bluuebunny/crossref_metadata_2025 huggingface dataset:
Author Correction: Methylseleninic Acid Provided at Nutritional Selenium Levels Inhibits Angiogenesis by Down-regulating Integrin β3 Signaling
Authors: Cai Zhihui , Dong Liangbo , Song Chengwei , Zhang Yanqing , Zhu Chenghui , Zhang Yibo , Ling Qinjie , Hoffmann Peter R. , Li Jun , Huang Zhi , Li Wei
Published: March 2020

An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Thyroid autoantibodies in adults with acquired binocular diplopia of unknown origin
Authors: Lee Haeng-Jin , Kim Seong-Joon
Published: March 2020

Patients with acquired adult-onset strabismus mainly present with binocular diplopia. Although cranial nerve palsies are reportedly the most common cause of binocular diplopia in adults, thyroid disease can also cause diplopia. In patients with thyroid-associated ophthalmopathy, upper lid retraction and proptosis are the most common initial findings, but diplopia could be the first manifestation. So far, there has been little information on the diagnostic value of thyroid autoantibodies in patients with strabismus. Therefore, we examined adults with acquired binocular diplopia from 2008 to 2016 and evaluated the presence of thyroid autoantibodies and the relationship between thyroid autoantibody status and clinical characteristics in adults with acquired binocular diplopia. Thyroid autoantibody tests were performed for all patients, unless other causes of diplopia were identified. Fifty one (39%) of 132 patients were positive for thyroid autoantibodies. In the thyroid autoantibody-positive (TAb+) group, microsomal autoantibodies, thyroid-stimulating hormone receptor antibodies, thyroglobulin antibodies, and thyroid-stimulating antibodies were observed in 30, 27, 12, and 7 patients, respectively. The vertical deviation and grade of duction limitation were greater in the TAb+ group. The presence of ocular torsion was 15.5% and 39.5% in the TAb− and TAb+ groups, respectively. Thyroid autoantibody evaluation may be helpful in adults with idiopathic acquired binocular diplopia.
Proteomic mapping of Drosophila transgenic elav.L-GAL4/+ brain as a tool to illuminate neuropathology mechanisms
Authors: Velentzas Athanassios D. , Katarachia Stamatia A. , Sagioglou Niki E. , Tsioka Maria M. , Anagnostopoulos Athanasios K. , Mpakou Vassiliki E. , Theotoki Eleni I. , Giannopoulou Aikaterini F. , Keramaris Konstantinos E. , Papassideri Issidora S. , Tsangaris George Th. , Stravopodis Dimitrios J.
Published: March 2020

Drosophilabrain has emerged as a powerful model system for the investigation of genes being related to neurological pathologies. To map the proteomic landscape of fly brain, in a high-resolution scale, we herein employed a nano liquid chromatography-tandem mass spectrometry technology, and high-content catalogues of 7,663 unique peptides and 2,335 single proteins were generated. Protein-data processing, through UniProt, DAVID, KEGG and PANTHER bioinformatics subroutines, led to fly brain-protein classification, according to sub-cellular topology, molecular function, implication in signaling and contribution to neuronal diseases. Given the importance of Ubiquitin Proteasome System (UPS) in neuropathologies and by using the almost completely reassembled UPS, we genetically targeted genes encoding components of the ubiquitination-dependent protein-degradation machinery. This analysis showed that driving RNAi toward proteasome components and regulators, using the GAL4-elav.L driver, resulted in changes to longevity and climbing-activity patterns during aging. Our proteomic map is expected to advance the existing knowledge regarding brain biology in animal species of major translational-research value and economical interest.
Universal flux patterns and their interchange in superconductors between types I and II
Authors: Vagov A. , Wolf S. , Croitoru M. D. , Shanenko A. A.
Published: March 2020

Experiments with the crossover superconductors between standard types I and II revealed exotic magnetic flux patterns where Meissner domains coexist with islands of the vortex lattice as well as with vortex clusters and chains. Until now a comprehensive theory for such configurations has not been presented. We solve this old-standing fundamental problem by developing an approach which combines the perturbation expansion of the microscopic theory with statistical simulations and which requires no prior assumption on the vortex distribution. Our study offers the most complete picture of the interchange of the superconductivity types available so far. The mixed state in this regime reveals a rich manifold of exotic configurations, which reproduce available experimental results. Our work introduces a pattern formation mechanism that originates from the self-duality of the theory that is universal and not sensitive to the microscopic details.
Oxyanion transport across lipid bilayers: direct measurements in large and giant unilamellar vesicles
Authors: Bąk Krzysztof M. , van Kolck Bartjan , Maslowska-Jarzyna Krystyna , Papadopoulou Panagiota , Kros Alexander , Chmielewski Michał J.
Published: March 2020

A simple, carbazole-based dithioamide receptor transports a variety of biologically relevant anions through lipid bilayers, as shown by direct fluorescent assays in LUVs and GUVs.
Gate voltage impact on charge mobility in end-on stacked conjugated oligomers
Authors: Sun Shih-Jye , Menšík Miroslav , Toman Petr , Chung Cheng-Han , Ganzorig Chimed , Pfleger Jiří
Published: March 2020

