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Y. G. Bala,S. Raman Sankaranarayanan,K. S. Pandey 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.6
The present investigation was carried out to evaluate the densification, mechanical properties, microstructural and fractrography effects of AISI 8630 steel composition developed through powder preform forging under different heat treated conditions. Sintered preforms of different aspect ratios such as 0.6, 0.9, and 1.2 were hot upset forged to disc shape to different height strain to analysis the densification mechanism. Certain relationships relating strains, Poisson’s ratio relating densification have revealed the effect of preform geometry on densification kinetics and resulted in the polynomial expression with justified regression coefficient greater the 0.9 or unity. The preforms of aspect ratio of 1.1 were hot upset forged to square cross section bars and transferred to different quenching medium like oil, water, furnace and air to assess its mechanical properties. Comparing the temperament of the heat treatments, sintered forged homogenised water quenched sample upshot in the maximum Tensile strength with least per centage elongation andthe furnace cooled sample shows the maximum toughness with desirable per centage elongation and least tensile strength. Microstructure stated the presence of varying ferrite and pearlite distribution and fractograph studies has disclosed the mixed mode of failure on the effect of varying heat treatments progression has affected the properties significantly.
Search for doubly charmed baryons and study of charmed strange baryons at Belle
Kato, Y.,Iijima, T.,Adachi, I.,Aihara, H.,Asner, D. M.,Aushev, T.,Bakich, A. M.,Bala, A.,Ban, Y.,Bhardwaj, V.,Bhuyan, B.,Bobrov, A.,Bonvicini, G.,Bozek, A.,Brač,ko, M.,Browder, T. E.,Č,erven American Physical Society 2014 PHYSICAL REVIEW D - Vol.89 No.5
Chobanova, V.,Dalseno, J.,Kiesling, C.,Adachi, I.,Aihara, H.,Asner, D. M.,Aulchenko, V.,Aushev, T.,Aziz, T.,Bakich, A. M.,Bala, A.,Ban, Y.,Belous, K.,Bhuyan, B.,Bobrov, A.,Bonvicini, G.,Bozek, A.,Bra& American Physical Society 2014 PHYSICAL REVIEW D - Vol.90 No.1
<P>We present a measurement of the branching fractions and charge- parity-( CP-) violating parameters in B..K decays. The results are obtained from the final data sample containing 772 x 10(6) BB _ pairs collected at the.d4S_ resonance with the Belle detector at the KEKB asymmetric- energy e_e- collider. We obtain the branching fractions BdB0 0 _d4.5 0.4dstat_ 0.3dsyst_x10- 6; BdB_..K__ d6.80.4dstat_ 0.4dsyst__x10- 6 which are in agreement with their respective current world averages. For the CP- violating parameters, we obtain A.K0 S - 0.36 +/- 0.19dstat_ 0.05dsyst_; S.K0 S _0.91 0.32dstat_ 0.05dsyst_; A.K_ - 0.03 +/- 0.04dstat_ 0.01dsyst_; where A and S represent the direct and mixing- induced CP asymmetry, respectively. We find no evidence of CP violation in the decay channel B_..K_; however, we obtain the first evidence of CP violation in the B0..K0 S decay channel at the level of 3.1 standard deviations.</P>