The Experts below are selected from a list of 246 Experts worldwide ranked by ideXlab platform

Neil Hopkinson - One of the best experts on this subject based on the ideXlab platform.

  • Use of an Alternative Ink in the High Speed Sintering Process
    Solid Freeform Fabrication Proceedings, 2015
    Co-Authors: Luke Fox, Adam Ellis, Neil Hopkinson
    Abstract:

    High Speed Sintering is a polymer Additive Manufacturing process, which builds parts by the use of inkjet printing and Infrared Lamp technology, as opposed to lasers and optics used in Laser Sintering. For High Speed Sintering to be a viable method to build fast moving consumer goods the ability to use different inks is critical. This research investigated the effects of using two separate inks in the High Speed Sintering process. This work shows it is possible to use inks from different suppliers, which opens up a wider supply chain.

  • High speed sintering - continuing research into a new rapid manufacturing process
    Solid Freeform Fabrication Symposium Proceedings, 2007
    Co-Authors: H.r. Thomas, Neil Hopkinson, Poonjolai Erasenthiran
    Abstract:

    High Speed Sintering (HSS) is an emerging layer manufacturing technique aiming to break into the lucrative field of Rapid Manufacturing (RM). The process is likened to Selective Laser Sintering (SLS), however, instead of a laser dictating the sintered cross sectional area of each layer, the desired area is first printed using a Radiation Absorbing Material (RAM) and then sintered using an inexpensive Infrared Lamp. This paper begins by describing the sintering process in more detail and then outlining the overall manufacturing cycle. It then continues by describing the experiments performed to investigate the current problem concerning the hardness of excess powder within the powder bed. This problem arose due to the continual exposure of the whole bed to Infrared radiation from the Lamp. The experiments showed that as the power of the IR Lamp increased, the hardness of the bed also increased. Furthermore, at higher IR power levels it was found the excess powder produced a solid tile which could only be broken down by a glass bead blaster.

Luke Fox - One of the best experts on this subject based on the ideXlab platform.

  • Use of an Alternative Ink in the High Speed Sintering Process
    Solid Freeform Fabrication Proceedings, 2015
    Co-Authors: Luke Fox, Adam Ellis, Neil Hopkinson
    Abstract:

    High Speed Sintering is a polymer Additive Manufacturing process, which builds parts by the use of inkjet printing and Infrared Lamp technology, as opposed to lasers and optics used in Laser Sintering. For High Speed Sintering to be a viable method to build fast moving consumer goods the ability to use different inks is critical. This research investigated the effects of using two separate inks in the High Speed Sintering process. This work shows it is possible to use inks from different suppliers, which opens up a wider supply chain.

Jing Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Deep color, heat-reflective, superhydrophobic and anti-soiling coatings with waterborne silicone emulsion
    Solar Energy Materials and Solar Cells, 2019
    Co-Authors: Lingdong Chen, Jian Lv, Jing Zhang, Jie. Feng
    Abstract:

    Abstract Recently, deep colored inorganic pigments with high Infrared reflectance have attracted much attention for using in the building coating field because of their ability to reflect solar heat radiation and reduce the temperature of the roofs and outside walls. However, pollutants that are present in the air require the coatings to possess self-cleaning and anti-soiling properties. In this work, black Infrared-reflective pigments, fluorinated acrylic resin emulsion and a small number of SiO2 nanoparticles were mixed in silicon resin emulsion, and the resulting mixture was coated on an aluminum plate. After drying, black coatings with high Infrared reflectance, superhydrophobic (SH) and obvious anti-soiling properties were created. Between wavelengths of 1250–2500 nm, the Infrared-reflectivity of the prepared cool coating is higher than that of the white SiO2 coatings. Under the radiation of a 275-Watt Infrared Lamp positioned at a height of 40 cm, the surface temperature of the cool coating is 30 °C lower than that of the carbon black coating (90 °C), and only 5–10 °C higher than that of the white SiO2 coating. Furthermore, the heat-reflective coating exhibited stable SH properties to both rain and UV irradiation, which allow for the coating to possess self-cleaning ability and retain its heat-reflective properties over a long period of time.

