bluuebunny/crossref_metadata_2025 huggingface dataset:
Fluorine plasma treatment on carbon-based perovskite solar cells for rapid moisture protection layer formation and performance enhancement
Authors: Kim Jungwon , Lee Gyeongseop , Lee Kisu , Yu Haejun , Lee Jong Woo , Yoon Chang-Min , Kim Sung Gun , Kim Seong Keun , Jang Jyongsik
Published: December 2019

We first manufactured an F plasma-treated carbon electrode-based high performance perovskite solar cell with strong moisture resistance.
Crystallization and biocompatibility enhancement of 3D-printed poly(l-lactide) vascular stents with long chain branching structures
Authors: Jiafeng Li , Qin Zhang , Tiantang Fan , Li Gong , Wuyou Ye , Zhongyong Fan , Lu Cao , Qing Liu
Published: December 2019

The long chain branching poly(L-lactide)s were prepared by reactive processing of linear PLA using pyromellitic dianhydride and polyfunctional epoxy ether as the branching agent and their vascular stents were fabricatedvia3D-printing.
Equilibrium structures of water molecules confined within a multiply connected carbon nanotube: a molecular dynamics study
Authors: Kim Taehoon , Kim Gwan Woo , Jeong Hyunah , Kim Gunn , Jang Soonmin
Published: December 2019

Molecular dynamics simulations of water molecules inside the multiply connected carbon nanotube.
Redox-mediated transformation of a Tb2O3(111) thin film from the cubic fluorite to bixbyite structure
Authors: Lee Christopher J. , Sayal Ameen , Vashishtha Saumye , Weaver Jason F.
Published: December 2019

Repeated oxidation and reduction transforms a cubic fluorite Tb2O3(111) film to the bixbyite structure.
Topology of quantum coherence networks in singlet fission: mapping exciton states into real space and the dislocation induced three dimensional manifolds
Authors: Tao Guohua
Published: December 2019

The mapping of exciton states into crystal lattices results in a straightforward description of the quantum coherence network, which may facilitate quantum control and quantum materials design.
Electron-induced vibrational excitation and dissociative electron attachment in methyl formate
Authors: Kumar T. P. Ragesh , Kočišek J. , Bravaya K. , Fedor J.
Published: December 2019

We probe the low-energy electron collisions with methyl formate HCOOCH3, focusing on its resonant states.
The shift in urea orientation at protein surfaces at low pH is compatible with a direct mechanism of protein denaturation
Authors: de Oliveira Ivan Pires , Martínez Leandro
Published: December 2019

The protonation of acidic side-chains promotes a orientational shift of urea molecules, but only locally, with the interactions with other protein moieties being preserved.
Dependence of deposition method on the molecular structure and stability of organosilanes revealed from degrafting by tetrabutylammonium fluoride
Authors: Miles Jason , Ko Yeongun , Genzer Jan
Published: December 2019

We probe the structure of self-assembled monolayers comprising organosilanes on flat silica-based surfaces prepared by liquid and vapor deposition by removing the organosilane molecules gradually from the substrate via tetrabutylammonium fluoride.
Thermal conductance bottleneck of a three dimensional graphene–CNT hybrid structure: a molecular dynamics simulation
Authors: Yu Zepei , Feng Yanhui , Feng Daili , Zhang Xinxin
Published: December 2019

We observed the atomistic structure of the junction to study mechanism governing the thermal transport across GCNT.
Structural characterization of Janus nanoparticles with tunable geometric and chemical asymmetries by small-angle scattering
Authors: Anitas Eugen Mircea
Published: December 2019

The structure of Janus nanoparticles with tunable geometric and chemical asymmetries is determined by small-angle scattering.
Quantum tunnelling pathways of the water pentamer
Authors: Cvitaš Marko T. , Richardson Jeremy O.
Published: December 2019

Five tunnelling rearrangement pathways in water pentamer are responsible for the ground-state tunnelling splitting pattern of 320 states.
Three metallic BN polymorphs: 1D multi-threaded conduction in a 3D network
Authors: Xiong Mei , Gao Zhibin , Luo Kun , Ling FeiFei , Gao YuFei , Chen Chong , Yu Dongli , Zhao Zhisheng , Wei Shizhong
Published: December 2019

In this paper, three novel metallic sp2/sp3-hybridized boron nitride (BN) polymorphs are proposed by first-principles calculations.
Electrochemical and photoelectrochemical water splitting with a CoOx catalyst prepared by flame assisted deposition
Authors: Li Fusheng , Zhao Ziqi , Yang Hao , Zhou Dinghua , Zhao Yilong , Li Yingzheng , Li Wenlong , Wu Xiujuan , Zhang Peili , Sun Licheng
Published: December 2019

A cobalt oxide catalyst prepared by a flame-assisted deposition method on the surface of FTO and hematite for electrochemical and photoelectrochemical water oxidation, respectively.
Precious metal nanocrystals for renewable energy electrocatalysis: structural design and controlled synthesis
Authors: Luo Mingchuan , Yang Yong , Guo Shaojun
Published: December 2019

Electrocatalysis plays a crucial role in the transformation between electrical and chemical energy.
Half-sandwich ruthenium(ii) complexes with tethered arene-phosphinite ligands: synthesis, structure and application in catalytic cross dehydrogenative coupling reactions of silanes and alcohols
Authors: González-Fernández Rebeca , Crochet Pascale , Cadierno Victorio
Published: December 2019

