bluuebunny/crossref_metadata_2025 huggingface dataset:
Environmental Risks of the Pripyat River in a Changing Climate
Authors: Volchak Aliaksandr , Meshyk Aleh , Mazhayskiy Yury , Rokochynskiy Anatoliy , Jeznach Jerzy
Published: November 2020

The paper considers the hydrological characteristics of the Pripyat River. At the same time, extreme hydrological situations are described - floods and low water levels. The influence of land reclamation carried out in the catchment area on the river runoff was established. Forecast estimates of changes in the flow of the Pripyat River and its tributaries are given. For this, a method of hydrological and climatic calculations based on the joint solution of water and heat and power balances was adopted.
The temperature distribution in the load-bearing designs using LSTC
Authors: Borisevich Roman , Dragan Aleksey
Published: November 2020

The article discusses wall enclosing structures based on light steel thin-walled structures using mineral wool as a heater. The aim of this work is to determine the most energy-efficient building envelope. For this, two types of steel profile were chosen: thermal profile and thin-walled steel profile. Based on heat engineering calculations, the values of their resistance to heat transfer were obtained. The analysis of the calculations revealed the most energy-efficient design.
Pile quality assessment by vibroacoustic method
Authors: Leonovich Sergey , Budrevich Nely , Lyu Ping , Miao Jijun
Published: November 2020

In recent years, there has been a steady growth in industrial and civil construction, especially in large cities. Construction is often carried out in increasingly difficult geotechnical and hydrogeological conditions. This contributes to the emergence of new production technologies and diagnostic methods. The use of non-destructive testing methods allows you to quickly obtain information about various characteristics of an object without disrupting the process of its operation. This is especially true for hidden work, since access to the research object is practically closed, and its opening may entail undesirable consequences for the operation of the entire structure.
Physical parameters of insulation with a structure-forming material from flax noils
Authors: Romanovskiy Sergey , Bakatovich Aleksandr
Published: November 2020

The results of studies to evaluate the effective operation of the obtained thermal insulation slabs made of flax fibers or noils were carried out. The sorption moisture content of insulants based on flax fibers or noils with modified liquid glass was determined at a relative humidity of 40–97%. The influence of humidity on the thermal conductivity of the test materials was studied. The coefficient of vapor permeability of insulation made of flax fibers or noils was established. The results of field tests of experimental thermal insulation materials on the attic flooring of a residential building during the cold season were considered. The graphs of the temperature distribution over the structure of the attic flooring and heat flow indicators were obtained. The values of the heat transfer resistance of the attic flooring were calculated at an air temperature of -20 °C to -2 °C. The moisture content of insulation at the end of the cold period was determined and the dependence of the distribution of moisture over the thickness of the thermal insulation layer was plotted. The results of the tests carried out indicate the highest efficiency of thermal insulation slabs made of flax fiber noils in comparison with insulants based on flax fibers.
The Quality Monitoring of City Passenger Transportations on Regular Routes Using Data of Objective Control
Authors: Trubin Nikolay , Yakunin Nikolay , Yakunina Natalia , Lyubimov Igor
Published: November 2020

The article presents the development justification of the quality monitoring methodology of city passenger transportations by motor transport on regular routes based on the criteria development for the evaluation of the passenger transportations quality with the use of the objective control means.
Stand for cyclic tests of rack and pinion steering mechanism
Authors: Solomatin N. S. , Ivliev V. A. , Cherepanov L. A. , Kolodkin D. A.
Published: November 2020

At the present moment the motor vehicle designers pay particular attention to the vehicle active safety aspects. Steering control plays a significant role here, since its slightest malfunction may result in very unpleasant consequences. Therefore, specific attention is paid to the improvement of the steering control quality and reliability. This article presents the design of a stand for testing steering mechanisms of various dimensions through application of torque at numeral angles; the torque application aims to improve the vehicle active safety.
Impact of carrying capacity on the functioning of the railway network
Authors: Volodin Alexey , Gudkova Nadezhda , Astafiev Alexey , Alferov Vadim , Majerčák Jozef
Published: November 2020

Traffic flows associated with the movement of passengers and goods, characterized by traffic intensity, speed, direction and other factors are closely interrelated. The planned traffic intensity of these flows is de-termined by calculating the carrying capacity of the elements of the transport system or links in the delivery chains. The article provides a comprehensive analysis of the throughput capacity of a railway line, rail-way station, railway stations and landside areas, airports, and highways. Calculated dependencies, used to determine the carrying capacity of transport infrastructure facilities, have been carry out. It is shown that the throughput (capacity) of infrastructure facilities is focused, most of all, on the volume of cargo transportation in various industries. The factors that must be take into account when determining the conditions for further de-velopment and increasing the capacity of transport infrastructure elements are noted. All calculation methods are reduced to determining the maxi-mum permissible volume of cargo transportation (in passenger traffic, - passengers) that can be passed (processed) by an infrastructure object per unit (for a certain period) of time in the considered road transport and weather and climatic conditions.
Analysis of the electric vehicle market and the company’s competitive development strategy on it (on the example of “Faraday Future”)
Authors: Reshetko Natalia , Vakulenko Sergey , Kakhrimanova Diana , Belozerov Vladimir , Gašparík Jozef
Published: November 2020

