bluuebunny/crossref_metadata_2025 huggingface dataset:
A cost-effective chitosan–oxine based thin film for a volatile acid vapour sensing application
Authors: Akhil Kumar M. M. , Biju V. M.
Published: April 2020

A polymer film based chemosensor was developed through the immobilization of chitosan and oxine, for the detection of TFA vapors.
Correction: Large-sized graphene oxide synergistically enhances parenchymal hepatocyte IL-6 expression monitored by dynamic imaging
Authors: Zhang Yulong , Ma Cong , Wang Zhengjun , Zhou Qianqian , Sun Sujing , Ma Ping , Lv Liping , Jiang Xinquan , Wang Xiaohui , Zhan Linsheng
Published: April 2020

Correction for ‘Large-sized graphene oxide synergistically enhances parenchymal hepatocyte IL-6 expression monitored by dynamic imaging’ by Yulong Zhang et al., Nanoscale, 2020, DOI: 10.1039/C9NR10713D.
Photocatalytic xanthate-based radical addition/cyclization reaction sequence toward 2-biphenyl isocyanides: synthesis of 6-alkylated phenanthridines
Authors: López-Mendoza Pedro , Miranda Luis D.
Published: April 2020

A photocatalytic xanthate-based radical addition/cyclization reaction cascade toward 2-biphenylisocyanides is described as a practical and modular approach to 6-alkylated phenanthridines.
From isoselectivity to syndioselectivity: Lewis base regulates stereochemistry in 2-vinylpyridine polymerization
Authors: Wang Yu , Duan Jiang-Bing , Liu Zhao-Xuan , Xu Tie-Qi
Published: April 2020

We have developed an effective synthesis of syndiotactic poly(2-vinylpyridine) by a novel catalytic system. Switching from isoselective to syndioselective polymerization was achieved by adding Lewis base.
Recent developments in palladium-catalyzed C–S bond formation
Authors: Li Jianxiao , Yang Shaorong , Wu Wanqing , Jiang Huanfeng
Published: April 2020

This review summarized the recent developments in palladium-catalyzed C–S bond formation involving sulfenylation and sulfonylation reactions.
Electro–opto–mechano driven reversible multi-state memory devices based on photocurrent in Bi0.9Eu0.1FeO3/La0.67Sr0.33MnO3/PMN-PT heterostructures
Authors: Wei Maocai , Liu Meifeng , Yang Lun , Li Xiang , Xie Yunlong , Wang Xiuzhang , Li Zijiong , Su Yuling , Hu Zhongqiang , Liu Jun-Ming
Published: April 2020

The mutual interaction between polarization switching, light and piezoelectric strain.
Degradation of p-nitrophenol by nano-pyrite catalyzed Fenton reaction with enhanced peroxide utilization
Authors: Liu Tong , Chen Nan , Deng Yang , Chen Fangxin , Feng Chuanping
Published: April 2020

Fenton oxidation of p-nitrophenol was accelerated 3 times using a nano-pyrite catalyst. Homogeneous Fenton rather than surface catalysis dominated the ˙OH generation. Nano-pyrite supported fast Fe2+ regeneration strengthens H2O2 utilization.
A one-dimensional infinite silver alkynyl assembly [Ag8(CCtBu)5(CF3COO)3(CH3CN)]n: synthesis, crystal structure and properties
Authors: Shi Ju-Feng , Chen Zhi-Jin , Zhang Liu-Jie , Zhou Kun , Ji Jiu-Yu , Bi Yan-Feng
Published: April 2020

A high-yield one-dimensional infinite silver alkynyl assembly [Ag8(CCtBu)5(CF3COO)3(CH3CN)]n (1) displays excellent photocurrent properties and temperature-sensitive luminescence properties.
Device performance limits and negative capacitance of monolayer GeSe and GeTe tunneling field effect transistors
Authors: Xu Peipei , Liang Jiakun , Li Hong , Liu Fengbin , Tie Jun , Jiao Zhiwei , Luo Jing , Lu Jing
Published: April 2020

The ML GeSe and GeTe NCTFETs fulfill the ITRS low power and high performance devices, respectively, at the “4/3” node range.
Identification of novel bacterial urease inhibitors through molecular shape and structure based virtual screening approaches
Authors: Imran Muhammad , Waqar Saba , Ogata Koji , Ahmed Mahmood , Noreen Zobia , Javed Sundus , Bibi Nazia , Bokhari Habib , Amjad Asma , Muddassar Muhammad
Published: April 2020

The enzyme urease is an essential colonizing factor of the notorious carcinogenic pathogen Helicobacter pylori (H. pylori), conferring acid resistance to the bacterium.
Thermal stabilities and conformational behaviors of isocyanurates and cyclotrimerization energies of isocyanates: a computational study
Authors: Uchimaru Tadafumi , Yamane Shogo , Mizukado Junji , Tsuzuki Seiji
Published: April 2020

Computational investigations on how the thermochemical stabilities of isocyanurate molecules depend on the substituents on the nitrogen atoms in the isocyanurate ring have been described.
Sarcosenones A–C, highly oxygenated pimarane diterpenoids from an endolichenic fungus Sarcosomataceae sp.
Authors: Hou Xintong , Xu Yang , Zhu Shuaiming , Zhang Yang , Guo Liangdong , Qiu Feng , Che Yongsheng
Published: April 2020

