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Safety of online shopping according to customers

100%

Ingaldi M. , Brožova S.

System Safety : Human - Technical Facility - Environment

2020

tom Vol. 2, nr 1

73--81

Customers are more and more deciding to use various types of services via Internet. They make very often different types of purchases. E-commerce is becoming more and more popular and developed. Unfortunately, according to customers, online shopping is not free from problems. Customers are afraid that the ordered goods will not be sent to them, will not meet their expectations, or will be destroyed during transport. An important aspect is also the payment method for this type of shopping. Customers often prefer to pay more to use the option of payment on delivery to avoid losing money if the ordered goods do not be delivered to them. The purpose of the paper is to analyze the safety of services offered via Internet. In the research the customers of different e-shops expressed their opinion on problems that may affect the safety of the offered services. Thanks to the research, it was possible to identify risk areas in accordance with the opinion of customers.

Statistical analysis of quality parameters of pig iron

80%

Kardas E. , Pustějovská P. , Brožova S.

System Safety : Human - Technical Facility - Environment

2019

tom Vol. 1, nr 1

616--623

Steel is currently main structural material in the world. Pig iron, which is the basic product of blast furnace process, is the semi-product used in steel-making processes. It is an alloy of iron with carbon containing above 2% C and other elements with limited content, intended for further processing. Chemical composition of pig iron is its basic quality factor, it defines its class and meeting requirements set by steel plant department. It is important that this chemical composition is as stable as possible. In addition, the temperature of pig iron is also very important quality parameter. The paper presents statistical analysis of quality parameters of pig iron produced in one of Polish steelworks. The content of alloying elements and temperature of tapping of pig iron from blast furnace were examined. The amount of non-conforming production and the losses related to the low quality were assessed.

Possibilities of reducing the consumption of standardized coke in blast furnace by the use of other fuels

80%

Pustějovská P. , Kardas E. , Jursová S. , Brožova S.

Hutnik, Wiadomości Hutnicze

2020

tom Vol. 87, nr 7-8

202--204

Economics of production of pig iron is decisive for the competitiveness of the steel production. Repeated fluctuations in both inputs and outputs increasingly affect the economics, competitiveness and viability of metallurgical enterprises. The one of the ways to reduce costs is to reduce the specific consumption of coke. The paper presents the possibility of replacement the expensive metallurgical coke by other alternative fuels including coal dust, which is currently used in integrated steelworks in both the Czech Republic and Poland. Another option to reduce the cost of blast furnace coke is to replace it with a nut coke in sinter layer in the blast furnace burden. The paper presents the results of an attempt to apply this fuel in a metallurgical plant in the Czech Republic.

Ekonomika produkcji surówki wielkopiecowej jest dominującym czynnikiem konkurencyjności w produkcji stali. Powtarzające się wielokrotnie wahania strumieni wejściowych i wyjściowych w bardzo dużym stopniu wpływają na ekonomikę, konkurencyjność i rentowność przedsiębiorstw metalurgicznych. Jednym ze sposobów obniżenia kosztów produkcji jest zmniejszenie zużycia koksu wielkopiecowego. W artykule przedstawiono możliwości zastąpienia kosztownego koksu wielkopiecowego innymi paliwami zastępczymi, w tym pyłem węglowym, co jest obecnie stosowane w hutach żelaza o pełnym cyklu produkcyjnym zarówno w Republice Czeskiej, jak i w Polsce. Inną możliwością obniżenia kosztów koksu wielkopiecowego jest zastąpienie go przez koks orzech w warstwie spieku w namiarze wielkopiecowym. W artykule przedstawiono wyniki próby zastosowania tego paliwa w zakładzie metalurgicznym w Republice Czeskiej.