University Of Twente Research Articles

Smart farming using SIPINDO powered by SMARTseeds: fertilizers recommendation for chili, tomato, and cucumber

In the agriculture 4.0 era, farmers need fast and precise information related to fertilizers recommendation. SIPINDO powered by SMARTseeds is an application created by the consortium of East West Indonesia (EWINDO), IPB University, Twente University, Nelen & Schuurmans, AKVO, and ICCO. This application provides services to farmers such as nutrient status and fertilizers recommendation for chili, tomato, and cucumber. The soil properties database is now available for Lampung, West Java, Central Java, Yogyakarta, and East Java. From the database of the soil properties, maps of soil pH, nitrogen, phosphorus, and potassium are made and collected in a data center called the Lizard. Data of nutrient status and fertilizers recommendation in the Lizard are then sent to the farmer’s smartphone according to their coordinates. Fertilizer validation test results in East Java showed that fertilizer dosages recommended by SIPINDO powered by SMARTseeds application on chilies, tomatoes, and cucumber produced better results in production and cost efficiency compared to those of farmers. Therefore the application of SIPINDO powered by SMARTseeds has the opportunity to be developed and disseminated to farmers so that agriculture 4.0 is reached.

A model for modifying the public transport service patterns to account for the imposed COVID-19 capacity

As public transport operators try to resume their services, they have to operate under reduced capacities due to COVID-19. Because demand can exceed capacity at different areas and across different times of the day, drivers have to refuse passenger boardings at specific stops to avoid overcrowding. Given the urgent need to develop decision support tools that can prevent the overcrowding of vehicles, this study introduces a dynamic integer nonlinear program to derive the optimal service patterns of individual vehicles that are ready to be dispatched. In addition to the objective of satisfying the imposed vehicle capacity due to COVID-19, the proposed service pattern model accounts for the waiting time of passengers. Our model is tested in a bus line connecting the University of Twente with its surrounding cities demonstrating the trade-off between the reduced in-vehicle crowding levels and the excessive waiting times of unserved passengers.

Editorial: SESMO Special Issues

As the journal nears the end of its second official year, we are pleased to start accepting submissions to our first two Special Issues. The first Special Issue is on Resilience of complex coupled Socio-Technical-Environmental systems through the modeling lens with guest editors Tatiana Filatova, Tina Comes (4TU Resilience Engineering Centre), Christoph Hoelscher (ETH Zurich) and Juliet Mian (Resilence Shift). This Special Issue aims to bring together cutting-edge research and international practice to offer insights into the latest scientific modelling methods, gaps, challenges and opportunities and best practice examples relating to operationalising resilience across a range of socio-technical-environmental applications. The second Special Issue is on Large-scale behavioural models of land use change with guest editors Calum Brown (Karlsruhe Institute of Technology), Tatiana Filatova (University of Twente), Birgit Müller (Helmholtz Centre for Environmental Research – UFZ), and Derek Robinson (University of Waterloo). This Special Issue is focussed on better understanding and modelling of temporal or spatial scales in land use dynamics.
 
 We invite new proposals for Special Issues that fit within SESMO’s aims and scope. Our Special Issues are cohesive collections of articles focussed on a specific contemporary theme related to socio-environmental systems modelling. The Special Issue can build on previous work and research gaps, but can also explore new and emerging terrain relevant to our aims. Although the conceptualisation of a Special Issue may be initiated in a conference or workshop, it is critical that such a proposal also builds on the original dialogue. Articles should also be canvassed from across the globe. SESMO is an open access journal with no article processing or publication charges for authors. If you have a topic to propose, please contact us to discuss further.

