scholarly journals Experimental Data Deconvolution Based on Fourier Transform Applied in Nanomaterial Structure

10.5772/59667 ◽  
2015 ◽  
Author(s):  
Adrian Bot ◽  
Nicolae Aldea ◽  
Florica Matei
Keyword(s):  
Experimental Data ◽  
Fourier Transform

scholarly journals DECIPHERING THE FINEST IMPRINT OF GLACIAL EROSION: OBJECTIVE ANALYSIS OF STRIAE PATTERNS ON BEDROCK

2011 ◽  
Vol 23 (3) ◽  
pp. 135 ◽  
Author(s):  
Piet Stroeven ◽  
Arjen Peter Stroeven ◽  
Jing Hu ◽  
Jean-Louis Chermant ◽  
Michel Coster
Keyword(s):  
Experimental Data ◽  
Image Analysis ◽  
Fourier Transform ◽  
Fast Fourier Transform ◽  
Orientation Distribution ◽  
Experimental Investigations ◽  
Automatic Image Analysis ◽  
Glacial Erosion ◽  
Analysis Techniques ◽  
Image Analysis Techniques

The aim of this study is to compare the efficiency of different mathematical and statistical geometrical methods applied to characterise the orientation distribution of striae on bedrock for deciphering the finest imprint of glacial erosion. The involved methods include automatic image analysis techniques of Fast Fourier Transform (FFT), and the experimental investigations by means of Saltikov's directed secants analysis (rose of intersection densities), applied to digital and analogue images of the striae pattern, respectively. In addition, the experimental data were compared with the modelling results made on the basis of Underwood's concept of linear systems in a plane. The experimental and modelling approaches in the framework of stereology yield consistent results. These results reveal that stereological methods allow a reliable and efficient delineation of different families of glacial striae from a complex record imprinted in bedrock.

Microcrystalline Cellulose/Polyurethane Wood Material Preparation and Properties Research

2016 ◽  
Vol 851 ◽  
pp. 122-126
Author(s):  
Wen Kai Zhu ◽  
Yan Wu ◽  
Xiao Yu Hui ◽  
Xiao Tang Wang ◽  
Kun Li Cao
Keyword(s):  
Experimental Data ◽  
Fourier Transform ◽  
Microcrystalline Cellulose ◽  
Tensile Force ◽  
Wood Material ◽  
Compression Performance ◽  
Shape Variable ◽  
Before And After ◽  
Fracture Shape ◽  
Material Preparation

The microcrystalline cellulose (MCC) was used as the filler to modify the properties of polyurethane (PU) woodlike material. As we can see from the experimental data, with the gradually increase the amount of MCC added, polyurethane fracture shape variable and the maximum tensile force also increase accordingly, but due to its large density effect on the performance of other, So MCC to improve the effect of polyurethane compression performance is not very big; Through before and after the modification of Fourier transform infrared spectroscopy, the modification of polyurethane materials in amino carbonyl ester peak, so that MCC and polyurethane chemical reaction happened.

scholarly journals Belt conveyor failure simulation at the design stage with transverse displacements of the belt

2020 ◽  
Vol 168 ◽  
pp. 00056
Author(s):  
Vitalii Monastyrskyi ◽  
Serhii Monastyrskyi ◽  
Denis Nomerovskyi ◽  
Borys Mostovyi
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Fourier Transform ◽  
Adaptive Control ◽  
Design Stage ◽  
Belt Conveyor ◽  
Failure Simulation ◽  
The Fourier Transform ◽  
External Forces ◽  
The Mathematical Model

To find possible conveyor failures at the design stage means to determine a transverse belt displacement and compare the obtained data with the permissible ones. The dynamic problem of the belt movement on the conveyor has been defined. Resistance and external forces, limits of the belt displacement have been determined. The transverse belt displacement can be described by partial differential equations. To solve the problem, the Fourier transform has been used. Change patterns in the transverse belt conveyor displacement dependent on conveyor’s parameters, type of load, and skewing of the idlers along the conveyor have been obtained. The results agree with experimental data. The method of adaptive control of the transverse belt displacement has been described. The essence of this method is to adapt the model of the moving belt in the conveying trough to changed conditions and to reveal the uncertainty of the control with the known parameters of the mathematical model.

scholarly journals High-Resolution Infrared Spectroscopy of the v1+ v4Band of14NF3:Reductions of the Rovibrational Hamiltonian

2012 ◽  
Vol 9 (1) ◽  
pp. 253-259 ◽  
Author(s):  
Hamid Najib ◽  
Siham Hmimou ◽  
Hicham Msahal
Keyword(s):  
Experimental Data ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Excited State ◽  
High Resolution ◽  
Infrared Spectrum ◽  
Fourier Transform Infrared ◽  
Sixth Order ◽  
Degenerate State ◽  
Unitary Equivalence

The high-resolution Fourier transform infrared spectrum of nitrogen trifluoride NF3has been studied in the v1+ v4perpendicular band region around 1523 cm−1. All experimental data have been refined applying various reduction forms of the effective rovibrational Hamiltonian developed for an isolated degenerate state of a symmetric top molecule. The v1= v4= 1 excited state of the14NF3oblate molecule was treated with models taking into account ℓ- andk-type intravibrational resonances. Parameters up to sixth order have been accurately determined and the unitary equivalence of the derived parameter sets in different reductions was demonstrated.