Resonances in charge mobility induced by the gate voltage are given by the sum of inter-chain charge population and coherence transfer.
Deciphering the pH-dependence of ground- and excited-state equilibria of thienoguanine
Authors: Didier Pascal , Kuchlyan Jagannath , Martinez-Fernandez Lara , Gosset Pauline , Léonard Jérémie , Tor Yitzhak , Improta Roberto , Mély Yves
Published: March 2020

Proposed photophysics of thGb under acidic conditions.
Electric field modulation in the auxetic effect of BP-analog monolayer As and Sb by first-principles calculations
Authors: Rong Ximing , Li Yu , Han Sun , Cao Peijiang , Zeng Yuxiang , Xu Wangying , Fang Ming , Liu Wenjun , Zhu Deliang , Lu Youming
Published: March 2020

Tunable auxetic properties of BP-analog monolayer As and Sbviaelectric field modulation.
Modulating multi-hole reaction pathways for photoelectrochemical water oxidation on gold nanocatalysts
Authors: Zhang Yuchao , Zhang Yunlu , Guo Wenxiao , Johnston-Peck Aaron C. , Hu Yue , Song Xuening , Wei Wei David
Published: March 2020

Catechol stabilizes photo-generated holes on metal nanoparticles to create a new multi-hole reaction pathway for oxidizing water under visible light.
Using dialkyl amideviaforming hydrophobic deep eutectic solvents to separate citric acid from fermentation broth
Authors: Liu Lijuan , Wei Qifeng , Zhou Yong , Ren Xiulian
Published: March 2020

The separation of citric acids was realized by utilizing hydrophobic deep eutectic solvents (DESs), which were formed by usingN,N-dibutylacetamide as a hydrogen acceptor and citric acid as the hydrogen bond.
Spontaneous deposition of Ir nanoparticles on 2D siloxene as a high-performance HER electrocatalyst with ultra-low Ir loading
Authors: Dai Qi , Meng Qin , Du Cuicui , Ding Feng , Huang Junlin , Nie Jianhang , Zhang Xiaohua , Chen Jinhua
Published: March 2020

Based on the reducibility of siloxene, Ir nanoparticles were spontaneously deposited on siloxene and showed excellent performance for the HER.
Carbon-11 carboxylation of trialkoxysilane and trimethylsilane derivatives using [11C]CO2
Authors: Bongarzone Salvatore , Raucci Nicola , Fontana Igor Camargo , Luzi Federico , Gee Antony D.
Published: March 2020

A simple and rapid carbon-11 carboxylation radiosynthesis method.
Silver-promoted synthesis of vinyl sulfones from vinyl bromides and sulfonyl hydrazides in water
Authors: Zhang Ge , Fu Jian-Guo , Zhao Qian , Zhang Gui-Shan , Li Meng-Yao , Feng Chen-Guo , Lin Guo-Qiang
Published: March 2020

The synthesis of vinyl sulfones via silver-promoted cross-coupling of vinyl bromides with sulfonyl hydrazides was realized.
CRISPR/Cas-directed programmable assembly of multi-enzyme complexes
Authors: Lim Samuel , Kim Jiwoo , Kim Yujin , Xu Dawei , Clark Douglas S.
Published: March 2020

We describe a versatile CRISPR/Cas-based strategy to construct precisely organized, scaffolded multi-enzyme systems with improved productivity.
Unprecedented reductive cyclisation of salophen ligands to tetrahydroquinoxalines during metal complex formation
Authors: Lamb Katie J. , Dowsett Mark R. , North Michael , Parker Rachel R. , Whitwood Adrian C.
Published: March 2020

The synthesis of novel tetrahydroquinoxalines by a metal induced one-electron reductive cyclisation of salophen ligands was found to occur when a salophen ligand was treated with chromium(ii) chloride or decamethylcobaltocene.
Correlating alkyl chain length with defect passivation efficacy in perovskite solar cells
Authors: Feng Wenhuai , Zhang Chengxi , Zhong Jun-Xing , Ding Liming , Wu Wu-Qiang
Published: March 2020

Anchoring of amine ligands with different alkyl chain lengths on perovskites mitigates non-radiative charge recombination in perovskite solar cells.
Unambiguous localization of titanium and iron cations in doped manganese hollandite nanowires
Authors: Gómez-Recio Isabel , Azor-Lafarga Alberto , Ruiz-González M. Luisa , Hernando María , Parras Marina , Calvino José Juan , Fernández-Díaz María Teresa , Portehault David , Sanchez Clement , González-Calbet José M.
Published: March 2020

Chemical and structural features in Fe and Ti manganese doped hollandites are reported by diffraction and advanced imaging techniques.
Investigation of coherency stress-induced phase separation in AlN/AlxGa1−xN superlattices grown on sapphire substrates
Authors: Yao Weizhen , Li Fangzheng , Wang Lianshan , Liu Sheng , Wei Hongyuan , Yang Shaoyan , Wang Zhanguo
Published: March 2020

Suppression of compositional non-uniformity in AlxGa1−xN layers by using AlN/AlxGa1−xN superlattices through adjusting stresses in AlN/AlxGa1−xN layers is demonstrated.
A peculiar dehydration and solid–solid phase transition of the active pharmaceutical ingredient AZD9898 based on in situ single crystal-to-single crystal transformations
Authors: Pettersen Anna , Putra Okky Dwichandra , Light Mark E. , Namatame Yukiko
Published: March 2020

