jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Setia Rahmawan | Atep Rian Nurhadi | Enggal Mursalin | Rahmiati Darwis
Source: Indonesian Journal of Science and Education (article, 2024-04-29)
Field: Chemistry — Physical and Theoretical Chemistry

Why is Chemistry Education? Exploring the Motivation of Student Choices Learning motivation is critical to educational success, influencing students' engagement, persistence, and overall performance. Despite its importance, motivation determines students' choices for future careers and struggles in participating in learning activities. The aim was to characterize students' chemistry learning motivation in detail using the Academic Motivation Scale - Chemistry (AMS-Chemistry). This study employs a descriptive qualitative research design. The qualitative approach allows an in-depth exploration of personal experiences and perceptions of learning motivation in chemistry education. The AMS-Chemistry instrument consists of 28 statement items that measure aspects of amotivation, three types of extrinsic motivation, and three types of intrinsic motivation. The results show that the motivation profile to learn Chemistry in Chemistry Education students using the AMS-Chemistry instrument on the amotivation subscale tends to disagree (55,46%). On intrinsic motivation, the to know subscale tends to agree (65,80%) strongly, the to accomplish subscale has a high score on strongly agree (48,85%) responses, and the to experience subscale tends to respond strongly agree (35,34%). Extrinsic motivation includes the external regulation subscale tending to strongly agree (55,17%) and the introjected regulation subscale having a high score on strongly agree (62,36%) responses. The identified regulation subscale has a strongly agree (68,97%) response tendency. Chemistry education ; Mathematics education ; Chemistry ; Psychology ; Pedagogy ; Social psychology Various Chemistry Research Topics
Authors: Víctor Ernesto TAGARELLI GAETE | Alejandra Montenegro-Hernández | Mariela Ortiz | J. Vega‐Castillo
Source: AJEA (article, 2024-10-08)
Field: Materials Science — Materials Chemistry

Estudio de la respuesta electroquímica de la fase La0.1Sr0.9TiO3 como ánodo de celdas de combustible de óxido sólido Se estudió la fase La0.1Sr0.9TiO3 como potencial material de ánodo en celdas de combustible de óxido sólido de temperatura intermedia. Las muestras fueron sintetizadas mediante dos métodos químicos obteniendo diferentes microestructuras. Se evaluó el efecto de la microestructura en el comportamiento electroquímico mediante Espectroscopía de Impedancia Electroquímica, variando la presión parcial de hidrógeno y la temperatura. Se estudió la evolución de la resistencia de área específica en función de la presión parcial de hidrógeno para identificar el mecanismo de reacción. Los resultados obtenidos fueron analizados mediante ajustes con circuitos equivalentes y distribución de tiempos de relajación. Los resultados sugieren que la reacción de oxidación de hidrógeno está controlada por la etapa de adsorción disociativa en superficie, en ambos tipos de muestras. Además, se observó que la adsorción de hidrógeno es más rápida en el electrodo formado por nanopartículas más pequeñas, donde se encontró una menor energía de activación y un cambio en el coeficiente cinético. Art Advancements in Solid Oxide Fuel Cells ; Catalytic Processes in Materials Science ; Thermal and Kinetic Analysis
Authors: Abir Saleh | Shirly Avargil
Source: Proceedings. (article, 2024-06-10)
Field: Chemistry — Physical and Theoretical Chemistry

