We investigate the possibility to constrain the intrinsic charm probability
w
c
c
¯
=
P
c
c
¯
/
p
using first ATLAS data on the associated production of prompt photons and charm-quark jets in
pp
...collisions at
s
=
8
TeV. The upper limit
w
c
c
¯
<
1.93
% is obtained at the 68 % confidence level. This constraint is primarily determined from the theoretical scale and systematical experimental uncertainties. Suggestions for reducing these uncertainties are discussed. The implications of intrinsic heavy quarks in the proton for future studies at the LHC are also discussed.
This article presents an ecologically safe aqueous two-phase system based on poly(ethylene oxide) with a molecular weight of 1500, designed for complex extraction of Ni(II), Co(II), Fe(III), Mn(II), ...Zn(II), Cu(II), and Al(III) from nitrate solutions. A kinetic dependence has been investigated for a distribution ratio for the metals examined. The influence of pH-values, temperature, initial metal concentration, and nitric acid content have on the extraction of a wide range of metals in the heterogeneous poly(ethylene oxide) 1500-NaNO
-H
O system has been discovered. As a result, the complex extraction of metals (E
> 60%) was achieved in one step of extraction without introducing additional chemicals into the system.
Pigments and binders for obtaining radiation-resistant thermal-control coatings (TCC) for spacecraft were studied. A radiation-resistant thermal-control coating was obtained on the basis of the ...chosen components. The 15-year resistance of the coating in a geostationary orbit (GSO) was evaluated on the basis of ground-based tests. The comparative characteristics of white TCC (based on BaSO
4
), which are currently the most widely used coatings in Russia, are presented.
•Integration of snow, glacier and hydrologic modeling in a data sparse region.•Modeling the contribution of snow and glacier melt to streamflow from Himalaya basins.•Inputs derived primarily from ...NASA remote sensing and climate data products.•Open source energy balance snow and glacier melt model now part of EPA BASINS.
Quantification of the contribution of the hydrologic components (snow, ice and rain) to river discharge in the Hindu Kush Himalayan (HKH) region is important for decision-making in water sensitive sectors, and for water resources management and flood risk reduction. In this area, access to and monitoring of the glaciers and their melt outflow is challenging due to difficult access, thus modeling based on remote sensing offers the potential for providing information to improve water resources management and decision making. This paper describes an integrated modeling system developed using downscaled NASA satellite based and earth system data products coupled with in-situ hydrologic data to assess the contribution of snow and glaciers to the flows of the rivers in the HKH region. Snow and glacier melt was estimated using the Utah Energy Balance (UEB) model, further enhanced to accommodate glacier ice melt over clean and debris-covered tongues, then meltwater was input into the USGS Geospatial Stream Flow Model (GeoSFM). The two model components were integrated into Better Assessment Science Integrating point and Nonpoint Sources modeling framework (BASINS) as a user-friendly open source system and was made available to countries in high Asia. Here we present a case study from the Langtang Khola watershed in the monsoon-influenced Nepal Himalaya, used to validate our energy balance approach and to test the applicability of our modeling system. The snow and glacier melt model predicts that for the eight years used for model evaluation (October 2003–September 2010), the total surface water input over the basin was 9.43m, originating as 62% from glacier melt, 30% from snowmelt and 8% from rainfall. Measured streamflow for those years were 5.02m, reflecting a runoff coefficient of 0.53. GeoSFM simulated streamflow was 5.31m indicating reasonable correspondence between measured and model confirming the capability of the integrated system to provide a quantification of water availability.
Properties of the Ukraine polystyrene-based plastic scintillator UPS 923A Artikov, A.; Budagov, J.; Chirikov-Zorin, I. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/2005, Letnik:
555, Številka:
1
Journal Article
Recenzirano
The polystyrene-based scintillator UPS 923A was chosen for upgrading of the muon system for the CDF detector at the Fermilab Tevatron. Properties of this scintillator such as light output, light ...attenuation, long-term stability and also timing characteristics of scintillators and wavelength-shifting fibers were investigated. The method for the Bulk Attenuation Length measurements of the scintillator to its own light emitted was proposed.
Comparison measurements of the characteristics of the UPS 923A and the polyvinyltoluene-based scintillator NE 114 are done. It was found that natural aging of the NE 114 was two times faster than that of the UPS 923A.
In Nepal, as the spatial distribution of rain gauges is not sufficient to provide detailed perspective on the highly varied spatial nature of rainfall, satellite‐based rainfall estimates provides the ...opportunity for timely estimation. This paper presents the flood prediction of Narayani Basin at the Devghat hydrometric station (32 000 km2) using bias‐adjusted satellite rainfall estimates and the Geospatial Stream Flow Model (GeoSFM), a spatially distributed, physically based hydrologic model. The GeoSFM with gridded gauge observed rainfall inputs using kriging interpolation from 2003 was used for calibration and 2004 for validation to simulate stream flow with both having a Nash Sutcliff Efficiency of above 0.7. With the National Oceanic and Atmospheric Administration Climate Prediction Centre's rainfall estimates (CPC_RFE2.0), using the same calibrated parameters, for 2003 the model performance deteriorated but improved after recalibration with CPC_RFE2.0 indicating the need to recalibrate the model with satellite‐based rainfall estimates. Adjusting the CPC_RFE2.0 by a seasonal, monthly and 7‐day moving average ratio, improvement in model performance was achieved. Furthermore, a new gauge‐satellite merged rainfall estimates obtained from ingestion of local rain gauge data resulted in significant improvement in flood predictability. The results indicate the applicability of satellite‐based rainfall estimates in flood prediction with appropriate bias correction.
A sophisticated photomultiplier response function was suggested for single photoelectron analysis of the compact metal package photomultiplier spectra. The spectra taken by Hamamatsu R5600 ...photomultipliers have been analysed by the presented method. The detailed analysis shows that the method appropriately describes the process of charge multiplication in these photomultipliers and can be used to find their basic internal parameters.
Design and construction of new central and forward muon counters for CDF II Artikov, A.; Budagov, J.; Chirikov-Zorin, I. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
02/2005, Letnik:
538, Številka:
1
Journal Article
Recenzirano
Odprti dostop
New scintillation counters have been designed and constructed for the upgradation of the CDF detector at the Fermilab Tevatron in order to complete the muon coverage of the central detector and to ...extend it to a larger pseudorapidity interval. A novel light collection technique using wavelength shifting fibers, together with high-quality polystyrene-based scintillator resulted in compact counters with good and stable light collection efficiency over lengths extending up to 320
cm. Their design and construction is described and results of their initial performance are reported.
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