bluuebunny/crossref_metadata_2025_split huggingface dataset:
Asteroseismic Determination of the Stellar Rotation Period of the Kepler Transiting Planetary Systems and its Implications for the Spin–Orbit Architecture
Authors: Suto 須 Yasushi 藤靖 , Kamiaka 上 Shoya 赤翔也 , Benomar Othman 
Published: April 2019

Abstract
We measure the rotation periods of 19 stars in the Kepler transiting planetary systems, P
rot,astero from asteroseismology and P
rot,phot from the photometric variation of their light curves. Two stars exhibit two clear peaks in the Lomb–Scargle periodogram, neither of which agrees with the seismic rotation period. Other four systems do not show any clear peak, whose stellar rotation period is impossible to estimate reliably from the photometric variation; their stellar equators may be significantly inclined with respect to the planetary orbital plane. For the remaining 13 systems, P
rot,astero and

agree within 30%. Interestingly, 3 out of the 13 systems are in the spin–orbit resonant state in which

with P
orb,b being the orbital period of the innermost planet of each system. The corresponding chance probability is (0.2–4.7)% based on the photometric rotation period data for 464 Kepler transiting planetary systems. While further analysis of stars with reliable rotation periods is required to examine the statistical significance, the spin–orbit resonance between the star and planets, if confirmed, has important implications for the star–planet tidal interaction, in addition to the origin of the spin–orbit (mis-)alignment of transiting planetary systems.
Stellar Occultation by Comet 67P/Churyumov–Gerasimenko Observed with Rosetta's Alice Far-ultraviolet Spectrograph
Authors: Keeney Brian A. , Stern S. Alan , Feldman Paul D. , A’Hearn Michael F. , Bertaux Jean-Loup , Feaga Lori M. , Knight Matthew M. , Medina Richard A. , Noonan John , Parker Joel Wm. , Pineau Jon P. , Schindhelm Rebecca N. , Steffl Andrew J. , Versteeg M. , Vervack Ronald J. , Weaver Harold A. 
Published: April 2019

Abstract
Following our previous detection of ubiquitous

and

absorption against the far-ultraviolet continuum of stars located near the nucleus of Comet 67P/Churyumov–Gerasimenko, we present a serendipitously observed stellar occultation that occurred on 2015 September 13, approximately one month after the comet’s perihelion passage. The occultation appears in two consecutive 10-minute spectral images obtained by Alice, Rosetta’s ultraviolet (700–2100 Å) spectrograph, both of which show

absorption with column density >1017.5 cm−2 and significant

absorption (

/

≈ 5%–10%). Because the projected distance from the star to the nucleus changes between exposures, our ability to study the

column density profile near the nucleus (impact parameters <1 km) is unmatched by our previous observations. We find that the

and

column densities decrease with increasing impact parameter, in accordance with expectations, but the

column decreases ∼3 times more quickly than

. When combined with previously published results from stellar appulses, we conclude that the

and

column densities are highly correlated, and

/

decreases with the increasing

column.
Studying the Evolution of Warm Dust Encircling BD +20 307 Using SOFIA
Authors: Thompson Maggie A. , Weinberger Alycia J. , Keller Luke D. , Arnold Jessica A. , Stark Christopher C. 
Published: April 2019

Abstract
The small class of known stars with unusually warm, dusty debris disks is a key sample to probe in order to understand cascade models and the extreme collisions that likely lead to the final configurations of planetary systems. Because of its extreme dustiness and small radius, the disk of BD +20 307 has a short predicted collision time and is therefore an interesting target in which to look for changes in dust quantity and composition over time. To compare with previous ground and Spitzer Space Telescope data, Stratospheric Observatory for Infrared Astronomy (SOFIA) photometry and spectroscopy were obtained. The system’s 8.8–12.5 μm infrared emission increased by 10 ± 2% over nine years between the SOFIA and earlier Spitzer measurements. In addition to an overall increase in infrared excess, there is a suggestion of a greater increase in flux at shorter wavelengths (less than 10.6 μm) compared to longer wavelengths (greater than 10.6 μm). Steady-state collisional cascade models cannot explain the increase in BD +20 307's disk flux over such short timescales. A catastrophic collision between planetary-scale bodies is still the most likely origin for the system’s extreme dust; however, the cause for its recent variation requires further investigation.
About the Kerr Nature of the Stellar-mass Black Hole in GRS 1915+105
Authors: Zhang Yuexin , Abdikamalov Askar B. , Ayzenberg Dimitry , Bambi Cosimo , Dauser Thomas , García Javier A. , Nampalliwar Sourabh 
Published: April 2019

