bluuebunny/crossref_metadata_2025 huggingface dataset:
Peran Kepuasan dalam Memediasi Pengaruh Persepsi Nilai Pasca Pembelian Terhadap Minat Beli Ulang Pengguna Vending Machine Blue Mart
Authors: Umara Bayu , Suryadi Dudy , Isnaeni Septi , Yulianti Gita , Tumini Yulia
Published: February 2021

Setiap perusahaan berupaya untuk dapat menjaring konsumen yang diawali dengan menumbuhkan minat beli. Berbagai cara dilakukan, salah satunya yang dilakukan oleh Blue Mart, yaitu dengan menyediakan mesin penjual otomatis atau vending maching. Konsumen diharapkan akan memiliki persepsi nilai yang baik berdasar pengalaman atau informasi pihak lain yang pernah melakukan pembelian melalui vending maching. Penelitian ini bertujuan untuk menganalisis pengaruh persepsi nilai terhadap minat beli ulang secara langsung dan tidak langsung melalui kepuasn konsumen. Penelitian dilakukan dengan menyebarkan kuesioner melalui google form selama bulan November 2020 kepada konsumen Vending Machine Blue Mart. Kuesioner yang terkumpul dan memenuhi kriteria sebagai data penelitian sebanyak 186. Structural Equation Modelling menggunakan AMOS Versi 23 digunakan untuk menganalisis data. Temuan penelitian menunjukkan bahwa persepsi nilai pasca pembelian mempengaruhi minat beli ulang konsumen Blue Mart menggunakan vending machine secara langsung atau tidak langsung yang dimediasi oleh kepuasan konsumen.
Determinan Pembiayaan Bagi Hasil Pada Perbankan Syariah
Authors: Primadhita Yuridistya , Primatami Anggraita , Budiningsih Susilowati
Published: February 2021

Pembiayaan bagi hasil bank syariah terbagi dalam bentuk pembiayaan mudharabah dan musyarakah yang didasarkan pada skema profit sharing atau revenue sharing. Skema ini sangat berbeda dengan kredit pada bank konvensional yang berbasis bunga. Tujuan penelitian adalah untuk menganalisis pengaruh dana pihak ketiga (DPK), financing to deposit ratio (FDR), dan non performing financing (NPF) terhadap pembiayaan bagi hasil perbankan syariah di Indonesia. Penelitian terdiri atas 37 observasi meliputi periode September 2017 sampai dengan September 2020. Data dianalisis dengan metode regresi linier berganda. Penelitian menghasilkan temuan DPK dan FDR berpengaruh positif terhadap pembiayaan bagi hasil, sementara NPF berpengaruh negatif terhadap pembiayaan bagi hasil. Semakin rendah risiko bank, semakin tinggi pengumpulan dana nasabah, dan semakin besar rasio penyaluran pembiayaan berpengaruh terhadap peningkatan penyaluran pembiayaan berbasis bagi hasil pada perbankan syariah di Indonesia.

Abstract

Profit-sharing financing in Islamic banks is divided into mudharabah and musyarakah financing which is based on a profit-sharing or revenue sharing scheme. This scheme is very different from interest-based credit at conventional banks. This study aims to analyze the impact of third party funds (DPK), financing to deposit ratio (FDR), and non-performing financing (NPF) on the profit-sharing financing of Islamic banking in Indonesia. The study consisted of 37 observations covering the period September 2017 to September 2020. Data were analyzed using multiple linear regression methods. The results of the study showed that TPF and FDR had a positive effect on profit-sharing financing, while NPF had a negative effect on profit-sharing financing. The lower bank risk, the higher collection of customer funds, and the higher financing distribution ratio have an effect on increasing the distribution of profit sharing based financing in Islamic banking in Indonesia.
Turnover Intentions: Pengaruh Kepuasan Kerja, Komitmen Organisasional dan Stres Kerja
Authors: Ardianto Riski , Bukhori Muhamad
Published: February 2021

Penelitian ini bertujuan untuk menganalisis pengaruh variable kepuasan kerja, komitmen organisasional dan stress kerja terhadap turnover intentions di PT. Taruma Mandiri Indonesia. Reponden penelitian berjumlah 59 responden yang merupakan seluruh pegawai PT Taruma Mandiri Indonesia. Analisis data dengan regresi linier ganda. Kepuasan kerja dan stres kerja berpengaruh positif sedangkan  komitmen organisasional  tidak berpengaruh terhadap turnover intentions.

 Abstract

This research aims to analyze the influence of job satisfaction variables, organizational commitment and job stress on turnover intentions at PT. Taruma Mandiri Indonesia. Research respondents totaled 59 respondents who were all employees of PT Taruma Mandiri Indonesia. Data analysis using multiple linear regression. Job satisfaction and job stress have a positive effect, while organizational commitment has no effect on turnover intentions
Pengaruh Pelatihan dan Berbagi Pengetahuan Terhadap Kinerja Karyawan Melalui Pengetahuan Manajemen
Authors: Oktavian Ade , Prasetia Aditya , Masnun Masnun , Widoro Widoro
Published: February 2021

Penelitian bertujuan mengukur  pengaruh pelatihan dan berbagi pengetahuan terhadap kinerja karyawan melalui pengetahuan manajemen. Sampling jenuh digunakan pada penentuan sampel. Data diambil dari kuesioner yang dibagikan kepada karyawan Bank Maybank Indonesia Area Lippo Cikarang yang berjumlah 100 orang sebagai responden. Analisis jalur digunakan sebagai alat analisis diolah menggunakan software SPSS. Hasil penelitian menunjukkan pelatihan berpengaruh langsung dan tidak langsung terhadap kinerja melalui pengetahuan manajemen. Penelitian juga menemukan bahwa berbagi pengetahuan tidak berpengaruh langsung terhadap kinerja melainkan dimediasi oleh pengetahuan manajemen.

