bluuebunny/crossref_metadata_2025 huggingface dataset:
Unusual Martian Foreshock Waves Triggered by a Solar Wind Stream Interaction Region
Authors: Su Zhenpeng , Wang Yuming , Zhang Tielong , Wu Zhiyong , Cheng Long , Zou Zhuxuan , Shen Chenglong , Guo Jingnan , Xiao Sudong , Wang Guoqiang , Pan Zonghao , Liu Kai , Hao Xinjun , Li Yiren , Chen Manming , Chi Yutian , Xu Mengjiao
Published: April 2023

Planetary bow shocks noncollisionally dissipate the incident bulk flow energy of solar wind into some other forms. To what extent and how solar wind disturbances affect the energy dissipation processes at the bow shocks on different planets remain unclear. With the Chinese Tianwen-1 and American Mars Atmosphere and Volatile EvolutioN missions, we present the first observation of significant modifications by a solar wind stream interaction region to the Martian foreshock waves, which are an important energy dissipation product of the bow shock. After the stream interface hitting Mars, an unusual band of foreshock waves emerged, with a central frequency of ∼0.4 Hz and frequency width of ∼0.2 Hz. These waves exhibited highly distorted waveforms, with peak-to-peak amplitudes of 10–25 nT in contrast to a background magnetic field of 6–9 nT. They were approximately elliptically polarized with respect to the wavevector and propagated highly obliquely to the background magnetic field. These waves reported here differed greatly from the commonly known Martian foreshock “30 s waves” and “1 Hz waves,” but resembled, to some extent, the less frequently occurring terrestrial foreshock “3 s waves.” Our present findings may imply an unexpected energy dissipation pattern of the Martian bow shock to the disturbed solar wind, which needs further observational, theoretical, and numerical investigations.
Carvedilol solubility enhancement by multicomponent crystallization with coformers of benzoic acid, isonicotinamide, and saccharin
Authors: Sopyan Iyan , Layyareza Rania Talinta , Megantara Sandra , Marvita Siska Sari
Published: April 2023

Multicomponent crystallization is a method that can modify the physicochemical properties of Carvedilol (CVD), thereby increasing its solubility. Based on in silico screening the coformers (Benzoic Acid, Isonicotinamide, and Saccharin) showed non-covalent interactions with CVD, so the multicomponent crystal preparation of CVD by solvent evaporation method used these coformers with mole ratios of 1:1, 1:2, and 2:1. Multicomponent CVD:Isonicotinamide (1:2) exhibits increased saturation solubility of up to 140 mg/L and increased dissolution of up to 99.48%. The infra-red (IR) spectrum showed a peak shift, a thermogram pattern that was different from the DSC results, and a new peak on the XRD multicomponent crystal diffractogram indicating the formation of a new solid phase compared to pure Carvedilol. Therefore, the formation of multicomponent crystals can increase the solubility and dissolution rate of CVD, and all characteristics indicate the presence of interaction between CVD and Isonicotinamide, and the formation of a new solid phase.
Les rêves d’Alexandre Grothendieck : la fonction « pont » de l’objet paternel
Authors: Houzel Didier
Published: April 2023

L’objet combiné mamelon/sein représente pour le bébé la première expérience de la bisexualité de la fonction contenante, nécessaire à la constitution de son identité de base. Le mamelon représente la composante masculine/paternelle ; le sein sa composante féminine/maternelle. La fonction de jonction entre la bouche du bébé et le sein maternel exercée par le mamelon correspond à la fonction « pont » paternelle décrite par Salomon Resnik. Cette bisexualité s’étaye sur les identification maternelle et paternelle de la mère. Le triangle œdipien incarné par le couple parental développe cette expérience de la bisexualité de la fonction contenante en permettant la constitution de l’identité sexuée de l’enfant. L’auteur illustre son hypothèse par l’analyse de deux rêves rapportés par le mathématicien Alexandre Grothendieck dans son récit autobiographique Récoltes et seamilles.
Art as Symbol of the Politically Good
Authors: De Duve Thierry
Published: April 2023

Au paragraphe 59 de la Critique de la faculté de juger, juste avant de se lancer dans la Critique du jugement téléologique, Kant écrit une phase que rien dans la Critique du jugement esthétique, qu’il s’apprête à conclure, n’annonçait : “Je dis maintenant que le beau est le symbole du bien moral”. Il fait toutefois précéder cette ligne d’une explication de ce qu’il entend par “symbole”, qu’il illustre par un exemple qui semble aussi abrupt et hors contexte que la phrase sur le symbolisme moral du beau lui-même : “Ainsi représente-t-on un état monarchique apr un corps animé s’il est gouverné selon des lois internes du peuple, mais par une simple machine (comme, par exemple, un moulin à bras) s’il est gouverné par une volonté singulière absolue.” Le présent article prend son départ dans la précipitation quasi-freudienne de Kant, qui concerne tant la phrase sur le symbolisme que l’exemple étrangement politique illustrant ce qu’il entend par “symbole”, afin de mettre à jour la validité de son affirmation sur le symbolisme moral du beau pour notre époque.
Resonance in Atmospheric Design
Authors: Wang Zhuofei
Published: April 2023

