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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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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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Bibliometrics Is Valuable *** Do Some Journals Seem to Oppose It?

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Journal of Data and Information Science 2022年第3期7卷 1-4页

作者： Brady lund Emporia State University 1 Kellogg CircleEmporiaKansas 66801-2523U.S.

Of all forms of research that can be accepted as valuable investigations,bibliometrics is often thought to be one of the most accessible to the widest number of *** methods like interviewing and ethnography require extensive training,time,and often need ethical *** basic quantitative methods like using questionnaires require significant drafting,mastery of language,and ethical ***,being based on the analysis of publicly-available bibliographic data,does not have these *** with these other research approaches,where the top software(e.g.,SPSS,NVIVO)are expensive for researchers to afford.

关键词： approval interview Bibliometrics

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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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Concurrent multi-scale design optimization of composite frame structures using the Heaviside penalization of discrete material model

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Acta Mechanica Sinica 2016年第3期32卷 430-441页

作者： Jun Yan Zunyi Duan Erik lund Guozhong Zhao Dalian University of Technology Dalian 116024 China Aalborg University 9220 Aalborg Denmark

This paper deals with the concurrent multi-scale optimization design of frame structure composed of glass or carbon fiber reinforced polymer laminates. In the composite frame structure, the fiber winding angle at the micro-material scale and the geometrical parameter of components of the frame in the macro-structural scale are introduced as the independent variables on the two geometrical scales. Considering manufacturing requirements, discrete fiber winding angles are specified for the micro design variable. The improved Heaviside penalization discrete material optimization interpolation scheme has been applied to achieve the discrete optimization design of the fiber winding angle. An optimization model based on the minimum structural compliance and the specified fiber material volume constraint has been established. The sensitivity information about the two geometrical scales design variables are also deduced considering the characteristics of discrete fiber winding angles. The optimization results of the fiber winding angle or the macro structural topology on the two single geometrical scales, together with the concurrent two-scale optimization, is separately studied and compared in the paper. Numerical examples in the paper show that the concurrent multi-scale optimization can further explore the coupling effect between the macro-structure and micro-material of the composite to achieve an ultralight design of the composite frame structure. The novel two geometrical scales optimization model provides a new opportunity for the design of composite structure in aerospace and other industries.

关键词： Composite frame structure Multi-scale optimization Topology optimization Fiber winding angle Structural compliance

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What Does Information Science Offer for Data Science Research?:A Review of Data and Information Ethics Literature

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Journal of Data and Information Science 2022年第4期7卷 16-38页

作者： Brady lund Ting Wang Emporia State University 1 Kellogg Circle Emporia Kansas 66801-2523United States

This paper reviews literature pertaining to the development of data science as a discipline,current issues with data bias and ethics,and the role that the discipline of information science may play in addressing these *** science research and researchers have much to offer for data science,owing to their background as transdisciplinary scholars who apply human-centered and social-behavioral perspectives to issues within natural science *** science researchers have already contributed to a humanistic approach to data ethics within the literature and an emphasis on data science within information schools all but ensures that this literature will continue to grow in coming *** review article serves as a reference for the history,current progress,and potential future directions of data ethics research within the corpus of information science literature.

关键词： Data science Library and information science Data ethics Data bias Education

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Why Open Government Data? The Case of a Swedish Municipality

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Journal of Data and Information Science 2021年第1期6卷 120-138页

作者： Koraljka Golub Arwid lund Linnaeus University 35195 VäxjöSweden Södertörn University 14189 HuddingeStockholmSweden

Purpose: The purpose of this exploratory study is to provide modern local governments with potential use cases for their open data, in order to help inform related future policies and decision-making. The concrete context was that of the Vaxjo municipality located in southeastern ***/methodology/approach: The methodology was two-fold: 1) a survey of potential end users(n=151) from a local university;and, 2) analysis of survey results using a theoretical model regarding local strategies for implementing open government ***: Most datasets predicted to be useful were on: sustainability and environment;preschool and school;municipality and politics. The use context given is primarily research and development, informing policies and decision making;but also education, informing personal choices, informing citizens and creating services based on open data. Not the least, the need for educating target user groups on data literacy emerged. A tentative pattern comprising a technical perspective on open data and a social perspective on open government was identified. Research limitations: In line with available funding, the nature of the study was exploratory and implemented as an anonymous web-based survey of employees and students at the local university. Further research involving(qualitative) surveys with all stakeholders would allow for creating a more complete picture of the matter. Practical implications: The study determines potential use cases and use contexts for open government data, in order to help inform related future policies and ***/value: Modern local governments, and especially in Sweden, are faced with a challenge of how to make their data open, how to learn about which types of data will be most relevant for their end users and what will be different societal purposes. The paper contributes to knowledge that modern local governments can resort to when it comes to attitudes of local citizens to open government da

关键词： Open data E-government Open government

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Dual Branches of MHD Three-Dimensional Rotating Flow of Hybrid Nanofluid on Nonlinear Shrinking Sheet

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Computers, Materials & Continua 2021年第1期66卷 127-139页

作者： Liaquat Ali lund Zurni Omar Ilyas Khan El-Sayed MSherif School of Quantitative Sciences Universiti Utara MalaysiaSintokKedah06010Malaysia KCAET Khairpur Mir’s Sindh Agriculture UniversityTandojamSindh70060Pakistan Faculty of Mathematics and Statistics Ton Duc Thang UniversityHo Chi Minh CityVietnam Center of Excellence for Research in Engineering Materials King Saud UniversityAl-Riyadh11421Saudi Arabia Electrochemistry and Corrosion Laboratory Department of Physical ChemistryNational Research CentreDokkiCairo12622Egypt

In this study,magnetohydrodynamic(MHD)three-dimensional(3D)flow of alumina(Al2O3)and copper(Cu)nanoparticles of an electrically conducting incompressible fluid in a rotating frame has been *** shrinking surface generates the flow that also has been *** single-phase(i.e.,Tiwari and Das)model is implemented for the hybrid nanofluid transport *** for alumina and copper nanomaterials in the water base fluid are *** layer approximations are used to reduce governing partial differential(PDEs)system into the system of the ordinary differential equations(ODEs).The three-stage Lobatto IIIa method in bvp4c solver is applied for solutions of the governing *** results have been shown to examine how velocity and temperature fields are influenced by various applied *** has been found that there are two branches for certain values of the suction/injection parameter b:The rise in copper volumetric concentration improved the velocity of hybrid nanofluid in the upper *** heat transfer rate improved for the case of hybrid nanofluid as compared to the viscous fluid and simple nanofluid.

关键词： Nonlinear surface viscous dissipation MHD Hybrid nanofluid two branches

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