This study aims to measure the effect of training and knowledge sharing on employee performance through knowledge management. The sampling technique used was saturated sampling by distributing questionnaires to 100 employees of the Bank Maybank Indonesia Lippo Cikarang Area as respondents. This study uses path analysis as an analytical tool that is processed using SPSS software. The results showed that training had a direct effect on performance and indirectly through knowledge management. Research also found that knowledge sharing does not have a direct effect on performance but is mediated by knowledge management.
Pengaruh Tipe Post, Waktu Post, Testimoni Dan Follower Instagram Terhadap Minat Beli Konsumen
Authors: Eka Chandra , Fatahillah Reza , Sarsono Ari , Hanavi Alif , Sitorus Pandi
Published: February 2021

Perkembangan tehnologi saat ini telah diiringi dengan cepatnya jaringan internet, sehingga membuat para pelaku usaha lebih dipermudah dalam melakukan pemasaran di sosial media melalui smartphone secara langsung. Hal ini yang mendorong penelitian untuk mengkaji dan mengukur seberapa efektifitas minat beli konsumen di sebuah sosial media. Penelitian ini menggunakan sosial media Instagram untuk mengidentifikasikan minat beli yang dialami konsumen pada akun Instagram @minyakzaitunasli. Untuk mengetahui faktor apa saja yang dapat mempengaruhi minat beli pada suatu postingan produk maka pada penelitian ini akan mengungkapkan hasil atas pengujian antara tipe post, waktu post, followers dan testimoni pada suatu postingan produk dan jumlah pengikut di Instagram. Penelitian ini menggunakan metode kuantitaf dengan analisis regresi linear ganda. dengan mengambil sampling 51 responden dalam pengisian kuisioner yang dibagikan kepada follower account@minyakzaitunasli. Penelitian menunjukkan bahwa tipe post dan followers tidak mempengaruhi minat beli konsumen. Waktu post dan testimoni berpengaruh terhadap minat beli konsumen.

The current development of technology has been accompanied by a fast internet network, thus making it easier for business actors to do marketing on social media via smartphones directly. This has prompted research to study and measure the effectiveness of consumer buying interest in social media. This study uses Instagram social media to identify the buying interest experienced by consumers on the Instagram account @minyakzaitunasli. To find out what factors can affect buying interest in a product post, this study will reveal the results of testing between post types, post time and testimonials on product posts and the number of followers on Instagram. Research shows that the type of post and followers do not influence consumer purchase interest. Post time and testimonials affect consumer purchase interest
Pengaruh Gaya Kepemimpinan dan Lingkungan Kerja Terhadap Semangat Kerja Pegawai
Authors: Rismawati Rismawati , Syafira Diana
Published: February 2021

Penelitian ini bertujuan mengetahui pengaruh gaya kepemimpinan dan lingkungan kerja terhadap semangat kerja pegawai kecamatan cabangbungin kabupaten bekasi. Sampel penelitian adalah seluruh pegawai baik PNS maupun Non PNS di Kecamatan Cabangbungin Kabupaten Bekasi yang berjumlah 30 orang,. Metode analisis yang digunakan dalam penelitian ini adalah regresi linear berganda menggunakan program SPSS versi 22. Hasil penelitian menunjukkan bahwa ada pengaruh positif gaya kepemimpinan terhadap semangat kerja; ada pengaruh yang positif lingkungan kerja terhadap semangat kerja.

This study aims to determine the effect of leadership style and work environment on employee morale of the Bungin sub-district, Bekasi district. The research sample was all employees both PNS and Non-PNS in Cabangbungin District, Bekasi Regency, amounting to 30 people. The analytical method used in this research is multiple linear regression using the SPSS version 22 program. The results show that there is a positive effect of leadership style on morale; there is a positive influence of work environment on morale.
Hyperuricemia and Cardiovascular Implications
Authors: Patel Kaivan , Blackard Michael F. , Pandya Divya A. , Srivastava Puja , Gupta Manish , Pandya Abhijit S.
Published: February 2021

Gout is a painful disease that leads to inflammation and joint damage brought on by monosodium urate formation and deposition in joints. Multiple comorbidities are associated with gout, including and not limited to obesity, diabetes, hyperlipidemia, hypertension, vascular diseases and many other cardiovascular diseases. When the symptoms of gout are ignored or appropriate treatment is not prescribed, patients can develop a severe, chronic form of gout called tophaceous gout.
Cytokine Storm in the Novel Coronavirus Infection and Methods of its Correction
Authors: Ershov A. V. , Surova V. D. , Dolgikh V. T. , Dolgikh T. I.
Published: February 2021

The aim of the studywas to identify the role of cytokine storm in COVID-19, that emerged at the end of 2019, based on the analysis of 80 publications, including 17.4% Russian and 82.6% foreign publications for 2014–2020 with an average impact factor of 11.94 and a maximum of 74.699. This review includes an in-depth discussion of the possible causes and pathogenetic factors of cytokine storm syndrome development caused by COVID-19. The results of research on the use of various principles of cytokine storm correction are provided. It has been established that lung damage and the development of a fatal outcome are caused not by the virus itself, but by the hyperreaction of the body's immune system. The leading role in this process belongs to the cytokine storm, including the action of IL-6.
«Entre la realidad y la ficción. El ornato femenino en la literatura castellana bajomedieval y renacentista»
Authors: Hamer Flores Adolfo , Criado Vega Teresa María
Published: February 2021

