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Journal articles on the topic 'Method calibration curve'

Author: Grafiati

Published: 4 May 2022

Last updated: 5 May 2022

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1

Zhang, Bao Long, Shao Jing Zhang, Wei Qi Ding, and Hui Shuang Shi. "Fisheye Lens Distortion Calibration Based on the Lens Charactetic Curves." Applied Mechanics and Materials 519-520 (February 2014): 636–39. http://dx.doi.org/10.4028/www.scientific.net/amm.519-520.636.

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The fisheye lens is a kind of ultra wide angle lens, which can produce a big super-wide-angle lens distortion. In order to cover a large scope of light, barrel distortion is artificially added to the optical system. However, in some cases this distortion is not allowed, then it requires calibrations of those distortions. Most of the traditional distortion calibration method uses target plane calibration to do it. This paper discusses the way of design fisheye lens, through which we can know the forming process of distortion clearly. Based on this paper, a simple and effective calibration metho

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Hajiyev, Chingiz. "Sensor Calibration Design Based on D-Optimality Criterion." Metrology and Measurement Systems 23, no. 3 (2016): 413–24. http://dx.doi.org/10.1515/mms-2016-0029.

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AbstractIn this study, a procedure for optimal selection of measurement points using the D-optimality criterion to find the best calibration curves of measurement sensors is proposed. The coefficients of calibration curve are evaluated by applying the classical Least Squares Method (LSM). As an example, the problem of optimal selection for standard pressure setters when calibrating a differential pressure sensor is solved. The values obtained from the D-optimum measurement points for calibration of the differential pressure sensor are compared with those from actual experiments. Comparison of

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Xia, Tian, Chao Jin, Xiao Yang Jiang, and Yi Zhong Li. "A Camera Calibration Method Using Quadratic Curve Fitting." Advanced Materials Research 591-593 (November 2012): 1281–84. http://dx.doi.org/10.4028/www.scientific.net/amr.591-593.1281.

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The camera calibration is an essential part in the machine vision,the camera calibration is to establish the relationship between the camera image pixellocation and scene position,the approach is based on the camera model,solving the model parameters of the camera image coordinates and world coordinates from the known feature points. Using the camera calibration method based on quadratic curve,this article selects a template consists of two concentric circles and two concentric ovals.We shot 4 images in different directions,and use different combinations of three of the four images to calibrat

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Mendes, Vera M., Margarida Coelho, Angelo R. Tomé, Rodrigo A. Cunha, and Bruno Manadas. "Validation of an LC-MS/MS Method for the Quantification of Caffeine and Theobromine Using Non-Matched Matrix Calibration Curve." Molecules 24, no. 16 (2019): 2863. http://dx.doi.org/10.3390/molecules24162863.

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Caffeine is one of the most widely consumed psycho-stimulants. The study of the beneficial effects of caffeine consumption to decrease the risk of developing several neuropsychiatric pathologies is receiving increasing attention. Thus, accurate and sensitive methods have been developed, mainly by LC-MS/MS, in order to quantify caffeine and its metabolites. These quantifications of caffeine and its metabolites by LC-MS/MS require a considerable effort to select or find a surrogate matrix, without the compounds of interest, to be used in the calibration curves. Thus, we evaluated the possibility

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Buck, C. E., and P. G. Blackwell. "Formal Statistical Models for Estimating Radiocarbon Calibration Curves." Radiocarbon 46, no. 3 (2004): 1093–102. http://dx.doi.org/10.1017/s0033822200033026.

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We report on the development and implementation of a model-based statistical method for the estimation of radiocarbon calibration curves using diverse data. The method takes account of uncertainty on both the 14C and calendar scales, coherently integrating data, the calendar age estimates of which arise from different dating methods. It also allows for correlation between observations, if they have particular sources of uncertainty in common. We adopt an approach based on a random walk model, tailoring it to take account of possible calendar age offsets between different data sources by adding

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van der Plicht, J. "Calibration of the 14C time scale: towards the complete dating range." Netherlands Journal of Geosciences - Geologie en Mijnbouw 81, no. 1 (2002): 85–96. http://dx.doi.org/10.1017/s001677460002059x.

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AbstractRadiocarbon calibration based on dendro-chronology and U-series dated corals yield a calibration curve (INTCAL98) well into the Late Glacial, back to ca. 15,600 calendar years ago. Beyond this limit, various calibration curves are produced, mainly based on laminated sediments and various carbonates dated by U-series isotopes. Such calibration curves now cover the complete 14C dating range of about 45,000 years, but are not consistent with each other. Each calibration method (other than dendro-chronology) has its own assumptions and pitfalls. Thus far, the calibration curve obtained fro

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Muzikar, Paul. "Radiocarbon Calibration by the Date Distribution Method." Radiocarbon 41, no. 2 (1999): 215–20. http://dx.doi.org/10.1017/s003382220001955x.

