bluuebunny/crossref_metadata_2025 huggingface dataset:
El mundo de la moral entre el cielo y la tierra. A propósito de la típica de la razón pura práctica
Authors: Longás Fernando
Published: July 2022

A partir de una interpretación del pasaje que Kant dedica a la típica de la capacidad de juzgar pura práctica, el autor sitúa el que a su juicio constituye el centro del problema de la filosofía crítica kantiana, a saber, mostrar que la razón en su uso práctico puede ser efectivamente moral. Desde ahí sostiene que la solución dada por Kant a este severo problema termina por consolidar la subordinación del uso teórico de la razón al uso práctico, lo que se identifica con la subordinación de la verdad a la libertad. La conclusión es que dicha subordinación, que habría de cambiar de modo irreversible el curso de la filosofía, solo es posible mediante una fractura de la experiencia (crítica de la experiencia), que termina por poner la acción y, en definitiva, la vida humana, ante una representación de lo real que desborda, desde la libertad y la historia, lo que las categorías del entendimiento nos enseñan como verdad de la naturaleza.
“Lo que el hombre hace de sí mismo”, “Lo que la naturaleza hace del hombre”. Sobre la vía media cosmopolítica entre teoría y práctica en Kant
Authors: Silva Fernando M. F.
Published: July 2022

El punto principal de nuestro estudio es que el problema kantiano de la adecuación entre la teoría y la práctica, uno de los temas clave en el pensamiento práctico de Kant en general, fue erróneamente percibido no solo por quienes lo defendieron y concibieron su posibilidad, sino también por quienes lo negaron y defendieron su imposibilidad. Nuestra posición, por el contrario, es que Kant, al abordar un problema aparentemente irresoluble, se vio obligado a concebir una vía media, un “elemento intermedio de conexión” entre la teoría y la práctica; una alternativa que, en nuestra opinión, no surge de la mera necesidad, sino que está íntimamente interconectada, desde mediados de la década de 1770 en adelante, con la formación de un esquema fundamental de conocimientos humanos (que se encuentra a lo largo de su actividad académica), un esquema que, en su tridimensionalidad, establece a la Antropología Pragmática como una tercera dimensión del conocimiento humano y por tanto como el único terreno propicio para el diálogo entre teoría y práctica, más allá de la mera posibilidad o imposibilidad del problema. Esperamos que esta proposición nos permita determinar lo que Kant entiende por el “talento de la naturaleza”, el “acto especial del poder de juzgar” que debe servir como elemento conector entre la teoría y la práctica; explicar cómo la Antropología debe ser vista como la morada natural de esta interacción mediadora; y, finalmente, posicionar mejor, así como delimitar, el alcance de la visión antropo-cosmológica kantiana del Hombre en el Mundo, que se sitúa precisamente entre lo meramente racional de la teoría y lo meramente empírico de la práctica.
Italian Thought: los comunes y el uso
Authors: Ortiz Gala Irene
Published: July 2022

El presente trabajo explora las propuestas de Giorgio Agamben y Roberto Esposito, dos de los máximos representantes del Italian Thought, en torno a la noción de comunidad y bienes comunes. A partir de un análisis sobre la comunidad basada en el munus, se examina el estatuto de los bienes comunes en contraposición al derecho de propiedad. A continuación, se presenta la discusión en torno a la noción de uso de los bienes comunes y su difícil reconciliación con el aparato jurídico. Finalmente, se estudia la noción de inapropiable que vertebra el estudio italiano de los bienes comunes.
La crítica de Simone Weil a Marx: un referente para el pensamiento ecosocialista
Authors: Matheu Ribera Pau , Pérez-Fernández Andrea
Published: July 2022

En este artículo abordamos el pensamiento político de la filósofa francesa Simone Weil. En particular, analizamos dos elementos fundamentales de su crítica al marxismo, a saber, sus reflexiones sobre el fenómeno del poder y su crítica a la teoría del desarrollo ilimitado de las fuerzas productivas. Lo hacemos en diálogo con dos de los pioneros de la crítica ecosocialista a Marx en España: Manuel Sacristán y Francisco Fernández Buey, ambos lectores de Weil. El objetivo es señalar la relevancia del pensamiento de la filósofa no solo por su influencia en algunas de las grandes reflexiones ético-políticas de la tradición socialista en el siglo XX, sino también por su capacidad para interpelar el presente.
Les dividendes de « la guerre contre le terrorisme » : milicianisation, États et interventions internationales au Mali et au Burkina Faso
Authors: Quidelleur Tanguy
Published: July 2022

Depuis le début de la guerre au Mali en 2012 et l’intervention militaire française qui visait à chasser les djihadistes, les populations au Sahel ont connu une dégradation constante de leur sécurité. Les violences sont notamment alimentées par des groupes d’autodéfense, perçus comme des moyens de stabilisation par les États centraux qui les soutiennent. Ceux-ci se multiplient et forment un « marché de la protection », dans un contexte de mise en armes des conflits, de circulation transnationale des pratiques et d’interventions internationales croissantes. Une co-production de la violence se construit alors autour d’une lutte pour le monopole de la collaboration avec les États nationaux et leurs partenaires. Ces processus s’accompagnent d’une militarisation croissante des groupes, notamment grâce au travail d’entrepreneurs politiques. Les formes de la mobilisation par le bas diffusent le métier des armes et préparent un dispositif sécuritaire visant à susciter une intervention par le haut. Cette « milicianisation de la guerre contre le terrorisme » et les concurrences politiques qui en découlent, polarisent d’autant plus les sociétés sahéliennes et prolongent les violences.
Enjeux politiques, littéraires et linguistiques dans les marges d’un texte majeur de la Renaissance d’oc : Les Obros et Rimos Prouvenssalos de Louis Bellaud
Authors: Chabaud Sylvan
Published: July 2022

