bluuebunny/crossref_metadata_2025 huggingface dataset:
The Influence of Dentin Wall Thickness and Adhesive Surface in Post and Core Crown and Endocrown Restorations on Central and Lateral Incisors
Authors: Hofsteenge JW , Gresnigt MMM
Published: April 2021

Clinical Relevance

Post and core crowns and endocrowns perform similarly on fracture strength, but endocrowns have more repairable fractures.

Purpose:

The main purpose of this study was to determine the influence of dentin wall thickness (DWT) and adhesive surface on the fracture strength and failure mode in maxillary incisors restored with post and core crowns or endocrowns.

Methods and Materials:

Forty-eight sound maxillary incisors were selected and randomly divided into four groups (n=12): lateral incisor endocrown, lateral incisor post and core, central incisor endocrown, and central incisor post and core. All specimens obtained an endodontic treatment and were decoronated (2 mm ferrule remained). Chamfer outlines ended at the cementoenamel junction (outline in dentin). Dentin wall thickness (mm) was measured on 12 points per sample using a modified digital calliper. Fiber posts and cores were placed in two groups, and an immediate dentin sealing was applied on exposed dentin in all groups before taking digital impressions. Digital impressions were analyzed and the adhesive surface (mm2) was measured. Indirect restorations were made of lithium disilicate (IPS e.max, computer-aided design/computer-aided manufacturing). The restorations were luted after surface conditioning the crowns and teeth. Thermocyclic aging was performed (10,000 times in baths of 5°C and 55°C) and the specimens were loaded until fracture. Fractures were specified on failure mode and repairability, and they were analyzed with one-way ANOVA, χ2-test, and linear regression analysis in SPSS (α=0.05).

Results:

There was no significant difference in fracture strength and failure mode between all groups. Endocrown restorations on central incisors had significantly more repairable fractures than the post and core crowns. Regression analyses showed a statistically significant positive correlation between DWT/adhesive surface and fracture strength in the post and core groups.

Conclusions:

Both endocrowns and post and core crowns on the central and lateral incisors obtained clinically applicable fracture strengths. In the central incisor groups, the endocrown restorations had significantly more repairable failures. When the walls were thicker, or when the adhesive surface was larger, higher fracture strengths were obtained in the post and core groups.
Pengembangan Bahan Ajar Realistic Mathematic Education (RME) Bermuatan Higher Order Thinking Skill (HOTS)
Authors: Qoiriah Miftahul , Vahlia Ira , Agustina Rina
Published: April 2021

This study aims to determine the validity and practicality of RME teaching materials containing Higher Order Thinking Skills (HOTS) on straight line equations in class VIII SMP Negeri 1 Kotagajah. This type of research is development research that uses the 4-D development model, while the stages are Define, Design (Planning), Develop (Development), and Disseminate (Spread) but this stage is not used. The data collection instrument used was a questionnaire. The practicality test was carried out online. Validation of material experts was carried out by two validators, and the results obtained were 81.31% with very valid criteria. design expert validation was carried out by two validators, and the results obtained were 76.02% or were in the valid criteria. The small group trial was conducted by 7 students, and the results of the small group trial were 79.3% or were in practical criteria. Based on the validation process and the small group trial process, RME teaching materials containing Higher Order Thinking Skills (HOTS) on straight line equations material for class VIII SMP Negeri 1 Kotagajah are declared valid and practical.
Peningkatan Hasil Belajar Siswa dalam Pembelajaran Inquiry Terbimbing dengan Media Papan Operasi Matriks
Authors: Darmayanti Inung , Sa'o Sofia , Mei Maria Fatima
Published: April 2021

The purpose of this research is to increase the historical value of material through a guided inquiry model with the medium of mɑtrix operation of the matrix material. This research uses classroom action research. The subjects in this study were 20 students of class XI MIPA Islamic Private High School Muthmainnah Ende. The data analysis technique used is the analysis of teacher activity data and student activity well as analysis of learning test results. The results showed that guided inquiry learning matrix operation board media could improve student learning outcomes matrix material with the percentage of student activity from 64% in cycle I increasing 18% to 82% in cycle II. Teacher activity in cycle I 77.75% increased 9.75% to 87.50% in cycle II. The average value in the initial test was 44.25, increased by 29.5 in the first cycle with an average of 73.75, and the second cycle increased by 11 values in the second cycle with an average of 84.75. The completeness of the scores on the initial test was 20% of students who completed a cycle, I increased by 45% students who completed and in cycle II increased by 45% to 90% of students who completed.
TRENDS IN THE VARIABILITY OF THE CHEMICAL COMPOSITION AND WATER POLLUTION LEVEL IN THE KUBAN RIVER
Authors:   Hydrochemical Institute, Reshetnyak O. S. ,   Institute of Earth Sciences, Southern Federal University, Rostov-on-Don, Russian Federation, Komarov R. S. ,   Hydrochemical Institute; Institute of Earth Sciences, Southern Federal University, Rostov-on-Don, Russian Federation
Published: April 2021

