bluuebunny/crossref_metadata_2025_split huggingface dataset:
Відновлення гармонійного сигналу по дискретним відлікам
Authors: Бондаренко Т. , Зенів I. 
Published: June 2021

При побудові різних датчиків часто прагнуть переходити від прямих аналогових методів вимірювання параметрів сигналів до цифрових методів на основі застосування аналогово–цифрового перетворення (АЦП) і мікропроцесорних пристроїв. В даному випадку оцінка параметрів сигналу виходить не з аналізу функції правдоподібності, а з розв’язання відповідних рівнянь, коренями яких є невідомі параметри: частота, фаза і амплітуда сигналу. Наведено формули для розрахунків невідомих параметрів гармонійного сигналу, а також формули для оцінювання похибки розрахунків.
Проаналізовано вплив співвідношення періоду дискретизації та періоду коливань на похибку розрахунків. Таким чином, вирішується завдання: за цифровими відліками гармонійного сигналу з амплітудою, що повільно змінюється, визначити максимально достовірні характеристики вихідного аналогового сигналу.
Бібл. 9, іл. 4, табл. 2
Підхід до використання методів СППР при розпізнаванні та ідентифікації транспортних засобів
Authors: Яковлев А. , Лісовиченко O. 
Published: June 2021

В даній статті проведено огляд застосування методів систем підтримки та прийняття рішень в компоненті детектування систем безпеки дорожнього руху. Системи підтримки та прийняття рішень досліджуються з 50-х років минулого століття, однак запропоновані в них підходи та методи досі не втрачають свою актуальність та активно використовуються при побудові інформаційних систем. Методи СППР надають структурні та конструктивні інструменти для побудови систем, що можуть ефективно вирішувати завдання в умовах невизначеності. В статті розглянуто підхід до вирішення завдання з детектування номерних знаків в компонентах розпізнавання та ідентифікації транспортних засобів систем безпеки дорожнього руху. Отримані результати продемонстровано на вирішенні практичного завдання та доведено ефективність запропонованого підходу.
Бібл. 13, іл. 8
Онтологічна стратифікація ІТ-інфраструктури при управлінні якістю ІТ- послуг
Authors: Колеснік В. , Ролик O. 
Published: June 2021

Розвиток складних інформаційних систем спричиняє появу великої кількості проблем, пов’язаних з управлінням. При цьому ключовою складовою будь-якої системи інформаційного суспільства є ІТ-інфраструктура, і для того, щоб мати можливість забезпечувати споживачів необхідними послугами, варто впровадити підхід до управління якістю послуг в ІТ-інфраструктурі. Стаття присвячена розвитку існуючого підходу до управління якістю послуг. Розглядається стратифікаційний підхід до розбиття складної ієрархічної системи. Запропоновано вдосконалення стратифікаційного розбит- тя на основі онтологічного опису цільового призначення використання ІТ-інфраструктури, що дозволяє врахувати специфіку поведінки ІТ-послуг у залежності від доменної області, у якій відбувається надання цих послуг. Окрім того, запропоноване розбиття базується на дедуктивному розгляді системи із подальшим збільшеннямкількості деталей на наступних етапах розгляду. Такий підхід дозволяє узгодити поведінку ІТ-інфраструктури на різних онтологічних рівнях, а також виявити залежності між цими рівнями. Для управління якістю на верхніх онтологічних рівнях, де конкретні властивості компонентів системи невідомі, використано статистичне керування процесом, яке спирається на статистичні властивості процесів, що протікають в ІТ-інфраструктурі.
Бібл. 15, іл. 3
Представлення ефективного методу розпізнавання тексту на зображенні, заснованого на критерії схожості структурних моделей символів
Authors: Польшакова О. , Мальченко Є. 
Published: June 2021