Pioneering Low-Cost 3D-Printed Transtibial Prosthetics to Serve a Rural Population in Sierra Leone

Background: The International Society for Prosthetics and Orthotics and the World Health Organization have estimated that 0·5% of the population in low-and middle-income countries (LMICs) need prostheses or orthotics. Method: We applied computer-aided design (CAD) and computer-aided manufacturing (CAM) to produce low-cost transtibial prosthetic sockets. Qualitative research was performed using questionnaires to investigate the use, participants’ satisfaction, and possible complications related to the prostheses. Questionnaires were conducted prior to production of the prosthesis and five-six weeks after fitting the prosthesis. A personal short-term goal was set by the participants participating in this study. Findings: In February and March 2020, eight participants received a 3D printed transtibial prosthesis in the village of Masanga in Tonkolili district, Sierra Leone. After six weeks, six of the eight participants reached their personal rehabilitation goals. Compared to the old prosthesis three of the eight participants worn previously; the 3D printed prostheses scored higher regarding the level of mobility, and functional and esthetical satisfaction with the prosthesis. Interpretation: We have come a step closer to the production of low-cost prostheses for LMICs. The goal of our project is to perform long-term follow-up and to refine our concept of 3D printed prostheses for LMICs to provide practical solutions for a global health need unmet to date. Funding: € 15,000 was collected during a crowdfunding campaign in collaboration with the Dutch Albert Schweitzer Fund. Internship allowance for MvdS was obtained from the University of Twente. 3D-scanner, 3D-printer, and printing material were donated by Ultimaker BV and Shining 3D. Funding Statement: € 15,000 was collected during a crowdfunding campaign in collaboration with the Dutch Albert Schweitzer Fund. Internship allowance for MvdS was obtained from the University of Twente. 3D-scanner, 3Dprinter, and printing material were donated by Ultimaker BV and Shining 3D. Declaration of Interests: none of the authors has any conflict of interest to declare. Lars Brouwers is Chair of the Foundation 3D printing in developing countries, Merel van der Stelt, Thomas Maal and Martin P. Grobusch are board members of the Foundation. Part of this work constituted a section of Merel van der Stelt’s master thesis. Ethics Approval Statement: The protocol was reviewed and approved by the Scientific Research Committee of the Masanga Medical Research Unit (MMRU). Ethical approval for this study was obtained from the Sierra Leone Ethics and Scientific Review committee, obtained on 6 January 2019. Written informed consent was obtained from all participants for participation in the study and also for publication of photos, videos, and data in which they wear medical aids.

Designing innovative solutions for solar‐powered electric mobility applications

AbstractDesigning with photovoltaics (PV) is the core focus of this paper which presents the results of a design study on conceptual PV applications for electric mobility systems. This is a relevant direction for new product development because PV technology can contribute to improved features of electric mobility systems not just in terms of CO2 emissions reduction but also regarding product aesthetics and user experiences. Design studies are multidisciplinary by nature; therefore, in this case technical, user, regulatory and aesthetic aspects are covered. Eleven conceptual designs were developed in 2019 by means of a design project executed at the University of Twente, encompassing solutions for PV‐powered charging of electric vehicles, vehicle‐integrated PV products and other applications. The concepts focus on various modes of transport beyond passenger cars such as public transportation, electric bicycles and utility vehicles, in some cases applying alternative charging technologies such as battery swapping and induction charging in their design. In this paper four of these conceptual designs are presented as case studies, showing their multidisciplinary focus as well as parts of the design process behind their development. An evaluation of these conceptual designs revealed several design challenges that need to be addressed in their development, including the limited space available for integrating PV cells, the technical limitations posed by some of the proposed charging methods and the effective visual communication of the concept's intended function.

COVID-19 in Dutch higher education

ABSTRACT In this contribution to the Special Issue of Studies in Higher Education, I describe developments during the COVID-19 pandemic in Dutch higher education along three lines. First, the context is outlined in chronological order. It concerns the evolution of the pandemic in the Netherlands, complemented by the general situation at my own university – the University of Twente (UT). The UT has almost 12,000 students, about 30% of whom come from abroad. 1 Many of the foreign students come from neighbouring country Germany (12% of the total number of students). The university is located in the east of the Netherlands, close to the border with Germany, and has a beautiful spacious campus. The nickname of the university is the Entrepreneurial University, which underlines its character. The second part of my contribution gives an overview of a number of measures and issues that were taken during the COVID-19 outbreak in the Dutch higher education sector. The third part contains a number of personal perceptions and gives an impression of my state of mind in recent months. 2