Introduction. The paper explores the long-term spatial and temporal variability of the chemical composition and water quality in the Kuban River. Methods. To study the variability of the chemical composition of river water, we analyzed data from systematic observations over the concentrations of major ions, biogenic and organic substances, petroleum products and heavy metals from 2010 to 2017. To describe the variability of water quality, we used such indicators as water quality class, water pollution level, and characteristic pollutants. Results. It is shown that the spatial change in the chemical composition is uneven — a number of components in the water have low concentrations in the upper reaches, increasing in the lower part of the river. Others are characterized by high concentrations in the middle reaches, followed by a decrease towards the mouth. Over time, the change in the concentrations of chlorides, sulfates, organic substances and petroleum products increases. As for the content of nitrates, a slight decrease was detected in its variability. For the remaining chemicals, there were no clear trends. We established that in most cases the water in the Kuban River can be classified as polluted and very polluted (water quality class 3). We also found that the nature of river water pollution regarding a number of components is stable. Conclusion. In modern conditions of sharp climate changes and anthropogenic impact, the identified features of the chemical composition and trends in water quality variability of the Kuban River are of great practical importance and can be used in the development of environmentally sound recommendations for improving water quality and the state of water ecosystems in the river basin.
DETERMINATION OF COMPONENTS, DISSOLVED ORGANIC AND INORGANIC SUBSTANCES IN NATURAL WATERS
Authors:   Saint Petersburg State University of Architecture and Civil Engineering, Saint Petersburg, Russian Federation, Shabalin V. V. , Rogozhina T. S. ,   Saint Petersburg State University of Architecture and Civil Engineering, Saint Petersburg, Russian Federation
Published: April 2021

Introduction. Large urban agglomerations have to deal with issues related to the high-quality drinking water supply. These issues are mainly due to water quality deterioration, poor condition and severe wear of water supply infrastructure facilities. Materials and methods. In our study, we analyze the composition of drinking water in the water supply system of St. Petersburg for SiO2 and Al2O3 nanoparticles and organic substances, including soluble proteins, protein components, and salts. For this purpose, we estimated the concentration and distribution of nanoparticles and organic impurities in the sediment formed after water evaporation from a sample in the form of a droplet. During the process, the following methods were used: the method for dehydration of water droplets with the formation of a solid phase, the methods for optical analysis of the sediment structure based on image analysis and recognition (photo and video recording of microscopic images), mathematical modeling of sediment structures’ formation, and statistical analysis of the results. Results. The presence of impurities in water was determined by the formation of periodic annular ring structures in sediments of aqueous solutions. The analysis of the structures obtained made it possible to determine the composition of the mixture and percentage content of individual fractions by the type of structural elements and their periodicity. We also developed a mathematical model simulating the processes of particle settling out of a solution. The calculations were carried out using model liquids and made it possible to obtain dependencies for the distribution of various dissolved particles in the structure of the solid phase, as well as to describe the staged mechanism in settling during its formation.
SELECTING ENGINEERING SOLUTIONS FOR WATER TREATMENT MODULES IN THE OIL AND GAS FIELD AREAS OF THE FAR NORTH
Authors:   VINKO Research and Production Company OOO, Saint Petersburg, Russian Federation, Sanin G. M. , Rukobratsky N. I. ,   Saint Petersburg State University of Architecture and Civil Engineering, Saint Petersburg, Russian Federation, Baruzdin R. E. ,   Saint Petersburg State University of Architecture and Civil Engineering, Saint Petersburg, Russian Federation
Published: April 2021

Introduction. The article provides data on engineering solutions for water treatment modules being part of the utility and drinking water supply complexes in small settlements located in the Far North, where low-turbidity, high-colored waters serve as the surface sources of water supply. These sources include the river networks of the Ob River (including the southern area of the Gulf of Ob, Kara Sea), Pur River, and Taz River (including the Gulf of Taz, Kara Sea). Methods. We present an analysis of the applied water treatment technologies, reagents, and materials, as well as water processing modes, and establish the reasons for the unsatisfactory performance of the operated water treatment modules implementing physical-and-chemical methods of water purification. Results. It is found that the use of granular materials as media for rapid filters (AS, MS, MZhF autocatalytic sorbents) is not very effective since they are intended for the purification of colorless groundwater with a high content of dissociated compounds of divalent iron and manganese. Throughout the year, the modules operate without account for seasonal fluctuations in the qualitative composition of the source water and with reagents that have lost their active properties. Conclusion. Based on the conducted studies, we propose engineering solutions for the purification of low-turbidity, high-colored waters of surface sources, making it possible to achieve target quality indicators complying with the best available technologies.
First Superconducting Fault Current Limiter in Russian Power Grid
Authors:   CJSC ", MOZAH Michael E. ,   SuperOx",   , Moscow, SAMOYLENKOV Sergey V. ,   CJSC "SuperOx", Moscow, VAVILOV Andrey P. ,   CJSC "SuperOx", Moscow, PROKHOROV Evgeny P. ,   JSC "United Energy Company" (JSC "UNECO"), PUCHKOV Andrey S. ,   JSC "United Energy Company" (JSC "UNECO"),, MAYOROV Andrey V. ,   PJSC ROSSETI, BAYBEKOV Rustam L. ,   JSC "System Operator of the Unified Energy System", TOKAREVA Oksana V. ,   JSC "System Operator of the Unified Energy System", ZHUKOV Andrey V. ,   JSC "System Operator of the Unified Energy System"
Published: April 2021

