bluuebunny/crossref_metadata_2025 huggingface dataset:
Discovery of Transition from Marginally Stable Burning to Unstable Burning after a Superburst in Aql X-1
Authors: Li Zhaosheng , Pan Yuanyue , Falanga Maurizio
Published: October 2021

Superbursts are long duration, rare, and extremely energetic thermonuclear explosions of neutron star low-mass X-ray binaries (NS LMXBs), which are proposed to be due to unstable carbon ignition. We report the superburst properties and consequences from Aql X–1 observed by the Neutron Star Interior Composition Explorer (NICER), the Monitor of All-sky X-ray Image, Swift, and Insight Hard X-ray Modulation Telescope (Insight-HXMT) on the MJD 59130.7. We found two faint type I X-ray bursts 9.44 days after the superburst with a short recurrence time of 7.6 minutes, which is the most accurate measurement of the quenching time in all NS LMXBs with observed superbursts. We also discovered mHz quasi-periodic oscillations in the frequency range 2.7–11.3 mHz immediately after the superburst, before and after the resumption of the first type I X-ray burst from NICER, Swift, and Insight-HXMT observations. For the first time, we observed the transition from superburst, via marginally stable burning to unstable burning in NS LMXBs. We compared the quenching time and the recurrence time of type I X-ray bursts with simulations.
A New Catalog of Asymptotic Giant Branch Stars in Our Galaxy
Authors: Suh Kyung-Won
Published: October 2021

We present a new catalog of 11,209 O-rich asymptotic giant branch (AGB) stars and 7172 C-rich AGB stars in our Galaxy, identifying more AGB stars in the bulge component and considering more visual carbon stars. For each object, we cross-identify the Infrared Astronomical Satellite (IRAS), AKARI, Midcourse Space Experiment, Wide-field Infrared Survey Explorer (WISE), Two-Micron All-Sky Survey, and American Association of Variable Star Observers counterparts. We present the new catalog in two parts: one is based on the IRAS PSC for brighter or more isolated objects; the other one is based on the ALLWISE source catalog for less bright objects or objects in crowded regions. We present various infrared two-color diagrams (2CDs) for the sample stars. We find that the theoretical dust shell models can roughly explain the observations of AGB stars on the various IR 2CDs. We investigate IR properties of SiO and OH maser emission sources in the catalog. For Mira variables in the sample stars, we find that the IR colors get redder for longer pulsation periods. We also study infrared variability of the sample stars using the WISE photometric data in the last 12 yr: the ALLWISE multiepoch data and the Near-Earth Object WISE Reactivation 2021 data release. We generate light curves using the WISE data at W1 and W2 bands and compute the Lomb–Scargle periodograms for all of the sample stars. From the WISE light curves, we have found useful variation parameters for 3710 objects in the catalog, for which periods were either known or unknown in previous works.
Galaxy Rotation Curves Disfavor Traditional and Self-interacting Dark Matter Halos, Preferring a Disk Component or Einasto Function
Authors: Loizeau Nicolas , Farrar Glennys R.
Published: October 2021

We use the galaxy rotation curves in the SPARC database to compare nine different dark matter (DM) and modified gravity models on an equal footing, paying special attention to the stellar mass-to-light ratios. We compare three noninteracting DM models: a self-interacting DM model, two hadronically interacting DM models, and three modified Newtonian dynamics type models, modified Newtonian dynamics (MOND), a radial acceleration relation, and a maximal-disk model. The models with DM–gas interactions generate a disky component in the DM, which significantly improves the fits to the rotation curves compared to all other models except an Einasto halo; the MOND-type models give significantly worse fits.
When Hot Meets Cold: Post-flare Coronal Rain
Authors: Ruan Wenzhi , Zhou Yuhao , Keppens Rony
Published: October 2021

Most solar flares demonstrate a prolonged, hour-long post-flare (or gradual) phase, characterized by arcade-like, post-flare loops (PFLs) visible in many extreme ultraviolet (EUV) passbands. These coronal loops are filled with hot (∼30 MK) and dense plasma that evaporated from the chromosphere during the impulsive phase of the flare, and they very gradually recover to normal coronal density and temperature conditions. During this gradual cooling down to ∼1 MK regimes, much cooler (∼0.01 MK) and denser coronal rain is frequently observed inside PFLs. Understanding PFL dynamics in this long-duration, gradual phase is crucial to the entire corona–chromosphere mass and energy cycle. Here we report a simulation in which a solar flare evolves from pre-flare, over the impulsive phase all the way into its gradual phase, which successfully reproduces post-flare coronal rain. This rain results from catastrophic cooling caused by thermal instability, and we analyze the entire mass and energy budget evolution driving this sudden condensation phenomenon. We find that the runaway cooling and rain formation also induces the appearance of dark post-flare loop systems, as observed in EUV channels. We confirm and augment earlier observational findings, suggesting that thermal conduction and radiative losses alternately dominate the cooling of PFLs.
Formation of the First Two Black Hole–Neutron Star Mergers (GW200115 and GW200105) from Isolated Binary Evolution
Authors: Broekgaarden Floor S. , Berger Edo
Published: October 2021

