| 1. |
- Carracedo, Juan Carlos, et al.
(author)
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Geological Hazards in the Teide Volcanic Complex
- 2013
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In: Teide Volcano. - Berlin, Heidelberg : Springer Berlin/Heidelberg. - 9783642258923 - 9783642258930 ; , s. 249-272
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Book chapter (peer-reviewed)abstract
- The island of Tenerife displays contrasted densities of population, from the densely occupied coastal zones (including tourist resorts, airport, energy facilities, etc.) to the sparsely populated forests and mountainous highlands, where most of the recent volcanic events are located. Considering the low frequency of historical eruptions (compared to Hawaii or Reunion Island for example), the assessment of geological hazards must also rely on the analysis and interpretation of prehistorical events, going back to at least the Late Quaternary. In this chapter, we review the hazards related to Teide’s volcanism, but also those from increased seismicity and from slope instability. We discuss the origin of low magnitude earthquakes, and particularly the 2004 episode of unrest. New estimates on cumulative volumes for resurfacing by lava flows during the last few thousand years are provided to serve as a tool for building a lava flow hazard map of Tenerife. Hazards related to explosive activity are also considered and although possible, with phreatomagmatic eruptions being the most likely style anticipated, explosive events are of relatively low probability at Teide in the near future.
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| 2. |
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| 3. |
- Morales-España, Germán, 1982-, et al.
(author)
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An MIP Formulation for Joint Market-Clearing of Energy and Reserves Based on Ramp Scheduling
- 2014
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In: IEEE Transactions on Power Systems. - 0885-8950 .- 1558-0679. ; 29:1, s. 476-488
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Journal article (peer-reviewed)abstract
- The day-ahead unit-commitment (UC)-based market-clearing (MC) is widely acknowledged to be the most economically efficient mechanism for scheduling resources in power systems. In conventional UC problems, power schedules are used to represent the staircase energy schedule. However, the realizability of this schedule cannot be guaranteed due to the violation of ramping limits, and hence conventional UC formulations do not manage the flexibility of generating units efficiently. This paper provides a UC-based MC formulation, drawing a clear distinction between power and energy. Demand and generation are modeled as hourly piecewise-linear functions representing their instantaneous power trajectories. The schedule of generating unit output is no longer a staircase function, but a smoother function that respects all ramp constraints. The formulation represents in detail the operating reserves (online and offline), their time deployment limits (e.g., 15 min), their potential substitution, and their limits according to the actual ramp schedule. Startup and shutdown power trajectories are also modeled, and thus a more efficient energy and reserves schedule is obtained. The model is formulated as a mixed-integer programming (MIP) problem, and was tested with a 10-unit and 100-unit system in which its computational performance was compared with a traditional UC formulation.
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| 4. |
- Ferrada Stoehrel, Rodrigo, 1975-, et al.
(author)
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For the lulz : anonymous, aesthetics and affect
- 2014
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In: tripleC. - : Unified Theory of Information Research Group. - 1726-670X. ; 12:1, s. 238-264
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Journal article (peer-reviewed)abstract
- The focus of this paper is on different but connected areas of power – relating to things such as economic globalisation, surveillance, censorship/freedom, ‘terrorism’ and/or specific military activity – visually represented through online media, and intentionally produced to inform a wide spectrum of individuals and interest groups about global and local social injustices. Or, more importantly, produced and distributed with the purpose of providing users with possibilities to engage, bodily and emotionally, in diverse ways: may it be through physical antiwar/anti-wall street protests or hacktivist tactics (e.g. DDoS attacks).We examine a sample of videos, photographs and propaganda posters produced, and digitally distributed (2008-2013), by the fragmented body of activists united globally under the generic name of Anonymous. Analytically, we will draw upon Mouffe’s thoughts on ‘antagonism’ and ‘passion,’ Foucault’s ideas on international citizenship and the (ethical) ‘right to intervene’ (beyond governmentality), together with Sontag’s notion of institutional political inertia and the Deleuzian/Spinozian perspective on affect as a capacity for action. The goal is to analyse the ways in which Anonymous systematically inspire (not only) the radical and social imaginary but also other direct forms of action that have potential societal effects.