The preparation of a series of tethered arene-phosphinite ruthenium(ii) complexes, which proved to be highly efficient catalysts for the dehydrogenative coupling of hydrosilanes with alcohols, is presented.
Potential emerging chemical risks in the food chain associated with substances registered under REACH
Authors: Oltmanns J. , Licht O. , Bohlen M.-L. , Schwarz M. , Escher S. E. , Silano V. , MacLeod M. , Noteborn H. P. J. M. , Kass G. E. N. , Merten C.
Published: December 2019

A screening procedure for the identification of potential emerging chemical risks in the food and feed chain developed in a previous EFSA-sponsored study was applied to 15021 substances registered under the REACH regulation at the time of evaluation.
Effect of antibiotic-free, low-protein diets with specific amino acid compositions on growth and intestinal flora in weaned pigs
Authors: Zhou Junyan , Wang Yuming , Zeng Xiangzhou , Zhang Tao , Li Peili , Yao Bingqian , Wang Lu , Qiao Shiyan , Zeng Xiangfang
Published: December 2019

This study investigated the effects of modulation of the amino acid profile on growth performance and gut health in weaned pigs fed an antibiotic-free, low-protein diet.
A versatile biomaterial ink platform for the melt electrowriting of chemically-crosslinked hydrogels
Authors: Nahm Daniel , Weigl Franziska , Schaefer Natascha , Sancho Ana , Frank Andreas , Groll Jürgen , Villmann Carmen , Schmidt Hans-Werner , Dalton Paul D. , Luxenhofer Robert
Published: December 2019

Click-crosslinked microperiodic hydrogels scaffolds from polymer melts: soft but surprisingly robust.
Compositional variation dependent colour tuning and observation of Förster resonant energy transfer in Cd(1−x)ZnxS nanomaterials
Authors: Kumari Lakshmi , Kar Asit Kumar
Published: December 2019

Energy level diagram of FRET process in Cd(1−x)ZnxS nanomaterials between donor (ZnS) and acceptor (CdS): the smaller ZnS materials transfer energy nonradiatively to the larger CdS materials when there is sufficient spectral overlap between them.
Efficient separation of crude oil-in-water emulsion based on a robust underwater superoleophobic titanium dioxide-coated mesh
Authors: Liu Weimin , Cui Mengke , Shen Yongqian , Mu Peng , Yang Yaoxia , Li Jian
Published: December 2019

Robust underwater superoleophobic TiO2-coated meshes were used for the separation of crude oil-in-water emulsion and photocatalytic degradation.
Visible light-induced aerobic oxidative cross-coupling reaction: preparation of α-indolyl glycine derivatives
Authors: Ni Cheng , Chen Wei , Jiang Chunhui , Lu Hongfei
Published: December 2019

Rose Bengal, an organic dye, has been used as a photocatalyst in the cross-coupling reaction between glycine derivatives and indoles.
Fe3O4 nanoparticles functionalized with poly(ethylene glycol) for the selective separation and enrichment of Au(iii)
Authors: Yang Xu , Yang Kunhao , Wu Li , Yang Jingkui , He Yujian
Published: December 2019

Mechanism of Fe3O4@CPTES@PEG magnetic nanoparticles for selectively adsorbing Au(iii) from aqueous solution at pH = 1.0.
MnO2 nanoparticle mediated colorimetric turn-off determination of ascorbic acid
Authors: Wang Qi , Ma Xulu , Lv Houhua , Wei Awen , Wu Tingxuan , Ding Lifeng , Ma Xiang , Ma Chunlei
Published: December 2019

The scheme of the turn-off colorimetric response of AA to the TMB–MnO2 NP system.
Sensitive field-effect transistor sensors with atomically thin black phosphorus nanosheets
Authors: Maity Arnab , Sui Xiaoyu , Pu Haihui , Bottum Kai J. , Jin Bing , Chang Jingbo , Zhou Guihua , Lu Ganhua , Chen Junhong
Published: December 2019

Atomically thin black phosphorus (BP) field-effect transistors have excellent potential for sensing applications.
Recent progress of magnetic nanomaterials from cobalt-containing organometallic polymer precursors
Authors: Ruan Zhijun , Li Zhen
Published: December 2019

This review summarizes the recent progress in the syntheses and materials applications of Co-containing organometallic polymers, and mainly focuses on the preparation of magnetic nanostructures from Co-containing organometallic polymer precursors.
Multifunctional adenine-functionalized supramolecular micelles for highly selective and effective cancer chemotherapy
Authors: Bintang Ilhami Fasih , Huang Shan-You , Chen Jem-Kun , Kao Chen-Yu , Cheng Chih-Chia
Published: December 2019

Adenine-functionalized supramolecular micelles are rapidly endocytosed by cancer cells and enable selective induction of tumor cell death, without harming normal cells.
The effect of the electronic structure and flexibility of the counteranions on magnetization relaxation in [Dy(L)2(H2O)5]3+(L = phosphine oxide derivative) pentagonal bipyramidal SIMs
Authors: Díaz-Ortega Ismael F. , Herrera Juan Manuel , Dey Sourav , Nojiri Hiroyuki , Rajaraman Gopalan , Colacio Enrique
Published: December 2019

The effects of the electronic structure and flexibility of triflate anions in a new high-UeffTBPY-7 SMM, [Dy(OPCy3)2(H2O)5](CF3SO3)3·2OPCy3, have been analyzed.
Surface-grafting polymers: from chemistry to organic electronics
Authors: Wang Shuguang , Wang Zhongwu , Li Jie , Li Liqiang , Hu Wenping
Published: December 2019

