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Dr. Efrén Diez-Jimenez
Mechanic engineering area, Universidad de Alcalá

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0 Mechanisms
0 Mechanical design
0 Micromotors
0 Microrobotics
0 magnetic gear

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magnetic gear
Mechanical design

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Journal article
Published: 05 May 2021 in Sensors
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Decision-making is an important part of human life and particularly in any engineering process related to a complex product. New sensors and actuators based on MEMS technologies are increasingly complex and quickly evolving into products. New biomedical implanted devices may benefit from system engineering approaches, previously reserved to very large projects, and it is expected that this need will increase in the future. Here, we propose the application of Model Based Systems Engineering (MBSE) to systematize and optimize the trade-off analysis process. The criteria, their utility functions and the weighting factors are applied in a systematic way for the selection of the best alternative. Combining trade-off with MBSE allow us to identify the more suitable technology to be implemented to transfer energy to an implanted biomedical micro device.

ACS Style

Juan Martínez Rojas; José Fernández; Rocío Sánchez Montero; Pablo López Espí; Efren Diez-Jimenez. Model-Based Systems Engineering Applied to Trade-Off Analysis of Wireless Power Transfer Technologies for Implanted Biomedical Microdevices. Sensors 2021, 21, 3201 .

AMA Style

Juan Martínez Rojas, José Fernández, Rocío Sánchez Montero, Pablo López Espí, Efren Diez-Jimenez. Model-Based Systems Engineering Applied to Trade-Off Analysis of Wireless Power Transfer Technologies for Implanted Biomedical Microdevices. Sensors. 2021; 21 (9):3201.

Chicago/Turabian Style

Juan Martínez Rojas; José Fernández; Rocío Sánchez Montero; Pablo López Espí; Efren Diez-Jimenez. 2021. "Model-Based Systems Engineering Applied to Trade-Off Analysis of Wireless Power Transfer Technologies for Implanted Biomedical Microdevices." Sensors 21, no. 9: 3201.

Research article
Published: 07 April 2021 in Computer Applications in Engineering Education
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Over decades, Mechanical Engineering students often find some difficulties to grasp some contents and/or struggle with some parts of the course. With the increasing development of new technologies, promising innovations can be implemented enhancing learning and improving success rates. In this study, a new learning interactive method is proposed and evaluated using the experience of over 600 students of Mechanical Engineering. This study describes a 4‐year experiment based on new interactive applications for education. The experiment has been implemented using E‐learning techniques and new technologies (a combination of remote and virtual examples, videos, quizzes, and theory). Specifically, several applications have been programmed to be executed on different devices, such as mobile phones and PC/laptops (Android and Windows). The experiment is applied using small applications that help the students identify the most challenging contents and guide them throughout step‐by‐step. The main objective of this interactive method is to help students find their lack of knowledge and offer them contents to cover it. These didactic applications are portable and intuitive. Thanks to these interactive applications, it is possible to accomplish better practices of “E‐learning” and “Computer Simulation and Animation” together. Since they are portable applications, they allow the student to interact and check conceptual understandings at any place. Students really appreciate this aspect. The results of the course titled Mechanism and Machine Theory have been analyzed during these four last years in which these interactive applications have been offered to the students.

ACS Style

Eduardo Corral Abad; María J. Gómez García; Efren Diez‐Jimenez; Pedro M. Moreno‐Marcos; Cristina Castejón Sisamon. Improving the learning of engineering students with interactive teaching applications. Computer Applications in Engineering Education 2021, 1 .

AMA Style

Eduardo Corral Abad, María J. Gómez García, Efren Diez‐Jimenez, Pedro M. Moreno‐Marcos, Cristina Castejón Sisamon. Improving the learning of engineering students with interactive teaching applications. Computer Applications in Engineering Education. 2021; ():1.

Chicago/Turabian Style

Eduardo Corral Abad; María J. Gómez García; Efren Diez‐Jimenez; Pedro M. Moreno‐Marcos; Cristina Castejón Sisamon. 2021. "Improving the learning of engineering students with interactive teaching applications." Computer Applications in Engineering Education , no. : 1.