En 1595 paraissait le recueil, posthume, du provençal Louis Bellaud. Il s’agit du premier livre imprimé à Marseille, son édition est liée au contexte politique très particulier de la courte période de sécession de la cité phocéenne, en plein conflit religieux. Cette œuvre composée principalement de sonnets en langue d’oc est aujourd’hui considérée comme une référence du corpus littéraire occitan baroque. Sans l’effort d’un autre poète, Pierre Paul, sans l’installation d’une imprimerie voulue par les deux nouveaux maîtres de la ville : Louis d’Aix et Charles de Casaulx, ce texte n’aurait certainement pas traversé les siècles. Dans les marges de l’œuvre, une trentaine de pièces en occitan, français mais aussi latin, castillan ou italien (éloges, sonnets, quatrains, préface) forment un ensemble singulier dévoilant les enjeux politiques, littéraires et linguistiques liés à cette édition. Nous nous attardons sur ces pièces, sur leurs dédicataires, sur leurs auteurs, sur les langues employées. Nous tentons de comprendre comment, autour de l’œuvre bellaudine, s’organise tout un réseau (tout un jeu de pouvoir) qui marquera la Renaissance littéraire provençale de cette période.
Images du pouvoir et pouvoir de l’image. Les ornements gravés d’Antoine Dieu et Jean Audran en marge du poème sur le dôme royal des Invalides (1702)
Authors: Paunet Marianne
Published: July 2022

Dans le sillage des livres de prestige du milieu du xviie siècle, le poème dédié à l’église royale des Invalides de Pierre de Bellocq prend les atours d’une parution de luxe, richement illustrée. Il est édité au format in-folio par Michel Brunet à Paris en 1702, tandis que Pierre Lepautre (1652-1716) a dirigé la production des ornements en taille-douce, dont nous attribuons l’invention à Antoine Dieu (1662 ?-1727) et la gravure à Jean Audran (1667-1756).En faisant un pas de côté par rapport au texte, l’ambition est de saisir comment les images contextualisent la parution. Tout en illustrant fidèlement le poème, elles sont un écho à d’autres formes de représentations, notamment les décors éphémères contemporains, dont elles partagent le même répertoire visuel. Plus qu’un objet littéraire, le poème aux Invalides est abordé comme un objet culturel, marqueur d’une époque.Ces ornements historiés que sont vignettes, lettres grises et culs-de-lampe s’inscrivent dans une histoire du livre à figures, à mi-chemin des premiers livres de prestige des années 1640 et de l’épanouissement du livre illustré au siècle suivant, assurant une continuité avec les travaux de François Chauveau puis de Sébastien Leclerc, et avant les plus célèbres ouvrages des Cochin, suivis de Charles Eisen ou Moreau le Jeune.
D’un paratexte, l’autre : les métamorphoses pastorales de Jean Mairet
Authors: Elslande Jean-Pierre van
Published: July 2022

Cet article analyse les différents régimes paratextuels qui accompagnent la publication des trois premières pièces de Jean Mairet, au tournant des années 1630 : de l’absence de tout paratexte dans le cas de Chriséide et Arimant, à la présence d’un paratexte inhabituellement développé dans le cas de La Silvanire ou la morte-vive, en passant par un paratexte plus conforme aux pratiques éditoriales de l’époque dans le cas de La Sylvie. Ces trois cas de figure permettent non seulement à Mairet de s’affirmer comme un dramaturge pleinement conscient de son travail, mais aussi de prendre indirectement position dans le contexte politique de l’absolutisme montant.
Les pouvoirs des lettres dans les traductions platoniciennes de Loys Le Roy
Authors: Vuilleumier Antoine
Published: July 2022

Cet article se propose d’analyser les enjeux de pouvoir qui traversent les marges des traductions de Platon (Le Timée, Le Phédon, La République, Le Banquet) publiées par l’humaniste Loys Le Roy dans la décennie 1550. Dans un premier temps, l’étude vise à montrer comment les marges (préfaces, privilèges, commentaires, etc.), en inscrivant les traductions dans les circonstances du règne de Henri II, transforment celles-ci en instrument de propagande royale. Ensuite, il examine la manière dont le traducteur fait de ses traductions un instrument de décoration de la langue française, d’acculturation de la philosophie grecque et de glorification du pouvoir royal. Les discours marginaux sont aussi l’occasion d’une réflexion sur les rapports entre les « armes » et les « lettres », qui légitiment celles-ci vis-à-vis du pouvoir, notamment en raison de leur vertu éducative. Enfin, nous montrons comment le discours sur l’utilité publique des lettres participe également d’une stratégie de captation personnelle de la faveur royale.
Communities of Practice Through Intercultural Telecollaboration
Authors: Castro-Prieto Paloma , Salomão Ana Cristina Biondo , Derivry-Plard Martine , Fan Sa-Hui
Published: July 2022

