bluuebunny/crossref_metadata_2025 huggingface dataset:
Determination of the miners’ individual injury risk as a result of the dynamic manifestation of rock pressure
Authors: Kaverzneva Tatyana , Rodionov Vladimir , Skripnik Igor , Zhikharev Sergey , Polyukhovich Maxim
Published: December 2023

The injury rate in underground coal mining is extremely high. One of the factors leading to injuries in underground mining is rock bursts. Although rock bursts are not the most common cause of injury in this industry, their consequences are extremely severe. At the same time, the level of injuries as a result of the manifestation of this factor remains high and almost does not change over the past years. The paper presents a method for determining the risk of injury of varying severity as a result of rock bursts. Multifunctional security systems that allow obtaining information about the state of the rock mass are analyzed. Based on the data obtained from these systems, the probability of a rock burst is assessed. The paper also deals with the processing of statistical information on light, severe and fatal injuries caused by rock bursts in the coal mines of the Kuznetsk coal basin. On the basis of statistical data and the results of measurements of the main parameters of the rock mass, the value of the individual risk is determined. It is advisable to correlate the obtained value with the average occupational risk in production.
Nonlinear vibrations of earth structures
Authors: Mirsaidov M.M. , Ishmatov A.N. , Urinov B.Kh. , Khazratkulov I.A. , Rayimov A.O.
Published: December 2023

This article offers a detailed analysis of the current state of plane structure dynamics, addressing the complexities posed by non-homogeneous materials exhibiting nonlinear elastic and viscoelastic properties during real-life operations. The study proposes a comprehensive mathematical model and algorithm to investigate the dynamic behavior of such structures, employing the non-linear hereditary Boltzmann-Volterra theory to describe viscoelastic material properties accurately. Nonlinear oscillatory systems are analyzed using Lagrange equations based on the d’Alembert principle. The problem is approached through a multi-step process. Initially, the linear elastic problem of the structure’s natural oscillations is solved to determine its natural frequencies and modes of oscillations. Subsequently, these eigenmodes are employed as coordinate functions to address forced nonlinear oscillations in viscoelastic non-homogeneous systems. The complexity of the problem necessitates solving a Cauchy problem comprising a system of nonlinear integrodifferential equations. To illustrate the methodology, the study examines the Gissarak earth dam, considering real operational conditions and nonlinear, viscoelastic material properties near resonant modes of vibrations. Utilizing numerical methods, the dynamic behavior of the structure is analyzed, assessing displacements and stress components at different time points under non-stationary kinematic action. Stress concentration regions within the structure are identified for resonant vibrations, allowing the evaluation of its strength. Furthermore, the impact of nonlinear elasticity and viscoelasticity on the structural dynamics is quantified. This research provides valuable insights into the behavior of plane non-homogeneous structures, considering real-world scenarios and material complexities, ultimately contributing to an improved understanding of structural dynamics and facilitating the identification and mitigation of potential structural challenges.
Modernisation of filter design with bulk dispersed media
Authors: Rudnev Sergey , Krikun Aleksandra , Feoktistova Veronika
Published: December 2023

The object of research in this article is the design of the filter with bulk dispersed media; this type of device has a wide application within the framework of water treatment for technological needs of food enterprises. On the basis of the data of the previously obtained complex of theoretical and experimental studies of the process of bulk filtration of mechanically activated aqueous solutions, the main purpose of the work is to find effective options for modernisation of the filter design with bulk dispersed media, allowing one to improve the filtration process, namely to increase productivity and improve the quality of filtrate. The research methods included both theoretical (methods of analysis, comparison, etc.) and experimental measures aimed at studying vibromechanical activation of the initial solution in the process of filtration, studying the physical and chemical properties of the activated solution, and determining the rational modes of mechanical action. The results obtained in the course of the research are determined by the basis of the modernisation of the device, the changes made in the design had a positive effect on its operation, and the cycle time changed by 20-22 %. The achievements of the device modernisation are represented by: built-in vibromechanoactivators; washing and regeneration without the use of reagents; measurement by sensors of indicators in the device tanks before and after the filtering process; improved wear resistance and durability of the casing coating inside and outside. On this basis, further plans are focused on the realisation of the design ideas into an experimental industrial unit and subsequent research in laboratory and industrial conditions.
A survey of cache placement algorithms in content delivery networks
Authors: Makhkamov Bakhtiyor , Khasanov Nazirjon
Published: December 2023

This paper analyzes cache deployment algorithms in content delivery networks (CDN), which are important for increasing content delivery speed, reducing network traffic, and ensuring scalability. A CDN is a geographically distributed network infrastructure, which is placed on the Internet and is aimed at reliably delivering content to users, as well as reducing traffic on the networks of communication operators. A content delivery network serves as an important element in today’s internet infrastructure to ensure fast and secure delivery of content around the world. When using a content delivery network, it uses local cache servers to keep copies of content on a central resource server closer to end users. This reduces latency and increases content delivery speed. Cache placement algorithms determine which cache server to store content and where to place it. As the demand for high-quality content continues to grow, caching algorithms play an increasingly important role in efficiently delivering content to users around the world. This article analyzes caching algorithms in CDNs, including their advantages, disadvantages, and application areas.
Development of software and hardware designed to automate activities related to the storage, transmission and processing of information
Authors: Boyko Andrey , Karacheva Galina , Agalakova Anna , Kravtsov Kirill , Divaeva Anna
Published: December 2023

