Henrik Andersson

Publikationer

Artiklar i tidskrifter
Artiklar, forskningsöversikter
Doktorsavhandlingar, sammanläggningar
Konferensbidrag
Licentiatavhandlingar, sammanläggningar
Dataset

Artiklar i tidskrifter

Zhang, R. , Hummelgård, M. , Örtegren, J. , Andersson, H. , Olsen, M. , Chen, W. , Wang, P. , Dahlström, C. & et al. (2023). Energy Harvesting Using Wastepaper-Based Triboelectric Nanogenerators. Advanced Engineering Materials, vol. 25: 11  

Zhang, R. , Hummelgård, M. , Örtegren, J. , Andersson, H. , Olsen, M. , Chen, D. , Li, J. , Eivazi, A. & et al. (2023). Triboelectric nanogenerators with ultrahigh current density enhanced by hydrogen bonding between nylon and graphene oxide. Nano Energy, vol. 115  

Zhang, R. , Hummelgård, M. , Örtegren, J. , Song, M. , Olsen, M. , Andersson, H. , Blomquist, N. & Olin, H. (2022). High performance single material-based triboelectric nanogenerators made of hetero-triboelectric half-cell plant skins. Nano Energy, vol. 94  

Zhang, R. , Hummelgård, M. , Örtegren, J. , Andersson, H. , Blomquist, N. , Phadatare, M. , Patil, R. , Arshadi Rastabi, S. & et al. (2022). Triboelectric biometric signature. Nano Energy, vol. 100  

Zhang, R. , Hummelgård, M. , Örtegren, J. , Olsen, M. , Andersson, H. , Yang, Y. , Olin, H. & Wang, Z. L. (2022). Utilising the triboelectricity of the human body for human-computer interactions. Nano Energy, vol. 100  

Ahmad, J. , Sidén, J. & Andersson, H. (2021). A Proposal of Implementation of Sitting Posture Monitoring System for Wheelchair Utilizing Machine Learning Methods. Sensors, vol. 21    

Zhang, R. , Hummelgård, M. , Örtegren, J. , Olsen, M. , Andersson, H. , Yang, Y. , Wang, Z. -. , Olin, H. & et al. (2021). All-inorganic triboelectric nanogenerators based on Mo6S3I6 and indium tin oxide. Nano Energy, vol. 89    

Andersson, H. , Örtegren, J. , Zhang, R. , Grauers, M. & Olin, H. (2021). Variable low-density polylactic acid and microsphere composite material for additive manufacturing. Additive Manufacturing, vol. 40  

Zhang, R. , Dahlström, C. , Zou, H. , Jonzon, J. , Hummelgård, M. , Örtegren, J. , Blomquist, N. , Yang, Y. & et al. (2020). Cellulose-Based Fully Green Triboelectric Nanogenerators with Output Power Density of 300 W m−2. Advanced Materials, vol. 32: 38    

Engholm, M. , Hammarling, K. , Andersson, H. , Sandberg, M. & Nilsson, H. (2019). A Bio-Compatible Fiber Optic pH Sensor Based on a Thin Core Interferometric Technique. Photonics, vol. 6: 1    

Li, X. , Sidén, J. , Andersson, H. , Sawatdee, A. , Öhman, R. , Eriksson, J. & Genchel, T. (2019). Enabling paper-based flexible circuits with aluminium and copper conductors. IOP Flexible and Printed Electronics, vol. 4  

Olsen, M. , Zhang, R. , Örtegren, J. , Andersson, H. , Yang, Y. & Olin, H. (2019). Frequency and voltage response of a wind-driven fluttering triboelectric nanogenerator. Scientific Reports, vol. 9: 1    

Zhang, R. , Hummelgård, M. , Örtegren, J. , Olsen, M. , Andersson, H. & Olin, H. (2019). Interaction of the human body with triboelectric nanogenerators. Nano Energy, vol. 57, ss. 279-292.  

Andersson, H. , Šuly, P. , Thungström, G. , Engholm, M. , Zhang, R. , Mašlík, J. & Olin, H. (2019). PEDOT : PSS thermoelectric generators printed on paper substrates. Journal of Low Power Electronics and Applications, vol. 9: 2    

Ahmad, J. , Andersson, H. & Sidén, J. (2019). Screen Printed Piezoresistive Sensors for Monitoring Pressure Distribution in Wheelchair. IEEE Sensors Journal, vol. 19: 6, ss. 2055-2063.  