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A method is presented for calibrating radiocarbon ages based on statistical analysis of a large number of randomly distributed dates. One interesting feature of this method is that it is internal; that is, it allows one to extend a known calibration curve further back in time by using only 14C dates, with no reference to any other dating technique. A serious difficulty in implementing this method lies in assembling a sample of dates with the correct statistical properties.

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Polgar, Janos, Jack Havelick, Qun Li, et al. "Optimization of One-Stage Coagulation Factor Assays: Improved Accuracy and Precision over an Extended Linear Range." Blood 110, no. 11 (2007): 3933. http://dx.doi.org/10.1182/blood.v110.11.3933.3933.

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Abstract The majority of clinical laboratories use the one stage factor assay for plasma factor measurements because it is simple and easy to automate. However, quality assessment scheme surveys on factors show that inter-laboratory agreement needs to be improved and the one stage assay needs to be standardized better. In this study, one stage factor assays were improved by optimizing assay calibrations. A serious drawback of current factor assay calibrations is that they can’t cover the clinically relevant range (from zero to high activities) by a reliable single calibration. To have measured

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Tani, Hidenori, Takahiro Kanagawa, Nao Morita, et al. "Calibration-curve-free quantitative PCR: A quantitative method for specific nucleic acid sequences without using calibration curves." Analytical Biochemistry 369, no. 1 (2007): 105–11. http://dx.doi.org/10.1016/j.ab.2007.06.047.

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Aguilar, Delil Gómez Portugal, Cliff D. Litton, and Anthony O'Hagan. "Novel Statistical Model for a Piece-Wise Linear Radiocarbon Calibration Curve." Radiocarbon 44, no. 1 (2002): 195–212. http://dx.doi.org/10.1017/s0033822200064791.

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The process of calibrating radiocarbon determinations onto the calendar scale requires the setting of a specific statistical model for the calibration curve. This model specification will bear fundamental importance for the resulting inference regarding the parameter of interest—namely, in general, the calendar age associated to the sample that has been 14C-dated.Traditionally, the 14C calibration curve has been modelled simply as the piece-wise linear curve joining the (internationally agreed) high-precision calibration data points; or, less frequently, by proposing spline functions in order

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Mikhaylovskaya, Zoya A., Elena S. Buyanova, and Denis Yu Smirnov. "Determination of Bi in complex oxide samples by atomic absorption spectrometry by using ordinary acetylene – air flame atomization." Chimica Techno Acta 6, no. 4 (2019): 138–46. http://dx.doi.org/10.15826/chimtech.2019.6.4.03.

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In the present work the air/acetylene flame atomic absorption spectrometry was used for bismuth determination in complex oxides. Interference studies were carried out, and interference with vanadium and molybdenum was detected. The method of standard additions and traditional calibration curve method were used. Calibration and standard addition curves were fitted with linear and polynomial functions. It was shown that using polynomial function gives better results for the standard additions method for determination of bismuth by acetylene/air flame atomic absorption spectrometry. The calibrati

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Svetlik, I., A. J. T. Jull, M. Molnár, et al. "The Best possible Time resolution: How precise could a Radiocarbon dating method be?" Radiocarbon 61, no. 6 (2019): 1729–40. http://dx.doi.org/10.1017/rdc.2019.134.

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ABSTRACTToday, accelerator mass spectrometry (AMS) technology enables us to carry out very precise measurements of radiocarbon (14C). Unfortunately, due to fluctuations in the 14C calibration curve, the resulting calibrated time intervals vary from decades up to centuries in calibrated age. Within a time scale of several decades, we can find several time intervals on the 14C calibration curve which correspond with periods of rapid increases in atmospheric 14CO2 activity. Some of these “high slope” parts of the calibration curve could be used for fine time resolution for radiocarbon dating of i

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Masdor, Noor Azlina. "Detection Limit of the Four-Parameter Logistic Model for the Quantitative Detection of Serum Squamous Cell Carcinoma Antigenin Cervical Cancer Based on Surface Plasmon Resonance Biosensor." Journal of Environmental Microbiology and Toxicology 9, no. 2 (2021): 30–32. http://dx.doi.org/10.54987/jemat.v9i2.644.

