bluuebunny/crossref_metadata_2025 huggingface dataset:
Digital transformation of underground mining flow processes: post-event analysis and world’s experience
Authors:   Mining Institute of the Kola Science Center RAS, Gromov Evgenii ,   Murmansk Arctic State University
Published: December 2020

Introduction. The article presents the stages of underground mining transfer from mechanization to automation of basic production processes. Experience of applying various automation levels in local and foreign enterprises has been considered in details. Methodology. The advantages and disadvantages of introducing the digital technologies have been analyzed at almost 30 mines and shafts with underground and integrated methods of mining. Results. It has been determined that in the present time, semiautomatic and autonomous control over particular production processes has become a frequent practice. Main advantages revealed in the course of field trials consist in the ability to operate in inter-shift breaks, in gassy environment, and in higher speed of equipment travel which has made it possible to significantly improve performance. In many mines the staff has been reduced down to 80%, maintenance capital has been reduced down to 60%, performance improved up to 30%, operating costs reduced down to 25%, and service time improved up to 45%. The effect of harmful and hazardous factors on the personnel has significantly reduced due to their occupation mainly in the surface of the mine. Summary. Significant improvement in the efficiency of operation is due to the integrated digitalization and autonomous operation of the whole enterprise which has a single center of information accumulation, data analysis and the flow processes control. It takes time to create an autonomous “digital enterprise” as well as step by step transfer of all production processes in the autonomous operating mode.
Analysis of asymmetry factors in the development of the EU tourism industry
Authors: Polyakov Maxim , Bilozubenko Vladimir , Nebaba Natalia , Korneyev Maxim , Saihak Yelyzaveta
Published: December 2020

The effects of the economic recession and the COVID-19 crisis call for more active support for the tourism industry. To pursue a supranational tourism policy and create a favorable marketing environment at the national level, it is necessary to consider the objective differences between member states and their characteristics in the field of tourism. This study aims to highlight the main factors that characterize the asymmetry of the tourism industry in the EU countries, which allows ensuring the competitiveness of national tourism companies through the formation of an appropriate marketing strategy. The research methodology includes calculation of the asymmetry coefficient and cluster and classification analysis based on Eurostat data.At the first stage, 27 indicators were selected that characterize the structural proportions of the tourism industry and the intensity of tourism in the EU countries. Based on the calculation of the asymmetry coefficient, a high level of heterogeneity of the tourism industry parameters in the EU countries for each of the indicators was demonstrated. At the second stage, clustering (algorithm – k-means, metric – Euclidean distance) of the EU countries was carried out according to the selected indicators. As a result, eight clusters were obtained, which showed asymmetry in developing national tourism sectors in the EU. At the third stage, as a result of classification (method – decision trees), seven combinations of indicators were identified, which completely distinguish the resulting clusters of the EU countries. The parameters included in these combinations are, in fact, the main factors of the asymmetry in the development of the EU tourism industry.Based on the analysis of the asymmetric development of the tourism industry by country, it is possible to determine its growth points and competitiveness drivers in the EU internal market and identify marketing strategies.
Phyto-Facilitated Bimetallic ZnFe2O4 Nanoparticles via Boswellia carteri: Synthesis, Characterization, and Anti-Cancer Activity
Authors: Imraish Amer , Al-Hunaiti Afnan , Abu-Thiab Tuqa , Ibrahim Abed Al-Qader , Hwaitat Eman , Omar Asma
Published: December 2020

Background:

The growing dissatisfaction with the available traditional chemotherapeutic agents has
enhanced the need to develop new methods for obtaining materials with more effective and safe anti-cancer
properties. Over the past few years, the usage of metallic nanoparticles has been a target for researchers of
different scientific and commercial fields due to their tiny sizes, environment-friendly properties, and a wide
range of applications. To overcome the obstacles of traditional physical and chemical methods for the synthesis
of such nanoparticles, a new, less expensive, and eco-friendly method has been adopted using natural existing
organisms as a reducing agent to mediate the synthesis of the desired metallic nanoparticles from their
precursors, a process called green biosynthesis of nanoparticles.

Objective:

In the present study, zinc-iron bimetallic nanoparticles (ZnFe2O4) were synthesized via an aqueous
extract of Boswellia carteri resin mixed with zinc acetate and iron chloride precursors, and they were tested for
their anticancer activity.

Methods:

Various analytic methods were applied for the characterization of the phyto synthesized ZnFe2O4, and
they were tested for their anticancer activity against MDA-MB-231, K562, MCF-7 cancer cell lines, and normal
fibroblasts.

Results:

Our results demonstrate the synthesis of cubic structured bimetallic nanoparticles ZnFe2O4 with an
average diameter of 10.54 nm. MTT cytotoxicity assay demonstrates that our phyto-synthesized ZnFe2O4
nanoparticles exhibited a selective and potent anticancer activity against K562 and MDA-MB-231 cell lines with
IC50 values 4.53 μM and 4.19 μM, respectively.

