jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Ілона Драч | M. Dykha | Oleg Babak | Olena Kovtun
Source: PROBLEMS OF TRIBOLOGY (article, 2024-03-19)
Field: Materials Science — Materials Chemistry

Modeling surface structure of tribotechnical materials Modern tribology makes it possible to correctly calculate, diagnose, predict and select appropriate materials for friction pairs, to determine the optimal mode of operation of the tribo-joint. The main parameter for solving friction problems and other problems of tribology is the topography of the surface. The main purpose of the models in these tasks is to display the tribological properties of engineering surfaces. In the framework of the classical approach, the topography of the surface is studied on the basis of its images from the point of view of functional and statistical characteristics: the evaluation of the functional characteristics is based on the maximum roughness along the height and the average roughness along the center line, and the statistical characteristics are estimated using the power spectrum or the autocorrelation function. However, these characteristics are not only surface properties. They depend on the resolution of the device for measuring the surface geometry and the length of the scan. However, the degree of complexity of a surface shape can be represented by a parameter called the fractal dimension: a higher degree of complexity has a larger value of this parameter. Fractal dimensionality is a characteristic of surface relief and makes it possible to explain tribological phenomena without the influence of resolution. This article provides an overview of mathematical approaches to the description of the relief of engineering surfaces, in particular statistical, stochastic and topological modeling, their limitations, advantages and disadvantages. The implementation of the principles of the theory of fractal structures is discussed, which makes it possible to introduce the degree of imbalance of the tribological system into the analysis of structure formation in the surface and near-surface layers of materials and to describe the development of friction and wear processes. This is the basis for controlling the structure of the surface layers of materials with given properties. The concept of fractals, used for the quantitative description of the dissipative structure of the tribojunction zone, makes it possible to establish a connection between its fractal dimension and mechanical properties, as well as critical states of deformation of metals and alloys. The course of research and stages of fractal modeling, the classification of methods of fractal analysis of the structure of engineering contact surfaces are considered. A critical analysis of modern models based on the energy-spectral density function, which are quite similar to fractal models, is presented. Readers are expected to gain an overview of research developments in existing modeling methods and directions for future research in the field of tribology Materials science ; Nanotechnology Metal Alloys Wear and Properties ; Engineering Technology and Methodologies ; Advanced machining processes and optimization
Authors: Salmah Aminati | Gani Purwiandono
Source: IJCER (International Journal of Chemistry Education Research) (article, 2024-10-16)
Field: Chemistry — Physical and Theoretical Chemistry

Enhancing Learning Interest in the Collaborative Learning Practitioner Lecture: Training on Determining the Viscosity of Palm Kernel Oil (PKO) This study aims to determine the effects in physical chemistry class with the workshop sessions on measuring PKO viscosity by CV. Bina Agro Mandiri. The effects are evaluated through the enhancing of student's learning interest in the Physical Chemistry II class in Chemistry Program of the Islamic University of Indonesia, which presents a good avenue for this investigation. The study was conducted by classroom, practical and online action. The data were analyzed using a pie chart. Findings showed that the implementation of the practical was able to increase the student's learning interests. Through case analysis tasks, students participate significantly in the teaching-learning process. Palm kernel oil ; Palm oil ; Kernel (algebra) ; Collaborative learning ; Computer science ; Agricultural engineering ; Psychology ; Environmental science ; Mathematics education ; Mathematics ; Agroforestry ; Engineering Various Chemistry Research Topics
Authors: Yu Liu | Hongtao Gu | Bin Zhao | Zhiyi Leng | Jian Yin | Shengfang Zhang
Source: Advances in Engineering Technology Research (article, 2024-01-02)
Field: Materials Science — Materials Chemistry

