Background: Nowadays we are facing significant advances in technology. Virtual reality, which is considered as one of these novel technologies, has been entered into many different areas of our lives, from video games to various industrial uses as well as education, travel, healthcare, entertainment and research. Despite the benefits of virtual reality, the attitudes of patients toward using it are still unclear. Therefore, the aim of this study was to design a questionnaire to assess accepting virtual reality technology among patients with mental disorders. Methods: This design and evaluation of tools study was conducted in two phases including design of the questionnaire and evaluating its validity and reliability in 1400. In this study, CVR and CVI coefficients were used to evaluate the content validity and its external reliability was determined using Cronbach's alpha method. Results: In the current study, the content validity index was calculated to be 0. 8, which is an acceptable value for this questionnaire. Also, Cronbach's alpha was calculated to be 0. 7 and the correlation between the questions shown to be acceptable at a significant level of 0. 0001 Conclusions: According to the results, it was found that the questionnaire has high validity and reliability to assess the acceptance of virtual reality technology among patients with mental disorders.

This study deals with the application of the Microsoft Excel for the estimation of the power requirements of some tillage implements. The mathematical formulas embedded in the spreadsheet file have been developed in the previously published papers; however, those formulas were augmented herein in order to contain some agricultural mechanization issues. Another feature of this article is the ability of the spreadsheet to generate trend curves automatically. The comparison of the power expenditure aspects of different tillage implements as well as the inspection of the effect of an arbitrary selected input parameter on the spreadsheet outputs were effectively performed. Numerically, the specific work of the rotary tiller was estimated two times to five times higher than the specific work of drawing implements. Furthermore, as an example of trend curves derived in this article, the increase in disc angle in the range of 25° to 70° reduced the draft and power needs of the disc plow by 66% and 54%, respectively. However, it increased the disc plow specific draft and power by 34% and21%, respectively.

Demographic parameters such as intrinsic rate of increase estimates are of main interest in a wide range of ecological researches. Two widely used uncertainty estimate techniques are bootstrap and jackknife methods.Bootstrap estimates are time-consuming processes that are impossible to use without a computer program. Unfortunately few programs, if any, have been developed for this task. In this study a guideline was offered to prepare a program in Microsoft Excel environment to carry out time-consuming calculations of reproductive life table data in a minute or two by repeatedly pressing a shortcut key.