bluuebunny/crossref_metadata_2025_split huggingface dataset:
ANALISIS PENERAPAN SISTEM INFORMASI AKADEMIK (SIAKAD) DALAM UPAYA PENINGKATAN KINERJA PELAYANAN ADMINISTRASI AKADEMIK DI UNIVERSITAS SINGAPERBANGSA KARAWANG
Authors: Absi Ani Rahmawati , Isyanto Puji , Sulaeman Eman 
Published: December 2019

ABSTRACT
The aim of research to analyze policies, implementation, performance of academic administrative services, efforts Stakeholders in the supervision of management information systems academic administrative services, and the impact of academic information system (SIAKAD) in an effort to improve the performance of the academic administration at the University Singaperbangsa Karawang.
The thesis is expected to contribute to the bearers of economics in particular; application of academic information system (SIAKAD), Human Resource Management, Information Systems Management, and economics in general. This study uses a qualitative approach to data collection techniques are observation, interviews and in-depth interviews. The results were analyzed by comparing answers interviews with expert informants Judgment and create Conclusions and Recommendations.
From the analysis of research data, be concluded as follows: 1) Policy management Singaperbangsa University Karawang already exists and has been referred to the Higher Education regulations only require better oversight again. 2) University Singaperbangsa Karawang already implementing integrated SIAKAD but still partial. 3) Performance of academic administrative services at the University of Singaperbangsa Karawang good enough after their SIAKAD. 4) Efforts Stakeholders in the supervision of the University Singaperbangsa SIAKAD in Karawang enough and needs to be increased again. 5) The impact of the application of SIAKAD enough to affect the performance of academic administrative services at the University Singaperbangsa Karawang.
Furthermore, the sustainability of recommendation; SOP has been given by the Higher Education dilakuka timely and well as impact on the Quality of Higher Education. Network of SIAKAD needs to be improved. Rules Regulations of Higher Education also greatly affect the performance improvement of the service provider and academic administration. About Integration of reporting systems in each Prodi needs to be implemented immediately. Hopefully, by the Decree of the Rector of the University of Singaperbangsa Karawang to consider remuneration as a reward from the important task.

Keywords: Application, Academic Information Systems, Service Performance.
Convection-aided Explosions in One-dimensional Core-collapse Supernova Simulations. I. Technique and Validation
Authors: Mabanta Quintin A. , Murphy Jeremiah W. , Dolence Joshua C. 
Published: December 2019

Abstract
Most one-dimensional core-collapse simulations fail to explode, yet multidimensional simulations often explode. A dominant multidimensional effect aiding explosion is neutrino-driven convection. We incorporate a convection model in approximate one-dimensional core-collapse supernova (CCSN) simulations. This is the 1D+ method. This convection model lowers the neutrino luminosity required for explosion by

%, similar to the reduction observed in multidimensional simulations. The model is based upon the global turbulence model of Mabanta & Murphy and models the mean-field turbulent flow of neutrino-driven convection. In this preliminary investigation, we use simple neutrino heating and cooling algorithms to compare the critical condition in the 1D+ simulations with the critical condition observed in two-dimensional simulations. Qualitatively, the critical conditions in the 1D+ and the two-dimensional simulations are similar. The assumptions in the convection model affect the radial profiles of density, entropy, and temperature, and comparisons with the profiles of three-dimensional simulations will help to calibrate these assumptions. These 1D+ simulations are consistent with the profiles and explosion conditions of equivalent two-dimensional CCSN simulations but are ∼102 times faster, and the 1D+ prescription has the potential to be ∼105 faster than three-dimensional CCSN simulations. With further calibration, the 1D+ technique could be ideally suited to test the explodability of thousands of progenitor models.
Constraining the Emission Geometry and Mass of the White Dwarf Pulsar AR Sco Using the Rotating Vector Model
Authors: Plessis Louis du , Wadiasingh Zorawar , Venter Christo , Harding Alice K. 
Published: December 2019