Today, an unusual mode of transport, namely an electric vehicle, increasingly be seen on highways and traffic jams. The demand for such a trendy wild is constantly increasing. In addition, it is not surprising, because there are plenty of reasons for it. Due to the economic crisis, the increase in the price of gasoline and oil, many began to wonder whether to buy the usual car for us and further save and purchase an environmentally friendly product. By 2020, more than 120 different models of electric vehicles will be on the market. These are great machines. The internal combustion engine against their background will look old-fashioned. The purpose of this work is to analyze the current activity of the company and offer to develop a real-world marketing model based on the requirements of the modern market. Faraday Future, an electric machine company with progressive growth rates, chosen as the subject of the study. The article is relevant and useful to all interested electric vehicles, entrepreneurs and other interested persons.
Investigation of a multicomponent FeCoCrAlTiCuMo alloy coating applied by a combined process based on atmospheric plasma metallization
Authors: Kadyrmetov Anvar , Popov Dmitri , Snyatkov Yevgeny
Published: November 2020

A brief analysis of the most common methods for producing multicomponent alloys, including high-entropy alloys (HES), is presented in terms of their use as an alternative to coatings made of traditional structural metal materials. Preliminary studies of the microstructure and phase composition of the coating obtained by plasma deposition of FeCoCrAlTiCuMo powder in the equiatomic ratio of components are presented . The results of the research showed the possibility of obtaining a multicomponent single-phase solid solution by plasma sputtering and indicated the feasibility of its further study.
Analysis of surface structure of zirconia crystals in case of friction against steel
Authors: Alisin Valery , Borik Mikhail , Kulebyakin Alexey , Lomonova Elena , Suvorova Irina
Published: November 2020

The article considers the formation of the third body during dry friction of the nanostructured zirconia crystals partially stabilized with yttria against steel. The assumption is substantiated that the tribological properties of the studied friction pair are determined by the properties of the films formed on the surface of the crystals. Friction tests under sliding conditions were performed according to the “disk-finger” scheme. The results of electron microscopic examination of the friction surfaces of crystals are presented. The elemental composition was determined, and the phase composition of the transfer films of various sections of the crystal friction surface was calculated. At high magnifications, it was found that the friction surface of samples with 2-4 mol.% of Y2O3 has the sufficiently homogeneous structure of the films with traces of boundaries of smaller particles of the transferred material. Destruction of the friction surface of a sample with a Y2O3 content of 8 mol.% occurs at a deeper level and affects not only the layer of secondary structures, but also the underlying layers of the base material.
Quantitative correlations between wear behavior of Ti1-xAlxN coating, structural transformations of the substrate WC-Co and coating itself during cathodic arc evaporation
Authors: Kameneva Anna , Kameneva Natalia , Karmanov Vadim
Published: November 2020

The temperature ranges of structural transformations in WC-Co and Ti1-xAlxNin the process of cathode-arc evaporation are analyzed. The limiting values of the WC-Co temperature before the deposition of the coating correspond to 773 ... 873 K, after which the hardness of WC-Co and, as a consequence, the hardness of the composition WC-Co / Ti1-xAlx deteriorates. Analysis of the coating structural transformations made it possible to establish the structuring stages of the Ti1-xAlx coating during its deposition. Wear test was carried out for Ti1-xAlx coatings formed at each structuring stage. Wear test were carried out according to the finger-disk scheme at 300 K in coolant-cutting fluid on a laboratory friction machine. The wear behavior of the Ti1-xAlx coating are unstable at 773 K, then improve at 773 ... 853 K, stabilize with an increase in temperature to 963 K. The nanostructured Ti1-xAlx coating formed in the temperature range T sub/T m = 0.18... 0.23have the best complex of wear properties in comparison with analogues.
Stages of technological process of high anisotropy formation of magnetic properties under «dry» pressing of powder products
Authors: Vernigorov Yuri , Lebedev Valeriy , Davidova Irina , Chunakhova Lydianna , Korolkov Yuri
Published: November 2020

The article proposes the description of technological production process of anisotropic products from powders of high materials which provides powders preparation and products made of them. It has been shown that the main drawback of «wet» pressing technology is low accuracy at dosing wet charge. To eliminate warping and cracking of briquettes obtained by «wet» pressing during the sintering, they are subjected to air drying at room temperature within 48-72 hours. However, the percentage of product failure due to mechanical and magnetic characteristics remains high. Practically all the drawbacks of «wet» pressing can be eliminated by reverse to dry powder pressing, which allows to obtain low mass magnets without additional final finishing machining, to avoid warping and cracking of the product, and to reduce sintering time. Nevertheless, under the dry powder pressing the magnetic characteristics of products are significantly lower than under the wet pressing. When working with disperse materials, a promising direction is to converse them into fluidized state. To obtain the fluidized state of powder materials, vibrational technologies are used, involving the transfer of a wide range of energy to the powder material, i.e. mechanical, acoustic, electric and magnetic energy.
Influence of the nanolayer structure of coatings on the cutting properties of tools
Authors: Volosova Marina , Bublikov Jury , Sotova Catherine , Sadov Ilya
Published: November 2020

