bluuebunny/crossref_metadata_2025 huggingface dataset:
The Ratios of monounsaturated to saturated phosphatidylcholines in lung adenocarcinoma microenvironment analyzed by Liquid Chromatography-Mass spectrometry and imaging Mass spectrometry
Authors: Muranishi Yusuke , Sato Toshihiko , Ito Shinji , Satoh Junko , Yoshizawa Akihiko , Tamari Shigeyuki , Ueda Yuichiro , Yutaka Yojiro , Menju Toshi , Nakamura Tatsuo , Date Hiroshi
Published: June 2019

Adenocarcinoma is the most common type of lung cancer, and can be classified into various histologic subtypes. However, little is known about the subtype-dependent variations in lipid metabolism processes. We performed dual lipidomic analyses using liquid chromatography–mass spectrometry (LC-MS) and matrix-assisted laser desorption/ionization imaging mass spectrometry (MALDI-IMS) to identify possible biomarkers to distinguish adenocarcinoma specimens from normal lung specimens, and to determine if there are any differences in lipid metabolism among the histologic subtypes (lepidic, acinar, papillary, micropapillary, solid, and mucinous). LC-MS was used to characterize the lipid profiles of lung adenocarcinoma and normal lung tissue, and MALDI-IMS analysis was performed to confirm the results with information on lipid localization within the lung. LC-MS analysis found significant differences in the relative abundances of phosphatidylcholine (PC)(16:0/16:0) (P = 0.0432) and sphingomyelin (SM)(42:2) (P < 0.0001) between adenocarcinoma and normal lung specimens. The ratios of PC(16:0/16:1)/PC(16:0/16:0), PC(16:0/18:1)/PC(16:0/16:0), and PC(16:0/18:1)/PC(16:0/18:0) were significantly higher in adenocarcinoma specimens (P = 0.02221, P = 0.0004, and P = 0.0215, respectively). MALDI-IMS analysis confirmed that these ratios were significantly higher in adenocarcinoma regions of the lung. The ratio of PC(16:0–18:1)/PC(16:0–18:0) was significantly lower in solid subtypes than in other subtypes (P = 0.0028). The monounsaturated/saturated PC ratios may have applications in adenocarcinoma diagnoses and subtyping.
Optimized electrochemical performance of Ni rich LiNi0.91Co0.06Mn0.03O2 cathodes for high-energy lithium ion batteries
Authors: Lee Seung-Hwan , Lee Seul , Jin Bong-Soo , Kim Hyun-Soo
Published: June 2019

We report high electrochemical performances of LiNi0.91Co0.06Mn0.03O2 cathode material for high-energy lithium ion batteries. LiNi0.91Co0.06Mn0.03O2 is synthesized at various sintering temperatures (640~740 °C). The sintering temperatures affect crystallinity and structural stability, which play an important role in electrochemical performances of LiNi0.91Co0.06Mn0.03O2. The electrochemical performances are improved with increasing sintering temperature up to an optimal sintering temperature. The LiNi0.91Co0.06Mn0.03O2 sintered at 660 °C shows remarkably excellent performances such as initial discharge capacity of 211.5 mAh/g at 0.1 C, cyclability of 85.3% after 70 cycles at 0.5 C and rate capability of 90.6% at 2 C as compared to 0.5 C. These results validate that LiNi0.91Co0.06Mn0.03O2 sintered at 660 °C can be regarded as a next generation cathode.
Coupled flow accumulation and atmospheric blocking govern flood duration
Authors: Najibi Nasser , Devineni Naresh , Lu Mengqian , Perdigão Rui A. P.
Published: June 2019

We present a physically based Bayesian network model for inference and prediction of flood duration that allows for a deeper understanding of the nexus of antecedent flow regime, atmospheric blocking, and moisture transport/release mechanisms. Distinct scaling factors at the land surface and regional atmospheric levels are unraveled using this Bayesian network model. Land surface scaling explains the variability in flood duration as a function of cumulative exceedance index, a new measure that represents the evolution of the flood in the basin. Dynamic atmospheric scaling explains the cumulative exceedance index using the interaction between atmospheric blocking system and the synergistic model of wind divergence and atmospheric water vapor. Our findings underline that the synergy between a large persistent low-pressure blocking system and a higher rate of divergent wind often triggers a long-duration flood, even in the presence of moderate moisture supply in the atmosphere. This condition in turn causes an extremely long-duration flood if the basin-wide cumulative flow prior to the flood event was already high. Thus, this new land-atmospheric interaction framework integrates regional flood duration scaling and dynamic atmospheric scaling to enable the coupling of ‘horizontal’ (for example, streamflow accumulation inside the basin) and ‘vertical’ flow of information (for example, interrelated land and ocean-atmosphere interactions), providing an improved understanding of the critical forcing of regional hydroclimatic systems. This Bayesian model approach is applied to the Missouri River Basin, which has the largest system of reservoirs in the United States. Our predictive model can aid in decision support systems for the protection of national infrastructure against long-duration flood events.
Calaxin is required for cilia-driven determination of vertebrate laterality
Authors: Sasaki Keita , Shiba Kogiku , Nakamura Akihiro , Kawano Natsuko , Satouh Yuhkoh , Yamaguchi Hiroshi , Morikawa Motohiro , Shibata Daisuke , Yanase Ryuji , Jokura Kei , Nomura Mami , Miyado Mami , Takada Shuji , Ueno Hironori , Nonaka Shigenori , Baba Tadashi , Ikawa Masahito , Kikkawa Masahide , Miyado Kenji , Inaba Kazuo
Published: June 2019

