bluuebunny/crossref_metadata_2025 huggingface dataset:
Characterising postgraduate students’ corpus query and usage patterns for disciplinary data-driven learning
Authors: Crosthwaite Peter , Wong Lillian L.C. , Cheung Joyce
Published: June 2019

Data-driven learning (DDL; Johns, 1991), involving students’ hands-on use of corpora for self-guided language learning, is a methodology now increasingly used in many tertiary contexts to enhance the teaching of disciplinary postgraduate thesis writing. However, there are still few studies tracking students’ actual engagement with corpora for DDL. This mixed-methods study reports on the tracking of students’ corpus use via a purpose-built corpus query and data visualisation platform integrated into a large postgraduate disciplinary thesis writing program at a university in Hong Kong. Data on corpus usage history (e.g. times of access, duration of use), query syntax (e.g. query lexis/phraseology and use of wildcards and part-of-speech tags), query function (e.g. frequency lists/distribution, concordance sorting and collocation) and query filters (e.g. searches by faculty, discipline, or thesis section) were collected from 327 students spanning over 11,000 individual corpus queries. The results show significant interdisciplinary and inter-/intra-user trends and variation in the use of particular corpus functions and query syntax adopted by corpus users. Students varied in the type of knowledge (e.g. domain-specific, language-specific) they were accessing, and frequently went beyond the exemplars of the DDL course materials to generate unique queries under their own initiative. Qualitative case study data from three corpus users’ activity logs also show distinctive individual corpus engagement by query frequency and function. These data provide a clearer insight into what students actually do during DDL and the different directions and trajectories that individual users take as a result of DDL. All accompanying DDL tasks are also included as supplementary materials.
L’intonation du français au Canada : Étude de cas des patrons intonatifs et des syllabes accentuées dans les variétés parlées au Nouveau-Brunswick et au Québec
Authors: Mamode Meï-Lan
Published: June 2019

À travers l’examen des contours intonatifs d’une variété de français parlée au Nouveau-Brunswick (FNB), nous cherchons d’abord à vérifier l’hypothèse prédisant que l’intonation du français est sous-tendue par le patron sous-jacent /LHiLH*/, tel que décrit par Jun et Fougeron (2002) dans le cadre de la théorie métrique-autosegmentale. Notre but second est de déterminer si le FNB présente des particularités intonatives le distinguant du français québécois (FQ), la variété la plus parlée et la plus documentée au Canada. Pour ce faire, la parole semi-spontanée de trois locuteurs de chaque variété est analysée. Nous comparons les types de contours intonatifs, la fréquence d’apparition de ces contours, ainsi que deux propriétés phonétiques (soit la hauteur de la fréquence fondamentale et la durée) des syllabes accentuées dans les deux variétés. Les contours répertoriés démontrent qu’effectivement, l’intonation du FNB est régie par le patron /LHiLH*/, mais que cette variété fait état d’une prédominance de continuités descendantes. L’analyse des paramètres phonétiques des syllabes accentuées révèle que le FNB privilégie l’usage de la durée à la frontière des syntagmes accentuels non finaux, tout en exhibant des variations de durée syllabique importantes en fonction de la position du syntagme accentuel dans la phrase.
The AKP Government from its Formation to the Popular Uprising in June 2013 (Part I)
Authors: Gündoğan Ercan
Published: June 2019

The article starts with the analysis of the origin and development of the Justice and Development Party (AKP) until the 2013 Gezi Uprisings. It tries to show that the AKP first tried to survive in a defensive manner in the so-called ‘Kemalist secular republic’, and thus established strategic relations with non- or anti-Kemalist sections of society. It then chose an offensive strategy to maintain its power against attacks from traditional political and ideological forces in Turkey, such as the army, mainstream political parties and the official ideology of the Republic. However, it is argued that the more power it accumulates the more it loses or leaves its allies and the more it is alienated. As a result, it becomes more authoritarian. The article will be followed by a second part to be published in the next issue of this journal, which deals with the reactions to AKP’s authoritarian and offensive politics and ideology, and the new measures AKP has taken for its survival.
Quantifying Morphology and Diffusion Properties of Mesoporous Carbon From High-Fidelity 3D Reconstructions
Authors: Wang Wu , Svidrytski Artur , Wang Di , Villa Alberto , Hahn Horst , Tallarek Ulrich , Kübel Christian
Published: June 2019

A reliable quantitative analysis in electron tomography, which depends on the segmentation of the three-dimensional reconstruction, is challenging because of constraints during tilt-series acquisition (missing wedge) and reconstruction artifacts introduced by reconstruction algorithms such as the Simultaneous Iterative Reconstruction Technique (SIRT) and Discrete Algebraic Reconstruction Technique (DART). We have carefully evaluated the fidelity of segmented reconstructions analyzing a disordered mesoporous carbon used as support in catalysis. Using experimental scanning transmission electron microscopy (STEM) tomography data as well as realistic phantoms, we have quantitatively analyzed the effect on the morphological description as well as on diffusion properties (based on a random-walk particle-tracking simulation) to understand the role of porosity in catalysis. The morphological description of the pore structure can be obtained reliably both using SIRT and DART reconstructions even in the presence of a limited missing wedge. However, the measured pore volume is sensitive to the threshold settings, which are difficult to define globally for SIRT reconstructions. This leads to noticeable variations of the diffusion coefficients in the case of SIRT reconstructions, whereas DART reconstructions resulted in more reliable data. In addition, the anisotropy of the determined diffusion properties was evaluated, which was significant in the presence of a limited missing wedge for SIRT and strongly reduced for DART.
STOCHASTIC NONLINEAR SCHRÖDINGER EQUATION WITH ALMOST SPACE–TIME WHITE NOISE
Authors: FORLANO JUSTIN , OH TADAHIRO , WANG YUZHAO
Published: June 2019