This article describes the development of an automated information system for an online store that would meet all modern requirements. Particular attention was paid to both hardware architecture and content architecture. AIS provides the functionality that is traditional for online stores, which is necessary for an enterprise to conduct e-commerce: searching through a catalog of goods, processing and paying for orders online, the application will also help save on personnel, since its functionality does not require such a large number of employees whose duties can be delegated to the system being developed.
Algebraic reconfiguration of LSTM network for automated video data stream analytics using applied machine learning
Authors: Pylov Petr , Maitak Roman , Protodyakonov Andrey
Published: December 2023

Recurrent neural networks (RNNs) are a powerful tool for processing sequential data. However, the standard LSTM architecture, despite its effectiveness in capturing long-range dependencies, can still encounter some problems when dealing with particularly complex sequences. In this paper, we present a mathematical modification of LSTM that extends the basic advantages of the long short-term memory model and will help to model complex dependencies in data more accurately.
Justification of the method of surface plastic deformation to strengthen the surface of the shaft under the cuff during repair
Authors: Nesterkin Gennady , Konkin Mikhail , Golinitsky Pavel , Cherkasova Elmira , Antonova Uliana
Published: December 2023

The shaft-seal connection is a critical element of any unit, and its reliability is important to ensure the service life of the entire assembly unit. Treatment by surface plastic deformation makes it possible to provide hardening to a depth of up to 2 mm, microhardness increases on average by 150% relative to the initial value, and reaches a value of 6500 MPa. Residual stresses after SPD always have a negative value, the depth of their distribution exceeds the depth of distribution of increased microhardness by 1.5 times, which makes it possible to increase the service life.
Determination of shear modulus for fiber composite using experimental-calculation methods
Authors: Tatus Nikolay
Published: December 2023

The article is devoted to the description and analysis of the results of the experiment on orthogonal fiberglass disk twisting. The possibilities of joint experiment and finite element method simulation are shown, in the case when the data obtained in the experiment are taken as initial data for the computational model. The proposed method is characterized by sufficient simplicity, the values obtained for the shear modulus show good agreement with the results of other researchers.
Mathematical model of loading a semi-trailer bearing system with an autonomous diesel power plant on turn
Authors: Klychnikova M.V. , Kapitonov M.V.
Published: December 2023

Road trains consisting of a tow truck and a semi-trailer are widely used nowadays in Russia for cargo transportation, including in different territories. However, in mountainous operating conditions compared to plain ones, the reliability of the load-bearing system of semitrailers of road trains is significantly reduced, as a result of which there is a mismatch between the flow of semitrailer failures and scheduled repairs, which significantly increases the costs of their operation. Different approaches can be used to reduce these costs. Many domestic and foreign scientists have dealt with the issues of reliability of auto transport systems. Their works contain a lot of valuable information of applied significance, but the reliability of the load bearing system of semi-trailers with an autonomous diesel power plant of road trains and its improvement have not received sufficient attention.
Broadband storage-ring mass and lifetime spectrometry
Authors: Litvinov Yuri A. , Sanjari M. Shahab
Published: December 2023

The mass and half-life of a nucleus are its basic properties which reflect its structure and decay properties. These data are among the most important nuclear physics inputs to astrophysical nucleosynthesis modelling. Tremendous experimental efforts are carried out to obtain yet unknown quantities, which are as a rule belong to short-lived nuclei far away from stability. Storage ring mass spectrometry is a technique ideally suited for addressing many different nuclear species at the same time. In the last few years it went through major developments regarding nuclear mass determinations, thereby boosting its efficiency, sensitivity and precision. A non-destructive detection capability is being presently implemented aiming at simultaneous mass, lifetime and decay branching measurements. Recent developments and future perspectives are briefly discussed.
Isomeric Lifetime Measurement in the Neutron-rich 189Ta
Authors: Alhomaidhi Sultan , Sahin Elif , Werner Volker , Jolie Jan , Regan Patrick , Pietralla Norbert , Gerl Jürgen , Górska Magdalena , Benzoni Giovanna , Mistry Andrew K. , Hubbard Nicolas , Aggez Guler , Albers Helena M. , Arici Tugba , Armstrong Michael , Banerjee Akashrup , Das Biswarup , Davinson Thomas , Hall Oscar , Kojouharov Ivan , Koseoglou Pavlos , Mikolajczuk Michal , Podolyák Zsolt , Polettini Marta , Rudigier Matthias , Schaffner Henning , Wollersheim Hans-Jürgen , Yaneva Aleksandrina , Boutachkov Plamen , Dickel Timo , Haettner Emma , Heggen Henning , Hornung Christine , Knöbel Ronja , Kostyleva Daria , Kurz Nikolaus , Kuzminchuk Natalia , Mukha Ivan , Pietri Stephane , Plaß Wolfgang , Scheidenberger Christoph , Tanaka Yoshiki , Weick Helmut , Ahmed Usama , Aktas Özge , Algora Alejandro , Appleton Corrigan , Blazhev Andrey , Bruce Alison , Cederwall Bo , Chishti Muhammad M. R. , Cortes Martha L. , Crespi Fabio , Dobon Jose J. , Doncel Maria , Ertoprak Aysegül , Esmaylzadeh Arwin , Expósito Marcos L. , Fraile Luis M. , García Jaime B. , Gottardo Andrea , Ha Jeongsu , Jazrawi Shaheen , John Philipp R. , Jones Calum , Karayonchev Vasil , Kern Ralph , Knafla Lukas , Kosir Gregor , Lozeva Radomira , Mengoni Daniele , Mertzimekis Theo J. , Million Bénédicte , Morales Anabel , Murias Javier R. , Orrigo Sonja E. A. , Pellumaj Julgen , Pelonis Stefanos , Petrović Jana , Pigliapoco Sara , Quintana Begoña , Recchia Francesco , Rezynkina Kseniia , Sexton Lewis , Singh Nara , Söderström Pär-Anders , Sood Arshiya , Vasileiou Polytimos , Vesic Jelena , Wiederhold Johannes , zhang guangxin , Zidarova Radostina , Zyriliou Aikaterini
Published: December 2023