This review comprehensively summarizes the recent progress in surface-grafting polymers, including their formation process and the utilization of surface-grafting polymers as functional materials of insulators, conductors and semiconductors in versatile organic electronic devices.
A small amount of delaminated Ti3C2 flakes to greatly enhance the thermal conductivity of boron nitride papers by assembling a well-designed interface
Authors: Huang Xianwu , Wu Peiyi
Published: December 2019

A small amount of MXene to boost the thermal conductivity of boron nitride papers due to the well-designed interface.
Direct synthesis of bifunctional nanorods from a Co–adenine–MoO3 hybrid for overall water splitting
Authors: Jiang Anning , Zhang Wei , Wang Zegao , Nidamanuri Naga Pradeep , Li Qiang , Zeng Xiao Cheng , Dong Mingdong
Published: December 2019

Well-defined core–shell Co-Mo2C@NGCS nanorods are designed and synthesized through one-step pyrolysis of a Co–adenine–MoO3 hybrid and are used as highly efficient bifunctional electrocatalysts for overall water splitting.
Allylation of β-amino phosphonic acid precursor via palladium-NHC catalyzed allylic C–H activation
Authors: Ren Wei , Jin Ming , Zuo Qian-Ming , Yang Shang-Dong
Published: December 2019

A Pd(ii)/N-heterocyclic carbene (NHC) catalyzed allylic C–H alkylation of allylbenzene with α-cyano-phosphate ester has been achieved under mild reaction conditions with the highest regioselectivity and stereoselectivity.
Trifluoroacetimidoyl halides: a potent synthetic origin
Authors: Chen Zhengkai , Hu Sipei , Wu Xiao-Feng
Published: December 2019

In the review, recent advances in the synthetic applications of trifluoroacetimidoyl halides have been summarized.
Cyclamenols E and F, two diastereoisomeric bicyclic macrolactams with a cyclopentane moiety from an Antarctic Streptomyces species
Authors: Shen Jingjing , Wang Jie , Chen Hao , Wang Yi , Zhu Weiming , Fu Peng
Published: December 2019

A new bicyclic macrolactam with selective inhibition against N87 cells, together with its diastereoisomer, was isolated from an Antarctic Streptomyces species.
An asymmetric multicatalytic reaction sequence of 2-hydroxycinnamaldehydes and enolic 1,3-dicarbonyl compounds to construct bridged bicyclic acetals
Authors: Zhang Xiao-Qian , Lv Xue-Jiao , Pei Jun-Ping , Tan Rui , Liu Yan-Kai
Published: December 2019

2-Hydroxycinnamaldehydes and cyclic 1,3-dicarbonyl nucleophiles were used in an asymmetric organocatalyzed reaction sequence to construct bridged bicyclic acetals via a multicatalytic process involving iminium catalysis and anion-binding catalysis.
Iron-catalyzed three-component intermolecular trifluoromethyl-acyloxylation of styrenes with NaSO2CF3 and benzoic acids
Authors: Xu Rui , Cai Chun
Published: December 2019

A new iron-catalyzed intermolecular three-component trifluoromethyl-acyloxylation of styrenes has been developed with a broad substrate scope under mild conditions.
Design of high-temperature f-block molecular nanomagnets through the control of vibration-induced spin relaxation
Authors: Escalera-Moreno Luis , Baldoví José J. , Gaita-Ariño Alejandro , Coronado Eugenio
Published: December 2019

An efficient general first-principles methodology to simulate vibration-induced spin relaxation in f-block molecular nanomagnets that drastically reduces the computation time.
Brønsted acid catalysis of photosensitized cycloadditions
Authors: Sherbrook Evan M. , Jung Hoimin , Cho Dasol , Baik My-Hyun , Yoon Tehshik P.
Published: December 2019

Brønsted acids can catalyze triplet energy transfer reactions, and DFT computations suggest the unexpected importance of reorganization energy for catalysis.
Interfacial analysis of a PEM electrolyzer using X-ray computed tomography
Authors: Leonard Emily , Shum Andrew D. , Danilovic Nemanja , Capuano Christopher , Ayers Katherine E. , Pant Lalit M. , Weber Adam Z. , Xiao Xianghui , Parkinson Dilworth Y. , Zenyuk Iryna V.
Published: December 2019

X-ray computed tomography study of operating a PEM electrolyzer shows a catalyst coated membrane configuration, more uniform electrocatalyst distribution and better performance.
Straightforward fabrication of robust Fe-doped Ni3Se2 supported nickel foam as a highly efficient electrocatalyst for the oxygen evolution reaction
Authors: Ghaemmaghami Mostafa , Yamini Yadollah , Saievar-Iranizad Esmaiel , Bayat Amir
Published: December 2019

Fe-doped Ni3Se2 has been prepared on nickel foam through a straightforward, electrodeposition method and showed efficient electrocatalytic activity for the oxygen evolution reaction.
Thermal, electronic and thermoelectric properties of TiNiSn and TiCoSb based quaternary half Heusler alloys obtained fromab initiocalculations
Authors: Choudhary Mukesh K. , Ravindran P.
Published: December 2019

The theoretical analysis of the effect of multi-site substitution based on the 18 valence electron count (VEC) rule on the electrical, thermal and thermoelectric properties of two well known half Heusler (HH) alloys, TiNiSn and TiCoSb, are reported.
MicroRNA files in the prevention of intestinal ischemia/reperfusion injury by hydrogen rich saline
Authors: Yao Weifeng , Lin Xiaoyu , Han Xue , Zeng Lanfen , Guo Anshun , Guan Yu , Hei Ziqing , Liu Jianpei , Huang Pinjie
Published: December 2019

Background: Hydrogen-rich saline (HRS) has been proven effective against ischemia/reperfusion (I/R) injury. However, knowledge on the underlying signaling events remain poor. Having recent highlight of microRNAs (miRNAs) in mediating intestinal I/R injury, we hypothesized that HRS may protect intestine against I/R injury by regulating miRNAs.