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Biochemical diagnostic procedures, such as protein binding, rely on biomolecular interactions as its diagnostic modality, and as a consequence, their calibration curves are more complex. In addition, sigmoidal curves are often seen in these tests. In the event of asymmetry, a logistic (5PL) curve, or a logistic (4PL) curve, may be the best way to represent a distinctive sigmoidal relationship. It is possible that the linearization of an otherwise nonlinear connection by log transformation may result in a disruption of the error structure of the curve, and that this will have the opposite effec

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Sadatsafavi, Mohsen, Paramita Saha-Chaudhuri, and John Petkau. "Model-Based ROC Curve: Examining the Effect of Case Mix and Model Calibration on the ROC Plot." Medical Decision Making 42, no. 4 (2021): 487–99. http://dx.doi.org/10.1177/0272989x211050909.

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Background The performance of risk prediction models is often characterized in terms of discrimination and calibration. The receiver-operating characteristic (ROC) curve is widely used for evaluating model discrimination. However, when comparing ROC curves across different samples, the effect of case mix makes the interpretation of discrepancies difficult. Further, compared with model discrimination, evaluating model calibration has not received the same level of attention. Current methods for examining model calibration require specification of smoothing or grouping factors. Methods We introd

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Kitagawa, Hiroyuki, and Johannes Van Der Plicht. "A 40,000-Year Varve Chronology from Lake Suigetsu, Japan: Extension of the 14C Calibration Curve." Radiocarbon 40, no. 1 (1997): 505–15. http://dx.doi.org/10.1017/s0033822200018385.

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A sequence of annually laminated sediments is a potential tool for calibrating the radiocarbon time scale beyond the range of the absolute tree-ring calibration (11 ka). We performed accelerator mass spectrometric (AMS) 14C measurements on >250 terrestrial macrofossil samples from a 40,000-yr varve sequence from Lake Suigetsu, Japan. The results yield the first calibration curve for the total range of the 14C dating method.

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Purwana, Yusep Muslih. "LABORATORY WORK ON TOTAL SUCTION CALIBRATION CURVE FOR WHATMAN #42 FILTER PAPER." Jurnal Riset Rekayasa Sipil 1, no. 1 (2017): 16. http://dx.doi.org/10.20961/jrrs.v1i1.14708.

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<p>Soil suction is one of main parameter in unsaturated soil mechanics as its measurement is as very important as pore water pressure measurement for effective stress concept in saturated soil mechanics.Basically, the measurement of soil suction can be classified into 2 categories; direct and indirect method. In the first method, negative pore water pressure is measured directly to obtain matric suction, whereas in indirect method, suction is obtained indirectly by using salt solution and censor. Calibration is then required to establish the relationship between concentration of salt sol

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Hogg, Alan, Christopher Bronk Ramsey, Chris Turney, and Jonathan Palmer. "Bayesian Evaluation of the Southern Hemisphere Radiocarbon Offset during the Holocene." Radiocarbon 51, no. 4 (2009): 1165–76. http://dx.doi.org/10.1017/s0033822200034226.

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While an interhemispheric offset in atmospheric radiocarbon levels from AD 1950–950 is now well established, its existence earlier in the Holocene is less clear, with some studies reporting globally uniform 14C levels while others finding Southern Hemisphere samples older by a few decades. In this paper, we present a method for wiggle-matching Southern Hemisphere data sets against Northern Hemisphere curves, using the Bayesian calibration program OxCal 4.1 with the Reservoir Offset function accommodating a potential interhemispheric offset. The accuracy and robustness of this approach is confi

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Ghazanfari, Amir, and Ahmad Assempour. "A New Calibration Method for FLCs in the M-K Frame-Work." Advanced Materials Research 341-342 (September 2011): 426–31. http://dx.doi.org/10.4028/www.scientific.net/amr.341-342.426.

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The main drawback of the method proposed by Marciniak and Kuczynski for prediction of the limit strains in sheet metal forming processes is requirement of an experimental point of the forming limit curve (FLC) in order to calibrate the curve. The purpose of this work is to introduce a new method to calibrate the FLC using the M-K model in which no experimental data is needed. To achieve this goal, many experimental FLCs were collected from the literature and the values of the initial inhomogeneity factors were determined for them with trial and error aproach. Using these data, an empirical law

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LaCoste, Lucien. "A new calibration method for gravity meters." GEOPHYSICS 56, no. 5 (1991): 701–4. http://dx.doi.org/10.1190/1.1443088.