Conclusion:

In conclusion, our biosynthesized ZnFe2O4 nanoparticles show a promising, environmentally
friendly, and low coast chemotherapeutic approach against selective cancers with a predicted low adverse side
effect toward normal cells. Further, in vivo, advanced animal research should be done to execute their
applicability in living organisms.
El archivo como obra total. Amancio Williams y la construcción de su memoria
Authors: Müller Luis
Published: December 2020

El Archivo Amancio Williams constituye un extraordinario recurso para la investigación, imprescindible para todo aquél que pretenda interpretar al arquitecto y su obra. A lo largo de toda su vida profesional, Amancio Williams reunió una formidable cantidad de información en dibujos, borradores, planos, documentos, cartas y otros materiales que representan la totalidad de su trabajo. La reciente donación del archivo completo al Canadian Centre for Architecture (CCA) abre nuevas perspectivas para ampliar y difundir su legado. 
The Effect of Intellectual Capital Performance on Company's Financial Performance
Authors: Pramathana Bella , Widarjo Wahyu
Published: December 2020

This study analyzes the effect of intellectual capital performance on the company's financial performance in the current year and the following year. We use the Modified Value Added Coefficient (MVAIC) to measure the performance of company's intellectual capital. The research sample is companies listed on the Indonesia Stock Exchange (BEI) 2015-2017 which are included in the High-IC intensive industries category based on the classification of the Global Industries Classification Standard (GICS). Samples were obtained using purposive sampling technique in order to obtain 112 companies with a total of 336 observations. The data analysis technique was conducted by using panel data regression. This study results indicate that intellectual capital performance has positive and significant effect on the company's financial performance for the current year. However, it does not significantly affect the company's financial performance in the following year. This study contributes to the accounting literature development, especially the important role of intellectual capital in improving financial performance of company.
SIMULATION OF DATA TRANSMISSION SYSTEM WITH ADAPTIVE SELECTION OF AN ERROR-CORRECTING CODE BASED ON COMMUNICATION CHANNEL STATE ASSESS-MENT
Authors:   I.V. Kochetova Pacific State University, Kochetova I.V. , Levenets A.V. ,   A.V. Levenets Pacific State University
Published: December 2020

The article proposes a simulation model of an adaptive system for transmitting discrete messages, in which information about the state of the communication channel is used to set the parameters of an error-correcting code, which makes it possible to operate the bandwidth of the communication channel and optimize the performance of data transmission equipment. An assessment of the efficiency of cer-tain error-correcting coding methods in a simulated system with respect to the value Eb/No is carried out. The model makes it possible to estimate such parameters as the weight of transmitted messages, the number of repeated messages through the feedback channel for a given value of Eb/No.
METHODOLOGY FOR DETERMINING SPEED COEFFICIENTS IN THE DESIGN OF RADIAL-AXIAL TURBINE
Authors:   A.V. Passar Computing center of Feb RAS, Passar A.V. , Timoshenko D.V. ,   D.V. Timoshenko Computing center of Feb RAS, Faleeva E.V. ,   E.V. Faleeva Computing center of Feb RAS
Published: December 2020

The article proposes a method for the interrelated determination of the speed coefficients and optimal geometry of a radial-axial centripetal turbine flow range. The method is based on a model of gas flow at an average diameter in a one-dimensional quasi-stationary approximation, supplemented with ratios to determine the optimal operating parameters of the turbine.
IMPLEMENTATION AND COMPUTER MODELING OF DISTURBANCE COMPENSATION ALGORITHMS FOR PROGRAMMABLE LOGICAL CONTROLLERS
Authors:   A.N. Rybalev Amur state university, Rybalev A.N.
Published: December 2020

The paper proposes approaches to the software implementation of disturbance compensation systems on programmable logic controllers (PLCs) and to the testing of synthesized systems on combined models, including a simulation model of the controlled unit and a virtual controller. Separate examina-tion is given to a case when the theoretically calculated compensator is impracticable
SEARCH METHODS IN THE STRATEGY OF OPERATING HIGH-DUTY TECHNICAL SYS-TEMS
Authors:   G.B. Digo Institute of automation & control processes FEB RAS, Digo G.B. , Digo N.B. ,   N.B. Digo Institute of automation & control processes FEB RAS
Published: December 2020

nical systems. Discussed are the difficulties in estimating and predicting their technical condition, that are caused by the lack of information about regular patterns of random processes of parametric varia-tion, unavailability or lack of information about disturbing effects and the impact of external factors on the ongoing processes. The authors demonstrate feasibility of reducing the method of controlling the operation of unique high-duty technical systems to the decision-making problem under conditions of uncertainty with a guaranteed result. The application of search optimization algorithms that do not use information about the derivatives of optimized functions and allow parallelization of computation-al processes is considered.
EVALUATION OF TRIBOTECHNICAL PROPERTIES OF THE COATING OBTAINED BY ELECTRIC SPARK HARDENING
Authors:   Federal Scientific Agroengineering Center VIM, ROMANOV IL’YA , ZADOROZHNIY ROMAN
Published: December 2020

When applying coatings using various methods on the surfaces of moving parts that work in joints, it is important to make sure that the coatings are strong and wear-resistant in order to return them to their original resource. All existing hardening technologies and materials used to perform coatings have their own characteristics, therefore, the quality of the resulting coatings can be judged only after specific tests. (Research purpose) The research purpose is in evaluating the properties of the coating obtained by the method of electric spark hardening, and its ability to resist friction and mechanical wear. (Materials and methods) Authors conducted tests on the basis of the "Nano-Center" center for collective use. A coating was applied on the BIG-4M unit with a VK-8 hard alloy electrode, tribological properties were evaluated on a CSM Instruments TRB-S-DE-0000 tribometer, the width of the friction track was measured after the test using an inverted OLYMPUS gx51 optical microscope, and samples were weighed before and after the test on a VLR-200 analytical balance. Conducted research in accordance with GOST 23.224-86 and RD 50-662-88 guidelines. (Results and discussion) The article presents performed tests on the run-in and wear resistance of the coating. The samples were worked on with a step-by-step increase in the load. During the tests, the friction force was drawed on the diagram. Authors compared the results with the reference sample, an uncoated surface. (Conclusions) The resulting coating has better run-in and wear resistance compared to the standard, and the increase in wear resistance in dry friction conditions is very significant.
RESTORATION OF MACHINE PARTS WITH GALVANIZED ZINC COATINGS
Authors:   Russian State Agricultural Correspondence University, VIKHAREV MIKHAIL , YUDIN VLADIMIR , NIKOLAY VESELOVSKIY ,   Bauman Moscow State Technical University,   Bauman Moscow State Technical University
Published: December 2020

