bluuebunny/crossref_metadata_2025_split huggingface dataset:
MENINGKATKAN HASIL BELAJAR MATEMATIKA SISWA DENGAN MENGGUNAKAN MODEL PEMBELAJARAN KOOPERATIF TIPE THINK-PAIR-SHARE (TPS) PADA SISWA KELAS VB SD MUHAMMADIYAH I SORONG
Authors: Trisnawati Nika Fetria 
Published: January 2019

Abstract This research aims to describe the Cooperative Learning Model Type Think-Pair-Share (TPS) that can improve students' mathematics learning outcomes. The research was conducted in sorong. The subject of this research was fifth grade class B at SD Muhammadiyah I Sorong in academic year 2010/2011. The students consist of 14 males and 24 females. The research was Classroom Action Research (PTK). The procedure and Implementation at the study site was divided into two cycles. In the first cycle performed four times of implementation by using Cooperative Learning Model Type Think-Pair-Share (TPS). The second cycle took four times with the same model. The observations took with the observation sheet has been prepared, and then reflected by writer and teacher to evaluate the research that has been run on each cycle and to improve the implementation of the next cycle. The technique of data collection was done by using observation and tests. The data were performed with qualitative and quantitative analysis. The results of this study indicate that students' mathematics learning outcomes at SD Muhammadiyah I fifth grade class B increases. At the beginning of test the average was 5,40 and at the end of the first cycle mean score was 5.84. Being at the end of second cycle the average was of 8,09. The action did to stimulate the students' attention by giving preliminary description of matter at the beginning of the meeting, the student group discussions and presentations, providing competition, growing students’ curiosity by implementing the Cooperative Learning Model Type Think-Pair-Share (TPS). Giving the relevance of study based on students' experience and providing them the example that is relevant to students. To increase the students self confidence was done by giving them the opportunity to answer questions and write them down in front, giving verbal praise who are successful, providing the opportunity to the group to present the result of discussion, and provide feedback. To increase student satisfaction with verbal praise who are successful, notify the student test results obtained, and giving appropriate rewards and not excessive.
Profil Kemampuan Siswa SMP dalam Memecahkan Masalah Matematika Open-Ended Berdasarkan Kemampuan Prasyarat Tinggi
Authors: Anwar Zakiyah , Arsyad Rahmatullah Bin 
Published: January 2019

Penelitian ini merupakan penelitian deskriptif kualitatif yang pelaksannannya di SMP YPK Syaloom kota Sorong. Penelitian ini bertujuan mendeskripsikan profil kemampuan siswa dalam memecahkan masalah matematika open-ended berdasarkan kemampuan Prasyarat tinggi. Instrumen yang digunakan dalam penelitian ini adalah (1) tes GEFT, (2) tes kemampuan prasyarat SPLDV, (3) tes pemecahan masalah open-ended, (4) dan tes wawancara, baik yang terstruktur maupun yang tidak terstruktur. Subjek penelitian dibedakan berdasarkan tingkat kemampuan prasyarat prasyarat tinggi dan gaya kognitif gaya Field Dependen dan Field Independen. Hasil penelitian ini adalah (1) subjek penelitian dengan kemampuan prasyarat tinggi gaya kognitif field dependen, menunjukkan kemampuan yang baik dalam memahami masalah dengan tepat, merencanakan pemecahan, menyelesaikan masalah sesuai dengan rencana dan memeriksa kembali hasil yang diperoleh. Subjek dapat menyelesaikan masalah SPLDV dengan metode eliminasi, gabungan, dan metode grafik, (2) subjek penelitian dengan kemampuan prasyarat tinggi gaya kognitif field independen, dapat memahami masalah dengan tepat, melaksanakan pemecahan sesuai rencana, dan memeriksa kembali hasil yang diperoleh. Subjek dapat menyelesaikan masalah SPLDV dengan metode eliminasi, subtitusi, gabungan. Penelitian ini sangat membantu pendidik dalam memberikan soal masalah matematika berdasarkan kemampuan yang dimiliki oleh siswa.
Pengaruh Penambahan Probiotik Dengan Dosis Berbeda Pada Pakan Terhadap Pertumbuhan Dan Rasio Konversi Pakan (Fcr) Ikan Nila (Oreochromis Niloticus)
Authors: Fahrizal Ahmad , Nasir M 
Published: January 2019

