1,758 research outputs found
From Grain to Feed
Horse beans are used as an example of grain, which have potentials to substitute fish meal in fish feed. After several grinding and fractionation steps it was possible to obtain a protein-rich horse bean fraction with a yield of 19 %. This fraction contained 55.9 % protein. The high protein content together with the amino acid profile makes the fraction very suitable as a substitute to fish meal in fish feed. The protein-rich fraction was used as a successful additive in extruded fish pellets
Robust entanglement generation by reservoir engineering
Following a recent proposal [C. Muschik et. al., Phys. Rev. A 83, 052312
(2011)], engineered dissipative processes have been used for the generation of
stable entanglement between two macroscopic atomic ensembles at room
temperature [H. Krauter et. al., Phys. Rev. Lett. 107, 080503 (2011)]. This
experiment included the preparation of entangled states which are continuously
available during a time interval of one hour. Here, we present additional
material, further-reaching data and an extension of the theory developed in [C.
Muschik et. al., Phys. Rev. A 83, 052312 (2011)]. In particular, we show how
the combination of the entangling dissipative mechanism with measurements can
give rise to a substantial improvement of the generated entanglement in the
presence of noise.Comment: Submitted to Journal of Physics B, special issue on "Quantum Memory
Effects of ground movements on realistic guide models for the European Spallation Source
We model the effect of ground movement, based on empirical experience, on the
transport properties of long neutron guides by ray-tracing simulations. Our
results reproduce the large losses found by an earlier study for a simple
model, while for a more realistic engineering model of guide mounting, we find
the losses to be significantly smaller than earlier predicted. A detailed study
of the guide for the cold neutron spectrometer BIFROST at the European
Spallation Source shows that the loss is 7.0(5) % for wavelengths of 2.3-4.0
{\AA}; the typical operational wavelength range of the instrument. This amount
of loss does not call for mitigation by overillumination as suggested in the
previous work. Our work serves to quantify the robustness of the transport
properties of long neutron guides, in construction or planning at neutron
facilities worldwide.Comment: 8 pages, 12 figure
Hyperelliptic curves, the scanning map, and moments of families of quadratic L-functions
We compute the stable homology of the braid group with coefficients in any
Schur functor applied to the integral reduced Burau representation. This may be
considered as a hyperelliptic analogue of the Mumford conjecture (Madsen-Weiss
theorem) with twisted coefficients. We relate the result to the function field
case of conjectures of Conrey-Farmer-Keating-Rubinstein-Snaith on moments of
families of quadratic L-functions. In particular, we formulate a purely
topological homological stability conjecture, which when combined with our
calculations would imply a precise asymptotic formula for all moments in the
rational function field case.Comment: 91 page
Entanglement generated by dissipation and steady state entanglement of two macroscopic objects
Entanglement is a striking feature of quantum mechanics and an essential
ingredient in most applications in quantum information. Typically, coupling of
a system to an environment inhibits entanglement, particularly in macroscopic
systems. Here we report on an experiment, where dissipation continuously
generates entanglement between two macroscopic objects. This is achieved by
engineering the dissipation using laser- and magnetic fields, and leads to
robust event-ready entanglement maintained for 0.04s at room temperature. Our
system consists of two ensembles containing about 10^{12} atoms and separated
by 0.5m coupled to the environment composed of the vacuum modes of the
electromagnetic field. By combining the dissipative mechanism with a continuous
measurement, steady state entanglement is continuously generated and observed
for up to an hour.Comment: This is an update of the preprint from June 2010. It includes new
results on the creation of steady state entanglement, which has been
maintained up to one hou
Collagen Type I Improves the Differentiation of Human Embryonic Stem Cells towards Definitive Endoderm
Human embryonic stem cells have the ability to generate all cell types in the body and can potentially provide an unlimited source of cells for cell replacement therapy to treat degenerative diseases such as diabetes. Current differentiation protocols of human embryonic stem cells towards insulin producing beta cells focus on soluble molecules whereas the impact of cell-matrix interactions has been mainly unattended. In this study almost 500 different extracellular matrix protein combinations were screened to systemically identify extracellular matrix proteins that influence differentiation of human embryonic stem cells to the definitive endoderm lineage. The percentage of definitive endoderm cells after differentiation on collagen I and fibronectin was >85% and 65%, respectively. The cells on collagen I substrates displayed different morphology and gene expression during differentiation as assessed by time lapse studies compared to cells on the other tested substrates. Global gene expression analysis showed that cells differentiated on collagen I were largely similar to cells on fibronectin after completed differentiation. Collectively, the data suggest that collagen I induces a more rapid and consistent differentiation of stem cells to definitive endoderm. The results shed light on the importance of extracellular matrix proteins for differentiation and also points to a cost effective and easy method to improve differentiation
Contactless graphene conductance measurements: the effect of device fabrication on terahertz time-domain spectroscopy
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