In this work we study the formation of the first two black hole–neutron star (BHNS) mergers detected in gravitational waves (GW200115 and GW200105) from massive stars in wide isolated binary systems—the isolated binary evolution channel. We use 560 BHNS binary population synthesis model realizations and show that the system properties (chirp mass, component masses, and mass ratios) of both GW200115 and GW200105 match predictions from the isolated binary evolution channel. We also show that most model realizations can account for the local BHNS merger rate densities inferred by LIGO–Virgo. However, to simultaneously also match the inferred local merger rate densities for BHBH and NSNS systems we find we need models with moderate kick velocities (σ ≲ 102 km s−1) or high common-envelope efficiencies (α
CE ≳ 2) within our model explorations. We conclude that the first two observed BHNS mergers can be explained from the isolated binary evolution channel for reasonable model realizations.
Spiritual Care Need: The Pediatric Nurses’ Perspective
Authors: Romdzati Romdzati , Yuliandari Widya Rachmi
Published: October 2021

BACKGROUND: Nurses as health professionals have to provide holistic nursing care that is a bio-psycho-socio-cultural and spiritual aspect. If the spiritual aspects are not met, it will impact the patient’s healing process. It requires the role of nurses to meet the spiritual needs of patients.
AIM: This study aims to determine a spiritual care need based on pediatric nurses’ perspective.
METHODS: This study used a qualitative method of phenomenology. Participants in this study were all seven nurses working in the pediatric inpatient ward of three private hospitals in Yogyakarta. Data were collected through semi-structured interviews.
RESULTS: The study showed that the meaning of spiritual care need was the need related to pediatric religion and psychology. Nurses can perform spiritual care needs to patients independently or collaborate with the spiritual counselor. Nurses fulfilled patients’ spiritual care needs to remind daily prayer, pray for patients, and remind them of prayer before taking medicine or other occasions.
CONCLUSION: Spiritual care needs can be fulfilled by nurses independently or through collaboration with a spiritual counselor.
Morphological, calorific and nutritive characteristics of 656 freshwater invertebrates taxa
Authors: Moreau Axelle , Dupuy Christine , Bocher Pierrick , Farau Sébastien
Published: October 2021

The Freshwater Animal Diversity Assessment (FADA) project estimated that freshwater animal species represent 9.5% of the 1.2 million species described. Knowing that freshwater represents only 0.01% of the earth's surface, these wetlands are suitable habitats for a great part of the world's total biodiversity. However, it has been shown that there is a lack of knowledge on these species, including freshwater invertebrates. Nevertheless, they play a key role in the majority of freshwater ecosystems and in their foodweb networks. Freshwater invertebrates are the food resource of many species, such as fish and birds. The knowledge of their morphological, energetic and nutritive characteristics allows a better understanding of their selection by predators (size, energy intake etc.), but also leads to the improvement of wetland management. Although information about freshwater invertebrates exists in literature, they are generally heterogeneous, dispersed and difficult to collect. To facilitate the accessibility of these data and, thus, optimise and accelerate research projects including freshwater invertebrates, we propose a literature review describing 14 morphological and nutritive characteristics (size, dry weight, gross energy, crude protein etc.) for 656 taxa of freshwater invertebrates.

This dataset is a review from 104 publications from 1935 to 2020, compiling 14 characteristics when available (size, dry weight, gross energy, crude protein etc.) for 656 taxa of freshwater invertebrates.
Preclinical safety evaluation of drone brood homogenate and justification of pharmacological action
Authors: Pavliuk Bohdana , Stechyshyn Iryna , Chubka Mariana , Hroshovyi Taras
Published: October 2021

The problem of studying the metabolic syndrome, as well as its integration into other pathological processes, despite large-scale research, remains relevant. The complexity of the interaction of different links in pathogenesis requires scientists to find new tools and methods for both diagnosis and treatment. Drone brood homogenate, which is a multifactorial pharmacological agent in terms of chemical composition, seems to be promising to study for today. And the lack of contraindications and a wide age range makes it an excellent object of research. The current study evaluated the pharmacological aspects of safety: acute toxicity, effects on the functional and motor activity of the gastrointestinal tract, as well as local irritation of the gastric mucosa, the secretory function of the stomach. All experiments were performed according to the classical methods. The specific pharmacological activity of the drone brood homogenate was determined in comparison with metformin in the experimental fructose metabolic syndrome. Animals obtained from the Vivarium of I.Horbachevsky Ternopil National Medical University were used to implement the set goals. Working with animals was met all bioethical requirements. The study found that the lyophilized drone brood homogenate does not have a local irritant effect and does not cause ulcers on the surface of the gastric mucosa, does not affect the secretory function of the stomach and motor-evacuatory activity of the gastrointestinal tract and is a low-toxic substance, indicating the possibility of its long-term safe use. As expected, glucose, insulin, and HOMA index were significantly increased in animals that were simulated metabolic syndrome. The use of drone brood homogenate by animals contributed to a relatively positive effect on selected indicators of the metabolic syndrome. Accordingly, drone brood homogenate is a promising active pharmaceutical ingredient for the normalization of biochemical disorders in metabolic syndrome.
Euphorbia mbuinzauensis, a new succulent species in Kenya from the Synadenium group in Euphorbia sect. Monadenium (Euphorbiaceae)
Authors: Wei Neng , Mutie Fredrick Munyao , Mwachala Geoffrey , Grace Olwen M. , Hu Guang-Wan , Wang Qing-Feng
Published: October 2021

