bluuebunny/crossref_metadata_2025_split huggingface dataset:
Emergence and Variability of Broad Absorption Line Quasar Outflows
Authors: Rogerson J. A. , Hall P. B. , Ahmed N. S. , Hidalgo P. Rodríguez , Brandt W. N. , Ak N. Filiz 
Published: July 2018

Abstract
We isolate a set of quasars that exhibit emergent C iv broad absorption lines (BALs) in their spectra by comparing spectra in the Sloan Digital Sky Survey (SDSS) Data Release 7 and the SDSS/BOSS Data Releases 9 and 10. After visually defining a set of emergent BALs, follow-up observations were obtained with the Gemini Observatory for 105 quasars. We find an emergence rate consistent with the previously reported disappearance rate of BAL quasars given the relative numbers of non-BAL and BAL quasars in the SDSS. We find that candidate newly emerged BALs are preferentially drawn from among BALs with smaller balnicity indices, shallower depths, larger velocities, and smaller widths. Within two rest-frame years (average) after a BAL has emerged, we find it equally likely to continue increasing in equivalent width in an observation 6 months later (average) as it is to start decreasing. From the time separations between our observations, we conclude that the coherence timescale of BALs is less than 100 rest-frame days. We observe coordinated variability among pairs of troughs in the same quasar, likely due to clouds at different velocities responding to the same changes in ionizing flux, and the coordination is stronger if the velocity separation between the two troughs is smaller. We speculate that the latter effect may be due to clouds having on average lower densities at higher velocities owing to mass conservation in an accelerating flow, causing the absorbing gas in those clouds to respond on different timescales to the same ionizing flux variations.
A New Detection of Extragalactic Anomalous Microwave Emission in a Compact, Optically Faint Region of NGC 4725
Authors: Murphy E. J. , Linden S. T. , Dong D. , Hensley B. S. , Momjian E. , Helou G. , Evans A. S. 
Published: July 2018

Abstract
We discuss the nature of a discrete, compact radio source (NGC 4725 B) located ≈1.9 kpc from the nucleus in the nearby star-forming galaxy NGC 4725, which we believe to be a new detection of extragalactic anomalous microwave emission (AME). Based on detections at 3, 15, 22, 33, and 44 GHz, NGC 4725 B is a microjansky radio source peaking at ≈33 GHz. While the source is not identified in optical (BVRI) photometry, we detect counterparts in the midinfrared Spitzer/IRAC bands (3.6, 4.5, 5.8, 8.0 μm) that appear to be associated with dust emission in the central region of NGC 4725. Consequently, we conclude that NGC 4725 B is a new detection of AME and is very similar to a recent detection of AME in an outer-disk star-forming region in NGC 6946. We find that models of electric dipole emission from rapidly rotating ultra-small grains are able to reproduce the radio spectrum for reasonable interstellar medium conditions. Given the lack of an optical counterpart and the shape of the radio spectrum, NGC 4725 B appears consistent with a nascent star-forming region in which young (≲3 Myr) massive stars are still highly enshrouded by their natal cocoons of gas and dust with insufficient supernovae occurring to produce a measurable amount of synchrotron emission.
A New Look at an Old Cluster: The Membership, Rotation, and Magnetic Activity of Low-mass Stars in the 1.3 Gyr Old Open Cluster NGC 752
Authors: Agüeros M. A. , Bowsher E. C. , Bochanski J. J. , Cargile P. A. , Covey K. R. , Douglas S. T. , Kraus A. , Kundert A. , Law N. M. , Ahmadi A. , Arce H. G. 
Published: July 2018

Abstract
The nearby open cluster NGC 752 presents a rare opportunity to study stellar properties at ages >1 Gyr. However, constructing a membership catalog for it is challenging; most surveys have been limited to identifying its giants and dwarf members earlier than mid-K. We supplement past membership catalogs with candidates selected with updated photometric and proper-motion criteria, generating a list of 258 members, a >50% increase over previous catalogs. Using a Bayesian framework to fit MESA Isochrones & Stellar Tracks evolutionary models to literature photometry and the Tycho-Gaia Astrometric Solution data available for 59 cluster members, we infer the age of and distance to NGC 752: 1.34 ± 0.06 Gyr and

