is considered. Under the long action of high temperatures and relatively small stresses, many metallic alloys and pure metals loose plasticity and undergo brittle fracture. This problem in mechanics of materials is known as the phenomenon of thermal brittleness. To solve this problem Kachanov and Rabotnov introduced the concept of damage into the mechanics of materials. Also, they suggested a system of interrelated kinetic equations for creep deformation and damage parameter. In this work, a modified system of interrelated kinetic equations for creep deformation and damage parameter are formulated. In these equations, the mass conservation law is taking into account and the relative changes of material density are considered as a damage parameter. The results of numerous studies on the changes of porosity and density of various metals and alloys due to the formation and development of micropores and microcracks under conditions of high-temperature creep make it possible to consider density as an integral measure of the accumulation of structural microdefects. Different analytical and numerical solutions of the considered system of kinetic equations are obtained. It is shown, that the character of the curves according to different solutions is identical and agrees with the corresponding experimental results. It was shown, that the numerical solution completely coincides with the case of purely brittle fracture and small deformations. The long-term strength criterion is formulated. Comparison of theoretical creep and long-term strength curves with experimental results for 2.25Cr-1Mo steel is given. A good agreement between the corresponding theoretical and experimental results is observed.
Influence of metal texture and loading rate on heat release under quasi-static tension
Authors: Sudienkov Yu V , Smirnov I V , Zimin B A 
Published: April 2022

Abstract
This paper presents a study of the influence of the initial structure of metal materials obtained from plastic deformation methods on the processes of heat generation under quasi-static tension and low cyclic tests. Experimental data on the dependence of changes in the fraction of latent energy during deformation on the anisotropy of the initial structure of polycrystalline specimens of copper M1, duralumin D16, titanium VT6, as well as the grain size of copper M1 and magnesium alloy AZ31B are presented. It is shown that the thermodynamics of the plastic deformation process significantly depends on the anisotropy of the initial structure of the materials, brought about by the material processing used, as well as on the features of the lattice and the development of a meso-defect structure.
On the influence of an elastic film to the attenuation of wave motion between viscous and moving ideal fluid
Authors: Belonozhko D , Ochirov A 
Published: April 2022

Abstract
The regularities of wave motion along the interface of viscous and ideal liquids along which the surfactant is distributed are investigated in theory. The relationship between the decay decrements of capillary–gravitaty waves and the nature of maxima and minima surfactant concentration redistribution is established. The phenomenon has been analized in depend on the film elasticity in the presence of tangential velocity discontinuity at the boundary of the media. Influence of the tangential velocity gap on the relationship is established.
The dependence of the deformation behavior of fiberglass pipes on the initial disorientation of reinforcement subjected to repeated-static internal hydrostatic pressure and axial tension
Authors: Karapetyan K A , Sh Valesyan S , Muradyan N S 
Published: April 2022

Abstract
The problems of influence of the technological reinforcement disorientation on the deformation behavior of composite tubular elements subjected to repeated-static internal hydrostatic pressure and axial tension, as well as the resistance to fracture of these elements subjected to the above-mentioned loading are discussed.
The experimental part of research is carried out applying thin-walled tubular elements manufactured from the fiberglass fabric prepreg based on the modified epoxy resin.
It is established that a possible deviation of the reinforcement angle from 60 to 80 taking place during the processing of material into goods has little effect on the fracture resistance both subjected to the internal hydrostatic pressure and axial tension of fiberglass pipes manufactured so that the directions of reinforcing fiberglass fabric warp and ones axis are coincided.
Meanwhile, the following was stated that the accompanied shearing deformations are arising besides the basic cyclic deformations (noted in the direction of force application) for initially disorientation fiberglass pipes in difference from non-disoriented ones at the condition of pulsating (irregular) loading by the above-mentioned load-bearing factors.
Calculations are proved that the reinforcement disorientation direction in the above-underlined limits is brought to the significant decrease of the energy dissipation coefficient of fiberglass pipes.
The statement aiming the constructional solution of the problem is formulated in a sense of negative influence of the technological reinforcement disorientation on the composite tubular elements functioning at the conditions of cyclic axial tension and internal hydrostatic pressure.
Inhomogeneous transversely isotropic space under influence of concentrated power and temperature sources
Authors: Kryvyi O F , Morozov Yu O 
Published: April 2022

Abstract
The problem of constructing fundamental solutions to the thermoelasticity problem for a piecewise-homogeneous transversely isotropic space is reduced to the matrix Riemann problem in the space of generalized slow growth functions. As a result of the solution of which, were obtained expressions in explicit form for the components of the stress tensor and the displacement vector in plane of connection of transversely isotropic elastic half-spaces containing concentrated stationary heat sources. The temperature distribution is investigated depending on the thermophysical characteristics of the half-space materials.
Finding coefficients in the problem of a cylindrical shell with a circular cutout
Authors: Kashtanova S V , Rzhonsnitskiy A V 
Published: April 2022

