Article
Physics, Condensed Matter
Teik-Cheng Lim
Summary: A mechanical metamaterial has been proposed that can tune the coefficients of thermal and moisture expansions, while maintaining a consistently auxetic behavior. By adjusting the inclination angle of the equal-armed crosses within the structure, it is possible to change the material's thermal and moisture expansion properties.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2021)
Article
Physics, Multidisciplinary
Leiyu Yang, Lifeng Wang
Summary: Metamaterials with negative effective moment of inertia and negative effective stiffness can generate bandgaps in certain frequency ranges, leading to quick wave attenuation. They can achieve wide bandgaps and zero-frequency bandgaps in the low-frequency range, suitable for ultralow-frequency-vibration isolation.
NEW JOURNAL OF PHYSICS
(2021)
Article
Engineering, Multidisciplinary
Renzhen Chen, Xiaopeng Li, Zemin Yang, Jinchi Xu, Hexu Yang
Summary: The newly proposed vibration isolation joint combines positive and negative stiffness, supports multi-directional stiffness adjustment, and changes structural stiffness by altering the effective length of the beam. It provides good passive low-frequency vibration isolation performance and enables active control of ultra-low frequency vibration isolation by actively changing the structural stiffness.
Article
Mechanics
Shaowei Zhu, Bing Wang, Xiaojun Tan, Jiqiang Hu, Lianchao Wang, Zhengong Zhou, Shuai Chen
Summary: Negative stiffness metamaterials (NSM) have the capability to repeatedly dissipate mechanical energy, but typically require multiple cells arranged in series or assembled with a spring. A novel bi-material NSM in sleeve-type (BMST-NSM) is introduced, which can dissipate energy even with just one negative stiffness cell, and can be tailored to exhibit recoverable or multi-stable behavior through parameter design. Through testing, it has been demonstrated that BMST-NSM shows good reusability, energy dissipation ability, and high energy absorption capability within a limited displacement range, making it promising for low ultra-low frequency vibration isolation and impacting protection applications.
COMPOSITE STRUCTURES
(2021)
Article
Computer Science, Information Systems
Md Mhedi Hasan, Mohammad Tariqul Islam, Md Moniruzzaman, Mohd Hafiz Uddin, Norsuzlin Binti Mohd Sahar, Md Samsuzzaman
Summary: This study proposes a dual band epsilon negative (ENG) metamaterial for C and X band wireless communication systems. The traditional split-ring resonator (SRR) is improved with a new engineered structure. The proposed unit cell extends its electrical length and tunes the resonance frequency by coupling two inner rings vertically to the outer ring. Numerical simulation and performance analysis show that the proposed unit cell and array configuration exhibit two resonances at 6.7 and 10.5 GHz, with wide bandwidth, negative permittivity, and near-zero refractive index and permeability. The observed properties of the proposed unit cell enhance the gain and directivity of the antenna system for wireless communications.
CMC-COMPUTERS MATERIALS & CONTINUA
(2022)
Article
Multidisciplinary Sciences
Teik-Cheng Lim
Summary: Inspired by the Maltese cross, a metamaterial capable of exhibiting both positive and negative coefficients of moisture and thermal expansion is presented, while also demonstrating auxetic properties. Effective models for moisture and thermal expansion coefficients were developed through a combination of rotational and translational motions.
ROYAL SOCIETY OPEN SCIENCE
(2021)
Article
Chemistry, Inorganic & Nuclear
Zi-Ming Ye, Kai-Ping Xie, Chao Wang, Xue-Wen Zhang, Hao-Long Zhou, Jie-Peng Zhang
Summary: The solvothermal reaction yielded a porous coordination polymer with a fence-like coordination framework and remarkable thermal expansion properties, which were significantly enhanced by inclusion of toluene.
INORGANIC CHEMISTRY
(2021)
Article
Multidisciplinary Sciences
Teik-Cheng Lim
Summary: In this study, a controllable metamaterial with positive and negative thermal and hygroscopic expansions is investigated, inspired by Islamic geometric patterns. By constructing from eight pairs of pin-jointed Y-elements, the unit cell of the metamaterial ranges from an eight-pointed star to a regular octagon. The effective coefficients of thermal expansion and moisture expansion are found to be controllable by adjusting the geometrical descriptors of the bimaterial spiral spring and the properties of the bimaterial's layers.
Article
Mathematics, Applied
Romulo D. D. Carlos, Giovany M. M. Figueiredo, Ricardo Ruviaro
Summary: Using variational methods, this study proves the existence of solutions for two classes of elliptic Kirchhoff-Boussinesq-type problems in R(N) and R-N, given by delta(2)u - delta pu + u = h(u) and delta(2)u - delta(p)u = f(u), respectively.
