bluuebunny/crossref_metadata_2025_split huggingface dataset:
UPAYA MENINGKATKAN MINAT BELAJAR SISWA MENGGUNAKAN MEDIA PEMBELAJARAN MATEMATIKA BERBASIS E-LEARNING PADA POKOK BAHASAN TRIGONOMETRI
Authors: Hasibuan Nur Haminah , Hasibuan Erwina Azizah , Nasution Alvi Sahrin 
Published: November 2021

Penelitian ini adalah penelitian tindandakan kelas (Classroom Action Research), yaitu merupakan sebuah penelitian yang dilakukan oleh guru dikelasnya sendiri dengan merancang, melaksanakan, dan merefleksikan tindakan secara kolaboratif dan pastisipasif dengan tujuan untuk memperbaiki kinerja sebagai guru sehingga hasil belajar siswa meningkat. Adapun yang menjadi subjek dalam penelitian ini adalah siswa kelas X TkJ 1 SMK N 1 Batang Angkola Tahun Pelajaran 2020/2021 yang terdiri dari 30 orang siswa. Sedangkan objek dari penelitian ini adalah kemampuan meningkatkan hasil bejar siswa dalam menyelesaikan persoalan matematika, meningkatakan minat belajar siswa dan kemampuan guru mengelola pembelajaran melalui media e-learning. Hal ini dilihat dari hasil observasi siswa pada siklus I diperoleh persentase 56,3% dengan kategori “Baik ,selanjutnya persentase observasi siswa siklus II sebesar 75,56% dengan kategori “Sangat Baik”.2)Kemampuan hasil belajar siswa dalam pembelajaran matematika melalui media berbasise-learning siswa kelas X SMK N 1 Batang Angkola pada materi Trigonometri tahun pelajaran 2020/2021. Hal ini dapat ditunjukkan dengan persentase hasil tes belajar siswa matematika yaitu 43% dengan kategori “Cukup” pada siklus I menjadi 86% dengan kategori “Baik” pada siklus II.3)Kemampuan guru dalam mengelola pembelajaran dengan menggunakan metode e-learning pada pokok bahasan Trigonometri di kelas X SMK N 1 Batang Angkola tahun pelajaran 2020/2021. Hal ini dilihat dari hasil observasi kemampuan guru dalam mengelola pembelajaran pada siklus I memperoleh persentase 83.33% dengan kategori “Baik” menjadi 95,83% dengan kategori “Sangat Baik” pada siklus II.
PENGARUH MOTIVASI DAN MINAT TERHADAP HASIL BELAJAR MATEMATIKA PADA POKOK BAHASAN PERSAMAAN LINEAR SATU VARIABEL PADA SISWA KELAS VII SMP NEGERI 9 PADANGSIDIMPUAN
Authors: Novita Sitompul Yanti , Arifin Mohd. , Nurdalilah Nurdalilah 
Published: November 2021

Pengaruh Motivasi dan Minat Terhadap Hasil Belajar Matematika Pada Pokok Bahasan Persamaan Liniear Satu Variabel Pada siswa kelas VII SMP Negeri 9 Padangsidimpuan. Salah satu yang harus ditumbuhkembangkan dalam pembelajaran matematika adalah motivasi dan minat belajar siswa, karena motivasi dan minat belajar mempunyai peranan yang penting dalam menentukan keberhasilan siswa. Penelitian ini ditujukan untuk mengetahui adakah pengaruh motivasi dan minat belajar siswa terhadap hasil belajar pada pokok bahasan persamaan liniear satu variabel. Populasi dalam penelitian ini adalah adalah siswa kelas VII SMP Negeri 9 Padangsidimpuan, dengan jumlah kelas VII sebanyak 8 kelas. Pada penelitian ini sampel diambil dari populasi dengan teknik Cluster Random Sampling yaitu penelitin mengambil sampelnya berdasarkan daerah populasi yang telah ditetapkan. Jumlah sampel adalah 32 siswa. Metode pengumpulan data yang digunakan pada penelitian ini adalah metode kuisioner dan dokumentasi. Untuk analisis data akhir menggunakan Regresi Linier ganda. Hasil Penelitian diperoleh persamaan estimasi regresi linier ganda untuk semua siswaadalah = 39 + 0,79 + 1,02 dengan koefisien korelasi parsial sebesar 0,490, menunjukkan adanya hubungan antara motivasi siswa terhadap hasil belajar matematika. Nilai koefisien korelasi positif menunjukkan bahwa hubungan antara motivasi dan hasil belajar searah. Koefisien korelasi parsial sebesar 0,293, ini menunjukkan adanya hubungan antara minat siswa terhadap hasil belajar matematika. Nilai koefisien korelasi positif menunjukkan bahwa hubungan antara minat dan hasil belajar searah. Setelah koefisien korelasi parsial diuji keberartiannya, ternyata kedua koefisien berarti, artinya hubungan antara motivasi siswa dengan hasil belajar matematika jika minat tetap adalah signifikan.
Exploring the Solar System with the NOIRLab Source Catalog I: Detecting Objects with CANFind
Authors: Fasbender Katie M. , Nidever David L. 
Published: November 2021