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| 5. |
- Ferrada Stoehrel, Rodrigo, 1975-
(author)
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Politics, Pleasure, Violence : Swedish Defence Propaganda in Social Media
- 2013
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In: MedieKultur. - Köpenhamn. - 0900-9671 .- 1901-9726. ; 29:55, s. 21-42
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Journal article (peer-reviewed)abstract
- In recent years, the Swedish Armed Forces have produced and distributed highly edited video clips on YouTube that show moving images of military activity. Alongside this development, mobile phone apps have emerged as an important channel through which the user can experience and take an interactive part in the staging of contemporary armed conflict. This article examines the way in which the aesthetic and affective experience of Swedish defence and security policy is socially and (media-)culturally (co-)constructed and how the official representation of Swedish military intervention (re)produces political and economic effects when these activities are distributed through traditional and social media. Based on Isabela and Norman Fairclough’s thoughts on political discourse, Michel Foucault’s dialectic idea of power/knowledge, and Sara Ahmed’s concept of the affective, I discuss how the Swedish digital military aesthetic is part of a broader political and economic practice that has consequences beyond the digital, the semiotic, and what might at first glance appear to be pure entertainment.
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| 6. |
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| 7. |
- Seratlic, Sanja, et al.
(author)
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Behavior of the surviving population of Lactobacillus plantarum 564 upon the application of pulsed electric fields
- 2013
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In: Innovative Food Science & Emerging Technologies. - : Elsevier BV. - 1466-8564. ; 17, s. 93-98
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Journal article (peer-reviewed)abstract
- The behavior of the surviving population of Lactobacillus plantarum 564 growing in MRS broth after pulsed electric field (PEF) treatments of different intensities was monitored by isothermal calorimetry, optical density and plate counts. Bacterial cells were treated with monopolar square pulses at varying nominal electric field strengths and number of pulses, corresponding to applied energies of 34.6, 65.8 and 658.1 J/cm(3). After the PEF treatment, samples were inoculated into the MRS broth and incubated at 37 degrees C. The presented results show that surviving bacterial cells resume growth after a treatment-dependent delay. Both the untreated and treated cultures had similar growth rates, but the latter showed a higher growth rate during the late-growth phase, and the growth rate increased with the intensity of applied electric field. After the PEF treatment, the surviving population of bacteria was less susceptible to killing by further PEF application, showing that this subpopulation was less sensitive to the PEF treatment and could grow again. Industrial relevance: The application of pulsed electric field (PEF) technology as a non-thermal alternative to traditional pasteurization of liquid foods has received considerable attention during the last years. Effective inactivation for most of the spoilage and pathogenic microorganisms has been shown in fruit and vegetable juices and milk with little or no impact on nutritional and sensorial properties of the food. However, very little is known about the growth abilities of the surviving population. Ensuring food safety requires a better understanding of the behavior of the surviving populations of microorganisms which may be recovering from sub lethal injury, such as PEF-induced stress. This paper reveals that the surviving population of the bacteria subjected to the PEF treatment could grow again, showing higher growth rates as the intensity of the PEF treatment increased. Also, the new bacterial population showed higher resistance to further PEF treatment. Therefore, for industrial application of the PEF technology, an in-depth characterization of surviving microorganisms in the treated product is required. Moreover, the evidence of bacterial persistence indicates that the PEF technology, as a non-thermal alternative to traditional pasteurization, could not completely replace thermal treatment, but can be applied as a supplement treatment. (C) 2012 Elsevier Ltd. All rights reserved.
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| 8. |
- Cai, Tao, et al.
