Towards the noise reduction of piezoelectrical-driven synthetic jet actuators

This paper details an experimental investigation aimed at reducing the noise output of piezoelectrical-driven synthetic jet actuators without compromising peak jet velocity. Specifically, the study considers double-chamber ('back-to-back') actuators for anti-phase noise suppression and corrugated-lobed orifices as a method to enhance turbulent mixing of the jets to suppress jet noise. The study involved the design, manufacture and bench test of interchangeable actuator hardware. Hot-wire anemometry and microphone recordings were employed to acquire velocity and noise measurements respectively for each chamber configuration and orifice plate across a range of excitation frequencies and for a fixed input voltage. The data analysis indicated a 32% noise reduction (20 dBA) from operating a singlechamber, circular orifice SJA to a double-chamber, corrugated-lobed orifice SJA at the Helmholtz resonant frequency. Results also showed there was a small reduction in peak jet velocity of 7% (~3 m/s) between these two cases based on orifices of the same discharge area. Finally, the electrical-to-fluidic power conversion efficiency of the double-chamber actuator was found to be 15% across all orifice designs at the resonant frequency; approximately double the efficiency of a single-chamber actuator. This work has thus demonstrated feasible gains in noise reduction and power efficiency through synthetic jet actuator design

Use of demand for and spatial flow of ecosystem services to identify priority areas

Policies and research increasingly focus on the protection of ecosystem services (ESs) through priority-area conservation. Priority areas for ESs should be identified based on ES capacity and ES demand and account for the connections between areas of ES capacity and demand (flow) resulting in areas of unique demand-supply connections (flow zones). We tested ways to account for ES demand and flow zones to identify priority areas in the European Union. We mapped the capacity and demand of a global (carbon sequestration), a regional (flood regulation), and 3 local ESs (air quality, pollination, and urban leisure). We used Zonation software to identify priority areas for ESs based on 6 tests: with and without accounting for ES demand and 4 tests that accounted for the effect of ES flow zone. There was only 37.1% overlap between the 25% of priority areas that encompassed the most ESs with and without accounting for ES demand. The level of ESs maintained in the priority areas increased from 23.2% to 57.9% after accounting for ES demand, especially for ESs with a small flow zone. Accounting for flow zone had a small effect on the location of priority areas and level of ESs maintained but resulted in fewer flow zones without ES maintained relative to ignoring flow zones. Accounting for demand and flow zones enhanced representation and distribution of ESs with local to regional flow zones without large trade-offs relative to the global ES. We found that ignoring ES demand led to the identification of priority areas in remote regions where benefits from ES capacity to society were small. Incorporating ESs in conservation planning should therefore always account for ES demand to identify an effective priority network for ESs.Peer reviewe

A decade of sulfite control in Serbian meat industry and the effect of HACCP

In total 7,351 meat preparations and fresh processed meat products were analyzed from 555 different Serbian meat producers over a 10 year period, 4½ years before and 5½ years after mandatory HACCP implementation. From the obtained results, it could be concluded that HACCP has contributed to a better alignment of practices with the legal provisions. The share of non-compliant samples dropped from 18.6% before HACCP to 8.3% after its mandatory implementation. Average sulfite concentrations for all categories of meat preparations and fresh processed meat products decreased by 43%, declining from 33.6 mg kg-1 to 19.3 mg kg-1. Typical misuse and frequent abuse of sulfites was independent of a season. Application of HACCP principles in the Serbian meat industry raised awareness about the misuse of sulfites and contributed to a better control, minimizing exposure to sulfites

101 ideas on the future of research and innovation in Europe : messages from RISE Tour d’Europe 2017-2018

