May 20, 2020Open AccessArticle
In this paper, we have discussed the coloration mechanism based on visible absorption spectra testing by selecting three typical samples of Luodian jade with white, pallor and cyan. The attribution analysis of absorption spectra showed that absorption of Luodian jade in visible light mainly includes charge transfer spectrum of Fe2 → Ti4 (at 490 nm - 500 nm) and Fe2 → Fe3 (at 523 nm - 536 nm, 646 nm - 657 nm), electron transition 6A1 → 4T2 (4G) of Fe3 (at 615 nm - 632 nm, 685 nm - 694 nm) an...
Apr 23, 2020Open AccessArticle
Toxicity of zinc, cadmium and phenol and their binary mixtures were determined based on inhibition of dehydrogenase activities of yeasts strains isolated from hydrocarbon impacted soil. The yeasts isolated from the hydrocarbon impacted soil were identified as Saprochaete sp. and Cryptococcus sp. The toxicity of chemicals and their mixtures were evaluated in the concentration range of 0 - 16 mM for phenol, 0 - 5 mM for zinc and 0 - 0.4 mM for cadmium. The binary mixture ratios were evaluated. The...
May 29, 2019Open AccessArticle
Geometry configurations of joining partners (similar/dissimilar metals) are important to achieve effective and smooth joint in electromagnetic (EM) compression welding. Accordingly, design of welding tool (multi-turn coil) becomes challenging . EM welding of flared D9 flyer tube to SS316 L (N) straight cylindrical plug has been performed under a discharge voltage of 15 - 17 kV with coil current 230 - 250 kA at
May 28, 2018Open AccessArticle
This article gives a brief review of scientific researches of high-alloyed chromium-nickel steels stress corrosion cracking (SCC) process of welded joints. Welded joints are one of the most complex objects from the standpoint of the general theory of corrosion fatigue of metals. During their operation a number of problems arise related to the heterogeneity of the material properties, the complexity of the structure, the presence o
Feb 22, 2017Open AccessArticle
Forming processes are generally characterized by a high degree of material utilization as well as short process times and, consequently, a decent economic efficiency. Furthermore, incremental forming enables the use of relatively low forming forces which results in a more compact design of the used machines. These conveniences are utilized in terms of roll forming with round tools to form gears and thread
Apr 18, 2016Open AccessArticle
This paper focuses on the duplex stainless steel processability and
presents many practical technological approaches which are applied in many steel
companies on how to improve the processability. First, take into consideration an
appropriate hot working temperature; second, make sure cooling rate higher than
15℃/s; and third, conduct annealing treatment before delivery.
Feb 28, 2015Open AccessArticle
Hydrometallurgical recycling of lead from zinc plant residue which occurs
at leaching plant has been investigated. After determination of optimum
parameters in the brine leaching stage, the pregnant solution was proposed on
cementation process by Aluminum powder and parameters (time, temperature,
initial pH of solution, initial lead content of solution, Al:Pb fraction,
stirring velocity) were investigated and optimized.
Nov 21, 2014Open AccessArticle
study was devoted to the investigation of the influence of the carbon reducer’s
surface on the rate of the copper removal (in the form of a copper-reach alloy,
Cu-Pb-Fe) from the slag produced in the flash direct-to-blister process at the
Glogów smelter in Poland. The
slag used in this work was taken from the direct-to-blister Outokumpu flash
furnace at the smelter in Glogów. Graphite penetrators of different surfaces
were used as the slag reducer, and the experiments were carried out at 157...
Nov 05, 2014Open AccessArticle
The article reflects the results of the study of the
process of hardening of steels radiation fiber laser and the increase of
productivity of process of laser hardening due to implementation of fiberoptic
lasers instead of CO2 and the increase of the coefficient of
absorption of laser radiation and the exclusion of the necessity to use absorbing
coating. The research studied the structure of the hardened layer, compared
with the structure of the obtained on CO2 laser, and p...
Jun 20, 2014Open AccessArticle
Qingshan Thermoelectric Plant located in Wuhan City,
Hubei Province, China, and it uses coal as a fuel. Coal combustion generates
not only gaseous pollutants like SO2 and NOx but also toxic and heavy metals to
the atmosphere. From the environmental point of view, the determination and
speciation of trace toxic and heavy metals released from coal combustion are
very important. In this work, the atomic spectroscopic methods for
determination of so