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Current calibration methods give gravity meter accuracies of 3 to 5 μGal [Formula: see text] over 10 mGal intervals. The new calibration method should extend the accuracies to 100 mGal intervals. The new method nulls with both a micrometer screw and an electrostatic feedback nuller. The screw is calibrated and used only at discrete points and the electrostatic nuller completes the nulling to obtain gravity readings. Determining the calibration curve itself rather than measuring and integrating calibration (interval) factors avoids approximations. Circular errors (periods of the order of a turn

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Brien, William F., Linda Crawford, Anne Raby, and Harold Richardson. "In-house Calibration of the International Sensitivity Index or Calibration Curve for Determination of the International Normalized Ratio." Archives of Pathology & Laboratory Medicine 128, no. 3 (2004): 308–12. http://dx.doi.org/10.5858/2004-128-308-icotis.

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Abstract Context.—The international normalized ratio (INR) has been used since 1983 to standardize prothrombin time results for patients on oral anticoagulants. However, significant interlaboratory variations have been noted. Attempts have been made to address these differences with the use of instrument-specific International Sensitivity Index (ISI) values and in-house calibration of ISI values. Objective.—To assess the performance of laboratories using a calibration curve for INR testing. Design.—Attempts to improve performance of the INR include the use of instrument-specific ISI values, mo

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Mirrezaei, Ehsan, Saeed Setayeshi, Farideh Zakeri, and Samaneh Baradaran. "CONSTRUCTION AND VALIDATION OF IN VITRO DOSE–RESPONSE CALIBRATION CURVE USING DICENTRIC CHROMOSOME ABERRATION." Radiation Protection Dosimetry 189, no. 2 (2020): 198–204. http://dx.doi.org/10.1093/rpd/ncaa031.

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Abstract Cytogenetic biodosimetry is a well-known method for quantifying the absorbed dose based on measuring biological radiation effects. To correlate the induced chromosomal abberrations with the absorbed dose of the individuals, a reliable dose–response calibration curve should be established. This study aimed to use frequencies and distributions of radiation-induced dicentric chromosome aberrations to develop a standard dose–response calibration curve. Peripheral blood samples taken from six male donors irradiated by an X-ray generator up to 4 Gy were studied. Three different blood sample

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Hulsman, Petra, Thom A. Bogaard, and Hubert H. G. Savenije. "Rainfall-runoff modelling using river-stage time series in the absence of reliable discharge information: a case study in the semi-arid Mara River basin." Hydrology and Earth System Sciences 22, no. 10 (2018): 5081–95. http://dx.doi.org/10.5194/hess-22-5081-2018.

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Abstract. Hydrological models play an important role in water resources management. These models generally rely on discharge data for calibration. Discharge time series are normally derived from observed water levels by using a rating curve. However, this method suffers from many uncertainties due to insufficient observations, inadequate rating curve fitting procedures, rating curve extrapolation, and temporal changes in the river geometry. Unfortunately, this problem is prominent in many African river basins. In this study, an alternative calibration method is presented using water-level time

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Olson, Matthew T., Autumn Breaud, Robert Harlan, et al. "Alternative Calibration Strategies for the Clinical Laboratory: Application to Nortriptyline Therapeutic Drug Monitoring." Clinical Chemistry 59, no. 6 (2013): 920–27. http://dx.doi.org/10.1373/clinchem.2012.194639.

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BACKGROUND The addition of a calibration curve with every run is both time-consuming and expensive for clinical mass spectrometry assays. We present alternative calibration strategies that eliminate the need for a calibration curve except as required by laboratory regulations. METHODS We measured serum nortriptyline concentrations prospectively in 68 patients on 16 days over a 2-month period using a method employing calibration schemes that relied on the measurement of the response ratio (RR) corrected by the response factor (RF), i.e., a measurement of the RR for an equimolar mixture of the a

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Zeller, N., F. Quint, and U. Stilla. "Calibration and accuracy analysis of a focused plenoptic camera." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences II-3 (August 7, 2014): 205–12. http://dx.doi.org/10.5194/isprsannals-ii-3-205-2014.

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In this article we introduce new methods for the calibration of depth images from focused plenoptic cameras and validate the results. We start with a brief description of the concept of a focused plenoptic camera and how from the recorded raw image a depth map can be estimated. For this camera, an analytical expression of the depth accuracy is derived for the first time. In the main part of the paper, methods to calibrate a focused plenoptic camera are developed and evaluated. The optical imaging process is calibrated by using a method which is already known from the calibration of traditional

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Cheruparambil, K. R., B. Farouk, J. E. Yehoda, and N. A. Macken. "Thermal Conductivity Measurement of CVD Diamond Films Using a Modified Thermal Comparator Method." Journal of Heat Transfer 122, no. 4 (2000): 808–16. http://dx.doi.org/10.1115/1.1318206.

