The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform

Mustafa Guden - One of the best experts on this subject based on the ideXlab platform.

  • quasi static axial crushing of extruded Polystyrene Foam filled thin walled aluminum tubes experimental and numerical analysis
    Materials & Design, 2006
    Co-Authors: Levent Aktay, Ahmet Kaan Toksoy, Mustafa Guden
    Abstract:

    Abstract The experimental and numerical quasi-static crushing responses of extruded closed cell Polystyrene Foam-filled thin-walled aluminum tubes were investigated. The numerical crash analysis of empty and Foam-filled tubes was performed using the explicit finite element code PAM-CRASH™. Satisfactory agreements were generally achieved between the finite element model and experimental deformed shapes, load–displacements, fold lengths and specific energy absorptions. The model and experiments have also highlighted the several effects of Foam filling on the crushing of thin-walled tubes. The energy absorptions in Foam-filled tubes were further shown to be higher than the sum of the energy absorptions of empty tube (alone) and filler (alone).

  • the strengthening effect of Polystyrene Foam filling in aluminum thin walled cylindrical tubes
    Thin-walled Structures, 2005
    Co-Authors: Ahmet Kaan Toksoy, Mustafa Guden
    Abstract:

    The strengthening effect of Foam filling in thin-walled circular tubes, deforming in diamond and concertina modes, was investigated in Polystyrene Foam filled aluminum tubes. Empty tubes of two different diameters (16 and 25 mm) deformed in diamond mode, while Foam filling changed the deformation mode into concertina in 25 mm tube due to thickening effect of Foam filling. The strengthening coefficient in concertina mode was found around unity, while in diamond mode it was greater than unity. In concertina mode, Foam and tube were observed to deform independently. However, in diamond mode, Foam was compressed in between the folds, leading to a higher strengthening coefficient. The effects of deformation rate and the use adhesive on the average crushing loads of the filled tubes were also determined.

Hiroyuki Shinoda - One of the best experts on this subject based on the ideXlab platform.

  • refriction remote friction control on Polystyrene Foam by ultrasound phased array
    International Conference on Computer Graphics and Interactive Techniques, 2019
    Co-Authors: Task Ohmori, Yu Someya, Masahiro Fujiwara, Yasutoshi Makino, Hiroyuki Shinoda
    Abstract:

    We propose a system that can remotely change the friction feel of the Polystyrene Foam surface using an Airborne Ultrasound Tactile Display (AUTD). In previous studies, the superficial friction of an object is mainly controlled by ultrasonic vibration of an object to reduce the friction using the squeeze film effect or by static electricity to increase superficial friction. In contrast to these studies, our approach changes the friction remotely, thus no device is needed on the target surface. This allows the tactile display to be a large screen or disposable, which can be used as an intuitive touch panel in applications where hygiene is important, such as during surgery. Furthermore, changing the surface friction of three-dimensional objects of any shape is also considered as another application. In this system, the position of the fingertip is detected by a device (Xperia Touch) equipped with a projector and a fingertip detection sensor, and the ultrasound focus is changed according to the fingertip position in real time using AUTD. As a result, the feel of friction on the Polystyrene Foam is altered by the focused ultrasound. Various friction patterns can be presented according to the image of the projector.

  • SIGGRAPH ASIA Emerging Technologies - ReFriction: Remote friction control on Polystyrene Foam by ultrasound phased array
    SIGGRAPH Asia 2019 Emerging Technologies, 2019
    Co-Authors: Task Ohmori, Yu Someya, Masahiro Fujiwara, Yasutoshi Makino, Hiroyuki Shinoda
    Abstract:

    We propose a system that can remotely change the friction feel of the Polystyrene Foam surface using an Airborne Ultrasound Tactile Display (AUTD). In previous studies, the superficial friction of an object is mainly controlled by ultrasonic vibration of an object to reduce the friction using the squeeze film effect or by static electricity to increase superficial friction. In contrast to these studies, our approach changes the friction remotely, thus no device is needed on the target surface. This allows the tactile display to be a large screen or disposable, which can be used as an intuitive touch panel in applications where hygiene is important, such as during surgery. Furthermore, changing the surface friction of three-dimensional objects of any shape is also considered as another application. In this system, the position of the fingertip is detected by a device (Xperia Touch) equipped with a projector and a fingertip detection sensor, and the ultrasound focus is changed according to the fingertip position in real time using AUTD. As a result, the feel of friction on the Polystyrene Foam is altered by the focused ultrasound. Various friction patterns can be presented according to the image of the projector.

P.c.m. Planken - One of the best experts on this subject based on the ideXlab platform.