Об’єктом дослідження є методи розпізнавання рукописних символів. У статті зроблено огляд основних принципів оптичного розпізнавання. Метою роботи є представлення алгоритму розпізнавання тексту на зображенні, що має високу точність при невеликій навчаючій вибірці. Для досягнення мети пропонується оригінальний критерій схожості, який можна використати для ефективного порівняння сформованих структурних моделей символів. До уваги читача пропонується детальний розгляд алгоритму згаданого критерія схожості.
Бібл. 5, іл. 4
Математична модель перетворювача трифазної напруги у постійну з чоти- ризонним регулюванням напруги і активно-індуктивним навантаженням
Authors: Михайленко В. , Міхненко Г. , Бачинський В. 
Published: June 2021

У статті проведено аналіз електромагнітних процесів в електричних колах з напівпровідниковими комутаторами. Створено математичну модель напівпровідникового перетворювача з чотиризонним регулюванням вихідної напруги для аналізу електромагнітних процесів у напівпровідникових перетворювачах з широтно-імпульсним регулюванням. Наведено графіки, що відображають електромагнітні процеси у електричних колах. Математична модель напівпровідникового перетворювача також використовується для дослідження перехідних процесів у напівпровідникових перетворювачах з активно-індуктивним навантаженням. Розвинуто метод багатопараметричнихфункцій, які входять до алгоритмічних рівнянь аналізу усталених і перехідних процесів у розгалужених електричних колах з напівпровідниковими комутаторами і реактивними елементами, в напрямку урахування особливостей використання фазних і лінійних напруг мережі електроживлення. Розроблено нову математичну модель усталених іперехідних процесів у електричних колах напівпровідникових перетворювачів модуляційного типу з багатоканальним зонним використанням фазних напруг трифазної мережі живлення без урахування втрат електроенергії у комутаторах для швидкої оцінки впливу параметрів навантаження на характеристики регульованих синусоїдних і постійних напруг. Результати цієї роботи можна використати для розвитку методу багатопараметричних модулюючих функцій для спрощення аналізу перехідних процесів у електричних колах без врахуванням втрат у ключових елементах.
Бібл. 4, іл. 3
Molecular Diagnosis of Human Metapneumovirus in Hospitalized Children with Acute Respiratory Tract Infections using RT-LAMP: A Population-Based Prospective Study
Authors: Attar Ahmed Osman Gasim , Enan Khalid , Abdelghani Sara , Eltayeb Lienda Bashier 
Published: June 2021

Background: Human metapneumovirus (hMPV) is a major novel cause of acute respiratory infections ranging from wheezing to bronchiolitis and pneumonia in children worldwide. The aim of this study was to detect hMPV in hospitalized children with acute respiratory tract infections (ARTIs) by using reverse transcription-loop mediated isothermal amplification (RT-LAMP) assay.	Methods and Results: A total of 68 children with ARTIs who were clinically suspected of acquiring hMPV were included in the study in the period between January 2019 and February 2020. Posterior-pharyngeal (throat) swabs were obtained from each patient. hMPV RNA was revealed in 18(26.5%) cases. The age range was from <1 year to 10 years (mean age of 5.25±2.62). Sixteen (23.5%) of the participants were in the age group of <1 year, where the majority of hMPV-positive subjects (n=11) were found (16.2% of the total number of infected children) (P=0.0025). The majority of hMPV-negative subjects (n=15) were found in the age group of 5-10 years (22% of the total number of infected children) (P=0.0025). Cough, fever, and shortness of breath were common symptoms in hMPV-positive children: 15(83.3%), 13(72.2%), and 12(66.7%), respectively. There was a statistically significant correlation between common clinical symptoms and the age group of hMPV-positive children: symptoms were common in the age group of <1 year. Conclusion: Our study represents the first report in Khartoum, Sudan, on the detection of hMPV using RT-LAMP. RT-LAMP is a valuable, quick diagnostic technique for hMPV detection.
Development of Energy-Efficient Modes of Installations for Heat Treatment of Concrete Products Using Numerical Calculation Methods
Authors: Romaniuk V. N. , Niyakovskii A. M. , Chichko A. N. , Yatskevich Yu. V. 
Published: June 2021

