bluuebunny/crossref_metadata_2025_split huggingface dataset:
Prediksi Kelulusan Mata Kuliah Menggunakan Hybrid Fuzzy Inference System
Authors: Izzah Abidatul , Widyastuti Ratna 
Published: August 2017

AbstrakPerguruan Tinggi merupakan salah satu institusi yang menyimpan data yang sangat informatif jika diolah secara baik. Prediksi kelulusan mahasiswa merupakan kasus di Perguruan Tinggi yang cukup banyak diteliti. Dengan mengetahui prediksi status kelulusan mahasiswa di tengah semester, dosen dapat mengantisipasi atau memberi perhatian khusus pada siswa yang diprediksi tidak lulus. Metode yang digunakan sangat bervariatif termasuk metode Fuzzy Inference System (FIS). Namun dalam implementasinya, proses pembangkitan rule fuzzy sering dilakukan secara random atau berdasarkan pemahaman pakar sehingga tidak merepresentasikan sebaran data. Oleh karena itu, dalam penelitian ini digunakan teknik Decision Tree (DT) untuk membangkitkan rule. Dari uraian tersebut, penelitian bertujuan untuk memprediksi kelulusan mata kuliah menggunakan hybrid FIS dan DT. Data yang digunakan dalam penelitian ini adalah data nilai Posttest, Tugas, Kuis, dan UTS dari 106 mahasiswa Politeknik Kediri pengikut mata kuliah Algoritma dan Struktur Data. Penelitian ini diawali dari membangkitkan 5 rule yang selanjutnya digunakan dalam inferensi. Tahap selanjutnya adalah implementasi FIS dengan tahapan fuzzifikasi, inferensi, dan defuzzifikasi. Hasil yang diperoleh adalah akurasi, sensitivitas, dan spesifisitas masing-masing adalah 94.33%, 96.55%, dan 84.21%.Kata kunci: Decision Tree, Educational Data Mining, Fuzzy Inference System, Prediksi. AbstractCollege is an institution that holds very informative data if it mined properly. Prediction about student’s graduation is a common case that many discussed. Having the predictions of student’s graduation in the middle semester, lecturer will anticipate or give some special attention to students who would be not passed. The method used to prediction is very varied including Fuzzy Inference System (FIS). However, fuzzy rule process is often generated randomly or based on knowledge experts that not represent the data distribution. Therefore, in this study, we used a Decision Tree (DT) technique for generate the rules. So, the research aims to predict courses graduation using hybrid FIS and DT. Dataset used is the posttest score, tasks score, quizzes score, and middle test score from 106 students of the Polytechnic Kediri who took Algorithms and Data Structures. The research started by generating 5 rules by decision tree. The next is implementation of FIS that consist of fuzzification, inference, and defuzzification. The results show that the classifier give a good result in an accuracy, sensitivity, and specificity respectively was 94.33%, 96.55% and 84.21%.Keywords: Decision Tree, Educational Data Mining, Fuzzy Inference System, Prediction.
Effects of Sintering Temperature and Time on the Properties of Al-Cu PM Alloy
Authors: Gökçe A. , Findik F. , Kurt A. O. 
Published: August 2017

Abstract
Aluminium-based powder metallurgy (PM) alloys have a number of advantages over cast and wrought aluminium alloys. These PM alloys can be produced using either prealloyed or elemental premixes, with the latter offering a longer die life because of their softer nature compared with prealloyed powders. It is found that the use of an Al-Cu premixed PM alloy gives green density values higher than those of Al-Cu prealloyed systems reported in the literature. Most commercial aluminium PM alloys and alloy developments are based on the Al4Cu system. The amount of liquid phase has significant effects on the microstructure and the mechanical properties of sintered products. Lack of a liquid phase results in inadequate mechanical properties, while an excess of liquid phase causes distortion and shape deformation of the compacts formed by sintering. The objective of this study is to determine the properties of an Al4Cu PM alloy produced using an elemental premix. The effects of the amount of liquid phase on microstructural features and mechanical properties are assessed through thermal analyses. It is found that the optimum transverse rupture strength is obtained by sintering at 600 °C for 2 h.
Effect of Welding Parameters on Microstructure and Tensile Strength of Friction Stir Welded PA 6,6 Joints
Authors: Nandhini R. , Moorthy M. Kesava , Muthukumaran S. 
Published: August 2017