Journal article
Published: 02 January 2021 in Actuators
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We present the design, manufacturing, and dynamical characterization of a mechanical suspension made by a passive magnetic spring and an eddy current damper integrated into a single device. Three configurations with 2, 3, and 4 permanent magnets axially distributed with opposite polarizations are designed, simulated, manufactured, and tested. Stiffness of 2410, 2050, 2090 N/m and damping coefficient of 5.45, 10.52 and 17.25 Ns/m are measured for the 2-, 3-, and 4-magnets configurations, respectively. The magnetic suspension provides good mechanical properties combined with excellent cleanness and high reliability, which is very desirable in mechanical systems for space applications.

ACS Style

Efren Diez-Jimenez; Cristina Alén Cordero; Roberto Alcover-Sánchez; Eduardo Corral-Abad. Modelling and Test of an Integrated Magnetic Spring-Eddy Current Damper for Space Applications. Actuators 2021, 10, 8 .

AMA Style

Efren Diez-Jimenez, Cristina Alén Cordero, Roberto Alcover-Sánchez, Eduardo Corral-Abad. Modelling and Test of an Integrated Magnetic Spring-Eddy Current Damper for Space Applications. Actuators. 2021; 10 (1):8.

Chicago/Turabian Style

Efren Diez-Jimenez; Cristina Alén Cordero; Roberto Alcover-Sánchez; Eduardo Corral-Abad. 2021. "Modelling and Test of an Integrated Magnetic Spring-Eddy Current Damper for Space Applications." Actuators 10, no. 1: 8.

Journal article
Published: 02 May 2020 in Energies
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In this work, we describe the design and test of a new piece of equipment, developed in order to enhance speed, gas consumption and safety during the manual asphalt roofing process. The novelty of the equipment is based on the use of a set of five parallel gas burners located in front of the roll to maximize heat transfer. The equipment is light and can be used by any worker on any type of roof. It also includes a thermal insulation cover to significantly reduce gas consumption and, thus, to reduce CO2, SO2, and other non-eco-friendly emissions. In this paper, we present the mechanical and thermal design and analysis of the equipment, Computer Fluid Dynamics (CFD) simulations for heat transfer calculation, a description of the manufacturing and assembly, a preliminary thermal test, and an operational test. The results demonstrate an installation speed of 1.75 m2/min, for 3 kg/m2 rolls, which translates to around 700–735 m2 per person per day, more than twice the usual manual roofing rate. Nevertheless, some issues need to be resolved, such as the nonuniform heat distribution and the low heat transfer at the end of the roll installation.

ACS Style

Alberto Barragán-García; Miguel Fernández-Muñoz; Efrén Díez-Jiménez. Lightweight Equipment Using Multiple Torches for Fast Speed Asphalt Roofing. Energies 2020, 13, 2216 .

AMA Style

Alberto Barragán-García, Miguel Fernández-Muñoz, Efrén Díez-Jiménez. Lightweight Equipment Using Multiple Torches for Fast Speed Asphalt Roofing. Energies. 2020; 13 (9):2216.

Chicago/Turabian Style

Alberto Barragán-García; Miguel Fernández-Muñoz; Efrén Díez-Jiménez. 2020. "Lightweight Equipment Using Multiple Torches for Fast Speed Asphalt Roofing." Energies 13, no. 9: 2216.

Journal article
Published: 09 April 2020 in Journal of Tribology
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Linear bushings are a compact and reliable solution for mechanisms requiring relative linear displacement between moving parts. In this paper, we report the dependence of the coefficient of friction (COF) of polytetrafluoroethylene (PTFE) grease-lubricated bushings against a Ti6Al4 V (grade 5) alloy shaft at high temperatures up to 200 °C, for a motion speed of up to 0.47 m/s and a load pressure of 0.8 MPa. A proportional sensitivity of the COF with temperature is observed due to the change in the viscosity of the grease lubricant. Results of survival tests are also reported demonstrating a total sliding distance of 3200 m without maintenance and a total a total sliding distance of 10,200 m without critical failure.