The new highly oxygenated pimarane diterpenoids sarcosenones A–C (1–3) were isolated from an endolichenic fungus Sarcosomataceae sp. Compound 1 showed moderate cytotoxicity towards human tumor cells.
Polysaccharides derived from Enteromorpha prolifera for the removal of silver nanoparticle-humic acid contaminants by a coagulation-ultrafiltration process
Authors: Zhao Shuang , Zhang Peng , Zou Zhangjian , Han Jing , Yang Weihua , Sun Qianshu
Published: April 2020

Applying Ep as a coagulant aid in C-UF process could simultaneously remove AgNPs and reduce membrane fouling.
Evolutionary chemical space exploration for functional materials: computational organic semiconductor discovery
Authors: Cheng Chi Y. , Campbell Josh E. , Day Graeme M.
Published: April 2020

Evolutionary optimisation and crystal structure prediction are used to explore chemical space for molecular organic semiconductors.
Quantifying the non-equilibrium activity of an active colloid
Authors: Eldeen Sarah , Muoio Ryan , Blaisdell-Pijuan Paris , La Ngoc , Gomez Mauricio , Vidal Alex , Ahmed Wylie
Published: April 2020

Active matter systems exhibit rich emergent behavior due to constant injection and dissipation of energy at the level of individual agents. We characterize the dissipation of single active colloids.
Incorporating graphene quantum dots to enhance the photoactivity of CdSe-sensitized TiO2nanorods for solar hydrogen production
Authors: Chang Yung-Shan , Hsieh Ping-Yen , Mark Chang Tso-Fu , Chen Chun-Yi , Sone Masato , Hsu Yung-Jung
Published: April 2020

By introducing GQDs to promote vectorial charge transfer, photocorrosion of CdSe-sensitized TiO2toward solar hydrogen production can be resolved.
ZIF-supported AuCu nanoalloy for ammonia electrosynthesis from nitrogen and thin air
Authors: Lv Xian-Wei , Wang Lu , Wang Guichang , Hao Ran , Ren Jin-Tao , Liu Xiaolu , Duchesne Paul N. , Liu Yuping , Li Wei , Yuan Zhong-Yong , Ozin Geoffrey A.
Published: April 2020

One step towards green ammonia: electrosynthesis of ammonia from nitrogen and thin air over a gold–copper nanoalloy-decorated zeolitic imidazolate framework.
Super-stretchable, elastic and recoverable ionic conductive hydrogel for wireless wearable, stretchable sensor
Authors: Huang Hailong , Han Lu , Li Junfeng , Fu Xiaobin , Wang Yanling , Yang Zhongli , Xu Xingtao , Pan Likun , Xu Min
Published: April 2020

A super-stretchable and self-recoverable ionic conductive hydrogel was designed and used as a wearable stretchable sensor to monitor human body motions.
Recent progress in carbonyl-based organic polymers as promising electrode materials for lithium-ion batteries (LIBs)
Authors: Wang Hao , Yao Chang-Jiang , Nie Hai-Jing , Wang Ke-Zhi , Zhong Yu-Wu , Chen Pengwan , Mei Shilin , Zhang Qichun
Published: April 2020

Lithium-ion batteries (LIBs) have been demonstrated as one of the most promising energy storage devices for applications in electric vehicles, smart grids, large-scale energy storage systems, and portable electronics.
Photoelectron spectroscopy on single crystals of organic semiconductors: experimental electronic band structure for optoelectronic properties
Authors: Nakayama Yasuo , Kera Satoshi , Ueno Nobuo
Published: April 2020

Methodologies and experimental achievements for exploration into electronic band structures of organic semiconductor and hybrid perovskite single crystals are reviewed.
Meso- to nano-scopic domain structures in high Curie-temperature piezoelectric BiScO3–PbTiO3 single crystals of complex perovskite structure
Authors: Luo Zeng , Liu Zenghui , Walker David , Huband Steven , Thomas Pam A. , Zhang Nan , Ren Wei , Ye Zuo-Guang
Published: April 2020

Multi-scale domain structures in the BiScO3–PbTiO3 single crystal are imagined and analyzed by birefringence imaging microscopy (BIM) and piezoresponse force microscopy (PFM), revealing the local distortion in the vicinity of the domain walls.
Evaluating the role of phenethylamine iodide as a novel anti-solvent for enhancing performance of inverted planar perovskite solar cells
Authors: Zervos Christos , Tountas Marinos , Chatzimanolis Konstantinos , Polyzoidis Christos , Kymakis Emmanuel
Published: April 2020

An alternate use of PEAI for enhancing the performance of inverted perovskite solar cells is demonstrated, by employing it as an anti-solvent during the perovskite fabrication process. The results show an enhancement of the open-circuit voltage as compared to the PEAI post treatment.
Green solvent-processed organic solar cells based on a low cost polymer donor and a small molecule acceptor
Authors: Huang He , Li Xiaojun , Sun Chenkai , Angunawela Indunil , Qiu Beibei , Du Jiaqi , Qin Shucheng , Meng Lei , Zhang Zhanjun , Ade Harald , Li Yongfang
Published: April 2020