Communities of practice provide challenging learning opportunities based on the principles of interaction, participation, dialogue, and relationship building. This chapter aims to explore how intercultural telecollaboration contributes to the development of a multicultural community of practice in the context of initial teacher education. Four groups of student teachers from four different languages and cultures—two in Europe, one in Asia, and one in South America—work together through the medium of English in an intercultural telecollaboration project. The project is examined in terms of community building through the experience journal of the student teachers as a reflective narrative on how they built a sense of community to sustain their interactions and negotiation of meaning. The findings strongly suggest that intercultural telecollaboration creates a powerful learning environment where students and teachers can find opportunities to cooperate, understand and support each other, and enhance their perceptions of teaching English from an intercultural perspective.
Analyzing L2 Learners' Engagement Strategies to Assess Intercultural Communicative Competence in a Telecollaborative Exchange Project
Authors: Di Sarno-García Sofia , Gimeno-Sanz Ana
Published: July 2022

Following the discourse-semantic subsystem of engagement within the appraisal framework, this chapter investigates the extent to which participants of a telecollaborative exchange project between the Universitat Politècnica de València (Spain) and the University of Bath (UK) engaged with their partners' and their own ideas. Participants engaged in two different online cultural discussions which were qualitatively processed and broken up into T-units. This information was subsequently processed quantitatively considering all the tokens that frame engagement. The scrutiny of this data elucidates the extent to which the learners in the two online cultural discussions acquired new knowledge by acknowledging the others' ideas and by providing evidence to support their own statements. The results reveal the presence of expansive and contractive strategies, both of which are recurrent in academic reasoning. Students used more expansive than contractive statements, which can be interpreted as their willingness to adopt a different perspective from their own.
“My English Is Not Good, I Can't Talk to You”
Authors: Pho Hanh
Published: July 2022

Social contact, especially intercultural interactions, of international students when studying abroad has recently become a burgeoning research interest. This chapter presents a longitudinal mixed methods study that explores social contact patterns of international students in British higher education during the sojourn and examines the rationale behind such patterns. Findings show that English language proficiency and confidence in English communication skills play major roles in motivating intercultural interactions. However, these alone may not guarantee more pleasant intercultural experiences. Based on these findings, suggestions for researchers and educators in the intercultural communication field are proposed.
Automated Math Symbol Classification Using SVM
Authors: Vaidehi K.  , Manivannan R.
Published: July 2022

Handwritten character/symbol recognition is an important area of research in the present digital world. The solving of problems such as recognizing handwritten characters/symbols written in different styles can make the human job easier. Mathematical expression recognition using machines has become a subject of serious research. The main motivation for this work is both recognizing of the handwritten mathematical symbol, digits and characters which will be used for mathematical expression recognition. The system first identifies the contour in handwritten document segmentation and features extracted are given into SVM classifier for classification. GLCM and Zernike Moments are the two different feature extraction techniques used in this work. SVM with RBF kernel is used for classification. Zernike Moment features overperforms than GLCM. Zernike Moment achieves 97.89% accuracy and GLCM achieves 87.61% accuracy.
A Multi-User Shared Mobile Payment Protocol in the Context of Smart Homes
Authors: Liu Yonglei , Hao Kun , Zhang Weilong , Gao Lin , Wang Li
Published: July 2022

A multi-user shared mobile payment protocol based on group signature is proposed. In order to solve the problem of limited resources such as computing power and storage space of mobile devices, a group signature algorithm with a shorter signature length is adopted. And smart phone is used as mobile payment proxy for smart devices. For user privacy protection, anonymous mobile payment and device use among family members are realized. This protocol uses group signatures and challenge-response based secure mutual identity authentication to resist parallel sessions, replay, man-in-the-middle, denial of service and other attacks in the network. Moreover, the complexity of protocol interactions of mobile payment and device use is reduced from O(n) to O(1). Finally, the indistinguishability game proof and analysis show that the proposed protocol in this paper can realize the anonymity of family members and meet the security requirements of the system, such as mutual identity authentication and traceability, and has certain application prospects in the smart home market.
Fractals for Internet of Things Network Structure Planning
Authors: Paramonov Alexander , Tonkikh Evgeny , Muthanna Ammar , Elgendy Ibrahim A. , Koucheryavy Andrey
Published: July 2022

Wireless communication networks and technologies are witnessed a huge improvement which gain a large number of users. In addition, the choice and using methods of the network are depending on the environment in which it is created. Although the network in each case is unique, many of them share a lot of common. To this end, we propose a new approach for planning the structure of the Internet of Things (IoT) network based on fractals, where fractal figures are utilized to describe the structure of the target environment. Moreover, fractal dimension’s estimation, fraction area occupied by the target environment, and network model are used in the planning process. This approach allows you to choose a model that accurately describes the properties of the environment. Finally, the results proved the suitability of this approach for the IoT network structure planning in an urban or other environment based on the target environment’s data.
Misinformation in Social Media During Disasters
Authors: Vasudevan Jayan , Alathur Sreejith
Published: July 2022