We study the stochastic cubic nonlinear Schrödinger equation (SNLS) with an additive noise on the one-dimensional torus. In particular, we prove local well-posedness of the (renormalized) SNLS when the noise is almost space–time white noise. We also discuss a notion of criticality in this stochastic context, comparing the situation with the stochastic cubic heat equation (also known as the stochastic quantization equation).
Auswirkungen außerfamiliärer frühkindlicher Betreuung auf die Entwicklung psychischer Auffälligkeiten, Risikoverhaltens und schulischer Leistung im Jugendalter
Authors: Schulz Wolfgang , Bothe Tim , Hahlweg Kurt
Published: June 2019

Zusammenfassung. Internationale Studien zu den langfristigen Auswirkungen außerfamiliärer frühkindlicher Betreuung (AFB) auf die psychische Gesundheit zeigen differentielle Effekte in Abhängigkeit der Qualität der Betreuung, dem Eintrittsalter und dem Ausmaß sozialer Benachteiligung. Die Anzahl deutscher Studien dazu ist jedoch gering. In einer deutschen Längsschnittstudie an 249 Familien wird untersucht, welche Auswirkungen AFB auf die Entwicklung psychischer Auffälligkeiten, Risikoverhalten und die Schulleistung im Jugendalter ( M=14.4 Jahre) hat. AFB führt im Vergleich zu elterlicher Betreuung zu signifikant höheren Werten psychischer Auffälligkeiten im Jugendalter. Migrationshintergrund und der Erziehungsstatus sind relevante Moderatoren. Ein frühes Eintrittsalter in die institutionelle Betreuung korreliert mit mehr psychischen Auffälligkeiten. Bei der Entscheidung von Eltern für AFB sollten das Eintrittsalter, die Qualität der Betreuung und die eigene soziale Situation berücksichtigt werden.
Transcriptome sequence resource for the cucurbit powdery mildew pathogen Podosphaera xanthii
Authors: De Miccolis Angelini Rita Milvia , Pollastro Stefania , Rotondo Palma Rosa , Laguardia Cataldo , Abate Domenico , Rotolo Caterina , Faretra Francesco
Published: June 2019

Podosphaera xanthiiis the main causal agent of cucurbit powdery mildew in Southern Italy. Illumina sequencing of mRNA from twoP. xanthiiisolates of opposite mating types (MAT1-1andMAT1-2) and their sexual cross was used to obtain a detailedde novoTrinity-based assembly of the transcriptome of the fungus. Over 60 million of high-quality paired-end reads were obtained and assembled into 71,095 contigs corresponding to putative transcripts that were functionally annotated. More than 55% of the assembled transcripts (40,221 contigs) had a significant hit in BLASTx search and included sequences related to sexual compatibility and reproduction, as well as several classes of transposable elements and putative mycoviruses. The availability of these new transcriptomic data and investigations on potential source of genetic variation inP. xanthiiwill promote new insights on the pathogen and its interactions with host plants and associated microbiome.
Transcriptome analysis provides insights into the stress response crosstalk in apple (Malus × domestica) subjected to drought, cold and high salinity
Authors: Li Xingliang , Li Minji , Zhou Beibei , Yang Yuzhang , Wei Qinping , Zhang Junke
Published: June 2019

Drought, cold, and high salinity are three major abiotic stresses effecting apple tree growth and fruit production. Understanding the genetic mechanisms of crosstalk between stress responses signalling networks and identifying the genes involved in apple has potential importance for crop improvement and breeding strategies. Here, the transcriptome profiling analysis of in vitro-grown apple plants subjected to drought, cold and high salinity stress, showed a total of 377 upregulated and 211 downregulated common differentially expressed genes (DEGs) to all 3 stress treatments compared with the control. Gene Ontology (GO) analysis indicated that these common DEGs were enriched in ‘metabolic process’ under the ‘biological process’ category, as well as in ‘binding’ and ‘catalytic activity’ under the ‘molecular function’ category. Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis showed that common DEGs were mainly belong to the ‘biological functions’ category and 17 DEGs were identified in ‘environmental information processing’ sub-category which may act as signal transduction components in response crosstalk regulation. Overexpression of 5 upregulated genes individually, out of these 17 common DEGs in apple calli promoted the consistent upregulation of DREB6, CBF1 and ZAT10 and increased the mass weight and antioxidase ability, implying these five common DEGs involved in multiple pathways and improved comprehensive resistance to stress.
Cryo-EM reveals the structural basis of long-range electron transport in a cytochrome-based bacterial nanowire
Authors: Filman David J. , Marino Stephen F. , Ward Joy E. , Yang Lu , Mester Zoltán , Bullitt Esther , Lovley Derek R. , Strauss Mike
Published: June 2019