Penelitian ini bertujuan Â untuk mengetahui pengaruh penambahan atau aplikasi probiotik menggunakan dosis berbeda pada pakan terhadap pertumbuhan ikan nila.Metode yang digunakan pada penelitian ini yaitu metode eksperimen/percobaan dengan analisa data yang digunakan menggunakan Rancangan Acak Lengkap (RAL). Wadah yang digunakan adalah ember dengan volume 100 liter, 13 buah. Penelitian ini terdiri dari 1 kontrol dan 3 perlakuan dengan ulangan setiap perlakuan sebanyak 4 kali. Ikan uji pada setiap wadah diisi sebanyak 10 ekor. Penggunaan dosis probiotik pada perlakuan I yaitu dosis 5ml, perlakuan II :10 ml, serta perlakuan III yaitu 15 ml.Hasil penelitian menunjukkan bahwa nilai konversi pakan atau Food Convertion Ratio (FCR) yang diperoleh pada perlakuan I, II, dan III secara berturut-turut adalah 1.82, 1.75, dan 1.73. Nilai konversi pakan/FCR terbaik yaitu perlakuan III dengan dosis 15ml diperoleh nilai FCR 1.73. Hal ini bermakna setiap pemberian pakan sebanyak 1,73 kg, akan menghasilkan 1 kg ikan nila. Sedangkan nilai Survival Rate (SR)yang diperoleh ayitu sebesar 100% atau ikan nila yang dipelihara pada penelitian ini, tidak mengalami kematian.Kesimpulan dari penelitian ini adalah dengan penambahan probiotik menggunakan dosis berbeda pada pakan ikan nila, tidak berpengaruh signifikan terhadap pertumbuhan bobot dan panjang ikan nila dengan menggunakan analisis sidik ragam (anova). Pemberian probiotik lebih memberikan pengaruh terhadap FCR ikan nila.Â
MANFAAT NILAI EKONOMI HASIL HUTAN OLEH MASYARAKAT DI KAMPUNG FEF DISTRIK FEF KABUPATEN TAMBRAUW
Authors: Maruapey Azis , Bame Engelberta Martina 
Published: January 2019

Penelitian ini bertujuan untuk mengetahui jenis-jenis hasil hutan yang dimanfaatkan oleh masyarakat dan nilai manfaat ekonomi hutan oleh masyarakat kampung Fef Distrik Fef Kabupaten Tambrauw. Jenis-jenis hasil hutan yang dimanfaatkan oleh masyarakat kampung Fef distrik Fef kabupaten Tambrauw berupa hasil hutan kayu dan non kayu yang dimanfaatkan oleh masyarakat dalam berbagai kategori yaitu getah kayu, hasil hutan berupa minyak hasil sulingan, kulit kayu, buah biji dan daun, pohon tumbuhan khusus, binatang dan bagian binatang. Nilai manfaat ekonomi hasil hutan kayu maupun non kayu oleh masyarakat kampung Fef Distrik Fef Kabupaten Tambrauw dapat menunjang perekonomian mereka yaitu pendapatan masyarakat responden total adalah sebesar Rp. 35.000.000/bln. Dimana untuk hasil hutan kayu sebesar Rp. 26.000.000/blnÂ (74,28%), sedangkan hasil hutan non kayu Rp 9.000.000/bln (25,72%).
EFEKTIVITAS MODEL PEMBELAJARAN KOOPERATIF TIPE TWO STAY TWO STRAY DENGAN PENDEKATAN SAINTIFIK DALAM PEMBELAJARAN MATEMATIKA PADA SISWA SMP NEGERI 2 KOTA SORONG
Authors: Trisnawati Nika Fetria 
Published: January 2019

