bluuebunny/crossref_metadata_2025_split huggingface dataset:
STUDI DESKRIPSI TENTANG TINGKAT KESULITAN BELAJAR SISWA KELAS VIII DI SMP NEGERI 50 BATAM
Authors: Putri Mahrani D , Marpaung Junierissa 
Published: February 2019

Belajar adalah suatu proses usaha yang dilakukan untuk memperoleh suatu perubahan tingkah laku. Perwujudan perubahan tingkah laku hasil belajar seperti adanya peningkatan kemampuan siswa sesuai dengan tujuan yang telah ditetapkan. Realitanya masih ada siswa yang mengalami hambatan dalam proses belajar. Berdasarkan survei awal, rata-rata siswa memiliki nilai di bawah KKM yaitu 75 dan terdapat siswa yang mengalami hambatan dalam proses belajar. Tujuan penelitian ini adalah untuk mengetahui tingkat kesulitan belajar siswa. Penelitian ini dilaksanakan menggunakan metode kuantitatif dengan jenis penelitian deskriptif. Adapun yang menjadi populasi dalam penelitian adalah siswa kelas VIII dengan jumlah siswa 214 siswa. Teknik pengambilan sampel yang digunakan oleh peneliti adalah proportional random sampling. Dengan teknik tersebut, maka jumlah sampel yang diambil adalah 140 orang siswa. Alat pengumpulan data yang digunakan adalah angket kesulitan belajar. Analisis data menggunakan tingkat persentase. Berdasarkan hasil analisis data dan pembahasan dari hasil penelitian, maka dapat disimpulkan bahwa: Tingkat kesulitan belajar siswa kelas VIII di SMP Negeri 50 Batam dengan hasil 43,60% dari 140 siswa termasuk dalam kategori sedang. Adapun klasifikasi kesulitan belajar tertinggi yang di alami oleh siswa kelas VIII di SMP Negeri 50 Batam adalah terdapat pada klasifikasi kesulitan belajar memory disorder dengan persentase 42%. Sedangkan klasifikasi kesulitan belajar terendah sebesar 43% dalam klasifikasi menghitung. Disarankan siswa untuk membuat jadwal belajar, membaca sebelum memulai pelajaran, mengerjakan setiap tugas yang diberikan guru, dan meningkatkan semangat belajar.
A DISCOURSE HISTORICAL ANALYSIS ON LOCAL CULTURE IN THE FIRST BOOK TRILOGY “RONGGENG DUKUH PARUK” OF AHMAD TOHARI
Authors: Sugiharti Sri 
Published: February 2019

Local culture is commonly used to characterize the experience of everyday life in specific, identifiable localities. It reflects ordinary people's feelings of appropriateness, comfort, and correctness—attributes that define personal preferences and changing tastes. The socio-cultural of Javanese especially in Jatilawang Banyumas. Through the trilogy of “Ronggeng Dukuh Paruk”. Through its discursive strategies, the text presents that the cultural life of Javanese people at that time is mostly influenced by Hinduism. In economic side, Javanese people generally work in farming field. Meanwhile, the cultural condition indicates the pluralistic life of Javanese community. The present research’s effort is to examine the representation of Javanese local culture in an old text entitled “Ronggeng Dukuh Paruk”. Framed generally by CDA (Critical Discourse Analysis) theory and method, and particularly DHA (Discourse Historical Approach), the examination is focused on observing the five discursive strategies in micro- analysis under DHA, which includes strategies of nomination, predication, argumentation, perspectivation, and mitigation. The discussion also highlights the socio-cultural background of Javanese people in that period to see its influence on the content of the text itself. Thus, the integration of two disciplinaries of historical study and linguistics is well-achieved.Keyword: historical discourse analysis, local culture, first book triogy “Ronggeng Dukuh Paruk”.
Pengaruh Mathematical Beliefs terhadap Prestasi Belajar Matematika Siswa SMA
Authors: Isharyadi Ratri 
Published: February 2019