ACS Style

Ignacio Valiente-Blanco; Jose-Luis Perez-Diaz; Jose-Luis Perez Del Alamo; Efren Diez-Jimenez. Temperature Dependence of the Friction Coefficient of Grease-Lubricated PTFE Linear Bushings Against Titanium Grade 5 Alloy (Ti6Al4V) and Life Tests Operating at High-Speed. Journal of Tribology 2020, 142, 1 -16.

AMA Style

Ignacio Valiente-Blanco, Jose-Luis Perez-Diaz, Jose-Luis Perez Del Alamo, Efren Diez-Jimenez. Temperature Dependence of the Friction Coefficient of Grease-Lubricated PTFE Linear Bushings Against Titanium Grade 5 Alloy (Ti6Al4V) and Life Tests Operating at High-Speed. Journal of Tribology. 2020; 142 (9):1-16.

Chicago/Turabian Style

Ignacio Valiente-Blanco; Jose-Luis Perez-Diaz; Jose-Luis Perez Del Alamo; Efren Diez-Jimenez. 2020. "Temperature Dependence of the Friction Coefficient of Grease-Lubricated PTFE Linear Bushings Against Titanium Grade 5 Alloy (Ti6Al4V) and Life Tests Operating at High-Speed." Journal of Tribology 142, no. 9: 1-16.

Journal article
Published: 17 March 2020 in IEEE Transactions on Intelligent Transportation Systems
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We present an innovative personal rapid transit technology compatible with current metro infrastructures, named OPTIMOTUS. The key of this technology is that passengers can travel without stops, thus multiplying several times the effective travel speed. In metro lines with shorter separation between stations (< 1000 m) and for long travels (> 5 stations), passengers travel speed could be up to 3.5 times faster with OPTIMOTUS than with conventional metro trains. In addition, its implementation costs would be relatively low since the vehicles are designed to be compatible with current metro railways. However, there are still many open issues to be engineered before claiming the full viability of the technology.

ACS Style

Efren Diez-Jimenez; Miguel Fernandez-Munoz; Ruben Oliva-Dominguez; David Fernandez-Llorca; Miguel Angel Sotelo. Personal Rapid Transport System Compatible With Current Railways and Metros Infrastructure. IEEE Transactions on Intelligent Transportation Systems 2020, 22, 2891 -2901.

AMA Style

Efren Diez-Jimenez, Miguel Fernandez-Munoz, Ruben Oliva-Dominguez, David Fernandez-Llorca, Miguel Angel Sotelo. Personal Rapid Transport System Compatible With Current Railways and Metros Infrastructure. IEEE Transactions on Intelligent Transportation Systems. 2020; 22 (5):2891-2901.

Chicago/Turabian Style

Efren Diez-Jimenez; Miguel Fernandez-Munoz; Ruben Oliva-Dominguez; David Fernandez-Llorca; Miguel Angel Sotelo. 2020. "Personal Rapid Transport System Compatible With Current Railways and Metros Infrastructure." IEEE Transactions on Intelligent Transportation Systems 22, no. 5: 2891-2901.

Editorial
Published: 26 November 2019 in Shock and Vibration
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ACS Style

Efren Diez-Jimenez; Toshihiko Sugiura; Rocco Rizzo; Maria-Jesus Gómez-García; Andrew Fleming. Electromagnetic Techniques for Vibration Damping and Isolation. Shock and Vibration 2019, 2019, 1 -2.

AMA Style

Efren Diez-Jimenez, Toshihiko Sugiura, Rocco Rizzo, Maria-Jesus Gómez-García, Andrew Fleming. Electromagnetic Techniques for Vibration Damping and Isolation. Shock and Vibration. 2019; 2019 ():1-2.

Chicago/Turabian Style

Efren Diez-Jimenez; Toshihiko Sugiura; Rocco Rizzo; Maria-Jesus Gómez-García; Andrew Fleming. 2019. "Electromagnetic Techniques for Vibration Damping and Isolation." Shock and Vibration 2019, no. : 1-2.