Calaxin is a Ca2+-binding dynein-associated protein that regulates flagellar and ciliary movement. In ascidians, calaxin plays essential roles in chemotaxis of sperm. However, nothing has been known for the function of calaxin in vertebrates. Here we show that the mice with a null mutation in Efcab1, which encodes calaxin, display typical phenotypes of primary ciliary dyskinesia, including hydrocephalus, situs inversus, and abnormal motility of trachea cilia and sperm flagella. Strikingly, both males and females are viable and fertile, indicating that calaxin is not essential for fertilization in mice. The 9 + 2 axonemal structures of epithelial multicilia and sperm flagella are normal, but the formation of 9 + 0 nodal cilia is significantly disrupted. Knockout of calaxin in zebrafish also causes situs inversus due to the irregular ciliary beating of Kupffer’s vesicle cilia, although the 9 + 2 axonemal structure appears to remain normal.
MCRIP1 promotes the expression of lung-surfactant proteins in mice by disrupting CtBP-mediated epigenetic gene silencing
Authors: Weng Jane S. , Nakamura Takanori , Moriizumi Hisashi , Takano Hiroshi , Yao Ryoji , Takekawa Mutsuhiro
Published: June 2019

Proper regulation of epigenetic states of chromatin is crucial to achieve tissue-specific gene expression during embryogenesis. The lung-specific gene products, surfactant proteins B (SP-B) and C (SP-C), are synthesized in alveolar epithelial cells and prevent alveolar collapse. Epigenetic regulation of these surfactant proteins, however, remains unknown. Here we report that MCRIP1, a regulator of the CtBP transcriptional co-repressor, promotes the expression of SP-B and SP-C by preventing CtBP-mediated epigenetic gene silencing. Homozygous deficiency of Mcrip1 in mice causes fatal respiratory distress due to abnormal transcriptional repression of these surfactant proteins. We found that MCRIP1 interferes with interactions of CtBP with the lung-enriched transcriptional repressors, Foxp1 and Foxp2, thereby preventing the recruitment of the CtBP co-repressor complex to the SP-B and SP-C promoters and maintaining them in an active chromatin state. Our findings reveal a molecular mechanism by which cells prevent inadvertent gene silencing to ensure tissue-specific gene expression during organogenesis.
Fabrication of a soluble crosslinked corn bran arabinoxylan matrix supports a shift to butyrogenic gut bacteria
Authors: Zhang Xiaowei , Chen Tingting , Lim Jongbin , Xie Jianhua , Zhang Bin , Yao Tianming , Hamaker Bruce R.
Published: June 2019

A soluble crosslinked corn bran arabinoxylan matrix promotes butyrate and butyrogenic bacteria.
Spectral counterstaining in luminescence-enhanced biological Raman microscopy
Authors: Pelc Radek , Mašek Vlastimil , Llopis-Torregrosa Vicent , Bouř Petr , Wu Tao
Published: June 2019

Lanthanide luminescence facilitates navigation in Raman images of living cells by lifting the ‘spectral fog’ inherently present in them.
Deciphering the origin of variation in the spin ground state and oxidation state of a {Mn19} cluster on a Au(111) surface: is the Au(111) surface innocent?
Authors: Nabi Rizwan , Rajaraman Gopalan
Published: June 2019

Modeling the structure of a {Mn19} cluster on an Au(111) surface reveals that exchange coupling constants vary grossly upon adsorption due to surface-induced structural distortions. This leads to significant variations in the ground state S values.
A diquat-containing macrocyclic anion acceptor in pure water
Authors: Lei Ye , Shen Libo , Liu Ji-Ren , Jiao Tianyu , Zhang Yang , Zhang Chi , Tong Lu , Hong Xin , Pan Yuanjiang , Li Hao
Published: June 2019

A self-assembled diquat-containing tetracationic macrocycle is obtained in a high yield, which demonstrates its anion recognition ability in pure water.
Organotin(iv) differential fluorescent probe for controlled subcellular localization and nuclear microviscosity monitoring
Authors: Bernal-Escalante Jasmine , López-Vázquez Armando , Araiza-Olivera Daniela , Jiménez-Sánchez Arturo
Published: June 2019

A dual-emissive fluorescent probe based on the organotin(iv) ion enabled unique tracking of the local microviscosity through a differential and controlled nuclear–cytosolic redistribution.
Hydrogen bond dynamics and conformational flexibility in antipsychotics
Authors: Pereira Jose E. M. , Eckert Juergen , Rudic Svemir , Yu Dehong , Mole Richard , Tsapatsaris Nikolaos , Bordallo Heloisa N.
Published: June 2019

Deciphering the dynamics of bioactive molecules using neutron spectroscopy to assist in the prediction of binding affinities.
A comparative study on the dynamic heterogeneity of supercooled polymers under nanoconfinement
Authors: Li Shu-Jia , Qian Hu-Jun , Lu Zhong-Yuan
Published: June 2019

Dynamic gradient and faster dynamics on average in polymer thin films are two leading factors, resulted from the nanoconfinement effect, have distinct influences on spatial and temporal parts of the dynamic heterogeneity in the system.
Orbiting resonances in the F + HD (v = 0, 1) reaction at very low collision energies. A quantum dynamical study
Authors: Sáez-Rábanos V. , Verdasco J. E. , Herrero V. J.
Published: June 2019

Orbiting resonances in the F + HD reaction at very low collision energies.
The role of titanium-oxo clusters in the sulfate process for TiO2 production
Authors: Kozma Karoly , Wang Maoyu , Molina Pedro I. , Martin Nicolas P. , Feng Zhenxing , Nyman May
Published: June 2019

