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  • 2020-2024  (38)
  • 1985-1989  (28)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Decisions in economics and finance 8 (1985), S. 123-140 
    ISSN: 1129-6569
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Riassunto Il lavoro estende un modello macroeconomico dell'economia irregolare che è stato proposto da B. Contini, F. Cugno e M. Galeotti nel 1984. Come nello schema originario la dimensione di ciascun settore economico (quello regolare e quello irregolare) dipende dall'andamento dei costi ad esso relativi, mentre il tasso di inflazione è legato ai prezzi ed alle quote dei due diversi settori. Noi non trattiamo, tuttavia, il differenziale tra i tassi di crescita della produttività,k, come una grandezza costante, e scriviamo, invece, una nuova equazione differenziale che ne descrive la dinamica. In questo modo si ottiene uno spazio delle fasi di dimensione tre che è stratificato da varietà invarianti di dimensione due. Ciascuna di queste varietà contiene esattamente un punto di equilibrio, che si prova essere un attrattore globale, sotto opportune condizioni al bordo. Dimostriamo, infine, che nell'ambito del nostro modello è formalemente possibile controllare il settore irregolare; questo ci porta al problema economico di quali politiche centrali siano atte a far conseguire un obbiettivo fissato relativamente alla dimensione della attività regolari ed irregolari in cui si articola il sistema.
    Notes: Abstract The macroeconomic model of an irregular economy proposed by B. Contini, F. Cugno and M. Galeotti (1984) is extended by increasing the number of state variables and thus the dimension of the phase space for the relative dynamical system. By showing, through standard Liapunov methods, the non existence of closed non trivial orbits, the global attractivity of the equilibrium set is proved, under suitable boundary conditions. Control policies leading the economy to a desired equilibrium state are seen to be feasible, and ≪central≫ instruments which appear to be effective in this respect are briefly discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Metroeconomica 40 (1989), S. 0 
    ISSN: 1467-999X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: We study three different versions of the Kaldor's 1940 Business-Cycle Model (13, and we show that they can all be reduced, through suitable changes of variables, to a planar dynamical system of Lienard-type.By applying a classical result due to A. Filippov (8) and a quite recent theorem of the Chinese mathematician Zhang Zhi Fen (19, it is easily proved that our systems present a unique attracting limit-cycle encircling the only existing equilibrium.Our analysis does not require any extra hypothesis regarding the symmetry of the investment and saving functions, except the «classical» ones and those needed to reducing the system to Lienard form.It extends, so far, a few previous results obtained by H.W. Lorenz (16) on the very same model.
    Type of Medium: Electronic Resource
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  • 3
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    BIT 29 (1989), S. 2-13 
    ISSN: 1572-9125
    Keywords: E2
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The aim of this paper is to describe a new approach to building minimal and perfect hash functions for a predefined set of keys. Several papers have dealt with this problem and proposed various kinds of functions. This study is based on a function whose address depends both on the letter codes and the letter position in the key, and therefore represents an extension of Cichelli's function. The weights associated with the position are considered to be fixed, and letter code computing is considered to be an interpolation problem. As a result, hash building only requires the solution of an algebraic linear system and then the time complexity is polynomialO(n 3).
