Zobrazeno 1 - 10
of 195
pro vyhledávání: '"Kozak Janusz"'
Publikováno v:
Polish Maritime Research, Vol 31, Iss 3, Pp 135-141 (2024)
This article analyses the effects of deformation on the structure of CMnSi steel at various deformation levels. After hot forging, the structure of CMnSi steel comprises coarse-sized alpha and pearlite particles. The average grain size of steel after
Externí odkaz:
https://doaj.org/article/5704839e852749e1b46e0693a3807995
Publikováno v:
Polish Maritime Research, Vol 30, Iss 3, Pp 191-211 (2023)
The global supply chain has been growing strongly in recent years. This development brings many benefits to the economy, society, and human resources in each country but also causes a large number of concerns related to the environment since traditio
Externí odkaz:
https://doaj.org/article/9d03063c2b02462c8e7d419cf381bdf9
Autor:
Nguyen Van Giao, Rajamohan Sakthivel, Rudzki Krzysztof, Kozak Janusz, Sharma Prabhakar, Pham Nguyen Dang Khoa, Nguyen Phuoc Quy Phong, Xuan Phuong Nguyen
Publikováno v:
Polish Maritime Research, Vol 30, Iss 2, Pp 39-60 (2023)
In marine vessel operations, fuel costs are major operating costs which affect the overall profitability of the maritime transport industry. The effective enhancement of using ship fuel will increase ship operation efficiency. Since ship fuel consump
Externí odkaz:
https://doaj.org/article/a78fe64705ad4e4ab88246d87899cb47
Autor:
Karczewski Artur, Kozak Janusz
Publikováno v:
Polish Maritime Research, Vol 30, Iss 1, Pp 4-12 (2023)
In the field of ocean engineering, the task of spatial hull modelling is one of the most complicated problems in ship design. This study presents a procedure applied as a generative approach to the design problems for the hull geometry of small vesse
Externí odkaz:
https://doaj.org/article/bbd2643bc28743a1aeb482ccd3d86c37
Autor:
Kowalski Jakub, Kozak Janusz
Publikováno v:
Polish Maritime Research, Vol 29, Iss 3, Pp 160-166 (2022)
In the shipbuilding industry, the risk of brittle fractures is relatively high because some units operate in arctic or subarctic zones and use high thickness (up to 100 mm) steel plates in their structures. This risk is limited by employing certified
Externí odkaz:
https://doaj.org/article/5120e749768b40dfa749f1db48786502
Autor:
Kozak Janusz
Publikováno v:
Polish Maritime Research, Vol 29, Iss 1, Pp 97-107 (2022)
The welding process is the basic technique of joining in the shipbuilding industry. This method generates welding distortions that cause a lot of problems during the manufacturing process due to both the time and cost of straightening as well as thei
Externí odkaz:
https://doaj.org/article/0a137028cbc44b67a2bc7bcdfb104d16
Autor:
Kozak Janusz
Publikováno v:
Polish Maritime Research, Vol 28, Iss 2, Pp 128-135 (2021)
Steel sandwich structures are perceived as alternatives to single-skin welded structures in the shipbuilding industry due its advantages like significant reduction of mass in relation to typical single skin structure. However, beside problems with th
Externí odkaz:
https://doaj.org/article/851924cf650e4289b81f9f5f0eb9af7b
Autor:
Kowalski Jakub, Kozak Janusz
Publikováno v:
Polish Maritime Research, Vol 25, Iss 2, Pp 85-91 (2018)
In elements of steel structures working at low temperatures, there is a risk of appearance of brittle fracture. This risk is reduced through the use of certified materials having guaranteed strength at a given temperature. A method which is most freq
Externí odkaz:
https://doaj.org/article/20c6d09bb1f24eea90880e67142d122f
Autor:
Kowalski Jakub, Kozak Janusz
Publikováno v:
Polish Maritime Research, Vol 25, Iss 2, Pp 78-84 (2018)
In the shipbuilding industry, the risk of brittle fracture of the structure is limited by using certified materials with specified impact strength, determined by the Charpy method (for a given design temperature) and by supervising the welding proces
Externí odkaz:
https://doaj.org/article/7eaa0bf747cd4e1992d55c429b860b24
Autor:
Karczewski Artur, Kozak Janusz
Publikováno v:
Polish Maritime Research, Vol 25, Iss s1, Pp 63-67 (2018)
In the paper selected approximate methods for calculation of inland waterways ship resistance and their verification by towing tests, compared on the example of a small urban ferry, are presented. The test results are made for both the bare hull and
Externí odkaz:
https://doaj.org/article/2283d0f8a06f428e93321ecb84997a09