Isomeric states of the neutron-rich isotope 18973Ta116 were populated via fragmentation of a primary beam of 208Pb ions at 1 GeV/u impinging on a 9Be target at GSI, Darmstadt, Germany. The isotopes of interest were separated, identified and delivered to the DESPEC setup. Two isomers were deduced in 189Ta116 and their lifetimes were measured based on the γ-ray time distributions.
Reaction studies with neutron-rich light nuclei at the upgraded SEC Device: Exploring the excited structure of 11Li
Authors: Fernandez Ruiz D. , Tengblad O. , Borge M.J.G. , Fynbo H.O.U. , Riisager K.
Published: December 2023

The 11Li nucleus is considered the best example of a two-neutron halo nucleus. While the structure of the ground state is well established there is still a significant debate regarding its excited states despite of the multiple experiments realised mainly from the excitation of the ground state of 11Li that is rather complex. We propose a novel approach, to directly feed the different excited states of 11Li by the (t,p) reaction as 9Li has a simpler structure. We will employ a 9Li beam produced at ISOLDE and post-accelerated by HIE-ISOLDE to energies of 7 MeV/u to impinge on a 3H-target located at the upgraded SEC station, this station contains a new particle detection set up: composed of 5 Si-particle telescopes in a pentagon configuration with end caps consisting of 2 CD Si detectors downstream and 1 CD upstream has been prepared to offer the maximum angular coverage and resolution. Geant4 Monte Carlo simulations with the efficiency of the setup is presented in the following proceeding.
Collective excitations in even-even nuclei with a stepped inﬁnite square well potential
Authors: Budaca Andreea-Ioana , Budaca Radu
Published: December 2023

A solution is worked out for a γ-unstable Bohr Hamiltonian with an inﬁnite square well potential having an adjustable step. The evolution of the model’s spectral characteristics are investigated with varying height and width of the additional step, revealing shape coexisting an mixing features. The description of the dynamical shape phase transition in the collective bands of the Te even-even nuclei is oﬀered as a numerical application.
Fission studies in inverse kinematics with the R3B setup
Authors: Graña-González A. , Rodríguez-Sánchez J.L. , Benlliure J. , García-Jiménez G. , Alvarez-Pol H. , Cortina-Gil D. , Atar L. , Audouin L. , Authelet G. , Besteiro A. , Blanchon G. , Boretzky K. , Borge M.J.G. , Cabanelas P. , Casarejos E. , Cederkall J. , Chatillon A. , Corsi A. , Feijoo M. , De Filippo E. , Galaviz D. , Gasparic I. , Geraci E. , Gernhäuser R. , Gnoffo B. , Heil M. , Heinz A. , Hensel T. , Holl M. , Jelavic Malenica D. , Jenegger T. , Ji L. , Johansson H. , Kiselev O.A. , Klenze P. , Knyazev A. , Körper D. , Kröll T. , Lihtar I. , Litvinov Y. , Löher B. , Martorana N.S. , Morfouace P. , Mücher D. , Murillo Morales S. , Obertelli A. , Panin V. , Park J. , Paschalis S. , Perea A. , Petri M. , Pirrone S. , Ponnath L. , Revel A. , Rhee H.-B. , Rose L. , Rossi D.M. , Russotto P. , Simon H. , Stott A. , Sun Y. , Sürder C. , Taïeb J. , Taniuchi R. , Tengblad O. , Törnqvist H.T. , Trimarchi M. , Velardita S. , Vesic J. , Voss B. ,   the R³B Collaboration
Published: December 2023

Nuclear fission is a complex dynamical process, whose description involves the coupling between intrinsic and collective degrees of freedom, as well as different quantum-mechanical phenomena. For this reason, to this day it still lacks a satisfactory and complete microscopic description. In addition to the importance of describing fission itself, studies of the r-process in astrophysics depend on fission observables to constrain the theoretical models that explain the isotopic abundances in the Universe. To improve on the existing data, fission reactions of heavy nuclei in inverse kinematics are produced in quasi-free (p,2p) scattering reactions, which induce fission through particle-hole excitations that can range from few to tens of MeV. In order to study the evolution of the fission yields with temperature, the excitation energy of the fissioning system must be reconstructed, which is possible by measuring the four-momenta of the two outgoing protons. Performing this kind of experiment requires a complex experimental setup, providing full isotopic identification of both fission fragments and an accurate measurement of the momenta of the two outgoing protons. This was realized recently at the GSI/FAIR facility and some of the results obtained for the charge distributions are presented in this work.
β-delayed neutron spectroscopy of 85,86As with MONSTER
Authors: Pérez de Rada A. , Cano-Ott D. , Martínez T. , Alcayne V. , Mendoza E. , Plaza J. , Sanchez-Caballero A. , Villamarín D. , Äystö J. , Jokinen A. , Kankainen A. , Penttilä H. , Rinta-Antila S. , Agramunt J. , Algora A. , Domingo-Pardo C. , Lerendegui-Marco J. , Taín J.L. , Banerjee K. , Bhattacharya C. , Roy P. , Calviño F. , Cortés G. , Delafosse C. , Matea I. , Benito J. , Alhomaidhi S. , Mistry A.K.
Published: December 2023