The paper is focused on the influence of the thickness of nanolayers in the Ti-TiN-(Ti,Cr,Al)N coating on the cutting properties of the tools during the turning of 09G2S silicon-manganese steel. Coatings with the nanolayer thicknesses of 302, 70, and 16 nm were considered. The conducted studies have revealed that a tool with a coating in which the nanolayer thickness is equal to 16 nm demonstrates the longest tool life. At the same time, for such tool, the wear pattern is more balanced, and signs of brittle fracture on the coating are less pronounced. The Ti-TiN- (Ti,Cr,Al)N coating with the nanolayer thickness of 16 nm provides an increase in the tool life by 3.5 times compared to an uncoated tool and by 1.3–1.5 times compared to the tools with the Ti-TiN-(Ti,Cr,Al)N coating with thicker nanolayers.
Providing adaptive properties of the drive of a rotary drilling machine
Authors: Lemesko Mikhail , Deyneka Inessa , Iliev Aleksey
Published: November 2020

The article is devoted to the issue of automatic adjustment of the drilling machine to operating modes close to optimal. Information about the method of automatic control of the rotational drilling process is provided. The essence of the method consists in a special design of the drive, in which the work of the hydraulic motor and the hydraulic cylinder are connected through the working process. As a result of this connection of hydraulic elements, the torque of rotation on the hydraulic motor controls the feed of the hydraulic cylinder. Tuning throttles provide adjustment of modes to the required range of drilling conditions. Depending on the strength of the rock being drilled and the operating conditions of the drilling machine, the drive automatically changes the feed rate, thus ensuring maximum productivity. Several variations of this adaptive drive of the drilling machine are described. A description of the authors development, the drive scheme, and a description of the principle of operation is given. The advantages of the adaptive drive and its disadvantages are shown.
Analysis of the geometry and contact density of globoid gearing
Authors: Vyatkin Aleksandr
Published: November 2020

Globoid worm gears have been widely applied in a range of technological branches in which other types of worm gears are less effective. The main functional indicators which facilitated their popularity include high load capacity and durability, low vibroactivity and small energy losses. As the experience of application and the results of the study of globoid worm gears showed, the level of operational properties of globoid gears is higher than that of the others only if the gearing and technological parameters of their manufacturing are optimally chosen during the design stage. This paper describes a method for estimating the gearing parameters of a globoid gear with an account of the geometry of the elements (the geometry of the teeth of the wheel and the worm thread), namely the calculation of the gap fields in the globoid gearing by means of numerical methods.
Comparative analysis of software products for virtual simulation of electrical circuits
Authors: Bashkirov Alexey , Glotov Vadim , Kostyukov Alexander , Antilikatorov Alexander , Balashov Yuri
Published: November 2020

This article discusses the use of special software products for the design and simulation of the operation of electrical circuits, namely, the most commonly used programs Electronic Workbench and Multisim are compared, their advantages and disadvantages are determined. In the course of the experiments, on the basis of the above presented software systems, the operation of the electrical circuits of the devices of the amplitude diode detector and the low-frequency amplifier was simulated to identify the capabilities of the programs. In the course of the research, a visual table was compiled, thanks to which it is possible to compare the obtained parameters with the reference characteristics taken from real-life devices. The uptime was chosen as a control parameter, the article contains its calculation formula, and the final calculations are given in the table to better substantiate the capabilities of the software products under consideration. At the end of the article, conclusions are presented on the work done, thanks to which it is possible to determine the pros and cons of each of the programs under consideration.
To the problem of computer-aided design of gear-and-leverage mechanisms
Authors: Rivkin Alexey , Sobolev Alexandr , Nekrasov Alexey , Arbuzov Michael
Published: November 2020

The possibilities of using gear-lever mechanisms in modern mechanical engineering are described on the example of three mechanisms from different areas of industry. For practical application, a method of structural and kinematic analysis of gear-lever mechanisms is proposed, implemented using the program module developed by the authors, and an algorithm for kinematic calculation of a gear-lever three-wheeled articulated four-link, as the most common and used in mechanical engineering, is given.
The study of the FDM technology of 3D printing with the use of materials for production tooling
Authors: Koshkina Anastasia , Fedorov Alexander , Morozov Alexander , Karpukhin Evgeny , Poletaeva Yulia
Published: November 2020

The paper presents a comprehensive study of the surfaces of plastic samples (90% polysulfone (PSU) + 10% polycarbonate (PC)) modified with the help of an ultrasonic resonator to reduce friction in contact between the material of aluminum skins and a covering puncheon. Comparative characteristics of surfaces have been obtained, such as: microhardness, coefficient of friction and wear resistance in contact with wrought aluminum alloy D16T.
Evaluation of machining content and labor intensity of manufacturing products of new nomenclature when determining the cost of fulfilling an order at highly specialized machine-building enterprises
Authors: Grigoriev Sergey N. , Dolgov Vitaliy A. , Umnov Pavel I. , Fokin Nikolay N . , Proshkina Olga S.
Published: November 2020