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 27 (1989), S. 299-321 
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The stiffness matrix of a beam made of composite superconductor elements is derived. The effects of friction between conductors through the insulation layers are taken into account. Furthermore, the effects of strand transposition of the wires, already studied by the authors, are included in the model.Some applications of the proposed approach to superconductor layouts proposed for the NET (Next European Torus) toroidal and poloidal field coils are shown. These indicate that the effects of slip are not negligible and should be taken into account in a more reliable structural analysis of the coil system. Parametric studies with varying width and heights of the insulation layer have been also carried out and the corresponding diagrams are shown here.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 68 (1985), S. 1617-1623 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Kinetics of Monomolecular Surface Modification of 4-(Trichlorosilylmethyl)benzonitrile on Germanium by Means of FTIR ExperimentsA Fourier transform-attenuated total internal reflection-infrared spectroscopy (FT-ATR-IR) technique is described, which allows to observe the kinetics of monomolecular surface modification on materials which are feasible to total internal reflection experiments in an appropriate wavelength region. First results are reported for the reaction of 4-(trichlorosilymethyl)benzonitrile on germanium. The reaction is slower than expected and is only completed after approximately 4 h.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Publication Date: 2024-03-14
    Description: We used carbon and nitrogen stable isotope (δ13C and δ15N) analyses to investigate the trophic network of the CWC reef habitat off Angola (SE Atlantic Ocean). Samples were collected in January 2016 during the M122 (“ANNA”) expedition on board R/V Meteor. In total, 18 reef sites, including seven CWC mound settings over a bathymetric range of 250 to 530 m water depth, were sampled for stable isotope analyses. Samples of organisms belonging to the taxa Porifera, Cnidaria, Arthropoda, Annelida, Echinodermata and Chordata were collected by means of a box corer, a Van-Veen grab sampler and the Remotely Operated Vehicle (ROV) SQUID (MARUM, Bremen, Germany). To investigate potential food sources of the benthic megafauna, three types of Particulate Organic Matter (POM) were collected: Suspended Particulate Organic Matter (SPOM) was collected with a McLane phytoplankton pump; settling SPOM was collected with a sediment trap (SPOM trap) and sediment samples were collected with a box corer and a grab sampler. Analyses of benthic megafauna were performed using a Elementar IsoPrime 100 isotope ratio–mass spectrometry (IR–MS) (IsoPrime Ltd.) coupled to a CNS elemental analyzer (Elementar Vario Pyro Cube EA CNS; Elementar Analysensysteme GmbH), while POM samples were analyzed by a Delta V Advantage IR–MS coupled online to an elemental analyzer (Flash 2000 EA-IRMS) by a ConFlo IV (Thermo Fisher Scientific Inc.). Vienna Pee Dee belemnite (V.P.D.B.) for carbon, and atmospheric N2 (Air) for nitrogen, were used as reference materials, and stable isotope values are reported in respect to that.
    Keywords: ALBEX lander; Angola; Angola CWC reefs; Class; DATE/TIME; Eastern South Atlantic; ELEVATION; Event label; Family; Gear; Genus; GeoB20904-1; GeoB20910-1; GeoB20913-1; GeoB20916-1; GeoB20917-1; GeoB20917-2; GeoB20920-1; GeoB20920-4; GeoB20921-1; GeoB20927-1; GeoB20930-1; GeoB20933-2; GeoB20933-3; GeoB20934-2; GeoB20940-1; GeoB20953-2; GeoB20955-1; GeoB20957-1; GeoB20957-3; Giant box corer; GKG; Grab; GRAB; iAtlantic; Integrated Assessment of Atlantic Marine Ecosystems in Space and Time; Isotope ratio mass spectrometry; LATITUDE; LONGITUDE; M122; M122_087-1; M122_093-1; M122_096-1; M122_099-1; M122_100-1; M122_103-1; M122_104-1; M122_110-1; M122_113-1; M122_116-2; M122_116-3; M122_117-2; M122_124-1; M122_137-2; M122_139-1; M122_141-1; Meteor (1986); NIOZL; Order; Phylum; Remote operated vehicle; ROV; Sample code/label; Sample type; SE Atlantic; Site; Species; Species, unique identification (Semantic URI); Species, unique identification (URI); Stable carbon isotope (δ13C); stable nitrogen isotope (δ15N); δ13C; δ13C, standard deviation; δ15N; δ15N, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 961 data points
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  • 8
    Publication Date: 2024-03-23
    Description: A 9-month aquarium experiment with the cold-water Dendrophyllia cornigera was conducted to investigate the single and combined effects of warming, acidification and deoxygenation on its ecophysiological response. The experiment took place at the Aquarium finisterrae (A Coruña, Spain) between 2022-05-06 and 2023-02-24. Treatment values for each parameter (current in situ vs. climate change) were: 12 °C and 15 °C (temperature); ~7.99 and 7.69 (pH); ~8.63 mg/L and 6.45 mg/L (dissolved oxygen concentration). A total of eight treatments (with 3 replicates each, 5 L aquaria) were set up. Dry mass of the coral nubbins (3 per experimental aquarium) was assessed by means of the buoyant weight technique (Jokiel et al. 1978, Davies, 1989), using an analytical balance (OHAUS AX124, precision 0.1 mg). The dry mass was calculated considering the nubbin net weight in water, the water density and the skeletal density of D. cornigera (2.63 g/cm3; Movilla et al. 2014). Measurements were performed just once the acclimation time finished and after 2 , 4, 6 and 9 months under the experimental conditions. Skeletal growth rates were calculated as the slope of the linear regression between the logarithmically transformed dry mass and the experimental time (%/day) (Orejas et al. 2011).