A Chemistry-Based Escape Room as a Tool for Teachers to Assess Student Thinking This study explores chemistry teachers' formative assessment (FA) knowledge and approaches in a collaborative dynamic learning environment through professional noticing and FA frameworks.Observation worksheets and perception questionnaires were collected from 36 high school chemistry teachers.A mixed method design is employed.Five categories were identified based on the results of the teacher perception questionnaire.Furthermore, three dimensions of noticing were identified.Our study will contribute to teachers' professional knowledge about assessment and FA. Research rationaleUsing FA activities it is a challenge for teachers (Duckor & Holmberg, 2023).To conduct FA effectively, teachers need guidance and support (Duckor & Holmberg, 2023;Murray et al., 2020).In this study, we examine teachers' FA knowledge through the professional noticing framework in a physical, face-to-face chemistry-based escaperoom (ER), designed for high school students.This pedagogical environment is an example of a collaborative and dynamic learning environment.In this environment, teachers can focus beyond content knowledge, on students' discourse and 21st century skills, such as collaboration (Brady & Andersen, 2021;Roig et al., 2023) and listening skills (Avargil et al., 2021).The main goal of this study is to investigate chemistry teachers' FA knowledge and approaches in a collaborative dynamic learning environment.The research questions are: (1) during an observation in a chemistry-based escape room (ER), what do chemistry teachers notice as important to assess? ( 2) what are the characteristics of chemistry teachers' interpretation? Research settingThe research setting includes a one-week professional development program (PD) called "Chemistry-based escape room as a pedagogical tool for assessment."The goals for the teachers were to: (1) experience the ER as learners, designing a map of the puzzles, and gaining knowledge of the chemical content, process, and structure of the ER, (2) observe a video of students participating in the ER activity, as well as learning about FA and teacher noticing, (3) discuss FA and teachers' professional perceptions of student activities in the ER. Mathematics education ; Computer science ; Chemistry ; Psychology Various Chemistry Research Topics
Authors: Lisandra Paulino dos Santos | Alexandre Rodrigues Tôrres | Leonardo Baptista
Source: International Journal of Advances in Chemistry (article, 2024-04-25)
Field: Materials Science — Materials Chemistry

Numerical Simulation of the Thermal Destruction of Organophosphorous The organophosphorus class of compounds has several usages nowadays. Some halogenated organophosphorus are used as flame retardants, and others are used as pesticides worldwide. In the last case, those compounds are subject to law regulation. They are now used as chemical weapons in many wars and terrorist attacks. Due to this variety of usages and the high toxicity of such compounds, the study of the proper treatment for residues containing those substances is significant to prevent the degradation of soil, water, and the atmosphere. For these reasons, the present study conducted numeric simulations of the incineration of organophosphorus compounds using kinetic models of combustion and pyrolysis found in the literature. The study of the degradation of this class of substances and the pollutant formation was made by simulating a homogeneous zeroth-order reactor and a continuous stirred tank reactor model. Due to the results of the simulations, the degradation made with the batch mode operation is efficient in the degradation of the substances considered in this work. The stream-containing process products have CO2, CO, HF, HOPO, and HOPO2. The three last cited have no determination about the emission ranges in the legislation, but their concentrations indicate the necessity of treatment for them. Furthermore, it was possible to evaluate the negative influence of the hydrocarbon used as fuel and the presence of CO2 in the degradation of the organophosphate compounds. Thermal ; Computer simulation ; Computer science ; Materials science ; Simulation ; Physics ; Thermodynamics Thermal and Kinetic Analysis
Authors: Antonios-Dimitrios Stefanou | Ioannis Chouthis | Xanthippi Zianni
Source: Journal of Applied Physics (article, 2024-03-18)
Field: Materials Science — Materials Chemistry

Non-monotonic variation of the thermoelectric efficiency with modulation mismatch in width-modulated nanowaveguides Efficient thermoelectric energy conversion at the nanoscale could power the Internet of Things and cool nanoelectronic circuits and improve the performance of quantum applications. Width-modulated nanowaveguides are suitable for these purposes because their thermoelectric efficiency can be geometrically tuned and integrated into the nanoelectronics industry processes. They are attracting increasing research interest stimulated by theoretical predictions for exceptional performance. To validate their potential, a better understanding of the effect of width modulation on thermoelectric efficiency is needed. So far, it is considered that (a) the thermoelectric efficiency increases monotonically with increasing width-mismatch due to decreasing phonon thermal conduction taking place without significantly affecting electron transport, (b) width-mismatch dominates the effect of width modulation in transport, and (c) phonons play the main role in increasing the thermoelectric efficiency. Here, we demonstrate counterevidence based on an investigation of the effect of width modulation on electrons so far overlooked. We reveal that (a) the thermoelectric efficiency varies non-monotonically with the modulation mismatch due to quantum effects on electron transport, (b) the modulation mismatch is quantified by the size-mismatch of the modulation rather than by the width-mismatch, and (c) it is electrons rather than phonons that play the main role in optimizing width modulation for maximum thermoelectric efficiency when quantum effects dominate. Our findings indicate that research should reorient from large width-mismatch toward optimal modulation-mismatch width-modulated nanostructures to enhance thermoelectric efficiency due to quantum effects. Our work provides new insight for designing nanowaveguides for efficient thermoelectric energy conversion at the nanoscale. Monotonic function ; Materials science ; Modulation (music) ; Thermoelectric effect ; Variation (astronomy) ; Condensed matter physics ; Physics ; Mathematics ; Thermodynamics ; Mathematical analysis Advanced Thermoelectric Materials and Devices ; Thermal properties of materials ; Thermal Radiation and Cooling Technologies
Authors: М. Б. Бегиева | Yu. A. Malkanduev | А. М. Хараев
Source:  (article, 2024-12-13)
Field: Materials Science — General Materials Science