Gaining Momentum

We're taking off: We look back at the developments of 2020 and look forward to what 2021 has in store for Batteries & Supercaps. The past year has been challenging, to say the least. However, despite big swathes of research almost coming to a standstill, we at Batteries & Supercaps are grateful that you entrusted your research to us. The outstanding quality of the submissions we receive from you is reflected, among other things, in their citation frequency. This has led to the inclusion of Batteries & Supercaps in Clarivate's Science Citation Index Expanded (SCIE), part of the Core Collection on Web of Science. This means that Batteries & Supercaps will qualify for its first Journal Impact Factor in 2021, more than a year before expected! The pandemic that has swept the world meant that we could not connect with you in person at conferences as we would usually do, so we, along with our colleagues from our Chemistry Europe sister journals, have organised a series of themed online symposia, free to attend for anyone, anywhere. Batteries & Supercaps have held two successful symposia. The first was on machine learning as applied to battery materials (chaired by our Board Member Alejandro A. Franco, Figure 1) and the second one was on advanced computational methods in battery research (chaired by Piotr Jankowski, Figure 2). We have two more live symposia lined up for you, one on 18 January on Lithium Metal Anode (chaired by Stefan Kaskel), which is linked to our special collection dedicated to the same topic, and another one on 02 March (joint with our sister journal ChemElectroChem), where we will go Beyond Lithium-Ion Batteries and is also linked to an ongoing special collection. Check our homepage regularly and follow us on Twitter @Batt_Supercaps to find the details about registration for these events and all of our new developments! Virtual Symposium “Machine Learning Applied to Batteries”. Speakers (right, top to bottom): David Howey (Oxford University), Ivano E. Castelli (Technical University of Denmark), and Sebastian Thiede (University of Twente). Moderator (left): Alejandro A. Franco (Université de Picardie Jules Verne). Virtual Symposium “Advanced Computational Methods in Battery Research”. Speakers: Richard D. Braatz (Massachusetts Institute of Technology, top left), Ulrike Krewer (Karlsruhe Institute of Technology, top right), and Alejandro A. Franco (Université de Picardie Jules Verne, bottom left). Moderator: Piotr Jankowski (Technical University of Denmark, middle right). It now remains for us to thank all of you, our authors, reviewers and readers, as well as everyone who engages with us on social media and who have taken part in our symposia. We are grateful for your support of Batteries & Supercaps and we look forward to the next year with you! Rosalba and Greta

WORLD EXPERIENCE OF PROCESS QUALITY MANAGEMENT OF TEACHER TRAINING IN HEI

The quality of higher education is the main feature of HEI. There are several approaches to assessing the performance of educational institutions. One of the leading process approaches is based on the principles of TQM (Total Quality Management) and the requirements for quality management systems of the International Organization for Standardization ISO. The basis for assessing the quality of higher education and training, as well as the quality of HEI’s activities are educational standards. The Ukrainian standards include: state standard, industry standards, HEI’s standards. The international standards of ENQA education quality guarantees include: standards for internal quality assurance of HEI, standards for external quality assurance of HEI, the European standards for external agencies of quality assurance. There are several models of education quality management systems: model of quality management system according to the international standard ISO 9001:2000 (DSTU ISO 9001:2001); the model of the European Foundation for Quality Management (EFQM) and its modifications for HE; the model of the Center for Higher Education Policy Studies (CHEPS) of the University of Twente (Netherlands); model of the Association of Universities in the Netherlands (VSNU); Belgian-Dutch model (Expertgroep HBO); Malcolm Baldrige National Quality Award in the field of education; benchmarking model for Australian universities and others. According to most researchers, there are some advantages in creating a quality management system of higher education institution in the context of the TQM ideology, which involves the application of process and systemic principles. The comparative characterization of factors influencing the quality of education in comparison with the principles of TQM, EFQM’s criteria and the requirements of the international standard ISO 9001:2000 and interdependent business processes. In the universities of the USA, France, Great Britain and other developed countries, the problems of general process quality management are considered in three planes. The study of the positive experience of developed countries, HEIs of which are included in the world rankings, and graduates are in demand in the labor market, allows to form a mechanism for implementing the TQM principles both at the state and regional levels.