High-performance OSCs were fabricated based on polymer PTQ10 as donor and HO-IDIC-2F as acceptor, using non-halogen tetrahydrofuran as processing solvent and the PCE of the as-cast OSCs reached 12.20% which is competitive with regular chloroform.
Interface and polarization effects induced Schottky-barrier-free contacts in two-dimensional MXene/GaN heterojunctions
Authors: Wang Jun , Zhou Xiangyu , Yang Mingjun , Cao Dan , Chen Xiaoshuang , Shu Haibo
Published: April 2020

Interface and polarization effects induce the transition from Schottky to Ohmic contacts in two-dimensional MXene/GaN heterojunctions.
Measurement of Brillouin gain spectrum with dual‐frequency laser for optical fibre sensor
Authors: Salhi M. , Kemlin V. , Faci S. , Baili G. , Khadour A. , Mostarshedi S. , Billabert A.‐L.
Published: April 2020

In this Letter, the authors present a first measurement of Brillouin gain spectrum with dual‐frequency solid‐state laser. This allows a coherent detection of the Brillouin backscattered spectrum in a frequency range below the hundreds of MHz by fine‐tuning of the difference between the two cross‐polarised fields emitted by the laser. The photodetection at low‐frequency benefits from the balanced detection technique where high dynamic range measurements are largely available. The narrow line‐width of the cross‐polarised field permits also the direct measurement of the Brillouin spectrum line‐width. The system is demonstrated by measuring the Brillouin frequency shift with temperature when standard single‐mode fibre‐28 (SMF‐28) and large effective area fibre (LEAF) are fully heated. This gives temperature coefficients close to theoretical expectations with values of 1.16 MHz/°C for SMF‐28 and 1.15 MHz/°C for LEAF.
Analysis of air‐gap permeance functions in flux‐modulation double‐stator electrical excitation synchronous machine
Authors: Zhao Chenchen , Wang Yubin , Xu Wei , Li Xianglin , Feng Xingtian
Published: April 2020

The air‐gap magnetic field analysis of the field‐modulation double‐stator electrical excitation synchronous machine (FM‐DSEESM) is complicated due to its double stator and modulation‐ring rotor configuration. Aimed to investigate the influence of the each part of the machine on the magnetic fields in the air‐gaps, this study focuses on the permeance function analysis of FM‐DSEESM to reveal its air‐gap magnetic field distribution. Due to the limited physical space, the non‐ferromagnetic segments of modulation‐ring rotor in FM‐DSEESM cannot be regarded as infinitely deep slots. Therefore, by adding a new flux line in the non‐ferromagnetic segments, a new permeance function is proposed based on the calculation of the equivalent air‐gaps. Then, analytical results of flux densities in the air‐gaps are calculated and verified by finite element analysis. Finally, a FM‐DSEESM prototype is fabricated to prove the feasibility of the permeance functions.
Investigation of a hybrid excited doubly salient machine with permanent magnets located on stator slot openings
Authors: Zheng Mei , Cai Shun , Zhu Zi‐Qiang
Published: April 2020

This study proposes a hybrid excited (HE) doubly salient machine with permanent magnets (PMs) located on stator slot openings. The HE machine inherits the high torque density of PM machines as well as flexible magnetic field regulation of wound field machines. Since the PMs are located at stator slot opening, the PM flux is shunted in the stator without DC excitation, and the machine exhibits high fault‐tolerant capability at high‐speed operation. The proposed machine is optimised, together with a comparison with a conventional stator slot PM HE machine. It is revealed that the proposed HE machine exhibits a significantly higher torque density under the same copper loss and PM usage. Finally, a prototype is fabricated, and experiments have been conducted to verify the accuracy of finite element simulation on the proposed machine topology.
Harmonic indices for continuous evaluation of consumer's harmonic contribution
Authors: Tadayon Mahdi , Hooshmand Rahmat‐Allah , Kiyoumarsi Arash , Esfahani Mehdi Torabian
Published: April 2020

Nowadays, the determination of the contribution of individual customers to the harmonic pollution of an electric power network is very essential for power quality improvement. In this study, four new indices are introduced to investigate the effect of harmonic contribution (HC) of the pollutant customers for an arbitrary time period without any access to a network model. These indices are defined according to data measured at the connection point of the suspicious loads and targeted buses under study. In this regard, a continuous HC matrix is developed where its entries are determined by using a new multi‐point and continuous HC calculation method without having to measure the phase angle, which makes this method practical and cost‐effective. The method and indices are applied to a standard power network‐based calculation example. In addition, experimental measurements, which are gathered based on the Isfahan city and Iran electric power transmission systems, are carefully analysed. The results demonstrated the capability of the proposed algorithm to evaluate the effects of harmonic sources in power networks.
Relationship between performance indexes and offset angles of virtual phasor measurement algorithm based on DFT
Authors: Zhang Lun , Xu Ke‐Jun , Xu Hao‐Ran , Jiang Zhen , Ma Jie , Huang Ya , Liu Chen‐Ci
Published: April 2020

