Measurement of Cr(VI) Based on Absorption Spectrum through Plastic Fiber

2014 ◽  
Vol 687-691 ◽  
pp. 948-951
Author(s):  
Wei Jun Hu
Keyword(s):  
Signal Processing ◽  
Absorption Spectrum ◽  
Optic Fiber ◽  
Signal Process ◽  
Linear Fitting ◽  
Non Linear ◽  
Low Pass ◽  
Measurement Experiment

Considering the advantage of optic fiber, a methods of measuring Cr (VI) based on absorption spectrum through plastic fiber is introduced, which includes structure of measurement, experiment process, spectrum signal process. After signal processing based on low-pass filtering and non-linear fitting, five concentrations of Cr (VI) can be differed easily and the peak values of spectrum corresponding to five concentrations accord with the Longbow Bill's law . In this way, the measurement concentration can limit down to 0. 0.0660 μg/ml.

scholarly journals Non-linear fitting with joint spatial regularization in Arterial Spin Labeling

2021 ◽  
pp. 102067
Author(s):  
Oliver Maier ◽  
Stefan M. Spann ◽  
Daniela Pinter ◽  
Thomas Gattringer ◽  
Nicole Hinteregger ◽  
...  
Keyword(s):  
Arterial Spin Labeling ◽  
Spin Labeling ◽  
Linear Fitting ◽  
Non Linear ◽  
Spatial Regularization

scholarly journals Kinetic, isotherm and thermodynamic studies with linear and non-linear fitting for cadmium(II) removal by black carbon of pine cone

2017 ◽  
Vol 76 (8) ◽  
pp. 2242-2253 ◽  
Author(s):  
Z. Yavari ◽  
M. Noroozifar
Keyword(s):  
Aqueous Solutions ◽  
Black Carbon ◽  
Adsorption Process ◽  
Order Kinetic ◽  
Cadmium Removal ◽  
Thermodynamic Studies ◽  
Linear Fitting ◽  
Pine Cone ◽  
Fitting Method ◽  
Non Linear

In this study, black carbon from pine cone (BCPC) and acidic-modified BCPC (MBCPC) powder as a popular agricultural waste in the southeast of Iran were used for cadmium removal from aqueous solutions. The effect of various factors, such as surface chemistry and dosage of adsorbent, contact time, size of particles, initial concentration of cadmium, temperature, and pH of aqueous solutions, was investigated. The results show cadmium removal with usage of the mentioned adsorbents increased after acidic modification. It was noteworthy in this work that the removal percentage of pollutant was above 90% for suggested biosorbents. The obtained experimental data for optimum conditions were selected to model the adsorption behavior of the materials with usage of six isotherm equations via non-linear fitting method and the residual root mean square error estimation for each model. The adsorption of cadmium preferably fitted Khan and Langmuir–Freundlich isotherms for BCPC and MBCPC adsorbents, respectively. The kinetic studies via linear fitting method proved the second-order kinetic was the applicable model for the adsorption process. Thermodynamic studies show the adsorption process of cadmium onto BCPC and MBCPC was spontaneous and endothermic.

A batch-wise non-linear fitting and analysis tool for treating large X-ray diffraction data sets

2006 ◽  
Vol 39 (2) ◽  
pp. 262-266 ◽  
Author(s):  
R. J. Davies
Keyword(s):  
Diffraction Data ◽  
Operation Mode ◽  
Large Data ◽  
Scattering Data ◽  
Data Sets ◽  
Analysis Tool ◽  
Data Set ◽  
X Ray ◽  
Linear Fitting ◽  
Non Linear

Synchrotron sources offer high-brilliance X-ray beams which are ideal for spatially and time-resolved studies. Large amounts of wide- and small-angle X-ray scattering data can now be generated rapidly, for example, during routine scanning experiments. Consequently, the analysis of the large data sets produced has become a complex and pressing issue. Even relatively simple analyses become difficult when a single data set can contain many thousands of individual diffraction patterns. This article reports on a new software application for the automated analysis of scattering intensity profiles. It is capable of batch-processing thousands of individual data files without user intervention. Diffraction data can be fitted using a combination of background functions and non-linear peak functions. To compliment the batch-wise operation mode, the software includes several specialist algorithms to ensure that the results obtained are reliable. These include peak-tracking, artefact removal, function elimination and spread-estimate fitting. Furthermore, as well as non-linear fitting, the software can calculate integrated intensities and selected orientation parameters.

Non-linear fitting-based phasor measurement method for PMU calibrator

2019 ◽  
Vol 106 ◽  
pp. 585-597 ◽  
Author(s):  
Hao Liu ◽  
Sudi Xu ◽  
Tianshu Bi ◽  
Kenneth E. Martin ◽  
Cheng Qian ◽  
...  
Keyword(s):  
Measurement Method ◽  
Linear Fitting ◽  
Phasor Measurement ◽  
Non Linear

Non Linear Fitting Methods for Machine Learning

2017 ◽  
pp. 807-818
Author(s):  
Edgar A. Martínez-García ◽  
Nancy Ávila Rodríguez ◽  
Ricardo Rodríguez-Jorge ◽  
Jolanta Mizera-Pietraszko ◽  
Jaichandar Kulandaidaasan Sheba ◽  
...  
Keyword(s):  
Machine Learning ◽  
Linear Fitting ◽  
Non Linear

Utilisation d'une ligne de microphotodiodes en spectroscopie dispersive : application à la détection du NO2

1983 ◽  
Vol 61 (2) ◽  
pp. 301-304 ◽  
Author(s):  
Jacques Bures ◽  
François Leonard ◽  
Jean-Pierre Monchalin
Keyword(s):  
Absorption Spectrum ◽  
Systematic Errors ◽  
Sufficient Information ◽  
Atmospheric Pollutant ◽  
Spatial Frequencies ◽  
Low Pass ◽  
On Line ◽  
Photodiode Array ◽  
Analysis System

A self-scanned photodiode array has been used as a multiplex sensor for laboratory detection and measurement, by dispersive spectroscopy, of trace quantities of the atmospheric pollutant NO2. The on-line data acquisition and numerical analysis system allows in particular to eliminate some systematic errors and drifts (Taylor filtering) and the noise associated with high spatial frequencies (low-pass filtering). We have then been able to show that an absorption spectrum, corresponding to low absorber concentrations, has a sufficient information content for the characterization of the pollutant and the measurement of its concentration (ppm m), even when noise and drifts are present. The proposed system can be favorably compared to the ones, based on a single photoelectric detector, which are commercially used.

The non-linear fitting method to analyze the measured M–S plots of bipolar passive films

2010 ◽  
Vol 55 (7) ◽  
pp. 2498-2504 ◽  
Author(s):  
Ruijing Jiang ◽  
Changfeng Chen ◽  
Shuqi Zheng
Keyword(s):  
Passive Films ◽  
Linear Fitting ◽  
Fitting Method ◽  
Non Linear
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