bluuebunny/crossref_metadata_2025_split huggingface dataset:
Universal prediction algorithm in maneuvering target tracking
Authors: Zemskov Y , Koptseva E , Pankratova A , Borodulina S , Kalinov S 
Published: June 2022

Abstract
The paper considers the methods to increase the accuracy of trajectory processing of the results of radar measurements in automated air traffic management systems (AATMS). The recursive filters traditionally used in the secondary processing path of radar information of modern AATMS systems are briefly considered: alpha-beta filter, linear and extended Kalman filters, multi-model filter. Along with multi-model Kalman filters it is proposed to use a universal filter based on the universal prediction theorem, the accuracy of which is asymptotically no worse than any other filter in the class of continuous functions. The algorithm for the operation of a universal alpha-beta filter was developed. As a result of modeling, it was obtained that the mean square of the tracking error of the trajectory of a maneuvering target for the universal filter during the change of the motion model turned out to be lower than for traditional filters.
On the choice of a failure criterion for pumping units based on the results of vibration spectra measurement
Authors: Suleymanov R N , Suleymanov S R 
Published: June 2022

Abstract
The paper presents the results of a study of the possibility of failure prediction (failure) of complex units (for example, pumping units) as a result of the impact of vibration forces. It is shown that the total energy (time integral of the vibration power) at resonance frequencies and in an infinite frequency strip under the condition of the experimental coefficient can be a criterion for the failure of both individual units and the unit as a whole. In this case, the predicted failure time is a function of the calculated measure of destruction” and the accumulated energy.
Neural network technologies for analysis and risk assessment in forecasting the market of industrial financial instruments
Authors: Dvoryatkina S , Golovin D 
Published: June 2022

Abstract
The issues of risk analysis and assessment in forecasting the dynamics of prices on the stock exchange and the OTC market have always been a difficult task for many researchers and analysts. Successful investment is largely determined by knowledge of the future situation in the financial market. The article deals with the issues of search and development of technical tools for risk analysis and assessment in forecasting the market of derivative financial instruments under conditions of uncertainty. A recurrent network with a long-term short-term memory cell LSTM, which is one of the most powerful prediction models, was chosen as the architecture of neural networks. The development of technical tools for solving this problem was carried out on the basis of the C# programming language. An additional TA-Lib library served as a mathematical base for technical analysis, from which 42 technical analysis indicators were used during the development process, and for working with the LSTM recurrent network, the library Keras.NET. The ability to efficiently link memory and input remote data using these network memory cells provides a dynamic understanding of the data structure over time. The estimates of the accuracy of the forecast for the cost indicators of a derivative financial instrument obtained as a result of computer experiments showed the high efficiency of the constructed neural network model.
Investigation of the application of a high-voltage liquid voltage divider on Multisim software (version 10.0) and SolidWorks
Authors: Denmukhammadiev A M , Begmatov M T , Pardaev A I , Valikhanova H 
Published: June 2022

Abstract
The considered model was investigated according to the main characteristics corresponding to the real process (even the geometrical dimensions and electrophysical parameters coincide). It is known that a prerequisite for physical modeling is a strict geometric similarity of the model and character, as well as the equality of the corresponding similarity criteria in them. The cheapest insulator in the power industry is air. The air environment plays an important role in the design of ball arresters used in pulsed technology. In this case, it is important to measure the high-voltage voltage and obtain the exact shape of the discharge current pulse on the oscillogram. For this purpose, in this work, liquid voltage dividers were studied and the corresponding electronic models were developed. The results obtained in the electronic model are unreliable without experimental verification. The measuring equipment during the experiment gave positive results, indicating the quality of measurements, the correctness of the process of electric pulse treatment of seeds.
Method for modeling the process of wear of gear teeth
Authors: Ishmuratov Kh , Hamroev R K , Kurbonov B B , Mirzaev N N 
Published: June 2022