Fatigue Life Analysis of Hydrogen Production Reactor Welds Under Thermal-mechanical-chemical Coupling Hydrogen production reactor are subject to performance degradation problems in the complex environment of high temperature, high pressure and exposed to hydrogen atmosphere. The welds, being weak parts, are susceptible to fatigue damage under the influence of loads such as temperature, pressure and hydrogen penetration. In this paper, we focus on the fatigue life analysis of welds in hydrogen production reactor, taking into account the complex working conditions of thermal-mechanical-chemical coupling. Based on the Fe-safe fatigue analysis software, the stress variation of the welds under multi-field coupling was used as a cyclic load and the fatigue life was predicted using the stress-life method. Respectively, the fatigue life variation law of the weld region was studied at different temperatures, pressures, and hydrogen penetration conditions. The results show that the lowest fatigue life of the welds are concentrated in the vicinity of the fusion zone, with hydrogen penetration and temperature variations having a larger impact on the fatigue life, followed by pressure. Hydrogen ; Coupling (piping) ; Hydrogen production ; Materials science ; Thermal ; Thermal fatigue ; Production (economics) ; Nuclear engineering ; Metallurgy ; Chemistry ; Engineering ; Thermodynamics ; Physics ; Organic chemistry Material Properties and Failure Mechanisms ; Fatigue and fracture mechanics ; Engineering Diagnostics and Reliability
Source: Materialwissenschaft und Werkstofftechnik (article, 2024-01-01)
Field: Materials Science — General Materials Science

Materialwiss. Werkstofftech. 1/2024 With carbon increasing, carbide precipitation is observed along the grain boundaries, resulting in micro-cracks formation with poor plastic capacity.Meanwhile, the carbon addition significantly improves the tensile and cupping force of the investigated materials, but at 1.0 at % carbon addition deteriorates the plastic capacity. The effect of carbon addition on the mechanical properties and fracture behaviors of cobaltchromium-ironmanganese-nickel high entropy alloyAuswirkung von Kohlenstoff auf die mechanischen Eigenschaften und das Bruchverhalten von Kobalt-Chrom-Eisen-Mangan-Nickel-Legierungen mit hoher Entropie Materials science ; Composite material Material Properties and Applications
Authors: S.Y. Noskova | Станислав Сухих | Lyubov Dyshlyuk | Oksana Ivina
Source:  (article, 2024-12-19)
Field: Chemistry — Inorganic Chemistry

ANALYSIS OF ALLERGENICITY AND HEPATOTOXICITY OF ENZYMATIC HYDROLYSATES OF COCONUT OIL The collection includes scientific articles of participants of the International University Science Forum, the purpose of which is to present significant results of scientific research in the field of humanities, natural and technical sciences; the formation of a modern level of scientific knowledge, experience in transformation of theoretical science into the sphere of practical application of innovations; generalization of research and practical experience.The forum is a tool for establishing sustainable ties, as well as the exchange of experience between teachers and researchers of universities and research organizations.Le recueil comprend des articles scientifiques des participants du Forum Scientifique International des Universits, dont l'objectif est la prsentation des rsultats significatifs de la recherche dans le domaine des sciences humaines, de la nature et de l'ingnieur; la formation du niveau contemporain des connaissances scientifiques, de l'exprience de la transformation de la science thorique au champ de l'application pratique des innovations; la synthse de l'exprience des recherches scientifiques et pratiques.Le forum est un instrument permettant d'tablir des liens durables et d'changer des donnes d'exprience entre les enseignants et les chercheurs des universits et les organisations scientifiques. Coconut oil ; Chemistry ; Enzyme ; Hydrolysate ; Biotechnology ; Chromatography ; Food science ; Biochemistry ; Biology ; Hydrolysis Coconut Research and Applications ; Fatty Acid Research and Health
Authors: O.R. Minaeva
Source:  (article, 2024-12-19)
Field: Chemistry — Organic Chemistry