Isostructural dehydration from form A hydrate to form B, and solid–solid phase transition from form B to C of AZD9898 were revealed by in situ single crystal-to-single crystal transformations.
New 2D layered structures with direct fluorine–metal bonds: MF(CH3COO) (M: Sr, Ba, Pb)
Authors: Zänker S. , Scholz G. , Heise M. , Emmerling F. , Kemnitz E.
Published: March 2020

New coordination polymers with 2D network structures with fluorine directly coordinated to the metal ion were prepared both via mechanochemical synthesis and fluorolytic sol–gel synthesis.
Precision measurement of the fundamental vibrational frequencies of tritium-bearing hydrogen molecules: T2, DT, HT
Authors: Lai K.-F. , Hermann V. , Trivikram T. M. , Diouf M. , Schlösser M. , Ubachs W. , Salumbides E. J.
Published: March 2020

High-resolution coherent Raman spectroscopy of all three tritium-containing molecular hydrogen – T2, DT and HT – were performed to determine the ground electronic state fundamental Q-branch transition frequencies at accuracies of 0.0005 cm−1.
Electronic structural critique of interesting thermal and optical properties of C17Ge germagraphene
Authors: Datta Sujoy , Jana Debnarayan
Published: March 2020

We report a theoretical attempt to understand the involvement of the electronic structure in producing spin Hall conductivity and in determining the optical and thermal properties of germagraphene, a buckled two-dimensional material with low work function.
Ligand binding to G-quadruplex DNA: new insights from ultraviolet resonance Raman spectroscopy
Authors: Di Fonzo Silvia , Amato Jussara , D’Aria Federica , Caterino Marco , D’Amico Francesco , Gessini Alessandro , Brady John W. , Cesàro Attilio , Pagano Bruno , Giancola Concetta
Published: March 2020

Polarized ultraviolet resonance Raman scattering at 266 nm was used to investigate the interaction of BRACO-19 and Pyridostatin with G-quadruplexes having different structural conformations.
Constructing a tetraphenylethene (TPE) derivative-decorated polyvinyl alcohol (PVA)/lanthanide nanoparticle composite system for tunable luminescence
Authors: Huang Songyang , Wu Jianbin , Li Jiale , Yu Lirong , Wang Xi , Bai Ming
Published: March 2020

It is found for the first time that TPEBA-modified PVA ligand-coated lanthanide nanoparticles display tunable luminescent properties due to the established energy transfer from the TPE-based ligand (donor) to the lanthanide nanoparticles (acceptor).
An entirely solvent-free photooxygenation of olefins under continuous flow conditions
Authors: Bayer Patrick , Jacobi von Wangelin Axel
Published: March 2020

Photooxygenations of alkenes with singlet oxygen have been performed under solvent-free conditions in a flow reactor under VIS irradiation. The reaction operates at very high substrate/sensitizer ratios and enables high space–time yields.
Synthesis of an amino phosphinodiselenoic acid ester and β-amino diselenides employing P2Se5
Authors: Roopesh Kumar L. , Sagar N. R. , Divya K. , Madhu C. , Sureshbabu Vommina V
Published: March 2020

Protic solvents furnished amino phosphinodiselenoic acid esters, whereas β-amino diselenides were obtained exclusively when reactions performed in polar aprotic solvents.
A facile synthesis of magnetic fluorescence Fe3O4-carbon dots for the detection and removal of Hg2+
Authors: Tang Mingyu , Ren Guojuan , Chai Fang
Published: March 2020

This article reports a one-pot hydrothermal strategy for preparing fluorescence carbon dots with magnetic properties (Fe3O4-CDs). The Fe3O4-CDs can be utilized for the detection of Hg2+, simultaneously accompanied with a magnetic removal process.
In situ construction of a poly-3,4-ethylenedioxythiophene skeleton on carbon nanotubes to improve long-term stability for oxygen reduction reaction
Authors: Li Jing , Ma Jinfu , Lu Hui , Sheng Zhilin , Yang Shaolin , Wu Jiandong
Published: March 2020

Although carbon nanomaterials show good potential as efficient electrocatalysts for oxygen reduction reaction (ORR), their inferior long-term stability due to their high surface energy resulting in compact restacking limits their practical performance.
B-site cobalt-doped perovskite oxide BaNiO3 oxygen sorbents for performance improvement of oxygen enriched gas production
Authors: Jiang Yuhang , Shen Qiuwan , Li Shian , Yang Guogang , Huang Naibao
Published: March 2020

B-site cobalt-doped perovskite oxide BaNiO3 oxygen sorbents have been synthesized by an EDTA sol–gel method and further applied for producing oxygen.
Stereoselective preparation of P,axial-stereogenic allenyl bisphosphine oxides via chirality-transfer
Authors: Qiu Mao-Ran , Zheng Hong-Xing , Ye Jing-Jing , Yan Bing-Xia , Zhao Chang-Qiu , Li Qiang
Published: March 2020

Allenyl bisphosphine oxides having variable chirality were prepared in high dr, which was controlled by chiral carbon and phorphorus.
6,N2-Diaryl-1,3,5-triazine-2,4-diamines: synthesis, antiproliferative activity and 3D-QSAR modeling
Authors: Junaid Ahmad , Lim Felicia Phei Lin , Chuah Lay Hong , Dolzhenko Anton V.
Published: March 2020

