scholarly journals Performance of the SoLid reactor neutrino detector

2019 ◽  
Vol 219 ◽  
pp. 08003
Author(s):  
Maja Verstraeten
Keyword(s):  
Quality Control ◽  
Energy Resolution ◽  
Neutrino Detector ◽  
Channel Response ◽  
In Situ Calibration ◽  
Reactor Neutrino ◽  
Li Isotope ◽  
Better Than

The SoLid Collaboration is currently operating a 1.6 ton neutrino detector near the Belgian BR2 reactor. Its main goal is the observation of the oscillation of electron antineutrinos to previously undetected flavour states. The highly segmented SoLid detector employs a compound scintillation technology based on PVT scintillator in combination with LiF-ZnS(Ag) screens containing the 6Li isotope. The experiment has demonstrated a channel-to-channel response that can be controlled to the level of a few percent, an energy resolution of better than 14% at 1 MeV, and a determination of the interaction vertex with a precision of 5 cm. This contribution highlights the major outcomes of the R&D program, the quality control during component manufacture and integration, the current performance and stability of the full-scale system, as well as the in-situ calibration of the detector with various radioactive sources.

scholarly journals In-situ determination of astro-comb calibrator lines to better than 10 cm s^-1

2010 ◽  
Vol 18 (12) ◽  
pp. 13239 ◽  
Author(s):  
Chih-Hao Li ◽  
Alexander G. Glenday ◽  
Andrew J. Benedick ◽  
Guoqing Chang ◽  
Li-Jin Chen ◽  
...  
Keyword(s):  
Better Than

In situ calibration and [H+] sensitivity of the fluorescent Na+indicator SBFI

2001 ◽  
Vol 280 (6) ◽  
pp. C1623-C1633 ◽  
Author(s):  
Abdoullah Diarra ◽  
Claire Sheldon ◽  
John Church
Keyword(s):  
Ph Dependence ◽  
Apparent Dissociation Constant ◽  
Simple Method ◽  
Standard Equation ◽  
In Situ Calibration ◽  
Apparent Decrease ◽  
Calibration Techniques

Despite the popularity of Na+-binding benzofuran isophthalate (SBFI) to measure intracellular free Na+ concentrations ([Na+]i), the in situ calibration techniques described to date do not favor the straightforward determination of all of the constants required by the standard equation (Grynkiewicz G, Poenie M, and Tsien RY. J Biol Chem 260: 3440–3450, 1985) to convert the ratiometric signal into [Na+]. We describe a simple method in which SBFI ratio values obtained during a “full” in situ calibration are fit by a three-parameter hyperbolic equation; the apparent dissociation constant ( K d) of SBFI for Na+ can then be resolved by means of a three-parameter hyperbolic decay equation. We also developed and tested a “one-point” technique for calibrating SBFI ratios in which the ratio value obtained in a neuron at the end of an experiment during exposure to gramicidin D and 10 mM Na+is used as a normalization factor for ratios obtained during the experiment; each normalized ratio is converted to [Na+]i using a modification of the standard equation and parameters obtained from a full calibration. Finally, we extended the characterization of the pH dependence of SBFI in situ. Although the K d of SBFI for Na+ was relatively insensitive to changes in pH in the range 6.8–7.8, acidification resulted in an apparent decrease, and alkalinization in an apparent increase, in [Na+]i values. The magnitudes of the apparent changes in [Na+]ivaried with absolute [Na+]i, and a method was developed for correcting [Na+]i values measured with SBFI for changes in intracellular pH.

scholarly journals In Situ Calibration of a New Chemcatcher Configuration for the Determination of Polar Organic Micropollutants in Wastewater Effluent

2016 ◽  
Vol 50 (17) ◽  
pp. 9469-9478 ◽  
Author(s):  
Bruce Petrie ◽  
Anthony Gravell ◽  
Graham A. Mills ◽  
Jane Youdan ◽  
Ruth Barden ◽  
...  
Keyword(s):  
Wastewater Effluent ◽  
Organic Micropollutants ◽  
In Situ Calibration

Simultaneous Determination of Phosphorus, Iron, and Aluminum in Phosphate Rock and Fertilizer Systems by Automated Colorimetric Analysis