Penelitian ini merupakan penelitian pre-eksperimental design dengan one-group pretest-postestdesign yang bertujuan untuk mengetahui keefektifan pembelajaran statistika melalui Model Pembelajaran Kooperatif Tipe Two Stay Two Stray (TSTS) dengan Pendekatan Saintifik pada kelas VII F SMP Negeri 2 Kota Sorong. Penelitian ini dilaksanakan pada tanggal 2 Mei sampai dengan 2 Juni 2016 di SMP Negeri 2 Kota Sorong.Populasi penelitian ini adalah siswa kelas VII semester genap tahun pelajaran 2015/2016, yang terdiri dari 10 kelas. Teknik pengambilan sampel adalah cluster random sampling. Data tentang aktivitas siswa diperoleh dengan menggunakan lembar observasi, data tentang respon siswa terhadap pembelajaran doperoleh dengan menggunakan lembar angket, data peningkatan self efficacy siswa diperoleh dengan menggunakan lembar angket dan untuk mengetahui hasil belajar materi statistika digunakan tes hasil belajar. Analisis data yang digunakan adalah analisis deskriptif untuk mendeskripsikan keterlaksanaan pembalajaran, aktivitas siswa, respon siswa, self efficacy siswa serta hasil belajar siswa dan analisis inferensial untuk menguji hipotesis penelitianHasil penelitian menunjukkan bahwa: (1) keterlaksanaan pembelajaran menggunakan model pembelajaran kooperatif tipe Two Stay Two Stray dengan Pendekatan Saintifik selama 5 kali pertemuan dalam kategori sangat baik, (2) aktivitas siswa dalam kategori sangat efektif, (3) respon siswa terhadap pembelajaran cenderung positif, (4) self efficacy siswa setelah pembelajaran menunjukkan peningkatan dari sebanyak 94% siswa pada kategori cenderung negatif menjadi 94% siswa pada kategori cenderung positif, (5) hasil belajar siswa mencapai ketuntasan belajar 87,88%, nilai rata-rata 78,58. Dengan demikian dari hasil penelitian dapat disimpulkan bahwa Model Pembelajaran KoopefatifÂ Tipe Two Stay Two Stray dengan Pendekatan Saintifik dalam Pembelajaran Matematika pada Siswa SMPÂ Negeri 2 Kota Sorong pada materi statistika dapat meningkatkan hasil belajar siswa.
Pemodelan Respon Struktur Pemecah Gelombang Tipe Terapung dengan Peredam Tambahan (Heave Plate)
Authors: Samaila Muh Akhsan , Butudoka Marina Abriani 
Published: January 2019

Salah satu cara untuk meningkatkan efektifitas sebuah pemecah gelombang terapung adalah dengan memperbesar hydrodynamic damping atau viscous damping. Redaman hidrodinamik bergantung pada bentuk dan frekuensi gerakan dari struktur. Penelitian ini bertujuan meninjau pengaruh penambahan redaman pada struktur terapung dengan variasi sudut yaitu 90o, 150o dan 180o yang membatasi respon gerak struktur terapung hanya arah vertikal (heave motion) dimana sistem pengikat berupa pile untuk menjaga struktur terapung hanya bergerak secara vertikal. Model uji struktur terapung memiliki dimensi panjang 1.1 m, lebar 0.6 m dan tinggi 0.4 m. Gelombang yang digunakan pada model adalah gelombang regular dimana gelombang dicatat menggunakan alat wave gauge sedangkan pencatatan respon gerak struktur menggunakan alat accelerometer. Gerak translasi arah vertical (heave motion) diperoleh dari hasil integrasi numerik data kecepatan hasil pencatatan accelerometer. Berdasarkan hasil pengujian diperoleh nilai rasio redaman yang paling besar (ζ) yaitu redaman tambahan dengan variasi sudut 90o sebesar 0.418 sedangkan redaman tambahan dengan sudut 180o dan 150o masing-masing sebesar 0.344 dan 0.326. Untuk respon gerak struktur terapung (gerak translasi), sistem redaman tambahan yang memiliki sudut 90o paling besar mengurangi simpangan gerak translasi sebesar 0.1 m.
A Pluto–Charon Sonata: The Dynamical Architecture of the Circumbinary Satellite System
Authors: Kenyon Scott J. , Bromley Benjamin C. 
Published: January 2019

