bluuebunny/crossref_metadata_2025 huggingface dataset:
Deep-learning-based precise characterization of microwave transistors using fully-automated regression surrogates
Authors: Calik Nurullah , Güneş Filiz , Koziel Slawomir , Pietrenko-Dabrowska Anna , Belen Mehmet A. , Mahouti Peyman
Published: January 2023

Accurate models of scattering and noise parameters of transistors are instrumental in facilitating design procedures of microwave devices such as low-noise amplifiers. Yet, data-driven modeling of transistors is a challenging endeavor due to complex relationships between transistor characteristics and its designable parameters, biasing conditions, and frequency. Artificial neural network (ANN)-based methods, including deep learning (DL), have been found suitable for this task by capitalizing on their flexibility and generality. Yet, rendering reliable transistor surrogates is hindered by a number of issues such as the need for finding good match between the input data and the network architecture and hyperparameters (number and sizes of layers, activation functions, data pre-processing methods), possible overtraining, etc. This work proposes a novel methodology, referred to as Fully Adaptive Regression Model (FARM), where all network components and processing functions are automatically determined through Tree Parzen Estimator. Our technique is comprehensively validated using three examples of microwave transistors and demonstrated to offer a competitive edge over the state-of-the-art methods in terms of modeling accuracy and handling the aforementioned issues pertinent to standard ANN-based surrogates.
Anthropogenic interventions on land neutrality in a critically vulnerable estuarine island ecosystem: a case of Munro Island (India)
Authors: Rafeeque M. K. , Anoop T. R. , Sreeraj M. K. , Prasad R. , Sheela Nair L. , Krishnakumar A.
Published: January 2023

All landscapes, including estuarine islands, normally try to restore their geomorphic isostasy in all anthropogenic interventions on land dynamics. Munroe Island has been experiencing drastic environmental degradation, such as land subsidence, severe tidal/monsoon flooding, subsidence of build-ups and a drastic decay in agricultural productivity. This paper examines the role of anthropo-geomorphic interventions causing for the land degradation in Munroe Island through a multidisciplinary approach. Multidated, multiresolution satellite products and published maps, spanning a period of about six decades from 1960 to 2021, were used to understand the different geomorphic and geographical processes in the study area. Evaluation of the temporal bathymetric datasets, salinity measurements of the river and estuary, borehole data logs of the area and electrical resistivity surveys of the island were analyzed to find out the causative factors for the disturbances in the land neutrality, along with the tidal hydrodynamic changes in the region. The study shows about 14% of the total land area was vanished during the study period, and more than 25% of the area is under stress, leading to further land degradation. More than 500 households are forced to vacate their residence due to land subsidence/flooding. Lack of required freshwater and sediment supply from the Kallada river after the construction of the Thenmala reservoir in the Kallada river as well as the uncontrolled sand mining prevailed are the key factors for the environmental degradation of Munroe Island. The paper describes the role and colinkages of human-induced hydrogeomorphic interventions on a geomorphic system, in charge of the environmental degradation and land subsidence crisis of an estuarine island ecosystem and discusses the concerns related to the management strategies of such region.
Galectin-3 as an important prognostic marker for COVID-19 severity
Authors: Gajovic Nevena , Markovic Sofija Sekulic , Jurisevic Milena , Jovanovic Marina , Arsenijevic Nebojsa , Mijailovic Zeljko , Jovanovic Marina , Jovanovic Ivan
Published: January 2023

Galectin-3 (Gal-3), multifunctional protein plays important roles in inflammatory response, infection and fibrosis. The goal of study was to determine the association of Gal-3, immune response, clinical, biochemical, and radiographic findings with COVID-19 severity. Study included 280 COVID-19 patients classified according to disease severity into mild, moderate, severe and critical group. Cytokines, clinical, biochemical, radiographic data and peripheral blood immune cell make up were analyzed. Patients in critical group had significantly higher serum level of Gal-3, IL-1β, TNF-α, IL-12, IL-10 compared to the patients in less severe stages of disease. Strong positive correlation was detected between Gal-3 and IL-1β, moderate positive correlation between Gal-3, TNF-α and IL-12, moderate negative correlation between Gal-3, IL-10/IL-1β and IL-10/TNF-α. Moderate positive correlation noted between Gal-3 and urea, D dimer, CXR findings. Strong negative correlation detected between Gal-3 and p02, Sa02, and moderate negative correlation between Gal-3, lymphocyte and monocyte percentage. In the peripheral blood of patients with more severe stages of COVID-19 we detected significantly increased percentages of CD56− CD3+TNF-α+T cells and CD56− CD3+Gal-3+T cells and increased expression of CCR5 in PBMCs. Our results predict Gal-3 as an important marker for critical stage of COVID-19. Higher expression of Gal-3, TNF-α and CCR5 on T cells implicate on promoting inflammation and more severe form of disease.
Enhanced magmatism played a dominant role in triggering the Miocene Climatic Optimum
Authors: Goto Kosuke T. , Tejada Maria Luisa G. , Tajika Eiichi , Suzuki Katsuhiko
Published: January 2023