Dokumenty Evropského dokumentačního střediskaLuxembour

Perspectives on the role of business in social innovation

Purpose This article examines the conceptual construct of social innovation in business as distinct from social innovation implemented by civil society and the state. The general absence of sustained research and analysis of this phenomenon, and the dominance of grey and policy-oriented literature, mean that a broadly accepted definition of how social innovation theorises the changing role of business in society is missing. Design/methodology/approach We conducted an integrative review of the representative literature on social innovation. The analysis focused on the key arguments made about the involvement of business actors in processes of social innovation and interweaved in this study to build a logically coherent definition of what social innovation in business means for the bulk of those who write and speak about it today. The scope of the literature review was expanded by integrating insights from the extant ‘business in society’ and social innovation literatures, thereby adding clarity to our conceptualisation. Findings The findings indicate that social innovation is best understood as a process driven by human relations, morality and creative capacity breaking routines and path dependencies. It fundamentally relies on the socially constructed dynamics between business and social actors who carry ideas, focus their energies, mobilise competences and create new complementarities to tackle social problems. Economic gain, in this approach, is at best an outcome of social innovation, not its engine. Originality/value: What this literature review unveils that is unique about social innovation, and contributes to an enrichment of the ‘business in society’ debate beyond the business case and win-win scenarios depicted by most scholars in this field, is that it best manifests itself as an informal social process that comes into existence at the margins of conventional ways of thinking and organising business activities. Business actors involved in social innovation are framed as self-directed and self-organised around the moral purpose of fostering social progress

Involving mosques in health promotion programmes: a qualitative exploration of the MCLASS intervention on smoking in the home

Second-hand smoke (SHS) exposure is high among UK Bangladeshi and Pakistani populations, reflecting higher male smoking prevalence and fewer home smoking restrictions than the general population. The Muslim Communities Learning About Second-hand Smoke (MCLASS) study explored the feasibility and acceptability of implementing SHS education in 14 UK mosques. Religious teachers (RTs) in seven intervention mosques were trained and provided with a culturally appropriate educational package. After the intervention, mosque leaders, RTs and congregants’ experiences and perceptions of the intervention were explored through interviews and focus group discussions. Delivery of the intervention varied across mosques. Facilitators and barriers included: mosque diversity (congregation size, organizational structure, educational activities, women’s role and involvement); degree of trust between researchers and personnel; and views on SHS. Most participants thought mosques’ involvement in SHS health promotion was appropriate, but the perceived importance of SHS differed. We found that a health promotion programme delivered within Islamic religious settings that engages RTs in the process of facilitation, can be acceptable and feasible, but care must be taken to explore the culture and ethos of the institution, including its organizational structure, management committee, RTs and congregation

Exports and the Global Crisis: Still Alive, Though not Quite Kicking Yet

This paper describes the severity of the declines of Asian exports during the recent global crisis and provides more detailed information on the hardest hit manufacturing and exporting industries. To do this, we use various sources of data, including Industrial Statistics of the United Nations Industrial Development Organization as well as the latest monthly unemployment and exports data available from official sources. We find severe declines of exports across most product categories, and that the worst-hit sectors often consist of larger, more productive firms relative to other manufacturing sectors. Some of these sectors also employ higher percentages of women workers in countries such as Indonesia and Malaysia. Nonetheless, although official unemployment rose across developing Asia, the level has yet to reach that of OECD countries. In further contrast to the jobless recovery facing some OECD countries, employment shows recent signs of stabilizing and even increasing. Finally, we conclude with a discussion on the recent upward trends in exports. While we see cautious optimism in the revival of exports, data indicates that Asian workers are not clearly out of the woods yet

Methodology and applications of city level CO2 emission accounts in China

China is the world's largest energy consumer and CO2 emitter. Cities contribute 85% of the total CO2 emissions in China and thus are considered as the key areas for implementing policies designed for climate change adaption and CO2 emission mitigation. However, the emission inventory construction of Chinese cities has not been well researched, mainly owing to the lack of systematic statistics and poor data quality. Focusing on this research gap, we developed a set of methods for constructing CO2 emissions inventories for Chinese cities based on energy balance table. The newly constructed emission inventory is compiled in terms of the definition provided by the IPCC territorial emission accounting approach and covers 47 socioeconomic sectors, 17 fossil fuels and 9 primary industry products, which is corresponding with the national and provincial inventory. In the study, we applied the methods to compile CO2 emissions inventories for 24 common Chinese cities and examined uncertainties of the inventories. Understanding the emissions sources in Chinese cities is the basis for many climate policy and goal research in the future