Abstract
This paper deals with the work done on friction stir welding of thermoplastic material PA 6,6. A specially designed welding tool was used for this polymer. The major process parameters like tool rotational speed, feed rate were varied to understand the physical changes of the polymer and to carry out characterization studies. In this study, an attempt was made to optimize the process parameters by using L9 orthogonal array approach. ANOVA analysis was used to explore the effect of process parameters. Tensile testing was performed to analyze the joint strength. Thus, in new exploration of using polyamide 6,6 as base material, a maximum joint strength of 37 MPa has been achieved. Optimum combination of process parameters were found by using ANOVA studies. Microstructure of the friction stir welded joints using scanning electron microscopy was done. The X-ray diffraction and the thermogravimetric analysis were done to determine the degree of crystallinity and the level of degradation of the friction stir welded joints.
Investigations on Tightness of Polymer-Metal Hybrids in Environments with Thermal, Media, and Mechanical Loads
Authors: Geck J.-M. , Jarka S. , Heim H.-P. 
Published: August 2017

Abstract
With polymer-metal hybrids becoming more commonly used as structural components it was investigated how they perform in complex environments with combined thermal, media, and mechanical loads. Special attention was put on media tightness under said loads. This paper sums up the activities of the polymer technology research group of the University of Kassel on hybrids produced by overmolding metal inserts. Investigations concerning joint strength and influence of (cyclic) temperature loads and chemical corrosion on media tightness of the joint were undertaken with different polymer-metal hybrid specimen geometries (simple and complex). In order to enhance adhesion and joint strength, different bonding agents and adhesives were used in the experiments. It could be shown that all joints of polymer-metal hybrids lost their tightness after being exposed to temperature ranges from 30 to +150°C due to their highly different thermal expansion behavior. An elastomeric intermediate layer of certain minimum thickness in order to compensate the relative movement of plastic and metal and thus maintain integrity of the joint regardless of temperatures is proposed.
In Silico Study of Polymer Sheet Drying Process
Authors: Bisotti F. , Licordari F. , Rossi F. , Masi M. 
Published: August 2017

Abstract
In the last decades polymer sheets have been developed and used for various purposes, for example with electronic devices or solar cells. After polymer processing, they present a high residue of polymer solvent that should be reduced. Indeed, a high presence of solvent could affect their electrical properties or cause high levels of pollution. In addition, uncontrolled drying process can cause bubble formation with consequent film breakage. The aim of this work is to simplify the phenomena involved in the drying process in order to develop a mathematical model able to predict the time evolution of the composition and the mass of the polymer sheet. The model proposed here, therefore, is aimed at stimulating the industrial process and the results were verified against experimental data collected with cellulose acetate-based polymeric sheets. In addition, thanks to its simplicity and to the very low system requirements and central processing unit (CPU) time, our model gives immediate views of the system behavior.
Mathematical Modeling of Electrically Charged Viscoelastic Jet
Authors: Samiee M. , Rafizadeh M. 
Published: August 2017

Abstract
In this project we performed a theoretical study of the electrospinning process. The electrospinning process typically consists of two phases. For the first part, we have studied Feng's model (2003) and used Phan-Thien Tanner (PTT) rheological model instead of Giesekus model which was used by Feng. A theoretical model for the jet is derived by using a thin filament approximation, and the resulting differential equations are solved numerically. For the second part of the jet, the basis of the modeling is the bead-spring approach first proposed by Reneker et al. (2000) and we added the evaporation effect to Reneker's model. The three dimensional equations describing the dynamics of the bending of electrospun jets are derived and the calculated behavior is compared with experimental observations of jets.
Mathematical Modelling of Vibration Response Characteristics for Dissimilar Hot Plate Welded Polyamide 6 Composite Beams
Authors: Kara M. , Öztoprak N. , Seçgin A. , Sayer S. , Yeni Ç. E. 
Published: August 2017

