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- 저자 : ( Madan G Saha ) (검색결과 2 건)
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Limit speeds and stresses in power law functionally graded rotating disks
Madan, Royal,Saha, Kashinath,Bhowmick, Shubhankar Techno-Press 2020 Advances in materials research Vol.9 No.2
Limit elastic speed analysis of Al/SiC-based functionally graded annular disk of uniform thickness has been carried out for two cases, namely: metal-rich and ceramic rich. In the present study, the unknown field variable for radial displacement is solved using variational method wherein the solution was obtained by Galerkin's error minimization principle. One of the objectives was to identify the variation of induced stress in a functionally graded disk of uniform thickness at limit elastic speed using modified rule of mixture by comparing the induced von-Mises stress with the yield stress along the disk radius, thereby locating the yield initiation. Furthermore, limit elastic speed has been reported for a combination of varying grading index (n) and aspect ratios (a/b).Results indicate, limit elastic speed increases with an increase in grading indices. In case of an increase in aspect ratio, limit elastic speed increases up to a critical value beyond which it recedes. Also, the objective was to look at the variation of yield stress corresponding to volume fraction variation within the disk which later helps in material tailoring. The study reveals the qualitative variation of yield stress for FG disk with volume fraction, resulting in the possibility of material tailoring from the processing standpoint, in practice.
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( Su Shian Lee ),( Stephanie Ward ),( Madan G Saha ) 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1
Background: Elderly people experience a high prevalence of insomnia and poor sleep quality. Though the risks of hypnosedatives are well documented in this population, its use is highly prevalent. This paper provides an overview of non-pharmacological strategies available, and their evidence of effectiveness for the treatment of insomnia in the elderly. Methods: A literature search was performed using electronic searches on Medline, PsychINFO, EMBASE, Pubmed and the Cochrane library databases from 1995 till 2014. Relevant publications were also sought from citations and through manual searches of review articles. Search limiters were age above 60 years and English language. Key meta-analyses, systematic reviews, interventional and observational studies were identifi ed, reviewed, and available evidences summarized. Results: To improve symptoms of insomnia, there is evidence to suggest that in cognitively intact people, cognitive behavioural therapy (CBT) is effective. This review revealed confi icting evidence in regards to the effectiveness of physical exercises, bright light therapy and thermal manipulations for the treatment of insomnia. In residential care facilities, noise reduction strategy as a stand-alone therapy for insomnia was not effective but minimizing nocturnal interventions such as incontinence and pressure care, reduced night-time sleep disruptions. Conclusion: With the exception of CBT, there is currently limited evidence to suggest that bright light therapy, physical exercises and thermal manipulation are effective for treatment of insomnia in the elderly. This is due to small number of studies, small sample sizes, short follow-up, and strict patient selection criteria in reviewed studies. However, given its lack of adverse effects in contrast to hypnosedatives, non-pharmacological interventions may be considered as the fi rst line intervention for insomnia in the elderly.
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