In this paper, a computational model of fuzzy reliability focusing on solving the engineering problems with random general stress–fuzzy general strength is presented. The mathematical basis of this computational model is that the fuzzy probability can be computed with the computational method of conventional probability by use of a mathematical transition. Based on this computational model, a n...

Leaded solder ball was replaced by leadfree solder ball which is now widely used in semiconductor industries, due to the hazardous effects of lead to human’s health and toxicity for environment. Due to this, poor solder joint strength for Ball Grid Array (BGA) packages on leadfree devices is a reliability concern when subjected to reliability stress test. With a polymer core in the solder ball ...

The reliability and failure modes of molar crowns supported by three different implant-supported designs were tested according to the following groups: group 1, one standard-diameter implant (3.75 mm); group 2, one narrow-diameter implant (3 mm); and group 3, two narrow-diameter implants (3 mm). Loads were applied as mouth-motion cycles using a step-stress accelerated life-testing method. ? val...

AIMS The first choice treatment in urinary incontinence (UI) is rehabilitation of the pelvic floor in order to improve muscle strength. However, no entirely reliable instruments for quantifying pelvic floor muscle (PFM) strength are currently available. Our aim was to test the intra-rater reliability and diagnostic accuracy of a new vaginal dynamometer for measuring PFM strength. METHODS Test...

stress-corrosion cracking (scc) tests were conducted in the near-neutral ph standard solution, ns4, and in an actual soil solution, using four-point bending at a high stress ratio and low frequency conditions very similar to those of operational pipelines. pitting incubation appeared first and then pitting initiated and grew in both solutions although there were many more pits on the specimen t...

The problem discussed here has arisen from an industrial scenario involving the potential failure of an element of building structures. The element carries with it a warranty of several years. The scenario considered is not specific to buildings and occurs under other circumstances; it goes under the label “product stewardship.” Its statistical content, however, is inference from accelerated te...

conclusions the analysis of the reliability and validity of the persian version of the hse questionnaire showed that it is a useful and reliable measure to analyze work-related stress. background job stress has recently been regarded as a risk factor for some diseases. objectives in this study, we standardized the persian version of the hse management standards indicator tool and studied the ps...

aim and background: the aim of current study was to investigate the factor structure, reliability, and validity of parenting stress index-short form (psi-sf) among tehran city's mothers with 7-12 year-old children. methods and materials: after translation, back translation and adaptation of instrument, due to normalization this instrument by applied survey design, 468 mothers from those which s...