Electrically conductive pili from Geobacter species, termed bacterial nanowires, are intensely studied for their biological significance and potential in the development of new materials. Using cryo-electron microscopy, we have characterized nanowires from conductive G. sulfurreducens pili preparations that are composed solely of head-to-tail stacked monomers of the six-heme C-type cytochrome OmcS. The unique fold of OmcS — closely wrapped around a continuous stack of hemes that can serve as an uninterrupted path for electron transport — generates a scaffold that supports the unbranched chain of hemes along the central axis of the filament. We present here, at 3.4 Å resolution, the structure of this cytochrome-based filament and discuss its possible role in long-range biological electron transport.
MicroTools enables automated quantification of capillary density and red blood cell velocity in handheld vital microscopy
Authors: Hilty Matthias Peter , Guerci Philippe , Ince Yasin , Toraman Fevzi , Ince Can
Published: June 2019

Direct assessment of capillary perfusion has been prioritized in hemodynamic management of critically ill patients in addition to optimizing blood flow on the global scale. Sublingual handheld vital microscopy has enabled online acquisition of moving image sequences of the microcirculation, including the flow of individual red blood cells in the capillary network. However, due to inherent content complexity, manual image sequence analysis remained gold standard, introducing inter-observer variability and precluding real-time image analysis for clinical therapy guidance. Here we introduce an advanced computer vision algorithm for instantaneous analysis and quantification of morphometric and kinetic information related to capillary blood flow in the sublingual microcirculation. We evaluated this technique in a porcine model of septic shock and resuscitation and cardiac surgery patients. This development is of high clinical relevance because it enables implementation of point-of-care goal-directed resuscitation procedures based on correction of microcirculatory perfusion in critically ill and perioperative patients.
Carbon-based quantum particles: an electroanalytical and biomedical perspective
Authors: Nekoueian Khadijeh , Amiri Mandana , Sillanpää Mika , Marken Frank , Boukherroub Rabah , Szunerits Sabine
Published: June 2019

Carbon-based quantum particles, especially spherical carbon quantum dots (CQDs) and nanosheets like graphene quantum dots (GQDs), are an emerging class of quantum dots with unique properties owing to their quantum confinement effect.
Novel halogenated pyrido[2,3-a]carbazoles with enhanced aromaticity as potent anticancer and antioxidant agents: rational design and microwave assisted synthesis
Authors: Saravanabhavan Munusamy , Badavath Vishnu Nayak , Maji Siddhartha , Muhammad Shabbir , Sekar Marimuthu
Published: June 2019

Design and synthesis a series of pyrido[2,3-a]carbazoles for their anticancer and antioxidant activity.
A semiconductor quantum dot-based ratiometric electrochemical aptasensor for the selective and reliable determination of aflatoxin B1
Authors: Wang Chengquan , Qian Jing , An Keqi , Lu Xiaoting , Huang Xingyi
Published: June 2019

A ratiometric electrochemical aptasensor was developed for the selective and reliable determination of aflatoxin B1 with an inherent reference signal.
Correction: Antioxidant properties of ALD grown nanoceria films with tunable valency
Authors: Gupta Ankur , Sakthivel Tamil S. , Neal Craig J. , Koul Supriya , Singh Sushant , Kushima Akihiro , Seal Sudipta
Published: June 2019

Correction for ‘Antioxidant properties of ALD grown nanoceria films with tunable valency’ by Ankur Gupta et al., Biomater. Sci., 2019, DOI: 10.1039/c9bm00397e.
Branch migration based selective PCR for DNA mutation enrichment and detection
Authors: Chen Na , Ouyang Xiaofei , Lin Meng , Liu Na , Wu Tongbo , Xiao Xianjin
Published: June 2019

A selective PCR for the enrichment of low-abundance mutations by introducing a branch migration blocker into the PCR process.
Interfacial restructuration of carbon nitride polymers for visible-light photocatalysis
Authors: Lin Feng , Yu Zihao , Wang Xinchen
Published: June 2019

Photocatalyst surface restructuration is of immense practical importance for solar energy utilization.
External oxidant-free oxidation/[3+2] cycloaddition/aromatization cascade: electrochemical synthesis of polycyclic N-heterocycles
Authors: Wang Qiang , Yuan Ting , Liu Qiang , Xu Yong , Xie Guanqun , Lv Xin , Ding Shujiang , Wang Xiaoxia , Li Chen
Published: June 2019

The extent of the electrochemical oxidative [3+2] cycloaddition/aromatization cascade can be regulated with the assistance of redox mediators. Isoquinolinium salts as alternative azomethine ylide precursors afforded fully aromatized N-heterocycles.
Halogen bonding in differently charged complexes: basic profile, essential interaction terms and intrinsic σ-hole
Authors: Zhu Zhengdan , Wang Guimin , Xu Zhijian , Chen Zhaoqiang , Wang Jinan , Shi Jiye , Zhu Weiliang
Published: June 2019

“Intrinsic electrophilicity” and “intrinsic nucleophilicity” enable the formation of all differently charged halogen bonds.
4/6-Herto-arm and 4/6-mikto-arm star-shaped block polymeric drug-loaded micelles and their pH-responsive controlled release properties: a dissipative particle dynamics simulation
Authors: Wu Wensheng , Yi Peng , Zhang Jing , Cheng Yingchao , Li Zhiwei , Hao Xiangying , Chen Quan
Published: June 2019

Star-shaped polymers have received significant attention and have been widely developed for prospective applications in drug delivery owing to their topological structure and unique physiochemical characteristics.
The direct observation of the doorway 1nπ* state of methylcinnamate and hydrogen-bonding effects on the photochemistry of cinnamate-based sunscreens
Authors: Kinoshita Shin-nosuke , Inokuchi Yoshiya , Onitsuka Yuuki , Kohguchi Hiroshi , Akai Nobuyuki , Shiraogawa Takafumi , Ehara Masahiro , Yamazaki Kaoru , Harabuchi Yu , Maeda Satoshi , Ebata Takayuki
Published: June 2019

