bluuebunny/crossref_metadata_2025_split huggingface dataset:
La zaïrite, un nouveau minéral appartenant à la série de la crandallite
Authors: Van Wambeke L. 
Published: August 2019

Ce nouveau minéral de couleur verdâtre trouvé dans la zone d'altération superficielle de filons de quartz minéralisé en wolfram à Eta-Etu, Kivu, République du Zaïre, est l'équivalent ferrifère de la waylandite. Sa formule structurale dérivée d'une analyse chimique est :
[Bi₀,₇₆ (Ba, Ca, Cu, Zn)₀,₂₃ H₀,₂₃] [Fe₂,₃₈ Al₀,₆₅ [(PO₄)₁,₉₁ (XO₄)₀,₀₉] (OH)₆
avec X = Si, S, Te, H₄. La zaïrite appartient à la série de la crandallite, groupe spatial R[-3]m (rhomboédrique). Ses paramètres sont : a₀ = 7,015 ± 0,005 Å et c₀ = 16,365 ± 0,015 Å avec Z = 3. Sa densité calculée est 4,42 ± 0,03 (densité mesurée : 4,37 ± 0,05). Au microscope, le minéral est uniaxe négatif et ses indices de réfraction compris entre 1,82 et 1,83.
Structure cristalline d'un sulfure mixte d'uranium et d'ytterbium de formule U3,7Yb10,8S22
Authors: Rodier Noël , Vovan Tien 
Published: August 2019

This sulphide crystallizes in monoclinic system, spatial group B2/m. It has the same crystal structure as Ce₄Lu₁₁S₂₂. The unit cell has the dimensions : a = 38.39 (2) Å, b = 11.165 (5) Å, c = 3.878 (2) Å et γ = 91.16 (5)° and it contains two formula units. R = 0.063. Each of the two metals takes two degrees of oxydation,
III and IV for uranium, II and III for ytterbium. Four metallic sites are partly non-occupied.
Etudes par diffraction de neutrons de la phase Mn5SiC et des solutions solides (Mn1˗xMox)5SiC, (Mn1˗xFex)5SiC. Propriétés structurales et magnétiques
Authors: Spinat Pierre , Herpin Paulette 
Published: August 2019

The carbon atomic coordinates have been refined from neutron diffraction pattern on powder at the ambient temperature. These carbon atoms are located in the center of right prisms whose the bases are triangular. The Mn₅SiC phase is related to intermetallic complex phases by the structural design and belongs to the family of cementite carbides by the neighbourhood of carbon.
The neutron diffraction of the solid solutions allowed to show that the substitution of manganese by a transition metal takes place in different sites according to the size of the substituent atom.
Magnetic studies and neutron diffraction at low temperature have shown that magnetic properties change in a remarkable way when in solid solutions, especially with molybdenum, but the magnetic structure, with two lattices, presents a great complexity.
Les minéraux à couches mixtes synthétiques de type smectite˗phyllite
Authors: Triboulet Claude 
Published: August 2019

Synthetic mixed-layered saponite-chlorite, saponite-paragonite, saponite-talc, which appear in the Na₂O-Al₂O₃-MgO-SiO₂-H₂O system at low pressures (< 3 kbars) and average temperatures (380 to 700° C) have been studied by X-ray diffraction. Criteria of random, ordered organization, and determination of the x/y quantitative ratio of the two intercrystallized phases are given.
Ordered saponite-chlorite appears in a large compositional field (0,25 < Al/Al + Mg + Si < 0,5) at low pressure. It corresponds to solid solution between saponite and chlorite. Its stability field narrows with increasing pressure. Ordered saponite-paragonite and saponite-talc are more restricted by global compositions.
Physical therapy of middle-aged women after the hip joint replacement
Authors: Bezyazychna O.V. , Manucharyan S.V. , Dugina L.V. 
Published: August 2019