  • terahertz dielectric properties of Polystyrene Foam
    Journal of The Optical Society of America B-optical Physics, 2002
    Co-Authors: G. Zhao, M. Ter Mors, Tom Wenckebach, P.c.m. Planken
    Abstract:

    We have performed terahertz time-domain spectroscopy measurements on three types of Polystyrene Foam. We find that between 0.2 and 4 THz, the extinction of this material is low and that it has a remarkably low refractive index of 1.017 to 1.022 in this range, with little variation as a function of frequency. In Foam produced with HCFC 142b gas (1-chloro-1,1-difluoroethane) as the blowing agent, we find an additional absorption band at 0.5 THz caused by rotational transitions in this gas. The low extinction and refractive index make Polystyrene Foam a very suitable material to be used as a dichroic filter that blocks the near-IR and transmits THz radiation with small losses of less than 1.5 cm-1 for frequencies of <4 THz, and as a substrate for THz imaging.

  • Terahertz dielectric properties of Polystyrene Foam
    Journal of The Optical Society of America B-optical Physics, 2002
    Co-Authors: G. Zhao, M. Ter Mors, Tom Wenckebach, P.c.m. Planken
    Abstract:

    We have performed terahertz time-domain spectroscopy measurements on three types of Polystyrene Foam. We find that between 0.2 and 4 THz, the extinction of this material is low and that it has a remarkably low refractive index of 1.017 to 1.022 in this range, with little variation as a function of frequency. In Foam produced with HCFC 142b gas (1-chloro-1,1-difluoroethane) as the blowing agent, we find an additional absorption band at 0.5 THz caused by rotational transitions in this gas. The low extinction and refractive index make Polystyrene Foam a very suitable material to be used as a dichroic filter that blocks the near-IR and transmits THz radiation with small losses of less than 1.5 cm-1 for frequencies of

  • THz near-invisible materials: the dielectric properties of Polystyrene Foam
    Summaries of Papers Presented at the Lasers and Electro-Optics. CLEO '02. Technical Diges, 2002
    Co-Authors: G. Zhao, M. Ter Mors, W.t. Wenckebach, P.c.m. Planken
    Abstract:

    Summary form only given. We show results on THz-TDS measurements on Polystyrene Foam which demonstrate that this material has dielectric properties that make it very suitable for many THz applications. We have measured the frequency-dependent extinction and refractive index of three kinds of Polystyrene Foam.

M L Tawfic - One of the best experts on this subject based on the ideXlab platform.

  • Mechanical, flammability and thermal degradation characteristics of rice straw fiber-recycled Polystyrene Foam hard wood composites incorporating fire retardants
    Journal of Thermal Analysis and Calorimetry, 2018
    Co-Authors: S B Eskander, M E Tawfik, M L Tawfic
    Abstract:

    Hard wood–polymer composite (HWC) was prepared, based on hot press technique, by mixing air-dried rice straw waste as a filler into a molten of chemically recycled extended Polystyrene Foam waste (PS) and its maleated form (PS-g-MA) as a matrix. Two fire retardants (FRs), namely zinc borate (ZB) and/or anhydrous magnesium hydroxide (MH), were dispersed into the composite to compensate for the poor thermal stability and flammability of the composite. Thermal properties of the reached HWC were evaluated by different techniques including thermogravimetric analysis, differential scanning calorimetric, in addition to, flammability analyses. Mechanical characterization was, also, rated based on tensile strength and elongation at break measurements. It was found that incorporation of the nominated fire retardants improved the thermal stability of the final products. Besides, flammability resistance was enhanced as ZB and/or MH was added to the hard wood–polymer composite formulation. The onset temperature of degradation and mass loss rates were significantly reduced in the presence of the FRs. The tensile strength of HWC was reinforced by marked additions of the FRs. The obtained data can fulfill the required optimal performance of the HWC to fire and mechanical characterizations which are necessary for many applications in the residential construction, transportation and furniture industries.

Ya Xiong - One of the best experts on this subject based on the ideXlab platform.

  • adsorption performance of hollow spherical sludge carbon prepared from sewage sludge and Polystyrene Foam wastes
    ACS Sustainable Chemistry & Engineering, 2015
    Co-Authors: Zhijian Wu, Lingjun Kong, Hang Hu, Shuanghong Tian, Ya Xiong
    Abstract:

    Although sludge carbons have been widely studied, no attention has been paid to the preparation and application of hollow sludge carbon. In this study, innovative hollow spherical sludge carbons (HSCs) were prepared by pyrolyzing Polystyrene Foam sphere @sludge. The precursors, including sewage sludge and Polystyrene Foam, are solid wastes and produced in large volumes around the world. By this method, HSCs with a tunable shell thickness from 0.2 to 2.5 mm were obtained. The batch and column experiments show that the adsorption capacity and rate of HSCs for methylene blue increase with the decrease of the shell thickness, e.g., HSC with 0.2 mm thickness exhibits the highest adsorption capability of 149 mg g–1 and intraparticle diffusion rate constant of 21.5 mg g–1 h–0.5, 2.2 and 3.8 times larger than that of solid sludge carbon, respectively. In addition, two modification methods were proposed to further enhance the adsorption performance of HSCs. Finally, HSCs can be easily recycled and efficiently rege...