The electronic states and photochemistry including nonradiative decay (NRD) and trans(E) → cis(Z) isomerization of methylcinnamate (MC) and its hydrogen-bonded complex with methanol have been investigated under jet-cooled conditions.
The effect of π–π stacking interaction of the indole ring with the coordinated phenoxyl radical in a nickel(ii)-salen type complex. Comparison with the corresponding Cu(ii) complex
Authors: Oshita Hiromi , Suzuki Takashi , Kawashima Kyohei , Abe Hitoshi , Tani Fumito , Mori Seiji , Yajima Tatsuo , Shimazaki Yuichi
Published: June 2019

A side-chain indole ring showed stacking interaction with the Ni(ii)-phenoxyl radical, but had smaller effects in comparison with that of the Cu(ii)-phenoxyl radical.
Protective effect of polaprezinc on cadmium-induced injury of lung epithelium
Authors: Kimura Kazuma , Nakano Yukari , Sugizaki Toshifumi , Shimoda Mikako , Kobayashi Nahoko , Kawahara Masahiro , Tanaka Ken-ichiro
Published: June 2019

Cadmium is a toxic metal contained in food, water and the atmosphere, and exposure to cadmium can cause respiratory diseases in humans. Various health problems caused by cadmium result from oxidative stress-dependent cellular injury. Metallothioneins are intracellular, cysteine-rich, metal-binding proteins that have a detoxifying action on heavy metals such as cadmium in various organs. In addition, expression of metallothioneins is induced by metals with low biological toxicity, such as zinc. Therefore, in this study we examined whether polaprezinc, a chelate compound consisting of carnosine and zinc, can suppress cadmium-induced lung epithelial cell death. We found that cell viability markers (intracellular ATP levels and mitochondrial activity) and cytotoxicity (lactate dehydrogenase release) were decreased and increased, respectively by cadmium treatment; however, polaprezinc significantly reversed these changes. Moreover, cadmium-dependent endoplasmic reticulum stress responses were suppressed by polaprezinc treatment. We then examined the protective mechanisms of polaprezinc, focusing on oxidative stress. Cadmium induced the production of reactive oxygen species (ROS) in A549 cells in a dose-dependent manner and polaprezinc significantly suppressed this cadmium-induced ROS production. Finally, we examined whether polaprezinc exerts an antioxidative action by inducing metallothioneins. We found that polaprezinc dose-dependently induced metallothioneins using real-time RT-PCR, ELISA, and western blotting analyses. These results indicate that polaprezinc can suppress cadmium-induced lung epithelial cell death and oxidative stress by inducing metallothioneins. We therefore suggest that polaprezinc may have therapeutic effects against respiratory diseases, such as chronic obstructive pulmonary disease and idiopathic pulmonary fibrosis.
A MoS2–MWCNT based fluorometric nanosensor for exosome detection and quantification
Authors: Tayebi Mahnoush , Tavakkoli Yaraki Mohammad , Yang Hui Ying , Ai Ye
Published: June 2019

Exosomes are nanosized extracellular vesicles containing molecular information from their parental cells. Detection and quantification of exosomes can offer a non-invasive method for an early diagnosis of diseases such as cancer.
Nanosized-bulk V-containing mixed-oxide catalysts: a strategy for the improvement of the catalytic materials properties
Authors: López-Medina Ricardo , Guerrero-Pérez M. Olga , Bañares Miguel A.
Published: June 2019

A series of nanosized-bulk-supported Mo–V–Nb–Te catalysts was prepared. Using a new synthesis approach, nanocrystalline aggregates of the active phase were deposited on a support.
Tungsten-inert gas welding electrodes as low-cost, green and pH-universal electrocatalysts for the hydrogen evolution reaction
Authors: Hashemniaye-Torshizi Reihaneh , Ashraf Narges , Arbab-Zavar Mohammad Hossein , Dianat Somayeh
Published: June 2019

Lanthanated tungsten electrodes were shown to be green, durable, low-cost, pH-universal and efficient electrocatalysts for the hydrogen evolution reaction.
Disentangling the role of oxygen vacancies on the surface of Fe3O4 and γ-Fe2O3
Authors: Jian Wei , Wang Shi-Ping , Zhang Hong-Xing , Bai Fu-Quan
Published: June 2019

The role of oxygen vacancies on Fe3O4 and γ-Fe3O4 (111) surfaces is clarified to investigate molecular oxygen activation.
An intermediate metastable ferroelectric state induced giant functional responses in Bi0.5Na0.5TiO3 ceramics
Authors: Zhou Changrong , Zhang Yongsheng , Wang Yufan , Li Qingning , Xu Jiwen , Chen Guohua , Yuan Changlai , Rao Guanghui
Published: June 2019

The local heterogeneities and phase transition in the ferroelectric Bi0.5Na0.5TiO3 have a profound impact on the electrical properties.
Allosteric, transcriptional and post-translational control of mitochondrial energy metabolism
Authors: Karwi Qutuba G. , Jörg Alice R. , Lopaschuk Gary D.
Published: June 2019