Abstract
Despite extensive searches and the relative proximity of solar system objects (SSOs) to Earth, many remain undiscovered and there is still much to learn about their properties and interactions. This work is the first in a series dedicated to detecting and analyzing SSOs in the all-sky NOIRLab Source Catalog (NSC). We search the first data release of the NSC with CANFind, a Computationally Automated NSC tracklet Finder. NSC DR1 contains 34 billion measurements of 2.9 billion unique objects, which CANFind categorizes as belonging to “stationary” (distant stars, galaxies) or moving (SSOs) objects via an iterative clustering method. Detections of stationary bodies for proper-motion μ ≤ 2.″5 hr−1 (0.°017 day−1) are identified and analyzed separately. Remaining detections belonging to high-μ objects are clustered together over single nights to form “tracklets.” Each tracklet contains detections of an individual moving object, and is validated based on spatial linearity and motion through time. Proper motions are then calculated and used to connect tracklets and other unassociated measurements over multiple nights by predicting their locations at common times, forming “tracks.” This method extracted 527,055 tracklets from NSC DR1 in an area covering 29,971 square degrees of the sky. The data show distinct groups of objects with similar observed μ in ecliptic coordinates, namely Main Belt Asteroids, Jupiter Trojans, and Kuiper Belt Objects. Apparent magnitudes range from 10 to 25 mag in the ugrizY and VR bands. Color–color diagrams show a bimodality of tracklets between primarily carbonaceous and siliceous groups, supporting prior studies.
A General Origin for Multiplanetary Systems With Significantly Misaligned USP Planets
Authors: Brefka L. , Becker J. C. 
Published: November 2021

Abstract
Ultra-short-period (USP) planets are exoplanets that have orbital periods of less than one day and are unique because they orbit inside the nominal magnetic truncation gap of their host stars. In some cases, USP planets have also been observed to exhibit unique dynamical parameters such as significant misalignments in inclination angle with respect to nearby planets. In this paper, we explore how the geometry of a multiplanet system hosting a USP planet can be expected to evolve as a star ages. In particular, we explore the relationship between the mutual inclination of the USP planet and the quadrupole moment (J
2) of the host star. We use secular perturbation theory to predict the past evolution of the example TOI-125 system, and then confirm the validity of our results using long-term N-body simulations. Through investigating how the misalignment between the candidate USP planet and the three other short-period planets in the TOI-125 system arose, we intend to derive a better understanding of the population of systems with misaligned USP planets and how their observed parameters can be explained in the context of their dynamical histories.
Unexpected Short-period Variability in Dwarf Carbon Stars from the Zwicky Transient Facility
Authors: Roulston Benjamin R. , Green Paul J. , Toonen Silvia , Hermes J. J. 
Published: November 2021

Abstract
Dwarf carbon (dC) stars, main-sequence stars showing carbon molecular bands, are enriched by mass transfer from a previous asymptotic-giant-branch (AGB) companion, which has since evolved to a white dwarf. While previous studies have found radial-velocity variations for large samples of dCs, there are still relatively few dC orbital periods in the literature and no dC eclipsing binaries have yet been found. Here, we analyze photometric light curves from DR5 of the Zwicky Transient Facility for a sample of 944 dC stars. From these light curves, we identify 34 periodically variable dC stars. Remarkably, of the periodic dCs, 82% have periods less than two days. We also provide spectroscopic follow-up for four of these periodic systems, measuring radial velocity variations in three of them. Short-period dCs are almost certainly post-common-envelope binary systems, because the periodicity is most likely related to the orbital period, with tidally locked rotation and photometric modulation on the dC either from spots or from ellipsoidal variations. We discuss evolutionary scenarios that these binaries may have taken to accrete sufficient C-rich material while avoiding truncation of the thermally pulsing AGB phase needed to provide such material in the first place. We compare these dCs to common-envelope models to show that dC stars probably cannot accrete enough C-rich material during the common-envelope phase, suggesting another mechanism like wind-Roche lobe overflow is necessary. The periodic dCs in this paper represent a prime sample for spectroscopic follow-up and for comparison to future models of wind-Roche lobe overflow mass transfer.
Ultra-High-energy Cosmic Rays from beyond the Greisen–Zatsepin–Kuz’min Horizon
Authors: Owen Ellis R. , Han Qin , Wu Kinwah , Yap Y. X. Jane , Surajbali Pooja 
Published: November 2021