Journal article
Published: 08 November 2019 in Energies
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A prototype for mechanizing the asphalt roofing process was developed. In this manuscript, we present the design, manufacturing, preliminary thermal test, and operation test of the equipment. The innovation is sustained by the use of infrared radiators instead of fuel burners. Infrared heaters provide optimal clean heat transfer to asphalt rolls in comparison to fuel burner automated systems since the latter generates a significant amount of CO2, SO2, and other non-ecofriendly emissions close to workers. Moreover, the equipment has several advantages with respect to manual installation, such as roofing capacity, cleanness, safety, uniformity, and environment-friendliness. It demonstrates an installation speed of 1 m/min, on average, for 3 kg/m2 rolls, which leads to around 400–420 m2 per person a day, more than the usual manual roofing rate. However, there are some issues that need to be resolved, such as inaccurate unrolling and/or bad adhesion gaps.

ACS Style

Efrén Díez-Jiménez; Alberto Vidal-Sánchez; Alberto Barragán-García; Miguel Fernández Muñoz; Ricardo Mallol-Poyato. Lightweight Equipment for the Fast Installation of Asphalt Roofing Based on Infrared Heaters. Energies 2019, 12, 4253 .

AMA Style

Efrén Díez-Jiménez, Alberto Vidal-Sánchez, Alberto Barragán-García, Miguel Fernández Muñoz, Ricardo Mallol-Poyato. Lightweight Equipment for the Fast Installation of Asphalt Roofing Based on Infrared Heaters. Energies. 2019; 12 (22):4253.

Chicago/Turabian Style

Efrén Díez-Jiménez; Alberto Vidal-Sánchez; Alberto Barragán-García; Miguel Fernández Muñoz; Ricardo Mallol-Poyato. 2019. "Lightweight Equipment for the Fast Installation of Asphalt Roofing Based on Infrared Heaters." Energies 12, no. 22: 4253.

Journal article
Published: 28 August 2019 in International Journal of Applied Electromagnetics and Mechanics
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ACS Style

Miriam Martinez-Muñoz; Efren Diez-Jimenez; Rocio Sanchez-Montero; Pablo Luis Lopez-Espi; Juan Antonio Martinez-Rojas. Analysis of the geometric parameters influence in PCB fixtures for 2D multipole magnetization patterning of thin layer micro-magnets. International Journal of Applied Electromagnetics and Mechanics 2019, 61, 59 -71.

AMA Style

Miriam Martinez-Muñoz, Efren Diez-Jimenez, Rocio Sanchez-Montero, Pablo Luis Lopez-Espi, Juan Antonio Martinez-Rojas. Analysis of the geometric parameters influence in PCB fixtures for 2D multipole magnetization patterning of thin layer micro-magnets. International Journal of Applied Electromagnetics and Mechanics. 2019; 61 (1):59-71.

Chicago/Turabian Style

Miriam Martinez-Muñoz; Efren Diez-Jimenez; Rocio Sanchez-Montero; Pablo Luis Lopez-Espi; Juan Antonio Martinez-Rojas. 2019. "Analysis of the geometric parameters influence in PCB fixtures for 2D multipole magnetization patterning of thin layer micro-magnets." International Journal of Applied Electromagnetics and Mechanics 61, no. 1: 59-71.

Review
Published: 20 August 2019 in Shock and Vibration
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Passive electromagnetic devices for vibration damping and isolation are becoming a real alternative to traditional mechanical vibration and isolation methods. These types of devices present good damping capacity, lower cost, null power consumption, and higher reliability. In this work, a state-of-the-art review has been done highlighting advantages and drawbacks, application fields, and technology readiness level of most recent developments. In addition, a general introductory section relates presents key considerations that any engineer, electrical or mechanical, needs to know for a deep comprehension and correct design of these types of devices.

ACS Style

Efren Diez-Jimenez; Rocco Rizzo; Maria Jesus Gomez; Eduardo Corral. Review of Passive Electromagnetic Devices for Vibration Damping and Isolation. Shock and Vibration 2019, 2019, 1 -16.

AMA Style

Efren Diez-Jimenez, Rocco Rizzo, Maria Jesus Gomez, Eduardo Corral. Review of Passive Electromagnetic Devices for Vibration Damping and Isolation. Shock and Vibration. 2019; 2019 ():1-16.

