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We conduct an analysis of 1835 pledges to 10 music production projects hosted on the largest Brazilian crowdfunding platform, namely the Catarse Web site, and we assess the relation between the fundraising accumulation period, the donor–entrepreneur distance and the propensity of donors to back projects. Our results suggest a significantly negative association between distance and the value of capital pledged to projects, which is consistent with the notion that the entrepreneur’s network of close contacts might play a central role in funding. Furthermore, our results contradict the idea that crowdfunding reduces the inhibiting effect of donor–entrepreneur distance. In addition, the results show that a long project exposure is associated with higher values of pledges. These results suggest practical implications for the study of crowdfunding as a financing platform. This study contributes to the literature on the use of crowdfunding as an alternative funding source in a major emerging market.  相似文献   
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The objective of this study was to determine which chemical treatment used for disinfecting water in indoor swimming pools had the least impact on users' perceptions of health problems, and which generated the greatest satisfaction with the quality of the water. A survey on satisfaction and perceived health problems was given to 1001 users at 20 indoor swimming pools which used different water treatment methods [chlorine, bromine, ozone, ultraviolet lamps (UV) and salt electrolysis]. The findings suggest that there is a greater probability of perceived health problems, such as eye and skin irritation, respiratory problems and skin dryness, in swimming pools treated with chlorine than in swimming pools using other chemical treatment methods. Pools treated with bromine have similar, although slightly better, results. Other factors, such as age, gender, time of day of use (morning and afternoon) and type of user (competitive and recreational), can also affect the probability of suffering health problems. For all of the above, using combined treatment methods as ozone and UV, or salt electrolysis produces a lower probability of perceived health problems and greater satisfaction.  相似文献   
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Both the origin and development of artificial intelligence (AI) are connected with the origin and development of computers. Computers play a very important role in engineering education. AI influences such disciplines like CAD, CASE, CAE, and others. The specific experience concerning AI education at a technical university has been gathered in this paper. There is stressed need of good balance between theoretical background and individual training with computers as well as importance of personal experience in solving practical AI.  相似文献   
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Purpose: This paper demystifies the processes, methodologies and outputs of three co-design projects, identifying how and to what extent are aims and principles of the multi-actor approach realised and upheld in the field. Implications from the cases for participatory principles are discussed.

Design/Methodology/approach: A detailed ethnographic account is presented of three multi-actor co-design cases, supporting diverse readers’ interpretations and learnings.

Findings: Three paradoxes were identifiable from the multi-actor processes: (1) outputs can be orphaned when they lack strong identifiers and affiliations with discrete professional communities outside of the co-design team; (2) combining diverse knowledges co-design can generate outputs that are new and strange (rather than familiar and acceptable) to end-users; (3) for Responsible Research and Innovation, co-creating interventions that are challenging (rather than popular) to society may be required.

Practical implications: Awareness of dynamics and paradoxes arising in the implementation of multi-actor co-design supports enhanced facilitation of processes and impacts of outcomes. Together, the paradoxes highlight the critical importance of communications and engagement initiatives across diverse communities in the aftermath of co-design efforts.

Theoretical implications: Although co-design processes are case-dependent, reflexive accounts of how they play out contribute to the body of knowledge of how co-design may be better understood. The cases in this paper identify paradoxes with implications for principles and theory of multi-actor co-design.

Originality/Value: This paper presents a detailed account of three unique co-design processes. Practical and theoretical implications of the cases are identified.  相似文献   

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Mini-languages are a visually intuitive, simple and powerful way to introduce students to programming. They are a good foundation for general computer science instruction, provide insight into programming for the general population, and teach algorithmic thinking. The goal of the paper is to provide an extensive review of the mini-language approach to teaching programming. For different audiences and in different countries, the authors have extensive experience in design and application of mini-languages. We outline the problems that motivate the application of this approach, present a brief history, review several existing mini-languages, and provide discussion of lessons learned. In particular, we discuss how to choose a mini-language for a particular group of students and list some requirements for a successful application of a mini- language. We conclude with a discussion of possible future directions of the mini-language approach development  相似文献   
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