Phasor measurement unit can monitor the variation of phase angle of power grid in real time, which is of great significance to ensure the safe and stable operation of power grid. Among them, the virtual phasor measurement algorithm based on discrete Fourier transform (DFT) has been widely used because of its simple principle and relatively easy implementation. However, the existing virtual phasor measurement algorithm only gives the dynamic error reduction effect under the fixed offset angle, and does not give the rule of the reduction effect with the different offset angle. The relationship between anti‐harmonic interference capability and response speed with the different offset angles is not analysed. Therefore, this study deduces the pattern of dynamic error reduction effect, anti‐harmonic interference ability and response speed with the different offset angles. The dynamic error reduction effect of the algorithm is the best when the offset angle is π/2, and the anti‐harmonic interference ability of the algorithm is the strongest when the offset angle is π/3. The response speed of the algorithm increases linearly with the increase of the offset angle. On this basis, the correctness of the algorithm is verified by numerical simulation experiments.
Islanding detection method based on image classification technique using histogram of oriented gradient features
Authors: Manikonda Santhosh K.G. , Gaonkar Dattatraya N.
Published: April 2020

A new islanding detection method based on image classification with support vector machine is proposed in this study. Histogram of oriented gradient features is extracted from the image for classifying non‐islanding and islanding events. In the proposed technique, the time‐series signal acquired from the point of common coupling is first converted into an image. Histogram of oriented gradient features is extracted from the image, which is used as an input feature vector for training and testing multiple support vector machine classifiers. Parameters such as voltage, rate of change of voltage, and rate of change of negative sequence voltage are used. Furthermore, a feature for early islanding detection is also presented to detect an islanding event even before it has occurred. The detection accuracy of the proposed method is tested with different kernels. The performance of all the classifiers is tested with 5‐fold cross‐validation. The classification results show that islanding detection with image classification based on the histogram of oriented gradient feature and multiple support vector machine classifiers can achieve excellent results.
Analysis of a rectangular waveguide transverse slot using MoM and image method
Authors: Kakatkar Sandeepak S. , Deshmukh Amit A. , Ray Kamla Prasan
Published: April 2020

A waveguide fed transverse slot has been analysed using the Method of Moments (MoM) formulation, wherein the internal admittance matrix elements have been evaluated from image theory and using the images of the slot due to waveguide walls. The contribution from all the images not in the same row as the slot has been evaluated using a closed‐form expression and a rapidly converging series with negligible contribution. The contribution from the row containing the reference slot has been evaluated by adding the mutual admittance between a few images and the reference slot using some recently developed simple and accurate approximations. The formulation has been extended to transverse slots radiating between the baffles. The results calculated using this simple, efficient and intuitive method are in excellent agreement with other theoretical as well as measured results. The technique can be extended to other slot configurations such as an inclined slot and for other slot aperture distributions such as with an edge condition in configurations permitting image formation.
Influence of xylene on the dielectric response of an organoclay‐containing nanocomposite
Authors: Shaw Allison V. , Vaughan Alun S. , Andritsch Thomas
Published: April 2020

The dielectric effect, investigated using dielectric spectroscopy and DC dielectric breakdown strength measurements, of introducing xylene into a composite system containing polyethylene, a co‐polymer of ethylene and vinyl acetate and an organoclay can be understood in light of X‐ray diffraction data. In dielectric spectroscopy, although organoclay alone changes the dielectric response of the polymer blend and xylene has no effect on the unfilled polymer blend, when both xylene and organoclay are present, a synergistic response is revealed at the 1 Vrms amplitude voltage used to acquire the dielectric data. In contrast to this, in DC, dielectric breakdown strength measurements revealed that, under high field conditions, both the xylene and organoclay, independently, caused a decreased breakdown strength. This work was undertaken in order to examine the generality of the possible effects of labile, low molar mass impurities on electrical properties of comparable systems, which may be processed through solvent‐based routes.
Quantitative assessment of water content and mineral abundances at Gale crater on Mars with orbital observations
Authors: Liu Yang , Stachurski Federico , Liu Zhenghao , Zou Yongliao
Published: April 2020

Context. The information of water content can help to improve atmospheric and climate models, and thus provide a better understanding of the past and present role of water and aqueous alteration on Mars. Mineral abundances can provide unique constraints on their formation environments and thus also on the geological and climate evolution of Mars.

Aims. In this study, we used a state-of-the-art approach to derive the hydration state and mineral abundances over Gale crater on Mars, analysing hyperspectral visible/near-infrared data from the Observatoire pour la Minéralogie, l’Eau, les Glaces et l’Activité (OMEGA) instrument onboard Mars Express and from the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) instrument onboard the Mars Reconnaissance Orbiter.

Methods. The Discrete Ordinate Transfer model was used to perform atmospheric and thermal correction of the OMEGA and CRISM hyperspectral data in order to derive the surface single scattering albedos (SSAs) at Gale crater, Mars. Water content was estimated using a linear relationship between the derived effective single-particle absorption thickness at 2.9 μm from SSAs and the water weight percentage. Mineral abundances were retrieved by performing the linear spectral unmixing of SSAs from CRISM data. The results were compared with the ground-truth results returned from Curiosity rover.

Results. The water content for most areas at Gale crater derived using the OMEGA data is around 2–3 water weight percent (water wt % hereafter), which is in agreement with that derived from the in situ measurements by Curiosity’s Sample Analysis at Mars instrument. However, the sensitivity tests show that uncertainties exist due to the combination of several factors including modelling bias, instrumental issue, and different sensing techniques. The derived mineral abundances using the orbital data are not fully consistent with that derived by Curiosity, and the discrepancy may be due to a combination of dust cover, texture, and particle size effects, as well as the effectiveness of the quantitative model.

