bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of cutting parameters on workpiece and tool properties during drilling of Ti-6Al-4V
Authors: Çelik Yahya Hışman , Yildiz Hakan , Özek Cebeli 
Published: May 2016

Abstract
The main aim of machining is to provide the dimensional preciseness together with surface and geometric quality of the workpiece to be manufactured within the desired limits. Today, it is quite hard to drill widely utilized Ti-6Al-4 V alloys owing to their superior features. Therefore, in this study, the effects of temperature, chip formation, thrust forces, surface roughness, burr heights, hole diameter deviations and tool wears on the drilling of Ti-6Al-4 V were investigated under dry cutting conditions with different cutting speeds and feed rates by using tungsten carbide (WC) and high speed steel (HSS) drills. Moreover, the mathematical modeling of thrust force, surface roughness, burr height and tool wear were formed using Matlab. It was found that the feed rate, cutting speed and type of drill have a major effect on the thrust forces, surface roughness, burr heights, hole diameter deviations and tool wears. Optimum results in the Ti-6Al-4 V alloy drilling process were obtained using the WC drill.
Luminous transmittance of carbonate based natural stones
Authors: Ersoy Metin , Yıldız Ahmet , Turgut Volkan 
Published: May 2016

Abstract
Some natural stones, such as marble, onyx and limestone are translucent and commonly used in night lamps, lampshades, and backlit decorations in hotel lobbies and other facilities. However, there is no study in literature with respect to the luminous transmittance or transparency of natural stones. In this study, the luminous transmittance of 12 different carbonate based natural stones was assessed. An apparatus consisting of a light source, a light conducting tube and a luxmeter was designed to determine luminous transmittance. Also, the samples have been examined with regard to grain size to define their mineralogical and petrographical characteristics. As a result of the studies, it has been found that marble and onyx marble can transmit light to a greater extent compared to limestone. And it has been seen that the efficient factors in those samples are color, crystal type, grain sizes and cement substance of the rock.
RADIAL MOTIONS IN DISK STARS: ELLIPTICITY OR SECULAR FLOWS?
Authors: López-Corredoira M. , González-Fernández C. 
Published: May 2016

ABSTRACT
Average stellar orbits of the Galactic disk may have some small intrinsic ellipticity which breaks the exact axisymmetry and there may also be some migration of stars inwards or outwards. Both phenomena can be detected through kinematic analyses. We use the red clump stars selected spectroscopically from the APO Galactic Evolution Experiment, with known distances and radial velocities, to measure the radial component of the Galactocentric velocities within 5 kpc < R < 16 kpc,

, and within 20° from the Sun–Galactic center line. The average Galactocentric radial velocity is V

R
= (1.48 ± 0.35)[R(kpc) − (8.8 ± 2.7)] km s−1 outwards in the explored range, with a higher contribution from stars below the Galactic plane. Two possible explanations can be given for this result: (i) the mean orbit of the disk stars is intrinsically elliptical with a Galactocentric radial gradient of eccentricity around 0.01 kpc−1; or (ii) there is a net secular expansion of the disk, in which stars within R ≈ 9–11 kpc are migrating to the region R ≳ 11 kpc at the rate of ∼2 M
⊙ yr−1, and stars with R ≲ 9 kpc are falling toward the center of the Galaxy. This migration ratio would be unattainable for a long time and should decelerate, otherwise the Galaxy would fade away in around 1 Gyr. At present, both hypotheses are speculative and one would need data on the Galactocentric radial velocities for other azimuths different to the center or anticenter in order to confirm one of the scenarios.
MULTI-FILTER LIGHT CURVES OF 29 VERY SHORT PERIOD CANDIDATE CONTACT BINARIES
Authors: Koen C. , Koen T. , Gray R. O. 
Published: June 2016

ABSTRACT
Light curves of 26 probable contact binary stars are made available, from a list of candidates with the shortest periods known. This is supplemented by sets of light curves of three previously studied systems. Photometry was obtained in the Johnson UBV, Cousins RI system. All stars but one were observed in four wavebands, either UBV R

C
or

BV

(
RI
)

C

, depending on brightness. Tentative spectral classifications are given for 23 of the stars. Effective temperatures are derived from infrared and optical photometric indices, and from spectral types. These are generally in good agreement. The multicolor photometry, spectral typing, and estimated effective temperatures can be used to model these systems in detail. A preliminary study, based on Fourier coefficients of the light curves, suggests that all the systems are indeed eclipsing stars, with all but a handful probably in contact configurations.
THE ORION FINGERS: NEAR-IR SPECTRAL IMAGING OF AN EXPLOSIVE OUTFLOW
Authors: Youngblood Allison , Ginsburg Adam , Bally John 
Published: June 2016

