The determination of the electrochemical parameters by the best-fitting with exponential polynomials

Five N-p-phenyl substituted benzamidines were studied by DC and DP polarography in a wide pH range. Coulometric results show that the overall processes are four-electron reductions. Logarithmic analysis of the waves indicate that the process are irreversible. The influence of the pH on the polarographic parameters was also studied. A UV spectrophotometric study was performed in the pH range 2-13. In basic media some variations in the absorption bands were observed due to the dissociation of the amidine group. A determination of the pK values was made by deconvolution of the spectra. Correlations of both the electrochemical parameters and spectrophotometric pK values with the Hammett substituent constants were obtained.

Download Full-text

Determination of the Interference Geometry Between Two Convex Objects

Volume 2: 30th Annual Mechanisms and Robotics Conference, Parts A and B ◽

10.1115/detc2006-99616 ◽

2006 ◽

Cited By ~ 1

Author(s):

Lianzhen Luo ◽

Meyer Nahon

Keyword(s):

Contact Force ◽

Contact Area ◽

Contact Dynamics ◽

Continuous Contact ◽

Application Point ◽

Haptic Interactions ◽

Fitting Method ◽

Best Fitting ◽

Arbitrary Objects

The determination of the interference geometry between two arbitrary objects is an essential problem encountered in the simulation of continuous contact dynamics and haptic interactions. In these applications, with known material properties, the interbody contact force is only a function of the interference geometry between two objects. Here a theoretical basis and algorithms for the calculation of the interference geometry, such as overlap region, contact area and normal, and interference volume, are presented. Two methods to obtain the contact area and normal are analyzed: an area-weighted method and a best-fitting method. The geometric properties of the area-weighted method are presented and the degenerate cases related to both methods are discussed. Methods to calculate the application point of an interbody contact force are discussed. Some numerical simulation results are presented based on the implementation of the geometric algorithms, which are verified by comparison with hand calculation. The continuity of contact normal and its application point are demonstrated for a case in which the contacting objects smoothly move with respect to each other in the simulation.

Download Full-text

Determination of time dependence of coated metal electrical and electrochemical parameters during exposure using principal component analysis

Progress in Organic Coatings ◽

10.1016/j.porgcoat.2016.02.012 ◽

2016 ◽

Vol 96 ◽

pp. 80-87 ◽

Cited By ~ 1

Author(s):

Andrzej Miszczyk ◽

Kazimierz Darowicki

Keyword(s):

Principal Component Analysis ◽

Time Dependence ◽

Principal Component ◽

Component Analysis ◽

Coated Metal ◽

Electrochemical Parameters

Download Full-text

Determination of sectorially best‐fitting isotropic background media

10.1190/1.1851179 ◽

2004 ◽

Author(s):

Claudia Vanelle ◽

Dirk Gajewski

Keyword(s):

Best Fitting

Download Full-text

Least-squares Analysis of Fabric Data: A Note on Conical, Cylindroidal and Near–cylindroidal Folds

Canadian Journal of Earth Sciences ◽

10.1139/e71-066 ◽

1971 ◽

Vol 8 (6) ◽

pp. 694-697 ◽

Cited By ~ 5

Author(s):

C. S. Venkitasubramanyan

Keyword(s):

Least Squares ◽

Stereographic Projection ◽

Rotation Axis ◽

Computational Procedure ◽

Apical Angle ◽

Small Circle ◽

Best Fitting ◽

Fabric Diagrams ◽

The Mean

A cylinder and a plane may be considered as special limiting cases for a right circular cone as the semi-apical angle approaches 0° and 90° respectively (Loudon 1964, Kelley 1966). If these forms are viewed as surfaces generated by an array of lines in space, the rotation axis for the array (the axis of the "cone") can be determined from the orientations of the surface-generating lines by a single computational procedure, using least-squares criterion. The mean angle between the rotation axis and the surface-generating lines will be the semi-apical angle of the cone. However, if this method for determination of the semi-apical angle of the cone, and therefore the best-fitting small circle, is extended to fabric diagrams, in which an array of lines may only statistically describe a great circle or small circle on a stereographic projection, ambiguities arise in certain cases and the semi-apical angle obtained may not be the true semi-apical angle. The difficulty arises because the poles to foliation surfaces are arbitrarily assigned "senses".

Download Full-text

Determination of the chemical and electrochemical parameters for a CE system by methods of convolution electrochemistry

Journal of Electroanalytical Chemistry ◽

10.1016/j.jelechem.2003.07.044 ◽

2004 ◽

Vol 563 (2) ◽

pp. 283-290 ◽

Cited By ~ 6

Author(s):

Y.I Moharram

Keyword(s):

Electrochemical Parameters

Download Full-text

Application of Numerical Analysis of the Shape of Electron Paramagnetic Resonance Spectra for Determination of the Number of Different Groups of Radicals in the Burn Wounds

Oxidative Medicine and Cellular Longevity ◽

10.1155/2017/4683102 ◽

2017 ◽

Vol 2017 ◽

pp. 1-8 ◽

Cited By ~ 2

Author(s):

Paweł Olczyk ◽

Katarzyna Komosinska-Vassev ◽

Paweł Ramos ◽

Łukasz Mencner ◽

Krystyna Olczyk ◽

...

Keyword(s):

Electron Paramagnetic Resonance ◽

Repair Process ◽

Spectral Shape ◽

Dipolar Interactions ◽

Epr Spectrum ◽

Paramagnetic Resonance ◽

Burn Wounds ◽

Best Fitting ◽

Electron Paramagnetic

Background. The evidence exists that radicals are crucial agents necessary for the wound regeneration helping to enhance the repair process. Materials and methods. The lineshape of the electron paramagnetic resonance (EPR) spectra of the burn wounds measured with the low microwave power (2.2 mW) was numerically analyzed. The experimental spectra were fitted by the sum of two and three lines. Results. The number of the lines in the EPR spectrum corresponded to the number of different groups of radicals in the natural samples after thermal treatment. The component lines were described by Gaussian and Lorentzian functions. The spectra of the burn wounds were superposition of three lines different in shape and in linewidths. The best fitting was obtained for the sum of broad Gaussian, broad Lorentzian, and narrow Lorentzian lines. Dipolar interactions between the unpaired electrons widened the broad Gaussian and broad Lorentzian lines. Radicals with the narrow Lorentzian lines existed mainly in the tested samples. Conclusions. The spectral shape analysis may be proposed as a useful method for determining the number of different groups of radicals in the burn wounds.

Download Full-text