The Miocene Climatic Optimum represents one of the major warming events during the Cenozoic and was accompanied by a positive stable carbon isotope excursion. Here, we report seawater osmium isotope data from Pacific Ocean sediments to determine if carbon dioxide emissions from coeval magmatism could have been the trigger for this event. Our data reveal a negative osmium isotope excursion from 0.80 to 0.72 between about 17 and 15.8 million years ago that can be explained by enhanced magmatism during this period. Simple mass balance calculations suggest an increase of 22‒45% in non-radiogenic osmium input from the mantle into the ocean during this period. Using osmium isotopic composition as a constraint for global carbon cycle modelling, we find that such an increase in magmatism is capable of elevating atmospheric carbon dioxide concentrations by 65‒140 ppmv and of causing a positive excursion in seawater stable carbon isotopes of 0.4‒0.7‰, consistent with geochemical observations. We conclude that it is conceivable that the enhanced magmatism played a dominant role in causing the Miocene Climatic Optimum.
Catalytic length-controlled oligomerization with synthetic programmable templates
Authors: Lewandowski Bartosz M. , Schmid Dario , Borrmann Rüdiger , Zetschok Dominik , Schnurr Martin , Wennemers Helma
Published: January 2023

Nature uses templated length-controlled oligomerization to process genetic information. Templates that are DNA and RNA based and fully synthetic have also been developed for preparing unnatural oligomers. However, these reactions require stoichiometric amounts of the template for product formation. Here we report a catalytic macrocyclic template that promotes the oligomerization of a small-molecule substrate with a remarkable degree of length control. The design of the template is based on rigid oligoproline moieties decorated with catalytic sites in a defined spatial arrangement. The dimension of the macrocycle and the number of catalytic moieties determine the number of monomers that are incorporated into the growing oligomer, thus allowing access to specific products with lengths preprogrammed by the template.
Absorption rate governs cell transduction in dry macroporous scaffolds
Authors: VanBlunk Madelyn , Srikanth Vishal , Pandit Sharda S. , Kuznetsov Andrey V. , Brudno Yevgeny
Published: January 2023

Dry, macroporous scaffolds efficiently transduce T cells, but the mechanism for this transduction has not been studied previously. We report that liquid volume and resultant differences in liquid absorption rates governs cell transduction efficiency.
Facile fabrication of two-dimensional iodine nanosheets for antibacterial therapy
Authors: Ye Yingmin , Wang Yanmin , Zhang Kai , Guo Wei , Kong Tianyu , Ding Xiaokang , Zhao Nana , Xu Fujian
Published: January 2023

Herein, we report a facile approach for the preparation of two-dimensional iodine nanosheets (2D iodine NSs) with good stability and high biocompatibility via an aqueous solvent-assisted ultrasonic route.
An indolo[3,2,1-jk]carbazole-fused multiple resonance-induced thermally activated delayed fluorescence emitter for an efficient narrowband OLED
Authors: Luo Xu-Feng , Ni Hua-Xiu , Shen Liangjun , Wang Lejia , Xiao Xunwen , Zheng You-Xuan
Published: January 2023

An efficient indolo[3,2,1-jk]carbazole-fused MR-TADF emitter with a B/N skeleton exhibits a considerable reverse intersystem crossing rate and the corresponding organic light-emitting diode displays an external quantum efficiency of 27.2% with suppressed efficiency roll-off.
Rational design of atomic site catalysts for electrochemical CO2reduction
Authors: Tan Xin , Zhuang Zewen , Zhang Yu , Sun Kaian , Chen Chen
Published: January 2023

This feature article summarizes the recent progress on the rational design of atomic site catalysts for electrochemical CO2reduction.
Adsorption properties of a paracyclophane molecule on NaCl/Au surfaces: a first-principles study
Authors: Xiao Jiyin , Zhao Wenjing , Li Li , Ma Liang , Tian Guangjun
Published: January 2023

Theoretical simulation indicates that three layers of insulating NaCl layers is sufficient to decouple a double-decker 3,3-paracyclophane molecule from Au(111) surface to preserve the intrinsic properties of the molecule.
Theoretical insight of origin of Rashba–Dresselhaus effect in tetragonal and rhombohedral phases of BiFeO3
Authors: Ahmad Tahir , Jindal Kajal , Tomar Monika , Jha Pradip K.
Published: January 2023

The inclusion of the spin–orbit coupling effect in ferroelectric materials with non-centrosymmetry leads to intriguing properties for spintronic applications.
Structural evolution and mechanical stabilities of head-to-side nanowelding of Cu–Ag bimetallic nanowires via atomistic simulations
Authors: Fang Ranran , Li Zhentao , Guo Lijuan , Li Hui
Published: January 2023

The intersection of head-to-side cold welding of Cu–Ag core–shell nanowires exerts a great influence on the deformation mechanism of joined nanowires.
Impacts of iron rust particle and weak alkalinity on surfactant micelle structure and drag reduction ability
Authors: Xu Na , Liu Zilu , Liu Fei , Hong Wei
Published: January 2023

