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Lead-free piezoelectric materials and composites for high power density energy harvesting
Maurya, Deepam,Peddigari, Mahesh,Kang, Min-Gyu,Geng, Liwei D.,Sharpes, Nathan,Annapureddy, Venkateswarlu,Palneedi, Haribabu,Sriramdas, Rammohan,Yan, Yongke,Song, Hyun-Cheol,Wang, Yu U.,Ryu, Jungho,Pri Published for the Materials Research Society by th 2018 Journal of materials research Vol.33 No.16
<▼1><B>Abstract</B><P/></▼1><▼2><P>In the emerging era of Internet of Things (IoT), power sources for wireless sensor nodes in conjunction with efficient and secure wireless data transfer are required. Energy harvesting technologies are promising solution toward meeting the requirements for sustainable power sources for the IoT. In this review, we focus on approaches for harvesting stray vibrations and magnetic field due to their abundance in the environment. Piezoelectric materials and piezoelectric-magnetostrictive [magnetoelectric (ME)] composites can be used to harvest vibration and magnetic field, respectively. Currently, such harvesters use modified lead zirconate titanate (or lead-based) piezoelectric materials and ME composites. However, environmental concerns and government regulations require the development of a suitable lead-free replacement for lead-based piezoelectric materials. In the past decade, several lead-free piezoelectric compositions have been developed and demonstrated with promising piezoelectric response. This paper reviews the significant results reported on lead-free piezoelectric materials with respect to high-density energy harvesting, covering novel processing techniques for improving the piezoelectric response and temperature stability. The review of the state-of-the-art studies on vibration and magnetic field harvesting is provided and the results are used to discuss various strategies for designing high-performance energy harvesting devices.</P></▼2>
Broadband dual phase energy harvester: Vibration and magnetic field
Song, Hyun-Cheol,Kumar, Prashant,Sriramdas, Rammohan,Lee, Hyeon,Sharpes, Nathan,Kang, Min-Gyu,Maurya, Deepam,Sanghadasa, Mohan,Kang, Hyung-Won,Ryu, Jungho,Reynolds Jr., William T.,Priya Jr., Shashank Elsevier 2018 APPLIED ENERGY Vol.225 No.-
<P><B>Abstract</B></P> <P>Broadband mechanical energy harvesting implies stable output power over a wide range of source frequency. Here we present a cost-effective solution towards achieving broadband response by designing a magnetically coupled piezoelectric energy harvester array that exhibits a large power density of 243 μW/cm<SUP>3</SUP> g<SUP>2</SUP> at natural frequency and bandwidth of more than 30 Hz under 1 g acceleration. The magnetically coupled piezoelectric energy harvester array exhibits dual modes of energy harvesting, responding to both stray magnetic field as well as ambient vibrations, and is found to exhibit the output power density of 36.5 μW/cm<SUP>3</SUP> Oe<SUP>2</SUP> at 79.5 Hz under the ambient magnetic field while maintaining the broadband nature. The magnetically coupled piezoelectric energy harvester array was demonstrated to harvest continuous power from a rotary pump vibration, an automobile engine vibration and a parasitic magnetic field surrounding a cable of an electric kettle. These demonstrations suggest that the magnetically coupled piezoelectric energy harvester array could serve the role of a standalone power source for wireless sensor nodes and small electronic devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Magnetically coupled energy harvester array is demonstrated for broadband operation. </LI> <LI> Energy harvester provides dual mode energy harvesting in magnetic field and vibration. </LI> <LI> Energy harvester exhibits 243 μW/cm<SUP>3</SUP> g<SUP>2</SUP> power density and over 30 Hz bandwidth. </LI> <LI> Energy harvester is implemented in practical environments of a rotary pump, power cable, and car engine. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
( Matthew Sharp ),( Jacob Wilson ),( Matthew Stefan ),( Raad Gheith ),( Ryan Lowery ),( Charlie Ottinger ),( Dallen Reber ),( Cemal Orhan ),( Nurhan Sahin ),( Mehmet Tuzcu ),( Shane Durkee ),( Zainula 한국운동영양학회 2021 Physical Activity and Nutrition (Phys Act Nutr) Vol.25 No.1
[Purpose] This study investigated the effects of marine phytoplankton supplementation (Oceanix®, Tetraselmis chuii ) on 1) maximal isometric strength and immune function in healthy humans following a one-week high-intensity resistance-training program and 2) the proinflammatory cytokine response to exercise in a rat model. [Methods] In the human trial, 22 healthy male and female participants were randomly divided into marine phytoplankton and placebo groups. Following baseline testing, participants underwent a 14-day supplement loading phase before completing five consecutive days of intense resistance training. In the rat model, rats were randomly divided into four groups (n=7 per condition): (i) control, (ii) exercise, (iii) exercise + marine phytoplankton (2.55 mg/kg/day), or (iv) exercise + marine phytoplankton (5.1 mg/kg/day). Rats in the exercising groups performed treadmill exercise 5 days per week for 6 weeks. [Results] In the human model, marine phytoplankton prevented significant declines in the isometric peak rate of force development compared to placebo. Additionally, salivary immunoglobulin A concentration was significantly lower following the resistance training protocol in the placebo group but not in the marine phytoplankton group. Marine phytoplankton in exercising rats decreased intramuscular levels and serum concentrations of tumor necrosis factor-alpha (TNF-α) and interleukin-1 beta (IL-1β) and intramuscular concentrations of malondialdehyde. [Conclusion] Marine phytoplankton prevented decrements in indices of functional exercise recovery and immune function. Mechanistically, these outcomes could be prompted by modulating the oxidative stress and proinflammatory cytokine response to exercise.
Stirling Sharpe 글로벌지식마케팅경영학회 2018 Journal of Global Sport Management Vol. No.
The increasing commercialism of sport has been accompanied by pressure for sport organizations to become (more) professional. The kitchen table or boardroom approaches that may be ingrained in accepted values within organizations are being challenged by contemporary business principles of sport organization governance. While considerable work has been conducted under the banner of the professionalization of sport, there has been limited research addressing the ongoing professionalization of organizations which have already moved away from being volunteer based and are operating in a business-like manner. This research provides a case study of the ACT Brumbies rugby union club in Australia addressing this issue with interviews conducted within three key stakeholder groups of this organization: Board members, operations staff, and players. Semi-structured interviews were conducted with a purposive sample of twelve stakeholders. Results indicated that the ongoing professionalization process had differing impacts on operations for various employees.