Aujourd’hui, l’objectif de la consommation s’est déplacé de la valeur d’usage pure à la valeur esthétique-expérientielle. Dans ce contexte, le concept de design subit une transformation correspondante - le design ne concerne plus uniquement la fabrication du produit lui-même. Au contraire, la création d’une atmosphère est placée au premier plan du travail de conception, à tel point que le produit devient l’un des éléments de la conception. La focalisation sur la conception de l’atmosphère nous permet de mieux réfléchir à l’interaction entre l’objet, la forme, l’espace, l’environnement et le corps humain, l'émotion et l’action. Notre étude se concentrera sur les questions suivantes : comment pouvons-nous créer une atmosphère qui puisse être ressentie comme bonne et significative ? Pour un designer qui travaille dans un contexte international, une autre question semble encore plus critique : dans quelle mesure une atmosphère significative peut-elle avoir un impact qui transcende les frontières culturelles individuelles ? Pour répondre à ces questions, nous tentons d’introduire le concept de résonance dans une exploration éthique de la conception d’atmosphères. Une relation de résonance peut se produire dans presque toutes les dimensions de la relation entre l’homme et le monde et fournir ainsi une orientation normative pour un bon mode de vie. Il incombe aux concepteurs de renforcer la sensibilité à la résonance des questions écologiques, interpersonnelles, interculturelles et marginales par la création de scénarios atmosphériques.
Le chien compagnon dans les productions Disney depuis les années 1950 : de l’anthropomorphisme à la redéfinition des interactions humains-chiens
Authors: Duranton Charlotte , Perrin Anaïs
Published: April 2023

Le chien, meilleur ami de l’homme, est très présent dans les productions culturelles pour la jeunesse. Les studios Walt Disney en ont notamment animé plus de cent. Nous nous sommes intéressées à la représentation du chien transmise aux jeunes spectateurs dans les films de la firme. Notre analyse chronologique montre une relation en deux temps : d’abord un anthropomorphisme exacerbé induisant une négation de l’animalité du chien, puis une évolution vers une reconnaissance de son individualité. Le cinéma étant témoin et acteur de notre rapport à l’animal, les chiens compagnons présents dans les dessins animés Disney participent donc de la diffusion progressive, mais encore hésitante, d’une relation humain-chien nouvelle et bienveillante.
Les Compagnons de la télévision. Éloge du sentiment et promotion des causes dans le magazine animalier 30 Millions d’amis (1976-2016)
Authors: Sécail Claire
Published: April 2023

Illustrant la massification du phénomène social des animaux de compagnie observé en France dès les années 1960, le magazine télévisé 30 Millions d’amis , créé par le journaliste Jean-Pierre Hutin et diffusé de 1976 à 2016, a sensibilisé des générations de publics aux bienfaits de la relation à l’animal-compagnon. Légitimant la libération du sentiment à l’égard des animaux, le programme a également contribué à promouvoir certaines causes à travers le récit de la souffrance des bêtes. Par sa longévité et sa popularité, 30 Millions d’amis contribue à mettre en lumière l’évolution des sensibilités et permet d’interroger la définition des catégories animales à travers leurs usages médiatiques et le rôle de la mise en récit télévisuelle. L’analyse des 5 300 reportages diffusés sur quarante ans montre que trois âges d’inégale durée structurent la morphologie de l’engagement et des sensibilités de 30 Millions d’amis  : l’âge de la célébration de l’animal-compagnon en 1976-1977 ; l’âge de l’affirmation des causes relatives à l’animal de compagnie (1978-1990) ; et l’âge de la diversification des causes et de leur extension au-delà de la catégorie dominante des animaux de compagnie (1991-2016).
Fuzzy differential subordination and superordination results for $ q $ -analogue of multiplier transformation
Authors: Lupaş Alina Alb , Shah Shujaat Ali , Iambor Loredana Florentina
Published: April 2023

In this paper the authors combine the quantum calculus applications regarding the theories of differential subordination and superordination with fuzzy theory. These results are established by means of an operator defined as the $ q $-analogue of the multiplier transformation. Interesting fuzzy differential subordination and superordination results are derived by the authors involving the functions belonging to a new class of normalized analytic functions in the open unit disc $ U $ which is defined and investigated here by using this $ q $-operator.
Experimental-numerical analysis to determine the efficiency of industrial lubricants in wire drawing process
Authors: Gomes dos Santos Thomas , Rosiak André , Alba Diego Rafael , Pacheco Wermuth Diego , Riffel Matheus Henrique , Pandolfo da Rocha Rafael , Schaeffe Lirio
Published: April 2023

Drawing is a manufacturing process that consists of indirect deformation by pulling the material through a tool with a conical geometry. The process is usually performed at room temperature (cold forming), so the selection of effective lubricants is critical. If lubrication is inadequate, there is a high risk that both, tool and the manufactured wire, will fail. In this study, annealed AISI 1020 steel rods were drawn and the effectiveness of three different industrial lubricants was tested. During the process, the drawing force values were recorded and used to determine the friction coefficient that developed under each lubrication condition. Numerical simulations were performed to further understand the process. Based on the experimental and numerical results, qualitative and quantitative analysis were performed for each condition. Among the different lubricants used in this study, zinc stearate showed the lowest value for drawing force, 18.8 kN, followed by Lub A and B with values of 20 kN and 20.6 kN, respectively. The numerical models showed excellent approximation to the force values determined in the tests. The values for the coefficient of friction obtained by both the numerical analysis and the empirical model indicate that zinc stearate has the highest lubricating effect among the lubricants focused on this study.
An Active Learning Approach for Applying STEAMeD-based Education in Engineering Programs
Authors: Zaher Ashraf A. , Hussain G. Amjad , Altabbakh Hanan
Published: April 2023