Abstract
Using a large suite of n-body simulations, we explore the discovery space for new satellites in the Pluto–Charon system. For the adopted masses and orbits of the known satellites, there are few stable prograde or polar orbits with semimajor axes

, where a

H
is the semimajor axis of the outermost moon Hydra. Small moons with radii

≲ 2 km and a ≲ 1.1 a

H
are ejected on timescales ranging from several years to more than 100 Myr. Orbits with a ≳ 1.1 a

H
are stable on timescales exceeding 150–300 Myr. Near-infrared (IR) and mid-IR imaging with several instruments on James Webb Space Telescope and ground-based occultation campaigns with 2–3 m class telescopes can detect 1–2 km satellites outside the orbit of Hydra. Searches for these moons enable new constraints on the masses of the known satellites and on theories for circumbinary satellite formation.
A Catalog of Wide Binary and Multiple Systems of Bright Stars from Gaia-DR2 and the Virtual Observatory
Authors: Jiménez-Esteban F. M. , Solano E. , Rodrigo C. 
Published: January 2019

Abstract
Binary and multiple stars have long provided an effective empirical method of testing stellar formation and evolution theories. In particular, the existence of wide binary systems (separations >20,000 au) is particularly challenging to binary formation models as their physical separations are beyond the typical size of a collapsing cloud core (∼5000–10,000 au). We mined the recently published Gaia-DR2 catalog to identify bright comoving systems in the five-dimensional space (sky position, parallax, and proper motion). We identified 3741 comoving binary and multiple stellar candidate systems, out of which 575 have compatible radial velocities for all the members of the system. The candidate systems have separations between ∼400 and 500,000 au. We used the analysis tools of the Virtual Observatory to characterize the comoving system members and to assess their reliability. The comparison with previous comoving systems catalogs obtained from TGAS showed that these catalogs contain a large number of false systems. In addition, we were not able to confirm the ultra-wide binary population presented in these catalogs. The robustness of our methodology is demonstrated by the identification of well known comoving star clusters and by the low contamination rate for comoving binary systems with projected physical separations <50,000 au. These last constitute a reliable sample for further studies. The catalog is available online at the Spanish Virtual Observatory portal (http://svo2.cab.inta-csic.es/vocats/v2/comovingGaiaDR2/).
Killing Planet Candidates with EVEREST
Authors: Greklek-McKeon Michael , Deming Drake 
Published: January 2019

Abstract
We exploit high-quality photometry from the EVEREST pipeline to evaluate false-positive exoplanet candidates from the K2 mission. We compare the practical capabilities of EVEREST’s pixel-level decorrelation scheme to the data analysis pipelines widely used at the time of these planet candidates’ discovery. Removing stellar variability from the EVEREST-corrected light curves, we search for potential secondary eclipses. For each object exhibiting a secondary eclipse, we compare the implied brightness temperature of the planet candidate to its calculated equilibrium temperature. We thereby identify objects whose brightness temperature is too high to be consistent with a planet. We identify seven systems previously flagged as planetary candidates in preliminary vetting pipelines, and use EVEREST to instead identify six of them as eclipsing binaries. We also project the importance of optimal photometric vetting for TESS data. We find that the majority of blended eclipsing binaries could be identified using TESS photometry, and a systematic study of that kind could in principle also yield valuable information on the mass ratio distribution in stellar eclipsing binaries.
The Enigmatic (Almost) Dark Galaxy Coma P: Distance Measurement and Stellar Populations from HST Imaging*
Authors: Brunker Samantha W. , McQuinn Kristen B. W. , Salzer John J. , Cannon John M. , Janowiecki Steven , Leisman Lukas , Rhode Katherine L. , Adams Elizabeth A. K. , Ball Catherine , Dolphin Andrew E. , Giovanelli Riccardo , Haynes Martha P. 
Published: January 2019