THERMAL PROPERTIES OF COMPOSITES BASED ON POLYPROPYLENE AND MODIFIED NA+-MONTMORILLONITE Montmorillonite ; Polypropylene ; Materials science ; Composite material ; Thermal Material Properties and Applications ; Polymer Nanocomposites and Properties ; Advanced Theoretical and Applied Studies in Material Sciences and Geometry
Authors: Yu. A. Malkanduev | М. Б. Бегиева | A.A. Kokoevа
Source:  (article, 2024-12-13)
Field: Materials Science — Polymers and Plastics

CHEMICAL TRANSFORMATIONS OF ACRYLIC ACID Α-HALOID COPOLYMERS WITH N-VINYLPYRROLIDONE AND N, N-DIALKYLAMINOETHYLMETHACRYLATE One of the competitive advantages of the Far Eastern Federal District is the presence of the largest natural resource reserves in the Russian Federation: 81% of diamond reserves, 51% of forests, 37% of fresh water, 33% of aquatic biological resources, 44% of gold, 27% of gas and 17% of oil.It also occupies a unique economic and geographical position in the Russian Federation and in the Asia-Pacific region (APR).Despite this, the Far East of the Russian Federation is characterized by a discrepancy between the significant potential of resource development and the level of today's unsatisfactory state of the productive forces of the region's mining industry, as well as its transport and energy infrastructure.The article formulates specific current real-time problems and the corresponding imperatives (orders, imperatives) for the effective operation and development of the mining industry, following which will allow in the long term to reorient the region's economy to an effective path of development. Copolymer ; N-Vinylpyrrolidone ; Acrylic acid ; Polymer chemistry ; Materials science ; Computer science ; Chemical engineering ; Polymer ; Composite material ; Engineering Polymer Synthesis and Characterization
Authors: А. V. Boyarintsev | S. I. Stepanov
Source:  (article, 2024-12-13)
Field: Chemistry — Inorganic Chemistry

CARBEX PROCESS – A NOVEL HYDROCHEMICAL TECHNOLOGY FOR SPENT NUCLEAR FUEL REPROCESSING Spent nuclear fuel ; Process (computing) ; Nuclear reprocessing ; Waste management ; Radioactive waste ; Environmental science ; Nuclear engineering ; Process engineering ; Computer science ; Engineering ; Operating system Radioactive element chemistry and processing ; Extraction and Separation Processes
Authors: Yurii N. Morosov | A. V. Soloviev | A.V. Shabatin | Т. И. Шабатина
Source:  (article, 2024-12-13)
Field: Materials Science — Polymers and Plastics