pc. We also report the results of our optical monitoring of the cluster using the Palomar Transient Factory. We obtain rotation periods for 12 K and M cluster members, the first periods measured for such low-mass stars with a well-constrained age >1 Gyr. We compare these new periods to data from the younger clusters Praesepe and NGC 6811, and to a theoretical model for angular momentum loss, to examine stellar spin-down for low-mass stars over their first 1.3 Gyr. While on average NGC 752 stars are rotating more slowly than their younger counterparts, the difference is not significant. Finally, we use our spectroscopic observations to measure Hα for cluster stars, finding that members earlier than ≈M2 are magnetically inactive, as expected at this age. Forthcoming Gaia data should solidify and extend the membership of NGC 752 to lower masses, thereby increasing its importance for studies of low-mass stars.
The MAVERIC Survey: Still No Evidence for Accreting Intermediate-mass Black Holes in Globular Clusters
Authors: Tremou Evangelia , Strader Jay , Chomiuk Laura , Shishkovsky Laura , Maccarone Thomas J. , Miller-Jones James C. A. , Tudor Vlad , Heinke Craig O. , Sivakoff Gregory R. , Seth Anil C. , Noyola Eva 
Published: July 2018

Abstract
We present the results of an ultradeep, comprehensive radio continuum survey for the accretion signatures of intermediate-mass black holes (IMBHs) in globular clusters (GCs). The sample, imaged with the Karl G. Jansky Very Large Array and the Australia Telescope Compact Array, comprises 50 Galactic GCs. No compelling evidence for an IMBH is found in any cluster in our sample. In order to achieve the highest sensitivity to low-level emission, we also present the results of an overall stack of our sample as well as various subsamples, also finding nondetections. These results strengthen the idea that IMBHs with masses ≳1000M
⊙ are rare or absent in GCs.
Surface and Core Detonations in Rotating White Dwarfs
Authors: García-Senz D. , Cabezón R. M. , Domínguez I. 
Published: July 2018

Abstract
The feasibility of the double detonation mechanism—surface helium detonation followed by complete carbon detonation of the core—in a rotating white dwarf with mass ≃1 M
⊙ is studied using three-dimensional hydrodynamic simulations. A rapid rigid rotation of the white dwarf was assumed, so that its initial spherical geometry is considerably distorted. Unlike spherically symmetric models, we found that when helium ignition is located far from the spinning axis, the detonation fronts converge asynchronically at the antipodes of the ignition point. Nevertheless, the detonation of the carbon core still remains as the most probable outcome. The detonation of the core gives rise to a strong explosion, matching many of the basic observational constraints of Type Ia supernovae (SNe Ia). We conclude that the double detonation mechanism also works when the white dwarf is rapidly rotating. These results provide further evidence for the viability of sub-Chandrasekhar-mass models as well as some double degenerate models (those having some helium fuel at the merging moment), making them appealing channels for the production of SN Ia events.
A Distinct Nucleosynthetic Heritage for Early Solar System Solids Recorded by Ni Isotope Signatures
Authors: Render Jan , Brennecka Gregory A. , Wang Shui-Jiong , Wasylenki Laura E. , Kleine Thorsten 
Published: July 2018

Abstract
As the earliest dated solids, calcium–aluminum-rich inclusions (CAIs) provide a unique window into the early solar system. However, for many elements, CAIs have been shown to exhibit a very different nucleosynthetic isotope signature from that of later-formed bulk meteorites. To explore this critical difference between solar system materials, we investigate a broad set of CAI samples for both mass-dependent and non-mass-dependent (nucleosynthetic) isotope variations in the siderophile element nickel (Ni). We find that fine-grained CAIs show little if any mass-dependent Ni isotopic fractionation, whereas coarse-grained inclusions exhibit a broad range of isotopically heavy signatures. Because mass-dependent variations appear to be coupled with nucleosynthetic anomalies in CAIs, a part of this Ni isotope variability could be due to thermal processing that acted on these samples. Nucleosynthetic Ni isotopic signatures show that CAIs share a genetic heritage with carbonaceous meteorites and provide a clear distinction from the isotopic reservoirs occupied by terrestrial Ni and non-carbonaceous meteorites. However, whereas nucleosynthetic Ni isotope heterogeneity in previously investigated bulk meteorites was ascribed to variation in the neutron-poor isotope 58Ni, we here find that CAI signatures require variability in other, more neutron-rich Ni isotopes. Taken in aggregate with previous work, this highlights a change in the nucleosynthetic character from CAIs to later-formed solids that cannot be explained by variable admixture of a single presolar phase or material from a specific supernova shell. Instead, these data reveal the complex evolution of the solar system, including blending and reprocessing of matter from several generations and types of stars.
A Photometric Redshift Catalog Based on SCUSS, SDSS, and WISE Surveys
Authors: Gao Jinghua , Zou Hu , Zhou Xu , Kong Xu 
Published: July 2018