The purpose of the work: development and experimental substantiation of a physical therapy program for middle-aged women after the hip joint replacement.
Material and methods. 22 middle-aged women after hip joint replacement (the non-cement form of fixation of the prosthesis components) during the training period took part in the experiment; they were divided into two groups, experimental and control one, 11 people in each. Women in the experimental group underwent physical therapy measures according to the author's program, and women of the control group underwent it according to the physical therapy program for individuals after the hip joint replacement.
Pedagogical and medico-biological studies were conducted for 3 months. Primary and repeated study involved clinical methods (history collection, physical examination); assessment of the quality of life, as well as medical and pedagogical observations in the process of remedial gymnastics and mathematical statistics methods.
Results. We present the program of physical therapy using remedial gymnastics based on step-down exercises with visual control and exercises with an elastic band on a healthy leg for balance training; therapeutic massage; physiotherapy according to conventional methods, namely: electromyostimulation; laser therapy.
Conclusion. In the course of the study conducted, we came to the conclusion that the program of physical therapy for middle-aged women after hip joint replacement in the training period, developed and implemented in the Utility Non-Profit Enterprise of Kharkiv Oblast Council "Oblast Clinical Hospital" has allowed to increase the efficacy of rehabilitation; it is available to all specialized rehabilitation centers, and deserves a wide-scale implementation into practice.
MODEL PENDAMPINGAN GURU DALAM MENGHADAPI PELAKSANAAN UJIAN NASIONAL MATEMATIKA DI SEKOLAH INKLUSIF
Authors: Ikhwanudin Trisno 
Published: August 2019

Memandang strategisnya posisi ujian nasional, khususnya dalam mata pelajaran matematika, dirasakan perlu dikembangkan suatu model pendampingan guru dalam menghadapi pelaksanaan Ujian Nasional pada mata pelajaram Matematika di Sekolah Inklusi. Model pendampingan guru ini diawali dengan proses tes diagnostik kepada siswa kelas XII atau kelas 3 SMA Inklusi. Selanjutnya hasil tes diagnostik akan dikomunikasikan dengan guru matematika sekolah bersangkutan. Hasil tes diagnostik itu memuat kekuatan dan kelemahan siswa, dalam arti pokok bahasan/sub pokok bahasan apa saja yang dikuasai dan kurang dikuasai oleh siswa. Selanjutnya berdasarkan kelemahan siswa tersebut dilakukan treatmen terhadap guru. Dalam kegiatan treatmen tersebut, guru diberi input materi tentang metode atau strategi pembelajaran untuk menyelesaikan masalah/soal pada pokok bahasan yang kurang dikuasai oleh siswa. Selanjutnya guru mengaplikasikan metode atau strategi tersebut di kelas. Dalam kurun waktu tertentu, siswa diuji kembali dengan soal yang mengacu pada Standar Kompetensi Lulusan (SKL) Ujian Nasional dan proses diatas berulang kembali sebanyak 2 – 3 putaran sebelum pelaksanaan Ujian Nasional. Kata Kunci: Model pendampingan guru, Ujian Nasional, Tes diagnostik, Treatmen
SURVEY OF THE INTEREST LEVELS OF KHMER STUDENTS AT TRA VINH UNIVERSITY ON CRITICAL THINKING SKILL (The case of School of Southern Khmer Language, Culture and Arts)
Authors: Phan Ly Thi My 
Published: August 2019

The study was conducted to explore the interest levels and the understanding of Khmer students at Tra Vinh University (The case of School of Southern Khmer Language, Culture and Arts). The survey results on 114 first-year to fourth-year students of the majors: Cultural Vietnamese Ethnic Minorities, Khmer language, Pedagogy of Southern Literature show that 70% of students are interested in critical thinking. Students realize that this is the necessary thinking for the learners themselves when there are 32.46% totally agree and 54.39% agree to develop critical thinking skills. Based on the results, we initially try to find out the causes and propose the solutions to develop critical thinking skills for students.
SOLUTIONS FOR INTEGRATING SOFT SKILLS INTO TRAINING HUMAN RESOURCES FOR TOURISM IN INDUSTRIAL REVOLUTION 4.0
Authors: Nguyen Thanh Tan 
Published: August 2019

The "4.0 industrial revolution" brings many opportunities and challenges not only for the Vietnam’s economy, but also for the tourism industry. Thereby, a set of urgent issues of the importance of soft skills and solutionsfor integration of soft skills in training tourism human resources were set up. Along with the 4.0 industrial revolution, the development of cognitive thinking and adaptability to the working environment are essential elements. In order to do that, besides gaining professional knowledge, engaging in education and experiences, students need to be flexible equiped appropriate soft skills for job applications. A desk review method and a reality survey were conducted to clarify the characteristics and roles of soft skills in training human resources for tourism in the challenging conditions of the 4.0 industrial revolution. From this, recommendations and solutions were proposed to integrate soft skills in training tourism human resources in the 4.0 revolutionary era.
SOLUTIONS FOR IMPROVING THE QUALITY OF INTEGRATING SOFT SKILLS INTO TEACHING SPECIALIZED KNOWLEDGE AT TRA VINH UNIVERSITY
Authors: Phan Nam Thi Phuong , Huynh Dung Thi My 
Published: August 2019

