The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform
Salvatore Lorefice - One of the best experts on this subject based on the ideXlab platform.
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EUROMET.M.D-K4/EUROMET Project 702: Comparison of the calibrations of high-resolution Hydrometers for liquid density determinations
Metrologia, 2008Co-Authors: Salvatore Lorefice, Martti Heinonen, Andrea Malengo, Csilla Vámossy, Horst Bettin, H. Toth, M Do Céu Ferreira, André Gosset, Tanguy Madec, Christian BuchnerAbstract:The main objective of the EUROMET project 702 was to compare the extent of comparability among eleven participating European national metrology institutes (INRIM (IT), OMH (HU), PTB (DE), BEV (AT), IPQ (PT), LNE (FR), MIKES (FI), GUM (PL), SMU (SK), UME (TR) and VNIIM (RU)) in performing calibrations of high-resolution Hydrometers for liquid density determination in the range between 600 kg m-3 and 1300 kg m-3. By means of two groups of four similar transfer standards of excellent metrological characteristics, the participating laboratories were initially divided into two groups (petals) linked by the three density laboratories of INRIM, OMH and PTB. The results of the participating laboratories have been analyzed in this report and a good agreement was found between the results provided by most of the participants. These results allowed also determination of the degrees of equivalence of each NMI participating with the EUROMET_key comparison reference values (EU_KCRV); they will provide a basis for the review of the Calibration Measurement Capabilities (CMC) entries on Hydrometer calibration, and they allowed the degree of equivalence between pairs of NMIs to be established. The Istitituto Nazionale di Ricerca Metrologica (INRIM), Italy, formerly IMGC-CNR, coordinated the project. Main text. To reach the main text of this Paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).
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euromet m d k4 euromet project 702 comparison of the calibrations of high resolution Hydrometers for liquid density determinations
Metrologia, 2008Co-Authors: Salvatore Lorefice, Martti Heinonen, Andrea Malengo, Csilla Vámossy, Horst Bettin, H. Toth, André Gosset, Tanguy Madec, Do Ceu M Ferreira, Christian BuchnerAbstract:The main objective of the EUROMET project 702 was to compare the extent of comparability among eleven participating European national metrology institutes (INRIM (IT), OMH (HU), PTB (DE), BEV (AT), IPQ (PT), LNE (FR), MIKES (FI), GUM (PL), SMU (SK), UME (TR) and VNIIM (RU)) in performing calibrations of high-resolution Hydrometers for liquid density determination in the range between 600 kg m-3 and 1300 kg m-3. By means of two groups of four similar transfer standards of excellent metrological characteristics, the participating laboratories were initially divided into two groups (petals) linked by the three density laboratories of INRIM, OMH and PTB. The results of the participating laboratories have been analyzed in this report and a good agreement was found between the results provided by most of the participants. These results allowed also determination of the degrees of equivalence of each NMI participating with the EUROMET_key comparison reference values (EU_KCRV); they will provide a basis for the review of the Calibration Measurement Capabilities (CMC) entries on Hydrometer calibration, and they allowed the degree of equivalence between pairs of NMIs to be established. The Istitituto Nazionale di Ricerca Metrologica (INRIM), Italy, formerly IMGC-CNR, coordinated the project. Main text. To reach the main text of this Paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).
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Calibration of Hydrometers
Measurement Science and Technology, 2006Co-Authors: Salvatore Lorefice, Andrea MalengoAbstract:After a brief description of the different methods employed in periodic calibration of Hydrometers used in most cases to measure the density of liquids in the range between 500 kg m−3 and 2000 kg m−3, particular emphasis is given to the multipoint procedure based on hydrostatic weighing, known as well as Cuckow's method. The features of the calibration apparatus and the procedure used at the INRiM (formerly IMGC-CNR) density laboratory have been considered to assess all relevant contributions involved in the calibration of different kinds of Hydrometers. The uncertainty is strongly dependent on the kind of Hydrometer; in particular, the results highlight the importance of the density of the reference buoyant liquid, the temperature of calibration and the skill of operator in the reading of the scale in the whole assessment of the uncertainty. It is also interesting to realize that for high-resolution Hydrometers (division of 0.1 kg m−3), the uncertainty contribution of the density of the reference liquid is the main source of the total uncertainty, but its importance falls under about 50% for Hydrometers with a division of 0.5 kg m−3 and becomes somewhat negligible for Hydrometers with a division of 1 kg m−3, for which the reading uncertainty is the predominant part of the total uncertainty. At present the best INRiM result is obtained with commercially available Hydrometers having a scale division of 0.1 kg m−3, for which the relative uncertainty is about 12 × 10−6.