Both impacts of weak alkalinity and iron rust on micelle structure impair the surfactant drag reduction ability. Adding an acidic neutralizing agent and excess counter-ions can eliminate the impacts of weak alkalinity and iron rust, respectively.
Water model for hydrophobic cavities: structure and energy from quantum-chemical calculations
Authors: Lanza Giuseppe
Published: January 2023

Hydrophobic solutes impose some geometrical constraints to water molecules in immediate neighbors. A first-order model of the solvent cavity shows a large molecular reorganization extending for two water molecule layers around the clathrate cages.
Enhanced Curie temperature and conductivity of van der Waals ferromagnet MgV2S4via electrostatic doping
Authors: Sun Jie , Tan Zheng , Ye Haoshen , Bai Dongmei , Wang Jianli
Published: January 2023

We propose a novel intrinsic room-temperature ferromagnetic semiconductor, the MgV2S4 monolayer, which is an ideal candidate for low-dimensional spintronic field-effect transistors.
Tunable production of elemental Se vs. H2Se through photocatalytic reduction of selenate in synthetic mine impacted brine: engineering a recoverable Se product
Authors: Holmes Andrew B. , Ngan Aldrich , Giesinger Kayleanna , Gu Frank
Published: January 2023

Photocatalytic reduction removes selenium from industrial brine through tunable reduction pathways to either Se0(s) or H2Se(g).
Disinfection of bromide-containing tryptophan water by UV/chlorine: brominated halonitromethane formation, impact factors, and pathways
Authors: Wang Tao , Deng Lin , Dai Wenjuan , Hu Jun , Prasad Singh Rajendra , Tan Chaoqun
Published: January 2023

Tryptophan was selected as the precursor for the investigation on the formation of brominated halonitromethanes (Br-HNMs) in the presence of bromide during UV/chlorine disinfection.
Biobased and degradable thiol–ene networks from levoglucosan for sustainable 3D printing
Authors: Porwal Mayuri K. , Hausladen Matthew M. , Ellison Christopher J. , Reineke Theresa M.
Published: January 2023

Family of levoglucosan-derived renewable networks via UV-initiated thiol–ene click chemistry with tailorable properties for 3D printing of hydrolytically degradable parts.
Emulating clinical pressure waveforms in cell culture using an Arduino-controlled millifluidic 3D-printed platform for 96-well plates
Authors: Szmelter Adam H. , Venturini Giulia , Abbed Rana J. , Acheampong Manny O. , Eddington David T.
Published: January 2023

Clinical pressure waveforms are introduced into cell culture using a millifluidic 3D-printed platform.
Particle alignment effects on mechanical properties of cellulose nanocrystal thin films
Authors: Son Hyeyoung , Smith Dawson Michael , Li Zhaofan , Chang Taehoo , Xia Wenjie , Davis Chelsea Simone
Published: January 2023

The fracture mechanics of cellulose nanocrystal (CNC) thin films are strongly dependent on their alignment direction relative to the loading direction.
Synergistic effects of MoS2-decorated in situ NiFe nanoalloys/NiFe-LDH with superhydrophilicity for electrocatalytic overall water splitting
Authors: Hao Minghui , Xu Zhiying , Liu Xin , Wang Liang , Li Chunhu , Wang Wentai
Published: January 2023

An electrode of MoS2/NiFe NPs/ NiFe-layered double hydroxide/CC with sandwich structure was successfully fabricated, exhibiting outstanding electrocatalytic water splitting performances and long-term stability.
Organocatalytic asymmetric Michael addition reaction of aldehydes with 2-furanones: experimental, applications and DFT studies
Authors: You Xiao , Zhu Wenning , Du Jiacheng , Liu Yuehua , Chen Fumin , Chai Yongshuai , Zhang Qiang , Pang Jingxiang , Liu Aiqin , Bai Zhushuang
Published: January 2023

Organocatalytic asymmetric Michael additions of aldehydes to 2-furanones are successfully conducted and have been applied to the synthesis of vorapaxar's analogues.
Degradation of hybrid material l,d-PLA : 5CB : SWCN under the influence of neutral, acidic, and alkaline environments
Authors: Fryń Patryk , Lalik Sebastian , Bogdanowicz Krzysztof A. , Górska Natalia , Iwan Agnieszka , Marzec Monika
Published: January 2023

We have shown that admixtures of 5CB and SWCN accelerate the degradation of l,d-PLA in the composite layer due to hydrophilic/hydrophobic interface in the layer and act as plasticizers. The mechanism of the degradation process is also discussed.
Bioactive substances inhibiting COX-2 and cancer cells isolated from the fibrous roots of Alangium chinense (Lour.) Harms
Authors: Xiao Ting , Cheng Xingyan , Huang Jiaoyan , Guo Zhenghong , Tao Ling , Shen Xiangchun
Published: January 2023

Alangium chinense has been used as a traditional folk medicine for centuries to treat rheumatism, skin diseases, and diabetes by the people of Southeast Asia.
Improvements in piezoelectric and energy harvesting properties with a slight change in depolarization temperature in modified BNKT ceramics by a simple technique
Authors: Jaita Pharatree , Saenkam Kamonporn , Rujijanagul Gobwute
Published: January 2023

