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Wyświetlanie 1-15 z 248
Tytuł:
Propulsion and maneuvering systems’ characteristics of the U.S. flagged great lakes self-unloading bulk carriers
Autorzy:
Przybylski, M.
Powiązania:
https://bibliotekanauki.pl/articles/2073547.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
vessel propulsion
vessel maneuvering
bulk carrier
Great Lakes bulk carrier
self-unloader
Opis:
Paper contains an overview of the propulsion and maneuvering systems’ characteristics of United States flagged Great Lakes self - unloading bulk carriers. A contrast between the importance of the transport task carried by those vessels to their low number and considerable age suggests the need to review and understand their complexity as well as complexity of their operations in order to provide suitable energy- and operational efficiency upgrades. Such review can prove to be challenging due to limited information available in the literature. Environment in which those vessels operate and their operational profile have been also reviewed due to the fact that they gave rise to the unique hull - form that subsequently influenced the propulsion and maneuvering system design in a significant manner. The environment and operational profile were also found to influence propulsion and maneuvering systems’ form more directly: through the requirements posed on vessels maneuvering capabilities and propulsive power requirements.
Źródło:
Journal of Polish CIMEEAC; 2018, 13, 1; 78--88
1231-3998
Pojawia się w:
Journal of Polish CIMEEAC
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Handling and transportation properties of rapeseed biomass as affected by particle size
Autorzy:
Bojanowska, Milena
Powiązania:
https://bibliotekanauki.pl/articles/29521042.pdf
Data publikacji:
2023
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
rapeseed meal
rapeseed cake
canola
biomass
agricultural commodities
bulk storage
flowability
logistics vulnerability
particle size
angle of repose
porosity
bulk density
agricultural bulk solids
Opis:
Rapeseed by-products of seeds de-oiling, particularly expellers and post-extracted meal, are currently considered an important biomass that can be used as an alternative energy source, either in raw form or after conversion to biochar. Rapeseed biomass represents a difficult-to-handle cargo, mainly due to its sensitivity to mechanical, climatic, and biological impacts, as well as its dusty nature. This study aims to determine the physical properties of rapeseed meals and their fractions. Morphological and chemical features of six particle sets are investigated in order to explain the variation in their physical properties having importance in handling and transportation processes. The true density of fractions increases when the particle size decreases due to the diminishing quantitative share of seed coats. No correlation is observed between true and bulk densities, as the particle shape, surface sculpture, and adhesion affect the mutual particle arrangements. Along with a decrease in the particle size from 0.4 mm, a rapid decrease in the flowability is observed. The tendency of the finest dust (d < 0.075 mm) to form agglomerated complexes causes its lower bulk density, higher porosity, and higher angles of repose in comparison to coarse dust (0.075–0.4 mm). It is concluded that a relatively low tendency to free flowing of natural RSM is mainly caused by its wide-ranging particle size distribution and their geometry differentiation, which facilitate mutual particle interlockings. The known cases of blockages of silos, bins, hoppers, and transfer chutes may be mainly caused by the powder fractions (< 0.2 mm), with a much lower flowability than other particles.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2023, 74 (146); 5-15
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Opredelenija neravnomernosti dozirovanija sypuchikh materialov s pomoshhju avtomatizirovannogo ustrojjstva
Definitions of non-uniform feeding of bulk materials by means of automated devices
Autorzy:
Bojjko, I.
Rusaljov, A.
Sementsov, V.
Powiązania:
https://bibliotekanauki.pl/articles/77454.pdf
Data publikacji:
2013
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
automatic device
determination
feeding
bulk material
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 7
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of static pressure of seeds in a shallow model silo
Autorzy:
Horabik, Józef
Molenda, Marek
Powiązania:
https://bibliotekanauki.pl/articles/972716.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
bulk of seeds
silo
pressure
friction
Opis:
The influence of the filling method, the seed size and the aspect ratio on the radial distribution of the vertical pressure on the floor of a shallow model silo and radial distribution of tangent stress within the material was investigated. Three filling methods were applied: central, circumferential and distributed. Seeds of five varieties were used: horse bean, field pea, wheat, vetch, and rapeseed. Vertical pressure on the floor of a shallow bin was found to be influenced by the filling method and the seed size and aspect ratio. A significant dip of vertical pressure in the middle radial location was observed in all tests, except two: central and circumferential filling of rapeseed. Wall friction was mobilized in the highest degree in the case of the central filling, while the lowest was mobilization of friction in the case of the circumferential filling.