Abstract
We present Hubble Space Telescope (HST) observations of the low surface brightness (SB) galaxy Coma P. This system was first discovered in the Arecibo Legacy Fast ALFA H i survey and was cataloged as an (almost) dark galaxy because it did not exhibit any obvious optical counterpart in the available survey data (e.g., Sloan Digital Sky Survey). Subsequent WIYN pODI imaging revealed an ultra-low SB stellar component located at the center of the H i detection. We use the HST images to produce a deep color–magnitude diagram of the resolved stellar population present in Coma P. We clearly detect a red stellar sequence that we interpret to be a red giant branch and use it to infer a tip of the red giant branch distance of

Mpc. The new distance is substantially lower than earlier estimates and shows that Coma P is an extreme dwarf galaxy. Our derived stellar mass is only 4.3 × 105
M
⊙, meaning that Coma P has an extreme H i-to-stellar mass ratio of 81. We present a detailed analysis of the galaxy environment within which Coma P resides. We hypothesize that Coma P formed within a local void and has spent most of its lifetime in a low-density environment. Over time, the gravitational attraction of the galaxies located in the void wall has moved it to the edge, where it had a recent “fly-by” interaction with M64. We investigate the possibility that Coma P is at a farther distance and conclude that the available data are best fit by a distance of 5.5 Mpc.
Chemical Abundance Signature of J0023+0307: A Second-generation Main-sequence Star with [Fe/H] < −6*
Authors: Frebel Anna , Ji Alexander P. , Ezzeddine Rana , Hansen Terese T. , Chiti Anirudh , Thompson Ian B. , Merle Thibault 
Published: January 2019

Abstract
We present a chemical abundance analysis of the faint halo metal-poor main-sequence star J0023+0307, with [Fe/H] < −6.3, based on a high-resolution (R ∼ 35,000) Magellan/MIKE spectrum. The star was originally found to have [Fe/H] < −6.6 based on a Ca ii K measurement in an R ∼ 2500 spectrum. No iron lines could be detected in our MIKE spectrum. Spectral lines of Li, C, Na, Mg, Al, Si, and Ca were detected. The Li abundance is close to the Spite Plateau,

(Li) = 1.7, not unlike that of other metal-poor stars, although in stark contrast to the extremely low value found, e.g., in HE 1327–2326 at a similar [Fe/H] value. The carbon G-band is detected and indicates strong C-enhancement, as is typical for stars with low Fe abundances. Elements from Na through Si show a strong odd–even effect, and J0023+0307 displays the second-lowest known [Ca/H] abundance. Overall, the abundance pattern of J0023+0307 suggests that it is a second-generation star that formed from gas enriched by a massive Population III first star exploding as a fallback supernova. The inferred dilution mass of the ejecta is 105±0.5
M
⊙ of hydrogen, strongly suggesting J0023+0307 formed in a recollapsed minihalo. J0023+0307 is likely very old because it has a very eccentric orbit with a pericenter in the Galactic bulge.
A Galactic Plane Defined by the Milky Way H ii Region Distribution
Authors: Anderson L. D. , Wenger Trey V. , Armentrout W. P. , Balser Dana S. , Bania T. M. 
Published: January 2019

Abstract
We develop a framework for a new definition of the Galactic midplane, allowing for tilt (

; rotation about Galactic azimuth 90°) and roll (

; rotation about Galactic azimuth 0°) of the midplane with respect to the current definition. Derivation of the tilt and roll angles also determines the solar height above the midplane. Here we use nebulae from the Wide-field Infrared Survey Explorer (WISE) Catalog of Galactic H ii Regions to define the Galactic high-mass star formation (HMSF) midplane. We analyze various subsamples of the WISE catalog and find that all have Galactic latitude scale heights near 0.°30 and z-distribution scale heights near 30

. The vertical distribution for small (presumably young) H ii regions is narrower than that of larger (presumably old) H ii regions (∼25

versus ∼40

), implying that the larger regions have migrated further from their birth sites. For all H ii region subsamples and for a variety of fitting methodologies, we find that the HMSF midplane is not significantly tilted or rolled with respect to the currently defined midplane, and, therefore, the Sun is near to the HMSF midplane. These results are consistent with other studies of HMSF, but are inconsistent with many stellar studies, perhaps because of asymmetries in the stellar distribution near the Sun. Our results are sensitive to latitude restrictions and also to the completeness of the sample, indicating that similar analyses cannot be done accurately with less complete samples. The midplane framework we develop can be used for any future sample of Galactic objects to redefine the midplane.
Cosmological Hydrodynamic Simulations with Suppressed Variance in the Lyα Forest Power Spectrum
Authors: Anderson Lauren , Pontzen Andrew , Font-Ribera Andreu , Villaescusa-Navarro Francisco , Rogers Keir K. , Genel Shy 
Published: January 2019

