bluuebunny/crossref_metadata_2025 huggingface dataset:
Varstrometry for Off-nucleus and Dual Subkiloparsec Active Galactic Nuclei (VODKA): Investigating the Nature of SDSS J0823+2418 at z = 1.81, A Likely Lensed Quasar
Authors: Gross Arran C. , Chen Yu-Ching , Foord Adi , Liu Xin , Shen Yue , Oguri Masamune , Goulding Andy , Hwang Hsiang-Chih , Zakamska Nadia L. , Ma 马 Yilun 逸伦 , Nolan Liam
Published: October 2023

Dual quasars at small physical separations are an important precursor phase of galaxy mergers, ultimately leading to the coalescence of the two supermassive black holes. Starting from a sample of dual and/or lensed quasar candidates discovered using astrometric jitter in Gaia data, we present a pilot case study of one of the most promising yet puzzling candidate dual quasars at cosmic noon (z ∼ 1.8). Using multiwavelength imaging and spectroscopy from X-ray to radio, we test whether the SDSS J0823+2418 system is two individual quasars in a bound pair at separation ∼0.″64, or instead a single quasar being gravitationally lensed by a foreground galaxy. We find consistent flux ratios (∼1.25−1.45) between the two sources in optical, near-IR (NIR), UV, and radio, and thus similar spectral energy distributions, suggesting a strong-lensing scenario. However, differences in the radio spectral index, as well as changing X-ray fluxes, hint at either a dual quasar with otherwise nearly identical properties or perhaps lensing-based time lag of ∼3 days paired with intrinsic variability. We find with lens mass modeling that the relative NIR positions and magnitudes of the two quasars and a marginally detected central galaxy are consistent with strong lensing. Archival Sloan Digital Sky Survey spectra likewise suggest a foreground absorber via Mg ii absorption lines. We conclude that SDSS J0823+2418 is likely a lensed quasar, and therefore that the VODKA sample contains a population of these lensed systems (perhaps as high as 50%) as well as dual quasars.
The Global Structure of Molecular Clouds. I. Trends with Mass and Star Formation Rate
Authors: Imara Nia , Forbes John C.
Published: October 2023

We introduce a model for the large-scale, global 3D structure of molecular clouds. Motivated by the morphological appearance of clouds in surface density maps, we model clouds as cylinders, with the aim of backing out information about the volume density distribution of gas and its relationship to star formation. We test our model by applying it to surface density maps for a sample of nearby clouds and find solutions that fit each of the observed radial surface density profiles remarkably well. Our most salient findings are that clouds with higher central volume densities are more compact and also have lower total mass. These same lower-mass clouds tend to have shorter gas depletion times, regardless of whether we consider their total mass or dense mass. Our analyses lead us to conclude that cylindrical clouds can be characterized by a universal structure that sets the timescale on which they form stars.
Relative Intrinsic Scatter in Hierarchical Type Ia Supernova Sibling Analyses: Application to SNe 2021hpr, 1997bq, and 2008fv in NGC 3147
Authors: Ward Sam M. , Thorp Stephen , Mandel Kaisey S. , Dhawan Suhail , Jones David O. , Taggart Kirsty , Foley Ryan J. , Narayan Gautham , Chambers Kenneth C. , Coulter David A. , Davis Kyle W. , de Boer Thomas , de Soto Kaylee , Earl Nicholas , Gagliano Alex , Gao Hua , Hjorth Jens , Huber Mark E. , Izzo Luca , Langeroodi Danial , Magnier Eugene A. , McGill Peter , Rest Armin , Rojas-Bravo César , Wojtak Radosław ,   Young Supernova Experiment
Published: October 2023

We present Young Supernova Experiment grizy photometry of SN 2021hpr, the third Type Ia supernova sibling to explode in the Cepheid calibrator galaxy, NGC 3147. Siblings are useful for improving SN-host distance estimates and investigating their contributions toward the SN Ia intrinsic scatter (post-standardization residual scatter in distance estimates). We thus develop a principled Bayesian framework for analyzing SN Ia siblings. At its core is the cosmology-independent relative intrinsic scatter parameter, σ
Rel: the dispersion of siblings distance estimates relative to one another within a galaxy. It quantifies the contribution toward the total intrinsic scatter, σ
0, from within-galaxy variations about the siblings’ common properties. It also affects the combined distance uncertainty. We present analytic formulae for computing a σ
Rel posterior from individual siblings distances (estimated using any SN model). Applying a newly trained BayeSN model, we fit the light curves of each sibling in NGC 3147 individually, to yield consistent distance estimates. However, the wide σ
Rel posterior means σ
Rel ≈ σ
0 is not ruled out. We thus combine the distances by marginalizing over σ
Rel with an informative prior: σ
Rel ∼ U(0, σ
0). Simultaneously fitting the trio’s light curves improves constraints on distance and each sibling’s individual dust parameters, compared to individual fits. Higher correlation also tightens dust parameter constraints. Therefore, σ
Rel marginalization yields robust estimates of siblings distances for cosmology, as well as dust parameters for sibling–host correlation studies. Incorporating NGC 3147's Cepheid distance yields H
0 = 78.4 ± 6.5 km s−1 Mpc−1. Our work motivates analyses of homogeneous siblings samples, to constrain σ
Rel and its SN-model dependence.
Discovery of the Magellanic Stellar Stream Out to 100 kpc
Authors: Chandra Vedant , Naidu Rohan P. , Conroy Charlie , Bonaca Ana , Zaritsky Dennis , Cargile Phillip A. , Caldwell Nelson , Johnson Benjamin D. , Han Jiwon Jesse , Ting 丁 Yuan-Sen 源森
Published: October 2023