Applying STEM-based education in engineering programs using various active learning approaches has been shown to improve the quality of the learning process. This paper investigates further enhancements to the existing techniques via adding more emphasis on the learning components that are specific to Art, entrepreneurship, and Design. Different opportunities to apply the STEAMeD-based education in various engineering programs, which are delivered by liberal arts institutions, will be explored. The integration of the new emphases is demonstrated to resonate very well with satisfying the seven students’ outcomes that are dictated by ABET accreditation. The specific role of the augmented art component in promoting creativity, aesthetic appreciation, and better reasoning skills, is illustrated via different examples of simulation-based experiments and virtual modeling techniques. The entrepreneurship component of the engineering curricula is shown to better prepare the students for the challenging future via empowering them with better analytical skills, practical ingenuity, business-oriented communications, and adaptability to technological innovation, in an efficient way. It also overlaps with the requirements of the graduation design project that all students consider as the capstone of their engineering curricula. Adopting a project-based learning approach in many courses, at different levels in the curricula, proved to be very efficient, as verified by the many case studies illustrated in this paper. Tying the attributes of the STEAMeD-based education to the courses’ contents, with clear description of the learning outcomes, will be demonstrated. Also, addressing novel pedagogical approaches to better equip the students for their careers is considered. Finally, a comprehensive discussion and a conclusion is given to highlight possible extensions to the proposed techniques.
Adolescents’ Cognitive Abilities, Reaction Time, and Working Memory Performance by Vienna Test Systems
Authors: Veliks Viktors , Porozovs Juris , Kļaviņa Aija , Zuša Anna
Published: April 2023

Abstract - Mental and physical health components are critical in child’s development. However, adolescents are especially vulnerable group presenting multiple health risks of chronic disease, sleeping and eating problems. Moreover, the long time spent at screens increases possibility to develop addictions. There is a lack of comprehensive interdisciplinary assessment tools for adolescents, to assess their mental health components, and provide preventive activities. It is very important to develop a methodology that can accurately assess the minor cognitive and health deviations that can be caused by an unhealthy lifestyle and excessive time spent on screens. This research explores the possibilities to record and compare parameters of cognitive abilities, reaction time, and working memory using Vienna test systems for different groups of adolescents by their physical activity and health levels. The results of this study demonstrated that the reaction time in adolescents was shorter using the leading hand in comparison with using the non-leading hand, 272.842±44.001ms vs 306.631±57.081ms on Vienna test for low physical activity (LPA) adolescents group. In the STROOP test color evaluation results were faster than word reading test results. The median of reaction time of LPA adolescents for color evaluation was 0.897±0.221ms and 0.968±0.15ms for reading. Vienna test system has specific tests that can be used to determine memory parameters, providing different assessment approaches to compare the obtained results. Group of adolescents with mild chronic health conditions performs statistically significantly lower parameter in particular tests in comparison with adolescents with low and high physical activity.
Fiat lux et facta est lux: Leonardo Reveals the Secrets of the Heart and Arteries (in Health and Disease)
Authors: Armentano Ricardo L.
Published: April 2023

Five hundred years after his death, the figure of Leonardo da Vinci continues transmitting his tireless desire to know and learn. Leonardo is the symbol of a century in which progress impacted, shattering the thickness of dogmas. In the Quattrocento, the doors were opened, ideas spread and still feed us, clear our path, and enlighten us. Florence, in Leonardo's time, was the Silicon Valley of the Renaissance. Leonardo studied the dynamics of water flow in rivers, using colors to show the flow patterns, thus defining the continuous stress on the side walls of the river. He determined, with different colors, the flow characteristics in the center and near the edges of the rivers and extrapolated those findings to the blood that flows in the arteries. Leonardo studied the coronary artery and veins, heart and bronchia in detail and made several assumptions about the cause of atherosclerosis, based on his previous hydrodynamic studies of water flow. Leonardo theorized that diseases were derived from some imperfection in the structure of the human body and addressed the issue of atherosclerosis and its correlation with aging. He accurately described a case of portal hypertension with liver cirrhosis as well as pulmonary circulation and chronic obstructive pulmonary disease. Leonardo was the great pioneer in revealing the secrets of the heart and arteries
A Novel Approach for Electronic Medical Records Based on NFT-EMR
Authors: Mohanad A. Mohammed  , Hala B. Abdul Wahab
Published: April 2023

