Results 41 to 50 of about 2,144,567 (140)

Estudio de las propiedades mecánicas de aceros HSLA de bajo contenido en carbono

Revista de Metalurgia, 2009
Se han estudiado dos aceros HSLA (high strength low alloy) que presentan composiciones similares, a excepción del contenido en elementos microaleantes. El propósito del estudio es determinar el efecto del tratamiento térmico y la influencia del contenido
S. Illescas, J. Fernández, J. Asensio, M. Sánchez-Soto, J. M. Guilemany   +4 more
doaj   +1 more source

Monolithic and Staggered Solution Strategies for Constrained Mechanical Systems in Optimal Control Problems

International Journal for Numerical Methods in Engineering, Volume 126, Issue 6, 30 March 2025.
ABSTRACT This paper deals with the optimal control of constrained mechanical systems, with potential additional kinematic constraints at the final time. Correspondingly, the equations of motion of the underlying mechanical system assume the form of differential‐algebraic equations with end constraints.
Ashutosh Bijalwan, Simeon Schneider, Peter Betsch, José J Muñoz   +3 more
wiley   +1 more source

Enhancement in evaluating small group work in courses with large number of students. Machine theory at industrial engineering degrees

Journal of Technology and Science Education, 2013
This article examines new tutoring evaluation methods to be adopted in the course, Machine Theory, in the Escola Tècnica Superior d’Enginyeria Industrial de Barcelona (ETSEIB, Universitat Politècnica de Catalunya).
Lluïsa Jordi Nebot, Rosa Pàmies-Vilà, Pau Català Calderón, Joan Puig-Ortiz   +3 more
doaj   +1 more source

Pulsed-Temperature Metal Oxide Gas Sensors for Microwatt Power Consumption

IEEE Access, 2020
Metal Oxide (MOX) gas sensors rely on chemical reactions that occur efficiently at high temperatures, resulting in too-demanding power requirements for certain applications.
Francisco Palacio, Jordi Fonollosa, Javier Burgues, Jose M. Gomez, Santiago Marco   +4 more
doaj   +1 more source

On the Thermal Models for Resistive Random Access Memory Circuit Simulation

Nanomaterials, 2021
Resistive Random Access Memories (RRAMs) are based on resistive switching (RS) operation and exhibit a set of technological features that make them ideal candidates for applications related to non-volatile memories, neuromorphic computing and hardware ...
Juan B. Roldán, Gerardo González-Cordero, Rodrigo Picos, Enrique Miranda, Félix Palumbo, Francisco Jiménez-Molinos, Enrique Moreno, David Maldonado, Santiago B. Baldomá, Mohamad Moner Al Chawa, Carol de Benito, Stavros G. Stavrinides, Jordi Suñé, Leon O. Chua   +13 more
doaj   +1 more source

Machine learning in solid mechanics: Application to acoustic metamaterial design

International Journal for Numerical Methods in Engineering, Volume 125, Issue 14, 30 July 2024.
Abstract Machine learning (ML) and Deep learning (DL) are increasingly pivotal in the design of advanced metamaterials, seamlessly integrated with material or topology optimization. Their intrinsic capability to predict and interconnect material properties across vast design spaces, often computationally prohibitive for conventional methods, has led to
D. Yago, G. Sal‐Anglada, D. Roca, J. Cante, J. Oliver   +4 more
wiley   +1 more source

Replication of nanoscale surface gratings via injection molding

Micro and Nano Engineering, 2019
Nanostructured gratings fabricated on silicon chips have been successfully transferred to polypropylene plastic parts by means of injection molding. Different sets of experiments were carried out along with a repeatability analysis in order to study the ...
Olga Muntada-López, Jordi Pina-Estany, Carles Colominas, Jordi Fraxedas, Francesc Pérez-Murano, Andres García-Granada   +5 more
doaj   +1 more source

Enhanced Selective Contact Behavior in a‐Si:H/oxide Transparent Photovoltaic Devices via Dipole Layer Integration

Solar RRL, Volume 8, Issue 14, July 2024.
Herein, ultrathin a‐Si:H/oxide transparent photovoltaic devices are presented with notable improvement in efficiency given by a strong increase in open‐circuit voltage (Voc) thanks to the addition of dipolar interfacial layers at the electron‐transport layer based on poly(amidoamine) and polyethyleneimine.
Alex J. Lopez‐Garcia, Gustavo Alvarez‐Suarez, Eloi Ros, Pablo Ortega, Cristobal Voz, Joaquim Puigdollers, Alejandro Pérez Rodríguez   +6 more
wiley   +1 more source

A Mathematical Model for the Scheduling of Virtual Microgrids Topology into an Active Distribution Network

Applied Sciences, 2020
This article presents a method based on a mathematical optimization model for the scheduling operation of a distribution network (DN). The contribution of the proposed method is that it permits the configuration and operation of a DN as a set of virtual ...
Fernando García-Muñoz, Francisco Díaz-González, Cristina Corchero   +2 more
doaj   +1 more source

Semitransparent Wide Bandgap Cu2ZnGe(S,Se)4 Thin‐Film Solar Cells: Role of the Sulfurization Process

Solar RRL, Volume 8, Issue 4, February 2024.
Efficient semitransparent Cu2ZnGe(S,Se)4 thin‐film solar cells with performance of 3.1% and 2.7 % and Eg = 1.73 and 1.86 eV are fabricated. The reduction of the absorber thickness to 400 nm results in a higher transparency of ≈40% in the near‐infrared, but also in lower devices efficiency because of the different back‐interface and ZnS phase formation.
Andrea Ruiz‐Perona, David Palma‐Lafuente, Yudania Sánchez, Maxim Guc, Tim Kodalle, Mohamed Ould Salem, Marcel Placidi, Rosalia Serna, Alejandro Pérez‐Rodríguez, José Manuel Merino, Raquel Caballero   +10 more
wiley   +1 more source