    Keywords: Buoyant weighing technique according to Davies (1989); Dendrophyllia_cornigera_Coral_Bycatch_A_Coruna; Dendrophyllia cornigera; Dendrophyllia cornigera, skeletal growth rate; Experimental treatment; growth; iAtlantic; Integrated Assessment of Atlantic Marine Ecosystems in Space and Time; Laboratory experiment; Multiple stressors; NE Atlantic; North Atlantic Ocean; NW Spain; Replicate; Species; Species, unique identification (Semantic URI); Species, unique identification (URI); Specimen identification; Type of study
    Type: Dataset
    Format: text/tab-separated-values, 576 data points
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  • 9
    Publication Date: 2024-03-18
    Description: A 9-month aquarium experiment with the cold-water Dendrophyllia cornigera was conducted to investigate the single and combined effects of warming, acidification and deoxygenation on its ecophysiological response. The experiment took place at the Aquarium finisterrae (A Coruña, Spain) between 2022-05-06 and 2023-02-24. Treatment values for each parameter (current in situ vs. climate change) were: 12 °C and 15 °C (temperature); ~7.99 and 7.69 (pH); ~8.63 mg/L and 6.45 mg/L (dissolved oxygen concentration). A total of eight treatments (with 3 replicates each, 5 L aquaria) were set up. Concentrations of dissolved nitrates, nitrite, silicate and phosphate were analysed from each experimental aquaria after one, six and nine months. Inorganic nutrient concentrations in seawater were determined using a SFA (Segmented Flow Autoanalyzer) (Aminot & Kérouel, 2007) with a SEAL Analytical QuAAtro analyzer using established colorimetric methods (Hydes et al. 2010 & Becker et al. 2020). RMNs (Reference Material for nutrients in seawater) with different concentration ranges were used for quality control and accuracy of our analysis. Low nutrient seawater (surface seawater filtered and aged) is also used to control low nutrient concentrations.
    Keywords: Colorimetric using QuAAtro39 AA (Seal Analytical); DATE/TIME; Dendrophyllia_cornigera_Coral_Bycatch_A_Coruna; experimental data; Experiment duration; iAtlantic; Integrated Assessment of Atlantic Marine Ecosystems in Space and Time; Laboratory experiment; NE Atlantic; Nitrate and Nitrite; Nitrite; North Atlantic Ocean; nutrients; NW Spain; Phosphate; Replicate; Salinity; Silicate; Species; Species, unique identification (Semantic URI); Species, unique identification (URI); Treatment; Treatment: temperature; Type of study; WTW Multi Set 350i multiparameter probe
    Type: Dataset
    Format: text/tab-separated-values, 864 data points
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  • 10
    Publication Date: 2024-03-19
    Description: A 9-month aquarium experiment with the cold-water Dendrophyllia cornigera was conducted to investigate the single and combined effects of warming, acidification and deoxygenation on its ecophysiological response. The experiment took place at the Aquarium finisterrae (A Coruña, Spain) between 2022-05-06 and 2023-02-24. Treatment values for each parameter (current in situ vs. climate change) were: 12 °C and 15 °C (temperature); ~7.99 and 7.69 (pH); ~8.63 mg/L and 6.45 mg/L (dissolved oxygen concentration). A total of eight treatments (with 3 replicates each, 5 L aquaria) were set up. Prokaryotes were quantified by flow citometry (CytoFLEXflex S, Beckman Coulter) as previously described by Gasol et al. (1999) with our own adjustment of the scatter settings to more accurately resolve these cells with the new CytoFLEX flow cytometry technology. Measurements were performed every month from different parts of the aquaria setup: the input seawater, the reservoir tank (after the filtration of seawater to 5 µm and before the UV lamp) and every experimental aquaria.
    Keywords: Atlantic Ocean; Comment; DATE/TIME; Dendrophyllia_Bycatch; Experimental treatment; Experiment duration; Flow cytometer, Beckman Coulter, CytoFLEX S (N-V-B-R); flow cytometry; iAtlantic; Integrated Assessment of Atlantic Marine Ecosystems in Space and Time; Laboratory experiment; NE Atlantic; NW Spain; Prokaryotes; prokaryotic abundance; Replicate; Species; Species, unique identification (Semantic URI); Species, unique identification (URI); Type of study
    Type: Dataset
    Format: text/tab-separated-values, 1260 data points
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