CONTROL OF THE PARTICLE SIZE AND PHASE COMPOSITION OF NANOFORMS OF THE ANTIBACTERIAL DRUG DIOXIDINE IN THE PROCESS OF CRYOCHEMICAL SYNTHESIS One of the competitive advantages of the Far Eastern Federal District is the presence of the largest natural resource reserves in the Russian Federation: 81% of diamond reserves, 51% of forests, 37% of fresh water, 33% of aquatic biological resources, 44% of gold, 27% of gas and 17% of oil.It also occupies a unique economic and geographical position in the Russian Federation and in the Asia-Pacific region (APR).Despite this, the Far East of the Russian Federation is characterized by a discrepancy between the significant potential of resource development and the level of today's unsatisfactory state of the productive forces of the region's mining industry, as well as its transport and energy infrastructure.The article formulates specific current real-time problems and the corresponding imperatives (orders, imperatives) for the effective operation and development of the mining industry, following which will allow in the long term to reorient the region's economy to an effective path of development. Russian federation ; Diamond model ; Natural resource ; Resource (disambiguation) ; Business ; Phase (matter) ; Natural resource economics ; State (computer science) ; Process (computing) ; Diamond ; Position (finance) ; Economic system ; Economy ; Environmental protection ; Geography ; Economic policy ; Political science ; Economics ; Chemistry ; China ; Computer science ; Finance ; Law Polymer Synthesis and Characterization
Authors: Masniezam Ahmad | Khairul Azwan Ismail | Fauziah Mat | Mohd Hazwan Mohd Hanid | A Aziz
Source: Advanced and Sustainable Technologies (ASET) (article, 2024-12-02)
Field: Materials Science — Polymers and Plastics

Energy Absorption Characteristics of Thin-Walled Tubes Filled with Rice Husk and Kenaf Fibers This study investigates the energy absorption characteristics of thin-walled tubes filled with rice husk and kenaf fibers when compressed under axial compression. The aim of this study is to evaluate the crashworthiness parameters such as energy absorption (EA), initial peak load (IPL), crush force efficiency (CFE) and specific energy absorption (SEA). Experimental results show that tubes filled with rice husk and kenaf exhibit significant improvements in overall energy absorption compared to empty tubes. However, while both fillers enhanced EA, the SEA values were lower than predicted. Thus, it is suggested that further optimization, such as adjusting filler density or exploring hybrid filler combinations, could improve crashworthiness. This study highlights the potential for rice husk and kenaf fibers as sustainable filler options for lightweight, impact-resistant designs in automotive, aerospace, and other engineering applications, with opportunities for improvement in future research. Kenaf ; Husk ; Filler (materials) ; Crashworthiness ; Absorption (acoustics) ; Biocomposite Natural Fiber Reinforced Composites ; Textile materials and evaluations ; Internet of Things and Social Network Interactions
Authors: T.A. Munirov | А. Р. Давлетшин | Adel A. Munirova
Source:  (article, 2024-12-19)
Field: Chemistry — Inorganic Chemistry

THE PROCESS OF PRE-AROMATIZATION OF STRAIGHT-RUN GASOLINE ON A ZEOLITE-CONTAINING CATALYST - Aromatization ; Zeolite ; Catalysis ; Gasoline ; Process (computing) ; Process engineering ; Materials science ; Waste management ; Chemical engineering ; Chemistry ; Computer science ; Organic chemistry ; Engineering Zeolite Catalysis and Synthesis ; Inorganic and Organometallic Chemistry ; Catalysis and Hydrodesulfurization Studies
Authors: Josselin Delmas | Sofiane Hendili | Vincent Robin | S. K. Hilal | Pablo Pereira-Alvarez | David Iampietro | Mickaël Abbas | Sébastien Jutteau
Source: SPIRE - Sciences Po Institutional REpository (article, 2024-05-13)
Field: Materials Science — Materials Chemistry

Modélisation des contraintes résiduelles dans les soudures circonférentielles multi-passes bout à bout de tuyauterie en acier inoxydable austénitique pour la classification du risque de corrosion sous contrainte en milieu primaire National audience Materials science Metal Alloys Wear and Properties ; Hydrogen embrittlement and corrosion behaviors in metals ; Welding Techniques and Residual Stresses
Authors: Lilia H. Zagorodnyuk | S.V. MASALITINA | V.D. Ryzhykh | D.S. Makhorov
Source:  (article, 2024-12-11)
Field: Materials Science — General Materials Science

AFFINITY OF STRUCTURES - DESIGN PRINCIPLE AND CREATION OF EFFECTIVE COMPOSITES This article examines the impact of mass media on the methods of doing business in a digital market economy.Media to promote new ideas and highlight important issues, attract government attention, as well as means of advertising products and attracting potential customers. Composite material ; Materials science ; Computer science Material Properties and Applications
Authors: Gary A. Harms
Source: OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (article, 2024-08-22)
Field: Materials Science — General Materials Science