saving the patient medical record electronically is done via electronic medical records (EMRs) where all the patient-related information that consider private and sensitive is usually related to the treatment process, as well as the diagnoses process of a specific patient usually this information needs to be shared and re-submit by many peers doctors with each, In this paper, propose a novel approach for electronic medical records system using a non-fungible token (NFT) based on a customized permission blockchain built with secret sharing technology to reduce the key management overhead as well as provide a readable extension of the ledger to ensure it is easy to read and easy access from any type of computer. The system that uses NFT for electronic medical records (NFT-EMR) ensures easy access and guarantees availability, privacy, and security providing authority to the patient over his data as well as proof of ownership which is done using proof of secret shares and consistency this system can be used in real-world between hospitals and medical centers and within metaverse world. The NFT-ERM system was evaluated using the main evaluation factors used to evaluate blockchain and compared to the standard ERM system.
Assessment of Potential Recovery Viability for Colorado Pikeminnow Ptychocheilus lucius in the Colorado River in Grand Canyon
Authors: Dibble Kimberly L. , Yackulic Charles B. , Bestgen Kevin R. , Gido Keith , Jones M. Tildon , McKinstry Mark C. , Osmundson Doug B. , Ryden Dale , Schelly Robert C.
Published: April 2023

Colorado Pikeminnow Ptychocheilus lucius, the Colorado River's top native predatory fish, was historically distributed from the Gulf of California delta to the upper reaches of the Green, Colorado, and San Juan rivers in the Colorado River basin in the Southwestern United States. In recent decades Colorado Pikeminnow population abundance has declined, primarily as a result of predation by warmwater nonnative fish and habitat modification following dam construction. Small, reproducing populations remain in the Green and upper Colorado rivers, but their current population trajectory is declining and the San Juan River population is maintained primarily through stocking. As such, establishment of an additional population could aid recovery efforts and increase the species' resilience and population redundancy. The Colorado River in Grand Canyon once supported Colorado Pikeminnow, but until recently habitat suitability in this altered reach was considered low as a result of depressed thermal regime and abundant nonnative predators. Climate change and ongoing drought has presented an opportunity to evaluate the feasibility of native fish restoration in a system where declining reservoir storage has led to warmer releases and re-emergence of riverine habitat. These changes in the physical attributes of the river have occurred in concert with a system-wide decline in nonnative predators. Conditions 10 y ago were not compatible with reintroduction feasibility in Grand Canyon; however, as a result of rapidly changing conditions an expert Science Panel was convened to evaluate whether the physical and biological attributes of this reach could now support various life stages of Colorado Pikeminnow. Here, we report on the evaluation process and outcome from the Science Panel, which developed a science-based recommendation to the U.S. Fish and Wildlife Service on reintroduction feasibility. The Science Panel concluded that current habitat attributes in Grand Canyon could satisfy some, but perhaps not all, Colorado Pikeminnow life history requirements. This reach has the potential to support adult and subadult growth, foraging, migrations, and spawning, but low juvenile survival may limit recruitment. However, populations of other native species are successfully reproducing and increasing in western Grand Canyon, even in areas once considered suboptimal habitat. Should managers decide to move to the next phase of this process, actions such as experimental stocking and monitoring, telemetry studies, bioenergetics modeling, and laboratory-based research may provide additional information to further evaluate a potential reintroduction effort in this rapidly changing but highly altered system.
Problématisation dans une séquence forcée sur la respiration au cycle 3 : quels savoirs appris par les élèves ?
Authors: Chalak Hanaà , Briaud Philippe
Published: April 2023

Des séquences « forcées » mises en place dans les travaux sur les apprentissages par problématisation mobilisent des cadrages didactiques spécifiques dont le but est de permettre la construction de savoirs problématisés. Cependant, les recherches en sociologie de l’éducation montrent que certains cadrages d’activités proposées aux élèves peuvent produire des malentendus scolaires et des inégalités d’apprentissage. Les difficultés pointées par ces chercheurs interrogent nos travaux sur l’apprentissage par problématisation et l’effet des cadrages faibles imposés par les séquences forcées. Dans quelles mesures ces cadrages permettent-ils aux élèves d’apprendre des savoirs problématisés ? Pour l’étudier, nous analysons quatre entretiens individuels d’élèves effectués après une séquence forcée sur la respiration en fin d’école primaire (élèves de 10 ans) et leurs productions individuelles (écrites ou orales) au fil des séances afin de mettre en relation les savoirs qu’ils mobilisent et ce qu’ils en disent après la séquence. Les résultats obtenus permettent de repérer des malentendus qui concernent la nature des savoirs qu’ils restituent.
Apprendre au travail : rôles et questions didactiques posées, une modalité de transmission dans la formation professionnelle
Authors: Veillard Laurent
Published: April 2023