New compounds selectively targeting the triple negative MDA-MB231 breast cancer cells were used to build a 3D-QSAR model.
Ultrathin sulfate-intercalated NiFe-layered double hydroxide nanosheets for efficient electrocatalytic oxygen evolution
Authors: Jiang Xiao-Xiao , Xue Jiang-Yan , Zhao Zhong-Yin , Li Cong , Li Fei-Long , Cao Chen , Niu Zheng , Gu Hong-Wei , Lang Jian-Ping
Published: March 2020

Ultrathin NiFe-LDH nanosheets with sulfate interlayer anions prepared in gram-scale via one-pot solvothermal method exhibited excellent OER activity.
Synthesis of 3-trifluoromethylated 1,3-butadienes via a Pd(0)-catalyzed fluorinated Heck reaction
Authors: Li Yang , Hao Meng , Xia Ming , Sun Ning , Zhang Cai-Lin , Zhu Wen-Qing
Published: March 2020

1,3-Butadienes play a key role in modern synthetic chemistry and biochemistry because they are well-known precursors for the synthesis of retinoids.
Induction of circularly polarized electroluminescence from achiral poly(fluorene-alt-benzothiadiazole) by circularly polarized light
Authors: Cheng Junjie , Ge Feng , Xiang Yifeng , Zhang Hongli , Kuai Yan , Hou Penghui , Zhang Douguo , Qiu Longzhen , Zhang Qijin , Zou Gang
Published: March 2020

Without any chiral additives, achiral F6BT could be induced to directly give a preferential emission of specific handed CP EL.
Factors Influencing Presence or Absence of Laterality During Pharyngeal Bolus Clearance
Authors: Garand Kendrea L. , Thomas Taylor , Dey Rajarshi
Published: March 2020

Purpose

The aim of this study was to identify factors influencing pharyngeal laterality of bolus clearance through the pharyngoesophageal segment.

Method

Two swallowing trials (5-ml nectar-thickened liquid and 5-ml pudding) administered in the anteroposterior viewing plane during videofluoroscopy were extracted from a normative database of 195 healthy adult participants. Each swallow was determined as either having no laterality, right dominance/right side only, or left dominance/left side only. Descriptive measures were performed on all data variables. Chi-square tests were performed to determine the relationship between laterality and several factors, including age category, sex, race, and swallow task.

Results

The majority of swallows demonstrated no laterality. No significant associations were observed between laterality and the following factors: age category, race, or swallow task. Significant differences in laterality were observed between males and females, with females more likely to demonstrate no laterality.

Conclusions

Majority of swallows in the current healthy sample demonstrated no laterality preference. If present, males were more likely to demonstrate laterality compared to females. Laterality observed during videofluoroscopy does not imply impairment if there are no other factors present influencing bolus flow into the esophagus (e.g., mass). Study findings further define typical swallowing behaviors, allowing clinicians to better delineate normal variations from true impairment. Further research should include a larger sample of individuals aged 80 years and older, as well as additional swallowing tasks, to further investigate patient- and bolus-related factors on laterality.
Accurate exponential histogram test method for ADC linearity test
Authors: Wu Minshun , Ban Cheng , Guo Yi , Xu Jiangtao , Geng Li
Published: March 2020

An accurate exponential histogram test (EHT) method is proposed for the ADC linearity test. Different from conventional EHT methods which estimate ADC static parameters only based on the number of hits, the proposed method accurately estimates the ADC transition levels, differential non‐linearity and integral non‐linearity by creative utilisation of the information of stimulus signal. As a result, the proposed method avoids the errors introduced by the assumed proportional relationship between the code width and the number of hits in conventional methods. Simulation results show that the proposed method outperforms the conventional methods in terms of accuracy and robustness.
Compact dual‐band balanced SIW bandpass filter with two adjustable closed‐passbands
Authors: Liu Yijie , Zhang Gang , Zheng Jian
Published: March 2020

A new compact multilayer dual‐band‐balanced bandpass filter (BPF) with two flexibly adjustable closed‐passbands based on substrate‐integrated waveguide (SIW) resonator is proposed in this letter. Both TE102‐mode and TE201‐mode of the resonator are utilised to achieve desired differential mode (DM) transmission and high common mode suppression. Two SIW cavities are properly coupled in the back‐to‐back form to realise a closed dual‐passband‐balanced response by virtue of singly one cruciform coupling aperture etched on the ground. Additionally, two pairs of perturbed slotlines are elaborately introduced on the top and bottom layers to perturb the resonant frequencies of TE102‐mode and TE201‐mode, realising both adjustable upper‐ and lower‐DM passbands. For demonstration, a prototype dual‐band‐balanced SIW BPF operating at 12.7 and 15.5 GHz is designed, fabricated and tested. Measured and simulated results are in good agreement, verifying the feasibility of the design concept.
Automatic labelling of brain tissues in MR images through spatial indexes based hybrid atlas forest
Authors: Liu Hong , Xu Lijun , Song Enmin , Jin Renchao , Hung Chih‐Cheng
Published: March 2020

