bluuebunny/crossref_metadata_2025_split huggingface dataset:
Entre el modernismo y el vanguardismo: las incursiones incaicas en Los heraldos negros de Vallejo
Authors: Ward Thomas 
Published: August 2019

Entre los movimientos modernista y vanguardista, Los heraldos negros de César Vallejo ostenta una fuerte dosis de indigenismo, pero también brinda elementos que evocan al antiguo Tahuantinsuyo, los cuales constituyen lo que puede llamarse incaísmo. Este artículo pretende aislar algunos de los referentes indígenas de Los heraldos negros para determinar si son indigenistas (representación sociorrealista) o incaístas (recuperación de los incas). Se concluirá definiendo el concepto indígena en Los heraldos negros.
PEMBELAJARAN PEMECAHAN MASALAH MATEMATIS SISWA SEKOLAH DASAR DENGAN MODEL CREATIVE PROBLEM SOLVING (CPS)
Authors: Widodo Suprih , Kartikasari Kartikasari 
Published: August 2019

Kemampuan pemecahan masalah merupakan salah satu tujuan pembelajaran matematika, tetapi kemampuan pemecahan masalah matematis siswa tergolong rendah, berdasarkan hasil penelitian sebelumnya dan wawancara dengan guru sekolah dasar bahwa siswa belum terbiasa menyelesaikan soal pemecahan masalah (soal non rutin) sehingga siswa sulit memahami soal. Fakta tersebut merupakan latar belakang dari penelitian dengan tujuan untuk mengetahui apakah ada perbedaan kemampuan pemecahan masalah matematis siswa antara kelas yang menggunakan model pembelajaran Creative Problem Solving dengan kelas yang menggunakan metode konvensional. Metode penelitian yang digunakan adalah kuasi eksperimen dengan nonequivalent pretest-posttest control group design. Populasi dari penelitian yaitu kelas IV di salah satu SD Kecamatan Munjuljaya dengan sampel siswa kelas IVB dan kelas IVC. Teknik sampel yang digunakan yaitu purposive sampling. Instrumen yang digunakan adalah tes kemampuan pemecahan masalah yang diberikan sebelum dan sesudah perlakuan. Data dianalisis menggunakan statistik deskriptif dan statistik inferensial. Berdasarkan hasil penelitian dari skor N-gain, rata-rata N-gain kelas eksperimen tergolong sedang dan rata-rata kelas kontrol tergolong rendah dan dari hasil uji t dengan taraf kepercayaan 95% menunjukkan tidak adanya perbedaan kemampuan pemecahan masalah matematis siswa antara kelas yang menggunakan model pembelajaran Creative Problem Solving dengan kelas yang menggunakan metode konvensional. Dibutuhkan pemahaman konsep matematika untuk dapat menyelesaikan kemampuan pemecahan masalah. Kata kunci : Model Pembelajaran Creative Problem Solving (CPS), Kemampuan Pemecahan Masalah Matematis
PENERAPAN GEOGEBRA UNTUK MENINGKATKAN KEMAMPUAN PEMECAHAN MASALAH MATEMATIS MAHASISWA PROGRAM STUDI PENDIDIKAN MATEMATIKA UNIVERSITAS SURYAKANCANA
Authors: Septian Ari 
Published: August 2019