El presente trabajo analiza las técnicas de elaboración de cosméticos contenidos en obras de literatura castellana de fines del medievo y primeros momentos del Renacimiento, comparándolas con la realidad recogida en recetarios castellanos coetáneos. En dichas obras aparecen un número importante de recetas que muestran el fin de los afeites, los ingredientes usados en su elaboración y, en menor medida, el proceso o procesos seguidos en su ejecución. Todo ello pone de relieve una faceta poco estudiada de la vida cotidiana del medievo y primeros años del Renacimiento, relacionada con la estética y la belleza y con el cuidado del cuerpo.
«La tradición medieval en la escena contemporánea espola. Dimonis de comediants»
Authors: Sánchez Montes María José
Published: February 2021

En más de una ocasión se ha señalado la ausencia de tradición dramática medieval, que además se ha extrapolado a la carencia total de tradición escénica en el contexto occidental. Sin embargo, es incontestable que existió una tradición teatral durante la Edad Media, que incluso mantiene ciertos vestigios en el teatro contemporáneo. A través de este artículo se pretende reconstruir un vínculo, en concreto el del demonio medieval, con un espectáculo emblemático para la tradición escénica contemporánea española, Dimonis de Comediants, que espero contribuya a la mejor comprensión del espectáculo en su propio contexto y a la recuperación de esa tradición a veces pensada como inexistente.
«Cabayong tabla: estudi i traducció d'un romanç filipí del regne de València (II)»
Authors: Donoso Isaac
Published: February 2021

Introducció a la conformació del romacer de tradició hispànica a les illes Filipines i la presència del Regne de València com espai literari en una literatura asiàtica. Al treball acompanya la descripció i traducció directa des del bicolà al valencià d’un dels principals romanços filipins que tracten del Regne de Valencia: Cabayong Tabla. Buhay ni Principe don Juan Asin ni Princesa Dña. Maria Sa Cahadean nin Valencia asin Asturias –«Cavall de Taula»–, text per primera vegada traduït a qualsevol llengua. Així mateix, analitzem les fonts i descrivim la història argumental i la presència de València al Romancer filipí con a treball comparatista que puga donar llum a la formalització del classicisme en les Lletres Filipines des de la literatura medieval de tradició hispànica.
Academic Leaders in the View of Distributed Leadership
Authors: Al Yahya Hissah
Published: February 2021

The study aimed to recognise the reality of academic leaders’ performances in Saudi universities in the view of distributed leadership from faculty members’ perspectives, as well as to identify the difficulties and proposed requirements for improving the performance of academic leaders in this view. To achieve the objectives of the study, descriptive surveys and two questionnaires were used to collect data. The study was applied to 247 academic leaders and 373 faculty members. The study concluded that the performance level of academic leaders in the view of distributed leadership was high. The difficulty levels of developing the performance of academic leaders in the view of introducing distributed leadership were also high. The score for requirements to develop the performance of academic leaders in the view of introducing distributed leadership was very high. Therefore, there were a number of recommendations made, including developing Saudi universities’ regulations to encourage them to distribute tasks and roles in an atmosphere of freedom and distance themselves from bureaucratic restrictions.
DEVELOPMENT OF PARAMETERS FOR SALTING PACIFIC HERRING FILLET INTENDED FOR CHILDREN'S NUTRITION
Authors: Konopleva Ekaterina , Abramova Liubov , Gershunskaya Valeria , Arnautov Maksim
Published: February 2021

The aim of the work was to develop the parameters of the process of salting Pacific herring fillet with a reduced salt content, intended for children’s nutrition. For salting, food salt with a reduced sodium content, enriched with potassium, magnesium, was used. Based on the conducted studies, a rational formulation of the salting mixture was selected, consisting of 5 % salt with a reduced sodium content, 4% sugar, 0.35-0.50% citric acid.

It was found that carrying out the salting process for 72-96 hours provides a low-salted fillet with a salt content of 3.5% with high organoleptic parameters, which are determined by the amino nitrogen content of 110-130 mg/100 g of the product and the buffering capacities of 40-45 degrees.
Russia ratified the FAO Agreement on Port State Measures to Combat IUU Fishing 2009
Authors: Bekyashev Kamil , Bekyashev Damir
Published: February 2021

The article examines the history of the development of the 2009 Agreement, analyzes in detail its main provisions. Taking into account the accession of the Russian Federation to this international treaty, recommendations and proposals for improving Russian legislation are prepared.
Innovative technologies of pasture lake fish farming in the Trans-Urals
Authors: Mukhachev Igor
Published: February 2021

The article describes the development of pasture lake fish farming within the forest-steppe Trans-Urals on the basis of improving the technologies of the fish-breeding process of one - year and two-year cultivation of commercial fish. Thanks to the introduction of integrated reclamation of lakes of the overseas type of the Trans-Urals and innovative fish farming technologies that use the reclamation effect of aeration of reservoirs in winter, loosening of bottom silt deposits during open water, the natural production potential of the lakes allowed to increase the fish productivity from 30-50 kg / year to 130-200 kg/ha per year. Based on the long-term monitoring of the ecological and fisheries situation of the lakes, it is recommended to intensify the process of modernization of existing fish farms and start creating new ones, which will significantly increase the importance of the Trans-Urals fisheries as part of the agro-industrial complex of Russia. It is recommended to include herbivorous fish – white Amur and white silver carp, and consumers of detritus and bottom silt-pilengas, which can effectively grow in salt water reservoirs, which are many within the southern Trans-Urals.
CRYOPRESERVATION OF SALMONIFORMES SPERM: CURRENT STATUS AND PERSPECTIVES
Authors: Dokina Olga , Krasilnikova Aleksandra , Kovalev Konstantin , Pronina Natalya
Published: February 2021

