Interfacial compliance, energy dissipation, frequency effects, and long‐term fretting corrosion performance of Ti‐6Al‐4V / CoCrMo interfaces

2021 ◽  
Author(s):  
Stephanie M. Smith ◽  
Jeremy L. Gilbert
Keyword(s):  
Energy Dissipation ◽  
Corrosion Performance ◽  
Fretting Corrosion ◽  
Frequency Effects

Synthesis of hydrophobic fluoro-substituted polyaniline filler for the long-term anti-corrosion performance enhancement of epoxy coatings

2021 ◽  
Vol 178 ◽  
pp. 109094
Author(s):  
Cheng Li ◽  
Yuan Li ◽  
Xiao Wang ◽  
Sicheng Yuan ◽  
Dan Lin ◽  
...  
Keyword(s):  
Performance Enhancement ◽  
Corrosion Performance ◽  
Epoxy Coatings

scholarly journals Syllable frequency effects on phonological short-term memory tasks

2002 ◽  
Vol 23 (4) ◽  
pp. 643-659 ◽  
Author(s):  
LISA M. NIMMO ◽  
STEVEN ROODENRYS
Keyword(s):  
Serial Recall ◽  
Short Term Memory ◽  
Nonword Repetition ◽  
Long Term Memory ◽  
Short Term ◽  
Recall Accuracy ◽  
Syllable Frequency ◽  
Term Memory ◽  
Frequency Effects

Recent evidence suggests that phonological short-term memory (STM) tasks are influenced by both lexical and sublexical factors inherent in the selection and construction of the stimuli to be recalled. This study examined whether long-term memory (LTM) influences STM at a sublexical level by investigating whether the frequency with which one-syllable nonwords occur in polysyllabic words influences recall accuracy on two phonological STM tasks, nonword repetition and serial recall. The results showed that recall accuracy increases when the stimuli to be recalled consist of one-syllable nonwords that occur often in polysyllabic English words. This result is consistent with the notion that LTM facilitates phonological STM at both a lexical and sublexical level. Implications for models of verbal STM are discussed.

Energy quadratization Runge-Kutta method for the modified phase field crystal equation

2021 ◽  
Author(s):  
Jaemin Shin ◽  
Hyun Geun Lee ◽  
June-Yub Lee
Keyword(s):  
Energy Dissipation ◽  
Phase Field ◽  
Mass Conservation ◽  
Energy Functional ◽  
Original Model ◽  
Auxiliary Variables ◽  
Runge Kutta Method ◽  
Runge Kutta ◽  
Phase Field Crystal

Abstract In this paper, we propose high order and unconditionally energy stable methods for a modified phase field crystal equation by applying the strategy of the energy quadratization Runge–Kutta methods. We transform the original model into an equivalent system with auxiliary variables and quadratic free energy. The modified system preserves the laws of mass conservation and energy dissipation with the associated energy functional. We present rigorous proofs of the mass conservation and energy dissipation properties of the proposed numerical methods and present numerical experiments conducted to demonstrate their accuracy and energy stability. Finally, we compare long-term simulations using an indicator function to characterize the pattern formation.

Wear of Electric Contact Surfaces

2007 ◽  
Author(s):  
J. Song
Keyword(s):  
Wear Resistance ◽  
Precious Metals ◽  
Electrical Contacts ◽  
Fretting Corrosion ◽  
Coating Materials ◽  
Long Term Stability ◽  
Electric Contacts ◽  
Contact Surfaces ◽  
Contact Shape

Fretting corrosion is one of the important factors which limits the lifetime of electric contacts. In order to avoid fretting corrosion coatings of different precious metals are used. The wear resistance of the coating determines the lifetime of electrical contacts. The long term characteristics of gold coated electrical contacts with different additives and contact shapes are investigated and the results are analyzed. It is found out that the wear resistance of contact coating can be largely influenced by the amount of the additive in gold and by the design of the contact shape. Only the combination of an optimized contact shape with suitable coating materials leads to a long term stability of electric contacts.

Loading Frequency Effects on the Fatigue Crack Growth Rate and Fracture Surface Morphology of Low Carbon Steel in Case of Long-Term Use in Hydrogen Gas

2011 ◽  
Vol 488-489 ◽  
pp. 323-326
Author(s):  
A. Nishimoto ◽  
Yasuji Oda ◽  
Hiroshi Noguchi
Keyword(s):  
Carbon Steel ◽  
Fracture Surface ◽  
Surface Morphology ◽  
Low Carbon Steel ◽  
Hydrogen Gas ◽  
Loading Frequency ◽  
Fracture Surface Morphology ◽  
Low Carbon ◽  
Frequency Effects

Loading frequency effects on FCGR and fracture surface morphology were investigated on pre-strained low carbon steel in high FCGR range. Loading frequency effects showed the different trend between internal hydrogen and environmental hydrogen. The effects of combined condition hydrogen revealed similar tendency of environmental hydrogen.

scholarly journals Corrosion of Aluminium and Zinc in Concrete at Simulated Conditions of the Repository of Low Active Waste in Sweden

2021 ◽  
Vol 2 (2) ◽  
pp. 150-163
Author(s):  
Gunilla Herting ◽  
Inger Odnevall
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Structural Integrity ◽  
Hydrogen Gas ◽  
Corrosion Performance ◽  
Corrosion Rates ◽  
Production Of Hydrogen ◽  
Concrete Cylinders ◽  
Active Waste

The corrosion performance of Aluminium (Al) and zinc (Zn) is of interest in repositories for radioactive waste as the production of hydrogen gas during their anoxic corrosion may create open pathways for the transport of radioactive ions. Al and Zn rods were embedded in concrete cylinders and immersed in artificial groundwater at anaerobic conditions for 2 weeks and up to 2 years in laboratory conditions. Corrosion rates were determined to enable predictions and estimations of risks for gas evolution and the assessment of the potential impact of corrosion on the structural integrity of concrete in the final repository of low and intermediate level metal-containing waste from dismantled nuclear power plants. Samples were collected after 2, 4, 12, 26, 52 and 104 weeks. The observed corrosion rates were higher for Al compared with Zn, as expected, but both materials revealed comparatively high initial corrosion rates that decreased with time, reaching steady state after 26–52 weeks. Some of the Al containing concrete cylinders were cracked as a result of the corrosion processes after 2 years of exposure, thereby providing free passage between the embedded metal and the surrounding environment. No such effects were observed for Zn. Comparative studies were performed on non-concrete-embedded Al and Zn immersed in artificial groundwater. Observed long-term corrosion rates (1–2 years) were similar to corresponding corrosion rates in concrete. The results indicate that immersion studies in artificial groundwater can be used to estimate the long-term corrosion performance of Zn and Al in concrete.

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