Chicago/Turabian Style

Efren Diez-Jimenez; Rocco Rizzo; Maria Jesus Gomez; Eduardo Corral. 2019. "Review of Passive Electromagnetic Devices for Vibration Damping and Isolation." Shock and Vibration 2019, no. : 1-16.

Journal article
Published: 02 August 2019 in Energies
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This paper proposes a novel cryogenic fluid cold plate designed for the testing of cryogenic space components. The cold plate is able to achieve cryogenic temperature operation down to −196 °C with a low liquid nitrogen (LN2) consumption. A good tradeoff between high rigidity and low thermal conduction is achieved thanks to a hexapod configuration, which is formed by six hinge–axle–hole articulations in which each linking rod bears only axial loads. Thus, there is not any stress concentration, which reduces the diameter of rod sections and reduces the rods’ thermal conduction. This novel design has a unique set of the following properties: Simple construction, low thermal conduction, high thermal inertia, lack of vibrational noise when cooling, isostatic structural behavior, high natural frequency response, adjustable position, vacuum-suitability, reliability, and non-magnetic. Additionally, the presented cold plate design is low-cost and can be easily replicated. Experimental tests showed that a temperature of at least −190 °C can be reached on the top surface of the cold plate with an LN2 consumption of 10 liters and a minimum vibration frequency of 115 Hz, which is high enough for most vibration tests of space components.

ACS Style

Efrén Díez-Jiménez; Roberto Alcover-Sánchez; Emiliano Pereira; María Jesús Gómez García; Patricia Martínez Vián; Díez- Jiménez; Alcover- Sánchez; Vián. Design and Test of Cryogenic Cold Plate for Thermal-Vacuum Testing of Space Components. Energies 2019, 12, 2991 .

AMA Style

Efrén Díez-Jiménez, Roberto Alcover-Sánchez, Emiliano Pereira, María Jesús Gómez García, Patricia Martínez Vián, Díez- Jiménez, Alcover- Sánchez, Vián. Design and Test of Cryogenic Cold Plate for Thermal-Vacuum Testing of Space Components. Energies. 2019; 12 (15):2991.

Chicago/Turabian Style

Efrén Díez-Jiménez; Roberto Alcover-Sánchez; Emiliano Pereira; María Jesús Gómez García; Patricia Martínez Vián; Díez- Jiménez; Alcover- Sánchez; Vián. 2019. "Design and Test of Cryogenic Cold Plate for Thermal-Vacuum Testing of Space Components." Energies 12, no. 15: 2991.

Journal article
Published: 21 March 2019 in Applied Sciences
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The image processing of mammograms is very important for the early detection of breast pathologies, including cancer. This paper proposes a new technique based on directional fractal filtering for detecting microcalcification clusters or irregularly shaped microcalcifications. The proposed algorithm has two parts: a preprocessing step for detecting and locating microcalcification; and a second zooming, enhancement, and segmentation step. Detection is performed by image convolution using a set of masks with interesting fractal properties. Combined with other simple mathematical operations, remarkable contrast enhancement and segmentation are produced. The final result permits the clear delineation of the shape of individual microcalcifications. A comparison is made with other microcalcification enhancement techniques described in the literature.

ACS Style

Rocio Sanchez-Montero; Juan-Antonio Martinez-Rojas; Pablo-Luis Lopez-Espi; Luis Nuñez-Martin; Efren Diez-Jimenez. Filtering of Mammograms Based on Convolution with Directional Fractal Masks to Enhance Microcalcifications. Applied Sciences 2019, 9, 1194 .

AMA Style

Rocio Sanchez-Montero, Juan-Antonio Martinez-Rojas, Pablo-Luis Lopez-Espi, Luis Nuñez-Martin, Efren Diez-Jimenez. Filtering of Mammograms Based on Convolution with Directional Fractal Masks to Enhance Microcalcifications. Applied Sciences. 2019; 9 (6):1194.