The β-delayed neutron emission in the 85,86As β-decays has been measured at the IGISOL facility of the Accelerator Laboratory of the University of Jyväskylä (JYFL-ACCLAB). The complete β-decays have been studied with a complex setup that consists of a plastic scintillator, the MOdular Neutron time-of-flight SpectromeTER (MONSTER), and two types of γ-ray detectors—an HPGe clover and four LaBr3 crystals. The β-delayed neutron energy distributions have been determined by unfolding the TOF spectra with an innovative methodology based on the iterative Bayesian unfolding method and accurate Monte Carlo simulations.
Populating α-unbound states in 16O via 19F (p, αy)16O reaction
Authors: Távora V.G. , Tengblad O. , Borge M.J.G. , Briz J.A. , Fernandez Ruiz D. , Jensen E.A.M. , Nerio A.N. , Perea A.
Published: December 2023

The 12C(α, y)16O reaction is important in the production of universal 16O, but its cross-section at the relevant energies of static helium burning is complex and uncertain. The total cross-section originates from a sum of resonance tails and direct captures, making the contributions of sub-threshold states difficult to estimate. One proposed method to estimate these contributions involves determining relevant reduced α-widths of the sub-threshold states through indirect measurements. Therefore, 19F(p, αy)16O reaction was used to populate α-unbound states in 16O using a 2.6 MeV proton beam on a CaF2 target. A detection system consisting of single and telescope configurations of Si detectors was used to detect 2α-particles and a 12C particle in coincidence. Scintillator detectors were included in the setup to study the de-excitation of the states populated in 16O to the ground state. Under good event conditions a preliminar indentification of the particles detected has been conducted.
Study of strange particle pT spectra in heavy-ion collisions at relativistic energies
Authors: Ristea Oana , Ristea Catalin , Jipa Alexandru , Calin Marius , Esanu Tiberiu
Published: December 2023

The transverse momentum distributions of strange and multi-strange hadrons produced in most central Au+Au collisions at RHIC-BES energies were studied using the Boltzmann-Gibbs blast-wave model. The energy dependence of the kinetic freeze-out parameters is presented and discussed.
Retracted Article: Constraining Neutron-Star Matter — Combination of heavy-ion experiments, astronomy and theory
Authors: Le Fèvre Arnaud , Huth Sabrina , Pang Peter T.H. , Tews Ingo , Dietrich Tim , Schwenk Achim , Trautmann Wolfgang , Agarwal Kshitij , Bulla Mattia , Coughlin Michael W. , Van Den Broeck Chris
Published: December 2023

This paper has been formally retracted because it has been accidentally published twice in the same volume. Request approved by the proceedings Editor and the Publisher on January 29, 2024.
Scientific programme at the Laser Laboratory for Acceleration and Applications
Authors: Alejo Aarón , Benlliure José
Published: December 2023

In recent years, laser-driven accelerators have emerged as a promising technology for the development of compact and cost-effective sources of high-energy particles and radiation. Here, we introduce our research programme at the Laser Laboratory for Acceleration and Applications, which focusses on high-power laser systems, development of high-repetition rate targetry, and biomedical applications of laser-based accelerators. Our recent results include the generation of high-energy proton and ion beams through laser-plasma acceleration, which have potential applications in materials activation for medical imaging. We have also investigated the feasibility of using laser-driven X-rays and ion beams for radiobiological research, including FLASH therapy and hadron therapy.
Search for D-D Fusion initiated by Nuclear Hotspots in Boranes
Authors: Priesmeyer Hans Georg , Cazalas Edward
Published: December 2023

In the group of boron hydrogen compounds, decaborane and aminoborane belong to those with a particularly high hydrogen density in the molecular volume. Almost 100% of the protons in the molecule can be replaced by deuterons. In the element boron, the isotope 10B is 19.9% naturally present. By capturing thermal neutrons in this isotope, the high-energy reaction products 4He and 7Li are formed. It thus forms a hotspot in a spatially stable cloud of deuterium nuclei, which can be triggered by external action and whose energy could be transferred to deuterium in a similar way to neutral beam injection, a successful method to heat a fusion plasma.
Radiotracers for the study of Marine and Oceanic Ecosystems
Authors: Nácher E. , Rubio B. , Balibrea J. , Ladarescu I. , Lerendegui-Marco J. , Martínez M. , Sánchez L. , García- Párraga D. , Crespo-Picazo J. L. , Roche M. , Tomás C. , de Angelis G.
Published: December 2023

Acidification of the oceans influences the physiology of aquatic organisms and, in general, the ecology of marine ecosystems. Here we report on the first stage of the REMO project, focused on the study of marine species especially affected by acidification of waters, using radiotracers and nuclear instrumentation techniques.
Interfering reaction channels observed in the 2H(8He,4He)6H reaction studies
Authors: Muzalevskii I.A. , Bezbakh A.A. , Nikolskii E.Yu. , Chudoba V. , Abakumov A.M. , Krupko S.A. , Belogurov S.G. , Biare D. , Fomichev A.S. , Gazeeva E.M. , Gorshkov A.V. , Grigorenko L.V. , Kaminski G. , Kiselev O. , Kostyleva D.A. , Mauyey B. , Mukha I. , Quynh A.M. , Sidorchuk S.I. , Shulgina N.B. , Slepnev R.S. , Swiercz A. , Ter-Akopian G.M. , Wolski R. , Zhukov M.V.
Published: December 2023