The study was focused on the impact of social media and misinformation during the distress. The type of information shared in social network depends on the people behavior. During the distress the impulsive behavior will result in sharing of the misinformation unknowingly which will affect the people already in distress. The paper investigates the impact of social networks in the distressed areas due to natural calamity. The data was collected from the distressed area by offline mode and from other areas by online mode. The target informants were the affected people and the people involved in the relief and rescue operations. Confirmatory Factor Analysis was used to test whether the data fit for the hypothesized model. The study revealed that the social media played a crucial role in the relief and rescue operations and at the same time the misinformation has halted the operations in some places.
Managing Electoral Violence Through Constructive Use of Social Media
Authors: Gikandi Joyce Wangui , Njuguna Christine W. , Kabaria-Muriithi Joan , Kathuri-Ogola Lucy
Published: July 2022

This study sought to assess the extent to which social media has been misused in the context of electoral processes to escalate violence and how social injustices among vulnerable youth in urban communities have further aggravated the violence. The study attempts to conceptualize and contextualize the phenomenon of electoral violence within emerging democracies in the digital era. This research is based on transformative social protection theoretical framework. Descriptive correlational design was adopted to assess the phenomena of electoral violence and its consequences in Kenya, among poor urban youth living in informal settlements in Nairobi County. The findings reveal a strong positive relationship between perpetual electoral violence, poverty and social injustices among the vulnerable communities. The strategies for mitigating misuse of social media among youth to escalate social unrest and electoral violence are elucidated including redesigning civic education and participatory civic engagement through inclusion of the marginalized and underprivileged youth.
Maker Education Challenge in Social Sciences
Authors: El Hafiz Subhan , Widiasih Puti Archianti , Eryandra Alvin
Published: July 2022

The present article aims to explain the challenges of maker education in social science, specifically in psychological courses. Three distinctive but inseparable challenges are the products, the professional competencies, and technology. The present articles show that the challenges can be overcome since the barrier is mainly in the back of educators’ minds. This paper argues that maker education should be cultivated in psychological courses to enhance meta-competencies, i.e., creativity in problem-solving, and to appreciate a prominent scholar in Psychology who creates a psychological product, i.e., counseling couch, namely Sigmund Freud. Further, a subject of maker education has been applied in psychological courses that show the benefit of making tangible products. The subject, i.e., creative and innovative, has successfully trained students to develop their creativity through making a product to address daily psychological issues. Finally, the course design and the effect on the students were discussed.
To Study the Impact of Social Network Analysis on Social Media Marketing Using Graph Theory
Authors: Kar Rupsha
Published: July 2022

Marketing requires an understanding of relationships and current research has progressed much beyond the simple dyadic relationships to look at how social media networks influence the behavior of customers. Social media's power is fascinating as a seemingly inconsequential figure emerges from the ruins and attracts tens of thousands, if not millions, of followers and thus providing an average individual a huge platform to interact with the rest of the world. Academics have used Network theory and formal network analysis approaches to harvest the large pool of social media influencers available on the internet. The goal of this paper is to use various graph theory algorithms to portray the impact of social network analysis on internet marketing, with a primary focus on social media influencers, and to illustrate a variety of network measurements ideas that may be employed in social media management research that takes into account the enormous social media communication network.
Unveiling Electronic Structure and Spin-Resolve of Bulk Bi2O2X (X = S, Se, and Te) Materials: A Computational Study Based-On Density Functional Theory
Authors: Falihin Lalu Dalil , Harsojo Harsojo , Absor Moh. Adhib Ulil
Published: July 2022

Bi2O2X (X = S, Se, and Te) group materials are widely studied compounds by replacing X atoms with group VI transition metals (chalcogens). We have systematically studied the electronic properties of the ternary compounds using the first-principle calculation density functional theory (DFT). We found that the Bi-p orbital dominantly characterized the conduction band minimum (CBM) located around the Gamma point, while the valence band maximum (VBM) located around the X point is mainly originated from the contribution of the chalcogen X-p orbitals. Focusing on the CBM at the Gamma point, we observed a fourfold-degenerate state at each band. Turning the SOC split these bands become double degenerate, except the Gamma point due to time reversibility. Further investigation of the spin component confirms that the double degenerate bands of Bi2O2X at the CBM around the Gamma point indicates the existence of the hidden spin polarization, which is a promising candidate for spintronics applications.
The Improvement of the Method to Determine the Temperature in Steel Reinforced Concrete Slabs in Assessment of their Fire Resistance
Authors: Nekora Valeriia , Sidnei Stanislav , Shnal Taras , Nekora Olga
Published: July 2022