Abstract
Ultra-high-energy (UHE) cosmic rays (CRs) of energies ∼(1018–1020) eV, accelerated in violent astrophysical environments, interact with cosmic background radiation fields via photo-hadronic processes, leading to strong attenuation. Typically, the Universe would become “opaque” to UHE CRs after several tens of megaparsecs, setting the boundary of the Greisen–Zatsepin–Kuz’min (GZK) horizon. In this work, we investigate the contribution of sources beyond the conventional GZK horizon to the UHE CR flux observed on Earth, when photospallation of the heavy nuclear CRs is taken into account. We demonstrate that this contribution is substantial, despite the strong attenuation of UHE CRs. A significant consequence is the emergence of an isotropic background component in the observed flux of UHE CRs, coexisting with the anisotropic foreground component that is associated with nearby sources. Multi-particle CR horizons, which evolve over redshift, are determined by the CR nuclear composition. Thus, they are dependent on the source populations and source evolutionary histories.
Galaxy Stellar Mass Functions from z ∼ 10 to z ∼ 6 using the Deepest Spitzer/Infrared Array Camera Data: No Significant Evolution in the Stellar-to-halo Mass Ratio of Galaxies in the First Gigayear of Cosmic Time
Authors: Stefanon Mauro , Bouwens Rychard J. , Labbé Ivo , Illingworth Garth D. , Gonzalez Valentino , Oesch Pascal A. 
Published: November 2021

Abstract
We present new stellar mass functions at z ∼ 6, z ∼ 7, z ∼ 8, z ∼ 9 and, for the first time, z ∼ 10, constructed from ∼800 Lyman-break galaxies previously identified over the eXtreme Deep Field and Hubble Ultra-Deep Field parallel fields and the five Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey fields. Our study is distinctive due to (1) the much deeper (∼200 hr) wide-area Spitzer/Infrared Array Camera (IRAC) imaging at 3.6 μm and 4.5 μm from the Great Observatories Origins Deep Survey Re-ionization Era Wide-area Treasury from Spitzer program (GREATS) and (2) consideration of z ∼ 6–10 sources over a 3× larger area than those of previous Hubble Space Telescope+Spitzer studies. The Spitzer/IRAC data enable ≥2σ rest-frame optical detections for an unprecedented 50% of galaxies down to a stellar mass limit of

∼

10

8



⊙

across all redshifts. Schechter fits to our volume densities suggest a combined evolution in the characteristic mass



*

and normalization factor ϕ
* between z ∼ 6 and z ∼ 8. The stellar mass density (SMD) increases by ∼1000× in the ∼500 Myr between z ∼ 10 and z ∼ 6, with indications of a steeper evolution between z ∼ 10 and z ∼ 8, similar to the previously reported trend of the star formation rate density. Strikingly, abundance matching to the Bolshoi–Planck simulation indicates halo mass densities evolving at approximately the same rate as the SMD between z ∼ 10 and z ∼ 4. Our results show that the stellar-to-halo mass ratios, a proxy for the star formation efficiency, do not change significantly over the huge stellar mass buildup occurred from z ∼ 10 to z ∼ 6, indicating that the assembly of stellar mass closely mirrors the buildup in halo mass in the first ∼1 Gyr of cosmic history. The James Webb Space Telescope is poised to extend these results into the “first galaxy” epoch at z ≳ 10.
Galactic Extinction: How Many Novae Does It Hide and How Does It Affect the Galactic Nova Rate?
Authors: Kawash A. , Chomiuk L. , Rodriguez J. A. , Strader J. , Sokolovsky K. V. , Aydi E. , Kochanek C. S. , Stanek K. Z. , Mukai K. , De K. , Shappee B. , Holoien T. W.-S. , Prieto J. L. , Thompson T. A. 
Published: November 2021

