bluuebunny/crossref_metadata_2025 huggingface dataset:
Industrial-Graded Epoxy Nanocomposites with Mechanically Dispersed Multi-Walled Carbon Nanotubes: Static and Damping Properties
Authors: Giovannelli Andrea , Di Maio Dario , Scarpa Fabrizio
Published: October 2017

The majority of currently published dispersion protocols of carbon nanotubes rely on techniques that are not scalable to an industrial level. This work shows how to obtain polymer nanocomposites with good mechanical characteristics using multi-walled carbon nanotubes epoxy resins obtained by mechanical mixing only. The mechanical dispersion method illustrated in this work is easily scalable to industrial level. The high shearing force due to the complex field of motion produces a good and reproducible carbon nanotube dispersion. We have tested an industrial epoxy matrix with good baseline mechanical characteristics at different carbon nanotube weight loads. ASTM-derived tensile and compressive tests show an increment in both Young’s modulus and compressive strength compared with the pristine resin from a starting low wt %. Comparative vibration tests show improvement in the damping capacity. The new carbon nanotube enhanced epoxy resin has superior mechanical proprieties compared to the market average competitor, and is among the top products in the bi-components epoxy resins market. The new dispersion method shows significant potential for the industrial use of CNTs in epoxy matrices.
Ni(II) Complexes with Schiff Base Ligands: Preparation, Characterization, DNA/Protein Interaction and Cytotoxicity Studies
Authors: Yu Hui , Zhang Wei , Yu Qing , Huang Fu-Ping , Bian He-Dong , Liang Hong
Published: October 2017

In this study, two Ni(II) complexes, namely [Ni(HL1)2(OAc)2] (1) and [Ni(L2)2] (2) (where HL1 and HL2 are (E)-1-((1-(2-hydroxyethyl)-1H-pyrazol-5-ylimino)methyl)-naphthalen-2-ol) and (E)-ethyl-5-((2-hydroxynaphthalen-1-yl)methyleneamino)-1-methyl-1H-pyrazole-4-carboxylate, respectively), were synthesized and characterized by X-ray crystallography, Electrospray Ionization Mass Spectrometry (ESI-MS), elemental analysis, and IR. Their uptake in biological macromolecules and cancer cells were preliminarily investigated through electronic absorption (UV-Vis), circular dichroism (CD) and fluorescence quenching measurements. Bovine serum albumin (BSA) interaction experiments were investigated by spectroscopy which showed that the complexes and ligands could quench the intrinsic fluorescence of BSA through an obvious static quenching process. The spectroscopic studies indicated that these complexes could bind to DNA via groove, non-covalent, and electrostatic interactions. Furthermore, in vitro methyl thiazolyl tetrazolium (MTT) assays and Annexin V/PI flow cytometry experiments were performed to assess the antitumor capacity of the complexes against eight cell lines. The results show that both of the complexes possess reasonable cytotoxicities.
Equol, a Clinically Important Metabolite, Inhibits the Development and Pathogenicity of Magnaporthe oryzae, the Causal Agent of Rice Blast Disease
Authors: Wang Jiaoyu , Li Ling , Yin Yeshi , Gu Zhuokan , Chai Rongyao , Wang Yanli , Sun Guochang
Published: October 2017

Equol, a metabolite of soybean isoflavone daidzein, has been proven to have various bioactivities related to human health, but little is known on its antifungal activity to plant fungal pathogens. Magnaporthe oryzae is a phytopathogenic fungus that causes rice blast, a devastating disease on rice. Here, we demonstrated that equol influences the development and pathogenicity of M. oryzae. Equol showed a significant inhibition to the mycelial growth, conidial generation and germination, and appressorial formation of M. oryzae. As a result, equol greatly reduced the virulence of M. oryzae on rice and barley leaves. The antifungal activity of equol was also found in several other plant fungal pathogens. These findings expand our knowledge on the bioactivities of equol.
Flavonoid Naringenin Attenuates Oxidative Stress, Apoptosis and Improves Neurotrophic Effects in the Diabetic Rat Retina
Authors: Al-Dosari Dalia , Ahmed Mohammed , Al-Rejaie Salim , Alhomida Abdullah , Ola Mohammad
Published: October 2017

Diabetic retinopathy (DR) is one of the leading causes of decreased vision and blindness worldwide. Diabetes-induced oxidative stress is believed to be the key factor that initiates neuronal damage in the diabetic retina leading to DR. Experimental approaches to utilize dietary flavonoids, which possess both antidiabetic and antioxidant activities, might protect the retinal damage in diabetes. The aim of this study was to investigate the potential protective effects of naringenin in the retina of streptozotocin-induced diabetic rats. Diabetic rats were orally treated and untreated with naringenin (50 mg/kg/day) for five weeks and retinas were analyzed for markers of oxidative stress, apoptosis and neurotrophic factors. Systemic effects of naringenin treatments were also analyzed and compared with untreated groups. The results showed that elevated levels of thiobarbituric acid reactive substances (TBARs) and decreased level of glutathione (GSH) in diabetic rats were ameliorated with naringenin treatments. Moreover, decreased levels of neuroprotective factors (Brain derived neurotrophic factor (BDNF)), tropomyosin related kinase B (TrkB) and synaptophysin in diabetic retina were augmented with naringenin treatments. In addition, naringenin treatment ameliorated the levels of apoptosis regulatory proteins; B cell lymphoma 2 (Bcl-2), Bcl-2 associated X protein (Bax) and caspase-3 in the diabetic retina. Thus, the study demonstrates the beneficial effects of naringenin that possesses anti-diabetic, antioxidant and antiapoptotic properties, which may limit neurodegeneration by providing neurotrophic support to prevent retinal damage in diabetic retinopathy.
Effect of Altering Dietary n-6:n-3 Polyunsaturated Fatty Acid Ratio with Plant and Marine-Based Supplement on Biomarkers of Bone Turnover in Healthy Adults
Authors: Rajaram Sujatha , Yip Ellen , Reghunathan Rajneesh , Mohan Subburaman , Sabaté Joan
Published: October 2017