Method: Mice were given intraperitoneal injection of saline or HRS once daily for five consecutive days before undergoing intestinal I/R that was induced by 60-min ischemia followed by 180-min reperfusion of superior mesenteric artery. The intestine was collected for histopathological assay, miRNA microarray profiling, Real-Time PCR, and Western blotting. Next, miR-199a-3p mimics or inhibitors were transfected into IEC-6 cells to explore the relationship between HRS treatment and miR-199a-3p.

Results: I/R-induced mucosal injury and epithelial cells apoptosis were attenuated by HRS pretreatment. A total of 64 intestinal I/R-responsive miRNAs were altered significantly by HRS pretreatment, in which we validated four novel miRNAs with top significance by Real-Time PCR, namely miR-199a-3p, miR-296-5p, miR-5126, and miR-6538. Particularly, miR-199a-3p was drastically increased by I/R but reduced by HRS. Computational analysis predicts insulin-like growth factor (IGF)-1, mammalian target of rapamycin (mTOR), and phosphoinositide-3-kinase (PI3K) regulatory subunit 1 as targets of miR-199a-3p, suggesting involvement of the pro-survival pathway, IGF- 1/PI3K/Akt/mTOR. In in vitro experiment, HRS treatment reduced miR-199a-3p level, increase IGF-1, PI3K and mTOR mRNA expression, restore IEC-6 cells viability, and this protective effects were reversed under miR-199a-3p mimics treatment.

Conclusion: Collectively, miR-199a-3p may serve a key role in the anti-apoptotic mechanism of HRS that contributes to its protection of the intestine against I/R injury.
P63 modulates the expression of theWDFY2gene which is implicated in cancer regulation and limb development
Authors: Monti Paola , Ciribilli Yari , Foggetti Giorgia , Menichini Paola , Bisio Alessandra , Cappato Serena , Inga Alberto , Divizia Maria Teresa , Lerone Margherita , Bocciardi Renata , Fronza Gilberto
Published: December 2019

TP63 is a member of the TP53 gene family, sharing a common gene structure that produces two groups of mRNAs’ encoding proteins with different N-terminal regions (ΔN and TA isoforms); both transcripts are also subjected to alternative splicing mechanisms at C-terminus, generating a variety of isoforms. p63 is a master regulator of epidermal development and homoeostasis as well as an important player in tumorigenesis and cancer progression with both oncogenic and tumour suppressive roles. A number of studies have aimed at the identification of p63 target genes, allowing the dissection of the molecular pathways orchestrated by the different isoforms. In the present study we investigated in more detail the p63 responsiveness of the WDFY2 (WD repeat and FYVE domain containing 2) gene, encoding for an endosomal protein identified as a binding partner of the PI-3K/AKT signalling pathway. We showed that overexpression of different p63 isoforms was able to induce WDFY2 expression in TP53-null cells. The p63-dependent transcriptional activation was associated with specific response elements (REs) that have been identified by a bioinformatics tool and validated by yeast- and mammal-based assays. Interestingly, to confirm that WDFY2 belongs to the p63 network of cancer regulation, we analysed the impact of WDFY2 alterations, by showing its frequent deletion in different types of tumours and suggesting its expression level as a prognostic biomarker. Lastly, we identified a chromosomal translocation involving the WDFY2 locus in a patient affected by a rare congenital limb anomaly, indicating WDFY2 as a possible susceptibility gene placed downstream p63 in the network of limb development.
Proposed methodology for online frequency response analysis based on magnetic coupling to detect winding deformations in transformers
Authors: Cheng Yangchun , Bi Jiangang , Chang Wenzhi , Xu Yuan , Pan Xiaohua , Ma Xianwei , Chang Shuai
Published: December 2019

Frequency response analysis is widely used as a method for the offline diagnosis of winding deformations in power transformers. To apply it to a working transformer, people need to determine how to inject the excitation signal and measure the response signal for windings that bear a rated voltage and current. In this study, a method to obtain the frequency response curve online is proposed. It uses the principle of magnetic field coupling to inject a frequency sweep signal into the windings through a Rogowski coil. Another Rogowski coil sensor placed at the root of a high‐voltage bushing is used to measure the response current signal. Experiments on a 72.5 kV bushing show that metal accessories of the bushing have no influence on the injection or the measurement. The feasibility of this method was verified by experiments on charged 110/35/10 kV transformers at a factory and a working 35 kV transformer in a power station. The results show that it is safe to install the Rogowski coil at the root of the high‐voltage bushing. The excitation signal can be injected into live windings and the response signal is measurable. Strong electromagnetic power frequency noise can be reduced and the frequency response curve can be measured online.
Variational Bayesian inference of linear state space models
Authors: Pan Chuanchao , Wang Jingzhuo , Dong Zijian
Published: December 2019

This article studies a variational Bayesian method to fix the linear regression (LR) model of which regressors are Gaussian distributed with non‐zero prior means, and then apply the method to the linear state space (LSS) model. Here, we innovatively transform the LSS model into a special LR model: In each state, the value obtained from the predict step can be seen as the prior mean of the regressors, and the update step can be viewed as the iterative solving in LR model with non‐zero prior means. We simulate the proposed algorithm with high‐dimensional discrete LSS models where most states are prior zeros; simulation results show that the proposed algorithm and its applications in LSS are both effective and reliable.
Design of control and hydraulic drive system for high‐altitude live working vehicle
Authors: Song Wei , Li Yunfeng , Zhang Haibing , Wang Dahong
Published: December 2019