Conclusions. The ground-truth data from Curiosity provide a critical calibration point for the quantitative method used in the orbital remote-sensing observations. Our analysis indicates that the method presented here has great potential for mapping the water content and mineral abundances on Mars, but caution must be taken when using these abundance results for geological interpretations.
The flux distribution of Sgr A*
Authors:   GRAVITY Collaboration, Abuter R. , Amorim A. , Bauböck M. , Berger J. B. , Bonnet H. , Brandner W. , Cardoso V. , Clénet Y. , de Zeeuw P. T. , Dallilar Y. , Dexter J. , Eckart A. , Eisenhauer F. , Förster Schreiber N. M. , Garcia P. , Gao F. , Gendron E. , Genzel R. , Gillessen S. , Habibi M. , Haubois X. , Henning T. , Hippler S. , Horrobin M. , Jiménez-Rosales A. , Jochum L. , Jocou L. , Kaufer A. , Kervella P. , Lacour S. , Lapeyrère V. , Le Bouquin J.-B. , Léna P. , Nowak M. , Ott T. , Paumard T. , Perraut K. , Perrin G. , Pfuhl O. , Ponti G. , Rodriguez Coira G. , Shangguan J. , Scheithauer S. , Stadler J. , Straub O. , Straubmeier C. , Sturm E. , Tacconi L. J. , Vincent F. , von Fellenberg S. D. , Waisberg I. , Widmann F. , Wieprecht E. , Wiezorrek E. , Woillez J. , Yazici S. , Zins G.
Published: April 2020

The Galactic center black hole Sagittarius A* is a variable near-infrared (NIR) source that exhibits bright flux excursions called flares. When flux from Sgr A* is detected, the light curve has been shown to exhibit red noise characteristics and the distribution of flux densities is non-linear, non-Gaussian, and skewed to higher flux densities. However, the low-flux density turnover of the flux distribution is below the sensitivity of current single-aperture telescopes. For this reason, the median NIR flux has only been inferred indirectly from model fitting, but it has not been directly measured. In order to explore the lowest flux ranges, to measure the median flux density, and to test if the previously proposed flux distributions fit the data, we use the unprecedented resolution of the GRAVITY instrument at the VLTI. We obtain light curves using interferometric model fitting and coherent flux measurements. Our light curves are unconfused, overcoming the confusion limit of previous photometric studies. We analyze the light curves using standard statistical methods and obtain the flux distribution. We find that the flux distribution of Sgr A* turns over at a median flux density of (1.1 ± 0.3) mJy. We measure the percentiles of the flux distribution and use them to constrain the NIR K-band spectral energy distribution. Furthermore, we find that the flux distribution is intrinsically right-skewed to higher flux density in log space. Flux densities below 0.1 mJy are hardly ever observed. In consequence, a single powerlaw or lognormal distribution does not suffice to describe the observed flux distribution in its entirety. However, if one takes into account a power law component at high flux densities, a lognormal distribution can describe the lower end of the observed flux distribution. We confirm the rms–flux relation for Sgr A* and find it to be linear for all flux densities in our observation. We conclude that Sgr A* has two states: the bulk of the emission is generated in a lognormal process with a well-defined median flux density and this quiescent emission is supplemented by sporadic flares that create the observed power law extension of the flux distribution.
Mapping the working of environmental effects in A963
Authors: Deshev Boris , Haines Christopher , Hwang Ho Seong , Finoguenov Alexis , Taylor Rhys , Orlitova Ivana , Einasto Maret , Ziegler Bodo
Published: April 2020

Aims. We qualitatively assess and map the relative contribution of pre-processing and cluster related processes to the build-up of A963, a massive cluster at z = 0.2 showing an unusually high fraction of star forming galaxies in its interior.

Methods. We use Voronoi binning of positions of cluster members on the plane of the sky in order to map the 2D variations of galaxy properties in the centre and infall region of A963. We map four galaxy parameters (fraction of star forming galaxies, specific star formation rate, H I deficiency and age of the stellar population) based on full SED fitting, 21 cm imaging and optical spectroscopy.

Results. We find an extended region dominated by passive galaxies along a north–south axis crossing the cluster centre, possibly associated with known filaments of the large-scale structure. There are signs that the passive galaxies in this region were quenched long before their arrival in the vicinity of the cluster. Contrary to that, to the east and west of the cluster centre lie regions of recent accretion dominated by gas rich, actively star forming galaxies not associated with any substructure or filament. The few passive galaxies in this region appear to be recently quenched, and some gas rich galaxies show signs of ongoing ram-pressure stripping. We report the first tentative observations at 21 cm of ongoing ram-pressure stripping at z = 0.2, as well as observed inflow of low-entropy gas into the cluster along filaments of the large-scale structure.