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Results from an experimental study on the rapid measurement of thermal conductivity of chemical vapor deposited (CVD) diamond films are presented. The classical thermal comparator method has been used successfully in the past for the measurement of thermal conductivity of bulk materials having high values of thermal resistance. Using samples of known thermal conductivity, a calibration curve is prepared. With this calibration curve, the comparator can be used to determine thermal conductivity of unknown samples. We have significantly modified and extended this technique for the measurement of

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Vásquez-Nogal, Ismael, and Christian E. Hernández-Mendoza. "Evaluation of the Soil–Water Retention Curve of Arsenic-Contaminated Soil by the Filter Paper Method." Applied Sciences 12, no. 5 (2022): 2610. http://dx.doi.org/10.3390/app12052610.

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Arsenic is a metalloid frequently found in contaminated sites due to its easy mobilization in the environment. This has attracted the researchers who have studied this phenomenon from an environmental engineering perspective. Although there is evidence indicating that soil contamination impacts its geotechnical behavior, there is no available information about the changes in the soil’s suction after its contamination. The objective of this paper was to evaluate the soil–water retention curve of arsenic-contaminated soil. An unsaturated soil sample was contaminated with arsenic at two different

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Bor, Mustafa Vakur, Boe Sandahl Sørensen, Paul Rammer, and Ebba Nexø. "Calibrated user-friendly reverse transcriptase-PCR assay: quantitation of epidermal growth factor receptor mRNA." Clinical Chemistry 44, no. 6 (1998): 1154–60. http://dx.doi.org/10.1093/clinchem/44.6.1154.

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Abstract We report a competitive reverse transcriptase-PCR (RT-PCR) assay and a calibrated user-friendly RT-PCR assay (CURT-PCR) for epidermal growth factor receptor (EGFR) mRNA. A calibrator was prepared from isolated rat liver RNA, and the amount of EGFR mRNA was determined by competitive RT-PCR. In CURT-PCR, a calibration curve was developed by plotting the ratio between the amount of PCR product originating from the calibrator and the RNA internal standard vs the amount of EGFR mRNA present in the calibrator. A fixed amount of RNA internal standard was coamplified with the EGFR mRNA presen

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Walanus, Adam. "Systematic Bias of Radiocarbon Method." Radiocarbon 51, no. 2 (2009): 433–36. http://dx.doi.org/10.1017/s003382220005582x.

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Systematic bias of dates can became statistically significant regarding the growing global number of dates connected with the calibration curve plateau. For example, samples of true age in the span 800–700 BC are dated to be roughly 100 younger, on average. The curve of expected bias for a given age is presented. To avoid such a bias, the Bayesian paradigm probably must be modified in some way.

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Wang, Ningming, and Shuhua Wang. "A calibration data curve fitting method based on matrix orthogonal triangulation." Procedia Computer Science 174 (2020): 89–94. http://dx.doi.org/10.1016/j.procs.2020.06.061.

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Liu, Wenlei, Sentang Wu, Xiaolong Wu, and Hongbo Zhao. "Calibration Method Based on the Image of the Absolute Quadratic Curve." IEEE Access 7 (2019): 29856–68. http://dx.doi.org/10.1109/access.2019.2893660.

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Wieczorek, Marcin, Marek Dębosz, and Paweł Kościelniak. "Elimination of additive interference effects by H-point calibration curve method." Monatshefte für Chemie - Chemical Monthly 150, no. 9 (2019): 1563–67. http://dx.doi.org/10.1007/s00706-019-2362-8.

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Heaton, T. J., P. G. Blackwell, and C. E. Buck. "A Bayesian Approach to the Estimation of Radiocarbon Calibration Curves: The IntCal09 Methodology." Radiocarbon 51, no. 4 (2009): 1151–64. http://dx.doi.org/10.1017/s0033822200034214.

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This article presents a new approach to the construction of radiocarbon calibration curves. The Bayesian methodology was developed specifically to facilitate construction of the 2009 updates to the internationally agreed 14C calibration curves known as IntCal09 and Marine09. The curve estimation approach taken uses Markov chain Monte Carlo sampling, specifically a Metropolis-within-Gibbs sampler, which offers improved flexibility and reliability over the approaches used in the past. In particular, the method allows accurate modeling of calibration data with 14C determinations that arise from m

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Dias, Luanna Costa, Lindemberg Lima Fernandes, and David Franco Lopes. "Elaboração e Extrapolação de Curvas-chave na Região Amazônica." Revista Brasileira de Geografia Física 12, no. 6 (2020): 2285. http://dx.doi.org/10.26848/rbgf.v12.6.p2285-2301.

