نتایج جستجو برای: aging of materials
تعداد نتایج: 21203454 فیلتر نتایج به سال:
The surface degradation of composite resins caused by accelerated aging was studied. Accelerated aging for 900 hours caused erosion of the resin matrices and exposure of filler particles. Differences in surface profiles after aging suggest that the materials eroded at different rates. Accelerated aging may model erosive wear of composites.
objectives: the aim of this study was to compare the quality of life and mental health, among the elderly people who were living in nursing homes and elderly people who were members of retired club of shiraz city. methods & materials: this research was a descriptive cross-sectional study. the sample of study selected among the elderlys living in nursing homes in shiraz city (30 male & 30 female...
Objectives: Successful aging is a positive, inner feeling and satisfaction with the past and present lives. Thus, the study was conducted to determine the predicting factors of the successful aging in a sample of Iranian elderly. Materials and methods: This cross-sectional and descriptive-analytic study was conducted on 291 elderly people in Qazvin in 2018 selected using two-stage cluster samp...
methodology non-native participants in this study were sixty ba students majoring in english literature and teaching english as a foreign language at khayyam university of mashhad. they were senior students, between 21 to 24 years old, who had studied english for at least three and a half years and had passed several courses including grammar, reading, conversation, and writing. this was assum...
Background and Aim: The recently emerged symptoms of population aging have raised serious concerns in some developed countries. A recent report by the United Nations (UN) indicates that aging is more rapidly growing and is even more serious in developing countries than it is in certain other countries. Therefore, this study is aimed to determine the impression of aging on non-oil economic g...
Background and Aim: This study evaluated the effect of hydrothermal aging on opti-cal and mechanical properties of opaque and translucent zirconia. Materials and Methods: For the biaxial flexural strength (BFS) test, 40 sintered opaque and translucent disc-shaped zirconia, and for the assessment of surface rough-ness and optical properties, 20 specimens were fabricated and artificially aged in...
background and objectives: in this study, the proteolysis and lipolysis of poosti cheese produced from raw sheep milk in mountainous eastern regions of iran were investigated during 90 days of ripening. materials and methods: sodium dodecyl sulfate polyacrylamide gel electrophoresis for proteolysis (sds-page) and gas chromatography (gc) for free fatty acids (ffas) were applied to investigate th...
Objectives The study aimed at performing a comparative analysis of the aging population in European and Asian countries during 1950 and 2015. Methods & Materials This study has been conducted through a secondary analysis, and the data for 90 European and Asian countries were derived from the UN Population division. The used statistical method was history of survival analysis. The statistical p...
Background and Objective: Aging is a natural phenomenon which can cause changes in most organs and cells. Numerous mechanisms including oxidative stress and free radical generation is involved in the progression of the aging process. Pomegranate seed oil (PSO), has different therapeutic properties including anti-oxidant and anti-inflammatory effects. In this research, the effect of PSO against ...
Objectives Considering the migration age pattern and the aging trend in Iran, this study aims to investigate the migration effect on the aging spatial distribution of the country during 2006-2016. Methods & Materials This study is a secondary and descriptive-analytical analysis. The source used is the data of the general population and housing census and the analysis unit is the counties of th...
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