bluuebunny/crossref_metadata_2025 huggingface dataset:
Hubungan Pengetahuan, Situasi, Sikap Dan Motivasi Dengan Keputusan Pembelian Laptop
Authors: Hami Bruno , Inggawati V. Ratna
Published: August 2020

The study aims to obtain empirical information that knowledge, situation, attitude and motivation have positive relationship simultaneously and partially with laptop purchasing decision from students of Economic Faculty of Catholic University Darma Cendika Surabaya. Problems and hypothesis are formulated based on references and empirical studies. To test the hypothesis used regression conversion F test (linearitan) to determine whether the relationship between the dependent variable with the independent variable is linear or not. The correlation coefficient test is used to determine the size of the correlation coefficient whether significant or not. Population in this research is students of Economic Faculty of Catholic University Darma Cendika Surabaya with amount of sample counted 100 people. The end result of the study shows that the partial correlation test shows: (i) knowledge has a correlation coefficient of 0,034 with significance of 0,738 > 0,05, meaning the correlation coefficient is not significant; (ii) the situation has a correlation coefficient of 0,365 with significant 0,00 < 0,05, meaning significant correlation coefficient; (iii) attitude of having correlation coefficient 0,416 with significance 0,00 < 0,05, meaning significant correlation coefficient; and (iv) motivation has a correlation coefficient of 0,232 with a significance of 0,022 < 0,05, meaning the correlation coefficient is significant. Simultaneously, the dependent variable relation (X) with independent variable (Y) is positive with adjusted R Square (R2) of 0,428 which means that 42,8% purchase decision of laptop students of Economic Faculty of Catholic University Darma Cendika Surabaya can be explained by the four dependent variables, while the remaining 57,2% of the decision to purchase laptop students of Economic Faculty of Catholic University Darma Cendika Surabaya can be explained by other variables outside of the four dependent variables currently being studied.
Analisis Perbedaan Pengakuan Pendapatan Menggunakan Metode Kontrak Selesai Dan Metode Persentase Penyelesaian
Authors: Susanto Alfonsus Herry , Rono Soedjono
Published: August 2020

Percentage of Completion Method help the company in the financial system of the company in one period may have more than one contract because this method shows the income statement as fair. Revenue recognition with the Percentage of Completion Method using a proper approach to matching concept (compare the costs and revenue appropriately) is the most appropriate method for long term contracts because it can describe the income statement in each period can be reported proportionately and fairly. For short term contracts, companies can use the method of revenue recognition based on the Completed Contract Method or the Percentage of Completion Method with the terms of the contract occurred less than or not more than one accounting period, because if more than one period and using the Completed Contract Method, it can cause report income that is not fair. Keep in mind that the Percentage of Completion Method has the disadvantage that if there is reduction or additional work in a contract, the percentage of work progress to be recalculated, and if there is a change estimated total cost, so the revenue recognized in the previous year must recalculated.
Experiential Marketing Wisata Taman Kota Surabaya
Authors: Tresyanto Citra Anggraini , Hami Bruno
Published: August 2020

The public need big cities nowadays are very complex. No exception to the needs of the people of Surabaya. One of the new needs of urban society is traveled. Traveled synonymous with waste of money. Not at this time, traveled enough to spend time with visiting the city park. Surabaya has a lot of city parks that can be utilized by the community. A total of 27 active city park owned by Surabaya. But unfortunately some of them, can be utilized by the community. Apart from that, the city park form a new lifestyle and needs in the community that traveled in a city park. Travelling in the city park provides an exciting experience. An interesting experience can be formed through a component in experiential marketing, namely sense, feel, think, act and relate that will describe a new experience as a result of a particular stimulus. Through experiential marketing also, the city government can find out what people felt after visiting the city and what is needed by the community. Proved that the city parks are built and design well, according to the needs and expectations of the community. This is clearly evident from the many community activities in the city park on the weekends.
Pengaruh Product Knowledge Dan Price Terhadap Keputusan Pembelian Konsumen Pada Produk The Capital
Authors: Halim Erni Saputri , Herdinata Christian
Published: August 2020

The purpose of this research is to identify the influence of product knowledge and price on the customer purchasing decision of product The Capital. The population of this study is all consumers of product The Capital. Convenience Sampling is used to select 45 samples. This study also uses quantitative methods. SPSS 16.0 is used as quantitative data analysis tool.Quantitative research results show that Product Knowledge and Price significantly influence the Customer Purchasing Decision of The Capital. The significant influence show that consumer with higher product knowledge will increase potential of purchasing decision of products The Capital.
PENERAPAN MODEL PEMBELAJARAN INKUIRI UNTUK MENINGKATKAN MOTIVASI DAN HASIL BELAJAR IPA SISWA KELAS VII SEMESTER II SMP NEGERI 7 NANGAPANDA TAHUN PELAJARAN 2018/2019
Authors: Selo Gu Maria Kristina , Kaleka Melkyanus Bili Umbu , Ika Yasinta Embu
Published: August 2020

