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Hybrid Analytical Model for AC Copper Loss Computation of Hairpin Winding

Du, Yunlu (author), Huang, Yunkai (author), Guo, Baocheng (author), Peng, Fei (author), Yao, Y. (author), Dong, J. (author)

This article proposes a hybrid analytical model (HAM) for predicting ac copper losses in hairpin windings. The HAM combines the nonlinear semi-analytical model (SAM) and the 1-D ac copper loss computation model to solve the inaccurate boundary solutions of the 1-D ac copper loss computation model when magnetic saturation occurs in the stator...

journal article 2023

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Magnetic Field Prediction of U-shaped Interior Permanent Magnet Motor Considering Magnetic Bridge Saturation

Du, Yunlu (author), Huang, Yunkai (author), Guo, Baocheng (author), Peng, Fei (author), Yao, Yu (author), Dong, J. (author)

In this article, a new analytical model for predicting the magnetic field of the U-shaped interior permanent magnet motor (IPMM) is proposed. In the polar coordinates, rectangular permanent magnets are equivalent to the combination of consistent fan-shaped subdomains, and after that, the Laplace or Poisson equation of each solution domain can...

journal article 2023

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Spread-Spectrum Modulated Multi-Channel Biosignal Acquisition Using a Shared Analog CMOS Front-End

Rout, Samprajani (author), Monna, G.L.E. (author), Pareschi, Fabio (author), Setti, Gianluca (author), Serdijn, W.A. (author)

The key challenges in designing a multi-channel biosignal acquisition system for an ambulatory or invasive medical application with a high channel count are reducing the power consumption, area consumption and the outgoing wire count. This article proposes a spread-spectrum modulated biosignal acquisition system using a shared amplifier and...

journal article 2023

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Revealing Active Sites and Reaction Pathways in Methane Non-Oxidative Coupling over Iron-Containing Zeolites

Zhang, Hao (author), Bolshakov, Aleksei (author), Meena, Raghavendra (author), Garcia, Gustavo A. (author), Dugulan, A.I. (author), Parastaev, Alexander (author), Li, Guanna (author), Hensen, Emiel J.M. (author), Kosinov, Nikolay (author)

Non-oxidative coupling of methane is a promising route to obtain ethylene directly from natural gas. We synthesized siliceous [Fe]zeolites with MFI and CHA topologies and found that they display high selectivity (>90 % for MFI and >99 % for CHA) to ethylene and ethane among gas-phase products. Deactivated [Fe]zeolites can be regenerated...

journal article 2023

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Fundamental study of nonclassical nucleation mechanisms in iron

Ou, X. (author), Sietsma, J. (author), Santofimia, Maria Jesus (author)

Nucleation is the re-arrangement of a small number of atoms in the structure of a material leading to a new phase. According to the classical nucleation theory, a nucleus will grow if there is an energetically favourable balance between the stability of the newly formed structure and the energy costs associated to the formation of strains and...

journal article 2022

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Sequential Fe²⁺ oxidation to mitigate the inhibiting effect of phosphate and silicate on arsenic removal

Annaduzzaman, M. (author), Rietveld, L.C. (author), Hoque, Bilqis Amin (author), van Halem, D. (author)

Sequential iron (as Fe²⁺) oxidation has been found to yield improved arsenic (as As(III)) uptake than the single-step oxidation. The objective of this study was to gain a better understanding of interactions with phosphate (PO₄³⁻) and silicate (SiO₄²⁻) during sequential Fe²⁺...

journal article 2022

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Influence of temperature during pyrolysis of Fe-alginate: Unraveling the pathway towards highly active Fe/C catalysts

Tafjord, Joakim (author), Regli, Samuel K. (author), Dugulan, A.I. (author), Rønning, Magnus (author), Rytter, Erling (author), Holmen, Anders (author), Myrstad, Rune (author), Yang, J. (author)