The multi‐atlas‐based methods are widely applied in the automatic labelling in magnetic resonance (MR) images. However, most multi‐atlas‐based methods require that all atlases be registered to the target image accurately to have a correct label propagation. In this study, the authors introduce the term spatial indexes and construct a hybrid atlas forest model to gather the labelling information from all atlases without propagating labels from every single atlas. Furthermore, a new automatic labelling method using the hybrid atlas forest model based on spatial indexes is proposed. In the proposed framework, an atlas is chosen arbitrarily as a reference image and the spatial indexes are constructed on this image space. Then, the samples are selected from all atlases in the dataset based on the spatial indexes to construct a samples pool. Finally, the hybrid atlas forest model will be trained on the samples pool and used to predict the labelling of the target. Experiments are conducted on two public datasets to evaluate the effectiveness of the proposed method. The experimental results show that the proposed method reduces the requirement of strong dependence on precise registration and improve the accuracy of labelling.
Neural network‐based image quality comparator without collecting the human score for training
Authors: Bao Long , Panetta Karen , Agaian Sos
Published: March 2020

Emulating human behaviours in automated image quality assessment (IQA) enables a comparator framework to remove the differences in human bias naturally. Based on the observation of the practical applications of IQA, this study focuses on similar‐content image quality comparison based on a new image quality comparator (IQC). Outstanding proven IQAs can be utilised in this comparator to achieve a new non‐linear combination strategy to boost the IQAs' performance in image quality comparison. For both input images to be compared, proven IQAs are utilised to obtain nine features from each image, yielding 18 total features. Then, a four‐layer comparison network conducts a classification task to indicate which input image has better quality. In the training phase, the commonly used human scores as training labels are replaced with pairwise comparison results that are automatically generated from assigned distortion level differences. By not utilising human score in training phase, this IQC shows two advantages: (i) it removes huge labor and time cost to collect the human scores and (ii) it solves the problem of over‐fitting benefiting from simplicity of creating a large image training dataset. Furthermore, the experimental tests and cross‐dataset validation comparison tests demonstrate its impressive performance.
Structure preservation in content‐aware image retargeting using multi‐operator
Authors: Garg Ankit , Negi Ashish
Published: March 2020

The evolution of image retargeting technique demands the exploitation of multi‐operators since they are capable of preserving the structure and salient objects of the image. However, these multi‐operators are mostly based on seam carving with scaling or cropping operators which lead to significant distortions in the retargeted image. This study proposes a new multi‐operator scheme which has improved seam carving, through the proposed seam diversion based image retargeting algorithm, integrated with the cropping and warping operator. A total of six different multi‐operator schemes have been proposed out of which the MO6 technique gave remarkable results in terms of image quality, least distortion, and lowest run‐time. To simplify image retargeting operations, an optimised image distance function was used. The optimised image distance function was formulated which combines bidirectional image Euclidean distance, dominant colour descriptor, and an energy‐based coefficient to bypass seams from the point where seams start clashing and hence the defined threshold violates. By integrating cropping and warping into the proposed algorithm, it preserves the salient features of the retargeted images. Typical results have been presented which demonstrates the effectiveness of the proposed methods. User‐based subjective analysis has also been carried out which shows that image retargeted using the MO6 technique has high user preference.
Multi‐objectives optimisation of features selection for the classification of thyroid nodules in ultrasound images
Authors: Aboudi Noura , Guetari Ramzi , Khlifa Nawres
Published: March 2020

Ultrasound (US) imaging is the leading diagnostic method for assessing the early‐stage thyroid nodule. However, the visual evaluation of nodules can be influenced by the subjectivity of radiologists' interpretations. Computer‐aided Diagnostic (CAD) systems can be useful in classifying these nodules according to their benign or malignant nature. The extraction of the characteristics, which relate in the author's case to the US of thyroid nodules, is essential in the differentiation of these nodules. The complex nature of images, however, generates a significant number of features, many of which are either redundant or irrelevant. This study presents a new CAD system that has been developed to categorise thyroid nodules. In this survey, 447 US images of thyroid nodules were retained. These images were used to extract features using statistical features extraction methods. A feature selection method based on the multi objective particle swarm optimisation algorithm was used to choose the most relevant and non‐redundant ones. Then, support vector machine (SVM) and random forests (RFs) were applied to classify these nodules. 10‐fold cross‐validation was used to assess the classification performance metrics. Their proposed CAD has reached a maximum accuracy of 94.28% for SVM; and 96.13% for RF using the contour‐based ROI.
Passivity‐based output admittance shaping of the converter‐side current‐controlled grid‐tied inverter to improve the robustness to the grid impedance
Authors: Qian Qiang , Xie Shaojun , Xu Jinming , Bian Shenyiyang , Zhong Nini
Published: March 2020

In the LCL‐filtered grid‐tied inverter, the classical low‐cost control strategy which is composed of the single converter‐side current control and the unit grid voltage feedforward compensation, is commonly employed to inject the sinusoidal current into the utility. However, the inverter output admittance features the non‐passive behaviour, which indicates that the harmonic currents may be amplified under the disturbances of the grid voltage and the grid impedance. Therefore, two dedicated current loops based on only the converter‐side current feedback are proposed, which consist of the low‐pass filter‐based current regulation and the high‐pass filter‐based active damping (HFAD). The mixed asymmetrical regular sampling method is further used to reduce the control delay of the HFAD. Moreover, the low‐pass filter‐based feedforward is developed to make a compromise between the disturbance rejection and the stability. Fair comparisons with other typical control strategies are made through analysing the virtual resistor in parallel with the filter capacitor, which reveals that the positive virtual resistance at the frequency lower than half of the switching frequency is maintained. With the elaborated control parameters, the exhaustive experimental results finally verify the effectiveness of the proposed method in passivating the inverter output admittance.
Semi‐valley switching method for buck LED driver to increase its efficiency and performance
Authors: Sangrody Reza , Sangrody Hossein , Marzband Mousa , Pouresmaeil Edris
Published: March 2020