L’apprentissage par le travail a toujours constitué un élément central de la formation professionnelle au sein des structures compagnonniques. Au-delà de cette institution particulière, cet article questionne la place et le rôle de l’apprentissage en situation de travail dans les cursus de formation professionnelle en France depuis la période précédant le début de la phase d’industrialisation. La perspective retenue est didactique et historique, au sens où sont étudiés les liens établis à différentes époques, dans les débats et les pratiques de formation, entre les caractéristiques du travail, celles des savoirs nécessaires à l’exercice de celui-ci et les modalités de transmission à mettre en place pour acquérir ces savoirs, dont en particulier l’apprentissage en situation de travail. Trois périodes, caractérisées par des conceptions et des pratiques différentes, sont mises en évidence : la période précédant la phase d’industrialisation, caractérisée par l’apprentissage sur le tas comme modalité quasi-unique d’acquisition d’un métier ; la mise en place progressive d’un système principalement scolaire de formation, délégitimant l’apprentissage en situation de travail à partir de la fin du 19e et jusque dans les années 1970 ; enfin, la période actuelle qui plébiscite les formations en alternance et donc la combinaison de phases d’enseignements en école et d’apprentissage en situation de travail. Dans la dernière partie de l’article, quelques problématiques didactiques majeures posées par l’alternance sont discutées, incluant des propositions pour les traiter qui sont issues des recherches développées en didactique professionnelle.
Les leurres des modèles statistiques
Authors: Guyon Hervé , Harma Kahina , Nôus Camille
Published: April 2023

L’idée usuelle sous-jacente à l’usage des modèles statistiques est qu’ils sont rigoureux et objectifs, garantissant une fiabilité aux résultats supérieure aux analyses qualitatives. Au travers de différents leurres associés à ces modèles, nous montrerons que les modèles statistiques sont réductifs et normatifs, qu’ils ne permettent jamais de valider une théorie et qu’ils s’inscrivent dans une démarche subjective et discursive. Sans nier l’intérêt de tels modèles, notre propos cherchera à convaincre que la modélisation statistique en sciences humaines s’inscrit dans une épistémologie pragmatiste.
A NEW COMPUTER-AIDED DIAGNOSIS OF PRECISE MALARIA PARASITE DETECTION IN MICROSCOPIC IMAGES USING A DECISION TREE MODEL WITH SELECTIVE OPTIMAL FEATURES
Authors: Phumkuea Thanakorn , Nilvisut Phurich , Wongsirichot Thakerng , Damkliang Kasikrit
Published: April 2023

Malaria is a life-threatening mosquito-borne disease. Recently, the number of malaria cases has increased worldwide, threatening vulnerable populations. Malaria is responsible for a high rate of morbidity and mortality in people all around the world. Each year, many people, die from this disease, according to the World Health Organization (WHO). Thick and thin blood smears are used to determine parasite habitation and computer-aided diagnosis (CADx) techniques using machine learning (ML) are being used to assist. CADx reduces traditional diagnosis time, lessens socio-economic impact, and improves quality of life. This study develops a simplified model with selective features to reduce processing power and further shorten diagnostic time, which is important to resource-constrained areas. To improve overall classification results, we use a decision tree (DT)-based approach with image pre-processing called optimal features to identify optimal features. Various feature selection and extraction techniques are used, including information gain (IG). Our proposed model is compared to a benchmark state-of-art classification model. For an unseen dataset, our proposed model achieves accuracy, precision, recall, F-score, and processing time of 0.956, 0.949, 0.964, 0.956, and 9.877 s, respectively. Furthermore, our proposed model’s training time is less than those of the state-of-the-art classification model, while the performance metrics are comparable.
Fundamentals of DNA Computation in the Domain of Cryptosystems
Authors: Adithya B. (f51844e1-5690-4bbc-afd8-22e81de10298  , Santhi G. (a711be60-0dcf-43de-a46b-b0de7a16eb7e
Published: April 2023

In the modern world of e-business and e-commerce, security of the confidentiality, integrity, and availability (CIA triad) of stored information along with transmitted data is essential. In cryptography, DNA cryptography is a newly emerging discipline arising from the work of DNA computing. The idea of DNA cryptography is based on DNA molecules capable of storing, processing, and transmitting information. The biological history of DNA cryptography and the theory of DNA computation are briefly described in this article. In comparison to traditional cryptography and quantum cryptography areas, DNA cryptography progresses via security and its applications. The primary objective of DNA cryptography research is to study the DNA molecule's features and reactions, create appropriate hypotheses, discover potential development pathways, find simple DNA cryptography implementation methods, and lay the groundwork for future growth.
Studies of the Use of Ultrasonic Equipment for the Removal of Asphalt-Resin Paraffin Deposits at Oil and Gas Transport and Storage Facilities
Authors: Khuramshina R.A. , Muratova V.I.
Published: April 2023

The article is devoted to the problem of cleaning oil transport and storage facilities from asphalt-resin-paraffin deposits. The issues of the use of ultrasound at oil transport and storage facilities for the removal of asphalt-tar and paraffin deposits are considered. The classification of methods for removing asphalt-tar and paraffin deposits in wells, pipelines and reservoirs is formulated. The review of scientific works on the use of ultrasound and ultrasonic installations for changing the basic physical and chemical characteristics of oil and tank cleaning is presented. Based on the analysis, a list of experimental studies is formulated that must be performed for the further formation of the scientific and technical base for the use of ultrasonic exposure for the removal of deposits. An overview of modern achievements in this field is presented, including scientific works on the use of ultrasound to accelerate the removal of deposits. An approach to the destruction of deposits directly during the operation of the tank due to the descent of the emitter to the surface of the boundary of the phases "oil-deposits" is considered. A system of mathematical equations has been developed that simulates the process of changing the temperature and melting of deposits, taking into account the operation of an ultrasonic emitter. As a result, the velocity of the movement of the melting front of deposits is determined depending on the duration of exposure. The recommended duration of exposure at each installation point is determined.
Mechatronic Design of Two-Jaw Pleating End-Effector for Large-Scale Carbon Fibre Reinforced Polymer Manufacturing
Authors: Chen Delun , Chan Wesley P. , Quek James , Van der Loos H.F. Machiel
Published: April 2023