MOLYBDENUM SLEEVE EXPERIMENTS IN THE SANDIA CRITICAL EXPERIMENTS FACILITY Nuclear engineering ; Molybdenum ; Nuclear physics ; Engineering ; Physics ; Materials science ; Metallurgy Engineering and Material Science Research ; Nuclear and radioactivity studies ; Tunneling and Rock Mechanics
Authors: Meihui Zhang | Liu, Yaxue | Mengmeng Liu | Wenlin Qiu | Xiangcheng Zheng
Source: arXiv (Cornell University) (preprint, 2024-11-21)
Field: Materials Science — Materials Chemistry

Generalizing subdiffusive Black-Scholes model by variable exponent: Model transformation and numerical approximation This work generalizes the subdiffusive Black-Scholes model by introducing the variable exponent in order to provide adequate descriptions for the option pricing, where the variable exponent may account for the variation of the memory property. In addition to standard nonlinear-to-linear transformation, we apply a further spatial-temporal transformation to convert the model to a more tractable form in order to circumvent the difficulties caused by the ``non-positive, non-monotonic'' variable-exponent memory kernel. An interesting phenomenon is that the spatial transformation not only eliminates the advection term but naturally turns the original noncoercive spatial operator into a coercive one due to the specific structure of the Black-Scholes model, which thus avoids imposing constraints on coefficients. Then we perform numerical analysis for both the semi-discrete and fully discrete schemes to support numerical simulation. Numerical experiments are carried out to substantiate the theoretical results. Transformation (genetics) ; Exponent ; Mathematics ; Variable (mathematics) ; Statistical physics ; Black–Scholes model ; Mathematical physics ; Applied mathematics ; Mathematical analysis ; Physics ; Econometrics ; Philosophy Material Properties and Failure Mechanisms
Authors: Б. Е. Панченко | Людмила Миколаївна Буката | Denys Bahachuk | Larysa Martynovych | Оксана Миколаївна Зуй
Source: International Scientific Technical Journal Problems of Control and Informatics (article, 2024-03-06)
Field: Materials Science — Materials Chemistry

Cluster modeling of the interaction of statyonary SH-waves with a system of curvilinear cracks in a half-space A method is proposed for solving problems of mathematical physics for semi-infinite media containing systems of curvilinear cuts. Based on singular integral equations (SIE), a unified approach to solving the problem has been developed. Numerical implementation was carried out using parallelisation. A graph of the duration of the initial cluster hour is given for calculating an array of searched functions in the context of a parabolic form as a function of the number of processes for one variant of implementation. It is shown that the entire algorithm scales well and has an efficient number of processes. The expected result was obtained, because the structure of the calculation process in models based on SIE is mostly unchanged and built on well-defined procedures. It turned out that 150–200 processes are effective. An accuracy of 10–12 was achieved with the number of collocation points of the contour of each section N = 300, because the algorithm for numerical solution of the problem uses interpolation by Chebyshev polynomials in accordance with the fact that the unknown function has a key feature at the ends of the section, which causes a higher speed of convergence of the algorithm. The study of the question of the further increase in the accuracy of the result was not conducted. The corresponding dynamic boundary value problems for a restrained and force-free half-plane are studied. The influence of the curvature of defects, their interaction and proximity of the boundary on the magnitude and nature of the change in the dynamic stress intensity coefficients was studied. To check the reliability of the algorithm, two tests were carried out: removing three inhomogeneities at a distance of 106 of their length from each other and saturating the system by increasing the number of geometrically equal reflectors to 13–15. When removed, the characteristics of each reflector tend to the characteristics of a single one, and when saturated, they tend to the results of the corresponding periodic problem. The agreement between the results showed good reliability of the algorithm. The proposed method can be used to assess the influence of various mechanical or geometric factors on the strength of bodies with defects. Curvilinear coordinates ; Cluster (spacecraft) ; Space (punctuation) ; Physics ; Geology ; Geometry ; Computer science ; Mathematics Material Properties and Failure Mechanisms ; Electromagnetic Effects on Materials ; Geotechnical and Geomechanical Engineering