2,236 research outputs found
Measurement of the mass of the W boson at LEP and determination of electroweak parameters
No full textPrecise measurements of the W mass and width performed at LEP are presented, which yield M/sub W/=80.427+or-0.046 GeV and Gamma /sub W /=2.12+or-0.11 GeV. A comparison is made between this direct determination and the W mass value obtained indirectly in an analysis of other electroweak measurements. Good agreement is observed. All electroweak data are very consistent with the standard model predictions. In a combined fit an upper limit on the mass of the Higgs boson is put to M/sub H/<203 GeV at 95% confidence level. (20 refs)
Calorimetry Electronics
No full textOperations during the HL-LHC era will impose challenges on the calorimeter electronics both for the main readout and the trigger systems. Aging, radiation tolerance limits and new requirements from the trigger result in the need for substantial upgrades of the calorimeter electronics. We review the evolution of the readout architecture, the strategies and the technical developments in the front-end and back-end electronics as pursued by the calorimeter groups in the four LHC experiments, both emphasizing common aspects as well as pointing out issues specific to a given experiment
PEF assisted extraction of valuable compounds from microalgae C. vulgaris
No full textIn recent years the cultivation and exploitation of Microalgae biomass has stimulated intensive research due both to its high productivity, when compared to agriculturally grown biomass, and the large relative content of more than 50% of valuable cell components, like lipids, proteins, polysaccharides, antioxidants, vitamins and pigments (Goettel et al., 2013; Luengo et al., 2014). However, the extraction of these compounds is limited by the mass transfer of these compounds through cell membranes.
In this frame, thanks to the reduction of the resistances to mass transfer due to the induced permeabilization of plant cells, Pulsed Electric Field (PEF) technology can be used as a pre-treatment of concentrated microalgae suspension in order to enhance the extraction yield of valuable compounds (such as antioxidants and colorants) from the inner parts of the cells(Mahnič-Kalamiza et al., 2014).
In this work the effect of different PEF treatment intensity on the extraction of valuable compound from microalgae Chlorella Vulgaris was investigated.
Culture of C. vulgaris strain inoculated in TAP-medium, were cultivated in batch 26 L photo-bioreactor. Growth conditions were monitored by OD measurements at 750 nm. The algae were harvested after 18-24 days and concentrated up to a final biomass concentration of about 40-50 gdw/kgsus.
PEF experiments of different intensities (E=27-35 kV/cm, and WT=50-100- 150 kJ/kg) were carried out in a laboratory scale continuous flow unit. Determinations of time-conductivity profile as well as quantification of dry matter, protein content, total polyphenolics (TP), and antioxidant activity (AA) of the supernatant were performed.
Results showed a higher increase of the electrical conductivity of PEF treated suspension, when compared to the untreated sample. Moreover, the PEF treatment increased the dry matter content as well as the amount of proteins released into the supernatant from inside the algae cells. Additionally, increments of total phenolics and antioxidant activity were also detected.
The results obtained from this study demonstrate the potential of PEF for improving extraction of compounds of interest from the microalgae C. vulgaris
ATLAS LAr Calorimeter Electronics Upgrade
No full textThe ATLAS LAr electronics is foreseen to be upgraded for operation during the high luminosity phase of the LHC (HL-LHC). The motivation for improving the different components are presented. An overview is given about the current status of development and testing of the LAr readout electronics components for the HL-LHC. In particular the ongoing work on radiation tolerant front-end electronics (pre-amplifiers, shapers, summing amplifiers, ADC, link-on chip, powering), on high bandwidth and low latency back-end electronics, as well as electronics for new detectors, like the ATLAS MiniFCal, are presented
Effect of PEF Treatment on Extraction of Valuable Compounds from Microalgae C. vulgaris
No full textRecovery of intracellular components from microalgae requires a cell disruption step. In recent years, pulsed
electric field (PEF) treatment has been discussed to be an efficient alternative to conventional cell disruption
techniques, i.e. homogenization or bead milling.
In this work the effect of the main processing parameters of the PEF treatment on the extraction of valuable
compounds from microalgae Chlorella Vulgaris was investigated.
Culture of C. vulgaris strain inoculated in TAP-medium, were cultivated in batch 26 L photo-bioreactor. The
algae were harvested after 24 days and concentrated up to a final biomass concentration of 40.8 gdw/kg of
suspension. PEF experiments at different field strength (E=27-35 kV/cm) and energy input (WT=50-100-150
kJ/kg) were carried out in a laboratory scale continuous flow unit. Determinations of time-conductivity profile
as well as quantification of dry matter, carbohydrates, protein content, and total phenolics of the supernatant
collected after 1 h extraction, were performed.
Results showed a higher increase of the electrical conductivity of PEF treated suspension, when compared to
the untreated samples, as a result of the irreversible electroporation induced by pulse treatment. Moreover,
the PEF treatment increased the dry matter content as well as the amount of carbohydrates, proteins and
phenolic compounds released into the supernatant from inside the algae cells.
The results obtained from this study demonstrate the potential of PEF for improving extraction yield of
valuable compounds from microalgae
LHC State of the Art and News
No full textThis presentation summarizes the status of LHC and ATLAS. Recent news from LHC running and results of detector performance with 0.9 TeV and 7 TeV pp collisions are shown. Furthermore, the first physics measurements of charged particle production are presented, together with candidates for W and Z boson production. Eventually, prospects for SM measurements as well as searches for Higgs bosons and SUSY particles are given
News from LHC: Recent Results on Higgs Physics
No full textThe ATLAS and CMS experiments at the LHC have measured detailed properties of the SM-like Higgs boson discovered in 2012. Recent results on Higgs boson mass, width, spin and coupling determinations are presented. The parameters observed are furthermore interpreted in extensions to the Standard Model. Searches for additional Higgs bosons predicted in the general 2 Higgs Doublet Model (2HDM) and the Minimal Supersymmetric Standard Model (MSSM) are reported
Highlights from the LHC
No full textThe Large Hadron Collider (LHC) and the two multi-purpose LHC Detectors, ATLAS and CMS, have been operated successfully at record centre-of-mass energies of 7-8 TeV. This article presents the main physics results from proton-proton collisions based on a total luminosity of 2 x 5 fb^-1. Most recent results from Standard Model measurements, Standard Model and MSSM Higgs searches, as well as searches for supersymmetric and exotic particles are reported. Prospects for the ongoing and future data taking are presented
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