Kalkulus II merupakan materi yang harus dipahami oleh mahasiswa sebagai dasar untuk mengajar di sekolah. Integral yang menjadi pokok pembahasan pada mata kuliah kalkulus II menjadi fokus utama. Mahasiswa masih mengalami kesulitan dalam menentukan luas daerah dan volume benda putar pada materi integral dengan menggunakan fungsi-fungsi yang bervariasi. Oleh karena itu perlu suatu cara baru berbasis teknologi agar mahasiswa lebih tertarik dan tentunya paham materi kalkulus II dengan menggunakan software GeoGebra. Jenis penelitian menggunakan eksperimen kuasi. Subjek penelitian ini adalah mahasiswa tingkat 2 semester 4 tahun akademik 2015-2016 sebanyak dua kelas, kelas B sebagai kelas eksperimen dan kelas A sebagai kelas kontrol. Desain penelitian ini menggunakan desain nonequivalent control group design. Pengumpulan data dilakukan dengan menggunakan instrumen tes berupa soal uraian dan non tes berupa angket skala sikap. Hasilnya, peningkatan kemampuan pemecahan masalah matematis mahasiswa yang menerapkan GeoGebra lebih baik daripada mahasiswa yang menggunakan pembelajaran ekspositori dan sikap mahasiswa terhadap penerapan GeoGebra positif. Kata Kunci : GeoGebra, Pemecahan Masalah, Kalkulus II
ORAL PRESENTATION STRATEGY FOR ENHANCING ENGLISH SPEAKING PROFICIENCY TO NON-ENGLISH MAJOR STUDENTS
Authors: Nguyen Thao Hieu 
Published: August 2019

This paper presents an integratedskill approach of using oral presentations as an interactive teaching tool in non-English major classrooms, specifically in the context of Tra Vinh University. This paper has the following sections: (1) introducing the context of teaching and learning English and the factors affecting students’ speaking ability in Vietnam and in several other countries; (2) presenting the benefits of integrating oral presentation in the classroom; (3) proposing suggestions that help EFL teachers to apply this approach effectively. The result shows that four main factors, which affect students’ speaking ability, are a lack of topical knowledge, low self-esteem, limited chances of practice and the overuse of mother tongue. By giving presentation, students have a higher level of confidence, speak correctly, use more vocabularies, and develop other language skills as well as soft-skills. However, teachers need to instruct students clearly; reduce pressure on student grades and make effective feedback to individual. Besides, students need encouragement to create dynamic learning environment. It is hoped that the pedagogical ideas presented in this paper can help teachers effectively employ oral presentations as a means of improving students’ English speaking ability.
Çocuk psikiyatrisi polikliniğine çeşitli nedenlerle başvurmuş, akıllı telefon bağımlılığı olan ergenlerin aldığı psikiyatrik tanılar
Authors: AKALTUN İsmail , AYAYDIN Hamza 
Published: August 2019

Amaç: Akıllı telefon bağımlılığı, çoğunlukla telefondan uzak
kalamama, sık sık telefonu kontrol etme, aşırı akıllı telefon kullanımı
nedeniyle uykusuzluk ve uyku kalitesinin bozulması gibi belirtilerle ortaya
çıkmaktadır. Bu yüzden bu çalışmamızda polikliniğimize çeşitli nedenlerle
başvurmuş, akıllı telefon bağımlılığı olan ergenlerin aldığı psikiyatrik
hastalıkları değerlendirdik.Materyal ve
Metot: Çocuk psikiyatrisi polikliniğine
çeşitli nedenlerle başvurmuş olan ergenlere cep telefonu bağımlılığı ölçeği
kısa formu doldurtuldu. Cep telefonu bağımlılık ölçeği kesme puanlarını aşan 80
katılımcının, DSM-5 tanı kriterlerine göre aldığı psikiyatrik tanılar
değerlendirildi.Bulgular: Çalışmamıza katılan hastaların 47’si erkek, 33’ü kız idi.
Erkeklerin yaş ortalaması 14,03±1,5, kızların yaş ortalaması 13,9 ± 1,5 idi.
Kızların akıllı telefonla geçirdiği süre günlük ortalama 5,09±1,15 saat, cep
telefonu bağımlılığı ölçeği puanı 40,06±4,4, erkeklerin telefonla geçirdiği
süre günlük ortalama 5,21 ± 1,2 saat, cep telefonu bağımlılığı ölçeği puanı
ortalaması 41,7 ± 4,9 idi. 80 katılımcının 51’i dikkat eksikliği hiperaktivite
bozukluğu (DEHB), 35’i anksiyete bozuklukları, 25’i depresyon, 9’u davranım
bozukluğu,3’ü dışa atım bozuklukları, 2’si tik bozukluğu tanılarını aldılar.
Erkek hastalar, DEHB(%82), anksiyete bozuklukları (%29), depresyon (%19),
davranım bozuklukları (%19), dışa atım bozuklukları (%6), tik bozuklukları (%4)
tanılarını aldılar. Kız hastalar ise sırasıyla, anksiyete bozuklukları (%63),
depresyon (%48), DEHB (%36) tanılarını aldılar. Cinsiyete göre DEHB, anksiyete
bozuklukları, depresyon ve davranım bozuklukları dağılımı açısından
istatistiksel anlamlı farklılık vardır ( p &lt; 0.05). DEHB ve davranım
bozukluğu oranı erkeklerde daha fazla iken, anksiyete bozuklukları ve
depresyon oranı kızlarda daha fazla
bulundu. Sonuç: Akıllı telefon bağımlılığı depresyonu ve anksiyete
bozukluğu olan kız ergenlerde yüksek oranda iken, erkek ergenlerde ise DEHB’ye
yüksek oranda eşlik etmiştir. Bu yüzden akıllı telefon bağımlılığı olan çocuk
ve ergenlerin, psikiyatrik hastalıklar açısından değerlendirilip gerekli tedavi
ve desteğinin sağlanması gerekmektedir. Ayrıca akıllı telefonların önerilen
sürelerde ve gerekli durumlarda kullanılmasının sağlanması, çocuk ve ergenlerin
hem sosyal gelişimi, hem de ruh sağlığı açısından olumlu sonuçlar doğuracağını
düşünmekteyiz.

