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Wyświetlanie 1-10 z 115
Tytuł:
Sufficient optimality criteria and duality for multiobjective variational control problems with B-(p,r)-invex function
Autorzy:
Antczak, T.
Jimenez, M. A.
Tematy:
multiobjective variational control problems
efficient solution
B-(p, r)-invex functions
optimality conditions
duality
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Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:
https://bibliotekanauki.pl/articles/255711.pdf  Link otwiera się w nowym oknie
Opis:
In this paper, we generalize the notion of B-(p, r)-invexity introduced by Antczak in [A class of B-(p; r)-invex functions and mathematical programming, J. Math. Anal. Appl. 286 (2003), 187–206] for scalar optimization problems to the case of a multiobjective variational programming control problem. For such nonconvex vector optimization problems, we prove sufficient optimality conditions under the assumptions that the functions constituting them are B-(p, r)-invex. Further, for the considered multiobjective variational control problem, its dual multiobjective variational control problem in the sense of Mond-Weir is given and several duality results are established under B-(p, r)-invexity.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Initial approach to safety on cruises ships: structure of the sector
Autorzy:
Arranz, S.
Piniella, F.
Cerbán-Jiménez, M. M.
Tematy:
safety at sea
Port State Control (PSC)
International Association of Cruise Lines (CLIA)
EQUASIS
US Coast Guard
PSC inspection
cruise ships
passanger cruises
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Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Powiązania:
https://bibliotekanauki.pl/articles/116830.pdf  Link otwiera się w nowym oknie
Opis:
The importance of safety on ships is beyond dispute, however, there are some types of ship for which this matter deserves special consideration. One of these types of ships are passenger cruises, due to the high number of human lives that travel on board. For this reason, we believe that a particular study of safety in cruise ships is needed. The Port State Control (PSC) mechanism of coastal States to try to ensure security in their territorial waters in respect of the traffic of foreign ships may, a priori, be an impartial and reliable indicator of security, according to the deficiencies it detect in ships and the detentions that carried out. Thus, we will use the PSC inspections in this paper. The source of information about PSC inspections is EQUASIS, which is the information system of the majority of regional agreements PSC and US Coast Guard. The study period is 5 years (2012-2016) and the cruise ships analysed are belonging to the International Association of Cruise Lines (CLIA). The objective of this work is an initial approach to safety on cruise ships and the structure of the sector according several factors (company, cruise type, age and pavilion).
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Norm attaining multilinear forms and polynomials on preduals of Lorentz sequence spaces
Autorzy:
Jimenéz Sevilla, M.
Payá, Rafael
Tematy:
norm attaining multilinear forms and polynomials
weakly continuous multilinear forms and polynomials
Lorentz sequence spaces
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Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Powiązania:
https://bibliotekanauki.pl/articles/1218802.pdf  Link otwiera się w nowym oknie
Opis:
For each natural number N, we give an example of a Banach space X such that the set of norm attaining N-linear forms is dense in the space of all continuous N-linear forms on X, but there are continuous (N+1)-linear forms on X which cannot be approximated by norm attaining (N+1)-linear forms. Actually,X is the canonical predual of a suitable Lorentz sequence space. We also get the analogous result for homogeneous polynomials.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Convex sets in Banach spaces and a problem of Rolewicz
Autorzy:
Granero, A. S.
Jiménez Sevilla, M.
Moreno, J.
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Powiązania:
https://bibliotekanauki.pl/articles/1218494.pdf  Link otwiera się w nowym oknie
Opis:
Let $B_x$ be the set of all closed, convex and bounded subsets of a Banach space X equipped with the Hausdorff metric. In the first part of this work we study the density character of $B_x$ and investigate its connections with the geometry of the space, in particular with a property shared by the spaces of Shelah and Kunen. In the second part we are concerned with the problem of Rolewicz, namely the existence of support sets, for the case of spaces C(K).
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiocatalytic degradation of dissolved organic compounds in wastewater
Autorzy:
Jiménez-Becerril, J.
Moreno-López, A.
Jiménez-Reyes, M.