Zhang, R. , Hummelgård, M. , Örtegren, J. , Yang, Y. , Andersson, H. , Balliu, E. , Blomquist, N. , Engholm, M. & et al. (2019). Sensing body motions based on charges generated on the body. Nano Energy, vol. 63  

Li, X. , Sidén, J. , Andersson, H. & Schön, T. (2018). A Paper-Based Screen Printed HF RFID Reader Antenna System. IEEE Journal of Radio Frequency Identification, vol. 2: 3, ss. 118-126.  

Hammarling, K. , Engholm, M. , Andersson, H. , Sandberg, M. & Nilsson, H. (2018). Broad-Range Hydrogel-Based pH Sensor with Capacitive Readout Manufactured on a Flexible Substrate. Chemosensors, vol. 6: 3    

Li, X. , Sidén, J. & Andersson, H. (2018). Flexible Circuits and Materials for Large-Area UHF RFID Reader Antenna Systems. IOP Flexible and Printed Electronics, vol. 3: 1  

Zhang, R. , Örtegren, J. , Hummelgård, M. , Olsen, M. , Andersson, H. & Olin, H. (2018). Harvesting triboelectricity from the human body using non-electrode triboelectric nanogenerators. Nano Energy, vol. 45, ss. 298-303.  

Zhang, R. , Engholm, M. , Hummelgård, M. , Andersson, H. , Örtegren, J. & Olin, H. (2018). High-performance transparent and flexible electrodes made by flash-light sintering of gold nanoparticles. ACS Applied Energy Materials, vol. 1: 12, ss. 7191-7198.  

Zhang, R. , Hummelgård, M. , Örtegren, J. , Olsen, M. , Andersson, H. , Yang, Y. & Olin, H. (2018). Human body constituted triboelectric nanogenerators as energy harvesters, code transmitters and motion sensors. ACS Applied Energy Materials, vol. 1: 6, ss. 2955-2960.  

Zhang, R. , Hummelgård, M. , Forsberg, V. , Andersson, H. , Engholm, M. , Öhlund, T. , Olsen, M. , Örtegren, J. & et al. (2018). Photoconductivity of acid exfoliated and flash-light-processed MoS2 films. Scientific Reports, vol. 8    

Olsen, M. , Örtegren, J. , Zhang, R. , Reza, S. , Andersson, H. & Olin, H. (2018). Schottky model for triboelectric temperature dependence. Scientific Reports, vol. 8: 1    

Balliu, E. , Andersson, H. , Engholm, M. , Öhlund, T. , Nilsson, H. & Olin, H. (2018). Selective laser sintering of inkjet-printed silver nanoparticle inks on paper substrates to achieve highly conductive patterns. Scientific Reports, vol. 8: 1    

Li, X. , Andersson, H. , Sidén, J. & Schön, T. (2018). Soldering surface mount components on screen printed Ag patterns on paper and Polyimide substrates for hybrid printed electronics. Flexible and Printed Electronics, vol. 3: 1  

Hammarling, K. , Sandberg, M. , Engholm, M. , Andersson, H. & Nilsson, H. (2018). Synthesis, Curing Behavior and Swell Tests of pH-Responsive Coatings from Acryl-Terminated Oligo(beta-Amino Esters). CHEMOSENSORS, vol. 6: 1    

Forsberg, V. , Zhang, R. , Andersson, H. , Bäckström, J. , Dahlström, C. , Norgren, M. , Andres, B. & Olin, H. (2016). Liquid Exfoliation of Layered Materials in Water for Inkjet Printing. Journal of Imaging Science and Technology, vol. 60: 4, ss. 1-7.  

Andersson, H. , Sidén, J. , Skerved, V. , Li, X. & Gyllner, L. (2016). Soldering Surface Mount Components onto Inkjet Printed Conductors on Paper Substrate using Industrial Processes. IEEE Transactions on Components, Packaging, and Manufacturing Technology, vol. 6: 3, ss. 478-485.  