The article shows the role of electroplating in the restoration of parts, indicates the advantages of restoring parts with electroplating over other methods, and gives the characteristics and properties of coatings obtained by electroplating. (Research purpose) The research purpose is in increasing the speed of application of zinc electroplating when restoring parts. (Materials and methods) The cathode current density has a decisive influence on the coating speed. The main reason for limiting the cathode current density during galvanizing from sulfuric acid electrolytes is the chemical polarization of the cathode. The article presents a study on the designed installation for the application of galvanic coatings. When applying coatings to the internal surfaces of parts, there was used a device with activating elements having an electromechanical rotation drive. This device prevents depletion of the near-cathode layer of the electrolyte and reduces the chemical polarization of the cathode. Elements made of moisture-resistant skin were used as activators. (Results and discussion) The article presents the results of experiments as a dependence of the coating speed on the speed of the activator relative to the restoring surface. It also presents the relationship between the size of the abrasive grains of the activating elements, the force of their pressing against the cathode surface, the speed of movement of the activator and the speed of applying the zinc coating, as well as its quality. By activating the cathode surface, it was possible to raise the operating current density to 100-150 amperes per square decimeter. The speed of application of zinc coatings is 16-25 micrometers per minute. (Conclusions) In the course of research, authors determined the conditions of electrolysis during galvanizing, which provide a significant increase in the cathode current density and the rate of application of these coatings during the restoration of parts.
10.22314/2618-8287-2020-58-4-148-156
Authors:   Federal Scientific Agroengineering Center VIM, ROMANOV ILYA , ZADOROZHNIY ROMAN
Published: December 2020

Among the well-known repair technologies for restoring bronze parts, there are practically no technologies using metal powders from non-ferrous metals. Electroerosive dispersion is an energy-efficient process that makes it possible to obtain powdered copper and bronze from machine-building waste with lower costs and environmental impact. (Research purpose) The research purpose is in evaluating the physical and mechanical properties of bronze powders obtained by electroerosive dispersion from machine-building waste, and justifying the possibility of their application in the technologies of repair and restoration of parts. (Materials and methods) Authors received material for research on their own experimental facilities of the Nano-Center Central Research Center. Authors used an inverted metallographic microscope Olympus GX-51, a TESCAN VEGA II scanning electron microscope with an INCA Energy 350 X-ray spectral analysis system, a Microtrac Bluewave laser particle size analyzer, a Niton XL3t GOLDD+ X-ray fluorescence spectrometer, and a KMT-1 microhardness meter. (Results and discussion) The article presents qualitative and quantitative indicators of the bronze powder obtained by electroerosive dispersion, and the properties of this powder were evaluated for a specific method of production. The article presents granulometric composition of the powder, the shape and morphology of the particles, the fractional composition, microhardness and chemical composition. (Conclusions) In the studied powder, particles with a regular spherical shape prevail. The decrease in microhardness is explained by the recrystallization process. Differences in the chemical composition are explained by the interaction with the working fluid and various elements of the installation structure. Powder material obtained from bronze waste by electroerosive dispersion mostly corresponds to the parameters of the source metals and is suitable for the restoration and repair of parts.
INFLUENCE OF TWO-LAYER COATINGS OF THE “DLC + TIN / ALTIN” ON THE TRIBOLOGICAL PROPERTIES OF OILS UNDER BOUNDARY LUBRICATION
Authors:   Blagonravov Mechanical Engineering Research Institute of Russian Academy of Sciences, BUYANOVSKIY IL’YA , SAMUSENKO VLADIMIR , SHCHERBAKOV YURIY , STREL’NIKOVA SOF’YA , LEVCHENKO VLADIMIR ,   Lomonosov Moscow State University
Published: December 2020