ÉVALUATION DE LA TENEUR EN SUBSTANCES BIOLOGIQUEMENT ACTIVES DANS LES MATIÈRES PREMIÈRES FRAÎCHES DE CASSIS (RÍBES NÍGRUM) The collection includes scientific articles of participants of the International University Science Forum, the purpose of which is to present significant results of scientific research in the field of humanities, natural and technical sciences; the formation of a modern level of scientific knowledge, experience in transformation of theoretical science into the sphere of practical application of innovations; generalization of research and practical experience.The forum is a tool for establishing sustainable ties, as well as the exchange of experience between teachers and researchers of universities and research organizations.Le recueil comprend des articles scientifiques des participants du Forum Scientifique International des Universits, dont l'objectif est la prsentation des rsultats significatifs de la recherche dans le domaine des sciences humaines, de la nature et de l'ingnieur; la formation du niveau contemporain des connaissances scientifiques, de l'exprience de la transformation de la science thorique au champ de l'application pratique des innovations; la synthse de l'exprience des recherches scientifiques et pratiques.Le forum est un instrument permettant d'tablir des liens durables et d'changer des donnes d'exprience entre les enseignants et les chercheurs des universits et les organisations scientifiques. Chemistry Edible Oils Quality and Analysis
Authors: Xiaohua Li | Xu Han | Zhongchuan Han | Meiying Xue | Ruilin Pei
Source: IEICE Electronics Express (article, 2024-11-10)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Analysis of vibration characteristics of amorphous alloy permanent magnet synchronous motor considering magnetostriction effect In comparison to silicon steel sheet motors, utilizing amorphous alloys for the motor core can enhance motor efficiency; however, their significant magnetostriction must be taken into account. Given the high magnetostriction of core materials, it is crucial to consider the impact of magnetostriction on motor vibrations. This paper initially derives the equivalent magnetostriction force and electromagnetic force based on an analytical model. By analyzing the magnetization curve and hysteresis strain curve, the radial magnetostriction force and electromagnetic force at the stator teeth of the amorphous alloy motor are examined using Ansys software. Subsequently, a broadband “electromagnetic-force-structure” multiphysics model of the amorphous alloy prototype is established to obtain the vibration characteristics of the prototype, and the spectral characteristics of magnetostrictive and electromagnetic force vibrations in the amorphous alloy motor are analyzed. Finally, the vibration characteristics of an 18-slot 4-pole amorphous alloy experimental prototype are experimentally measured and numerically analyzed. The study reveals that the magnetostriction effect exacerbates motor vibrations, although the primary source of vibration remains the electromagnetic force. Magnetostriction ; Vibration ; Materials science ; Magnet ; Permanent magnet synchronous motor ; Alloy ; Amorphous solid ; Amorphous metal ; Acoustics ; Automotive engineering ; Metallurgy ; Mechanical engineering ; Physics ; Engineering ; Magnetic field ; Chemistry ; Crystallography Magnetic Properties and Applications ; Metallic Glasses and Amorphous Alloys
Authors: G.S. Aliyev | Kh. M. Rustamli | Gunay Guliyeva | Ivanov I.A. | I.V. Ahmadova
Source:  (article, 2024-12-19)
Field: Chemistry — Organic Chemistry

STUDYING THE REGULARITIES OF THE CATALYTIC GAS-PHASE OXIDATION PROCESS OF METHANOL TO FORMIC ACIDi Methanol ; Formic acid ; Gas phase ; Catalysis ; Chemical engineering ; Process (computing) ; Process engineering ; Chemistry ; Materials science ; Computer science ; Organic chemistry ; Engineering Inorganic and Organometallic Chemistry ; Chemical Synthesis and Reactions ; Thermal and Kinetic Analysis
Authors: Tao Chen | Gaogang Xie | S. Zhang
Source: Optics and Precision Engineering (article, 2024-01-01)
Field: Chemistry — Analytical Chemistry

Application of terahertz fusion spectrum combined with improved fused lasso model in identification of transgenic rapeseed oil 现有基于单一光谱的转基因菜籽油分类鉴别模型，存在包含信息少、数据维度高等问题，导致模型运行效率较低、检测结果不够准确。针对此问题，本研究提出一种太赫兹融合光谱结合改进Fused Lasso模型的转基因菜籽油分类鉴别方法。以两种转基因菜籽油和两种非转基因菜籽油为研究对象，应用太赫兹时域光谱（THz-TDS）系统获取4种菜籽油样品在0.2~1.6 THz频率范围内的太赫兹吸收光谱，采用连续投影（SPA）算法对样品的太赫兹吸收光谱和导数光谱进行特征提取后再融合，引入特征选择和分类为一体的正则化稀疏模型Fused Lasso，通过采用一对一（OVO）方法将其改进为多分类模型并采用贝叶斯优化（BO）算法对其正则化参数寻优。结果表明，相比传统基于单一吸收光谱的Fused Lasso模型，基于融合光谱的BO-Fused Lasso模型对4种菜籽油分类效果更好，其训练集准确率为96.88%，测试集准确率为95.00%。因此，本研究为转基因菜籽油和非转基因菜籽油的鉴别提供了一种新方法，也为其他转基因物质鉴别提供了有价值的参考。 Rapeseed ; Lasso (programming language) ; Terahertz radiation ; Computational biology ; Spectrum (functional analysis) ; Identification (biology) ; Transgene ; Biological system ; Biology ; Computer science ; Artificial intelligence ; Biotechnology ; Genetics ; Materials science ; Optoelectronics ; Botany ; Physics ; Gene Spectroscopy and Chemometric Analyses ; Advanced Chemical Sensor Technologies ; Identification and Quantification in Food
Authors: Chenyue Wang
Source: Science and Technology of Engineering Chemistry and Environmental Protection (article, 2024-11-12)
Field: Materials Science — Materials Chemistry