Tujuan penelitian adalah untuk meningkatkan motivasi dan hasil belajar IPA siswa kelas VII semester II SMP Negeri 7 Nangapanda tahun pelajaran 2018/2019. Jenis penelitian yang digunakan adalah penelitian tindakan kelas yang dilaksanakan dalam 2 siklus. Subjek dalam penelitian ini adalah siswa kelas VII SMP Negeri 7 Nangapanda yang berjumlah 28 orang. Data penelitian ini diperoleh  dengan tenik observasi, teknik angket dan teknik tes. Teknik analisis data menggunakan analisis deskriptif yaitu menghitung nilai motivasi dan nilai hasil belajar siswa serta presentasi ketuntasan. Hasil penelitian menunjukkan  bahwa: 1) motivasi belajar siswa meningkat dari siklus I ke siklus II sebesar 22% (siklus I  terdapat 17 orang siswa tuntas dan pada siklus II meningkat menjadi 23 orang siswa). 2) Nilai hasil belajar siswa meningkat dari siklus I ke siklus II sebesar 18% (siklus I terdapat  19 orang siswa yang tuntas dan pada siklus II menjadi 24 orang siswa).
An atomic force microscope integrated with a helium ion microscope for correlative nanoscale characterization
Authors: Andany Santiago H , Hlawacek Gregor , Hummel Stefan , Brillard Charlène , Kangül Mustafa , Fantner Georg E
Published: August 2020

In this work, we report on the integration of an atomic force microscope (AFM) into a helium ion microscope (HIM). The HIM is a powerful instrument, capable of imaging and machining of nanoscale structures with sub-nanometer resolution, while the AFM is a well-established versatile tool for multiparametric nanoscale characterization. Combining the two techniques opens the way for unprecedented in situ correlative analysis at the nanoscale. Nanomachining and analysis can be performed without contamination of the sample and environmental changes between processing steps. The practicality of the resulting tool lies in the complementarity of the two techniques. The AFM offers not only true 3D topography maps, something the HIM can only provide in an indirect way, but also allows for nanomechanical property mapping, as well as for electrical and magnetic characterization of the sample after focused ion beam materials modification with the HIM. The experimental setup is described and evaluated through a series of correlative experiments, demonstrating the feasibility of the integration.
COFFEE PRODUCTION IN THE BRAZILIAN SAVANNAH: CONSIDERATIONS ABOUT NITROGEN NUTRITION
Authors: Pereira Bruno Isabeli , Meriguetti Pinto Victor , Reichardt Klaus
Published: August 2020

The Brazilian savannah, locally called “cerrado”, is a forest and shrub type ecosystem that occupied vast areas of very flat relief, mainly distributed in the central part of the country. In the mid 1970ies, this region was recognized as unfertile with little possibility of agricultural use. From there on, a large part of this biome was occupied by extensive agricultural production, due to the advances in technology. The coffee crop is very important for the Brazilian agribusiness, and in recent years, part of its cultivation has been shifted from the traditional growing areas (e.g. São Paulo and southern of Minas Gerais) to some cerrado areas (e.g. northwestern of Minas Gerais and western of Bahia). Cerrado has quite different edaphoclimatic conditions than the traditional coffee regions, and therefore crop management should be re-evaluated, including those concerning the nitrogen. This paper aims to review some studies already carried out on nitrogen fertilization in cerrado coffee plantations.
EFEITOS DA CORRENTE MICROGALVÂNICA E DA MICRODERMOABRASÃO PARA TRATAMENTO DE ESTRIAS ATRÓFICAS: REVISÃO DE LITERATURA
Authors: Ferreira Geisenely Vieira dos Santos
Published: August 2020

INTRODUÇÃO: A estria é uma atrofia tegumentar adquirida que modifica fibras colágenas, fibras elásticas, substância fundamental amorfa e fibroblastos. Os recursos definidos para esta pesquisa foram a microgalvanopuntura e a microdermoabrasão. OBJETIVOS: Analisar os efeitos terapêuticos da microgalvanopuntura e da microdermoabrasão no tratamento de estrias. METODOLOGIA: Na pesquisa fez-se uso de artigos publicados, nomeadamente banco de dados eletrônicos, sites de pesquisa e livros. Os artigos foram pesquisados no idioma português. Durante a coleta dos dados foram encontrados150 artigos e alguns capítulos de livros relacionados ao tema proposto. Destes, apenas 19 se enquadravam nos critérios de inclusão do estudo. Os descritores utilizados foram: Tratamentos estéticos, microgalvanopuntura, microdermoabrasão, Estrias. RESULTADOS E DISCUSSÃO: A microdermoabrasão remove as células envelhecidas e estimula a produção de células jovens e colágeno. A lesão provocada pela microgalvanopuntura leva a produção de diversas enzimas responsáveis pelo processo inflamatório, além de células como os fibroblastos, promovendo assim a regeneração tecidual e melhorando o aspecto da pele. CONCLUSÃO: O estudo mostrou que os procedimentos abordados obtiveram resultados positivos na melhora do estado do tecido estriado. Assim, há também a necessidade de novas pesquisas, pois a literatura consultada não deixa claro qual metodo é mais eficiente devido à pouca quantidade de publicação, especialmente focada nas duas técnicas apresentadas em conjunto. É um problema cada vez mais comum que afeta a autoestima da maioria das mulheres.
TOI 694b and TIC 220568520b: Two Low-mass Companions near the Hydrogen-burning Mass Limit Orbiting Sun-like Stars
Authors: Mireles Ismael , Shporer Avi , Grieves Nolan , Zhou George , Günther Maximilian N. , Brahm Rafael , Ziegler Carl , Stassun Keivan G. , Huang Chelsea X. , Nielsen Louise , dos Santos Leonardo A. , Udry Stéphane , Bouchy François , Ireland Michael , Wallace Alexander , Sarkis Paula , Henning Thomas , Jordán Andrés , Law Nicholas , Mann Andrew W. , Paredes Leonardo A. , James Hodari-Sadiki , Jao Wei-Chun , Henry Todd J. , Butler R. Paul , Rodriguez Joseph E. , Yu Liang , Flowers Erin , Ricker George R. , Latham David W. , Vanderspek Roland , Seager Sara , Winn Joshua N. , Jenkins Jon M. , Furesz Gabor , Hesse Katharine , Quintana Elisa V. , Rose Mark E. , Smith Jeffrey C. , Tenenbaum Peter , Vezie Michael , Yahalomi Daniel A. , Zhan Zhuchang
Published: August 2020

