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In this letter, we demonstrate the formation of unique Ga/GaAs/Si nanowire heterostructures, which were successfully implemented in nanoscale light-emitting devices with visible room temperature electroluminescence. Based on our recent approach for the integration of InAs/Si heterostructures into Si nanowires by ion implantation and flash lamp annealing, we developed a routine that has proven to b

The structural and electronic properties of nonstoichiometric low-temperature grown GaAs nanowire shells have been investigated with scanning tunneling microscopy and spectroscopy, pump-probe reflectivity, and cathodoluminescence measurements. The growth of nonstoichiometric GaAs shells is achieved through the formation of As antisite defects, and to a lower extent, after annealing, As precipitate

GaAs nanowire arrays on silicon offer great perspectives in the optoelectronics and solar cell industry. To fulfill this potential, gold-free growth in predetermined positions should be achieved. Ga-assisted growth of GaAs nanowires in the form of array has been shown to be challenging and difficult to reproduce. In this work, we provide some of the key elements for obtaining a high yield of GaAs

It is widely believed that, in contrast to its electron-doped counterparts, the hole-doped compound Ba(1-x)K(x)Fe(2)As(2) exhibits a mesoscopic phase separation of magnetism and superconductivity in the underdoped region of the phase diagram. Here, we report a combined high-resolution x-ray powder diffraction and volume-sensitive muon spin rotation study of Ba(1-x)K(x)Fe(2)As(2) showing that this

Membrane filtration technique shows exclusively properties for optimized filtration for a given size, from micrometer to nanometer scales compared to other industrial filtration. However, there is a trade off in flux that has delayed the implementation of the membrane techniques for a wider range of applications. For a specific flow in a process stream, the limited flux through the membrane means

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Test beam measurements at the test beam facilities of DESY have been conducted to characterise the performance of the EUDET-type beam telescopes originally developed within the EUDET project. The beam telescopes are equipped with six sensor planes using MIMOSA 26 monolithic active pixel devices. A programmable Trigger Logic Unit provides trigger logic and time stamp information on particle passage

In pharmaceutical biotechnology, ultrafiltration with diafiltration for recovery of fermentation products on an industrial scale is now the state-of-the-art technology. To optimise this process, DSS has developed two new concepts: (1) an optimised control system for constant permeate concentration even at varying feed streams and (2) continuous counter-current diafiltration to significantly reduce

The membrane market for the food and beverage industry of which the wine market has a significant share developed to the second largest market after municipal water treatment in Europe. The trend in the wine market towards larger volumes combined with an improved quality leads to a constant investment for upgrading and updating present product facilities. There are several interesting positions of

The formation age of the large (∼50 km) Carswell impact structure, Canada, has been a matter of debate ever since its discovery five decades ago, with proposed ages ranging from Mesoproterozoic to Early Cretaceous. Here, we present new 40Ar-39Ar data for aliquots of euhedral adularia, separated from vesicles in an impact melt rock from the central uplift of the structure. The analyses of the adula

Potential applications of membrane technology for the beverage industry will be presented by two case studies. The focus of the first case study is on the clarification and concentration of fruit juice. A novel combination of a centrifuge with ultrafiltration for the clarification will be discussed together with the combination of an evaporator combined with reverse osmosis for the concentration.

Objective—To determine medium-term outcome after arterial switch operation for complete transposition in a population-based cohort.Design—Retrospective study of all 86 patients operated on at our institution from 1982 to 2000. Age at operation was 0-256 days (median 6 days); 28 (32%) had closure of a ventricular septal defect, 2 of whom had double outlet right ventricle. Additional surgery include

UV (240-370 nm) and IR (3200-1500 cm-1) absorption cross-sections of HCHO, HCDO, and DCDO in abath gas of N2 at atmospheric pressure and 296 K are reported from simultaneous measurements in the twospectral regions. Cross-sections were placed on an absolute scale through quantitative conversion offormaldehyde to CO and HCOOH by titration with Br atoms, also monitored by FTIR. The integrated UVabsor

The photolysis rates of HCHO, DCDO, CH3CHO, and CH 3CDO are studied by long-path FTIR spectroscopy in natural tropospheric conditions at the European Photoreactor Facility (EUPHORE) in Valencia, Spain. Average relative photolysis rates jHCHO/j DCDO = 3.15 ± 0.08 and jCH3CHO/jCH3CDO = 1.26 ± 0.03 are obtained from three days of experiments for each reaction in the period June 17 to July 7, 2006.