Superconducting fault current limiter (SFCL) is an innovative method for reducing the level of short-circuit currents in high-voltage electrical networks. This reduces the number of points of separation of the electrical network in conditions of short-circuit current limitation and thereby increases the network capacity and reliability of power supply to consumers. At the same time, the development of such devices poses new challenges for power engineers related to the integration of this equipment into the existing power system. The article discusses the process of implementation and pilot operation of the SFCT 220 kV pilot project (produced by CJSC “SuperOx”) at the 220/20 kV “Mnevniki” high-voltage substation in Moscow. The project required an extensive set of scientific studies and tests to confirm the characteristics of new devices and the possibility of their use in Russian power systems, the use of digital modeling technologies to test the operability of relay protection devices, as well as the development of new methodological documents for calculating the short-circuit current and relay protection parameters. As a result of the work, SFCT was switched on at the 220/20 kV “Mnevniki” substation at the end of 2019. The subsequent operation of the SFCT in 2019-2020 fully confirmed the declared characteristics of the device and the correctness of the selected technical solutions. The article is devoted to the features of the process of integrating a new device into the existing power system, the main technical solutions, the results of testing and operation of the device, as well as possible prospects for the development of SFCT technology.
The Use of Concentrated Windings for High-Power Synchronous Wind Generators
Authors:   Russian Academy of Sciences (RAS), Institute of Silicate Chemistry named I.V.  Grebenshchikov (ISCh), St. Petersburg, ANTIPOV Viktor N. , GROZOV Andrey D. ,   Russian Academy of Sciences (RAS), Institute of Silicate Chemistry named I.V.  Grebenshchikov (ISCh), St. Petersburg, IVANOVA Anna V. ,   Russian Academy of Sciences (RAS), Institute of Silicate Chemistry named I.V.  Grebenshchikov (ISCh), St. Petersburg
Published: April 2021

Low-power machines were commonly considered as the main application field of concentrated windings. However, a lot of paper have recently been published, which address both the theory of these windings and specific cases of their application for large synchronous machines. The article presents an analysis of the parameters of concentrated windings having various configurations intended for use in high-power gear and gearless wind generators. In assessing the winding, not only the high winding factor value was taken into account, but also the star of slot EMFs, harmonic spectra of the MMFs and EMFs, the cogging torque component and torque pulsation under load, as well as emerging losses. It is shown that the well-known advantages of concentrated windings over distributed windings can be fully realized by choosing the appropriated numbers of slots and poles.
Circuit-algebraic calculation of steady-state modes of electric networks
Authors:   Ul’yanovsk State Technical University (USTU), Ul’yanovsk, KURGANOV Sergey A. , FILARETOV Vladimir V. ,   Ul’yanovsk State Technical University (USTU), Ul’yanovsk
Published: April 2021

In iterative algorithms for calculating the steady-state modes of AC electrical networks, it is proposed to use compact symbolic-numerical functions of nodal voltages formed by the method of circuit determinants once. These functions, due to algebraic convolution, have many times less complexity than the expanded expressions obtained by the tree method. Such functions are found by circuit-algebraic formulas in the form of a ratio of circuit determinants by allocating parameters. First of all, the conductivities (resistances) composed of a larger number of parallel (sequential) branches and incident nodes with a minimum (maximum) degree are distinguished. The original and derived schemes are recursively divided into parts that are similar in complexity. It is shown that the known computer systems for analytical calculations do not take into account the features of electrical circuits, without providing compact convolution.
The Algorithmic Aspects of Creating and Using Wireless Sensor Network Key Spaces Based on Combinatorial Block Diagrams
Authors:   NRU MPEI, Frolov Aleksandr B. , Kochetova Natalya P. ,   NRU MPEI, Klyagin Anton O. ,   NRU MPEI, Temnikov Dmitriy Yu. ,   NRU MPEI
Published: April 2021

Algorithmic approach principles relating to development and use of wireless sensor network (WSS) key spaces are formulated based on an analysis of the keys management peculiarities. The formulated principles, which meet certain requirements for the WSS key spaces, have been elaborated proceeding from the assumption that their structure corresponds to one of the varieties of combinatorial block diagrams: cyclic or acyclic projective plane, linear or quadratic transversal block diagrams. Owing to the WSS having a distributed configuration, it becomes possible to avoid the need to construct a combinatorial block diagram in full scope, and the required blocks are computed, whenever necessary, in scaling the network (in adding new nodes) or when determining, in a decentralized manner, the switching parameters of specific nodes. To do so, it is necessary to have algorithms for computing the blocks of the combinatorial block diagram (as the sets of key numbers allocated to a given node) and dual blocks (as the sets of the numbers of nodes to which keys are assigned with the numbers coinciding with the numbers of dual blocks), as well as algorithms for solving derived problems: computing of the key numbers common to two nodes and the number of the node that has a common key with one of two nodes and, possibly, another key with the other one. These problems are solved by using the numbering of elements, blocks and dual blocks in accordance with the proposed duality rule: sets of elements and dual blocks are in one-to-one correspondence by numbering; the dual block with a specified number contains the numbers of blocks containing elements with this number. Distributed (independent) calculation of blocks is carried out on the basis of algebraic identifiers computed by block numbers. In addition to the possible absence of a physical connection between the nodes, the inadmissibility of using separate (compromised) keys is taken into account, and the incomplete furnishing of the network nodes with keys, as well as the incompleteness of the system implementation as a whole. Algorithms for computing the switching parameters of two nodes in designing the WSS and an algorithm for computer modeling of the calculation of such parameters during the WSS operation subject to the specified constraints and in using any of the above types of combinatorial block diagrams are presented.
Analysis of Foreign Experience in Using Flue Gas Purification Systems at Waste-to-Energy Plants
Authors:   NRU MPEI, Efremov Anton N. , Dudolin Aleksey A. ,   NRU MPEI
Published: April 2021

