Context. NGC 6791 is a well-studied, metal-rich open cluster that is so close to us that it can be imaged down to luminosities fainter than that of the termination of its white-dwarf cooling sequence, thus allowing for an in-depth study of its white dwarf population. Aims. White dwarfs carry important information about the history of the cluster. We use observations of the white-dwarf cooling s...

INTRODUCTION The Tokai Power Station (Tokai 1), a 166MWe gas-cooled graphite-moderated reactor of advanced Calder-Hall type, ceased commercial operation in March 1998 after 32 years of service, and spent fuels are being discharged from the core at present for preparation of decommissioning the reactor. Plans for the decommissioning that include future dismantling work, have been studied since t...

Member of the Graduiertenkolleg (DFG GK-GRK 410/1) In the new GSI project stochastic cooling of secondary particles will be used. The efficiency of stochastic cooling is mainly influenced by the coupling of the electrodes to the beam. This performance has to be investigated and optimised. The investigation is done via a three dimensional numerical electromagnetic field analysis with use of the ...

The present paper describes the designing of a thermally and economically optimum mechanical draft counter-flow wet cooling tower. The design model allows the use of a variety of packing materials in the cooling tower toward optimizing heat transfer. Once the optimum packing type is chosen, a compact cooling tower with low fan power consumption is modelled within the known design variables....

This paper presents the online optimal control strategies of the central chilling system in a super high-rise building in Hong Kong. The work presented aims at developing a package of optimal control strategies and evaluating their energy saving potentials and finally implementing these strategies in the building to enhance its energy efficiency. Based on testing the effects of interactions wit...

The number of aging nuclear power plants (NPPs) has increased recently. Accordingly, the number of operational interruptions has increased due to malfunctions of the NPPs secondary systems. These cases occur in the secondary systems of NPPs with a range of structures due to fatigue, wall-thinned defects, corrosion, etc. Of these problems, wall thinned defects occur in the pipes by the diffusion...

Improvements in the efficiency of gas turbine engines over decades have led to increasing inlet temperatures. This, turn, has resulted need cool blades themselves avoid damage them. While air-cooling and film-cooling methods been adopted as primary blade cooling, heat pipe cooling method shows greater potential terms temperature uniformity, maximum allowable temperature, reliability, durability...

In a polymer membrane fuel cell more than half of the chemical energy of hydrogen is converted to heat during generation of electricity. This causes an increase in the cell temperature. The Cooling field design has a significant role in cell cooling. The cell's performance and stability are reduced due to inappropriate heat dissipation. In this paper, the cooling flow and heat transfer in cooli...