ABSTRACT
We present near-IR (1.1–2.4 μm) position–position–velocity cubes of the 500 year old Orion BN/KL explosive outflow with spatial resolution 1″ and spectral resolution 86 km s−1. We construct integrated intensity maps free of continuum sources of 15 H2 and [Fe ii] lines while preserving kinematic information of individual outflow features. Included in the detected H2 lines are the 1-0 S(1) and 1-0 Q(3) transitions, allowing extinction measurements across the outflow. Additionally, we present dereddened flux ratios for over two dozen outflow features to allow for the characterization of the true excitation conditions of the BN/KL outflow. All of the ratios show the dominance of the shock excitation of the H2 emission, although some features exhibit signs of fluorescent excitation from stellar radiation or J-type shocks. We also detect tracers of the PDR/ionization front north of the Trapezium stars in [O i] and [Fe ii] and analyze other observed outflows not associated with the BN/KL outflow.
OBSERVATIONAL DETECTION OF DRIFT VELOCITY BETWEEN IONIZED AND NEUTRAL SPECIES IN SOLAR PROMINENCES
Authors: Khomenko Elena , Collados Manuel , Díaz Antonio J. 
Published: May 2016

ABSTRACT
We report the detection of differences in the ion and neutral velocities in prominences using high-resolution spectral data obtained in 2012 September at the German Vacuum Tower Telescope (Observatorio del Teide, Tenerife). A time series of scans of a small portion of a solar prominence was obtained simultaneously with high cadence using the lines of two elements with different ionization states, namely, Ca ii 8542 Å and He i 10830 Å. The displacements, widths, and amplitudes of both lines were carefully compared to extract dynamical information about the plasma. Many dynamical features are detected, such as counterstreaming flows, jets, and propagating waves. In all of the cases, we find a very strong correlation between the parameters extracted from the lines of both elements, confirming that both lines trace the same plasma. Nevertheless, we also find short-lived transients where this correlation is lost. These transients are associated with ion-neutral drift velocities of the order of several hundred m s−1. The patches of non-zero drift velocity show coherence in time–distance diagrams.
GLOBULAR CLUSTERS HOSTING INTERMEDIATE-MASS BLACK HOLES: NO MASS-SEGREGATION BASED CANDIDATES
Authors: Pasquato Mario , Miocchi Paolo , Won Sohn Bong , Lee Young-Wook 
Published: May 2016

ABSTRACT
Recently, both stellar mass segregation and binary fractions were uniformly measured on relatively large samples of Galactic globular clusters (GCs). Simulations show that both sizable binary-star populations and intermediate-mass black holes (IMBHs) quench mass segregation in relaxed GCs. Thus mass segregation in GCs with a reliable binary-fraction measurement is a valuable probe to constrain IMBHs. In this paper we combine mass-segregation and binary-fraction measurements from the literature to build a sample of 33 GCs (with measured core binary fractions), and a sample of 43 GCs (with binary-fraction measurements in the area between the core radius and the half-mass radius). Within both samples we try to identify IMBH-host candidates. These should have relatively low mass segregation, a low binary fraction (<5%), and a short (<1 Gyr) relaxation time. Considering the core-binary-fraction sample, no suitable candidates emerge. If the binary fraction between the core and the half-mass radius is considered, two candidates are found, but this is likely due to statistical fluctuations. We also consider a larger sample of 54 GCs where we obtained an estimate of the core binary fraction using a predictive relation based on metallicity and integrated absolute magnitude. Also in this case no suitable candidates are found. Finally, we consider the GC core- to half-mass radius ratio, which is expected to be larger for GCs containing either an IMBH or binaries. We find that GCs with large core- to half-mass radius ratios are less mass-segregated (and show a larger binary fraction), confirming the theoretical expectation that the energy sources responsible for the large core are also quenching mass segregation.
CAN STAR–DISK COLLISIONS EXPLAIN THE MISSING RED GIANTS PROBLEM IN THE GALACTIC CENTER?
Authors: Kieffer T. Forrest , Bogdanović Tamara 
Published: June 2016