Titanium–sulphate solutions preceding TiO2-nanoparticle precipitation contain exclusively pentagon-shaped clusters with no apparent structural similarity, confounding our understanding of crystal growth.
2,2′-Dipyridylamines: more than just sister members of the bipyridine family. Applications and achievements in homogeneous catalysis and photoluminescent materials
Authors: Wang S. , Bruneau C. , Renaud J.-L. , Gaillard S. , Fischmeister C.
Published: June 2019

2,2′-Dipyridylamine derivatives: Discreet members of the polydentate nitrogen ligand familly with underestimated potential.
An interface stabilized perovskite solar cell with high stabilized efficiency and low voltage loss
Authors: Yoo Jason J. , Wieghold Sarah , Sponseller Melany C. , Chua Matthew R. , Bertram Sophie N. , Hartono Noor Titan Putri , Tresback Jason S. , Hansen Eric C. , Correa-Baena Juan-Pablo , Bulović Vladimir , Buonassisi Tonio , Shin Seong Sik , Bawendi Moungi G.
Published: June 2019

Newly developed passivation strategy results in unprecedented perovskite optoelectronic device performances.
Ion effects on molecular interaction between graphene oxide and organic molecules
Authors: Liu Zilong , Rios-Carvajal Tatiana , P. Andersson Martin , Ceccato Marcel , Stipp Susan L. S. , Hassenkam Tue
Published: June 2019

Interactions between graphene oxide (GO) and organic molecules play a role in processes such as environmental remediation and water treatment.
A fundamental understanding of whole biomass dissolution in ionic liquid for regeneration of fiber by solution-spinning
Authors: Nguyen Ngoc A. , Kim Keonhee , Bowland Christopher C. , Keum Jong K. , Kearney Logan T. , André Nicolas , Labbé Nicole , Naskar Amit K.
Published: June 2019

Molecular interactions, chain alignment and entanglement of the hybrid poplar biomass in ionic liquid were investigated for fiber manufacturing.
Controlling metal oxide nanoparticle size and shape with supercritical fluid synthesis
Authors: Lane Mary Kate Mitchell , Zimmerman Julie B.
Published: June 2019

Supercritical fluid nanoparticle synthesis (SCF nano synthesis) can robustly and readily control size and shape of metal oxide nanoparticles, while offering a potentially greener synthetic route through the employment of green solvents.
Thermographic characterization of thin liquid film formation and evaporation in microchannels
Authors: Habibi Matin Meisam , Fazeli Abdolreza , Moghaddam Saeed
Published: June 2019

Using novel microsensors, the formation and evaporation of thin liquid films in microchannels are characterized.
Weaving nanostructures with site-specific ion induced bidirectional bending
Authors: Garg Vivek , Chou Tsengming , Liu Amelia , De Marco Alex , Kamaliya Bhaveshkumar , Qiu Shi , Mote Rakesh G. , Fu Jing
Published: June 2019

Weaving nanostructures with site-specific ion induced bidirectional bending and a typical 3D folded nanostructure in the form of a mesh.
Molecular design and selection of 1,2,5-oxadiazole derivatives as high-energy-density materials
Authors: Xiao Menghui , Jin Xinghui , Zhou Jianhua , Hu Bingcheng
Published: June 2019

A family of 1,2,5-oxadiazole-based energetic compounds were designed and their properties were investigated fully by density functional theory.
Pyridyl and pyrimidyl chalcogenolates of coinage metals and their utility as molecular precursors for the preparation of metal chalcogenides
Authors: Jain Vimal K.
Published: June 2019

Synthesis of and metallophilic interactions in N-heterocyclic chalcogenolates of coinage metals have been described and their utility as molecular precursors for binary and ternary chalcogenide materials has been demonstrated.
Patching laser-reduced graphene oxide with carbon nanodots
Authors: Strauss Volker , Muni Mit , Borenstein Arie , Badamdorj Bolortuya , Heil Tobias , Kowal Matthew D. , Kaner Richard
Published: June 2019

The performance of electric double layer capacitor (EDLC) electrodes based on 3D-graphene obtained by laser-assisted reduction of graphene oxide (GO) is improved by addition of carbon nanodots (CND) to the GO precursor material.
Transition from vesicles to nanofibres in the enzymatic self-assemblies of an amphiphilic peptide as an antitumour drug carrier
Authors: Gong Zhongying , Liu Xiaoying , Dong Jinhua , Zhang Weifen , Jiang Yuanfei , Zhang Jinhui , Feng Weiguo , Chen Kun , Bai Jingkun
Published: June 2019

The enzyme-responsive self-assembly of the amphiphilic peptide A6K2 and the release of an antitumour drug (DOX) from the self-assembled nanovesicles of the amphiphilic peptide.
Crystallographic characterization of Er3N@C2n (2n = 80, 82, 84, 88): the importance of a planar Er3N cluster
Authors: Hu Shuaifeng , Zhao Pei , Shen Wangqiang , Yu Pengyuan , Huang Wenhuan , Ehara Masahiro , Xie Yunpeng , Akasaka Takeshi , Lu Xing
Published: June 2019

The crystallographic structures of Er3N@Ih(7)-C80, Er3N@D5h(6)-C80, Er3N@C2v(9)-C82, Er3N@Cs(51365)-C84, and Er3N@D2(35)-C88 are identified for the first time.
Total syntheses of several iridolactones and the putative structure of noriridoid scholarein A: an intramolecular Pauson–Khand reaction based one-stop synthetic solution
Authors: Salam Abdus , Ray Sayan , Zaid Md. Abu , Kumar Dileep , Khan Tabrez
Published: June 2019

