3,933 research outputs found
Effects of chicory roots on finishing performance and CLA and fatty acid composition in longissimus muscle of Friesian steers
Low profitability is believed to be the greatest hindrance profitability is believed to be the greatest hindrance for a more extensive use of dairy breed bull calves in for a more extensive use of dairy breed bull calves in organic beef production systems organic beef production systems Among certain consumers, there is an increasing interest Among certain consumers, there is an increasing interest for organic beef production for organic beef production However, there is a need for reliable information about However, there is a need for reliable information about and documentation for production parameters, methods and documentation for production parameters, methods for rearing and housing, feeding strategies etc. to be able for rearing and housing, feeding strategies etc. to be able to increase the consumption of beef meat based on dairy to increase the consumption of beef meat based on dairy calves in Denmark calves in Denmark. Specifically, we believe there will be increased focus on Specifically, we believe there will be increased focus on improving animal health and welfare and product quality in improving animal health and welfare and product quality in the steer production systems the steer production systems There will also be a wish from the society and EU to use There will also be a wish from the society and EU to use and preserve the biodiversity of the marginal grazing and preserve the biodiversity of the marginal grazing areas areas
The project reported here arises from a larger project The project reported here arises from a larger project investigating the effects of grazing system (set investigating the effects of grazing system (set stocking vs. two stocking vs. two-paddock rotation) for steers and the paddock rotation) for steers and the use of bioactive crops (especially chicory) use of bioactive crops (especially chicory). Chicory is used because of the possible positive Chicory is used because of the possible positive influence on animal health, i.e., parasite control, meat influence on animal health, i.e., parasite control, meat quality and sensory quality of meat from both steers quality and sensory quality of meat from both steers and pigs (including CLA content, selenium and and pigs (including CLA content, selenium and antioxidative antioxidative status, drip loss and boar status, drip loss and boar taint/ taint/androstenone androstenone levels) levels).
The overall objective of the entire project was to The overall objective of the entire project was to develop production methods/strategies that could develop production methods/strategies that could improve the quality aspects of organic meat improve the quality aspects of organic meat
Experimental realization of highly-efficient broadband coupling of single quantum dots to a photonic crystal waveguide
We present time-resolved spontaneous emission measurements of single quantum
dots embedded in photonic crystal waveguides. Quantum dots that couple to the
photonic crystal waveguide are found to decay up to 27 times faster than
uncoupled quantum dots. From these measurements -factors of up to 0.89
are derived, and an unprecedented large bandwidth of 20 nm is demonstrated.
This shows the promising potential of photonic crystal waveguides for efficient
single-photon sources. The scaled frequency where the enhancement is observed
is in excellent agreement with theory taking into account that the light-matter
coupling is strongly enhanced due to the significant slow-down of light in the
photonic crystal waveguide.Comment: 4 pages, 4 figures, submitted to PR
Observation of non-Markovian dynamics of a single quantum dot in a micropillar cavity
We measure the detuning-dependent dynamics of a quasi-resonantly excited
single quantum dot coupled to a micropillar cavity. The system is modeled with
the dissipative Jaynes-Cummings model where all experimental parameters are
determined by explicit measurements. We observe non-Markovian dynamics when the
quantum dot is tuned into resonance with the cavity leading to a
non-exponential decay in time. Excellent agreement between experiment and
theory is observed with no free parameters providing the first quantitative
description of an all-solid-state cavity QED system based on quantum dot
emitters.Comment: 5 pages, 3 figures, submitte
Size-Dependence of the Wavefunction of Self-Assembled Quantum Dots
The radiative and non-radiative decay rates of InAs quantum dots are measured
by controlling the local density of optical states near an interface. From
time-resolved measurements we extract the oscillator strength and the quantum
efficiency and their dependence on emission energy. From our results and a
theoretical model we determine the striking dependence of the overlap of the
electron and hole wavefunctions on the quantum dot size. We conclude that the
optical quality is best for large quantum dots, which is important in order to
optimally tailor quantum dot emitters for, e.g., quantum electrodynamics
experiments.Comment: 5 pages, 3 figure
What asteroseismology can do for exoplanets
We describe three useful applications of asteroseismology in the context of
exoplanet science: (1) the detailed characterisation of exoplanet host stars;
(2) the measurement of stellar inclinations; and (3) the determination of
orbital eccentricity from transit duration making use of asteroseismic stellar
densities. We do so using the example system Kepler-410 (Van Eylen et al.
2014). This is one of the brightest (V = 9.4) Kepler exoplanet host stars,
containing a small (2.8 Rearth) transiting planet in a long orbit (17.8 days),
and one or more additional non-transiting planets as indicated by transit
timing variations. The validation of Kepler-410 (KOI-42) was complicated due to
the presence of a companion star, and the planetary nature of the system was
confirmed after analyzing a Spitzer transit observation as well as ground-based
follow-up observations.Comment: 4 pages, Proceedings of the CoRoT Symposium 3 / Kepler KASC-7 joint
meeting, Toulouse, 7-11 July 2014. To be published by EPJ Web of Conference
Enhanced erodibility of fine-grained marine sediments by Hydrobia ulvae
Abstract The common mud snail Hydrobia ulvae is a widespread and dominant deposit feeder on fine-grained substrata along the European Atlantic coastline. Previous studies have shown that mud snail activities such as grazing, faecal pellet production and mucous production may influence physical properties of the surface sediment layer and thus depositional and erosional processes. To quantify the influence of Hydrobia density on key parameters such as erosion threshold and erosion rate, a shortterm laboratory experiment was conducted. Snails were placed on fine-grained sediment at densities of 10 000 and 50 000 ind m À 2 and erosion experiments were carried out one, three and five days after establishment of the sediment beds. Controls without H. ulvae were treated the same way. The presence of H. ulvae significantly increased the erosion rate and decreased the erosion threshold compared to snail-free control plots. The erosion rate was increased by a factor of 2 to 4 when H. ulvae were present and showed stronger influence by the snail than the erosion threshold. Snail density did not affect the erosion threshold, but the erosion rate doubled with an increase in density from 10 000 to 50 000 ind m À 2 . The erosion rate was only marginally different after one day but the difference increased over time and the erosion rate was significantly different for all treatments after five days. No significant time dependence was observed for the erosion threshold. The results generally confirm results obtained in situ and differences can be related to different hydrodynamic conditions under field and laboratory conditions.
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