The existing means for calculating the fire resistance of steel reinforced concrete horizontal structures beyond the fire resistance limit for more than two hours have been studied. There were conducted the computational experiments on the analysis of thermal load in case of fire for up to 3 hours, without taking into account the mechanical load on steel reinforced concrete slabs, modeled using steel sheets. The indicators obtained as a result of thermal computational experiments provide an opportunity to analyze the temperature distribution in the thickness of steel reinforced concrete horizontal structures made with a steel sheet. The relevant results can be used to determine the indicators of fire resistance of these structures for at least 3 hours. Thus, the thermal dependences, studied in this work, are a scientific basis for improving the capabilities of existing methods for determining the fire resistance of steel reinforced concrete horizontal structures with a steel sheet. The process of determining the temperature distribution indicators in these structures was performed using the standard method for solving the equations of thermal conductivity using the finite element method. Based on the results of solving the thermal problem, the graphs of thermal dependences were constructed, providing an opportunity to further analyze the indicators of fire resistance on the basis of the onset of signs of loss of load-bearing and insulating capacity. In order to perform computational experiments, the necessary calculation models were built that take into account the thermal effect on the studied structures under the standard temperature mode of fire.
Preparation and Characterization of Modified Clay - Application to the Adsorption of an Industrial Dye
Authors: Feddal Imene , Hafdi Bochra , Mimanne Goussem , Taleb Safia
Published: July 2022

The objective of this work is the valorization of certain local clays by their use in the treatment of waste water. For this, we have improved the surface properties of a natural Algerian Clay from the west of Algeria from the deposit of ghousel (Maghnia). The treatments carried out are the following: physical and chemical. The prepared material (calcined and activated) was characterized by infrared spectroscopy, measurement of the cation exchange capacity, specific surface and by measuring the pH (pzc). Then, the clay used is applied to the adsorption of an industrial dye (yellow bemacid) in aqueous solution. The quantitative analysis of the dye was followed by UV-Visible spectrophotometer, this analysis allows to determine the best conditions that favor the adsorption such as contact time, adsorbate concentration, adsorbent mass, solution pH and temperature.
Effect of Silica Content on the Surface Quality of Cast Iron in Shell Mould Process
Authors: Lertwatchraphol Aisoon , Canyook Rungsinee
Published: July 2022

Resin Coated Sand (RCS) is an important raw material for the Shell mould process. This research aimed to study the effect of silica content on the surface quality of cast iron in the shell mould process. The four kinds of sand are Australian sand, Rayong sand, Reclaimed sand and River sand. All sand was mixed with phenolic resin for making Resin Coated Sand. The chemical composition of sand was tested by X-Ray Fluorescence. The result found that the SiO2 content of each sand was different. The SiO2 content of Australian sand 99.8%, Rayong sand 98.6%, Reclaimed sand 90.3% and River sand 89.2%. The morphology from the microscope was found that sand grains exhibited different shapes that affect mechanical properties such as bending strength and thermal expansion of Resin Coated Sand. The qualification of Resin Coated Sand is bending strength and thermal expansion from Australian sand is the highest. On the other hand, River sand is the lowest bending strength and thermal expansion. The casting result showed that the burn on and veining defects were found on the casting surface. The veining occurred with Australian sand. While, the burn on occurred with Rayong sand, Reclaimed sand and River sand.
Research of Fire Resistance of Fire Protected Reinforced Concrete Structures
Authors: Kovalov Andrii , Otrosh Yurii , Poklonskyi Victor , Semkiv Oleg , Tomenko Marina
Published: July 2022

A finite element model for thermal engineering calculation of fire-resistant multi-hollow reinforced concrete floor in the ANSYS software package has been developed. The model allows to evaluate the fire resistance of fire-resistant and unprotected reinforced concrete structures both under load and without it. With the help of the developed model, the heat engineering calculation of the fire-resistant reinforced concrete multi-hollow slab was carried out. The results of numerical simulation are compared with the results of experimental study of fire resistance. An approach is proposed that allows to take into account all types of heat transfer by specifying cavities as a solid body with an equivalent coefficient of thermal conductivity. The adequacy of the developed model was checked, as a result of which it was established that the calculated values of temperatures correlate satisfactorily with the experimental data. The largest deviation in the measurement of temperatures is observed at 100 minutes of calculation and is about , which is 9%.
Temperature of Aluminum Alloy Strip During Casting Using a Vertical Type High Speed Twin Roll Caster
Authors: Haga Toshio , Kurahashi Hiroyuki , Hashimoto Naoya , Watari Hisaki , Nishida Shinichi
Published: July 2022

The temperature of a strip cast using a vertical type high-speed twin-roll caster was measured by inserting a k-type thermocouple into the strip. The effects of the roll speed and roll load on the cooling rate and temperature at the roll gap were investigated using two aluminum alloys: A383 and Al–4.8%Mg. The thickness of the thermocouple was 0.1 mm, and the sampling time was 0.01 s. The cooling rate increased and the temperature at the roll bite decreased with decreasing roll speed and increasing roll load. The positions of the liquidus and solidus lines were measured, and the reduction of the thickness of the strip was inferred from the roll gap at the solidus line.
Effect of Orbital Welding Parameters on the Weld Geometry
Authors: Thien Tran Ngoc , Trinh Quoc Thang , Nguyen Trung Hau
Published: July 2022

In orbital welding technology, it is difficult and time-consuming to make a standard weld by manual welding. This requires a skilled weld. Therefore, a more optimal welding method than automatic rotary welding has been created to replace the conventional manual welding method. This significantly improves weld quality and reduces welding time. In this explanation, we have experimented with an automatic orbital welding device that integrates a filler wire-feeder device into the welding process. We refer to the American National Standard AWS D18.1/D18.1M: 2009 documents to review the weld results. We then analyze the advantages and disadvantages of the weld and propose solutions.
Improvement of Isotropic Strength of 3D Printing-Based Self-Healing Capsules by Controlling the Position of Holes
Authors: Lim Taeuk , Cheng Hao , Hu Jie , Wang Shu Le , Jung Won Suk
Published: July 2022