Abstract
We employ the accretion disk reflection model relxill_nk to test the spacetime geometry around the stellar-mass black hole in GRS 1915+105. We adopt the Johannsen metric with the deformation parameters α
13 and α
22, for which the Kerr solution is recovered when α
13 = α
22 = 0. We analyze a NuSTAR observation of 2012, obtaining vanishing and non-vanishing values of the deformation parameters depending on the astrophysical model adopted. Similar difficulties were not found in our previous tests with other sources. The results of this work can shed light on the choice of sources suitable for testing the Kerr metric using X-ray reflection spectroscopy and on the parts of our reflection models that more urgently require improvement.
He+ Ions Comoving with the Solar Wind in the Outer Heliosphere
Authors: Swaczyna P. , McComas D. J. , Zirnstein E. J. 
Published: April 2019

Abstract
The solar wind emitted from the solar corona is a highly ionized plasma composed of electrons, protons, He2+ ions, and a small fraction of heavier ions. Additionally, interstellar neutral (ISN) atoms ionized in the heliosphere form populations of pickup ions (PUIs). The two most abundant PUIs are of H+ and He+. Some solar wind ions are neutralized due to charge exchange with ISN atoms. Besides the neutral solar wind created by this process, a population of He+ ions is formed from solar wind He2+ ions, with kinetic properties inherited from solar wind ions. The rate of production of these He+ ions increases significantly with solar wind speed. Consequently, in the fast solar wind, over 10% of solar wind He2+ turns into He+ along the path to the termination shock. There have been very few observations of this population so far. Here we show that observations from the Solar Wind Around Pluto (SWAP) instrument on New Horizons contain a signature of this population. Namely, solar wind He+ ions cause an enhanced flux just below the cutoff energy of H+ PUIs. We identify 17 daily spectra collected by SWAP with this feature during steady solar wind conditions. We find that the fit parameters of the H+ PUI model are considerably affected when the He+ ion population is significant. Moreover, we note that some of the observations are likely also affected by other heavy solar wind ions, e.g., oxygen and carbon.
A Catalog of OB Stars from LAMOST Spectroscopic Survey
Authors: Liu Zhicun , Cui Wenyuan , Liu Chao , Huang Yang , Zhao Gang , Zhang Bo 
Published: April 2019

Abstract
We present 22,901 OB spectra of 16,032 stars identified from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope data release 5 data set. A larger sample of OB candidates are first selected from the distributions in the spectral line indices’ space. Then, all 22,901 OB spectra are identified by manual inspection. Based on a subsample validation, we find that the completeness of the OB spectra reaches about 89 ± 22% for the stars with spectral types earlier than B7, while around 57 ± 16% B8–B9 stars are identified. The smaller completeness for late B stars will lead to the difficulty in discriminating them from A0–A1-type stars. The subclasses of the OB samples are determined using the software package MKCLASS. With a careful validation using 646 subsamples, we find that MKCLASS can give fairly reliable subtypes and luminosity classes for most of the OB stars. The uncertainty of the spectral subtype is around 1 subtype, and the uncertainty of the luminosity class is around 1 level. However, about 40% of the OB stars fail to be assigned to any class by MKCLASS, and a few spectra are significantly misclassified by MKCLASS. This is likely because the template spectra of MKCLASS are selected from nearby stars in the solar neighborhood, while the OB stars in this work are mostly located in the outer disk and may have lower metallicities. The rotation of the OB stars may also be responsible for the misclassifications. Moreover, we find that the spectral and luminosity classes of the OB stars located in the Galactic latitude larger than 20° are substantially different with those located in the latitude smaller than 20°, which may either be due to the observational selection effect or may hint a different origin of the high Galactic latitude OB stars.
Evaluating the current integrated pest management recommendations in Canada for carrot weevil (Coleoptera: Curculionidae) and carrot rust fly (Diptera: Psilidae)
Authors: Telfer Zachariah , Lemay Jason , McDonald Mary Ruth , Scott-Dupree Cynthia 
Published: April 2019

