scholarly journals Time changeability model of the bog ore sorption ability

2014 ◽  
Vol 21 (1) ◽  
pp. 113-123
Author(s):  
Kazimierz Gaj ◽  
Hanna Cybulska-Szulc
Keyword(s):  
Statistical Analysis ◽  
Regression Model ◽  
Sorption Capacity ◽  
Time Variation ◽  
Iron Ore ◽  
Theoretical Calculations ◽  
Sorption Ability ◽  
Laboratory Examinations

Abstract Basing on long-standing cyclic measurements of sludge-originated biogas composition and considering statistical analysis of their results, a regression model describing time variation of biogas desulfurization using bog iron ore has been developed. The model was verified by theoretical calculations and results from laboratory examinations of the sorbent. It was also used to estimate the depletion time and sorption capacity of the bed and to determine the demand index for bog ore.

scholarly journals Computational Analysis of Biophilic Scale Distributions of Façades in Kaunas City Centre

2021 ◽  
Vol 18 ◽  
pp. 16-28
Author(s):  
Marius Ivaskevicius ◽  
Huriye Armagan Dogan
Keyword(s):  
Statistical Analysis ◽  
Linear Regression ◽  
Regression Model ◽  
Linear Regression Model ◽  
Computational Analysis ◽  
Fractal Dimensions ◽  
Health Problems ◽  
Medical Emergency ◽  
City Centre ◽  
Emotional Tension

The results of numerous studies which are performed on the concepts of Biophilic architecture demonstrate that it can influence emotional tension and health of the observers. Moreover Biophilic research exhibits that not only natural plants induce biophilic response, but also artificial, human creations with certain fractal dimensions or distributions of scales can have an impact. In that regard, the aim of this research is to describe the relation between measurable Biophilic properties of façades and the emotional tension inducing health problems measured with the count of medical emergency arrivals in the vicinity of the façades. To achieve the aim several tasks were completed, such as the development of a methodology of façade analysis, and application of it in an experiment to test the validity. The engineered features found by this research are based on statistical analysis of distributions of line lengths and distances between lines in a drawing of a façade. To test the methodology, a linear regression model with six features was trained and it achieved a 37 % confidence, measured with R² adjusted, predicting the number of medical emergency arrivals. Simplicity of the model allowed to make additional insights into the specificity of façade properties, and their importance to Biophilia, which establishes the scientific novelty and the significance of this research.

scholarly journals A Multiepoch Regression Model used in Geodesy

2016 ◽  
Vol 28 (4) ◽  
Author(s):  
Lubomír Kubáček ◽  
Ludmila Kubáčková
Keyword(s):  
Statistical Analysis ◽  
Regression Model ◽  
Practical Importance ◽  
The Other ◽  
Measurement Results ◽  
Replicated Measurements

An investigation of the deformations of large buildings (bridges, dams, etc.) needs replicated measurements in special types of geodetical networks. They are characterized by two groups of points creating the network; one group is formed by points with stable positions and the other one is formed by points located on the building and characterizing its deformations. A statistical analysis of measurement results is done after each epoch ofmeasurement and also after several epochs. It is of a practical importance to develop an algorithm of estimation which enables us to use the partial results obtained after each epoch for results after several epochs.

Dimensional Deviation Affected by Cutting Parameters and Machine Tool Rigidity in Dry Turning of S45C Steel

2013 ◽  
Vol 315 ◽  
pp. 749-754 ◽  
Author(s):  
M.A. Rahman ◽  
A.B. Baharudin ◽  
S. Adi ◽  
Nur Izan Syahriah Hussein ◽  
H. Isa ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Machine Tool ◽  
Regression Model ◽  
Cutting Speed ◽  
Cutting Parameters ◽  
Numerical Control ◽  
Depth Of Cut ◽  
Dry Turning ◽  
Tool Vibration ◽  
Dimensional Deviation

Performance of machining processes is assessed by dimensional and geometrical accuracy which is mentioned in this paper as dimensional deviation. A part quality does not depend solely on the depth of cut, feed rate and cutting speed. Other variable such as excessive machine tool vibration due to insufficient dynamic rigidity can be deleterious to the desired results. The focus of the present study is to find a correlation between dimensional deviation against cutting parameters and machine tool vibration in dry turning. Hence cutting parameters and vibration-based regression model can be established for predicting the part dimensional deviation. Experiments are conducted using a Computerized Numerical Control (CNC) lathe with carbide insert cutting tool. Vibration data are collected through a data acquisition system, then tested and analyzed through statistical analysis. The analysis revealed that machine tool vibration has significant effect on dimensional deviation where statistical analysis of individual regression coefficients showed p<0.05. The developed regression model has been validated through experimental tests and found to be reliable to predict dimensional deviation.