Anahtar
Kelimeler: Akıllı Telefon Bağımlılığı, Ergenlik,
Psikiyatrik Bozukluklar, Hiperaktivite, Depresyon
Design, synthesis and docking study of acyl thiourea derivatives as possible histone deacetylase inhibitors with a novel zinc binding group
Authors: Al-Amily Duraid H , Mohammed Mohammed H 
Published: August 2019

Histone deacetylase inhibitors with zinc binding groups often exhibit drawbacks like non-selectivity or toxic effects. Thus, there are continuous efforts to modify the currently available inhibitors or to discover new derivatives to overcome these problems. One approach is to synthesize new compounds with novel zinc binding groups.
The present study describes the utilization of acyl thiourea functionality, known to possess the ability to complex with metals, to be a novel zinc binding group incorporated into the designed histone deacetylase inhibitors. N-adipoyl monoanilide thiourea (4) and N-pimeloyl monoanilide thiourea (5) have been synthesized and characterized successfully. They showed good cytotoxicity against cancer cells with low cytotoxicity against normal cells. Their binding mode to the active site of histone deacetylases have been studied by docking study.
Two Terrestrial Planet Families with Different Origins
Authors: Swain Mark R. , Estrela Raissa , Sotin Christophe , Roudier Gael M. , Zellem Robert T. 
Published: August 2019

Abstract
The potentially important role of stellar irradiation in envelope removal for planets with diameters of ⪅2 R
⊕ has been inferred both through theoretical work and the observed bimodal distribution of small planet occurrence as a function of radius. We examined the trends for small planets in the three-dimensional radius–insolation–density space and found that the terrestrial planets divide into two distinct families based on insolation. The lower insolation family merges with terrestrial planets and small bodies in the solar system and is thus Earth-like. The higher insolation terrestrial planet family forms a bulk-density continuum with the sub-Neptunes, and is thus likely to be composed of remnant cores produced by photoevaporation. Based on the density–radius relationships, we suggest that both terrestrial families show evidence of density enhancement through collisions. Our findings highlight the important role that both photoevaporation and collisions have in determining the density of small planets.
Cosmological Simulations of Satellites around Isolated Dwarf Galaxies
Authors: Chun Kyungwon , Shin Jihye , Smith Rory , Kim Sungsoo S. 
Published: August 2019