(author)
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An implementation of cognitive resource management on LTE platform
- 2010
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In: 2010 IEEE 21st International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2010). - Piscataway, NJ : IEEE Communications Society. - 9781424480166 ; , s. 2663-2668
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Conference paper (peer-reviewed)abstract
- In this paper we describe an LTE based demonstrator of the Universal Link Layer API (ULLA) and Cognitive Resource Manager (CRM) modules that are developed in ARAGORN project. The demonstrated LTE system comprises one LTE TDD eNode B and one User Equipment (UE). We first introduce ULLA and CRM framework and then demonstrate their suitability to be implemented with the existing LTE equipments. We show how, through ULLA, CRM is able to obtain PHY/MAC status information of the link between the eNode B and UE, and in turn change system parameters to achieve better resource utilization and transmission efficiency. The control logic can be implemented with simple adaptation or policy-based intelligent methods. The platform clearly shows the feasibility to use ULLA/CRM architecture for radio resource management in a LTE network. It also shows the neutrality of ULLA/CRM mechanisms towards PHY/MAC characteristics of LTE technology platform; hence the platform is viable to flexibly switch between technology platforms (e.g. between LTE access and WiFi access) under the control of ULLA/CRM.
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| 9. |
- Cai, Tianqi, et al.
(author)
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Low bandgap polymers synthesized by FeCl(3) oxidative polymerization
- 2010
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In: Solar Energy Materials and Solar Cells. - : Elsevier BV. - 0927-0248. ; 94:7, s. 1275-1281
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Journal article (peer-reviewed)abstract
- Four low bandgap polymers, combining an alkyl thiophene donor with benzo[c][1,2,5]thiadiazole, 2,3-diphenylquinoxaline, 2,3-diphenylthieno[3,4-b]pyrazine and 6,7-diphenyl-[1,2,5]thiadiazolo[3,4-g] quinoxaline acceptors in a donor-acceptor-donor architecture, were synthesized via FeCl3 oxidative polymerization. The molecular weights of the polymers were improved by introducing o-dichlor-obenzene (ODCB) as the reaction solvent instead of the commonly used solvent, chloroform. The photophysical, electrochemical and photovoltaic properties of the resulting polymers were investigated and compared. The optical bandgaps of the polymers vary between 1.0 and 1.9 eV, which is promising for solar cells. The devices spin-coated from an ODCB solution of P1DB:[70]PCBM showed a power conversion efficiency of 1.08% with an open-circuit voltage of 0.91 V and a short-circuit current density of 3.36 mA cm(-2) under irradiation from an AM1.5G solar simulator (100 mW cm(-2)). (C) 2010 Elsevier B.V. All rights reserved.
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| 10. |
- Ehrenbolger, Kai, et al.
(author)
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Differences in structure and hibernation mechanism highlight diversification of the microsporidian ribosome
- 2020
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In: PLoS biology. - : Public Library of Science. - 1544-9173 .- 1545-7885. ; 18:10
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Journal article (peer-reviewed)abstract
- Assembling and powering ribosomes are energy-intensive processes requiring fine-tuned cellular control mechanisms. In organisms operating under strict nutrient limitations, such as pathogenic microsporidia, conservation of energy via ribosomal hibernation and recycling is critical. The mechanisms by which hibernation is achieved in microsporidia, however, remain poorly understood. Here, we present the cryo-electron microscopy structure of the ribosome from Paranosema locustae spores, bound by the conserved eukaryotic hibernation and recycling factor Lso2. The microsporidian Lso2 homolog adopts a V-shaped conformation to bridge the mRNA decoding site and the large subunit tRNA binding sites, providing a reversible ribosome inactivation mechanism. Although microsporidian ribosomes are highly compacted, the P. locustae ribosome retains several rRNA segments absent in other microsporidia, and represents an intermediate state of rRNA reduction. In one case, the near complete reduction of an expansion segment has resulted in a single bound nucleotide, which may act as an architectural co-factor to stabilize a protein-protein interface. The presented structure highlights the reductive evolution in these emerging pathogens and sheds light on a conserved mechanism for eukaryotic ribosome hibernation.
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