Bulletin de l'Association générale des mutilés de la guerre

1949/08 (A34,N269)-1949/12.

Bulletin de l'Association générale des mutilés de la guerre

1949/05 (A34,N268)-1949/07.

Bulletin de l'Association générale des mutilés de la guerre

1947/03 (A32,N259)-1947/04.

Bulletin de l'Association générale des mutilés de la guerre

1948/04 (A32,N264)-1948/06.

Bulletin de l'Association générale des mutilés de la guerre

1947/05 (A32,N260)-1947/06.

Bulletin de l'Association générale des mutilés de la guerre

1949/03 (A34,N267)-1949/04.

Bulletin de l'Association générale des mutilés de la guerre

1948/07 (A32,N265)-1948/12.

Bulletin de l'Association générale des mutilés de la guerre

1940/03 (A25,N260)-1940/04.

Bulletin de l'Association générale des mutilés de la guerre

1940/01 (A25,N259)-1940/02.

Bulletin de l'Association générale des mutilés de la guerre

1947/10 (A32,N262)-1947/12.

Bulletin de l'Association générale des mutilés de la guerre

1947/07 (A32,N261)-1947/09.

Bulletin de l'Association générale des mutilés de la guerre

1947/01 (A32,N258).

Bulletin de l'Association générale des mutilés de la guerre

1949/01 (A34,N266)-1949/02.

Coolant Flow and Heat Transfer in Pebble-Bed Reactor Core

This thesis gathers knowledge about ongoing high-temperature reactor projects around the world. Methods for calculating coolant flow and heat transfer inside a pebble-bed reactor core are also developed. The thesis begins with the introduction of high-temperature reactors including the current state of the technology. Process heat applications that could use the heat from a high-temperature reactor are also introduced. A suitable reactor design with data available in literature is selected for the calculation part of the thesis. Commercial computational fluid dynamics software Fluent is used for the calculations. The pebble-bed is approximated as a packed-bed, which causes sink terms to the momentum equations of the gas flowing through it. A position dependent value is used for the packing fraction. Two different models are used to calculate heat transfer. First a local thermal equilibrium is assumed between the gas and solid phases and a single energy equation is used. In the second approach, separate energy equations are used for the phases. Information about steady state flow behavior, pressure loss, and temperature distribution in the core is obtained as results of the calculations. The effect of inlet mass flow rate to pressure loss is also investigated. Data found in literature and the results correspond each other quite well, considered the amount of simplifications in the calculations. The models developed in this thesis can be used to solve coolant flow and heat transfer in a pebble-bed reactor, although additional development and model validation is needed for better accuracy and reliability.

Generalized three-sided assignment markets: consistency and the core

A class of three-sided markets (and games) is considered, where value is generated by pairs or triplets of agents belonging to different sectors, as well as by individuals. For these markets we analyze the situation that arises when some agents leave the market with some payoff To this end, we introduce the derived market (and game) and relate it to the Davis and Maschler (1965) reduced game. Consistency with respect to the derived market, together with singleness best and individual anti-monotonicity axiomatically characterize the core for these generalized three-sided assignment markets. These markets may have an empty core, but we define a balanced subclass, where the worth of each triplet is defined as the addition of the worths of the pairs it contains. Keywords: Multi-sided assignment market, Consistency, Core, Nucleolus. JEL Classification: C71, C78