The application of monocrystalline carbon to steel surfaces of rubbing bodies significantly increases the anti-friction and anti-wear properties of lubricants. (Research purpose) The research purpose is in choosing the optimal intermediate layer material based on the evaluation and comparison of the physical, mechanical and tribological characteristics of two-layer coatings obtained using titanium nitride and titanium aluminitride, respectively, as a solid intermediate layer, and compare them with each other. (Materials and methods) The cylindrical surfaces of 100Cr6 steel rollers with a diameter of 8 mm were coated with titanium nitride and titanium alumonitride, using the latest technologies, and on top of these coatings by pulsed condensation of carbon plasma with additional bombardment with argon ions - monocrystalline carbon. The micromechanical and microgeometric characteristics of the studied surfaces were evaluated using NanoScan-4D and SNeox devices. Pure base oil PAO-4, oil with the addition of oleic acid as a surface-active additive, and zinc dialkyldithiophosphate as a chemically active additive were used as a lubricant. (Results and discussion) The use of intermediate layers of titanium nitride and titanium aluminitride improves the adhesion of the carbon coating, which has a positive effect on its wear resistance. The main role in the antifriction effect of two-layer coatings is performed by a thin-layer carbon coating. (Conclusions) The article shows that the use of composite coatings from monocrystalline carbon + heat-resistant coating in friction units operating in the boundary lubrication mode serves as a reserve for improving the lubricating properties of oils, without requiring chemically active additives containing elements that negatively affect the environment. As an intermediate coating, the best result was shown by titanium aluminitride, it is more resistant to wear, and also provides lower friction.
ХАРАКТЕР ИЗМЕНЕНИЯ ГЛУБИНЫ ЛУЧЕВИДНОГО ИЗНОСА ПРИ РАЗЛИЧНЫХ ВАРИАНТАХ АРМИРОВАНИЯ ДОЛОТООБРАЗНОЙ ОБЛАСТИ ЛЕМЕХОВ ПРИ ВСПАШКЕ ТЯЖЕЛЫХ ПОЧВ
Authors:   Bryansk State Agrarian University, MIKHAL’CHENKOV ALEKSANDR , KOZHUKHOVA NELLI , TYUREVA ANNA , LUZIK VASILIY
Published: December 2020

During the operation of the plow body, a number of defects are formed on the bit-shaped part of the plowshare, one of which is xiphoid wear. Renewing the life of a given part is often reduced to eliminating such wear in various ways that are not always rational. This occurs due to insufficient knowledge of the dynamics of xiphoid wear, especially little information about plowing heavy soils. (Research purpose) The research purpose is in identifying the nature of changes in the depth of xiphoid wear in various options for reinforcing the chisel-shaped area of ploughshares when plowing heavy soils. (Materials and methods) Authors conducted research using all-metal ploughshares of domestic production in the state of delivery and reinforced according to the schemes of the location of reinforcing rollers. The reinforcement rollers were formed using E42A-UONII-13/45 electrodes designed for welding carbon steels. The thickness in the area of the ploughshare wear was determined using a calibration plate, prisms, and an indicator micrometer with an accuracy of 0.01 millimeters. To ensure the same conditions of the experiment, it was carried out in fields where the soils had the same granulometric composition, which was loam with a physical clay content of 33-38 percent. (Results and discussion) The article reveals dynamics of the development of the xiphoid wear depth depending on the operating time and technological methods of strengthening reinforcement of the chisel-shaped part of the ploughshare. The article describes the technology of strengthening reinforcement that provides the minimum wear depth with the same operating time. (Conclusions) The article presents a method for determining the depth of xiphoid wear. The proposed technology of reinforcement of ploughshares with rollers perpendicular to the field edge, with surfacing of the buried part to a length of 100 millimeters and reinforcement of the heel will increase the resource of the part by 1.3 times.
Organizational Citizenship Behavior and Emotional Intelligence of EFL Teachers in Saudi Arabia: Implications to Teaching Performance and Institutional Effectiveness
Authors: C. Meniado Joel
Published: December 2020

Many studies have extensively investigated the antecedents, consequences, and relationships of Organizational Citizenship Behavior (OCB) and Emotional Intelligence (EI) in corporate and industrial settings, but not in educational contexts particularly in the field of English language teaching. To expand the existing literature in OCB and EI, this study investigated the levels and relationship of OCB and EI of college English teachers in an English language institute in the western region of Saudi Arabia. It tried to answer the following research questions: 1) What is the level of OCB and EI of the respondents? 2) Is there a significant relationship between the respondents’ OCB and EI? Using descriptive correlational research design with adapted organizational citizenship behavior and emotional intelligence scales as data gathering instruments, this study found that the respondents had very high level of OCB. Specifically, the findings revealed that the OCBs under altruism, civic virtue, and compliance dimensions were rated as very high while those under sportsmanship and courtesy were assessed as high. Findings also indicated that the EFL teachers had high level of EI. Lastly, the study proved that there was a significant, positive relationship between the respondents’ organizational citizenship behaviors and emotional intelligence. Based on the findings, the study concludes that the respondents have the potential to excel in their job and are able to contribute to overall institutional effectiveness. This asset should be enriched and sustained by implementing more relevant OCB/EI-friendly policies and practices that support conducive school climate, transformational leadership, and emotional well-being.
A Developmental Step in the Right Direction: The Case for Concept-Based Instruction in the Omani ESP Classroom
Authors: Ahmed Amer , Lenchuk Iryna
Published: December 2020

This article reports on the results of action research conducted in a university ESP classroom in Oman. The impetus for this research was the practitioner’s dissatisfaction with the current practice of introducing the grammatical concept of the English passive and its subsequent results. Framed within the sociocultural theory of cognitive development, this paper investigates the effectiveness of concept-based instruction (CBI). As a pedagogical approach, CBI targets a learner’s internalization of the concept of a language constituent that assists the learner with the meaning making abilities of sentences where the English passive is used. Twenty-two university students enrolled in an ESP course participated in the study. The data was collected through the teacher’s observations, students’ artifacts, and students’ feedback on the effectiveness of CBI. Data analysis reveals the effectiveness of CBI in heightening learner awareness of the concept of a language constituent, developing learner knowledge of the English passive, and improving their meaning-making abilities at the phrasal and sentential levels.
Representing Kingdom’s Makeover after Vision 2030: A Corpus-Driven Analysis of American Media Discourse
Authors: Hameed Ansa , Jabeen Ismat , Afzal Naeem
Published: December 2020