A general synthetic strategy featuring a diastereoselective intramolecular Pauson–Khand reaction (IPKR) and some tactical synthetic manoeuvres to access ten iridoids in a stereocontrolled manner is delineated.
Reactive oxygen species-responsive theranostic nanoparticles for enhanced hypoxic tumor photodynamic therapyviasynchronous HIF-1α inhibition and ATP depletion
Authors: Zhao Caiyan , Li Yunhao , Shao Leihou , Wang Xuan , Lu Jianqin , Li Xianlei , Chen Long , Cui Xinyue , Sheng Wang , Deng Xiongwei , Wu Yan
Published: June 2019

ROS-responsive nanoparticles were designed to co-deliver the small molecule HIF-1α inhibitor Doxy and the photosensitizer IR780 for enhanced PDT efficiency.
Correction: A novel and actual mode for study of soil degradation and transportation of difenoconazole in a mango field
Authors: Zhao Fangfang , Liu Jingkun , Xie Defang , Lv Daizhu , Luo Jinhui
Published: June 2019

Correction for ‘A novel and actual mode for study of soil degradation and transportation of difenoconazole in a mango field’ by Fangfang Zhao et al., RSC Adv., 2018, 8, 8671–8677.
A sensitized thermal cell recovered using heat
Authors: Matsushita S. , Araki T. , Mei B. , Sugawara S. , Inagawa Y. , Nishiyama J. , Isobe T. , Nakajima A.
Published: June 2019

A sensitized thermal cell makes it possible to obtain stable electric power by only burying the cell in a heat source and turning a switch on and off.
Promoting hydrogen absorption of liquid organic hydrogen carriers by solid metal hydrides
Authors: Wu Yong , Yu Hongen , Guo Yanru , Zhang Yuxuan , Jiang Xiaojing , Sun Bingxue , Fu Kai , Chen Jun , Qi Yue , Zheng Jie , Li Xingguo
Published: June 2019

The reversible hydrogen absorption/desorption property of REH3 can be utilized to promote the hydrogen absorption of N-ethylcarbazole on Ni/Al2O3.
A sensitive cyclic signal amplification fluorescence strategy for determination of methyltransferase activity based on graphene oxide and RNase H
Authors: Zhao Han , Ma Changbei , Yan Ying , Chen Mingjian
Published: June 2019

A sensitive fluorometric method for DNA methyltransferase activity detection based on graphene oxide and RNase H-assisted signal amplification.
Pressure-enhanced ferroelectric polarisation in a polar perovskite-like [C2H5NH3]Na0.5Cr0.5(HCOO)3metal–organic framework
Authors: Ptak Maciej , Collings Ines E. , Svane Katrine L. , Sieradzki Adam , Paraguassu Waldeci , Mączka Mirosław
Published: June 2019

We report high-pressure X-ray diffraction and Raman studies combined with DFT calculations.
Toxicity of combined exposure of ZnO nanoparticles (NPs) and myricetin to Caco-2 cells: changes of NP colloidal aspects, NP internalization and the apoptosis-endoplasmic reticulum stress pathway
Authors: Wu Chaohua , Luo Yunfeng , Liu Liangliang , Xie Yixi , Cao Yi
Published: June 2019

Phytochemicals as typical food components may significantly influence the toxicity of nanoparticles (NPs) in intestinal cells, indicating a need to evaluate the toxicological effects of NPs in a complex situation. Previous studies suggested that the anti-oxidative properties of phytochemicals were important to elicit cytoprotective effects against NP exposure. However, we recently found that the changes of signaling pathways may be more important for cytoprotective effects of phytochemicals. In this study, we investigated the influence of myricetin (MY) on the cytotoxicity of ZnO NPs in Caco-2 cells and the possible mechanism. MY at 50 μM showed minimal impact on the solubility and colloidal aspects of ZnO NPs, but protected Caco-2 cells from NP exposure as it increased the EC50 value. For comparison, dihydromyricetin (DMY; chemical analog of MY) increased the EC50 value to a much lesser extent. Exposure to ZnO NPs significantly induced intracellular Zn ions, whereas MY or DMY did not significantly influence the internalization of NPs. However, ZnO NPs significantly promoted the ratio of caspase-3/pro-caspase-3, which was inhibited by the presence of MY. Exposure to ZnO NPs did not significantly promote the biomarkers of endoplasmic reticulum (ER) stress, but co-exposure to ZnO NPs and MY significantly lowered the levels of a panel of ER stress biomarkers. In conclusion, these results suggested that MY could protect Caco-2 cells from ZnO NP exposure, which may not be related to the changes of colloidal stability or internalization of NPs but could be alternatively related to the reduction of ER stress leading to lower cleaved caspase-3.
Energy‐efficient single‐stage solar PV powered sensorless PMSM drive for water pumping
Authors: Murshid Shadab , Singh Bhim
Published: June 2019

This work presents a speed sensorless permanent magnet synchronous motor (PMSM) drive for single‐stage solar photovoltaic (PV) powered water pumping. The elimination of speed sensor reduces the system cost and improves the system robustness. The estimation of rotor speed and position is achieved through estimation of stator flux from voltage and current in stationary reference frame. Conventional maximum power point technique uses two sensors for PV array voltage and current sensing. In the presented work, an effort is made to eliminate the PV array current sensor without compromising the system performance. The proposed system is modelled and its performance is simulated in MATLAB/Simulink. The experimental performance is validated on a developed laboratory prototype using a digital signal processor (DS‐1202). A comprehensive comparison is made to validate the significance of the proposed work.
Globular cluster candidates in the Galactic bulge: Gaia and VVV view of the latest discoveries
Authors: Gran F. , Zoccali M. , Contreras Ramos R. , Valenti E. , Rojas-Arriagada A. , Carballo-Bello J. A. , Alonso-García J. , Minniti D. , Rejkuba M. , Surot F.
Published: June 2019

Context. Thanks to the recent wide-area photometric surveys, the number of star cluster candidates have risen exponentially in the last few years. Most detections, however, are based only on the presence of an overdensity of stars in a given region or an overdensity of variable stars, regardless of their distance. As candidates, their detection has not been dynamically confirmed. Therefore, it is currently unknown how many and which of the published candidates are true clusters and which are chance alignments.