We report the discovery of TOI 694 b and TIC 220568520 b, two low-mass stellar companions in eccentric orbits around metal-rich Sun-like stars, first detected by the Transiting Exoplanet Survey Satellite (TESS). TOI 694 b has an orbital period of 48.05131 ± 0.00019 days and eccentricity of 0.51946 ± 0.00081, and we derive a mass of 89.0 ± 5.3

(0.0849 ± 0.0051

) and radius of 1.111 ± 0.017

(0.1142 ± 0.0017

). TIC 220568520 b has an orbital period of 18.55769 ± 0.00039 days and eccentricity of 0.0964 ± 0.0032, and we derive a mass of 107.2 ± 5.2

(0.1023 ± 0.0050

) and radius of 1.248 ± 0.018

(0.1282 ± 0.0019

). Both binary companions lie close to and above the hydrogen-burning mass threshold that separates brown dwarfs and the lowest-mass stars, with TOI 694 b being 2σ above the canonical mass threshold of 0.075

. The relatively long periods of the systems mean that the magnetic fields of the low-mass companions are not expected to inhibit convection and inflate the radius, which according to one leading theory is common in similar objects residing in short-period tidally synchronized binary systems. Indeed we do not find radius inflation for these two objects when compared to theoretical isochrones. These two new objects add to the short but growing list of low-mass stars with well-measured masses and radii, and highlight the potential of the TESS mission for detecting such rare objects orbiting bright stars.
Calibrating the Galactic Cepheid Period–Luminosity Relation from the Maximum-likelihood Technique
Authors: Lazovik Yaroslav A. , Rastorguev Alexey S.
Published: August 2020

We present a realization of the maximum-likelihood technique, which is one of the latest modifications of the Baade–Becker–Wesselink method. Our approach is based on nonlinear calibrations of the effective temperature and bolometric correction, which take into account metallicity and surface gravity. It allows one to estimate the key Cepheid parameters, the distance modulus, and the interstellar reddening, combining photometric and spectroscopic data (including the effective temperature data). This method is applied to a sample of 44 Galactic Cepheids for which multiphase temperature measurements are available. The additional data correction is performed to subtract the impact of the component in binary/multiple systems. We also study the effect of shock waves, whose presence in the stellar atmosphere distorts the observational data and leads to systematic errors in the obtained parameters. We determine the optimal restriction on the input data to eliminate this effect. This restriction provides accurate period–radius and period–luminosity relations that are consistent with the results in previous studies. We found the following relations: log R = (0.68 ± 0.03) · log P + (1.14 ± 0.03), M

v
 = − (2.67 ± 0.16) · (log P − 1) − (4.14 ± 0.05).
A VIPA Spectrograph with Ultra-high Resolution and Wavelength Calibration for Astronomical Applications
Authors: Zhu Xiaoming , Lin Dong , Hao Zhibo , Wang Liang , He Jinping
Published: August 2020

A prototype spectrograph using a Virtually Imaged Phased Array (VIPA) as the main dispersion element is presented, and its performance is fully examined in our laboratory. The single-mode, fiber-fed spectrograph with simultaneous wavelength calibration possesses a spectral resolution well in excess of

while the size of the VIPA is several orders of magnitude smaller than that of a conventional échelle with comparable resolution. In laboratory tests, the VIPA-based instrument with a homemade Yb:fiber ring laser frequency comb demonstrates a mode-to-mode tracking stability of 41 cm s−1 over a period of 6 hr. The VIPA spectrograph has promising applications in various astronomical observations in which ultra-high resolution and calibration precision are imperative, such as solar physics research, exoplanet searching with the radial velocity method, and O2 detection in the atmosphere of Earth-like planets. Ultimately, feasible optimizations for night-sky observations under seeing limited conditions are discussed.
Anisotropy of Long-period Comets Explained by Their Formation Process
Authors: Higuchi Arika
Published: August 2020

Long-period comets coming from the Oort cloud are thought to be planetesimals formed in the planetary region on the ecliptic plane. We have investigated the orbital evolution of these bodies due to the Galactic tide. We extended our previous work and derived analytical solutions to the Galactic longitude and latitude of the direction of aphelion, L and B. Using the analytical solutions, we show that the ratio of the periods of evolution of L and B is very close to either 2 or

for initial eccentricities e

i
 ≃ 1, as is true for the Oort cloud comets. From the relation between L and B, we predict that Oort cloud comets returning to the planetary region are concentrated on the ecliptic plane and a second plane, which we call the “empty ecliptic.” This consists in a rotation of the ecliptic around the Galactic pole by 180°. Our numerical integrations confirm that the radial component of the Galactic tide, which is neglected in the derivation of the analytical solutions, is not strong enough to break the relation between L and B derived analytically. Brief examination of observational data shows that there are concentrations near both the ecliptic and the empty ecliptic. We also show that the anomalies of the distribution of B of long-period comets mentioned by several authors are explained by the concentrations on the two planes more consistently than by previous explanations.
The Advanced Spectral Library (ASTRAL): Abundance Analysis of the Chemically Peculiar Star HR 465*
Authors: Nielsen Krister E. , Carpenter Kenneth G. , Kober Gladys V. , Wahlgren Glenn M.
Published: August 2020

