a new model is proposed in this research to calculate the longitudinal strengthof unidirectional e-glass reinforced polymer composites exposed to sulfuricacid environment, using a micromechanics model. in the proposed method,it is assumed that the residual strength of the degraded composites under acidic environment can be calculated by knowing the degraded strength properties of the constituen...

The rangeland in the Khangai mountain region in Mongolia has degraded for the last decades mainly because of overgrazing and climate change. Livestock production is important part of the economy and is based on natural rangeland. In this research we seek to elucidate the influence of five years (2004-2009) of protection from grazing on vegetation cover of different degradation levels of Fes...

This paper discussed a two-unit cold standby system by considering the concepts of degradation, inspection, preventive maintenance (PM), and priority. The unit works as a reduced capacity after its repair and is called degraded unit. There is a single repairman who visits the system immediately. The repairman inspects the failed degraded unit to see the feasibility of repair. If the repair of t...

AOC herein describes a collection of material degradation features observed in Vertical Cavity Surface Emitting Lasers (VCSELs) that have been intentionally degraded with a range of electrostatic discharge (ESD) stress conditions. Failure analysis techniques employed include emission microscopy, Focused Ion Beam (FIB) microscopy and Transmission Electron Microscopy (TEM). The results have enabl...

Depending on the application in which power electronic converters (PECs) are deployed, failure processes may endanger desirable performance of PECs. This paper offers holistic insights reliability modeling PECs considering dependencies two simultaneous processes, namely gradual wearing-out degradation and vibration sudden degradation. While individually affect useful lifetime PECs, their mutual...

Void diseases behind the lining can commonly occur in tunnel structures. In this research, failure behavior and reinforcing design of degraded linings with double void were investigated. The effect disease on three-dimensional distribution inner force was explored. Subsequently, stress plastic studied. Then, fiber-reinforced (FRP)-polymer cement mortar (PCM) method concerned. Finally, potential...

RAID5 (resp. RAID6) are two popular RAID designs, which can tolerate one (resp. two) disk failures, but the load of surviving disks doubles (resp. triples) when failures occur. Clustered RAID5 (resp. RAID6) disk arrays utilize a parity group size G, which is smaller than the number of disks N , so that the redundancy level is 1/G (resp. 2/G). This enables the array to sustain a peak throughput ...

Land degradation continues to be an enormous challenge human societies, reducing food security, emitting greenhouse gases and aerosols, driving the loss of biodiversity, polluting water, undermining a wide range ecosystem services beyond supply water climate regulation. Climate change will exacerbate several processes. Investment in diverse restoration efforts, including sustainable agricultura...

For many practical systems that are required to perform critical tasks, it is commonly observed tasks can be performed multiple times within a limited time improve task success probability. Such property referred as redundancy. This paper contributes by studying the optimal adaptive maintenance and abort strategies of continuously degraded considering two kinds redundancy system safety reliabil...