Results 231 to 240 of about 722,741 (282)

Kinetics and mechanism of kappa number determination

Nordic Pulp & Paper Research Journal, 1998
The kinetics and mechanism involved in the kappa number determination have been studied using a spectrophotometric method to monitor the oxidation of pine kraft pulp as well as of model compounds f ...
Jiebing Li, Göran Gellerstedt
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PREDICTION AND CONTROL OF BLOW-LINE KAPPA NUMBER

IFAC Proceedings Volumes, 2005
Abstract Two industrial continuous cooking processes producing both softwood and hardwood pulp were studied. Real time kappa number profiles of conventional and Downflow Lo-Solids cooking were modelled. Gustafson's kappa number model with optimised parameters was used. Blow-line kappa numbers were successfully predicted before cooking zone. New kappa
Rami Rantanen, Timo Ahvenlampi, Manne Tervaskanto, Urpo Kortela, Aki Korhonen   +4 more
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Dependence of Weighted Kappa Coefficients on the Number of Categories

Epidemiology, 1996
Weighted kappa coefficients are commonly used to quantify inter- or intra-rater reliability or test-retest reliability of ordinal ratings in clinical and epidemiologic applications. In this paper, we assess the dependence of weighted kappa coefficients on the number of categories and the type of weighting scheme, which vary between applications.
H, Brenner, U, Kliebsch
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On the structural significance of the kappa number measurement

Nordic Pulp & Paper Research Journal, 1998
The structural significance of a kappa number has been studied by quantifying the permanganate consumption of various isolated pine, birch and poplar lignins, of lignin model compounds and of carbo ...
Jiebing Li, Göran Gellerstedt
openaire   +1 more source

Initial estimates for certain subclasses of bi-univalent functions with $$\kappa $$-Fibonacci numbers

Afrika Matematika, 2023
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Nanjundan Magesh, Jodalli Nirmala, Jagadeesan Yamini, Sondekola Rudra Swamy   +3 more
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Enhancing Controllability of Kappa Number Using Gray-Box Modeling

IFAC Proceedings Volumes, 2004
Abstract In industrial digester control systems Kappa number models are often used. There are publications using both physical and experimental methods. In this study Kappa number is predicted in the top of the digester using both modelling techniques.
Timo Ahvenlampi, Rami Rantanen, Manne Tervaskanto, Urpo Kortela   +3 more
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Oxygen Delignification of Bamboo Kraft Pulp with High Kappa Number

Advanced Materials Research, 2011
Bamboo kraft pulp with Kappa number of 25.6 was sampled, and oxygen delignification was applied to bleach these bamboo pulp samples. By investigating yield, Kappa number, viscosity, brightness of pulp, and delignification selectivity, it has been proven that caustic soda dosage and reaction temperature were major factors for oxygen delignification. The
Hui Gao, Huai Yu Zhan
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Monitoring the kappa number of bleached pulps based on FT-Raman spectroscopy

Cellulose, 2021
A new strategy was proposed to determine the Kappa number of bleached Eucalyptus globulus kraft pulps based on FT-Raman spectroscopy. Before modeling, smoothing (Savitzky-Golay), baseline correction (air-PLS), and Gaussian fitting were executed for obtaining data, including peak intensities and areas, from the Raman spectra.
Wenli Gao, Liang Zhou, Ying Guan, Hui Gao, Shengquan Liu   +4 more
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Kappa Number Prediction of Pulp Digester Using LSTM Neural Network

2019 16th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON), 2019
A digester, one of the major units of Kraft process, has a function for conversion of wood into wood pulp. It is controlled by monitoring Kappa number with nonlinear reaction and has a long resident time. This paper aims to present the prediction of kappa number in pulp digester in advance for 1-3 hours by using Long Short-Term Memory (LSTM) neural ...
Arinchai Phatwong, Diew Koolpiruck
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Target Kappa Number for AS/AQ Pulping of Wheat Straw

Advanced Materials Research, 2011
Alkaline sulfite/anthraquinone (AS/AQ) pulping of wheat straw under different conditions was conducted in this study. A transition point of kappa number at approximately 6.5 was observed based on all experimental results. This transition point can be regarded as the phase transfer point in AS/AQ pulping from bulk to residual delignification.
Jing Liu, Katsuya Nagata
openaire   +1 more source