This paper presents the results of the spectrum analysis of the B-type magnetic chemically peculiar star HR 465. HR 465 shows unusual abundance patterns that vary with a period of 21.5 yr. Our observations are recorded at ϕ = 0.45, 0.68, and 0.85 of the spectroscopic period, where ϕ = 0 represents the phase of maximum flux in the photometric y-band. Synthetic spectra, computed using an LTE atmosphere model, are fit to high-resolution ultraviolet Hubble Space Telescope (ϕ = 0.45) spectra obtained as part of the Advanced Spectral Library Project: Hot Stars program. The ultraviolet data are supplemented by high-resolution optical spectra (ϕ = 0.68 and 0.85) recorded at the Nordic Optical Telescope with the SOFIN spectrograph. The optical data are used as a complement to the high line-density ultraviolet spectrum to derive accurate abundances for elements without spectral lines in the ultraviolet and to improve the abundance phase coverage for many atoms/ions. This analysis presents abundance results for more than 70 atoms/ions and confirms parts of the abundance characteristics previously reported where elements with high mass numbers show significant abundance enhancements compared with solar values while some of the lighter elements show abundance deficiencies. In addition, our measured abundances are consistent with the periodic variability for chromium and rare-earth elements. Our results are compared with earlier investigations of this peculiar object to constrain stellar abundance and diffusion.
Local Starburst Conditions and Formation of GRB 980425/SN 1998bw within a Collisional Ring
Authors: Arabsalmani M. , Renaud F. , Roychowdhury S. , Arumugam V. , Floc’h E. Le , Bournaud F. , Cormier D. , Zwaan M. A. , Christensen L. , Pian E. , Madden S. , Levan A.
Published: August 2020

We present the first spatially resolved study of molecular gas in the vicinity of a gamma-ray burst (GRB), using CO(2−1) emission-line observations with the Atacama Large Millimetre Array at ∼50 pc scales. The host galaxy of GRB 980425 contains a ring of high column density H i gas, which is likely to have formed due to a collision between the GRB host and its companion galaxy, within which the GRB is located. We detect 11 molecular gas clumps in the galaxy, 7 of which are within the gas ring. The clump closest to the GRB position is at a projected separation of ∼280 pc. Although it is plausible that the GRB progenitor was ejected from clusters formed in this clump, we argue that the in situ formation of the GRB progenitor is the most likely scenario. We measure the molecular gas masses of the clumps and find them to be sufficient for forming massive star clusters. The molecular gas depletion times of the clumps show a variation of ∼2 dex, comparable with the large variation in depletion times found in starburst galaxies in the nearby universe. This demonstrates the presence of starburst modes of star formation on local scales in the galaxy, even while the galaxy as a whole cannot be categorized as a starburst based on its global properties. Our findings suggest that the progenitor of GRB 9802425 was originated in a young massive star cluster formed in the starburst mode of star formation.
Softening of the Metagalactic Ionizing Background from Internal He ii Absorption in Quasars
Authors: Shull J. Michael , Danforth Charles W.
Published: August 2020

Quasars and other active galactic nuclei (AGN) are significant contributors to the metagalactic ionizing background at redshifts z < 3. Recent Hubble Space Telescope (HST)/Cosmic Origins Spectrograph (COS) composite spectra of AGN find a harder flux distribution in the Lyman continuum,

(α

s
 = 1.41 ± 0.15), compared to previous studies. This index appears to be inconsistent with observed He ii/H i absorption ratios (η) in the Lyα forest. We explore the effects of internal AGN absorption in the He ii (4 ryd) continuum using an analytic source-function model of the ionizing background in which the emissivity (j

ν
) arises from quasars, reprocessed by the opacity (κ

ν
) of the intervening Lyα forest and distinct AGN escape fractions

and

at 1 ryd and 4 ryd, respectively. We also examine H i and He ii photoelectric heating from the reprocessed background, whose spectral index (α

b
 > α

s
) depends on α

s
, the H i column density slope β, and the ratio

. We compare the model to Lyα absorption lines of He ii and H i toward the quasar HE 2347−4342. Internal AGN absorption with

but

would increase the index by Δα

b
 ≈ 0.3–1.0, corresponding to η = 60–200 for β ≈ 1.5–1.6, in agreement with HST/COS observations at z ≈ 2.5–2.9. The observed range of ratios, η < 200, constrains α

b
 < 3.4 and

. Individual AGN with softer spectra, α

s
 > 1.7, and more internal He ii absorption could produce a few absorbers with η > 300, in proximity to AGN transverse to the sight line.
Multiwavelength Photometry and Progenitor Analysis of the Nova V906 Car
Authors: Wee Jerrick , Blagorodnova Nadejda , Penprase Bryan Edward , Facey Jett Pierce , Morioka Taiga , Corbett Hank , Barlow Brad N. , Kupfer Thomas , Law Nicholas M. , Ratzloff Jeffrey K. , Howard Ward S. , Chavez Ramses Gonzalez , Glazier Amy , Soto Alan Vasquez , Horiuchi Takashi
Published: August 2020

We present optical and infrared photometry of the classical nova V906 Car, also known as Nova Car 2018 and ASASSN-18fv, which was discovered by the All-Sky Automated Survey for SuperNovae (ASAS-SN) on 2018 March 16.32 UT (MJD 58193.0). The nova reached its maximum on MJD 58222.56 at V
max = 5.84 ± 0.09 mag, and had decline times of

days and

days. The data from Evryscope shows that the nova had already brightened to

mag five days before discovery, as compared with its quiescent magnitude of g = 20.13 ± 0.03. The extinction toward the nova, as derived from high-resolution spectroscopy, shows an estimate consistent with foreground extinction to the Carina Nebula of