The existing method for selecting the structure of a power plant for thermally recycling municipal solid waste (MSW) in the Russian Federation does not address the matter of selecting all components of an energy complex operating on MSW, but places focus on determining the best accessible waste thermal neutralization technology. This generates the need to search for new methods and to select criteria of choosing the structure for each particular project. A comparative analysis of various structural schemes of waste-to-energy plants widely used outside of Russia will make it possible to reveal their main advantages and drawbacks, and to determine their application fields. The article describes the statistical indicators characterizing the operation of the flue gas purification system from acid gases, which can be applied in performing a feasibility study, intellectual property assessment, and in carrying out front-end engineering. For waste-to-energy plants constructed in an urban environment and aimed to operate with keeping to a minimum the gross emissions of acid gases into the atmospheric air, the use of a wet reactor system is recommended, which will ensure low emissions of HF, HCl, and SOx. The system with a wet reactor will make it possible to reduce gross emissions of harmful substances during the operation of large capacity waste-to-energy power plants and will be a justified choice in such case. In constructing medium capacity waste-to-energy plants (with a throughput of up to 350 000 t of MSW per annum), semi-dry and dry reactors can be used; for such plants, the technology involving the use of a semi-dry reactor is the most preferred one.
Digital Correction of Readings Produced by Fluid Level Measurement Channels at NPPs Equipped with Sensors Having a Dead Zone
Authors:   NRU MPEI, Voronkov Ivan A. , Kalashnikov Aleksandr A. ,   NRU MPEI
Published: April 2021

The introduction and development of computerized digital systems in modern power engineering has led in Russia to a full modernization of domestically produced nuclear power plant measurement systems. In particular, digital methods for correcting the readings of hydrostatic level sensors have been widely put in use since 2013. The experience gained from putting them in use was generalized in the reference and organizational and methodological literature in 2017. However, the subsequent results of preoperational adjustments carried out at newly designed nuclear power units and at those under construction have shown that some issues still remain unresolved in this application field. In particular, there is a need is to develop digital methods for correcting the readings produced by channels measuring the level of liquid media in pressurized process tanks if there occurs a sensor dead zone. The complexity of this problem is stemming from the fact that it is not possible to take the sensor dead zone into account by introducing a constant correction to the measurement channel readings in view of the technological process peculiarities. Thus, during the operation of nuclear power units, the water density in pressurized process tanks and vessels decreases from 980 to 590 kg/m3, and the vapor density increases from 0 to 100 kg/m3. Such changes give rise to complex thermal and physical interphase processes that occur under the conditions of large mass transfers of the vapor--water mixture. As a result, the sensor's dead zone boundary undergoes an essential change in the tank longitudinal section depending on the current values of the working fluid thermal and physical characteristics. To solve this problem, digital methods for online correction of measured level readings are proposed that take into account changes in the two-phase working medium (vapor--water) in the course of a continuous technological process. Nowadays, the introduction of digital methods for correcting the hydrostatic level sensor readings is especially relevant in connection with the development of industry programs aimed at increasing the capacity of newly designed and operating nuclear power units, which pose more demanding requirements to the accuracy of thermal and physical measurements and operational safety as a whole.
Ways to Improve the Reliability of Bearings in Traction Induction Machines
Authors:   NRU MPEI, Tulupov Viktor D. , Sleptsov Mikhail A. ,   NRU MPEI, Briedis Aleksandrs A. ,   NRU MPEI
Published: April 2021