Large-scale composite manufacturing processes, particularly vacuum injection moulding, are often hampered by expensive labour costs and low-levels of automation. The current process of manufacturing carbon fibre reinforced polymers (CFRP) for airplane fuselage workpieces requires experienced workers to spend hours manually placing, pleating and migrating multiple layers of fabrics in order to produce the desired composite part. A promising solution is to utilize robot platforms as assistants to alleviate the physical demands of the tasks. In this paper, we present the design and evaluate the performance of our novel Vacuum Infusion Moulding End-Effector (VIMEE) prototype in the pleating procedure of a simulated CFRP manufacturing vacuum bagging process, where our gripper system performs pleat loading, height detection and migration tasks. Experimental results show successful manipulation of nylon pleats by our mechatronic systems design. These results are promising, demonstrating our VIMEE design's potential value in vacuum injection moulding.
Acid-Activated Organobentonite-Based Highly Porous Foams via Polymerized High Internal Phase Emulsion: Preparation, Characterization and Machine Learning Prediction
Authors: Keasangam Neatithorn , Chungprempree Jirasuta , Preechawong Jitima , Nithitanakul Manit , Sapsrithong Pornsri
Published: April 2023

Preparation, characterization, and machine learning prediction of characteristics of acid-treated organobentonite-based highly porous foams via polymerized high internal phase emulsion were reported in this work. The effect of acid-treated organobentonite (AC-BTN) as an inorganic filler on the properties of poly(DVB)HIPE porous foam was experimentally investigated. Incorporating AC-BTN into the continuous phase of the high internal phase emulsion would improve thermal and mechanical properties and also increase the surface area of the resulting materials when compared to the unfilled poly(DVB)HIPE foam. Various amounts of AC-BTN, i.e., 0, 1, 3, 5, 7, and 10 wt.% of AC-BTN, were incorporated into the continuous phase to enhance the properties of poly(DVB)HIPE foam. The surface area and the degradation temperatures (Td) for the series of poly(DVB)HIPE foam filled with AC-BTN increased with increasing filler content from 0 to 10 wt.%. The maximum improvement of mechanical properties was found with the addition of 5 wt.% of AC-BTN into the continuous phase of poly(DVB)HIPE foam. Moreover, the adsorption of CO2 gas by poly(DVB)HIPE foam filled with AC-BTN was found to increase as well. It has been demonstrated in this study that the adsorption of CO2 by poly(DVB)HIPE foam filled with AC-BTN increased by 127% (from 0.00295 to 0.00670 mol/g) compared with neat poly(DVB)HIPE foam. Additionally, the machine learning (ML) method with a linear regression algorithm was employed for the characterization of poly(DVB)HIPE foam and the prediction of properties according to composite composition. Surface area, pore volume, Td, compressive stress, and Young’s modulus were evaluated. The accuracy of prediction using a machine learning application with a linear regression model for properties of poly(DVB)HIPE foam filled with AC-BTN was also reported.
Theoretical Study of Thermodynamic Stability Zone of Gas Hydrates Formed from Sea Water
Authors: Zhdanov R.K. , Gets K.V. , Bozhko Y.Y. , Belosludov V.R.
Published: April 2023

In this work we used a combination of molecular dynamic simulation and statistical thermodynamic theory in order to obtain stability region of propane hydrates formed from sea water. MD simulation were used to get thermodynamic properties of liquid water phase, while statistical thermodynamic theory were applied for solid hydrate phase. We reconstructed phase equilibrium line ‘sea water – hydrate – gas’ and according to our calculations the temperature shift of this line is about 3◦. Moreover, we have shown a possibility to obtain thermodynamic parameters of salt water directly from MD simulations with sufficient accuracy.
Studies on the Effect of Chemical and Microwave Exposure on the Heavy Oil Viscosity
Authors: Rufanova I.M. , Poletaeva O.Yu. , Leontiev A.Yu.
Published: April 2023

The effect of chemical and physical effects on the viscosity of heavy oil has been experimentally investigated in the work. The effect of the addition of a reagent on the viscosity of heavy oil, as well as the effect of microwave exposure under different modes on the effectiveness of reducing the viscosity has been established. The effectiveness of the joint physical and chemical action for reducing the viscosity of heavy oil is shown.
Biodegradation of UV Curing Thermochromic Prints with Respect to Printing Substrate
Authors: Vukoje Marina , Rožić Mirela , Cigula Tomislav , Kulčar Rahela , Itrić Ivanda Katarina , Pasanec Suzana Preprotić , Hudika Tomislav
Published: April 2023