. The light curve resembles a rare C (cusp) class nova with a steep decline slope of α = −3.94 post-cusp flare. From the light-curve decline rate, we estimate the mass of the white dwarf to be M
WD = <0.8M
⊙, consistent with

derived from modeling the accretion disk of the system in quiescence. The donor star is likely a K-M dwarf of 0.23–0.43

, which is heated by its companion.
Dual Supermassive Black Holes at Close Separation Revealed by the Hyper Suprime-Cam Subaru Strategic Program
Authors: Silverman John D. , Tang Shenli , Lee Khee-Gan , Hartwig Tilman , Goulding Andy , Strauss Michael A. , Schramm Malte , Ding Xuheng , Riffel Rogemar A. , Fujimoto Seiji , Hikage Chiaki , Imanishi Masatoshi , Iwasawa Kazushi , Jahnke Knud , Kayo Issha , Kashikawa Nobunari , Kawaguchi Toshihiro , Kohno Kotaro , Luo Wentao , Matsuoka Yoshiki , Matsuda Yuichi , Nagao Tohru , Oguri Masamune , Ono Yoshiaki , Onoue Masafusa , Ouchi Masami , Shimasaku Kazuhiro , Suh Hyewon , Suzuki Nao , Taniguchi Yoshiaki , Toba Yoshiki , Ueda Yoshihiro , Yasuda Naoki
Published: August 2020

The unique combination of superb spatial resolution, wide-area coverage, and deep depth of the optical imaging from the Hyper Suprime-Cam (HSC) Subaru Strategic Program is utilized to search for dual quasar candidates. Using an automated image analysis routine on 34,476 known Sloan Digital Sky Survey quasars, we identify those with two (or more) distinct optical point sources in HSC images covering 796 deg2. We find 421 candidates out to a redshift of 4.5 of which one hundred or so are more likely after filtering out contaminating stars. Angular separations of 0.″6–4.″0 correspond to projected separations of 3–30 kpc, a range relatively unexplored for population studies of luminous dual quasars. Using Keck I/Low Resolution Imaging Spectrometer and Gemini-N/Near-Infrared Integral Field Spectrometer, we spectroscopically confirm three dual quasar systems at z < 1, two of which are previously unknown out of eight observed, based on the presence of characteristic broad emission lines in each component, while highlighting that the continuum of one object in one of the pairs is reddened. In all cases, the [O iii]λ5007 emission lines have mild velocity offsets, thus the joint [O iii] line profile is not double-peaked. We find a dual quasar fraction of 0.26 ± 0.18% and no evidence for evolution. A comparison with the Horizon-AGN simulation seems to support the case of no evolution in the dual quasar fraction when broadly matching the quasar selection. These results may indicate a scenario in which the frequency of the simultaneous triggering of luminous quasars is not as sensitive as expected to the cosmic evolution of the merger rate or gas content of galaxies.
A Distant Fast Radio Burst Associated with Its Host Galaxy by the Very Large Array
Authors: Law Casey J. , Butler Bryan J. , Prochaska J. Xavier , Zackay Barak , Burke-Spolaor Sarah , Mannings Alexandra , Tejos Nicolas , Josephy Alexander , Andersen Bridget , Chawla Pragya , Heintz Kasper E. , Aggarwal Kshitij , Bower Geoffrey C. , Demorest Paul B. , Kilpatrick Charles D. , W. Lazio T. Joseph , Linford Justin , Mckinven Ryan , Tendulkar Shriharsh , Simha Sunil
Published: August 2020

We present the discovery and subarcsecond localization of a new fast radio burst (FRB) by the Karl G. Jansky Very Large Array (VLA) and realfast search system. The FRB was discovered on 2019 June 14 with a dispersion measure of 959

. This is the highest DM of any localized FRB and its measured burst fluence of 0.6 Jy ms is less than nearly all other FRBs. The source is not detected to repeat in 15 hr of VLA observing and 153 hr of CHIME/FRB observing. We describe a suite of statistical and data quality tests we used to verify the significance of the event and its localization precision. Follow-up optical/infrared photometry with Keck and Gemini associate the FRB with a pair of galaxies with

mag. The false-alarm rate for radio transients of this significance that are associated with a host galaxy is roughly

. The two putative host galaxies have similar photometric redshifts of

, but different colors and stellar masses. Comparing the host distance to that implied by the dispersion measure suggests a modest (

) electron column density associated with the FRB environment or host galaxy/galaxies.
The Turbulent Gas Structure in the Centers of NGC 253 and the Milky Way
Authors: Krieger Nico , Bolatto Alberto D. , Koch Eric W. , Leroy Adam K. , Rosolowsky Erik , Walter Fabian , Weiß Axel , Eden David J. , Levy Rebecca C. , Meier David S. , Mills Elisabeth A. C. , Moore Toby , Ott Jürgen , Su Yang , Veilleux Sylvain
Published: August 2020

We compare molecular gas properties in the starbursting center of NGC 253 and the Milky Way Galactic center (GC) on scales of ∼1–100 pc using dendrograms and resolution-, area-, and noise-matched data sets in CO (1–0) and CO (3–2). We find that the size–line width relations in NGC 253 and the GC have similar slope, but NGC 253 has larger line widths by factors of ∼2–3. The σ
2/R dependency on column density shows that, in the GC, on scales of 10–100 pc the kinematics of gas over N > 3 × 1021 cm−2 are compatible with gravitationally bound structures. In NGC 253 this is only the case for column densities N > 3 × 1022 cm−2. The increased line widths in NGC 253 originate in the lower column density gas. This high velocity dispersion, not gravitationally self-bound gas, is likely in transient structures created by the combination of high average densities and feedback in the starburst. The high densities turn the gas molecular throughout the volume of the starburst, and the injection of energy and momentum by feedback significantly increases the velocity dispersion at a given spatial scale over what is observed in the GC.
Nanoflare Diagnostics from Magnetohydrodynamic Heating Profiles
Authors: Knizhnik K. J. , Barnes W. T. , Reep J. W. , Uritsky V. M.
Published: August 2020

