topological indices are numerical parameters of a graph which characterize its topology. inthis paper the pi, szeged and zagreb group indices of the tetrameric 1,3–adamantane arecomputed.

in theoretical chemistry, molecular structure descriptors are used to compute properties of chemical compounds. among them wiener, szeged and detour indices play significant roles in anticipating chemical phenomena. in the present paper, we study these topological indices with respect to their difference number.

TMCP (thermo-mechanical controlled process) linepipes have long been used in severe sour environments, but recently sulfide stress cracking (SSC) caused by local hard zones has become a concern. In order to clarify the hardness threshold that leads SSC, four-point bend (4PB) SSC tests as specified NACE TM0316 were conducted under several H2S partial pressure conditions. At pressures of 1 bar an...

IFMIF-DONES, or the InternationalFusionMaterialsIrradiationFacility-DEMOOrientedNeutronSource, is a facility for investigations into foreseen fusion power plant materials using relevant neutron irradiation of 14 MeV. This special n-irradiation generated by interaction deuteron beams with liquid lithium. A critical issue during operation IFMIF-DONES enrichment dissolved impurities in Li-melt loo...

The corrosion behavior of carbon steel X36 (CSX36) in solutions soils collected from different areas linked to the main pipe network a water distribution system Jeddah City (Obhour Al Shamaliyah, Ob-Sh; Shateie, Sh; Safa, Sf; Samer, Sa; and Jameaah, Ja) at an ambient temperature (23 ± 1 °C) was studied. monitored using various techniques, such as weight loss electrochemical (open circuit potent...

The article presents important problems occurring in the operation of large-size steel structures protected by paint coatings. In our atmospheric conditions, corrosion cannot be avoided, even with use protective problem environmental pollution products and exfoliated then appears. When designing protection, durability protection is assumed based on corrosivity categories, but practice degradati...