Abstract
When modeling gears by means of roller analogues it is necessary to take into account that the degree of slippage is equal to zero in the meshing pole of the gears, in thecontact zone ofinitial circles of the gears. The greatest slippage occurs between the tooth head of the master gear and the tooth foot of the driven gear, and between the tooth head of the driven gear and the tooth foot of the driven gear. Thus, the simulation of the wear process of gear wheels with roller counterparts is achieved by ensuring equality of geometric and kinematic parameters (radii of contact point curvature, degree of relative slippage of the surfaces, friction paths) and contact pressure.
Modern problems of digitalization in energy
Authors: Kondratiev V V , Permyakova D N , Olentsevich V A 
Published: June 2022

Abstract
The formation of the technological progress of the Russian economy is inextricably linked with the development of the industry. And one of the key industries is energy. It is she who largely determines the socio-economic and industrial development of the country. Without a doubt, with digitization, business becomes more efficient and products become more accessible. At this stage, the digitalization of postal systems in the Russian Federation makes it possible to process more than a billion e-mail messages every day. This leads to an increase in the growth rate of labor productivity and a decrease in costs. Therefore, there is reason to say that the digitalization of the electric power industry will allow not only achieving similar results, but also surpassing them.
Risk-based approach towards energy production
Authors: Permyakova D N , Konyukhov V Yu , Kondratiev V V 
Published: June 2022

Abstract
In modern digitalization conditions, reducing operating costs in order to increase profits in the energy sector is one of the fundamental tools for the company's growth and planning the production sector for the long term. One of the most modern approaches to work is risk-based. The article discusses the main aspects of the formation of this approach, the probability and consequences of failure, as well as the methodology for calculating technical risk.
An experimental study on the anisotropic and intermittent behaviour of a turbulent flow over a rough bed
Authors: Coscarella F , Penna N , Servidio S , Gaudio R 
Published: June 2022

Abstract
The flow field in open channels can be classified into different zones according to the velocity distribution. To explore the anisotropic and intermittent behaviour in the turbulent flow layers, an experimental study was performed using Particle Image Velocimetry (PIV) measurements in a hydraulic flume with rough bed. Specifically, the analysis has been focused on the two-dimensional (2D) high-order structure functions applied to the velocity data. It is demonstrated that the system spans from large-scale anisotropy, which is induced by the main shear of the boundary layer, to small-scale isotropy. Moreover, it is shown that the intermittency is more pronounced in the near-bed layer, where the flow is more populated by coherent whirling structures. In essence, both anisotropy and intermittency are proved to be important phenomena for natural bed rivers, since they affect the turbulence transport characteristics of the flow.
Transport analysis of solid sediments in a ballast water flow
Authors: Amoresano A , Iodice P , Langella G , Mocerino L , Quaranta F 
Published: June 2022

Abstract
The ballast waters, necessary for the stabilization of the ships, move with it and are often discharged into marine environments sensitive to non-native organisms and transport polluting sediments capable of altering the balance of the local ecosystem. In this work, the transportability of particles smaller than 1 mm in size is studied by experimental analysis and the velocity field, generated by the flow, is detected by means of an image acquisition system. The work is developed with an experimental method using a variable flow rate hydraulic circuit equipped with a transparent duct capable of allowing optical access. The measurements of the motion of the particles, acquired by means of the fast photography system, along a section of the transparent duct are analyzed near the sedimentation area. By means of an image processing the frequency of the particles, crossing trough the reference section is detected. The data processing by FFT provides the average flow rate of the sediments and allows quantizing the particles transport according to the different hydrodynamic conditions imposed.
On the Wall Pressure Fluctuations induced by a Supersonic Jet over the Wing pressure side
Authors: Meloni S. , de Paola E. , Curcio L. , Camussi R. 
Published: June 2022