Penelitian ini bertujuan untuk mengetahui pengaruh mathematical beliefs terhadap prestasi belajar matematika siswa SMA. Mathematical beliefs merupakan keyakinan siswa terhadap matematika. Pada penelitian ini akan dilihat bagaimana keyakinan siswa terhadap matematika yang tergambar dari keyakinan siswa terhadap matematika sebagai mata pelajaran, keyakinan mengenai belajar matematika dan keyakinan terhadap masalah matematika. Penelitian ini adalah penelitian deskriptif korelasional menggunakan pendekatan kuantitatif. Sumber data penelitian ini adalah siswa pada salah satu kelas di SMAN 1 Rambah. Data yang dikumpulkan adalah data tentang mathematical beliefs melalui instrumen angket dan data hasil belajar matematika siswa. Data hasil penelitian dianalisis menggunakan analisis korelasi dan regresi untuk mengetahui besar pengaruh dan hubungan mathematical beliefs terhadap hasil belajar matematika siswa SMA. Seluruh proses analisis data dibantu dan memanfaatkan Microsoft office excel 2013 dan program komputer SPSS 20.0 for Windows. Hasil penelitian menunjukkan bahwa tidak terdapat pengaruh yang signifikan mathematical beliefs terhadap prestasi belajar matematika siswa.
PENGARUH MODEL PEMBELAJARAN EXPERIENTIAL LEARNINGTERHADAP KOMUNIKASI MATEMATIS SISWA
Authors: Sapta Andy 
Published: February 2019

Abstrak. Tujuan penelitian ini untuk mengetahui apakah peningkatan kemampuan komunikasi matematis siswa yang diajarkan dengan model pembelajaran experiential learning lebih tinggi daripada siswa yang diajarkan dengan model pembelajaran the power of two. Penelitian ini merupakan penelitian quasi eksperimen dengan populasi penelitian adalah seluruh siswa kelas X SMA Negeri 1 Buntu Pane. Dari data penelitian diperoleh thitung> ttabel (8,15 > 1,99). Hasil penelitian menunjukkan bahwa peningkatan kemampuan komunikasi matematik siswa yang diajarkan dengan model pembelajaran experiential learning lebih lebih tinggi daripada siswa yang diajarkan dengan model pembelajaran the power of two. Kata kunci:komunikasi matematis, experiential learning , the power of two
EFEKTIVITAS PENGGUNAAN MEDIA PEMBELAJARAN BERBASIS VIDEO TERHADAP PEMAHAMAN KONSEP MATEMATIS SISWA
Authors: Gusmania Yesi , Dari Tri Wulan 
Published: February 2019

Abstrak: Penelitian ini bertujuan untuk mengetahui: (1) terdapat perbedaan efektivitas dalam penggunaan media pembelajaran dengan berbasis video dan tidak menggunakan media pada pembelajaran konvensional terhadap pemahaman konsep matematis siswa. Jenis penelitian ini adalah penelitian eksperimen semu dengan desain penelitian Control Group Pretest- Posttest. Populasi penelitian ini adalah seluruh siswa SMPN 20 Batam kelas VIII tahun pelajaran 2016/2017. Pengambilan sampel dilakukan dengan teknik Cluster Random Sampling. Sampel penelitian kelas eksperimen VIII.4 dan sampel kelas kontrol VIII.2. Analisis data menggunakan rumus uji t dua sampel. Sebelum data dianalisis, data terlebih dahulu diuji prasyarat analisis yaitu uji normalitas dan homogenitas. Kemudian dilakukan uji hipotesis berdasarkan data tersebut. Hasil penelitian menunjukan bahwa: (1) terdapat efektivitas antara pembelajaran dengan media pembelajaran berbasis video dengan pembelajaran konvensional yang ditinjau dari pemahaman konsep matematis siswa. Kata Kunci : media video pembelajaran, metode konvensional, pemahaman konsep matematis Abstract:This research aims to know: (1) whether there are effectiveness and the difference between using video based learning media and not using media with conventional learning reviewed from student mathematical concepts understanding. The kinds of this research is Quasi Experiments research with Control Group Pretest Posttest research design. The population of this research are all student at SMPN 20 Batam in class VIII academic years 2016/2017. Taking sampling was done by Cluster Random Sampling technique. The research sample of experiment class is VIII.4 and sample of control class is VIII.2. The data was analyzed with using t test two sampling. Before the data was analyzed, the data was first tested on the pre requisite of analysis, there are normality test and homogeneity test. Then, conducted hypothesis test based on the data. The result of this research showed that: (1) there was the difference between video based learning media with conventional learning toward student mathematical concepts understanding. Key Words : VBL, conventional methods, mathematical concepts understanding.
DESKRIPSI DAN ANALISIS PENYEBARAN PENYAKIT MERS MELALUI MODEL REAKSI DIFUSI
Authors: Rozi Syamsyida 
Published: February 2019