In this study, we demonstrated a simple technique (thermal annealing) to enhance the piezoelectricity with a very slight decrease in Td by ∼2 °C for a modified BNKT ceramic (BNKT doped with ZnO).
Experimental and theoretical studies on the extraction behavior of Cf(iii) by NTAamide(C8) ligand and the separation of Cf(iii)/Cm(iii)
Authors: Wang Yi-lin , Li Feng-feng , Xiao Zhe , Wang Cong-zhi , Liu Yang , Shi Wei-qun , He Hui
Published: January 2023

We performed basic chemical studies on Cf using NTAamide extractant. The results of experiments and DFT calculations show that NTAamide has a good coordination ability to Cf/Cm and is expected to be applied to Cf/Cm separation.
Enzyme immobilization on a 3D-printed reactor for aldehyde oxidation to carboxylic acid under mild conditions
Authors: Nakahara Kou , T.sriwong Kotchakorn , Hawari Muhammad Arisyi , Tanaka Akira , Matsuda Tomoko
Published: January 2023

An aldehyde dehydrogenase, catalyzing the oxidation of aldehydes under mild conditions, was immobilized on a 3D-printed reactor.
A corresponding V-target lattice structure to enhance selection pressure for aptamer selection
Authors: Wang Yong-Tao , Wang Meng , Yang Ke-Zhu , Zhang Zhi-Ling
Published: January 2023

A corresponding V-lattice structure was constructed to enhance the binding process between targets and random libraries in microfluidic-SELEX.
Ultra-porous superamphiphilic aerogel enabled ultra-stable continuous separation of emulsion
Authors: Wang Yujia , Hao Baicun , Xiao Hanzhong , Cui Yiwen , Huang Xin , Shi Bi
Published: January 2023

Collagen fiber-based ultra-porous superamphiphilic aerogel enabled “non-selective permeation and selective capture” separation strategy for accomplishing an ultra-stable continuous separation of water-in-oil emulsion.
A novel strategy of constructing an artificial light-harvesting system based on a supramolecular organic framework for photocatalysis
Authors: Wang Ying , Ma Chao-Qun , Li Xin-Long , Dong Rui-Zhi , Liu Hui , Wang Rong-Zhou , Yu Shengsheng , Xing Ling-Bao
Published: January 2023

A supramolecular organic framework was fabricated through encapsulation-enhanced donor–acceptor interaction for the construction of artificial light-harvesting systems for photocatalysis.
Tumor microenvironment (TME)-modulating nanoreactor for multiply enhanced chemodynamic therapy synergized with chemotherapy, starvation, and photothermal therapy
Authors: Hao Siyuan , Zuo Jingjie , Huang Haowu , Li Wenqiu , Guo Huiling , Liu Mingxing , Zhu Hongda , Sun Hongmei
Published: January 2023

The combination of chemotherapy (CT) and chemodynamic therapy (CDT) via nanoscale drug delivery systems has great potential for tumor therapy.
Design of polyimides with targeted glass transition temperature using a graph neural network
Authors: Qiu Haoke , Qiu Xuepeng , Dai Xuemin , Sun Zhao-Yan
Published: January 2023

Models were obtained to predict the Tg of polyimides and compared with the experimental results. 110 polyimides are screened through high-throughput calculations and chemical knowledge. Novel molecular design guidelines are provided.
Recent advances in metal-free phosphorescent materials for organic light-emitting diodes
Authors: Zhou Zixing , Xie Xiaoyu , Sun Zhonglie , Wang Xiao , An Zhongfu , Huang Wei
Published: January 2023

This review discusses organic room temperature phosphorescent materials for the emitting layer of OLEDs. The existing circumstances, potential and challenges of metal-free phosphorescent OLEDs are summarized.
High-throughput synthesis of AlPO and SAPO zeolites by ink jet printing
Authors: Chen Xutao , Li Zhinian , Chen Yuang , Zou Shihui , Xiao Liping , Fan Jie
Published: January 2023

The Ink jet printing technique is successfully introduced into high-throughput AlPO and SAPO zeolite synthesis. Numerous zeolite products can be obtained relative to different precursor formulations.
Heart of gold: enabling ligands for oxidative addition of haloorganics in Au(i)/Au(iii) catalysed cross-coupling reactions
Authors: McCallum Terry
Published: January 2023

Advances in cross-coupling reactions using Au(i)/Au(iii) catalysis, forming C–C, C–N, C–O, and C–S bonds, are discussed. Enabling ligands facilitate the challenging oxidative addition of haloorganics, precluding the need for external oxidants.
Interaction of the periplasmic chaperone SurA with the inner membrane protein secretion (SEC) machinery
Authors: Troman Luca A. , Alvira Sara , Daum Bertram , Gold Vicki A. M. , Collinson Ian
Published: January 2023