This article analyzes essential conditions for integrating soft skills into teaching specialized knowledge. The data was surveyed on 529 college and university level students from 1st to 4th year of five faculties at Tra Vinh University. The results show that there are 401 students (76%) agreing that the number of a soft skills class with 15 to 25 students is appropriate; Besides, in order to organize students’ interest in learning soft skills and learning effectively, teachers need to combine many methods and means: lectures, projectors, group activities, pictures, photos, tables (rate of 46%) and organized outdoor classes account for 47%; teaching methods and teaching equipments relatively meet students’ learning needs.
SOLUTIONS FOR STUDENTS OF TRA VINH UNIVERSITY TO IMPROVE TIME MANAGEMENT SKILLS
Authors: Nguyen Thu Anh , Huynh Nhung Thi Hong 
Published: August 2019

Time management skills are one of the most important soft skills for university students. Nowaday, some universities in Vietnam have introduced this skill into teaching soft skills, including Tra Vinh University. Time management skills determine the majority of students’ learning outcomes. However, in fact, not many students are aware of this. By questionnaires and indepth interviews conducted in May 2019. The authors present the reality of time management skills of the Tra Vinh University students, thereby proposing solutions of integrating time management skills into teaching specialized knowledge to improve the students’ learning quality at Tra Vinh University.
Memoirs of a Giant Planet
Authors: Wu Yanqin , Lithwick Yoram 
Published: August 2019

Abstract
Saturn is ringing weakly. Exquisite data from the Cassini mission reveal the presence of f-mode oscillations as they excite density waves in Saturn’s rings. These oscillations have displacement amplitudes of order 1 m on Saturn’s surface. We propose that they result from large impacts in the past. Experiencing little dissipation inside Saturn on account of its weak luminosity, f-modes may live virtually forever, but the very ring waves that reveal their existence also remove energy from them, in 104 to 107 yr for the observed f-modes (spherical degree 2–10). We find that the largest impacts that arrive during these times excite the modes to their current levels, with the exception of the few lowest-degree modes. To explain the latter, either a fortuitously large impact in the recent past or a new source of stochastic excitation is needed. We extend this scenario to Jupiter, which has no substantial rings. With an exceedingly long memory of past bombardments, Jovian f-modes and p-modes can acquire much higher amplitudes, possibly explaining past reports of radial velocity detections, and are potentially detectable by the Juno spacecraft.
Toward Rate Estimation for Transient Surveys. I. Assessing Transient Detectability and Volume Sensitivity for iPTF
Authors: Chatterjee Deep , Nugent Peter E. , Brady Patrick R. , Cannella Chris , Kaplan David L. , Kasliwal Mansi M. 
Published: August 2019

Abstract
The past couple of decades have seen an emergence of transient detection facilities in various avenues of time-domain astronomy that have provided us with a rich data set of transients. The rates of these transients have implications in star formation, progenitor models, evolution channels, and cosmology measurements. The crucial component of any rate calculation is the detectability and spacetime volume sensitivity of a survey to a particular transient type as a function of many intrinsic and extrinsic parameters. Fully sampling that multidimensional parameter space is challenging. Instead, we present a scheme to assess the detectability of transients using supervised machine learning. The data product is a classifier that determines the detection likelihood of sources resulting from an image subtraction pipeline associated with time-domain survey telescopes, taking into consideration the intrinsic properties of the transients and the observing conditions. We apply our method to assess the spacetime volume sensitivity of type Ia supernovae (SNe Ia) in the intermediate Palomar Transient Factory (iPTF) and obtain the result,

. With rate estimates in the literature, this volume sensitivity gives a count of 680–1160 SNe Ia detectable by iPTF, which is consistent with the archival data. With a view toward wider applicability of this technique we do a preliminary computation for long-duration type IIp supernovae (SNe IIp) and find