Abstract
Supersonic jet wing integrated configurations are expected to be relatively louder than subsonic installed configurations, increasing the wall pressure load transmitted inside the fuselage and stressing the wing/fuselage panels with very energetic and frequency localized supersonic effects. In this framework, a model-scale experimental investigation of an installed jet-wing configuration has been performed using a supersonic convergent-divergent nozzle interacting with a wing generated by a NACA4415 airfoil. The measurements have been carried out in the semi-anechoic chamber of the “G.Guj” Fluid Dynamic laboratory at the University Roma Tre. Wall pressure fluctuations are acquired at different axial locations in stream-wise and span-wise directions. Measurements are repeated for different wing radial positions and by varying the NPR between 2.2 and 2.6, thus exploring both over-expanded and under-expanded jet flow conditions. The flow features that characterize the different flow regimes were caught using the Background Oriented Schlieren (BOS) technique. Fluctuating pressure data, acquired with flush-mounted pressure transducers, were analysed in the frequency domain, considering a Fourier-based approach. A comparison of results obtained with an infinite flat plate has been used to highlight effects generated by the discontinuity related to the trailing edge.
Line Scanning with Gas-Coupled Laser Acoustic Detection
Authors: Gulino Michelangelo-Santo , Bruzzi Mara , Vangi Dario 
Published: June 2022

Abstract
The Gas-Coupled Laser Acoustic Detection (GCLAD) is an optical technique for ultrasonic detection based on the deviation that a laser beam sustains when travelling in a fluid that features refractive index fluctuations. If the laser beam is perpendicular to the wave propagation direction, the technique enables simultaneous detection of direct waves in mechanical components and eventual echoes from defects to be achieved.
The technique is applied to the inspection of elements predominantly extending in one/two dimensions as bars and axisymmetric pieces, exploiting a signal enhancement effect occurring in defects’ proximity. The phenomenon, namely constructive interference between wave crests of a direct Rayleigh ultrasound and those associated with reflections on a defect flank, is first illustrated numerically. The effect of parameters like the angle between wave propagation direction and source-receiver distance on the GCLAD sensitivity is then experimentally highlighted. The technique is finally implemented to B-scan a steel plate with 1 mm wide, 20 mm long, and 3 mm deep surface defects.
Since the GCLAD probe laser beam insists on an entire line, defects present on that line can be identified without moving the device along such direction. This reduces the monitoring time compared to techniques leveraging on traditional air-coupled transducers or more sophisticated methods (Scanning Laser Source).
Exploring Mechanical Properties of SiO2 Elastic Micro-Nano Ceramic Fibres Aerogels
Authors: Wang Yanbo 
Published: June 2022

Abstract
With the development of hypersonic vehicles and the military, SiO2 elastic nano-fibre ceramic aerogel becomes a preferred and potential material due to its ultralight, thermal superinsulation, and superelasticity properties. Compared with traditional ceramic materials which are brittle and easily degraded, SiO2 elastic nano-fibre aerogel shows up with its outstanding characteristics under extreme conditions. Facing a major demand in the national strategy of thermal insulation materials, this study will keep an eye on these growing and famous novel materials. Summarizing current studies and research at home and abroad. And explaining the evolution from traditional SiO2 aerogels to elastic aerogels to new SiO2 nano-fibre aerogels with flexible elastic bonds. Finally, providing regulation factors that can be improved and employed in future experiments. Giving prospects and focus for future research.
Preparation and Consolidation Mechanism of Nickel Laterite Carbon Composite Hot Briquette
Authors: Huang Zhuang , Xing Zhenxing , Cheng Gongjin , Liu Jianxing , Xue Xiangxing , Ding Xueyong 
Published: June 2022