Saudi Vision 2030 is a scheme; the Kingdom of Saudi Arabia has formulated to realize its mainstream economic, social, and administrative goals. Accordingly, the Kingdom strategizes to implement this transformative Vision. The current research aims to analyze how American media has reported several events, actions, and policies in line with Saudi Vision 2030. Thus, the question posed is how an image of the transformative Saudi Kingdom has been presented by American media discourse, in line with Vision 2030. The study is substantial for the Kingdom to ascertain how the world has responded to its Vision. Moreover, in a world with media as a dominant directing agency, it is imperious for the Kingdom to keep an eye on its image in the global community. The research is primarily a quantitative study based on the corpus approach to study the designated media discourse. A specialized corpus of 150,000 words is compiled and analyzed through a variety of corpus tools. The results reveal that American newspapers have given limited representation of the Vision and related activities. Their media usually highlights the pre-existing features of the Kingdom. On the other hand, there are very occasional references to some new aspects like the transformation of the economy, promotion of tourism, revision of the society, etc., which are being implemented in the Kingdom. The study suggests that the Kingdom needs to brief the Western world for an enriched campaign of its contemporary image.
“Sin luz al final de mi túnel”. Un enfoque narrativo en torno al profesorado interino de Educación Física de larga duración
Authors: González-Calvo Gustavo
Published: December 2020

En este artículo se exploran las vivencias y particularidades a las que se enfrenta el profesorado interino de larga duración (más de quince años en la profesión) que opta, sin aparente éxito, a la consecución de una plaza fija dentro de la enseñanza pública. Estos docentes se enfrentan a una precaria situación caracterizada por un clima neoliberal, lleno de incertidumbres y con evidentes repercusiones sobre su vida personal y profesional. Siguiendo una metodología narrativa se indaga en el modo en que estos docentes van construyendo y legitimando ciertas concepciones en torno al sistema de acceso a la docencia. Los resultados, organizados en torno a una ficción narrativa que toma como referente el día a día de un opositor de larga duración, sugieren la necesidad de (re)pensar un cambio de paradigma de acceso a la profesión docente que permita minimizar la erosión personal y profesional a la que estos profesionales se ven sometidos.
Aspects Regarding the Online Modular Education System Compared with the Classical Onsite System
Authors: Bogdan Maria , Bucur Bogdan
Published: December 2020

In according with the situation created by the pandemics of the world [4,6,7,8,9,10], the Covid-19 viruses were affected the all fields of activity from the all domains, like as: industrial domains, tourism, commercial, even of the educational system at all levels [1,2]. In this context our university, George Emil Palade University of Medicine, Pharmacy, Science and Technology of Targu Mures, it had to move from the classical educational system to approach of the new online modular system. This forced adaptation presents a lots of problems, especially of the all specializations within the Faculty of Engineering and Information Technology, where there are practical activities that involve laboratories with practical execution they cannot be performed by the online system. After an experience gained of almost 4 months of online activity, more several negative aspects are configured to be analyzed in order to find constructive solutions for optimizing the online educational system [1]. The present paper proposes to identification of a questionnaire addressed for the students as well as to the teachers from the Faculty of Engineering and Information Technology of UMFST “G.E.Palade” of Tg.Mures. Following the analysis of the all results of the questionnaire, the deficiencies of the problems raised by the technical disciplines that require phisicals practical applications in laboratory classes will be identified, respectively new directions for the development of modular online education will be identified representing the only alternative of the onsite classic education in this situation.
Effects of Long-Term Feeding of Treated Rapeseed Meal on Growth Performance, Blood Mineral Profile and Fatty Acid Composition of Back Fat in Pigs
Authors: Bujňák L. , Naď P. , Skalická M. , Marcinčák S.
Published: December 2020

This experiment was conducted to evaluate the effects of replacing soybean meal (SBM) with treated rape-seed meal (tRSM) on the growth performance, blood mineral levels and fatty acid composition of back fat in growing-finishing pigs. A total of 12 crossbred pigs (Slovakian White × Landrace) with an initial live weight of 40.82 ± 2.69 kg were divided into two dietary treatments. The experimental period lasted 84 days; 38 days in the growing period and 46 days in the finishing period. The dietary treatments were as follows: control, a SBM-based diet (growing and finishing), and experimental, a treated RSM-based diet (growing and finishing). The rapeseed meal was treated with a product that neutralizes the negative physiological effects of anti-nutritive glucosinolates contained in rapeseed products for livestock feeding. Our analysis showed minor, no significant negative effects of tRSM on live weight, average daily gain and feed conversion ratio. Replacing SBM with tRSM had no significant effects on the proportion of the total saturated, monounsaturated and polyunsaturated fatty acids of back fat samples, as well as concentrations of analysed serum minerals except zinc level. In conclusion, the inclusion of 25 % and 18 % of treated RSM in growing and finishing pig diets had no negative effects on the growth performance, blood mineral profile or fatty acid composition of back fat.
The realization of the genetic potential of seed productivity of new oil flax varieties considering the modern resource-saving technologies of the Southern Federal District of the Russian Federation
Authors:   V.S. Pustovoit All-Russian Research Institute of Oil Crops (VNIIMK), Bushnev A.S. , Luchkina T.N. ,   Don experimental station (DOS) – a branch of the V.S. Pustovoit All-Russian Research Institute of Oil Crops, Orekhov G.I. ,   V.S. Pustovoit All-Russian Research Institute of Oil Crops (VNIIMK)
Published: December 2020