In the recent work [Nikolskii et al., Phys. Rev. C 105, 064605 (2022)] the 2H(8He,4He)6H reaction was used for the study of the extreme neutron-rich 6H isotope. A broad bump was observed in the measured 6H spectrum interpreted as the broad overlapping ground and some low-lying states of this nuclide. There could be certain doubts in the interpretation of this work: in conditions of the limited phase space it is not impossible that the structure in the missing mass spectrum of 6H is actually induced by the resonant states populated by some other channels opened in the 8He+2H interaction. This work provides a body of the evidence for the correct channel identification and for the absence of the 6H resonances at energy ET = 0 − 3.5 MeV above the 3H+3n decay threshold. In addition the first strong experimental evidence is given that the 6H → 5H*+n → 3H+3n sequential decay is the dominating 6H decay channel.
Carbon related background estimation in the deuteron breakup reaction
Authors: Włoch Bogusław , Ciepał Izabela , Kulessa Pawel , Kozela Adam , Łukasik Jerzy , Parol Wiktor , Pawłowski Piotr , Podwysocka Aleksandra , Prędota Michał , Skwira-Chalot Izabela , Sowicki Bogdan , Ziębliński Mirosław
Published: December 2023

An experiment devoted to studies of relativistic eﬀects in the proton-deuteron breakup reaction has been performed at Cyclotron Center Bronowice in Kraków, Poland, with the use of the Kratta detectors and a deuterated polyethylene target (CD2). One of the main sources of background are reactions on carbon. They need to be subtracted from the measured spectra to obtain pure proton-deuteron breakup cross section. In order to determine this component, an additional measurement was carried out using a target made of natural graphite. A procedure of the background subtraction is discussed.
A new experiment on 19F(p,α)16O reaction at low energies
Authors: Redigolo Luigi , Lombardo Ivano , Dell’Aquila Daniele
Published: December 2023

19F(p,α) reactions are important both in nuclear astrophysical field and for the study of the inner structure and the cluster behaviour in light nuclei. The available cross section data on such reaction, although being in reasonable agreement over a wide energy range, still show some discrepancies for both α0 and απ channels. In this work we discuss the preliminary results of a new experiment aimed to solve the disagreement around 1.6 MeV for the 19F(p,α0) absolute cross section. The excellent resolution of the detection device allowed us also to resolve the απ peak in the spectra obtained in the 1.0-1.5 MeV beam energy range, where very few data where previously reported in the literature.
Neutrino oscillation anomalies
Authors: Ternes Christoph Andreas
Published: December 2023

I give an overview of some of the several anomalies appearing in neutrino oscillation experiments, setting particular focus to the reactor antineutrino anomaly and the Gallium anomaly. I will discuss these two anomalies in some detail and, in particular, compare their explanation due to neutrino oscillations in presence of a light sterile neutrino among each other and also with the bounds from the analyses of reactor spectral ratio data, β-decay data, and solar neutrino data.
The symmetric and antisymmetric phase modulation for the joint spectral amplitude of the biphotons in SPDC
Authors: Wang Jinbao , Lin Haibo
Published: December 2023

We analysis the generation of entangled biphotons by symmetric and antisymmetric phase modulation to obtain the corresponding joint spectral amplitude functions (JSAF) during the spontaneous parametric down-conversion (SPDC). With the help of Schmidt decomposition, the distribution probabilities of different modes are analyzed and the degree of entanglement is improved, which in turn leads to the effective regulation of entanglement, entropy, Schmidt coefficient and Schmidt number. Through simulations, we find that the antisymmetric phase modulation can slightly broaden the spectrum width, and the symmetric phase modulation distribution is more advantageous when the crystal is shorter.
Study on facial emotional expression induced by the annoying noise
Authors: YAN Liang , ZHOU Huiting , LI Zhengguang
Published: December 2023

Noise is annoying. Facial expressions indicate diverse emotions instantly, objectively and accurately. In this paper, the facial emotional expression is used to assess the noise annoyance to nullify the disadvantages of traditional evaluation methods. Firstly, by exploiting listening experiments, the facial videos, physiological signals and individual annoyance from 30 listeners with different nationalities were collected. Then, the facial action units (AUs) were extracted, identified and analyzed, and the AUs combination reflects annoyed emotion induced by the noise was confirmed. Furthermore, a novel evaluation scale embodying color and emotional symbols was proposed, which has been proven to be valid by the social surveys. The present study confirms that it is feasible to evaluate the noise annoyance more objectively by exploring the listener's facial "annoyance" expression. The innovative scale can avoid the understanding bias and improve the evaluation efficiency remarkably.
Numerical simulation and experimental investigation of heat transfer performance of turbine blade with ribbed channel
Authors: LI Haofan , YUN Xue
Published: December 2023

A combination of numerical simulation and experimental test is carried out, and the vortex core visualization technology is adopted to visualize vortex in the flow field and study the heat transfer mechanism. The heat transfer characteristics of air flow in 45° ribbed straight channel with aspect ratio of 1 and the other 6 new ribbed channels are studied. The results show that the average heat transfer performance of the new ribbed channel with all the fins 3.8 mm cut at the far end of fins along the flow direction is the best by comparing with the original ribbed straight channel under the same conditions. The average Nu, the average Nu/Nu0 and the average heat transfer enhancement factor FT of the ribbed wall is increased respectively by 25.1%, 24.8%, 22.7% on the average by comparing with the original ribbed channel. The experimental results show that the error between the experimental value and the simulated is about 10% for the outer wall temperature of ribbed channel.
Environmental constraints-based location optimization method for radar station
Authors: CUI Guonan , SU Jia , TAO Mingliang , FAN Yifei , WANG Ling
Published: December 2023

