1,355,744 research outputs found
A preperfectoid approach to Robba rings
No full textWir konstruieren sogenannte praeperfektoide Raeume ausgehend von der Charaktervarietaet und definieren eine "praeperfektoide Version" des Robba-Rings sowie assoziierte Ringe beschraenkter Funktionen basierenden auf diesen Raeumen. Wir untersuchen phi-Moduln über diesen Ringen und zeigen, dass Basiswechsel von bestimmten phi-Moduln über einem der Ringe beschraenkter Funktionen zu bestimmten phi-Moduln über der praeperfektoiden Version des Robba-Rings eine Kategorienaequivalenz ist. Wir diskutieren außerdem die Konstruktion der praeperfektoiden offenen Einheitskreisscheibe und des assoziierten Robba-Rings
Can we use flood control infrastructures in forecast-based drought management in a drying climate?
No full textIn Southern Europe, the occurrence of increasingly frequent and severe droughts is challenging
existing water resources management. This trend calls for a proactive approach to drought
management through the development of efficient monitoring, warning and forecasting systems. In
this study we demonstrate the potential of using drought seasonal forecasts for promptly activating
a drought management strategy aimed at mitigating the conflict between competing water users in
the Lake Como system (Italy). Historically, in this region, water abundance was often the primary
concern rather than water scarcity; however, the system has recently experienced a number of severe
droughts with a consequent progressive lowering of the average lake level that have exacerbated
conflicts between agriculture and other sectors, including navigation, tourism, and ecosystems.
In this context, we propose a drought management strategy based on the use of a mobile dikes
system, originally designed to protect the shoreline of Como city from floods, as a means of reducing
the impacts of drought. The intent is to lift the dikes in view of dry seasons to increase the storage
capacity of the lake, with potential benefits both for irrigation supply and for low levels control. To
operate the dikes only in the event of an actual drought, a seasonal drought forecast is generated
with a statistical approach that relies on the teleconnection of El Niño Southern Oscillation (ENSO) with local hydro-climatic conditions. When drought emergency conditions are detected, the lake
operations switch from the historical policy to a new strategy specifically designed to manage the
system and address the tradeoffs between the competing users in drought conditions. Our results
show that many of the resulting solutions successfully improve the historical operation of the system
both in terms of irrigation supply and low levels control, without increasing the risk of flooding
Convolvulus supinus var. melliflorus Carine & Robba, comb. nov.
No full text2b. Convolvulus supinus var. melliflorus (Pau) Carine & Robba, comb. nov. Basionym: Convolvulus valentinus var. melliflorus Pau (1911: 6). Holotype: MOROCCO. Zeluan, Pau s.n., 2 May 1910 (MA!) Convolvulus suffruticosus var. sulfureus Battandier (1919: 61) ≡ C. valentinus var. sulfureus (Battandier) Maire & Wiczek in Maire (1934: 25). Holotype: Ducellier s.n., 1 May 1917 (MPU!) Convolvulus valentinus var. simulans Maire (1936: 27) ≡ Convolvulus valentinus f. simulans (Maire) Sauvage & Vindt (1954: 2). Lectotype (designated by Sa’ad, 1967): Nain 10, 15 June 1919 (MPU!). Convolvulus valentinus var. transiens Maire & Wilczek in Maire (1934: 25). Isotype: MOROCCO. Castellum Tazzougert, 1200 m, Maire & Wilczek s.n., 18 April 1933 (AL, MPU!) Convolvulus valentinus var. adpressipilis Maire & Wilczek in Maire (1934: 25) Isotype: MOROCCO. In pascuis deserti amnem Zerzef inter Esfoud et Bou-Denib, 950 m, Maire, & Wilczek s.n., April 1933 (P! MPU!). Convolvulus valentinus var. embergeri Sauvage & Vindt (1954: 2), nom. nud. Stems usually villous, rarely glabrous or glabrescent. Leaves ovate, narrowly elliptic or rarely deltoid, 10–25 mm long × 2–9 mm wide; base cuneate or truncate; apices acute or rarely obtuse; sparsely to densely villous on lower leaf surface, glabrous or glabrescent above. (fig. 1e) Distribution:— Morocco, extending northwards