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Energy harvesting textiles for a rainy day:woven piezoelectrics based on melt-spun PVDF microfibres with a conducting core

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npj Flexible Electronics 2018年第1期2卷 67-75页

作者： anja lund Karin Rundqvist Erik Nilsson Liyang Yu Bengt Hagstrom Christian Muller Department of Chemistry and Chemical Engineering Chalmers University of TechnologyGöteborg 41296Sweden The Swedish School of Textiles University of BorasBoras 50190Sweden Department of Materials Swerea IVFBox 104Mölndal 43122Sweden Department of Industrial and Materials Science Chalmers University of TechnologyGoteborg 41296Sweden

Recent advances in ubiquitous low-power electronics call for the development of light-weight and flexible energy *** textile format is highly attractive for unobtrusive harvesting of energy from e.g.,biomechanical ***,we report the manufacture and characterisation of fully textile piezoelectric generators that can operate under wet *** use a weaving loom to realise textile bands with yarns of melt-spun piezoelectric microfibres,that consist of a conducting core surrounded byβ-phase poly(vinylidene fluoride)(PVDF),in the warp *** core-sheath constitution of the piezoelectric microfibres results in a—for electronic textiles—unique *** inner electrode is fully shielded from the outer electrode(made up of conducting yarns that are integrated in the weft direction)which prevents shorting under wet *** a result,and in contrast to other energy harvesting textiles,we are able to demonstrate piezoelectric fabrics that do not only continue to function when in contact with water,but show enhanced *** piezoelectric bands generate an output of several volts at strains below one *** show that integration into the shoulder strap of a laptop case permits the continuous generation of four microwatts of power during a brisk *** promising performance,combined with the fact that our solution uses scalable materials and well-established industrial manufacturing methods,opens up the possibility to develop wearable electronics that are powered by piezoelectric textiles.

关键词： piezoelectric harvesting electrode

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Highly insulating thermoplastic blends comprising a styrenic copolymer for direct‐current power cable insulation

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High Voltage 2022年第2期7卷 251-259页

作者： Yingwei Ouyang Amir Masoud Pourrahimi IdaÖstergren Marcus Mellqvist JakobÅnevall Azadeh Soroudi anja lund Xiangdong Xu Thomas Gkourmpis Per‐Ola Hagstrand Christian Müller Department of Chemistry and Chemical Engineering Chalmers University of TechnologyGöteborgSweden Department of Electrical Engineering Chalmers University of TechnologyGöteborgSweden Innovation&Technology Borealis ABStenungsundSweden

The impact of the composition of blends comprising low‐density polyethylene(LDPE),isotactic polypropylene(PP)and a styrenic copolymer additive on the thermomechanical properties as well as the direct‐current(DC)electrical and thermal conductivity is *** presence of 5 weight percent(wt%)of the styrenic copolymer strongly reduces the amount of PP that is needed to enhance the storage modulus above the melting temperature of LDPE from 40 to 24 wt%.At the same time,the copolymer improves the consistency of the thermomechanical properties of the resulting ternary *** both the DC electrical and thermal conductivity strongly decrease with PP content,the addition of the styrenic copolymer appears to have little influence on either ***,PP in combination with small amounts of a styrenic copolymer not only allows to reinforce LDPE at elevated temperatures but also functions as an electrical conductivity‐reducing additive,which makes such thermoplastic ternary formulations possible candidates for the insulation of high‐voltage power cables.

关键词： property. blends copolymer

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Performance analysis of deep borehole heat exchangers for decarbonization of heating systems

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Deep Underground Science and Engineering 2024年第3期3卷 349-357页

作者： Andreas E.D.lund Department of Electrical Engineering and Automation Aalto UniversityEspooFinland

Meeting the climate change mitigation targets will require a substantial shift from fossil to clean fuels in the heating *** pumps with deep borehole exchangers are a promising solution to reduce *** the thermal behavior of deep borehole exchangers(DBHEs)ranging from 1 to 2 km was analyzed for various heat flow profiles.A strong correlation between thermal energy extraction and power output from DBHEs was found,also influenced by the heating profile *** operating time over the year typically resulted in higher energy production,while shorter one yielded higher average thermal power output,highlighting the importance of the choice of heating strategy and system design for optimal performance of *** breaks in operation for regenerating the borehole,for example,with waste heat,proved to be favorable for the performance yielding an overall heat output close to the same as with continuous extraction of *** results demonstrate the usefulness of deep boreholes for dense urban areas with less available *** the heat production from a single DBHE in Finnish conditions ranges from half up to even a few GWh a year,the technology is best suitable for larger heat loads.

