2,715 research outputs found
Freshwater Culture Of Salmonids In Recirculating Aquaculture Systems (RAS) With Emphasis On The Monitoring And Control Of Key Environmental Parameters
This report is intended as a briefing paper on Recirculating Aquaculture Systems with emphasis on the monitoring of water quality parameters relating to the freshwater culture of the Arctic charr Salvelinus alpinus
Applications of proxy system modeling in high resolution paleoclimatology
AbstractA proxy system model may be defined as the complete set of forward and mechanistic processes by which the response of a sensor to environmental forcing is recorded and subsequently observed in a material archive. Proxy system modeling complements and sharpens signal interpretations based solely on statistical analyses and transformations; provides the basis for observing network optimization, hypothesis testing, and data-model comparisons for uncertainty estimation; and may be incorporated as weak but mechanistically-plausible constraints into paleoclimatic reconstruction algorithms. Following a review illustrating these applications, we recommend future research pathways, including development of intermediate proxy system models for important sensors, archives, and observations; linking proxy system models to climate system models; hypothesis development and evaluation; more realistic multi-archive, multi-observation network design; examination of proxy system behavior under extreme conditions; and generalized modeling of the total uncertainty in paleoclimate reconstructions derived from paleo-observations
Plans for laser spectroscopy of trapped cold hydrogen-like HCI
Laser spectroscopy studies are being prepared to measure the 1s ground state
hyperfine splitting in trapped cold highly charged ions. The purpose of such
experiments is to test quantum electrodynamics in the strong electric field
regime. These experiments form part of the HITRAP project at GSI. A brief
review of the planned experiments is presented.Comment: 4 pages, 4 figures, accepted for publication (NIMB
Plans for laser spectroscopy of trapped cold hydrogen-like HCI
Laser spectroscopy studies are being prepared to measure the 1s ground state
hyperfine splitting in trapped cold highly charged ions. The purpose of such
experiments is to test quantum electrodynamics in the strong electric field
regime. These experiments form part of the HITRAP project at GSI. A brief
review of the planned experiments is presented.Comment: 4 pages, 4 figures, accepted for publication (NIMB
Plans for laser spectroscopy of trapped cold hydrogen-like HCI
Laser spectroscopy studies are being prepared to measure the 1s ground state
hyperfine splitting in trapped cold highly charged ions. The purpose of such
experiments is to test quantum electrodynamics in the strong electric field
regime. These experiments form part of the HITRAP project at GSI. A brief
review of the planned experiments is presented.Comment: 4 pages, 4 figures, accepted for publication (NIMB
Hierarchical Gaussian process mixtures for regression
As a result of their good performance in practice and their desirable analytical properties, Gaussian process regression models are becoming increasingly of interest in statistics, engineering and other fields. However, two major problems arise when the model is applied to a large data-set with repeated measurements. One stems from the systematic heterogeneity among the different replications, and the other is the requirement to invert a covariance matrix which is involved in the implementation of the model. The dimension of this matrix equals the sample size of the training data-set. In this paper, a Gaussian process mixture model for regression is proposed for dealing with the above two problems, and a hybrid Markov chain Monte Carlo (MCMC) algorithm is used for its implementation. Application to a real data-set is reported
A Matrix Model for AdS2
A matrix quantum mechanics with potential and an SL(2,R)
conformal symmetry is conjectured to be dual to two-dimensional type 0A string
theory on AdS with units of RR flux.Comment: 12 page
Ni-Cr textured substrates with reduced ferromagnetism for coated conductor applications
A series of biaxially textured Ni(1-x)Cr(x) materials, with compositions x =
0, 7, 9, 11, and 13 at % Cr, have been studied for use as substrate materials
in coated conductor applications with high temperature superconductors. The
magnetic properties were investigated, including the hysteretic loss in a Ni-7
at % Cr sample that was controllably deformed; for comparison, the loss was
also measured in a similarly deformed pure Ni substrate. Complementary X-ray
diffraction studies show that thermo-mechanical processing produces nearly
complete {100} cube texturing, as desired for applications.Comment: PDF only; 19 pp., incl 10 figure
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