Abstract
We trace the cosmological origin of satellites around a dwarf galaxy using a very high-resolution (12 pc/h) cosmological hydrodynamic zoom simulation. To realistically describe the formation and evolution of small-mass stellar satellites, our model includes a full baryonic physics treatment including a recipe for UV self-shielding. We find that the majority of their star-forming gas is accreted after reionization, thus the survival of a mini-halo gas to reionization is not an important factor. Instead, the key factor seems to be the ability for a mini-halo to cool its recently accreted gas, which is more efficient in more massive halos. We find that halos in denser environments suffer more mergers, enabling them to grow their mass such that cooling of accreted gas can occur efficiently. Although the host galaxy is only a dwarf galaxy itself, we find that ram pressure is an efficient means by which accreted mini-halos lose their gas content, both by interacting with hot halo gas but also in direct collisions with the gas disk of the host. The satellites are also disrupted by the tidal forces near the center of the host galaxy. In summary, our results suggest that the characteristics of satellites are mainly determined by their ability to efficiently cool gas that is accreted in the redshift range of z = 3–5, prior to their infall into the host galaxy.
Tidal Disruption Events in Active Galactic Nuclei
Authors: Chan Chi-Ho , Piran Tsvi , Krolik Julian H. , Saban Dekel 
Published: August 2019

Abstract
A fraction of tidal disruption events (TDEs) occur in active galactic nuclei (AGNs) whose black holes possess accretion disks; these TDEs can be confused with common AGN flares. The disruption itself is unaffected by the disk, but the evolution of the bound debris stream is modified by its collision with the disk when it returns to pericenter. The outcome of the collision is largely determined by the ratio of the stream mass current to the azimuthal mass current of the disk rotating underneath the stream footprint, which in turns depends on the mass and luminosity of the AGN. To characterize TDEs in AGNs, we simulated a suite of stream–disk collisions with various mass current ratios. The collision excites shocks in the disk, leading to inflow and energy dissipation orders of magnitude above Eddington; however, much of the radiation is trapped in the inflow and advected into the black hole, so the actual bolometric luminosity may be closer to Eddington. The emergent spectrum may not be thermal, TDE-like, or AGN-like. The rapid inflow causes the disk interior to the impact point to be depleted within a fraction of the mass return time. If the stream is heavy enough to penetrate the disk, part of the outgoing material eventually hits the disk again, dissipating its kinetic energy in the second collision; another part becomes unbound, emitting synchrotron radiation as it shocks with surrounding gas.
A Longitudinally Asymmetrical Kink Oscillation of Coronal Loop Caused by a Diagonally Placed Flare below the Loop System
Authors: Li Hongbo , Feng Hengqiang , Liu Yu , Tian Zhanjun , Huang Jin , Miao Yuhu 
Published: August 2019

Abstract
Although fast kink oscillations of coronal loops have been extensively studied for decades, details about their excitation, evolution, and damping remain elusive. Here, we present, for the first time, a longitudinally asymmetrical fast kink oscillation of a coronal loop that is excited by a GOES C-class flare located diagonally below the loop system. In this case, a damping-like phase and a growing-like phase are successively observed after the flare in different loop segments that are far from and close to the flare site, respectively. The investigation provides us with a new and valuable clue for the widely observed distinct deviations of fast kink oscillations from the sinusoidal pattern, especially for the local damping-like or growing-like phases associated with diagonally placed excitation sources, by illuminating a probable effect of the diagonally placed excitation source.
Joint X-Ray, EUV, and UV Observations of a Small Microflare
Authors: Hannah Iain G. , Kleint Lucia , Krucker Säm , Grefenstette Brian W. , Glesener Lindsay , Hudson Hugh S. , White Stephen M. , Smith David M. 
Published: August 2019