ABSTRACT
Observations have revealed a relative paucity of red giant (RG) stars within the central 0.5 pc in the Galactic Center (GC). Motivated by this finding we investigate the hypothesis that collisions of stars with a fragmenting accretion disk are responsible for the observed dearth of evolved stars. We use three-dimensional hydrodynamic simulations to model a star with radius 10 R
⊙ and mass 1 M
⊙, representative of the missing population of RGs, colliding with high density clumps. We find that multiple collisions with clumps of column density ≳108 g cm−2 can strip a substantial fraction of the star’s envelope and in principle render it invisible to observations. Simulations confirm that repeated impacts are particularly efficient in driving mass loss as partially stripped RGs expand and have increased cross sections for subsequent collisions. Because the envelope is unbound on account of the kinetic energy of the star, any significant amount of stripping of the RG population in the GC should be mirrored by a systematic decay of their orbits and possibly by their enhanced rotational velocity. To be viable, this scenario requires that the total mass of the fragmenting disk has been several orders of magnitude higher than that of the early-type stars which now form the stellar disk in the GC.
THE EFFECT OF 22Ne DIFFUSION IN THE EVOLUTION AND PULSATIONAL PROPERTIES OF WHITE DWARFS WITH SOLAR METALLICITY PROGENITORS
Authors: Camisassa María E. , Althaus Leandro G. , Córsico Alejandro H. , Vinyoles Núria , Serenelli Aldo M. , Isern Jordi , Bertolami Marcelo M. Miller , García–Berro Enrique 
Published: June 2016

ABSTRACT
Because of the large neutron excess of 22Ne, sedimentation of this isotope occurs rapidly in the interior of white dwarfs. This process releases an additional amount of energy, thus delaying the cooling times of the white dwarf. This influences the ages of different stellar populations derived using white dwarf cosmochronology. Furthermore, the overabundance of 22Ne in the inner regions of the star modifies the Brunt–Väisälä frequency, thus altering the pulsational properties of these stars. In this work we discuss the impact of 22Ne sedimentation in white dwarfs resulting from solar metallicity progenitors (Z = 0.02). We performed evolutionary calculations of white dwarfs with masses of 0.528, 0.576, 0.657, and 0.833

derived from full evolutionary computations of their progenitor stars, starting at the zero-age main sequence all the way through the central hydrogen and helium burning, the thermally pulsing asymptotic giant branch (AGB), and post-AGB phases. Our computations show that at low luminosities (

), 22Ne sedimentation delays the cooling of white dwarfs with solar metallicity progenitors by about 1 Gyr. Additionally, we studied the consequences of 22Ne sedimentation on the pulsational properties of ZZ Ceti white dwarfs. We find that 22Ne sedimentation induces differences in the periods of these stars larger than the present observational uncertainties, particularly in more massive white dwarfs.
A SELECTION OF GIANT RADIO SOURCES FROM NVSS
Authors: Proctor D. D. 
Published: June 2016

ABSTRACT
Results of the application of pattern-recognition techniques to the problem of identifying giant radio sources (GRSs) from the data in the NVSS catalog are presented, and issues affecting the process are explored. Decision-tree pattern-recognition software was applied to training-set source pairs developed from known NVSS large-angular-size radio galaxies. The full training set consisted of 51,195 source pairs, 48 of which were known GRSs for which each lobe was primarily represented by a single catalog component. The source pairs had a maximum separation of

and a minimum component area of 1.87 square arcmin at the 1.4 mJy level. The importance of comparing the resulting probability distributions of the training and application sets for cases of unknown class ratio is demonstrated. The probability of correctly ranking a randomly selected (GRS, non-GRS) pair from the best of the tested classifiers was determined to be 97.8 ± 1.5%. The best classifiers were applied to the over 870,000 candidate pairs from the entire catalog. Images of higher-ranked sources were visually screened, and a table of over 1600 candidates, including morphological annotation, is presented. These systems include doubles and triples, wide-angle tail and narrow-angle tail, S- or Z-shaped systems, and core-jets and resolved cores. While some resolved-lobe systems are recovered with this technique, generally it is expected that such systems would require a different approach.
COMPREHENSIVE STUDY OF THE X-RAY FLARES FROM GAMMA-RAY BURSTS OBSERVED BY SWIFT
Authors: Yi Shuang-Xi , Xi Shao-Qiang , Yu Hai , Wang F. Y. , Mu Hui-Jun , Lü Lian-Zhong , Liang En-Wei 
Published: June 2016

