A Plackett-Burman Design to Optimize Wood Chipper Settings

The wood-chipping process is affected by several factors, notably chipper settings and wood characteristics. It is often difficult to test all of these factors in a full factorial experimental plan, due to the large number of trials required. On the other hand, a screening design of the experiment makes it possible to manage a large number of variables in a small number of trials. Hence, this approach is used to test six factors, in order to optimize the productivity and chip quality of a drum wood-chipper. These factors are: feeding speed, screen size, PTO-speed, wood species, wood moisture content, and wood diameter. Productivity was significantly affected by screen size, while chip quality was related to feeding speed, screen size, PTO-speed, and wood species. The results suggest that the optimal configuration can be achieved by adjusting feeding speed, the PTO-speed, and the wood species, as these settings maximize chip quality. Screen size requires further analysis, as larger sizes increase productivity but reduce quality, while the opposite is true for smaller sizes. Thus, the optimal screen size requires a consideration of costs and benefits that may change according to the retail price of premium and regular wood chips, and production costs

A Plackett-Burman Design to Optimize Wood Chipper Settings

The wood-chipping process is affected by several factors, notably chipper settings and wood characteristics. It is often difficult to test all of these factors in a full factorial experimental plan, due to the large number of trials required. On the other hand, a screening design of the experiment makes it possible to manage a large number of variables in a small number of trials. Hence, this approach is used to test six factors, in order to optimize the productivity and chip quality of a drum wood-chipper. These factors are: feeding speed, screen size, PTO-speed, wood species, wood moisture content, and wood diameter. Productivity was significantly affected by screen size, while chip quality was related to feeding speed, screen size, PTO-speed, and wood species. The results suggest that the optimal configuration can be achieved by adjusting feeding speed, the PTO-speed, and the wood species, as these settings maximize chip quality. Screen size requires further analysis, as larger sizes increase productivity but reduce quality, while the opposite is true for smaller sizes. Thus, the optimal screen size requires a consideration of costs and benefits that may change according to the retail price of premium and regular wood chips, and production costs

Role of Vitamin D in Liver Disease and Complications of Advanced Chronic Liver Disease

Vitamin D is a crucial nutrient with many pleiotropic effects on health and various chronic diseases. The purpose of this review is to provide a detailed report on the pathophysiological mechanisms underlying vitamin D deficiency in patients with chronic liver disease, addressing the different liver etiologies and the condition of advanced chronic liver disease (cirrhosis) with related complications. To date, patients with liver disease, regardless of underlying etiology, have been shown to have reduced levels of vitamin D. There is also evidence of the predictive role of vitamin D values in complications and progression of advanced disease. However, specific indications of vitamin D supplementation are not conclusive concerning what is already recommended in the general population. Future studies should make an effort to unify and validate the role of vitamin D supplementation in chronic liver disease

Online access and motivation of tutors of health professions higher education

The case study of PUNTOZERO as an open web lab for activities, research and support to 5 Master's courses for the health professions is described. A virtual learning environment integrated in a much wider network including social networks and open resources was experimented on for five Master's Courses for the health professions at the University of Parma. A social learning approach might be applied by the engagement of motivated and skilled tutors. This is not only needed for the improvement and integration of the digital and collaborative dimension in higher education, but it aims to introduce issues and biases of emerging e-health and online networking dimensions for future healthcare professionals. Elements of e-readiness to train tutors and improve their digital skills and e-moderation approaches are evident. This emerged during an online and asynchronous interview with two tutors out of the four that were involved, by the use of a wiki where interviewer and informants could both read and add contents and comments

A Plackett-Burman Design to Optimize Wood Chipper Settings

The wood-chipping process is affected by several factors, notably chipper settings and wood characteristics. It is often difficult to test all of these factors in a full factorial experimental plan, due to the large number of trials required. On the other hand, a screening design of the experiment makes it possible to manage a large number of variables in a small number of trials. Hence, this approach is used to test six factors, in order to optimize the productivity and chip quality of a drum wood-chipper. These factors are: feeding speed, screen size, PTO-speed, wood species, wood moisture content, and wood diameter. Productivity was significantly affected by screen size, while chip quality was related to feeding speed, screen size, PTO-speed, and wood species. The results suggest that the optimal configuration can be achieved by adjusting feeding speed, the PTO-speed, and the wood species, as these settings maximize chip quality. Screen size requires further analysis, as larger sizes increase productivity but reduce quality, while the opposite is true for smaller sizes. Thus, the optimal screen size requires a consideration of costs and benefits that may change according to the retail price of premium and regular wood chips, and production costs