Chicago/Turabian Style

Rocio Sanchez-Montero; Juan-Antonio Martinez-Rojas; Pablo-Luis Lopez-Espi; Luis Nuñez-Martin; Efren Diez-Jimenez. 2019. "Filtering of Mammograms Based on Convolution with Directional Fractal Masks to Enhance Microcalcifications." Applied Sciences 9, no. 6: 1194.

Accepted manuscript
Published: 04 January 2019 in Smart Materials and Structures
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When an electrically conductive material is exposed to time-varying magnetic fields, eddy currents are generated inside the conductor which oppose the change in the magnetic field. When eddy currents circulate through the conductor they are dissipated in form of heat due to the resistivity of the material. For low frequency vibrations, eddy current damping force is proportional to the vibration speed. Therefore, damping of vibrations at low frequencies or displacement amplitudes becomes increasingly difficult using this technology. Typical damping densities of eddy current dampers range between 0.1 for most devices and 2 MNsm-4 for best-in-class prototypes. Those values are relatively low compared with, for examples, hydraulic dampers that can reach up to 4 MNsm-4. This low density limits potential applications of the technology. In addition, certain applications like vibration isolation of aircraft engines may require the damper to operate at high temperatures. However, most of current damping solutions are rarely effective at temperature higher than 100ºC because they frequently use NdFe magnets. In this paper, a passive eddy current damper with enhanced performance for use in high temperatures is presented. The Z-Damper takes advantage from impedance matching inside a magnetic linear gear to amplify the input vibration motion, maximizing the effectiveness of an integrated eddy current damper. SmCo magnets and high-temperature components are used in the Z-Damper, potentially enabling operation in a wide temperature range. A theoretical model describing the dynamic behavior of the Z-Damper is presented and a set of experiments were conducted to evaluate its performance. A prototype of the Z-Damper has been designed, manufactured and experimentally demonstrated in a temperature range from 25ºC to 200ºC under low frequency (up to 60 Hz) harmonic excitations. A maximum equivalent viscous damping coefficient of 35 Ns/mm, measured at 200ºC, has been achieved. A damping density of 8.4 MNsm-4 is calculated.

ACS Style

Jose Luis Perez-Diaz; Ignacio Valiente-Blanco; Cristian Cristache; J Sanchez-García-Casarubios; Fernando Rodriguez; J Esnoz; Efrén Diez-Jimenez; Juan Sanchez-García-Casarrubios; Judit Esnoz Larraya. A novel high temperature eddy current damper with enhanced performance by means of impedance matching. Smart Materials and Structures 2019, 28, 025034 .

AMA Style

Jose Luis Perez-Diaz, Ignacio Valiente-Blanco, Cristian Cristache, J Sanchez-García-Casarubios, Fernando Rodriguez, J Esnoz, Efrén Diez-Jimenez, Juan Sanchez-García-Casarrubios, Judit Esnoz Larraya. A novel high temperature eddy current damper with enhanced performance by means of impedance matching. Smart Materials and Structures. 2019; 28 (2):025034.

Chicago/Turabian Style

Jose Luis Perez-Diaz; Ignacio Valiente-Blanco; Cristian Cristache; J Sanchez-García-Casarubios; Fernando Rodriguez; J Esnoz; Efrén Diez-Jimenez; Juan Sanchez-García-Casarrubios; Judit Esnoz Larraya. 2019. "A novel high temperature eddy current damper with enhanced performance by means of impedance matching." Smart Materials and Structures 28, no. 2: 025034.

Conference paper
Published: 01 November 2018 in ICERI2018 Proceedings
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ACS Style

Efren Diez Jimenez; Miriam Martínez-Muñoz. MATH LEARNING THROUGH CLASSIC CRYPTOGRAPHY. ICERI2018 Proceedings 2018, 5775 -5780.

AMA Style

Efren Diez Jimenez, Miriam Martínez-Muñoz. MATH LEARNING THROUGH CLASSIC CRYPTOGRAPHY. ICERI2018 Proceedings. 2018; ():5775-5780.

Chicago/Turabian Style

Efren Diez Jimenez; Miriam Martínez-Muñoz. 2018. "MATH LEARNING THROUGH CLASSIC CRYPTOGRAPHY." ICERI2018 Proceedings , no. : 5775-5780.