Źródło:
International Agrophysics; 2017, 31, 2; 167-174
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical Analysis of Bulk Carrier Accident from 2011 to 2020
Autorzy:
Nwigwe, T.
Kiyokazu, M.
Powiązania:
https://bibliotekanauki.pl/articles/2172465.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
bulk carrier accidents
total loss
statistical analyse
safety at sea
maritime accidents
casualty rates
bulk cargo
Opis:
The high rates of casualties in bulk carrier shipping have attracted a worldwide concern for safety and regulatory control from numerous governmental and private agencies. Between 2011 and 2020, a total number of 34 bulk carriers’ ships has been identify as total loos, resulting to the death of 128 seafarers. In this study, the statistically analysis of bulk carrier accident occurring from 2011 to 2020, in terms of their frequency, types of accident, locations of incidents and the factors that influence their occurrence has been reviewed. This study will contribute to decision-making and guidance on rational safety resource allocation that will help reduce the high casualty rates in bulk carrier.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 1; 153--157
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Heat Treatment on the Magnetization Process (within Strong Magnetic Fields) for the Alloy: Fe61Co10Y8Cu1B20
Autorzy:
Gruszka, K.
Nabiałek, M.
Błoch, K.
Powiązania:
https://bibliotekanauki.pl/articles/353778.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bulk amorphous
Kronmüller method
XRD
structural defects
Opis:
Samples of Fe61Co10Y8Cu1B20 alloy were investigated in the ‘approach to ferromagnetic saturation’ region by using the Kronmüller method. The amorphous material was obtained by radially cooling the molten alloy under a protective atmosphere of inert gas. Following this manufacturing process, static magnetic hysteresis loops were measured for samples, before and after a controlled isothermal annealing process, using a LakeShore vibrating magnetometer (VSM). From analysis of the primary magnetization curves, the distribution of structural defects and the average exchange distance for these defects were determined.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 499-502
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Possibilities of Using VI Corridor of Transport for the Alternative Export of Bulk Cargo from Upper Silesia (Poland) to the Mediterranean Countries
Autorzy:
Markusik, Sylwester
Gąska, Damian
Mateusiak, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/504026.pdf
Data publikacji:
2015
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Tematy:
intermodal
transportation corridors
bulk materials
transportation costs
Opis:
The article assesses the possibility of activation of transport and logistics services in relation Silesia – Trieste - Alexandria and by continuation towards India. The increasing demand for transport on this route, where the section will be located onshore in the sixth (and part of fifth) transport corridor and the forecast of traffic on the route for transportation of bulk materials, justify launching intermodal connections there. It is expected that the market for transport in the analyzed route will have significant bulk loads (coal, coke) in the area of Silesia, in the direction to the south of Europe and further by maritime transport to customers in Egypt and India (coke plants, steel mills).
Źródło:
Logistics and Transport; 2015, 27, 3; 33-40
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Factors Contributing to the Risks of Cargo Liquefication Accident in Bulk Carriers (A Qualitative Approach)
Autorzy:
Nwigwe, T.
Minami, K.
Powiązania:
https://bibliotekanauki.pl/articles/2172467.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
bulk carriers
cargo liquefication
risk of cargo liquefication
loading plan
liquidation problem
bulk carrier accidents
assessment of risk
Opis:
Liquidation of cargo in bulk carrier has been identifying as a major hazard affecting the bulk carrier shipping and has resulted to several loss of lives. This study assesses the liquidation problem in bulk carrier shipping, it also discusses the mechanisms by which cargo liquefaction occurs in bulk carrier and the factors influencing the risks of occurrence, based on a qualitative approach. Based on the findings and survey, the unsafe storage condition, poor compliance with the testing and certification of cargoes, poor loading plan, have been identify as some of the root casual factors influencing the risk of liquidation problem in bulk carrier. This study will contribute to increasing the awareness and understanding of the problem of cargo liquefaction and will facilitate the development of regulations that reflects the realities of this problem and assist in the development of future recommendations for mitigation plans against the liquidation problem in bulk carrier.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 1; 149--152
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ aglomeracji w mechanicznie generowanym złożu fluidalnym na gęstość i porowatość modelowej żywności w proszku
The influence of agglomeration in mechanically generated fluid bed on density and porosity of modeled food powders
Autorzy:
Domian, E.