The heart is the organ with highest energy turnover rate (per unit weight) in our body. The heart relies on its flexible and powerful catabolic capacity to continuously generate large amounts of ATP utilizing many energy substrates including fatty acids, carbohydrates (glucose and lactate), ketones and amino acids. The normal health mainly utilizes fatty acids (40–60%) and glucose (20–40%) for ATP production while ketones and amino acids have a minor contribution (10–15% and 1–2%, respectively). Mitochondrial oxidative phosphorylation is the major contributor to cardiac energy production (95%) while cytosolic glycolysis has a marginal contribution (5%). The heart can dramatically and swiftly switch between energy-producing pathways and/or alter the share from each of the energy substrates based on cardiac workload, availability of each energy substrate and neuronal and hormonal activity. The heart is equipped with a highly sophisticated and powerful mitochondrial machinery which synchronizes cardiac energy production from different substrates and orchestrates the rate of ATP production to accommodate its contractility demands. This review discusses mitochondrial cardiac energy metabolism and how it is regulated. This includes a discussion on the allosteric control of cardiac energy metabolism by short-chain coenzyme A esters, including malonyl CoA and its effect on cardiac metabolic preference. We also discuss the transcriptional level of energy regulation and its role in the maturation of cardiac metabolism after birth and cardiac adaptability for different metabolic conditions and energy demands. The role post-translational modifications, namely phosphorylation, acetylation, malonylation, succinylation and glutarylation, play in regulating mitochondrial energy metabolism is also discussed.
RF mirror media‐based space‐time block coded spatial modulation techniques for two time‐slots
Authors: Adejumobi Babatunde S. , Pillay Narushan
Published: June 2019

Space‐time block coded spatial modulation (STBC‐SM) with cyclic structure (STBC‐CSM) employs cyclical rotation of activated transmit antenna pairs to transmit Alamouti codewords taken from two different constellation sets to improve the spectral efficiency of STBC‐SM. Furthermore, existing literature has shown that media‐based modulation (MBM), which employs radio frequency (RF) mirrors demonstrate significant improvement in error performance of wireless systems. Hence, this study proposes the application of MBM to STBC‐CSM and STBC‐SM in the form of media‐based STBC‐CSM (MBSTBC‐CSM) and MBSTBC‐SM, respectively. The theoretical framework of the union‐bound on average bit‐error probability of M‐QAM MBSTBC‐CSM and MBSTBC‐SM, for the maximum‐likelihood (ML) detector is formulated and agrees well with Monte Carlo simulations. Furthermore, due to the large computational complexity of the ML detector, the authors propose a low‐complexity near‐ML detector for MBSTBC‐CSM and MBSTBC‐SM, which achieves a near‐ML bit error rate performance with reduction in computational complexity.
Adaptive loss and capacitance‐reduction control strategy based on second‐harmonic circulating current injection for MMC
Authors: Jiang Huijie , Xiao Lan , Wang Chuyang
Published: June 2019

The submodule (SM) capacitance value of a modular multilevel converter (MMC) is so large that the reliability and cost of the MMC are affected. By existing methods of second‐harmonic circulating current injection with a closed‐loop control strategy, the SM capacitance value can be greatly reduced. However, the design of the SM capacitance value is not given, and extra loss is brought in. This study gives the design of the SM capacitance value when the second‐harmonic circulating current is injected with a closed‐loop control strategy. Then, an adaptive control method based on SM capacitor voltage fluctuation feedback is proposed to reduce the extra loss caused by the second‐harmonic circulating current injection. In addition, for the case without SM capacitor voltage sensors, a method based on real‐time calculation of the injected second‐harmonic circulating current is proposed to reduce the extra loss without SM capacitor voltage sensors. Finally, the accuracy of the design and the validity of the proposed methods are verified by simulation and experimental results.
Modified multilevel buck–boost converter with equal voltage acrosseach capacitor: analysis and experimental investigations
Authors: Bhaskar Mahajan Sagar , Al‐ammari Rashid , Meraj Mohammad , Iqbal Atif , Padmanaban Sanjeevikumar
Published: June 2019

Recently, the circuitry of Multilevel Buck‐Boost Converter (here, calledMBBC1) is suggested in the literature to attain high invertingvoltage by increasing the output levels of the classical buck‐boost converter.However, the only circuitry is suggested and detail investigations are notprovided. The major drawbacks of MBBC1 are the voltages across theload capacitors side are unequal and the input current is not continuous.Therefore, the MBBC1 is not well suited to feed multilevel inverterwhere a stack of capacitors is required with equal voltage across eachcapacitor. A new modified MBBC called MBBC2 is proposed to achievecontinuous input current and equal voltage across each capacitor. The circuitryof MBBC1 and MBBC2 configurations are analysed withnon‐idealities to investigate its effects on the voltage conversion ratio. TheContinuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM)boundary conditions and modes of operation for MBBC1 andMBBC2 configurations are presented. The procedure for basicsdesign and components selection is elaborated. Additionally, comparison ofMBBC1, MBBC2 and recently proposed a non‐isolatedDC‐DC configuration is provided. The performances of MBBC1 andMBBC2 configurations are tested with simulation and experimentalwork, and obtained results consistently show a good agreement with thetheoretical approach..
High‐frequency resonant operation of an integrated medium‐voltage SiC MOSFET power module
Authors: Jørgensen Asger Bjørn , Aunsborg Thore Stig , Bęczkowski Szymon , Uhrenfeldt Christian , Munk‐Nielsen Stig
Published: June 2019