The Magellanic Stream (MS)—an enormous ribbon of gas spanning 140° of the southern sky trailing the Magellanic Clouds—has been exquisitely mapped in the five decades since its discovery. However, despite concerted efforts, no stellar counterpart to the MS has been conclusively identified. This stellar stream would reveal the distance and 6D kinematics of the MS, constraining its formation and the past orbital history of the Clouds. We have been conducting a spectroscopic survey of the most distant and luminous red giant stars in the Galactic outskirts. From this data set, we have discovered a prominent population of 13 stars matching the extreme angular momentum of the Clouds, spanning up to 100° along the MS at distances of 60–120 kpc. Furthermore, these kinematically selected stars lie along an [α/Fe]-deficient track in chemical space from −2.5 < [Fe/H] <− 0.5, consistent with their formation in the Clouds themselves. We identify these stars as high-confidence members of the Magellanic Stellar Stream. Half of these stars are metal-rich and closely follow the gaseous MS, whereas the other half are more scattered and metal-poor. We argue that the metal-rich stream is the recently formed tidal counterpart to the MS, and we speculate that the metal-poor population was thrown out of the SMC outskirts during an earlier interaction between the Clouds. The Magellanic Stellar Stream provides a strong set of constraints—distances, 6D kinematics, and birth locations—that will guide future simulations toward unveiling the detailed history of the Clouds.
FAST Discovery of a Fast Neutral Hydrogen Outflow
Authors: Su Renzhi , Gu Minfeng , Curran S. J. , Mahony Elizabeth K. , Tang Ningyu , Allison James R. , Li Di , Zhu Ming , Aditya J. N. H. S. , Yoon Hyein , Zheng Zheng , Wu Zhongzu
Published: October 2023

In this letter, we report the discovery of a fast neutral hydrogen outflow in SDSS J145239.38+062738.0, a merging radio galaxy containing an optical type I active galactic nucleus (AGN). This discovery was made through observations conducted by the Five-hundred-meter Aperture Spherical radio Telescope (FAST) using redshifted 21 cm absorption. The outflow exhibits a blueshifted velocity likely up to ∼−1000 km s−1 with respect to the systemic velocity of the host galaxy with an absorption strength of ∼−0.6 mJy beam−1 corresponding to an optical depth of 0.002 at v = −500 km s−1. The mass outflow rate ranges between 2.8 × 10−2 and 3.6 M
⊙ yr−1, implying an energy outflow rate ranging between 4.2 × 1039 and 9.7 × 1040 erg s−1, assuming 100 K < T
s < 1000 K. Plausible drivers of the outflow include the starbursts, AGN radiation, and radio jet, the last of which is considered the most likely culprit according to the kinematics. By analyzing the properties of the outflow, AGN, and jet, we find that if the H i outflow is driven by the AGN radiation, the AGN radiation does not seem powerful enough to provide negative feedback, whereas the radio jet shows the potential to provide negative feedback. Our observations contribute another example of a fast outflow detected in neutral hydrogen and demonstrate the capability of FAST in detecting such outflows.
SN 2022jli: A Type Ic Supernova with Periodic Modulation of Its Light Curve and an Unusually Long Rise
Authors: Moore T. , Smartt S. J. , Nicholl M. , Srivastav S. , Stevance H. F. , Jess D. B. , Grant S. D. T. , Fulton M. D. , Rhodes L. , Sim S. A. , Hirai R. , Podsiadlowski P. , Anderson J. P. , Ashall C. , Bate W. , Fender R. , Gutiérrez C. P. , Howell D. A. , Huber M. E. , Inserra C. , Leloudas G. , Monard L. A. G. , Müller-Bravo T. E. , Shappee B. J. , Smith K. W. , Terreran G. , Tonry J. , Tucker M. A. , Young D. R. , Aamer A. , Chen T.-W. , Ragosta F. , Galbany L. , Gromadzki M. , Harvey L. , Hoeflich P. , McCully C. , Newsome M. , Gonzalez E. P. , Pellegrino C. , Ramsden P. , Pérez-Torres M. , Ridley E. J. , Sheng X. , Weston J.
Published: October 2023

We present multiwavelength photometry and spectroscopy of SN 2022jli, an unprecedented Type Ic supernova discovered in the galaxy NGC 157 at a distance of ≈ 23 Mpc. The multiband light curves reveal many remarkable characteristics. Peaking at a magnitude of g = 15.11 ± 0.02, the high-cadence photometry reveals periodic undulations of 12.5 ± 0.2 days superimposed on the 200-day supernova decline. This periodicity is observed in the light curves from nine separate filter and instrument configurations with peak-to-peak amplitudes of ≃ 0.1 mag. This is the first time that repeated periodic oscillations, over many cycles, have been detected in a supernova light curve. SN 2022jli also displays an extreme early excess that fades over ≈25 days, followed by a rise to a peak luminosity of L
opt = 1042.1 erg s−1. Although the exact explosion epoch is not constrained by data, the time from explosion to maximum light is ≳ 59 days. The luminosity can be explained by a large ejecta mass (M
ej ≈ 12 ± 6 M
⊙) powered by 56Ni, but we find it difficult to quantitatively model the early excess with circumstellar interaction and cooling. Collision between the supernova ejecta and a binary companion is a possible source of this emission. We discuss the origin of the periodic variability in the light curve, including interaction of the SN ejecta with nested shells of circumstellar matter and neutron stars colliding with binary companions.
Quasiperiodic Peak Energy Oscillations in X-Ray Bursts from SGR J1935+2154
Authors: Roberts Oliver J. , Baring Matthew G. , Huppenkothen Daniela , Kouveliotou Chryssa , Göğüş Ersin , Kaneko Yuki , Lin Lin , van der Horst Alexander J. , Younes George
Published: October 2023