Transition metals supported on carbons play an important role in catalysis and energy storage. By pyrolysis of metal alginate, highly active catalysts for the Fischer-Tropsch synthesis (FTS) can be produced. However, the evolution of the carbon (alginate) and transition metal (Fe³⁺) during pyrolysis remains largely unknown and was...

journal article 2022

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Groundwater-native Fe(II) oxidation prior to aeration with H₂O₂ to enhance As(III) removal

Roy, M. (author), van Genuchten, Case M. (author), Rietveld, L.C. (author), van Halem, D. (author)

Groundwater contaminated with arsenic (As) must be treated prior to drinking, as human exposure to As at toxic levels can cause various diseases including cancer. Conventional aeration-filtration applied to anaerobic arsenite (As(III)) contaminated groundwater can remove As(III) by co-oxidizing native iron (Fe(II)) and As(III) with oxygen (O...

journal article 2022

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Vivianite precipitation for iron recovery from anaerobic groundwater

Goedhart, R.C. (author), Müller, S. (author), van Loosdrecht, Mark C.M. (author), van Halem, D. (author)

Iron in anaerobic groundwater is commonly removed by oxidation followed by sand filtration. This produces large volumes of iron(III)(hydr)oxide sludge with little value. Our research investigates the novel concept of anaerobic iron(II) recovery from groundwater as the valuable mineral vivianite (Fe₃(PO₄)₂ • 8...

journal article 2022

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Additive manufacturing of bioactive and biodegradable porous iron-akermanite composites for bone regeneration

Putra, N.E. (author), Borg, K. G.N. (author), Diaz Payno, P.J. (author), Leeflang, M.A. (author), Klimopoulou, M. (author), Taheri, P. (author), Mol, J.M.C. (author), Fratila-Apachitei, E.L. (author), Zhou, J. (author), Zadpoor, A.A. (author)

Advanced additive manufacturing techniques have been recently used to tackle the two fundamental challenges of biodegradable Fe-based bone-substituting materials, namely low rate of biodegradation and insufficient bioactivity. While additively manufactured porous iron has been somewhat successful in addressing the first challenge, the limited...

journal article 2022

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Extending Winding Function Theory to Incorporate Secondary Effects in the Design of Induction Machines and Drives

Ge, Baoyun (author), Liu, Wenbo (author), Dong, J. (author), Liua, Mingda (author)

High-performance electric drive applications necessitate a high fidelity model to predict the terminal characteristics of machines in the design stage to fulfill a system-level evaluation together with the converters. This article interprets winding function theory (WFT) from the field perspective and incorporates secondary effects, such as...

journal article 2022

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Extrusion-based 3D printed biodegradable porous iron

Putra, N.E. (author), Leeflang, M.A. (author), Minneboo, M.B. (author), Taheri, P. (author), Fratila-Apachitei, E.L. (author), Mol, J.M.C. (author), Zhou, J. (author), Zadpoor, A.A. (author)

Extrusion-based 3D printing followed by debinding and sintering is a powerful approach that allows for the fabrication of porous scaffolds from materials (or material combinations) that are otherwise very challenging to process using other additive manufacturing techniques. Iron is one of the materials that have been recently shown to be...

journal article 2021

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Integrating biological As(III) oxidation with Fe(0) electrocoagulation for arsenic removal from groundwater

Roy, M. (author), van Genuchten, Case M. (author), Rietveld, L.C. (author), van Halem, D. (author)

Arsenic (As) is a toxic element present in many (ground)water sources in the world. Most conventional As removal techniques require pre-oxidation of the neutral arsenite (As(III)) species to the negatively charged arsenate (As(V)) oxyanion to optimize As removal and minimize chemical use. In this work, a novel, continuous-flow As removal...

journal article 2021

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Identification of iron and sulfate release processes during riverbank filtration using chemical mass balance modeling

An, Seongnam (author), Kang, Peter K. (author), Stuyfzand, Pieter Jan (author), Lee, Woonghee (author), Park, Saerom (author), Yun, Seong Taek (author), Lee, Seunghak (author)