Self-healing capable of storing two or more solutions is proposed to heal cracks by manufacturing capsules with a 3D printer to enable structural design, repeatable fabrication, and strength analysis. The Fusion Deposition Modeling (FDM) method was used to design, analyze, and produce new, widely used self-healing capsules at low cost. However, since the PLA extruded from FDM has low interlayer adhesion energy, the strength varies depending on the load angle applied to the laminated surface and concrete structure, which degrades the performance of the self-healing capsule. Therefore, this paper designed a structure with isotropic strength by controlling the direction and number of solution injection ports of capsules manufactured by the FDM PLA method. In addition, the intensity isotropy of the load applied through the compression test and ANSYS in the x, y, and z directions were verified. As a result, as the arrangement and number of holes were different, the standard deviation of strength according to the direction decreased by 24%.
Experimental Investigations of the Thermal Decomposition of Wood at the Time of the Fire in the Premises of Domestic Buildings
Authors: Dubinin Dmytro , Lisniak Andrei , Krivoruchko Yevhen , Pobidash Andrii
Published: July 2022

Consideration was given to the issues relating to safety conditions and security arrangements during the thermal decomposition of wood at the time of the fire in the premises of domestic buildings. The data of experimental investigations obtained for the thermal decomposition of wood were given with the measurement data of the concentration of toxic gases (СО, СО2), oxygen (О2), and temperature depending on time and fire spreading conditions in the premises. The studies were carried out by comparing the changes in the temperature of the solid flammable materials with time and the emission intensity of toxic gas (СО, СО2) under the limited oxygen access at the time of the fire. The research data confirm those obtained for the gaseous atmosphere composition in the premises during the thermal decomposition of the solid flammable materials.
Fire Protection of Steel with Thermal Insulation Granular Plate Material on Geocement-Based
Authors: Kurska Tetiana , Khodakovskyy Oleksiy , Kovalchuk Artem , Guzii Sergii G.
Published: July 2022

This article presents the results of determining the fire-retardant efficiency of heat-insulating granular plate based on geocement to protect metal structures from fire. According to the results of fire tests, it they found that with a plate thickness of 40 mm, the metal surface of an I-beam they heated to a critical temperature of 500 °C after 100 minutes of fire tests. This indicator provides the fire resistance class of metal structures P90 and the III group of fire retardant efficiency of metal structures. Based on the calculated data according to Eurocode 3, it they found that the critical heating temperature of an I-beam up to 538 °C with a plate thickness of 40 mm they achieved after 105 minutes of fire tests. This provides the fire resistance class of the steel column P90 and the III group of fire retardant efficiency. In order to ensure the fire resistance class P120, in the future, it is necessary to increase the thickness of the heat-insulating granular plate to 50 mm, which will allow transferring metal structures to the II group of fire retardant efficiency.
Specific Aspects of the Study of the Surface Properties of Plywood
Authors: Tsapko Yuriy , Horbachova Oleksandra , Mazurchuk Serhii , Bondarenko Olga P.
Published: July 2022

Reducing the toxicity of plywood encourages the use of dry powder mixtures of polyester resin, as its dissolution in organic matter reduces environmental safety. The paper presents the results of studies of free surface energy and its components (polar and dispersed) for plywood, which is made on the basis of polyester resin. The sequences of polarity change and their ratio to the main component of wood after the formation of plywood board at high temperature, which are consistent with the structural and functional features of thermally modified wood. The resulting plywood is characterized by a reduced property of water absorption, because the free surface energy is reduced by 2.3 times and the polarity by 2 times, which is due to the thermal modification of the veneer. Thus, when applying a comprehensive approach to the study of wettability, polarity, interfacial tension, you can choose stable technologies for new wood products and expand its scope.
Influence of Temperature and Humidity of the Environment where the Concrete Hardening Takes over on the Efficiency of Surface Microdosis Application
Authors: Shyshkina Alexandra , Shyshkin Alexander
Published: July 2022

Studies have shown the effect of ultra-low doses of surfactants on the compressive strength of cement stone and fine-grained concrete, which harden under conditions of heat-wet treatment, due to lack of research and widespread use of such treatment in concrete technology. It is proved that in this case the effect of ultra-low doses of surfactants is to reduce the number of open pores in cement stone and concrete. Experimental studies have confirmed that the molecules of surfactants, such as sodium oleate, polyhydric alcohol or others, significantly changes the hydrogen content of water used for the manufacture of concrete. This increases the mechanical strength of cement stone and concrete. It is determined that the increase in temperature and humidity of the medium in which the concrete hardens leads to an increase in the effectiveness of ultra-low doses of surfactants on the formation of compressive strength
Interaction of C60 with Small Molecules: Adsorption - Inclusion Energy Calculation Using the Density Functional Theory
Authors: Apriati Yosephine Novita , Nugraheni Ari Dwi , Sholihun Sholihun
Published: July 2022