Removal of Anions from Solution by Calcined Hydrotalcite and Regeneration of Used Sorbent in Repeated Calcination-Rehydration-Anion Exchange Processes

1999 ◽  
Vol 64 (9) ◽  
pp. 1517-1528 ◽  
Author(s):  
František Kovanda ◽  
Eva Kovácsová ◽  
David Koloušek
Keyword(s):  
Anion Exchange ◽  
Sorption Capacity ◽  
Sorption Isotherms ◽  
Layered Crystal ◽  
Calcined Hydrotalcite ◽  
Capacity Evaluation ◽  
Exchange Processes ◽  
Sorption Ability ◽  
Subsequent Calcination ◽  
Rehydration Process

Synthetic hydrotalcite calcined at 350-550 °C was used for the removal of arsenate, chromate, and vanadate ions from water solutions. The initial anion concentrations were 0.002 mol l-1. The sorption isotherms were measured at 20 °C and at neutral pH. The Langmuir adsorption isotherm was used for the sorption capacity evaluation. The ability of the calcined hydrotalcite to remove the anions from solution decreased in the order of vanadate - arsenate - chromate. The hydrotalcite calcined at 450 °C exhibited the best sorption ability for all the anions. The sorbed anions were released by anion exchange in a carbonate-containing solution and the hydrotalcite after subsequent calcination was used again for the removal of anions. The repeating cycles calcination-rehydration-anion exchange gradually reduced the adsorption capacity of the hydrotalcite. The sorption capacity decreased by 50% after the first two cycles but it did not change significantly in the subsequent cycles. When chromate anions were adsorbed, the decrease in sorption capacity was not observed during repeated calcination-rehydration-anion exchange cycles. The change in the sorption capacity was influenced by the ability of calcined hydrotalcite to regenerate the layered crystal structure during the rehydration process.

scholarly journals Sorption of V and VI group metalloids (As, Sb, Te) on modified peat sorbents

2016 ◽  
Vol 14 (1) ◽  
pp. 46-59 ◽  
Author(s):  
Linda Ansone-Bertina ◽  
Maris Klavins
Keyword(s):  
Sorption Capacity ◽  
Batch Tests ◽  
Physical Sorption ◽  
Sorption Ability ◽  
A Minor ◽  
Competing Ions ◽  
Optimal Ph ◽  
Sorption Time

AbstractThe present work investigates arsenic, antimony and tellurium sorption using iron modified peat. The results were obtained using batch tests and the sorption was studied as a function of initial metalloid concentration, pH and sorption time, as well as the presence of competing substances. The obtained results indicate that modification of peat with Fe compounds significantly enhances the sorption capacity of the sorbents used for sorption of arsenic, antimony and tellurium. The optimal pH interval for the sorption of Sb(III) is 6.5–9 and for As(V) and Sb(V) – 3–6, while As(III) and tellurium sorption using Fe-modified peat is favourable in a wider interval of 3–9. The presence of competing ions as well as HA affect sorption of metalloids on Fe-modified peat. A minor impact on the reduction of metalloid sorption was detected in the presence of nitrate, sulphate, carbonate and tartrate ions, while in the presence of phosphate and HA the sorption ability of metalloids can be considerably reduced. The obtained results of kinetic experiments indicate that sorption of metalloids on Fe-modified peat mainly occurs relying on mechanisms of physical sorption processes.

scholarly journals Statistical analysis of basis factor influence on in-transit freight in Ukraine by regression model

2013 ◽  
pp. 12-16
Author(s):  
G. Golubova
Keyword(s):  
Statistical Analysis ◽  
Regression Model ◽  
Regressive Model ◽  
Main Factors ◽  
In Transit

In the article, a component has selected the method of main among plenty of indexes 4 main factors which were fixed in a basis of the construction of regressive model of transit traffics of goods Ukraine.

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