The Nature of Oxygen in Sporopollenin from the Pollen of Typha angustifolia L.

2000 ◽  
Vol 55 (3-4) ◽  
pp. 129-136 ◽  
Author(s):  
Friedhelm Ahlers ◽  
Henning Bubert ◽  
Stefan Steuernage ◽  
Rolf Wiermann
Keyword(s):  
Experimental Data ◽  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Complex Structure ◽  
Resonance Spectroscopy ◽  
Hydroxyl Groups ◽  
Spectroscopic Methods ◽  
Typha Angustifolia ◽  
Ester Linkage ◽  
C Nmr

Abstract Native and peracetylated sporopollenin from the pollen of Typha angustifolia L. was investigated using several spectroscopic methods, inducing Fourier transform infrared spectroscopy (FTIR), solid-state 13C-nuclear magnetic resonance spectroscopy ( 13C-NMR) and Xray photoelectron spectrometry (XPS). Interpretation of the experimental data shows that the greater part of oxygen found in sporopollenin originates from hydroxyl groups and must be derived from aliphatics and not from aromatics. This result indicates that not only aromatics and long unbranched aliphatics but also poly-hydroxyl aliphatic components are involved in the complex structure of the polymer. Furthermore, it is most probable that the monomers of the sporopollenin skeleton are linked by ether- and not by ester-linkage. Two possible approaches are suggested for the characterisation of sporopollenin structure.

scholarly journals Error analysis of tomographic reconstructions in the absence of projection data

2015 ◽  
Vol 373 (2043) ◽  
pp. 20140394 ◽  
Author(s):  
Snehlata Shakya ◽  
Prabhat Munshi
Keyword(s):  
Experimental Data ◽  
Fourier Transform ◽  
Error Estimates ◽  
Projection Data ◽  
Micro Ct ◽  
Ct Scanner ◽  
X Ray ◽  
Level Data ◽  
The Given ◽  
Comparative Error

Error estimates for tomographic reconstructions (using Fourier transform-based algorithm) are available for cases where projection data are available. These data are used for reconstructions with different filter functions and the reliability of these reconstructions can be checked as per guidelines of those error estimates. There are cases where projection data are large (in gigabytes or terabytes) so storage of these data becomes an issue. It leads to storing of only the reconstructed images. Error estimation in such cases is presented here. Second-level projection data are calculated from the given reconstructed images (‘first-level’ images). These ‘second-level’ data are now used to generate ‘second-level’ reconstructed images. Different filter functions are employed to check the fidelity of these ‘second-level’ images. This inference is extended to first-level images in view of the characteristics of the convolution operator. This approach is validated with experimental data obtained by the X-ray micro-CT scanner installed at IIT Kanpur. Five specimens (of same material) have been scanned. Data are available in this case thus we have performed a comparative error estimate analysis for the ‘first-level’ reconstructions (data obtained from CT machine) and second-level reconstructions (data generated from first-level reconstructions). We observe that both approaches show similar outcome. It indicates that error estimates can also be applied to images when data are not available.

The Influence of pH on the Formation and Stability of Thaumasite

2012 ◽  
Vol 174-177 ◽  
pp. 268-274 ◽  
Author(s):  
Chang Hui Yang ◽  
Ben Wan Liu ◽  
Xiao Bin Xiang ◽  
Jing Zhang
Keyword(s):  
Experimental Data ◽  
Fourier Transform ◽  
Sodium Bicarbonate ◽  
Sodium Hydroxide ◽  
Sodium Sulfate ◽  
Fourier Transform Infrared ◽  
X Ray Diffraction ◽  
X Ray ◽  
Optimum Ph ◽  
Influence Of Ph

The samples were prepared to study the influence of pH on the formation and stability of thaumasite using Fourier transform infrared and X-ray diffraction to analyze the composition of the samples. The erosion solutions with the pH arranged from 9.5 to 13.5 prepared by sodium bicarbonate, sodium hydroxide and 5% sodium sulfate. The experimental data for three years has been given in the paper. The result of the research indicates that the value of pH at 10.5 is the optimum pH for the forming of thaumasite and when the pH comes up to 11.5, thaumastie can form but it will decompose in the solution.

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