Chiba Institute of Technology

About: Chiba Institute of Technology is a education organization based out in Narashino, Japan. It is known for research contribution in the topics: RNA & Magnet. The organization has 2663 authors who have published 4999 publications receiving 56870 citations. The organization is also known as: Chiba kōgyō daigaku & Kōa Institute of Technology.

Channel modeling of nondirected wireless infrared indoor diffuse link

Abstract: This paper discusses the modeling and broadband design of an indoor infrared wireless communication channel consisting of a nondirected diffusion system. The property of the nondirected diffuse link is analyzed by the ray tracing technique and the modified Monte Carlo method. The physical parameters are directly related to the impulse response of the link and are modeled by a gamma probability density function. The impulse response model and a simulation indicate that it is effective for the broadband link to narrow the radiation angle of the optical source and to expand the receiver field of view to match the ceiling area of the room. © 2007 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 90(6): 9–19, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.20352

Effect of Minor Elements on Grain Size of Mg-9%Al Alloy

Abstract: The Influence of minor elements, such as Be. Zr, Fe and Mn. on grain size and grain-refining effect of Mg-9%Al alloy was investigated by use of high-purity Mg-9%Al alloy (high-purity alloy). This high-purity alloy was prepared from distilled pure magnesium and 99.99% commercial aluminum. Given amounts of Be. Zr, Fe and Mn were then added Microscopic examination clarified that these elements have grain coarsening action for natural fine-grained high-purity alloys, and the grain refinement by superheating was possible as long as the alloy grain was coarsened by Fe or Mn addition EPMA analysis revealed the existence of some species of aluminum carbide in high-purity alloy Fe-Al-C-O and Mn-Al-C-O compounds were also obscrved in allovs coarsc-grained by Fe or Mn addition Existence of aluminum carbide and its change were probably associated with the grain size of the Mg-9%Al alloy.

Polyurethane elastomer-LiClO4 complexes as a polymeric solid electrolyte

Abstract: A polymeric solid electrolyte with high ionic conductivity was prepared by complexing a polyurethane elastomer with LiClO 4 . The ionic conductivity of these complexes increases proportional to the increase of the content of poly(tetramethylene oxide) component in the polyurethane elastomer and with increasing LiClO 4 concentration, and reaches a value of 10 -4 S/cm at 80 o C for [LiClO 4 ]=1,20 mmol/g polymer. The polyurethane elastomer-LiClO 4 complex has good mechanical properties compared with poly(ethylene oxide)- and poly(propylene oxide)-based complexes