The problem of operational calculation of machining content and labor intensity of manufacturing parts of a new nomenclature, mainly processed by cutting, at highly specialized machine-building enterprises when calculating the technical and economic indicators of the order is considered. The proposed estimation algorithm is based on the operational calculation of the machining content of cutting operations and the calculation of the reduced labor intensity of heat treatment operations, electroplating and lacquer coating, as well as locksmith and control operations.
The study of the hardening process Portland cement`s concrete with bio cementing additives
Authors: Dergunova Elena S. , Goncharova Valeria A. , Romanchukevich Alexey Y. , Goncharova Margarita A.
Published: November 2020

The paper presents the results of studying the hardening processes of concrete based on Portland cement using biocementing additives. Isolated 11 strains of various bacteria were used as dietary supplements. The bacteria were grown at a temperature of 30 °C in an aerated fermenter with a stirrer speed of 550–600 rpm. The morphology of the concrete surface was evaluated before and after the application of the substrate with the nutrient medium; the appearance of a new phase was recorded after 2 weeks. The effect of cementation conditions on the compressive strength of biocemented concrete specimens was studied, and the capillary water`s coefficients absorption were determined.
Cleaning of soybean seeds using the gravity-pneumatic cleaner in the line of production soybean
Authors: Khamyev Victor , Gulyev Anatoly , Adamyan Gaik , Boiko Andrey , Quang Minh Bui
Published: November 2020

The aim of the study is determining the main agricultural technical indicators of the TS-5 gravity-pneumatic cleaner prototype as part of the soybean seed cleaning production line. It was presented the results of research of a evaluation basic indicators of the TS-5 gravitational-pneumatic cleaner in comparison with the basic version of the VIM-3 machine for cleaning soybean seeds. Comparative technical and economic results of the new machine TS - 5 and the basic variant BIM - 3 have been obtained, which allow to conclude that the developed grain cleaning line has shown high technological reliability and resource and energy efficiency.
Überzeugend auf den ersten Klick – Die Praxishomepage erfolgreich gestalten
Authors: Leicher Rolf
Published: November 2020

Wer heute nach einem Physiotherapeuten sucht, greift nur noch selten zu Telefon- oder Branchenbuch. Vielmehr lassen sich Patienten durch Empfehlungen von Bekannten oder immer häufiger von einem guten Internetauftritt von einer Praxis überzeugen. Eine attraktive Website ist damit die beste Möglichkeit, sein Angebot und das Team vorzustellen und sich damit von der Konkurrenz abzuheben.
Standard Changing News Onkologie in der Tumorchirurgie
Authors: Königsrainer Alfred
Published: November 2020

Im Jahr 2020 haben sich bislang durch die Pandemie viele Veränderungen ergeben und die Gesamtheit der Veränderungen sind noch nicht absehbar, dies nicht nur wegen der öffentlichen Beschränkungen sondern vielmehr wegen der vielschichtigen Einflüsse auf den klinischen Alltag aller Patienten und der onkologischen Versorgung im Besonderen. Die Ergebnisse einer internationalen Datenanalyse zeigen auf, dass im Zeitraum der ersten COVID-19-Welle innerhalb von 9 Wochen weltweit ca. 28 Millionen Eingriffe abgesagt oder verschoben werden mussten 1. Für Deutschland lag die Schätzung bei 900 000 abgesagten oder verschobenen Operationen im gleichen Zeitraum. Dies betraf auch onkologische Operationen, wie ganz rezent in einer Analyse aus Abrechnungsdaten im Deutschen Ärzteblatt vom 6. Juli 2020 aufgezeigt wird 2. Das internationale Konsortium, an dem der Autor dieses Beitrages auch beteiligt ist, untersucht des Weiteren die postoperative Komplikationsrate und die perioperative Mortalität bei SARS-CoV-2-infizierten Patienten 3, aber auch die Einflüsse der Pandemie auf die chirurgische Versorgung von Tumorpatienten (Manuskript im Begutachtungsverfahren). Das erschreckend hohe perioperative Risiko, gerade nach größeren Eingriffen mit einer Pneumonierate von nahezu 50 % und einem Risiko von über 20 % innerhalb von 30 Tagen postoperativ zu versterben, erfordern umfassende Maßnahmen sowie eine Triagierung nahezu aller Tumorpatienten 4. Was dies für unsere Patienten im Einzelnen bedeutet, wird sich erst in den kommenden Monaten/Jahren zeigen.

Der Jahresbeitrag beschäftigt sich in diesem Jahr ausschließlich mit dem Pankreaskarzinom und neuen Strategien in der Chirurgie sowie der perioperativen multimodalen Therapie. Zuletzt wird es noch Hinweise zum Management von Vorläuferläsionen wie intraduktaler papillär-muzinöser Neoplasien des Seitengangs (Seitengang-IPMN) geben.
Sitagliptin as an Initial Therapy and Differential Regulations of
Metabolic Parameters Depending on its Glycemic Response in Subjects with Type 2
Diabetes
Authors: Kutoh Eiji , Kuto Alexandra N. , Wada Askuka , Hayashi Jyunka , Kurihara Rumi
Published: November 2020