Abstract
This study is concerned with the mathematical modelling of the vibration response characteristic of a special dissimilar composite beam based on experimental modal analysis. Here, experimental modal analyses of three different dissimilar polyamide 6 composite beams, which are connected to each other by hot plate welding are performed. The measured natural frequencies are compared with finite element predictions for verification purposes. Modal information obtained by experiments is used to construct a mathematical model representing vibration response characteristic of beams by applying multi degree of freedom curve fitting method. The model showing modal characteristics of dissimilar beams is now ready to be used in different kinds of excitations to predict the frequency response of vibration.
Discovery of a Rapid, Luminous Nova in NGC 300 by the KMTNet Supernova Program
Authors: Antoniadis John , Moon Dae-Sik , Ni Yuan Qi , Kim Dong-Jin , Lee Yongseok , Neilson Hilding 
Published: August 2017

Abstract
We present the discovery of a rapidly evolving transient by the Korean Microlensing Telescope Network Supernova Program (KSP). KSP is a novel high-cadence supernova survey that offers deep (∼21.5 mag in BV
I bands), nearly continuous wide-field monitoring for the discovery of early and/or fast optical transients. KSP-OT-201509a, reported here, was discovered on 2015 September 27 during the KSP commissioning run in the direction of the nearby galaxy NGC 300, and stayed above detection limit for ∼22 days. We use our BV
I light curves to constrain the ascent rate, −3.7(7) mag day−1 in V, decay timescale,

days, and peak absolute magnitude,

mag. We also find evidence for a short-lived pre-maximum halt in all bands. The peak luminosity and light-curve evolution make KSP-OT-201509a consistent with a bright, rapidly decaying nova outburst. We discuss constraints on the nature of the progenitor and its environment using archival Hubble Space Telescope (HST)/ACS images and conclude with a broad discussion on the nature of the system.
Discovery of a Group of Receding, Variable Halo Stars toward Norma
Authors: Chakrabarti Sukanya , Angeloni Rodolfo , Freeman Kenneth , Sargent Benjamin , Simon Joshua D. , Konorski Piotr , Gieren Wolfgang , Sesar Branimir , Lipnicky Andrew , Blitz Leo , Basri Gibor , Vacca William , Marengo Massimo , Guhathakurta Puragra , Quillen Alice , Chang Philip 
Published: August 2017

Abstract
We present results from spectroscopic observations of a trio of Cepheid candidates identified from K

s
-band light curves toward Norma. The spectra show that these stars are moving with a large and similar radial velocity—the heliocentric velocities are 171 ± 32 km s−1, 164 ± 37 km s−1, and 173 ± 20 km s−1. The average radial velocity is ∼169 km s−1, which is large and distinct from typical stars in the Galaxy’s stellar disk. Given the radial velocities and associated 1σ error, we find that the combined probability that these three stars are foreground Milky Way disk stars is ∼7 × 10−4%, and the probability that these are large-amplitude spotted stars in a binary is ∼10−5%. These objects at l ∼ 333° and b ∼ −1° are therefore associated with the stellar halo. The identification of these sources as Type I Cepheids is not certain, and thus the distances of these sources are not yet well established. Assuming the 3.6 μm period–luminosity relation of Type I Cepheids gives a distance of ∼78 kpc for these sources.
Attenuation Modified by DIG and Dust as Seen in M31
Authors: Tomičić Neven , Kreckel Kathryn , Groves Brent , Schinnerer Eva , Sandstrom Karin , Kapala Maria , Blanc Guillermo A. , Leroy Adam 
Published: August 2017

Abstract
The spatial distribution of dust in galaxies affects the global attenuation, and hence inferred properties, of galaxies. We trace the spatial distribution of dust in five approximately kiloparsec fields of M31 by comparing optical attenuation with the total dust mass distribution. We measure the attenuation from the Balmer decrement using Integral Field Spectroscopy and the dust mass from Herschel far-IR observations. Our results show that M31's dust attenuation closely follows a foreground screen model, contrary to what was previously found in other nearby galaxies. By smoothing the M31 data, we find that spatial resolution is not the cause for this difference. Based on the emission-line ratios and two simple models, we conclude that previous models of dust/gas geometry need to include a weakly or non-attenuated diffuse ionized gas (DIG) component. Due to the variation of dust and DIG scale heights with galactic radius, we conclude that different locations in galaxies will have different vertical distributions of gas and dust and therefore different measured attenuation. The difference between our result in M31 with that found in other nearby galaxies can be explained by our fields in M31 lying at larger galactic radii than the previous studies that focused on the centers of galaxies.
On the Energetics of the
Reaction and Some Astrochemical Implications
Authors: Savin D. W. , Bhaskar R. G. , Vissapragada S. , Urbain X. 
Published: August 2017