Abstract
Blast furnace smelting process has advantages in producing ferronickel products because of its low comprehensive energy consumption and high production efficiency. However, laterite nickel ore has poor performance of pellets and lump ore due to its own characteristics. At present, the main lumping method is low basicity sinter, which is difficult to optimize the charge structure. This paper mainly studies the preparation process of laterite nickel carbon composite hot briquette (LN-CCHB) and the influence of process parameters on the basic compressive strength properties, so as to explore a new charge for smelting laterite nickel in blast furnace process. Results showed that the influence of pressure and temperature of hot briquette on the compressive strength of NL-CCHB is obvious. The compressive strength of NL-CCHB increases with the increase of briquetting pressure increases first and then decreases with the increase of hot briquetting temperature. The FC/O ratio (the ratio of the fixed carbon mol (C) in coal to the reducible oxygen mol (O) in iron oxides) has little effect on the compressive strength of NL-CCHB. In the experimental range, the mixture of laterite nickel ore and pulverized coal can obtain NL-CCHB with compressive strength of more than 1300N after hot briquetting. After heat treatment, NL-CCHB with compressive strength of more than 1800N can be obtained. The optimum hot briquetting process parameters are: FC/O ratio 1.25, hot briquetting temperature 450°C, hot briquetting pressure 80MPa. The optimum heat treatment process parameters are: FC/O ratio 1.50, heat treatment temperature 550°C.
Study on fabrication technology and corrosion resistance of Fe-based amorphous alloy coatings by high-speed laser cladding
Authors: Wu Jianpeng , Wang Yuyue , Niu Qiang , Zhang Jingchun 
Published: June 2022

Abstract
In this paper, the AME201 Fe-based amorphous alloy coating was prepared by ultra-high speed laser cladding on the surface of 27SiMn alloy steel. The effects of technological parameters on the surface morphology, micro-structure and dilution rate of coating. Corrosion resistance and weight loss of matrix, AME201Fe coating, 316L coating and Fe901 coating were studied by salt spray corrosion test. The results show that the thickness of AME201Fe coating is mostly affected by powder feeding, laser power and scanning speed have a huge impact on the width of coating, and the dilution rate increased from 0.13% to 29% with the change of laser power, nearly several hundreds of times. The results of salt spray test show that the AME201Fe coating has the minimum weight loss value at each stage compared with the matrix, 316L coating and Fe901 coating, which can play a good role in surface protection because of less internal defects and no grain boundary dislocations.
Genome of the bee Holcopasites calliopsidis—a species showing the common apid trait of brood parasitism
Authors: Sless Trevor J L , Searle Jeremy B , Danforth Bryan N 
Published: June 2022

Abstract
Brood parasites represent a substantial but often poorly studied fraction of the wider diversity of bees. Brood parasitic bees complete their life cycles by infiltrating the nests of solitary host bees thereby enabling their offspring to exploit the food provisions intended for the host’s offspring. Here, we present the draft assembly of the bee Holcopasites calliopsidis, the first brood parasitic species to be the subject of detailed genomic analysis. Consistent with previous findings on the genomic signatures of parasitism more broadly, we find that H. calliopsidis has the smallest genome currently known among bees (179 Mb). This small genome does not appear to be the result of purging of repetitive DNA, with some indications of novel repetitive elements which may show signs of recent expansion. Nor does H. calliopsidis demonstrate any apparent net loss of genic content in comparison with nonparasitic species, though many individual gene families do show significant contractions. Although the basis of the small genome size of this species remains unclear, the identification of over 12,000 putative genes—with functional annotation for nearly 10,000 of these—is an important step in investigating the genomic basis of brood parasitism and provides a valuable dataset to be compared against new genomes that remain to be sequenced.
Ileo-ileal intussusception due to inflammatory fibroid polyp: a rare cause of small bowel obstruction in adults
Authors: Saeed Rafeh , Hassan Mekki , Tul-Zahra Fatima , Neary Peter 
Published: June 2022

Abstract
Intussusception in adults is a relatively uncommon occurrence for a cause of bowel obstruction, which can present acutely, chronically or in an acute on chronic fashion. It is clinically concerning because of the possibility of cancer acting as a lead point. Small bowel tumours are rare, mostly detected incidentally with small bowel obstruction. Inflammatory fibroid polyp (IFP) is a rare benign tumour of the small bowel, either detected incidentally on imaging or endoscopy carried out for other reasons, or presents with acute features. We present a case of small bowel intussusception caused by IFP within the distal third of the ileum as a leading point. The patient presented acutely with small bowel obstruction, on a background of recurrent non-specific abdominal pain over the preceding month, and the computed tomography scan revealed an intussusception that was timely managed with a laparoscopy-assisted small bowel segmental resection.
Management of a rare, giant multicompartmental lipoma of the hand: a case report and review of the literature
Authors: Shah Rushabh K , Rahman Shakeel M , Pywell Matthew , Ibanez Javier 
Published: June 2022

