ALBERT

Notes: Abstract We formulate a microeconomic model of residential location choice behavior as an aggregate of the individual behaviors of household members, subject to individual time constraints and a common income budget. A simplified version of the model is estimated from stated preference rank-order data, yielding a function that may be interpretated as a conditional indirect utility function. We consider Box-Tukey transformations, segmentation by income class, and a consistent treatment of data at different rank depths using the simultaneous mixed-estimation method. Measures of the household's willingness-to-pay (through rents) for reducing travel times to work and study in the short run, are interpreted as subjective values of time and compared with such values derived from mode choice models. Our results are plausible, and consistent with recent findings showing that the short-run benefits of transport projects derived by transport models are larger than benefits measured at the land use system.

Notes: We extend the well-known transport users' benefits measure (TUB) for the doubly-constrained spatial interaction model derived by Williams (1976). The original formula expresses the TUB as composed by two terms associated with the origin and the destination zones. First, the TUB is associated here with trips instead of zones, providing a natural interpretation as a rule-of-a-half measure of benefit under inelastic demand (for the short-run case). Second, a TUB formula for the long-run case is derived, that is, when the total number of trips, trip origins, and trip destinations change. We then propose updated measures of accessibility for location behavior.

Notes: In this paper we develop a framework to describe the individual choice of residential location using the microeconomics of discrete choices. The individual is seen as deciding frequency, duration, and location of a set of activities for each potential residential zone, knowing the distribution of goods and activities in space as well as transport costs and travel times. The conditional indirect utility function and its associated willingness to pay function for each zone are obtained, where the roles of accessibility, income, and neighborhood attributes emerge clearly. Zonal utility in discrete location choice models can be specified and interpreted using these functions.

Notes: The effect of replacing fishmeal with soybean meal in the diet and also partial dietary protein replacement with carbohydrates, on sharpsnout sea bream (Diplodus puntazzo) total lipid fatty acid profile was studied. A group of sharpsnout sea bream of 200 g were fed a diet containing either 0%, 20%, 40% or 60% of protein from soybean meal. In a second experiment, fish (126 g) were fed diets with reduced protein and increased carbohydrate percentages. Fishmeal replacement with soybean meal increases the fish polyunsaturated fatty acids (PUFA) content, mainly due to linoleic acid, which is present in high quantities in soya. But as a consequence, the inclusion of soybean meal produces a significant decrease of the n-3/n-6 relationship (from 2.21±0.07 to 1.66±0.05). Replacement of protein with carbohydrate hardly modifies the diet fatty acid profile. As the fishmeal content decreases, there is a slight reduction of saturated fatty acids, the diet with lowest protein percentage having the highest monounsaturated fatty acids and lowest PUFA proportions. Fat quality indices are similar to those reported in previous studies, and in the case of fish under soy-containing diets, they are favourables. However, fishmeal replacement causes a loss of n-3 fatty acids that is important to compensate using other sources rich in this type of fatty acids.

Notes: Purpose - First, to theoretically justify and empirically test the sequence of effects based on the standard learning hierarchy to explain consumers' online buying-related responses. Second, to analyse the moderating role that consumers' internet expertise can play on the formation of both their affective and buying-related responses towards this medium. Design/methodology/approach - This study poses a conceptual model which is tested by means of LISREL. The data used come from a questionnaire applied to American and Spanish internet users. These two countries have been selected taking into account their differences regarding their degree of internet expertise. Findings - The modelling approach appears to be adequate to explain online consumer behaviour. Moreover, different levels of consumers' internet expertise determines, in general, the predominance of the central or the peripheral route within the formation of their affective and behavioural responses to this medium. Research limitations/implications - This study provides a relevant contribution to the field of consumer behaviour on the internet. It presents an extensive literature review; it introduces new concepts and new relations among them; it successfully adapts classic consumer theories, i.e. the CAB paradigm and the Elaboration Likelihood Model - to the electronic market context; and it has a cross-national vision. Practical implications - It shows how any virtual firm which endeavours to understand consumers' shopping behaviour in its web site should consider these general issues in conjunction with the rest of the specific factors and variables related to it. Originality/value - This is one of the first studies which, on the one hand, theoretically integrates in a model the following concepts: beliefs and attitude towards the internet, trust in internet shopping and online shopping, and on the other, demonstrates that the degree of internet expertise plays an essential role in determining how consumers process and form their affective and buying-related responses on the internet.

Notes: Abstract The core of the El Tormes thermal dome, situated in the central part of one of the main metamorphic belts of the Iberian Peninsula, is formed by garnet-cordierite-biotite-sillimanite pelitic gneisses. These rocks, that very often are cut by minor intrusions of Al-rich S-type granites, are metatexitic gneisses in which there exists garnet showing different stages of resorption and transformation into an aggregate of cordierite±plagioclase±biotite. The garnet, mantled and corroded mainly by cordierite, has never been found to occur in contact with the prismatic sillimanite of the matrix, thus indicating that the continuous reaction Gr+Sill+Q = Cd has taken place. The presence of corroded biotite inside the garnet-rimming cordierite of the aggregates as well as inside the cordierite of the matrix, which usually includes remmants of sillimanite, indicates that the continuous reaction Bi+Sill+Q = Cd+FK+H2O has occurred too. Therefore, a realistic net reaction for these aggretates should be represented by the univariant, at a given $$X_{{\text{H}}_{\text{2}} {\text{O}}} $$ , equilibrium: Biotite+Sillimanite+Garnet+Quartz = Cordierite+K-feldspar+H2O (1) The important garnet resorption near the anatectic granitic veins implies that this process is favoured by a decrease in $$X_{{\text{H}}_{\text{2}} {\text{O}}} $$ , this factor being otherwise buffered by the reaction (1) assemblage. The most probable P-T path, assuming these conditions, consistent with the AFM projection of the former (inferred) and present assemblages in the aggregates and in the matrix, implies a decrease in P coeval with a decrease in T (Fig. 4, path 2). The most reliable P-T determination for the final stage of garnet breakdown through reaction (1), based on the coexistence of the seven phase assemblage garnet — cordierite — biotite — sillimanite — plagioclase — potash feldspar — quartz plus melt, gives 695° C, 4.3 kbar, $$X_{{\text{H}}_{\text{2}} {\text{O}}} $$ = 0.5, The maximum pressure for this process, obtained from the garnet — plagioclase equilibrium, is 6.5±1 kbar at the same temperature. The estimates of the T for the garnet core-garnet included biotite pairs are consistently lower, ca. 550° C, than those obtained for the garnet rim-biotite in aggregates, ca. 645° C, or garnet rim-adjacent cordierite pairs, ca. 695° C. It may, therefore, be supposed that, during their evolution these rocks underwent first an increase in T and then, during the last stages, as garnet and biotite brokedown, a decrease in P and T. This represents an uplift of the core of El Tormes dome under high grade amphibolite to low pressure granulite facies conditions, accompanied by a process of partial melting with local decrase in $$X_{{\text{H}}_{\text{2}} {\text{O}}} $$ . It is suggested, from mineral growth-deformation relationships, that this process took place during the late hercynian deformation phases, P-3 or doming stage.