Magnetars are young neutron stars powered by the strongest magnetic fields in the Universe (1013–15 G). Their transient X-ray emission usually manifests as short (a few hundred milliseconds), bright, energetic (∼1040–41 erg) X-ray bursts. Since its discovery in 2014, SGR J1935+2154 has become one of the most prolific magnetars, exhibiting very active bursting episodes and other fascinating events, such as pulse timing antiglitches and fast radio bursts. Here we present evidence for possible 42 Hz (24 ms) quasiperiodic oscillations in the ν
F

ν
spectrum peak energy (E

p
) identified in a unique burst detected with the Fermi Gamma-ray Burst Monitor in 2022 January. While quasiperiodic oscillations have been previously reported in the intensity of magnetar burst light curves, quasiperiodic oscillations in E

p
have not. We also find an additional event from the same outburst that appears to exhibit a similar character in E

p
, albeit of lower statistical quality. For these two exceptional transients, such E

p
oscillations can be explained by magnetospheric density and pressure perturbations. For burst-emitting plasma consisting purely of e
+
e
− pairs, these acoustic modes propagate along a highly magnetized flux tube of length up to around L ∼ 130 neutron star radii, with L being lower if ions are present in the emission zone. Detailed time-resolved analyses of other magnetar bursts are encouraged to evaluate the rarity of these events and their underlying mechanisms.
A Pipeline for Modeling Rapidly Rotating Stars
Authors: Sackrider Jackson L. , Aufdenberg Jason P.
Published: October 2023

Recent stellar intensity interferometry observations of stars at 416 nm complement Michelson interferometry observations in the near-infrared where stellar surface intensity gradients (e.g., limb darkening) are weaker. Intensity gradients due to gravity darkening in rapidly rotating stars are also expected to show higher contrast at 416 nm relative to the near-infrared. We have created a software pipeline to model stellar photospheres of rapidly rotating stars to compare predictions at these wavelength regions. The pipeline can produce model images, visibility predictions, and synthetic spectra. Here we show examples for the Be star β CMi, which has not been interferometrically imaged. We see higher contrast from gravity darkening at 416 nm in model images for rapid rotators, but only for those stars that are not viewed equator-on.
Descriptive study of the intrinsic muscles of the shoulder and brachium in kinkajou (Potos flavus) and an evolutionary analysis within the suborder Caniformia
Authors: Vélez-García Juan Fernando , Carrión Blanco Diego Alejandro , Moreno Gómez Gabriela , San Martín Cañas Stephanie
Published: October 2023

Abstract

The kinkajou (Potos flavus) is a carnivoran of the suborder Caniformia and the family Procyonidae, inhabiting regions throughout Central and South America. Potos flavus has arboreal preferences and exhibits unique anatomical adaptations that facilitate movement within trees. Its pelvic limbs enable hindfoot reversal, while its thoracic limbs possess remarkable prehensile capabilities. Previous anatomical studies in Potos flavus have presented discrepancies in the description of the intrinsic shoulder and brachial muscles. Therefore, this study aims to provide a comprehensive anatomical description of these muscles in five specimens. The findings are compared with descriptions reported for other caniforms. The application of the Density-Based Spatial Clustering of Application with Noise (DBSCAN) algorithm aids in identifying relationships among caniforms based on the presence or absence of specific muscles. Our analysis reveals several key differences, including the presence of a biceps brachii with two capita (longum and breve), two coracobrachiales muscles (longus and brevis), a tensor fasciae antebrachii with two distinct parts (cranialis and caudalis), and an anconeus medialis. The caput breve of the biceps brachii and coracobrachialis longus muscles are absent in some individuals, with prevalence rates of 10% and 20%, respectively. One specimen exhibited an accessory caput laterale of the m. triceps brachii bilaterally. The comparative analysis suggests that the shoulder and brachial muscles of Potos flavus share more similarities with those of Ailurus fulgens and ursids of the genera Ursus and Tremarctos. These findings suggest the retention of muscles that may have been present in the common ancestor of the infraorder Arctoidea.
Bion et le rêve. Un processus continu à la source de la vie psychique
Authors: Messina Diana
Published: October 2023

Résumé Bion ouvre la psychanalyse à des paradigmes novateurs et féconds. Un de ces paradigmes concerne le rêve, barrière de contact, formée par une succession d’éléments alpha, continuellement à l’œuvre, qui crée la différenciation conscient-inconscient. Le rêve, fonction alpha, est conçu comme un principe de transformation continu à la source de la vie psychique. Il s’ancre dans l’expérience émotionnelle et est à la base de la rêverie, qui permet d’accueillir les identifications projectives. La relation contenant-contenu qui en découle ouvre le rêve à une approche interpsychique. L’attaque des liens internes dégrade la psyché et la fonction onirique elle-même, avec renversement de direction de la fonction alpha et destruction de la barrière de contact.
Écriture et numérique : l’humain au-delà de la machine
Authors: Chocron Michael
Published: October 2023