. This classifier can be used for computationally fast spacetime volume sensitivity calculation of any generic transient type using their light-curve properties. Hence, it can be used as a tool to facilitate calculation of transient rates in a range of time-domain surveys, given suitable training sets.
Probing the Gas Content of Late-stage Protoplanetary Disks with N2H+
Authors: Anderson Dana E. , Blake Geoffrey A. , Bergin Edwin A. , Zhang Ke , Carpenter John M. , Schwarz Kamber R. , Huang Jane , Öberg Karin I. 
Published: August 2019

Abstract
The lifetime of gas in circumstellar disks is a fundamental quantity that informs our understanding of planet formation. Studying disk gas evolution requires measurements of disk masses around stars of various ages. Because H2 gas is unobservable under most disk conditions, total disk masses are based on indirect tracers such as sub-mm dust and CO emission. The uncertainty in the relation between these tracers and the disk mass increases as the disk evolves. In a few well-studied disks, CO exhibits depletions of up to 100× below the assumed interstellar value. Thus, additional tracers are required to accurately determine the total gas mass. The relative lack of nitrogen found in solid solar system bodies may indicate that it persists in volatile form, making nitrogen-bearing species more robust tracers of gas in more evolved disks. Here we present Atacama Large Millimeter/submillimeter Array detections of N2H+ in two mature, ∼5–11 Myr old disks in the Upper Scorpius OB Association. Such detections imply the presence of H2-rich gas and sources of ionization, both required for N2H+ formation. The Upper Sco disks also show elevated N2H+/CO flux ratios when compared to previously observed disks with ≳10× higher CO fluxes. Based on line ratio predictions from a grid of thermochemical disk models, a significantly reduced CO/H2 abundance of <10−6 for a gas-to-dust ratio of ≳100 is required to produce the observed N2H+ fluxes. These systems appear to maintain H2 gas reservoirs and indicate that carbon- and nitrogen-bearing species follow distinct physical or chemical pathways as disks evolve.
Reduced Order Estimation of the Speckle Electric Field History for Space-based Coronagraphs
Authors: Pogorelyuk Leonid , Kasdin N. Jeremy , Rowley Clarence W. 
Published: August 2019

Abstract
In high-contrast space-based coronagraphs, one of the main limiting factors for imaging the dimmest exoplanets is the time-varying nature of the residual starlight (speckles). Modern methods try to differentiate between the intensities of starlight and other sources, but none incorporate models of space-based systems that can take into account actuations of the deformable mirrors (DMs). Instead, we propose formulating the estimation problem in terms of the electric field while allowing for dithering of the DMs. Our reduced-order approach is similar to intensity-based PCA (e.g., KLIP) although, under certain assumptions, it requires a considerably lower number of modes of the electric field. We illustrate this by a FALCO simulation of the Wide-field Infra-red Survey Telescope hybrid Lyot coronagraph (the data and the comparison code are available at https://github.com/leonidprinceton/EFOR).
Chasing Star–Planet Magnetic Interactions: The Case of Kepler-78
Authors: Strugarek A. , Brun A. S. , Donati J.-F. , Moutou C. , Réville V. 
Published: August 2019

Abstract
Observational evidence of star–planet magnetic interactions (SPMIs) in compact exosystems have been looked for in the past decades. Indeed, planets in close-in orbit can be magnetically connected to their host star and can channel Alfvén waves carrying large amounts of energy toward the central star. The strength and temporal modulation of SPMIs are primarily set by the magnetic topology of the host star and the orbital characteristics of the planet. As a result, SPMI signals can be modulated over the rotational period of the star, the orbital period of the planet, or a complex combination of the two. The detection of SPMIs thus has to rely on multiple-epoch and multiple-wavelength observational campaigns. We present a new method to characterize SPMIs and apply it to Kepler-78, a late G star with a super-Earth on an 8.5 hr orbit. We model the corona of Kepler-78 using the large-scale magnetic topology of the star observed with Zeeman–Doppler imaging. We show that the closeness of Kepler-78b allows the interaction with channel energy flux densities up to a few kW m−2 toward the central star. We show that this flux is large enough to be detectable in classical activity tracers such as Hα. It is nonetheless too weak to explain the modulation observed by Moutou et al. We furthermore demonstrate how to predict the temporal modulation of SPMI signals in observed systems such as Kepler-78. The methodology presented here thus paves the way toward denser, more specific observational campaigns that would allow proper identification of SPMIs in compact star–planet systems.
New Hot Subdwarf Stars Identified in Gaia DR2 with LAMOST DR5 Spectra. II.
Authors: Lei Zhenxin , Zhao Jingkun , Németh Péter , Zhao Gang 
Published: August 2019