Aims. We present a method to detect and confirm star clusters based on the spatial distribution, coherence in motion, and appearance on the color-magnitude diagram. We explain and apply this approach to one new star cluster and several candidate star clusters published in the literature.

Methods. The presented method is based on data from the second data release of Gaia complemented with data from the VISTA Variables in the Vía Láctea survey for the innermost bulge regions. This method consists of a nearest neighbors algorithm applied simultaneously over spatial coordinates, star color, and proper motions to detect groups of stars that are close in the sky, move coherently, and define narrow sequences in the color-magnitude diagram, such as a young main sequence or a red giant branch.

Results. When tested in the bulge area (−10 <  ℓ (deg) <  +10; −10 <  b (deg) <  +10) the method successfully recovered several known young and old star clusters. We report in this work the detection of one new, likely old star cluster, while deferring the others to a forthcoming paper. Additionally, the code has been applied to the position of 93 candidate star clusters published in the literature. As a result, only two of these clusters are confirmed as coherently moving groups of stars at their nominal positions.
Quantifier la contribution des parcelles et les temps de transit de l’eau souterraine pour protéger la qualité des captages d’eau potable
Authors: Attard G. , Rossier Y. , Bardonnet J. , Eisenlohr L.
Published: June 2019

En France, plusieurs milliers de captages d’eau potable présentent une dégradation avérée de la qualité de l’eau due aux pollutions diffuses, par exemple liée aux nitrates ou aux micropolluants. Une bonne partie d’entre eux exploite une ressource de nappe libre, en milieu poreux. Les gestionnaires de ces captages ont besoin de connaître les secteurs sur lesquels agir en priorité pour améliorer la qualité de l’eau prélevée et le temps de retour sur investissement des actions engagées sur les aires d’alimentation de captage (AAC). Cet article présente une méthode cartographique simple d’utilisation permettant d’optimiser les programmes d’actions consacrés à la reconquête qualitative de ces captages. Cette méthode repose sur le choix, la projection et le traitement dans un système d’information géographique (SIG) d’abaques mis à disposition par le Centre d’études et d’expertise sur les risques, l’environnement, la mobilité et l’aménagement (Cerema). Ces abaques ont été élaborés par modélisation numérique déterministe en résolvant l’équation d’advection-dispersion en écoulement inversé. Les données nécessaires pour l’application de cette méthode sont : une cartographie de l’AAC avec la localisation du captage, une carte piézométrique de l’aquifère et sa perméabilité, la recharge pluviométrique de la nappe et le débit du captage. La projection d’un abaque sur une AAC permet d’obtenir une cartographie des parcelles qui ont la plus forte contribution à l’alimentation du captage ainsi que les temps de transit de l’eau souterraine jusqu’au captage les plus courts. Ainsi, la méthode proposée constitue une aide à la décision pour la construction des programmes d’actions destinés à reconquérir la qualité des captages d’eau potable et permet le suivi et l’analyse des actions déjà mises en œuvre.
Méthodologie d’évaluation des tendances temporelles de contamination dans les sédiments et les matières en suspension des systèmes aquatiques continentaux
Authors: Yari A. , Dabrin A. , Coquery M.
Published: June 2019

Les directives européennes requièrent que les États membres surveillent la contamination des sédiments continentaux et vérifient que les concentrations en contaminants hydrophobes et métaux dans les sédiments n’augmentent pas de manière significative au cours du temps. En France métropolitaine, les agences de l’eau coordonnent la surveillance des milieux aquatiques continentaux, mais ne disposent pas d’une méthodologie harmonisée permettant d’exploiter les données de contamination des sédiments de surface. À cela s’ajoutent des freins opérationnels, en raison de la difficulté à prélever des sédiments fins et comparables dans le temps résultant de l’hétérogénéité naturelle des sédiments. Aussi, le prélèvement de matières en suspension (MES), qui cible préférentiellement les particules fines, constitue une alternative intéressante au suivi des sédiments de surface. Une réflexion prenant en compte ces difficultés a été menée par Aquaref (Laboratoire national de référence pour la surveillance des milieux aquatiques) afin de proposer une méthodologie pour l’évaluation des tendances de contamination des sédiments. Cette méthodologie a été testée partir des données de surveillance, notamment en normalisant les données pour s’affranchir de la variabilité naturelle des sédiments. Des recommandations sur la qualité nécessaire des chroniques pour une exploitation fiable ont été formulées. Ainsi, sous réserve de disposer de chroniques comportant suffisamment de données et de paramètres normalisateurs, cette méthodologie permet d’identifier des tendances significatives et d’étudier l’évolution temporelle des contaminations à l’échelle d’une station. L’application de cette méthodologie sur des données de MES a permis de démontrer l’intérêt d’effectuer un suivi des MES pour évaluer les tendances de contamination, en raison de l’homogénéité de la fraction échantillonnée au cours du temps. Les comparaisons entre résultats obtenus sur des données de sédiments et de MES montrent que ces dernières peuvent permettre une étude plus fine des tendances. Les approches proposées constituent une première étape pour répondre aux exigences réglementaires, et pour une meilleure exploitation des données de contamination des sédiments.
Study of the dynamic performance of a thrust stand for small-thrust liquid-pulsed thrusters
Authors: Xing Qin , Li Teng , Zhang Jun , Ren Zong-jin
Published: June 2019