L’informatique amène d’une part la relation avec l’ordinateur, une machine qui semble animée, et d’autre part la possibilité d’être en relation constante avec d’autres. La machine est alors un intermédiaire relationnel qui soit s’efface pour donner accès à autrui à qui l’on peut écrire à tout moment, soit efface l’homme qui a écrit le programme utilisé. Après avoir analysé cela, nous traiterons de comment l’informatique a modifié en partie certains modes relationnels, ce que nous pouvons retrouver en séance dans le cadre d’un travail psychothérapeutique.
Fille vs Garçon : entre Croyance et Conviction ?
Authors: Lippe Didier
Published: October 2023

Que Maurice s’affirme et opère sa transformation physique en Madeleine, pour «  retrouver sa véritable nature  », n’est pas sans nous poser quelques questions, à son propos,… au nôtre. Quelle force extrême, ou quels mécanismes psychiques, (re)mettant en question tout un « être », une vie, amènent à cette conviction ou cette croyance intime et radicale ? Ils sont assurément à la mesure des enjeux vitaux qui sont là engagés, jusqu’à parfois engendrer « transition » et « réassignation sexuée ». « L’être de nature » et « l’être de culture » ne mobilisent pas les mêmes processus identificatoires de la construction psychique, sans pour autant s’exclure mutuellement, et l’on donnera une place importante à la notion « d’après-coup » dans ces questionnements.
À l’écoute des adolescents transgenres le premier entretien
Authors: Adrian Valérie
Published: October 2023

Être à l’écoute des adolescents transgenres présuppose de connaître l’évolution générationnelle du concept de transsexualisme au concept de transidentité. Dans le contexte actuel de révolution numérique, les adolescents accèdent aux « savoirs trans » et le nombre de « coming out » transgenres à l’adolescence fait événement. La demande des adolescents rencontre l’offre protocolaire de soins. Les modalités de ce « coming out » mobilisent la parentalité sur un mode nouveau. Quel rôle y joue la narrativité ? Quels fantasmes y sont associés ? Entre auto-assignation et fantasme d’auto-engendrement, la mise en jeu du fantasme d’androgynie est questionnée.
Complexe fraternel et dissymétrie. Emmy von N…
Authors: Orasanu Brindusa
Published: October 2023

Dans la théorie et la clinique psychanalytiques, la figure fraternelle et le transfert fraternel semblent être rarement abordés, et lorsqu’ils sont remarqués, ils semblent être considérés plutôt comme des défenses contre les transferts parentaux. L’hypothèse de l’auteure est que la transmission de cet évitement le long de l’histoire de la psychanalyse a sa source dans le fait que Freud a découvert la règle de l’association libre pendant qu’il traitait Emmy von N…, patiente qui venait avec un fantasme fraternel d’allure traumatique. Ainsi, le germe même de la dissymétrie de l’association libre dans la méthode psychanalytique pourrait être imprégné d’un tel fantasme fraternel, ensemble avec l’évitement, chez l’analyste, d’une régression vers le traitement « préhistorique » par l’intermédiaire de la suggestion.
La problématique narcissique : la vision d’André Green
Authors: Hebbrecht Marc
Published: October 2023

Selon Green, la problématique du patient narcissique pourrait être décrit en ces termes : il craint de nouer une relation de dépendance, car pour lui entretenir des contacts est traumatisant en raison de l’imprévisibilité et l’altérité de l’objet qui peut occasionner une douleur psychique insupportable. La solution narcissique est donc de renoncer à avoir une relation avec un objet externe et concentrer tout son amour sur le Moi : soit on opte pour l’autosatisfaction orgueilleuse qui rejette l’autre (le narcissisme de vie), soit on opte pour la tranquillité et le zéro (le narcissisme de mort). Grâce à son œuvre, on comprend mieux ce qu’est le désespoir, la dépression chronique, les sentiments de vide et la désertification psychique. Le narcissisme négatif mène fréquemment à une désillusion grave pour le patient et pour l’analyste. Les hypothèses de Green sont illustrées par une vignette clinique de l’auteur.
La dépression : perte de l’objet, perte du fantasme et sortie
Authors: Rizet Clément
Published: October 2023

Dans cet article, il s’agit de reprendre ce qu’il en est d’une définition de la dépression au sens psychanalytique : à la fois arrêt critique dans un état pathologique, position psychique et relance du travail psychique. À partir de la notion de désespoir chez Kierkegaard, de l’ambiguë dépressivité, entre mélancolie et hystérie, d’Emma Bovary et de la question du travail de deuil chez Freud, sera évoquée la question de l’anesthésie conservatoire de l’objet dans l’état déprimé d’après Fédida. Une courte vignette clinique et une plus longue illustreront la perte du fantasme et le dégagement du marasme dépressif chez une patiente endeuillée de longue date par une perte traumatique.
Alice , le corps, le temps, Ferrari et Matte Blanco
Authors: Romano Fausta , Sanchez-Cardenas Michel
Published: October 2023

Les aventures d’Alice au pays des merveilles représentent les vicissitudes psychiques du passage adolescent. Un rappel succinct des travaux d’Armando Ferrari et d’Ignacio Matte Blanco est effectué. Grâce au premier, on comprend comment Alice réagit aux changements que lui impose son corps, à ses nouvelles perceptions et sensations. Grâce au second on saisit pourquoi le sens du temps (dont l’évolution du corps est le témoin même) est distordu chez Alice.
Comment rester analyste face au chaos ?
Authors: Delgouffre Jeannine
Published: October 2023