from the Western Sahara to the Beni Snassen mountains; outlying populations also occurring in Algeria (fig. 2c). Habitat:— Arid gravel, stony or sandy habitats. Phenology:— Flowering March–July(–August); fruiting June–July(–August?). Conservation:— Least Concern (IUCN 2001). Other specimens seen:— ALGERIA. Sidi-Maklouf, route de Laghirive, Chevallier s.n., 8 April 1897 (P); Laghouat, Chevallier 223, 12 April 1897 (P); Laghouat, col des sables, Chevallier s.n., 17 April 1897 (P); Laghouat, plaine entre l'Oued Mzi et le Dj. Mileb, Chevallier s.n., 17 April 1897 (P); AS 2: E. foot of Dj. Amour, 50 km from Laghouat to Aflou, Davis 58667, 3 June 1975 (BM); Bou-Saada (wilaya de M'Sida) a 2km au S d'Ain-Khermane et a environ 30km au N de Bou-Saada, Dubuis 13437, 3 May 1986 (RNG, MA, BC); Djebel Sahar, environs de Djelf(s)a, Prov. Alger, Reboud s.n., May 1854 (P); Ras-el-ma pres Bou Saada, Contantine [Bou Saada], Reboud s.n., 7 May 1865 (P). MOROCCO. Ouarzazate, pr. oppidium Tifoultout, Blanché, Fernández-Casas, Molero, Montserrat, & Romo 9664, 31 May 1985 (E). NW Sahara: Sand dune vegetation of Goulimina, Bramwell, Richardson & Murray 586, 2 April 1972 (RNG); Beni Snassen: 23 km from Uojda on road to Taza, Carine, Ait Lafkih, Rumsey & Rutherford 365, 16 June 2005 (BM, RNG, IAV); 49 km from Oujda on road to Taza. 1 km before road crosses Oued Bourdim. Carine, Ait Lafkih, Rumsey & Rutherford 368, 16 June 2005 (BM, RNG, IAV); 6 km E of Taourirt on Taourirt-El Ayoun Road. Carine, Ait Lafkih, Rumsey & Rutherford 370, 16 June 2005 (BM, RNG, IAV); Beni Snassen: 23 km W. from Oujda on road to Taza. Carine, Ait Lafkih, Rumsey & Rutherford 366, 16 June 2005 (BM, RNG, IAV); Sahara: El Abiod Sidi Cheikh, ravines, route de Gergville, Chevallier s.n., 9 May 1899 (P); Plateau de l'arid, N. de Midelt, Damblon 79/159, 24 June 1979 (RNG); ED. Goulmima to Ksar-es-Souk, Davis & Davis 49063, 4 April 1969 (BM, E); Ksar-es-Souk to Erfoud., Davis & Davis 49093, 5 April 1969 (BM, E); ED. Ziz Gorge (Ksar-es-Souk to Rich), Davis & Davis 49179, 7 April 1969 (BM, E); ED: 2 km NE of Goulmima, Else s.n, 1 April 1995 (RNG, BM); Gorges du Ziz, Else s.n., 6 Apil 1995 (RNG, BM); Ksar Es Souk, entre Er Rachidia y Midelt, Fernández Casas, Muñoz Garmendia, Susanna & Telleria FC7088, 18 June 1982 (RNG, MA); in lapidosis calcareis Atlantis Majorii orientalis propre Rich, Humbert s.n., April 1927 (MPU); Bou Denib: bords de l'oed Guir, 5–6 km from Bou Denib, Humbert s.n., April 1923, (P); R to Noulouya: Misour, Jahandiez 93, 28 April 1925 (BM, E, MA); R to Noulouya: Midelt, gorges de Oued Outat, Jahandiez 144, 2 May 1925 (BM); 51 km ENE of Ouarzazate, 8 km ENE of Skoura, on road to Boumalne du Dadès, Jury 14524, 24 March 1994 (RNG, BM); 121 km from Midelt along the road to Guercif, Jury 16928, 26 April 1995 (BM, RNG, MA); SE of Guercif, 1.8 km S of junction of Guercif - Oujda main road, Jury 16911, 26 April 1995 (BM, RNG, MA, BC); Prov. Er Rachida, road N. from Erfoud, 59 km from Rissani, 1 km N of Ksar Jdid, Jury 19114, 19 February 2002 (RNG); 89 km from Midelt on Azrou-Midelt road, just south of Boulojoul, Jury 19461, 30 May 2002 (RNG); Prov. Er Rachida, road N. from Erfoud, 36 km before Er Rachidia, above village of Ait Amira, Jury 19156, 19 February 2002 (RNG); Meski Spring, 11 km S.E. of Ksar-es-Souk, O. Ziz, Lambert 357, 20 April 1969 (BM); Prov d'Errachidia, Vallee de Ziz, Ksar Jdid (5 km au N. d'Aoufous, route 567 Errachidia-Erfoud, a env. 23 km du carrefour de la P32), Lambion & van den Sande 95/Ma/212, 14 March 1995 (RNG, MA); Prov. De Taza, Ighoudane, oued Boulajraf, Lambion & van den Sande 94/MA/176, 30 May 1994 (RNG); RICH (Errachiaouat), Lewalle 10526, 8 July 1982 (BM); Boudenit (Prov. Emachitie), Lewalle 13658, 3 April 1992 (BM); 10 km N de Midelt, Lewalle 9131, 2 July 1979 (P); Missour Gurcif, piste Moulaya, l'Hermite s.n., April 1939 (P); Beni-Ouziem, Maire & Wilczek s.n. (94112), 17 April 1933 (MA); propre Guercif, Maire & Wilczek s.n., 25 April 1933 (P, MPU); Bou-Denib-Salei, Maire & Wilczek 414, 17 April 1933 (MA); Teniet Zerzef (Tafilaet), Maire & Wilczek 312, 15 April 1933 (MA); Inter Erfoud et BenDenib, Maire & Wilczek s.n. (139502), 15 