Due to the development of new promising varieties of oil flax, the role or research aimed at developing zonal technologies for crop cultivation that contribute to the full realization of its genetic potential is increasing. The objects of research were the varieties of breeding of V.S. Pustovoit All-Russian Research Institute of Oil Crops (VNIIMK 620, Rucheyok, FLIZ, VNIIMK 620 FN, RFN) and its branches: the Don experimental station (Nebesny, Raduga, Avangard, Svetlyachok) and the Siberian experimental station (Sokol, Avgust). The work is aimed at developing the application methods of herbicides permitted for the use on oil flax in the zone of insufficient moistening in the Southern Federal District of Russia in resourcesaving technologies. In the course of research, we revealed that the varieties of the Don experimental station Raduga, Avangard and Svetlyachok were the most adapted to the cultivation conditions of the zone of insufficient moistening. We established that in most cases the separate application of herbicides contributes to obtaining a higher yield of oil flax variety Raduga than when using the tank mixture of herbicides. We obtained the best results with the separate application of herbicides Secator Turbo and Miura (1.52 t/ha) and Tifi and Miura (1.51 t/ha), when the crop yield was comparable to the control under manual weeding (1.54 t/ha). Regardless of the application method, the herbicides contributed to a decrease in the oil content of flax seeds, to the greatest degree while using the tank mixtures, especially in case of application of Magnum and Herbitox in combination with Miura – by 0.9-1.2 %. Therefore, to increase the yield and quality of oil flax seeds in a zone of insufficient moistening in the south of Russia, it is necessary to use the separate application of herbicides Secator Turbo, OD (0.1 l/ha) and Miura, EC (1.2 l/ha) or Tifi, WDG (0.025 kg/ha) and Miura, EC (1.2 l/ha) on the crop sowings in the phase of leaf development.
Computational Study of Inverted All-Inorganic Perovskite Solar Cells Based on CsPbIxBr3-X Absorber Layer with Band Gap of 1.78 eV
Authors: Martínez Nahuel , Pinzón Carlos , Casas Guillermo , Alvira Fernando , Cappelletti Marcelo
Published: December 2020

All-inorganic perovskite solar cells (PSCs) with inverted p-i-n configuration have not yet reached the high efficiency achieved in the normal n-i-p architecture. However, the inverted all-inorganic PSC are more compatible with the fabrication of tandem solar cells. In this work, a theoretical study of all-inorganic PSCs with inverted structure ITO/HTL/CsPbIxBr3−x/ETL/Ag, has been performed by means of computer simulation. Four p‐type inorganic materials (NiO, Cu2O, CuSCN and CuI) and three n-type inorganic materials (ZnO, TiO2 and SnO2) were used as hole and electron transport layers (HTL and ETL), respectively. A band gap of 1.78 eV was used for the CsPbI x Br3−x perovskite layer. The simulation results allow identifying that CuI and ZnO are the most appropriate materials as HTL and ETL, respectively. Additionally, optimized values of thickness, acceptor density and defect density in the absorber layer have been obtained for the ITO/CuI/CsPbI x Br3−x /ZnO/Ag, from which, an optimum efficiency of 21.82% was achieved. These promising theoretical results aim to improve the manufacturing process of inverted all-inorganic PSCs and to enhance the performance of perovskite–perovskite tandem solar cells.
Probing the Structural Features and the Micro-heterogeneity of Various Deep Eutectic Solvents and their Water Dilutions by the Photophysical Behaviour of Two Fluorophores
Authors: Tiecco Matteo , Di Guida Irene , Gentili Pier Luigi , Germani Raimondo , Bonaccorso Carmela , Cesaretti Alessio
Published: December 2020

The structural features of a series of diverse Deep Eutectic Solvents (DESs) have been investigated and characterized by means of two fluorescent probes. The spectral and photophysical properties of the latter are strictly dependent on the experienced environment, so that they can provide insights into the polarity, viscosity, hydrogen-bond network, and micro-heterogeneity of the various DESs.In fact, the investigated DESs exhibit a variety of properties with regards to their hydrophilicity, acidity, and hydrogen-bond ability, and these details were deeply probed by the two fluorescent molecules. The effect of the addition of water, which is a key strategy for tuning the properties of these structured systems, was also tested. In particular, the excited state dynamics of the probes, measured by femtosecond-resolved transient absorption, proved instrumental in understanding the changes in the structural properties of the DESs, namely reduced viscosity and enhanced heterogeneity, as the water percentage increases. Differences between the various DESs in terms of both local microheterogeneity and bulk viscosity also emerged from the peculiar multi-exponential solvation dynamics undergone by the excited states of the probes.
Long-Term Stable Metal Organic Framework (MOF) Based Mixed Matrix Membranes for Ultrafiltration
Authors: Al-shaeli Muayad , Smith Stefan J. D. , Jiang Shanxue , Wang Huanting , Zhang Kaisong , Ladewig Bradley P.
Published: December 2020