关键词： clean energy deep borehole exchangers energy transition geothermal heat ground-coupled heat pump

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Comparisons and optimization of two absorption chiller types by considering heat transfer area,exergy and economy as single-objective functions

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Clean Energy 2024年第1期8卷 55-65页

作者： Yida Qiu Jingkun Wang Jing Han Yuzhu Chen Jun Wang Peter D.lund Management School University of LiverpoolLiverpool L693BXUK Power China Huadong Engineering Corporation Limited No.201 Gaojiao RoadHangzhou 311122China Key Laboratory of Solar Energy Science and Technology in Jiangsu Province Southeast UniversityNo 2 Si Pai LouNanjing210096China School of Science Aalto UniversityPO Box 15100FI-00076Aalto(Espoo)Finland

Absorption cooling technology is an environmentally friendly method to generate continuous chilled water making use of multiple thermal sources,such as waste heat and renewable thermal *** this study,two absorption chillers(nominal capacity of 400 kW)with series and parallel connections are *** research the ideal configuration of chillers after thermodynamic analysis,the structures of the chillers are optimized using the particle swarm optimization algorithm by considering the heat transfer area(HTA),exergy efficiency and total annual cost as single-objective *** impact of temperature differences between external and internal flows,heat exchanger efficiencies and the solution allocation ratio is *** optimized HTA,coefficient of perform-ance,exergy efficiency and total annual cost are 149.0 m^(2),1.56,29.44%and$229119 for the series-connected chiller,and 146.7 m^(2),1.59,31.45%and$234562 for the parallel-connected type,*** the lowest HTA condition,compared with the reference simulation results,the energy and exergy performances are improved,while the annual total cost is *** annual total cost is highest when maximizing the exergy efficiency,which is attributed to the increase in the *** operating cost accounts for 27.42%(series type)and 26.54%(parallel type)when the annual cost is the lowest.

关键词： absorption chiller series/parallel-connected temperature difference parameters solution allocation ratio

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Cancer-associated fibroblasts express CD1d and activate invariant natural killer T cells under cellular stress

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Cellular & Molecular Immunology 2024年第1期21卷 91-94页

作者： Shengduo Pei Jonas Sjölund Yueyun Pan Kristian Pietras Mikael C.I.Karlsson Department of Microbiology Tumor and Cell BiologyKarolinska InstitutetStockholmSweden Division of Translational Cancer Research Department of Laboratory MedicineLund University Cancer CentreLund UniversityLundSweden

Invariant natural killer T(iNKT)cells are part of the family of unconventional T cells,and they recognize glycolipid antigens presented on the MHC class I like molecule CD1^([1]).In humans there are five CD1 molecules named CD1a to CD1e,whereas mice use only CD1d for lipid ***,iNKT cells can elicit both cytotoxicity similarly to conventional CD8 T cells and secrete cytokines that influence the adaptive immune response including providing direct T cell help to B cells^([2]).In the context of tumors,they can use both release of granzyme B and use Fas-mediated mechanisms for killing of tumor *** iNKT cells use a restricted TCR repertoire and CD1 molecules are non-heterogenous the risk of graft vs host disease is limited and thus these T cells have been an attractive option for off the shelf immunotherapy to treat cancer^([3]).

关键词： killer CD1d Cancer

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Highly Active Interfacial Sites in SFT-SnO_(2) Heterojunction Electrolyte for Enhanced Fuel Cell Performance via Engineered Energy Bands:Envisioned Theoretically and Experimentally

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Energy & Environmental Materials 2024年第3期7卷 384-397页

作者： Sajid Rauf Muhammad Bilal Hanif Faiz Wali Zuhra Tayyab Bin Zhu Naveed Mushtaq Yatao Yang Kashif Khan Peter D.lund Martin Motola Wei Xu College of Electronic and Information Engineering and State Key Laboratory of Radio frequency Heterogeneous Integration Shenzhen UniversityShenzhen 518000China Department of Inorganic Chemistry Faculty of Natural SciencesComenius University in BratislavaIlkovicova 684215BratislavaSlovakia College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China School of Energy and Environment Southeast UniversityNo.2 Si Pai LouNanjing 210096China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China New Energy Technologies Group Department of Applied PhysicsAalto University School of ScienceP.O.Box 15100Fl-00076AaltoEspoo Finland

Extending the ionic conductivity is the pre-requisite of electrolytes in fuel cell technology for high-electrochemical *** this regard,the introduction of semiconductor-oxide materials and the approach of heterostructure formation by modulating energy bands to enhance ionic conduction acting as an electrolyte in fuel ***(n-type;SnO_(2))plays a key role by introducing into p-type SrFe_(0.2)Ti_(0.8)O_(3-δ)(SFT)semiconductor perovskite materials to construct p-n heterojunction for high ionic ***,two different composites of SFT and SnO_(2)are constructed by gluing p-and n-type SFT-SnO_(2),where the optimal composition of SFT-SnO_(2)(6∶4)heterostructure electrolyte-based fuel cell achieved excellent ionic conductivity 0.24 S cm^(-1)with power-output of 1004 mW cm^(-2)and high OCV 1.12 V at a low operational temperature of 500℃.The high power-output and significant ionic conductivity with durable operation of 54 h are accredited to SFT-SnO_(2)heterojunction formation including interfacial conduction assisted by a built-in electric field in fuel cell ***,the fuel conversion efficiency and considerable Faradaic efficiency reveal the compatibility of SFT-SnO_(2)heterostructure electrolyte and ruled-out short-circuiting ***,the first principle calculation provides sufficient information on structure optimization and energy-band structure modulation of SFT-SnO_(2).This strategy will provide new insight into semiconductor-based fuel cell technology to design novel electrolytes.