Euphorbia mbuinzauensis, a succulent new species of theSynadeniumgroup in Euphorbiaceae from Makueni County, Kenya, is described and illustrated. Morphologically, it is most similar toE. pseudomollis, but differs mainly by its shrubby habit (up to 4 m), abaxial leaves surfaces with densely stellate hairs, 2–4-forked cymes, smaller bracts (ca. 2.5 × 3.0 mm), smaller cyathia (6 mm wide), crimson glands without narrow smooth margin, smaller fruits (ca. 8 × 7 mm) and ovoid seeds (ca. 1.8 × 2.2 mm). Furthermore, we performed a molecular phylogenetic analysis of theSynadeniumgroup in Euphorbia sect. Monadenium, based on complete nuclear ribosomal DNA (nrDNA) datasets. This phylogenetic inference also supports it to be a distinct species. The new species is assessed as Endangered using the IUCN criteria.
Âges de la vie, esthétique et arts
Authors: Schaeffer Jean-Marie
Published: October 2021

L’article se propose de clarifier les deux notions mises en relation dans l’expression « Les arts et les âges de la vie ». Il expose d’abord les différents systèmes des âges développés au fil de l’histoire européenne et les compare à deux autres classifications des parcours de vie : les classes d’âge et le cycle biologique. La seconde partie insiste sur la distinction entre art et esthétique avant d’explorer différentes manières selon lesquelles la question des âges de la vie peut nous aider à mieux comprendre la création artistique et la réception esthétique.
Le grand âge de la littérature
Authors: Roussin Philippe
Published: October 2021

La littérature occidentale a longtemps représenté la vieillesse masculine selon deux grands types de caractère, opposés et complémentaires : l’homme devenu sage (dans l’épopée) et l’homme ridicule (dans la comédie). Au seuil de la modernité, Shakespeare a inventé un nouveau type de vieillard, au-delà du sage et du comique, un personnage de démesure, déchu de ses pouvoirs, grandiose et atteint de folie. Le Roi Lear (1605-1606) est la première œuvre dont le héros est un vieillard. Lear invente, pour ainsi dire, le temps littéraire de la vieillesse. L’article analyse trois œuvres du siècle passé où une grande place est accordée au personnage du vieillard, celles d’Italo Svevo, de Samuel Beckett et de Thomas Bernhard, les deux dernières entretenant des liens étroits avec le drame shakespearien et Le Roi Lear . Il se conclut par quelques remarques sur les rapports entre âge et création, grand âge et style tardif.
Débuts et fins de vie sur les scènes de Romeo Castellucci
Authors: Jernite Kenza
Published: October 2021

Les scènes de Romeo Castellucci abondent en corps hors normes. Parmi eux, les corps d’enfants et les corps de vieillards, que l’on retrouve en particulier dans les spectacles de Castellucci interrogeant le texte biblique et l’histoire chrétienne. Nous nous demandons en quoi ces corps, intégrés à ses compositions théâtrales, permettent à Castellucci de faire retour à ce qui l’obsède : la création d’images jamais vues, violemment incarnées, et qui par leur teneur de scandale attrapent les spectateurs aux entrailles, les obligeant à faire retour sur ce qui est d’habitude collectivement refoulé.
La longue enfance du cinéphile
Authors: Cerisuelo Marc
Published: October 2021

La relation au cinéma commence dans l’enfance, âge de nombreuses découvertes qui deviendront bientôt des habitudes. Un tel lien doit moins sa force à la qualité supposée des œuvres, toujours relative, qu’au simple fait d’ aller au cinéma , expérience incommensurable à celle de voir un film . Le texte est une libre variation à partir de remarques sur ce sujet formulées dans La Projection du monde (1971-1979) par le philosophe Stanley Cavell ainsi que par Jean-Luc Godard dans Histoire(s) du cinéma (1988-1998). Son intention est avant tout d’apporter une contribution personnelle à une histoire collective des spectateurs de cinéma.
Liens entre éducation et cognition en fonction de l’évolution des concepts de recherche selon deux bases de données : Web of Science (WOS) et Didactique et acquisition du français (DAF)
Authors: Sprenger-Charolles Liliane
Published: October 2021

Cet article examine, d’une part, ce qui permet d’attester qu’une étude est scientifique et, d’autre part, à quelle époque ont émergé les recherches issues des domaines de l’éducation et de la cognition, à partir de l’examen de deux bases de données : DAF (Didactique et acquisition du français langue maternelle) et le WoS. DAF a été élaborée par des chercheurs francophones québécois (Université de Montréal), français (Institut national de recherche pédagogique), belges et suisses. Le WoS recense les articles publiés dans des revues à comité de lecture, principalement internationales. Pour répondre à la première question, la typologie des recherches élaborée pour DAF est examinée et confrontée à celle issue du WoS avec une dimension historique. Pour répondre à la seconde question, après la présentation de quand et comment ont émergé les sciences cognitives d’après un des fondateurs de cette discipline (George Miller), l’évolution de ce champ disciplinaire et de celui de l’éducation est examiné ainsi que les sous disciplines auxquelles ils sont respectivement rattachés. L’article se termine par l’examen d’un domaine dans lequel les imbrications entre sciences de la cognition et de l’éducation sont fortes (celui de l’apprentissage de la lecture) avec un état des lieux de la recherche dans ce domaine et un examen de ce qui semble être un frein à sa diffusion dans le monde des praticiens de l’éducation.
La présentation de malade, dispositif pour penser et transmettre la clinique en psychiatrie
Authors: Sacchelli Muriel
Published: October 2021