April 1933 (BC); In glareis torrentium vallei Dades inter Ikoura et Aït Yaga, Maire & Weiller 395, 21 June 1939 (MPU); Guercif, Carreterra a Outat-Oulad-el-Haj, a 4 km de Mahirija, Mateos 6809/95, 11 June 1995 (RNG); between Mertigmer and Mechra-Homadi 69 km from Nador, Mateos & Valdés BV636/93, 31 May 1993 (RNG, BC); Fes Missour- Aïn Guettara, plateau, Mordant 1100, 9 May 1969 (P); Guercif Tafrata, Mordant 1195, 14 May 1969 (P); Qsar-Es-Souq Outskirts of Midelt, on track to Cirque du Jaffar, Jbel Ayachi. Locality 6, OPTIMA ITER V 289, 10 June 1992 (RNG); Zeluan, Pau s.n. (94102), 2 May 1910 (MA); In montibus Largko/Sargho, Peltier s.n., 10 April 1939 (MPU); Mgoun/Haut Atlas oriental: vallei du Dadès en amour du Boumalne, Sauvage 12277, 1 April 1954 (MPU).Published as part of Carine, Mark A. & Robba, Lavinia, 2010, Taxonomy and evolution of the Convolvulus sabatius complex (Convolvulaceae), pp. 1-21 in Phytotaxa 14 on page 16, DOI: 10.11646/phytotaxa.14.1.1, http://zenodo.org/record/477870
Robust optimal demand-side management in smart grids
No full textSmart grids (SGs) are experiencing an increasing growth due to their economic, social and environmental benefits. The concept of SG has recently gained significant attention from the research community due to its ability to effectively integrate distributed energy resources (DER) including renewable energy sources (RES), energy storage systems (ESS) and the demand side management (DSM) programs. A SG can change the operation paradigm of the electric grid to ensure an efficient and sustainable electricity supply with lower losses and greater reliability and security. Despite these potential benefits, the massive penetration of DERs in SGs may impose new challenges to the system design and functioning. A substantial challenge arises from system uncertainties due to forecast errors. For instance, the inherent intermittency of RESs, the unpredictable changes in users’ electricity demand, and the volatility of the dynamic electricity price in electricity markets can inject considerable amounts of uncertainty into the electric grid.
Facing these challenges, this thesis investigates the integration of DERs and DSM programs as great sources of flexibility and essential elements for effective supply-demand balancing into SGs in the presence of uncertainty. Firstly, we present a comprehensive classification, review and analysis of existing approaches and findings for DSM to highlight key features and components of energy management systems for more flexible and intelligent grids. We provide a definition of DSM and introduce the reader to the functionalities and achievements of DSM applications in SGs. We then focus on the state-of-the-art decision-making and control approaches for DSM, followed by a comprehensive description of demand side applications detailed for smart users, distribution networks and transmission networks.
Afterwards, we characterize our novel methodologies presented in this thesis in two main parts including centralized and decentralized/distributed approaches.
In the first part, we present five novel robust centralized DSM approaches for the optimal scheduling of residential microgrids (MGs) comprising a number of interconnected end-use consumers with various types of electrical loads, RESs, ESSs, and plug-in electric vehicles (PEVs). The general objective of the optimal scheduling is minimizing the expected electricity cost while satisfying device/comfort/contractual constraints of the system under the uncertainties on RES generation and users’ electricity demand. In addition, we deal with the conservativeness of the proposed approaches for different scenarios in terms of the cost saving, the peak-to-average ratio (PAR), and the constraints’ violation rate. The proposed robust DSM approaches allow the decision maker (i.e., the energy manager of the system) to make a satisfactory trade-off between the electricity cost and constraints’ violation rate considering the system technical limits and the users’ comfort. We validate the effectiveness of the proposed approaches on several simulated case studies and provide comparisons and discussions on the results.