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An image processing approach to calibration of Hydrometers
Metrologia, 2004Co-Authors: Salvatore Lorefice, Andrea MalengoAbstract:The usual method adopted for multipoint calibration of glass Hydrometers is based on the measurement of the buoyancy by hydrostatic weighing when the Hydrometer is plunged in a reference liquid up to the scale mark to be calibrated.An image processing approach is proposed by the authors to align the relevant scale mark with the reference liquid surface level. The method uses image analysis with a data processing technique and takes into account the perspective error. For this purpose a CCD camera with a pixel matrix of 604H × 576V and a lens of 16 mm focal length were used.High accuracy in the Hydrometer reading was obtained as the resulting reading uncertainty was lower than 0.02 mm, about a fifth of the usual figure with the visual reading made by an operator.
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Bilateral comparisons of Hydrometer calibrations between the IMGC-LNE and the IMGC-MIKES
Metrologia, 2000Co-Authors: Salvatore Lorefice, Martti Heinonen, T MadecAbstract:The Istituto di Metrologia G. Colonnetti (IMGC, Italy), the Laboratoire National d'Essais (LNE, France) and the Mittatekniikan Keskus (MIKES, Finland) support primary calibration facilities used both for liquid density measurements and for Hydrometer calibrations. In 1998, two independent bilateral comparisons of the calibration of standard Hydrometers were carried out between the IMGC and the LNE and between the IMGC and the MIKES, the main purpose being to assess the present state of mutual compatibility in the density range 600 kg/m3 to 2000 kg/m3 among the three laboratories. The results show agreement within the uncertainties declared by the laboratories, although the MIKES measurements are in general 0.2 kg/m3 lower than those of the IMGC and the LNE measurements are systematically 0.04 kg/m3 higher than those of the IMGC. Both differences are smaller than half of the least-scale division of the transfer Hydrometer used.
C.h. Lee - One of the best experts on this subject based on the ideXlab platform.
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A novel approach for estimating sugar and alcohol concentrations in wines using refractometer and Hydrometer.
Journal of food science, 2009Co-Authors: Hyewon Son, Y.s. Hong, W.m. Park, C.h. LeeAbstract:To estimate true Brix and alcoholic strength of must and wines without distillation, a novel approach using a refractometer and a Hydrometer was developed. Initial Brix (I.B.), apparent refractometer Brix (A.R.), and apparent Hydrometer Brix (A.H.) of must were measured by refractometer and Hydrometer, respectively. Alcohol content (A) was determined with a Hydrometer after distillation and true Brix (T.B.) was measured in distilled wines using a refractometer. Strong proportional correlations among A.R., A.H., T.B., and A in sugar solutions containing varying alcohol concentrations were observed in preliminary experiments. Similar proportional relationships among the parameters were also observed in must, which is a far more complex system than the sugar solution. To estimate T.B. and A of must during alcoholic fermentation, a total of 6 planar equations were empirically derived from the relationships among the experimental parameters. The empirical equations were then tested to estimate T.B. and A in 17 wine products, and resulted in good estimations of both quality factors. This novel approach was rapid, easy, and practical for use in routine analyses or for monitoring quality of must during fermentation and final wine products in a winery and/or laboratory.
Andrea Malengo - One of the best experts on this subject based on the ideXlab platform.
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EUROMET.M.D-K4/EUROMET Project 702: Comparison of the calibrations of high-resolution Hydrometers for liquid density determinations
Metrologia, 2008Co-Authors: Salvatore Lorefice, Martti Heinonen, Andrea Malengo, Csilla Vámossy, Horst Bettin, H. Toth, M Do Céu Ferreira, André Gosset, Tanguy Madec, Christian BuchnerAbstract:The main objective of the EUROMET project 702 was to compare the extent of comparability among eleven participating European national metrology institutes (INRIM (IT), OMH (HU), PTB (DE), BEV (AT), IPQ (PT), LNE (FR), MIKES (FI), GUM (PL), SMU (SK), UME (TR) and VNIIM (RU)) in performing calibrations of high-resolution Hydrometers for liquid density determination in the range between 600 kg m-3 and 1300 kg m-3. By means of two groups of four similar transfer standards of excellent metrological characteristics, the participating laboratories were initially divided into two groups (petals) linked by the three density laboratories of INRIM, OMH and PTB. The results of the participating laboratories have been analyzed in this report and a good agreement was found between the results provided by most of the participants. These results allowed also determination of the degrees of equivalence of each NMI participating with the EUROMET_key comparison reference values (EU_KCRV); they will provide a basis for the review of the Calibration Measurement Capabilities (CMC) entries on Hydrometer calibration, and they allowed the degree of equivalence between pairs of NMIs to be established. The Istitituto Nazionale di Ricerca Metrologica (INRIM), Italy, formerly IMGC-CNR, coordinated the project. Main text. To reach the main text of this Paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).