Production of concrete and reinforced concrete products in the conditions of the Republic of Belarus and in the countries with similar climatic conditions requires heat treatment in heat-technological installations in order to achieve the desired strength of the products at the appointed time, which consumes a great amount of thermal energy. In this case, the purpose of equipment operating modes is associated with a number of difficulties when it comes to new products of complex spatial configuration and structure. The optimality criteria of such modes are, as a rule, the duration and temperature limits of processing, providing the required strength with minimal energy consumption. In the conditions of serial production in the case of structurally simple objects, the assignment of heat treatment modes is carried out empirically. As the analysis shows, the modes obtained in this way do not meet the above criteria, especially from the standpoint of energy saving. The paper, using a mathematical model previously developed by the authors, proposes dependencies for calculating the optimal modes of heat treatment of concrete products that are distinguished by a complex spatial shape and multi-component structure. The method is based on three-dimensional transfer equations, taking into account internal sources of heat release due to the ongoing hydration reaction of the active components of the cement clinker, and the boundary conditions corresponding to the structure of the processed product, as well as the type of heat technology device for accelerated hydration. Equations are proposed for calculating the amount of heat energy supplied to the processed product providing a given strength at a specified time. On the example of a manufactured industrial concrete product and for the conditions of an actually used device for accelerated hydration, a comparison has been made between two limiting modes of heat treatment: with isothermal exposure and in its absence. As a result of the performed calculations, the dependences of energy consumption, temperature fields and the degree of hydration in the product for both modes have been obtained and an energy-saving mode of heat treatment corresponding to the case under consideration has been developed. It is shown that the used numerical method allows to solve problems of this type and to achieve thermal energy savings.
Assessment of Thermally Stressed State of Concrete Massif
Authors: Kovshar S. N. , Ryabchikov P. V. , Gushchin S. V. 
Published: June 2021

The paper describes a technique for assessing the thermally stressed state of a concrete massif of a foundation slab made of a self-compacting concrete mixture. The proposed method consists in a preliminary calculation of temperature fields in hardening concrete. The objects of research have been self-compacting concrete mix and structural concrete in the structure mass. The choice of materials for the preparation of a concrete mixture is given and substantiated. The composition of self-compacting concrete has been used to assess the thermally stressed state. A binder with a reduced exotherm has been used in order to reduce the self-heating of concrete. Studies have been carried out to assess the specific heat release of the recommended cement depending on the initial water-cement ratio. The effect of a chemical additive on the rate and magnitude of the specific heat release of cement has been studied. The paper presents the main theoretical provisions and an algorithm for calculating the thermal stress state of a concrete massif. The finite difference method has been used to calculate the expected temperatures and their distribution in the structure mass, and the temperature stresses in the sections of the concrete mass have been calculated to assess the thermally stressed state. The performed calculations of the temperature fields have made it possible to estimate the maximum possible temperatures and temperature differences over the sections of the concrete massif depending on the initial temperature of the concrete mixture and the average daily temperature of the outside air. Analysis of the temperature distribution has revealed the most dangerous sections of the concrete mass. An assessment of the thermal stress state of the concrete mass has been made on the basis of the results pertaining to calculation of temperature fields. The calculation of temperature stresses in the most dangerous sections of the concrete massif has been performed. It is shown that the calculated value of the temperature stress can serve as a characteristic of the thermally stressed state of the concrete mass. The formation of temperature cracks in a concrete mass is possible when the calculated value of the temperature stress exceeds the actual tensile strength of concrete. Comparison of the calculated and actual values of temperatures in the sections of the foundation slab has made it possible to conclude that the calculations of the temperature fields and, as a consequence, possible temperature deformations are correct.
Predicting the Evenness of Road Surfaces
Authors: Burtyl Yu. V. , Salodkaya M. G. , Kovalev Ya. N. 
Published: June 2021