ABSTRACT
X-ray flares are generally supposed to be produced by later activities of the central engine, and may share a similar physical origin with the prompt emission of gamma-ray bursts (GRBs). In this paper, we have analyzed all significant X-ray flares from the GRBs observed by Swift from 2005 April to 2015 March. The catalog contains 468 bright X-ray flares, including 200 flares with redshifts. We obtain the fitting results of X-ray flares, such as start time, peak time, duration, peak flux, fluence, peak luminosity, and mean luminosity. The peak luminosity decreases with peak time, following a power-law behavior

. The flare duration increases with peak time. The 0.3–10 keV isotropic energy of the distribution of X-ray flares is a log-normal peaked at

erg. We also study the frequency distributions of flare parameters, including energies, durations, peak fluxes, rise times, decay times, and waiting times. Power-law distributions of energies, durations, peak fluxes, and waiting times are found in GRB X-ray flares and solar flares. These distributions could be well explained by a fractal-diffusive, self-organized criticality model. Some theoretical models based on magnetic reconnection have been proposed to explain X-ray flares. Our result shows that the relativistic jets of GRBs may be dominated by Poynting flux.
HIGHEST REDSHIFT IMAGE OF NEUTRAL HYDROGEN IN EMISSION: A CHILES DETECTION OF A STARBURSTING GALAXY AT z = 0.376
Authors: Fernández Ximena , Gim Hansung B. , Gorkom J. H. van , Yun Min S. , Momjian Emmanuel , Popping Attila , Chomiuk Laura , Hess Kelley M. , Hunt Lucas , Kreckel Kathryn , Lucero Danielle , Maddox Natasha , Oosterloo Tom , Pisano D. J. , Verheijen M. A. W. , Hales Christopher A. , Chung Aeree , Dodson Richard , Golap Kumar , Gross Julia , Henning Patricia , Hibbard John , Jaffé Yara L. , Meyer Jennifer Donovan , Meyer Martin , Sanchez-Barrantes Monica , Schiminovich David , Wicenec Andreas , Wilcots Eric , Bershady Matthew , Scoville Nick , Strader Jay , Tremou Evangelia , Salinas Ricardo , Chávez Ricardo 
Published: June 2016

ABSTRACT
Our current understanding of galaxy evolution still has many uncertainties associated with the details of the accretion, processing, and removal of gas across cosmic time. The next generation of radio telescopes will image the neutral hydrogen (H i) in galaxies over large volumes at high redshifts, which will provide key insights into these processes. We are conducting the COSMOS H i Large Extragalactic Survey (CHILES) with the Karl G. Jansky Very Large Array, which is the first survey to simultaneously observe H i from z = 0 to z ∼ 0.5. Here, we report the highest redshift H i 21 cm detection in emission to date of the luminous infrared galaxy COSMOS J100054.83+023126.2 at z = 0.376 with the first 178 hr of CHILES data. The total H i mass is (2.9 ± 1.0) × 1010
M
⊙ and the spatial distribution is asymmetric and extends beyond the galaxy. While optically the galaxy looks undisturbed, the H i distribution suggests an interaction with a candidate companion. In addition, we present follow-up Large Millimeter Telescope CO observations that show it is rich in molecular hydrogen, with a range of possible masses of (1.8–9.9) × 1010
M
⊙. This is the first study of the H i and CO in emission for a single galaxy beyond z ∼ 0.2.
Costs in Relation to Disability, Disease Activity, and Health-related Quality of Life in Rheumatoid Arthritis: Observational Data from Southern Sweden
Authors: Wallman Johan K. , Eriksson Jonas K. , Nilsson Jan-Åke , Olofsson Tor , Kristensen Lars-Erik , Neovius Martin , Geborek Pierre 
Published: June 2016