In this study, novel mixed matrix polyethersulfone (PES) membranes were synthesized by using two different kinds of metal organic frameworks (MOFs), namely UiO-66 and UiO-66-NH2. The composite membranes were characterised by SEM, EDX, FTIR, PXRD, water contact angle, porosity, pore size, etc. Membrane performance was investigated by water permeation flux, flux recovery ratio, fouling resistance and anti-fouling performance. The stability test was also conducted for the prepared mixed matrix membranes. A higher reduction in the water contact angle was observed after adding both MOFs to the PES and sulfonated PES membranes compared to pristine PES membranes. An enhancement in membrane performance was observed by embedding the MOF into PES membrane matrix, which may be attributed to the super-hydrophilic porous structure of UiO-66-NH2 nanoparticles and hydrophilic structure of UiO-66 nanoparticles that could accelerate the exchange rate between solvent and non-solvent during the phase inversion process. By adding the MOFs into PES matrix, the flux recovery ratio was increased greatly (more than 99% for most mixed matrix membranes). The mixed matrix membranes showed higher resistance to protein adsorption compared to pristine PES membranes. After immersing the membranes in water for 3 months, 6 months and 12 months, both MOFs were stable and retained their structure. This study indicates that UiO-66 and UiO-66-NH2 are great candidates for designing long-term stable mixed matrix membranes with higher anti-fouling performance.
Non-Covalent Interactions Atlas Benchmark Data Sets 3: Repulsive Contacts
Authors: Kříž Kristian , Nováček Martin , Řezáč Jan
Published: December 2020

The new R739×5 data set from the Non-Covalent Interactions Atlas series (www.nciatlas.org) focuses on repulsive contacts in molecular complexes, covering organic molecules, sulfur, phosphorus, halogens and noble gases. Information on the repulsive parts of the potential energy surface is crucial for the development of robust empirically parametrized computational methods. We use the new data set of highly accurate CCSD(T)/CBS interaction energies to test existing DFT and semiempirical quantum-mechanical methods. On the example of the PM6 method, we analyze the source of the error and its relation to the difficulties in the description of conformational energies, and we also devise an immediately applicable correction that fixes the most serious uncorrected issues previously encountered in practical calculations.
Imaging Reversible Mitochondrial Membrane Potential Dynamics with a Small Molecule, Permeable, Internally Redistributing for Inner Membrane Targeting Rhodamine Voltage Reporter
Authors: Klier Pavel , Martin Julia , Miller Evan
Published: December 2020

Mitochondria are the site of aerobic respiration, producing ATP via oxidative phosphorylation as protons flow down their electrochemical gradient through ATP synthase. This negative membrane potential across the inner mitochondrial membrane (ΔΨm) represents a fundamental biophysical parameter central to cellular life. Traditional, electrode-based methods for recording membrane potential are impossible to implement on mitochondria within intact cells. Fluorescent ΔΨm indicators based on cationic, lipophilic dyes are a common alternative, but these indicators are complicated by concentration-dependent artifacts and the requirement to maintain dye in the extracellular solution to visualize reversible ΔΨm dynamics. Here, we report the first example of a fluorescent ΔΨm reporter that does not rely on ΔΨm-dependent accumulation. We re-directed the localization of a photoinduced electron transfer (PeT)-based indicator, Rhodamine Voltage Reporter (RhoVR), to mitochondria by masking the carboxylate of RhoVR 1 as an acetoxy methyl (AM) ester. Once within mitochondria, esterases remove the AM-ester, trapping RhoVR inside of the mitochondrial matrix, where it can incorporate within the inner membrane and reversibly report on changes in ΔΨm. We show that this Small molecule, Permeable, Internally Redistributing for Inner membrane Targeting Rhodamine Voltage reporter, or SPIRIT RhoVR, localizes to mitochondria across a number of different cell lines and responds reversibly to changes in ΔΨm induced by exceptionally low concentrations of the uncoupler FCCP without the need for exogenous pools of dye (unlike traditional, accumulation-based rhodamine esters). SPIRIT RhoVR is compatible with multi-color imaging, enabling simultaneous, real-time observation of cytosolic Ca2+, plasma membrane potential, and reversible ΔΨm dynamics.
A Small Molecule – Protein Hybrid for Voltage Imaging via Quenching of Bioluminescence
Authors: Benlian Brittany , Klier Pavel , Martinez Kayli , Schwinn Marie , Kirkland Thomas , Miller Evan
Published: December 2020

We report a small molecule enzyme pair for optical voltage sensing via quenching of bioluminescence. This Quenching Bioluminescent Voltage Indicator, or Q-BOLT, pairs the dark absorbing, voltage-sensitive dipicrylamine with membrane-localized bioluminescence from the luciferase NanoLuc (NLuc). As a result, bioluminescence is quenched through resonance energy transfer (QRET) as a function of membrane potential. Fusion of HaloTag to NLuc creates a two-acceptor bioluminescence resonance energy transfer (BRET) system when a tetramethylrhodamine (TMR) HaloTag ligand is ligated to HaloTag. In this mode, Q-BOLT is capable of providing direct visualization of changes in membrane potential in live cells via three distinct readouts: change in QRET, BRET, and the ratio between bioluminescence emission and BRET. Q-BOLT can provide up to a 29% change in bioluminescence (ΔBL/BL) and >100% ΔBRET/BRET per 100 mV change in HEK 293T cells, without the need for excitation light. In cardiac monolayers derived from human induced pluripotent stem cells (hiPSC), Q-BOLT readily reports on membrane potential oscillations. Q-BOLT is the first example of a hybrid small molecule – protein voltage indicator that does not require excitation light and may be useful in contexts where excitation light is limiting.
浅议钢琴弹奏教学中学前教育专业学生的职业理想培养
Authors: 周 亚雯
Published: December 2020