The problem of electric rolling stock traction machinery failures caused by electrical erosion of bearings is addressed. Damages inflicted to traction machinery bearings as a result of electric current flowing through them have been known since long ago. In recent time, however, damages of this kind have become more frequent, because frequency and voltage converters for control of three-phase inductor motors are widely used in the electric rolling stock. An overview of factors causing the occurrence of stray currents generated in frequency converter driven traction motors and sources of these currents is presented. Electric current flows through rolling bearings in the area of the contact between the rolling elements with inner and outer rings, thus causing damage to the bearing metal components' rolling surfaces and degrading the quality of lubricants. To study and analyze the currents through bearings, the stray capacitances existing in traction machines are determined, and their calculation methods are defined, the necessity of which is stemming from the fact that these capacitances influence the generation of parasitic currents. The stray capacitances in traction machines include the capacitance between the stator windings and the stator core pack, the capacitance between the stator windings and the rotor, the capacitance between the rotor and the stator core pack, and the capacitances of the bearings. From the electrical point of view, bearings may also be regarded as capacitances. As long as there is a continuous lubricant film between the inner ring and outer rings and the rolling elements, the bearings behave as capacitors. A difference of potentials across the bearing elements may lead to electrostatic discharges and, hence, to discharge currents through the bearings. One of possible ways to enhance the reliability of traction machine bearing units is to use insulated bearings. The change in the impedance of bearings with ceramic coating and hybrid rolling elements depending on the applied voltage frequency and operating temperature is calculated and analyzed. Conclusions regarding the expediency of using hybrid bearings having rings made of bearing steel and rolling elements made of bearing silicon nitride (Si3N4) are drawn.
An Adaptive Power Controller of the Induction Crucible Furnace with a Conducting Ferromagnetic Crucible
Authors:   NRU MPEI, Fedin Maksim A. , Kuvaldin Aleksandr B. ,   NRU MPEI, Kuleshov Aleksey O. ,   NRU MPEI, Akhmetyanov Svyatoslav V. ,   NRU MPEI, Kondrashov Sergey S. ,   NRU «MPEI»
Published: April 2021

A structural model of a high-frequency induction crucible furnace with a conducting ferromagnetic crucible is developed in the Simulink/Matlab environment based on investigations carried out by the authors. The inductor current was calculated using the inductor's resistance and inductance dependences on temperature, frequency, and current. An induction crucible furnace power control system structural model is designed based on the developed model. The output voltage pulse-frequency modulation is used as a furnace power control method. An adaptive power controller for the induction crucible furnace with a conducting ferromagnetic crucible is developed, which includes two channels for control of the power supply source frequency and voltage. It has been determined that the melting with the lowest energy expenditures is obtained in the case of using a power controller with two different adaptive control structures. The controller operates based on the frequency control principle and uses structures depending on the current temperature value. The use of the adaptive power controller with two control channels can significantly reduce the specific electric energy consumption in comparison with automatic frequency adjustment, in particular, by a factor of 1.45 for the IGT-1.6M industrial furnace.
Formulating and Solving an Optimization Problem with Heterogeneous Optimality Criteria in Evaluating the Dynamic System Performance
Authors:   NRU MPEI, Elraheem Amin Kamal Abd , Shikhin Vladimir A. ,   NRU MPEI
Published: April 2021

An approach to formulating and solving the problem of comprehensively evaluating the dynamic system performance is proposed. A MicroGrid represented in a multi-agent system (MAS) form is taken as an example. A unified definition of agents applied to the class of dynamic systems formalized in the form of continuous, discrete and discrete-event models is introduced. The performance efficiency of both the MicroGrid and its individual components (agents) is assessed. The developed flowchart for MicroGrid performance assessment serves as a basis for optimizing the MicroGrid performance indicators in the online mode. By using the proposed solution, it becomes possible to formalize the integration of heterogeneous objective functions into unified criteria by certain types and also taking into account the performance assessments of individual components in the interconnected system. Technical, economic and environmental criteria are considered as standard performance criteria. To obtain a generalized solution with taking into account the heterogeneity of the considered efficiency criteria, a fuzzy model based on the fuzzy sets theory is proposed as a tool for convolution of these criteria. The flowchart of the algorithm for MicroGrid performance assessment is developed taking as an example the design of a hybrid-generating and environmentally safe power supply system for the Arctic enclave with a specified configuration.
RENT SEEKING DAN PRAKTIK KORUPSI DI TUBUH BUMD: KASUS BUMD PT BANTEN GLOBAL DEVELOPMENT (BGD)
Authors: Mahpudin Mahpudin
Published: April 2021

Artikel ini membahas tentang praktik rent seeking di tubuh Badan Usaha Milik Daerah (BUMD) spesifik pada PT Banten Global Development (BGD) sebagai perusahaan milik Pemerintah Provinsi Banten. Alih-alih memberi kontribusi terhadap Pendapatan Asli Daerah (PAD) dan pembangunan di Banten, PT BGD justru hanya menjadi alat perburuan rente antara state actor dan economic actor dengan memanfaatkan sumber daya keuangan yang dimiliki pemerintah untuk kepentingan ekonomi politik segelintir elit. Artikel ini berusaha memetakan pola rent seeking yang bekerja dibalik pengelolaan perusahaan PT BGD. Metode kualitatif dipilih dalam penelitian ini, adapun pengumpulan data dilakukan melalui studi literatur terhadap berbagai bahan bacaan yang relevan. Hasil penelitian menunjukkan bahwa pembentukan PT BGD menciptakan korupsi pada perusahaan pemerintah melalui praktik rent seeking. Pola rent seeking yang terbentuk adalah “rent seizing” yaitu state actors berusaha mendapatkan hak mengalokasikan rente yang dihasilkan dari institusi pemerintah untuk kepentingan individu dan kelompoknya. Di sisi lain, pihak perusahaan (economic actor) memperoleh keuntungan  dari kebijakan yang dibuat oleh elit politik dengan cara menyuap dan cara-cara lain yang melanggar konstitusi. Pihak perusahaan yang dimaksud tidak merujuk pada perusahaan swasta melainkan perusahaan milik pemerintah yaitu BUMD PT BGD.
Jacques, M.-H. (2020). Les transitions identitaires dans les parcours d’éducation. Presses Universitaires de Rennes. 288 p.
Authors: Tschopp Geneviève
Published: April 2021

