10,574 research outputs found
Design and fabrication of a data logger for atmospheric pressure, temperature and relative humidity for gas-filled detector development
A novel instrument has been developed to monitor and record the ambient pa-
rameters such as temperature, atmospheric pressure and relative humidity. These
parameters are very essential for understanding the characteristics such as
gain of gas filled detectors like Gas Electron Multiplier (GEM) and Multi Wire
Propor- tional Counter (MWPC). In this article the details of the design,
fabrication and operation processes of the device has been presented.Comment: 11 pages, 12 figure
Effects of edge magnetism and external electric field on energy gaps in multilayer graphene nanoribbons
Using first-principles density-functional theory, we study the electronic
structure of multilayer graphene nanoribbons as a function of the ribbon width
and the external electric field, applied perpendicular to the ribbon layers. We
consider two types of edges (armchair and zigzag), each with two edge
alignments (referred to as alpha- and beta-alignments). We show that, as in
monolayer and bilayer armchair nanoribbons, multilayer armchair nanoribbons
exhibit three classes of energy gaps which decrease with increasing width.
Nonmagnetic multilayer zigzag nanoribbons have band structures that are
sensitive to the edge alignments and the number of layers, indicating different
magnetic properties and resulting energy gaps. We find that energy gaps can be
induced in ABC-stacked ribbons with a perpendicular external electric field
while in other stacking sequences, the gaps decrease or remain closed as the
external electric field increases.Comment: 7 pages, 9 figures, text revised, last version before publicatio
Efficient intracavity frequency doubling of an Yb-doped fiber laser using an internal resonant enhancement cavity
We describe a simple approach for efficient generation of visible light in high-power continuous-wave fiber lasers via second harmonic generation in an internal resonant cavity. Preliminary results for a cladding-pumped Yb fiber laser are presented
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