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Hulthén Half-off-Shell T Matrix-Application to n-p and n-d Systems
A. K. Behera,U. Laha,P. Sahoo,J. Bhoi 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.9
In a previous paper, one of us (UL) constructed an exact analytical expression for the irregular (Jost) solution, off the energy shell, for the Hulthén potential by using the method of ordinary differential equation along with the properties of certain special functions of mathematical physics. In the present text, closed form expressions for the off-shell irregular solution and half-off-shell T-matrix for motion in the Hulthén potential are re-derived by using the direct integration approach to the problem under consideration. We demonstrate the usefulness of our expressions through some model calculations and achieve excellent agreement between bound-and scattering-state observables and standard results.
Creep Properties of Intercritical Heat Treated Boron Added Modified 9Cr–1Mo Steel
T. Sakthivel,C. R. Das,K. Laha,G. Sasikala 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.2
Creep properties of intercritically heat-treated (ICHT) boron free modified 9Cr–1Mo steel (P91-IC) and boron containingmodified 9Cr–1Mo (P91B-IC) steel have been studied at 923 K over a stress range of 50–120 MPa. Minimum creep rate ofthe P91B-IC steel was significantly lower than the P91-IC steel. Stress exponent and threshold stress values in P91-IC andP91B-IC steels were found to be 6.5 and 28 MPa, and 8.7 and 38 MPa respectively. P91B-IC steel has exhibited higher creeprupture life than the P91-IC steel. Higher creep rupture strength in the P91B-IC steel as compared to P91-IC steel has beenattributed to the presence of stable M23C6precipitates at the lath boundaries and other high angle boundaries. The creeprupture strengths of both the ICHT steels were lower than the respective base metal.