  • Dark, Infrared Reflective, and Superhydrophobic Coatings by Waterborne Resins.
    Langmuir, 2018
    Co-Authors: Jing Zhang, Weicheng Zhang, Jian Lv, Jie. Feng
    Abstract:

    Recently, Infrared reflective pigments possessing deep colors have attracted much attention. However, in polluted air, the coatings consisting of such pigments are easily contaminated which abates Infrared reflectivity. In this work, black and Infrared reflective pigments, fluorine silicon sol and a small number of SiO2 nanoparticles were introduced into waterborne epoxy resin emulsion and then coated on an aluminum plate. After drying, black coatings with Infrared reflective and superhydrophobic (SH) properties were obtained. The average near-Infrared (NIR) reflectivity of the coating over wavelength range of 780–2600 nm can reach 68%, which is much larger than that of carbon black coatings and even approaches that of white nano SiO2 coatings. Under the irradiation of a 275-W Infrared Lamp (with height 40 cm), the surface temperature of the coating is 63 °C, which is much lower than that of the carbon black coating (90 °C) and only 7 °C higher than that of the white nano SiO2 coating. Furthermore, the NI...

  • A low complexity method for real-time gaze tracking
    2008 IEEE 10th Workshop on Multimedia Signal Processing, 2008
    Co-Authors: Jing Zhang, Mengkai Zhao, Li Zhuo, Lansun Shen
    Abstract:

    The paper addresses a novel, fast and low complexity gaze tracking method, which remedies computation complexity and real-time processing problems of most existing gaze tracking methods. Face images are captured and pre-processed under Infrared Lamp-houses with dual thresholds. Pupil area is verified by the run-length in eight directions, and the gaze point is located by mapping the vectors of pupil and reflection point or using neural network. The experimental results show that the real-time processing of gaze tracking, with high resolution and high accuracy simultaneously, is achieved in this new system.

Adam Ellis - One of the best experts on this subject based on the ideXlab platform.

  • Use of an Alternative Ink in the High Speed Sintering Process
    Solid Freeform Fabrication Proceedings, 2015
    Co-Authors: Luke Fox, Adam Ellis, Neil Hopkinson
    Abstract:

    High Speed Sintering is a polymer Additive Manufacturing process, which builds parts by the use of inkjet printing and Infrared Lamp technology, as opposed to lasers and optics used in Laser Sintering. For High Speed Sintering to be a viable method to build fast moving consumer goods the ability to use different inks is critical. This research investigated the effects of using two separate inks in the High Speed Sintering process. This work shows it is possible to use inks from different suppliers, which opens up a wider supply chain.

J. Scheid - One of the best experts on this subject based on the ideXlab platform.

  • In Situ Apparatus to Study Gas–Metal Reactions and Wettability at High Temperatures for Hot-Dip Galvanizing Applications
    Journal of Materials Engineering and Performance, 2018
    Co-Authors: A. Koltsov, M.-j. Cornu, J. Scheid
    Abstract:

    The understanding of gas–metal reactions and related surface wettability at high temperatures is often limited due to the lack of in situ surface characterization. Ex situ transfers at low temperature between annealing furnace, wettability device, and analytical tools induce noticeable changes of surface composition distinct from the reality of the phenomena.Therefore, a high temperature wettability device was designed in order to allow in situ sample surface characterization by x-rays photoelectron spectroscopy after gas/metal and liquid metal/solid metal surface reactions. Such airless characterization rules out any contamination and oxidation of surfaces and reveals their real composition after heat treatment and chemical reaction. The device consists of two connected reactors, respectively, dedicated to annealing treatments and wettability measurements. Heat treatments are performed in an Infrared Lamp furnace in a well-controlled atmosphere conditions designed to reproduce gas–metal reactions occurring during the industrial recrystallization annealing of steels. Wetting experiments are carried out in dispensed drop configuration with the precise control of the deposited droplets kinetic energies. The spreading of drops is followed by a high-speed CCD video camera at 500-2000 frames/s in order to reach information at very low contact time. First trials have started to simulate phenomena occurring during recrystallization annealing and hot-dip galvanizing on polished pure Fe and FeAl8 wt.% samples. The results demonstrate real surface chemistry of steel samples after annealing when they are put in contact with liquid zinc alloy bath during hot-dip galvanizing. The wetting results are compared to literature data and coupled with the characterization of interfacial layers by FEG-Auger. It is fair to conclude that the results show the real interest of such in situ experimental setup for interfacial chemistry studies.