Stability Effect of Metallic Traces in the Degradation of Materials

2021 ◽  
Vol 395 (1) ◽  
pp. 2000224
Author(s):  
Traian Zaharescu ◽  
Tunde Borbath ◽  
Ignazio Blanco ◽  
Istvan Borbath
Keyword(s):  
Degradation Of Materials ◽  
Stability Effect

GLASS STABILITY EFFECT OF IRON OXIDE ADDED TO ALKALINE EARTH BORATE GLASSES

2007 ◽  
Vol 21 (05) ◽  
pp. 731-736
Author(s):  
V. SIMON ◽  
P. RIEDL ◽  
E. TATARU
Keyword(s):  
Iron Oxide ◽  
Short Range ◽  
Alkaline Earth ◽  
Structural Changes ◽  
Opposite Effect ◽  
Glass Stability ◽  
Intermediate Range Order ◽  
Alkaline Earths ◽  
Stability Effect

Glass stability and the structural role of iron oxide in x Fe 2 O 3(100-x)[ B 2 O 3– MO ] systems ( M=Ca , Sr or Ba , 0≤x≤30 mol%) were estimated from differential thermal analysis. The results suggest structural changes characteristic for the transition from short range to intermediate range order as the cationic field strength of the alkaline earths increases. In contrast, the iron addition has an opposite effect and determines a higher glass stability of these systems.

scholarly journals Single and Dual physical link failures stability effect on degree three WDM networks

2010 ◽  
Author(s):  
Jose M. Gutierrez ◽  
Tahir Riaz ◽  
Jens M. Pedersen ◽  
Ole B. Madsen ◽  
Konstantinos Georgakilas ◽  
...  
Keyword(s):  
Wdm Networks ◽  
Link Failures ◽  
Stability Effect

scholarly journals Atmospheric stability effect on subgrid-scale physics for large-eddy simulation

2001 ◽  
Vol 24 (9-10) ◽  
pp. 1085-1102 ◽  
Author(s):  
Fernando Porté-Agel ◽  
Markus Pahlow ◽  
Charles Meneveau ◽  
Marc B. Parlange
Keyword(s):  
Large Eddy Simulation ◽  
Atmospheric Stability ◽  
Subgrid Scale ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Stability Effect

Degradation of Materials Based on Alkali-Activated Blast-Furnace Slag after Exposure to Aggressive Environments

2021 ◽  
Vol 325 ◽  
pp. 131-136
Author(s):  
Iveta Plšková ◽  
Petr Hrubý ◽  
Libor Topolář ◽  
Michal Matysík
Keyword(s):  
Blast Furnace ◽  
Ammonium Nitrate ◽  
Sodium Sulfate ◽  
Blast Furnace Slag ◽  
Nitrate Solution ◽  
Ammonium Nitrate Solution ◽  
Degradation Of Materials ◽  
Non Destructive ◽  
Furnace Slag ◽  
Alkali Activated

The paper summarizes partial results of a study of degradation of materials based on alkali-activated blast-furnace slag (AAS) and comparative on cement CEM III/A 32.5 R after exposure to aggressive environments. It further specifies the possibilities for utilising destructive and non-destructive techniques to determine the progress of degradation and characterizes the degree of their correlation. After 28 days of ageing in a water environment, the produced test specimens (40×40×160 mm beams) were placed in aggressive media (ammonium nitrate solutions; sodium sulfate, rotating water) and after subsequent 28, 56 and 84 days of degradation were subjected to testing. Testing comprised both a destructive form (determination of compressive strength and flexural strength) and a selected non-destructive technique (Impact-echo method). The partial outputs were supplemented by the results acquired from monitoring weight changes. In addition, the development of Ultrasonic Pulse Velocity in relation to the progress of the degradation processes was also monitored. While the exposure of both test specimens to water and sodium sulfate did not result in any significant changes, the exposure to the ammonium nitrate solution exhibited rapid signs of degradation associated with a significant reduction in functional characteristics.

scholarly journals Thermal stability effect of H4[PVMo11O40]/SiO2

2017 ◽  
Vol 1 (2) ◽  
pp. 25-28 ◽  
Author(s):  
Leni Sinaga ◽  
Aldes Lesbani
Keyword(s):  
Thermal Stability ◽  
Stability Effect

scholarly journals Effect of High Temperature on the Electrochemical and Optical Properties of Emeraldine Salt Doped with DBSA and Sulfuric Acid

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Salma Gul ◽  
Anwar-ul-Haq Ali Shah ◽  
Salma Bilal
Keyword(s):  
Thermal Stability ◽  
Cyclic Voltammetry ◽  
Sulfuric Acid ◽  
Effect Of Temperature ◽  
Visible Spectroscopy ◽  
Emeraldine Salt ◽  
Higher Temperature ◽  
Stability Effect ◽  
Thermal Stability Of ◽  
Comprehensive Study

A comprehensive study of thermally treated polyaniline in its emeraldine salt form is presented here. It offers an understanding of the thermal stability of the polymer. Emeraldine salt was prepared by a novel emulsion polymerization pathway using dodecylbenzene sulfonic acid and sulfuric acid together as dopants. The effect of temperature and heating rate on the degradation of this emeraldine salt was studied via thermogravimetric analysis. The thermally analyzed sample was collected at various temperatures, that is, 250, 490, 500, and 1000°C. The gradual changes in the structure of the emeraldine salt were followed through cyclic voltammetry, Fourier transform infrared spectroscopy, and ultraviolet-visible spectroscopy. Results demonstrate that emeraldine salt shows high thermal stability up to 500°C. This is much higher working temperature for the use of emeraldine salt in higher temperature applications. Further heat treatment seems to induce deprotonation in emeraldine salt. Cyclic voltammetry and ultraviolet-visible spectroscopy revealed that complete deprotonation takes place at 1000°C where it loses its electrical conductivity. It is interesting to note that after the elimination of the dopants, the basic backbone of emeraldine salt was not destroyed. The results reveal that the dopants employed have a stability effect on the skeleton of emeraldine salt.

DETECTION OF STRUCTURAL PATHOLOGIES IN BUILDINGS USING ARCHITECTURAL PHOTOGRAMMETRY

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Frank Navarro Tamayo ◽  
Ana Luisa Rodriguez Quesada ◽  
Veronica Avila Ayon ◽  
Alexander Justel Betancourt
Keyword(s):  
Reinforced Concrete ◽  
Comparative Analysis ◽  
Structural Analysis ◽  
Environmental Pollution ◽  
Reinforced Concrete Structures ◽  
Accurate Data ◽  
Conservation Actions ◽  
Natural Degradation ◽  
Degradation Of Materials ◽  
Deterioration Characteristics

Environmental pollution and natural degradation of materials cause deterioration in buildings, initiating pathological processes that require conservation actions. Architectural Photogrammetry will be discussed as a tool to identify different pathologies on buildings and to accurately measure deflections. A photographic study was conducted of the most common deflections on reinforced concrete structures, with samples of different ages and locations exposed to various environments within Holguin Province in Cuba to detect deterioration characteristics, causes and possible treatments. A comparative analysis of other common methods and instruments currently used to measure structural pathologies highlights the efficiency of architectural photogrammetry. Photogrammetry is suitable to study the most common pathologies, their causes, and potential solutions. These include: cracks, fissures, deflection in beams, footing settlement, slenderness in columns, and more. In addition to the scope and efficiency of photogrammetry, this technology also facilitates studying inaccessible points on large elements. The instantaneous recording of accurate data about physical objects gives photogrammetry advantages over conventional structural analysis methods.

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