This article mainly introduces the motion control system of high‐altitude live working vehicle and the design of the hydraulic drive system of the trolley. Motion control system is the nerve centre of auxiliary robot for power distribution without interruption. It plays a key role. The hydraulic drive system with trolley provides power support for the insulated bucket of the trolley car. The experimental results show that the design scheme of the control system and the hydraulic drive system can meet the actual operation requirements of the electric car.
Absolute calibration device of the vibration sensor
Authors: Bai Xu
Published: December 2019

Vibration sensor calibration is performed using the absolute calibration method and the comparison calibration method. The comparative calibration method is used to take a carefully calibrated benchmark to the measured sensor and the vibration sensor for a contrast test, the use of standard sensors requires regular inspection to traceability to national standards to ensure the reliability and accuracy of dissemination. From the measurement perspective, using the absolute calibration method to calibrate a laser interference vibration acceleration sensor can achieve high precision, wide field, high reliability calibration to ensure the sensor of high accuracy, vibration signal high reliability is of great significance. The vibration method of absolute calibration is based on laser interference technology research, put forward in the development of the laser absolute method based on the technology of vibration calibration device, a further optimised method of the absolute calibration device, the mathematical model is used to improve the technical indicators and to provide reliable technical guarantee for vibration transducer calibration.
Measurement of the dielectric constant in a microwave near field
Authors: Zhong Zhaoqi , Chen Xiaolong , Huan Huiting
Published: December 2019

This study describes a method based on the measurement of a reflection coefficient to determine the dielectric constant of a sample by near‐field microwave. A mathematical relation between the reflection coefficient and the parameters of a lumped circuit was derived referring to an impedance model of the probe−sample interaction. Theoretical analysis was performed to verify the equivalent model of the interaction between the probe and the sample which is equivalent to the parallel connection of multiple capacitors in a lumped circuit. By considering an equivalent model between the probe and the sample in the near field, the parameter measured by the instrument was converted into the impedance parameter between the needle tip and the sample in the near field, and the impedance parameter was used to obtain the equivalent capacitance of the sample, and the dielectric constant of the sample under testing can be deduced. Different samples under near‐field probes were modelled in a high‐frequency structure simulator. Using a known dielectric constant, the reflection coefficient can be calculated from the coaxial probe model, and compared with the simulation results. The feasibility of the near‐field probe in determining dielectric properties is verified.
Research on broadband dither technique in signal acquisition
Authors: Yin Tong , Chen Xiaolong
Published: December 2019

AD converter is one of the core components in the signal acquisition system. The quality of the signal acquisition system is mainly determined by its internal analogue‐to‐digital converter (ADC) characteristics. However, because of the non‐linearity of the ADC itself, the dynamic acquisition range of the ADC is greatly affected. Here, the broadband dither technique in the signal acquisition process is studied. Dither signals are added to the input signal to increase the dynamic acquisition range of ADC. Here, the dithering process was first simulated through Simulink and subsequently an FPGA‐based broadband dithering module experiment platform was built. The process of signal dithering was implemented. The data were analysed with Simulink and the Spurious Free Dynamic Range (SFDR) of the ADC is obtained. The broadband dither signal can randomise the harmonic distortion phenomenon, verifying that the dithering technique can improve the SFDR of ADC.
Improved RANSAC features image‐matching method based on SURF
Authors: Liu Jinliang , Bu FanLiang
Published: December 2019

For the speed of traditional SIFT algorithm in the feature extraction and matching is slow, the article proposes an improved RANSAC features image matching method based on speeded up robust features (SURF). First of all, detect images features and extract with SURF method, use the fast library for approximate nearest neighbours‐based matcher method to perform initial matching on image feature points. Improve the RANSAC algorithm to increase the probability of correct matching points being sampled. Experimental results show that the improved RANSAC algorithm has high matching accuracy, good robustness, and short running time. It lays the foundation for the subsequent fast image stitching.
Application of improved grey model residual modified fusion algorithm in dissolved gas forecasting
Authors: Wu Wenjie , He Yigang , Duan Jiajun
Published: December 2019

The power transformer directly affects whether the power system can operate safely and reliably, and the prediction of the dissolved gas content in the transformer oil is an effective means to discover transformer defects and latent faults, which helps to better carry out state maintenance work. This study extracts the time series data in transformer oil and analyses the interactions and effects between various gas components in the oil. Then, combined with the changing trend of the content of each component, the original sequence was processed using an accumulated method to extract the intrinsic characteristics of the sequence, thus establishing the MGM(1,n)(grey multivariate model). As the grey prediction model can reduce the prediction accuracy of the sequence with longer time span, this study combines the adaptive regression and Markov correction models to optimise the grey prediction model from the perspective of residual correction. Finally, the accuracy and effectiveness of the model are verified by comparing with the original prediction method.
Polarimetric imaging mode of VLT/SPHERE/IRDIS
Authors: de Boer J. , Langlois M. , van Holstein R. G. , Girard J. H. , Mouillet D. , Vigan A. , Dohlen K. , Snik F. , Keller C. U. , Ginski C. , Stam D. M. , Milli J. , Wahhaj Z. , Kasper M. , Schmid H. M. , Rabou P. , Gluck L. , Hugot E. , Perret D. , Martinez P. , Weber L. , Pragt J. , Sauvage J.-F. , Boccaletti A. , Le Coroller H. , Dominik C. , Henning T. , Lagadec E. , Ménard F. , Turatto M. , Udry S. , Chauvin G. , Feldt M. , Beuzit J.-L.
Published: December 2019

Context. Polarimetric imaging is one of the most effective techniques for high-contrast imaging and for the characterization of protoplanetary disks, and it has the potential of becoming instrumental in the characterization of exoplanets. The Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE) instrument installed on the Very Large Telescope (VLT) contains the InfraRed Dual-band Imager and Spectrograph (IRDIS) with a dual-beam polarimetric imaging (DPI) mode, which offers the capability of obtaining linear polarization images at high contrast and resolution.