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O estudo consiste na elaboração e extrapolação de curvas-chave localizadas na Região Amazônica. A elevada disponibilidade hídrica da Região requer hidrogramas precisos para gestão dos Recursos Hídricos. Foram escolhidas cinco estações, com período de dados de 1971 a 2015 e o uso de 463 medições de descarga, para elaboração de curvas-chave do tipo potência e relacionando “cota x vazão” empregando duas formas de calibração: utilização do programa GrafChav e da ferramenta Solver do Excel, tendo o coeficiente de Nash-Sutcliffe (NS) como validação. A extrapolação foi realizada pelos métodos: Logarí

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Hu, Bing, and Xi Jun Liu. "Design and Research of Multi-Channel Temperature Calibration System Based on the LabVIEW." Advanced Materials Research 304 (July 2011): 241–46. http://dx.doi.org/10.4028/www.scientific.net/amr.304.241.

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According to industry and agriculture domain which applied temperature sensor need calibration. It is proposed the temperature calibration system design which based on the environmental of the LabVIEW programming to complete the parameter calibration and characteristics analysis of temperature sensor. The design communicates to serial bus by VISA programming interface to complete setting the temperature of the FLUKE9171 temperature calibrator, and get the temperature informations of the Multi-channel DS18B20 temperature sensor. It demarcates the collected data by using the method of the curve

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Kotzianova, Adela, Jiri Rebicek, Ondrej Zidek, Marek Pokorny, Jan Hrbac, and Vladimir Velebny. "Raman spectroscopy based method for the evaluation of compositional consistency of nanofibrous layers." Analytical Methods 7, no. 23 (2015): 9900–9905. http://dx.doi.org/10.1039/c5ay02671g.

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Analysis of the nanofibers based on Raman spectroscopy and singular value decomposition is presented. The calibration of results is included and local homogeneity of samples is shown through Raman maps. SVD results after and before calibration curve application and recalculation to percents.

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Zhou, M., L. S. Chen, J. H. Wang, et al. "ANALYSIS OF INFLUENCING FACTORS OF CURVE MATCHING BASED GEOMETRIC CALIBRATION FOR ZY3-02 ALTIMETER DATA." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences IV-2/W7 (September 16, 2019): 221–26. http://dx.doi.org/10.5194/isprs-annals-iv-2-w7-221-2019.

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<p><strong>Abstract.</strong> High-precision on-orbit geometric calibration of spaceborne laser altimetry data is essential to its effective applications. Firstly, the existing calibration methods for laser altimeter data are analyzed. Then, a geometric calibration method based on curve matching is proposed. Compared to the existing methods, the proposed method does not rely on ground calibration field. Thus, it is efficiency in expense and time. Notably, three factors, i.e. matching method, initial control point selection and the step size of matching step, which significant

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Knox, F. B., and B. G. McFadgen. "Least-Squares Fitting A Smooth Curve to Radiocarbon Calibration Data." Radiocarbon 39, no. 2 (1997): 193–204. http://dx.doi.org/10.1017/s0033822200052000.

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We Fourier transformed and filtered calibration curve data to compensate for the averaging effect of radiocarbon-dating sets of adjacent tree rings. A Wiener Filter was also applied to minimize the effects of the counting errors of the dates on the resulting calibration curve and to produce a least-squares curve through the data. The method is illustrated using a short 14C-dated tree-ring sequence from New Zealand to produce a calibration curve at yearly intervals for New Zealand matai (Prumnopitys taxifolia). The resulting curve has a nominal standard error of 10 ± 3 yr, which is ca. half the

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McGwire, Kenneth C., Kendrick C. Taylor, John R. Banta, and Joseph R. McConnell. "Identifying annual peaks in dielectric profiles with a selection curve." Journal of Glaciology 57, no. 204 (2011): 763–69. http://dx.doi.org/10.3189/002214311797409721.

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AbstractA novel ‘selection curve’ method is developed to interpret annual layers in the West Antarctic ice sheet (WAIS) Divide ice core based on dielectric properties (DEP). Because dielectric measurements are non-contact and represent the integrated response of the ice volume, they are particularly useful for the brittle zone of the core. Seasonal differences in ice chemistry create an annual signal in DEP, though multiple peaks of varying strength within a year may complicate the interpretation of annual layers. The selection curve algorithm uses a spline curve whose shape selects successive

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Johnston, Marilyn, and Dorothy Adcock. "Evaluation of Frozen Plasma Calibrants for Enhanced Standardization of the International Normalized Ratio (INR): A Multi-Center Study." Thrombosis and Haemostasis 87, no. 01 (2002): 74–79. http://dx.doi.org/10.1055/s-0037-1612946.

