Results 101 to 110 of about 76,108 (299)

Proof in dynamic geometry contexts

, 1998
Proof lies at the heart of mathematics yet we know from research in mathematics education that proof is an elusive concept for many mathematics students.
Hoyles, Celia, Jones, Keith
core  

What is the Value of Geometric Models to Understand Matter? [PDF]

, 2015
This article analyzes the value of geometric models to understand matter with the examples of the Platonic model for the primary four elements (fire, air, water, and earth) and the models of carbon atomic structures in the new science of crystallography.
Monnoyeur, Francoise
core  

Students' Critical Thinking in Solving Geometric Problems

PRISMA
In the 21st century, students are expected to have abilities that are considered important to face challenges.One of the goals of the education system is to educate students to think critically. The purpose of this research is to determine the extent to which researchers analyze students' critical thinking abilities, especially in solving geometry ...
Anastia, Anastia, Nurcahyono, Novi Andri, Setiani, Ana   +2 more
openaire   +2 more sources

Thermophysical Properties of the Desulphurization Slags With Various CaS and CaO/Al2O3 Ratio

Advanced Engineering Materials, EarlyView.
This article investigates how CaS content and the CaO/Al2O3 ratio influence the thermophysical properties of desulphurization slags. Using experimental measurements and thermodynamic simulations, this study reveals complex effects on viscosity, surface tension, and density, providing new insight into slag structure and phase behavior under ...
Eldar Salpagarov, Matheus Roberto Bellé, Anton Yehorov, Julia Richter, Olena Volkova   +4 more
wiley   +1 more source

Geometrization of Quantum Mechanics

, 2007
We show that it is possible to represent various descriptions of Quantum Mechanics in geometrical terms. In particular we start with the space of observables and use the momentum map associated with the unitary group to provide an unified geometrical ...
A. Ashtekar, A. Bloch, A. Heslot, D. Brody, D. J. Rowe, E. Segal, F. Strocchi, G. G. Emch, G. Marmo, G. Marmo, J. Clemente-Gallardo, J. F. Cariñena, J. Grabowski, J. Grabowski, L. J. Boya, M. C. Abbati, N. P. Landsman, P. A. M. Dirac, P. Jordan, R. Cirelli, R. Cirelli, R. Haag, T. R. Field, V. I. Man’ko, V. I. Man’ko, V. I. Man’ko   +25 more
core   +1 more source

Population of Nonmetallic Inclusions in Liquid High‐Silicon Electrical Steel in Contact With MgO–C Refractories Based on Recyclates and Environmentally Friendly Binders

Advanced Engineering Materials, EarlyView.
The formation of nonmetallic inclusions (NMIs) was investigated in this study, carrying out immersion tests for 30 min at a temperature of 1600°C with liquid high‐silicon electrical steel (Si ≈ 3 mass‐%) and different MgO–C refractories. Conventional MgO–C refractories were considered, as well as MgO–C refractories containing MgO–C recyclate and ...
Lukas Neubert, Matheus Roberto Bellé, Florian Kerber, Dinesh Kumar Gunasekar, Hans‐Jörn Weddige, Christos G. Aneziris, Olena Volkova   +6 more
wiley   +1 more source

Structural Course of Surah in the Interpretations of the Holy Quran [PDF]

آموزه‌های قرآنی, 2020
The division of the Holy Quran into chapters is based on divine wisdom, and attention to it has existed since the beginning of the revelation, as well as in the teachings of the Holy Prophet (PBUH) and the “People of the Household” (AS), with ...
Abolfazl Khoshmanesh, Fatemeh Aliyan Nezhadi   +1 more
doaj  

Geometrical construction task as an effective source of 21st century skills training [PDF]

, 2017
У статті розкрито сутність поняття навичок ХХІ століття як педагогічного феномену. Виділено три блоки навичок: навчальні та інноваційні; інформаційні, медійні та комп’ютерні; життєві і професійні (кар’єрні).
Астаф'єва, Марія Миколаївна, Прошкін, Володимир Вадимович   +1 more
core  

Dynamic Testing of Cold Gas Sprayed Bipolar Plates–Porous Transport Layer Coating System in Proton Exchange Membrane Water Electrolysis

Advanced Engineering Materials, EarlyView.
Through direct application of porous transport layer (PTL) on the bipolar plate (BPP) with thermal spraying, the interfacial contact resistance is improved. With the cold gas sprayed BPP–PTL coating system, a proton exchange membrane water electrolysis cell with a cell voltage of Ucell = 1.9 V can be operated up to i = 2.5 A/cm2 in a dynamic mode ...
Kirsten Bobzin, Marvin Erck, Kevin Jasutyn, Katja Radermacher, Andreas Bund, Mario Kurniawan   +5 more
wiley   +1 more source

Productivity‐Driven Optimization of Laser Powder Bed Fusion Parameters for IN718 Superalloy: Process Control, Microstructure, and Mechanical Properties

Advanced Engineering Materials, EarlyView.
This study demonstrates how optimizing laser power, scanning speed, and hatching distance in laser powder bed fusion can boost the productivity of Inconel 718 manufacturing by up to 29% while maintaining mechanical integrity. The work delivers a validated process window and cost–time analysis, offering industry‐ready guidelines for efficient additive ...
Amir Behjat, Guido Barale, John Stavridis, Ehsan Norouzi, Jin‐Yoo Suh, Dong‐Ik Kim, Luca Iuliano, Abdollah Saboori   +7 more
wiley   +1 more source