Small-thrust liquid-pulsed thrusters can achieve higher efficiency and more accurate control when operating in pulsed mode. However, the pulsed characteristic makes it challenging to measure the thrust. This paper describes a thrust stand for directly measuring the pulsed thrust from small-thrust liquid-pulsed thrusters. The proposed stand is based on a unique piezoelectric dynamometer on which the thruster is mounted through a connecting frame. A thrust experiment is conducted by applying a trapezoidal pulsed force, similar to the thrust generated by small-thrust liquid-pulsed thrusters, to the thrust stand. The experimental results show that the thrust stand can quickly trace the input trapezoidal force signal, although its output waveform exhibits obvious oscillations. Based on the experimental frequency response data, a thrust stand transfer function model is constructed, and this model is used to analyze the dynamic response performance of the thrust stand. The step response and trapezoidal pulse response of the thrust stand are obtained, and the influence of the damping ratio on the dynamic performance of the thrust stand is analyzed. A damping compensation transfer function is established to improve the dynamic measurement performance of the thrust stand. Compensated results are obtained by using the raw output from the thrust stand as the input to the damping compensation transfer function. The damping compensation method does not change the natural frequencies of the thrust stand, does not need any additional filtering process, effectively eliminates the waveform oscillations of the thrust stand output, and ensures good consistency between the input and output signals.
Shilnikov problem in Filippov dynamical systems
Authors: D. Novaes Douglas , Teixeira Marco A.
Published: June 2019

In this paper, we introduce the concept of sliding Shilnikov orbits for 3D Filippov systems. In short, such an orbit is a piecewise smooth closed curve, composed by Filippov trajectories, which slides on the switching surface and connects a Filippov equilibrium to itself, namely, a pseudo-saddle-focus. A version of Shilnikov’s theorem is provided for such systems. Particularly, we show that sliding Shilnikov orbits occur in generic one-parameter families of Filippov systems and that arbitrarily close to a sliding Shilnikov orbit there exist countably infinitely many sliding periodic orbits. Here, no additional Shilnikov-like assumption is needed in order to get this last result. In addition, we show the existence of sliding Shilnikov orbits in discontinuous piecewise linear differential systems. As far as we know, the examples of Fillippov systems provided in this paper are the first to exhibit such a sliding phenomenon.
1/f noise analysis in high mobility polymer-based OTFTs with non-fluorinated dielectric
Authors: Muhea Wondwosen E. , Romanjek K. , Mescot X. , Theodorou C. G. , Charbonneau M. , Mohamed F. , Ghibaudo G. , Iñiguez B.
Published: June 2019

In this paper, Low Frequency Noise (LFN) characterization of SP500 polymer-based Organic Thin Film Transistors with a nonfluorinated dielectric material is presented. The work aimed at identifying the mechanism of 1/f noise as well as inspecting the quality of the gate dielectric interface. Analysis of the LFN experimental data reveals that the 1/f noise power spectral density (PSD) follows 1/f γ frequency dependence over 1 Hz–10 kHz range. The normalized current noise PSD is found to vary similar to the squared-transconductance drain current ratio with respect to drain current, and is inversely related to the gate-area. Furthermore, the high carrier mobility (on the order of 2–3 cm2/Vs) obtained in these devices indicates that low density of traps exists in the semiconducting organic thin film. Such results ascribed the origin of 1/f noise to the dynamic exchange of charge carriers between the gate-dielectric traps and the channel. In addition, Nst values extracted from the 1/f noise experimental data reflect the enhanced quality of the gate dielectric and the interface it forms with the channel material.
Multi-susceptible single-phase BaAlxFe12−xO19 ceramics with both improved magnetic and ferroelectric properties
Authors: Shao Ye , Huang Fengzhen , Xu Xingyu , Yan Shuo , Yang Chunbin , Zhou Min , Lu Xiaomei , Zhu Jinsong
Published: June 2019

The structural, electric, and magnetic properties were investigated in multisusceptible BaAlxFe12−xO19 (x = 0, 1, 2, and 3) ceramics. It is found that the magnetic domain structure changes abruptly with the increase in the Al3+ concentration, which is responsible for the abnormal coercivity enhancement and the distinct initial magnetization behavior. Smaller Al3+ doping increases the off-center displacement of Fe3+ ions at the trigonal bipyramid by introducing compressive strain, which thus enhances the stability of the ferroelectric phase and improves the ferroelectric Curie temperature of BaFe12O19. Moreover, more stable Al3+ ions can increase the resistance of BaFe12O19. The present results highlight the possible application of Al3+ doped BaFe12O19 ceramics as a multisusceptible single-phase material on multifunctional electronic devices.
Accurate interaction energies by spin component scaled Möller-Plesset second order perturbation theory calculations with optimized basis sets (SCS-MP2
mod
): Development and application to aromatic heterocycles
Authors: Cacelli Ivo , Lipparini Filippo , Greff da Silveira Leandro , Jacobs Matheus , Livotto Paolo Roberto , Prampolini Giacomo
Published: June 2019