Gram-negative bacteria are surrounded by two protein-rich membranes with a peptidoglycan layer sandwiched between them. Together they form the envelope (or cell wall), crucial for energy production, lipid biosynthesis, structural integrity, and for protection against physical and chemical environmental challenges. To achieve envelope biogenesis, periplasmic and outer-membrane proteins (OMPs) must be transported from the cytosol and through the inner-membrane, via the ubiquitous SecYEG protein–channel. Emergent proteins either fold in the periplasm or cross the peptidoglycan (PG) layer towards the outer-membrane for insertion through the β-barrel assembly machinery (BAM). Trafficking of hydrophobic proteins through the periplasm is particularly treacherous given the high protein density and the absence of energy (ATP or chemiosmotic potential). Numerous molecular chaperones assist in the prevention and recovery from aggregation, and of these SurA is known to interact with BAM, facilitating delivery to the outer-membrane. However, it is unclear how proteins emerging from the Sec-machinery are received and protected from aggregation and proteolysis prior to an interaction with SurA. Through biochemical analysis and electron microscopy we demonstrate the binding capabilities of the unoccupied and substrate-engaged SurA to the inner-membrane translocation machinery complex of SecYEG–SecDF–YidC — aka the holo-translocon (HTL). Supported by AlphaFold predictions, we suggest a role for periplasmic domains of SecDF in chaperone recruitment to the protein translocation exit site in SecYEG. We propose that this immediate interaction with the enlisted chaperone helps to prevent aggregation and degradation of nascent envelope proteins, facilitating their safe passage to the periplasm and outer-membrane.
The Classroom Profile for Integrated Communication Supports: A Framework to Support Augmentative and Alternative Communication Coaching Services in the School Setting
Authors: Foster Susan Trimbur , Brown Megan Thurber , Michels Carol M.
Published: January 2023

Purpose:

The purpose of this clinical focus article is to describe how a shift away from a reactive, practitioner-based model of Assistive Technology (AT) supports to a proactive, team-based coaching model improved outcomes for students with complex communication needs (CCNs). A framework known as the Classroom Profile of Integrated Communication Supports (C-PICS) can be used to guide speech-language pathologists and AT practitioners using a proactive approach to support the implementation of universal classroom strategies for communication.

Method:

The C-PICS framework was used in two classroom environments to structure AT coaching and support. A combination of observation and interview with staff was used to complete the C-PICS. The information gathered was used to guide AT coaching activities.

Results:

Preliminary data indicate that the C-PICS support a coaching implementation model for supporting students with CCN. When compared with the initial administration of the tool, two classrooms demonstrated increased availability and use of communication supports, increased student performance, and increased staff engagement across educational environments. In addition, the C-PICS provided a consistent means of data collection to measure these areas of improvement.

Conclusions:

Additional uses of the C-PICS are discussed. The authors provide directions for future implementation of the C-PICS as a tool to support inclusive service delivery.
Using Active Learning Strategies to Strengthen Cultural and Linguistic Diversity Training in Communication Sciences and Disorders Programs
Authors: O'Fallon Maura , Garcia Felicidad
Published: January 2023

Purpose:

Training in cultural competence is an accreditation requirement for graduate programs in communication sciences and disorders (CSD; Council on Academic Accreditation in Audiology and Speech-Language Pathology, 2020). Cultural and linguistic diversity (CLD) instruction within CSD programs and current instructional models may not provide students with effective training in this area (Hammond et al., 2009; Higby et al., 2021; Stockman et al., 2008). In this tutorial, we present active learning as an instructional approach that may provide students with stronger training in the assessment and treatment of individuals with unfamiliar cultural and linguistic backgrounds.

Conclusions:

Active learning emphasizes the creation of a supportive classroom environment, teaching skills rather than content, and fostering metacognition in students (Bransford et al., 2000; Gooblar, 2019). We propose a three-part pedagogical model for using active learning strategies to improve clinical training in assessment and treatment of clients with CLD backgrounds. This pedagogical model encourages instructors to
set the scene
for learning,
present a problem to solve,
and build in
reflection and generalization.
Active learning approaches, as described in the model, are ideal for teaching clinical problem solving across populations while reflecting on one's lived experience and positionality. Sample materials for readers to create their own lesson plans using the model are provided and reviewed.

Supplemental Material:

https://doi.org/10.23641/asha.21944264
Semi-automatic meteoroid fragmentation modeling using genetic algorithms
Authors: Henych Tomáš , Borovička Jiří , Spurný Pavel
Published: January 2023

Context. Meteoroids are pieces of asteroids and comets. They serve as unique probes to the physical and chemical properties of their parent bodies. We can derive some of these properties when meteoroids collide with the atmosphere of Earth and become a meteor or a bolide. Even more information can be obtained when meteoroids are mechanically strong and slow enough to drop meteorites.

Aims. Through physical modeling of bright meteors, we describe their fragmentation in the atmosphere. We also derive their mechanical strength and the mass distribution of the fragments, some of which may hit the ground as meteorites.

Methods. We developed a semi-automatic program for meteoroid fragmentation modeling using parallel genetic algorithms. This allowed us to determine the most probable fragmentation cascade of the meteoroid, and also to specify its initial mass and velocity. These parameters can be used in turn to derive the heliocentric orbit of the meteoroid and to place constraints on its likely age as a separate object.