Öhlund, T. , Schuppert, A. , Andres, B. , Andersson, H. , Forsberg, S. , Schmidt, W. , Nilsson, H. , Andersson, M. & et al. (2015). Assisted sintering of silver nanoparticle inkjet inks on paper with active coatings. RSC Advances, vol. 5, ss. 64841-64849.      

Andersson, H. , Manuilskiy, A. , Haller, S. , Hummelgård, M. , Sidén, J. , Hummelgård, C. , Olin, H. & Nilsson, H. (2014). Assembling surface mounted components on ink-jet printed double sided paper circuit board. Nanotechnology, vol. 25, ss. Art. no. 094002  

Andersson, H. , Manuilskiy, A. , Sidén, J. , Gao, J. , Hummelgård, M. , Kunninmel, G. & Nilsson, H. (2014). Chemically programmed ink-jet printed resistive WORM memory array and readout circuit. Materials Research Express, vol. 1: 3, ss. 035021  

Andersson, H. , Manuilskiy, A. , Gao, J. , Lidenmark, C. , Sidén, J. , Forsberg, S. , Unander, T. & Nilsson, H. (2014). Investigation of Humidity Sensor Effect in Silver Nanoparticle Ink Sensors Printed on Paper. IEEE Sensors Journal, vol. 14: 3, ss. Art. no. 6615915  

Zhang, R. , Andersson, H. , Olsen, M. , Hummelgård, M. , Edvardsson, S. , Nilsson, H. & Olin, H. (2014). Piezoelectric gated ZnO nanowire diode studied by in situ TEM probing. Nano Energy, vol. 3, ss. 10-15.  

Zhang, R. , Andersson, H. , Andersson, M. , Andres, B. , Edlund, H. , Edström, P. , Edvardsson, S. , Forsberg, S. & et al. (2013). Soap-film coating : High-speed deposition of multilayer nanofilms. Scientific Reports, vol. 3, ss. Art. no. 1477    

Andersson, H. , Manuilskiy, A. , Lidenmark, C. , Gao, J. , Öhlund, T. , Forsberg, S. , Örtegren, J. , Schmidt, W. & et al. (2013). The influence of paper coating content on room temperature sintering of silver nanoparticle ink. Nanotechnology, vol. 24: 45, ss. Art. no. 455203  

Andersson, H. , Andres, B. , Manuilskiy, A. , Forsberg, S. , Hummelgård, M. , Bäckström, J. , Zhang, R. & Olin, H. (2012). Contacting paper-based supercapacitors to printed electronics on paper substrates. Nordic Pulp & Paper Research Journal, vol. 27: 2, ss. 476-480.    

Andersson, H. , Lidenmark, C. , Öhlund, T. , Örtegren, J. , Manuilskiy, A. , Forsberg, S. & Nilsson, H. (2012). Evaluation of coatings applied to flexible substrates to enhance quality of ink jet printed silver nano-particle structures. IEEE Transactions on Components, Packaging, and Manufacturing Technology, Part C, vol. 2: 2, ss. 342-348.  

Andersson, H. , Manuilskiy, A. , Unander, T. , Lidenmark, C. , Forsberg, S. & Nilsson, H. (2012). Inkjet printed silver nanoparticle humidity sensor with memory effect on paper. IEEE Sensors Journal, vol. 12: 6, ss. 1901-1905.  

Andersson, H. , Hammarling, K. , Sidén, J. , Manuilskiy, A. , Öhlund, T. & Nilsson, H. (2012). Modified EAS Tag Used as a Resistive Sensor Platform. Electronics, vol. 1: 2, ss. 32-46.    

Andres, B. , Forsberg, S. , Vilches, A. P. , Zhang, R. , Andersson, H. , Hummelgård, M. , Bäckström, J. & Olin, H. (2012). Supercapacitors with graphene coated paper electrodes. Nordic Pulp & Paper Research Journal, vol. 27: 2, ss. 481-485.    

Nilsson, H. , Unander, T. , Andersson, H. , Manuilskiy, A. , Sidén, J. & Gulliksson, M. (2012). System integration of electronic functions in smart packaging applications. IEEE Transactions on Components, Packaging and Manufacturing Technology, vol. 2: 10, ss. 1723-1734.  

Nilsson, H. , Andersson, H. , Manuilskiy, A. , Unander, T. , Hammarling, K. , Sidén, J. & Gulliksson, M. (2011). Printed write once and read many sensor memories in smart packaging applications. IEEE Sensors Journal, vol. 11: 9, ss. 1759-1767.  