Abstract
We publish a photometric redshift catalog based on imaging data of the South Galactic Cap u-band Sky Survey, Sloan Digital Sky Survey (SDSS), and Wide-field Infrared Survey Explorer. A total of seven photometric bands are used, ranging from near-ultraviolet to near-infrared. A local linear regression method is adopted to estimate the photometric redshift with a dedicated spectroscopic training set. The photometric redshift catalog contains about 23.1 million galaxies classified by SDSS. Using the training set with redshift up to 0.8 and r-band magnitude down to 22 mag, we achieve an average bias of

, a standard deviation of σ(Δz
norm) = 0.019, and a 3σ outlier rate of about 4.2%. The bias is less than 0.01 at z < 0.6 and goes up to about 0.05 at z ∼ 0.8. Compared with SDSS photometric redshifts, our redshift estimations are more accurate and have less bias.
Signatures of Magnetic Activity in the Seismic Data of Solar-type Stars Observed by Kepler
Authors: Santos A. R. G. , Campante T. L. , Chaplin W. J. , Cunha M. S. , Lund M. N. , Kiefer R. , Salabert D. , García R. A. , Davies G. R. , Elsworth Y. , Howe R. 
Published: July 2018

Abstract
In the Sun, the frequencies of the acoustic modes are observed to vary in phase with the magnetic activity level. These frequency variations are expected to be common in solar-type stars and contain information about the activity-related changes that take place in their interiors. The unprecedented duration of Kepler photometric time-series provides a unique opportunity to detect and characterize stellar magnetic cycles through asteroseismology. In this work, we analyze a sample of 87 solar-type stars, measuring their temporal frequency shifts over segments of 90 days. For each segment, the individual frequencies are obtained through a Bayesian peak-bagging tool. The mean frequency shifts are then computed and compared with: (1) those obtained from a cross-correlation method; (2) the variation in the mode heights; (3) a photometric activity proxy; and (4) the characteristic timescale of the granulation. For each star and 90-day sub-series, we provide mean frequency shifts, mode heights, and characteristic timescales of the granulation. Interestingly, more than 60% of the stars show evidence for (quasi-)periodic variations in the frequency shifts. In the majority of the cases, these variations are accompanied by variations in other activity proxies. About 20% of the stars show mode frequencies and heights varying approximately in phase, in opposition to what is observed for the Sun.
KYDISC: Galaxy Morphology, Quenching, and Mergers in the Cluster Environment
Authors: Oh Sree , Kim Keunho , Lee Joon Hyeop , Sheen Yun-Kyeong , Kim Minjin , Ree Chang H. , Ho Luis C. , Kyeong Jaemann , Sung Eon-Chang , Park Byeong-Gon , Yi Sukyoung K. 
Published: July 2018

Abstract
We present the KASI-Yonsei Deep Imaging Survey of Clusters targeting 14 clusters at 0.015 ≲ z ≲ 0.144 using the Inamori Magellan Areal Camera and Spectrograph on the 6.5 m Magellan Baade telescope and the MegaCam on the 3.6 m Canada–France–Hawaii Telescope. We provide a catalog of cluster galaxies that lists magnitudes, redshifts, morphologies, bulge-to-total ratios, and local density. Based on the 1409 spectroscopically confirmed cluster galaxies brighter than −19.8 in the r band, we study galaxy morphology, color, and visual features generated by galaxy mergers. We see a clear trend between morphological content and cluster velocity dispersion, which was not presented by previous studies using local clusters. Passive spirals are preferentially found in a highly dense region (i.e., cluster center), indicating that they have gone through environmental quenching. In deep images (μ

r′ ∼ 27

), 20% of our sample shows signatures of recent mergers, which is not expected from theoretical predictions and a low frequency of ongoing mergers in our sample (∼4%). Such a high fraction of recent mergers in the cluster environment supports a scenario that the merger events that made the features have preceded the galaxy accretion into the cluster environment. We conclude that mergers affect a cluster population mainly through the preprocessing of recently accreted galaxies.
Anticosti Island: a hot spot for Neospondylis upiformis (Coleoptera: Cerambycidae) in eastern Canada?
Authors: Hébert Christian , Laplante Serge , Fréchette Mario , Jobin Luc 
Published: July 2018

