Zirconium alloy powders for manufacture of 3D printed articles used in nuclear power industry

Main methods of zirconium alloy powder synthesis have been reviewed. Powder applications for additive manufacturing were analyzed. Advantages and drawbacks of zirconium powder production and usage have been shown. Hydrogenation/dehydrogenation method was offered for zirconium powder production.Розглянуто основні способи отримання порошків цирконієвих сплавів. Проаналізовано застосування порошків в адитивних виробництвах. Показано переваги та недоліки способів отримання і застосування порошків цирконію. Для виробництва порошків цирконію запропоновано метод гідрування/дегідрування.Рассмотрены основные способы получения порошков циркониевых сплавов. Проанализированы применения порошков в аддитивных производствах. Показаны преимущества и недостатки способов получения и применения порошков циркония. Для производства порошков циркония предложен метод гидрирования/дегидрирования

Instanton-induced contributions of fractional twist to the cross section of hard gluon-gluon scattering in QCD

We study the instanton-induced cross section of hard gluon scattering in deep-inelastic kinematics. We find that the structure functions may possess numerically large nonperturbative contributions, which are related to Ringwald-type processes with the violation of chirality, and correspond to the exponential correction to the coefficient function in front of the parton distribution of the leading twist. Instanton-induced contributions are well defined for the structure function at the fixed value of the Bjorken scaling variable, and are probably absent in the moments. At intermediate virtualities of the order of Q2∼(30-50 GeV)2 these essentially nonperturbative contributions of fractional twist reach large values, of order 100-10-2 of the perturbative cross section, and remain at the same time under theoretical control