Abstract
There is a long-standing discrepancy between the observed Galactic classical nova rate of ∼10 yr−1 and the predicted rate from Galactic models of ∼30–50 yr−1. One explanation for this discrepancy is that many novae are hidden by interstellar extinction, but the degree to which dust can obscure novae is poorly constrained. We use newly available all-sky three-dimensional dust maps to compare the brightness and spatial distribution of known novae to that predicted from relatively simple models in which novae trace Galactic stellar mass. We find that only half (53%) of the novae are expected to be easily detectable (g ≲ 15) with current all-sky optical surveys such as the All-Sky Automated Survey for Supernovae (ASAS-SN). This fraction is much lower than previously estimated, showing that dust does substantially affect nova detection in the optical. By comparing complementary survey results from the ASAS-SN, OGLE-IV, and Palomar Gattini IR surveys using our modeling, we find a tentative Galactic nova rate of ∼30 yr−1, though this could be as high as ∼40 yr−1, depending on the assumed distribution of novae within the Galaxy. These preliminary estimates will be improved in future work through more sophisticated modeling of nova detection in ASAS-SN and other surveys.
Late Afterglow Bump/Plateau around the Jet Break: Signature of a Free-to-shocked Wind Environment in Gamma-Ray Burst
Authors: Li Xiao-Yan , Lin Da-Bin , Ren Jia , Hou Shu-Jin , Li Yu-Fei , Wang Xiang-Gao , Liang En-Wei 
Published: November 2021

Abstract
A number of gamma-ray bursts (GRBs) exhibit the simultaneous bumps in their optical and X-ray afterglows around the jet break. These bumps are similar to the afterglows of GRB 170817A, except preceded by a long shallow decay. Its origin is unclear. We suggest that these late simultaneous bumps may sound a transition of circumburst environment from a free-wind medium to a constant density medium, e.g., the shocked-wind medium. In this paper, we study the emission of an external-forward shock propagating in a free-to-shocked wind environment at different viewing angles. The late simultaneous bumps/plateaux followed by a steep decay are found in the optical and X-ray afterglows for high-viewing-angle observers. In addition, these theoretical bumps are preceded by a long plateau or shallow decay, which is formed during the external-forward shock propagating in the free-wind environment. For low-viewing-angle observers, the above bumps also appear but only in the situation where the structured jet has a low characteristic angle and the deceleration radius of the in-core jet flow is at around or beyond the free-wind boundary. We search GRBs for afterglows with the late simultaneous optical and X-ray bumps followed by a steep decay. GRBs 120326A, 100901A, 100814A, and 120404A are obtained. We find that an off-core (in-core) observed external-forward shock in a free-to-shocked wind environment can well explain the optical and X-ray afterglows in GRBs 120326A, 100901A, and 100814A (GRB 120404A).
A Spectroscopic Study of Supernova Remnants with the Infrared Space Observatory*
Authors: Millard Matthew J. , Ravi Aravind P. , Rho Jeonghee , Park Sangwook 
Published: November 2021

Abstract
We present far-infrared (FIR) spectroscopy of supernova remnants (SNRs) based on the archival data of the Infrared Space Observatory taken with the Long Wavelength Spectrometer (LWS). Our sample includes previously unpublished profiles of line and continuum spectra for 20 SNRs in the Galaxy and Magellanic Clouds. In several SNRs including G21.5–0.9, G29.7–0.3, the Crab Nebula, and G320.4–1.2, we find evidence for broad [O i], [O iii], [N ii], and [C ii] lines with velocity dispersions up to a few 103 km s−1, indicating that they are associated with high-velocity SN ejecta. Our detection of Doppler-broadened atomic emission lines and a bright FIR continuum hints at the presence of newly formed dust in SN ejecta. For G320.4–1.2, we present the first estimate of an ejecta-dust mass of 0.1–0.2 M
⊙, which spatially coincides with the broad-line emission, by applying a blackbody model fit with components of the SNR and background emission. Our sample includes raster maps of 63 μm, 145 μm [O i], and 158 μm [C ii] lines toward SNRs Kes 79, CTB 109, and IC 443. Based on these line intensities, we suggest interacting shock types in these SNRs. Finally, we compare our LWS spectra of our sample SNRs with the spectra of several H ii regions, and discuss their FIR line intensity ratios and continuum properties. Follow-up observations with modern instruments (e.g., JWST and SOFIA) with higher spatial and spectral resolution are encouraged for an extensive study of the SN ejecta and the SN dust.
Professionnalisation empêchée et bénévolisation du travail des tuteurs de service civique
Authors: Ihaddadene Florence 
Published: November 2021