The interaction between small molecules and fullerene C60 has been analyzed using a quantum-mechanics-based DFT calculation. The small molecules are H2, H2O, NH3, O2, and O3. Each molecule is put inside and outside C60. Interaction of small molecules with C60 is observed by calculating the inclusion and adsorption energies. We find that C60 with H2 and H2O has negative inclusion energies. The inclusion energies of H2 and H2O are -0,02 eV and -0,01 eV, respectively, indicating that H2 and H2O are stabilized inside the C60. For system outside C60, interaction between O2 and O3 with C60 has negative adsorption energies. The adsorption energy of O2 and O3 are-0,07 eV and-2,10 eV, respectively, indicating that O2 and O3 are chemisorbed, which are easily bonded by C60.
Copper Tannate (CuTn) Based Coating on 3D Printed Face Masks
Authors: Urbina Javier , Tuesta Rodrigo , Chirre Luis , Hadzich Antonella , Flores Santiago
Published: July 2022

The impact of COVID-19 crisis on global supply chains caused a critical shortage of essential goods like medical devices. Additionally, massive consumption increased mask contamination and waste. 3D printing has become a fast and versatile manufacturing alternative that prevents a single use of masks. However, SARS-CoV-2 virus can persist on plastic surfaces for days. This study proposes the optimization of 3D printed masks, by applying a coating rich in hydrolyzable tannins and copper, in order to diminish the virus presence. Different paints were formulated with copper tannate and applied on thermoplastic polyurethane 3D panels to test bacterial stability. Results showed a significant reduction of colony-forming units on coated polymeric surfaces. Paints pigmented with copper tannates could improve the protection provided by printed masks, even against the COVID-19 virus.
Printability and Warpage Evaluation of Polypropylene/Nano Precipitated Calcium Carbonate Composite Prepared by Extrusion-Based 3D Printing
Authors: Comadre Marlo Joseph , Sy Jo Ann C. , Celorico Josefina R. , Collera Alvin Kim , Margarito Marianito T. , Basilia Blessie A.
Published: July 2022

Polypropylene (PP) is a promising material for extrusion-based additive manufacturing due to its low cost, chemical resistance, good mechanical properties, versatile, and can be applied in various industrial applications. Recent research has focused on addressing the warpage issue in 3D printing of PP filaments. The effect of environmental conditions and loading of nanoprecipitated calcium carbonate (NPCC) in the pristine polypropylene to decrease warpage using the Fused Deposition Modelling (FDM) printing technology was studied. PP-NPCC composite filaments containing 5, 10, and 15 NPCC (wt%) were prepared using the twin-screw extruder. The printability, physicochemical, and mechanical properties of the PP-NPCC blends were determined. Based on the results, the incorporation of NPCC has contributed to the improvement of 3D printability and warpage in the PP-NPCC composite. At controlled environmental conditions, the filament was printable and the warpage was decreased by 44% at 10% NPCC loading. At the same concentration, there was a 30% increase in compressive strength and 43% increase in elastic modulus of the 3D printed parts.
Numerical Simulation of CNC Incremental Forming of Straight Wall Parts Based on Model Partition and Non-Steep Surface
Authors: Wang Xian Rui , Zhu Hu , Jung Dong Won
Published: July 2022

In order to realize the CNC incremental forming of the straight wall parts, a CNC incremental forming method with the sheet metal posture adjustment in multiple directions based on the model partition and the non-steep surface was proposed in this paper. With the help of the non-steep surface, the sheet metal posture is adjusted to reduce the forming angle of the straight wall; to ensure the straight wall to be formed without breaking. The results of numerical simulation shows that the method proposed in this paper can form the straight wall parts that cannot be formed by the traditional multi-pass incremental forming, and the straight wall parts of the formed parts have better contour accuracy, uniform thickness distribution and applicability.
Identification of Material Viscoelastic Properties using the Motion of a Rigid Sphere Located at Tissue-Mimicking Material Interface in Response to a Dynamic Force
Authors: Koruk Hasan , Besli Ayca , Koc Hayati Omer , Yurdaer Salih Berk
Published: July 2022

The motion of a rigid sphere located at tissue-mimicking material interface in response to a dynamic force of short duration for the purpose of the determination of material viscoelastic properties was investigated in this study. The experiments were performed using a rigid sphere located at tissue-like material (gelatin phantom) interfaces. An electromagnet was used to apply the desired dynamic force to the sphere and a high-speed camera was used to track the movement of the sphere. Using the experimentally measured response of the sphere and the dynamic response of the sphere predicted by a sophisticated analytical model of the sphere located at a medium interface, the shear modulus, density and damping of the tissue-mimicking material were determined. The procedure followed in this study successfully produced the shear modulus, density and viscous damping ratio of the 20% (and 30%) gelation phantom as 1320 Pa, 1040 kg/m3 and 0.12 (and 2580 Pa, 1180 kg/m3 and 0.2), respectively. As the sophisticated theoretical model that is valid for small and large sphere displacements includes many parameters for the system such as the mass and size of the sphere, the inertia force of the medium involved in motion and the radiation damping due to shear waves and the experimental setup is very straightforward, it is believed that the procedure proposed in this study can be widely exploited to identify accurate material viscoelastic properties in practice.
Application of Magnetic Abrasive Finishing Process Using Alternating Magnetic Field for Finishing Polychlorotrifluoroethylene Resin
Authors: Xie Hui Jun , Zou Yan Hua
Published: July 2022