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Wagnon, S. (dir.) (2019). Le manuel scolaire, objet d’étude et de recherche : enjeux et perspectives. Peter Lang. 310 p.
Authors: Capitanescu Benetti Andreea
Published: April 2021

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Des recherches sur la formation des enseignant·e·s de plus en plus focalisées et de moins en moins argumentées ? Explorations typologiques d’un chassé-croisé
Authors: Perrenoud Manuel , Muller Alain
Published: April 2021

Cette contribution propose un exercice de double classification d’un corpus restreint de textes (issus de la RSSE entre 2000 et 2019) qui concernent la relation entre recherche en éducation et formation à l’enseignement. Un paradoxe est mis en exergue : au fil des années, une augmentation des prétentions épistémologiques à décrire un lien normatif entre recherche et formation est relevée alors que, dans le même temps, la teneur argumentative diminue. Cherchant à conceptualiser et interpréter cette évolution, les auteurs de cette synthèse rétrospective suggèrent que les préoccupations dominantes des sciences de l’éducation auraient elles-mêmes changé d’échelle.
Due decadi di tecnologie digitali in educazione.
Authors: Losa Stefano , Botturi Luca , Hermida Martin , Boéchat-Heer Stéphanie
Published: April 2021

Alla luce della forte pervasività sociale e culturale, nelle società contemporanee, di tutte quelle tecnologie chiamate dell’informazione e della comunicazione, contraddistinte appunto dalla dimensione digitale, l’articolo si propone di fare una sintesi informata sul tema delle tecnologie digitali in educazione e formazione. Tale sintesi scaturisce da un campione di 25 articoli rilevanti ed evidenzia tre grandi aree tematiche che hanno contraddistinto il tema delle tecnologie digitali in ambito educativo e formativo: l’uso di risorse digitali all’interno delle pratiche di insegnamento e apprendimento, l’uso adeguato delle tecnologie digitali, anche al di fuori dei contesti formativi ed educativi, e la formazione del corpo docenti alle tecnologie digitali e soprattutto al loro utilizzo a fini didattici e pedagogici. Tale sintesi rappresenta un’opportunità privilegiata per evidenziare ciò che la rivista ha contribuito a diffondere in tale ambito dal punto di vista scientifico. L’articolo, grazie anche ad uno sguardo attuale sugli sviluppi della ricerca sulle tecnologie in educazione, permette così di delineare gli orientamenti passati e recenti, così come le problematiche e le criticità attuali che contraddistinguono questo ambito importante e in continua evoluzione.
Open Access Zeitschriften in den Bildungs- und Erziehungswissenschaften.
Authors: Rummler Klaus
Published: April 2021

Anhand illustrativer Beispiele betrachtet der vorliegende Beitrag ausgewählte Aspekte des Betriebs von Open Access Zeitschriften in den Bildungs- und Erziehungswissenschaften. Ausgehend vom Versuch, das Publikationsaufkommen der (schweizerischen) Bildungs- und Erziehungswissenschaften zu erschliessen, richtet sich der Blick auf die veränderte Rolle von Bibliothekskatalogen und auf den offenen Zugang zu wissenschaftlichen Inhalten, insbesondere auf Open Access Zeitschriften. Auf die Frage, durch welche Merkmale sich eine Zeitschrift als solche auszeichnet stellt sich zunehmend heraus, dass offene Metadaten eines der zentralen Mittel für die Verbreitung und Auffindbarkeit sind. Ein Blick auf vergleichbare Zeitschriften innerhalb Europas offenbart dann auch Herausforderungen für Qualitätssicherung. Die abschliessende Diskussion stellt nochmals Machtverschiebungen heraus, die Open Access Zeitschriften implizieren, stellt den weltweit hohen Publikationsoutput in Frage und fordert letztlich Nachhaltigkeit und Verlässlichkeit sowohl in Bezug auf Datenstrukturen als auch in Bezug auf die Unterstützung der Hochschulen.
Detection of Biological Activity of Curcuma longa Methanol Extract and Its Antibacterial effect on Staphylococcus aureus
Authors: Ogbonna Covenant , Özgör Erkay
Published: April 2021