当前，中国的学前教育事业发展备受人们的关注，习近平主席在中国共产党第十九大报告中提出，必须把教育事业放在优先位置，办好学前教育，培养高素质的幼师队伍。学前教育的职业理想是学生对未来幼师职业生活的规划、向往和追求，它直接影响其整个职业生涯的成就与归宿。论文旨在以钢琴弹奏理论和实践为指导，在阐述学前教育专业职业理想的定义与内涵的基础上，探寻学生职业理想的成因，并紧密联系钢琴弹奏教学内容和教学过程，运用“专业转换，内容渗透”的方法与手段，帮助学生在掌握和运用钢琴弹奏专业知识与专业技能的同时，切实培养他们“热爱本职、乐于奉献、服务幼儿”的职业道德和职业理想
Durability of highway steel bridges in Czech Republic
Authors: Jirak Jiri , Studnicka Jiri
Published: December 2020

Research at the Department of Steel and Timber Structures of the Faculty of Civil Engineering of the CTU in Prague is focused on steel and steel-concrete highway bridge durability. The paper summarizes the frequent failures of the existing steel highway bridges, discusses failure causes and extended service life effect of bridge maintenance or refurbishment. The thick bridge deck is a typical short span defect. The difference between actual behaviour and numerical model is highlighted. The employed solution is outlined.
Ramberg-Osgood and Manson-Coffin Relation for Shear Studs In Fatigue
Authors: Odenbreit Christoph , Dorka Uwe
Published: December 2020

Welded shear studs in composite bridges are subjected to statical as well as fatigue loading. To proof the fatigue resistance, the so-called Wöhler curves (S-N curves) have been established. The slip displacements in these bridges between concrete slab and steel girder however show that, the loading on the studs is more displacement than force controlled. Results on displacement-controlled fatigue push-out tests on shear studs are presented to describe the correlation between slip and bearable load cycles with the Manson-Coffin equation and the correlation between shear forces and slip with the Ramberg-Osgood equation. Both relations are combined to obtain an assessment of internal forces as well as displacements for the verification of the fatigue resistance.
On assignment in Istanbul: Retrofitting for 0.4g
Authors: Plumier André , van Alboom Wim
Published: December 2020

The paper covers the seismic evaluation and upgrading of an existing 20 - storey hotel building for compliance with a peak ground acceleration of 0.4g in the city of Istanbul. The assignment was performed by SECO. It was finalised only recently and lasted for about 6 years. The implementation of the strengthening design into an operating hotel proved to be an exciting challenge. The standard storey area of the building is about 35.000 m². The building’s structure comprises an (in plan view) S-shaped classical reinforced concrete frame of beams, columns and slabs, divided by 2 joints in 3 independent blocks, but disturbed by the presence of some major irregularities. Quite an experience …
Sındırgı Fayı ve Düvertepe Fay Zonu Yakın Civarının Kinematik ve Sismotektonik Özellikleri: Batı Anadolu (Türkiye)
Authors: Gündoğdu Erdem , Ozden Suha , Bekler Tolga
Published: December 2020

Bu çalışmada; toplam 7 segmentten oluşan Simav Fay Zonu’nun Sındırgı Segmenti ile bu fayın kuzeyinde yer alan Düvertepe Fay Zonu ve civarının kinematik ve sismotektonik özellikleri incelenmiştir. 21 istasyondan, toplam 160 fay düzleminden oluşan kinematik analiz sonuçları birlikte değerlendirildiğinde, belirlenen 4 farklı tektonik rejim yaşlıdan gence doğru sırasıyla; (i) transtansiyonel özellik sunan (SS1a), (σ1)=231°/20°, (σ3)=297°/24°, Rm=0.340 olarak hesaplanan ve sıkışmanın (σ1)=K51°D olduğu, (ii) normal faylarla temsil edilen (SS1b), (σ3)=312°/11° olarak hesaplanan ve genişleme yönünün (σ3)=K48°B olduğu, (iii) transpresyonel özellik sunan (SS2), (σ1)=301°/15°, (σ3)=237°/17°, Rm=0.612 olarak hesaplanan ve sıkışmanın (σ1)=K59°B olduğu (iv) en genç tektonik rejim türü olan, normal faylarla temsil edilen (SS3), (σ3)=233°/8° olarak hesaplanan ve genişleme yönünün (σ3)=K53°D olduğu rejimdir. Bu rejim türleri (deformasyon evreleri) birbirinde ayırt edilirken; kinematik analiz sonucundan elde edilen asal gerilme eksenlerinin yönleri, asal gerilme eksenleri arasındaki oranlar, sahada birbirini üzerleyen fay düzlemi verileri, birbirini kesen fay-atım verileri, sahadaki orta-büyük ölçekli yapılar, benzer ve aynı yaştaki sahalarla yapılan karşılaştırmalar, Batı Anadolu’nun jeodinamik evrimi, bu konuda yapılmış olan benzer çalışmalarla yapılan karşılaştırmalar kullanılmıştır. En genç tektonik rejim türü olan SS3’ün, günümüzde etkin olduğunun bir diğer kanıtı ise, son yıllarda meydana gelen depremlerin odak (faylanma) mekanizması çözümleridir. Çalışma alanında meydana gelen 12 depremin odak mekanizması çözümlerine göre, (σ3)=211°/2°, bölgedeki genişleme yönünün (σ3)=K31°D olduğu şeklindedir. Bu veri, günümüzde KKD-GGB yönünde bir genişleme rejiminin baskın olduğunu göstermektedir. Bu durum, günümüzde Batı Anadolu’da etkin olan genişleme rejiminin yönleriyle de uyum içindedir.