Abstract
We present the first joint observation of a small microflare in X-rays with the Nuclear Spectroscopic Telescope ARray (NuSTAR), in UV with the Interface Region Imaging Spectrograph (IRIS), and in EUV with the Solar Dynamics Observatory/Atmospheric Imaging Assembly (SDO/AIA). These combined observations allow us to study the hot coronal and cooler chromospheric/transition region emission from the microflare. This small microflare peaks from 2016 July 26 23:35 to 23:36 UT, in both NuSTAR, SDO/AIA, and IRIS. Spatially, this corresponds to a small loop visible in the SDO/AIA Fe xviii emission, which matches a similar structure lower in the solar atmosphere seen by IRIS in SJI1330 and 1400 Å. The NuSTAR emission in both 2.5–4 and 4–6 keV is located in a source at this loop location. The IRIS slit was over the microflaring loop, and fits show little change in Mg ii but do show intensity increases, slight width enhancements, and redshifts in Si iv and O iv, indicating that this microflare had most significance in and above the upper chromosphere. The NuSTAR microflare spectrum is well fitted by a thermal component of 5.1 MK and 6.2 × 1044 cm−3, which corresponds to a thermal energy of 1.5 × 1026 erg, making it considerably smaller than previously studied active region microflares. No non-thermal emission was detected but this could be due to the limited effective exposure time of the observation. This observation shows that even ordinary features seen in UV can remarkably have a higher-energy component that is clear in X-rays.
New Constraints on the Dust and Gas Distribution in the LkCa 15 Disk from ALMA
Authors: Jin Sheng , Isella Andrea , Huang Pinghui , Li Shengtai , Li Hui , Ji Jianghui 
Published: August 2019

Abstract
We search a large parameter space of the LkCa 15's disk density profile to fit its observed radial intensity profile of 12CO (J = 3–2) obtained from Atacama Large Millimeter/submillimeter Array. The best-fit model within the parameter space has a disk mass of 0.1 M
⊙ (using an abundance ratio of 12CO/H2 = 1.4 × 10−4 in mass), an inner cavity of 45 au in radius, an outer edge at ∼600 au, and a disk surface density profile that follows a power law of the form ρ

r
∝ r
−4. For the disk density profiles that can lead to a small reduced χ
2 of the goodness-of-fit, we find that there is a clear linear correlation between the disk mass and the power-law index, γ, in the equation of the disk density profile. This suggests that the 12CO disk of LkCa 15 is optically thick, and we can fit its 12CO radial intensity profile using either a lower disk mass with a smaller γ or a higher disk mass with a bigger γ. By comparing the 12CO channel maps of the best-fit model with disk models with higher or lower masses, we find that a disk mass of ∼0.1 M
⊙ can best reproduce the observed morphology of the 12CO channel maps. The dust continuum map at 0.87 mm of the LkCa 15 disk shows an inner cavity of the similar size of the best-fit gas model, but its outer edge is at ∼200 au, which is much smaller than the fitted gas disk. Such a discrepancy between the outer edges of the gas and dust disks is consistent with dust drifting and trapping models.
Study of High-temperature Emission in Solar Active Regions
Authors: Asgari-Targhi M. , Ballegooijen A. A. van , Davey A. R. 
Published: August 2019

Abstract
The high-temperature (T > 4 MK) emissions of nonflaring active regions are investigated in the context of the coronal heating problem. We study the role of emerging flux, nonpotential magnetic fields, and sunspots in the heating of active-region loops. Using extreme ultraviolet images from the Atmospheric Imaging Assembly on the Solar Dynamic Observatory (SDO), we construct intensity maps in Fe xviii 94 Å for 48 active regions. We also use the corresponding magnetograms from the Helioseismic and Magnetic Imager on SDO to measure the total magnetic flux. The Fe xviii 94 Å emission intensity of the brightest loops is found to be correlated with the presence of sunspots and emerging or canceling magnetic flux in the photosphere below. We conclude that sunspots and emerging flux play an important role in the process of coronal heating and the production of high-temperature plasmas. We suggest that energy may be injected into the corona as a result of the dynamics of magnetic fields associated with sunspots and/or emerging flux. These processes may cause the large magnetic disturbances (δB
⊥ ∼ 10 G) needed to produce strong nanoflare-heating events.
Narrow Absorption Lines Complex. III. Gradual Transition from Type S to Type N Broad Absorption Line
Authors: Lu 陆伟 Wei-Jian 坚 , Lin 林樱 Ying-Ru 如 
Published: August 2019