Although there is accumulating evidence for a protective role of n-3 polyunsaturated fatty acids (n-3 PUFAs) on bone health, there are limited studies that examine the effect of altering dietary n-6:n-3 PUFA ratio with plant and marine sources of n-3 PUFA on bone health. Healthy adults (n = 24) were randomized into an eight-week crossover study with a four-week washout between treatments, with each subject consuming three of four diets. The four diets differed in the dietary n-6:n-3 PUFA ratios and either had an algal oil supplement added or not: (Control diet (10:1); α-linolenic acid (ALA) diet (2:1); Eicosapentaenoic acid/Docosahexaenoic acid (EPA/DHA) diet (10:1 plus supplement (S) containing EPA/DHA; Combination diet (2:1 + S)). The supplement was microalgae oil that provided 1 g EPA + DHA/day. Flaxseed oil and walnuts provided 8.6 g of ALA/day in the 2:1 diets. Serum levels of c-telopeptide (CTX), procollagen Type I N-terminal peptide, and osteocalcin showed significant correlation with age but none of the bone markers or peroxisomal proliferator-activated receptor-γ mRNA expression was significantly different between the diets. Serum CTX was negatively associated with red blood cell membrane linoleic acid and ALA and positively associated with membrane DHA. Neither altering dietary n-6:n-3 PUFA ratio from a 10:1 to a 2:1 ratio nor adding EPA/DHA supplement significantly changed bone turnover in the short term in healthy adults.
Novel Single-Shot Diagnostics for Electrons from Laser-Plasma Interaction at SPARC_LAB
Authors: Bisesto Fabrizio , Anania Maria , Botton Mordechai , Chiadroni Enrica , Cianchi Alessandro , Curcio Alessandro , Ferrario Massimo , Galletti Mario , Pompili Riccardo , Schleifer Elad , Zigler Arie
Published: October 2017

Nowadays, plasma wakefield acceleration is the most promising acceleration technique for compact and cheap accelerators, needed in several fields, e.g., novel compact light sources for industrial and medical applications. Indeed, the high electric field available in plasma structures (>100 GV/m) allows for accelerating electrons at the GeV energy scale in a few centimeters. Nevertheless, this approach still suffers from shot-to-shot instabilities, mostly related to experimental parameter fluctuations, e.g., laser intensity and plasma density. Therefore, single shot diagnostics are crucial in order to properly understand the acceleration mechanism. In this regard, at the SPARC_LAB Test Facility, we have developed two diagnostic tools to investigate properties of electrons coming from high intensity laser–matter interaction: one relying on Electro Optical Sampling (EOS) for the measurement of the temporal profile of the electric field carried by fast electrons generated by a high intensity laser hitting a solid target, the other one based on Optical Transition Radiation (OTR) for single shot measurements of the transverse emittance. In this work, the basic principles of both diagnostics will be presented as well as the experimental results achieved by means of the SPARC high brightness photo-injector and the high power laser FLAME.
Primary Copper Smelter and Refinery as a Recycling Plant—A System Integrated Approach to Estimate Secondary Raw Material Tolerance
Authors: Forsén Olof , Aromaa Jari , Lundström Mari
Published: October 2017

The primary production of sulfide concentrates includes smelting to copper matte or blister copper, conversion of matte to blister copper, and refining to copper. Smelting, converting, and fire-refining can use a limited amount of secondary materials. Molten copper can effectively dissolve many metals, from valuable noble metals to harmful impurities such as bismuth. However, some of the impurity metals in copper are valuable in other applications. In this paper, we outline the main material flows in copper smelting and electrorefining and describe how minor metals can be recovered from secondary raw materials using copper as a carrier material. We will use a system integrated approach to define the factors that affect the recovery of different metals and copper quality. Metals typical in copper production are used as examples, like noble metals, As, Bi, Se, and Te, including metals in the EU critical raw materials list like PGM and Sb.
Chronotropic Competence Indices Extracted from Wearable Sensors for Cardiovascular Diseases Management
Authors: Wu Jiankang , Li Jianan , Seely Andrew , Zhu Yi , Huang Sisi , Wang Xiaoqin , Zhao Lei , Wang Hongliang , Christophe Herry
Published: October 2017

