Magistro darbe nagrinėjamos AB „Mažeikių nafta“ naftos produktų transportavimo geležinkeliu galimybes, išskiriami logistikos teorijos ypatumai ir jos įtaka įmonės veiklai, išanalizuoti vidiniai ir išoriniai veiksniai, veikiantys naftos produktų transportavimo geležinkeliu, išsamiai atlikta naftos produktų transportavimo geležinkelio transportu analizė, kurios pagalba atskleistos naftos produktų transportavimo geležinkeliu stipriosios ir silpnosios pusės bei efektyvios veiklos galimybės. Patvirtinama autorių suformuluota mokslinio tyrimo hipotezė, kad AB „Mažeikių nafta“ naftos produktų logistikos sistema geležinkeliu, su sąlyga, kad apimtys 2007-2009 metais �������� vietines rinkas padidės, yra optimali ir lengvai prisitaiko prie išorinių ir vidinių veiksnių pokyčių bei galės užtikrinti naftos produktų transportavimą geležinkeliu. / This Master Paper analyzes the opportunities of AB Mazeikiu Nafta related to petroleum products railway transportation, highlights characteristics of logistics theory and impact of logistics on the Company’s business activities, analyzes internal and external factors influencing transportation of petroleum products by railway. The Paper also contains comprehensive analysis of petroleum products transportation by railway, which analysis helps determining the strengths and weaknesses of petroleum products railway transportation and efficient operations opportunities. The analysis and, consequently, the Paper reinforces the hypothesis of scientific research stating that the railway logistics system of AB Mazeikiu Nafta utilized for transportation of petroleum products, assuming increase of the volumes to the local markets in 2007-2009, is an optimum system adaptable to any changes of external and internal factors and will be able to ensure transportation of petroleum products by railway in the future.

Railway track ballast fouling is an ongoing issue without a clear understanding regarding either the cause for generation or the source of the fouling materials. This study was conducted to determine what physical processes are likely causing ballast fouling, where in the track sub-structure fouling material is concentrating, and what factors affect the severity of ballast fouling. A field investigation on a CN railway track was conducted in Joliette, QC during undercutting maintenance operations. Data for in-situ ballast, sub-ballast, and subgrade samples were gathered from a series of trenches excavated through the track embankment. The geotechnical and mineralogical characteristics of a selected set of ballast samples were gathered through a regime of laboratory testing. Grain size distribution data for the select samples was collected from sieve and hydrometer testing. Three sets of LA abrasion tests were conducted on both in-situ and freshly quarried ballast rock to determine the degradation characteristics of the various ballast types. The petrographic analysis of the sample types was conducted using bulk hand sample characterization, thin-section analysis, and X-Ray Diffraction Analysis. The petrographic, grain size, and LA abrasion combined analysis indicated that ballast fouling was primarily caused through degradation of the ballast. The fouling material within the ballast pores was sourced to the abraded pieces of ballast that had degraded over time through XRD and grain size distribution analysis. It was found with statistical confidence that ballast layers with harder, structureless rock types have less fouling material form within the ballast void spaces compared to ballast rock types that are soft on the Mohs hardness scale or have planes of weakness due to structural factors. Analysis of the grain size data also showed that ballast fouling was generally concentrated within the section of the ballast layer directly underlying the steel rail, within the topmost parts of the ballast layers. Overall it was recommended that the effects of chemical degradation on ballast rock types and the historical operational duration of ballast be incorporated into future ballast fouling studies. / Thesis (Master, Geological Sciences & Geological Engineering) -- Queen's University, 2011-09-27 10:01:46.141

Darbe nagrinėjama geležinkelio triukšmo problema, išanalizuotas triukšmo poveikis žmonių sveikatai. Pateikta geležinkelio infrastruktūros, riedmenų modernizavimo galimybės. Apibendrinti geležinkelio tinklo plėtros planai, geležinkelio svarba Lietuvos ūkio plėtrai. Išanalizuoti Europos Sąjungos bei Lietuvos Respublikos triukšmo mažinimo politikos pagrindiniai aspektai.Remiantis tyrimų duomenimis parengtos techninės, urbanistinės, ekonominės, organizacinės, teisinės, ekologinio švietimo geležinkelio triukšmo mažinimo priemonės Šiaulių mieste. / Thesis examines the problem of railway noise, analyzes the effects of high noise levels to human health. Ii also discusses the possibilities of modernising railway mechanics and infrastructure. The possibilieties of expansion of railway system and it‘s necessity to Lithuanian economy is sumarized. The main aspects of noise reduction politics in Lithuania and European Union are given.By analyzing the research data, the railway noise reduction plan of Šiauliai city , in technical, urban, economical, organizational, juridical and ecological aspects, was prepared.

The research presented in this thesis is aimed at developing a limit state design methodology for railway track for recommendation to Standards Australia's next revision of the 'Permanent way materials: prestressed concrete sleepers' code (AS1085.14, 2003). There is widespread suspicion that the railway track, particularly concrete sleepers, have untapped reserves of strength that has potential engineering and economic advantages for track owners. Through quantifying the effects of train speed, wheel impact loadings and distribution of vehicle loads, track engineers would be able to design railway track more accurately and hence uncover the reserves of strengths in railway track. To achieve this improvement a comprehensive set of wheel/rail impact measurements has been collected over a one year period to establish a distribution of track loadings. The wheel/rail impact data collected showed a logarithmically linear distribution which shows that impact forces are randomly occurring events. The linearity of the data also allows for wheel/rail impact forces to be forecasted allowing for a more rational risk based design of the railway track. To help with an investigation of the influence of changes to train operation on the wheel/rail impact force distributions, development of a new dynamic track computer model capable of simulating the complex interaction between the train and track was completed within this research. The model known as DTRACK (Dynamic analysis of rail TRACK) was benchmarked against other dynamic models and field data to validate its outputs. The field measurements and DTRACK simulations became the basis for development of a limit state design methodology for railway track (risk based approach) for railway track in place of an allowable limit state (compliance based) approach. This new approach will allow track owners to assess the track capacity based on more realistic loads and is expected to allow an increase in the capacity of existing track infrastructure which will allow railways to be more commercially competitive and viable.

Thesis (M.B.A.)--University of Hong Kong, 1998. / Includes bibliographical references (leaf 70).

Thesis (M. Sc.)--University of Hong Kong, 1997. / Includes bibliographical references.

Thesis (M.A.)--University of Hong Kong, 1994. / Includes bibliographical references.

Thesis (M.A.)--University of Hong Kong, 1999. / Includes bibliographical references (leaves 88-91).

Thesis (M.B.A.)--University of Hong Kong, 1998. / Includes bibliographical references (leaf 70) Also available in print.

Thesis (Ph. D.)--Carleton University, 1984. / Also available in electronic format on the Internet.