APPLICABLE ANALYSIS
(2023)
Article
Chemistry, Multidisciplinary
Eti Barazani, Dip Das, Chubin Huang, Abhishek Rakshit, Cecile Saguy, Pavel Salev, Javier del Valle, Maytal Caspary Toroker, Ivan K. K. Schuller, Yoav Kalcheim
Summary: The effects of strain on the metal-insulator phase transitions in V2O3 are explored. It is found that the expansion of the ab-plane is crucial for inducing negative pressure effects in the films. The findings provide insights into manipulating a Mott transition in V2O3 and expanding its potential applications in electronics.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Physics, Multidisciplinary
Peng Suo, Huiyun Zhang, Shengnan Yan, Wenjie Zhang, Jibo Fu, Xian Lin, Song Hao, Zuanming Jin, Yuping Zhang, Chao Zhang, Feng Miao, Shi-Jun Liang, Guohong Ma
Summary: In this study, the photocarrier dynamics of PtTe2 thin films were systematically studied using optical pump-terahertz probe spectroscopy. The research revealed unusual behaviors of terahertz photoconductivity and provided insights into simultaneous carrier cooling and polaron formation on a subpicosecond timescale. These findings are crucial for the design of optoelectronic devices based on PtTe2.
PHYSICAL REVIEW LETTERS
(2021)
Article
Electrochemistry
Yulong Liu, Lin Ma, J. R. Dahn
Summary: This study demonstrates the design and construction of symmetric cells to gain insights into full Li-ion cell degradation. Results show that using coin cells, the capacity retention and impedance growth of electrodes lie between +/+ and -/- configurations.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Jean-Jacques Marigo, Agnes Maurel, Kim Pham
Summary: In this study, we analyze the band structure of a single-phase metamaterial involving low-frequency flexural resonances by combining asymptotic homogenization and Bloch-Floquet analysis. We provide a closed-form expression of the dispersion relation in the whole Brillouin zone and demonstrate the existence of band-gaps and negative refraction in the hyperbolic regions of the dispersion diagram at low frequencies. Our findings are validated through direct numerical calculations.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Engineering, Mechanical
Changqi Cai, Jiaxi Zhou, Kai Wang, Hongbin Pan, Dongguo Tan, Daolin Xu, Guilin Wen, John E. Mottershead
Summary: This paper proposes a novel metamaterial beam with an embedded quasi-zero-stiffness resonator to achieve wave attenuation in very low-frequency band gaps. The configuration of the quasi-zero-stiffness resonator is developed using compliant mechanism with design optimization, and the characteristic of quasi zero stiffness is achieved by proper pre-compression. The dispersion relations of the metamaterial beam are derived using the transfer matrix method, and the dynamic responses of the beam are obtained using the spectral element method to evaluate the transmittance of the flexural wave. Experimental investigation verifies the formation mechanism of the band gaps, demonstrating very low-frequency band gaps. Therefore, the QZS metamaterial beam holds promise for low wave attenuation.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Civil
Yuhao Liu, Jian Yang, Xiaosu Yi, Wenjie Guo, Qingsong Feng, Dimitrios Chronopoulos
Summary: This paper presents a diatomic-chain locally resonant acoustic metamaterial (LRAM) structure with a negative stiffness mechanism for enhanced vibration suppression. By studying the bandgap properties of the diatomic configuration, it is shown that introducing two extra bandgaps can enhance performance benefits. Converting a monoatomic configuration into a diatomic configuration is beneficial. A dispersion relation analysis reveals new phenomena in vibration power flow and wave transmittance, demonstrating the potential application of negative stiffness for performance improvement.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Manufacturing
Khadim Dieng, Philippe Artillan, Cedric Bermond, Olivier Guiller, Thierry Lacrevaz, Sylvain Joblot, Gregory Houzet, Alexis Farcy, Anne-Laure Perrier, Yann Lamy, Bernard Flechet
IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
(2017)
Article
Physics, Applied
Aurelien Marteau, Gabriel Velu, Gregory Houzet, Ludovic Burgnies, Eric Lheurette, Jean Claude Carru, Didier Lippens
APPLIED PHYSICS LETTERS
(2009)
Article
Materials Science, Multidisciplinary