Abstract
We apply the standard radio pulsar rotating vector model to the white dwarf (WD) pulsar AR Sco’s optical polarization position angle swings folded at the WD’s spin period as obtained by Buckley et al. Owing to the long duty cycle of spin pulsations with a good signal-to-noise ratio over the entire spin phase, in contrast to neutron star radio pulsars, we find well-constrained values for the magnetic obliquity α and observer viewing direction ζ with respect to the spin axis. We find

and

, implying an orthogonal rotator with an observer angle

. This orthogonal nature of the rotator is consistent with the optical light curve consisting of two pulses per spin period, separated by 180° in phase. Under the assumption that ζ ≈ i, where i is the orbital inclination, and that the companion M star is Roche-lobe-filling, we obtain

for the WD mass. These polarization modeling results suggest the that nonthermal emission arises from a dipolar WD magnetosphere and close to the star, with synchrotron radiation (if nonzero pitch angles can be maintained) being the plausible loss mechanism, marking AR Sco as an exceptional system for future theoretical and observational study.
Tying Spatial Variations in Polycyclic Aromatic Hydrocarbon (PAH) Emission to a Changing PAH Population in the Reflection Nebula NGC 2023
Authors: Zang R. X. , Peeters E. , Boersma C. 
Published: December 2019

Abstract
The PAH emission in Spitzer-IRS spectral maps of the reflection nebula NGC 2023 have been previously studied using a Gaussian decomposition method for the 7–9 μm region and a database-fitting approach. Both studies provided insight into the spatial-spectral evolution of the PAH population and related them to changing local physical conditions. This study investigates whether the database-fitting technique provides insight into the PAH populations at the origin of the four Gaussian components. To this end, clustered PAH species maps and spectra are generated from the database-fitting results using spectral clustering utilizing the Structural Similarity Index as an affinity measure. The application of spectral clustering solely based on spatial structure is strongly dependent on the anatomy of the considered regions and is unable to align specific morphological features with a PAH population characterized by a single distinct property. However, in the south FOV the projected distance from the star of the peak emission in a cluster map correlates with the PAH cation fraction and the cluster dominated by small PAHs is confined to the S and SSE ridges, consistent with results from Knight et al. Furthermore, the cluster and Gaussian maps exhibit limited morphological similarity and the 7–9 μm cluster spectra do not show consistent overlap with any of the Gaussian components. However, the relative strengths of the Gaussian components strongly correlate with the PAH ionization parameter as determined from the database-fitting approach. This lends further support to the existence of at least two sub-populations contributing to the 7–9 μm PAH emission.
Is the SNR HESS J1731-347 Colliding with Molecular Clouds?
Authors: Cui Yudong , Yang Ruizhi , He Xinbo , Tam P. H. Thomas , Pühlhofer Gerd 
Published: December 2019

Abstract
The supernova remnant HESS J1731-347 is a young supernova remnant (SNR) that displays a nonthermal X-ray and TeV shell structure. A molecular cloud at a distance of ∼3.2 kpc is spatially coincident with the western part of the SNR, and it was likely hit by the SNR. The X-ray emission from this part of the shell is much lower than from the rest of the SNR. Moreover, a compact GeV emission region coincident with the cloud has been detected with a soft spectrum. These observations seem to imply a shock-cloud collision scenario at this area, where the stalled shock can no longer accelerate super-TeV electrons or maintain strong magnetic turbulence downstream, while the GeV cosmic rays (CRs) are released through this stalled shock. To test this hypothesis, we have performed a detailed Fermi-LAT reanalysis of the HESS J1731-347 region with over nine years of data. Two distinct GeV components are found, one displaying a soft spectrum is from the compact GeV emission region, the other one displaying a hard spectrum is from the rest of the SNR (excluding the cloud region). A hadronic model involving a shock-cloud collision scenario is built to explain the γ-ray emission from this area. It consists of three CR sources: run-away super-TeV CRs that have escaped from the fast shock, leaked GeV CRs from the stalled shock, and the local CR sea. The X-ray and γ-ray emission of the SNR excluding the shock-cloud interaction region is explained in a one-zone leptonic model. Our shock-cloud collision model explains the GeV–TeV observations from the clouds around HESS J1731-347, i.e., a cloud in contact with the SNR and a distant cloud in spatial coincidence to the TeV source HESS J1729-345. We find however that the leaked GeV CRs from the shock-cloud collision do not necessarily dominate the GeV emission from the clouds, due to a comparable contribution from the local CR sea.
Modeling Collisional Excitation of [O i] Fine Structure Line Emission from PDRs. I. Homogeneous Clouds
Authors: Goldsmith Paul F. 
Published: December 2019