1969 ◽  
Vol 52 (6) ◽  
pp. 1121-1126
Author(s):  
Jack L Hoyt ◽  
Donald E Jordan
Keyword(s):  
Phosphate Rock ◽  
Colorimetric Method ◽  
Iron Complex ◽  
Colorimetric Analysis ◽  
Splitting Technique ◽  
Phosphorus Iron ◽  
Effective Analysis ◽  
Better Than

Abstract An automated colorimetric method is used to simultaneously determine phosphorus, iron, and aluminum in phosphate rock and various solid and liquid fertilizer systems. Combination of an in situ dilution technique for phosphorus with a sample splitting technique results in an effective analysis rate of 60, 90, or 120 determinations/hr (20, 30, or 40 samples/hr, 3 elements/sample). Phosphorus is determined as the molybdovanadophosphate complex at 420 mμ; iron and aluminum are both determinated as “Ferron” (8-hydroxy-7-iodo-5-quinoline sulfonic acid) complexes with the iron complex determined at 610 mμ and combined iron and aluminum complexes determined at 366 mμ. The precision and accuracy are better than ±1% relative throughout the total range of 0.1 to 75% P2O5, and up to 10% Fe2O3 and 10% AL2O3.

scholarly journals Modifications for Optimization the Compaction Quality Control in Core Slate Random Filling Embankments for Linear Infrastructures

2021 ◽  
Author(s):  
Evelio Teijón-López-Zuazo ◽  
Ángel Vega-Zamanillo ◽  
Miguel Ángel Calzada-Pérez ◽  
Luis Juli-Gándara
Keyword(s):  
Quality Control ◽  
Particle Sizes ◽  
Test Procedures ◽  
Control Techniques ◽  
High Particle ◽  
Compaction Control ◽  
Geotechnical Stability ◽  
New Research

The construction of random fillings from the excavation of medium hardness rocks, with high particle sizes, presents limitations in compaction control. This research applies new control techniques with revised test procedures in the construction of the random fillings core, which constitutes the main part of the embankment, with the bigger volume and provides the geotechnical stability to the infrastructure. The maximum layer thickness researched was 800mm. As there are many types of rocks, this research is applied to metamorphic slates. Quality control has been carried out by applying new research associated with the revision of wheel impression test, topographic settlements and plate bearing test (PBT). A statistical analysis of the core of 16 slate random fillings has been carried out, with a total of 2250 in situ determination of density and moisture content, 75 wheel impression tests, 75 topographic settlement control and 75 PBT. The strong associations found between different tests have allowed to simplify the quality control.

Infra-AUV project: Metrology for low-frequency sound and vibration

2021 ◽  
Author(s):  
Lars Ceranna ◽  
Thomas Bruns ◽  
Christian Koch ◽  
Dominique Rodrigues ◽  
Stephen Robinson ◽  
...  
Keyword(s):  
Low Frequency ◽  
Monitoring Networks ◽  
Vibration Data ◽  
In Situ Calibration ◽  
Laboratory Calibration ◽  
Calibration Methods ◽  
National Measurement ◽  
Eu Project

<p>Infra-AUV is a new EU project that will establish primary measurements standards for low frequency phenomena across the fields of airborne and underwater acoustics and vibration (seismology). Combining expertise from the national measurement institutes and geophysical monitoring station operators, it will develop both high-precision laboratory-based methods of calibration and methods suitable for field use. Infra-AUV will also address requirements for reference sensors that link laboratory calibration capabilities to field requirements for measurement traceability.</p><p>To establish standards in the three technical areas, a variety of calibration principles will be employed, including extension of existing techniques such as reciprocity and optical interferometry, and development of new methods. There will also be an investigation of the potential for in-situ calibration methods, including use of both artificially generated and naturally occurring stimuli such as microseisms and microbaroms. The influence of calibration uncertainties on the determination of the measurands required by the monitoring networks will also be studied.</p><p>The project was strongly motivated by the CTBTO strategy to drive new metrology capability to underpin IMS data. The intention is to maintain interaction with stakeholders, not only in connection with the IMS, but with the broad range of users of low frequency acoustic and vibration data. </p>

Determination of crystal orientation by a zone axis method application to grain boundaries