Analysis of information from published sources was carried out with the aim of determining the most perspective tendencies and technological approaches in the field of research of salmoniformes sperm cryopreservation methods. Comparative evaluation of currently used methods, analysis of their effectiveness, and discussion of possibility of cryopreservation protocols standardization for the use in aquaculture are presented in this review.
An alternative to modern salmon fishing gear
Authors: Telyatnik Oleg
Published: February 2021

Based on the study of work experience in the areas of p.o. Kamchatka in the work proposed alternative fishing tools for salmon fishing. Under the alternative in the work are called fishing tools that are not widely used or are new developments. The use of such fishing gear will make it possible to catch elk in areas where traditional fishing is not currently conducted. However, this is important due to the approach of salmonids, in 2020, to traditional fishing areas.
ELEMENTS INDICATING STOCK PRICE MOVEMENTS: THE CASE OF THE COMPANIES LISTED ON THE V4 STOCK EXCHANGES
Authors: Aliu Florin , Nadirov Orkhan , Nuhiu Artor
Published: February 2021

Stock markets stand as a financial mechanism that provides liquidity for firms and offers diversification benefits for investors. Stock markets in the Eastern European countries are weakform efficient which exposes them to speculative prices. This study investigates the influence of the macroeconomic and firm-specific factors on stock prices of the listed companies within the Visegrad Stock Markets. The study employs regression analyses based on a Pooled OLS and Fixed Effect models with year dummies and standard errors clustered at the country level, which are robust to autocorrelation and heteroscedasticity. Data collection consists of 55 listed companies based on the weekly stock prices, from January 2013 till December 2018. The results indicate that total equity is the only significant element that influences the individual stock prices of the companies in the four established models. Additionally, increase in supply of shares declines the current stock prices and the other way around. However, the exchange rate and inflation level indicate a negative influence on the stock prices with weaker significance. The findings show that stock markets of the V4 countries are overall inefficient since important indicators, such as economic activity, debt level, cash flow, firm size, oil, and gold prices have limited influence on the stock price movements.
Short-period Variability in the Globular Cluster NGC 419 and the SMC Field
Authors: Martínez-Vázquez C. E. , Salinas R. , Vivas A. K.
Published: February 2021

Delta Scuti (δ Sct) stars have been extensively studied in our Galaxy but far less in extragalactic systems. Here we study the population of δ Sct variables in NGC 419, an intermediate-age globular cluster of the Small Magellanic Cloud (SMC), using g, r, and i Gemini-S/Gemini Multi-Object Spectrograph (GMOS) time-series observations. Our goal is to study the role of such variables in the cluster extended main-sequence turnoff (MSTO). We report the discovery of 54 δ Sct stars and three eclipsing binaries in the NGC 419 field. We find only a handful of the δ Sct stars at the MSTO of NGC 419, while the majority are fainter, indicating that the cluster is younger (≲1.2 Gyr) than previously thought. Considering their radial distribution, we identify only six δ Sct stars as probable members of NGC 419, while the 48 remaining are likely δ Sct stars of the SMC field. Cluster δ Sct stars appear close to the red edge of the MSTO, supporting the idea that the extended MSTO has its origin in an age spread. The 48 field δ Sct stars represent the largest detection of δ Sct stars made in the SMC. The period distribution of these newly detected δ Sct stars (0.04 day ≲ P ≲ 0.15 day) is similar to that detected in other systems. The amplitude distribution (0.05 mag ≲ Δr ≲ 0.60 mag) is likely biased because of the lack of low-amplitude stars. We finally use the δ Sct stars to calculate distances using different period–luminosity relations. The average distance moduli obtained are 18.76 ± 0.14 mag for NGC 419 and 18.86 ± 0.11 mag for the SMC field, which agree with previous measurements.
The Spiral Galaxies Flat Rotational Velocity Curve Explained by the Constant Group Velocity of a Nonlinear Density Wave
Authors: Vukcevic Miroslava
Published: February 2021

The rotation velocity curves of stars in galaxies, the motions of pairs of galaxies, and the behavior of galaxies in clusters and super-clusters all indicate that there is a lack of mass on different scales in the universe. In this paper, we derive the expression for rotational velocity using the nonlinear density wave theory considering only stellar components and we show that such theory can support the observed flat rotational velocity curve due to the main property of the soliton wave, which is a constant group velocity of the wave. The surface mass density (SMD) function, used to derive gravitational potential gradient and rotational velocity, is not assumed but rather derived as a solution of the nonlinear Srödinger equation, on the contrary to the widely used, in the literature, exponential disk approximation. Three parameters relevant to the curve shape are the intensities of equilibrium SMD, the amplitude of the wave, and total angular velocity or differential rotation, equivalently. Since the shape of the rotational velocity is highly sensitive to the mentioned parameters, this theory eventually provides a method for a very accurate estimation of galaxy mass and angular velocity as well.
Analysis of Spectral Lines in Large Databases of Synthetic Spectra for Massive Stars
Authors: Fierro-Santillán Celia R. , Klapp Jaime , Sigalotti Leonardo Di G. , Zsargó Janos , Hareter Markus
Published: February 2021