Chronotropic incompetence (CI) has been proven to be an important factor in the diagnosis and management of cardiovascular diseases. In this paper, we extend the existing CI parameters and propose chronotropic competence indices (CCI) to describe the exercise response of the cardiopulmonary system. A cardiac chronotropic competence Test (3CT), dedicated to CCI measurement using a wearable device, is also presented. Preliminary clinical trials are presented for the validation of 3CT measurement accuracy, and to show the potential of CCI in the prevention and rehabilitation of cardiovascular diseases.
Effects of a Six-Week Strength Training Programme on Change of Direction Performance in Youth Team Sport Athletes
Authors: Bourgeois Frank , Gamble Paul , Gill Nic , McGuigan Mike
Published: October 2017

This study investigated the effects of eccentric phase-emphasis strength training (EPE) on unilateral strength and performance in 180- and 45-degree change of direction (COD) tasks in rugby union players. A 12-week cross-over design was used to compare the efficacy of resistance training executed with 3 s eccentric duration (EPE, n = 12) against conventional strength training, with no constraints on tempo (CON, n = 6). Players in each condition were categorised as ‘fast’ (FAST) or ‘slow’ (SLOW) using median trial times from baseline testing. Players recorded greater isometric strength improvements following EPE (ES = −0.54 to 1.80). Whilst these changes were not immediate, players improved in strength following cessation. Improvements in 180-degree COD performance was recorded at all test-points following EPE (ES = −1.32 to −0.15). Improvements in 45-degree COD performance were apparent for FAST following CON (ES = −0.96 to 0.10), but CON was deleterious for SLOW (ES = −0.60 to 1.53). Eccentric phase-emphasis strength training shows potential for sustained strength enhancement. Positive performance changes in COD tasks were category- and condition-specific. The data indicate the greatest improvement occurred at nine weeks following resistance training in these players. Performance benefits may also be specific to COD task, player category, and relative to emphasis on eccentric phase activity.
A Comparative Study of Green Purchase Intention between Korean and Chinese Consumers: The Moderating Role of Collectivism
Authors: Lee You Kyung
Published: October 2017

This study aims to examine the impacts of the new ecological paradigm, environmental collective efficacy, environmental knowledge, and collectivism on the green purchase intention of Korean and Chinese consumers. Although some studies have researched the relationship between cultural influences and green purchase behaviour, a study on the moderating effect of collectivism on the formation of green purchase intention is rarely found. Therefore, based on 357 consumers in Korea and 398 consumers in China, this study proposes a new model of green purchase intention and empirically tests a model using moderated regression analysis (MRA). The results show that the new ecological paradigm, environmental collective efficacy, environmental knowledge, and collectivism are direct antecedents of green purchase intention in China. In particular, collectivism positively moderates the relationship between environmental collective efficacy and green purchase intention in China. However, the results from Korean consumers show that collectivism has neither a direct impact nor moderating impact on green purchase intention. However, it was found that environmental collective efficacy and environmental knowledge have direct impacts on green purchase intention in Korea. Finally, this study discusses the theoretical and managerial implications of these findings.
Data-Driven Study of Discolouration Material Mobilisation in Trunk Mains
Authors: Meyers Gregory , Kapelan Zoran , Keedwell Edward
Published: October 2017

It has been shown that sufficiently high velocities can cause the mobilisation of discolouration material in water distribution systems. However, how much typical hydraulic conditions affect the mobilisation of discolouration material has yet to be thoroughly investigated. In this paper, results are presented from real turbidity and flow observations collected from three U.K. trunk main networks over a period of two years and 11 months. A methodology is presented that determines whether discolouration material has been mobilised by hydraulic forces and the origin of that material. The methodology found that the majority of turbidity observations over 1 Nephelometric Turbidity Units (NTU) could be linked to a preceding hydraulic force that exceeded an upstream pipe’s hydraulically preconditioned state. The findings presented in this paper show the potential in proactively managing the hydraulic profile to reduce discolouration risk and improve customer service.
The Impact of a Check Dam on Groundwater Recharge and Sedimentation in an Ephemeral Stream
Authors: Djuma Hakan , Bruggeman Adriana , Camera Corrado , Eliades Marinos , Kostarelos Konstantinos
Published: October 2017

Despite the widespread presence of groundwater recharge check dams, there are few studies that quantify their functionality. The objectives of this study are (i) to assess groundwater recharge in an ephemeral river with and without a check dam and (ii) to assess sediment build-up in the check-dam reservoir. Field campaigns were carried out to measure water flow, water depth, and check-dam topography to establish water volume, evaporation, outflow, and recharge relations, as well as sediment build-up. To quantify the groundwater recharge, a water-balance approach was applied at two locations: at the check dam reservoir area and at an 11 km long natural stretch of the river upstream. Prediction intervals were computed to assess the uncertainties of the results. During the four years of operation, the check dam (storage capacity of 25,000 m3) recharged the aquifer with an average of 3.1 million m3 of the 10.4 million m3 year−1 of streamflow (30%). The lower and upper uncertainty limits of the check dam recharge were 0.1 and 9.6 million m3 year−1, respectively. Recharge from the upstream stretch was 1.5 million m3 year−1. These results indicate that check dams are valuable structures for increasing groundwater resources in semi-arid regions.
Assessing the Water-Resources Potential of Istanbul by Using a Soil and Water Assessment Tool (SWAT) Hydrological Model
Authors: Cuceloglu Gokhan , Abbaspour Karim , Ozturk Izzet
Published: October 2017

