International Journal of Materials Science and Applications

Volume 6, Issue 5, September 2017

  • Design for Stable Lasing of an Indirect Injection THz Quantum Cascade Laser Operating at Less Than 2 THz

    Tsung-Tse Lin, Hideki Hirayama

    Issue: Volume 6, Issue 5, September 2017
    Pages: 230-234
    Received: 4 July 2017
    Accepted: 17 July 2017
    Published: 11 August 2017
    Abstract: In order to realize high temperature lasing of low frequency (< 2 THz) terahertz quantum cascade lasers (THz QCLs), selective carrier injection into an upper lasing level using an indirect injection (II) scheme is an effective method for inducing population inversion. The II scheme is realized with a four-level system. However, a three-level sys... Show More
  • Peculiarity of Zr in the Neutron Absorption Cross-section and Corrosion Resistance in Water

    Yoshiharu Mae

    Issue: Volume 6, Issue 5, September 2017
    Pages: 235-240
    Received: 2 August 2017
    Accepted: 15 August 2017
    Published: 28 August 2017
    Abstract: The elements Be, Bi, Mg, Pb, Zr, Al, Ca, Na, Sn, Rb and Ce are the metallic elements of small thermal neutron absorption cross section. Except Be and Zr, they are all soft metals. But the reasons for these small thermal neutron absorption cross-sections are not known. To clarify its mechanism, the thermal neutron absorption cross-sections of elemen... Show More
  • Effect of Chill Wheel Cooling on Magnetic Properties of Nd15Fe77B8 Alloy Powders Produced by Melt Spinning Method

    Sultan Öztürk, Kürşat Icin, Bülent Öztürk, Uğur Topal, Hülya Kaftelen Odabaşi

    Issue: Volume 6, Issue 5, September 2017
    Pages: 241-249
    Received: 14 August 2017
    Accepted: 25 August 2017
    Published: 19 September 2017
    Abstract: In this study, effect of wheel cooling on magnetic properties of Nd15Fe77B8 alloy powders produced by melt spinning method has been investigated. The present method includes the cooling of the copper wheel by externally contacting a coolant block which is cooled by internally circulating freon gas. Within this framework, the effect of wheel tempera... Show More
  • Feedstock Recycling of Plastics Waste for Electricity or Fuel: An Exergy Approach

    Marek Stelmachowski

    Issue: Volume 6, Issue 5, September 2017
    Pages: 250-259
    Received: 5 July 2017
    Accepted: 25 July 2017
    Published: 26 September 2017
    Abstract: Waste plastics contribute to many environmental and social problems due to the loss of natural resources, environmental pollution, depletion of landfill space, and the various demands of an environmentally oriented society. The consumption of plastics waste increases annually, particularly in developing countries. Feedstock recycling of scrap polym... Show More
  • Effect of Cold Work on Creep Rupture Strength of Alloy263

    Naoya Kanno, Yoshiki Shioda, Keiji Kubushiro

    Issue: Volume 6, Issue 5, September 2017
    Pages: 260-268
    Received: 13 September 2017
    Accepted: 22 September 2017
    Published: 13 October 2017
    Abstract: Creep rupture strength and the microstructure change during creep deformation of pre-strained Alloy263 were investigated. Creep rupture tests were conducted at 1023, 1073 K at stress range from 120 to 250 MPa. Creep strength of the pre-strained samples was higher than that of the non-strained samples. However, rupture strain of the pre-strained sam... Show More