During an inventory of insect diversity on Anticosti Island in 1993, we caught unprecedented numbers of Neospondylis upiformis (Mannerheim), a longhorned beetle rarely observed in eastern North America. All specimens were caught using 12-funnel Lindgren traps baited with 95% ethanol and α-pinene. This longhorned beetle was captured again in 2007 on Anticosti with the same traps. Other than that, seven specimens of N. upiformis were caught elsewhere in Quebec between 1993 and 2015. Only 14 specimens were found in the 45 most important insect collections of the province, the most recent specimen dating back to 1964.
At least 90% of the captures came from old-growth balsam fir stands of the south-central part of the island. Seasonal flight activity ranged from early June to late July, but adult captures peaked in early July. Results suggest that Anticosti Island might be a hot spot for N. upiformis in eastern North America, particularly in its south-central part where old-growth balsam fir forests still exist.
Endothelotropic activity of 4-hydroxy-3,5-di-tret-butylcinnamic acid in the conditions of experimental cerebral ischemia
Authors: Voronkov Andrey V. , Pozdnyakov Dmitrij I. 
Published: July 2018

Introduction: The aim of the study was to evaluate the endothelioprotective activity of 4-hydroxy-3,5-di-tret-butylcinnamic acid in conditions of experimental cerebral ischemia.
Materials and methods: The brain ischemia was reproduced by the method of irreversible right-sided thermocoagulation of the middle cerebral artery. As comparative drugs, mexidol (30 mg/kg) and sulodexide (30 U/kg) were used. The vasodilating function of the vascular endothelium was assessed by the change in the rate of cerebral blood flow when the synthesis of nitric oxide was modified. Antithrombotic function was assessed by changes in the concentration of thromboxane A2, fibrinogen, von Willebrand factor activity and platelet aggregation activity. Serum concentration of C-reactive protein served as a marker of the state of anti-inflammatory endothelial function. To determine the potential mechanism of endothelioprotective activity of 4-4-hydroxy-3,5-di-tret-butylcinnamic acid, the anti-radical activity of this compound toward superoxide and nitrosy-radicals was assessed; and the effect of the compound on the mitochondrial function was studied, by evaluating the functional activity of mitochondrial ATP synthetase and cytochrome-c-oxidase by ELISA.
Results and discussion: In the course of the study, a positive effect of 4-hydroxy-3,5-di-tret-butylcinnamic acid on the state of endothelial function in cerebral ischemia was established, which was expressed in the preservation of vasodilating (restoring the vascular reaction to acetylcholine, nitro-L-arginine methyl ether, L-arginine), antithrombotic (a decrease in the concentration of thromboxane A2, fibrinogen and von Willebrand factor activity by 241.9% (p <0.05), 73.5% (p <0.05), 20.4% (p <0.05), respectively, a decrease in the degree of aggregation and platelet aggregation rate by 56.7 % (p <0.05) and 52.8% (p <0.05), respectively, and anti-inflammatory vascular endothelial function (99.1% C-reactive protein reduction (p <0.05)). The 4-hydroxy-3,5-di-tret-butylcinnamic acid compound in vitro tests suppressed generation of superoxide (IC50 = 1.99 mg/ml) and nitrosyl radical (IC50 = 1.92 mg/ml), eliminated NO-synthase uncoupling, and restored the mitochondrial function (increase in mitochondrial ATP synthase and cytochrome-c-oxidase activity by 23.5% (p <0.05) and 110.8% (p <0.05), respectively).
Conclusion: The study demonstrated the presence of endotheliotropic activity of 4-hydroxy-3,5-di-tret-butylcinnamic acid, which is expressed in the preservation of vasodilating, antithrombotic and anti-inflammatory functions of the vascular endothelium in conditions of cerebral ischemia. At the same time, the anti-radical properties of this compound, as well as the direct effect on the functional activity of the NO-synthase system and the improvement of the mitochondrial function, may underlie the endotheliotropic effects of 4-hydroxy-3,5-di-tret-butylcinnamic acid.
TUNABLE NMR RECEIVER FRONT-END USING VARIABLE MEMS CAPACITOR
Authors: Ghasemi Mir Majid , Bahrami Manouchehr , Daneshvar Sabalan 
Published: July 2018