Conclusions. The observed galaxy content of A963 is a result of strongly anisotropic accretion of galaxies with different properties. Gas rich, star forming galaxies are being accreted from the east and west of the cluster and these galaxies are being quenched at r <  R200, likely by ram-pressure stripping. The bulk of the accretion onto the cluster, containing multiple groups, happens along the north–south axis and brings mostly passive galaxies, likely quenched before entering A963.
L’adaptation aux évolutions récentes des vins vue par des vignerons d’AOP. Enquête en Anjou et Alsace (France)
Authors: Teil Geneviève
Published: April 2020

La viticulture en appellation d’origine protégée (AOP) est considérée d’autant plus sensible au changement climatique qu’elle s’impose des contraintes réglementaires de localisation, d’approvisionnement, de pratiques et de qualité des vins. Ces obligations vouent-elles les AOP à une disparition rapide faute de pouvoir s’adapter aux changements à venir ? Bien que l’anticipation de long terme du changement climatique ne soit pas vraiment à l’ordre du jour, les vignerons adaptent tous en continu leurs pratiques aux variations des conditions atmosphériques. Une enquête par entretiens auprès de vignerons angevins et alsaciens montre néanmoins qu’ils divergent dans la conception et la mise en œuvre de cette adaptation, notamment au moment de distinguer ce qui fait l’identité d’AOP à maintenir et les ressources acceptables pour y parvenir. De plus, cette enquête pointe l’émergence d’une façon originale de penser l’adaptation qui délègue à la vigne la charge de la bonne adaptation, défiant ainsi les plus sombres pronostics. Pour y parvenir, les producteurs expérimentent et renouvellent leurs pratiques vitivinicoles afin de rendre leurs vignes « résistantes » au changement et qu’elles continuent d’exprimer leur terroir et de manifester les qualités de leurs AOP.
Justification of the method of determination of the border overburden ratio
Authors: Joukov Serhii , Lutsenko Serhii , Hryhoriev Yulian , Martyniuk Maxim , Peregudov Volodymyr
Published: April 2020

The economic efficiency of the enterprise and the length of its operation, the full utilization of mineral reserves and the total cost of operation depend on the selected depth and boundaries of opencast mining. In such conditions of the deposits’ development it is necessary to evaluate the capabilities of the raw material base for the further development of the mining enterprise. The basis for determining of the border overburden ratio is on the condition that the price of manufactured marketable output of the designed enterprise should not exceed the price of the same marketable output in the world market. The realization of this condition is achieved analytically. This takes into account the impact of the rate of return on the final depth of the designed open pit. A new method of determining of the border overburden ratio is developed, which ensures the competitiveness of iron ore concentrate in the world market. The value of the border overburden ratio is developed for the Pershotravnevij open pit of the Northern mining and processing plant, depending on the situation of the iron-containing products’ prices, which ensures the competitiveness of marketable iron-ore output in the domestic and world markets.
Development of resource-saving technology when mining ore bodies by blocks under rock pressure
Authors: Pysmenniy Serhii , Shvager Natalya , Shepel Oleksandr , Kovbyk Kostiantyn , Dolgikh Oleksandr
Published: April 2020

The article aims to develop the resource-saving technology when mining steep ore bodies applying 250 mm-diameter boreholes to break ore into the compressed environment. This will reduce dilution of the mined ore mass in conditions of rock pressure around blocks. When mining iron ore deposits of Kryvyi Rih basin, applied mining systems allow for creation of the compensatory space as the first stage. However, these stopes fail under rock pressure, this influencing negatively ore breaking and extraction. The degree of extraction can be increased through breaking ore mass into the compressed environment. The width of the ore layer to be broken onto the compressed environment is determined through industrial investigations. To enhance breaking conditions, it is suggested to apply boreholes of a larger diameter. However, there is no technique developed for determining thickness of the ore layer to be broken depending on the borehole diameter and the fragmentation factor. When applying 250 mm boreholes, increase of thickness of the layer to be broken from 2 to 10 m is found to cause compaction of the previously broken layer up to 3 m with the optimal ore fragmentation factor of 1.3–1.5 and 3-fold decrease of lumps yield. This results from the fact that drilling a 250 mm borehole to secure even provision of the massif with explosives reduces the line of the least resistance.
Identification of the process of hydromechanical extraction of amber
Authors: Malanchuk Zinovii , Korniyenko Valerii , Malanchuk Yevhenii , Khrystyuk Andriy , Kozyar Mykola
Published: April 2020

The article deals with the method of hydromechanical extraction of amber from sand deposits. The essence of hydromechanical method of amber extraction is considered. The process of extraction has been identified. The analytical expressions obtained for calculating the parameters of hydromechanical extraction of amber from sand deposits, and in particular the expression for determining the rate of emergence of an amber particle, can be used in the further engineering calculations of process parameters and process equipment. These expressions will allow to accurately substitute and with sufficient accuracy to calculate the parameters of the process of extracting amber from amber-containing deposits, as well as to set the parameters of technological equipment for the implementation of this process.
Ways of increase of efficiency of drilling-and-blasting
Authors: Rymarchuk Borys , Shepel Oleksandr
Published: April 2020