In this paper, we describe a program that identifies in the optical spectrum the main parameters of a spectral line, namely the initial and final wavelengths, and the line depth. Moreover, using numerical calculations, it identifies and removes adjacent lines. Next, the program calculates the equivalent width and the FWHM. The software was tested in a sample of 300 lines in two databases of synthetic spectra generated by the CMFGEN and PoWR codes, and 300 lines in observed spectra from the IACOB database, showing a Gaussian distribution of relative errors, from which it is inferred that 80% of the measured lines have errors less than 17% and only 5% of the lines have errors greater than 26%. The program was also run on the entire database of 45,000 CMFGEN and 202 POWR synthetic spectra, generating a library of H i, He i, and He ii lines necessary to feed the FITspec code for the derivation of stellar parameters: effective temperature, surface gravity, and luminosity.
Probing the Cold Deep Depths of the California Molecular Cloud: The Icy Relationship between CO and Dust
Authors: Lewis John Arban , Lada Charles J. , Bieging John , Kazarians Anoush , Alves João , Lombardi Marco
Published: February 2021

We study the relationship between molecular gas and dust in the California Molecular Cloud over an unprecedented dynamic range of cloud depth (A
V = 3–60 mag). We compare deep Herschel-based measurements of dust extinction with observations of the 12CO, 13CO, and C18O J = 2 − 1 lines on sub-parsec scales across the cloud. We directly measure the ratio of CO integrated intensity to dust extinction to derive the CO X-factor at over 105 independent locations in the cloud. Confirming an earlier study, we find that no single 12CO X-factor can characterize the molecular gas in the cold (T
dust ≤ 20) regions of the cloud that account for most of its mass. We are able to derive a single-valued X-factor for all three CO isotopologues in the warm (T
dust > 25 K) material that is spatially coincident with an H ii region surrounding the star LkHα 101. We derive the LTE CO column densities for 13CO and C18O since we find both lines are relatively optically thin. In the warm cloud material, CO is completely in the gas phase and we are able to recover the total 13CO and C18O abundances. Using CO abundances and deep Herschel observations, we measure lower bounds to the freeze-out of CO onto dust across the whole cloud, finding some regions having CO depleted by a factor of >20. We construct the first maps of depletion that span the extent of a giant molecular cloud. Using these maps we identify 75 depletion-defined cores and discuss their physical nature.
Effect of Multipole Moments in the Weak Field Limit of a Black Hole Plus Halo Potential
Authors: Dubeibe Fredy L. , Saeed Tareq , Zotos Euaggelos E.
Published: February 2021

In this paper, we consider a Newtonian system whose relativistic counterpart describes a superimposed halo with a black hole. Our aim is to determine how the quadrupole and octupole moments affect the nature of the motion of a test particle, moving in the close vicinity of the black hole. The different types of trajectories for the test particle are mainly classified as bounded, collisional, and escaping, by using modern color-coded basin diagrams. Moreover, an additional analysis is carried out for distinguishing between the different types of bounded motion (regular, sticky, and chaotic). Our results strongly indicate that the multipole moments, along with the total orbital energy, highly affect the final state of the test particle, while at the same time the basin geometry of the phase space tends to be highly dominated by collision and escape orbits.
In Situ Evidence of Ion Acceleration between Consecutive Reconnection Jet Fronts
Authors: Catapano Filomena , Retinò Alessandro , Zimbardo Gaetano , Alexandrova Alexandra , Cohen Ian J. , Turner Drew L. , Le Contel Olivier , Cozzani Giulia , Perri Silvia , Greco Antonella , Breuillard Hugo , Delcourt Dominique , Mirioni Laurent , Khotyaintsev Yuri , Vaivads Andris , Giles Barbara L. , Mauk Barry H. , Fuselier Stephen A. , Torbert Roy B. , Russell Christopher T. , Lindqvist Per A. , Ergun Robert E. , Moore Thomas , Burch James L.
Published: February 2021

Processes driven by unsteady reconnection can efficiently accelerate particles in many astrophysical plasmas. An example is the reconnection jet fronts in an outflow region. We present evidence of suprathermal ion acceleration between two consecutive reconnection jet fronts observed by the Magnetospheric Multiscale mission in the terrestrial magnetotail. An earthward propagating jet is approached by a second faster jet. Between the jets, the thermal ions are mostly perpendicular to magnetic field, are trapped, and are gradually accelerated in the parallel direction up to 150 keV. Observations suggest that ions are predominantly accelerated by a Fermi-like mechanism in the contracting magnetic bottle formed between the two jet fronts. The ion acceleration mechanism is presumably efficient in other environments where jet fronts produced by variable rates of reconnection are common and where the interaction of multiple jet fronts can also develop a turbulent environment, e.g., in stellar and solar eruptions.
DR 21 South Filament: A Parsec-sized Dense Gas Accretion Flow onto the DR 21 Massive Young Cluster
Authors: Hu Bo , Qiu Keping , Cao Yue , Liu Junhao , Wang Yuwei , Li Guangxing , Shen Zhiqiang , Li Juan , Wang Junzhi , Li Bin , Dong Jian
Published: February 2021

DR 21 south filament (DR21SF) is a unique component of the giant network of filamentary molecular clouds in the north region of the Cygnus X complex. Unlike the highly fragmented and star-forming active environment wherein it resides, DR21SF exhibits a coherent profile in the column density map with very few star formation signposts, even though the previously reported linear density of the filament is an order of magnitude higher than the thermal stable threshold. We derive the size (3.6 pc by 0.13 pc), temperature (10–15 K), and mass (1048 M
⊙) of DR21SF from our single-dish observations of NH3 (1, 1) and (2, 2) inversion lines in conjunction with the column density map from our previous work. Star-forming sites are identified along the filament where gas temperature is excessive. We find clear gradients in radial velocity and intrinsic line width along the spine of the filament. The gradients can be well interpreted by a scenario of an accretion flow feeding DR 21 at a mass transfer rate of 1.1 × 10−3
M
⊙ yr−1. Based on the analysis of its kinematic temperature, intrinsic line width, and mass distribution, we conclude that DR21SF is in an overall trans-critical status, which indicates an early evolutionary stage.
Probing the Hot Circumgalactic Medium with Broad O vi and X-Rays
Authors: Mathur Smita , Gupta Anjali , Das Sanskriti , Krongold Yair , Nicastro Fabrizio
Published: February 2021