Andersson, H. , Rusu, A. , Manuilskiy, A. , Haller, S. , Ayöz, S. & Nilsson, H. (2011). System of nano-silver inkjet printed memory cards and PC card reader and programmer. Microelectronics Journal, vol. 42: 1, ss. 21-27.  

Andersson, H. , Manuilskiy, A. , Thungström, G. , Lundgren, A. & Nilsson, H. (2009). Principle of FT Spectrometer based on a Lateral Effect Position Sensitive Detector and Multi Channel Fabry-Perot Interferometer. Measurement, vol. 42: 5, ss. 668-671.  

Andersson, H. , Bylund, N. , Thungström, G. & Nilsson, H. (2008). Analysis and improvement of the position nonlinearity caused by a residual stress in MOS-type position-sensitive detectors with indium tin oxide gate contact. Semiconductor Science and Technology, vol. 23: 7, ss. 1-10.  

Andersson, H. , Thungström, G. & Nilsson, H. (2008). Electroless deposition and silicidation of Ni contacts into p-type Porous Silicon. Journal of porous materials, vol. 15: 3, ss. 335-341.  

Andersson, H. , Manuilskiy, A. , Thungström, G. & Nilsson, H. (2008). Evaluation of an Integrated Fourier-Transform Spectrometer Utilizing a Lateral Effect Position Sensitive Detector with a Multi-Channel Fabry-Perot Interferometer. Measurement science and technology, vol. 19: 4, ss. 045306  

Andersson, H. , Bertilsson, K. , Thungström, G. & Nilsson, H. (2008). Processing and Characterization of a MOS Type Tetra Lateral Position Sensitive Detector with Indium Tin Oxide Gate Contact. IEEE Sensors Journal, vol. 8: 9-10, ss. 1704-1709.  

Andersson, H. , Mattsson, C. , Thungström, G. , Lundgren, A. & Nilsson, H. (2006). The effect of mechanical stress on lateral-effect position sensitive detector characteristics. Nuclear Instruments and Methods in Physics Research Section A, vol. 563: 1, ss. 150-154.  

Andersson, H. , Thungström, G. , Lundgren, A. & Nilsson, H. (2004). Processing and characterization of a position sensitive lateral-effect metal oxide semiconductor detector. Nuclear Instruments and Methods in Physics Research Section A, vol. 531: 1-2, ss. 140-146.  

Artiklar, forskningsöversikter

Zhang, R. , Örtegren, J. , Hummelgård, M. , Olsen, M. , Andersson, H. & Olin, H. (2022). A review of the advances in composites/nanocomposites for triboelectric nanogenerators. Nanotechnology, vol. 33: 21  

Zhang, R. , Hummelgård, M. , Örtegren, J. , Olsen, M. , Andersson, H. , Yang, Y. , Zheng, H. & Olin, H. (2021). The triboelectricity of the human body. Nano Energy, vol. 86    

Maslik, J. , Andersson, H. , Forsberg, V. , Engholm, M. , Zhang, R. & Olin, H. (2018). PEDOT:PSS temperature sensor ink-jet printed on paper substrate. Journal of Instrumentation, vol. 13  

Doktorsavhandlingar

Andersson, H. (2008). Position Sensitive Detectors : Device Technology and Applications in Spectroscopy. Diss. (Sammanläggning) Institutionen för informationsteknologi och medier, 2008 (Mid Sweden University doctoral thesis : 48)  

Konferensbidrag

Zhang, R. , Hummelgård, M. , Örtegren, J. , Andersson, H. , Olsen, M. , Eivazihollagh, A. , Dahlström, C. , Norgren, M. & et al. (2023). Wastepaper-based Triboelectric Nanogenerators. I Book of Abstracts EPNOE 2023.

Ahmad, J. , Sidén, J. & Andersson, H. (2021). Stretchable Pressure Sensor Using Thermoplastic Polyurethane and Conductive Inks. I Proceedings of IEEE Sensors.  

Ahmad, J. , Li, X. , Sidén, J. & Andersson, H. (2019). An Analysis of Screen-Printed Stretchable Conductive Tracks on Thermoplastic Polyurethane. I FLEPS 2019 - IEEE International Conference on Flexible and Printable Sensors and Systems, Proceedings.    

