Microstructure and properties have been studied for high strength steel weld metals with variations in carbon, manganese and nickel. Based on neural network modelling, experimental welds were made using shielded metal arc welding with manganese at 0.5 or 2.0 wt. % and nickel at 7 or 9 wt. %. Additional welds were made where carbon was varied between 0.03 and 0.11 wt. %. Generally there was very...

Today, due to the natural decline of oil exploitation, the use of methods of oil recovery, has made significant progress. However, these methods are accompanied by accumulation and deposition of mineral deposits in oil field installations. In the present study, aqueous solutions, strontium sulfate, barium sulfate, manganese sulfate and nickel sulfate are studied, in terms of EUNIQUAC model and ...

The effects of increasing nickel from 3 to 7 and 9 wt. % were investigated in high strength steel weld metals with 2 wt. % manganese. It was found that nickel additions were positive for strength but negative for impact toughness. Significant segregation of nickel and manganese to interdendritic regions was observed with the two higher nickel contents. In these weld metals a mainly martensitic ...

The effects of increasing the nickel content from 3 to 7 or 9 wt-% were investigated in high strength steel weld metals with 2 wt-% manganese. Nickel additions were beneficial to strength but detrimental to impact toughness. Significant segregation of nickel and manganese to interdendritic regions was observed at the two higher nickel contents. In these weld metals a mainly martensitic microstr...

Two experimental high strength steel weld metals were produced with 7 wt. % nickel and manganese at 2 or 0.5 wt. %. Neural network predictions that Mn reductions increase toughness were confirmed with impact energy increasing from 32 to 113 J at –40 °C. High resolution microstructural investigations showed that both weld metals contained mainly martensite at interdendritic regions and predomina...

The uptake and distribution of selected heavy metals were followed and related to cytotoxicity using various parameters of proliferation and viability of cultured cells. The effects of short-term lead exposure on DNA synthesis were reversible, indicating that lead does not significantly influence genetic cellular function. In contrast, nickel effects persisted, indicating that DNA is one of the...

Concentrations of manganese, considerably in excess of the quantity required for normal vegetative growth, are needed by Bacillus for (i) synthesis of such secondary metabolites and structures as antibiotics, D-glutamyl peptide, endospores, bacteriophage, and protective antigen; and (ii) longevity of vegetative cell cultures. No other biologically active element can substitute for manganese, an...

Fifty different pediatric syrups were randomly sampled from patent medicine stores and pharmaceutical shops within Awka (Anambra State, Nigeria) between November 2007 and May 2008. Syrups were ashed before digestion using conc. aqua regia, HCl: HNO(3) (3:1). Chromium, nickel and manganese were assayed with AAS 205A. The highest levels of nickel were seen in Magcid suspension (4.13 mg/L) and Gav...

A, Ahrens W et al. Biomonitoring on carcinogenic metals and oxidative DNA damage in a cross-sectional study. nickel excretion in populations living in the proximity of two Russian nickel refineries: a Norwegian-Russian population-based study. stability and reference values for urinary chromium and nickel. of cadmium, chromium, manganese, nickel and lead in whole blood, urine, axillary hair and ...