The complex geographical environment and electromagnetic interference environment within the radar deployment position area will seriously degrade the radar detection performance. Focusing on the urgent requirement of optimizing radar deployment in complex geographic and electromagnetic environments, the environment-constrained radar position positioning optimization method is investigated. Firstly, based on the terrain and electromagnetic interference environment of radar positions, a radar position selection method under both geographic and electromagnetic environment constraints is established. Then the propagation loss under complex geographical terrain is calculated by combining the radar equations, and the detection power of target height layer and the coverage power of the focused area are used as the evaluation indicators for the superiority of radar sites. Finally, the detection range of the radar under multiple environmental constraints is visualized. The problem of complex radar operational scenarios in real systems and the single constraint considered in traditional radar equipment deployment methods is addressed. By calculating the propagation loss, terrain loss, electromagnetic loss under multiple environmental and electromagnetic constraints, and adding actual elevation and terrain data as reference, a more realistic and objective analysis of the impact of the environment around the position on the performance of radar equipment is provided, and finally the evaluation indexes and selection methods is proposed in this paper. The proposed evaluation indexes and selection methods and visualization can provide accurate, reliable and intuitive strategies for optimizing the deployment of radar equipment under multiple constraints.
Effect of oxygen-enriched on the combustion characteristics of cartons under high plateau
Authors: MA Junhao , TANG Jing , ZHANG Xiaoyu , DAI Shangpei , XU Songtao , LI Shouqing , JIA Xuhong
Published: December 2023

Artificial oxygenation facilities are installed in the high altitude airport living areas, and the fire behaviors of solid materials will change significantly under low-pressure with oxygen-enriched. The influence law of pressure and oxygen concentration on solid combustion rate was deduced from the perspective of heat and mass transfer. Carton fire experiments were carried out in the self-designed low-pressure oxygen-enriched chamber to measure parameters such as mass combustion rate, flame morphology and flame temperature during the combustion process, with a view to providing some basis for indoor fire safety in high plateau airports. The results showed that the relationship between the rate of combustion of carton and the pressure and oxygen concentration is [see formula in PDF], and the empirical formula is obtained through experimental results. At 60 kPa, as the oxygen concentration increased from 21% to 33%, the heat release rate grew by 63.56%, the total heat production increased by 8%, and the maximum flame temperature increased by 19%. Furthermore, flame shape had a thin high type into a wide low type, the color had a blue-yellow gradually turned into a bright color. The inhibition of carton combustion by low pressure can be significantly weakened by oxygen enrichment and the fire hazard increases. In addition, pressure was weakly correlated with mass loss and heat production at high oxygen concentration.
Quantifying and eliminating the time delay in stabilization exponential time differencing Runge–Kutta schemes for the Allen–Cahn equation
Authors: Zhang Hong , Liu Lele , Qian Xu , Song Songhe
Published: December 2023

Although the stabilization technique is favorable in designing unconditionally energy stable or maximum-principle-preserving schemes for gradient flow systems, the induced time delay is intractable in computations. In this paper, we propose a class of delay-free stabilization schemes for the Allen–Cahn gradient flow system. Considering the Fourier pseudo-spectral spatial discretization for the Allen–Cahn equation with either the polynomial or the logarithmic potential, we establish a semi-discrete, mesh-dependent maximum principle by adopting a stabilization technique. To unconditionally preserve the mesh-dependent maximum principle and energy stability, we investigate a family of exponential time differencing Runge–Kutta (ETDRK) integrators up to the second-order. After reformulating the ETDRK schemes as a class of parametric Runge–Kutta integrators, we quantify the lagging effect brought by stabilization, and eliminate delayed convergence using a relaxation technique. The temporal error estimate of the relaxation ETDRK integrators in the maximum norm topology is analyzed under a fixed spatial mesh. Numerical experiments demonstrate the delay-free and structure-preserving properties of the proposed schemes.
Prevalência de ausência de tendão palmaris longus em uma amostra populacional de uma cidade brasileira multiétnica*
Authors: Kitagaki Danilo Pizzo , Fernandes Carlos Henrique , Meirelles Lia Miyamoto , Nakachima Luis Renato , Santos João Baptista Gomes dos , Faloppa Flávio
Published: December 2023

Objetivo O objetivo do presente estudo foi determinar a prevalência de ausência de tendão palmaris longus em uma amostra populacional de uma cidade multiétnica brasileira.

Métodos Um estudo observacional transversal foi realizado entre outubro de 2017 e abril de 2018. Incluímos voluntários dos sexos masculino e feminino com 18 anos ou mais. A ausência do tendão palmaris longus foi determinada pedindo aos voluntários que realizassem o teste de Schaeffer bilateralmente.

Resultados Foram coletados prospectivamente dados de 1.008 voluntários, 531 homens e 477 mulheres, com idade entre 18 e 74 anos (média de 38,4 anos). A ausência do tendão palmaris longus foi observada em 264 (26,2%) voluntários. A ausência bilateral foi detectada em 123 voluntários (12,2%), 60 mulheres (48,8%) e 63 homens (51,2%). A ausência unilateral foi encontrada em 141 pacientes (14,0%), 54 mulheres (38,2%) e 87 homens (61,8%) (p < 0,05).

Conclusão A prevalência de ausência do tendão palmaris longus em nosso estudo foi de 26,2%. Não houve diferença estatisticamente significativa bilateralmente e entre gêneros. A ausência do tendão palmaris longus foi predominante no lado direito unilateral no sexo masculino.
Falha óssea na glenoide – Uma avaliação retrospectiva dos desfechos funcionais após cirurgia de bloqueio ósseo para instabilidade anterior do ombro em atletas de alta demanda
Authors: Lara Paulo Henrique Schmidt , Gonçalves Gabriel Massarico , Zobiole Alexandre Figueiredo , Silva Eli Henrique Rodrigues da , Ejnisman Benno , Belangero Paulo Santoro
Published: December 2023

Objetivo Avaliar a relação do tamanho do defeito ósseo da glenoide no arco de movimento, nos resultados funcionais e nas complicações em pacientes atletas de alta performance submetidos a cirurgia de bloqueio ósseo para instabilidade anterior do ombro.