Tematy:
wastewater
dissolved organic carbon
radiocatalysis
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Wydawca:
Instytut Chemii i Techniki Jądrowej
Powiązania:
https://bibliotekanauki.pl/articles/148022.pdf  Link otwiera się w nowym oknie
Opis:
Wastewater containing a high concentration of organic substances was exposed to gamma radiolysis in the presence and absence of a catalyst (TiO2); radiolysis and radiocatalysis were performed by means of continuous and discontinuous irradiation. Dissolved organic carbon (DOC) was the parameter used to estimate the concentration of organic compounds without interference by the high mineral content. The data was well fitted to the pseudo-first-order kinetic model of Langmuir-Hinshelwood. From a [DOC]0 = 140 ± 7 mg/L, the higher DOC degradation (74%) and apparent rate constant (Kapp = 0.083 h−1) were found using discontinuous radiocatalysis. This process could be an alternative method of treatment of industrial or municipal wastewater.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal pattern of the chlorophyll-a in a coastal lagoon from the Southern Baja California (Mexico), described with in situ observations and MODIS-Aqua imagery
Autorzy:
Jimenez-Quiroz, M.C.
Martell-Dubois, R.
Cervantes-Duarte, R.
Cerdeira-Estrada, S.
Tematy:
chlorophyll a
coastal lagoon
remote sensing
transitional zone
climatology
seasonal pattern
phytoplankton biomass
distribution
multivariate statistical method
MODIS-Aqua data
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Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/2078912.pdf  Link otwiera się w nowym oknie
Opis:
This study aims to estimate, with a climatology perspective, the average seasonal pattern of phytoplankton biomass (SP-PBavg) and its distribution in Bahia Magdalena (Mexico) as a baseline to evaluate PB changes in future studies. This lagoon is in a semi-arid region, lacks river discharges, and channels with vegetation are limited at the north and south zones. SP-PBavg was estimated with chlorophyll-a (chl-a) data obtained in 21 sites on daily MODISAqua imagery (2002—2013; n = 2,418) from a ready-to-use public database. The first step was to establish criteria to use imagery and validate with in situ observations taken in 14 sites (2002—2011; n = 312). MODIS-Aqua overestimated chl-a (mean ± confidence interval95: 5.09 ± 0.97 mg m−3; n = 225); with differences among sites. There were no differences near the inlet lagoon (p <0.05), where the water characteristics are Case-1 while values were significantly higher in the eastern shore and two or three times higher in the mouth of north and south channels, whose water characteristics are similar to Case-2. Multivariate statistical methods allow defining zones into the lagoon and describe their SP-PBavg with both in situ and MODIS Aqua data, but the former’s sample size was small, and the patterns were only delineated. In the inlet surroundings, chl-a peaks from March/April to June/July. On the eastern shore, where MODIS Aqua and in situ data were correlated, despite concentration differences, chla is higher from March/April to October, with peaks in June and September. In the mouth of internal channels, chl-a was higher than other sites and during a longer period; however, the very high MODIS-Aqua values suggest that the satellite also detects organic matter supplied by phytoplankton and other vegetables, which explain the high lagoon’s productivity. These results validate the use of MODIS Aqua imagery to describe the chl-a seasonal patterns in the sea’s vicinity
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption of Zn2+ from solutions on manganese oxide obtained via ozone precipitation reaction
Autorzy:
Contreras-Bustos, R.
Espejel-Ayala, F.
Cercado-Quezada, B.
Jiménez-Becerril, J.
Jiménez-Reyes, M.
Tematy:
manganese dioxide
aqueous Zn(II) solutions
adsorption process
Pokaż więcej
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:
https://bibliotekanauki.pl/articles/778323.pdf  Link otwiera się w nowym oknie
Opis:
Synthesis via ozone precipitation reaction was used to obtain manganese dioxide (OMD) and it was probed as an adsorbent for zinc ions. Adsorption was followed along shaking time and increasing ratio [NO3 –] / [Zn2+], and isotherms were obtained at different pH values and in the presence of several anions (chloride, nitrate, sulphate, and acetate). It was found that adsorption equilibrium is fast and follows the pseudo-second order model (qe = 34 ±1 mg/g and K = 0.07 ±0.01 g/mg h). Isotherms were fitted to Langmuir, Freundlich, and Langmuir-Freundlich models, and the best fitting was found with the last one. The process is dependent on pH and the efficiency increases from pH 1 to 4. The ratio [NO3 –] / [Zn2+] up to 3 does not seem to change the behaviour of the process. Regarding the anions, the efficiency of Zn(II) adsorption occurs according to: acetate > nitrate and sulphate > chloride. Manganese oxide obtained via ozonization is an excellent adsorbent for zinc ions.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 115

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