L’accompagnement des volontaires en service civique est présenté comme une plus-value du dispositif, véritable contrepartie à leur engagement quasi gratuit. Or, ce « tutorat » est confié à de jeunes femmes salariées, souvent recrutées parmi les anciennes volontaires. La mission, faiblement prescrite, repose alors sur leur implication personnelle. À partir d’une enquête ethnographique de quatre ans et de l’analyse de 20 entretiens avec des tuteurs et tutrices, l’article propose d’analyser la bénévolisation du travail des tuteurs et tutrices, à l’aune de ses effets sur leur professionnalisation. L’« éthique du proche », qui sous-tend la politique de l’accompagnement, encourage une relation individualisée et bénévole. Ce travail assigné aux femmes est prétexte à une négation de leur qualification professionnelle.
A Prototype of a Robot Capable of Tracking Anyone with a High Body Temperature in Crowded Areas
Authors: Chaari Mohamed Zied , Aljaberi Abdulaziz 
Published: November 2021

People's health and the world economy around worldwide are under the impact of the virus. Controlling the propagation of coronavirus is extraordinarily challenging after the seventeen months since the pandemic outbreak. This research will represent the efficiency of robots in helping humanity in facing the Corona pandemic and the global health crisis. According to the quick and widespread Covid-19 contagion globally, healthcare service demand increased staff with less availability. In this crisis, robotics is the safe solution at a low price to support people to fight Covid-19.Furthermore, it is essential to relax lockdown restrictions after the increase in the number of people vaccinated. In this context, we designed a mobile robot with a thermal temperature scanner for pedestrians and identified those with abnormal temperatures over 39°C in public places and track them in real time. This robot features a long-lasting, lightweight battery and a high-quality thermal camera. Our primary target is to reduce the risk of transmission between people. We use a single-board computer and a thermal camera to detect unusual fevers near real-time to achieve this design and prototyping. In addition, we use image processing to detect target pedestrians and a control system to guide the robot. This robot can bypass any potential obstacles that can prevent it from moving around and cause problems. The development of this robot mainly focuses on the real-time measurement of body temperature at a distance of two meters. The compensation algorithm can coordinate between the mechanical parts of the robot and high-efficiency design.
Public Communication Practices and Beliefs Among Conservation Scientists and Practitioners
Authors: Kohl Patrice A. , Warner Sarah E. 
Published: November 2021

AbstractPublic communication is increasingly recognized as a key component in successful natural resource management within government agencies responsible for conservation. However, communication practices and beliefs among government conservation scientists and practitioners are not well studied or understood. Herein, we present the results of a communication survey disseminated to U.S. Fish and Wildlife Service employees working for the agency's Ecological Services program, a program charged with endangered species recovery. We asked respondents about public communication practices and beliefs, and factors that may motivate or discourage participation in public communication activities. Study respondents reported the lowest levels of participation in media-related, one-way communication activities, including writing educational materials and answering media inquiries. Respondents reported most frequently engaging in one-on-one communication with stakeholders. Although our results suggest that respondents engage in frequent communication with stakeholders, our results also suggest that they mostly communicate with stakeholders remotely, and especially by email, rather than in person. Furthermore, only 36% reported that they go out of their way to visit people in communities. On the other hand, a majority agreed that they learn new things about species and landscapes (80%) from conversations with stakeholders and often use this knowledge to solve conservation problems (89%). With respect to factors that encourage and discourage participation, 93% of respondents indicated that a desire to produce better conservation outcomes motivates them to communicate with stakeholders and the public. Many agreed that a lack of time was an obstacle to participating in public communication (68%), but an even larger majority (86%) indicated that public unfamiliarity with the U.S. Fish and Wildlife Service presented a barrier to public communication. Similarly, a majority of employees agreed that public and stakeholder unfamiliarity with themselves and their work also presented a communication barrier (62%). Our findings suggest that agencies responsible for conservation may want to assess whether the agency and its employees adequately invest in communication activities that foster public familiarity.
Rationalisme communicationnel et rationalisme critique : la place de la philosophie habermassienne dans la pensée éducative contemporaine
Authors: Firode Alain 
Published: November 2021

Pour penser le cadre philosophique de leur réflexion, les pédagogues contemporains s’appuient fréquemment sur la théorie du « rationalisme communicationnel » développée par Jürgen Habermas. Quoiqu’il y soit rarement fait référence dans la littérature pédagogique contemporaine, le « rationalisme critique » de Karl Popper constitue une autre tentative pour redonner sens, par-delà les critiques de l’universalisme des Lumières par les auteurs du XXe siècle, au rationalisme et à ses valeurs. De là l’objectif de cette étude, qui est de confronter, sous l’angle de leurs enjeux pédagogiques, ces deux modèles concurrents du « rationalisme ». L’objectif final étant, au travers de cette confrontation, de discuter quelques-uns des problèmes, concernant la formation du sujet rationnel, qui se posent à la réflexion contemporaine sur l’éducation.