Abstract
Lipomas are the commonest benign tumour, made up exclusively of adipose tissue, and can arise anywhere in the body. However, giant lipomas of the hand, defined as &gt;5 cm in diameter, are rare. They have the potential to invade into surrounding areas and cause a multitude of symptoms due to the compression and proximity of underlying structures. We describe a case of a 64-year-old woman who presents with a swelling of the left thenar eminence, associated with numbness and tingling in all fingers. Magnetic resonance imaging and nerve conduction studies confirmed the diagnosis of a lipoma causing median nerve compression. The patient underwent elective surgical excision with good postoperative recovery. The excised lesion, measuring 12 × 7 × 2.4 cm, is one of the largest giant lipomas of the hand reported in literature, and the first to demonstrate invasion from the mid palmar space into both the dorsal sub-aponeurotic space and carpal tunnel.
Bounded model checking distributed temporal logic
Authors: Peres Augusto , Ramos Jaime , DionÍsio Francisco 
Published: June 2022

Abstract
The distributed temporal logic (DTL) is a logic for reasoning about temporal properties of distributed systems from the local point of view of the system’s agents, which are assumed to execute sequentially and to interact by means of synchronous event sharing. Different versions of DTL have been proposed over the years for a number of different applications, reflecting different perspectives on how non-local information can be accessed by each agent. In a recent paper, an automata-theoretic approach to model check DTL was proposed Subtil et al. (2020, Technical Report). Herein, we follow a different approach and adapt the bounded model-checking (BMC) algorithm for linear temporal logic to the case of DTL (see Biere et al. (2003, Adv. Comput., 58, 117–148) and Biere et al. (1999, TACAS 1999, 193–207)). For that purpose, a new notion of bounded semantics for DTL is proposed. In the BMC approach, the witness problem is translated to the satisfiability of a propositional formula that can be addressed (efficiently) by SAT solvers. An important application for this approach is verification of security protocols (Basin et al. (2011, Theoret. Comput. Sci., 412, 4007–4043); Caleiro et al. (2005, Electron. Notes Theor. Comput. Sci., 125, 67–89)).
Coronavirus Disease 2019 On Board a Submarine: A Retrospective Review
Authors: Weinberg Daniel , Edgar Mia , Majewski Michael , Wakefield Rozlyn 
Published: June 2022

ABSTRACT

Background
The submarine environment presents unique challenges in mitigating the spread of respiratory viruses because of the re-circulatory atmosphere and lack of ability to physically distance. The atmosphere of a submarine is periodically ventilated and continuously scrubbed. However, the air is recycled for months until the ship is able to ventilate. An outbreak of coronavirus disease 2019 (COVID-19) occurred on a U.S. Navy fast-attack nuclear submarine (SSN) with a crew of 128 personnel.

Methods
Demographics, symptom data, and test results for all crew members on board during the outbreak were collected. Testing was completed by real-time reverse-transcriptase polymerase chain reaction, and symptom data were collected via a patient-reported online application. Symptom results were collected from August 4, 2020 to September 1, 2020.

Results
The crew was 100% male, with a mean age of 27.0 years. All crew members met the stringent medical standards for submarine and sea duty. Fifty-five Sailors tested positive for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) (43.0% of the crew) during the outbreak. Additionally, nine Sailors (7.0% of the crew) met the criteria for infection despite testing negative, resulting in an overall attack rate of 50.0%. Among the 64 crew members with suspected or confirmed COVID-19, 1 (1.6%) was hospitalized. There were no deaths. Out of the 55 positive tests, there were 6 (10.9%) asymptomatic positive cases.

Conclusions
As expected, SARS-CoV-2 was able to spread rapidly among a submarine crew. In 11 days, the infection spread to 64 total crewmembers out of 128. Outbreaks such as these have played a role in future COVID-19 testing and mitigation protocols that have affected day-to-day operations.