32,355 research outputs found
Heavy flavour physics results from LEP1
Recent heavy flavour results from the LEP experiments are presented. These
include a search for new physics in rare B decays, a new model-independent
measurement of the b-quark fragmentation function at the Z peak, updated
measurements of |Vcb|, results on DeltaGamma_s, searches for B0s oscillations,
as well as a new measurement of sin(2beta). Many combined results, obtained by
dedicated working groups are also given...Comment: 6 pages, 5 figure
Sources of variations in total column carbon dioxide
Observations of gradients in the total CO_2 column,
(CO2), are expected to provide improved constraints
on surface fluxes of CO_2. Here we use a general circulation
model with a variety of prescribed carbon fluxes to investigate how variations in (CO_2) arise. On diurnal scales, variations are small and are forced by both local fluxes and advection. On seasonal scales, gradients are set by the north-south flux distribution. On synoptic scales, variations arise due to large-scale eddy-driven disturbances of the meridional gradient. In this case, because variations in (CO_2) are tied to synoptic
activity, significant correlations exist between (CO_2)
and dynamical tracers. We illustrate how such correlations
can be used to describe the north-south gradients of (CO_2)
and the underlying fluxes on continental scales. These simulations suggest a novel analysis framework for using column observations in carbon cycle science
Electronic detection of weak spectrum links
Recording spectroscopic data by digital and analog electronic systems - Detection of weak spectrum line
Photoelectric Detection of Weak Spectrum Lines
Photoelectric detection of weak spectral lines by application of digital and gated filter electronic devices to optical spectrometr
The Benefish consortium 24 month report WP6: productivity modelling of OWI's and welfare intervention measures
In order to accurately model all costs and benefits associated with welfare interventions for farmed fish it is necessary to establish how any welfare actions affect productivity. Productivity modelling within Benefish has been conducted in WP6. WP6 aimed to model relationships between welfare interventions, changes in OWIâs and measures of productivity. It did so focusing only on the effects which were biological in nature: economic costs and benefits attributed to changes in productivity are addressed in WP8
Emerging Risks in the Dutch Food Chain report on project 2: Application of indicator analyses on several critical points in the salmon production chain and identification of related data sources
An indicator analysis was performed on the fish production chain by assessing the indicators which may be of importance for the detection of emerging risks. The indicators were embedded in a ârisk pathwayâ, in which the relations between different indicators could be illustrated. The risk pathways illustrate the main characteristics of the salmon production chain. However further research is required in order to develop further interaction with other sectors, and production chains to bring emerging risk detection to the next level. In relation to the assigned indicators, a selection of (electronic) data sources were identified in order to be able to combine data flows with indicators and risk pathways. The indicators were analyzed for availability, sources of data entry, validation of data sources, update frequency and delay in input. The combination of risk pathways, indicators and data sources, will be one of the key information sources for the further development of an Emerging Risk Detection Support System (ERDSS)
Heavy Quark Spectroscopy, Lifetimes and Oscillations
The experimental status of the spectroscopy of heavy flavoured hadrons is presented. Lifetime and particle-antiparticle mixing measurements are reviewed. The most recent results are emphasized and world averages are given. Implications for the CKM matrix elements are discussed
Exact gravitational lensing and rotation curve
Based on the geodesic equation in a static spherically symmetric metric we
discuss the rotation curve and gravitational lensing. The rotation curve
determines one function in the metric without assuming Einstein's equations.
Then lensing is considered in the weak field approximation of general
relativity. From the null geodesics we derive the lensing equation and
corrections to it.Comment: 12 pages, 1 figur
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