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Yanggu, South Korea

Tursunov M.N.,Academy of Sciences of Uzbekistan | Dyskin V.G.,Academy of Sciences of Uzbekistan | Yuldashev I.A.,Academy of Sciences of Uzbekistan | Sobirov K.,Academy of Sciences of Uzbekistan | Hwoan P.J.,Ulsan Technopark
Applied Solar Energy (English translation of Geliotekhnika) | Year: 2015

The relative change in the coefficient of efficiency is chosen as a criterion for contamination of the glass surface of a photovoltaic battery. Using the formula obtained, the results of measurements of the transmission coefficient of a contaminated glass plate after its exposure to open air in the center of Tashkent for 80 and 110 days are processed. It is shown that the contamination of the glass plate reduces the coefficient of efficiency of the PVB by 50.0%. © 2015, Allerton Press, Inc.

Tursunov M.N.,Academy of Sciences of Uzbekistan | Sabirov K.,Academy of Sciences of Uzbekistan | Hwoan P.J.,Ulsan Technopark | Turdiev B.M.,Academy of Sciences of Uzbekistan | And 2 more authors.
Applied Solar Energy (English translation of Geliotekhnika) | Year: 2013

The results of research on the development of a photovoltaic unit on the basis of a photovoltaic photo heat-recovering battery to provide a milking parlor on a cattle farm with electric energy and hot water are presented. © 2013 Allerton Press, Inc.

Ulsan Technopark and Ms Autotech Co. | Date: 2014-05-26

The invention discloses a press die for electrically assisted manufacturing performing plastic working at a relatively lower temperature than hot working by using an electroplasticity effect that a flow stress inside a material is reduced when a current is applied to the material, the press die for electrically assisted manufacturing comprising: an upper die and a lower die configured to be disposed at upper and lower portions, having the material disposed therebetween; and at least one electrode pair configured to be disposed in the upper die or the lower die, wherein the electrode pair is configured so that electrodes having different polarities in a width direction of the material face each other.

Hwang H.-T.,Ulsan Technopark | So S.-W.,Ulsan Technopark | Kim J.-D.,Korea University
Korean Journal of Materials Research | Year: 2011

Currently, there are two main issues regarding the development of core technologies in the automotive industry: the development of environmentally friendly vehicles and securing a high level of safety in the event of an accident. As part of the efforts to address these issues, research into alternative materials and new car body manufacturing and assembly technologies is necessary, and this has been carried out mainly by the automotive industries. Large press molds for producing car body parts are made of cast iron. With the increase of automobile production and various changes of design, the press forming process of car body parts has become more difficult. In the case of large press molds, high hardness and abrasive resistance are needed. To overcome these problems, we attempted to develop a combined heat treatment process consisting of local laser heat treatment followed by plasma nitriding, and evaluated the characteristics of the proposed heat treatment method. From the results of the experiments, it has been shown that the maximum surface hardness is 864 Hv by the laser heat treatment, 953 Hv by the plasma nitriding, and 1,094 Hv by the combined heat treatment. It is anticipated that the suggested combined heat treatment can be used to evaluate the durability of press mold.

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