The aim of this study is to investigate whether sitagliptin can be used as an
initial drug for T2DM and to evaluate its effects on metabolic parameters in
relation to its glycemic efficacies. The subjects received
25−50 mg/day sitagliptin monotherapy (n=69).
At 3 months, they were divided into three groups (n=23 each)
according to the novel parameter called “A1c index” which is
designed to assess glycemic efficacy. The metabolic parameters were compared
between good-responders and poor-responders. These two groups acted as a
control each other. In the overall subjects, efficient reductions of HbA1c
(10.16–8.22%) were observed with few adverse events.
Significant correlations were seen between the A1c index and changes of
(∆)nonHDL-C (R=0.250) or ∆LDL-C (R=0.368).
At baseline, T-C, nonHDL-C and BMI levels were significantly lower in
good-responders than poor-responders. At 3 months, in good-responders, HbA1c
levels effectively decreased (11.03–7.00%). Indexes for
insulin sensitivity/resistance [HOMA-R and 20/(C-peptide x
FBG)] and beta-cell function (HOMA-B and CPR-index) ameliorated. T-C,
nonHDL-C and LDL-C significantly decreased, while BMI increased. However, in
poor-responders, no changes in these parameters were noted. Collectively,
these results suggest that 1) Sitagliptin can be used as a first-line drug
for T2DM and its glycemic efficacy is linked to some atherogenic lipids. 2)
Those with lower T-C, nonHDL-C and BMI appear to respond better with this
drug. 3) Good glycemic efficacy of sitagliptin is medicated through reduced
insulin resistance as well as enhanced beta-cell functions. Body weight
increased, while some atherogenic cholesterol decreased in
good-responders.
Relación de las cinéticas del PSA en la detección de la recurrencia del cáncer de próstata post prostatectomía radical con la 18f-colina tomografía por emisión de positrones/tomografía computada [PET/TC colina (PETC)]
Authors: Bergero Miguel A. , Ríos Liliana , David Carlos , Piccini Carolina A. González , Derian Enria , Fleurquin Marcelo , Costa Lucas , Faccio Fernando
Published: November 2020

Objetivo El objetivo de este estudio es evaluar la relación de las cinéticas del antígeno prostático específico (PSA por su sigla en inglés) con la positividad de la tomografía por emisión de positrones/tomografía computada [PET/TC colina (PETC)]en pacientes con una recaída de cáncer de próstata (RCP).

Materiales y métodos Se realizó un trabajo retrospectivo de 48 pacientes con RCP post prostatectomía radical (PR) evaluados con PETC.

Resultados La PETC negativa tuvo una mediana de 16,3 meses y la PETC positiva de 5,5 meses (p =  < 0,001) para el tiempo de doblaje de PSA (PSADT por su sigla en inglés); la PETC fue positiva en el 96% de los pacientes con un PSADT< 12 meses. La PETC negativa tuvo una mediana de 0,03 ng/ml/año y la PETC positiva de 4,1 ng/ml/año (p =  < 0,001) para la velocidad del PSA (PSAVpor su sigla en inglés); la PETC fue positiva en el 92% de los pacientes con un PSAV > 0,75 ng/ml/año. Lasáreas bajo la curva ROC para PSAV fue de 0,984 con un punto de corte de mayor discriminación de 0.785 ng/ml/año, mostrando razones de verosimilitud (LR por su sigla en inglés) LR +  = 25 y LR-= 0,1. Para PSADT el ROC fue de 0,992 con un punto de corte de mayor discriminación de 11 meses, mostrando LR +  = 11 y LR- = 0.

Discusión El PSA es un indicador inespecífico de PETC positiva. Un estudio inicial demostró que los pacientes con una RCP con una PETC positiva tenían un menor PSADT y una mayor PSAV que los pacientes con una PETC negativa.

Conclusión La positividad de la PETC se vio influenciada por las cinéticas del PSA, observándose que a menor PSADT y que a mayor PSAV mayor fue la probabilidad de la positividad de la PETC.
Accuracy and Reliability of Lung Ultrasound to Diagnose Transient Tachypnoea of the Newborn: Evidence from a Meta-analysis and Systematic Review
Authors: Ma Hai-Ran , Liu Jing , Yan Wen-Kang
Published: November 2020

Objective Transient tachypnoea of the newborn (TTN) is one of the most common causes of neonatal respiratory distress (RD) during the newborn period. Chest radiography (CXR) is commonly used to rule out the diagnosis, but TTN is often misdiagnosed as neonatal respiratory distress syndrome (NRDS) on the basis of CXR alone. Increasing evidence suggests that lung ultrasound (LUS) may be a reliable diagnostic tool for transient tachypnoea of the newborn. However, studies of the diagnostic efficiency of LUS are still lacking. This study was aimed to evaluate the accuracy and reliability of LUS for diagnosing TTN by conducting a systematic review and meta-analysis.

Study Design We searched for articles in the Embase, PubMed, and Cochrane Library databases from inception until May 31, 2020. The selected studies were diagnostic accuracy studies that reported the utility of LUS in the diagnosis of TTN. Two researchers independently extracted data and assessed quality using the Quality Assessment of Diagnostic Accuracy Studies-2 (QUADAS-2) tool. Then, we created a bivariate model of mixed effects to calculate the sensitivity and specificity of LUS in diagnosing TTN. A summary receiver operator characteristic (SROC) curve was constructed to summarize the performance characteristics of LUS.