Uncertainties due to climate change and population growth have created a critical situation for many megacities. Investigating spatio-temporal variability of water resources is, therefore, a critical initial step for water-resource management. This paper is a first study on the evaluation of water-budget components of water resources in Istanbul using a high-resolution hydrological model. In this work, the water resources of Istanbul and surrounding watersheds were modeled using the Soil and Water Assessment Tool (SWAT), which is a continuous-time, semi-distributed, process-based model. The SWAT-CUP program was used for calibration/validation of the model with uncertainty analysis using the SUFI-2 algorithm over the period 1977–2013 at 25 gauge stations. The results reveal that the annual blue-water potential of Istanbul is 3.5 billion m3, whereas the green-water flow and storage are 2.9 billion m3 and 0.7 billion m3, respectively. Watersheds located on the Asian side of the Istanbul megacity yield more blue-water resources compared to the European side, and constitute 75% of the total potential water resources. The model highlights the water potential of the city under current circumstances and gives an insight into its spatial distribution over the region. This study provides a strong basis for forthcoming studies concerning better water-resources management practices, climate change and water-quality studies, as well as other socio-economic scenario analyses in the region.
Land Use, Climate, and Water Resources—Global Stages of Interaction
Authors: Kaushal Sujay , Gold Arthur , Mayer Paul
Published: October 2017

Land use and climate change can accelerate the depletion of freshwater resources that support humans and ecosystem services on a global scale. Here, we briefly review studies from around the world, and highlight those in this special issue. We identify stages that characterize increasing interaction between land use and climate change. During the first stage, hydrologic modifications and the built environment amplify overland flow via processes associated with runoff-dominated ecosystems (e.g., soil compaction, impervious surface cover, drainage, and channelization). During the second stage, changes in water storage impact the capacity of ecosystems to buffer extremes in water quantity and quality (e.g., either losses in snowpack, wetlands, and groundwater recharge or gains in water and nutrient storage behind dams in reservoirs). During the third stage, extremes in water quantity and quality contribute to losses in ecosystem services and water security (e.g., clean drinking water, flood mitigation, and habitat availability). During the final stage, management and restoration strategies attempt to regain lost ecosystem structure, function, and services but need to adapt to climate change. By anticipating the increasing interaction between land use and climate change, intervention points can be identified, and management strategies can be adjusted to improve outcomes for realistic expectations. Overall, global water security cannot be adequately restored without considering an increasing interaction between land use and climate change across progressive stages and our ever-increasing human domination of the water cycle from degradation to ecosystem restoration.
Karyotypic variation and pollen stainability in resynthesized allopolyploids Tragopogon miscellus and T. mirus
Authors: Spoelhof Jonathan P. , Chester Michael , Rodriguez Roseana , Geraci Blake , Heo Kweon , Mavrodiev Evgeny , Soltis Pamela S. , Soltis Douglas E.
Published: October 2017

PREMISE OF THE STUDY:

Polyploidy has extensively shaped the evolution of plants, but the early stages of polyploidy are still poorly understood. The neoallopolyploid species Tragopogon mirus and T. miscellus are both characterized by widespread karyotypic variation, including frequent aneuploidy and intergenomic translocations. Our study illuminates the origins and early impacts of this variation by addressing two questions: How quickly does karyotypic variation accumulate in Tragopogon allopolyploids following whole‐genome duplication (WGD), and how does the fertility of resynthesized Tragopogon allopolyploids evolve shortly after WGD?

METHODS:

We used genomic in situ hybridization and lactophenol‐cotton blue staining to estimate the karyotypic variation and pollen stainability, respectively, of resynthesized T. mirus and T. miscellus during the first five generations after WGD.

KEY RESULTS:

Widespread karyotypic variation developed quickly in synthetics and resembled that of naturally occurring T. mirus and T. miscellus by generation S4. Pollen stainability in resynthesized allopolyploids was consistently lower than that of natural T. mirus and T. miscellus, as well as their respective diploid progenitor species. Logistic regression showed that mean pollen stainability increased slightly over four generations in resynthesized T. mirus but remained at equivalent levels in T. miscellus.

CONCLUSIONS:

Our results clarify some of the changes that occur in T. mirus and T. miscellus immediately following their origin, most notably the rapid onset of karyotypic variation within these species immediately following WGD.
Complete chloroplast genome sequences contribute to plant species delimitation: A case study of the Anemopaegma species complex
Authors: Firetti Fabiana , Zuntini Alexandre Rizzo , Gaiarsa Jonas Weismann , Oliveira Renata Souza , Lohmann Lúcia G. , Van Sluys Marie‐Anne
Published: October 2017

PREMISE OF THE STUDY:

Bignoniaceae is an important component of neotropical forests and a model for evolutionary and biogeographical studies. A previous combination of molecular markers and morphological traits improved the phylogeny of the group. Here we demonstrate the value of next‐generation sequencing (NGS) to assemble the chloroplast genome of eight Anemopaegma species and solve taxonomic problems.

METHODS:

Three NGS platforms were used to sequence total DNA of Anemopaegma species. After genome assembly and annotation, we compared chloroplast genomes within Anemopaegma, with other Lamiales species, and the evolutionary rates of protein‐coding genes using Tanaecium tetragonolobum as the outgroup. Phylogenetic analyses of Anemopaegma with different data sets were performed.

