The surface state assessment in corrosion equipment monitoring

2019 ◽  
Author(s):  
S. S. Vinogradova ◽  
R. F. Tazieva ◽  
A. N. Akhmetova
Keyword(s):  
Surface State ◽  
State Assessment ◽  
Equipment Monitoring

scholarly journals CALCULATION METHOD OF IMPEDANCE MODULE FOR CORROSION MONITORING OF SURFACE STATE OF CHROMONICKEL STEELS

2020 ◽  
Vol 63 (3) ◽  
pp. 60-66
Author(s):  
Svetlana S. Vinogradova ◽  
Anna N. Akhmetova ◽  
Ramilya F. Tazieva
Keyword(s):  
Pitting Corrosion ◽  
Surface State ◽  
Transformation Method ◽  
State Assessment ◽  
Fast Fourier Transformation ◽  
Corrosion Monitoring ◽  
Angular Coefficient ◽  
Boundary Values ◽  
State Monitoring ◽  
Additional Criterion

In discussed issue the additional criterion for chromium-nickel steels surface state assessment is proposed. It is used in periodic potentiostatic regime of stainless steels surface state monitoring under the condition of pitting corrosion origin. Electrochemical investigations were carried out with pitting corrosion resistant austenitic (12Х18Н10Т) and austenitic-ferritic chromium-nickel steels 10Х17Н13М2Т in chloride solutions of 0.1 mol/L NaCl and 0.5 mol/l NaCl with the additional oxidant K2Cr2O7. Polarization curves were recorded under potentiostatic mode of polarization in the electrochemical three-electrode cell using the ZIVE SP2 workstation and a personal computer. The fast Fourier transformation method was used for conducting the spectral analysis, as this method is more effective in terms of the algorithmic complexity when processing a large amount of the initial data. It is established that scalar impedance angular coefficient shows the current oscillation frequencies change concerned with the pitting occurrence and passivation process. The scalar impedance angular coefficient allows to estimate the pitting corrosion evaluation processes boundaries: passivity; metal dissolution due to the development of metastable pittings; the metastable nucleation and passivation processes concurred with the stable pitting development. The algorithm based on the statistical method of spectral analyses for scalar impedance angular coefficient calculation is developed. It is established that the decrease in passive film total resistance corresponds to the breakdown process and first metastable, and then stable local surface destructions that reflect on the higher the scalar impedance angular coefficient value. The boundary values of an additional criterion for surface state assessment were proposed, on the basis of which an interval scale was constructed to determine the current state of the surface of chromium-nickel steels. It is shown that the boundary values of the scalar impedance angular coefficient correspond to the metallographic studies of investigated steels.

scholarly journals Study Regarding the Surface State of Composite Resins After Finishing and Polishing Using Different Systems

2017 ◽  
Vol 54 (4) ◽  
pp. 689-693
Author(s):  
Sorin Andrian ◽  
Gianina Iovan ◽  
Galina Pancu ◽  
Claudiu Topoliceanu ◽  
Andrei Georgescu ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface State ◽  
State Assessment ◽  
Composite Resins ◽  
Abrasive Particles ◽  
Group 4 ◽  
One Step ◽  
Group 3 ◽  
Group 2 ◽  
Cylindrical Samples

The aim of this study was to evaluate the influence of different finishing and polishing systems and of composite resins structure on surface state of the restoration. Cylindrical samples from two different composite resins (Filtek Z 550 and Filtek Z 250, 3M ESPE) were obtained. In group 1 the samples were not finished and polished. In groups 2-4 the samples were submitted to finishing procedure using two tungsten carbide burs, then polished using three different polishing systems: three steps diamond abrasive polishers (Kenda CGI, Lichtenstein) - group 2, one step silicon carbide abrasive particles brush (Occlubrush, KerrHawe SA, Switzerland) - group 3 and two steps Sof-Lex spiral wheels (3M ESPE) - group 4. Half of the samples in each group were subjected to surface microstructure evaluation using a scanning electron mycroscope. The other half of the samples was subjected to surface state assessment using profilometery. All the investigated finishing and polishing systems leaded to increased surface roughness when compared to the roughness of composite resins placed in direct contact to celluloid clear matrix. The surface roughness of both microfilled-hybrid and nanofilled-hybrid composite resins finished and polished with different systems were influenced mostly by the polishing system and less by the composite resin structure.

Methods of essential variables determination for the Earth’s surface state assessing

2018 ◽  
Vol 24 (4) ◽  
pp. 26-40 ◽  
Author(s):  
B.Ya. YAILYMOV ◽  
◽  
M.S. LAVRENIUK ◽  
A.Yu. SHELESTOV ◽  
A.V. KOLOTII ◽  
...  
Keyword(s):  
Surface State

THE ENTERPRISE ECONOMIC SECURITY SYSTEM: THE STATE ASSESSMENT USING MANAGEMENT FUNCTIONAL TYPES

2020 ◽  
Vol 14 (1) ◽  
pp. 183-200
Author(s):  
Olena Illiashenko ◽  
Yevhenii Rudnichenko ◽  
Tetiana Momot ◽  
Nataliia Havlovska
Keyword(s):  
Economic Security ◽  
State Assessment ◽  
The State ◽  
Security System ◽  
Functional Types

Resonances in the photoemission cross section of a surface state: Results for Ag(111)

1987 ◽  
Vol 35 (8) ◽  
pp. 3728-3733 ◽  
Author(s):  
T. C. Hsieh ◽  
P. John ◽  
T. Miller ◽  
T.-C. Chiang
Keyword(s):  
Cross Section ◽  
Surface State

scholarly journals Magnetic order and surface state gap in (Sb0.95Cr0.05)2 Te3

2021 ◽  
Vol 103 (6) ◽  
Author(s):  
T. K. Dalui ◽  
P. K. Ghose ◽  
S. Majumdar ◽  
S. K. Mahatha ◽  
F. Diekmann ◽  
...  
Keyword(s):  
Surface State ◽  
Magnetic Order

A Survey of Computational Methods for Online Mental State Assessment on Social Media

2021 ◽  
Vol 2 (2) ◽  
pp. 1-31
Author(s):  
Esteban A. Ríssola ◽  
David E. Losada ◽  
Fabio Crestani
Keyword(s):  
Social Media ◽  
Mental Disorders ◽  
Mental State ◽  
Extraction Process ◽  
State Assessment ◽  
Future Research ◽  
Linguistic Markers ◽  
Online Social Media ◽  
Suicide Behaviour ◽  
Social Media Platforms

Mental state assessment by analysing user-generated content is a field that has recently attracted considerable attention. Today, many people are increasingly utilising online social media platforms to share their feelings and moods. This provides a unique opportunity for researchers and health practitioners to proactively identify linguistic markers or patterns that correlate with mental disorders such as depression, schizophrenia or suicide behaviour. This survey describes and reviews the approaches that have been proposed for mental state assessment and identification of disorders using online digital records. The presented studies are organised according to the assessment technology and the feature extraction process conducted. We also present a series of studies which explore different aspects of the language and behaviour of individuals suffering from mental disorders, and discuss various aspects related to the development of experimental frameworks. Furthermore, ethical considerations regarding the treatment of individuals’ data are outlined. The main contributions of this survey are a comprehensive analysis of the proposed approaches for online mental state assessment on social media, a structured categorisation of the methods according to their design principles, lessons learnt over the years and a discussion on possible avenues for future research.

Sign in / Sign up

Export Citation Format

Share Document