Long-term aging effect on led circuit with fe-based amorphous current transformer

1993 ◽  
Vol 76 (7) ◽  
pp. 68-76
Author(s):  
Minoru Fukuhara ◽  
Hidenori Kakehashi ◽  
Yukihiko Ohta ◽  
Hirotoshi Fukunaga ◽  
Tamotsu Ninomiya
2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
Shiyong Jiang ◽  
Weilai Yao ◽  
Jin Chen ◽  
Tao Cai

External bonding of FRP laminates to the tension soffit of concrete members has become a popular method for flexural strengthening. However, the long-term field performance of FRP-strengthened RC members under service conditions is still a concern, and more work needs to be done. Based on concrete smeared-crack approach, this paper presents a finite-element (FE) model for predicting long-term behavior of FRP-strengthened RC beam, which considers the time-dependent properties of all components including the aging effect of concrete. According to the comparison between theoretical predictions and test results, the validity of the FE model is verified. The interfacial edge stresses in adhesive layer were determined through appropriate mesh refinement near the plate end, and their time-dependent characteristics were investigated. The results show that creep of concrete and epoxy resin cause significant variations of the edge stresses with time. According to the research in this paper, the FE approach is found to be able to properly simulate the long-term behavior of the FRP-strengthened beam and help us better understand the complex changes in the stress state occurring over time.


1991 ◽  
Vol 30 (Part 1, No. 11A) ◽  
pp. 2765-2769 ◽  
Author(s):  
Yukihiko Ohta ◽  
Hidenori Kakehashi ◽  
Minoru Fukuhara ◽  
Hirotoshi Fukunaga

2015 ◽  
Vol 47 (1) ◽  
pp. 100-107 ◽  
Author(s):  
F. Xue ◽  
W. W. Yu ◽  
M. Yu ◽  
W. Liu ◽  
G. G. Shu
Keyword(s):  

2016 ◽  
Vol 21 (2) ◽  
pp. 228-242 ◽  
Author(s):  
Cornelia Lahmann ◽  
Rasmus Steinkrauss ◽  
Monika S Schmid

Aims and objectives/purpose/research questions: The present study investigated which factors would best predict second-language (L2) fluency in a group of long-term L2 speakers of different English varieties with German as their first language. Design/methodology/approach: L2 fluency was conceptualized in terms of utterance fluency for which speed, breakdown and repair fluency were distinguished. Data and analysis: Multiple measures of utterance fluency were applied to four-minute speech fragments originating from 102 spontaneous oral interviews. Interviewees’ ages of onset ranged from 7 to 17, whereas their ages at interview ranged from 57 to 87. Multifactorial analyses yielded significant effects of age at interview. Findings/conclusions: Whereas the mean number of silent pauses and repairs increases, syllable duration decreases. This leaves room for interpretation as to why we find an aging effect. Overall, the evidence suggests that the usual, L2 acquisition-specific factors, such as age of onset or length of residence, are no longer at play to predict L2 fluency. Originality and significance/implications: To this point L2 fluency in very advanced, highly proficient L2 speakers has received little attention. The results point to the need for more research into highly proficient L2 users.


Brachytherapy ◽  
2014 ◽  
Vol 13 ◽  
pp. S16-S17
Author(s):  
Mira Keyes ◽  
Tom Pickles ◽  
Ingrid Spadinger ◽  
Vincent LaPointe ◽  
Michael McKenzie ◽  
...  

Author(s):  
Sven Nagelschmidt ◽  
Ulrich Probst ◽  
Holger Völzke ◽  
Dietmar Wolff

The Bundesanstalt für Materialforschung und –prüfung (BAM) is a federal institute for materials research and testing in Germany and has been involved in the qualification and safety evaluation procedures of metal seals from the early beginning of the interim storage licensing procedures for radioactive materials, stored in dual purpose casks. Regarding this subject, BAM investigates the long-term behavior of metal seals under the influence of temperature using experimental data and analytical approaches. The development of numerical models is in progress as well. Systematic experimental investigations performed by BAM indicate a continuous decrease of the remaining seal force and the usable resilience considering the leak tightness. Hence, there is a fundamental interest of describing time and temperature dependency to gain predictable values for the long-term behavior and to achieve reliable results with help of short-term tests. The paper gives an overview about the sealing principle, test program and test results of metal seals of the type HELICOFLEX® HN200. The aging effect, respectively the long-term behavior in dependency of time and temperature, are introduced for two different outer liner materials, aluminum and silver.


2019 ◽  
Vol 177 (2) ◽  
pp. 187-192
Author(s):  
Joanna FABER ◽  
Zbigniew JURASZ ◽  
Krzysztof BRODZIK

Efforts to improve engine cooling efficiency by usage of heat exchanger as well as research on cooling fluids composition and properties are well described. Studies on heat exchangers are focused mainly on their durability properties, while cooling fluids development is lately concentrating on nanofluids. In this paper physicochemical properties changes of diluted glycol-based cooling fluid in a long-term durability test of vehicle heat exchanger, were investigated. Following parameters were measured: density of coolant, pH value, elements content in coolant, and reserve alkalinity. Above mentioned analyses were performed on samples collected both in the beginning and periodically after every 500 hours of durability test which lasted for 3000 hours in total. The performed study leads to conclusion that interaction of cooling fluid with material of heat exchanger and changes in glycol composition during long-lasting durability test allows to determine aging effect of applied glycol solution on heat exchanger wear.


Sign in / Sign up

Export Citation Format

Share Document