Penelitian ini diadakan berkaitan dengan mewabahnya penyakit Mers di kawasan Timur Tengah sejak 2012, bahkan hingga ke Korea pada 2015. WHO menyatakan bahwa hingga saat ini belum ada vaksin untuk mencegah manusia dari virus Mers sehingga masih ada kasus Mers baru yang dilaporkan dari beberapa negara. Oleh karena itu, pada artikel ini, dibentuk model matematika berbentuk persamaan reaksi difusi dan kinetik berupa sistem persamaan diferensial parsial (PDP) berkenaan dengan penyebaran virus Mers yang melibatkan tindakan karantina terhadap individu yang terinfeksi Mers. Kemudian keberadaan solusi traveling wave dari model tersebut diinvestigasi dan kecepatan penyebaran virusnya dianalisa. Berdasarkan model dan nilai parameter yang digunakan, diperoleh besaran basic reproduction number, = 2,2 yang menunjukkan bahwa Mers menjadi epidemi di populasi, dan diperoleh kecepatan minimum penyebaran Mers sebesar 2,09 km/hari. Melalui analisa sensitifitas kecepatan dan gelombang traveling wave, diperoleh kesimpulan bahwa untuk mengontrol laju penyebaran virus Mers, maka sangat perlu mengkarantina individu yang terindikasi virus Mers segera. Keberadaan solusi traveling wave dari model dapat ditunjukkan melalui simulasi numerik dengan metode FTCS (Forward Time Center Space).
PENGEMBANGAN MODUL BERBASIS KONSTRUKTIVISME PADA MATA KULIAH ANALISIS VEKTOR DI UNRIKA
Authors: Husna Asmaul , Himmi Nailul 
Published: February 2019

Abstrak. Tujuan Umum penelitian untuk mengembangkan modul Analisis Vektor yang valid di Program Studi Pendidikan Matematika UNRIKA. Tujuan khusus penelitian adalah menyediakan produk berupa modul Analisis Vektor berbasis Konstruktivisme. Untuk mencapai tujuan tersebut, diperlukan suatu rancangan penelitian. Rancangan penelitian ini diuraikan dalam prosedur penelitian, prosedur penelitian yang digunakan model ADDIE yang terdiri dari 5 tahap, yaitu tahap analisis, tahap perancangan, tahap pengembangan, tahap implementasi dan tahap evaluasi. Instrumen yang digunakan berupa lembar penilaian modul dalam bentuk checklist yang diberikan kepada ahli materi dan ahli media untuk mengukur kevalidan. Data hasil validasi dari validator terhadap seluruh aspek yang dinilai, dianalisis secara kuantitatif dengan memberikan skor sesuai dengan skala yang ditetapkan yaitu pada rentang 1-4 dengan kategori sangat kurang-sangat baik. Hasil skor disajikan dalam bentuk tabel kemudian dicari persentase skor tersebut. Adapun hasil validitas modul dari ahli media diperoleh sebesar 78,92% dengan kategori baik dan validitas modul dari ahli materi sebesar 78,57% dengan kategori baik.Kata Kunci: Analisis Vektor, Konstruktifisme, Modul Abstract. General Purpose of the study to develop a valid Vector Analysis module in the UNRIKA Mathematics Education Study Program. The specific purpose of the research is to provide products in the form of Constructivism-based Vector Analysis modules. To achieve this goal, a research design is needed. The design of this study is described in the research procedure, the research procedure used by ADDIE model consists of 5 stages, namely the analysis stage, the design phase, the development stage, the implementation stage and the evaluation stage. The instrument used was a module assessment sheet in the form of a checklist given to material experts and media experts to measure validity. The validation data from the validator on all aspects that are assessed, are analyzed quantitatively by giving a score according to the specified scale in the range 1-4 with very less-very good category. The score results are presented in the form of tables and then look for the percentage of the score. The results of module validity from media experts were 78,92% with good categories and module validity from material experts was 78,57% with good categories..Keywords: Constructivism, Module, Vector Analysis
PENGARUH ASSET SPESIFIK DAN KEPEMILIKAN ASING TERHADAP CORPORATE SUSTAINABILITY DENGAN MEDIASI CORPORATE GOVERNANCE
Authors: TANGKE PAULUS , HABBE ABDUL HAMID 
Published: February 2019