Abstract
Atomic oxygen (O0) plays a critical role in determining the structure of photon-dominated regions (PDRs), but reliable modeling of its emission has been hampered by the high optical depth of the 63 μm fine structure line and complexities in the excitation of the relevant fine structure levels. We discuss here radiation produced by collisional excitation of the submillimeter fine structure lines of atomic oxygen ([O I]) using recent calculations of rates for collisions with atomic and molecular hydrogen. We employ the Molpop–CEP code to include the effects of optical thickness in slab models that are characterized by uniform oxygen abundance, hydrogen density, and kinetic temperature. The particular spontaneous decay rates and collisional excitation rates connecting the three O0 fine structure levels result in population inversion of the upper, 145 μm transition. The effects of trapping are rigorously included and are reflected in the resulting line profiles that exhibit prominent self-absorption even with uniform physical conditions. We present figures for analyzing the two fine structure lines based on the intensity of the 63 μm line and the 145 μm/63 μm line ratio. For the clouds considered, the results for line intensities and line ratios are modestly different from those obtained with a large-velocity-gradient model, but the ability to calculate line profiles is an additional powerful tool. Comparison of the model results with observed line profiles suggests that cloud models with varying physical conditions are required to optimally utilize [O I] fine structure line emission to trace the energetics of PDR regions and the feedback from massive, young stars.
Extension of lifespan of graphite in fuel blocks of high-temperature gas-cooled reactors as the resource for ensuring design values of nuclear fuel burn-up
Authors: Bulakh Olga I. , Kostylev Oleg K. , Nesterov Vladimir N. , Cherdizov Eldar K. 
Published: December 2019

High-temperature gas-cooled reactor (HTGR) is one of promising candidates for new generation of nuclear power reactors. This type of nuclear reactor is characterized with the following principal features: highly efficient generation of electricity (thermal efficiency of about 50%); the use of high-temperature heat in different production processes; reactor core self-protection properties; practical exclusion of reactor core meltdown in case of accidents; the possibility of implementation of various nuclear fuel cycle options; reduced radiation and thermal effects on the environment, forecasted acceptability of financial performance with respect to cost of electricity as compared with alternative energy sources.
The range of output coolant temperatures in high-temperature reactors within the limits of 750–950 °C predetermines the use of graphite as the structural material of the reactor core and helium as the inert coolant. Application of graphite ensures higher heat capacity of the reactor core and its practical non-meltability.
Residence time of reactor graphite depends on the critical value of fluence of damaging neutrons (neutrons with energies above 180 keV). In its turn, the value of critical neutron fluence is determined by the irradiation temperature and flux density of accompanying gamma-radiation. The values of critical fluence for graphite decrease within high-temperature region of 800–1000 °C to 1·1022 – 2·1021 cm–2, respectively. The compactness of the core results in the increase of the fracture of damaging neutrons in the total flux. These circumstances predetermine relatively low values of lifespan of graphite structures in high-temperature reactors.
Design features and operational parameters of GT-MHR high-temperature gas-cooled reactor are described in the present paper. Results of neutronics calculations allowing determining the values of damaging neutron flux, nuclear fuel burnup and expired lifespan of graphite of fuel blocks were obtained. The mismatch between positions of the maxima in the dependences of fuel burnup and exhausted lifespan of graphite in fuel blocks along the core height is demonstrated.
The map and methodology for re-shuffling fuel blocks of the GT-MHR reactor core were developed as the result of analysis of the calculated data for ensuring the matching between the design value of the fuel burnup and expected total graphite lifespan.
OH chemistry of non-methane organic gases (NMOGs) emitted from laboratory and ambient biomass burning smoke: evaluating the influence of furans and oxygenated aromatics on ozone and secondary NMOG formation
Authors: Coggon Matthew M. , Lim Christopher Y. , Koss Abigail R. , Sekimoto Kanako , Yuan Bin , Gilman Jessica B. , Hagan David H. , Selimovic Vanessa , Zarzana Kyle J. , Brown Steven S. , Roberts James M. , Müller Markus , Yokelson Robert , Wisthaler Armin , Krechmer Jordan E. , Jimenez Jose L. , Cappa Christopher , Kroll Jesse H. , de Gouw Joost , Warneke Carsten 
Published: December 2019