Método Estudo retrospectivo no qual foram avaliados os resultados pós-operatórios de atletas submetidos a cirurgia de bloqueio ósseo para instabilidade anterior do ombro. Em 5 anos foram 41 ombros operados, sendo 20 deles com até 15% de defeito ósseo e 21 com defeitos entre 15% e 25%.

Resultados Não houve diferença estatisticamente significativa com relação a complicações pós-operatórias, novas luxações, e na taxa de retorno ao esporte. Os critérios quantitativos avaliados – arcos de movimento e escores funcionais – também não apresentaram diferença estatisticamente significativa entre os grupos.

Conclusão O tamanho do defeito ósseo por si só não parece afetar os resultados funcionais e as complicações desses procedimentos, sendo uma técnica segura tanto para defeitos pequenos, quanto para os maiores.
Versão brasileira da classificação funcional de mielomeningocele (MMFC): Tradução, adaptação cultural e propriedades psicométricas
Authors: Tedesco Ana Paula , Dias Luciano , Nicolini-Panisson Renata D'Agostini
Published: December 2023

Objetivo: Realizar a tradução e adaptação cultural da Classificação Funcional da Mielomeningocele (MMFC) para o português (Brasil) e estudar suas propriedades psicométricas.

Método: Estudo de validação com tradução, adaptação cultural e avaliação das propriedades psicométricas: confiabilidade, teste-reteste e validade convergente. Amostra de 20 indivíduos com mielomeningocele e idade mediana de 10 (5 a 24,25) anos, com mínimo de 3 e máximo de 66 anos. A confiabilidade foi determinada pela concordância intra e interobservador, utilizando os resultados do coeficiente de correlação intraclasse (ICC) e o intervalo de confiança de 95% (IC - 95%). A validade convergente foi realizada por meio das classificações de Sharrard, Hoffer, Inventário de Avaliação Pediátrica de Incapacidade (Pediatric Evaluation of Disability Inventory [PEDI]) e Escala de Mobilidade Funcional (Functional Mobility Scale [FMS]). Além disso, o teste de correlação de Spearman foi realizado.

Resultados: A confiabilidade intraobservador (ICC: 0,900-1,0) e interobservador (ICC: 0,936; IC - 95%: 0,839-0,975) apresentou excelentes níveis de ICC. A validade convergente mostrou correlações muito fortes com FMS-5 (r = 0,94, p = 0,00) e FMS-50 (r = 0,94, p = 0,00); correlações fortes com FMS-500 (r = 0,87, p = 0,00), Sharrard (r = 0,76, p = 0,00), Hoffer (r = 0,83, p = 0,00) e Habilidades Funcionais: Mobilidade (PEDI) (r = 0,84, p = 0,00) e Assistência do Cuidador: Mobilidade (PEDI) (r = 0,77, p = 0,00); e fracas com o domínio autocuidado de PEDI (r = 0,46, p = 0,04). O teste-reteste revelou que ICC = 1,00.

Conclusões: Este estudo apresenta as propriedades psicométricas da MMFC, além de sua tradução e adaptação cultural para o português, língua nativa do autor da classificação. A MMFC demonstra correlação com classificações de mielomeningocele anteriormente utilizada. A MMFC teve bons resultados nas propriedades psicométricas avaliadas. Assim, a MMFC parece adequada e aplicável a indivíduos com mielomeningocele e é válida para a população brasileira.
Controle de sangramento em pacientes com escoliose idiopática submetidos a artrodese da coluna: Avaliação prospectiva de uma coorte de pacientes
Authors: Morais Sebastião Vieira de , Araújo Anderson Matheus Medeiros de , Sousa Camila Costa Lacerda de
Published: December 2023

Objetivo O objetivo deste estudo é identificar os fatores de risco para o aumento de sangramento perioperatório em cirurgias para tratamento de escoliose.

Métodos Estudo de coorte prospectivo incluindo 30 pacientes com escoliose idiopática submetidos à instrumentação posterior com o uso do sistema de parafusos pediculares em um hospital universitário.

Resultados As perdas sanguíneas intraoperatórias totalizaram 798,6 ml ± 340 ml (24,8% do volume sanguíneo). Houve perda maciça de sangue em 9 pacientes. Em média, a hemoglobina caiu 3,7 g/dl e foram transfundidas 1,4 bolsas de sangue por paciente. A perda sanguínea pós-operatória foi de 693,4 ml ± 331,1ml, e o total de dias utilizando dreno foi 2,7 ± 0,7. No intraoperatório, as seguintes variáveis apresentaram correlações significativas (p < 0,05) com o aumento do sangramento: idade, intervalo entre diagnóstico e tratamento, Cobb pré-operatório, quantidade de correção da curva, número de níveis instrumentados e fixados, número total de parafusos e o número de bolsas transfundidas. No pós-operatório, as seguintes variáveis apresentaram relação (p < 0,05): idade, Cobb pré-operatório, tempo de internação, quantidade de bolsas de sangue transfundidas e o número de níveis fixados com parafuso.