À l’approche prétendument objective qui envahit le champ psychiatrique, position évacuant le fait psychique au profit du comportement, opérant la forclusion du sujet de l’inconscient du discours de la science, le dispositif de présentation de malade, telle que la pratique en a été subvertie par Lacan, objecte résolument. Il contribue au maintien d’une ouverture aux dimensions évacuées par le discours dominant en faisant la part belle à la parole, de la narration du patient à celle qui s’échange entre analyste et auditoire à partir de son dire. Indispensable transmission en acte d’une clinique sous transfert qui contribue à soutenir voire réhabiliter la parole discréditée dans la postmodernité, sans quoi la psychiatrie deviendra de plus en plus ségrégative.
Mise en place d’une permanence d’accueil et d’écoute psy pour les personnes exilées en errance à Paris et en Île-de-France
Authors: Lenormand Adèle , Alauzy Paul , Barda Louis
Published: October 2021

Les exilés en errance sont nombreux en Île-de-France. À des conditions de vie très difficiles s’ajoute un état de santé physique et psychique très dégradé. Médecins du Monde leur propose un accueil, avec une permanence d’écoute psy.
Well-posedness in Sobolev spaces of the two-dimensional MHD boundary layer equations without viscosity
Authors: Li Wei-Xi , Xu Rui
Published: October 2021

We consider the two-dimensional MHD Boundary layer system without hydrodynamic viscosity, and establish the existence and uniqueness of solutions in Sobolev spaces under the assumption that the tangential component of magnetic fields dominates. This gives a complement to the previous works of Liu-Xie-Yang [Comm. Pure Appl. Math. 72 (2019)] and Liu-Wang-Xie-Yang [J. Funct. Anal. 279 (2020)], where the well-posedness theory was established for the MHD boundary layer systems with both viscosity and resistivity and with viscosity only, respectively. We use the pseudo-differential calculation, to overcome a new difficulty arising from the treatment of boundary integrals due to the absence of the diffusion property for the velocity.
Controllability to rest of the Gurtin-Pipkin model
Authors: Zhou Xiuxiang , Luan Shu
Published: October 2021

This paper is devoted to analyzing the controllability to rest of the Gurtin-Pipkin model, which is a class of differential equations with memory terms. The goal is not only to derive the state to vanish at some time but also to require the memory term to vanish at the same time, ensuring that the controlled system is controllable to rest. In order to get rid of the influence of memory, the controllability result is obtained by means of the Fourier type approach and the moment theory.
Modelling of the pedestal growth of silicon crystals
Authors: Surovovs Kirils , Kravtsov Anatoly , Virbulis Janis
Published: October 2021

The pedestal method is an alternative to the well-known floating zone method, both of which are performed with high-frequency electromagnetic heating. Unlike the floating zone method, in the pedestal method a single crystal is pulled upwards from the melt. It allows one to lower feed rod quality requirements and simplify the process control due to the absence of open melting front. As the pedestal method has not been widely used in industry for silicon crystals, its development requires extensive numerical modelling. The present work describes application of the previously created mathematical model for crystals with diameters higher than it is currently possible in the experimental setup, as well as for the cone growth phase. Supplementary free surface heating, that prevents melt centre freezing during the seeding phase, has been added at the beginning of cone phase. After multiple sets of simulations, an optimal scheme of heating control for cone growth was proposed.
La mort dans quelques qenē en amharique
Authors: Assefa Daniel
Published: October 2021

Ce travail présente vingt qenē, poésie en amharique à double sens, dont le texte original est accompagné d’une traduction annotée en français. Le thème de la mort y est présent, abordé de façon diverse. Issus d’un recueil établi par le blatēn gētā māḥtama Śellāsē en 1961, ces poèmes véhiculent mémoire collective et culture populaire. Ainsi, des événements collectifs traumatisants de l’histoire éthiopienne tout autant que les décès de personnages historiques importants y sont largement évoqués. Quelques poèmes présentent des allégories de la mort, tandis que d’autres s’attachent à exprimer les émotions ressenties durant un deuil.
Le site funéraire d’Antsiraka Boira (Acoua, Grande Terre) : Islamisation et syncrétisme culturel à Mayotte au XIIe siècle
Authors: Pauly Martial , Ferrandis Marine
Published: October 2021

Cet article présente un bilan des six campagnes de fouilles effectuées entre 2012 et 2017 sur le site archéologique d’Antsiraka Boira, à Acoua (nord-ouest de Mayotte, Grande Terre). Il s’agit d’un ensemble funéraire daté du xiie siècle. L’échantillonnage de cette étude se compose de 29 sépultures fouillées sur un ensemble de 69 tombes repérées dans la zone de fouilles.Nos recherches à Antsiraka Boira documentent les pratiques funéraires d’une population de pêcheurs/agriculteurs/éleveurs représentative de la population mahoraise du début du IIe millénaire. Les sépultures étudiées attestent de l’islamisation de cette population durant le xiie siècle mais également de la permanence de gestes funéraires étrangers à l’Islam (mobilier funéraire, cercueil en bois), témoignant, pour la première fois à Mayotte, d’une phase de syncrétisme islamique. La recherche des filiations culturelles de ces pratiques funéraires, encore conservées en filigrane malgré l’islamisation, apporte une contribution permettant d’appréhender les multiples influences culturelles présentes à Mayotte, et interroge sur les connexions entretenues par l’archipel des Comores avec l’ensemble régional proche (Afrique, Madagascar) et en particulier sur la question de l’existence d’une aire culturelle proto-malgache encore décelable au début du IIe millénaire.
Ramadan et « sauce à la souris ». Interdits et compromis alimentaires entre musulmans et animistes d’Afrique occidentale d’après le récit de René Caillié au début du XIXe siècle
Authors: Chastanet Monique
Published: October 2021