KEY RESULTS:

Chloroplast genomes of Anemopaegma species ranged from 167,413 bp in A. foetidum to 168,987 bp in A. acutifolium (“typical” form). They exhibited a characteristic quadripartite structure with a large single‐copy region (75,070−75,761 bp), a small single‐copy region (12,766−12,817 bp) and a pair of inverted repeat regions (IRs) (39,480−40,481) encoding an identical set of 112 genes. An inversion of a fragment with ca. 8 kb, located in the IRs and containing the genes trnI‐AAU, ycf2, and trnL‐CAA, was observed in these chloroplast genomes when compared with those of other Lamiales.

CONCLUSIONS:

Anemopaegma species have the largest genomes within the Lamiales possibly due to the large amount of repetitive sequences and IR expansion. Variation was higher in coding regions than in noncoding regions, and some genes were identified as markers for differentiation between species. The use of the entire chloroplast genome gave better phylogenetic resolution of the taxonomic groups. We found that two forms of A. acutifolium result from different maternal lineages.
Insights from Synthetic Star-forming Regions. II. Verifying Dust Surface Density, Dust Temperature, and Gas Mass Measurements With Modified Blackbody Fitting
Authors: Koepferl Christine M. , Robitaille Thomas P. , Dale James E.
Published: October 2017

We use a large data set of realistic synthetic observations (produced in Paper I of this series) to assess how observational techniques affect the measurement physical properties of star-forming regions. In this part of the series (Paper II), we explore the reliability of the measured total gas mass, dust surface density and dust temperature maps derived from modified blackbody fitting of synthetic Herschel observations. We find from our pixel-by-pixel analysis of the measured dust surface density and dust temperature a worrisome error spread especially close to star formation sites and low-density regions, where for those “contaminated” pixels the surface densities can be under/overestimated by up to three orders of magnitude. In light of this, we recommend to treat the pixel-based results from this technique with caution in regions with active star formation. In regions of high background typical in the inner Galactic plane, we are not able to recover reliable surface density maps of individual synthetic regions, since low-mass regions are lost in the far-infrared background. When measuring the total gas mass of regions in moderate background, we find that modified blackbody fitting works well (absolute error: + 9%; −13%) up to 10 kpc distance (errors increase with distance). Commonly, the initial images are convolved to the largest common beam-size, which smears contaminated pixels over large areas. The resulting information loss makes this commonly used technique less verifiable as now χ
2 values cannot be used as a quality indicator of a fitted pixel. Our control measurements of the total gas mass (without the step of convolution to the largest common beam size) produce similar results (absolute error: +20%; −7%) while having much lower median errors especially for the high-mass stellar feedback phase. In upcoming papers (Paper III; Paper IV) of this series we test the reliability of measured star formation rate with direct and indirect techniques.
Chemical Mapping of the Milky Way with The Canada–France Imaging Survey: A Non-parametric Metallicity–Distance Decomposition of the Galaxy
Authors: Ibata Rodrigo A. , McConnachie Alan , Cuillandre Jean-Charles , Fantin Nicholas , Haywood Misha , Martin Nicolas F. , Bergeron Pierre , Beckmann Volker , Bernard Edouard , Bonifacio Piercarlo , Caffau Elisabetta , Carlberg Raymond , Côté Patrick , Cabanac Rémi , Chapman Scott , Duc Pierre-Alain , Durret Florence , Famaey Benoît , Fabbro Sébastien , Gwyn Stephen , Hammer Francois , Hill Vanessa , Hudson Michael J. , Lançon Ariane , Lewis Geraint , Malhan Khyati , Matteo Paola di , McCracken Henry , Mei Simona , Mellier Yannick , Navarro Julio , Pires Sandrine , Pritchet Chris , Reylé Celine , Richer Harvey , Robin Annie C. , Jannsen Rubén Sánchez , Sawicki Marcin , Scott Douglas , Scottez Vivien , Spekkens Kristine , Starkenburg Else , Thomas Guillaume , Venn Kim
Published: October 2017

We present the chemical distribution of the Milky Way, based on 2900

of u-band photometry taken as part of the Canada–France Imaging Survey. When complete, this survey will cover 10,000

of the northern sky. By combing the CFHT u-band photometry together with Sloan Digital Sky Survey and Pan-STARRS

and i, we demonstrate that we are able to reliably measure the metallicities of individual stars to ∼0.2 dex, and hence additionally obtain good photometric distance estimates. This survey thus permits the measurement of metallicities and distances of the dominant main-sequence (MS) population out to approximately

, and provides a much higher number of stars at large extraplanar distances than have been available from previous surveys. We develop a non-parametric distance–metallicity decomposition algorithm and apply it to the sky at

and to the North Galactic Cap. We find that the metallicity–distance distribution is well-represented by three populations whose metallicity distributions do not vary significantly with vertical height above the disk. As traced in MS stars, the stellar halo component shows a vertical density profile that is close to exponential, with a scale height of around

. This may indicate that the inner halo was formed partly from disk stars ejected in an ancient minor merger.
A New Stellar Outburst Associated with the Magnetic Activities of the K-type Dwarf in a White Dwarf Binary
Authors: Qian S.-B. , Han Z.-T. , Zhang B. , Zejda M. , Michel R. , Zhu L.-Y. , Zhao E.-G. , Liao W.-P. , Tian X.-M. , Wang Z.-H.
Published: October 2017