Abstract
We test a method to reduce unwanted sample variance when predicting Lyα forest power spectra from cosmological hydrodynamical simulations. Sample variance arises due to sparse sampling of modes on large scales and propagates to small scales through nonlinear gravitational evolution. To tackle this, we generate initial conditions in which the density perturbation amplitudes are fixed to the ensemble average power spectrum—and are generated in pairs with exactly opposite phases. We run 50 such simulations (25 pairs) and compare their performance against 50 standard simulations by measuring the Lyα 1D and 3D power spectra at redshifts z = 2, 3, and 4. Both ensembles use periodic boxes of

40

h

−
1

Mpc

containing 5123 particles each of dark matter and gas. As a typical example of improvement, for wavenumbers

k
=
0.25

h

Mpc

−
1

at z = 3, we find estimates of the 1D and 3D power spectra converge 34 and 12 times faster in a paired–fixed ensemble compared with a standard ensemble. We conclude that, by reducing the computational time required to achieve fixed accuracy on predicted power spectra, the method frees up resources for exploration of varying thermal and cosmological parameters—ultimately allowing the improved precision and accuracy of statistical inference.
CO Multi-line Observations of HH 80–81: A Two-component Molecular Outflow Associated with the Largest Protostellar Jet in Our Galaxy
Authors: Qiu Keping , Wyrowski Friedrich , Menten Karl , Zhang Qizhou , Güsten Rolf 
Published: January 2019

Abstract
Reaching a length of 10 pc projected in the plane of the sky, the radio jet associated with Herbig–Haro (HH) objects 80 and 81 (HH 80–81) is known to be the largest and best collimated protostellar jet in our Galaxy. The nature of the molecular outflow associated with this extraordinary jet remains an unsolved question, and is of great interest for our understanding of the relationship between jets and outflows in high-mass star formation. Here we present Atacama Pathfinder EXperiment CO (6–5) and (7–6), James Clerk Maxwell Telescope CO (3–2), Caltech Submillimeter Observatory CO (2–1), and Submillimeter Array CO and 13CO (2–1) mapping observations of the outflow. We report on the detection of a two-component outflow consisting of a collimated component along the jet path and a wide-angle component with an opening angle of about 30°. The gas velocity structure suggests that each of the two components traces part of a primary wind. From large velocity gradient calculations of the CO lines, the outflowing gas has a temperature around 88 K, indicating that it is being heated by shocks. Based on the CO (6–5) data, the outflow mass is estimated to be a few M
⊙, dominated by the wide-angle component. A comparison between the HH 80–81 outflow and other well shaped massive outflows suggests that the opening angle of massive outflows continues to increase over time. Therefore, the mass-loss process in the formation of early-B stars seems to be similar to that in low-mass star formation, except that a jet component would disappear as the central source evolved to an ultracompact H ii region.
The Two-dimensional Internal Rotation of KIC 11145123
Authors: Hatta Yoshiki , Sekii Takashi , Takata Masao , Kurtz Donald W. 
Published: January 2019

Abstract
The 2D internal rotation of KIC 11145123 has been inferred via asteroseismology. Based on the optimally localized averaging method and a simple three-zone modeling of the internal rotation, we have found evidence for a contrast between the internal rotation of the radiative region and that of the convective core; the radiative region rotates almost uniformly throughout the region, but the convective core may be rotating about 6 times faster than the radiative region above. We have also found marginally significant evidence of latitudinal differential rotation in the outer envelope. These newly indicated features of the internal rotation of the star can help us further constrain the theory of angular momentum transport inside stars, as well as understand the complex physical properties of the star, which was once thought to be a main-sequence A-type star but recently has been proposed to be a blue straggler, based on spectroscopy.