Valley switching is one of the most efficient methods to decrease the switching losses in DC/DC converters. It uses a resonance between the converter's inductor and parasitic output capacitance of a metal–oxide–semiconductor field‐effect transistor. In this study, the drawbacks of the valley switching in buck light‐emitting‐diode (LED) drivers are investigated. It shows that in spite of decreasing the switching losses, the valley switching method reduces its efficiency in some conditions. Also, it is clarified that the valley switching method not only causes current fluctuation in boost power factor correction converters but also malfunctions the buck LED drivers' performance. In this study, a semi‐valley switching and its implementation are introduced to solve these problems. In general, it is shown that the proposed method improves both the efficiency and the performance of the buck LED driver, simultaneously. The methodologies are implemented in an experimental prototype to verify the proposed method.
Synergistic effects of co‐combustion of sewage sludge and corn stalk and the resulting gas emission characteristics
Authors: Guo Shuai , Han Yang , Wang Liye , Che Deyong , Liu Hongpeng , Sun Baizhong
Published: March 2020

Increasing discharge of sewage sludge is a threat to the ecological environment, and sludge treatment via combustion is the most feasible alternative. However, the low calorific value and high‐water content of raw sludge results in poor firing performance and increases the risk of environmental pollution. Recently, co‐combustion has emerged as a more environment‐friendly technology. Herein, the combustion behaviours of sewage sludge, corn stalk and their mixture at four heating rates were studied via thermogravimetric experiments. Results yielded the division of weight loss into three stages for corn stalk: dehydration, combustion of volatiles and combustion of fixed carbon; four stages were identified for sewage sludge and the mixture of sludge and stalk: dehydration, combustion of volatiles, combustion of fixed carbon and thermal decomposition of a small amount of minerals. Synergistic analyses found that with a 60% blending ratio of sewage sludge, interaction between the components in the high‐temperature range was greatly promoted. Gas emission characteristics showed that CO2 was the main product during (co‐)combustion, while the NOx emissions at low (or high) temperatures for the blend were higher (or lower) than the theoretical values. Temperature had little effect on H2S emissions, though it significantly affected SO2 emissions during co‐combustion.
Bipercentile parameter estimators of bias reduction for generalised Pareto clutter model
Authors: Yu Han , Shui Peng‐Lang , Lu Kai , Zeng Wei‐Liang
Published: March 2020

The generalised Pareto distribution is an efficient model to characterise the high‐resolution sea clutter. Robust and precise estimation of the model's parameters is a precondition of effective target detection in sea clutter. It is known that the explicit bipercentile (BiP) estimators are efficient in computation and robust to outliers. In this study, it is proved that the explicit BiP estimators are also consistent with respect to sample size. In practical applications, only limited samples are available and the bias of the BiP estimators degrades the estimation precision. The properties of the biases are analysed and BiP estimators of bias reduction are constructed by the look‐up table method. The BiP estimators of bias reduction are verified by simulated data and measured sea clutter data.
Improved algorithm for de‐interleaving radar signals with overlapping features in the dynamically varying electromagnetic environment
Authors: Jiang Wen , Fu Xiongjun
Published: March 2020

As an indispensable part of electronic support measure, the de‐interleaving technique is used to separate interleaved radar pulse streams. At present, clustering based on radar features is one of the most effective de‐interleaving methods. In a dynamically varying electromagnetic environment, the features of intercepted radar pulses overlap each other. Compared with other de‐interleaving algorithms, the fuzzy adaptive resonance theory (Fuzzy ART) has obvious advantages in classifying such radar features. However, it still faces several problems: (i) the vigilance parameter used to regulate de‐interleaving performance is difficult to reach its optimal value and (ii) since the unified discrimination threshold is selected for different regions, the algorithm suffers from category proliferation problem. This study addresses these problems by constructing a new vigilance model to replace the unified vigilance parameter and introducing a dual‐vigilance mechanism to ART‐based de‐interleaving systems. It demonstrates this idea in the context of Fuzzy ART, presented as Fuzzy ART based on a 3D fuzzy model with two vigilance thresholds (2VT‐3DFA). 2VT‐3DFA suppressed the excessive proliferation of categories, and its clustering quality was 20% higher than that of conventional algorithms in dynamically varying signal environment.
Preparation and loads transfer behaviour of graphene/halloysite organic–inorganic hybrid aerogel
Authors: He Lili , Jiao Yufeng , Dou Yunhui , Hu Ming , Zhang Jie , Xia Chunyan , Sun Jianbo , Zhao Huaqi
Published: March 2020