Li, X. , Sidén, J. , Andersson, H. , Ahmad, J. , Sawatdee, A. , Öhman, R. , Eriksson, J. & Genchel, T. (2019). Flexible Circuits Based on Aluminum Conductor and Nonwoven Substrate. I 2019 IEEE International Flexible Electronics Technology Conference (IFETC).. S. 1--4.    

Zhang, R. , Olin, H. , Hummelgård, M. , Olsen, M. , Andersson, H. , Dahlström, C. & Örtegren, J. (2019). Towards large area energy harvesting using triboelectric nangenerators fabricated with green materials. Paper presented at the NENS 2019 The 4th International Conference on Nanoenergy and Nanosystems, June 15-17, 2019 Beijing, China

Forsberg, V. , Andersson, H. , Engholm, M. , Thungström, G. , Zhang, R. , Hummelgård, M. , Olin, H. & Norgren, M. (2018). Photodetector of multilayer exfoliated MoS2 deposited on polyimide films. Paper presented at the 20th International Workshop on Radiation Imaging Detectors, Sundsvall, 24-28 June, 2018

Forsberg, V. , Maslik, J. , Andersson, H. , Hummelgård, M. , Dahlström, C. , Toivakka, M. , Koppolu, R. , Olin, H. & et al. (2018). Printability of functional inkjet inks onto commercial inkjet substrates and a taylor made pigmented coated paper. Paper presented at the E-MRS, European Materials Research Society Spring Meeting 2018, Strasbourg, France, June 18-22, 2018

Mazlik, J. , Andersson, H. , Forsberg, V. , Engholm, M. , Zhang, R. & Olin, H. (2018). Temperature sensor based on PEDOT : PSS ink-jet printed on paper substrate. Paper presented at the 20th International Workshop on Radiation Imaging Detectors, Sundsvall, 24-28 June, 2018

Ahmad, J. , Andersson, H. & Sidén, J. (2017). Sitting Posture Recognition using Screen Printed Large Area Pressure Sensors. I Proceedings of IEEE Sensors. (IEEE Sensors). S. 232--234.  

Brugés Martelo, J. M. , Andersson, M. , Andersson, H. & Lundgren, J. (2017). Surface topography characterization of high-quality PE coated paperboard using confocal chromatic microscope and 3D SEM stereo-photogrammetry technique. Paper presented at the 16th International Conference on Metrology and Properties of Engineering Surfaces, Gothenburg, Sweden, June 27-29, 2017

Li, X. , Sidén, J. & Andersson, H. (2017). UHF RFID Shelf Reader Antennas for Object Classification and Distance Estimation of Non-Tagged RFID Objects. I 2017 Ieee International Conference On Microwaves, Antennas, Communications And Electronic Systems (Comcas). (IEEE International Conference on Microwaves Communications Antennas and Electronic Systems). S. 289--292.

Balliu, E. , Andersson, H. , Engholm, M. , Zhang, R. , Forsberg, S. & Olin, H. (2016). Laser processing of graphene oxide on different coated paper substrates. I 14th TAPPI Advanced Coating Symposium 2016.. S. 97--101.

Balliu, E. , Andersson, H. , Engholm, M. , Forsberg, S. & Olin, H. (2016). Laser-assisted reduction of graphene oxide for paper based large area flexible electronics. I Proceedings of SPIE - The International Society for Optical Engineering.  

Forsberg, V. , Zhang, R. , Andersson, H. , Bäckström, J. , Dahlström, C. , Norgren, M. , Andres, B. & Olin, H. (2016). Liquid Exfoliation of Layered Materials in Water for Inkjet Printing. I Printing for Fabrication 2016 : Materials, Applications, and Processes. USA :

Balliu, E. , Andersson, H. , Hummelgård, M. , Olin, H. & Engholm, M. (2015). Laser sintering of silver nano-particles inks printed on paper substrates. I Proceedings of SPIE - The International Society for Optical Engineering.. S. Art. no. 935112-  

Sidén, J. , Xiaotian, L. & Andersson, H. (2015). Microstrip Antenna Matrix for RFID Positioning over Large Surfaces. I Proc. IEEE RFID 2015.