Results Six studies involving 617 newborns were included in the review. LUS had a pooled sensitivity of 0.98 (confidence interval [CI]: 0.92–1.00) and a specificity of 0.99 (CI: 0.91–1.00). The area under the curve for LUS was 1.00 (0.98–1.0). Meta-regression revealed that LUS had a significant diagnostic accuracy for TTN.

Conclusion The performance of ultrasound for the detection of TTN was excellent. Considering the various advantages of LUS compared with chest radiographs in diagnosing TTN, this study supports the routine use of LUS for the detection of TTN.

Key Points
How does watching YouTube fashion content impact perception of appearance: a phenomenological study of Korean women in Generation Z
Authors: Park Juha , Chun Jaehoon
Published: November 2020

Generation Z grew up in a media-friendly environment, and this study aimed to examine how YouTube influences their perception of appearance. The research followed the methodological procedures of Giorgi’s phenomenology and conducted in-depth interviews of 15 Korean women who were born between 1995 and 2005 and enjoyed watching fashion-related YouTube content. The results showed that Generation Z was greatly influenced by fashion YouTubers and the visual stimuli they provided. They had a positive attitude towards YouTubers, actively participated in online non-face-to-face communication and tried to look like them. Their watching of YouTube fashion content had a variety of influences with regard to their perception of looks and appearance management. Repeated exposure to YouTubers’ slim bodies and appearance-related content led viewers to accept this body type as the ideal. Moreover, appearance-related information provided by YouTubers was being used as indexes of their lifestyles and consumption habits. Though YouTubers’ influence was both positive and negative, Generation Z’s pursuit of their own personalities made YouTube an independent fashion medium that was not affected by space or time.
Discursive (re)construction of populist sovereignism by right-wing hard Eurosceptic parties in the 2019 European parliament elections
Authors: Brusenbauch Meislova Monika , Buckledee Steve
Published: November 2020

The overarching aim of the article is to investigate the discourse of populist sovereignism as articulated by the leaders and/or leading candidates of four right-wing hard Eurosceptic populist parties in the following countries during the 2019 elections to the European Parliament: the Czech Republic, Italy, Slovakia and the United Kingdom. The political parties investigated are Freedom and Direct Democracy, League, People’s Party Our Slovakia and Brexit Party. Using the analytical tools of Critical Discourse Analysis and drawing on the concept of populist sovereignism, the study investigates how right-wing Eurosceptic populist sovereignism was discursively (re)constructed by right-wing hard Eurosceptic parties during the 2019 EP elections across the four cases. As such, the inquiry brings fresh insights as it looks at right-wing populist discourse through the sovereignism perspective, thus complementing the literature on populist mobilization that focuses on grasping the linkage between populism and sovereignism.
Down stair walking: A simple method to increase muscle mass and performance in 65+ year healthy people
Authors: Regnersgaard Signe , Knudsen Anna K. , Lindskov Filippa O. , Mratinkovic Marija , Pressel Eckart , Ingersen Arthur , Dela Flemming
Published: November 2020

Exercise is important for prevention of sarcopenia in the elderly population. We tested two training modalities, ascending or descending stair walking, representing concentric (CON) and eccentric (ECC) exercise, respectively. We also tested the effects of additional weight during eccentric exercise (ECC+). Thirty‐two healthy men and women (70 ± 3 [mean ± SE] yrs.) were randomly assigned to CON, ECC, or ECC+ (carrying +15% of body weight in a vest) in a 3 (n = 32) or 6 (n = 21) week intervention (3 sessions/week). Data was analysed by mixed models approach. Rate of perceived exertion (RPE; Borg scale 6‐20; mean values from 3 and 6 weeks) during training did not differ between CON (12.3 ± 0.4), ECC (11.5 ± 0.3), and ECC+ (11.7 ± 0.4). After 6 weeks, leg muscle mass increased more in ECC+ (+0.29 ± 0.09 kg) vs CON (+0.08 ± 0.05 kg) (P<0.05) but not different from ECC (+0.16 ± 0.06 kg). 6‐minute walk test (6MWT) increased after 6 weeks more (P<0.05) in ECC+ (+85 ± 23 m) compared with ECC (+37 ± 13 m) and CON (+27 ± 12 m). Intramyocellular glycogen content increased from 359 ± 19 nmol/mg d.w. in CON (to 511 ± 65 and 471 ± 44 after 3 and 6 wks, respectfully (P<0.05)), but not in ECC (to 344 ± 28 after 6 weeks) or in ECC+ (to 389 ± 20 after 6 weeks). Conclusion: carrying extra weight while descending stair walking do not increase RPE, but the ECC+ training resulted in greater muscle responses compared with CON, but glycogen synthesis was stimulated only in CON. Descending stairs is a simple model for prevention and treatment of sarcopenia and the stimulus is enhanced by carrying extra weights.
Exploring the non-linear oscillation of a rigid sphere on an elastic half-space
Authors: Kontomaris Stylianos-Vasileios , Malamou Anna
Published: November 2020

