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1
Content available A comparison of algorithms for separation of synchronous subspaces
100%
Almeida M. , Bioucas-Dias J. , Vigário R. , Oja E.
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2012
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tom Vol. 60, nr 3
455-460
EN
Independent Subspace Analysis (ISA) consists in separating sets (subspaces) of dependent sources, with different sets being independent of each other. While a few algorithms have been proposed to solve this problem, they are all completely general in the sense that they do not make any assumptions on the intra-subspace dependency. In this paper, we address the ISA problem in the specific context of Separation of Synchronous Sources (SSS), i.e., we aim to solve the ISA problem when the intra-subspace dependency is known to be perfect phase synchrony between all sources in that subspace. We compare multiple algorithmic solutions for this problem, by analyzing their performance on an MEG-like dataset.
2
Content available remote Energy of efficiency for typical 2-floor buildings in Portugal
100%
Bragança L. , Almeida M. , Mendes J.
Archives of Civil Engineering
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2000
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tom Vol. 46, nr 4
575-584
EN
The purpose of this paper is to develop a relative evaluation, from the energetic point of view, of different building layouts. Buildings can be classified, according to their position within the lot, as perimeter yard buildings, rear yard buildings, and side yard buildings. This classification covers the layout solutions traditionally adopted by architects for 2-floor residential buildings. The thermal performance of each building layout was evaluated through the quantification of its energetic consumption (per square meter of built area), for the heating and cooling seasons, and according to the geographic orientation. The simulation tool used in this evaluation is based on the Transfer Function Method. The results obtained showed that the rear yard buildings have the better thermal performance, with an average energy consumption that is around 40addition, for all building layouts studied, the North-South orientation requires the minimum energetic consumption to maintain comfortable indoor air temperature.
PL
Zadaniem pracy jest stworzenie porównawczej oceny — z punktu widzenia energetyki — różnych rodzajów rozplanowania budynków. Zależnie od ich usytuowania na działce, budynki można podzielić na wolnostojące, szeregowe i bliźniaki. Taki podział pokrywa wszystkie moźliwości rozwiązań usytuowania przyjmowane tradycyjnie przez architektów dla dwukondygnacyjnych budynków mieszkalnych. Wydajność termiczna każdego rozplanowania budynków została oceniona przez kwantyfikację zużycia energii (na m2 zabudowy) w sezonach grzewczym i chłodniczym oraz w zależności od kierunku ustawienia względem stron świata. Narzędzie symulacji zastosowane do tej oceny jest oparte na Metodzie Funkcji Przeniesienia. Otrzymane wyniki pokazują, że budynki szeregowe mają lepszą wydajność termiczną przy zużyciu energii mniejszym o 40% od pozostałych przypadków. Ponadto, dla wszystkich rozpatrywanych rozplanowań kierunek ustawienia północ-południe wymaga najmniej zużycia energii dla zapewnienia komfortowej temperatury wnętrz.
3
Content available Research on the Portuguese building stock and its impacts on energy consumption – an average U-value approach
100%
Sousa J. , Bragança L. , Almeida M. , Silva P.
Archives of Civil Engineering
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2013
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tom Vol. 59, nr 4
523--546
EN
The article aims to evaluate the Portuguese building stock energy policies and strategy for energy saving in buildings among the EU members. It was found out the average heat transfer coefficients of the main structural elements of Portuguese Buildings and analyzed the U-values of this elements considering different time periods. The fundamentals of this study were funded by the Agency for Development and Innovation (ADI) and co-financed by the European Regional Development Fund (FEDER) through the Operational Program for Competitiveness Factors (POFC) assigned to the Building Physics and Construction Technology Laboratory with the reference SB Tool SPT_2011_4.
4
Content available Phytosterol and alpha-lipoic acid conjugates: synthesis, free radical scavenging capacity and RP-LC-MS-APCI analysis
88%
Madawala S. R. P. , Andersson R. E. , Jastrebova J. A. , Almeida M. , Dutta P. C.
Polish Journal of Food and Nutrition Sciences
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2012
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tom 62
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nr 3
EN
Plant sterols (PS) are bioactive compounds effective in reducing plasma cholesterol. Fatty acid esters of PS have improved solubility and blending properties when utilized in various food products. Naturally occurring α-lipoic acid (LA) and its reduced form dihydrolipoic acid (DHLA) are known for their antioxidant activity. In addition, they have shown an array of health benefi cial properties against obesity, diabetes, cancer, cardiovascular and infl ammatory diseases etc. Different LA conjugates have been reported to have increased bioactivity compared to the parent compounds. The objective of this study was to synthesize PS esters of LA (PSLA) and DHLA (PSDHLA) in order to increase their cholesterol lowering effect and reducing the risk of atherosclerosis with additional health benefi ts e.g. against oxidative stress. Synthesis of PSLA and PSDHLA was performed with a pure PS mixture of β-sitosterol, stigmasterol, campesterol and brassicasterol. The free radical scavenging capacity of the conjugates was assessed by the DPPH method. Remaining percentage of DPPH free radicals was measured at the steady state for different concentrations of PSLA and PSDHLA. High free radical scavenging capacity was observed for PSDHLA compared with PSLA. Effi cient concentration EC50 as a molar ratio for PSDHLA was 0.43. The derivatives were analyzed by RP-HPLC-MS-APCI. The order of the elution times of the compounds observed in HPLC-MS analysis was PS< PSDHLA< PSLA. Baseline separation was not achieved between campesterol and stigmasterol and their derivatives. These compounds could be identifi ed by their characteristic fragment ions from the mass spectral data.
5
Phytosterols and alpha-lipoic acid conjugates: synthesis, LC-MS analysis and free radical scavenging capacity
88%
Madawala S. R. P. , Andersson R. E. , Jastrebova J. A. , Almeida M. , Dutta P. C.
Polish Journal of Food and Nutrition Sciences
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2011
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tom 61
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nr Suppl.1
6
Content available remote Historical building dating: A multidisciplinary study of the Convento de São Francisco (Coimbra, Portugal)
75%
Stella G. , Almeida L. , Basílio L. , Pasquale S. , Dinis J. , Almeida M. , Gueli A. M.
Geochronometria
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2018
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tom Vol. 45, no. 1
119--129
EN
Cross-dating of bricks and mortars from historical building, through thermal (TL) and optically stimulated (OSL) luminescence have achieved good accuracy and precision. However this approach is, in many cases, not exhaustive especially for buildings with different construction phases closely temporally spaced to each other. The uncertainties of experimental data added to the reuse of old bricks and/or the presence of mortars applied on restorations represent the main limits to obtain the complete chronology. In the case of the Convento de S. Francisco (Coimbra, Portugal), the dating results were crossed with the stratigraphic study of the building, mineralogical characterization by XRD and colorimetric data of the mortar samples. Thanks to luminescence ages, mineralogical composition and color specification, two phases of construction were identified: the first from the 17th century and the first half of the 18th century and the second from the second half of the 18th century to the first half of the 19th century. These results were confirmed by mineralogical characterization and colorimetric measurements of mortars that identify two different types of materials in aggregate/binder ratio terms and superficial optical characteristics.
7
Monitoring PRRSV w stadach loch - pobieranie płynu ustnego od prosiąt ssących
63%
Almeida M. , Philips R. , Linhares D.
Weterynaria w Terenie
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2017
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tom 11
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nr 4
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