Results. The program offers plausible solutions for the majority of fireballs we tested, and the quality of the solutions is comparable to that of manual solutions. The two solutions are not the same in detail, but the derived quantities, such as the fragment masses of the larger fragments and the proxy for their mechanical strength, are very similar. With this method, we would like to describe the mechanical properties and structure of both meteoroids belonging to major meteor showers and those that cause exceptional fireballs.
Adaptive Method for Estimating Traffic Characteristics in Corporate Multi-Service Communication Networks for Transport Companies
Authors: Ageev Sergey , Karetnikov Vladimir , Ageeva Nina , Bulanets Artem
Published: January 2023

An adaptive method for estimation the traffic characteristics in high-speed corporate multiservice networks based on the methods of preliminary indistinct computer training, functioning in real time mode, is proposed and investigated in this paper. The relevance of the study is due to the fact that many processes of network management in high-speed corporate multiservice communication networks need to be implemented in a mode close to real time. The approach proposed in the paper is based on the concept of conditional nonlinear Pareto-optimal filtering V. C. Pugachev. The essence of this approach consists in the fact that estimation of the traffic parameter is performed in two stages - on the first stage the parameter value prediction is estimated, and on the second stage, when the next parameter observations are received, the parameter values are corrected. In the proposed method and algorithm, predictions of traffic parameter values are made in a small sliding window, and adaptation is implemented based on pseudo-gradient procedures whose parameters are adjusted using the Takagi-Sugeno indistinct logic inference method. The proposed method and algorithm belong to the class of adaptive methods and algorithms with prior learning. The average relative error of the estimated traffic parameters estimation does not exceed 8.2%, which is a sufficient value for the implementation of operational network management tasks.
Algorithmic Networks and Object-Oriented Programming
Authors: Marley Vladimir , Vasilchenko Dmitrii , Tyndykar Lubov , Plotnikov Sergey , Korolev Oleg
Published: January 2023

The article considers relevance of using the formalism of algorithmic networks in terms of object-oriented programming and the development of the basic ideology of using the formalism of algorithmic networks to solve problems in the framework of object-oriented systems is considered. A solution is proposed to create a network of connected objects of a certain structure with the formalism of algorithmic networks and its algorithmic completeness. The choice of the platform for the implementation of the required task on the software part was made, providing full support for the object-oriented paradigm and allowing the use of the event mechanism and the delegate mechanism. The main classes of the system are presented, and the interaction between them is discussed in detail in the execution diagram. The process of setting an algorithmic network and its calculation is considered. The ability to set algorithmic networks programmatically is implemented, which further allows you to create the required configuration of the algorithmic network and save it as files. The calculation process is considered.
Current problems in developing the new silk road from China to Europe
Authors: Smirnov Anton , Smolokurov Evgeniy , Bolshakov Roman , Parshin Viacheslav
Published: January 2023

The rapid development of China dates back to the twentieth century. From an economically underdeveloped country, China has become one of the economic leaders of the world, a major exporter of goods around the world. In the twenties of the twenty-first century, it has in its hands a resource that no other country can boast of. One of China’s great boasts is its extensive network of high-speed railway lines (HSR). The length of China’s HSR surpasses all existing HSRs in the world. In 2012, the country proposed a lucrative project: building a new HSR network across Eurasia to link a number of countries. And while some work is currently underway, there is still no clear plan. The project seems promising not only for China, but also for the other participating countries; it would develop the regions and the economy as a whole and anchor the countries on the world stage in terms of freight transport. But in the ten years of the project’s existence, no clear implementation has come to fruition. It is necessary to find out what is stalling the project and find solutions to existing problems. Or, on the contrary, to finally recognize that the project is considered unprofitable for a number of countries. It is known that part of the territory of Russia, a country that has not yet given a clear answer to this project, will be the largest section of this road, which means it is worth digging deeper into the problem of this project in Russia as well.
Optimization of container traffic distribution on the railway network
Authors: Kisselyova Olga , Abdirassilov Zhomart , Vakhitova Liliya , Izbairova Aliya , Uvaliyeva Assem
Published: January 2023

The paper considers the problem of optimal redistribution of transit container flows on the railway network. The problem is proposed to be solved as the problem of a multi-commodity flow of minimum cost using the relaxation method. The relaxation method allows choosing the most efficient variant of the next solution at each iteration step. To search for the optimal distribution of container flows on the network, graph theory was used, i.e., the network is presented as a multigraph with a set of vertices and arcs, for which the costs of transporting a unit of production, the maximum and minimum values of the flows between the vertices are given, the conditions for maintaining the flow at the vertices of the graph and restrictions on the amount of flow along the arcs are given. It has been established that in order to implement the task, it is necessary to take into account the unit costs for the movement of container flows between the nodes of the railway network, taking into account the capacity of the branches between the junction stations. The developed mathematical model for the redistribution of container traffic allows you to identify areas with limited throughput, develop options for optimization measures, and, as a result, achieve an economic effect by reducing the cost of transporting containerized cargo.
Control of a six-phase synchronous reluctance motor
Authors: Gelver Fyodor , Belousov Igor , Samoseiko Veniamin
Published: January 2023

