900 resultados para Aeronautics and state


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The present research examined whether in a test situation, the relation between trait test anxiety and state anxiety depends on the momentary availability of self-control strength. Since self-control strength is crucial for emotion regulation, we assume that trait test anxiety is more closely related to state anxiety if self-control strength is depleted than if it is not depleted. We conducted an experiment with 119 undergraduates in which we measured trait test anxiety, manipulated availability of self-control strength, and assessed state anxiety after a test announcement. Consistent with the assumption, multiple regression analyses revealed that trait test anxiety and state anxiety were positively related if self-control strength was depleted, but were not related if self-control strength was intact.

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This paper considers the aggregate performance of the banking industry, applying a modified and extended dynamic decomposition of bank return on equity. The aggregate performance of any industry depends on the underlying microeconomic dynamics within that industry . adjustments within banks, reallocations between banks, entry of new banks, and exit of existing banks. Bailey, Hulten, and Campbell (1992) and Haltiwanger (1997) develop dynamic decompositions of industry performance. We extend those analyses to derive an ideal decomposition that includes their decomposition as one component. We also extend the decomposition, consider geography, and implement decomposition on a state-by-state basis, linking that geographic decomposition back to the national level. We then consider how deregulation of geographic restrictions on bank activity affects the components of the state-level dynamic decomposition, controlling for competition and the state of the economy within each state and employing fixed- and random-effects estimation for a panel database across the fifty states and the District of Columbia from 1976 to 2000.

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This paper considers the aggregate performance of the banking industry, applying a modified and extended dynamic decomposition of bank return on equity. The aggregate performance of any industry depends on the underlying microeconomic dynamics within that industry --- adjustments within banks, reallocations between banks, entry of new banks, and exit of existing banks. Bailey, Hulten, and Campbell (1992) and Haltiwanger (1997) develop dynamic decompositions of industry performance. We extend those analyses to derive an ideal dynamic decomposition that includes their dynamic decomposition as one component. We also extend the decomposition, consider geography, and implement decomposition on a state-by-state basis, linking that geographic decomposition back to the national level. We then consider how deregulation of geographic restrictions on bank activity affects the components of the state-level dynamic decomposition, controlling for competition and the state of the economy within each state and employing fixed- and random-effects estimation for a panel database across the fifty states and the District of Columbia from 1976 to 2000.

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Church and state have historically had an uneasy relationship, sometimes close allies, at others harsh adversaries, and at still others largely independent of one another. This paper develops an economic model of this relationship, where the state's objective is to maximize net tax revenue, while the church provides religious goods. Religious goods benefit the state in two ways: first, they provide utility to citizens, thus allowing the state to extract more taxes before running up against citizens' reservation utility (the point at which they would revolt), and second, they potentially provide legitimacy to the state, thereby lowering the costs of tax collection. If the latter effect is strong enough, the state may find it optimal to take control of the church, either to enhance its legitimizing effect, or to suppress its de-legitimizing effect. To evaluate the model's implications, we use recent cross-country data on the relationship between religion and state, including measures coded from the 2001, 2003, and 2005 International Religious Freedom reports. We also examine in more detail some of the paradigmatic cases indicated by the model, presenting various types of evidence from current and historical examples of each case.

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The estimation of modal parameters of a structure from ambient measurements has attracted the attention of many researchers in the last years. The procedure is now well established and the use of state space models, stochastic system identification methods and stabilization diagrams allows to identify the modes of the structure. In this paper the contribution of each identified mode to the measured vibration is discussed. This modal contribution is computed using the Kalman filter and it is an indicator of the importance of the modes. Also the variation of the modal contribution with the order of the model is studied. This analysis suggests selecting the order for the state space model as the order that includes the modes with higher contribution. The order obtained using this method is compared to those obtained using other well known methods, like Akaike criteria for time series or the singular values of the weighted projection matrix in the Stochastic Subspace Identification method. Finally, both simulated and measured vibration data are used to show the practicability of the derived technique. Finally, it is important to remark that the method can be used with any identification method working in the state space model.