Aerogel materials have wide research and application in the fields of thermal insulation and functional materials. Although graphene sheet has high strength in conventional graphene aerogels, the interaction between sheets is weak. The overall strength of graphene aerogels is not high enough. Aerogels, especially halloysite aerogels, have been successfully synthesised in recent years, but their electrical potential expansion is slightly insufficient. Therefore, in view of the enhancement of the mechanical properties of aerogels and the development of electrical potential, the idea of organic–inorganic hybrid (OIH) aerogel was proposed. Graphene halloysite OIH aerogel materials were prepared by graphene sheets and halloysite fibres. The preparation and microstructure of materials were characterised using Fourier‐transform infrared spectroscopy, X‐ray diffraction, scanning electron microscopy, X‐ray photoelectron spectroscopy and nitrogen adsorption–desorption. Meanwhile, the mechanical properties of aerogels were also studied, and the stress transfer behaviour of aerogels was investigated by Raman spectroscopy. The results showed that the OIH aerogel was successfully obtained. The strength of the OIH aerogels was much higher than that of the mixture of graphene and halloysite aerogel. The OIH network aerogels had more effective stress transfer effect depending on the chemical bonds between the networks.
Model exploration of near-IR ro-vibrational CO emission as a tracer of inner cavities in protoplanetary disks
Authors: Antonellini S. , Banzatti A. , Kamp I. , Thi W.-F. , Woitke P.
Published: March 2020

Context. Near-IR observations of protoplanetary disks provide information about the properties of the inner disk. High-resolution spectra of abundant molecules such as CO can be used to determine the disk structure in the warm inner parts. The v2∕v1 ro-vibrational ratio of v1−0 and v2−1 transitions has recently been observed to follow distinct trends with the CO emitting radius in a sample of TTauri and Herbig disks; these trends have empirically been interpreted as due to depletion of the inner disk from gas and dust.

Aims. We use thermochemical disk models to explore the to interpret the trends of these CO ro-vibrational CO emission.

Methods. We used the radiation thermochemical code ProDiMo to explore a set of previously published models with different disk properties and varying one parameter at a time: the inner radius, the dust-to-gas mass ratio, and the gas mass. In addition, we used models in which we changed the surface density power-law index, and employed a larger set of CO ro-vibrational levels that also include fluorescence from the first electronic state. We investigated these models for TTauri and Herbig star disks. Finally, we included a set of DIANA models for individual TTauri and Herbig disks that were constructed to reproduce a large set of multiwavelength observations.

Results. This modeling exploration highlights promising parameters that may explain the observed trends in ro-vibrational CO emission. Our models with an increasing inner radius match the observed trend for TTauri disks, in which we were also able to account for the vertical spread in the data by different values for the dust-to-gas mass ratio and for the disk gas mass in different disks. Our models instead match the CO vibrational ratio observed in Herbig disks only in the case of large inner holes and cannot produce the low ratios that are measured in many disks. The models do produce an inversion in the trend, where v2−1∕v1−0 increases and does not decrease for CO radii larger than a few au. The reason for this is that the P(4) v2−1 line becomes optically thin and superthermally excited. In our models, this does not require invoking UV fluorescence pumping.

Conclusions. Our modeling explorations suggest that the observed decrease in v2−1∕v1−0 with CO radius in TTauri disks might be a consequence of inside-out disk depletion. For the Herbig disks, a more complex inner disk structure may instead be needed to explain the observed trends in the excitation of CO emission as a function of emitting radius: disk gaps emptied of dust, partially depleted in gas, and/or possibly a disk structure with an inverted surface density profile. These structures need to be further investigated in future work.
Tidal and general relativistic effects in rocky planet formation at the substellar mass limit using N-body simulations
Authors: Sánchez Mariana B. , de Elía Gonzalo C. , José Downes Juan
Published: March 2020

Context. Recent observational results show that very low mass stars and brown dwarfs are able to host close-in rocky planets. Low-mass stars are the most abundant stars in the Galaxy, and the formation efficiency of their planetary systems is relevant in the computation of a global probability of finding Earth-like planets inside habitable zones. Tidal forces and relativistic effects are relevant in the latest dynamical evolution of planets around low-mass stars, and their effect on the planetary formation efficiency still needs to be addressed.

Aims. Our goal is to evaluate the impact of tidal forces and relativistic effects on the formation of rocky planets around a star close to the substellar mass limit in terms of the resulting planetary architectures and its distribution according to the corresponding evolving habitable zone.

Methods. We performed a set of N-body simulations spanning the first 100 Myr of the evolution of two systems composed of 224 embryos with a total mass 0.25 M⊕ and 74 embryos with a total mass 3 M⊕ around a central object of 0.08 M⊙. For these two scenarios we compared the planetary architectures that result from simulations that are purely gravitational with those from simulations that include the early contraction and spin-up of the central object, the distortions and dissipation tidal terms, and general relativistic effects.

Results. We found that including these effects allows the formation and survival of a close-in (r < 0.07 au) population of rocky planets with masses in the range 0.001 < m∕M⊕ < 0.02 in all the simulations of the less massive scenario, and a close-in population with masses m ~ 0.35 M⊕ in just a few of the simulations of the more massive scenario. The surviving close-in bodies suffered more collisions during the integration time of the simulations. These collisions play an important role in their final masses. However, all of these bodies conserved their initial amount of water in mass throughout the integration time.