Optimizing Student-Driven Learning (SdL) through a Framework Designed for Tailoring Personal Student Paths

Our ever-changing and developing society constantly requires professions that did not exist 20 years ago. Students have to become professionals capable of steering their own career development and controlling their own learning process, at university and in their future profession. In order to reach these goals, lecturers have to understand the different needs of students in terms of knowledge and interests. This research offers a framework to help students deal with possible knowledge gaps and account for personal interests to match defined learning goals, utilizing the author’s master’s course in design for maintenance operations (DfMO) at the University of Twente as a basis for validation. First, a literature review was conducted on successful modern techniques of student-driven learning (SdL) to identify the best practices to use and possible pitfalls to avoid. Second, an analysis of the target group was carried out. Third, the research identified the most effective way to create such a tool (framework), taking into account the possible entry points of students. In particular, the research tried to understand to what extent it is possible and valuable to offer a student-driven approach. Finally, the tool was evaluated by representatives of the target group.

DATA MODELING FOR OPERATION AND MAINTENANCE OF UTILITY NETWORKS: IMPLEMENTATION AND TESTING

Abstract. The organisational data models that support the information needs of utility network managers are proprietary and domain-specific, while the emerging national standards in this field often lack lifecycle data representation capabilities. However, multiple types of utility networks can be comprehensively represented with the free and open-source Utility Network Application Domain Extension (ADE) of the international standard CityGML. The Operation & Maintenance (O&M) Domain Ontology is a proposed extended version of the Utility Network ADE that allows for consistent and comprehensive processing, storage and exchange of O&M-related utility network data. So far, this ontology has not yet been implemented in a spatial-relational database. Consequently, the support it offers during routine utility asset management tasks has remained untested. This paper, therefore, tests the support of the O&M domain ontology for asset management and proposes a database implementation of this data model. To this end, it models and loads two utility networks from the campus of the University of Twente, the Netherlands. It tests the ontology’s support for asset management by simulating a street reconstruction project and retrieving necessary project information in relation to a utility’s (a) maintenance history and performance, and (b) site conditions and valve locations. Results show that the implemented model supports projects with rapid, comprehensive, and consistent information about semantic details of utilities. Such data needs yet to be collected and registered systematically to enable future data-driven asset management practices.

Optimizing the performance of an active grid to generate high intensity isotropic free stream turbulence

We present an optimized procedure for generating isotropic, homogeneous, high intensity turbulent flows behind an active grid. The double random protocol (R. E. G. Poorte, “On the motion of bubbles in active grid generated turbulent flows,” Ph.D. thesis, University of Twente, 1998 and subsequent works) used for operating the active grid [H. Makita, “Realization of a large-scale turbulence field in a small wind tunnel,” Fluid Dyn. Res. 8, 53 (1991)] is optimized based on the tip speed ratio α ≡Vtip⟨U⟩=2πΩC⟨U⟩, where Vtip is the speed of the active grid winglet at its tip, 2C is the winglet chord length, Ω is the mean winglet rotational speed, and U is the mean flow speed. A systematic assessment of the resulting turbulent flow is carried out using both hot-wire anemometry (single point and two point) and particle image velocimetry (PIV). It is shown that just using the double random protocol does not guarantee an isotropic flow, and the tip speed ratio of the active grid elements is also important to achieve isotropy. Too high a tip speed ratio, however, results in decreased turbulence intensities. Optimal values of the tip speed ratio, given the trade-off between isotropy and turbulence intensity, are given for the double random protocol. Furthermore, our measurements clearly show that conclusions about the structure and isotropy of active-grid turbulence cannot be based on single-point measurements alone; at the least, two-point or multi-point PIV measurements are essential to evaluate the performance of active grids. This is supported by observing the behavior of longitudinal and transverse correlation functions along the arbitrary directions and the convergence of proper orthogonal decomposition reconstructions to the true value. Interestingly, a simpler test based on the ratio of longitudinal to transverse turbulence intensities appears more robust than the one based on single-point correlations.