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euromet m d k4 euromet project 702 comparison of the calibrations of high resolution Hydrometers for liquid density determinations
Metrologia, 2008Co-Authors: Salvatore Lorefice, Martti Heinonen, Andrea Malengo, Csilla Vámossy, Horst Bettin, H. Toth, André Gosset, Tanguy Madec, Do Ceu M Ferreira, Christian BuchnerAbstract:The main objective of the EUROMET project 702 was to compare the extent of comparability among eleven participating European national metrology institutes (INRIM (IT), OMH (HU), PTB (DE), BEV (AT), IPQ (PT), LNE (FR), MIKES (FI), GUM (PL), SMU (SK), UME (TR) and VNIIM (RU)) in performing calibrations of high-resolution Hydrometers for liquid density determination in the range between 600 kg m-3 and 1300 kg m-3. By means of two groups of four similar transfer standards of excellent metrological characteristics, the participating laboratories were initially divided into two groups (petals) linked by the three density laboratories of INRIM, OMH and PTB. The results of the participating laboratories have been analyzed in this report and a good agreement was found between the results provided by most of the participants. These results allowed also determination of the degrees of equivalence of each NMI participating with the EUROMET_key comparison reference values (EU_KCRV); they will provide a basis for the review of the Calibration Measurement Capabilities (CMC) entries on Hydrometer calibration, and they allowed the degree of equivalence between pairs of NMIs to be established. The Istitituto Nazionale di Ricerca Metrologica (INRIM), Italy, formerly IMGC-CNR, coordinated the project. Main text. To reach the main text of this Paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).
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Calibration of Hydrometers
Measurement Science and Technology, 2006Co-Authors: Salvatore Lorefice, Andrea MalengoAbstract:After a brief description of the different methods employed in periodic calibration of Hydrometers used in most cases to measure the density of liquids in the range between 500 kg m−3 and 2000 kg m−3, particular emphasis is given to the multipoint procedure based on hydrostatic weighing, known as well as Cuckow's method. The features of the calibration apparatus and the procedure used at the INRiM (formerly IMGC-CNR) density laboratory have been considered to assess all relevant contributions involved in the calibration of different kinds of Hydrometers. The uncertainty is strongly dependent on the kind of Hydrometer; in particular, the results highlight the importance of the density of the reference buoyant liquid, the temperature of calibration and the skill of operator in the reading of the scale in the whole assessment of the uncertainty. It is also interesting to realize that for high-resolution Hydrometers (division of 0.1 kg m−3), the uncertainty contribution of the density of the reference liquid is the main source of the total uncertainty, but its importance falls under about 50% for Hydrometers with a division of 0.5 kg m−3 and becomes somewhat negligible for Hydrometers with a division of 1 kg m−3, for which the reading uncertainty is the predominant part of the total uncertainty. At present the best INRiM result is obtained with commercially available Hydrometers having a scale division of 0.1 kg m−3, for which the relative uncertainty is about 12 × 10−6.
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An image processing approach to calibration of Hydrometers
Metrologia, 2004Co-Authors: Salvatore Lorefice, Andrea MalengoAbstract:The usual method adopted for multipoint calibration of glass Hydrometers is based on the measurement of the buoyancy by hydrostatic weighing when the Hydrometer is plunged in a reference liquid up to the scale mark to be calibrated.An image processing approach is proposed by the authors to align the relevant scale mark with the reference liquid surface level. The method uses image analysis with a data processing technique and takes into account the perspective error. For this purpose a CCD camera with a pixel matrix of 604H × 576V and a lens of 16 mm focal length were used.High accuracy in the Hydrometer reading was obtained as the resulting reading uncertainty was lower than 0.02 mm, about a fifth of the usual figure with the visual reading made by an operator.
Christian Buchner - One of the best experts on this subject based on the ideXlab platform.