Industrial processes which use induction and dielectric heating are still relying on resonant converters based on vacuum tubes. New emerging medium‐voltage silicon carbide (SiC) semiconductor power devices have a potential to replace vacuum tubes and allow for more efficient and compact converters in the high‐frequency range. High‐voltage packages have been proposed in the literature that are suitable for the 10 kV SiC metal–oxide–semiconductor field‐effect transistors (MOSFETs), and its fast voltage switching capabilities in hard‐switched applications have been demonstrated. However, no packaging is presented which allows the high‐frequency operation of a 10 kV SiC MOSFET die. This study proposes the design of a power module for MHz resonant operation of a 10 kV SiC MOSFET. At high switching frequencies, the gate losses become substantial, thus the gate driver is included inside the power module package to ensure a low inductive and high thermally conductive design as seen from the gate driver. The inductance of the proposed power module layout structure is evaluated using ANSYS Q3D Extractor. The thermal performance of the integrated gate‐driver circuitry is experimentally verified. Finally, the resonant operation of a medium‐voltage SiC MOSFET power module is demonstrated experimentally at 1 MHz.
Classification of low-luminosity stellar X-ray sources in the field of the Draco dwarf spheroidal galaxy
Authors: Saeedi Sara , Sasaki Manami , Stelzer Beate , Ducci Lorenzo
Published: June 2019

Aims. A previous study of the X-ray luminosity function of the X-ray sources in the Draco dwarf spheroidal (dSph) galaxy field indicates the presence of a population of unknown X-ray sources in the soft energy range of 0.5–2 keV. In 2015, there were twenty-six further deep XMM-Newton observations of Draco dSph, providing an opportunity for a new study of the as yet unclassified sources.

Methods. We applied the classification criteria presented in our previous multi-wavelength study of the X-ray sources of the Draco dSph to the sources detected in the combined 2009 and 2015 XMM-Newton data set. These criteria are based on X-ray studies and properties of the optical, near-infrared, and mid-infrared counterparts and allows us to distinguish background active galactic nuclei (AGNs) and galaxies from other types of X-ray sources. In this work we performed X-ray spectral and timing analyses for fifteen sources in the field of Draco dSph with stellar counterparts.

Results. We present the classification of X-ray sources, for which the counterpart is identified as a stellar object based on our criteria from multi-wavelength data. We identify three new symbiotic stars in the Draco dSph with X-ray luminosities between ∼3.5 × 1034 erg s−1 and 5.5 × 1034 erg s−1. The X-ray spectral analysis shows that two of the classified symbiotic stars are β-type. This is the first identification of this class of symbiotic stars in a nearby galaxy. Eight sources are classified as Galactic M dwarfs in the field of the Draco dSph. These M dwarfs are between ∼140 and 800 pc distant, with X-ray luminosities are between 1028 and 1029 erg s−1 and logarithmic ratios of X-ray to bolometric luminosity, log(LX/Lbol), between −3.4 and −2.1. The multiple observations allowed us to investigate flare activity of the M dwarfs. For 5 M dwarfs flare(s) are observed with a significance of > 3σ level of confidence. Moreover, we classified three foreground sources, located at distances of the order of ∼1–3 kpc in the field of the Draco dSph. Based on both the X-ray luminosities of these foreground sources (> 1030 erg s−1) and their optical counterparts (late type G or K stars), these X-ray sources are classified as candidates of contact binary systems.

Conclusions. Our study of X-ray sources of the Draco dSph shows that accreting white dwarfs are the most promising X-ray population of dSphs, which is in line with theoretical expectations. The number of Galactic M dwarfs detected at our X-ray sensitivity limit is consistent with the expectation based on the space density of M dwarfs.
High-resolution observations with ARTEMIS-JLS and the NRH
Authors: Alissandrakis C. E. , Bouratzis C. , Hillaris A.
Published: June 2019

Aims. We study the characteristics of intermediate drift bursts (fibers) embedded in a large type-IV event.

Methods. We used high-sensitivity, low-noise dynamic spectra obtained with the acousto-optic analyzer (SAO) of the ARTEMIS-JLS solar radiospectrograph, in conjunction with high time-resolution images from the Nançay radioheliograph (NRH) and extreme ultraviolet (EUV) images from the Transition Region and Coronal Explorer (TRACE) to study fiber bursts during the large solar event of July 14, 2000. We computed both 2D and 1D images and applied high pass time filtering to the images and the dynamic spectrum in order to enhance the fiber-associated emission. For the study of the background continuum emission we used images averaged over several seconds.

Results. Practically all fibers visible in the SAO dynamic spectra are identifiable in the NRH images. Fibers were first detected after the primary energy release in a moving type-IV event, probably associated with the rapid eastward expansion of the flare and the post-flare loop arcade. We found that fibers appeared as a modulation of the continuum intensity with a root mean square value of the order of 10%. Both the fibers and the continuum were strongly circularly polarized in the ordinary mode sense, indicating plasma emission at the fundamental. We detected a number of discrete fiber emission sources along two parallel stripes of ∼300 Mm in length, apparently segments of large-scale loops encompassing both the EUV loops and the CME-associated flux rope. We found cases of multiple fiber emissions appearing at slightly different positions and times; their consecutive appearance can give the impression of apparent motion with supra-luminal velocities. Images of individual fibers were very similar at 432.0 and 327.0 MHz. From the position shift of the sources and the time delays at low and high frequencies, we estimated the exciter speed and the frequency scale length along the loops for a well-observed group of fibers; we obtained consistent values from imaging and spectral data, supporting the whistler origin of the fiber emission. Finally we found that fibers in emission and fibers in absorption are very similar, confirming that they are manifestations of the same wave train.
The complex case of MACS J0717.5+3745 and its extended filament: intra-cluster light, galaxy luminosity function, and galaxy orientations
Authors: Ellien A. , Durret F. , Adami C. , Martinet N. , Lobo C. , Jauzac M.
Published: June 2019

Context. The properties of galaxies are known to be affected by their environment, but although galaxies in clusters and groups have been quite thoroughly investigated, little is known about galaxies belonging to filaments of the cosmic web, or about the properties of the filaments themselves.