Au cours de son voyage à Tombouctou en 1827-1828, René Caillié s’intéresse au mode de vie des commerçants musulmans, ses compagnons de route, et des villageois animistes établis sur le trajet des caravanes. Il s’agit là d’une expérience exceptionnelle à bien des titres, même si ce témoignage doit faire l’objet d’une approche critique. René Caillié décrit notamment les pratiques alimentaires des uns et des autres, ou des uns avec les autres, selon leur appartenance religieuse. Ces comportements donnent une image contrastée des relations entre animistes et musulmans, qui peuvent être faites d’interdits, de tolérances ou de compromis de la part des commerçants « mandingues ». Ces pratiques montrent aussi diverses manières d’être musulman en Afrique soudano-sahélienne au début du XIXe siècle, en fonction des tendances pacifiques ou conquérantes de l’islam, des nécessités du commerce à longue distance, et de la prégnance de certaines habitudes locales.
Machine Learning Techniques for IoT-Based Indoor Tracking and Localization
Authors: Yildirim Taser Pelin , Akram Vahid Khalilpour
Published: October 2021

The GPS signals are not available inside the buildings; hence, indoor localization systems rely on indoor technologies such as Bluetooth, WiFi, and RFID. These signals are used for estimating the distance between a target and available reference points. By combining the estimated distances, the location of the target nodes is determined. The wide spreading of the internet and the exponential increase in small hardware diversity allow the creation of the internet of things (IoT)-based indoor localization systems. This chapter reviews the traditional and machine learning-based methods for IoT-based positioning systems. The traditional methods include various distance estimation and localization approaches; however, these approaches have some limitations. Because of the high prediction performance, machine learning algorithms are used for indoor localization problems in recent years. The chapter focuses on presenting an overview of the application of machine learning algorithms in indoor localization problems where the traditional methods remain incapable.
Populism in Robots
Authors: Zhang Emma Yann
Published: October 2021

Populism has rarely been discussed in the context of robotics. This chapter will explore how intimate relationships, such as love and sex, between human and robots, will bring populism to the populist masses. Intimacy between humans and robots was first raised and discussed by David Levy in his book titled Love and Sex with Robotics published in 2007. As a result, the subject of human-robot romantic and intimate relationships rapidly developed into an academic research discipline in its own right. Since then, researchers have come up with many implementations of robot companions like sex robots, emotional robots, humanoid robots, and artificial intelligent systems that can simulate human emotions. This chapter presents a summary of significant activity in this field during the recent years, predicts how the field is likely to develop, and its ethical and legal background. They also discuss their research in physical devices for human-robot love and sex communication.
Cybersecurity and Privacy in Smart Cities for Citizen Welfare
Authors: Figueiredo Bernardo J. R. , Costa Rogério Luís de C. , Santos Leonel , Rabadão Carlos
Published: October 2021

In smart cities, technologies and systems of various types, from manual sensors to data collection devices, cooperate to improve citizens' wellbeing. They take advantage of information technologies and the internet of things (IoT) to increase citizens' welfare through the implementation of services with distinct objectives, like reducing energy consumption and improving transport routes and health services. Due to their functionalities and characteristics, IoT devices work interconnectedly and collect large amounts of data. In this context, cybersecurity and privacy arise as topics of central interest, as security breaches can lead to personal data exposure and service interruptions and malfunctions, thus directly affecting citizens' welfare and the implementation of the Sustainable Development Goals. This chapter discusses how cybersecurity risks affect smart cities' operations and citizens' welfare. It presents some current cybersecurity techniques and how to apply them in the smart city context. It also reviews some open issues and future directions.
Production Techniques of Metallic Foams in Lightweight Materials
Authors: Beköz Üllen Nuray , Karabulut Gizem
Published: October 2021

Lightweight materials were needed in many different areas, especially in order to reduce the required energy in areas such as automotive and aerospace industries. Metallic foams attract attention in lightweight material applications due to their unique properties. The pores in its structure provide advantages in many applications, both structural and functional by promising both ultra-lightweight construction, energy absorption, and damping insulation. Production techniques of metallic foams can generally be classified as liquid, solid, gas, and ionic state production according to the physical state of the metal at the beginning of the process. The production technique should be chosen according to the usage area and desired properties of the metallic foam and the suitability in terms of cost and sustainability of production. For this reason, the details of the production techniques should be known and the products that can be obtained and their properties should be understood. In this respect, this chapter emphasizes the production methods from past to present.
A Moderation and Mediation Model of Social Media Marketing and Brand Loyalty Among Smartphone Users in Egypt
Authors: Hilal Omnia A.
Published: October 2021