Abstract
In the present paper a cylindrical shell with a circular cutout is considered. There have not yet been explicit formulas for the field of stresses and after reviewing some ideas of the derivation of the solution of this problem, the authors can present how this can be done. A new approach is based on the separation of variables in the basis function by Fourier decomposition and on the proof of reducibility of the system. This way has a strict mathematical foundation, and for the boundary condition in the form of axial tension the limit transition leads for the Kirsch problem, as expected. In this work a finding of coefficients for small parameter is illustrated and the limit transition is shown.
On melting temperature of carbon produced in detonation combustion of acetylene
Authors: Prokhorov E S 
Published: April 2022

Abstract
A mathematical model of gas detonation of over-riched hydrocarbon-oxygen mixtures has been formulated. The model implies numerical studying the equilibrium flows of detonation products provided that there is condensation of free carbon. To describe thermodynamic properties of carbon condensate, reference data for graphite have been used. The calculations have been compared with the known results of experimental research, in which the detonation of acetylene-oxygen mixture in a tube with one closed end results in nanoscale particles of carbon material with special properties. We assumed that melting temperature of such a material, which is about 3100 K, is lower than that of graphite. Only such a way of correcting melting temperature yields the best agreement (with accuracy of about 3%) between calculation and experimental dependence of detonation front velocity on molar fraction of acetylene in the mixture.
Investigation of phase and temperature perturbations induced by a candle using Hilbert optics methods
Authors: Arbuzov V A , Arbuzov E V , Dubnishchev Yu N , Zolotukhina O S , Lukashov V V 
Published: April 2022

Abstract
The method of multiwave RGB-optical Hilbert diagnostics of the phase and temperature spatial structure of the flame (in an air flow heated by a candle flame) at a fixed moment of time is discussed. The object of study satisfies the model of axial symmetry of the torch associated with the vertical orientation of the candle. The reliability of the received results is confirmed by comparing the reconstructed radial temperature by experimental hilbertogram with data measured by a thermocouple. The flickering effect of the flame was not taken into account in the work, this is the subject of further research.
Determination of the fire hazard of forest plantations depending on surface fuels under laboratory combustion conditions using thermophysical parameters
Authors: Malenko A A , Chichkarev A S , Kasymov D P , Agafontsev M V , Savin M A 
Published: April 2022

Abstract
The work aims to investigate experimentally the assessment of the combustion parameters of forest vegetation based on received ignition and combustion characteristics according to the presence of surface forest fuels (FF). The research was carried out using the laboratory test facility, which allowed simulating various types of combustion. Using the thermocouple method, as well as the heat flow sensor, made it possible to control the thermal characteristics. The maximum heat fluxes that are characteristic of FF fractions, such as oak bark, Salix acutifolia branches, and oak wood reached 49±3.5 kW/m2. Among grass species, the highest heat fluxes were recorded during the combustion of narrow-leaved bluegrass (47.4±3.21 kW/m2). The amount of stored energy directly depends on the material structure, density, and initial moisture content. It should be taken into account that the fire hazard of a forest area depends on pyrological properties, and especially on the moisture content of the dominant type of fuel bed.
Experimental studies of the combustion of pulverized coal to form the basis for training a neural network
Authors: Butakov E B , Pochtar A S , Vinogradov S V , Burdukov A P 
Published: April 2022

Abstract
In this paper, we considered the solution to the problem of efficient and environmentally friendly combustion of hydrocarbon-containing fuels and the prevention of emergencies in combustion chambers and boiler plants. On the basis of the existing scientific background and the existing instrumental and experimental base, modern technologies for automating the combustion process using machine learning methods have been developed. Automation will reduce energy costs and prevent possible emergencies at thermal power plants and combustion chambers. The approbation of the technology and the formation of a data corpus for training the network was carried out using semi-industrial fire installations with a thermal power of about 5 MW, which make it possible to vary the parameters of fuel combustion in a wide range and, accordingly, to implement various combustion modes.
Study of the processes of joint grinding and ignition of coal with wood raw materials
Authors: Kuznetsov A V 
Published: April 2022

Abstract
The conditions for obtaining composite fuel “coal-pine sawdust” on a semi-industrial roller mill RM-20 were selected: the rotor speed was varied from 10 (300 rpm) to 40 Hz (1200 rpm). The ignition of the obtained samples was studied, and the optimal composition of the composite was determined.
Effect of repetitive irradiation on ion saturation current of laser ablation plasma using 1 kHz repetitive laser
Authors: Igarashi K , Iwasa M , Takahashi K , Sasaki T , Kikuchi T 
Published: April 2022

Abstract
We demonstrated 100 shots of burst laser irradiation with an Al target using a 1 kHz repetitive pulse laser. By using the laser, we generated ablation plasmas with a repetition rate of 1 kHz. The time-evolution of ion saturation current density in the generated ablation plasma was measured using the orifice probe. The result shows that the waveforms on 100 spikes were observed. The ion saturation current density decreased rapidly from the first to the third shot and reached a minimum value at the fourth shot. After the fourth shot, it reached 1 μA/mm2 at the 53rd shot and settled at 0.5 μA/mm2. We extracted the time-evolution of ion saturation current densities of the first, 10th, 50th and 100th shots. The drift velocities were estimated by Time of Flight from the time-evolution of current. The result shows that the drift velocity of the ablation plasma increases with the increase in the number of shots.