Aims. Here we investigate the properties of the rich cluster MACS J0717.5+3745 and its extended filament by analyzing the distribution and fractions of intra-cluster light (ICL) in its core and by trying to detect intra-filament light (IFL) in the filament. We analyze the galaxy luminosity function (GLF) of the cluster core and of the filament. We also study the orientations of galaxies in the filament to better constrain the filament properties.

Methods. This work is based on Hubble Space Telescope (HST) archive data, both from the Hubble Frontier Fields in the F435W, F606W, F814W, and F105W bands, and from a mosaic of images in the F606W and F814W bands. The spatial distribution of the ICL was determined with our new wavelet-based software, DAWIS. The GLFs were extracted in the F606W and F814W bands, with a statistical subtraction of the background, and fit with Schechter functions. The galaxy orientations in the filaments were estimated with SExtractor after correction for the point spread function.

Results. We detect a large amount of ICL in the cluster core, but no IFL in the cosmic filament. The fraction of ICL in the core peaks in the F606W filter before decreasing with wavelength. Though relatively noisy, the GLFs in the filament are notably different from those of field galaxies, with a flatter faint end slope and an excess of bright galaxies. We do not detect a significant alignment of the galaxies in the filament region analyzed.
Discovery of the first Ca-bearing molecule in space: CaNC
Authors: Cernicharo J. , Velilla-Prieto L. , Agúndez M. , Pardo J. R. , Fonfría J. P. , Quintana-Lacaci G. , Cabezas C. , Bermúdez C. , Guélin M.
Published: June 2019

We report on the detection of calcium isocyanide, CaNC, in the carbon-rich evolved star IRC+10216. We derived a column density for this species of (2 ± 0.5) × 1011 cm−2. Based on the observed line profiles and the modelling of its emission through the envelope, the molecule has to be produced in the intermediate and outer layers of the circumstellar envelope where other metal-isocyanides have previously been found in this source. The abundance ratio of CaNC relative to MgNC and FeCN is ≃1/60 and ≃1, respectively. We searched for the species CaF, CaCl, CaC, CaCCH, and CaCH3 for which accurate frequency predictions are available. Only upper limits have been obtained for these molecules.
Analysis of the dependence of the parameters of the generalized Peukert’s equations on the capacity for nickel-cadmium batteries
Authors: Galushkin Nikolay E. , Galushkin Dmitriy N. , Yazvinskaya Nataliya N. , Gukov Sergei P.
Published: June 2019

In this paper, the use possibility was analyzed of the most wellknown generalized Peukert’s equations, for computing of released capacity of nickel-cadmium batteries at different discharge currents. It was proved that these equations correspond well to experimental data throughout the entire variation interval of discharge currents. It was shown that the parameter n does not depend on a nominal capacity of a batteries under examination. Farther, it was shown that a functional dependence of a battery’s released capacity with a discharge current is determined by the statistical phase transition subjected to the normal distribution law.
Hydro-Liquefaction of Tile-Like Barzas Coals in the Presence of Some Transition Metal Additives
Authors: Petrov Ivan , Ushakov Konstantin , Sozinov Sergey , Bogomolov Alexander
Published: June 2019

Using a laboratory micro-autoclave (of ~ 20 cm3 volume), the effects of transition metal additives (MoO3, Fe2O3 and commercial AlCoMo catalyst) on the thermal transformations of tile-like Barzas coals (sapromixites) in a hydrogen medium at T ~ 475°C and P ~ 6.0-7.5 MPa have been studied. It has been shown that catalytic additives under investigation somewhat suppress gas formation processes, facilitating the increase in H/C atomic ratios and in the amount of alkyl-containing structures in resin-like solid products of Barzas coal hydro-liquefaction. Maximal yields of “coal liquids” (maltenes + asphaltenes) (~ 35 wt.%, daf basis) were obtained during the heat treatment of sapromixites in the presence of bb1 wt.% MoO3.
Computer Simulation of the Physical Processes of Electroosmotic Soil Treatment
Authors: Gucal Maxim , Pokatilov Andrey
Published: June 2019

An algorithm for determining the electrical and hydrodynamic parameters of soils during their electroosmotic treatment is presented. The results of computer simulation of non-stationary physical processes occurring in clay soils during the flow of electric current without the introduction of active solutions are given.
State and Conservancy of Water Resources When Mining
Authors: Ignatova Alla , Papin Andrey , Solodov Vyacheslav
Published: June 2019

Coal mining and processing is associated with environmental pollution at all stages. The impact is on all components of the biosphere. The analysis of the current state of minor rivers of the Kemerovo Region, flowing in areas of active mining operation, is presented in the article. The activities of coal mining enterprises, aimed at reducing the negative impact on water resources, are considered.
The Semantic Network as a Promising Information Platform in the Mining Industry
Authors: Alkhanova Gulnur , Stenin Dmitry , Zhuzbaev Serik
Published: June 2019