The design of road surfaces involves application of a sophisticated algorithm system based on mathematical calculations and engineering solutions, with the calculation of evaluation criteria. It is precisely the observance of the standardized requirements in terms of design criteria that makes it possible to consider the design of the pavement as reliable, and the road as safe and convenient for traffic during the specified service life. When calculating the strength, based on the predicted traffic intensity and the composition of the traffic flow, calculations are carried out according to the main criteria: admissible elastic deflection, shear in layers of non-reinforced materials and in asphalt concrete, as well as the ultimate tensile stresses in cast-in-situ materials with the specified reliability level. However, in the accepted concepts for calculating the strength and reliability of road pavements, only the force effect is directly taken into account. To take into account environmental factors, it is necessary to develop a comprehensive indicator of the resulting impact of all factors. The paper presents a complex of factors influencing on traffic safety, road deformations and irregularities the height of unevenness, in particular, an increase in the dynamic impact on the road and the amplitude of vibration of a car wheel on a road with an uneven surface (when detached from the road surface), the coincidence of the vibration frequency of the car with the natural frequencies of vibration of the road surface, and as a consequence, on the behavioral features of driving. The arguments have been substantiated that the predictive models do not take into account a number of factors that have a significant impact on the formation of irreversible deformation in the layers of materials of road structures.
Sedimentary Facies Analysis of the Fluvial Environment in the Siwalik Group of Eastern Nepal: Deciphering its Relation to Contemporary Himalayan Tectonics, Climate and Sea-Level Change.
Authors: Rai Lalit Kumar , Yoshida Kohki 
Published: June 2021

Abstract
The Siwalik Group, ranging from the Early Miocene to Pleistocene, is believed to be controlled by contemporary Himalayan tectonics and climate. In this study, we established the fluvial system responsible for the deposition of the Siwalik succession along the Muksar Khola section and its controlling factors. Five sedimentary facies associations are identified which are interpreted as the deposits of flood plain dominated fine-grained meandering river (FA1), flood dominated overbank environment (FA2), sandy meandering river (FA3), anastomosing river (FA4), and debris flow dominated gravelly braided river (FA5). These change in fluvial style occurred around 10.5 Ma, 10.0 Ma, 5.9 Ma and 3.5 Ma due to the effects of hinterland tectonics, climate and sea-level change. The thick succession of intraformational conglomerate reveals the intensification of monsoon started around 10.5 Ma in the eastern Nepal Himalaya. The present study show asynchronous exhumation of the Himalaya east to west brought significant difference on the fluvial environment of the Neogene foreland basin. Moreover, this study also reveals continuous drifting of the foreland basin towards the hinterland concerning depositional age.
M2M Energy Saving Strategy in 5G Millimeter Wave System
Authors: Shen Aiguo , Ye Qiubo , Yang Guangsong , Hao Xinyu 
Published: June 2021

Abstract
M2M (Machine to Machine) technology has a broad application prospect in 5G network, but one of the bottlenecks is the energy consumption of intelligent devices powered by battery. In this paper, we study the energy saving strategy in 5G millimeter wave system. Firstly, a Discontinuous Reception scheme based on Beam Measurement (BM-DRX) is proposed to avoid the unnecessary beamforming. Secondly, by modifying the frame structure and optimizing the beamforming, the time of beamforming is further shortened and the power consumption is also saved. Finally, based on the ETSI (European Telecommunications Standards Institute) data model, the beam misalignment events are regarded as Poisson distribution, and the semi-Markov process is used to analyze the BM-DRX. Simulation results show that the proposed scheme can not only meets the delay performance, but also saves the energy consumption of the system.
A Bibliometric Analysis of publications in Ambio in the Last Four Decades
Authors: Ho Yuh-Shan , Gatto Andrea 
Published: June 2021

