On the Chow rings of classifying spaces for classical groups

We show how the stratification method, introduced by Vezzosi in his study of PGL_3, provides a unified approach to the known computations of the Chow rings of the classifying spaces of GL_n, SL_n, Sp_n, O_n and SO_n.Comment: 24 page

Commuting Time and Labour Supply: A Causal Effect?

We analyze the causal effect of the length of the worker’s commute on worker's productivity, by examining whether commuting time has any effect on worker's labour market supply. Using the Spanish Time Use Survey 2002-03, our GMM/IV estimation yields a positive causal impact of commuting time on the time devoted to the labour market, with one hour of commuting increasing the time devoted to the labour market by 35 minutes in a working day. Our results shed light on the relationship between commuting and workers behaviour, since daily labour supply should be considered in theoretical models to provide a comprehensive view of commuter behaviour.commuting, labour supply, productivity, causality, Time Use Survey

The Motherhood Wage Penalty in a Mediterranean Country: The Case of Spain

We present evidence for the motherhood wage penalty in Spain as a representative Southern European Mediterranean country. We use the European Community Household Panel (ECHP, 1994-2001) to estimate, from both pool and fixed-effects methods, a wage equation in terms of observed variables and other non-observed individual characteristics. The empirical results confirm that there is clear evidence of a wage penalty for Spanish working women with children. Specifically, the fact that there is a birth in the family during the current year means that the woman loses 9% of her wage. We also find that having one child living in the household means a significant loss in wages of 6%, having two children, almost 14%, and having three or more, more than 15%.motherhood wage penalty, fixed-effects estimation, Spain

Dynamics of Intrahousehold Bargaining

This paper studies the dynamics of bargaining in an intrahousehold context. To explore long-term partner relationships, we analyse bilateral bargaining by considering that spouses take decisions sequentially. We conclude that a greater valuation of the present, rather than the future, for the spouse who takes the second decision, increases the set of possible sustainable agreements, as well as the proportion of time that this agent devotes to a family good.Stackelberg game, family bargaining, family good

The Michelson system

Treballs Finals de Grau de Matemàtiques, Facultat de Matemàtiques, Universitat de Barcelona, Any: 2016, Director: Àlex HaroThe Michelson system is a three dimension autonomous ODE system that arises in the context of studying the travelling waves solutions of the Kuramoto-Sivashinsky equation. Nonetheless, this system has its own relevance in itself, as it possesses some rich dynamics. In particular, the Michelson system is an interesting system to study since it is non-Hamiltonian, volume preserving and has a time reversing symmetry. In this work we will study the main properties of the system from a theoretical and a numerical point of view. More precisely, in the theoretical part we introduce the properties mentioned above and study the equilibrium points stability and their invariant manifolds. Moreover, some results on the existence of some type of orbits are also given. For the numerical part, we implement an algorithm to integrate orbits and give detailed methods to find periodic orbits. However, the main result of this block is the implementation of an algorithm to find the heteroclinic orbits of the Michelson system

Sistemas financieros y financiación de las PYMES en España y Europa

Tras la excesiva dependencia del crédito bancario vivida históricamente en Europa los sistemas financieros evolucionan hacia una orientación de mercado y un mayor equilibrio entre la financiación bancaria y no bancaria, todo ello impulsado por la puesta en marcha de mercados alternativos de renta variable y de renta fija de mayor accesibilidad para empresas de menor tamaño. Además, distintas fuentes de financiación tradicionales vuelven a retomar impulso tras la crisis financiera de 2008, al tiempo que otros métodos alternativos de financiación se posicionan como necesarios para la obtención de recursos por parte de pequeños negocios.Following the over-reliance on bank credit historically experienced in Europe, financial systems have evolved towards market orientation and a better balance between bank and non-bank financing, all driven by the launch of alternative equity and fixed income markets of greater accessibility for smaller companies. In addition, a number of traditional sources of funding are regaining momentum following the financial crisis of 2008, while other alternative financing methods are positioned as necessary to obtain resources from small businesses.Universidad de Sevilla. Grado en Administración y Dirección de Empresa

Intra-household Time Allocation: Gender Differences in Caring for Children

Der vorliegende Beitrag untersucht auf Basis von Daten des Sozio-oekonomischen Panels für Deutschland (SOEP), inwieweit selbständige Ausländer in Deutschland überdurchschnittlich hohe Einkommen erzielen. Die Untersuchung zeigt, dass ausländische Selbständige insgesamt höhere Einkommen erzielen als angestellt tätige Ausländer und dass der Unterschied größer ist als bei Selbständigen deutscher Nationalität. Die Konsequenzen dieser Untersuchungsergebnisse für Wirtschaftspolitikund Gründungslehre werden diskutiert. Die Ergebnisse der Untersuchung zeigen differenzierten Forschungsbedarf im Hinblick auf unterschiedliche Optionen der Entrepreneurship Education. This paper analyses the intra-household allocation of time to show gender differences in childcare. In the framework of a general efficiency approach, hours spent on childcare by each parent are regressed against individual and household characteristics, for five samples (Denmark, France, Germany, Italy and Spain), with data being drawn from the European Community Household Panel-ECHP (1994-2001). Empirical results show a clear inequality in childcare between fathers and mothers, with this being more evident in Mediterranean countries. Panel data estimates reveal that, in general, caring tasks are mainly influenced by the presence of young children in the household, by the total non-labor income, and by the ratio of mothers' non-labor income to family's non-labor income, with this latter variable exhibiting a different behavior across genders and across countries.Childcare, gender differences, intra-household allocation, time use

The stability of intergenerational cooperation in altruistic families

This paper analyses the stability of bargaining solutions in a family consisting of two parents and one adult child, by developing a non-cooperative family game. Assuming different bargaining powers between parents and the child, we find that the greater bargaining power of the parents allows them to take greater gains from the cooperation, and reduce the incentives to deviate from the cooperative agreement. The presence of altruism between the players will significantly reduce the probability that there will be incentives to break the cooperative agreement. A higher level of altruism increases the stability of cooperation, and will overcome the contrary effect of other factors.

Reusable Launch Vehicle Design Implications for Regeneration Time

In last few years, the Air Force Research Laboratory sponsored several research projects on a Reusable Launch Vehicles (RLV) whose design, operation, and logistics requirements are intended to be much simpler than for the Space Shuttle. As a part of these efforts, previous researchers developed a model that simulated the post-landing, ground maintenance and prelaunch operations of a RLV in order to evaluate how its design parameters affect the logistics operations. The next logical step is to investigate the effects and interactions of all factors used in the existing simulation model in a single experiment that considers the huge number of possible design characteristics’ combinations discovered in the previous studies as well as varying resources such as manpower, ground support equipment and facilities. The goal of this research is to recommend to the AFRL a preferred design strategy that could minimize the resource requirements in terms of equipment and manpower as well as turnaround time of logistics operations. In order to achieve this goal, this study identifies significant effects of the RLV\u27s design characteristics by utilizing the AFRL’s MILEPOST discrete-event simulation model in a systematic design of experiment (DOE) approach. In addition, it assesses the impact of varying resources (manpower, ground support equipment and fleet size) on departure availability. The results of this research is intended to provide the AFRL with valuable and timely information about the combinations of selected RLV design characteristics which could assist in directing efforts in research and development of the future space vehicle