Suchergebnisse

Im Rahmen der von der Bundesregierung beschlossenen Breitbandstrategie wird das Ziel verfolgt, dass bis 2014 mindestens 75 Prozent der Haushalte über Breitbandanschlüsse mit Übertra-gungsraten von mindestens 50 Mbit/s verfügen. Dieses Vorhaben kann nur durch eine Verkürzung der kup-ferbasierten Übertragungswege hin zu einem rein optischen Anschlussnetz gelingen. Der Beitrag zeigt, welchen wichtigen Beitrag die DSL-Technologie und deren Weiterentwicklung für den Ausbau der letzten Meile hin zu einem volloptischen Anschlussnetz liefern kann. Es wird begründet, warum in einigen Bereichen auch zukünftig die DSL-Technologie fortbestehen wird. Gleichzeitig werden Verfahren be-schrieben, die in den letzten Jahren an der Fraunhofer ESK erforscht wurden und die Performance der Kup-ferdoppelader unter gleichzeitiger Kosteneinsparung für die Netzbetreiber verbessern.

Made famous during the Vietnam War as underground passages of the Viet Cong guerillas, the Cu Chi Tunnels historical site is a tourist attraction, commonly associated with a kind of low-brow entertainment aimed at foreign visitors. This article expands the scholarship of this site using auto-ethnographic and qualitative survey research methods. Aimed at agitating Cu Chi's kitsch and political associations, the author considers the Vietnamese market economy and the reversed-migration flows, in order to contextualize Cu Chi as an identity-negotiation nexus for transmigrant Vietnamese professionals. Particular focus is placed on how visitation to Cu Chi tunnels and the abstention of visitation can allude to the participant's heritage affiliations.

Made famous during the Vietnam War as underground passages of the Viet Cong guerillas, the Cu Chi Tunnels historical site is a tourist attraction, commonly associated with a kind of low-brow entertainment aimed at foreign visitors. This article expands the scholarship of this site using auto-ethnographic and qualitative survey research methods. Aimed at agitating Cu Chi's kitsch and political associations, the author considers the Vietnamese market economy and the reversed-migration flows, in order to contextualize Cu Chi as an identity-negotiation nexus for transmigrant Vietnamese professionals. Particular focus is placed on how visitation to Cu Chi tunnels and the abstention of visitation can allude to the participant's heritage affiliations.

5wt% copper doped zinc oxide (Cu-ZnO) nanostructures were prepared via the hydrothermal technique at different temperatures of 70, 100, 130, 160 and 190oC. UV spectroscopy, FE-SEM microscopy, XRD crystallography, and EDS measurements were used for nanostructure characterization. UV spectroscopy indicated a red shift for the absorption peaks, and hence a blue shift for the energy gap values, as temperature increased from 70 to 190oC. FE-SEM microscopy showed an increase in the average lengths and diameters of the nanostructures following a similar increase in temperature. XRD crystallography indicated decent structural patterns for Cu-ZnO nanostructures with an increase in crystallite size upon temperature increase. Interestingly, three unprecedented extra indices appeared in the structural pattern at 190oC, which might indicate a configuration of hexagonal crystallite with three extra planes. EDS measurements indicated the sole presence of Cu, Zn and O.