API 510 (Pressure Vessel Inspection Code: In-service Inspection, Rating, Repair, and Alteration)TENTH EDITION, 2014
استاندارد بازرسی مخازن تحت فشار
Objective: To investigate the impact of training the elderly to use the Internet in order to become more active in their health care. Methods: This study utilized semi-structured interviews and surveys. Results: Five themes emerged from the interviews that described participants' motivations and barriers they experienced when using the Internet. Survey data revealed that levels of computer anxiety decreased and levels of efficacy increasing after training. Conclusion: Training the elderly to use the Internet lowered levels of computer anxiety. In addition, participants used the information retrieved from the Internet to become more active in their own health care.
بررسی ارتباط انتظارات زناشویی با خشنودی زناشویی
پایان نامه سال 2009 دکتری خانواده و علوم اجتماعی
185صفحه کاملا جدید و موضوعی تاپ ویژه دانشجویان روانشناسی و مشاوره
استاندارد شیرها در صنعت نفت و گاز
استاندارد B16.34-2013 (Valves — Flanged, Threaded, and Welding End)
Abstract
Selection bias is caused by preferential exclusion of units from the samples and represents a major obstacle to valid causal and statistical inferences; it cannot be removed by randomized experiments and can rarely be detected in either experimental or observational studies. In this paper, we
provide complete graphical and algorithmic conditions for
recovering conditional probabilities from selection biased
data. We also provide graphical conditions for recoverability
when unbiased data is available over a subset of the variables.
Finally, we provide a graphical condition that generalizes
the backdoor criterion and serves to recover causal effects
when the data is collected under preferential selection.