Results of theoretical researches and industrial experiments on technology of breaking of a massif with use of the artificial screens formed by lumbago of blasthole charges are resulted. In research the technology of breaking of ore by means of the vertical concentrated charges (VCC) on in advance formed screens is offered at underground mining. Possible ways of improvement of technology of working of deposits which will provide reduction of a production cost of ore are considered. The effective variant of a location of chisel developments, charges of the vertical concentrated charges (VCC) and artificial screens in the block is considered. It is analyzed the basic variants of formation of a shielding layer at breaking of ore by fans of deep boreholes and a location of boreholes in the coupled fan. The effective sequence of breaking of ore and necessary parameters of drilling-and-blasting is offered at underground mining. Comparison of results of measurements of granules of metric structure of the crushed mass on experimental sites of an ore mine is considered, analyzed and spent. The method of increase of efficiency of passage of the reflected and broken waves through the screen is offered at ore breaking. The considerable effect from explosion of charges in the presence of zones of unloading is resulted with is artificial they formed screens at massif destruction by the vertical concentrated charges.
Machine learning: technologies and potential application at mining companies
Authors: Zelinska Snizhana
Published: April 2020

Implementation of machine learning systems is currently one of the most sought-after spheres of human activities at the interface of information technologies, mathematical analysis and statistics. Machine learning technologies are penetrating into our life through applied software created with the help of artificial intelligence algorithms. It is obvious that machine learning technologies will be developing fast and becoming part of the human information space both in our everyday life and in professional activities. However, building of machine learning systems requires great labour contribution of specialists in the sphere of artificial intelligence and the subject area where this technology is to be applied. The article considers technologies and potential application of machine learning at mining companies. The article describes basic methods of machine learning: unsupervised learning, action learning, semi-supervised machine learning. The criteria are singled out to assess machine learning: operation speed; assessment time; implemented model accuracy; ease of integration; flexible deployment within the subject area; ease of practical application; result visualization. The article describes practical application of machine learning technologies and considers the dispatch system at a mining enterprise (as exemplified by the dispatch system of the mining and transportation complex “Quarry” used to increase efficiency of operating management of enterprise performance; to increase reliability and agility of mining and transportation complex performance records and monitoring. There is also a list of equipment performance data that can be stored in the database and used as a basis for processing by machine learning algorithms and obtaining new knowledge. Application of machine learning technologies in the mining industry is a promising and necessary condition for increasing mining efficiency and ensuring environmental security. Selection of the optimal process flow sheet of mining operations, selection of the optimal complex of stripping and mining equipment, optimal planning of mining operations and mining equipment performance control are some of the tasks where machine learning technologies can be used. However, despite prospectivity of machine learning technologies, this trend still remains understudied and requires further research.
Information and measurement system for determining the acceleration of gravity based on a ballistic gravimeter with a twodimensional video system
Authors: Humeniuk Anna , Bezvesilna Olena , Bogdanovskyi Martin , Yanchuk Valentyn
Published: April 2020

The aim of the sustainable development strategy is to introduce European standards of living in Ukraine and Ukraine’s leading position in the world. Active development is observed in information and measurement systems. The article provides a refined mathematical model of the new ballistic laser gravimeter. The composition and structure of the main errors of the ballistic laser gravimeter are given. The main errors of the ballistic laser gravimeter are calculated and estimated. The computer behavior of ballistic laser gravimeter behavior for the most unfavorable resonance modes for different ratios of disturbance values and proper ballistic laser gravimeter parameters is performed. It is suggested to use digital video as a medium of measurement information in the new ballistic laser gravimeter.
Analysis and synthesis of factors determining the sintering speed of sinter charge
Authors: Saveliev Serhii , Kondratenko Mariia
Published: April 2020

The main objectives of the study are the analysis and generalization of the parameters that determine the intensity of the sintering, the development of a model of motion of the combustion zone of the sinter charge. As a result of the analysis of the known indicators of the intensity of the sintering process, it was shown that the most representative characteristic of the intensity of the process is the vertical sintering speed, which is an integral part of the complex intensity indicator − the specific productivity of the sintering machine. Many various models of the sintering process have been developed. The author develops a new mathematical model of the motion of the solid fuel combustion zone during sintering of the sinter charge (vertical sintering speed). The model is presented in the form of an expanding network of separate interrelated dependencies (equations), selected as independent submodels. The results of the study using the developed model of the dependence of the vertical sintering speed on the solid fuel content and on the flux content in the charge, are presented. It is concluded that the presented model can be considered as an element of a universal model software complex of the sintering process.
The sustainable future of open-pit trucks operation
Authors: Monastyrskiy Yurii , Sistuk Volodymyr , Potapenko Volodymyr , Maksymenko Ivan
Published: April 2020

Open-pit truck technical operation determines mined bulk transportation effectiveness increasing equipment’s commercial operation duration based on a robust strategy of vehicle’s maintenance, early and high-quality diagnostics, upkeep and recovery. Developed mathematical model of BelAZ open-pit truck operation for various levels of organization of servicing replicates a Markov process in the system of technological automotive transport considering possibilities of vehicle states with time and steady-state condition. The performance of open-pit trucks was consistently evaluated and the model of the technological automotive transport system was synthesized. The validation analysis of the obtained model showed its suitability for optimization of open-pit truck performance. The calculated optimal controlling actions on the open-pit truck allow developing an algorithm and technique for dynamic adjustment of parameters of maintenance, diagnostics and repair of BELAZ open-pit trucks that will become the basis for a sustainable future of industrial transport technical operation.
Sustainable futures in the context of architectural design of hospitals
Authors: Bulakh Irina , Didichenko Margaryta , Kozakova Olena , Chala Olena
Published: April 2020