The systematic analysis of present situation and future development of semiconductor. Semiconductor has a property between conductor and insulator. The property is caused by the different structure of the p-type and n-type material in the semiconductor, which only allows the current to travel in one direction. Because of this special property, semiconductor is used to design many different devices. Solar panel is an important technology to reduce pollution to the environment, with the energy generated by sunlight, the demand to fossil fuels will decrease. Therefore, global warming and air pollution will be solved by this solar panel technology. Wafer is also an important technology. It is widely used in computer and smart phones to processing complex information, many communications technology have a large demand on wafer. LED is a lighting device; its color and brightness is depended on the structure and material of semiconductor. There are many challenges and limitations in recent semiconductor industry, including its low efficiency in different scenario and high cost in production. In future, the need to semiconductor will increase a lot, like the 5G station and electric cars. The limitations of semiconductor are very important to solve by design new structure and new materials. Semiconductor will largely change the development in future technology. Solar energy ; Property (philosophy) ; Semiconductor device fabrication ; Air pollution ; Fossil fuel ; Energy (signal processing) ; Photovoltaic system ; Materials processing Advanced Materials and Semiconductor Technologies ; Chemical and Physical Properties of Materials ; Silicon and Solar Cell Technologies
Authors: Shubham Kumar | Sarmistha Sarkar | Biman Bagchi
Source: arXiv (Cornell University) (preprint, 2024-03-28)
Field: Materials Science — Materials Chemistry

Glassy Dynamics in a Molecular Liquid A universal dynamical crossover temperature, Tcr, in glassy liquids, associated with the α-\b{eta} bifurcation temperature, TB, has been observed in dielectric spectroscopy and other experiments. Tcr lies significantly above the glass transition temperature. Here, we introduce a new class of glass-forming liquids, binary mixtures of prolate and oblate ellipsoids. This model system exhibits sharp thermodynamic and dynamic anomalies, such as the specific heat jump during heating and a sharp variation in the thermal expansion coefficient around a temperature identified as the glass transition temperature, Tg. The same temperature is obtained from the fit of the calculated relaxation times to the Vogel-Fulcher-Tammann (VFT) form. As the temperature is lowered, the single peak rotational relaxation spectrum splits into two at a temperature TB significantly above the estimated Tg. Similar bifurcation is also observed in the distribution of short-to-intermediate time translational diffusion. Interrogation of the two peaks reveals a lower extent of dynamic heterogeneity in the population of the faster mode. We observe an unexpected appearance of a sharp peak in the product of rotational relaxation time τ2 and diffusion constant D at a temperature Tcr, close to TB, but above the glass transition temperature. Additionally, we coarse-grain the system into cubic boxes, each containing, on average, ~62 particles, to study the average dynamical properties. Clear evidence of large-scale sudden changes in the diffusion coefficient and rotational correlation time signals first-order transitions between low and high-mobility domains. Molecular dynamics ; Dynamics (music) ; Materials science ; Statistical physics ; Chemical physics ; Nanotechnology ; Psychology ; Chemistry ; Physics ; Computational chemistry Material Dynamics and Properties ; Thermodynamic properties of mixtures ; Liquid Crystal Research Advancements
Authors: E.G. Iskenderov | V. I. Dvoryanchikov | Y.A. Dibirov
Source:  (article, 2024-12-24)
Field: Materials Science — Materials Chemistry