The results of the research on control of high-speed and lowspeed six-phase synchronous reluctance motor are presented in this paper. Two control variants of SynRM are considered: two galvanically isolated three-phase windings and one six-phase winding connected in the wye. The mathematical description, mathematical models, and results of synthesis of control systems for two considered variants of control of SynRM are given. The problems encountered by the authors are considered and the ways of their solution are presented. The results of practical research and comparison of the variants considered in controlling six-phase SynRM are presented. Conclusions about advantages and disadvantages of various control variants of a SynRM are made on the basis of theoretical and practical research and the obtained results. The presented results of mathematical description and synthesis of control system and also results of experimental research at control of prototypes of SynRM can be used at synthesis of control systems of any types of multiphase electric machines.
Impact of Wi-Fi network coverage planning on the logistics objects’ location accuracy
Authors: Kokoreva Elena , Shurygina Ksenia , Bragin Anton
Published: January 2023

The use of Wi-Fi networks to construct a system for determining the object’s location inside warehouses is the simplest and most cost-effective way of solving the logistical problems. The positioning in such a system is based on measuring the received signal strength level with the application of the lateration (trilateration) method to calculate the target’s coordinates. This method requires taking into account the electromagnetic environment in the room and the fulfillment of certain requirements for the construction of a network serving as a positioning tool. Incorrect access points placement in the premises leads to a significant positioning error, unacceptable in most cases of the system’s application. The article isdevoted to the improvement of the positioning accuracy by the network structure correction in accordance with the coverage and frequency planning. To implement the lateration algorithm for the determination of the distances between a mobile object and an access point, three radio wave propagation models were used, selected from a variety of similar models after the preliminary analytical and experimental studies. The power loss coefficients used in the models for the signal’s passing through partitions and floors were adapted to the configuration and features of the rooms in which the experiments were conducted.
Calculation of damage to water biological resources during the construction of railway approaches to transport crossing through the Kerch Strait
Authors: Sytnik Nataliy
Published: January 2023

The article deals with the main factors of the negative impact of the construction of railway approaches to the transport crossing through the Kerch Strait on the biota and affected aquatic ecosystems. The paper presents data on the calculation of the loss of aquatic biological resources as a result of disturbance (redistribution) of natural runoff from the deformed surface of the drainage basin. The data on the assessment of damage to aquatic biological resources due to damage to areas of the floodplain of a watercourse of fishery importance (floodplain spawning grounds) is also provided. Based on the analysis of the technical solutions of the project and the measures to protect the environment proposed in it, the main types of impact on aquatic biological resources are the following: deterioration of the conditions for fish reproduction as a result of damage to floodplain spawning grounds of the Dzharjava river; a decrease in the fish productivity of the watercourse as a result of the disturbance (redistribution) of the natural runoff from the deformed surface of the drainage basin. The paper considers compensation and environmental protection measures aimed at reducing the negative impact on the water environment during the construction and operation of railway approaches to the transport crossing through the Kerch Strait.
Vibrations of the underground pipeline in the vertical plane considering the rotational inertia and transversal shear
Authors: Matkarimov Abdurashid , Khudjaev Mukhiddin
Published: January 2023

The subject of the study is the underground pipeline vibration in a vertical plane, considering the inertia of rotation and transverse shear. A system of differential equations of motion of an underground pipeline with natural boundary and initial conditions under spatial seismic loading is derived in the article. From the formulas obtained, it is necessary to determine the internal forces in the sections of the underground structure. Research methods are based on the variational equation of seismic loading of underground structures in a matrix form; methods of mathematical modeling and numerical methods for their solutions An algorithm and a program for the numerical solution of the resulting system of equations are compiled. Having determined the displacements, the internal forces in the sections of the underground pipeline are defined. The influence of the inertia of rotation of the section and the transverse shear on the values of displacements and force factors of the pipe is studied. Calculation results are given.
The use of predictive analysis algorithms and methods for the overhead contact line operation mode selection
Authors: Smerdin Aleksandr , Ermachkov Gleb , Sidorov Oleg , Petin Daniil
Published: January 2023

The article tells about the problem of the railway infrastructure objects reliable, safe, and effective operation on an example of the overhead contact line operation mode rational selection. The overhead contact line operation mode modelling results are described. The model is considering exploitation and climatic conditions and is based on the clusterization, classification, and neuronal network modelling methods for predictive analysis of a large amount of data.
Some addition to the development of mathematical support for transport navigation
Authors: Ovchintsev Mikhail
Published: January 2023

Formed in the 1960s, the classical methods of guaranteeing estimation are applied to provide navigation for various modes of transport. Many works of both foreign and domestic authors are devoted to the application of this method. Guaranteed estimation problems are methodologically substantiated by solving extremal problems, in particular, by the theory of optimal recovery of various classes of functions. This paper studies one of such problems, namely, the problem of optimal recovery of higher-order derivatives of functions of the Hardy class H^p,p≥1, given inthe unit circle at zero according to information about their values at the points z_1,…,z_n, forming a regular polygon centered at the origin. Thework consists of an introduction, two main sections, a presentation of the results and a conclusion. In the introduction, we present the necessary notions and results from [7]-[10]. The first section contains the error of the best method for approximating the derivatives f^((N) ) (0),1≤N≤n-1 (f(z)∈H_p ) with respect to the values f(z_1 ),….,f(z_n ). The correspondingextremal functions are also written here. In the second, the coefficients of the linear best approximation method are calculated. Examples of the optimal recovery of the first derivative of functions of the Hardy class H_H_p,p≥1 at zero from their values at a given finite number of pointsforming a regular polygon centered at the point (0,0) are given.
Evaluation of the impact of ambient temperature on fuel consumption by diesel and CNG buses
Authors: Chikishev Evgeniy , Iarkov Sergei
Published: January 2023