Aims. We aim to provide an overview of the polarimetric imaging mode of VLT/SPHERE/IRDIS and study its optical design to improve observing strategies and data reduction.

Methods. For H-band observations of TW Hydrae, we compared two data reduction methods that correct for instrumental polarization effects in different ways: a minimization of the “noise” image (Uϕ), and a correction method based on a polarimetric model that we have developed, as presented in Paper II of this study.

Results. We use observations of TW Hydrae to illustrate the data reduction. In the images of the protoplanetary disk around this star, we detect variability in the polarized intensity and angle of linear polarization that depend on the pointing-dependent instrument configuration. We explain these variations as instrumental polarization effects and correct for these effects using our model-based correction method.

Conclusions. The polarimetric imaging mode of IRDIS has proven to be a very successful and productive high-contrast polarimetric imaging system. However, the instrument performance is strongly dependent on the specific instrument configuration. We suggest adjustments to future observing strategies to optimize polarimetric efficiency in field-tracking mode by avoiding unfavorable derotator angles. We recommend reducing on-sky data with the pipeline called IRDAP, which includes the model-based correction method (described in Paper II) to optimally account for the remaining telescope and instrumental polarization effects and to retrieve the true polarization state of the incident light.
36 GHz methanol lines from nearby galaxies: maser or quasi-thermal emission?
Authors: Humire P. K. , Henkel C. , Gong Y. , Leurini S. , Mauersberger R. , Levshakov S. A. , Winkel B. , Tarchi A. , Castangia P. , Malawi A. , Asiri H. , Ellingsen S. P. , McCarthy T. P. , Chen X. , Tang X.
Published: December 2019

Methanol (CH3OH) is one of the most abundant interstellar molecules, offering a vast number of transitions to be studied, including many maser lines. However, while the strongest Galactic CH3OH lines, the so-called class II masers, show no indications for the presence of superluminous counterparts in external galaxies, the less luminous Galactic class I sources appear to be different. Here we report class I 36 GHz (λ ≈ 0.8 cm) CH3OH 4−1 → 30 E line emission from the nearby galaxies Maffei 2 (D ≈ 6 Mpc) and IC 342 (D ≈ 3.5 Mpc), measured with the 100 m telescope at Effelsberg at three different epochs within a time span of about five weeks. The 36 GHz methanol line of Maffei 2 is the second most luminous among the sources detected with certainty outside the Local Group of galaxies. This is not matched by the moderate infrared luminosity of Maffei 2. Higher-resolution data are required to check whether this is related to its prominent bar and associated shocks. Upper limits for M 82, NGC 4388, NGC 5728 and Arp 220 are also presented. The previously reported detection of 36 GHz maser emission in Arp 220 is not confirmed. Nondetections are reported from the related class I 44 GHz (λ ≈ 0.7 cm) methanol transition towards Maffei 2 and IC 342, indicating that this line is not stronger than its 36 GHz counterpart. In contrast to the previously detected 36 GHz CH3OH emission in NGC 253 and NGC 4945, our 36 GHz profiles towards Maffei 2 and IC 342 are similar to those of previously detected nonmasing lines from other molecular species. However, by analogy to our Galactic center region, it may well be possible that the 36 GHz methanol lines in Maffei 2 and IC 342 are composed of a large number of faint and narrow maser features that remain spatially unresolved. In view of this, a search for a weak broad 36 GHz line component would also be desirable in NGC 253 and NGC 4945.
Measuring bulk flows of the intracluster medium in the Perseus and Coma galaxy clusters usingXMM-Newton
Authors: Sanders J. S. , Dennerl K. , Russell H. R. , Eckert D. , Pinto C. , Fabian A. C. , Walker S. A. , Tamura T. , ZuHone J. , Hofmann F.
Published: December 2019

We demonstrate a novel technique for calibrating the energy scale of the EPIC-pn detector onXMM-Newton, which allows us to measure bulk flows in the intracluster medium (ICM) of the Perseus and Coma galaxy clusters. The procedure uses the fluorescent instrumental background lines present in all observations, in particular, Cu-Kα. By studying their spatial and temporal variations, in addition to incorporating calibration observations, we refined the absolute energy scale of the detector to better than 150 km s−1at the Fe-K line, a large improvement over the nominal calibration accuracy of 550 km s−1. With our calibration, we mapped the bulk motions over much of the central 1200 and 800 kpc of Perseus and Coma, respectively, in spatial regions down to 65 and 140 kpc size. We cross-checked our procedure by comparing our measurements with those found in Perseus byHitomifor an overlapping 65 kpc square region, finding consistent results. For Perseus, there is a relative line-of-sight velocity increase of 480 ± 210 km s−1(1σ) at a radius of 250 kpc east of the nucleus. This region is associated with a cold front, providing direct evidence of the ICM sloshing in the cluster potential well. Assuming the intrinsic distribution of bulk motions is Gaussian, its width is 214 ± 85 km s−1, excluding systematic uncertainties. Removing the sloshing region, this is reduced to 20–150 km s−1, which is similar in magnitude to theHitomiline width measurements in undisturbed regions. In Coma, the line-of-sight velocity of the ICM varies between the velocities of the two central galaxies. Maps of the gas velocity and metallicity provide clues about the merger history of the Coma, with material to the north and east of the cluster core having a velocity similar toNGC 4874, while that to the south and west has velocities close toNGC 4889. Our results highlight the difference between a merging system, such as Coma, where we observe a ∼1000 km s−1range in velocity, and a relatively relaxed system, such as Perseus, with much weaker bulk motions.
NICER observations of the Crab pulsar glitch of 2017 November
Authors: Vivekanand M.
Published: December 2019