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North African steppes are subjected to extreme degradation resulting in the reduction of their surface, genetic erosion of resources, and decrease in biodiversity. "Stipa tenacissima" steppes, which constitute one of the most representative vegetation types in the driest areas of the Mediterranean basin, are continuously degrading. With the aim of contributing to a better knowledge of the floristic composition and diagnosing the state of degradation of these steppes, we conducted a phytoecological analysis of 10 "S. tenacissima" sites in Tunisia. Floristic inventory compiled a systematic list of 46 vascular plant species belonging to 43 genera and 26 families. Species richness ranged from 4 to 18 species per 900 m2. Total vegetation cover was moderate and fluctuated between 22.8% and 49.9%. Our results revealed also a decreasing trend in species richness with increasing elevation (ρ = –0.585). Indeed, species richness was negatively correlated with slope (ρ = –0.19) and positively correlated with sand content (ρ = 0.262). Biological types were dominated by chamaephytes; this chamaephytization is due to the phenomenon of aridization and overgrazing. Moreover, the low species cover and the appearance of nonpalatable species highlighted the vulnerability of these steppes to degradation.

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This dissertation engages the question of why German political elites accepted the use of force during the 1990s and started to commit the country's armed forces to multilateral peacekeeping missions. Previous governments of the Federal Republic had opposed foreign deployment of the military and Germany was characterized by a unique strategic culture in which the efficacy of military force was widely regarded as negative. The rediscovery of the use of force constituted a significant reorientation of German security policy with potentially profound implications for international relations. I use social role theory to explain Germany's security policy reorientation. I argue that political elites shared a national role conception of their country as a dependable and reliable ally. Role expectations of the international security environment changed as a result of a general shift to multilateral intervention as means to address emerging security problems after the Cold War. Germany's resistance to the use of force was viewed as inappropriate conduct for a power possessing the economic and military wherewithal of the Federal Republic. Elites from allied countries exerted social pressure to have Germany contribute commensurate with capabilities. German political elites adapted role behavior in response to external expectations in an effort to preserve the national role conception of a dependable and reliable ally. Security policy reorientation to maintain Germany's national role conception was pursued by conservative elites who acted as 'role entrepreneurs'. CDU/CSU politicians initiated a process of role adaptation to include the use of force for non-defensive missions. They persuaded Social Democrats and Alliance 90/Green party politicians that the maintenance of the country's role conception necessitated a reorientation in security policy to accommodate the changes in the security environment.

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Subsistence in Alaska is currently being impacted by naturally occurring factors such as global warming, species migration shifts, and the declination of fishery and wildlife populations. Not only are external factors pressuring the debate, management strategies from the dual management operation appear to have failed. The current national focus has been centered on federal policy changes regarding subsistence. This project extends the federal subsistence review process into the state management of subsistence and provides practical solutions for enhancing both policy programs.

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This report explores the concept of state (un)sustainability in Israel and Palestine. The starting point sees conflict resolution as an independent variable for any change and progress in the area, in terms of a political, just and credible agreement between the two parties, which will then play a decisive role in the development of the Mediterranean region. These developments and prospects for a solution are then evaluated on the basis of state (un)sustainability, a broad notion that refers to the possibilities for long-term development at the political, social and economic levels. The very nature of Israel’s democracy and its relations with its Arab minority, the challenges related to the establishment of a viable and sustainable Palestinian state, and the regional dimension of all the actors involved are considered in order to evaluate future scenarios in this context. Three scenarios are tested: sustainability, which corresponds to the end of the conflict and the establishment of two viable and independent states with a tangible improvement in political and economic indicators; unsustainability, which refers to the perpetuation of the political status quo and the progressive deterioration of all political, economic and social indicators; and finally, weak stability, which entails the achievement of a sterile political stability, able to sustain the present status quo but unable to confront the main challenges for the future of the country(ies).

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This paper looks at the difference between the levels and nature of social policy expenditure in northern and northwest European countries and the countries of southern, central, and eastern Europe, and examines the relationship between social investment and state capacity in these country groupings. The authors show that southern and eastern countries have a much greater preference for ‘compensating’ rather than ‘capacitating’ social policy spending. Furthermore, the state capacity in these countries is lower, which generates less state revenue. Based on these observations they conclude that low state capacity and low state revenue go hand in hand with the preference for capacitating social policies, as these policies involve less delegation and discretion than social investment policies. This paper shows that high state capacity is probably a necessary precondition for effective social investment policies, although some limited alternative paths do exist.