1SWASP J162117.36+441254.2 was originally classified as an EW-type binary with a period of 0.20785 days. However, it was detected to have undergone a stellar outburst on 2016 June 3. Although the system was later classified as a cataclysmic variable (CV) and the event was attributed as a dwarf nova outburst, the physical reason is still unknown. This binary has been monitored photometrically since 2016 April 19, and many light curves were obtained before, during, and after the outburst. Those light and color curves observed before the outburst indicate that the system is a special CV. The white dwarf is not accreting material from the secondary and there are no accretion disks surrounding the white dwarf. By comparing the light curves obtained from 2016 April 19 to those from September 14, it was found that magnetic activity of the secondary is associated with the outburst. We show strong evidence that the L
1 region on the secondary was heavily spotted before and after the outburst and thus quench the mass transfer, while the outburst is produced by a sudden mass accretion of the white dwarf. These results suggest that J162117 is a good astrophysical laboratory to study stellar magnetic activity and its influences on CV mass transfer and mass accretion.
An X-Ray Periodicity of ∼1.8 hr in Narrow-line Seyfert 1 Galaxy Mrk 766
Authors: Zhang Peng , Zhang Peng-fei , Yan Jing-zhi , Fan Yi-zhong , Liu Qing-zhong
Published: October 2017

In the narrow-line Seyfert 1 galaxy Mrk 766, a quasi-periodic oscillation (QPO) signal with a period of ∼6450 s is detected in the XMM-Newton data collected on 2005 May 31. This QPO signal is highly statistically significant at the ∼5σ confidence level, with a quality factor of

Q
=
f

/

Δ
f
>
13.6

. The X-ray intensity changed by a factor of 3, with a root mean square fractional variability of 14.3%. Furthermore, this QPO signal is present in the data of all three EPIC detectors and two RGS cameras and its frequency follows the

f

QPO

–

M

BH

relation spanning from stellar-mass to supermassive black holes. Interestingly, a possible QPO signal with a period of ∼4200 s had been reported in the literature. The frequency ratio of these two QPO signals is ∼3:2. Our result is also in support of the hypothesis that the QPO signals can just be transient. The spectral analysis reveals that the contribution of the soft excess component below ∼1 keV is different between epochs with and without QPO. This property, as well as the former frequency ratio, are well-detected in X-ray BH binaries, which may shed some light on the physical origins of our event.
Post-main-sequence Evolution of Icy Minor Planets. III. Water Retention in Dwarf Planets and Exomoons and Implications for White Dwarf Pollution
Authors: Malamud Uri , Perets Hagai B.
Published: October 2017

Studies suggest that the pollution of white dwarf (WD) atmospheres arises from the accretion of minor planets, but the exact properties of polluting material, and in particular the evidence for water in some cases are not yet understood. Several previous works studied the possibility of water surviving inside minor planets around evolving stars. However, they all focused on small, comet-sized to moonlet-sized minor planets, when the inferred mass inside the convection zones of He-dominated WDs could actually be compatible with much more massive minor planets. Here we explore for the first time, the water retention inside exoplanetary dwarf planets, or moderate-sized moons, with radii of the order of hundreds of kilometers. This paper concludes a series of papers that has now covered nearly the entire potential mass range of minor planets, in addition to the full mass range of their host stars. We find that water retention is (a) affected by the mass of the WD progenitor, and (b) it is on average at least 5%, irrespective of the assumed initial water composition, if it came from a single accretion event of an icy dwarf planet or moon. The latter prediction strengthens the possibility of habitability in WD planetary systems, and it may also be used in order to distinguish between pollution originating from multiple small accretion events and singular large accretion events. To conclude our work, we provide a code that calculates ice and water retention by interpolation and may be freely used as a service to the community.
GASP. III. JO36: A Case of Multiple Environmental Effects at Play?
Authors: Fritz Jacopo , Moretti Alessia , Gullieuszik Marco , Poggianti Bianca , Bruzual Gustavo , Vulcani Benedetta , Nicastro Fabrizio , Jaffé Yara , Cervantes Sodi Bernardo , Bettoni Daniela , Biviano Andrea , Fasano Giovanni , Charlot Stéphane , Bellhouse Callum , Hau George
Published: October 2017

The so-called jellyfish galaxies are objects exhibiting disturbed morphology, mostly in the form of tails of gas stripped from the main body of the galaxy. Several works have strongly suggested ram pressure stripping to be the mechanism driving this phenomenon. Here, we focus on one of these objects, drawn from a sample of optically selected jellyfish galaxies, and use it to validate sinopsis, the spectral fitting code that will be used for the analysis of the GASP (GAs Stripping Phenomena in galaxies with MUSE) survey, and study the spatial distribution and physical properties of the gas and stellar populations in this galaxy. We compare the model spectra to those obtained with gandalf, a code with similar features widely used to interpret the kinematics of stars and gas in galaxies from IFU data. We find that sinopsis can reproduce the pixel-by-pixel spectra of this galaxy at least as well as gandalf does, providing reliable estimates of the underlying stellar absorption to properly correct the nebular gas emission. Using these results, we find strong evidences of a double effect of ram pressure exerted by the intracluster medium onto the gas of the galaxy. A moderate burst of star formation, dating between 20 and 500 Myr ago and involving the outer parts of the galaxy more strongly than the inner regions, was likely induced by a first interaction of the galaxy with the intracluster medium. Stripping by ram pressure, plus probable gas depletion due to star formation, contributed to create a truncated ionized gas disk. The presence of an extended stellar tail on only one side of the disk points instead to another kind of process, likely gravitational interaction by a fly-by or a close encounter with another galaxy in the cluster.
Near L-edge Single and Multiple Photoionization of Singly Charged Iron Ions
Authors: Schippers Stefan , Martins Michael , Beerwerth Randolf , Bari Sadia , Holste Kristof , Schubert Kaja , Viefhaus Jens , Savin Daniel Wolf , Fritzsche Stephan , Müller Alfred
Published: October 2017

