This work investigates the effect of long-term environmental exposure on performance composite-to-metal bonded joints. Specimens are manufactured using a carbon-fiber reinforced polymer (CFRP) co-bonded to steel member with epoxy adhesive and aged in salt spray chamber. The mixed-mode fracture behavior non-aged specimens is assessed bending (MMB) test apparatus. energy calculated finite element...

During consolidation process of saturated cohesive soil the soil stiffness increases. Increase of the effective stress due to dissipation of excess pore pressure causes additional stiffness of soil mass. This phenomenon has a very important effect on the behavior of saturated cohesive soils during dynamic loading. In the current investigation the changes in maximum shear modulus. Gmax and dampi...

Ageing is a complex process and a broad spectrum of physical, psychological, and social changes over time. Accompanying diseases and disabilities, which can interfere with cancer treatment and recovery, occur in old ages. MicroRNAs (miRNAs) are a set of small non-coding RNAs, which have considerable roles in post-transcriptional regulation at gene expression level. In this review, we attempted ...

Aging and death are two natural consequences to which the human individuals are subject after their birth. Improvement in both social living conditions and health care has led to a greater life span in the world 1, resulting in an increase in periodontal disease expectancy among the dentate elderly 2. Although moderate loss of both alveolar bone and periodontal attachment is common in the elder...

Problem: Genetic and demographic studies suggest that ageing is an adaptive genetic program, but population genetic analysis indicates that the benefit of ageing to the group is too slow and too diffuse to offset its individual cost. Premise: Demographic homeostasis is a major target of natural selection at the group level, with a strength that can compete with the imperative to higher individu...

Ageing is a complex multifactorial process involving a progressive physiological decline that, ultimately, leads to the death of an organism. It involves multiple changes in many components that play fundamental roles under healthy and pathological conditions. Simultaneously, every organism undergoes accumulative 'wear and tear' during its lifespan, which confounds the effects of the ageing pro...

The kinetics of ageing of normal mouse embryo fibroblast cells in culture have been determined. The growth pattern during every passage was established. It was observed that the growth pattern was not exponential, but that the growth rate declined progressively both within and with every passage. We also estimated the cell cycle parameters using the Fraction of Labelled Mitoses method at every ...