Objective.To compare how costs relate to disability, disease activity, and health-related quality of life (HRQOL) in rheumatoid arthritis (RA).Methods.Antitumor necrosis factor (anti-TNF)-treated patients with RA in southern Sweden (n = 2341) were monitored 2005–2010. Health Assessment Questionnaire (HAQ), 28-joint Disease Activity Score (DAS28), and EQ-5D scores were linked to register-derived costs of antirheumatic drugs (excluding anti-TNF agents), patient care, and work loss from 30 days before to 30 days after each visit (n = 13,289). Associations of HAQ/DAS28/EQ-5D to healthcare (patient care and drugs) and work loss costs (patients < 65 yrs) were studied in separate regression models, comparing standardized β coefficients by nonparametric bootstrapping to assess which measure best reflects costs. Analyses were conducted based on both individual means (linear regression, comparing between-patient associations) and by generalized estimating equations (GEE), using all observations to also account for within-patient associations of HAQ/DAS28/EQ-5D to costs.Results.Regardless of the methodology (linear or GEE regression), HAQ was most closely related to both cost types, while work loss costs were also more closely associated with EQ-5D than DAS28. The results of the linear models for healthcare costs were standardized β = 0.21 (95% CI 0.15–0.27), 0.16 (0.11–0.21), and –0.15 (−0.21 to −0.10) for HAQ/DAS28/EQ-5D, respectively (p < 0.05 for HAQ vs DAS28/EQ-5D). For work loss costs, the results were standardized β = 0.43 (95% CI 0.39–0.48), 0.27 (0.23–0.32), and −0.34 (−0.38 to −0.29) for HAQ/DAS28/EQ-5D, respectively (p < 0.05 for HAQ vs DAS28/EQ-5D and for EQ-5D vs DAS28).Conclusion.Overall, HAQ disability is a better marker of RA costs than DAS28 or EQ-5D HRQOL.
Differences in Clinical Features and Mortality between Childhood-onset and Adult-onset Systemic Lupus Erythematosus: A Prospective Single-center Study
Authors: Joo Young Bin , Park So-Yeon , Won Soyoung , Bae Sang-Cheol 
Published: June 2016

Objective.To compare clinical features and mortality between childhood-onset systemic lupus erythematosus (cSLE) and adult-onset SLE (aSLE) in a prospective single-center cohort.Methods.A total of 1112 patients with SLE (133 cSLE and 979 aSLE) were enrolled and followed from 1998 to 2012. The 2 groups were compared regarding American College of Rheumatology (ACR) classification criteria for SLE, autoantibodies, disease activity measured by the Adjusted Mean SLE Disease Activity Index (AMS), damage measured by the Systemic Lupus International Collaborating Clinics/ACR Damage Index (SDI), and medication. The standardized mortality ratio (SMR) was calculated. Predictors of mortality in SLE were evaluated using Cox proportional hazard models.Results.After a mean followup of 7.6 years, patients with cSLE had a higher number of cumulative ACR criteria and a higher AMS (p < 0.001 each), but there was no difference in SDI (p = 0.797). Immunosuppressants were used more frequently by patients with cSLE (p < 0.001). The SMR of cSLE was 18.8 (95% CI 8.6–35.6), significantly higher than that of aSLE (2.9, 95% CI 2.1–3.9). We found cSLE to be an independent predictor of mortality (HR 3.6, p = 0.008). Moreover, presence of hemolytic anemia (7.2, p = 0.034) and antiphospholipid antibody (aPL; 3.8, p = 0.041) increased the magnitude of risk of early mortality more in the patients with cSLE than in those with aSLE.Conclusion.The clinical course of cSLE as measured by number of clinical manifestations and disease activity is worse than that of aSLE. Also, cSLE patients with hemolytic anemia and aPL are at greater risk of death than patients with aSLE who have those features.
Trends in Emergency Department Visits and Charges for Gout in the United States between 2006 and 2012
Authors: Jinno Sadao , Hasegawa Kohei , Neogi Tuhina , Goto Tadahiro , Dubreuil Maureen 
Published: June 2016

Objective.To examine temporal trends in the rate of gout emergency department (ED) visits and charges in the United States between 2006 and 2012.Methods.A serial cross-sectional analysis of the Nationwide Emergency Department Sample.Results.The rate of ED visits for gout in adults overall increased from 75.0 to 85.4 per 100,000 persons over the study period (14% increase, p < 0.001), and increased 29% for those aged 45–54 years. Nationwide ED charges increased from $156 million to $281 million (80% increase, p < 0.001).Conclusion.Between 2006 and 2012, the rate of gout ED visits increased among US adults, most notably in those aged 45–54 years.
Louis Couturat, ou une occasion perdue pour une approche sémiotique dans l’épistémologie française
Authors: Schlaudt Oliver 
Published: June 2016

Il existe chez Couturat une ambiguïté qui semble cruciale pour la réception de son œuvre. L’idiosyncrasie de son approche métaphysique et antinominaliste des théories scientifiques a empêché un dialogue fécond entre l’auteur et l’épistémologie française ; mais dans la réalisation de son programme métaphysique, Couturat s’est approché d’une théorie sémiotique qui n’est pas sans ressemblance avec celle de Goodman et qui a gardé un intérêt pour l’épistémologie contemporaine.