AbstractThe primary insect pests in Canadian carrot production are carrot rust fly (Psila rosae (Fabricius); Diptera: Psilidae) and carrot weevil (Listronotus oregonensis (LeConte); Coleoptera: Curculionidae). An integrated pest management programme for these pests exists in Québec and Ontario, where most Canadian carrot (Daucus carota subsp. sativus (Hoffmann) Schübler and Martens; Apiaceae) production occurs. As current carrot insect integrated pest management recommendations are decades old, laboratory and field trials were performed to evaluate the carrot insect integrated pest management recommendations. Carrot weevil populations were evaluated in the laboratory for resistance to the primary product used for control, phosmet. Ontario carrot weevils exhibited negligible mortality when exposed to phosmet compared with > 80% mortality in a susceptible strain. Using data from a carrot integrated pest management programme, weather data was correlated with monitoring and damage data of both pests from historical records. Increased carrot weevil captures were weakly related to increased damage. Carrot weevil damage was reduced by following integrated pest management recommendations in one of three trials. No strong relationship between weather and carrot rust fly captures was identified, suggesting the degree day model for carrot rust fly activity needs revision. In field trials, carrot rust fly damage was negligible despite integrated pest management recommendations for insecticide applications. Future research should include improving carrot weevil monitoring and control and increasing the carrot rust fly action threshold to optimise insecticide applications.
Aqueous reactions of organic triplet excited states with atmospheric alkenes
Authors: Kaur Richie , Hudson Brandi M. , Draper Joseph , Tantillo Dean J. , Anastasio Cort 
Published: April 2019

Abstract. Triplet excited states of organic matter are formed when colored organic
matter (i.e., brown carbon) absorbs light. While these “triplets” can be
important photooxidants in atmospheric drops and particles (e.g., they
rapidly oxidize phenols), very little is known about their reactivity toward
many classes of organic compounds in the atmosphere. Here we measure the
bimolecular rate constants of the triplet excited state of benzophenone
(3BP∗), a model species, with 17 water-soluble
C3–C6 alkenes that have either been found in the
atmosphere or are reasonable surrogates for identified species. Measured rate
constants (kALK+3BP∗) vary by a factor of 30 and are in the
range of (0.24–7.5) ×109 M−1 s−1. Biogenic alkenes
found in the atmosphere – e.g., cis-3-hexen-1-ol, cis-3-hexenyl acetate, and
methyl jasmonate – react rapidly, with rate constants above 1×109 M−1 s−1. Rate constants depend on alkene characteristics
such as the location of the double bond, stereochemistry, and alkyl
substitution on the double bond. There is a reasonable correlation between
kALK+3BP∗ and the calculated one-electron oxidation potential
(OP) of the alkenes (R2=0.58); in contrast, rate constants are not
correlated with bond dissociation enthalpies, bond dissociation free
energies, or computed energy barriers for hydrogen abstraction. Using the OP
relationship, we estimate aqueous rate constants for a number of unsaturated
isoprene and limonene oxidation products with 3BP∗: values are in
the range of (0.080–1.7) ×109 M−1 s−1, with
generally faster values for limonene products. Rate constants with less
reactive triplets, which are probably more environmentally relevant, are
likely roughly 25 times slower. Using our predicted rate constants, along
with values for other reactions from the literature, we conclude that
triplets are probably minor oxidants for isoprene- and limonene-related
compounds in cloudy or foggy atmospheres, except in cases in which the triplets
are very reactive.
Analysis of functional groups in atmospheric aerosols by infrared spectroscopy: systematic intercomparison of calibration methods for US measurement network samples
Authors: Reggente Matteo , Dillner Ann M. , Takahama Satoshi 
Published: April 2019