Various hydrogeochemical processes can modify the quality of river water during riverbank filtration (RBF). Identifying the subsurface processes responsible for the bank-filtered water quality is challenging, but essential for predicting water quality changes and determining the necessity of post-treatment. However, no systematic approach for...

journal article 2021

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Iron loading is a prominent feature of activated microglia in Alzheimer’s disease patients

Kenkhuis, Boyd (author), Somarakis, Antonios (author), de Haan, Lorraine (author), Dzyubachyk, Oleh (author), Ijsselsteijn, Marieke E. (author), de Miranda, Noel F. C. C. (author), Lelieveldt, B.P.F. (author), Dijkstra, Jouke (author), Van Roon-Mom, Willeke (author), Höllt, T. (author), van der Weerd, Louise (author)

Brain iron accumulation has been found to accelerate disease progression in amyloid-β(Aβ) positive Alzheimer patients, though the mechanism is still unknown. Microglia have been identified as key players in the disease pathogenesis, and are highly reactive cells responding to aberrations such as increased iron levels. Therefore, using...

journal article 2021

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Quantification of different iron forms in the aceruloplasminemia brain to explore iron-related neurodegeneration

Vroegindeweij, Lena H.P. (author), Bossoni, Lucia (author), Boon, Agnita J.W. (author), Wilson, J. H.Paul (author), Bulk, Marjolein (author), Labra Muñoz, J. (author), Huber, M. (author), Webb, A. (author), van der Weerd, Louise (author)

Aims: Aceruloplasminemia is an ultra-rare neurodegenerative disorder associated with massive brain iron deposits, of which the molecular composition is unknown. We aimed to quantitatively determine the molecular iron forms in the aceruloplasminemia brain, and to illustrate their influence on iron-sensitive MRI metrics. Methods: The...

journal article 2021

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Anoxic storage to promote arsenic removal with groundwater-native iron

Annaduzzaman, M. (author), Rietveld, L.C. (author), Ghosh, D. (author), Hoque, Bilqis A. (author), van Halem, D. (author)

Storage containers are usually used to provide a constant water head in decentralized, community groundwater treatment systems for the removal of iron (Fe) and arsenic (As). However, the commonly practiced aeration prior to storage assists in rapid and complete Fe²⁺ oxidation, resulting in poor As removal, despite sufficient native...

journal article 2021

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The role of H₂ in Fe carburization by CO in Fischer-Tropsch catalysts

Chai, Jiachun (author), Pestman, Robert (author), Chen, Wei (author), Dugulan, A.I. (author), Feng, Bo (author), Men, Zhuowu (author), Wang, Peng (author), Hensen, Emiel J.M. (author)

The formation of Fe-carbide phases is relevant to the synthesis of Fischer-Tropsch synthesis catalysts. We investigated the carburization of Raney Fe as a model catalyst using spectroscopic and temperature-programmed techniques. IR spectroscopy shows that CO dissociation already occurs at −150 °C, while C diffusion into metallic Fe requires...

journal article 2021

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Characterisation of the impact of dissolved organic matter on iron, manganese, and arsenic mobilisation during bank filtration

Abdelrady, Ahmed (author), Sharma, Saroj (author), Sefelnasr, Ahmed (author), Kennedy, M.D. (author)

Bank filtration (BF) has been used for many years as an economical technique for providing high-quality drinking water. However, under anaerobic conditions, the aquifer release of undesirable metal(loid)s, such as iron manganese, and arsenic, reduces the bank filtrate quality and thus restricts the application of this technique. This study...

journal article 2020

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Data Fusion for the Prediction of Elemental Concentrations in Polymetallic Sulphide Ore Using Mid-Wave Infrared and Long-Wave Infrared Reflectance Data

Desta, F.S. (author), Buxton, M.W.N. (author), Jansen, Jeroen (author)

The increasing availability of complex multivariate data yielded by sensor technologies permits qualitative and quantitative data analysis for material characterization. Multivariate data are hard to understand by visual inspection and intuition. Thus, data-driven models are required to derive study-specific insights from large datasets. In the...

journal article 2020