THERMAL ANALYSIS METHOD FOR THE STUDY OF CONDENSED MATTER The economies of various countries around the world today are based on the continuous creation and commissioning of modern, new technologies based on the results of scientific and technological progress.High-tech potential has become a prerequisite for ensuring a high level of competitiveness of the economy of any state.In this regard, countries are actively funding research, as well as encouraging individuals to invest in R&D.One can definitely say that one of the achievements of fundamental science in the XX century is the discovery that allows you to find new perspectives by identifying various patterns, and, most importantly, serve as the basis for the subsequent creation of various inventions, models or designs.For modern Russia, one of the key barriers to the transition to a postindustrial, innovative economy is imperfect legislation in the field of registration of scientific discoveries and obtaining further patents for the results of intellectual activity.As an alternative to solving this problem, we propose the project "legislation unification on registration of scientific discovers and intellectual properties as a reserve for economic growth Process Management and Scientific Developments Computer science ; Environmental science Thermal and Kinetic Analysis ; Chemical Thermodynamics and Molecular Structure ; Graphite, nuclear technology, radiation studies
Authors: Yudai Tasaki | Takafumi Narukawa | Yutaka Udagawa
Source: Journal of Nuclear Science and Technology (article, 2024-02-29)
Field: Materials Science — Materials Chemistry

Bayesian statistical model for cladding high-temperature burst under loss-of-coolant accident conditions This study developed a probabilistic determination model with respect to cladding high-temperature burst conditions based on the Bayesian statistical method to reasonably evaluate fuel behaviors under loss-of-coolant accident conditions, including fuel fragmentation, relocation, and dispersal. The candidate models (correlations) were based on the widely accepted empirical model established based on nonirradiated fuel cladding data. Explanatory variables were added to improve the applicability of these models with respect to irradiated materials and generalization performance. The posterior predictive distribution of each candidate model was evaluated using Bayesian estimation comprising 238 sets of high-temperature burst test data. The generalization performance was evaluated using information criteria. The results of model evaluation showed improved predictive performance by considering the effect of hydrogen content. A comparison with burnup as an alternative explanatory variable confirmed that hydrogen content was the better parameter and other burnup-associated effects, such as irradiation hardening of the metal matrix and oxide growth (reduction of the metal matrix), were less dominant under burst conditions. Burnup ; Bayesian probability ; Materials science ; Nuclear engineering ; Statistics ; Mathematics ; Engineering Nuclear Materials and Properties ; Nuclear reactor physics and engineering ; Nuclear and radioactivity studies
Authors: Yasheni Raman | Johari Surif | Nor Hasniza Ibrahim
Source: International Journal of Interactive Mobile Technologies (iJIM) (article, 2024-03-05)
Field: Chemistry — Physical and Theoretical Chemistry

Alternative Framework in Electrochemistry among Secondary Schools Students in Johor, Malaysia The presence of an alternative framework in the students’ minds acts as the main hindrance to students exhibiting profound understanding of scientific concepts, which in turn promotes the application of scientific knowledge to solve daily life context problems. This research is done in two phases. In the first phase, the research aims to identify the alternative framework among students on the concept of electrochemistry, and in the second phase, it develops an instructional module for secondary school students on the concept of electrochemistry by using the five-phase Needham constructivism model approach to overcome the alternative framework that exists in the students’ minds. In this paper, however, only the findings of the first phase are reported. The instrument used for this study is the electrochemistry test developed based on previous research and validated by experts. This paper and pencil test is used in the first phase of the research as a data collection tool. This research adapted a quantitative research design. The data from the electrochemistry test is analyzed using statistical packages for social sciences (SPSS) 20.0 to get the descriptive data as findings of the first phase of the study. The findings of the first phase of this study indicate that the conceptualization level of students in electrochemistry is poor. Multiple alternative frameworks among students were identified from the analysis of the students’ responses. This study contributed to existing literature by identifying the alternative frameworks present precisely in electrochemistry. The study recommends incorporating mobile technologies in the data collection process and in developing online instructional modules to be more accessible to educators throughout the country and to steer the chemistry education world to a higher level in the Malaysian education system. Enlightening the alternative framework existent in the students’ knowledge schemata immensely facilitates educators worldwide in planning their instructional approach in the classroom for this specific scientific concept. Mathematics education ; Geography ; Psychology Various Chemistry Research Topics ; Education and Islamic Studies