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Öğe An assessment of thorium and spent LWR-fuel utilization potential in CANDU reactors(PERGAMON-ELSEVIER SCIENCE LTD, 2004) Sahin, S; Sahin, HM; Alkan, M; Yildiz, KA neutronic analysis has been performed to assess a prospective utilization of light water reactor (LWR) spent fuel in Canada deuterium uranium (CANDU) reactors mixed with thoria (ThO2). The study is conducted for mixture grades with 50%, 60% and 100% LWR spent fuel and 50%, 40% and 0% thoria, respectively. Burn-up grades are evaluated for alternative fuels to reach a bundle criticality of k(infinity) = 1.06, which are calculated as similar to28,000, similar to14;000, similar to8000 and 8800 MW d/MT with 100%, 60% and 50% LWR spent fuel content and for natural uranium fuelled CANDU after plant operation periods of 690, 340, 200 and 205 days, respectively. The presence of even plutonium isotopes with higher neutron absorption cross sections in the LWR spent fuel obliges starting with a higher cumulative fissile inventory in the initial charge compared to natural uranium fuel. Extended utilization of worldwide disposed spent nuclear LWR fuel in CANDU reactors in a symbiotic system opens prospects with respect to environmental concerns as well as to energy economics. After separation of the fission products, further utilization of the actinides in nuclear waste becomes possible as a valuable nuclear fuel. (C) 2003 Elsevier Ltd. All rights reserved.Öğe Characteristics of periodically loaded CPW structures(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1998) Gorur, A; Karpuz, C; Alkan, MA capacitively loaded coplanar waveguide (CPW) resonator has been studied. It has been shown that the proposed resonator can be used to achieve a slow-wave effect without occupying extra surface area and it has a good performance as compared with the conventional half-wavelength CPW resonator, Furthermore, dispersive effects have been increased with the number of slots in periodically loaded structures.Öğe Quasistatic analysis of cylindrical coplanar strip lines(JOHN WILEY & SONS INC, 1998) Karpuz, C; Gorur, A; Alkan, MCAD-oriented analytic formulas are given for calculating the quasistatic parameters of the cylindrical coplanar strip (CCPS) lines. The curvature effects on the quasistatic characteristics of CCPS are investigated by using conformal mapping techniques. The calculated results are compared with those obtained for a corresponding planar CPS and asymmetrical CPS. (C) 1998 John Wiley & Sons, Inc.Öğe Quasistatic analysis of cylindrical coplanar waveguide with multilayer dielectrics(JOHN WILEY & SONS INC, 1998) Alkan, M; Gorur, A; Karpuz, CCAD-oriented analytic formulas are given for calculating the quasistatic parameters of the cylindrical CPW with three dielectrics. The effects of the dielectric materials on the quasistatic characteristics are investigated by using conformal mapping techniques. The calculated results are compared with those obtained for a corresponding planar CPW and a cylindrical CPW with a single dielectric. The curvature effects on the quasistatic characteristics are discussed. Moreover, the present expressions can also be extended to the cylindrical CPW with multilayer dielectrics. (C) 1998 John Wiley & Sons, Inc.Öğe Quasistatic TEM characteristics of overlayed supported asymmetric coplanar waveguides(JOHN WILEY & SONS INC, 1996) Gorur, A; Karpuz, C; Alkan, MCAD oriented analytic formulas are presented for calculating the quasistatic TEM parameters of the overlayed supported asymmetric coplanar waveguides (OSACPW). The effect of the thicknesses and the dielectric constants of the overlaying and supporting materials on the quasistatic parameters has been investigated by using the expressions derived by the conformal mapping techniques, Comparisons have also been made between this article's results and the results available in the literature for the conventional coplanar waveguide (CPW) and the asymmetric coplanar waveguide (ACPW), It has been shown that the present formulas can also be used for calculating the quasistatic TEM parameters of the line structures such as the open, the open supported, and the overlayed supported CPW or ACPW. (C) 1996 John Wiley & Sons, Inc.Öğe The neutron production cross sections for Pb, Bi, and Au targets and neutron multiplicity for nuclear spallation reaction induced by 20-to 1600-MeV protons(AMER NUCLEAR SOCIETY, 2004) Demirkol, I; Tel, E; Arasoglu, A; Ozmen, A; Sarer, B; Acir, A; Alkan, MVarious cross sections of the (p + Pb-206,Pb-207,Pb-208), (p + Pb-nat), (p + Bi-209), and (p + Au-197) reactions have been calculated at energies between 20 and 1600 MeV using the Cascade-Exciton model, Geometry-Dependent Hybrid model, and Hybrid model. The neutron multiplicity has been predicted. The calculated results have been compared with the experimental data taken from the literature. The accordance of the calculated results with the experimental data has been examined.