This study aims to examine the effect of specific assets and foreign ownership on corporate sustainability with corporate governance as a mediation. This study is an empirical research using secondary data in the form of non-financial company data listed in the Indonesia Stock Exchange period 2011-2015. Based on the results of company sample selection conducted by purposive sampling method, it was selected 132 companies or 660 data years of the company. The theory used in this research is the stakeholders theory as the main theory with the theory of RBV as a supporting theory. The analytical method used in this study is path analysis using multiple regression test statistic tool - SPSS Version 24.
The results of this study indicate that specific assets have a positive and significant influence on corporate governance, but have a negative and insignificant effect on corporate sustainability. While foreign ownership has no effect on corporate governance but has negative and significant influence on corporate sustainability. Sobel test shows that Corporate governance in specific asset relation with corporate sustainability in this research is classified as type full mediation, but in foreign ownership relationship with corporate sustainability, corporate governance variable is classified as type no mediation
Diversity of Galaxy Dust Attenuation Curves Drives the Scatter in the IRX–β Relation
Authors: Salim Samir , Boquien Médéric 
Published: February 2019

Abstract
We study the drivers of the scatter in the IR excess (IRX)–β relation using 23,000 low-redshift galaxies from the GALEX–SDSS–WISE Legacy Catalog 2 (GSWLC-2). For each galaxy, we derive, using CIGALE and the spectral energy distribution+LIR fitting technique, the slope of the dust attenuation curve and the strength of the UV bump, plus many other galaxy parameters. We find that the IRX–β scatter is driven entirely by a wide range of attenuation curves—primarily by their slopes. Once the slope and the UV bump are fixed, the scatter in the IRX–β relation vanishes. The question of the IRX–β scatter is a direct manifestation of the more fundamental question of the diversity of dust attenuation curves. The predominant role of the attenuation curve is the consequence of a narrow range of intrinsic UV slopes of star-forming (SF) galaxies. Galaxies with different specific star formation rates (sSFRs) or population ages do not show strong trends in the IRX–β diagram because their attenuation curves are, on average, similar. Similarly, there is no shift in the IRX–β locus between starbursts and normal SF galaxies, both types having, on average, steep attenuation curves. Optical opacity is identified as the strongest determinant of the attenuation curve slope and consequently of the IRX–β diversity. Despite the scatter, the use of an average IRX–β relation is justified to correct SFRs, adding a random error of ≲0.15 dex. The form of the local correspondence between IRX–β and attenuation curves is maintained at high redshifts as long as the evolution of the intrinsic UV slopes stays within a few tenths.
On the Contribution of EMIC Waves to the Reconfiguration of the Relativistic Electron Butterfly Pitch Angle Distribution Shape on 2014 September 12—A Case Study*
Authors: Medeiros Claudia , Souza V. M. , Vieira L. E. A. , Sibeck D. G. , Halford A. J. , Kang S.-B. , Silva L. A. Da , Alves L. R. , Marchezi J. P. , Dallaqua R. S. , Jauer P. R. , Rockenbach M. , Mendes O. , Alves M. V. , Lago A. Dal , Fok M.-C. , Kanekal S. G. , Baker D. N. , Kletzing C. A. 
Published: February 2019

Abstract
Following the arrival of two interplanetary coronal mass ejections on 2014 September 12, the Relativistic Electron–Proton Telescope instrument on board the twin Van Allen Probes observed a long-term dropout in the outer belt electron fluxes. The interplanetary shocks compressed the magnetopause, thereby enabling the loss of relativistic electrons in the outer radiation belt to the magnetosheath region via the magnetopause shadowing. Previous studies have invoked enhanced radial transport associated with ultra-low-frequency waves activity and/or scattering into the atmosphere by whistler mode chorus waves to explain electron losses deep within the magnetosphere (L < 5.5). We show that energetic electron pitch angle distributions (PADs) provide strong evidence for precipitation also via interaction with electromagnetic ion cyclotron (EMIC) waves. High-resolution magnetic field observations on Van Allen Probe B confirm the sporadic presence of EMIC waves during the most intense dropout phase on September 12. Observational results suggest that magnetopause shadowing and EMIC waves together were responsible for reconfiguring the relativistic electron PADs into peculiar butterfly PAD shapes a few hours after an interplanetary shock arrived at Earth.
X-Ray Surface Brightness Profiles of Optically Selected Active Galactic Nuclei: Comparison with X-Ray AGNs
Authors: Mukherjee Sagnick , Bhattacharjee Anirban , Chatterjee Suchetana , Newman Jeffrey A. , Yan Renbin 
Published: February 2019