The issues of digitalization of the mining industry, including open-pit mining, are considered. The issues of the use of semantic systems as an element of information flows, allowing to determine and select the right decisions in the process of mining management, in particular, in the mining of minerals by open mining, are covered. The article formulates requirements for semantic networks for the description of material in computer-aided learning tools and analyzes the most well-known models of semantic networks.
Reducing the Unit Costs of Supplying Drilling Rigs with Spare Parts Based on Information Provided by the Neural Network Classifier
Authors: Abu-Abed Fares
Published: June 2019

Minimizing costs when organizing the supply of drilling rigs with spare parts is an important task. To do this, it is necessary to develop evaluation criteria or rely on information obtained from the monitoring system in real time. The paper proposes a model for processing the output of a drilling rig, depending on the possible strategy for operating the equipment. The work is an integral part of previously published developments presented in the materials of articles in 2-nd and 3-rd International innovative mining symposiums (2017-2018).
Neo-Industrial Structural Shifts in Sustainable Development Methodology
Authors: Zhironkin Sergey , Aleshina Olga , Gorev Vladimir , Gunyakov Yuriy , Zhironkina Olga
Published: June 2019

Human economic activity, production and use of goods and services take place in the framework of a close exchange of materials and energy with the environment. Entering into relationship with the natural environment, industrial enterprises form a dynamic ecological-and-economic system, which is a combination of two jointly functioning subsystems: ecological and economic. The main feature of the ecologicaland-economic system is the balance, proportionality, balance of its natural and industrial subsystems. In this regard, a necessary condition for the transition of economy to sustainable development should be the reduction of the environmental capacity of production through the introduction of a new business philosophy, which is based on greening processes. Environmental activities, as one of the components of a balanced development, are becoming more and more economically viable, allowing enterprises to use the various direct and indirect benefits and profits associated with it, preventing negative environmental impacts. Of particular importance is the expansion of the economic basis of environmental activities in the conditions of modern structural changes in the economy, radically changing the proportions of consumption of natural and intellectual resources. Today, such structural changes are neo-industrial in nature, marking a new stage in the development of global industry, with increasing digitalization of production and a drastic reduction in natural resource consumption as well as harmful emissions cut.
Environmental Challenges of Postindustrial Economy
Authors: Gvozdkova Tatiana , Lozhnikova Anna , Suslova Yulia , Anyona Seroni
Published: June 2019

The responsibility of the modern industrial society for the growth of the global environmental crisis does not raise any doubts. It is also generally accepted that the solution of global environmental problems is associated with a change in the way of life of the population of developed countries, whose maintenance at a high level requires a steady growth of the economy, which until recently was ensured by the extensive use of natural resources. The functioning of such a model of economic production has led not only to the depletion of natural potential, but also to the production of a huge amount of waste. The need to increase economic growth reflects a universal setting for the industrial (and later the post-industrial) society on the growth of the material well-being of the population. The lifestyle formed on the basis of consumer culture enlightens the relationship between society and environment, stimulating economic development, because a market economy cannot develop without an increase in consumption. The society responds to the new needs by accelerating scientific and technological progress to the postindustrial level, which, in accordance with the dominant attitudes in the public consciousness, is perceived both as a foundation of material well-being and as a foundation for the conquest of nature.
On the Issues of the Structural Methodology of Sustainable Development
Authors: Kovalevsky Sergey , Falaleev Albert , Gasanov Eyvaz , Konovalova Maria , Reimer Nadezhda
Published: June 2019

The whole world, including Russia, is on the verge of a third, after the agrarian and industrial, the digital technological revolution, no less, and perhaps more fundamental, than the two previous ones. A sustainable development strategy cannot be created on the basis of traditional universal human notions and values, stereotypes of thinking. It requires the development of new scientific and ideological approaches that correspond not only to modern realities, but also to the expected development prospects in the 3rd millennium. The transition to sustainable development involves the gradual restoration of natural ecosystems to a level that ensures the sustainability of the environment, and in which there is a real possibility for future generations of people to live up to their vital needs and interests. The formulation of a new development strategy means a structural changes during gradual integration into a single self-organizing system of economic, environmental and social spheres of activity. In this sense, sustainable development implies, at a minimum, structural efficiency and compatibility of the biosphere and the new digital world, social justice with a general decrease in anthropogenic pressure on the biosphere. However, the transition to sustainable development is the only alternative to the development of mankind, since the economics of technologically advanced countries are already forming the foundations of new structural changes that radically change the place of nature-intensive industries in meeting human needs.
Nature and Economy in the Mining Region: Holistic Approach
Authors: Zhernov Evgeny , Nekhoda Evgenia , Peters Dénes
Published: June 2019

The purpose of the study is to establish the relationship between the nature and the economy of the mining industry in the mining region in the context of the imminent depletion of the fuel and energy nonrenewable natural resources, which actualizes the research issue. The subject of the article is the qualitative relationship between nature and economy in the “nature -anthroposociety -economy” system. At the same time, the anthroposociety (man, society) is considered both as the creator of the economy, and as its condition along with nature. Much attention is paid to the world-view foundations of the issue -anthropocentrism and ecocentrism. In the study the issue of the relationship between nature and economy in the mining region is elaborated from the position of the holism methodology, which ensures the scientific novelty of the study. The scientific and practical significance of the study is in the establishment of the parity as a qualitative relationship between nature and economy in the mining region. This parity can be implemented to substantiate the transfer of the regional economic system of the Kemerovo region, an important mining region of Western Siberia, to a new resource-saving, high-tech and environmentally sound model of development.