L’auteure s’interroge sur le bien-fondé des séances virtuelles proposées à l’enfant suite au confinement imposé par la crise. Ce changement de cadre bouleverse les rapports entre l’enfant, ses parents et l’analyste. C’est à l’analyse de ces modifications que l’auteure s’est attachée afin d’évaluer la pertinence de cette forme de suivi.
The Allen-Cahn equation with a time Caputo-Hadamard derivative: Mathematical and Numerical Analysis
Authors: Wang Zhen , Sun Luhan
Published: October 2023

In this paper, we investigate the local discontinuous Galerkin (LDG) finite element method for the fractional Allen-Cahn equation with Caputo-Hadamard derivative in the time domain. First, the regularity of the solution is analyzed, and the results indicate that the solution of this equation generally possesses initial weak regularity in the time dimension. Due to this property, a logarithmic nonuniform L1 scheme is adopted to approximate the Caputo-Hadamard derivative, while the LDG method is used for spatial discretization. The stability and convergence of this fully discrete scheme are proven using a discrete fractional Gronwall inequality. Numerical examples demonstrate the effectiveness of this method.
Contribución al conocimiento de los híbridos naturales de los géneros Aeonium y Greenovia (crassulaceae) en La Gomera, Islas Canarias
Authors: Arango Octavio
Published: October 2023

Como parte del estudio fitocorológico y eco-biológico realizado en La Gomera con las nueve especies, dos subespecies y dos variedades que componen los géneros Aeonium y Greenovia, fueron descubiertos siete híbridos nuevos, que se suman a los 10 híbridos anteriormente descritos por otros autores en la isla. Se aportan las descripciones botánicas completas en cinco de los nuevos híbridos descubiertos, y en los dos restantes, puesto que solo conocemos la parte vegetativa, se dan a conocer algunos datos corológicos, morfológicos y taxonómicos, y se ilustran fotográficamente las plantas. Se hace el diagnóstico diferencial de los nuevos híbridos con otros nototaxones descritos anteriormente en la isla, especialmente con los que compartían alguno de los parentales. Los tipos nomenclaturales fueron depositados en los herbarios canarios LPA y TFC.
Creación de un parque urbano Nuevo índice ASD con un coeficiente de distribución espacial (Estudio de caso: región 1 de Teherán)
Authors: Salehabadi Amir Mohammad , Ghoddusifar Seyed Hadi , Mohammadpor Ali
Published: October 2023

The literature study demonstrates how GIS uses techniques like network analysis and fuzzy logic to carry out analyses in accordance with spatial balance. The aforementioned analytical techniques are technically difficult and costly since they need a large database. This study aims to measure geographical disparity, which indicates the lack of access to park services, identify circumstances where population demand is the main driver of demand, and identify general causes for the lack of service. The results of the GIS study suggest that the warning range is displayed in the parks with new­ ASD index of -25> new ASD> 170, while the range is displayed in the parks with a new ASD index of 2000> new ASD>74250. It also demonstrates how adverse the supply and demand scenario is for parks with tiny areas and close proximity to one another. This is because smaller parks have less ability to draw visitors from far away.
Herramienta para la identificación y análisis de revistas depredadoras en ciencias biomédicas
Authors: Álvarez-Vizcaino Manuel , Climent Piqueras Beatriz
Published: October 2023

Objetivo: Describir una herramienta creada desde las bibliotecas para identificar y analizar revistas depredadoras en el ámbito biomédico. Método: Se incorporan revistas potencialmente depredadoras en biomedicina, identificadas a partir de listas negras y bibliografía. De cada revista se analizan su inclusión en listas blancas, su adhesión a las asociaciones de editores, y otros datos útiles para el estudio. Resultados: Se observa un número menor de revistas presentes en las listas blancas y mayor en los directorios. El criterio más cumplido es el de adhesión a las asociaciones de editores. Discusión: Se propone una ponderación y un distinto nivel de vigilancia para las revistas. Se discute el valor de la etiqueta de depredadora cuando las fuentes no se actualizan. Conclusiones: La herramienta funciona como directorio de revistas sospechosas en biomedicina y como fuente de datos para el análisis de estas revistas. Su valor depende de su actualización.
The Impact of Customer Relationship Marketing on Customer Loyalty
Authors: Zegullaj Florinda , Zeqiri Jusuf , Reshidi Nail , Abazi-Alili Hyrije
Published: October 2023

This study aims to examine the impact of CRM on customer loyalty and to explore relationship marketing accuracy in four dimensions such as trust, communication, commitment, and conflict handling in the banking system. Moreover, it examines the direct and indirect relationships between CRM variables and the mediating role of trust between them. Because most bank-customer interactions are time-varying and dynamic, and there are only a few studies related to CRM in the Albanian banking system, this study tends to contribute further to this field. Random sampling technique was used to collect data from 440 bank customers, who completed a structured questionnaire in Google Forms. Structural equation modelling (SEM) in Smart PLS 4 software was used to analyse the completed questionnaires. The results have revealed that CRM impacts positively and significantly the loyalty of bank customers, thereby supporting all the hypotheses. Moreover, the data analysis showed that trust plays a mediating effect between CRM variables.
Cybersecurity and Social Media Networks for Donations
Authors: Lawson-body Assion , Jackson Jeremy , Hinsz Verlin , Illia Abdou , Lawson-body Laurence
Published: October 2023

