Feasibility of quality process control of a naphtha fractioning unit based on near-infrared spectroscopic prediction of physical and chemical properties of medium naphtha streams

2007 ◽  
Vol 44 (1) ◽  
pp. 187-191 ◽  
Author(s):  
Marcio V. Reboucas ◽  
Edson C. Santos ◽  
Fernanda S.V. Vieira
Keyword(s):  
Process Control ◽  
Near Infrared ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Infrared Spectroscopic ◽  
Physical And Chemical ◽  
Quality Process ◽  
And Chemical Properties

Simultaneous Determination of Physical and Chemical Properties of Sodium Chloride Solutions by near Infrared Spectroscopy

1993 ◽  
Vol 1 (2) ◽  
pp. 109-120 ◽  
Author(s):  
Jie Lin ◽  
Chris W. Brown
Keyword(s):  
Simultaneous Determination ◽  
Near Infrared ◽  
Chemical Properties ◽  
Nir Spectroscopy ◽  
Physical And Chemical Properties ◽  
Fibre Optic Probe ◽  
Optic Probe ◽  
Physical And Chemical ◽  
And Chemical Properties

Near infrared (NIR) spectroscopy has been investigated as a new technique for the simultaneous determination of physical and chemical properties of NaCl solutions. The spectra of NaCl solutions (0 to 5 M) were measured with cuvettes in the 1100–2500 nm and 680–1230 nm regions at temperatures between 23.0 and 28.5°C, and with a fibre-optic probe in the 1100–1870 nm region at room temperature (23.0 ± 0.5°C). These spectra were correlated with various properties of NaCl solutions by principal component regression (PCR) and multilinear regression (MLR) models. The properties studied include water concentration, density, refractive index, relative viscosity, freezing point depression, osmolality, electrical conductance and activity coefficient of NaCl. Very good correlations were found between the NIR predicted values and literature values. The results of this study demonstrate that several properties of NaCl solutions can be determined simultaneously with NIR spectroscopy. Remote sensing of the properties can be performed with the use of a fibre-optic probe.

Statistical criteria of stellar population types

1966 ◽  
Vol 24 ◽  
pp. 101-110
Author(s):  
W. Iwanowska
Keyword(s):  
Stellar Population ◽  
Chemical Properties ◽  
Spectrophotometric Study ◽  
Physical And Chemical Properties ◽  
Population Type ◽  
The Galaxy ◽  
Distribution Parameters ◽  
Physical And Chemical ◽  
Statistical Criteria ◽  
And Chemical Properties

In connection with the spectrophotometric study of population-type characteristics of various kinds of stars, a statistical analysis of kinematical and distribution parameters of the same stars is performed at the Toruń Observatory. This has a twofold purpose: first, to provide a practical guide in selecting stars for observing programmes, second, to contribute to the understanding of relations existing between the physical and chemical properties of stars and their kinematics and distribution in the Galaxy.

Response of corn (Zea mays L.) to various organic-based fertilizers in marginal upland of Sta. Rita, Samar

2017 ◽  
pp. 31-43
Author(s):  
Berta Ratilla ◽  
Loreme Cagande ◽  
Othello Capuno
Keyword(s):  
Block Design ◽  
Management Strategies ◽  
Chemical Properties ◽  
Organic Fertilizers ◽  
Growth And Yield ◽  
Physical And Chemical Properties ◽  
Total N ◽  
Randomized Complete Block Design ◽  
Physical And Chemical ◽  
And Chemical Properties

Organic farming is one of the management strategies that improve productivity of marginal uplands. The study aimed to: (1) evaluate effects of various organic-based fertilizers on the growth and yield of corn; (2) determine the appropriate combination for optimum yield; and (3) assess changes on the soil physical and chemical properties. Experiment was laid out in Randomized Complete Block Design, with 3 replications and 7 treatments, namely; T0=(0-0-0); T1=1t ha-1 Evans + 45-30-30kg N, P2O5, K2O ha-1; T2=t ha-1 Wellgrow + 45-30-30kg N, P2O5, K2O ha-1; T3=15t ha-1 chicken dung; T4=10t ha-1 chicken dung + 45-30-30kg N, P2O5, K2O ha-1; T5=15t ha-1 Vermicast; and T6=10t ha-1 Vermicast + 45-30-30kg N, P2O5, K2O ha-1. Application of organic-based fertilizers with or without inorganic fertilizers promoted growth of corn than the control. But due to high infestation of corn silk beetle(Monolepta bifasciata Horns), its grain yield was greatly affected. In the second cropping, except for Evans, any of these fertilizers applied alone or combined with 45-30-30kg N, P2O5, K2O ha-1 appeared appropriate in increasing corn earyield. Soil physical and chemical properties changed with addition of organic fertilizers. While bulk density decreased irrespective of treatments, pH, total N, available P and exchangeable K generally increased more with chicken dung application.

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