11 Result(s)
within
Article
Klaus Köhler
English
-
Article
Effects of the realignment on LDCs
The Washinton Realignment aims at adjusting the distortions of exchange rates which have arisen during the past years. In doing so, new data have been set for the future. These data have been fixed by the indu...
-
Article
Controlled Distribution of Solid Catalysts into Two Immiscible Liquid Phases – Synthesis and Catalytic Applications
A new concept for the separation of heterogeneous catalysts is presented. Against gravity, surface modified catalysts are located only in one of two immiscible liquid phases. The catalyst phase can be separate...
-
Article
Coordination of solvent molecules to VO(acac)2 complexes in solution studied by hyperfine sublevel correlation spectroscopy and pulsed electron nuclear double resonance
Interactions and binding sites of the solvent molecules chloroform and ethanol to bis(acetylacetonate)oxovanadium(IV) (VO(acac)2) complexes in (frozen) solutions have been investigated by pulsed electron nuclear ...
-
Article
Heck Reactions of Aryl Chlorides Catalyzed by Ligand Free Palladium Salts
Palladium acetate has been shown to be a highly active catalyst for Heck reactions of aryl chlorides even in the absence of organic ligands. Bromobenzene can efficiently be coupled in presence of negligible tr...
-
Article
SIMS depth profiling of Mg back-diffusion in (AlGaIn)N light-emitting diodes
The Mg do** profiles in close proximity to the (AlGaIn)N/GaN QW active region of group III-nitride light-emitting diodes grown by low pressure metal-organic vapor-phase epitaxy on sapphire substrates were in...
-
Article
Abatement of NO Using Rhodium Catalysts Supported on Carbon Nanotubes: Carbon as Support Material and Reducing Agent
The catalytic abatement of NO over rhodium catalysts supported on carbon nanotubes was studied. In the absence of oxygen, Rh/carbon nanotubes (CNT) catalysts exhibit high activities in the catalytic reduction ...
-
Article
Increased Conversion in the Heck Reaction Under Irradiation with Light
Irradiation with light (UV–vis and visible) was shown to increase the rate of the Heck reaction at 90–140 °C using both heterogeneous and homogeneous catalysts. The photoreduction of Pd(II) is most likely the ...
-
Article
Implantation Studies on Silicon-Doped GaN
Silicon-doped GaN layers grown by low-pressure metalorganic vapor-phase epitaxy with Si concentrations ranging from 2 × 1017 Si/cm3 to 9.2 × 1018 Si/cm3 were investigated by means of the perturbed angular correla...
-
Article
Aluminum–germanium wafer bonding of (AlGaIn)N thin-film light-emitting diodes
Eutectic aluminum–germanium wafer bonding was used to fabricate (AlGaIn)N thin-film light-emitting diodes (LEDs). Wafer bonding was carried out on 2″ wafer level at a bond temperature of 470 °C using patterned...
-
Article
Open AccessDark chocolate and reduced snack consumption in mildly hypertensive adults: an intervention study
Several studies have shown that cocoa and cocoa-containing foods have the potential to lower blood pressure and improve endothelial function. Most of the studies reporting the beneficial effects of dark chocol...
-
Article
Catalytic Properties of a Novel Raney-Nickel Foam in the Hydrogenation of Benzene
The catalytic properties of a novel Raney-Nickel mold were investigated in the liquid-phase hydrogenation of benzene and compared to commercially available Raney-Nickel. The novel Raney-Nickel catalyst showed ...