Previous studies have focused on the impact of the theory of reasoned action (TRA)'s components on the behavioral intention to donate more. However, whether the mediation roles of social media-presence and cybersecurity affect this impact is unclear. This paper extends the TRA with trust, commitment, and loyalty to explore the integration of cybersecurity and social media-presence into the behavioral intention to donate more. Data were collected from 315 donors to nonprofit organizations and analyzed using partial least squared (PLS) methods. The results indicate that social media-presence positively influences the donor commitment towards the behavioral intention to donate more. However, social media-presence does not increase donor trust and loyalty toward the behavioral intention to donate more. Furthermore, cybersecurity increases donor trust and loyalty toward the behavioral intention to donate more. However, cybersecurity does not influence donor commitment toward the behavioral intention to donate more. Theoretical and practical contributions are offered.
Terahertz Optical Properties of Graphite-Cement Paste
Authors: Castro Joshua Libre , Nagal Danell Jeune C. , Jusi Arvin Lester C. , Madlangbayan Marish , De Los Reyes Alexander E. , Tapia Alvin Karlo Garcia
Published: October 2023

Mixing conducting particles in cement present various applications in electromagnetic shielding and in-situ inspection of structures. In this study, graphite was incorporated in cement paste at varying concentrations which enhanced its EM shielding. The samples were characterized using Terahertz Time-Domain Spectroscopy (THz-TDS) to determine its optical properties and calculate for the conductivity. The Ultraviolet-Visible (UV-Vis) spectroscopy was also used to characterize the sample to confirm the variation of graphite content which showed small peaks at 258 nm caused by the excitation of π electrons in the graphitic structure. The refractive index, absorption coefficient and conductivities were determined from the amplitudes and phase difference obtained in the frequency domain. The spectral cut-off in the THz region decreases with increasing graphite content due to THz absorption of graphite. The THz refractive index appeared to be not frequency-independent while the absorption coefficient showed a power-law behavior. The THz conductivities were calculated and was found to be proportional to the graphite content. This is attributed to an increase in the conducting network of cement paste and increase in the charge carriers in the insulating cement matrix.
Analysis of the Behavior of Different Steel Alloys Subjected to Uniaxial Mechanical Fully Reversed Fatigue Tests
Authors: Brnic Josip , Brcic Marino , Krscanski Sanjin
Published: October 2023

The favorable choice of material for structural elements for a specific purpose of use depends on the properties of the material that define its behavior in given conditions. Considering the possibility of the appearance of different types of mechanical failures during work under defined conditions, this paper deals with research on the behavior of materials subjected to uniaxial mechanical fully reversed fatigue tests at room temperature in an air atmosphere. The research refers to structural steel (S235JRC+C /1.0122), alloyed carbon steel (18CrNi8/1.5920) and chromium martensitic stainless steel (X46Cr13/1.4034). The tests were performed in an air atmosphere at room temperature, and the test results are presented in the form of a stress-life (S-N) diagrams. The fatigue (endurance) limit (/MPa) obtained for each of the tested materials subjected to a mechanical fully reversed fatigue test, (R = - 1), at room temperature, is as follows (material / fatigue limit): 1.0122/202; 1.5920/285; 1.4034/325. In addition, at room temperature, the parameters such as ultimate tensile strength and yield strength, as well as the level of Charpy impact energy, were determined.
Analysis of the Effect of Slenderness Ratio on Nominal Moment in T Section
Authors: Chang Ting Hsiang , Chung Hsiao Chi , Ho Kun Ze , Hsu Wei Ting
Published: October 2023

T-section is similar to the single-symmetry plane. Mostly used in railway engineering, temporary work stands and machinery equipment. In the AISC1999 specification, due to the unfamiliarity with the T-section. Therefore, a conservative definition of a tee fracture is a noncompact section. With the evolution of the times, there are more and more researches on T-section. The T-section is defined as the flange slenderness and the web slenderness. The calculation formula of the nominal moment (Mn) is mainly limited by the slenderness ratio. In recent years, the AISC2017 has added limiting laterally unbraced length for the limit state of yielding (Lp) and limiting laterally unbraced length for the limit state of inelastic lateral-torsional buckling (Lr) to the calculation formula of the nominal flexural strength (Mn) of the T-section. The nominal flexural strength (Mn) shall be the lowest value obtained according to the limit states of yielding moment (Mp), lateral-torsional buckling (LTB). Therefore, this study will analyze and compare the changes in the AISC2017 with the previous norm. Largest laterally unbraced length along either flange at the point of load has 3% difference between AISC2017 and other specifications in plastic moment.
Effects of Holding Time and Temperature of Creasing Knife on Crease Bending Characteristics of Milk Carton Subjected to Indentation of Flat-Edge Creasing Knife
Authors: Nagasawa Shigeru , Nagumo Takaomi
Published: October 2023