G. Houzet, K. Blary, S. Lepilliet, D. Lippens, L. Burgnies, G. Velu, J. C. Carru, E. Nguema, P. Mounaix
Article
Engineering, Electrical & Electronic
Gregory Houzet, Thierry Lacrevaz, Cedric Bermond, Bernard Flechet, Arnaud Le Febvrier, Stephanie Deputier, Maryline Guilloux-Viry, Patrick Queffelec
INTEGRATED FERROELECTRICS
(2014)
Article
Physics, Applied
Gregory Houzet, Karine Blary, Sylvie Lepilliet, Didier Lippens, Ludovic Burgnies, Gabriel Velu, Jean-Claude Carru, Edwin Nguema, Patrick Mounaix
JOURNAL OF APPLIED PHYSICS
(2011)
Article
Physics, Applied
P. Queffelec, V. Laur, A. Chevalier, J. -M. Le Floch, D. Passerieux, D. Cros, V. Madrangeas, A. Le Febvrier, S. Deputier, M. Guilloux-Viry, G. Houzet, T. Lacrevaz, C. Bermond, B. Flechet
JOURNAL OF APPLIED PHYSICS
(2014)
Article
Engineering, Manufacturing
Thierry Lacrevaz, Cedric Bermond, Ossama El Bouayadi, Gregory Houzet, Philippe Artillan, Yann Lamy, Khadim Dieng, Bernard Flechet
IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
(2014)
Article
Engineering, Electrical & Electronic
Gregory Houzet, Thierry Lacrevaz, Cedric Bermond, Philippe Artillan, David Auchere, Laurent Schwarz, Bernard Flechet
Summary: This paper presents in-situ characterization of insulating materials used in packaging and substrate of chips, highlighting their importance in maintaining signal integrity at high frequencies. Novel analysis techniques are employed to avoid metallization steps and allow for 2D scanning of complex permittivity across the sample surface.
MICROELECTRONICS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Thi-Hong-Le Dam, Gregory Houzet, Thierry Lacrevaz, Tan-Phu Vuong
Summary: We propose a directive broadband and high gain Vivaldi antenna for 5G applications in theKa-band. By utilizing a substrate lens and quasi-substrate integrated waveguide structure, the gain of the antenna is increased and impedance matching is improved.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2022)
Article
Computer Science, Information Systems
Majdi Bahrouni, Gregory Houzet, Tan Phu Vuong, Paulo M. Mendes, Hugo Dinis, Rui Silva, Hichem Trabelsi
Summary: Different implantable antenna designs exist to establish communication with implantable devices based on domain of use and implantation space. These antennas have various imposed criteria on characteristics such as bandwidth, multiband behavior, radiation pattern, gain, and specific absorption rate. Many of the existing designs do not follow a specific approach and the use of biological or synthetic phantoms is widely employed to validate simulation results. This paper presents a miniature dual-band structure derived from the Koch fractal structure, designed to operate 2 mm below the skin in the arm, with the MICS and ISM 2.4 GHz bands.
Proceedings Paper
Engineering, Electrical & Electronic
T. H. Le Dam, Alejandro Niembro-Martin, Thierry Lacrevaz, Gregory Houzet, Camille Delfaut, Damien Paulet, Nadege Reverdy-Bruas, Q. Bao Duong, T. Phu Vuong
Summary: This paper presents an FSS-based printed radome demonstrator for orientating a patch antenna radiation pattern in 5G applications. The FSS-based pattern is printed onto a plastic hemisphere dome surface using jetting piezoelectric technology, and it is composed of two different unit cells that reflect or allow radiation waves of the antenna to pass through. The measurement shows a 30-degree adjustment of the main radiation direction of the antenna.
2022 52ND EUROPEAN MICROWAVE CONFERENCE (EUMC)
(2022)
Proceedings Paper
Energy & Fuels
Gregory Houzet, Philippe Artillan, Cedric Bermond, Thierry Lacrevaz, Bernard Flechet
2019 23RD IEEE WORKSHOP ON SIGNAL AND POWER INTEGRITY (SPI 2019)
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
Khadim Diene, Cedric Bermond, Philippe Artillan, Thierry Lacrevaz, Gregory Houzet, Bernard Flechet, Olivier Guiller, Sylvain Joblot, Alexis Farcy, Yann Lamy
2016 IEEE 66TH ELECTRONIC COMPONENTS AND TECHNOLOGY CONFERENCE (ECTC)
(2016)
Proceedings Paper
Electrochemistry
G. Houzet, T. Lacrevaz, C. Bermond, A. Le Febvrier, S. Deputier, M. Guilloux-Viry, P. Queffelec, B. Flechet
SEMICONDUCTORS, DIELECTRICS, AND METALS FOR NANOELECTRONICS 11
(2013)
Article
Education & Educational Research
Jean-Charles Marty, Thibault Carron, Philippe Pernelle, Stephane Talbot, Gregory Houzet
INTERNATIONAL JOURNAL OF GAME-BASED LEARNING
(2015)