Abstract
Three hundred and eighty eight hot subdwarf stars have been identified by using the Hertzsprung–Russell (HR) diagram built from the second data release of the Gaia mission. By analyzing their observed Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) spectra, we characterized 186 sdB, 73 He-sdOB, 65 sdOB, 45 sdO, 12 He-sdO, and 7 He-sdB stars. The atmospheric parameters of these stars (e.g., T
eff, logg, log(nHe/nH)) are obtained by fitting the hydrogen (H) and helium (He) line profiles with synthetic spectra calculated from non-local thermodynamic equilibrium model atmospheres. Among these stars, we have 135 new identified hot subdwarfs which have not been cataloged before. Although 253 stars appear in the catalog by Geier et al., only 91 of them have atmospheric parameters. Together with the 294 hot subdwarf stars found by Lei et al., we identified 682 hot subdwarf stars in total by using the Gaia HR-diagram and LAMOST spectra. These results demonstrate the efficiency of our method to combine large surveys to search for hot subdwarf stars. We found a distinct gap in our He-sdOB stars based on their He abundance, which is also presented in extreme horizontal branch (EHB) stars of the globular cluster ω Cen. The number fraction of the sample size for the two subgroups is very different between the two counterparts. However, the distinct gap between the H-sdB stars and He-sdOB stars in ω Cen is not visible in our sample. More interestingly, the He-sdB population with the highest He abundance in our sample is completely missing in ω Cen. The discrepancy between our field hot subdwarf stars and the EHB stars in ω Cen indicate different origins for the two counterparts.
Dynamical Properties of Merging Galaxy Clusters from Simulated Analogs
Authors: Wittman David 
Published: August 2019

Abstract
Merging galaxy clusters may provide a unique window into the behavior of dark matter and the evolution of member galaxies. To interpret these natural collider experiments, we must account for how much time has passed since pericenter passage (TSP), the maximum relative speed of the merging subclusters, merger phase (outbound after first pericenter or returning for second pericenter), and other dynamical parameters that are not directly observable. These quantities are often inferred from staged simulations or analytical timing arguments that include neither substructure, nor large-scale structure, nor a cosmologically motivated range of impact parameters. We include all these effects by extracting dynamical parameters from analog systems in a cosmological n-body simulation, and we present constraints for 11 observed systems. The TSP and viewing angles we derive are consistent with those of staged hydrodynamical simulations, but we find lower maximum speeds. Compared to the analytical MCMAC method, we find lower TSP and viewing angles that put the separation vector closer to the plane of the sky; we attribute this to the MCMAC assumption of zero pericenter distance. We discuss potential extensions to the basic analog method, as well as complementarities between methods.
Hot Hydrogen Climates Near the Inner Edge of the Habitable Zone
Authors: Koll Daniel D. B. , Cronin Timothy W. 
Published: August 2019

Abstract
Young terrestrial planets can capture or outgas hydrogen-rich atmospheres with tens to hundreds of bars of H2, which persist for 100 Myr or longer. Although the earliest habitable conditions on Earth and terrestrial exoplanets could thus arise while the atmosphere is still dominated by H2, the climatic effects of H2 remain poorly understood. Previous work showed that H2 induces strong greenhouse warming at the outer edge of the habitable zone. Here we use a 1D radiative–convective model to show that H2 also leads to strong warming near the inner edge of the habitable zone. Unlike H2's greenhouse warming at the outer edge, however, its effect near the inner edge is driven by thermodynamics: H2's large thermal scale height allows the atmosphere to store more water vapor than either a pure H2O atmosphere or an atmosphere with a heavy background gas, such as N2 or CO2, thereby amplifying the greenhouse effect of H2O. Using idealized gray calculations, we then present a general argument for how different background gases affect the inner edge of the habitable zone. H2 stands out for its ability to induce novel “soufflé” climates, which further support its warming effect. Our results show that if the earliest conditions on a planet near the inner edge of the habitable zone were H2-rich, they were likely also hot: 1 bar of H2 is sufficient to raise surface temperatures above 340 K, and 50 bar of H2 are sufficient to raise surface temperatures above 450 K.