Since the material properties of paperboard depend on the processing strain rate and the temperature elevation of the paperboard, the mechanical conditions of the scoring tool (creasing knife) are important for precisely and stably folding the scored zone of the paperboard. When the temperature and the indentation velocity of the creasing knife are changed irregularly during the scoring process, the permanent-indented (residually scored) depth of the paperboard seems to be affected by the temperature and the indentation time of the creasing knife. Although the temperature-dependent and time-dependent behavior of several thin paperboards have been known in the past, their combined behavior was not sufficiently discussed regarding the crease bending characteristics of the paperboard. In this work, the time-dependent and temperature-dependent scoring, and the corresponded bending characteristics of liquid-container-purpose paperboard of basis weight 313g/m2 (thickness of t = 0.47mm) were experimentally investigated using a bending (folding) tester, when varying the holding time and the temperature of a flat-edge creasing knife at two levels of the normalized indentation depth d/t = 0.68 and 1.02. As the results, the first peak bending moment Mp1, the first stiffness C1 (the gradient of bending moment resistance by the folding angle at an angle of 0—4 degrees), and the rating bending moment resistance at the right-angle M90,1(0) were characterized with the holding time and the temperature elevation of the creasing knife at the pre-stage (scoring) process. Also, some explicit expressions of C1, Mp1, M90,1(0) with the permanent scored depth were revealed as a static relationship. It is concluded that the temperature variation and the holding time of the creasing knife are important parameters which must be controlled in the manufacturing process of liquid package.
Experimental Study on the Effect of Process Parameters on the Build Time and Part Accuracy of Direct Metal Laser Sintering Components
Authors: Nancharaiah Tata , Reddy V. Sudheer Kumar , Chakravarthi T. , Chowdary G. Tarun Sai , Teja Y. Brahma
Published: October 2023

3D printing is an emerging technology that creates parts straight from CAD models. Direct Metal Laser Sintering (DMLS) is a 3D printing method that is becoming increasingly popular in the aerospace, medical, and orthopedics sectors. These are usually focused on precise, long-lasting, and lightweight parts. DMLS is an Additive Manufacturing (AM) technique that employs a laser to sinter a selected area of a metallic powder layer by layer to produce the required metal components. The heating power of the laser was discovered to have a strong effect on phase formation. The major issue with this process is that high residual and large deformations are introduced to the components during manufacturing. This causes a change in the fatigue strength of a part and can even lead to cracks. The quality of the DMLS parts is affected by various process parameters. In this study, the design of experiments is used to investigate the consequences of process parameters used in the DMLS process to make metal parts. Process parameters such as laser power and scanning speed must be identified because they have the largest influence on the part's characteristics. (Build time, part accuracy). The change in the controlling parameters, or process parameters, in the DMLS method, has been found to affect material properties, according to a literature review. Thus, in the proposed work, three process parameters laser speed, scanning speed, and hatching distance are taken into account at two distinct levels. L4 orthogonal arrays are used in the studies. Experimental research is done on the manufacturing process, build time and component accuracy. Finally, the impact of each parameter on the quality aspects is discussed based on the experimental findings.
Air Preheater Performance Analysis: Installation of Soft Seal Material to Improve Air Preheater Leakage
Authors: Monsanto Franz Josef A. , Tayactac Reylina Garcia
Published: October 2023

Air preheaters are used in thermal power plants to preheat combustion air before it enters the furnace by recovering and using waste heat from the flue gas that is supposed to be exhausted at the stack to reduce the work needed by the furnace to combust fuel and improve the boiler efficiency. Air preheater leakage is the bypassing of the cooler ambient air into the flue gas side, reducing the temperature needed to heat the heating elements which transfers the heat into the air side. This negatively impacts the heat transfer effectiveness of the air preheater and the overall thermal efficiency of the plant. This paper aims to review the effectiveness of the soft touch seals applied in a Ljungstrom Type Regenerative Air Preheater installed in a 455 MW (net) Coal-Fired Thermal Power Plant situated in Mauban, Quezon Province in the Philippines in reducing the air preheater leakage through calculations and analysis in compliance with the ASME Performance Test Code to ensure accuracy and repeatability.
Increasing the Efficiency of Extinguishing Fires in a Pressurized Space due to the Adhesive Properties of Gel-Forming Fire Extinguishing Compounds
Authors: Ostapov Konstantin , Senchykhin Yurii , Avetisian Vadym , Kirichenko Igor
Published: October 2023

For operational extinguishing of fire-hazardous equipment under a subway car, a modernized under-weight extinguishing trolley is proposed. For supplying components of gel-forming compositions Na2O·2,7SiO2 + NH4H2PO4 sprayers of the "segener wheel" type were used. This made it possible to create a finely dispersed fog of gel-forming compounds under the subway car, ensuring uniform and stable adhesion of the gel layers to all surfaces under the car. When conducting experimental studies on the extinguishing of model fires, which are close in their configuration to a sub-weighted space, the effective parameters of the dispersion of drops of gel-forming compositions in 1,6 mm were determined. Uniformly stable adhesion of gel-forming compositions when finely dispersed allowed to reduce the consumption of fire extinguishing agent by at least 25% compared to previously used technical solutions.
Numerical and Experimental Study for Al4043A Aluminium-Silicium Alloy Fabricated by Wire Arc Additive Manufacturing under Dynamic Tests
Authors: Galatanu Sergiu Valentin , Duma Iuliana , Popa Cosmin Florin , Murariu Alin Constantin , Perianu Ion Aurel , Marsavina Liviu
Published: October 2023

The paper presents an experimental investigation of the impact properties and imperfections of the 3D printed Al4043A aluminium-silicium alloy using wire-arc additive manufacturing. Using an experimental program based on factorial experiments, correlations between the main WAAM process parameters and the related properties of the deposition were determined. Charpy impact strength investigations, using standard notched specimens, were performed on an Instron CEAST 9050 instrumented Charpy impact pendulum system following the ISO 148-1 standard. During the experimental tests, the brittle behaviour of the specimens could be observed. After the experimental tests, the impact behaviour was numerically analysed, showing a relatively good correlation between the results.
Durability Performance of Reinforced Concrete-Based Fly Ash Exposed to Combined Chloride-Sulfate Attack
Authors: Ejbouh Aadil , Ech-chebab Adil , Hassi Sara , Galai Mouhsine , Benqlilou Hanane , Ebn Touhami Mohamed
Published: October 2023