The problems of necessity of sustainable and ecological approaches in architectural design of hospitals are raised in the research. The best international experience of designing and operating hospitals designed on the principles of sustainable development is considered. Examples and implementation examples of healthcare institutions integrating energy efficient technologies are analyzed and illustrated: natural ventilation, solar panels, rainwater collection, filtration and reuse of wastewater, greening of the roof and walls, sun protection, aerodynamic volumetric and spatial form. Studying and using the proven experience of the best examples of ecological hospital buildings, recognized and certified at the highest levels of the world institutions for the development of a sustainable future, will allow Ukraine to create the conditions for solving the crisis both in the sphere of health care and in the ecologically preserved environment of the country.
Methodical requirements for training materials of on-line courses on the platform “Higher school mathematics teacher”
Authors: Vlasenko Kateryna , Chumak Olena , Lovianova Iryna , Kovalenko Daria , Volkova Nataliia
Published: April 2020

The article looks into the issue of developing methodical requirements for the structure and content of online courses. The study is dedicated to the analysis of peculiarities of developing the content of online systems and developing methodical recommendations to educational materials for online courses of training higher school mathematics teachers. The research considers the experts’ experience in preparing, structuring and developing the content for online courses and answers to volunteers who have agreed to test the educational materials of the course. The answers given by the participants have allowed estimating the quality of the developed course and detecting its insignificant drawbacks. The article discusses general requirements to the structure and content of the online course, means for the implementation of a testing subsystem, peculiarities of developing educational video content and educational materials in PDF format, issues of implementing forum and survey subsystems, as well as means of estimating learning outcomes. We have grounds to conclude that the quality of the course is determined by the range of factors, among which we point out the course organization based on weekly planning, implementation of a testing subsystem under conditions of extended functionality, creation of abilities to organize feedback.
Cloud-oriented environment for flipped learning of the future IT specialists
Authors: Glazunova Olena , Voloshyna Tetiana , Korolchuk Valentyna , Parhomenko Oleksandra
Published: April 2020

The article deals with the creation and use of the cloud-oriented environment for flipped learning in the process of training future IT specialists in higher education institutions. It describes the organization of the students’ project work based on flipped learning using the services and resources of the cloud-oriented educational environment. It identified the following components of such an environment: resources of the university’s training portal, mass open online courses, profession-oriented software applications and project management services. The present research offers the model of flipped learning for the implementation of the cross-disciplinary project for the formation of professional and personal competences of future IT specialists. It provides the results of an experimental study of the effectiveness of the proposed cloud-oriented environment application in the implementation of the cross-disciplinary project from the perspective of students and teachers by three criteria: functionality for professional activity, project management and flipped learning.
Personalization of learning through adaptive technologies in the context of sustainable development of teachers’ education
Authors: Marienko Maiia , Nosenko Yulia , Sukhikh Alisa , Tataurov Viktor , Shyshkina Mariya
Published: April 2020

The article highlights the issues of personalized learning as the global trend of the modern ICTbased educational systems development. The notion, the main stages of evolution, the main features and principles of adaptive learning systems application for teachers’ training are outlined. It is emphasized that the use and elaboration of the adaptive cloud-based learning systems are essential to provide sustainable development of teachers’ education. The current trends and peculiarities of the cloud-based adaptive learning systems development and approach of their implementation for teachers’ training are considered. The general model of the adaptive cloud-based learning system structure is proposed. The main components of the model are described; the issues of tools and services selection are outlined. The methods of the cloudbased learning components introduction within the adaptive systems of teacher training are considered. The current research developments of modeling and implementation of the adaptive cloud-based systems are outlined.
Improvement of the student evaluation system based on the ICT use
Authors: Pshenychna Olena , Klopov Roman , Gura Oleksandr , Gura Tetiana
Published: April 2020

Today, considerable attention is paid to the higher education quality issues. The problem is solved by using tests that should provide a reliable student evaluation. The article presents the technology for improving test tasks. It includes functional procedures that specify the test and test task improvement sequence. It is found that it is better to use specialized computer applications for their implementation, that is why this technology involves the use of the author program “Statistical Analysis of Test Results”. This program calculates the indicators – the item difficulty, discrimination, reliability and validity – according to empirical student testing data. The indicators help identify unsatisfactory quality test tasks and improve the student assessment means, as the program derives the recommendations. The steps set out by the testing result processing technology with the help of a statistical package increase the improvement process efficiency. The correlation and factor analyses help identify the tasks that put the highest load into the test score. These procedures influence on making a decision on the test task review need. The technology involves repeated checking procedures. The presented technology has been tested at Zaporizhzhya National University and Zaporizhzhya Regional Institute of Postgraduate Teacher Education. ANOVA has helped prove its effectiveness.
Intelligent specialization as a promising strategy for the sustainable development of industrial regions of Ukraine (the case of Kryvyi Rih industrial region)
Authors: Lobanova Alla , Bayura Vadym , Viznytsia Yriy , Bratchenko Liudmila , Karitka Valeriy
Published: April 2020

The paper discusses the basic principles of sustainable development as the dominant strategy for economic development, showcasing the features of its introduction in the major industrial regions of Ukraine. Substantiates the belief that the impact greening production useful in industrial regions, particularly in Kryvyi Rih, introduce European, including Polish experience intelligent (reasonable) specialization that takes into account the specificity of resources of the region and is based on the introduction of the latest smart technologies.