Social media are being extensively used as a platform to conduct marketing and advertising activities (Shwetha et al., 2020). However, there is always a challenge in how organizations can figure out the results of social media marketing (Costa et al., 2018). Therefore, this study aimed to study the effect of social media marketing on brand loyalty among smartphone users in Egypt, moreover, to identify the effect of some demographics and psychographics on this relationship. A cluster sample consisting of 502 smartphone users have been surveyed using a questionnaire that has been designed and validated. Ex-Post Facto design was employed to achieve the research objectives. Multi group analysis and path analysis were employed to test research hypotheses. Results showed that social media marketing significantly affects brand loyalty, moreover, smartphone users’ age and education significantly affect this relationship. Finally, smartphone users’ psychographics significantly affected this relationship.
Antecedents and Consequences of Job Embeddedness in the Egyptian Hospitality Context
Authors: Aboul-Dahab Sameh Abd-elMaksoud
Published: October 2021

Although there are a growing body of studies on the influence of job embeddedness on turnover intention, few researches have been conducted on the drivers and outcomes of job embeddedness. Thus, this paper seeks to examine the drivers and outcomes of job embeddedness in the Egyptian hotels context. Data were collected from employees in the Egyptian hotels. Structural equation modelling was used to analyse the data. The results indicated that organisational support, employee advocacy, organisational rewards, and procedural justice are key drivers of job embeddedness. Furthermore, job embeddedness is related to organisational commitment and turnover intention. This study provides implications for the hospitality industry.
Examining Retailing Sustainability in the QR Code-Enabled Mobile Payments Context During the COVID-19 Pandemic
Authors: Alamoudi Hawazen
Published: October 2021

The COVID-19 has influenced customers' purchasing behavior, especially the acceptability of mobile payments based on quick response (QR) codes. Sustainability is key for retail to thrive. In this context, customer acceptance of QR code–enabled m-payments needs further improvement. This study examines the critical antecedents affecting QR code–enabled m-payments acceptance intention, with the aim of determining why customers must accept QR codes. The Mobile Technology Acceptance Model was modified, as we examined ease of use, usefulness, transaction convenience, transaction speed, attitudes, optimism, and personal innovativeness to investigate customers’ adoption of mobile shopping in grocery stores using questionnaire survey data of 351 respondents. Most constructs in the model influence shoppers’ intentions for accepting QR code–enabled m-payments. Consumers are more likely to use mobile shopping channels if the system is simple and easy to use. A validated model would be an invaluable guide for researchers during the creation and improvement of QR code–enabled m-payments studies.
Construction and Optimization of Green Supply Chain Management Mode of Agricultural Enterprises in the Digital Economy
Authors: Hu Jiang , Li Xuetao
Published: October 2021

Digital economy is a rapidly developing economic form under the background of the information age. This article introduces the construction and optimization of the green supply chain management model of agricultural enterprises under the digital economy, and intends to provide some ideas and directions for the development of green supply chain management of agricultural enterprises based on digital economy. This paper proposes the construction and optimization research methods of the green supply chain management model of agricultural enterprises under the digital economy, including the overview of green supply chain management, the construction of the optimization management model of the green supply chain of agricultural enterprises, and the digital economy under the construction of a green supply chain management practice index system for agricultural enterprises. Experimental results show that average Cronbachα value of each scale factor of the optimized management model in this paper is 0.876, and optimized decision-making coordination mechanism has high internal consistency.
Smart Healthcare Security Device on Medical IoT Using Raspberry Pi
Authors: Sengan Sudhakar , Khalaf Osamah Ibrahim , Priyadarsini S.  , Sharma Dilip Kumar , Amarendra K.  , Hamad Abdulsattar Abdullah
Published: October 2021

This paper aims to improve the protection of two-wheelers. This study is divided into two parts: a helmet unit and a vehicle unit. The primary unit is the helmet unit, which contains a sensor, and the second part is known as the alcohol sensor, which is used to determine whether or not the driver is wearing the user helmet correctly. This data is then transmitted to the vehicle unit via the RF transmitter. The data is encoded with the aid of an encoder. Suppose the alcohol sensor senses that the driver is intoxicated. In that case, the IoT-based Raspberry Pi micro-controller passes the data to the vehicle unit via the RF transmitter, which immediately stops the vehicle from using the Driver circuit to control the relay. To stop the consumption of alcohol, the vehicles would be tracked daily. If the individual driving the vehicle is under the influence of alcohol while driving, the buzzer will automatically trigger. The vehicle key will be switched off.
Multi-Objective Artificial Bee Colony Algorithm for Parameter-Free Neighborhood-Based Clustering
Authors: Boudane Fatima , Berrichi Ali
Published: October 2021

Although various clustering algorithms have been proposed, most of them cannot handle arbitrarily shaped clusters with varying density and depend on the user-defined parameters which are hard to set. In this paper, to address these issues, the authors propose an automatic neighborhood-based clustering approach using an extended multi-objective artificial bee colony (NBC-MOABC) algorithm. In this approach, the ABC algorithm is used as a parameter tuning tool for the NBC algorithm. NBC-MOABC is parameter-free and uses a density-based solution encoding scheme. Furthermore, solution search equations of the standard ABC are modified in NBC-MOABC, and a mutation operator is used to better explore the search space. For evaluation, two objectives, based on density concepts, have been defined to replace the conventional validity indices, which may fail in the case of arbitrarily shaped clusters. Experimental results demonstrate the superiority of the proposed approach over seven clustering methods.
Evaluation of Sulfides as Solid Lubricant: Lubricity of Compounded Sulfides
Authors: Sato Tomohiro , Ishikawa Shuhei , Saitoh Kenichi , Takuma Masanori , Takahashi Yoshimasa
Published: October 2021