Burdzanowska, D.
Powiązania:
https://bibliotekanauki.pl/articles/288364.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
aglomeracja
gęstość nasypowa
porowatość
agglomeration
bulk density
porosity
Opis:
Celem pracy było zbadanie wpływu parametrów aglomeracji nawilżeniowej poprzez mieszanie (laboratoryjny mieszalnik lemieszowo-płużący Lödige typ L5) na gęstość i porowatość otrzymywanych granulatów. Badano wpływ takich parametrów procesu jak: prędkość mieszadła impelerowego, czas mieszania, ilość i rodzaj cieczy nawilżającej. Zmiana poziomu zmiennych procesu miała bardziej znaczący wpływ na wymiar cząstek niż na gęstość nasypową, porowatość złoża czy gęstość rzeczywistą otrzymywanych aglomeratów.
The laboratory high-shear granulator (the Lödige Plughshare Mixer L5) was tested in a study investigating the influence of various granulation parameters (granulation time, the impeller speed and the amount of binder / water) on granules size, loose and tapped bulk densities, apparent particle density and porosity. Particles size was as a sensitive indicator of changes during granulation.
Źródło:
Inżynieria Rolnicza; 2006, R. 10, nr 2 (77), 2 (77); 255-261
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability of deep submicron MOSFETs
Autorzy:
Balestra, F.
Powiązania:
https://bibliotekanauki.pl/articles/307658.pdf
Data publikacji:
2001
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
bulk MOSFETs
SOI devices
deep submicron
transistors
reliability
Opis:
In this work, a review of the reliability of n- and p-channel Si and SOI MOSFETs as a function of gate length and temperature is given. The main hot carrier effects and degradation are compared for bulk and SOI devices in a wide range of gate length, down to deep submicron. The worst case aging, defice lifetime and maximum drain bias that can be applied are addressed. The physical mechanisms and the emergence of new phenomena at the origin of the degradation are studied for advanced MOS transistors. The impact of the substrate bias is also outlined.
Źródło:
Journal of Telecommunications and Information Technology; 2001, 1; 12-17
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of tool wear on material flow
Autorzy:
Schindlerová, V.
Šajdlerová, I.
Powiązania:
https://bibliotekanauki.pl/articles/102645.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
bulk forming of metals
tools
material wear
prediction
Opis:
The cold bulk forming is a technology that is commonly used in many industrial enterprises. Even though nowadays high demands are posed on labour productivity, quality and own production costs, the findings from practice suggest that not sufficient attention is paid to the issue of tool management. Also, theoretical backgrounds and knowledge in this area are not processed in a sufficiently detailed and comprehensive way. This paper deals with the issue of prediction of the wear surface of the forming tools and their subsequent renewal. The research at selected materials was focused on the course of their straining in contact of the blank with the tool in the process of cold bulk forming. The experiments were based on a simple performance of the conventional upsetting test. On the basis of analysis of the results the mechanism of tool wear by abrasion was determined and its impact on the service life time of the tool and also the possibility of influencing the quality of final parts were evaluated.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 1; 161-165
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soil physical properties affected by biochar addition at different plant phaenological phases. Part II
Autorzy:
Mako, A.
Barna, G.
Horel, A.
Powiązania:
https://bibliotekanauki.pl/articles/2082863.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
biochar
aggregate size distribution
hydraulic
conductivity
bulk density
Opis:
A great emphasis has been placed on biochar addition to soils to improve its physical, chemical, and biological properties in recent times in order to achieve improved crop growth and yields. The present study explored to soil physical changes through different plant growth stages caused by biochar addition to silt loam soil in a pot-experiment. Our research focused on changes in soil bulk density, aggregate size distribution, and saturated hydraulic conductivity. The soils were amended with different amounts of biochars (control with 0, BC0.5 with 0.5%, BC2.5 with 2.5%, and BC5.0 with 5.0% biochar, by weight). Capsicum annuum L. were planted at a two-four leaf stage. Soil samples were taken at 6, 10 and 12 weeks after planting. The biochar amendment resulted in a significant decrease in soil bulk density values. Soil saturated hydraulic conductivity values ranged between 5.5 and 7.9 times higher for all treatments compared to the controls.
