scholarly journals Study on vapor shielded pressure bonding process of non-ferrous metals by resistance heating and its inprocess quality control. (Report 3). Bonding quality of contact-bar and quality improvement by vapor shield process.

1987 ◽  
Vol 5 (4) ◽  
pp. 458-464
Author(s):  
Kazumichi Machida ◽  
Takio Okuda ◽  
Syuji Nakata
Keyword(s):  
Quality Control ◽  
Quality Improvement ◽  
Bonding Process ◽  
Resistance Heating ◽  
Bonding Quality ◽  
Ferrous Metals ◽  
Non Ferrous Metals ◽  
Quality Of Contact

Study on Internal Quality of Billets for 20CrMnTiH Steel

2014 ◽  
Vol 941-944 ◽  
pp. 132-137
Author(s):  
Hong Guang Li ◽  
Tian Ming Chen ◽  
Liang Chen ◽  
Jia Qi Wang ◽  
Wen Zhong Yang
Keyword(s):  
Quality Control ◽  
Quality Improvement ◽  
Casting Speed ◽  
Cooling System ◽  
Current Intensity ◽  
Internal Quality Control ◽  
Internal Quality ◽  
Secondary Cooling ◽  
Carbon Segregation

According to the requirement of 20CrMnTiH steel, the effects of casting peed, EMS current intensity and secondary cooling system on internal quality of billets are studied. The results show that, it is beneficial to internal quality control of 20CrMnTiH billets when the casting speed is in the range of 1.2~1.4m/min, and when the current intensity of EMS is 380A, the level of center porosity can be controlled in 1.0, the index of carbon segregation can be controlled in 1.08 and equiax crystal ratio reaches 34.9%. Furthermore, it is beneficial to internal quality improvement when weak secondary cooling system is adopted. With the application of the studies, the quality of billet macrostructure and hardenability can meet the requirement of 20CrMnTiH steel.

Optimized product quality control at Kola MMC’s mineral processing plant

2020 ◽  
pp. 88-93
Author(s):  
A. N. Glazatov ◽  
◽  
M. S. Molodtsev ◽  
A. M. Kazakov ◽  
L. A. Brazyulis ◽  
...  
Keyword(s):  
Quality Control ◽  
Product Quality ◽  
Mineral Processing ◽  
Processing Plant ◽  
Product Quality Control ◽  
Intermediate Precision ◽  
Ferrous Metals ◽  
Technical Control ◽  
Non Ferrous Metals ◽  
Preparation Equipment

Kola MMC’s Mineral Processing Plant has optimized its product quality control system designed to monitor the mass concentration of non-ferrous metals in the commercial products: i.e. the finished concentrate and the final tailings. Thus, automatic samplers and dividers of Sections 1, 2 and 3 have been made fully conforming with GOST 14180–80; through experiments, variation coefficients have been determined, which were used to specify the homogeneity class for the concentrate and the tailings; operating parameters have been defined for the sampling and sample preparation equipment; through experiments, intermediate precision mean square deviations (Sопр) and intermediate precision limits (RLопр) have been determined. Measurement procedures have been developed that were certified by Rosstandart, Russia’s Federal Agency for Technical Control and Metrology.

scholarly journals An empirical study of entrepreneurship education and teaching in Colleges and Universities under the concept of sustainable development

2021 ◽  
Vol 251 ◽  
pp. 02084
Author(s):  
He Jiang ◽  
Yonghui Cao
Keyword(s):  
Sustainable Development ◽  
Quality Control ◽  
Quality Improvement ◽  
Empirical Study ◽  
Quality Function Deployment ◽  
Implementation Process ◽  
Entrepreneurship Education ◽  
Teaching Quality ◽  
Quality Design

This paper applies the quality function deployment (QFD) theory to improve the teaching quality of entrepreneurship education, and puts forward the QFD model of entrepreneurship education teaching quality improvement. First of all, the paper constructs a series of quality houses by mining the customers’ demand for entrepreneurship education, including the quality house of teaching quality design, the quality house of teaching quality implementation and the quality house of teaching quality control. The entrepreneurship education customer demands are expanded to the specific steps of teaching process, and the establishment of entrepreneurship education teaching target and a series of implementation process, to improve the teaching quality of entrepreneurship education in local universities through the realization of these goals.

scholarly journals Modern electrochemical processes and technologies in ionic melts

2003 ◽  
Vol 39 (1-2) ◽  
pp. 93-107 ◽  
Author(s):  
A. Omelchuk ◽  
S.V. Volkov ◽  
O.G. Zarubitskii
Keyword(s):  
Ferrous Metal ◽  
Metal Alloys ◽  
High Quality ◽  
Bipolar Electrodes ◽  
Electrochemical Processes ◽  
Ionic Melts ◽  
Ferrous Metals ◽  
Non Ferrous Metals ◽  
Metallic Impurities

An analysis of the known methods for the electrochemical purification of non-ferrous metals in ionic melts is presented. A comparative estimation of the results of the electrochemical purification of non-ferrous metals by different methods has been performed. The main regularities of the electrochemical behavior of non-ferrous metals in conventional and electrode micro-spacing electrolysis are presented. It has been found that when electrolyzing some metals, e. g. bismuth, gallium, there is either no mass exchange between the electrodes, or it occurs under filtration conditions. It has been shown that the electrode micro-spacing processes provide a high quality of non-ferrous metals purification at low specific consumption of electric power and reagents. The use of bipolar electrodes and ?-alumina diaphragms hinders the transfer of metallic impurities from the anode to the cathode. The effects revealed were used to develop new processes for the separation of non-ferrous metal alloys in ionic melts; most of them have been put into practice in non-ferrous metallurgy.

scholarly journals Touchstones from Early Medieval chamber graves in Ciepłe, Eastern Pomerania

2021 ◽  
Vol 73 (2) ◽  
Author(s):  
Sławomir Wadyl ◽  
Jakub Karczewski
Keyword(s):  
Precious Metals ◽  
The Other ◽  
Reliable Indicator ◽  
Social Standing ◽  
Medieval Period ◽  
Early Medieval ◽  
Early Medieval Period ◽  
Ferrous Metals ◽  
Non Ferrous Metals

The precious metals of the early medieval period were the same as those of today. Knowing their purity was essential, which means that assaying and refining were of great importance. Touchstones have been used to assess the quality of precious metals since antiquity. Stone artefacts initially identified as whetstones were unearthed in two of the most prestigious chamber graves discovered at the cemetery in Ciepłe. Traces of precious and non-ferrous metals on the surface of the object from Grave 42 proved that this artefact was a touchstone. It is probable that the phyllite stone from the other grave served the same purpose. Tools of this type are often found in high-prestige burials in Europe, in some cases together with balance scales and weights, which suggests that the individuals in whose graves they were deposited had access to precious metals. Therefore interpreting touchstones as a reliable indicator of the high social standing of the deceased seems entirely reasonable.

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