Abstract
Ambio is a leading journal in environmental science and policy, sustainable development and human-environment interactions. The paper at hand aims to run a bibliometric analysis to inspect the main publications features of Ambio in Science Citation Index Expanded SCI-EXPANDED. For this scope, a bibliometric survey has been carried out to investigate the journal’s historic characteristics in the Web of Science (WoS) categories of environmental sciences and environmental engineering for Ambio from 1980 to 2019. These are the categories for which the journal has been indexed throughout the indexed time frame. The paper proposes technical and methodological innovations, including improvements in the methods and original characteristics analyzed. Documents published in Ambio were searched out from SCI-EXPANDED. Six publication indicators were applied to evaluate the publication performance of countries, institutes and authors. Three citation indicators were used to compare publications. As a parameter, the journals’ impact factor contributor was applied to compare the most frequently cited publications. The journals’ impact factor contributing publications were also discussed. Results show that Sweden ranked top in six publication indicators and that the top three productive institutes were located in Sweden. A low percentage of productive authors emerged as a journal’s impact factor contributor. Similarly, a low relationship between the IF contributing publications and the highly cited publications were also found. Less than half of the top 100 highly cited publications in Ambio did not lie within the high impact in most the recent year of 2019. Three members of the advisory board in Ambio were the main productive authors. T.V. Callaghan contributed to most of the publications while papers published by J. Rockstrom as first and corresponding author contributed the most to the journal’s impact factor. An article authored by Steffen et al. (2007) scored the highest total citations in 2019.
Quantitative Proteomics by iTRAQ-PRM based Reveals the New Characterization for Gout.
Authors: Chen Guangqi , Cheng Jiafen , Yu Hanjie , Huang Xiao , Bao Hui , Qin Ling , Wang Ling , Song Yaxiang , Liu Xinying , Peng Ai 
Published: June 2021

Abstract
BackgroundGout is a common and complex form of immunoreactive arthritis based on hyperuricemia, while the symptoms would turn to remission or even got worse. So, it is hard to early identify whether an asymptomatic hyperuricemia (AHU) patient will be susceptible to get acute gout attack and it is also hard to predict the process of gout remission to flare. Here, we report that the plasma proteins profile can distinguish among acute gout (AG), remission of gout (RG), AHU patients, and healthy controls.MethodsWe established an isobaric tags for relative and absolute quantification (iTRAQ) and parallel reaction monitoring (PRM) based method to measure the plasma proteins for AG group (n=8), RG group(n=7), AHU group(n=7) and healthy controls(n=8).Resultseleven differentially expressed proteins such as Histone H2A, Histone H2B, Thrombospondin-1 (THBS1), Myeloperoxidase (MPO), Complement C2, Complement component C8 beta chain (C8B), Alpha-1-acid glycoprotein 1 (ORM1), Inter-alpha-trypsin inhibitor heavy chain H4 (ITIH4), Carbonic anhydrase 1 (CA1), Serum albumin (ALB) and Multimerin-1 (MMRN1) were identified. Histone H2A, Histone H2B and THBS1 might be the strongest influential regulator to maintain the balance and stability of the gout process. The complement and coagulation cascades is one of the main functional pathways in the mechanism of gout process.ConclusionsHistone H2A, Histone H2B and THBS1 may be novel biomarkers in discriminating gout attack from AHU or RG, providing new theoretical insights for the prognosis, treatment, and management of gout process.Trial registrationThis study is not a clinical trial.
Long-Term Electrically Stable Silver Nanowire Composite Transparent Electrode Under High Current Density
Authors: Wang Kaiqing , Jin Yunxia , Xiao Fei 
Published: June 2021

Abstract
Silver nanowire (AgNW) network has been employed to many electronic devices as transparent electrode. However, the poor electrical stability under current has been seriously holding its practical application, and we still lack long-term electrically stable AgNW system to study the underlying fundamental of electrical failure. In this work, the electrical performance and failure mechanism of chitosan-ascorbic acid (Chi-AsA)/AgNW composite under current stress were thoroughly studied. The composite electrode maintained stability above 24000 h under high current density of 100 mA cm-1. The main failure in AgNW composite is found to be a wave break perpendicular to the current rather than traditional uniform degradation across AgNW networks. More interestingly, the AgNWs in failed composite electrode kept their original smooth morphology excepting the crack area, while the AgNWs in pristine networks degraded to nanoparticles or became disconnected everywhere. The patterned AgNW composite in microscale exhibits similar long lifetime in resisting current stress as the bulk composite film. The effect of over-coating position, electrical stress, temperature and over-coating materials on the electrical stability were studied. The over-coating layer of Chi-AsA is proven to suppress the silver atoms from migration, reduce the concentrated Joule heating at junctions, and inhibit the corrosion. The Chi-AsA/AgNW composite enables electrically stable transparent conductor for next-generation optoelectronics, and the mechanism investigation may provide effective means of preparing electrically stable AgNW systems.