The nanoflare paradigm of coronal heating has proven extremely promising for explaining the presence of hot, multi-million degree loops in the solar corona. In this paradigm, localized heating events supply enough energy to heat the solar atmosphere to its observed temperatures. Rigorously modeling this process, however, has proven difficult because it requires an accurate treatment of both the magnetic field dynamics and reconnection as well as the plasma response to magnetic perturbations. In this paper, we combine fully 3D magnetohydrodynamic (MHD) simulations of coronal active region plasma driven by photospheric motions with spatially averaged, time-dependent hydrodynamic (HD) modeling of coronal loops to obtain physically motivated observables that can be quantitatively compared with observational measurements of active region cores. We take the behavior of reconnected field lines from the MHD simulation and use them to populate the HD model to obtain the thermodynamic evolution of the plasma and subsequently the emission measure distribution. We find that the photospheric driving of the MHD model produces only very low-frequency nanoflare heating that cannot account for the full range of active region core observations as measured by the low-temperature emission measure slope. Additionally, we calculate the spatial and temporal distributions of field lines exhibiting collective behavior, and argue that loops occur due to random energization occurring on clusters of adjacent field lines.
Identifying and Tracking Solar Magnetic Flux Elements with Deep Learning
Authors: Jiang Haodi , Wang Jiasheng , Liu Chang , Jing Ju , Liu Hao , Wang Jason T. L. , Wang Haimin
Published: August 2020

Deep learning has drawn significant interest in recent years due to its effectiveness in processing big and complex observational data gathered from diverse instruments. Here we propose a new deep learning method, called SolarUnet, to identify and track solar magnetic flux elements or features in observed vector magnetograms based on the Southwest Automatic Magnetic Identification Suite (SWAMIS). Our method consists of a data preprocessing component that prepares training data from the SWAMIS tool, a deep learning model implemented as a U-shaped convolutional neural network for fast and accurate image segmentation, and a postprocessing component that prepares tracking results. SolarUnet is applied to data from the 1.6 m Goode Solar Telescope at the Big Bear Solar Observatory. When compared to the widely used SWAMIS tool, SolarUnet is faster while agreeing mostly with SWAMIS on feature size and flux distributions and complementing SWAMIS in tracking long-lifetime features. Thus, the proposed physics-guided deep learning-based tool can be considered as an alternative method for solar magnetic tracking.
The Variable Mg ii Narrow Absorption Line Systems
Authors: Chen Zhi-Fu , Qin Huan-Chang , Gui Run-Jin , Yi Shuang-Xi , Chen Zhe-Geng , Gao Yan-Chun , Pang Ting-Ting , Mo Xiao-Hua
Published: August 2020

Compared to high ionization C iv absorption lines, variable Mg ii absorption lines are rare. Using spectra from the Sloan Digital Sky Survey, we investigate the variations in Mg ii narrow absorption lines (NALs) for quasars with multi-epoch observations. We have compiled 8958 Mg ii NALs in the spectral regions from the red wings of C iv emission lines to the red wings of Mg ii emission lines. Among these 8958 Mg ii NALs, 22 variable NALs are detected with

and with velocity offsets ranging from

to 145,513

. We find that: (1) the detected frequency of Mg ii NALs with

is significantly larger than the uniformly random value expected for the Mg ii NALs with

, (2) the incidence rates of the variable Mg ii NALs with

are much larger than those with

, (3) the velocity offsets of variable Mg ii NALs with

are much smaller than the maximum velocities expected from radiation-driven outflows, and (4) the variations of variable Mg ii NALs with

are obviously correlated with the changes in the quasar radiative output. Therefore, the 16 variable Mg ii NALs, whose velocities are smaller than the maximum velocities expected from radiation-driven outflows, are likely related to quasar outflows, while the 6 variable Mg ii NALs, whose velocities are much larger than the maximum velocities expected from radiation-driven outflows, possibly originated in intervening gas. We also find that both the variations and fractional variations in absorption strengths are not related to the velocity offsets of Mg ii NALs and the time intervals between the two epochs of observations. Also, the fractional variations in absorption strengths are inversely correlated with absorption strengths. In addition, both the associated and intervening Mg ii NALs can significantly vary on a timescale of days.
Flight Calibration of the Van Allen Probe Magnetometers
Authors: Vasquez Bernard J. , Smith Charles W. , Paulson Kristoff W. , Kletzing C. A.
Published: August 2020

The twin Van Allen Probes each carry a triaxial fluxgate magnetometer. Their orbits transverse a large of range of magnetic intensity. A procedure is described that calibrates the magnetometer in the spinning-spacecraft frame and in the presence of a persistent gradient of the magnetic field. This is done by extending a model based on a constant background magnetic field to a model with a changing magnetic field during intervals used for calibration. Model parameters derived from short intervals are obtained by direct calculation, and uncertainties are propagated throughout the analysis. A daily ensemble analysis of interval-derived parameters and uncertainties is then made to correct for sensor bias and misalignment. The whole analysis is iterated to convergence in a few steps based on the estimated uncertainties associated with the model parameters.
Magnetosheath Jets and Plasmoids: Characteristics and Formation Mechanisms from Hybrid Simulations
Authors: Preisser Luis , Blanco-Cano Xóchitl , Kajdič Primoz , Burgess David , Trotta Domenico
Published: August 2020