The Spin Component Scaled (SCS) MP2 method using a reduced and optimized basis set (SCS-MP2mod) is employed to compute the interaction energies of nine homodimers, formed by aromatic heterocyclic molecules (pyrrole, furan, thiophene, oxazole, isoxazole, pyridine, pyridazine, pyrimidine, and pyrazine). The coefficients of the same-spin and opposite-spin correlation energies and the Gaussian type orbitals (GTO) polarization exponents of the 6-31G** basis set are simultaneously optimized in order to minimize the energy differences with respect to the coupled-cluster with single, double and perturbative triples excitations [CCSD(T)] reference interaction energies, extrapolated to a complete basis set. It is demonstrated that the optimization of the spin scale factors leads to a noticeable improvement of the accuracy with a root mean square deviation less than 0.1 kcal/mol and a largest unsigned deviation smaller than 0.25 kcal/mol. The pyrrole dimer provides an exception, with a slightly higher deviation from the reference data. Given the high benefit in terms of computational time with respect to the CCSD(T) technique and the small loss of accuracy, the SCS-MP2mod method appears to be particularly suitable for extensive sampling of intermolecular potential energy surfaces at a quantum mechanical level. Within this framework, a transferability test of the SCS-MP2mod parameters to a benchmark set of this class of molecules is very promising as the reference interaction energies of several heterocyclic aromatic heterodimers were reproduced with a standard deviation of 0.30 kcal/mol. The SCS-MP2mod remarkably outperforms the value of 1.95 kcal/mol obtained with standard MP2/6-31G**.
Disentangling the multi-scale effects of sea-surface temperatures on global precipitation: A coupled networks approach
Authors: Ekhtiari Nikoo , Agarwal Ankit , Marwan Norbert , Donner Reik V.
Published: June 2019

The oceans and atmosphere interact via a multiplicity of feedback mechanisms, shaping to a large extent the global climate and its variability. To deepen our knowledge of the global climate system, characterizing and investigating this interdependence is an important task of contemporary research. However, our present understanding of the underlying large-scale processes is greatly limited due to the manifold interactions between essential climatic variables at different temporal scales. To address this problem, we here propose to extend the application of complex network techniques to capture the interdependence between global fields of sea-surface temperature (SST) and precipitation (P) at multiple temporal scales. For this purpose, we combine time-scale decomposition by means of a discrete wavelet transform with the concept of coupled climate network analysis. Our results demonstrate the potential of the proposed approach to unravel the scale-specific interdependences between atmosphere and ocean and, thus, shed light on the emerging multiscale processes inherent to the climate system, which traditionally remain undiscovered when investigating the system only at the native resolution of existing climate data sets. Moreover, we show how the relevant spatial interdependence structures between SST and P evolve across time-scales. Most notably, the strongest mutual correlations between SST and P at annual scale (8–16 months) concentrate mainly over the Pacific Ocean, while the corresponding spatial patterns progressively disappear when moving toward longer time-scales.
On-chip integrated photonic circuits based on two-dimensional materials and hexagonal boron nitride as the optical confinement layer
Authors: Ren Tianhua , Loh Kian Ping
Published: June 2019

Owing to the rapid development of data communication, there is a high demand for the large-scale integration of photonic devices into broadband communication networks. For practical integration, integrated photonic circuits are ideally fabricated on silicon platforms using processes compatible with complementary metal–oxide–semiconductor technology. Two-dimensional transition metal dichalcogenides are attractive candidates as on-chip emitters and absorbers due to their direct bandgaps, compatibility with miniaturization, large exciton binding energies, anisotropic polarizations, and strong light-matter interactions. Herein, a review of the current progress in the applications of two-dimensional materials as on-chip semiconductor devices is presented, as well as their prospects of integration on the silicon photonic platform. On-chip integrated photonic circuits are proposed based on heterostructures of hexagonal boron nitride and two-dimensional materials with functions of light sources, optical modulators, and photodetectors toward high-bandwidth optical interconnects.
Spatial disaggregation clarifies the inequity in distributional outcomes of household solar PV installation
Authors: Tidemann Carl , Engerer Nicholas , Markham Francis , Doran Bruce , Pezzey John C. V.
Published: June 2019

Global installations of household rooftop solar photovoltaics (PVs) are rapidly increasing, driven in many cases by government incentives. We show a direct correlation between economic resources and both the PV penetration and the average PV system size. Using datasets with a high areal resolution for socioeconomic indicators and household PV installations, we create an Index of Economic Resources for Owner-Occupiers for the Australian Capital Territory, Australia. Our analysis confirms the inaccuracy of using highly aggregated datasets in exploring the socioeconomic outcomes of the renewable energy policy, an inaccuracy long known in other disciplines. Analyses using such datasets are likely to overlook vulnerable areas, which could increase perverse policy outcomes.
High-temperature deep-level transient spectroscopy system for defect studies in wide-bandgap semiconductors
Authors: Majdi S. , Gabrysch M. , Suntornwipat N. , Burmeister F. , Jonsson R. , Kovi K. K. , Hallén A.
Published: June 2019

Full investigation of deep defect states and impurities in wide-bandgap materials by employing commercial transient capacitance spectroscopy is a challenge, demanding very high temperatures. Therefore, a high-temperature deep-level transient spectroscopy (HT-DLTS) system was developed for measurements up to 1100 K. The upper limit of the temperature range allows for the study of deep defects and trap centers in the bandgap, deeper than previously reported by DLTS characterization in any material. Performance of the system was tested by carrying out measurements on the well-known intrinsic defects in n-type 4H-SiC in the temperature range 300–950 K. Experimental observations performed on 4H-SiC Schottky diodes were in good agreement with the literature. However, the DLTS measurements were restricted by the operation and quality of the electrodes.
New simple analytical method for flow enhancement predictions of pulsatile flow of a structured fluid
Authors: Herrera-Valencia E. E. , Sanchez-Villavicencio M. L. , Medina-Torres L. , Ramirez D. M. Nuñez , Hernández-Abad Vicente Jesús , Calderas F. , Manero O.
Published: June 2019