Conclusions. The incorporation of tidal and general relativistic effects allows the formation of an in situ close-in population located in the habitable zone of the system. This means that both effects are relevant during the formation of rocky planets and their early evolution around stars close to the substellar mass limit, in particular when low-mass planetary embryos are involved.
Study of a Clean Microgrid for the Japanese Antarctica Showa Base
Authors: Shoki F , Obara S
Published: March 2020

The Antarctica Showa Base has been powered primarily by diesel power generation. However, heavy oil fossil fuel is used for power generation by diesel generators. The Showa base is located in Antarctica, so there is heat demand throughout the year. Therefore, the capacity of transportation of fuel and emissions of carbon dioxide has become an issue. For these reasons, the construction of clean energy systems using renewable energy in order to locally produce energy for local consumption is being planned. In this study, we will design a microgrid based on the introduction of renewable energy (photovoltaics generation and wind power generators) and solid oxide fuel cell (SOFC), which does not emit carbon dioxide during power generation and can use heat cascades. However, there is a risk of a power failure because the power quality decreases with the introduction of renewable energy. In this paper, we clarified the introduction rate of renewable energy with the lowest frequency fluctuation and clarified the introduction limit of renewable energy in summer and winter.
Assessment of Blade Strength for Small Wind Turbine Applications
Authors: Zawadzki K. , Kuzalski C. , Śmiechowicz W. , Tarkowski M. , Kądrowski D. , Stępień M. , Kulak M. , Lipian M.
Published: March 2020

Small Wind Turbines (SWTs) are an increasingly developing Renewable Energy Source, thanks to the gradual popularisation of the prosumer energy generation approach. This, however, requires maximum safety of the machine, working next to households. Reliability is also necessary from the financial point of view, as SWTs should withstand 20 - 30 years of operation without any serious failure to ensure investment profitability. The weakest SWT element is arguably its most exposed one - the rotor - hence the important role played by the blade strength tests. The experimental analysis becomes preferable with increasing popularity of new materials (composites) and production techniques (additive manufacturing). This paper sets out to develop a test stand for static strength examination of 3D-printed SWT blades. This kind of objects is often considered as more vulnerable to structural failures than those created via machining techniques, due to their anisotropic structure, so ensuring structural integrity is crucial for safety reasons.
Simulation of Tidal Energy Extraction, Using Fluent Model
Authors: Alizadeh Hamedani Hamidreza
Published: March 2020

This study has been performed to develop our knowledge about marine sources energy extraction. Water in the channel has been simulated in laboratory scale by means of FLUENT software. The turbine tidal flow is generated by a moving disk which applies a pressure decrement with energy dissipation. Free water surface is estimated by means of fluid volume in the model which changes freely. The numerical results illustrate that eddy sequence has been generated after the tidal flow of turbine and a flow acceleration is generated nearby, especially beneath the energy extraction devise. Free water surface drop due to energy extraction is considered in model results that seems a to improve the turbine eddy sequence.
La constellation transférentielle au sein de l’équipe de La Velotte
Authors: Pointurier Amélie , Descourty Annie , Joedicke Christophe
Published: March 2020

Cet article présente le travail en équipe au sein du Centre psychothérapiquee de La Velotte. À travers une présentation clinique nous montrons comment la constellation transférentielle se déploie au cœur de notre équipe, et comment elle nous permet de restituer au patient les différentes parties clivées qu’il a pu projeter à l’extérieur de lui-même. Nous soulignons la notion de « solution délirante », ou de respect de l’espace délirant, qu’il est indispensable de préserver au cours d’un cheminement psychique comme celui qu’Alban effectue à l’Hôpital de Jour de La Velotte. Nous montrons également comment nous tentons de le rejoindre afin d’installer un espace psychique partagé, de co-thérapie, qui va lui permettre d’avancer dans le travail d’autonomie psychique et pragmatique qu’il a à faire pour construire sa vie.
The management of contaminated goods in Japan since the Fukushima accident
Authors: Maître M. , Croüail P. , Durand V. , Lecomte J.-F. , Charron S. , Schneider T.
Published: March 2020

Feedback analyses from Chernobyl and Fukushima post-accident situations have clearly emphasized the importance of management strategies for contaminated goods during the days, months and years after the accident. For instance, following the accident, the management of contaminated goods generally focuses on the implementation of protective actions, radiological countermeasures and the control of radioactivity in foodstuffs, in order to ensure the quality and sales of the food products. Then, issues concerning the loss of image of local products can appear, and subsequent strategies have to be taken to restore the consumer confidence. Based on a literature review and interviews performed between 2016 and 2018 with Japanese stakeholders involved in the Fukushima accident recovery, this paper analyses the strategies for the management of contaminated goods which have been implemented in Japan. Divided into three main parts, this paper highlights how producers/livestock breeders, agricultural cooperatives, consumers and even distributors gradually committed themselves to (i) ensure the radiological quality of products by implementing countermeasures and monitoring systems, (ii) maintain sustainable economic activity by encouraging the resumption of agricultural activities and by deploying various sales strategies and try to (iii) restore consumer confidence by initiating producer/consumer dialogues and promotional actions for local products.
Nach deutschem Standard
Authors: Woelke Angelika
Published: March 2020

Mitten in Manila, im pulsierenden Makati, dem Business-Distrikt der philippinischen Hauptstadt, bildet das deutsche Unternehmen TRUECARE in Zusammenarbeit mit einer Sprachschule Pflegekräfte für den deutschen Markt aus.