Źródło:
International Agrophysics; 2020, 34, 1; 1-7
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficient method for storage of long conveyor belts passages inside the bulk containers
Metoda gromadzenia długich odcinków taśm przenośnikowych nawiniętych w kasetach
Autorzy:
Łuszczkiewicz-Piątek, M.
Pypno, Cz.
Łuszczkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/374242.pdf
Data publikacji:
2011
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
opakowanie zbiorcze
przenośnik taśmowy
conveyor belt
bulk containers
Opis:
The paper introduces the family of the algorithms designed to improve the process of winding up the long conveyor belt passages on reels located inside the bulk containers, used for i.e. rail transport. The proposed method provides the convenient storage technique of the long belt passages , enabling their transport on the standardized rail wagons. Presented solution also addresses the problems related with binding the smaller belt passages, such as shorter life span in comparison to the single-part belt. Moreover, the presented work contains not only the details of the two algorithms representative for the proposed method, but also the outlook of the system of the automatic control required for the successful application of the proposed technique.
Artykuł przedstawia rodzinę algorytmów zastosowanych do długich odcinków taśm przenośnikowych nawijanych na bębny w kasetach przystosowanych do transportu szynowego. Zaproponowana metoda przedstawia sposób gromadzenia długich odcinków taśm przenośnikowych na typowych wagonach kolejowych. Prezentowane rozwiązanie pozwala wyeliminować problemy związane z łączeniem krótkich odcinków taśm w całość. Ponadto w pracy przedstawiono oprócz dwóch dokładnych algorytmów proponowanej metody także pogląd na system automatycznego sterowania przedmiotowego rozwiązania.
Źródło:
Transport Problems; 2011, 6, 3; 77-85
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A survey of anti-Ostertagia ostertagii antibody levels in bulk tank milk samples (BTM) in dairy herds in Lower Silesia Region (Poland)
Autorzy:
Ploneczka-Janeczko, K.
Piekarska, J.
Rypula, K.
Mazurkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/31890.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bulk tank milk
Lower Silesian region
Ostertagia ostertagi
Polska
antibody level
bulk tank
herd
bulk tank milk sample
ELISA test
optical density ratio
parasite
animal infection
production loss
cattle
dairy cattle
Opis:
This work presents serological evidence of cattle ostertagiosis in the Lower Silesia Region (Poland), based on the measurement of antibodies in bulk tank milk (BTM) samples. It represents the first evidence of this parasite examined with the use of the ELISA test and milk samples in Poland. The prevalence of Ostertagia ostertagii antibodies was determined in BTM from 32 dairy cattle herds. Antibodies to O. ostertagii were demonstrated in all herds. The optical density ratio (ODR) varied from -0.088 to 1.024. The mean ODR value in the examined region was 0.53.
Źródło:
Polish Journal of Veterinary Sciences; 2011, 14, 1
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic measurement and simulation of bulk solids during silo discharge
Autorzy:
Ostendorf, M.
Schwedes, J.
Antes, H.
Böhrnsen, J. U.
Powiązania:
https://bibliotekanauki.pl/articles/1955768.pdf
Data publikacji:
2003
Wydawca:
Politechnika Gdańska
Tematy:
bulk solid
silo
load cells
FEM
hypoplasticity
viscosity
Opis:
This paper deals with the experimental investigation and numerical simulation of silo discharge processes, including dynamic interactions between silo filling and elastic silo walls. The experiments have taken place in a large model silo with a height of 3m and a rectangular base of 800 to 400mm. Optical measurement techniques have been applied to investigate the flow profile, while load cells on the silo walls have registered the stress' evolution, e.g. a stress peak (switch) move from the outlet to the transition of hopper and shaft. The measured data have been compared with simulation results of the Institute of Applied Mechanics at the Technical University of Braunschweig. It has been possible because the numerical simulation examples have been chosen to be similar to the experimental test silo. The discharge process in the simulation is described by a system of nonlinear differential equations. Via the Finite Element Method (FEM) based on an Eulerian reference frame deformation rate, velocity field, porosity and stress distribution can be calculated without the need for re-meshing the FE grid.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 4; 611-621
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 248

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