AC loss and contact resistance of different CICC cable patterns: Experiments and numerical modeling

• The AC loss and interstrand contact resistance measured on three prototype Nb 3 Sn Cable-In-Conduit Conductors with significantly different cabling twist pitch patterns. • Simulations, done by using the JackPot model are in fair agreement, confirming the consistency of data and allowing reliable predictions with the JackPot model. • For CICC cables, a design petal wrap coverage of 70 % should be maintained for CS cables to reduce the AC loss. A critical threshold value of void fraction exists, which makes the presence of petal wraps ineffective in reducing coupling loss. • The JackPot simulations with derived corrections for inter-petal contact resistance representing 70 % petal wrap coverage show that the Twente cable design has the lowest coupling loss. • So far, the Twente cable design seems a suitable candidate for CFETR or DEMO conductors, made of strain-sensitive strands such as Nb 3 Sn or other materials, for minimization of coupling loss and strand indentation. For upcoming nuclear fusion energy reactors, like the China Fusion Engineering Test Reactor (CFETR) and EU-DEMO, the superconducting Cable-In-Conduit Conductors (CICC) are in the design phase, and the operating conditions like electromagnetic forces can be higher than in previous devices like ITER. The prototype conductors for the Central Solenoid (CS) coils in the CFETR, for example, are designed to produce a peak field of 19.9 T and are expected to be made of high current density Nb 3 Sn strands. Investigations are also ongoing on the application of bismuth strontium calcium copper oxide (BSCCO) and MgB 2 strands for CICCs in fusion reactors. The latter material, MgB 2, could be applied for superconductors subjected to lower magnetic fields, such as Poloidal Field coils, Correction Coils, and Feeders. The performance of all these strands is sensitive to strain, and the mechanical strength of the brittle filaments is relatively weak. This requires a thorough analysis of the cable pattern in terms of the mechanical support of the strands along their length in combination with the minimization of the interstrand coupling currents and strand indentation. As an initial step to finding the most appropriate cable pattern for CICCs, three prototype CICCs made of ITER type Nb 3 Sn strands with significantly different cable twist patterns are tested experimentally for AC coupling loss, interstrand contact resistance, and strand indentation. The three cabling patterns referred to as the Twente, CWS (copper wound superconducting strand), and CFETR-CSMC (CFETR Central Solenoid Model Coil) design. The numerical code JackPot ACDC developed at the University of Twente is used to analyze the interstrand coupling loss and contact resistance. The new ASIPP (Institute of Plasma Physics, Chinese Academy of Sciences) triplet modified CWS design is aimed at reducing strand pinching during cabling, which causes degradation of transport properties during compaction and cyclic loading. The Twente design has the same objective but also aims at reducing the coupling loss while maximizing the mechanical lateral support for the strands by making the twist pitch ratio of the sequential cabling stages close to one. The CFETR-CSMC, taken as a reference for comparison, has cable a pattern mostly similar to the ITER CS cable design.

AC loss and contact resistance in REBCO CORC®, Roebel, and stacked tape cables

Many high-temperature superconductor (HTS) applications require superconducting cables with high currents while operating in an alternating magnetic field. HTS cables should be composed of numerous superconducting tapes to achieve the required current capacity. Alternating current and magnetic fields cause AC losses in such cables and can provoke conductor instability. AC losses and contact resistances were measured of several cable designs based on commercially available REBCO tapes at the University of Twente. The AC loss was measured under identical conditions for eight REBCO conductors manufactured according to three types of cabling methods—CORC® (Conductor on Round Core), Roebel, and stacked tape, including a full-size REBCO CICC (cable in conduit conductor). The measurements were done at T = 4.2 K without transport current in a sinusoidal AC magnetic field of 0.4 T amplitude and frequencies from 5 to 55 mHz. The AC loss was measured simultaneously by calibrated gas flow calorimeter utilizing the helium boil-off method and by the magnetization method using pick-up coils. Also, the AC loss of two CORC® conductors and a Roebel cable was measured at 77 K. Each conductor was measured with and without background field of 1 T. The measured AC coupling loss in the CORC® and Roebel conductors is negligible at 4.2 K for the applied conditions while at 77 K coupling loss was observed for all conductors. The absence of coupling loss at 4.2 K can be explained by shielding of the conductor interior; this is confirmed with measurement and calculation of the penetration field of CORC® and Roebel cables. The inter-tape contact resistance was measured for CORC® and stacked tape samples at 4.2 and 77 K. It was demonstrated that a short heat treatment of CORC® conductor with solder-coated tapes activates tape-to-tape soldering and decreases the contact resistance. The reduction of contact resistance by two orders in magnitude to tens of nΩm is comparable with the interstrand contact resistance in ITER Nb3Sn type conductors.