The paper is devoted to the problem of bus operation in various climatic, road and transport conditions. The reasons for replacing diesel buses with more environmentally friendly ones using natural gas are described. Experimental studies on the operation of large-class buses –LiAZ-529265 diesel bus and LiAZ-529267 CNG bus in an urban environment are given. The dependences of the influence of various ambient temperatures on fuel consumption are obtained, and mathematical models that describe these dependences are proposed. The range of studied temperatures is from minus 31°C to +37°C. As a result of drivingexperiments, it was found that the natural gas consumption of the LiAZ-529267 bus is 23-24% higher than that of the diesel counterpart under similar road and transport operating conditions. The deviation between the minimum and maximum values of diesel fuel consumption is 37-45%. For compressed natural gas, the deviations were 36-43%. However, the equivalent cost of purchasing natural gas is 52% lower than that of diesel fuel.
Analysis of solutions of a nonlinear system of differential equations with a small parameter
Authors: Petelina Vera
Published: January 2023

Based on the results of the article, perturbations of the first and second order are determined in rectangular coordinates and components of the speed of the body. The constructed system of differential equations of the perturbed motion of the body makes it possible to create a unified algorithm for determining perturbations of the second and higher orders in the form of finite polynomials in powers of regularizing variables, which are selected at each stage of the approximation and with the help of approximating polynomials it is possible to calculate any intermediate point of the trajectory of the motion of the body. It was proved that the introduction of regularizing variables provides the representation of the right-hand sides of the system of differential equations of perturbed motion in the form of polynomials with respect to this regularizing variable. A procedure for reducing the degree of approximating polynomials using Chebyshev polynomials was also performed.
Assessment of the technical condition of rolling stock and track in order to improve traffic safety
Authors: Martynenko Liubov
Published: January 2023

The basic task of the work was to conduct the research aimed at studying the technical condition of the track and its impact on the rolling stock since the car dynamics, especially in curves and on the mountain pass sections of the track, is completely dependent on track deviations. The real time data received from specialized car laboratories show the existence of deviations visually detected, however external deviations are not crucial since the main problem lies inside the structure with changes already taking place in the layers of the subgrade not reflected externally, still affecting the movement of the rolling stock, especially the cars already having permissible technical deviations in operation. The technical condition of the track is directly related to the subgrade and ballast layer therefore the research is aimed at studying the lower base of the track in order to identify defects and malfunctions limiting the speed of the rolling stock and posing a constant threat to the safety of the transportation process. The main task is to identify and study the technical deviation of the subgrade layers, which directly affects the safety of the rolling stock, especially with an increase in freight traffic. The article proposes a method for evaluating GPR sounding of the subgrade, which sees into the depth of the soil up to 8 meters, depending on the equipment used. A theoretical study of the influence of the subgrade on the derailment of the rolling stock due to the deformation of the rail-sleeper grid allows to find the cause of deviations in the dynamics of the car when passing through the corresponding section. This article contains a quantitative and qualitative analysis obtained as a result of a research based on which comprehensive measures were developed to ensure traffic safety. At present, the operation of railways requires increased safety, an increase in the speed of rolling stock and the throughput of the main railway network. With regular inspections at the wagon laboratories, a better study of the track and subgrade is obtained through regular monitoring. Due to the complex of measures for diagnosing the track, a qualitative assessment of the performance of individual operations and the timely detection the railway track faults, as well as subsequent repairs according to the actual state of the track, are carried out.
Development of the strategy of sustainable mobility of society in the context of the use of aerial vehicles
Authors: Saprykina Natalia
Published: January 2023

The article is devoted to the actual problem of the development of the strategy of sustainable mobility of society in the context of the use of aircraft, as well as the prospect of their use in various fields of activity. The purpose of the article is to gain new knowledge in the development of the strategy of sustainable mobility of society related to the concept of the formation of objects of aerostatic architecture. Historical precedents and modern controlled objects of airship construction as transport systems of a new generation in various fields of activity are considered. The concept of the development of sustainable mobility in aerostatic architecture is revealed in connection with the general ecological orientation of society and as a resource for the development of alternative habitat space. A wide range of use of aerial vehicles for solving important tasks of sustainable development of the life activity environment is indicated. A selection of design proposals for objects of aerostatic architecture is given, which allows us to outline the directions for searching and conducting further promising research in this area. A selection of design proposals for objects of aerostatic architecture is given, which allows us to outline the directions for searching and conducting further promising research in this area. The results of the study can be useful for the theory and practice of the formation of sustainable mobility of society, as they open up completely new opportunities for creative search.