Conclusão As variáveis que mais contribuíram para a perda sanguínea foram idade, Cobb pré-operatório, quantidade de bolsas de sangue transfundidas e número de níveis fixados com parafuso. Portanto, os pacientes podem se beneficiar do tratamento cirúrgico enquanto mais jovens e com menor ângulo de Cobb, consequentemente, exigindo menor grau correção da curva e a utilização de implantes de menor densidade.
Cirurgia toracoscópica na abordagem da escoliose idiopática: Revisão sistemática de literatura
Authors: Aziz Rodrigo Ibrahim , Blattes Juliano Boemo
Published: December 2023

A escoliose idiopática é caracterizada por um quadro de deformidade tridimensional da coluna vertebral com rotação axial e inclinação lateral com angulação maior que 10° segundo o Método de Cobb. Sua abordagem pode se dar de maneira conservadora ou cirúrgica, a depender do grau de angulação, desenvolvimento osteomuscular e idade da criança ou adolescente acometido, ou ainda, a depender do comprometimento funcional advindo da condição. O objetivo deste estudo foi analisar o impacto da videotoracoscopia na abordagem da escoliose idiopática. Trata-se de uma revisão sistemática de literatura, construída conforme protocolo Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) e registrada no PROSPERO sob número CRD42022351466. A busca por estudos foi realizada entre agosto de 2022 e setembro do mesmo ano, em bancos de dados bibliográficos incluindo MEDLINE, The Cochrane Library e Web of Science. A técnica é uma alternativa minimamente invasiva à toracotomia que apresentou grande evolução nos últimos anos. Destacam-se como principais vantagens a menor perda sanguínea durante procedimento, menor tempo de internação e melhora da estética pós-cirúrgica. Uma das desvantagens citadas pelos autores é a maior complexidade e exigência tecnológica, maior tempo cirúrgico e necessidade de seleção criteriosa dos pacientes, conforme graus de desvio vertebral. O uso de analgésicos e anti-inflamatórios não teve diferença significativa entre os procedimentos tradicionais (toracotomia) ou videotoracoscopia.
Acurácia do bloqueio dos nervos pericapsulares (PENG) do quadril sem auxílio de ultrassonografia em pacientes com dor no quadril
Authors: Polesello Giancarlo Cavalli , Saú André Sanches , Rudelli Marco , Junior Walter Ricioli , Rabelo Nayra Deise dos Anjos
Published: December 2023

Objetivo Descrever e avaliar a acurácia da técnica do bloqueio PENG realizado sem auxílio de ultrassonografia.

Método Série de 40 infiltrações em pacientes com dor no quadril, em acompanhamento ambulatorial no grupo de cirurgia do quadril ou admitidos no pronto atendimento de um hospital na cidade de São Paulo. Utilizada a técnica de bloqueio nervoso pericapsular do quadril (PENG) guiado por estruturas anatômicas palpáveis da pelve e sem auxílio de ultrassonografia no posicionamento da agulha, usando o aparelho apenas para conferência da localização correta após punção não guiada.

Resultados Nos 40 quadris infiltrados em 35 pacientes com idade média de 59,2 anos, obtivemos um índice de acerto de 85%. Dos casos mal posicionados 71,4% ocorreram nas primeiras 13 aplicações e 28,6% nas 27 aplicações subsequentes. Em todos os pacientes o feixe neurovascular estava situado no terço medial da marcação realizada à caneta e mesmo nos casos em que houve falha da localização da agulha havia distância segura ao feixe neurovascular. Obtivemos apenas 1 caso de efeito adverso, onde ocorreu apraxia do nervo femoral com melhora espontânea em 2 dias.

Conclusão O bloqueio PENG não guiado é uma técnica viável e pode ser realizada por um médico que já possui conhecimento na aplicação, em serviços onde não haja disponibilidade do aparelho de ultrassonografia.
Umwelt as the foundation of an ethics of smart environments
Authors: Lecomte Patrick
Published: December 2023

Due to the increasing embeddedness of pervasive and immersive technologies in the built environment, a new type of spaces known as smart environments emerges. With them arise many ethical issues related to freedom, agency, consciousness, and the governance of human-machine interactions. In this paper, I use Jakob von Uexküll’s Umwelt theory to devise principles for an applied ethics of umwelt, as part of a broader ethics of smart environments. Umwelt ethics is one of human beings’ surrounding world in the context of environmental capitalism. As umwelt becomes a resource to be exploited by economic agents with de facto or de jure rights to control space, defining ethical principles pertaining to the digitalization of space in the built environment is more important than ever.
Uniaxial tensile mechanical behavior research of HTPB propellant under wide temperature and confining pressure
Authors: Li Chuntao , Li Haiyang , Wu Weijing , Li Wei , Pang Aimin
Published: December 2023

To investigate the effects of confining pressure, strain rates, and temperatures on the mechanical properties of the Hydroxyl-terminated Polybutadiene (HTPB) propellant, uniaxial tensile tests were performed utilizing wide-temperature-confining pressure systems. The resulting damage was subsequently analyzed and characterized through scanning electron microscopy and mirco-ct. The results indicate that the stress–strain curves of HTPB at 20 and 70 °C are comparable, and the propellant damage is primarily attributed to de-wetting at 20 and 70 °C with respect to the mechanism. At −50 °C, the maximum tensile strength and ultimate tensile strain at 8 MPa surpass those at 0 and 2 MPa to a significant degree and the damage shifts from de-wetting and ductile fracture of particles to severe particle breakage with the elevated confining pressure. Ultimately, the primary curve of the HTPB propellant's maximum tensile strength was constructed by the curve fitting analysis based on the time–temperature equivalent superposition principle (TTSP) and time–pressure equivalent superposition principle (TPSP). Comparing to the properties of TPSP, TTSP exhibits a wider range of applicability and greater fitting precision in relation to the HTPB propellant. This study mainly serves to establish a fundamental theory and furnish data support for the enhancement of mechanical properties and structural integrity of solid rocket motors.