The current trends of product customization and repair of high value parts with individual defects demand automation and a high degree of flexibility of the involved manufacturing process chains. To determine the corresponding requirements this paper gives an overview of manufacturing process chains by distinguishing between horizontal and vertical process chains. The established way of modeling and programming processes with CAx systems and existing approaches is shown. Furthermore, the different types of possible adaptions of a manufacturing process chain are shown and considered as a cascaded control loop. Following this it is discussed which key requirements of repair process chains are unresolved by existing approaches. To overcome the deficits this paper introduces repair features which comprise the idea of geometric features and defines analytical auxiliary geometries based on the measurement input data. This meets challenges normally caused by working directly on reconstructed geometries in the form of triangulated surfaces which are prone to artifacts. Embedded into function blocks, this allows the use of traditional approaches for manufacturing process chains to be applied to adaptive repair process chains
Background: The erythrocyte ratio of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) over total fatty acids, the omega-3 index (O3I), has been suggested as an overall health marker and to motivate corporate health recommendations. We set out to assess the O3I status in a working population, the differences between normal and rotating shift employees, the consumption of omega-3 rich food and whether recommendations to increase intake of omega-3 rich foods can improve the O3I. Methods: Employees registered for their occupational health check-up were offered to participate in a pre-post study at the Ludwigshafen (Germany) site including an assessment of their O3I at baseline and after 4 months (follow-up) and two subsequent food frequency questionnaires. For those with O3I below 8%, a recommendation was provided to increase the intake of omega-3 fatty acid rich food and to take advantage of the employees’ catering service with its enhanced fatty seafood offer during the study period. Dietary intake of EPA and DHA, erythrocyte fatty acid profiles, clinical and lifestyle parameters were assessed. Results: In 500 employees (26.6% female, 21–64 years, median age: 47 years [IQR: 37–53]), at baseline the overall mean O3I was 4.1 ± 1.1% (99.6% of O3I assessed were below 8%), higher in women, in participants with “normal” body weight, upper employment grade, and non-smokers, but not different between regular and rotating shift workers. The three fifths of the cohort also participating in the follow-up increased their EPA and DHA intake by 0.1 g/d and their O3I by 0.5 percentage points. Conclusion: This study provides essential data on omega-3 erythrocyte concentrations in a clinically healthy German working population and the challenges of increasing the O3I with dietary recommendations even in study participants motivated to follow up on their omega-3 status.
Evaluation of an online-based motivation and documentation programme for weight loss. Results of a randomised controlled study Objectives: The objective of the study was to examine whether the use of an online-based motivation and documentation programme leads to weight loss within one year in overweight employees, compared to a control group. Methods: This is a randomised controlled trial conducted from 2018 to 2019 in Ludwigshafen. Members of the intervention and control groups received a measuring tape and a pedometer at the start of the study. Subjects in the intervention group also received access to a website with a motivational programme. At study inclusion, after 6 and 12 months, all study participants received a questionnaire regarding subjective assessment of fitness status, dietary behaviour, and evaluation of the website and pedometer. All study participants also received a monthly newsletter with information on health topics. Results: A total of 279 subjects participated in the study, with information on the primary study endpoint available for 165 (59 %) after 12 months. After 12 months, weight was reduced by 0.73 kg and 1.16 kg in the intervention and control group respectively (mean difference: 0.43 kg; 95% CI: –1.06 kg to 1.92 kg; p = 0.571). Abdominal circumference was reduced by 1.27 cm and 1.74 cm in the intervention and control group respectively (mean difference: 0.47 cm; 95 % CI: –0.96 cm to 1.91 cm; p = 0.521). Regarding subjective assessment of physical activity and dietary behaviour, there were also no statistically significant differences between the groups. Of those who participated in the final survey and, in relation to the website, logged in at least once, the website and pedometer were predominantly rated positively. Conclusions: The study did not show a weight-reducing effect of intervention through the online app. Further studies on digital applications (apps) with adapted or additional functions are needed to evaluate whether they can be a component on the path to desired permanent weight loss in the future. Keywords: randomised controlled trial (RCT) – app – weight loss – fitness
This article presents a method to use CAD/CAM applications as a source of information for the demands the electric drive trains in a specific machine tool have to meet when executing a NC program. The electric drive trains limiting the machine tool dynamic can be identified and possible improvements to these drive trains can be proposed. Furthermore, the knowledge of the dynamic limitations of the machine tool and its electric drives allows to adapt NC programs specifically to this machine tool
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