Abstract. Peak fitting (PF) and partial least
squares (PLS) regression have been independently developed for estimation of
functional groups (FGs) from Fourier transform infrared (FTIR) spectra of
ambient aerosol collected on Teflon filters. PF is a model that quantifies
the functional group composition of the ambient samples by fitting individual
Gaussian line shapes to the aerosol spectra. PLS is a data-driven,
statistical model calibrated to laboratory standards of relevant compounds
and then extrapolated to ambient spectra. In this work, we compare the FG
quantification using the most widely used implementations of PF and PLS,
including their model parameters, and also perform a comparison when the
underlying laboratory standards and spectral processing are harmonized. We
evaluate the quantification of organic FGs (alcohol COH, carboxylic
COOH, alkane CH, carbonyl CO) and ammonium, using external
measurements (organic carbon (OC) measured by thermal optical reflectance
(TOR) and ammonium by balance of sulfate and nitrate measured by ion
chromatography). We evaluate our predictions using 794 samples collected in
the Interagency Monitoring of PROtected Visual Environments (IMPROVE) network
(USA) in 2011 and 238 laboratory standards from Ruthenburg et al. (2014)
(available at https://doi.org/10.1016/j.atmosenv.2013.12.034). Each model shows
different biases. Overall, estimates of OC by FTIR show high correlation with
TOR OC. However, PLS applied to unprocessed (raw spectra) appears to
underpredict oxygenated functional groups in rural samples, while other
models appear to underestimate aliphatic CH bonds and OC in urban samples. It
is possible to adjust model parameters (absorption coefficients for PF and
number of latent variables for PLS) within limits consistent with calibration
data to reduce these biases, but this analysis reveals that further progress
in parameter selection is required. In addition, we find that the influence
of scattering and anomalous transmittance of infrared in coarse particle
samples can lead to predictions of OC by FTIR which are inconsistent with TOR
OC. We also find through several means that most of the quantified carbonyl
is likely associated with carboxylic groups rather than ketones or esters. In
evaluating state-of-the-art methods for FG abundance by FTIR, we suggest
directions for future research.
Sox9+ messenger cells orchestrate large-scale skeletal regeneration in the mammalian rib
Authors: Kuwahara Stephanie T , Serowoky Maxwell A , Vakhshori Venus , Tripuraneni Nikita , Hegde Neel V , Lieberman Jay R , Crump J Gage , Mariani Francesca V 
Published: April 2019

Most bones in mammals display a limited capacity for natural large-scale repair. The ribs are a notable exception, yet the source of their remarkable regenerative ability remains unknown. Here, we identify a Sox9-expressing periosteal subpopulation that orchestrates large-scale regeneration of murine rib bones. Deletion of the obligate Hedgehog co-receptor, Smoothened, in Sox9-expressing cells prior to injury results in a near-complete loss of callus formation and rib bone regeneration. In contrast to its role in development, Hedgehog signaling is dispensable for the proliferative expansion of callus cells in response to injury. Instead, Sox9-positive lineage cells require Hh signaling to stimulate neighboring cells to differentiate via an unknown signal into a skeletal cell type with dual chondrocyte/osteoblast properties. This type of callus cell may be critical for bridging large bone injuries. Thus despite contributing to only a subset of callus cells, Sox9-positive progenitors play a major role in orchestrating large-scale bone regeneration.Editorial note: This article has been through an editorial process in which the authors decide how to respond to the issues raised during peer review. The Reviewing Editor's assessment is that all the issues have been addressed (<xref ref-type="decision-letter" rid="SA1">see decision letter</xref>).
Edição Temática “Cidades inteligentes: planejamento e gestão da sustentabilidade”
Authors: Kniess Cláudia Terezinha 
Published: April 2019

É com satisfação que apresentamos a edição temática da revista Gestão e Secretariado – Revista GeSec - com foco em “Cidades inteligentes: planejamento e gestão da sustentabilidade”. Os estudos nesta temática respondem a uma forte demanda da sociedade para o enfrentamento dos desafios atuais relacionados à crescente concentração da população nos centros urbanos e à diversidade de problemas técnicos e políticos relacionados a esta dinâmica. A revista GeSeC é classificada como Qualis B1 na área de avaliação da Capes Planejamento Urbano Regional/Demografia e consolida-se nesta edição como um importante meio para divulgação e discussão de trabalhos científicos que contribuem com o avanço do desenvolvimento urbano sustentável. Ressalta-se que a revista GeSeC está inserida em bases indexadoras nacionais e internacionais, a saber: Redalyc; Cengage Gale Learning; DOAJ; Proquest; Ebsco Host e Web of Science Core Collection.
Microbiological and Physicochemical Characteristic of Degrading Palm (Elaeis guineensis) Kernel and Cashew (Anacardium occidental) Nut Oils
Authors: Olanrewaju Ariyo Dokun , Adetutu Ayodele Bosede , Adeyinka Fasusi Oluwaseun 
Published: April 2019

