| 1. |
- Campoleoni, A., et al.
(author)
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Unconstrained higher spins of mixed symmetry I. Bose fields
- 2009
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In: Nuclear Physics B. - : Elsevier BV. - 0550-3213. ; 815:3, s. 289-367
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Journal article (peer-reviewed)abstract
- This is the first of two papers devoted to the local "metric-like" unconstrained Lagrangians and field equations for higher-spin gauge fields of mixed symmetry in flat space. Here we complete the previous constrained formulation of Labastida for Bose fields. We thus recover his Lagrangians via the Bianchi identities. before extending them to their "minimal" unconstrained form with higher derivatives of the compensator fields and to yet another, non-minimal, form with only two-derivative terms. We also identify classes of these systems that are invariant under Weyl-like symmetries. (C) 2008 Elsevier B.V. All rights reserved.
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| 2. |
- Coe, Anna-Britt, 1967-
(author)
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Social Processes Underlying Movement Influence : Young Adult Feminist Activists’ Interactions with Professionalized Feminist Organizations in Ecuador and Peru
- 2021
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In: The Sociological Quarterly. - : Routledge. - 0038-0253 .- 1533-8525. ; 62:1, s. 15-35
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Journal article (peer-reviewed)abstract
- Despite extensive research on the influence between social movements, knowledge remains limited to the basic social processes by which this occurs. This article locates these social processes in the accounts among young adult feminist activists in Ecuador and Peru. Qualitative interviews were conducted and analyzed among 21 young adult feminist activists from eight groups. The findings show how their feminist mobilizing was influenced by interactions with professionalized feminist organizations that were simultaneously inclusive and exclusionary. Three in/exclusionary interactions captured basic social processes whereby young adult feminist activists struggled to define modes of participation, organizational practices, and targets of engagement.
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| 3. |
- Coe, Anna-Britt, 1967-
(author)
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Youth activism (Latin America)
- 2022
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In: The Wiley-Blackwell encyclopedia of social & political movements. - : John Wiley & Sons. - 9780470674871
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Book chapter (peer-reviewed)abstract
- Youth activism in Latin America refers to young adults' political practices and meanings situated within the particular historical and social conditions of this region. Even though examples of youth activism date back to the 1600s, young adults' political practices and meanings have only recently begun to be seen in their own right. This is because youth political subjectivities have long been constrained by long-standing social hierarchies, including those based on age, as well as by the tentative relationship between state and society.
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| 4. |
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| 5. |
- Cotrim, Joao Miguel, et al.
(author)
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Making Sense of the Sharing Economy : A Category Formation Approach
- 2020
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In: Sustainability. - : MDPI AG. - 2071-1050. ; 12:24
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Journal article (peer-reviewed)abstract
- The sharing economy (SE) has drawn significant attention from several society stakeholders in the last five years. While business actors are interested in financial opportunities to meet consumer needs, new business models, academia and governmental organisations are concerned with potential unintended effects on society and the environment. Despite its notable global growth, there is still a lack of more solid ground in understanding its origins and respective mechanisms through which it has been evolving as a category. This research addresses the problematics of the origins and ascendency of the SE by examining the process by which it is arising as a new category, searching for conceptual clarification, and pinpointing the legitimacy granted by stakeholders. Our guiding research questions are: how the SE was formed and evolved as a category, and as a category, is the SE legitimate? Additionally, we attempt to identify the nature of the SE as a category. Making a historical analysis of the expression SE and its equivalents, this paper deepens the discussion about the SE's nature by providing evidence that it has predominantly been formed by emergence processes, comprising social movement, similarity clustering, and truce components, which render the SE a particular case of category formation and allow communication, entrepreneurship, regulation, and research about what it is. Moreover, the findings reveal a generalised legitimacy granted to the SE by a vast number of stakeholders, although still lacking the consolidation of socio-political legitimation. The SE's nature seems to fall into a metaphorical approach, notably, the notion of radial categories.
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| 6. |
- Gil Berrocal, Carlos, 1986, et al.