Conference paper
Published: 01 November 2018 in ICERI2018 Proceedings
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ACS Style

Efren Diez Jimenez; Miriam Martínez-Muñoz; Jesús Muñoz-Jiménez; Ignacio Valiente-Blanco; María Jesús Gómez-García. PHYSICAL EDUCATION AS A VECTOR FOR ENHANCING THE INTEREST ON SCIENCE STUDIES. ICERI2018 Proceedings 2018, 4966 -4975.

AMA Style

Efren Diez Jimenez, Miriam Martínez-Muñoz, Jesús Muñoz-Jiménez, Ignacio Valiente-Blanco, María Jesús Gómez-García. PHYSICAL EDUCATION AS A VECTOR FOR ENHANCING THE INTEREST ON SCIENCE STUDIES. ICERI2018 Proceedings. 2018; ():4966-4975.

Chicago/Turabian Style

Efren Diez Jimenez; Miriam Martínez-Muñoz; Jesús Muñoz-Jiménez; Ignacio Valiente-Blanco; María Jesús Gómez-García. 2018. "PHYSICAL EDUCATION AS A VECTOR FOR ENHANCING THE INTEREST ON SCIENCE STUDIES." ICERI2018 Proceedings , no. : 4966-4975.

Journal article
Published: 01 April 2018 in Journal of Magnetism and Magnetic Materials
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ACS Style

Efren Diez-Jimenez; José Luis Pérez-Díaz; C. Ferdeghini; Fabio Canepa; C. Bernini; C. Cristache; J. Sanchez-Garcia-Casarrubios; I. Valiente-Blanco; E.M. Ruiz-Navas; J.A. Martínez-Rojas. Magnetic and morphological characterization of Nd2Fe14B magnets with different quality grades at low temperature 5–300 K. Journal of Magnetism and Magnetic Materials 2018, 451, 549 -553.

AMA Style

Efren Diez-Jimenez, José Luis Pérez-Díaz, C. Ferdeghini, Fabio Canepa, C. Bernini, C. Cristache, J. Sanchez-Garcia-Casarrubios, I. Valiente-Blanco, E.M. Ruiz-Navas, J.A. Martínez-Rojas. Magnetic and morphological characterization of Nd2Fe14B magnets with different quality grades at low temperature 5–300 K. Journal of Magnetism and Magnetic Materials. 2018; 451 ():549-553.

Chicago/Turabian Style

Efren Diez-Jimenez; José Luis Pérez-Díaz; C. Ferdeghini; Fabio Canepa; C. Bernini; C. Cristache; J. Sanchez-Garcia-Casarrubios; I. Valiente-Blanco; E.M. Ruiz-Navas; J.A. Martínez-Rojas. 2018. "Magnetic and morphological characterization of Nd2Fe14B magnets with different quality grades at low temperature 5–300 K." Journal of Magnetism and Magnetic Materials 451, no. : 549-553.

Communication
Published: 31 December 2017 in Micromachines
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Magnetomechanical components can be a good solution in order to reduce, or even completely avoid, friction phenomena in micro-electro-mechanical systems (MEMS) since they can transmit forces through magnetic fields without contacts. In this communication, electromagnetic simulations of the expected specific torque of a coaxial magnetic gear are given. The results show that micromagnetic gears (3 mm of diameter) could provide a specific torque up to 8.98 Nm/kg, several times larger than the specific torque that microgears (<9 mm of diameter) can provide. This implies that micromagnetic gears could provide speed conversion without contact in the teeth, avoiding corresponding friction, but also that it would even improve the specific torque transmission with respect to contact microgears.

ACS Style

Efren Diez-Jimenez; Rocio Sanchez-Montero; Miriam Martinez-Muñoz. Towards Miniaturization of Magnetic Gears: Torque Performance Assessment. Micromachines 2017, 9, 16 .

AMA Style

Efren Diez-Jimenez, Rocio Sanchez-Montero, Miriam Martinez-Muñoz. Towards Miniaturization of Magnetic Gears: Torque Performance Assessment. Micromachines. 2017; 9 (1):16.