Sidén, J. , Skerved, V. & Andersson, H. (2015). Sensing and Actuating with NFC. Paper presented at the IEEE International Conference on RFID,San Diego, April 15-17, 2015

Alecrim, V. , Zhang, R. , Hummelgård, M. , Andersson, H. , Andersson, M. & Olin, H. (2014). Photoconductivity of bulk and liquid processed MoS₂. Paper presented at the 1st International Conference on Two Dimensional Materials  

Zhang, R. , Andersson, H. , Andersson, M. , Andres, B. , Edström, P. , Edvardsson, S. , Forsberg, S. , Hummelgård, M. & et al. (2013). High-speed deposition of multilayer nanofilms using soap-film coating. Paper presented at the 19th International Vacuum Congress (IVC-19), Paris, France, September 9-13 2013

Örtegren, J. , Öhlund, T. , Niga, P. , Makeen, K. , Andersson, H. & Nilsson, H. (2012). Print quality issues concerning inkjet printing of colour and electronics on paper. I PTS Symposium: Paper and Imaging 2012. Munich, Germany : . S. 251--263.

Sidén, J. , Gao, J. , Unander, T. , Andersson, H. , Jonsson, P. , Nilsson, H. & Gulliksson, M. (2011). Electric and Electromagnetic Coupled Sensor Components for Passive RFID. I 2011 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems, COMCAS 2011.. S. 1--5.  

Andersson, H. , Öhlund, T. , Manuilskiy, A. , Forsberg, S. , Örtegren, J. & Nilsson, H. (2010). Evaluation of InkAid surface treatment to enhance print quality of ANP silver nano-particle ink on plastic substrates. I Large Area, Organic & Printed Electronics (LOPE-C) 2010. Frankfurt : . S. 241--245.

Alastalo, A. , Mattila, T. , Leppäniemi, J. , Suhonen, M. , Kololuomo, T. , Schaller, A. , Andersson, H. , Manuilskiy, A. & et al. (2010). Printable WORM and FRAM memories and their applications. I Large area, organic & printed electronics (LOPE-C) 2010.. S. 8--12.

Öhlund, T. , Örtegren, J. , Andersson, H. & Nilsson, H. (2010). The importance of surface characteristics for structure definition of silver nanoparticle ink patterns on paper surfaces. I NIP26 and Digital Fabrication. Austin : . S. 309--313.

Öhlund, T. , Örtegren, J. , Andersson, H. & Nilsson, H. (2009). Sintering Methods for Metal Nanoparticle Inks on Flexible Substrates. I NIP 25: DIGITAL FABRICATION 2009, TECHNICAL PROGRAM AND PROCEEDINGS.. S. 614--617.

Andersson, H. , Manuilskiy, A. , Thungström, G. & Nilsson, H. (2008). Broadband Parameters of Compact FT Spectrometer based on Fabry-Perot Interferometer Integrated with detector.

Manuilskiy, A. , Andersson, H. , Thungström, G. & Nilsson, H. (2006). Compact Multi Channel Optical Fourier Spectrometer. I Proceedings of SPIE - The International Society for Optical Engineering. (PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE)). S. U34--U43.    

Manuilskiy, A. , Andersson, H. , Thungström, G. & Nilsson, H. (2006). Multi Channel Array Interferometer-Fourier Spectrometer. I 2006 Northern Optics Conference Proceedings. New York : . S. 1--6.

Manuilskiy, A. , Andersson, H. , Thungström, G. & Nilsson, H. (2006). New concept of compact optical Fourier-Transform spectrometer. I 2006 IEEE SENSORS, VOLS 1-3. (IEEE Sensors). S. 408--411.  

Licentiatavhandlingar

Andersson, H. (2007). Development of Process Technology for Photon Radiation Measurement Applications. Lic.-avh. (Sammanläggning) Sundsvall : Mittuniversitetet, 2007 (Mid Sweden University licentiate thesis : 16)

Manuskript

Li, X. , Andersson, H. & Sidén, J. Low-Resistance Screen-Printed Nanoparticle Ink Tracks for High-Current Applications.

Dataset

Ahmad, J. , Li, X. , Sidén, J. & Andersson, H. (2019). An Analysis of Screen-Printed Stretchable Conductive Tracks on Thermoplastic Polyurethane.