(author)
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Strain and Temperature Monitoring in Early-Age Concrete by Distributed Optical Fiber Sensing
- 2023
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In: Proceedings SynerCrete 2023 International RILEM Conference on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures. - : Springer Nature. ; , s. 913-924, s. 913-924
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Conference paper (other academic/artistic)abstract
- In the way towards a carbon neutral construction industry, the partial substitution of cement clinker by alternative binders is becoming increasingly popular in the design of low-carbon concrete mixes. However, as new concrete mixes are developed, the parameters governing the risk of early-age cracking arising from restraint forces due to thermal and shrinkage deformations need to be investigated for each mix. This paper reports the results of a field test in which distributed optical fiber sensors (DOFS) were used to monitor strain and temperature in two large-scale prisms cast against the ground. One of the specimens was cast with a reference concrete mix with CEM I whereas in the other mix cement was partly replaced by fly ash. After casting, mineral wool was used to insulate the specimens in order to reproduce realistic conditions in large mass concrete elements. Temperature measurements enabled a direct comparison of the heat generated by each mix as well as the estimation of the strength development. Strain measurements, on the other hand, gave an indication of the variation of the degree of restraint along the height of the specimens. Using available models for concrete creep, the tensile stresses along the specimens were calculated at different heights and compared to the expected tensile strength in order to assess the crack risk. After removing the insulation, measured strains exhibited a strong dependence on external temperature variations. The test results proved useful to analyse the early-age behaviour of concrete.
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| 7. |
- Lagunas, M, et al.
(author)
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ARMA parameter estimation : Revisiting a cepstrum-based method
- 2008
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In: Proceedings of the 2008 IEEE International Conference on Acoustics, Speech, and Signal Processing: March 30 - April 4, 2008, Las Vegas, Nevada, USA. - 9781424414833 ; , s. 3685-3688
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Conference paper (peer-reviewed)
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| 8. |
- Mao, Y, et al.
(author)
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Vitamin D and asthma: A Mendelian randomization study
- 2017
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In: Annals of allergy, asthma & immunology : official publication of the American College of Allergy, Asthma, & Immunology. - : Elsevier BV. - 1534-4436. ; 119:1, s. 95-
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Journal article (peer-reviewed)
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| 9. |
- Revin, D.G., et al.
(author)
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Probing the electronic and optical properties of quantum cascade lasers under operating conditions
- 2006
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In: Proceedings of SPIE, the International Society for Optical Engineering. - : SPIE. ; 6386, s. 1-63860
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Conference paper (other academic/artistic)abstract
- We report the realisation of spectroscopic broadband transmission experiments on quantum cascade lasers (QCLs) under continuous wave operating conditions for drive currents up to laser threshold. This technique allows, for the first time, spectroscopic study of light transmission through the waveguide of QCLs in a very broad spectral range (λ~1.5-12 μm), limited only by the detector response and by interband absorption in the materials used in the QCL cladding regions. Waveguide transmittance spectra have been studied for both TE and TM polarization, for InGaAs/InAlAs/InP QCLs with different active region designs emitting at 7.4 and 10μm. The transmission measurements clearly show the depopulation of the lower laser levels as bias is increased, the onset and growth of optical amplification at the energy corresponding to the laser transitions as current is increased towards threshold, and the thermal filling of the second laser level and decrease of material gain at high temperatures. This technique also allows direct determination of key parameters such as the exact temperature of the laser core region under operating conditions, as well as the modal gain and waveguide loss coefficients.
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| 10. |
- Revin, L. S., et al.
(author)
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A Study of a Narrow-Band Receiving System of Cold-Electron Bolometers for the 220 and 240 GHz Channels using an Oscillator Based on the High-Temperature YBCO Superconductor
- 2019
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In: Radiophysics and Quantum Electronics (English Translation of Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika). - : Springer Science and Business Media LLC. - 0033-8443 .- 1573-9120. ; 62:7-8, s. 556-561
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Journal article (peer-reviewed)abstract
- We present the results of theoretical and experimental studies of the resonant properties of a single cell of a receiving system based on cold-electron bolometers (CEBs) with a double-slot antenna and curved coplanar lines, which is intended for receiving a signal in the range 220–240 GHz with a bandwidth of 5%. The resonant properties of a CEB located on the cryostat plate with a temperature of 0.3 K, are measured using an oscillator based on high-temperature superconductor (HTS) of yttrium barium copper oxide (YBCO), placed inside the same cryostat on a plate with a temperature of 4 K, which allows one to obtain smooth amplitude-frequency characteristics.
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