Most of the baryonic mass in the circumgalactic medium (CGM) of a spiral galaxy is believed to be warm-hot, with temperature around 106 K. The narrow O vi absorption lines probe a somewhat cooler component at

, but broad O vi absorbers have the potential to probe the hotter CGM. Here we present 376 ks Chandra LETG observations of a carefully selected galaxy in which the presence of broad O vi together with the non-detection of Lyα was indicative of hot gas. The strongest line expected to be present at ≈106 K is O vii
λ21.602. There is a hint of an absorption line at the redshifted wavelength, but the line is not detected with better than 2σ significance. A physical model, taking into account strengths of several other lines, provides better constraints. Our best-fit absorber model has

and

. These parameters are consistent with the hot plasma model based on UV observations; other O vi models of cooler gas phases are ruled out at better than 99% confidence. Thus we have suggestive, but not conclusive evidence for the broad O vi absorber probing the hot gas from the shallow observations of this pilot program. About 800 ks of XMM-Newton observations will detect the expected absorption lines of O vii and O viii unequivocally. Future missions like XRISM, Arcus, and Athena will revolutionize the CGM science.
Evolution of Stellar Feedback in H ii Regions
Authors: Olivier Grace M. , Lopez Laura A. , Rosen Anna L. , Nayak Omnarayani , Reiter Megan , Krumholz Mark R. , Bolatto Alberto D.
Published: February 2021

Stellar feedback is needed to produce realistic giant molecular clouds and galaxies in simulations, but due to limited numerical resolution, feedback must be implemented using sub-grid models. Observational work is an important means to test and anchor these models, but limited studies have assessed the relative dynamical role of multiple feedback modes, particularly at the earliest stages of expansion when H ii regions are still deeply embedded. In this paper, we use multiwavelength (radio, infrared, and X-ray) data to measure the pressures associated with direct radiation (P
dir), dust-processed radiation (P
IR), photoionization heating (P
H II
), and shock-heating from stellar winds (P
X) in a sample of 106 young, resolved H ii regions with radii ≲0.5 pc to determine how stellar feedback drives their expansion. We find that the P
IR dominates in 84% of the regions and that the median P
dir and P
H II
are smaller than the median P
IR by factors of ≈6 and ≈9, respectively. Based on the radial dependences of the pressure terms, we show that H ii regions transition from P
IR-dominated to P
H II
-dominated at radii of ∼3 pc. We find a median trapping factor of f
trap ∼ 8 without any radial dependence for the sample, suggesting this value can be adopted in sub-grid feedback models. Moreover, we show that the total pressure is greater than the gravitational pressure in the majority of our sample, indicating that the feedback is sufficient to expel gas from the regions.
A Systematic Study of Gamma-Ray Flares from the Crab Nebula with Fermi-LAT. I. Flare Detection
Authors: Huang Xiaoyuan , Yuan Qiang , Fan Yi-Zhong
Published: February 2021

Significant flares of GeV γ-ray emission from the Crab Nebula were found by AGILE and Fermi-LAT years ago, indicating that extreme particle acceleration and radiation occurs in young pulsar wind nebulae. To enlarge the flare sample and to investigate their statistical properties will be very useful in understanding the nature of the γ-ray flares. In this paper, we investigate the flaring emission from the Crab Nebula with eleven year observations of the Fermi-LAT. We identify 17 significant flares in the light curve of the low-energy (synchrotron) component of the γ-ray emission. The flare rate is about 1.5 per year, without any significant change or clustering during the 11 years of the observation. We detect a special flare with an extremely long duration of nearly one month, that occurred in 2018 October, with synchrotron photons up to energies of about 1 GeV. The synchrotron component could be fitted by a steady power-law (PL) background and a variable flare component with an exponentially cutoff PL spectrum, not only for the individual flare but also for the combined data, which may favor a similar emission mechanism for all flares. However, we do not find a universal relation between the cutoff energy and the energy fluxes of the flares, which may reflect the complicated acceleration and/or cooling processes of the involved particles.
Assessment of Cr Isotopic Heterogeneities of Volatile-rich Asteroids Based on Multiple Planet Formation Models
Authors: Fukai Ryota , Arakawa Sota
Published: February 2021

Describing the comprehensive evolutionary scenario for asteroids is key to explaining the various physical processes of the solar system. Bulk-scale carbonaceous chondrites (CCs) possibly record the primordial information associated with the formation processes of their parent bodies. In this study, we tried to estimate the relative formation region of volatile-rich asteroids by utilizing the nucleosynthetic Cr isotopic variation (54Cr/52Cr) in bulk-scale CCs. Numerical calculations were conducted to track the temporal evolution of isotopically different (solar and presolar) dust and 54Cr/52Cr values for mixed materials with disk radius. First, we found that isotopic heterogeneities in CC formation regions were preserved with a weak turbulence setting that increased the timescales of the advection and diffusion in the disk. Second, we assessed the effects of gaps formed by giant planets. Finally, the distance from the injected supernovae and Cr isotopic compositions of the presolar grains were investigated in terms of the estimated formation region of CCs. In our results, a plausible formation region of four types of CCs could be obtained with the supernova from approximately 2 pc and typical Cr isotopic compositions of presolar grains. Among the parent bodies of CCs (i.e., volatile-rich asteroids), B-type asteroids formed in the outermost region, which is inconsistent with the present population, showing that D-type asteroids are generally located beyond most of the C-complex asteroids. Both the initial and present orbits of asteroids might be explained by the scatter attributed to the inward-outward migration of Jupiter and Saturn.
Growth of Stellar-mass Black Holes in Dense Molecular Clouds and GW190521
Authors: Rice Jared R. , Zhang Bing
Published: February 2021