In previous studies, it has been verified that the magnetic abrasive finishing process using alternating magnetic field can achieve higher finishing efficiency and surface quality, and nanolevel finishing of 5052 aluminum alloy material and SUS304 stainless steel material has been realized. In this study, the feasibility for ultra-precision finishing of polychlorotrifluoroethylene resin by this process was investigated, and the cutting mechanism of particles was discussed. As a result, the cutting depth of the particles is mainly affected by the size of the magnetic particles and abrasive particles. According to the experimental results, under optimized experimental conditions, the surface roughness of the workpiece can be improved from 112.83 nm Ra to 5 nm Ra within 15 minutes.
Thin Wire Casting Using Twin Wheel Caster Equipped with Horizontal Wheels
Authors: Haga Toshio , Daishi Masanari , Watari Hisaki , Nishida Shinichi
Published: July 2022

solidification, process shortening and energy saving. A twin-wheel caster equipped with two additional horizontal wheels was proposed to cast thin aluminum alloy wire at higher speed. In the proposed twin-wheel caster, a groove was machined on the lower wheel. Two small horizontal wheels were positioned between the molten-metal-pouring launder and the upper wheel to assist the solidification of poured molten metal and to prevent burr formation. The alignment of the horizontal wheel sensitively affected the occurrence of wire defects. An Al-1.2%Fe wire with a cross section of 6.2 mm2 was cast at 15 m/min. Thinner wires without burring could be cast at a speed higher than that of the twin-wheel caster without the horizontal wheels. The surface condition of the as-cast wire cast by the twin-wheel caster equipped with horizontal wheels was worse than that of the casting using the twin-wheel caster without horizontal wheels.
The Regulation of Immunity
Authors: Boss Jeremy M
Published: July 2022

In their AAI President’s Addresses reproduced in this issue, Jeremy M. Boss, Ph.D. (AAI ’94; AAI president 2019–2020), and Jenny P.-Y. Ting, Ph.D. (AAI ’97; AAI president 2020–2021), welcomed attendees to the AAI annual meeting, Virtual IMMUNOLOGY2021™. Due to the SARS-CoV-2 pandemic and the cancellation of IMMUNOLOGY2020™, Dr. Boss and Dr. Ting each presented their respective president’s address to open the meeting.
Spatial correlates of COVID-19 first wave across continental Portugal
Authors: Barbosa Bruno , Silva Melissa , Capinha César , Garcia Ricardo A.C. , Rocha Jorge
Published: July 2022

The first case of COVID-19 in continental Portugal was documented on the 2nd of March 2020 and about seven months later more than 75 thousand infections had been reported. Although several factors correlate significantly with the spatial incidence of COVID-19 worldwide, the drivers of spatial incidence of this virus remain poorly known and need further exploration. In this study, we analyse the spatiotemporal patterns of COVID-19 incidence in the at the municipality level and test for significant relationships between these patterns and environmental, socioeconomic, demographic and human mobility factors to identify the mains drivers of COVID-19 incidence across time and space. We used a generalized liner mixed model, which accounts for zero inflated cases and spatial autocorrelation to identify significant relationships between the spatiotemporal incidence and the considered set of driving factors. Some of these relationships were particularly consistent across time, including the ‘percentage of employment in services’; ‘average time of commuting using individual transportation’; ‘percentage of employment in the agricultural sector’; and ‘average family size’. Comparing the preventive measures in Portugal (e.g., restrictions on mobility and crowd around) with the model results clearly show that COVID-19 incidence fluctuates as those measures are imposed or relieved. This shows that our model can be a useful tool to help decision-makers in defining prevention and/or mitigation policies.
Global spreading of Omicron variant of COVID-19
Authors: Zhang Pengxin , Yang Shuhan , Dai Shaoqing , How Jin Aik Darren , Yang Shujuan , Jia Peng
Published: July 2022

Although two years have passed since the coronavirus disease 2019 (COVID-19) outbreak, various variants are still rampant across the globe. The Omicron variant, in particular, is rapidly gained dominance through its ability to spread. In this study, we elucidated the spatial distribution pattern of Omicron from a global perspective. We used the cumulative number of notified COVID-19 cases per country spanning four weeks up to February 10, 2022, and the proportion of the Omicron variant genomic sequences from the Global Initiative on Sharing Avian Influenza Data (GISAID). The global spatial distribution of Omicron was investigated by analyzing Global & Local Moran’s I and Getis- Ord General G. The spatial weight matrix was defined by combining K-Nearest neighbour and flight connectivity between countries. The results showed that the epidemic is relatively severe in Europe, countries with a high number of Omicron cases and incidence tended to be clustered spatially. In contrast, there are relatively fewer Omicron cases in Asia and Africa, with few hotspots identified. Furthermore, some noted spatial outliers, such as a lowvalue area surrounded by high-value areas, deserve special attention. This study has improved our awareness of the global distribution of Omicron. The findings can provide helpful information for deploying targeted epidemic preparedness for the subsequent COVID-19 variant and future epidemics.