This study investigates the durability performance of local fly ash as a supplementary cementitious material (SCM) in reinforced concrete. In this paper the effect of the fly ash on the durability of reinforced concrete under combined chloride-sulfate penetration has been investigated. Two mixes made by tow formulations: a control mix made of ordinary cement OPC (M1) and a mix substituted with 17% of fly ash (M2) exposed to combined chloride-sulfate attack. The durability performances of these concrete mini pipes were experimentally investigated and evaluated by electrochemical impedance spectroscopy (EIS). The results indicate that the concrete pipe substituted with fly ash shows a high mechanical polarisation resistance compared to the traditional concrete pipe. Moreover, the EDS analysis and visual inspection confirm the results found by the electrochemical measurements. Ultimately, the fly ash as a SCM could improve the service life of reinforced concrete pipe in combined chloride-sulfate attack.
Towards Systematization of Aurivillius Phases' Formula
Authors: Mouzai Meriem , Oukid Saliha
Published: October 2023

Aurivillius structures are a family of layered perovskite that are of great importance due to the many properties they provide (ferroelectricity, dielectric ...) and the applications in which they can be used (thin films, micro-electromechanical devices, etc.); thus, the discovery of such materials can be very useful. Since their appearance, Aurivillius structures have been largely studied, but little work has focused on the systematization of the latter. The main idea of this paper is to systematize the formula of Aurivillius structures [Am-1 B­i2 Bm O3m+3], using combinatorial mathematical techniques to substitute elements in cations A and B, while taking into account the criteria of electronegativity (zero total charge) and structure (tolerance factor). Constraint propagation has been used as a key technique to significantly reduce the number of combinations and thus minimize the execution cost. The results of such a work can present a very large dataset which can be exploited into a research tool that brings a great help to researchers by providing a better visibility on chemical elements forming a potential Aurivillius structure, and thus, bringing a significant asset in the discovery of these materials.
Compressive Behavior of Various BCC Lattice Structure
Authors: Timpea Stefan Adrian , Codrean Cosmin , Sîrbu Nicuşor Alin , Dume Adrian Ilie , Cosma Cristian , Serban Viorel Aurel
Published: October 2023

The lattice structures are a particular type of structures made by the multiply of a unit cell. In addition, their structure is close to some physiological tissues and bone structure, which can allow their use to develop prostheses needed to the rehabilitation or replacement of a body part. Lattice structures are widely used in various engineering applications due to their high weight-to-strength ratio and exceptional energy absorbing performance. The feasibility of using different base materials to fabricate these cellular structures with complex geometries has been significantly widen with the development of additive manufacturing (AM) technology. Additive manufacturing in particular metal selective laser melting (SLM) processes are rapidly being industrialized. In this work, samples with different lattice structures were manufactured by SLM technique using CoCr powder alloy. Compression tests were carried out to characterize their mechanical behavior. Starting from a BCC lattice cell measuring 5x5x5mm and 1mm diameter of the strut, were designed using Catia V5 R19 software. The BCC lattice unit cell consists of 4 solid struts with circular cross-section by which they intersected at 45°angle and modify by adding radius at the intersection of all four struts, furthermore the empty space is filled with BCC cell to increase the stiffens of the structure. The BCC cell was duplicate in three directions (X, Y, Z) measuring 20mm in each direction. To obtain the final part the BCC structure ware intersected with a cylindrical part measuring 20mm in Z direction, 15mm diameter and 1mm wall thickness, resulting a cylindrical part with three different BCC lattice structure inside.
Laser Doppler in Green Compact Density Inspection of Powder Metallurgy
Authors: Yuan Wang , Yung Wang Po , Ju Huang Yun , Hung Yang Kang , Kuei Chiu Sheng , Yi Chen Chin
Published: October 2023

The density of green compact in powder metallurgy (PM) is a critical characteristic to determine the strength and tenacity of the product. Due to the fragility and sensitivity to the humidity of green compact, detection method triggers by knocking or immersion cannot be applied. Current inspection method for green compact is to use a densitometer with Archimedes Principle, which has to immerse green compact into water. This action considers a destructive test due to the porosity of the PM product, and the oxidation reaction of metal particles inside products cannot be controlled. Since the current detection method is destructive, most of the inspection on forming process of PM only complies after setup of compaction machine. The next non-destructive test is executed after sintering, such as Acoustic emission testing (AE) and Magnetic Testing (MT), which require a solid object for knocking or liquid immersion. To reduce defective compaction flow into the manufacturing process, a Non-destructive test in forming process is a prerequisite. Laser Doppler Vibrometer (LDV) takes advantage of measuring without damaging the test object and obtaining characteristic spectrum signal from the sample for further analysis, which is preferable for green compact of PM. The LDV test setup included a Polytec PSV-400 scanning laser vibrometer with a crystal resonator attached to the test product to generate reference vibration. Integrate spectrum in the frequency range 0 - 5000 Hz was recorded from 30 points of an annular pattern. Comparison of the spectrum and statistical analysis from defective specimens demonstrate that velocity increases within a specific frequency, which is different from with normal samples. Increases in velocity refer to uneven density distribution with an absence of particles inside product decline. The study approves the possibility of density detection in green compact using an LDV. Further studies aim to construct a relational model of specimen and compaction machine and determine a fundamental database for Advance Process Control (APC) of forming process in PM.