1978 ◽  
Vol 36 (1) ◽  
pp. 426-427 ◽  
Author(s):  
A. Rocher ◽  
C. Fontaine
Keyword(s):  
Crystal Orientation ◽  
Zone Axis ◽  
Coordinate Frame ◽  
In Situ Method ◽  
Transmission Electron ◽  
Kikuchi Lines ◽  
Diffraction Patterns ◽  
Better Than

Several methods (1 → 3) have been proposed in order to determine by transmission electron microscopy (TEM) the orientation relationship between the crystal and the electron beam. The same type of method (4) has been used to find the orientation of a bicrystal. The most accurate ones (better than 0.1°) are based on the measurement of the relative position of Kikuchi lines with respect to diffraction spots. Such analysis are performed on diffraction pattern micrographs. The aim of the present work is to develop for TEM an in situ method for determination of the crystal orientation with respect to the goniometer coordinate frame, avoiding any analysis of the diffraction micrographs. The diffraction patterns used for this characterization are associated to the zone axis of the crystal. The method consists in plotting on the same stereographic projection the coordinate frame of the goniometer stage and the <100> axis of the crystal. These axis are determined from experimental indexation of three zone axis.

Parameter Estimation for Evaluation of in Situ Density and Moisture Content by using Elastic and Electromagnetic Wave Propagation

2008 ◽  
Vol 2045 (1) ◽  
pp. 19-28 ◽  
Author(s):  
Bashar Alramahi ◽  
Dante Fratta ◽  
Khalid A. Alshibli
Keyword(s):  
Quality Control ◽  
Wave Propagation ◽  
Quality Assurance ◽  
Electromagnetic Wave ◽  
Moisture Content ◽  
Water Content ◽  
Electromagnetic Wave Propagation ◽  
Soil Density

Soil density and moisture content are two essential properties in the quality control and quality assurance of projects that involve soil compaction. However, current field practices either are destructive and time-consuming (i.e., sand cone or water balloon for soil density and oven drying for moisture content) or include hazardous substances that require special handling and operating procedures (i.e., nuclear density gauge). Therefore, new robust, reliable, and nonnuclear techniques for the determination of in situ density and moisture content would assist in quality control and quality assurance processes and would allow more measurements to be performed in a shorter time. A methodology for the in situ determination of density and moisture content by using the propagation of elastic and electromagnetic waves through soils was evaluated. It is based on a semiempirical model that relates elastic wave velocity through soils to the water content, porosity, and degree of saturation. An experimental program was used to verify the model and examine its range of applicability. It was also used to examine the accuracy and limitations of the suggested methodology. An analysis was made of the experimental assessment, along with a detailed numerical study of the inversion procedure used to calculate the density and moisture content. Although the parametric and experimental study shows that the methodology can provide an estimate of density and water content rapidly and non-destructively, there are inherent accuracy and precision limitations that need to be solved. These results also show that combined elastic and electromagnetic wave propagation measurements can help in the development of a methodology that may assist in solving inconsistencies in stiffness measurements.

scholarly journals Determination of centrality in nucleus-nucleus collisions at the MPD/NICA installation

2019 ◽  
Vol 204 ◽  
pp. 03014
Author(s):  
A. Kurepin ◽  
A. Litvinenko ◽  
E. Litvinenko
Keyword(s):  
Energy Resolution ◽  
Beam Energy ◽  
Large Error ◽  
Accurate Data ◽  
Hadron Calorimeter ◽  
Collider Energy ◽  
Nica Collider ◽  
Scintillator Detector ◽  
Better Than

Measurement of the number of spectators in nucleus-nucleus collisions could be used to determine the number of nucleons participating in the interaction, i.e. get information about collision centrality. However, at energies of the NICA collider energy resolution of the forward hadron calorimeter is insufficient for separation of the amplitudes corresponding to different number of spectators. Uncertainty in the number of spectators leads to a large error in determining the centrality. For central events inaccuracy in determining the collision parameter is about 40%, for peripheral ones, no better than 30% at a beam energy of 2.5 A×GeV. The multiplicity scintillator detector will allow to obtain more accurate data. A certain method is proposed for determining the centrality, taking into account the real MPD installation geometry.

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