In collaborative crowdsourcing communities for open innovation, users generate and submit ideas as idea co‐creators. Firms then select and implement valuable ideas for new product development. Despite the popularity and success of these open innovation communities, relatively little is known about the factors that determine the implementation of the user‐generated ideas. Based on research on individual creativity, we propose a conceptual model integrating users' previous experience, idea presentation characteristics and feedback valence to explain the likelihood of idea implementation. We validate our research model with a panel data analysis of 43 550 ideas submitted by 16 360 users in the MIUI new product development community hosted by Xiaomi, a large electronics manufacturing company in China. We find an inverted U‐shaped relationship between users' past successful experience and idea implementation. Furthermore, the length of ideas is positively associated with the likelihood of idea implementation. There is also an inverted U‐shaped relationship between supporting evidence and idea implementation. Finally, we demonstrate the negative effect of positive feedback and the positive effect of negative feedback on idea implementation. These findings offer rich insights to understand the phenomenon of open innovation better. Theoretical and practical implications are discussed.

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The aim of this study was to explore the relationship between social support, self-efficacy, coping style, and psychological stress in children with malignant tumors during the treatment, and to clarify the mediating effects. From May 2019 to August 2019, selected by convenience sampling method, 141 children with malignant tumors in the treatment period were evaluated using the Social Support Questionnaire, General Self-efficacy Scale, Simplified Coping Style Questionnaire, and Depression-Anxiety-Stress Scale. The results of correlation analysis showed that depression was negatively correlated with coping style, self-efficacy, affirmation and support, satisfaction, company, and intimacy, but positively correlated with conflict and punishment; both anxiety and stress were significantly negatively correlated with coping style, self-efficacy, affirmation and support, company, and intimacy. The results of the model indicated that gender, social support, self-efficacy, and coping style could directly predict the psychological stress of children with malignant tumors in the treatment period, social support and self-efficacy could indirectly predict the psychological stress of children with malignant tumors, and the total effect of self-efficacy on the psychological stress of children was the largest. Through 2000 bootstrap tests of mediating effect, it not only confirmed the mediating effect of self-efficacy and coping style but also had a chain-mediating effect. Appropriate social support can improve the self-efficacy of children with malignant tumors in the treatment period and encourage them to take a positive response to the disease, thereby effectively preventing or reducing the occurrence of psychological stress.

International trade of food and feed has facilitated the specialization and agglomeration of agricultural production systems in many countries. Confined animals in specialized production systems are increasingly supplied with soybean and maize, imported from other countries. This has increased animal productivity but has also contributed to spatially decoupled crop and animal production systems. We analyzed the changes in the trade of soybean and maize at the global level in the period 1961-2011, and related these to the changes in livestock density and nutrient balances in the whole food system for 11 selected countries. Export of soybean and maize remained dominated by few countries (mainly USA, Argentina and Brazil) during the period 1961-2011, while the number of importing countries increased. Increases in the import of maize and soybean are positively related with changes in livestock density and N and P balances of national food systems. Imported soybean accounted for 12-36% of the calculated N balance at country level, and imported maize for 0-26%. There were large differences between importing countries; increases in the N surplus ranged from 75 to 306 kg N/ha and in the P surplus from 2 to 49 kg P/ha when the mean livestock density increased 1 LU/ha. This variation is related to differences in nutrient management regulations and to spatial variations in livestock density within countries. Our study contributes to the understanding of the complex relationships between the international trade of animal feed, livestock density and environmental impacts associated with N and P balances.