АДАПТАЦІЯ ТА ВАЛІДАЦІЯ АНГЛОМОВНОЇ ВЕРСІЇ ОПИТУВАЛЬНИКА ВІНЦЕНТА ВАН БРЮГГЕНА «ВИДИ ЕКЗИСТЕНЦІЙНОЇ ТРИВОГИ»

У статті пропонуються результати адаптації української версії англомовного опитувальника В. Ван Брюггена (університет Твенте, Нідерланди) Existential Concerns Questionnaire (ECQ). На сьогодні в Україні (та серед російськомовних опитувальників також) не існувало інструменту для диференціації базових видів екзистенційної тривоги. Українська версія опитувальника отримала назву «Види екзистенційної тривоги». У теоретичній частині статті розглянуто природу і особливості екзистенційної тривоги із найдавніших часів до найсучасніших світових досліджень у сфері нейроекзистенціалізму та нейробіології екзистенціалізму, а також зроблено огляд основних англомовних опитувальників екзистенційної тривоги. Факторна структура англомовної версії опитувальника складається з п’яти шкал: страху смерті, самотності, ідентифікації, сенсу життя та провини. Проте, українська версія була модифікована і скорочена до чотирьох шкал (страху смерті, самотності, ідентифікації та сенсу життя). Крім цього, в українській версії було запропоновано нову модель видів екзистенційної тривоги, що склалася із двох нових шкал (об’єктивна екзистенція та суб’єктивна екзистенція). Адаптацію методики здійснено згідно із стандартними алгоритмами роботи з іншомовними психодіагностичними інструментами: перекладено англомовну версію, перевірено внутрішню узгодженість, факторну структуру, конструктну, дискримінантну та конкурентну валідності. У досліджені взяв участь 251 респондент віком від 18 до 65 років. Опитувальник складається із 22 запитань.

Pressure-induced critical current reduction in impregnated Nb3Sn Rutherford cables for use in future accelerator magnets

The measured critical current reduction in Nb3Sn Rutherford cables under magnet-relevant transverse pressure levels is analyzed in terms of the strain state of the filaments inside their strands. Several straightforward mechanical 2D FE models of the cables’ cross-section are used to translate the stress that is applied to the surface of the impregnated cables into a strain distribution on its strands. The resulting critical current reduction of the cable is then estimated from the average deviatoric strain in the strands’ filamentary zone, using the well-established strain scaling relations obtained for isolated strands. This allows to identify the main factors that influence the pressure response of impregnated Nb3Sn accelerator cables. The analysis is presented for state-of-the-art cable samples that were measured at the University of Twente and shows how especially stiff and incompressible resins reduces the deviatoric strain in the filamentary zone of the cable strands, but also how relatively small alignment errors can lead to stress concentrations that reduce the critical current density significantly.

A New Enclosed Method for Transverse Mechanical Testing on CICC Conductors

CFETR, the China Fusion Engineering Test Reactor, is a new tokamak reactor under preliminary design, where the toroidal field coils were designed to generate a magnetic field of 14.3 T. Here the TF conductors are required to operate under a Lorentz force of 1200 kN/m while keeping stable performance. For these requirements, the main goal is to limit the degradation of the conductor. According to the previous study, the conductor can be analyzed with a mechanical method to evaluate the conductor-performance in the electromagnetic field. In this method, the force was distributed equally from the up and downside of the press modules, which has notches in the middle of the conduit. The stress distribution is quite different from the accumulated stress in the Lorentz force direction. Moreover, the strand extension has been found in the notches. Considering these conditions, a new method where the cable surrounded by an enclosed module was designed to simulate this kind of accumulative stress in the cable. The new module is defined as an enclosed jacket press method compared to the former method (jacket with notches) developed at the University of Twente. In this study, the cable's mechanical properties tested by two different modules were compared. The results were analyzed to evaluate the similarity of different press methods for EM simulation. The result shows that the cable pressed with an enclosed module jacket provided more similar deformation trends when comparing to the distribution of electromagnetic stress within the cable.

