PL
 |
EN
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 6

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Optymalizacja środowiska wiejskiego poprzez modernizację systemu odwodnienia: analiza wskaźnika zasadności inwestycji w modernizację rowów melioracyjnych na byłych terenach rolnych
Kacprzak Paweł
Inżynieria i Budownictwo
|
2024
|
R. 80, nr 4
243--246
PL
W pracy omówiono korzyści wynikające z instalacji rur, studzienek odpływowych oraz zakrycia otwartych rowów melioracyjnych na obszarach zabudowanych. Przedstawiono wskaźnik opłacalności inwestycji, uwzględniający autorskie współczynniki wagowe, który może być wykorzystany jako formalny argument uzasadniający potrzebę modernizacji istniejących rozwiązań na obszarach zabudowanych. Wskaźnik ten stanowi obiektywne narzędzie w procesie podejmowania decyzji na poziomie gminnym. Modernizacja, obejmująca instalację rur i zakrycie rowów, które wcześniej służyły celom rolniczym, prowadzi do poprawy estetyki przestrzennej w danym obszarze, a także przyczynia się do ochrony środowiska naturalnego poprzez właściwe gospodarowanie wodami na terenach, które dawniej były wykorzystywane rolniczo.
EN
The benefits of installing pipes and drainage manholes, as well as covering open drainage ditches in built-up areas, have been listed in the report. A cost-effectiveness indicator for the investment, taking into account proprietary weighting coefficients, has been presented, which can be used as a formal argument determining the need for modernization of existing solutions in built-up areas. The indicator serves as an objective tool in the decision-making process at the municipal level. Modernization involving the installation of pipes and covering ditches, which previously served agricultural purposes, leads to an improvement in spatial order in a given area and also contributes to the protection of the natural environment through proper water management in former agricultural areas.
2
Content available Assessment of cargo handling operation efficiency in the Clarion-Clipperton Zone for standard bulk carriers in the view of significant amplitudes of roll as a limiting criterion
Kacprzak Paweł
Zeszyty Naukowe Akademii Morskiej w Szczecinie
|
2023
|
nr 74 (146)
55--64
EN
Experienced ship roll during loading is the easiest parameter to observe and measure on board of a loaded ship. Therefore, the ship’s significant roll amplitudes should be the key limiting factor in view of the safety and efficiency of cargo handling operations at sea. For the example of three standard bulk carriers, the authors prepared a method of assessment of bulk carrier suitability to perform safe and efficient cargo handling operations in the Clarion-Clipperton Zone in view of significant amplitudes of roll. Via a calculation of the efficiency index for a set of limiting amplitudes of roll during loading simulation, we are able to analyze ship effectiveness. The application of the above-mentioned method can be employed as a useful tool to predict the lowest allowable significant amplitudes of roll when the required efficiency level is specified. Additionally, a calculation is made for the operable days where cargo operations are possible. Investigations show that, according to applied criteria, the effectiveness drops, and not every bulk carrier can perform safe cargo handling operations at sea.
3
Content available Application of 2nd generation stability code for 7600DWT bulk carrier with high value of GM, being in dead ship condition in irregular waves
Kacprzak Paweł
Zeszyty Naukowe Akademii Morskiej w Szczecinie
|
2023
|
nr 75 (147)
14--19
EN
The main issue of this article is to apply and investigate the application of second stability criteria for bulk carriers in typical loading conditions sailing in irregular waves. The author, by the use of linear strip theory, calculates the significant amplitudes of the ship roll with respect to wave height, incident wave angles, and mean sea period. A basic stability analysis, in this case, could be insufficient when considering other related factors like cargo shift, taking up water on the weather deck, wind gusts, inaccuracy of transverse metacentric height, and the case of changing transverse metacentric height in long-crested waves. This article shows that, in some waving conditions, the weather criteria based on standard assumptions of the ISC 2008 may be insufficient. The application of the author’s method of safety margin may increase vessel safety in view of weather criteria.
4
Content available An analysis of shear forces, bending moments and roll motion during a nodule loading simulation for a ship at sea in the Clarion–Clipperton Zone
Kacprzak Paweł
Zeszyty Naukowe Akademii Morskiej w Szczecinie
|
2021
|
nr 65 (137)
9--20
EN
This article presents an analysis of internal forces and roll motion during a nodule loading simulation for a ship at sea. The study carried out a full assessment of ship behavior during loading, which took into account wave height and period occurrence around the Clarion–Clipperton Zone by the use of an operational efficiency index. One of the aims was to verify whether waves have an influence on excessive ship motion and internal forces during nodule loading. Two alternative loading sequences were developed and compared by taking loading time, shear forces, bending moments, roll motion and waving into account. The research shows that loading is only possible during specific sea weather conditions for the selected bulk carrier.
5
Content available Presentation of the ship squat effect as a function
Zwolan Piotr, Kacprzak Paweł
Annual of Navigation
|
2021
|
No. 27
28--38
EN
In this article the authors propose a change in approach when providing information included in maneuvering documents on the squat effect of a ship. The development of ships which is aimed at increasing the loading capacity contributes to the increase of their draft and construction dimensions. This fact renders it necessary to develop ports and to interfere in the bathymetric layer of the basin, i.e. its deepening. However, the under keel clearance along the ship’s route and during the port towing maneuvers is often significantly limited. This makes it crucial to adapt the speed to the sailing conditions. Knowledge of the draft change with a low water level under the keel is important for the safety of navigation. Hence, the authors proposed expanding the maneuvering information contained in the ship's documentation with the additional curve of squat effect presented in the form of polynomial functions.
6
Content available An analysis of vertical shear forces and bending moments during nodule loading for a standard bulk carrier in the Clarion-Clipperton Zone
Cepowski Tomasz, Kacprzak Paweł
Zeszyty Naukowe Akademii Morskiej w Szczecinie
|
2019
|
nr 60 (132)
184--191
EN
This article presents an analysis of vertical shear forces and bending moments during nodule loading in the case of a standard bulk carrier around the Clarion–Clipperton Zone. An operational efficiency index was applied to an assessment of internal forces during loading which took into account wave heights and periods around this zone. The aim of this research was to investigate whether waves could have a negative effect on loading efficiency and to estimate the nodule mass that can safely be loaded onto a standard bulk carrier taking these waves into account. Moreover, a calculation was made to discover the acceptable vertical shear force percentage limit, while also taking into account wave activity during loading.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.