Plants are known to possess enormous profound benefits, which if well incorporated in daily living have the potential to influence our health in ways unexpected. Significant progress has been made concerning the anti-oxidative and anti-cancerous effect of bioactive components in food products, worthy of note in the curcuminoids derived from turmeric (Curcuma longa) rhizomes. Therefore, to this end, this research aims to describe succinctly the phytocomponents, antioxidant activity and anti-microbial activity of turmeric methanol extract. The zones of inhibition were measured after plating on a Mueller Hinton agar plate and compared to the standards penicillin G and chloramphenicol. Chloramphenicol used as a positive control was found to be most effective on Staphylococcus aureus while Curcuma longa methanol extract and penicillin G were found to have the same microbial inhibition due to the negative control. Compared to the IC50 values of Ascorbic acid which was 5 mg/ ml, Curcuma longa methanol extract had a lower IC50 value is 3.2 mg/ml which according to previous literature is a good one given that lower IC50 values indicate great antioxidant activity. It was gathered by the observation that the qualitative extraction of Curcuma longa using methanol shows the presence of varying chemical components such as AR-tumerone, arachinsaeure, alpha-tumerone amongst others. Research data suggest that ar-turmerone has the potential to promote the positive and negative proliferation of tumor cell lines. As a result, Curcuma longa has high potential to be developed into an antibiotic against Methicillin-resistant Staphylococcus aureus and other clinically important bacterial strains in future.
Comparison of three diagnostic methods in the diagnosis of cryptosporidiosis and gp60 subtyping of Cryptosporidium parvum in diarrheic calves in Central Anatolia Region of Turkey
Authors: Yildirim Alparslan , Sevinc Ferda , Onder Zuhal , Duzlu Onder , Ekici Ozlem Derinbay , Isik Nermin , Ciloglu Arif , Simsek Emrah , Yetismis Gamze , Inci Abdullah
Published: April 2021

The aim of this study was to compare three diagnostic methods for the diagnosis of cryptosporidiosis and to detect subtypes ofCryptosporidium parvum by sequences analyses of gp60 gene in diarrheic calves in several herds in Konya province located in Central Anatolia Region of Turkey. Fecal samples were collected from a total of 194 pre-weaned calves (n=158, ≤15 days old, and n=36, 15 to 40 days old), with diarrhoea. For comparative diagnosis, all samples were examined by modified Ziehl-Neelsen staining of fecal smears for the presence of oocyst, nested PCR-RFLP of SSU rRNA and TaqMan qPCR for the detection of Cryptosporidium DNA. A total of 92 (47.4%) and 104 (53.6%) out of the examined samples were found positive by microscopic examination and molecular tools, respectively. The diagnostic sensitivity and specificity of microscopic identification were determined as 88.5% and 100.0%, respectively compared to molecular assays. Cryptosporidium parvum was the only detected species in all positive samples by species-specific qPCR and nested PCR-RFLP assays. Species identifications were further confirmed by sequence analyses of the SSU rRNA PCR products. There was no statistically significant difference in C. parvum prevalence between early pre-weaned calves and calves older than 15 days. The sequence analyses of the gp60 gene of C. parvum isolates revealed a one subtype IIaA13G2R1 belonging to zoonotic family IIa in diarrheic calves
Yoga as an Adjuvant for Cancer Patients in India
Authors: Chakrabarty Jyothi , Vidyasagar M S
Published: April 2021

Though Yoga has originated in India, its scientific use to alleviate the sufferings of cancer patients in India is thin. There are very few published studies on yoga intervention for cancer patients from India. The objective of this review was to analyze the studies that have used yoga as an adjuvant for cancer treatment. Literature searches were made in PubMed, CINAHL, Google Scholar, Proquest and Science Direct for retrieving the related studies. Data were analyzed according to the objective. The compiled results show that yoga and pranayama interventions for cancer patients in India focused mostly on psychological aspects like anxiety and depression. Few studies have explored deep into the mechanisms by which the interventions produce the desired effects. Only very few researchers have analyzed the genetic or biochemical changes that occur in the human body as a result of practicing yoga. Currently, the focus is generally on breast cancer. Researches with yoga and pranayama as an adjuvant for other cancers also need to be experimented.
Acinar cell carcinoma in childhood: A case report of a very rare tumor
Authors: Pourtsidis Apostolos , Papachristidou Smaragda , Achilleos Orthodoxos , Mirza Darius , Servitzoglou Marina , Doganis Dimitrios , Kapetaniou Konstantina , Nikita Maria , Magkou Evgenia , Ptochis Nikolaos , Papazoglou Anastasia , Moutafi Antonia , Pantalos Georgios , Michail Aikaterini , Baka Margarita
Published: April 2021

Introduction

Pancreatic tumors are reported rarely in childhood and represent an extremely rare entity in Pediatric Oncology. One of the least common types of pediatric pancreatic tumor is acinar cell carcinoma (ACC). We aim to present a rare case of ACC and the difficulties we faced during diagnosis and treatment.

Patient and Methods

An 8-year old girl presented with jaundice. Workup revealed a tumor originating from the head of the pancreas with multiple metastatic lesions in her liver. Evaluation of tumor markers revealed elevated levels of AFP. Pathology report was indicative of acinar cell carcinoma of the pancreas.

Results

After consulting the EXPeRT group (European Cooperative Study Group for Pediatric Rare Tumors), chemotherapy was initiated. Partial response was observed after the first 4 courses with decrease of AFP levels. While planning her surgery, AFP elevated and a second-line course of chemotherapy was administered. Our patient underwent Whipple’s Duodenopancreatectomy with partial metastasectomy. Although the postoperative period was uneventful, AFP continued to rise even after postoperative chemotherapy was administered. There were signs of metastatic disease progression. Our patient received a third-line regimen with no improvement. She received local radiotherapy and a next-line chemotherapy course. Local relapse and metastatic disease progression placed our patient in palliative care. She passed away nine months after the initial diagnosis.