In the second part, we explore decentralized and distributed DSM approaches for the coordinated optimal charge control of PEVs in SGs. In particular, we develop a novel fully distributed control strategy for the optimal charging of large-scale PEV fleets aiming at the minimization of the aggregated charging cost and battery degradation, while satisfying the PEVs’ individual load requirements and the overall grid congestion limits. The proposed resolution algorithm requires a minimal shared information between PEVs that communicate only with their neighbors without relying on a central aggregator. Thus, it guarantees the PEV users’ privacy. We validate the proposed approach on numerical experiments with a large number of PEVs to demonstrate the ability of the approach in finding a global optimum solution with a favorable computational efficiency. Moreover, we present a new robust decentralized framework for day-ahead charge control of PEV fleets under uncertainties on the dynamic electricity price and the inelastic loads demand. The main objective of this work is minimizing both the overall charging cost and the aggregated battery degradation cost of PEVs while preserving the robustness of the solution against perturbations in the uncertain parameters. In addition, power congestion limits of the overall capacity of the distribution network and the PEVs’ individual needs such as charge level requirements and battery degradation cost are taken into account
Safety evaluation:practical use of collected data vehicle to obtain geometric information of existing roadway
No full text(phi, Gamma)-modules over noncommutative overconvergent and Robba rings
No full textWe construct noncommutative multidimensional versions of overconvergent power series rings and Robba rings. We show that the category of etale (phi, Gamma)-modules over certain completions of these rings is equivalent to the category of etale (phi, Gamma)-modules over classical overconvergent or Robba rings as the case may be (hence also to the category of p-adic Galois representations of Q(p)). In the case of Robba rings, the assumption of taleness is not necessary, so there exists a notion of trianguline objects in this sense
FIGURE 2 in Taxonomy and evolution of the Convolvulus sabatius complex (Convolvulaceae)
No full textFIGURE 2. Distributions of taxa in the C. sabatius complex. (a) C. valentinus, (b) C. sabatius subsp. mauritanicus (open circles) and C. sabatius subsp. sabatius (closed diamonds), (c) C. supinus var. supinus (open circles) and C. supinus var. melliflorus (closed circles).Published as part of Carine, Mark A. & Robba, Lavinia, 2010, Taxonomy and evolution of the Convolvulus sabatius complex (Convolvulaceae), pp. 1-21 in Phytotaxa 14 on page 6, DOI: 10.11646/phytotaxa.14.1.1, http://zenodo.org/record/477870
Artificial intelligence: a new editor limiting self-citation malpractice
No full textLetter to the editor
In search of socially responsible investors: A latent profile analysis
No full textIntroduction: Socially responsible investments (SRI) increased their popularity among investors over the last two decades. However, there is still a lack of knowledge on socially responsible investors’ characteristics and motivations behind the decision to invest in SRI. The present paper aims at filling this gap by profiling current and potential sustainable investors.
Method: Cross-sectional data from a representative sample of Italian consumers (N = 1,002) was used to perform a Latent Profile Analysis (LPA), a clustering technique, and identify various sub-groups within the respondents. Subsequently, chi-square test and one-way ANOVA were performed to determine which profile(s) was mostly associated with current and potential socially responsible investing.
Results and Discussion: Five profiles of consumers were identified through the LPA, each one differently associated with the likelihood of investing in socially responsible products. The profile that best describes sustainable investors is characterized by high levels of knowledge toward SRI, risk appetite, positive attitudes on SRI, personal norms, perceived behavioral control, environmental concerns, and connectedness to nature. These findings suggest that non-financial aspects, namely psychological characteristics such as attitudes and personal values, play a key role in the decision to invest responsibly as well
A bi-level approach for the optimal control of flows through a network
No full textThe operational management of traffic flows, controlled
by different decision makers (that do not exchange
information) through a network, gives rise to a common modeling
framework that may find application within different research
areas: road traffic control, hazardous materials transportation,
telecommunication networks, energy systems. In this paper, a
general decision architecture is considered and an application is
provided to the case of the management of fleets of vehicles
that transport hazardous materials (hazmat). The considered
architecture takes into account the presence of different decision
makers. The problem is also characterized by the presence
of several (possibly conflicting) objectives. In the case of hazmat
transportation, such objectives may be the reduction of
economic costs and the containment of the risk (for vehicles
and infrastructures). The considered model includes an upperlevel
decision maker that can take decisions affecting the utility
functions of the lower-level decision makers (LDMs), for example,
changing the tolls for the LDMs, but leaving to such LDMs some
decision capability. A specific case study is considered, relevant
to the management of vehicles carrying hazmat through a critical
infrastructure
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