Chicago/Turabian Style

Efren Diez-Jimenez; Rocio Sanchez-Montero; Miriam Martinez-Muñoz. 2017. "Towards Miniaturization of Magnetic Gears: Torque Performance Assessment." Micromachines 9, no. 1: 16.

Conference paper
Published: 01 September 2017 in 2017 AEIT International Annual Conference
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ACS Style

A. Musolino; M. Raugi; R. Rizzo; M. Tucci; E. Diez Jimenez. Optimal design of a permanent magnet spring. 2017 AEIT International Annual Conference 2017, 1 .

AMA Style

A. Musolino, M. Raugi, R. Rizzo, M. Tucci, E. Diez Jimenez. Optimal design of a permanent magnet spring. 2017 AEIT International Annual Conference. 2017; ():1.

Chicago/Turabian Style

A. Musolino; M. Raugi; R. Rizzo; M. Tucci; E. Diez Jimenez. 2017. "Optimal design of a permanent magnet spring." 2017 AEIT International Annual Conference , no. : 1.

Journal article
Published: 07 September 2016 in Machines
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Actual aerospace and defense technologies present multiple limitations that need to be overcome in order to evolve to less contaminating and more efficient aircraft solutions. Contactless technologies come with essential advantages such as the absence of wear and friction. This work describes the design, prototype, and performance test according to RTCA-DO-160 of an aeronautical magnetic torque limiter. The results show correct continuous transmission operation (2250 rpm and 24 Nm) from −50 °C to +90 °C. Moreover, overload protection has been demonstrated for more than 200 jamming events without damage or required maintenance to the device.

ACS Style

Cristian Cristache; Efren Diez-Jimenez; Ignacio Valiente-Blanco; Juan Sanchez-Garcia-Casarrubios; Jose-Luis Perez-Diaz. Aeronautical Magnetic Torque Limiter for Passive Protection against Overloads. Machines 2016, 4, 17 .

AMA Style

Cristian Cristache, Efren Diez-Jimenez, Ignacio Valiente-Blanco, Juan Sanchez-Garcia-Casarrubios, Jose-Luis Perez-Diaz. Aeronautical Magnetic Torque Limiter for Passive Protection against Overloads. Machines. 2016; 4 (3):17.

Chicago/Turabian Style

Cristian Cristache; Efren Diez-Jimenez; Ignacio Valiente-Blanco; Juan Sanchez-Garcia-Casarrubios; Jose-Luis Perez-Diaz. 2016. "Aeronautical Magnetic Torque Limiter for Passive Protection against Overloads." Machines 4, no. 3: 17.

Journal article
Published: 01 January 2016 in Progress In Electromagnetics Research M
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ACS Style

Efren Diez-Jimenez; Antonino Musolino; Rocco Rizzo; Ernesto Tripodi. ANALYSIS OF THE STATIC AND DYNAMIC BEHAVIOR OF A NON HYSTERETIC SUPERCONDUCTIVE PASSIVE MAGNETIC LINEAR BEARING BY USING AN ELECTROMAGNETIC INTEGRAL FORMULATION. Progress In Electromagnetics Research M 2016, 50, 183 -193.

AMA Style

Efren Diez-Jimenez, Antonino Musolino, Rocco Rizzo, Ernesto Tripodi. ANALYSIS OF THE STATIC AND DYNAMIC BEHAVIOR OF A NON HYSTERETIC SUPERCONDUCTIVE PASSIVE MAGNETIC LINEAR BEARING BY USING AN ELECTROMAGNETIC INTEGRAL FORMULATION. Progress In Electromagnetics Research M. 2016; 50 ():183-193.

Chicago/Turabian Style

Efren Diez-Jimenez; Antonino Musolino; Rocco Rizzo; Ernesto Tripodi. 2016. "ANALYSIS OF THE STATIC AND DYNAMIC BEHAVIOR OF A NON HYSTERETIC SUPERCONDUCTIVE PASSIVE MAGNETIC LINEAR BEARING BY USING AN ELECTROMAGNETIC INTEGRAL FORMULATION." Progress In Electromagnetics Research M 50, no. : 183-193.