A stellar-mass black hole can grow its mass noticeably through Bondi accretion, if it is embedded in an extremely dense and massive molecular cloud with slow motion with respect to the ambient medium for an extended period of time. This provides a novel, yet challenging channel for the formation of massive stellar-mass black holes. We discuss how this channel may account for the massive binary black hole merger system GW190521 as observed by LIGO/Virgo gravitational wave detectors as well as the claimed massive black hole candidate LB-1.
Gravitational Wave Implications for the Parity Symmetry of Gravity in the High Energy Region
Authors: Wang Yi-Fan , Niu Rui , Zhu Tao , Zhao Wen
Published: February 2021

Einstein's general relativity, as the most successful theory of gravity, is one of the cornerstones of modern physics. However, the experimental tests for gravity in the high energy region are limited. The emerging gravitational-wave astronomy has opened an avenue for probing the fundamental properties of gravity in a strong and dynamical field, and in particular, a high energy regime. In this work, we test the parity conservation of gravity with gravitational waves. If the parity symmetry is broken, the left- and right-handed modes of gravitational waves would follow different equations of motion, dubbed as birefringence. We perform full Bayesian inference by comparing the state-of-the-art waveform with parity violation with the compact binary coalescence data released by LIGO and Virgo collaboration. We do not find any violations of general relativity, thus constrain the lower bound of the parity-violating energy scale to be 0.09 GeV through the velocity birefringence of gravitational waves. This provides the most stringent experimental test of gravitational parity symmetry to date. We also find third generation gravitational-wave detectors can enhance this bound to

GeV if there is still no violation, comparable to the current energy scale in particle physics, which indicates gravitational-wave astronomy can usher in a new era of testing the ultraviolet behavior of gravity in the high energy region.
Multimorbidity Burden in Rheumatoid Arthritis: A Population-based Cohort Study
Authors: Gunderson Tina M. , Myasoedova Elena , Davis John M. , Crowson Cynthia S.
Published: February 2021

Objective

To estimate the prevalence and incidence of multimorbidity (MM) in a population-based cohort of patients with rheumatoid arthritis (RA) compared to subjects without RA.

Methods

Between 1999–2013, residents of Olmsted County, Minnesota with incident RA who met the 1987 American College of Rheumatology criteria were compared to age- and sex-matched non-RA subjects from the same population. Twenty-five chronic comorbidities from a combination of the Charlson, Elixhauser, and Rheumatic Disease Comorbidity Indices were included, excluding rheumatic comorbidities. The Aalen-Johansen method was used to estimate the cumulative incidence of MM (MM2+; ≥ 2 chronic comorbidities) or substantial MM (MM5+; ≥ 5), adjusting for the competing risk of death.

Results

The study included 597 patients with RA and 594 non-RA subjects (70% female, 90% White, mean age 55.5 yrs). At incidence/index date, the prevalence of MM2+ was higher in RA than non-RA subjects (38% RA vs 32% non-RA, P = 0.02), whereas prevalence of MM5+ was similar (5% RA vs. 4% non-RA, P = 0.68). During follow-up (median 11.6 yrs RA, 11.3 yrs non-RA), more patients with RA developed MM2+ (214 RA vs 188 non-RA; adjusted HR 1.39, 95% CI 1.14–1.69). By 10 years after RA incidence/index, the cumulative incidence of MM2+ was 56.5% among the patients with RA (95% CI 56.5–62.3%) compared with 47.9% among the non-RA (95% CI 42.8–53.7%). Patients with RA showed no evidence of increase in incidence of MM5+ (adjusted HR 1.17, 95% CI 0.93–1.47).

Conclusion

Patients with RA have both a higher prevalence of MM at the time of RA incidence as well as increased incidence thereafter.
Proceedings of the 2020 GRAPPA Collaborative Research Network (CRN) Meeting
Authors: Stober Carmel , Jadon Deepak R. , Armstrong April W. , Chandran Vinod , de Wit Maarten , Helliwell Philip S. , Mease Philip , Ogdie Alexis , O’Sullivan Denis , Pennington Stephen R. , Löve Thorvardur , Cauli Alberto , van Mens Leonieke , Waxman Robin , Scher Jose U. , Barton Anne , Ritchlin Christopher T. , FitzGerald Oliver
Published: February 2021

