An experimental test system including the oil circulation system and the gas circuit system has been designed and built to explore the effects of the lubricating oil flow rate on the performance of a single-screw compressor, used in a portable natural gas liquefaction process. Outlet pressure, outlet volumetric flow rate, volumetric efficiency, and specific power rate are the parameters for evalua

This paper summarizes the state-of-the-art of the lattice matched GaInP/Ga(In)As/Ge triple-junction solar cell developed at the Solar Energy Institute of UPM (IES-UPM). Different research topics tackled over the last years about this structure are described. As result of this work, an efficiency of ∼ 40% at ∼ 415 × is presented.

We present a low-temperature electrical transport study on four-terminal ballistic InAs nanowire cross-junctions in magnetic fields aligned perpendicular to the cross-plane. Two-terminal longitudinal conductance measurements between opposing contact terminals reveal typical 1D conductance quantization at zero magnetic field. As the magnetic field is applied, the 1D bands evolve into hybrid magneto

This article deals with an essential problem in the metal cutting industry, the problem of predicting tool wear and tool life. This is also a problem that has been studied by academia for the last century, often with very little added knowledge. The possibility to replace a large number of systematic wear tests with only a few specially designed tests provides new potentials for rapid information

Natural products are compounds that exist naturally in living organisms, e.g.,plants, animal and fungi. These compounds are likely biologically active and canbe used as pharmaceuticals for various diseases. Evolution has made it possible forliving organisms to produce these natural products as a defence mechanism againstvarious threats. In most cases, the organism only produces a small amount of tThis thesis describes our efforts towards the total synthesis of natural products and the development of a newmethodology to afford a synthetically important scaffold.Chapter 2 outlines our efforts towards the total synthesis of a marine natural product, perophoramidine as wellas our completed synthesis of dehaloperophoramidine. The focus of the studies was to develop an efficient andconcise strat

GaN nanowires (NWs) are promising building blocks for future optoelectronic devices and nanoelectronics. They exhibit stronger piezoelectric properties than bulk GaN. This phenomena may be crucial for applications of NWs and makes their study highly important. We report on an investigation of the structure evolution of a single GaN NW under an applied voltage bias along polar [0001] crystallograph

The production of η′ mesons in coincidence with forward-going protons has been studied in photon-induced reactions on 12 C and on a liquid hydrogen (LH 2 ) target for incoming photon energies of 1.3–2.6 GeV at the electron accelerator ELSA. The η′ mesons have been identified via the η′ → π 0 π 0 η → 6γ decay registered with the CBELSA/TAPS detector system. Coincident protons have been identif