Sulfide was used as solid lubricant, and MoS2 was popular. It was used industry as powder shape. Sulfur as oil additive; ZDDP, MoTDC were also well known. These composites make tribofilm which prevent seizure, scoring and some tribological troubles. In this paper, sulfides were synthesized by powder metallurgy technics. In addition, these sulfides were mixed with bronze powders and sintered as cylindrical specimen. As a result of the friction test in the lubricated condition, tribofilm were covered with specimen surface. By XPS observation, sulfides and oxides were detected on the specimen surface. In the test, additive was not contained in the lubricant because PAO as base oil was adapted. However, sulfide in the specimen affect the making the tribofilm, especially when bornite (Cu5FeS4) was used.
Effects of Temperature Rise of Grease on Lubricating Performance of Drive Elements under the Extreme Pressure
Authors: Chang Yuh Ping , Chu Li Ming , Wang Hsiang Yu , Liu Chien Te , Chen Qi Wen
Published: October 2021

To transfer more power and use it in a heavy load environment, the contact surface between the ball and the track must bear great stress. The temperature always rises due to friction, which is more likely to cause problems of material deformation and fatigue failure. As a result, it will be a key technology to maintain a certain lubricating effect of the transmission components under the environment of heavy load and temperature rise. Through the analysis of friction coefficient and electrical contact resistance, the greases are used to test the lubricating effect of the transmission elements under the heavy load condition. The results will be helpful for the industry to use heavy load greases as a reference.
Development of Nifedipine Amorphous Solid Dispersion Composed of Surface-Active Agents
Authors: Tubtimsri Sukannika , Weerapol Yotsanan
Published: October 2021

The amorphous solid dispersions (ASDs) containing amino methacrylate copolymer and surface-active agents were prepared to improve the nifedipine (NDP) dissolution. The different types of surface-active agent i.e., polysorbates 80, sodium lauryl sulfate (SLS) and polyethylene glycol (PEG) 400 were used. In order to evaluate the ASDs formulation,powder X-ray diffractometry and thermal analysis to characterize NDP crystallinity in ASDs and the dissolution study of NDP have been performed to compare the dissolution profiles. The ASDs were kept for 6 months to investigate the stability. In the X-ray diffraction pattern, no peak was observed in all samples of ASDs. No peak was found in sample of all ASDs from the thermograms. These results suggest that the drug may be molecularly dispersed in matrix of amino methacrylate copolymer. The drug dissolution at 120 min, from ASDs without surface-active agent and NDP powder were 58.31% and 17.95%, respectively. The dissolved NDP from ASDs composed of SLS, polysorbate 80 and PEG400 were 96.25%, 88.86% and 75.32%, respectively. These results may occur due to the reduction of surface tension, the addition of the low amount of high efficiency of surface-active agent e.g., SLS (compared with PEG400 and polysorbate 80) provided the higher NDP dissolution. The content analysis of NDP in selected ASDs was studied at the end of 3 and 6 months, the NDP content remained unchanged after storage.
Fabrication and Characterization of Azithromycin-Loaded Niosomes for Periodontitis Treatment
Authors: Kerdmanee Kunchorn , Limsitthichaikoon Sucharat
Published: October 2021

Azithromycin (AZM) is a potential drug for periodontitis treatment, but its poor water solubility could be problematic for local delivery to periodontal tissues. Entrapping AZM, which is a hydrophobic drug into niosomes, could effectively deliver drugs to the target site. This study aimed to design and fabricate azithromycin-loaded niosomes (NAZ) with desirable properties for intra-periodontal pocket administration. Span 60 and cholesterol were used to prepare niosomes with modified reverse phase evaporation method. NAZ were characterized and the effects of niosome composition were investigated. In vitro release and cell viability were evaluated. The results of this study indicated that with the specific ratio of Span 60 and cholesterol, the particle sizes of niosomes were in nano-sized (319 nm) with optimal zeta potential (-39.57 mV). Controlled release of AZM was achieved with release kinetic followed zero order model. NAZ exhibited low toxicity as cell viability was comparable to negative control.
Preparation and Characterization of Orodispersible Films Loaded Diclofenac Sodium/β-Cyclodextrin Inclusion Complexes
Authors: Saokham Phennapha , Burapapadh Kanokporn , Changsan Narumon , Sinsuebpol Chutima
Published: October 2021