Abstract. Chamber oxidation experiments conducted at the Fire Sciences Laboratory in 2016 are evaluated to identify important chemical processes contributing to the hydroxy radical (OH) chemistry of biomass burning non-methane organic gases (NMOGs). Based on the decay of primary carbon measured by proton transfer reaction time-of-flight mass spectrometry (PTR-ToF-MS), it is confirmed that furans and oxygenated aromatics are among the NMOGs emitted from western United States fuel types with the highest reactivities towards OH. The oxidation processes and formation of secondary NMOG masses measured by PTR-ToF-MS and iodide-clustering time-of-flight chemical ionization mass spectrometry (I-CIMS) is interpreted using a box model employing a modified version of the Master Chemical Mechanism (v. 3.3.1) that includes the OH oxidation of furan, 2-methylfuran, 2,5-dimethylfuran, furfural, 5-methylfurfural, and guaiacol. The model supports the assignment of major PTR-ToF-MS and I-CIMS signals to a series of anhydrides and hydroxy furanones formed primarily through furan chemistry. This mechanism is applied to a Lagrangian box model used previously to model a real biomass burning plume. The customized mechanism reproduces the decay of furans and oxygenated aromatics and the formation of secondary NMOGs, such as maleic anhydride. Based on model simulations conducted with and without furans, it is estimated that furans contributed up to 10 % of ozone and over 90 % of maleic anhydride formed within the first 4 h of oxidation. It is shown that maleic anhydride is present in a biomass burning plume transported over several days, which demonstrates the utility of anhydrides as markers for aged biomass burning plumes.
The impact of fluctuations and correlations in droplet growth by collision–coalescence revisited – Part 2: Observational evidence of gel formation in warm clouds
Authors: Alfonso Lester , Raga Graciela B. , Baumgardner Darrel 
Published: December 2019

Abstract. In recent papers (Alfonso et al., 2013; Alfonso and Raga, 2017) the sol–gel
transition was proposed as a mechanism for the formation of large droplets
required to trigger warm rain development in cumulus clouds. In the context
of cloud physics, gelation can be interpreted as the formation of the
“lucky droplet” that grows by accretion of smaller droplets at a much
faster rate than the rest of the population and becomes the embryo for
raindrops. However, all the results in this area have been theoretical or
simulation studies. The aim of this paper is to find some observational
evidence of gel formation in clouds by analyzing the distribution of the
largest droplet at an early stage of cloud formation and to show that the
mass of the gel (largest drop) is a mixture of a Gaussian distribution and a Gumbel
distribution, in accordance with the pseudo-critical clustering scenario
described in Gruyer et al. (2013) for nuclear multi-fragmentation.
Long-term trends in the ionospheric response to solar extreme-ultraviolet variations
Authors: Vaishnav Rajesh , Jacobi Christoph , Berdermann Jens 
Published: December 2019