Abstract
We use data from the All Wavelength Extended Groth Strip International Survey to construct stacked X-ray maps of optically bright active galactic nuclei (AGNs) and an associated control sample of galaxies at high redshift (z ∼ 0.6). From our analysis of the surface brightness profiles obtained from these X-ray maps, we find evidence of feedback from the active nuclei. We find that excluding galaxies and AGNs, residing in group environments, from our samples enhances the significance of our detection. Our results support the tentative findings of Chatterjee et al., who use X-ray-selected AGNs for their analysis. We discuss the implications of these results in the context of quantifying AGN feedback and show that the current method can be used to extract an X-ray source population in high-redshift galaxies.
LAXPC/AstroSat Study of ∼1 and ∼2 mHz Quasi-periodic Oscillations in the Be/X-Ray Binary 4U 0115+63 during Its 2015 Outburst
Authors: Roy Jayashree , Agrawal P. C. , Iyer N. K. , Bhattacharya D. , Yadav J. S. , Antia H. M. , Chauhan J. V. , Choudhury M. , Dedhia D. K. , Katoch T. , Madhavani P. , Manchanda R. K. , Misra R. , Pahari M. , Paul B. , Shah P. 
Published: February 2019

Abstract
The Be/X-ray binary 4U 0115+63 was observed by the Large Area X-ray Proportional Counter (LAXPC) instrument on AstroSat on 2015 October 24 during the peak of a giant Type II outburst. Prominent intensity oscillations at ∼1 and ∼2 mHz frequency were detected during the outburst. Nuclear Spectroscopic Telescope Array (NuSTAR) observations made during the same outburst also show millihertz quasi-periodic oscillations (QPOs). Details of the oscillations and their characteristics deduced from LAXPC/AstroSat and NuSTAR observations are reported in this paper. Analysis of the archival Rossi X-ray Timing Explorer/Proportional Counter Array data during 2001–2011 also show the presence of millihertz QPOs during some of the outbursts, and details of these QPOs are also reported. Possible models to explain the origin of the millihertz oscillations are examined. Similar QPOs, albeit at higher frequencies, have been reported from other neutron star and black hole sources, and both may have a common origin. Current models to explain the instability in the inner accretion disk causing the intense oscillations are discussed.
The Long-term Evolution and Appearance of Type Iax Postgenitor Stars
Authors: Zhang Michael , Fuller Jim , Schwab Josiah , Foley Ryan J. 
Published: February 2019

Abstract
Type Iax supernovae may arise from failed explosions of white dwarfs (WDs) that leave behind a bound remnant (i.e., a “postgenitor” star) that could be identified in wide field surveys. To understand their observational signatures, we simulate these WD postgenitors from shortly after explosion until they move back down the WD cooling track, and we consider several possible WD masses and explosion energies. To predict the peculiar surface abundances of the WD postgenitors, our models take into account gravitational settling and radiative levitation. We find that radiative levitation is significant at temperatures above a mass-dependent critical temperature, typically in the range T
eff ≈ (50–100) × 103 K, significantly increasing surface abundances of iron group elements. Due to enhanced iron group opacity compared to normal WDs, the postgenitor peak luminosity and cooling timescale depend sensitively on mass, with more massive WDs becoming brighter but cooling much faster. We discuss our results in light of recently discovered hypervelocity WDs with peculiar surface compositions, finding that our low-mass postgenitor models match many of their observational characteristics. Finally, we explore the effects of thermohaline diffusion, tentatively finding that it strongly suppresses abundance enhancements created by radiative levitation, but more realistic modeling is required to reach a firm conclusion.
Fermi Observation of the Jets of the Microquasar SS 433
Authors: Xing Yi , Wang Zhongxiang , Zhang Xiao , Chen Yang , Jithesh V. 
Published: February 2019

Abstract
We report our analysis of the data obtained with the Large Area Telescope onboard the Fermi Gamma-ray Space Telescope (Fermi) for the SS 433/W50 region. The total data length is ten years. Different from the previous results reported for this region (for which an old version of database was used), we show that excess emission is detected around the w1 region in the western lobe of the jets from SS 433. The region is bright at X-rays due to the interaction between the jet and the ambient medium. This detection also matches well the recent results of the very-high-energy detection of SS 433/W50 with the High Altitude Water Cherenkov (HAWC). However, the eastern regions that are slightly brighter in HAWC’s observation are not detected in the Fermi data. Constructing the broadband spectral energy distribution for the western region, we compare with the HAWC results for the eastern regions and discuss the possible origin of the emission. A leptonic scenario can provide a fit to the Fermi GeV spectrum and HAWC TeV detection, where the former and latter are due to the synchrotron radiation and inverse-Compton process respectively. However, the model cannot explain the X-ray and radio emission from the region simultaneously, which thus requires further observational and theoretical studies of the region in order to clarify the reasons.