Absolute cross-sections for m-fold photoionization (

m
=
1
,

…
,

6

) of Fe+ by a single photon were measured employing the photon–ion merged-beams setup PIPE at the PETRA III synchrotron light source, operated by DESY in Hamburg, Germany. Photon energies were in the range 680–920 eV, which covers the photoionization resonances associated with

2
p

and

2
s

excitation to higher atomic shells as well as the thresholds for

2
p

and

2
s

ionization. The corresponding resonance positions were measured with an uncertainty of ±0.2 eV. The cross-section for Fe+ photoabsorption is derived as the sum of the individually measured cross-sections for m-fold ionization. Calculations of the Fe+ absorption cross-sections were carried out using two different theoretical approaches, Hartree–Fock including relativistic extensions and fully relativistic multiconfiguration Dirac–Fock. Apart from overall energy shifts of up to about 3 eV, the theoretical cross-sections are in good agreement with each other and with the experimental results. In addition, the complex de-excitation cascades after the creation of inner-shell holes in the Fe+ ion were tracked on the atomic fine-structure level. The corresponding theoretical results for the product charge-state distributions are in much better agreement with the experimental data than previously published configuration-average results. The present experimental and theoretical results are valuable for opacity calculations and are expected to pave the way to a more accurate determination of the iron abundance in the interstellar medium.
Evidence for Higher Black Hole Spin in Radio-loud Quasars
Authors: Schulze Andreas , Done Chris , Lu Youjun , Zhang Fupeng , Inoue Yoshiyuki
Published: October 2017

One of the major unsolved questions concerning the understanding of the active galactic nucleus population is the origin of the dichotomy between radio-quiet and radio-loud quasars. The most promising explanation is provided by the spin paradigm, which suggests that radio-loud quasars have a higher black hole spin. However, the measurement of black hole spin remains extremely challenging. We here aim at comparing the mean radiative efficiencies of carefully matched samples of radio-loud and radio-quiet Sloan Digital Sky Survey (SDSS) quasars at

0.3
<
z
<
0.8

. We use the [O iii] luminosity as an indirect average tracer of the ionizing continuum in the extreme-UV regime where the differences in the spectral energy distribution (SED) due to black hole spin are most pronounced. We find that the radio-loud sample shows an enhancement in [O iii] line strength by a factor of at least 1.5 compared to a radio-quiet sample matched in redshift, black hole mass, and optical continuum luminosity or accretion rate. We argue that this enhancement is caused by differences in the SED, suggesting higher average bolometric luminosities at fixed accretion rate in the radio-loud population. This suggests that the radio-loud quasar population has on average systematically higher radiative efficiencies and therefore higher black hole spin than the radio-quiet population, providing observational support for the black hole spin paradigm.
Corrigendum to «Contrasting morphology with molecular data: an approach to revision of species complexes based on the example of European (Cyprinidae)» by Palandačić et al. 2017
Authors: Palandacic Anja , Naseka Alexander , Ramler David , Ahnelt Harald
Published: October 2017

This corrigendum, in the sense of the Glossary of the International Code of Zoological Nomenclature (ICZN 1999, p. 102), is to ensure that the ICZN criteria for the availability of the two new nomenclatural acts, namely the designations of the neotype of Phoxinus csikii Hankó, 1922 and the lectotype of Phoxinus marsilii Heckel, 1836, are satisfied.
L’émergence et l’opérationnalisation d’une logique d’action responsable chez les dirigeants de petites et moyennes entreprises
Authors: Da Fonseca Marie , Bonneveux Élise
Published: October 2017

Cette recherche propose de s’interroger sur la relation entre la vision et la représentation du dirigeant de petite et moyenne entreprise (PME) et l’émergence d’une logique d’action responsable. En effet, les PME constituent le cœur du tissu économique français et sont de plus en plus sollicitées pour adopter des pratiques et stratégies responsables. Pour caractériser la vision, nous distinguons deux approches : l’une instrumentale et l’autre cognitive (Gond et Igalens, 2016). La représentation de la RSE est analysée selon trois aspects : la perception d’une dimension stratégique ou non, la projection à court ou à long terme, et la conception de la RSE, soit globale, soit opposant l’économique au social et à l’environnemental. Les logiques d’action responsable sont appréhendées dans la lignée des travaux de Rooke et Torbert (2005) puis de Boiral, Cayer et Baron (2009) et Boiral, Baron et Gunnlaugsin (2014) qui en ont proposé une typologie. L’étude des logiques d’action responsable dans six cas de PME nous a permis d’établir une typologie de trois profils de dirigeants et de les relier aux actions mises en œuvre.
Opérationnalisation du développement durable et action collective : étude d’un cas de promotion immobilière
Authors: Komi Abdoul Karim , Maillefert Muriel
Published: October 2017