Abstract
We explore the energetics of the titular reaction, which current astrochemical databases consider to be open at typical dense molecular (i.e., dark) cloud conditions. As is common for reactions involving the transfer of light particles, we assume that there are no intersystem crossings of the potential energy surfaces involved. In the absence of any such crossings, we find that this reaction is endoergic and will be suppressed at dark cloud temperatures. Updating accordingly a generic astrochemical model for dark clouds changes the predicted gas-phase abundances of 224 species by greater than a factor of 2. Of these species, 43 have been observed in the interstellar medium. Our findings demonstrate the astrochemical importance of determining the role of intersystem crossings, if any, in the titular reaction.
Stellar Stream Candidates in the Solar Neighborhood Found in the LAMOST DR3 and TGAS
Authors: Liang X. L. , Zhao J. K. , Oswalt T. D. , Chen Y. Q. , Zhang L. , Zhao G. 
Published: August 2017

Abstract
We have cross-matched the LAMOST DR3 with the Gaia DR1 TGAS catalogs and obtained a sample of 166,827 stars with reliable kinematics. A technique based on the wavelet transform was applied to detect significant overdensities in velocity space among five subsamples divided by spatial position. In total, 16 significant overdensities of stars with very similar kinematics were identified. Among these, four are new stream candidates and the rest are previously known groups. Both the U–V velocity and metallicity distributions of the local sample show a clear gap between the Hercules structure and the Hyades–Pleiades structure. The U–V positions of these peaks shift with the spatial position. Following a description of our analysis, we speculate on possible origins of our stream candidates.
A Likely Redback Millisecond Pulsar Counterpart of 3FGL J0838.8-2829
Authors: Halpern J. P. , Strader J. , Li M. 
Published: August 2017

Abstract
We obtained new optical observations of the X-ray source XMMU J083850.38−282756.8, the previously proposed counterpart of the γ-ray source 3FGL J0838.8−2829. Time-series photometry in the

band reveals periodic modulation of

mag that is characteristic of the heating of the photosphere of a low-mass companion star by a compact object. The measured orbital period is 5.14817 ± 0.00012 hr. The shape of the light curve is variable, evidently due to the effects of flaring and asymmetric heating. Spectroscopy reveals a companion of type M1 or later, having a radial velocity amplitude of 315 ± 17 km s−1, with period and phasing consistent with the heating interpretation. The mass function of the compact object is

, which allows a neutron star in a high-inclination orbit. Variable, broad Hα emission is seen, which is probably associated with a wind from the companion. These properties, as well as the X-ray and γ-ray luminosities at the inferred distance of

, are consistent with a redback millisecond pulsar in its non-accreting state. A search for radio pulsations is needed to confirm this interpretation and derive complete system parameters for modeling, although absorption by the ionized wind could hinder such detection.
Individual Dynamical Masses of Ultracool Dwarfs*

†
‡
Authors: Dupuy Trent J. , Liu Michael C. 
Published: August 2017

Abstract
We present the full results of our decade-long astrometric monitoring programs targeting 31 ultracool binaries with component spectral types M7–T5. Joint analysis of resolved imaging from Keck Observatory and Hubble Space Telescope and unresolved astrometry from CFHT/WIRCam yields parallactic distances for all systems, robust orbit determinations for 23 systems, and photocenter orbits for 19 systems. As a result, we measure 38 precise individual masses spanning 30–115

. We determine a model-independent substellar boundary that is ≈70

in mass (≈L4 in spectral type), and we validate Baraffe et al. evolutionary model predictions for the lithium-depletion boundary (60

at field ages). Assuming each binary is coeval, we test models of the substellar mass–luminosity relation and find that in the L/T transition, only the Saumon & Marley “hybrid” models accounting for cloud clearing match our data. We derive a precise, mass-calibrated spectral type–effective temperature relation covering 1100–2800 K. Our masses enable a novel direct determination of the age distribution of field brown dwarfs spanning L4–T5 and 30–70