The nonlinear behavior characterises a wide range of physical phenomena. Finding solutions that describe the behavior of nonlinear systems with respect to time is usually a challenging procedure. In addition, it is important to express the solutions using elementary functions so they can be easily applied in practical applications. In this paper, an interesting nonlinear oscillation was explored; the oscillation of a rigid sphere on an elastic half-space. A simple methodology based on the conservation of energy was used to find the position of the sphere with respect to time. The data was then fitted to appropriate functions that can be used to describe the behavior of the system with different levels of accuracy. It was found that a Fourier series function is an accurate, yet simple solution to describe the sphere’s behavior. In addition, approximate expressions that relate the period of the motion with respect to the range of displacements was also presented.
Subsurface depth dependence of nitrogen doping in TiO2 anatase: a DFT study
Authors: Kakil Shaida Anwer , Abdullah Hewa Y , Abdullah Tahseen G , Manini Nicola
Published: November 2020

We report first-principles calculations of the structure and electronic structure of nitrogen-doped TiO2 anatase as a function of the dopant depth below the (101) surface. Specifically we evaluate the depth dependence of the formation energy for a few positions of the N impurity, considering for both substitutional and interstitial sites. We find a significant advantage of interstitial over substitutional positions, and a mild dependence of this formation energy on depth. The lengths of the bonds surrounding the impurity also evolve smoothly with depth. Regarding the electronic structure, we report the main features of the intragap impurity states and the hole-related spin magnetization density surrounding the N impurity.
Learning control coil currents from heat-flux images using convolutional neural networks at Wendelstein 7-X
Authors: Pisano Fabio , Cannas Barbara , Fanni Alessandra , Sias Giuliana , Gao Yu , Jakubowski Marcin , Niemann Holger , Puig Sitjes Aleix
Published: November 2020

An important goal of Wendelstein 7-X, the most advanced operating fusion experiment of the stellarator line, is to demonstrate the ability of stellarators to perform steady-state discharges. In this respect, the monitoring and control of the heat loads on the plasma facing components, especially of the strike-lines in the ten island divertors, will be critical during next operation phase OP2. In this paper, it is shown that deep convolutional neural networks are able to learn the relationship between the heat-flux images, obtained by the analysis of thermographic data, and the applied control coil currents in standard magnetic configuration experiments. This study is carried out in view of understanding and modeling the relationship between the heat-flux distribution in the divertor strike-lines and the actuators influencing them.
Microstructure evolution and mechanical properties of Al2O3-40%TiO2 coating by Hybrid-Low Velocity OxyFuel process
Authors: Tailor Satish , Vashishtha Nitesh , Modi Ankur , Modi S C
Published: November 2020

This study presents a new thermal spray coating manufacturing process to deposit high performance ceramic coatings named ‘Hybrid-LVOF’ (Low Velocity OxyFuel). By this process, both thin and thick ceramic coatings can be deposited on metallic or ceramic substrates. In this work, the microstructural and mechanical properties of H-LVOF sprayed Al2O3-TiO2 coatings were compared with plasma sprayed (PS) Al2O3-TiO2 coatings; with the additional condition that typical bond coat was not applied. The α-Al2O3 and γ-Al2O3 contents have been quantified in the as-sprayed coatings. As-sprayed Hybrid-LVOF coatings show better properties than conventional plasma-sprayed coatings including better fracture toughness. Noise and radiation levels are very low in the hybrid-LVOF process. Furthermore, a 50% reduction in overall production cost was achieved. H-LVOF could be therefore a possible alternative to a conventional plasma spray process.
New look at Geiger-Nuttall law and α clustering of heavy nuclei *
Authors: Qian Yi-Bin , Ren Zhong-Zhou
Published: November 2020

The Geiger-Nuttall (GN) law of α decay is commonly explained in terms of the quantum tunneling phenomenon. In this study, we show that such an explanation is actually not enough regarding the α particle clustering. Such a conclusion is drawn after exploring the involved coefficients of the GN law based on the conventional description of α decay, namely the formation of an α cluster and its subsequent penetration. The specific roles of the two former processes, in the GN law, manifest themselves via the systematical analysis of the calculated and experimental α decay half-lives versus the decay energies across the

and

shell closures. The α-cluster preformation probability is then found to behave in a GN-like pattern. This previously ignored point is explicitly demonstrated as the product of an interplay between the mean-field and pairing effect, which in turn reveals the structural influence on the formation of the α cluster in a simple and clear manner. In addition to providing an effective method to evaluate the amount of surface α clustering in heavy nuclei, the present conjecture supports other theoretical treatments of the α preformation probability.
Correlation Analysis of Transformer Parameters Based on Pair-Copula
Authors: Yu Ting , Yang Junjie , Lin JinChen , Geng Chuanping
Published: November 2020

Transformer temperature is an important indicator to detect the operating status of equipment. State evaluation of transformer temperature can analyze whether the equipment is in good operating condition. However, the internal structure of the transformer is complicated and collaborative failures are prone to occur. In addition, different ambient temperatures will also affect the temperature measurement of the equipment itself. Therefore, there are a large number of uncertain factors inside and outside the transformer, resulting in inaccurate temperature analysis. The article introduces the Pair-Copula function model to analyze the correlation of various variables in the transformer system, and combines the rank correlation coefficient to filter the variables, and finally constructs the correlation model of the transformer temperature, which provides an important analysis basis for subsequent state evaluation.
Market-Oriented Consumption Model Based on the Joint Tracking of Renewable Energy Generation Curve of “Shared Energy Storage & Demand Side Resources”
Authors: Liu Dunnan , Zhao Ningning , Xu Xiaofeng , Shao Ping , Cao Xiaojun , Feng Shuhai
Published: November 2020