Au fil des années, de nouvelles normes ont été développées pour réguler le monde de la construction. Elles s’inscrivent dans une logique d’opérationnalisation du développement durable (DD) que nous cherchons à comprendre à travers l’analyse des représentations des parties prenantes d’une promotion immobilière privée et en nous appuyant sur une approche par l’action collective. Elle vise à comprendre la manière dont l’action se structure et se justifie. Dans un premier temps, nous proposons une caractérisation de cette action fondée sur l’intérêt qui la porte et permettant de différencier et d’expliciter les représentations. Au-delà de cette détermination structurante de l’action, d’autres variables sont mobilisées : la nature/taille du groupe, la dimension socio-spatiale, l’horizon temporel, le principe, le processus et le résultat de l’action. Une grille d’analyse est ainsi définie pour procéder à une étude de cas. Le matériau empirique est collecté par entretiens semi-directifs et analysé qualitativement et quantitativement à l’aide du logiciel Alceste. Trois univers d’action idéaux-typiques sont identifiés : une logique d’entreprise, une logique sectorielle et une logique territoriale. Ces univers se différencient de manière assez claire, et organisent des visions bien distinctes du DD et de son opérationnalisation dans le secteur de la promotion immobilière. Se pose alors la question de la convergence des logiques d’action en vue d’opérationnaliser le développement durable à l’échelle d’un territoire. Les élus la voient comme partenariale et non-financière alors que les dirigeants du promoteur immobilier privé en ont une conception actionnariale et financière. Une des conditions de l’opérationnalisation semble ainsi résider dans la construction d’un compromis autour de la valeur associée au DD.
Mechanical Behavior of X-65 Seamless Rigid Pipe During Resonant Fatigue Testing: A Numerical and Experimental Approach
Authors: Stapasolla Tayron Zilli , Pinto Otávio de Oliveira , Mosquen Amauri , Borges Marcelo Favaro , Kwietniewski Carlos Eduardo Fortis
Published: October 2017

The aim of this paper is to establish a relationship between strain and acceleration, obtained at the center of the specimen, during resonant fatigue test of a full-scale X-65 seamless rigid pipe. The pipe was submitted to five different strain levels. Strain and acceleration on the outer surface of the specimen were measured and recorded using strain gages and accelerometers located at the center of the pipe, which is the point of maximum stress along the pipe structure during the resonant fatigue test. Thus, strain and acceleration values acquired from experimental tests were processed and compared with FEM modeling results. The results obtained by comparison between experimental and FEM modeling data were satisfactory, with a difference of approximately 0.05%. With these results, this work produced a reliable tool to obtain test parameters, considering different pipe geometries, in order to perform further resonant bending tests becoming the acceleration as an alternative to control test frequency instead of strain values.
Petrophysical Characterization of Carbonates Heterogeneity
Authors: Pires L. O. , Fiorelli G. L. , Winter A. , Trevisan O. V.
Published: October 2017

The heterogeneity of carbonate rocks results from their origin and their sensitivity to physical, chemical and biological alterations, such as dissolution, cementation and recrystallization of their minerals. These phenomena lead to pores with different shapes, origins and sizes, and, consequently, makes it difficult to predict the porosity and permeability distributions of these rocks. In addition, the high heterogeneity of carbonates affects the flow of fluids inside the reservoir and, therefore, the final oil recovery, evidencing the importance of an exhaustive petrophysical characterization of these rocks.

In the present paper carbonate rocks from the same formation were investigated, grouped into two sets: Low Permeability set (LP), with a permeability range between 5 and 15 mD; and High Permeability set (HP), with a permeability range between 90 and 150 mD. Besides basic petrophysical properties (porosity and permeability), other properties, such as pore size and pore throat size distributions, surface area, capillary pressure and relative permeability curves of each set were studied in order to correlate their properties with rock heterogeneity.

Nuclear Magnetic Resonance (NMR) was used to evaluate pore size distributions and the Mercury Intrusion Porosimetry (MICP) was used to determinate pore throat size distributions and capillary pressure curves. It was observed that HP set presents predominantly macropores and macro-throats (about 90% of the porous structure), whereas the LP set presents about 80% of macropores, but approximately the same distribution of mesoand macrothroats (from 40 to 50 %). The lack of macro-throats strangles fluids flow, and it may be one of the factors responsible for lower permeability of LP set samples. Furthermore, when the pore size and pore throat size distributions are similar, it is possible to convert the T2 distribution data to pore throat size with an acceptable correlation. Capillary pressure curves obtained by MICP were normalized with saturation data obtained by High Speed Centrifuge (HSC) tests. Initial water saturation was higher in LP set, as expected. Capillary pressure curves were compared with the data obtained by the two methods, presenting very comparable results. In the same way, the relative permeability curves also presented similar results by the two methods.

In this study we could observe the association that different permeabilities of rocks from the same formation have with petrophysical properties, such as pore size and pore throats distributions, capillary pressure and relative permeability curves.