In this paper, a tunableMicroElectro Mechanical Systems Nuclear Magnetic Resonance (MEMS NMR) receiver front-end, which consists of three main parts, is presented. In the first part, a proper microcoil for detecting [Formula: see text] and [Formula: see text] with complete specifications regarding the sample is optimized to get the better Signal to Noise Ratio (SNR) and quality factor (Q). In the second part, the passive network is discussed and the amounts of the desired capacitor and the desired tunability range are calculated and based on the calculations and the fabrication process, a new MEMS tunable capacitor is presented. Due to the large capacitance value of the required capacitor, the proposed capacitor has a fixed part with a capacitance value of 28[Formula: see text]pf and a variable part with a tunability range of 193% (2.25[Formula: see text]pf–6.6[Formula: see text]pf) with 1.5 A applied to a thermal actuator. A buckling effect due to the weight of the fingers of the capacitor and thermal stress after the release is analyzed and a fabrication process based on the routine processes is proposed. In the third part, a low noise amplifier (LNA) is presented for the proposed receiver with a gain of 47.6[Formula: see text]dB at the bandwidth of 384 MHz and noise figure of 0.5[Formula: see text][Formula: see text].In this work, modeling and investigation of surface microcoils and also the capacitor are conducted using finite element simulation in COMSOL Multiphysics and post-processing. The method for obtaining signal sensitivity and SNR of the microcoils are based on the MR signal generation by employing the principle of reciprocity.
Public role of the church in anti-corruption: An assessment of the CCAP1 Livingstonia Synod in Malawi from a kenōsis perspective
Authors: Jere Qeko 
Published: July 2018

Corruption, which is a persistent feature in human societies throughout time and space, affects not only the administration of the state but also every societal organ including the church. The ‘virus of corruption’ has penetrated into functioning systems of the various stakeholders both locally and globally. Various approaches have been used in trying to curb corruption at different levels from a secular perspective, but with little progress as the vice eminently still exists in the society. To the contrary and from a theological perspective, the long-lasting solutions in curbing corruption are realised through engaging the main root cause of the problem, which in this case is the heart of man. Theologically, kenōsis as a theoretical framework and solution goes beyond the gist of secular approaches as it addresses issues of the hearts of men which in turn produces reformed systems. In this article, I look into kenōsis of the Synod operational system in relation to imitating the incarnate work of Christ. The article assesses the Synod anti-corruption initiatives from a kenōsis perspective and then identifies and proposes the effective steps to improve and strengthen the Synod’s kenotic actions in Public Square. The CCAP Livingstonia Synod assessment process is geared to show how far kenotic the church must go in emulating and confronting systems as a way of fulfilling the demands of incarnation and works of Christ. This highlights the critical areas that add value in the Synod’s public engagement in anti-corruption.Intradisciplinary and/or interdisciplinary implications: This is an interdisciplinary article that focuses on systematic, church history, public theology and social development. The article assesses the public role of the church in anti-corruption and provides a paradigm shift in the fight against corruption from secular to theological based approaches.
Iatrogenic implantation of myxoid dedifferentiated chondrosarcoma at donor site: A case report and review of literature
Authors: Khadanga Chira Ranjan , Gajagowni Jagadishwar Goud 
Published: July 2018

AbstractIatrogenic implantation of chondrosarcoma (CS) is not only extremely rare but also technically avoidable and impacts with morbidity, mortality, and quality of life (QoL). We report a similar case of myxoid dedifferentiated CS at remote tissue-graft donor site (left chest-wall pectoralis major myocutaneous flap). Although the exact mechanism of primary tumor cells seeding is not clear, the probable causes are direct contamination from surgical instruments and altered blood circulation at the graft-donor site.
Bending Moment Capacity of Stainless Steel-Concrete Composite Beams
Authors: Cashell Katherine Ann , Shamass Rabee 
Published: July 2018

Stainless steel is increasingly popular in construction owing to its corrosion resistance, excellent mechanical and physical properties as well as its aesthetic appearance. The current paper is concerned with the use of stainless steel in steel-concrete composite beams, which is a new application. Current design codes for steel-concrete composite beams neglect strain hardening in the steel. Whilst this is a reasonable assumption for carbon steel, stainless steel is a very ductile material which offers significant levels of strain hardening prior to failure. Therefore, when current design provisions are applied to stainless steel composite beams, the strength predictions are generally inaccurate. The current study presents a simplified analytical solution that takes into consideration the strain hardening of stainless steel when bending moment capacity is calculated. A finite element model is developed and validated against a number of experimental results for composite beams. The validated numerical model is then used to investigate the accuracy of the proposed analytical solution. It is concluded that simplified analytical solution is reliable and provides a straightforward design tool for practicing engineers who wish to specify this novel construction form in appropriate applications.