Aim: For vegetable oil produce in Nigeria to be competitive in the international market and suitable for downstream applications. The Microbiological and Physicochemical Characteristic of oils are amongst the most important properties that must be studied.
Study Design: The study is design to isolate and identify microorganisms involved in degradation of palm kernel and cashew nut oils and to investigate the physicochemical characteristics of the oil samples during storage.
Place and Duration of Study: The study was conducted between April and September, 2015 at the Microbiology Laboratory of the Federal University of Technology, Akure, Ondo State, Nigeria.
Methodology: Palm kernel and cashew nut seeds were purchased from Oja Oba, Akure, Ondo State. Palm kernel and cashew nut oils were extracted using n-hexane by Soxhlet extractor. The oil samples were stored at room temperature (25°C ± 1) for three months. Microorganisms were isolated from the oil and identified every two weeks of storage. The effect of storage on the physicochemical characteristics (saponification value, peroxide value, acid value and specific gravity) of the oil samples was determined every two weeks of storage.
Results: The microbial profile of the associated organisms consists of Bacillus licheniformis, Staphylococcus aureus, Articosporium inflate, Aspergillus flavus, A. saprophyticus and Penicllium notatum. All the physicochemical parameters determined were increasing with time except the moisture content. Saponification values (SV) obtained for the palm kernel oil samples is 300 mgKOH/g and cashew oil is 400 mgKOH/g while no significant change was observed in the specific gravity of both oils.
Conclusion: The microbial load of the oil sample was low and the physicochemical property is evidence that the oil can be useful in production of soap and cosmetics.
Effect of Municipal Solid Waste Compost, Farm Yard Manure, Inorganic Fertilizers and Their Combinations on Potato Yield in Wolmera District, Ethiopia
Authors: Tafesse Shiferaw , Leta Seyoum 
Published: April 2019

The study was conducted in Wolmera district of Oromia Regional State, Ethiopia. The main research objective was to evaluate the effect of municipal solid waste compost on potato yield in comparison to inorganic fertilizers and farm yard manure and combined applications. The experimental design was a factorial in randomized complete block design (RCBD) with three replications. The treatments were: i) combination of diammonium phosphate (97.5 kg/ha), urea (82.5 kg/ha) and municipal solid waste compost (10,000 kg/ha), ii) combination of diammonium phosphate (97.5 kg/ha), urea (82.5 kg/ha) and farm yard manure (10,000 kg/ha), iii) diammonium phosphate (195k g/ha) and urea (165 kg/ha), iv) farm yard manure (20,000 kg/ha), v) municipal solid waste compost (20,000 kg/ha), and vi) control. The findings of the research indicated that the combination of municipal solid waste compost and inorganic fertilizers resulted in the highest total tuber yield and total marketable yield, 18.2±0.7 ton/ha and 17.8±0.7 ton/ha, respectively, with 149% relative marketable yield advantage over control. Sole application of municipal solid waste compost was also resulted in significant (P=.05) potato yield increment compared to the control. It resulted in an increase of marketable potato tuber yield advantage of 52% over the control with total marketable yield of 10.9±0.9 ton/ha. Hence, combined use of municipal solid waste compost and inorganic fertilizers may be a promising option for poor potato farmers around the City of Addis Ababa.
Clinical significance of soluble adhesion molecules in anti‐NMDAR encephalitis patients
Authors: Ding Yuewen , Yang Chengjia , Zhou Zheyi , Peng Yu , Chen Jinyu , Pan Suyue , Xu Hong , Cai Yuping , Ou Kaiyun , Xie Wei , Wang Honghao 
Published: April 2019

AbstractIncreasing evidence indicates that immune system dysfunction affects anti‐N‐methyl‐D‐aspartate receptor (NMDAR) encephalitis. This study aims to investigate the relationship between adhesion molecules and the pathophysiology in anti‐NMDAR encephalitis. Soluble forms of Intercellular adhesion molecule‐1 (sICAM‐1), vascular adhesion molecule‐1 (sVCAM‐1), and L‐selectin (sL‐selectin), were measured in the CSF and serum of 26 participants with anti‐NMDAR encephalitis, 11 patients with schizophrenia and 22 patients with noninflammatory disorders. CSF levels of sICAM‐1, sVCAM‐1 and sL‐selectin were significantly elevated in the anti‐NMDAR encephalitis group. sVCAM‐1 levels were positively associated with modified Rankin scale score in anti‐NMDAR encephalitis patients at the onset and 3‐month follow‐up.