Abstract
We study the relationship between the broad absorption lines (BALs) that can be decomposed into multiple narrow absorption lines and those that cannot (hereafter Type N and Type S BAL, respectively), based on the analysis of three BAL systems (systems A, B, and C) in two-epoch spectra of quasar SDSS J113009.40+495247.9 (hereafter J1130+4952). As the velocity decreases (from systems A to C), these three BAL systems show a gradual transition from Type S to Type N BAL, and their equivalent widths (EWs) and profile shapes vary in a regular way. We ascribe the absorption line variability in J1130+4952 to the ionization change as a response to the fluctuation of the ionizing continuum based on several factors: (1) coordinated EW strengthening over a wide range in systems A and B, (2) the system B shows an obvious change in Si iv but no significant change in C iv BAL, and (3) asynchronized variability between the continuum and absorption lines. Based on the analysis of the variation mechanism, location, ionization state, and structure of systems A, B, and C, we hold the view that the Type S and Type N BALs in J1130+4952 probe the same clumped outflow, with the Type S BALs originating from the inner part of the outflow with a relatively higher ionization state, smaller column density, and more clumpy structures, while the Type N BALs originate from the outer part of the outflow with relatively lower ionization state, larger column density, and fewer clumpy structures.
Solar Models with Convective Overshoot, Solar-wind Mass Loss, and PMS Disk Accretion: Helioseismic Quantities, Li Depletion, and Neutrino Fluxes
Authors: Zhang Qian-Sheng , Li Yan , Christensen-Dalsgaard Jørgen 
Published: August 2019

Abstract
Helioseismic observations have revealed many properties of the Sun: the depth and helium abundance of the convection zone, the sound speed, and the density profiles in the solar interior. Those constraints have been used to judge the stellar evolution theory. With the old solar composition (e.g., GS98), the solar standard model is in reasonable agreement with the helioseismic constraints. However, a solar model with a revised composition (e.g., AGSS09) with a low abundance Z of heavy elements cannot be consistent with those constraints. This is the so-called “solar abundance problem,” standing for more than 10 yr even with the recent upward revised Ne abundance. Many mechanisms have been proposed to mitigate the problem. However, there is still no low-Z solar model satisfying all helioseismic constraints. In this paper, we report a possible solution to the solar abundance problem. With some extra physical processes that are not included in the standard model, solar models can be significantly improved. Our new solar models with convective overshoot, the solar wind, and early mass accretion show consistency with helioseismic constraints, the solar Li abundance, and observations of solar neutrino fluxes.
Multiple Components of the Jhelum Stellar Stream
Authors: Bonaca Ana , Conroy Charlie , Price-Whelan Adrian M. , Hogg David W. 
Published: August 2019

Abstract
In simple models of the Milky Way, tidally disrupting satellites produce long and thin—nearly one-dimensional—stellar streams. Using astrometric data from the Gaia second data release and photometry from the Dark Energy Survey, we demonstrate that the Jhelum stream, a stellar stream in the inner halo, is a two-dimensional structure. The spatial distribution of highly probable Jhelum members reveals a dense thin component and an associated diffuse, spatially offset component. These two spatial components have indistinguishable proper motions (at σ ∼ 1 mas yr−1 level) and a similar ratio of blue straggler to blue horizontal branch stars, which indicates a common origin for the two components. The best-fit orbit to the narrow component (pericenter 8 kpc, apocenter 24 kpc), however, does not explain the wide component of the Jhelum stream. On the other hand, an older orbital wrap of Jhelum’s orbit traces the Indus stream, indicating a possible connection between these two structures and additional complexity in Jhelum’s formation. Substructure in the Jhelum progenitor or precession of its tidal debris in the Milky Way potential may explain the observed structure of Jhelum. Future spectroscopic data will enable discrimination between these “nature” and “nurture” formation scenarios. Jhelum adds to the growing list of cold stellar streams that display complex morphologies and promise to reveal the dynamical history of the Milky Way.