Abstract. The thermosphere–ionosphere system shows high complexity due to its interaction with the continuously varying solar radiation flux. We investigate the temporal and spatial response of the ionosphere to solar activity using 18 years (1999–2017) of total electron content (TEC) maps provided by the international global navigation satellite systems service and 12 solar proxies (F10.7, F1.8, F3.2, F8, F15, F30, He II, Mg II index, Ly-α, Ca II K, daily sunspot area (SSA), and sunspot number (SSN)). Cross-wavelet and Lomb–Scargle periodogram (LSP) analyses are used to evaluate the different solar proxies with respect to their impact on the global mean TEC (GTEC), which is important for improved ionosphere modeling and forecasts. A 16 to 32 d periodicity in all the solar proxies and GTEC has been identified. The maximum correlation at this timescale is observed between the He II, Mg II, and F30 indices and GTEC, with an effective time delay of about 1 d. The LSP analysis shows that the most dominant period is 27 d, which is owing to the mean solar rotation, followed by a 45 d periodicity. In addition, a semi-annual and an annual variation were observed in GTEC, with the strongest correlation near the equatorial region where a time delay of about 1–2 d exists. The wavelet variance estimation method is used to find the variance of GTEC and F10.7 during the maxima of the solar cycles SC 23 and SC 24. Wavelet variance estimation suggests that the GTEC variance is highest for the seasonal timescale (32 to 64 d period) followed by the 16 to 32 d period, similar to the F10.7 index. The variance during SC 23 is larger than during SC 24. The most suitable proxy to represent solar activity at the timescales of 16 to 32 d and 32 to 64 d is He II. The Mg II index, Ly-α, and F30 may be placed second as these indices show the strongest correlation with GTEC, but there are some differences in correlation during solar maximum and minimum years, as the behavior of proxies is not always the same. The indices F1.8 and daily SSA are of limited use to represent the solar impact on GTEC. The empirical orthogonal function (EOF) analysis of the TEC data shows that the first EOF component captures more than 86 % of the variance, and the first three EOF components explain 99 % of the total variance. EOF analysis suggests that the first component is associated with the solar flux and the third EOF component captures the geomagnetic activity as well as the remaining part of EOF1. The EOF2 captures 11 % of the total variability and demonstrates the hemispheric asymmetry.
Virtual Reality in China: Is There a Sustainable Business Model for Virtual Reality Content Enterprises?
Authors: Shan Yu 
Published: December 2019

Abstract
This paper provides a micro-perspective on the business activity of VR content production in China’s digital creative industries. It is based on two case studies in the form of semi-structured interviews with the founders of Pinta studios and Sandman studios. Questions concerning the development of sustainable VR content production in China are raised. This article employs the framework of business model canvas (BMC) to describe and analyse business models by exploring the dynamics and initiatives of VR content enterprises from 2016 to 2019. Research with Chinese VR content enterprises provides an opportunity to rethink many of the opportunities and challenges confronting Chinese VR content creators as they seek to implement this disruptive technology to engage consumers and adapt to the huge market in the future. Based on fieldwork research for these two case studies, exploring the dynamics and initiatives in the process of VR content production in China, the article finds that the need for specific and sustainable business models for VR enterprises represents a significant challenge. The paper concludes with some comments on the acquisition of ‘open literacy’, this time at enterprise level.
The Mining of Craft: An exploration of Minecraft as a Community of Inquiry
Authors: Miller Liam 
Published: December 2019

Abstract
Reading and Writing in any domain, whether it is law, rap songs, academic essays, superhero comics, or whatever, are not just ways of decoding print, they are also caught up with ways of doing things, thinking about things, valuing things, and interacting with other people – that is, they are caught up with different sorts of social practices. (Gee 2007, p. 18)
Reading and Writing, for James Gee, is how we engage with any knowledge community; what he calls a semiotic domain (2007). Our level of literacy in a given domain amounts to how well we can read (understand) and write (convey) the knowledge that the domain values. Education is all about teaching the student how to read and write. However, we read and write with much more than just pens and paper. Our literacy covers how we engage and interact within our domain of knowledge.
In the following paper I will explore these ideas of reading and writing within the domain of Minecraft. I will use the educational theory of John Dewey to show how the community of Minecraft creates its own knowledge community, and how its members learn to read and write.
Gestión administrativa deportiva caso de estudio: liga mayor de fútbol salvadoreña
Authors: Tovar Diego 
Published: December 2019

“El deporte es demasiado juego para ser negocio y demasiado negocio para ser un juego”, esta es una frase que se extrae del libro “Principles and practice of Sport Management” (Masteralexis, Barr y Hums), y que sin duda describe de una manera muy exacta le realidad no solo del fútbol, sino que del deporte en general.En este artículo se presenta la situación actual del fútbol salvadoreño, desde una óptica administrativa-deportiva, con el objetivo de identificar oportunidades y áreas deficitarias, y de esta manera apuntar a investigaciones más profundas en el corto plazo. Para la realización de este articulo se ha tomado como baseinvestigaciones realizadas a través del aula, trabajos de graduación, textos relacionados al deporte y recientes comunicación salvadoreños.
Realidad Empresarial No. 8, 2019: 46-50