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SummaryLocal ISI calibration has been proposed to improve INR accuracy and inter-laboratory precision. We evaluated the affect of local PT calibration on INR precision and accuracy using six levels of frozen plasma calibrants prepared and pooled from normal donors and patients stabilized on sodium warfarin (coumarin) based oral anticoagulant therapy (OAT). Reference prothrombin time (PT) and INR values were assigned to these calibrants in accordance with World Health Organization (WHO) procedure using rTF 95 international reference preparation (IRP) of thromboplastin (human recombinant). These

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Yuzefovsky, Alexander I., Robert F. Lonardo, Jack X. Zhou, and Robert G. Michel. "Newton Method of Successive Approximations for the Linearization of the Calibration Curves of Chromium, Copper, Lead, Manganese, Silver, and Thallium in Zeeman Graphite Furnace Atomic Absorption Spectrometry." Applied Spectroscopy 51, no. 5 (1997): 738–43. http://dx.doi.org/10.1366/0003702971940918.

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A new approach for the linearization of calibration curves in graphite furnace atomic absorption spectrometry (GFAAS) with Zeeman background correction was tested experimentally in an intermediate concentration region before rollover. The computational procedure employed the Newton method of successive approximations and was based on the theoretical model of L'vov et al. The calculations were based on three measured parameters: the rollover absorbance, Ar; the sensitivity ratio at the rollover point, R′; and the original background-corrected peak absorbances Az. This computational procedure ge

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Anisko, Tomasz, D. Scott NeSmith, and Orville M. Lindstrom. "Time-domain Reflectometry for Measuring Water Content of Organic Growing Media in Containers." HortScience 29, no. 12 (1994): 1511–13. http://dx.doi.org/10.21273/hortsci.29.12.1511.

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The time-domain reflectometry (TDR) method of measuring water content has been applied to mineral soils but not to organic growing media. We investigated the applicability of TDR for measuring the water content of organic media in containers. TDR calibration was conducted for sand, peat, composted pine bark, sand and peat mix, sand and bark mix, and a commercial growing medium (Metro Mix 300). Regression analysis of volumetric water content was conducted with the ratio of apparent: physical length of the probe (La: L) as an independent variable. The calibration curve for Metro Mix 300 was comp

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Ziglio, G., G. Andreottola, P. Foladori, and M. Ragazzi. "Experimental validation of a single-OUR method for wastewater RBCOD characterisation." Water Science and Technology 43, no. 11 (2001): 119–26. http://dx.doi.org/10.2166/wst.2001.0674.

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Wastewater characterisation is of primary importance for the correct design and management of a treatment plant. The aim of this work was the evaluation of a new rapid and easy to use respirometric technique for the characterisation of readily biodegradable COD (RBCOD). When the necessary calibration curve is obtained, the RBCOD assessment procedure needs less than 30 minutes. On the contrary, conventional techniques require some hours. The first step consists in calculating a calibration curve in order to point out the correlation between oxygen consumed and known amount of added Sodium Aceta

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Prasad, Neelkant, Roshan Issarani, and Badri Prakash Nagori. "Ultraviolet Spectrophotometric Method for Determination of Glipizide in Presence of Liposomal/Proliposomal Turbidity." Journal of Spectroscopy 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/836372.

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A simple and sensitive ultraviolet spectrophotometric method for quantitative estimation of glipizide in presence of lipid turbidity is described to avoid false estimation due to diffraction by turbidity. UV detection was performed at 230 nm, 225 nm, and 235 nm, and the calibration curve was plotted between resultant of absorbance of [230 nm − (225 nm + 235 nm)/2] and concentration of analyte. The calibration curve was linear over the concentration range tested (1–20 μg/mL) with limit of detection of 0.27 μg/mL and limit of quantification of 0.82 μg/mL. Percent relative standard deviations and

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Sidorenko, Juri, Volker Schatz, Norbert Scherer-Negenborn, Michael Arens, and Urs Hugentobler. "Decawave UWB Clock Drift Correction and Power Self-Calibration." Sensors 19, no. 13 (2019): 2942. http://dx.doi.org/10.3390/s19132942.