Context.The Crab pulsar underwent its largest timing glitch on 2017 Nov. 8. The event was discovered at radio wavelengths, and was followed at soft X-ray energies by observatories, such as XPNAV and NICER.

Aims.This work aims to compare the glitch behavior at the two wavelengths mentioned above. Preliminary work in this regard has been done by the X-ray satellite XPNAV. NICER with its far superior sensitivity is expected to reveal much more detailed behavior.

Methods.NICER has accumulated more than 301 kilo seconds of data on the Crab pulsar, equivalent to more than 3.3 billion soft X-ray photons. These data were first processed using the standard NICER analysis pipeline. Then the arrival times of the X-ray photons were referred to the solar system’s barycenter. Then specific analysis was done to study the specific behavior outlined in the following sections, while taking dead time into account.

Results.The variation of the rotation frequency of the Crab pulsar and its time derivative during the glitch is almost exactly similar at the radio and X-ray energies. The following properties of the Crab pulsar remain essentially constant before and after the glitch: the total X-ray flux; the flux, widths, and peaks of the two components of its integrated profile; and the soft X-ray spectrum. There is no evidence for giant pulses at X-ray energies. However, the timing noise of the Crab pulsar shows quasi sinusoidal variation before the glitch, with increasing amplitude, which is absent after the glitch.

Conclusions.Even the strongest glitch in the Crab pulsar appears not to affect all but one of the properties mentioned above, at either frequency. The fact that the timing noise appears to change due to the glitch is an important clue to unravel as this is still an unexplained phenomenon.
Deep learning for Sunyaev–Zel’dovich detection inPlanck
Authors: Bonjean V.
Published: December 2019

ThePlanckcollaboration has extensively used the sixPlanckHFI frequency maps to detect the Sunyaev–Zel’dovich (SZ) effect with dedicated methods, for example by applying (i) component separation to construct a full-sky map of theyparameter or (ii) matched multi-filters to detect galaxy clusters via their hot gas. Although powerful, these methods may still introduce biases in the detection of the sources or in the reconstruction of the SZ signal due to prior knowledge (e.g. the use of the generalised Navarro, Frenk, and White profile model as a proxy for the shape of galaxy clusters, which is accurate on average but not for individual clusters). In this study, we use deep learning algorithms, more specifically, a U-net architecture network, to detect the SZ signal from thePlanckHFI frequency maps. The U-net shows very good performance, recovering thePlanckclusters in a test area. In the full sky,Planckclusters are also recovered, together with more than 18 000 other potential SZ sources for which we have statistical indications of galaxy cluster signatures, by stacking at their positions several full-sky maps at different wavelengths (i.e. the cosmic microwave background lensing map fromPlanck, maps of galaxy over-densities, and the ROSAT X-ray map). The diffuse SZ emission is also recovered around known large-scale structures such as Shapley, A399–A401, Coma, and Leo. Results shown in this proof-of-concept study are promising for potential future detection of galaxy clusters with low SZ pressure with this kind of approach, and more generally, for potential identification and characterisation of large-scale structures of the Universe via their hot gas.
Research on improving the accuracy of FDM 3D printing process by using a new designed calibrating part
Authors: Păcurar Răzvan , Buzilă Valentin , Păcurar Ancuţa , Guţiu Eugen , Dan Stan Sergiu , Berce Petru
Published: December 2019

The article presents theoretical and experimental research methods that were used at the Technical University of Cluj-Napoca (TUCN) to improve the accuracy of Fused Deposition Modeling (FDM) 3D printing process. Finite element analysis method was successfully used for estimating the shrinkages of an original calibrating part that has been originally conceived for this purpose, this part being finally made using an original software application and FDM 3D printing equipment at TUC-N.
Proposal for Cryogenic Deburring Equipment’s Design and Thermal Insulation
Authors: Campean Rares , Hancu Liana
Published: December 2019

In the paper are presented elements of the deburring technology of rubber or plastic parts in cryogenic conditions. There is a proposal for deburring equipment that follows: simplicity in use, increased production capacity and reduced consumption of liquid nitrogen. The heat transfer through the insulating layer is calculated using several types of thermal insulation: perlite powder, spray-on polyurethane foam and aerogel blanket. The obtained results are used for the design of a cryogenic deburring equipment where the thermal transfer is minimal.
Proposal for a method of measurement and control of surface quality in the course of abrasive waterjet cutting of material
Authors: Kmec Ján , Harničárová Marta , Borzan Cristina , Borzan Marian , Valíček Jan , Kříž Jiří , Kušnerová Milena
Published: December 2019