Magnetosheath jets and plasmoids are very common phenomena downstream of Earth’s quasi-parallel bow shock. As the increase of the dynamic pressure is one of the principal characteristics of magnetosheath jets, the embedded paramagnetic plasmoids have been considered as an special case of the former. Although the properties of both types of structures have been widely studied during the last 20 years, their formation mechanisms have not been examined thoroughly. In this work we perform a 2D local hybrid simulation (kinetic ions – fluid electrons) of a quasi-parallel (θ

Bn
= 15°), supercritical (M

A
= 7) collisionless shock in order to study these mechanisms. Specifically, we analyze the formation of one jet and one plasmoid, showing for the first time that they can be produced by different mechanisms related to the same shock. In our simulation, the magnetosheath jet is formed according to the mechanism proposed by Hietala, where at the shock ripples the upstream solar wind suffers locally less deceleration and the flow is focused in the downstream side, producing a compressed and high-velocity region that leads to an increase of dynamic pressure downstream of the shock. The formation of the plasmoid, however, follows a completely new scenario being generated by magnetic reconnection between two plasma layers with opposite B-field orientation in the region just behind the shock.
Petrocodon luteoflorus (Gesneriaceae), a new species from karst region in Guizhou, China
Authors: Fan Zhi-Wei , Cai Lei , Yang Jia-Wen , Tang Sheng-Hu , Wen Fang
Published: August 2020

A new species of Gesneriaceae, Petrocodon luteoflorus Lei Cai & F.Wen was first described and illustrated from Maolan National Nature Reserve, Libo County, Guizhou Province, China. The diagnostic characters and notes of this species between its most morphologically similar species, P. dealbatus Hance, a detailed description, colour photographs, etymology, as well as distribution and habitat, are also provided in this paper.
The taxonomic identity of Didymostigma trichanthera (Gesneriaceae)
Authors: Yang Lihua , Feng Chen , Kang Ming , Wen Fang
Published: August 2020

Based on consulting original literature, the examination of specimens, and field investigations, Didymostigma trichanthera is shown to be conspecific with Henckelia anachoreta. Therefore, Didymostigma trichanthera is formally treated as a synonym of Henckelia anachoreta here.
Two new combinations in Oreocharis (Gesneriaceae) based on morphological, molecular and cytological evidence
Authors: Yang Li-Hua , Wen Fang , Kong Hang-Hui , Sun Zhi-Xia , Su Lan-Ying , Kang Ming
Published: August 2020

The newly-circumscribed genus Oreocharis is recently enlarged by incorporating ten other genera with high floral diversity. In this study, our morphological, molecular and cytological evidence supports our adding two species from other two different genera (Boeica and Beccarinda) to Oreocharis. The special corolla shape (campanulate or flat-faced) and related short filament of these two new combinations, Oreocharis guileana and O. baolianis, further enrich the diversity of floral characters of the enlarged Oreocharis. Meanwhile, some supplementary and amended descriptions of these two species are made here. Our morphological, molecular and geographical data indicate that O. guileana is related to O. pilosopetiolata to a certain extent. For O. baolianis, however, our current dataset does not allow conclusions on the species relationship within Oreocharis.
Biogeography and evolution of Asian Gesneriaceae based on updated taxonomy
Authors: Tan Ke , Lu Tao , Ren Ming-Xun
Published: August 2020

Based on an updated taxonomy of Gesneriaceae, the biogeography and evolution of the Asian Gesneriaceae are outlined and discussed. Most of the Asian Gesneriaceae belongs to Didymocarpoideae, except Titanotrichum was recently moved into Gesnerioideae. Most basal taxa of the Asian Gesneriaceae are found in the Indian subcontinent and Indo-China Peninsula, suggesting Didymocarpoideae might originate in these regions. Four species diversification centers were recognized, i.e. Sino-Vietnam regions, Malay Peninsula, North Borneo and Northwest Yunnan (Hengduan Mountains). The first three regions are dominated by limestone landscapes, while the Northwest Yunnan is well-known for its numerous deep gorges and high mountains. The places with at least 25% species are neoendemics (newly evolved and narrowly endemic) which were determined as evolutionary hotspots, including Hengduan Mountains, boundary areas of Yunnan-Guizhou-Guangxi in Southwest China, North Borneo, Pahang and Terengganu in Malay Peninsula, and mountainous areas in North Thailand, North Sulawesi Island. Finally, the underlying mechanisms for biogeographical patterns and species diversification of the Asian Gesneriaceae are discussed.
Two new taxa of Gesneriaceae in the karst regions in North Vietnam
Authors: Chen Wen-Hong , Guo Shi-Wei , Nguyen Hieu Quang , Chen Li , Shui Yu-Min
Published: August 2020

One new species and one new variety of Gesneriaceae in Vietnam are described, viz. Paraboea sinensis var. glabrissimavar. nov. and Primulina xuansonensissp. nov. These two new taxa grow in limestone regions in North Vietnam. The former new variety differs from Paraboea sinensis (Oliv.) Burtt var. sinensis in its young leaf abaxially, stem and peduncle sparsely and thin pannose, acute top of leaves, pistil glandular-pubescent or pubescent. The latter new species differs in its bracts 1.6–2.5 × 1.3–1.5 cm, corolla 3–3.5 cm long, corolla tube slightly curved near the base and inflated on the adaxial surface near the corolla lobes, and corolla abaxial lip lobes rounded. The two new taxa grow at Xuan Son National Natural Reserve, North Vietnam and remain undisturbed with low risk of extinction.
Gesneriaceae in China and Vietnam: Perfection of taxonomy based on comprehensive morphological and molecular evidence
Authors: Chen Wen-Hong , Wen Fang , Ren Ming-Xun , Yang Lihua , Hong Xin , Qiu Zhi-Jing , Shui Yu-Min
Published: August 2020

