Pressure probe compensates for dimensional tolerance variations

Flexible, compressible spring-loaded pressure probe measures the static pressure between the rotor stages on an axial-flow fuel pump. This probe is used in installation where a drilled static pressure tap or a rigid impulse tube cannot be used. Its parameters must be specially determined for each installation

Decentrilazation as ability to adapt

No abstract availableEconomics ;

The surprising place of cognitive psychology in the work of F.A. Hayek

In 1920, when Hayek was a student, he wrote a manuscript on cognitive psychology, which was published in 1952 as The Sensory Order. From the 1920s to the early 1940s Hayek developed his business cycle theory. The perceptions of economic agents play a central part in this theory. Contrary to what one might expect, however, none of the mental mechanisms of his earlier theory on perception and cognition play a part in his economics. The answer to this apparent anomaly lies in the programmatic character of the whole of Hayek''s work, and in the specific way in which his ideas evolved. His psychology played a prominent role in the later development of his ideas. If Hayek''s psychology influenced his early economics, it did so indirectly, by shaping his methodology. However, there may also be a common influence underlying both Hayek''s psychology and his economic methodology.Economics ;

Is the past really what is used to be ?

No abstract availableEconomics ;

ANALYZING NEGOTIATION APPROACHES IN NATURAL RESOURCE MANAGEMENT - A CASE STUDY OF CROP-LIVESTOCK CONFLICTS IN SRI LANKA

Participatory approaches in natural resource management are increasingly being criticized for their tendency to neglect power relations and conflicts of interests. Negotiation approaches have been proposed as a strategy to overcome such shortcomings. Using the case of negotiations on crop-livestock conflicts in Sri Lanka as an empirical example, this paper proposes to apply the concept of political capital in combination with game theoretical modeling for an analysis of negotiation processes in natural resource management. The model serves to analyze both the incentive structure of the resource users, who are motivated by economic incentives, and the incentive structure of political decision-makers, who are motivated by political interests. The crucial role that the public administration may play for the enforcement of a negotiation outcome is highlighted. The paper discusses potential extensions of the model and concludes that the concept of political capital, in combination with game theoretical modeling, provides a useful tool for the analysis of negotiation approaches in natural resource management.natural resource management, negotiation, political capital, extensive form game, Sri Lanka, Resource /Energy Economics and Policy, Q2,

Improving governance to eradicate hunger and poverty:

Poverty reduction, Hunger, Governance, food security, Political economy, Policy implications,

Choosing policy instruments to reduce poverty and hunger : Is it possible to overcome the feasibility dilemma?

Poverty reduction, Hunger, Public investments, infrastructure, Feasibility challenges,

Residual circulation trajectories and transit times into the extratropical lowermost stratosphere

Transport into the extratropical lowermost stratosphere (LMS) can be divided into a slow part (time-scale of several months to years) associated with the global-scale stratospheric residual circulation and a fast part (time-scale of days to a few months) associated with (mostly quasi-horizontal) mixing (i.e. two-way irreversible transport, including stratosphere-troposphere exchange). The stratospheric residual circulation can be considered to consist of two branches: a deep branch more strongly associated with planetary waves breaking in the middle to upper stratosphere, and a shallow branch more strongly associated with synoptic-scale waves breaking in the subtropical lower stratosphere. In this study the contribution due to the stratospheric residual circulation alone to transport into the LMS is quantified using residual circulation trajectories, i.e. trajectories driven by the (time-dependent) residual mean meridional and vertical velocities. This contribution represents the advective part of the overall transport into the LMS and can be viewed as providing a background onto which the effect of mixing has to be added. Residual mean velocities are obtained from a comprehensive chemistry-climate model as well as from reanalysis data. Transit times of air traveling from the tropical tropopause to the LMS along the residual circulation streamfunction are evaluated and compared to recent mean age of air estimates. A clear time-scale separation with much smaller transit times into the mid-latitudinal LMS than into polar LMS is found that is indicative of a clear separation of the shallow from the deep branch of the residual circulation. This separation between the shallow and the deep circulation branch is further manifested in a clear distinction in the aspect ratio of the vertical to meridional extent of the trajectories as well as the integrated mass flux along the residual circulation trajectories. The residual transit time distribution reproduces qualitatively the observed seasonal cycle of youngest air in the extratropical LMS in fall and oldest air in spring