In this work, a new simplified method to find the fluidity enhancement of a non-Newtonian liquid under a pulsating (time-dependent) pressure gradient is analyzed. The fluidity enhancement is predicted by means of a Taylor series expansion of the flow rate in the vicinity of the applied wall stress. This expansion is shown to render the same results as several perturbation techniques used at length in the literature. Both new and the conventional perturbation methods are equivalent in their predictions of the fluidity enhancement. Even though the flow and rheology behavior are modeled using the Bautista-Manero-Puig constitutive equation, it is shown that the prediction of the fluidity enhancement does not depend on the constitutive model employed, but a condition of shear thinning behavior of the fluid is necessary for it. Flow enhancement is predicted using rheological data for blood since this fluid naturally flows under a pulsatile pressure gradient. The flow enhancement equation is found to have a similar form as the equation of the Rabinowitsch formalism in fully developed Poiseuille flow. This simplified technique will help in saving machine time for numerical predictions in computational blood flow simulations.
Exchange-bias and exchange-spring coupling in manganite nanostructures
Authors: Yu J. Y. , Li P. , Xu J. R. , Huang K. , Zhang L. , Wang L.
Published: June 2019

Magnetic exchange bias (EB) is a common phenomenon in manganite nanosystems. However, the development of a general theory has been hampered by the uncertain nature of interfaces between different magnetic phases, commonly between an antiferromagnetic phase and a ferromagnetic or spin-glass phase. Here, a robust hard/soft magnetic phase coupling was observed in manganite Na0.44−δLiδMnO2 nanoribbons. A double-domain model with a hard/soft magnetic phase interaction associated with Li-ion doping is suggested to account for the EB effect. This observation is important not only for understanding the physical origin of EB in manganese oxide nanosystems but also for their application in spintronic devices.
New technique minimizes observers for determining sources of outbreaks
Authors: Bandari Anashe
Published: June 2019

Researchers have developed a new computational method for minimizing the number of observers necessary for determining the source of diffusion processes in cyber-physical systems.
Allan White and Polypyridines: Extending the Lanthanide(III) Complex Series
Authors: Cotton Simon A. , Harrowfield Jack M. , Semenova Lioubov I. , Skelton Brian W. , Sobolev Alexandre N. , White Allan H.
Published: June 2019

X-Ray structure determinations on 41 complexes of lanthanide(iii) halides, principally bromides, with 2,2′-bipyridine, 1,10-phenanthroline, and 2,2′:6′,2″-terpyridine provide a considerable extension to the earlier work of Allan White on such materials and a substantial extension of general work on polypyridine complexes of lanthanide halides. Complexes of 1:1, 1:2, and 2:4 metal-to-ligand composition have been characterised across a broad selection of the lanthanide elements, many of these species showing a higher overall ratio of ligand to lanthanide due to the incorporation of uncoordinated ligand within the crystal lattice. Although stacking of the aromatic entities is apparent in these adducts, in most instances H-bonding of unbound N to coordinated water appears to be the principal interaction involved in their formation.
Elevated CO2 causes large changes to morphology of perennial ryegrass (Lolium perenne)
Authors: Brinkhoff Rose , Porter Meagan , Hovenden Mark J.
Published: June 2019

Plant morphology and architecture are essential characteristics for all plants, but perhaps most importantly for agricultural species because economic traits are linked to simple features such as blade length and plant height. Key morphological traits likely respond to CO2 concentration ([CO2]), and the degree of this response could be influenced by water availability; however, this has received comparatively little research attention. This study aimed to determine the impacts of [CO2] on gross morphology of perennial ryegrass (Lolium perenne L.), the most widespread temperate pasture species, and whether these impacts are influenced by water availability. Perennial ryegrass cv. Base AR37 was grown in a well-fertilised FACE (free-air carbon dioxide enrichment) experiment in southern Tasmania. Plants were exposed to three CO2 concentrations (~400 (ambient), 475 and 550 µmol mol–1) at three watering-treatment levels (adequate, limited and excess). Shoot dry weight, height, total leaf area, leaf-blade separation, leaf size, relative water content and specific leaf area were determined, as well as shoot density per unit area as a measure of tillering. Plant morphology responded dramatically to elevated [CO2], plants being smaller with shorter leaf-blade separation lengths and smaller leaves than in ambient (control) plots. Elevated [CO2] increased tillering but did not substantially affect relative water content or specific leaf area. Water supply did not affect any measured trait or the response to elevated [CO2]. Observed impacts of elevated [CO2] on the morphology of a globally important forage crop could have profound implications for pasture productivity. The reductions in plant and leaf size were consistent across a range of soil-water availability, indicating that they are likely to be uniform. Elucidating the mechanisms driving these responses will be essential to improving predictability of these changes and may assist in breeding varieties suited to future conditions.
Watching the tide roll away – contested interpretations of the nature of the Lower Lakes of the Murray Darling Basin
Authors: Gell Peter A.
Published: June 2019

The Murray Darling Basin Plan (Murray Darling Basin Authority 2012) represents the largest investment by government in an Australian environmental management challenge and remains highly conflicted owing to the contested allocation of diminishing water resources. Central to the decision to reallocate consumptive water to environmental purposes in this Plan was the case made to maintain the freshwater character of two lakes at the terminus of the Murray Darling Basin, in South Australia. This freshwater state was identified as the natural condition on the basis of selected anecdotal evidence and was enshrined in the site’s listing under the Ramsar Convention. The commitment to the freshwater state was challenged under drought when sea water was seen as a means of averting acidification when low river flows risked the exposure of sulfidic sediments. Independent evidence from water quality indicators (diatoms) preserved in lake sediment records, however, attested to an estuarine, albeit variable, condition before the commissioning of near-mouth barrages in 1940. This interpretation for a naturally estuarine history, published after peer review, was overlooked in a report to the South Australian government, which argued, without the provision of new evidence from the lakes, that they were fresh for their entire history. This revised interpretation is widely cited in the scientific literature, government reports and online discussion and underpins a watering strategy aimed at a freshwater future for the Lower Lakes. The allocation of large volumes of fresh water to achieve this condition presents significant difficulties owing to the highly contested nature of water use across the Basin.