Fatigue of Tungsten Fiber/Copper Matrix Composite—An Interlaboratory Study

Abstract Seven laboratories participated in an interlaboratory study to assess the applicability of ASTM E606, Test Method for Strain-Controlled Fatigue Testing, to strain-controlled fatigue of a tungsten fiber/copper matrix composite (Battelle Columbus, University of Iowa, IITRI, MCL, MarTest, Rockwell International Science Center and University of Twente). Because of the material and specimen fabrication methods, the number of fibers in the 9, 25, and 36 % fiber volume fraction specimens is approximately the same and the strain-life data are nearly identical for each of the volume fractions. Although the specimen aspect ratio is within the nominal range, the specimen diameter is less than the nominal value specified in ASTM E606. Laboratories reporting data noted that a small specimen diameter and a large gage section aspect ratio made specimen alignment difficult. Thus, specimen buckling was problematic at high strain ranges. The study data are reported and analyzed with nonparametric and semiparametric statistical methods to assess the effect of study covariates on fatigue life. The median fatigue life, median absolute deviation from the median, and interquartile range are reported as measures of central tendency and variability. ASTM E606 may be used as a guide to evaluate the fatigue response of this type of composite material if the length-to-diameter aspect ratio, specimen alignment in the fatigue machine, and specimen surface finish are closely monitored to ensure valid data.

ETOPIA Online Summer School 2020

In 2019, the European Commission (EC) under the Marie Sktodowska-Curie Actions (MSCA) Horizon 2020 projects granted funding to ETOPIA, for advancing research in Electromagnetic Compatibility, and to train twelve Early Stage Researchers (ESR) in investigating the interactions between the electrical power system and power electronics. ETOPIA, acronym for European Training network Of Ph.D. researchers on Innovative EMI analysis and power Applications, is a consortium, involving six universities across Europe (i.e., University of Twente, University of Craiova, Politecnico de Milano, Leibniz University, University of Zielo-na Gora. and the University of Nottingham) and 18 partner organizations, including the IEEE EMC Society Technical Committee 7 (TC-7) on Low Frequency EMC.

38th International Deep Drawing Research Group Conference

Forming 4.0: Big Data – Smart Solutions Enschede, NetherlandsInternational Deep Drawing Research Group annual conference 2019 was held on 3–7 June in Enschede, The Netherlands. The conference was co-organized by the University of Twente and Tata Steel Europe. The conference chairs were Prof. Ton van den Boogaard, University of Twente and Dr. Nico Langerak, Tata Steel Europe.During IDDRG 2019, all engineering aspects of sheet metal forming were discussed, such as behavior of workpiece materials, formability, tools, tribology, process robustness, simulation methods and experiments. Apart from the general topics, the theme of IDDRG 2019 was Forming 4.0: Big Data, Smart Solutions.List of International Deep Drawing Research Group, Topics, Keynotes, Scientific Committee, Organizing Committee, Participants & Authors, Acknowledgement, Sponsors and exhibitors, Editors are available in this pdf.

UAV-g 2019: Unmanned Aerial Vehicles in Geomatics

Unmanned aerial vehicle in geomatics (UAV-g) is a well-established scientific event dedicated to UAVs in geomatics and remote sensing. In the different editions of the journal, new scientific challenges have increased their synergy with adjacent domains, such as robotics and computer vision, thereby increasing the impact of this conference. The 2019 edition has been hosted by the University of Twente (The Netherlands) and has attracted about 300 participants for the full three-day program. Researchers from 36 different countries (from all continents) have presented 89 accepted papers in 17 oral and 2 poster sessions. The presented papers covered multi-disciplinary topics, such as photogrammetry, natural resources monitoring, autonomous navigation, and deep learning. All these contributions have in common the use of UAV platforms for the innovative acquisition and processing of the acquired data and information extracted from the surrounding environment.