. We determine a median age of 1.3 Gyr, and our population synthesis modeling indicates our sample is consistent with a constant star formation history modulated by dynamical heating in the Galactic disk. We discover two triple-brown-dwarf systems, the first with directly measured masses and eccentricities. We examine the eccentricity distribution, carefully considering biases and completeness, and find that low-eccentricity orbits are significantly more common among ultracool binaries than solar-type binaries, possibly indicating the early influence of long-lived dissipative gas disks. Overall, this work represents a major advance in the empirical view of very low-mass stars and brown dwarfs.
Correlation Investigation of Radio and Optical Variations in a Large Sample of Fermi Blazars
Authors: Zhang B. K. , Zhao X. Y. , Zhang L. , Dai B. Z. 
Published: August 2017

Abstract
We have performed a correlation analysis of radio and optical variations in a large sample of Fermi blazars, of which there are 36 flat spectrum radio quasars and 34 BL Lacertae objects. The discrete cross-correlation function (DCF) method has been employed to investigate the correlation and the possible time lag. A clear correlation has been found in 55 sources (78.6% of the sample sources). It is confirmed that the variations in optical bands lead those in radio bands by several days to several hundred days. In four cases, optical flares are found to occur simultaneously with the radio flares. A jet-in-shock model has been used to explain these results. We estimate that the lag between the radio and optical bands may range from 3 days to 2.4 years. The DCF analysis results are consistent with expectations.
Proposed Core Set of Items for Measuring Disease Activity in Systemic Juvenile Idiopathic Arthritis
Authors: Limenis Elizaveta , Feldman Brian M. , Achonu Camille , Batthish Michelle , Lang Bianca , Mclimont Marjorie , Ota Sylvia , Ramanan Athimalaipet , Scuccimarri Rosie , Young Nancy L. , Schneider Rayfel 
Published: August 2017

Objective.To date, there are no standardized disease activity tools for systemic juvenile idiopathic arthritis (sJIA). We developed a core set of disease activity measures for sJIA.Methods.We conducted a validation study in patients with sJIA recruited from 3 Canadian institutions. Disease activity scores were based on questionnaires, clinical factors, and laboratory measures. The physician’s global assessment was our criterion standard. We determined the strength of association of each item with the criterion standard. We then surveyed international experts to determine the top 10 items. Finally, we used the experts’ responses to generate a proposed core set of disease activity measures.Results.We enrolled 57 subjects — 26 with moderately or severely active disease, and 31 with mildly active or inactive disease. Items that most strongly correlated with the criterion standard were number of active joints (r = 0.79), parent’s global assessment of disease activity (r = 0.53), erythrocyte sedimentation rate (ESR; r = 0.62), and C-reactive protein (CRP; r = 0.61). The response rate from international experts was 82% (154/187). Items with the most votes, in descending order, were number of active joints, number of days with fever in the preceding 2 weeks, patient’s and parent’s global assessments of disease activity, sJIA rash, ESR, CRP, and hemoglobin level.Conclusion.We propose a core set of items for measuring disease activity in sJIA. Future research should be aimed at further validation of this core set in the international context.
Comment être aesh ?
Authors: Maraquin Carine 
Published: August 2017

L’école en France s’est donné un moyen humain important pour favoriser l’inclusion des enfants en situation de handicap : la création d’accompagnants d’élèves en situation de handicap, relais des avs (Auxiliaires de vie scolaire). Malgré le souhait et la démarche, officiels, de reconnaître cette mission comme un métier, les difficultés techniques et de posture sont nombreuses face aux attentes énormes de la part des familles, des écoles et des professionnels du champ du handicap. Leur confier cette responsabilité de l’inclusion ne peut suffire à désinsulariser le handicap et les laisserait esseulés et sans garde-fous.
Comment une institution s’explique à elle-même
Authors: Grimaud Lin 
Published: August 2017

Le sens qu’une institution peut prendre exige un récit qui la situe comme représentative du système culturel auquel elle appartient. Le mythe fonctionnaliste dominant les sociétés modernes met les travailleurs sociaux dans une position subjective paradoxale. Ainsi le travail social aurait à traiter ce par quoi il est lui-même affecté : l’affaiblissement de la capacité à mettre en récit ce qui fonde une existence à l’articulation de l’individu et du collectif. Pour mettre en perspective le mythe fondateur du travail social laïc en France, je me suis intéressé à l’institution de l’État providence après la Libération.