The paper deals with the automation of the hydroabrasive production process, which leads to higher productivity and production optimization. In the submitted work, the basis of control design is a topography function of surface roughness of abrasive waterjet cut walls, and its functional relations to the controlled speed and to the measured mean values of sound pressure level, including a design of a suitable diagram of connections of controlling elements and equipment. The controlled parameter is the final roughness of a cut wall; in the design, the roughness is program-regulated according to the continuously measured root mean square of sound pressure level by means of continuous control of the traverse speed of cutting head.
A case study of robotic simulations using virtual commissioning supported by the use of virtual reality
Authors: Ružarovský Roman , Holubek Radovan , Delgado Sobrino Daynier Rolando , Velíšek Karol
Published: December 2019

Virtual Commissioning (VC) is a method and tool for verifying and testing the PLC control program on a virtual digital model of the manufacturing system. It allows to visualize and test the control system before the real commissioning of the production systems. The aim of the research is to implement virtual reality (VR) into the VC method and to verify the mutual interaction of signals between the simulation in VR environment, the digital model of the production system and the control system. The introduction of VR in VC increases the concept by adding more realistic visualization and tracking, which extends its validation capabilities. The changes made in VR virtual environment are transferred to the simulation model and can be validated in a real production system. The real production robotic system transformed into a virtual form will be a case study with its verification. Also will be tested security protocols and proven human interaction with the system to control the system through the virtual HMI (virtual user interface) using VR.
Evaluation of the effectiveness of implementing production logistics automation systems supported by computer simulation tools
Authors: Więcek Dariusz , Więcek Dorota , Kuric Ivan , Bučková Monika , Krajčovič Martin
Published: December 2019

In this article, authors described selected logistics automation tools (ASLP) and briefly presentedthe PROMETHEE multi-criteria decision making method in terms of its application in assessing the implementation of ASLP in the field of production logistics. A methodology for preparing the data required toevaluate the ASLP implementation process based on modelling and simulation tools was also proposed.
The Design and the Process Technology of a Rotational Mold
Authors: Pop Alina Bianca , Pop Gheorghe Ioan , Țîțu Mihail Aurel
Published: December 2019

The present paper highlights a series of introduction aspects of the rotational system for slush plastic casting, which are the characteristic elements of this fabrication technology and which consistsof the rotational molding. Also, the structure of a rotational mold and the methods used to obtain themold, are presented. The purpose of this research is to describe the parametric design of a rotationalmold and its fabrication process. The research method used to accomplish this purpose consist of the CAD – Modelling specific software utilized to carry out the parametric design of the rotational mold. After the parametric design it was adopted the manufacturing technology of the mold, using a CAMspecific software. In the final part of the research a few important conclusions were drawn from the bibliographical study and from personal convictions.
Algorithm for designing a hydraulic scissor lifting platform
Authors: Ciupan Cornel , Ciupan Emilia , Pop Emanuela
Published: December 2019

The paper describes the hydraulic scissor platforms and presents an algorithm for their design and optimization. Depending on the dimensions of the platform, the maximum height at which it rises and the maximum load is presented a program for calculating the number of scissors and the forces in the joints. The obtained data allow to choose the type of hydraulic table (with one, two or three scissors) and sizing the elements according to the beneficiary's requirements.
Improving the laser engraving quality of padpainted and spray-painted mechatronic devices
Authors: Braga Ion Cristian , Udroiu Razvan , Nedelcu Anisor
Published: December 2019

Considering the cost reduction in automotive processes, in the case of mechatronic devices that use2-3 colours for symbols, a solution is to replace the multi-component molding injection with the painting of a white component substrate in different colours. However, combined painting techniques, namelypad-painting and spray-painting, can lead to many risks, especially when those symbols are obtained bylaser etching, so removing the final paint layer to let only the first coloured layer be visible. The paper's aim is to present the analysis and reduction of the variation due to the different thickness of the coating layers as well as their drying level by using the ultrasonic measuring techniques and the optical microscopy cross-section to reduce the over-adjusting of the engraving parameters and to improve the final quality of the symbols.
Experimental research regarding carbon fiber/epoxy material manufactured by autoclave process
Authors: Bere Paul , Sabău Emilia , Dudescu Cristian , Neamtu Calin , Fărtan Marius
Published: December 2019

The fiber reinforced polymers (FRP) represent a group of materials with a very impressive development in the last time. There are used in different applications from aerospace to sports or medicine. Carbon fiber reinforced polymer (CFRP) has special properties and tend to replace traditional materials like steel, aluminum alloys or wood. Different procedures were developed to manufacture the CFRP. Autoclave processing can be considered the most important way to obtain the best mechanical properties of this kind of material. In this paper it is presented the autoclave manufacturing process to obtain theCFRP plates. The autoclave polymerization process steps are indicated for the CFRP made of Twill textile prepreg material. The stacking sequence of the layers is [0/90]. To determine the mechanical properties of the material tensile test on standardized specimens was employed. The obtained mechanical material’s properties are comparable with steel but its density was reduced 5.5 times.
Fatigue equivalent load approach for fatigue design
Authors: Raoult Ida , Delattre Benoit
Published: December 2019

Industrial structures undergo complex loading often unsuitable for the design and validation phases of their development. Engineers seek simplified signals to replace them, yet equivalent in terms of fatigue. A general framework for the construction of fatigue equivalent loads is presented, intended to take into account some uncertainty on the structure to which it will apply. The guiding idea is to describe this uncertainty thanks to parameters of a model of the structure, and then to assure the equivalence of damage or failure behavior over the whole range of expected parameters. The approach is applied in the case of structures undergoing multiple inputs of concentrated force.