关键词： high ionic conductivity interfacial conduction modulated energy band structure p-n heterojunction semiconductors

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基于主从博弈的燃气-太阳能-地热能耦合系统运行优化

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太阳能学报 2024年第7期45卷 333-339页

作者：李昌杰陈玉柱秦方李贤培王军 lund Peter 江苏省太阳能技术重点实验室东南大学能源与环境学院南京210096 中国电建集团华东勘测研究院有限公司杭州311122 芬兰阿尔托大学科学学院艾斯堡FI-00076

为提高能源利用率与经济性,提出一种基于博弈论中主从博弈的燃气-太阳能-地热能集成综合能源系统优化运行策略。首先建立综合能源系统模型,将其嵌套入博弈理论的框架下,建立主从博弈的运行优化模型,将能源聚合商作为领导者,综合能源系... 详细信息

为提高能源利用率与经济性,提出一种基于博弈论中主从博弈的燃气-太阳能-地热能集成综合能源系统优化运行策略。首先建立综合能源系统模型,将其嵌套入博弈理论的框架下,建立主从博弈的运行优化模型,将能源聚合商作为领导者,综合能源系统和负荷终端用户作为跟随者,在各方追逐目标最优时实现经济性、环保性和节约性。最后通过算例验证了所提方法的有效性,聚合商、供能系统和终端用户均能实现最优的综合性能。

关键词：电力负荷调度分布式能源博弈论综合能源系统运行优化

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生成式人工智能时代学术信息失序问题治理研究——以ChatGPT为例

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机器人产业 2024年第1期 103-108页

作者：聂冰王婷 Brady D.lund 浙江同济科技职业学院图书馆美国恩波利亚州立大学美国北德克萨斯大学

以ChatGPT为代表的生成式人工智能应用是人工智能技术快速发展的自然结果,既为人类社会的学术研究工作带来诸多助力,也提出了学术信息失序这一巨大挑战。生成式人工智能时代学术信息失序问题主要表现为作者署名和版权问题、虚假引用问... 详细信息

以ChatGPT为代表的生成式人工智能应用是人工智能技术快速发展的自然结果,既为人类社会的学术研究工作带来诸多助力,也提出了学术信息失序这一巨大挑战。生成式人工智能时代学术信息失序问题主要表现为作者署名和版权问题、虚假引用问题和学术伦理道德问题。为应对这些问题,国家应不断完善政策法规的监督机制,人工智能行业也应主动承担信息标注和识别的技术发展责任,高校等学术研究机构则应不断加强学术研究人员的信息素养教育,通过以上三方面达成对学术信息失序问题的有效治理。

关键词：人工智能应用人工智能技术信息素养教育学术研究机构学术研究工作伦理道德问题学术信息版权问题

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Biomedical engineering and erectile restoration:design considerations for urologic prosthetics

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Asian Journal of Andrology 2020年第1期22卷 15-19页

作者： Jonathan J lund Prosthetic Urology Research and Development Boston ScientificMinnetonkaMN 55343USA

For patients with moderate-to-severe erectile dysfunction,implantable penile prostheses continue to be a viable *** device developers apply design controls during the development cycle to ensure that a product performs as intended in the final use *** process relies heavily on the principles of systems engineering and documents every facet of performance,unmet need,and *** better understand design philosophy,it is important to frame benchmarked performance outcomes in the context of the ideal *** consideration of erectile anatomy and physiology,including flaccid state,transitional phases,and full tumescence,informs penile prosthesis design philosophy and provides the foundation for product advancement.

关键词： design controls engineering fluid dynamics inflatable penile prosthesis systems engineering

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Nevanlinna theory of meromorphic functions on annuli

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Science China Mathematics 2010年第3期53卷 547-554页

作者： lund Mark Department of Mathematics College of DuPage

In this survey paper, we discuss the recent development of Nevanlinna theory of meromorphic functions on annuli, which extends results in Nevanlinna theory in the complex plane or in a disk. In particular, we show that the approach taken on annuli is a unified treatment of functions meromorphic in the complex plane, a disk and an annulus. It allows one to obtain many results in the complex plane and in a disk as corollaries of our results in annuli.

关键词： Nevanlinna theory meromorphic function annulus

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