The fluctuation of renewable energy output brings many challenges to the operation of power system, which also indirectly affects the consumption of renewable energy. This paper proposes a market-oriented consumption model based on “shared energy storage and demand side resources” to track renewable energy generation curve. This paper combs the benefits of each party when participating in the transaction, and gives an example to illustrate how the parties benefit from the transaction. The market transaction mode proposed in this paper can enhance the user’s adaptability to renewable energy output by using energy storage equipment; additionally, it can avoid the risk of building energy storage facilities due to participation in the transaction. This provides a feasible idea for further improving the capacity of renewable energy consumption in China.
Simulation Study on Discharge Process of Negative Polarity in UHV Tower-line Air Gap
Authors: Yue Yishi , Liao Zhenyu , Wang Haiyue , Zou Yanhui , Huang Fuyong , Wang Cheng
Published: November 2020

Carrying out the research on the physical simulation model of the negative polarity discharge process in UHV tower-line air gap is of great significance to the lightning protection of UHV transmission lines. Based on the physical mechanism of negative discharge in long air gap, a physical simulation model including initial corona initiation and streamer development, leader initiation, streamer-leader system development, and final jump is established. The model considers the characteristics of corona initial development, the randomness of the leader path, and the negative development of the negative leader. Finite element software was used to calculate the background potential distribution of the gap, and the experimental observations were used to verify the model established in this paper. Finally, the model was used to simulate the discharge process of the negative polarity in tower-line air gap under actual size of tower window structure. The results show that the simulation calculations agree well with the test results.
Power Generation Curve Clearing Algorithm based on High-Low Match Auction Mechanism
Authors: Shao Ping , Cao Xiaojun , Feng Shuhai , Li Xuesong , Liu Dunnan , Zhao Ningning
Published: November 2020

In the era of power production with coal and gas as the main fuel, the output value of the power system is easy to control and adjust. Therefore, the traditional power trading only focuses on the research of transaction method of electricity quantity. After the addition of clean energy, the output value of power system fluctuates greatly and is difficult to control. At this time, the trading mechanism which only takes electricity as the main factor is no longer applicable. It is necessary to consider adding the fluctuation factors of electricity into the trading process, and use the power of the market to change the purchase decision and electricity consumption habits of users, so that the fluctuation of electricity use curve is consistent with that of power generation curve. Based on the high-low match auction mechanism, this paper designs a clearing rule considering the fluctuation of generation curve, and gives an example to verify it.
Research on the Power Equipment Quality Inspection Industry Based on the Theory of Value Chain: A Case Study of Zhejiang Province
Authors: Zhao Shen , Mao Qianda , Li Changhao , Zhang Shujia , Lv Chao , Zhang Pengyue
Published: November 2020

Power equipment is an important part of power grid construction, and the application of quality inspection industry standards of power equipment is the key to ensuring the safe operation of the power grid. In recent years, Zhejiang Electric Power Company has been subjected to frequent faults due to quality problems of power equipment and delayed feedback of quality inspection. Based on the theory of value chain, this article conducts a study on the power equipment inspection industry, and builds a three-dimensional combined value chain system that integrates “power equipment-quality inspection-power grid operation”. It is of great significance to reduce the security risks of power grid operation in Zhejiang Province and improve the economic and social benefits of Zhejiang Province.
Analysis of Electrothermal Characteristics of Conductive Concrete Foundation of Power Tower
Authors: Tian Xu , Pei Feng , Liu Xin , Jia Lulu , Deng Chenxing , Lan Fen , Cheng Hongbo
Published: November 2020

Conductive concrete has a good application prospect in transmission line tower grounding. The electrothermal effect and thermal stress distribution under lightning current impulse have an important influence on the design, application and maintenance of conductive concrete foundations. Based on the principle of thermoelectric coupling, the lightning current impulse model of conductive concrete foundation under electric-thermal-mechanical coupling is established by using COMSOL Multiphysics. The electric potential distribution, heat distribution and thermal stress distribution of the conductive concrete foundation are simulated and analyzed, and compared with conventional transmission line tower foundation. The simulation results show the conductive concrete foundation, as a natural grounding body, has a better grounding dispersion effect when it is impacted by lightning current, the internal temperature is lower, the thermal stress is smaller, and it has better electrothermal characteristics, which is more suitable for the field of power system grounding engineering without laying grounding body.
Weakening Characteristics of Soft Clay Foundation under Earthquake
Authors: He Yunwu , Peng Xiaogang , Li Youzhi , Jiang Jian , Li Jia
Published: November 2020

The dynamic triaxial test is carried out by the dynamic cyclic shear equipment GDS to determine the strength of soil after earthquake cyclic loading. The consolidation pressure is determined according to the in-situ stress state of soil samples. The samples are loaded with sinusoidal periodic loads of different amplitudes at a fixed frequency, with the failure standard of achieving the same final residual strain. Compared with the static triaxial test results, we can determine the strength weakening of soft clay foundation with different depths under earthquake load, which can provide a reliable reference for engineering problems such as the bearing capacity of pile foundation in soft clay.