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The position accuracy based on Decawave Ultra-Wideband (UWB) is affected mainly by three factors: hardware delays, clock drift, and signal power. This article discusses the last two factors. The general approach to clock drift correction uses the phase-locked loop (PLL) integrator, which we show is subject to signal power variations, and therefore, is less suitable for clock drift correction. The general approach to the estimation of signal power correction curves requires additional measurement equipment. This article presents a new method for obtaining the curve without additional hardware a

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Hashii, Noritaka, Yoshiko Tousaka, Koji Arai, et al. "Generic MS-based method for the bioanalysis of therapeutic monoclonal antibodies in nonclinical studies." Bioanalysis 12, no. 4 (2020): 231–43. http://dx.doi.org/10.4155/bio-2019-0253.

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Aim: A generic bioanalytical method was developed to quantify therapeutic IgG1 monoclonal antibodies (mAbs) in mouse sera by combining an easy sample preparation method with LC/MS using selected reaction monitoring. Materials & methods: Rituximab and trastuzumab were used as model mAbs. A synthetic stable isotope-labeled peptide or a stable isotope-labeled mAb was used as an internal standard. The method feasibility was evaluated by a collaborative study involving six laboratories. Results: The calibration curve ranged from 1.0 to 1000.0 μg/ml (correlation coefficient >0.99). The valida

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Sumner, David. "A Comparison of Data-Reduction Methods for a Seven-Hole Probe." Journal of Fluids Engineering 124, no. 2 (2002): 523–27. http://dx.doi.org/10.1115/1.1455033.

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Two data-reduction methods were compared for the calibration of a seven-hole conical pressure probe in incompressible flow. The polynomial curve-fit method of Gallington and the direct-interpolation method of Zilliac were applied to the same set of calibration data, for a range of calibration grid spacings. The results showed that the choice of data-reduction method and the choice of calibration grid spacing each have an influence on the measurement uncertainty. At high flow angles, greater than 30 deg, where flow may separate from the leeward side of the probe, the direct-interpolation method

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Schlain, Brian. "A stochastic approximation method for assigning values to calibrators." Clinical Chemistry 44, no. 4 (1998): 839–48. http://dx.doi.org/10.1093/clinchem/44.4.839.

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Abstract A new procedure is provided for transferring analyte concentration values from a reference material to production calibrators. This method is robust to calibration curve-fitting errors and can be accomplished using only one instrument and one set of reagents. An easily implemented stochastic approximation algorithm iteratively finds the appropriate analyte level of a standard prepared from a reference material that will yield the same average signal response as the new production calibrator. Alternatively, a production bulk calibrator material can be iteratively adjusted to give the s

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Reimer, Paula J. "Composition and consequences of the IntCal20 radiocarbon calibration curve." Quaternary Research 96 (June 15, 2020): 22–27. http://dx.doi.org/10.1017/qua.2020.42.

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AbstractRadiocarbon calibration is necessary to correct for variations in atmospheric radiocarbon over time. The IntCal working group has developed an updated and extended radiocarbon calibration curve, IntCal20, for Northern Hemisphere terrestrial samples from 0 to 55,000 cal yr BP. This paper summarizes the new datasets, changes to existing datasets, and the statistical method used for constructing the new curve. Examples of the effect of the new calibration curve compared to IntCal13 for hypothetical radiocarbon ages are given. For the recent Holocene the effect is minimal, but for older ra

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Budinich, Marco, and Renato Frison. "Adaptive Calibration of Imaging Array Detectors." Neural Computation 11, no. 6 (1999): 1281–96. http://dx.doi.org/10.1162/089976699300016241.

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We present two methods for nonuniformity correction of imaging array detectors based on neural networks; both exploit image properties to supply lack of calibrations and maximize the entropy of the output. The first method uses a self-organizing net that produces a linear correction of the raw data with coefficients that adapt continuously. The second method employs a kind of contrast equalization curve to match pixel distributions. Our work originates from silicon detectors, but the treatment is general enough to be applicable to many kinds of array detectors like those used in infrared imagi

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Perrone, J., and C. A. Madramootoo. "Improved curve number selection for runoff prediction." Canadian Journal of Civil Engineering 25, no. 4 (1998): 728–34. http://dx.doi.org/10.1139/l98-007.

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The three antecedent moisture conditions used in the SCS (Soil Conservation Service) curve number method of surface runoff volume prediction have been shown to be inapplicable in humid regions such as the Ottawa - St. Lawrence Lowlands. The antecedent precipitation index is an alternative indicator of soil moisture. Using a hydrologic database, calibration curves were developed to correlate antecedent precipitation index to the SCS curve number. Curve numbers were then input to the AGNPS hydrologic model. When compared to the three antecedent moisture conditions in the SCS curve number method,

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