Amount of packaging waste is constantly increasing, resulting in different environmental problems. Packaging waste, mainly plastic and paper based, comprises about one-third of all municipal solid waste. Anaerobic degradation is common method of the waste management for the organic based materials. In this study, biodegradability potential of UV curable thermochromic ink, as most common sample od smart packaging, was studied. The used ink is based on polyurethane acrylate.. Results indicated that by the proper selection of materials the biodegradability aspect of printed samples can be varied. Moreover, the results point to heterogeneous degradation of prints surface. This can be confirmed by the determination of the prints’ total colour difference, which was relatively high in all cases pointing to print deterioration. Biodegradation of UV TC ink, based on polyurethane acrylate results in breaking down of the ester linkages i.e. due to the hydrolysis of the ester bonds. Within the used printing substrates, TC print on wood free uncoated paper shows the highest rate of biodegradation over 150 days of incubation, around 40%, followed by print on 100% recycled paper and wood free coated paper. The present study shows that TC prints in studied environment, are ultimately biodegradable.
About the Possibility of the Hydrate Formation in Subpermafrost Aquifers Saturated with Calcium Chloride-Type of Waters
Authors: Ivanova I.K. , Kalacheva L.P. , Portnyagin A.S. , Argunova K.K.
Published: April 2023

In this work, we consider the results of studying the natural gas hydrates formation in porous media saturated with fresh water and sodium chloride solutions of 5, 10, and 15 wt%. at a pressure of 8 MPa. The studies were carried out by the method of differential thermal analysis. It was found that the presence of salts in porous media reduces the degree of water conversion into hydrate, as well as the rate of the gas consumption in the process of the hydrate formation
Investigation of Decomposition Processes of the Hydrates Obtained in Porous Media Containing Sodium Bicarbonate Type of Water
Authors: Kalacheva L.P. , Ivanova I.K. , Portnyagin A.S. , Argunova K.K.
Published: April 2023

The dissociation kinetic regularities of natural gas hydrates obtained in model porous media "sand - water" and "sand - sodium bicarbonate solution" have been studied. During the hydrates formation, the occurrence of a different number of phase transitions in the studied samples was established, depending on the salt concentration. It was shown that the parameters of the decomposition process of the hydrates obtained in the model samples are practically independent of the concentration of the sodium bicarbonate solution.
Observation of Internal Fatigue Cracks in Repeatedly Induction-Heated S45C Bearing Steel under Rotating Bending Fatigue
Authors: Kita Shusuke , Xiang Li , Matsueda Takahiro , Mizobe Koshiro , Kida Katsuyuki
Published: April 2023

Induction-heated steel has hard and soft layers. These layers can cause an internal fatigue crack originating from the boundary of these layers when cyclic stress is applied. Repeated heating is known as a method for improving fatigue strength, and it was applied to induction heating method. Repeatedly induction-heated steel had high fatigue strength compared to single quenching. We performed rotating bending fatigue tests of low carbon steel (JIS-S45C) induction-heated three times, and observed the fracture surfaces and the microstructures of internal fatigue cracks. The internal fatigue cracks originated from the area around the boundary between soft and hard layers surrounding crack origin. Some pearlite and ferrite can be seen. There were pearlite and dimples on the soft layer of internal fatigue crack and clear grains on the hard layer of the crack. From chase-up observation, we revealed that internal fatigue crack originated from soft layer.
Rigid Bronchoscopy for Post-tuberculosis Tracheobronchial Stenosis
Authors: Kim Hojoong
Published: April 2023

The healing process of tracheobronchial tuberculosis (TB) results in tracheobronchial fibrosis causing airway stenosis in 11% to 42% of patients. In Korea, where pulmonary TB is still prevalent, post-TB tracheobronchial stenosis (PTTS) is one of the main causes of benign airway stenosis causing progressive dyspnea, hypoxemia, and often life-threatening respiratory insufficiency. The development of rigid bronchoscopy replaced surgical management 30 years ago, and nowadays PTTS is mainly managed by bronchoscopic intervention in Korea. Similar to pulmonary TB, tracheobronchial TB is treated with combination of anti-TB medications. The indication of rigid bronchoscopy is more than American Thoracic Society (ATS) grade 3 dyspnea in PTTS patients. First, the narrowed airway is dilated by multiple techniques including ballooning, laser resection, and bougienation under general anesthesia. Then, most of the patients need silicone stenting to maintain the patency of dilated airway; 1.5 to 2 years after indwelling, the stent could be removed, this has shown a 70% success rate. Acute complications without mortality develop in less than 10% of patients. Subgroup analysis showed successful removal of the stent was significantly associated with male sex, young age, good baseline lung function and absence of complete one lobe collapse. In conclusion, rigid bronchoscopy could be applied to PTTS patients with acceptable efficacy and tolerable safety.
Dynamic Load Analysis of Motion Converter Ball Bearings in a Pericyclic Transmission
Authors: Weinzapfel Nick J. , Bolander Nathan W. , Mathur Tanmay D. , DeSmidt Hans , Smith Edward C.
Published: April 2023

Performance of ball bearings in the motion converter subassembly of an internally driven, single-speed, torque-split, twin configuration pericyclic transmission prototype is evaluated to extend the analytical knowledge base on this innovative transmission concept. A dynamic model of
the transmission is developed with high-fidelity models of the installed rolling element bearings to determine their reactions. Attention is focused on the pair of ball bearings supporting the motion converter subassembly which are subjected to a complex combination of loads, including radial
and axial forces, moments, carrier motion, and possibly internal preload. Then the influence of internal axial clearance and preload on the behavior of the rolling elements is analyzed with a fully dynamic ball bearing model. Provisions to consider the carrier motion and a robust integration
algorithm for component orientations are presented. Finally, a microstructure-based fatigue life simulation of the critical bearing component is performed to demonstrate the effect of clearance/preload on bearing reliability.
Rediscovering Primary Cilia in Pancreatic Islets
Authors: Lee Eun Young , Hughes Jing W.
Published: April 2023