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EUROMET.M.D-K4/EUROMET Project 702: Comparison of the calibrations of high-resolution Hydrometers for liquid density determinations
Metrologia, 2008Co-Authors: Salvatore Lorefice, Martti Heinonen, Andrea Malengo, Csilla Vámossy, Horst Bettin, H. Toth, M Do Céu Ferreira, André Gosset, Tanguy Madec, Christian BuchnerAbstract:The main objective of the EUROMET project 702 was to compare the extent of comparability among eleven participating European national metrology institutes (INRIM (IT), OMH (HU), PTB (DE), BEV (AT), IPQ (PT), LNE (FR), MIKES (FI), GUM (PL), SMU (SK), UME (TR) and VNIIM (RU)) in performing calibrations of high-resolution Hydrometers for liquid density determination in the range between 600 kg m-3 and 1300 kg m-3. By means of two groups of four similar transfer standards of excellent metrological characteristics, the participating laboratories were initially divided into two groups (petals) linked by the three density laboratories of INRIM, OMH and PTB. The results of the participating laboratories have been analyzed in this report and a good agreement was found between the results provided by most of the participants. These results allowed also determination of the degrees of equivalence of each NMI participating with the EUROMET_key comparison reference values (EU_KCRV); they will provide a basis for the review of the Calibration Measurement Capabilities (CMC) entries on Hydrometer calibration, and they allowed the degree of equivalence between pairs of NMIs to be established. The Istitituto Nazionale di Ricerca Metrologica (INRIM), Italy, formerly IMGC-CNR, coordinated the project. Main text. To reach the main text of this Paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).
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euromet m d k4 euromet project 702 comparison of the calibrations of high resolution Hydrometers for liquid density determinations
Metrologia, 2008Co-Authors: Salvatore Lorefice, Martti Heinonen, Andrea Malengo, Csilla Vámossy, Horst Bettin, H. Toth, André Gosset, Tanguy Madec, Do Ceu M Ferreira, Christian BuchnerAbstract:The main objective of the EUROMET project 702 was to compare the extent of comparability among eleven participating European national metrology institutes (INRIM (IT), OMH (HU), PTB (DE), BEV (AT), IPQ (PT), LNE (FR), MIKES (FI), GUM (PL), SMU (SK), UME (TR) and VNIIM (RU)) in performing calibrations of high-resolution Hydrometers for liquid density determination in the range between 600 kg m-3 and 1300 kg m-3. By means of two groups of four similar transfer standards of excellent metrological characteristics, the participating laboratories were initially divided into two groups (petals) linked by the three density laboratories of INRIM, OMH and PTB. The results of the participating laboratories have been analyzed in this report and a good agreement was found between the results provided by most of the participants. These results allowed also determination of the degrees of equivalence of each NMI participating with the EUROMET_key comparison reference values (EU_KCRV); they will provide a basis for the review of the Calibration Measurement Capabilities (CMC) entries on Hydrometer calibration, and they allowed the degree of equivalence between pairs of NMIs to be established. The Istitituto Nazionale di Ricerca Metrologica (INRIM), Italy, formerly IMGC-CNR, coordinated the project. Main text. To reach the main text of this Paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).
M. Naguib A. Bedaiwy - One of the best experts on this subject based on the ideXlab platform.
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A simplified approach for determining the Hydrometer's dynamic settling depth in particle-size analysis
CATENA, 2012Co-Authors: M. Naguib A. BedaiwyAbstract:Abstract In particle-size analysis by the Hydrometer method, the velocity of particle sedimentation (defined as the effective distance of fall, h e travelled over time interval, t ) is determined by particle size, expressed as equivalent diameter d . The standard method uses the equation h e = − 0.164 R + 16.3 to calculate h e from Hydrometer reading R . This approach involves two main problems: i) This equation is exclusive to the particular ASTM-H152 Hydrometer used to derive it, and must be changed for any other ASTM-H152 Hydrometer that has different dimensions; ii) Changing the equation to fit another ASTM-H152 Hydrometer requires the determination of the bulb volume of every Hydrometer to be used, in addition to its other dimensions, as well as the exact diameter of each sedimentation cylinder. Furthermore, the original equation is often applied, erroneously, to other ASTM-H152 type Hydrometers without change, which could produce misleading results. In order to avoid these limitations and problems, a simplified approach is presented and evaluated. The approach simply bases the determination of h e directly on the geometric center (g.c.) of the Hydrometer bulb rather than the center of buoyancy, and h e is measured as the distance from the reading mark on the Hydrometer stem to that geometric center. Results showed that the error resulting from applying the standard equation to an ASTM-H152 Hydrometer that has different dimensions ranged between 6.26% and 4.41% for the range of 0–40 g/L of Hydrometer readings. Results also indicated that using the g.c. for determining h e resulted in particle-size distribution curves that were essentially similar to those determined based on the standard equation specific to the examined cases. Comparing the arrays of diameters determined based on the two methods at designated sampling times for 28 tested soils, no statistical differences were found ( P