At the 2020 Group for Research and Assessment of Psoriasis and Psoriatic Arthritis (GRAPPA)- Collaborative Research Network (CRN) annual meeting, the GRAPPA-CRN group presented a pilot investigator-initiated study protocol to test electronic case report forms (eCRFs) and proposed Standardized Operating Procedures (SOPs) to evaluate biomarkers of psoriatic arthritis (PsA) associated with axial disease. The progress on 3 studies was also presented: BioDAM PsA (Biomarkers as Predictors of structural DAMage in PsA; to validate soluble biomarkers as predictors of structural damage in PsA), PreventPsA (examining the development of PsA and risk factors among patients with psoriasis and no arthritis), and PredictORPsA (Predicting Treatment respOnse in patients with eaRly PsA; in collaboration with Pfizer using samples from the Oral Psoriatic Arthritis TriaL [OPAL], to identify biomarkers of treatment response). GRAPPA-CRN funding partnerships and applications are also underway with both the Innovative Medicines Initiative (IMI) in Europe and Accelerating Medicines Partnerships (AMP) 2.0 in the USA, and the progress of these applications and associated objectives were presented.
El Colegio de niños desamparados de Santa Isabel la Real de Madrid: origen, construcción y primera ornamentación (1592-1610)
Authors: Muñoz Martín Roberto
Published: February 2021

Los años que transcurren desde la creación por parte de Felipe II del Colegio de Santa Isabel, hasta la llegada de la comunidad de monjas que lo habitan, es bastante desconocido y confuso. A través de la documentación, en especial de un inventario inédito de 1601, se aporta información relevante acerca del funcionamiento del hospicio y de algunas obras de arte que aún hoy día se guardan en sus muros. Destaca la descripción de la iglesia de la fundación, que se creía nunca existió como tal, y se aportan datos acerca de los bienes muebles que en ella estuvieron.
A Brief Overview of Lab - Scale Apparatuses Used in the Recent Years for Experimental Investigations on Gas Hydrates
Authors: Gambelli Alberto Maria , Sharma Deepak Kumar , Alleori Riccardo , Castaldi Marco J. , Nicolini Andrea , Rossi Federico
Published: February 2021

Gas hydrates are nonstoichiometric solid crystalline compound, whose formation is function of several parameters, such as pressure, temperature, fluid phase composition, reservoir saturation degree and others. One of the most critical aspects related to the research on this manner stays in differences existing between experimental results reached by using different experimental apparatuses. Moreover, laboratory scale reactors often have very contained dimensions with a consequent increasing influence of the boundary conditions. In the present paper, a brief overview of reactors used worldwide for experimental research on gas hydrates formation, is provided. In particular, the surface/volume ratio was calculated for each different typology of reactor and then associated with the ratio between moles of guest compound entrapped into water cages and moles injected. Even if such ratio does not represent the process efficiency, it is proportional to it. Consequently, that comparison was useful to well define the supporting effect of a greater S/V ratio on the hydrate formation process efficiency.
Failure Investigation and Crack Propagation Analysis of LP Blade Steam Turbine 220 MW
Authors: Damanik Natalina , Dahlan Hendery
Published: February 2021

The cracked blade in L-0, L-1 governor side, and L-1 generator side were found when A 220 MW low-pressure steam turbine was checked in the serious inspection. However, the crack population more dominant at L-1 Gen compared to L-0 Gov and L-1 Gov. Most of the cracks were located on 300-400 mm from the root of the blade span, and it did not associate with the pitting defect. In this study, the root cause of L-1 blade failure was investigated. There is three-stage of analyzing process, firstly capturing the airfoil and dimension of L-1—secondly, the material properties analysis, and finally stress analysis of L-1 by the finite element analysis software. L-1 is the blade with the chord length on the tip L-1 blade longer than root as 2.1% and the angle of an airfoil from root to tip twisted as 24 degrees. The type of material did not look precisely similar to AISI 422 because its hardness-strength is lower than AISI 422 as 5.1%. The finite element analysis shows that there was a symptom of the imprecise shroud gap that promoted maximum stress at 300-400 mm from the root area of the L-1 blade span. Moreover, a lack of hardness-strength material cannot accommodate the excessive movement of the blade and promoted the initial crack of L-1. A crack length blade as 16 mm shows a lower number of cyclic (Nf) to failure tremendously compared to standard blades such as 32,367 of the number cyclic for regular blade and 42.6 for the crack blade. Increasing 2 mm of initial crack will decrease significantly the number of cyclic Nf of the blade. It was tearing mode crack propagation of L-1 results a significant stress intensity factor compared to other modes, especially at 16 mm length of the crack.
A Belief-Based Parenting Behavior Model for Promoting Family's Ability to Care for Children with Avoidant Restrictive Food Intake Disorder (Arfid) in Indonesia
Authors: Prasetyo Yoyok Bekti , Nursalam Nursalam , Widyawati Ika Yuni , Hargono Rahmat , Ahsan Ahsan , Kumboyono Kumboyono
Published: February 2021

Background

Family's ability to care for children with avoidant restrictive food intake disorder (ARFID) is a central indicator in preventing the children from worse nutritional disorders. Environmental factor, child factor, caregiving behavioral systems, and beliefs can improve the family's ability to care for children. The aim of this research was to analyze the effect of environmental factor, child factor, caregiving behavioral systems, and beliefs on the family's ability to care for children with ARFID.

Design and methods

This cross-sectional research was carried out on 245 families with children suffering from ARFID in Malang Regency, in the working area of the Health Office of Malang Regency. The population of this research was families with children suffering from ARFID within the working area of the Health Office of Malang Regency. The research sample size was computed using the rule of thumb in structural equation modeling (SEM), the sample size used was 245.

Results

Results showed that the family's ability to care for children with ARFID was highly influenced by the caregiver's belief (t = 21.796; β = 0.713). Caregiver's belief became a dominant factor in the promotion of the family's ability to care for children with ARFID. A caregiver's belief was influenced by his/her behavior.

Conclusions

It was concluded that the caregiver's belief serves as a primary factor in the promotion of the family's ability to care for children with ARFID. A caregiver's behavior holds a prominent role in influencing his/her belief in providing care for children suffering from ARFID.