No
Effect of Aggression Management Training on Perceived Stress Levels of Nurses Working in Mental Health Care Settings in Jordan
Authors: Masa'Deh Rami , Masadeh Omayma , Jarrah Samiha , AlAzzam Manar , Alhalaiqa Fadwa
Published: August 2020

The current study investigated the effect of an aggression management training course on reducing perceived stress levels of nurses working in mental health care settings in Jordan. This quasi-experimental pre/post study included 83 nurses (44 male, 39 female; mean age = 33 years) who completed a sociodemographic characteristics questionnaire and the Arabic Version of the Perceived Stress Scale 10-Items Questionnaire. Participants attended 32 hours of an aggression management training course and then answered the questionnaires for a second time. Female nurses reported significantly higher stress levels than male nurses before and after the training course. Paired-samplesttest showed a significant decrease in the mean total score of perceived stress of all nurses after attending the training course. The results of this study highlight the need to design and implement aggression management courses, as such training can improve nurses' mental health and perceived stress levels. [Journal of Psychosocial Nursing and Mental Health Services, 58(10), 32–38.]
Solid phase extraction of β-sitosterol and α-tocopherol from sunflower oil deodorizer distillate using desilicated zeolite
Authors: Karaoglu O. , Alpdogan G. , Ozdemir I. S. , Ertas E.
Published: August 2020

In this study, the efficiency of using zeolite-based adsorbents in a solid phase extraction (SPE) procedure of α-tocopherol and β-sitosterol isolation from Sunflower Oil Deodorizer Distillate (SuDOD) with­out pre-treatment was investigated. The results showed that 99.2% α-tocopherol and 97.3% β-sitosterol were suc­cessfully isolated as pure fractions from SuDOD, when desilicated ZSM-5-type zeolite (DSiZSM-5) was used as adsorbent on a SPE. A simple and rapid HPLC method for simultaneous α-tocopherol and β-sitosterol analysis was developed and validated according to AOAC guidelines. It was found that the inclusion of a DSiZSM-5 SPE step increased the precision of the α-tocopherol and β-sitosterol analysis. In conclusion, DSiZSM-5 zeo­lite was proven to be an efficient adsorbent which can be used not only for the recovery of α-tocopherol and β-sitosterol from SuDOD in industrial scale, but also in a laboratory scale clean-up method prior to the analysis of α-tocopherol and β-sitosterol.
A Current Review of Human Factors and Ergonomic Intervention With Exoskeletons
Authors: Schnieders Thomas M. , Stone Richard T.
Published: August 2020

Research and development of exoskeletons began as early as the 1960s. Recent advancement in technology has spurred a further research into the field specifically at rehabilitation and human performance augmentation. Human performance augmenting exoskeletons find use in the military, emergency services, industrial and space applications, and training. Rehabilitation exoskeletons assist in posture support and replacing lost function. Exoskeleton research is broadly broken up in this chapter by anthropometry: lower body, upper body, and extremities. The development for various anthropometry has their own unique set of challenges. This chapter provides a brief history, discusses current trends in research, looks at some of the technology involved in development, the potential benefits of using exoskeletons, and looks at the possible future improvements in research.
A Primer for Beginners in Pharmaceutical Care
Authors: Dias-Souza Marcus Vinícius
Published: August 2020

This article describes how pharmacists are highly accessible healthcare professionals, and their clinical services are among the most accessible healthcare assistance systems worldwide considering the availability, geographic distribution and location of compounding pharmacies, clinical laboratories and drugstores. Pharmacists need to move from the focus in administrative management to patient-oriented practice, such that the access and the quality of clinical services can be improved. Pharmaceutical Care can influence pharmaceutical services to become more accessible and with a broader coverage of patients. Here is presented an approach on the implementation of effective strategies to improve the quality of Pharmacists' performance as specialized healthcare providers.
Multicultural Considerations in Play Therapy Caregiver Consultation
Authors: Brumfield Kristy A. , Owens Celita J. , Steen Rheta LeAnne , Floer Renee M.
Published: August 2020

The purpose of this chapter is to review the literature regarding parent consultation and to address special considerations when working across cultures and ethnicities. Understanding privacy expectations and how to meet the needs of families, without discouraging the caregivers or unintentionally breaking cultural guidelines, will be explored. This chapter is extremely important because mental health professionals must adhere to the diversity guidelines and ethical standards of practice in complex cases, with many involved caregivers at times. When consulting with caregivers from culturally diverse backgrounds, consultants need to consider the impact of culture on the caregiver, the child client, and on the consultation process.
Yogic Care for Neurodevelopmental Rehabilitation
Authors: Singh Arun Pratap
Published: August 2020

Recent biological and behavioral studies indicate that several unhealthy alterations in ways of living (i.e., consumption-pattern, leisure activities, sleep routine, postures, breathing, stress-level, and use of high-tech gadgets) may be related with aggravation and augmentation of neurodevelopmental disorders. In this backdrop, it is important to recognize that yoga offers holistic knowledge for correction in lifestyle to not only prevent but also manage and alleviate neurodevelopmental disorders. Unfortunately, clinicians have been relying in their practice rather heavily on intrusive and pharmacological interventions and avoiding the use of sustainable techniques. Therefore, in order to increase awareness and promote its use in clinical settings, present work is ventured on the understanding effectiveness of and challenges in utilizing yogic practices for neurodevelopmental rehabilitation. It also identifies priorities for future research and action to amplify applicability of yogic lifestyle in hospitals, clinics, and other public health centers.