Orodispersible films (ODFs) is orally pharmaceutical dosage form that rapidly disintegrates and instantly releases the drug when placed on the tongue. This study was firstly aimed to investigate physicomechanical properties of ODFs containing diclofenac sodium/β-cyclodextrin (DS/βCD) inclusion complexes prepared by solvent casting method. The influence of plasticizer, βCD and DS on hydroxypropyl metlhycellulose (HPMC) film was studied. Increasing of plasticizer concentration (e.g. PEG400 amd glycerol) resulted in decrement of disintegration time, strength and elasticity of HPMC films. When βCD was incorporated, opaque films were observed. Presence of βCD resulted in degrading of physicomechanical properties, except percentage of elongation representing the film’s elasticity. βCD films containing DS (DS/βCD films) were more brittle and transparent than blank βCD films. Amount of incorporated DS influenced on disintegration time and strength of obtained films. Cross-section scanning electron microscope (SEM) photomicrographs showed spherical particles scattered on DS/βCD films illustrating the occurrence of DS/βCD inclusion complexes during casting process. The DS/βCD inclusion complexes were then confirmed in both solid and solution. Furthermore, DS/βCD ODFs were prepared by incorporation of artificial sweeteners in DS/βCD films. It was found that DS/βCD ODFs containing xylitol were more brittle and their disintegration times were faster then those containing sucralose. Dissolution profiles were investigated then reported that release kinetic of DS/βCD films and ODFs were fitted to Higuchi model. In summary, the βCD-based ODFs containing DS were successfully developed.
Development of Triphala Extract-Loaded Mucoadhesive Films for Aphthous Ulcers
Authors: Panomsuk Suwannee , Kamolporn Songsriwittaya , Natnaree Chanmeesri , Paroch Boonyatulanont , Nuntharatanapong Nopparat
Published: October 2021

Triphala is a traditional Thai herbal formulation containing dried fruits of Phyllanthus emblica, Terminalia bellirica, and Terminalia chebula. It has wound healing, antioxidant and anti-inflammatory activities. The objective of this research was to formulate mucoadhesive films containing Triphala extract for aphthous ulcers treatment. The films were formulated using hydroxypropyl methylcellulose, HPMC, (5, 8, 10% w/w) as a film-forming polymer and glycerin (5% w/w) as a plasticizer. Triphala extract (2.5, 5, 10% w/w) was incorporated into the film during the film preparation. The films were then evaluated for the physical appearance, dissolution time, mechanical properties (strength and elasticity) and mucoadhesive capability to the porcine buccal mucosa. The antioxidant activity and anti-inflammatory activity of the films were also evaluated by DPPH assay and the proteins denaturation method, respectively. Physical properties revealed that Triphala-loaded HPMC films were transparent with brown color. All formulations showed 1-2 hr of dissolution times. Triphala films exhibited good mucoadhesive properties. Films prepared from the solution containing HPMC (10% w/w), glycerin (5% w/w), and Triphala extract (10% w/w) were the most appropriate formulation for further development due to suitable strength, elasticity, and mucoadhesive properties. Moreover, the films exhibited antioxidants and anti-inflammatory activity which may help relieve the symptom of aphthous ulcers.
Metakaolin Addition to Improve Geopolymerization Process and Properties of Waste Clay-Based Materials
Authors: Sgarlata Caterina , Formia Alessandra , Ferrari Francesco , Piccolo Federica , Leonelli Cristina
Published: October 2021

The exploitation of different kind of clayey waste (halloysitic, smectitic/illitic, kaolinitic) for the production of geopolymers in the view of a circular economy of mines is the main goal of this study. In particular, the addition of low percentages of metakaolin (5-15%) was evaluated to improve the chemical-physical properties and the consolidation degree of geopolymeric formulations produced with clays classified as mine’s by-products. In fact, these secondary raw materials are often not sufficient alone to obtain chemically stable formulations with acceptable mechanical properties but require the addition of reactive fillers. All samples contained thermally treated clays (600°C-700°C) and metakaolin as aluminosilicate precursors, alkaline solution of NaOH and Na2SiO3, and were cured at room temperature. The influence on the final products with MK addition was monitored with the evaluation of the chemical stability in water (pH and ionic conductivity measures), the comparison of setting times (Vicat needle) and mechanical performance.
Influence of Fly Ash on Corrosion Resistance of Refractory Forsterite-Spinel Ceramics
Authors: Nguyen Martin , Sokolař Radomír
Published: October 2021

This article examines the influence of fly ash on corrosion resistance of refractory forsterite-spinel ceramics by molten iron as a corrosive medium. Fly ash in comparison with alumina were used as raw materials and sources of aluminium oxide for synthesis of forsterite-spinel refractory ceramics. Raw materials were milled, mixed in different ratios into two sets of mixtures and sintered at 1550°C for 2 hours. Samples were characterized by X-ray diffraction analysis and thermal dilatometric analysis. Crucibles were then made from the fired ceramic mixtures and fired together with iron at its melting point of 1535°C for 5 hours. The corrosion resistance was evaluated by scanning electron microscopy on the transition zones between iron and ceramics. Mixtures with increased amount of spinel had higher corrosion resistance and mixtures with fly ash were comparable to mixtures with alumina in terms of corrosion resistance and refractory properties.
Analysis of the Effect of Crystallization Additives on the Resistance of Self-Compacting Concrete Exposed to Aggressive Gases
Authors: Dufka Ámos , Žlebek Tomáš , Melichar Tomáš
Published: October 2021

The article deals with the influence of crystallization additives on the life of self-compacting concrete (so-called SCC concrete), which are exposed to chemically aggressive environments. The focus is not only on the effect of the crystallization additive on the characteristics of the capillary-pore structure of SCC concrete, but especially long life durability of self-compacting concrete (two years expozition). The effect of individual types of aggressive environment is assessed on the basis of a set of physico-mechanical and physico-chemical analyzes.