Primary cilia are microtubule-based sensory and signaling organelles on the surfaces of most eukaryotic cells. Despite their early description by microscopy studies, islet cilia had not been examined in the functional context until recent decades. In pancreatic islets as in other tissues, primary cilia facilitate crucial developmental and signaling pathways in response to extracellular stimuli. Many human developmental and genetic disorders are associated with ciliary dysfunction, some manifesting as obesity and diabetes. Understanding the basis for metabolic diseases in human ciliopathies has been aided by close examination of cilia action in pancreatic islets at cellular and molecular levels. In this article, we review the evidence for ciliary expression on islet cells, known roles of cilia in pancreas development and islet hormone secretion, and summarize metabolic manifestations of human ciliopathy syndromes. We discuss emerging data on primary cilia regulation of islet cell signaling and the structural basis of cilia-mediated cell crosstalk, and offer our interpretation on the role of cilia in glucose homeostasis and human diseases.
Cardioprotective effects of Pinus eldarica bark extract on adrenaline-induced myocardial infarction in rats
Authors: Safaeian Leila , Haghighatian Zahra , Zolfaghari Behzad , Amindeldar Mahdi
Published: April 2023

Objective:

To investigate the effect of Pinus eldarica bark extract on adrenaline-induced myocardial infarction.

Methods:

Hydroalcoholic extract was prepared using maceration method and its total phenolic content was determined using the Folin-ciocalteu method. Pretreatment was done by oral administration of 100, 200, and 400 mg/kg Pinus eldarica bark extract for 16 days in male Wistar rats. Injection of adrenaline (2 mg/kg, s.c.) was performed on the 15th and 16th days for induction of myocardial infarction. Lead II EEG was recorded. Serum cardiac marker enzymes and antioxidative parameters were evaluated and a histopathological examination of heart tissues was performed.

Results:

Pretreatment with Pinus eldarica bark extract especially at its high doses significantly lowered the ST-segment elevation, improved heart rate, and decreased RR interval in ECG pattern of rats with adrenaline-induced myocardial infarction. It declined serum markers of heart damage including aspartate aminotransferase, lactate dehydrogenase, and creatine phosphokinase-MB, and also decreased lipid peroxidation marker, and heart weight while raising total antioxidant capacity and considerably improved histopathological alterations of the heart induced by adrenaline.

Conclusions:

Pinus eldarica bark extract shows beneficial cardioprotective and antioxidant effects against adrenaline-induced myocardial infarction. It can be further explored as a potential treatment for myocardial infarction.
Hybrid-based bat optimization with fuzzy C-means algorithm for breast cancer analysis
Authors: Valliappa Chocko , Rajendran Reenadevi , Balasubramaniam Sathiyabhama , Sennan Sankar , Thanikachalam Sathiya , Velmurugan Yuvarajan , Sampath Kumar Nirmalesh Kumar
Published: April 2023

Background:

Breast cancer is one of the most frequent types of cancer among women and early identification can reduce the mortality rate drastically. Feature selection is one of the significant tasks in the breast cancer analysis process. Several types of feature selection algorithms have been implemented to select the most appropriate feature for breast cancer analysis. However, they have to take a longer time to converge, over-fitting problems and providing less accuracy. Hence, a hybrid bat optimization algorithm combined with chaotic maps and fuzzy C-means clustering algorithm (BSCFC) is proposed for feature selection.

Aims and Objectives:

An integrated optimized bat optimization algorithm combined with chaotic maps and fuzzy C-means clustering algorithm (BSCFC) is proposed to determine the relevant feature. Materials and Methods: Breast cancer mini-Mammographic Image Analysis Society database (MIAS) dataset is used for analysis. Further, median filters are used for preprocessing, Region of Interest (ROI) was utilized for segmentation, gray level co-occurrence matrix (GLCM), and texture analysis are utilized in the feature extraction process. A hybrid bat optimization algorithm combined with chaotic maps and fuzzy C-means clustering algorithm (BSCFC) is proposed for feature selection. K nearest neighbor (KNN) classifier is used for classification.

Results:

Performance of the proposed system is evaluated using standard measures and achieved the highest accuracy rate of (98.2%), specificity of (97.3%), and sensitivity of (98.3%) as compared to other relevant methods such as bat, chaotic bat, chaotic crow search, ant lion optimization, and chaotic ant lion optimization algorithm.

Conclusion:

The proposed BSCFC algorithm is designed to improve the performance of convergence speed and control balance between exploration and exploitation rate using five types of chaotic maps namely sinusoidal, sine, gauss, logistic, and tent maps. The results show that the BSCFC with sinusoidal maps can significantly boost the classification performance of the BSCFC algorithm in classifying the breast cancer images with reduced features, which in turn optimizes the radiologists' time for their interpretation.