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Ferri, Matteo,Mancarella, Fulvio,Seshia, Ashwin,Ransley, James,Soga, Kenichi,Zalesky, Jan,Roncaglia, Alberto Techno-Press 2010 Smart Structures and Systems, An International Jou Vol.6 No.3
We report on the development of a new technology for the fabrication of Micro-Electro-Mechanical-System (MEMS) strain sensors to realize a novel type of crackmeter for health monitoring of ageing civil infrastructures. The fabrication of micromachined silicon MEMS sensors based on a Silicon On Insulator (SOI) technology, designed according to a Double Ended Tuning Fork (DETF) geometry is presented, using a novel process which includes a gap narrowing procedure suitable to fabricate sensors with low motional resistance. In order to employ these sensors for crack monitoring, techniques suited for bonding the MEMS sensors on a steel surface ensuring good strain transfer from steel to silicon and a packaging technique for the bonded sensors are proposed, conceived for realizing a low-power crackmeter for ageing infrastructure monitoring. Moreover, the design of a possible crackmeter geometry suited for detection of crack contraction and expansion with a resolution of $10{\mu}m$ and very low power consumption requirements (potentially suitable for wireless operation) is presented. In these sensors, the small crackmeter range for the first field use is related to long-term observation on existing cracks in underground tunnel test sections.
Mentorship program to elevate journal quality and rankings in Indonesia: a case study
Ferry Efendi,Hery Purnobasuki,Dessy Harisanty,Diyah Alinia Oktariningtias,Sarah Khairunnisa 한국과학학술지편집인협의회 2024 Science Editing Vol.11 No.2
This article explores the best practices of mentorship programs in all journals at Universitas Airlangga. The university has established a journal mentoring team, as mandated by the rector’s regulation, which is responsible for guiding journals through preparation, submission, management, policy, and overall quality improvement. A case study was conducted to explore the mentoring mechanisms at Universitas Airlangga. Mentors were selected from among experienced editors at the university, each with a distinguished background in managing their own journals. The mentorship program successfully led to the indexing of 14 journals in Scopus, one in Web of Science (WoS), 85 in the Science and Technology Index (SINTA), and 60 in Directory of Open Access Journals (DOAJ). The strategies used can be shared with other universities to assist their journal editors. The mentorship program at Universitas Airlangga has significantly improved the quality and international visibility of its academic journals. This is evidenced by the successful indexing of numerous journals in prestigious databases including Scopus, WoS, SINTA, and DOAJ. The structured mentoring, clear targets, and comprehensive institutional support were instrumental in achieving these results. This model serves as a scalable best practice for other universities seeking to improve their journal quality and global standing.
Nonlinear programming approach for a class of inverse problems in elastoplasticity
Ferris, M.C.,Tin-Loi, F. Techno-Press 1998 Structural Engineering and Mechanics, An Int'l Jou Vol.6 No.8
This paper deals with a special class of inverse problems in discrete structural plasticity involving the identification of elastic limits and hardening moduli on the basis of information on displacements. The governing equations lead naturally to a special and challenging optimization problem known as a Mathematical Program with Equilibrium Constraints (MPEC), a key feature of which is the orthogonality of two sign-constrained vectors or so-called "complementarity" condition. We investigate numerically the application of two simple algorithms, both based on the use of the general purpose nonlinear programming code CONOPT accessed via the GAMS modeling language, for solving the suitably reformulated problem. Application is illustrated by means of two numerical examples.
Local Electrical Characterization of PVDF Textile Filament
Anthony Ferri,François Rault,Antonio Da Costa,Cédric Cochrane,Matthieu Boudriaux,Guillaume Lemort,Christine Campagne,Eric Devaux,Christian Courtois,Rachel Desfeux 한국섬유공학회 2019 Fibers and polymers Vol.20 No.7
The piezoelectric behavior of poly(vinylidene fluoride), PVDF, has been known for several decades and is clearlyrelated to its crystalline phases. Many works made on films or fibers have focused on the characterization of the phasetransitions during various PVDF processing and on its electromechanical activity by combining several techniques. Piezoforcemicroscopy (PFM) is an interesting tool to underline the crystalline forms and piezoelectricity efficiency of PVDF atthe local scale. However, this technique is little used on samples in the form of fibers and in this case, it is most oftennanofibers. In this work, two conventional PVDF textile filaments, with different weak draw ratio, are produced and analyzedby FTIR, XRD, and PFM. We demonstrate that the PFM analysis can be relevant for specimens presenting low signals duringother characterizations. Therefore, the local piezo-/ferroelectricity into the fiber is highlighted underlining the existence of thepolar phases of PVDF. Then, the effective piezoelectric coefficient d33 of PVDF fiber drawn with a ratio of 1.5 is estimated at12 pm/V.
Matteo Ferri,Fulvio Mancarella,Ashwin Seshia,James Ransley,Kenichi Soga,Jan Zalesky,Alberto Roncaglia 국제구조공학회 2010 Smart Structures and Systems, An International Jou Vol.6 No.3
We report on the development of a new technology for the fabrication of Micro-Electro-Mechanical-System (MEMS) strain sensors to realize a novel type of crackmeter for health monitoring of ageing civil infrastructures. The fabrication of micromachined silicon MEMS sensors based on a Silicon On Insulator (SOI) technology, designed according to a Double Ended Tuning Fork (DETF) geometry is presented, using a novel process which includes a gap narrowing procedure suitable to fabricate sensors with low motional resistance. In order to employ these sensors for crack monitoring, techniques suited for bonding the MEMS sensors on a steel surface ensuring good strain transfer from steel to silicon and a packaging technique for the bonded sensors are proposed, conceived for realizing a low-power crackmeter for ageing infrastructure monitoring. Moreover, the design of a possible crackmeter geometry suited for detection of crack contraction and expansion with a resolution of 10 and very low power consumption requirements (potentially suitable for wireless operation) is presented. In these sensors, the small crackmeter range for the first field use is related to long-term observation on existing cracks in underground tunnel test sections.
On Not Being a Sign: Gold’s Semiotic Claims
Elizabeth Ferry 한국외국어대학교 HK 세미오시스 연구센터 2016 Signs and Society Vol.4 No.1
In this essay I examine gold’s semiotic claims in the context of perceptions of gold in global financial markets, beginning with an intriguing parallel drawn by my informants between gold and Bitcoin. I make several interrelated arguments: (1) that in a variety of cultural contexts, gold has become a site for a very particular semiotic claim—that of not signifying at all; (2) that in the contemporary instance of physical gold in relation to other assets based on gold, this is expressed in an attention to gold’s material, tactile qualities (represented both iconically and indexically), and its extrasocial character; (3) that similar claims are made for Bitcoin, often drawing on a “digital metallism,” and idiom of gold; and (4) that the self-reflexive semiotic properties of gold have a long and diverse cultural history. In concluding, I speculate on how gold’s particular semiotic stance reflects one possible articulation of nature and convention as sources of meaning.