Conclusions

Acinar cell carcinoma of the pancreas is a rare type of pediatric cancer with very challenging diagnosis and treatment. Cooperation at the European level and multicenter management of those rare cases is vital for the optimum outcome.
Targeted therapy in advanced desmoid tumors: Current perspectives
Authors: Mohammed Amrallah A. , EL-Tanni Hani , EL-Khatib Hani M.
Published: April 2021

Background

Desmoid tumors/aggressive fibromatosis (DTs/AF) are cytological bland fibrous neoplasms originating from the musculoaponeurotic structures throughout the body. The exact cause still remains unknown, however, they may present sporadically or as a manifestation of a hereditary syndrome called familial adenomatous polyposis (FAP). Although they lack the capacity to establish metastases, DTs/AF may be devastated and occasionally fatal. As a result of the heterogeneity of DTs/AF, treatment needs to be individualized to improve local tumor control and maintain patients’ quality of life. Therefore, after a multidisciplinary approach, all treatment options should be discussed with patients. Where systemic chemotherapy has been shown to be unsuccessful with marked side effects in case of advanced DTs/AF, new therapeutic options are needed.

Methods

A Medline search was conducted and published articles in different studies from 2000 to the present were reviewed.

Conclusion

More research is needed to illustrate both the prognostic and predictive factors of the targeted therapy and the value of their combinations with or without other treatment modalities to get the best result for the treatment of advanced DTs/AF.
MAY THE LOVE BE WITH YOU: FROM THE JOY OF LIFE TO THE TRANSCENDENCE OF EXISTENCE IN TAKAHATA ISAO’S ANIMATION WORKS
Authors:   Hiroshima University, Maria Grajdian
Published: April 2021

From Ponpoko: The Heisei Tanuki War (1994), through My Neighbours, the Yamadas (1999), and until The Tale of Princess Kaguya (2013), the animation movies directed by the reputed animation director Takahata Isao (1935-2018) and released by Studio Ghibli since mid-1990s address the phenomenon of “life” as a meaningful endeavour towards attaining higher levels of human awareness. This occurs either by living in accordance with the flow of history, or by enjoying every moment as it comes, or, respectively, by delving into cosmic rhythms of imponderability: every single entity of existence delivers significance and comprehension, as displayed on multiple layers in the three animation works analyzed in this paper. Thus, in a phenomenological approach inspired by Julia Kristeva’s monumental publication La Révolution du langage poétique (1974) which views cultural products as mirroring channels of repression (Verdrängung) and desire (Begehren), the analysis draws on an anthropological framework in which the researcher functions as a dynamic, self-reflexive interface mediating between the self-ness of the theoretical structure (here: life and the quest for its significance) and the other-ness of the representation medium (here: Japanese animated works).
Impact of Major Highways on the Wildlife Population in Kingston and Frontenac County
Authors: Robinson Paige , Mclaughlin Gavin , O'Meara Michael , Ouellette Hilary
Published: April 2021

Over the past five years, there has been an abundance of interest concerning the ecological effects of major Ontario highways on the habitats and ecosystems of many wildlife populations. The primary concern with multilane, high-traffic freeways is that they typically divide existing habitats into relatively isolated zones. Consequently, this separates individuals within a population from other members of the same population, and also excludes access to many natural resources. The majority of the resultant issues for wildlife fall under three main categories; the collision based mortalities of organisms and the consequences on local residents, the halting of gene flow amongst the wildlife populations, and the physical intrusion and/or noise pollution adversely affecting the quality of habitat for local species. Based on these concerning issues, it is crucial for a sustainable solution to be developed and implemented in appropriate areas within Kingston and the surrounding Frontenac County. Our approach involves an extensive literature review, which will assist us in observing similar problems around the globe, as well as various solutions that have been executed to fix these said problems. Furthermore, we will conduct a thorough investigation of local organizations’ existing studies to obtain relevant data and statistics which will assist us in determining the effects high-traffic freeways have on the surrounding ecological environment. It is through this research that we hope to present valid findings on the multilane highways impact to local ecosystems and landscapes, as well as produce possible planning options for intervention and suggest key areas for further examination.
3. Local and Landscape-Scale Variables Influencing the Use of Ponds by Wood Frogs (Lithobates sylvaticus) in the Shakwak Valley, Yukon
Authors: Brehaut Lucas
Published: April 2021

A global decline in amphibian population numbers has generated a large body of research focused on amphibian habitat selection and species diversity conservation. The purpose of this study was to analyze the significance of both local and landscape-scale variables on wood frog (Lithobates sylvaticus) pond habitat selection in the Shakwak Trench in Yukon, Canada. Presence or absence of wood frogs was used to determine pond occurrence values for 40 different ponds. Independent local variables were collected in the field and through the use of Geographic Information Systems (GIS). Landscape variables were derived with GIS and were analyzed under a 1000m buffer around the perimeter of the study ponds. Pond perimeter and dominant perimeter vegetation were significant local variables. Small ponds with a dominant sedge vegetation types seemed to be selected over larger ponds. Large lake area in the landscape buffers had a significant negative relationship for wood frog habitat selection. Significant variables in this study are similar to those in previous studies or can be linked to other important variables such as pond hydroperiod and total forested area. Results should be considered to act as preliminary findings in a much more comprehensive and complete future amphibian habitat selection study of the area.