Volume 19, Issue 2

 

ارسال های اخیر

  • On Ideals Which Have the Weakly Insertion of Factors Property 

    پدیدآور نامشخص (University of Tehran, 2008-09-01)
    A one-sided ideal of a ring has the insertion of factors property (or simply, IFP) if implies r for . We say a one-sided ideal of has the weakly IFP if for each , implies , for some non-negative integer . ...

  • Bracket Products on Locally Compact Abelian Groups 

    پدیدآور نامشخص (University of Tehran, 2008-09-01)
    We define a new function-valued inner product on L2(G), called ?-bracket product, where G is a locally compact abelian group and ? is a topological isomorphism on G. We investigate the notion of ?-orthogonality, Bessel's ...

  • Solid Solution in the As2S3-Sb2S3 Series at 

    پدیدآور نامشخص (University of Tehran, 2008-09-01)
    Orpiment, getchellite and stibnite from Zarshuran deposit, NW Iran, exhibit extensive As-Sb substitution. There are four known minerals along As2S3-Sb2S3 join, i.e. orpiment (As2S3), Wakabayashilite [(As,Sb)20S30], getchellite ...

  • Preparation of Carbon Nanotubes by CVD Process over Nanoparticles of Ni-Ce-Zr Mixed Oxides 

    پدیدآور نامشخص (University of Tehran, 2008-09-01)
    Carbon nanotubes (CNTs) were prepared by the catalytic chemical vapor deposition of C2H2 at 550°C in 120 minutes using nanoparticles of Ni-Ce-Zr mixed oxides. The CNTs were characterized by X-ray diffraction (XRD), scanning ...

  • Auriferous Sulfides from the Chah-Bagh Gold Occurrence, Muteh Mining District 

    پدیدآور نامشخص (University of Tehran, 2008-09-01)
    The Chah-Bagh gold occurrence is located in Muteh mining district, in the central part of the Sanandaj-Sirjan zone. Gold mineralization occurs in ductile to ductile-brittle shear zones and is comparable with orogenic gold ...