bluuebunny/crossref_metadata_2025_split huggingface dataset:
Calculation of the mean long-term service speed of transport ship: Part II Service speed of ship sailing on regular shipping route in real weather conditions
Authors: Szelangiewicz Tadeusz , Żelazny Katarzyna 
Published: May 2008

Calculation of the mean long-term service speed of transport ship: Part II Service speed of ship sailing on regular shipping route in real weather conditions
Service speed obtainable by a ship in real weather conditions when sailing on a given shipping route, is one of the major parameters which have great impact on ship operation costs. The so far used, very approximate method of service speed prediction based on "service margin", is very little exact. In this paper a new method based on additional ship resistance dependent on mean statistical parameters of wave and wind occurring on a given shipping route, is presented. The mean long-term service speed is calculated on the basis of the calculated additional resistance and the screw propeller and propulsion engine parameters. Also, a new definition of service margin and a way of its calculation is presented apart from the results of the mean service speed calculation depending on ship's type and size and shipping route.
Identification of service failures of cylinder valves of ship piston combustion engines
Authors: Korczewski Zbigniew 
Published: May 2008

Identification of service failures of cylinder valves of ship piston combustion engines
This paper presents selected diagnostic problems of charge exchange system of ship piston combustion engines. Theoretical background of wear process of cylinder valves was highlighted in the aspect of identification and sources of known and identifiable states of unserviceability. The presented results of endoscopic examinations concern failures of cylinder valves of the engines installed on Polish Navy ships.
Application of fuzzy inference to assessment of degree of hazard to ship power plant operator
Authors: Kowalewski Tomasz , Podsiadło Antoni , Tarełko Wiesław 
Published: May 2008

Application of fuzzy inference to assessment of degree of hazard to ship power plant operator
This paper presents application of fuzzy logic to assessment of degree of hazard to ship power plant operator. For the assessment a system of computer-aided identification of hazardous zone within ship power plant, was used. The system's variables representing the subject-matter knowledge in safety design area were transformed into fuzzy sets by means of appropriate linguistic variables and membership functions. The assessing of safety level of operator with the use of fuzzy inference was performed by means of an expert system programmed in the PROLOG LPA language.
An analysis of possible assessment of hazards to ship shaft line, resulting from impulse load
Authors: Grządziela Andrzej 
Published: May 2008

An analysis of possible assessment of hazards to ship shaft line, resulting from impulse load
This paper presents a proposal of identification of a degree of hazard to ship shaft line due to impulse load caused by underwater explosion. A theoretical analysis was made of influence of changes in co-axiality of shafts on second-kind critical velocities resulting from elastic deformations of hull structure in vicinity of shaft bearing foundations. Results are presented of pilotage tests of underwater explosion performed on training water area. A preliminary mathematical model of underwater explosion is given with taking into account mass of explosives and distance from the tested object. The drawn conclusions show a way of identification of hazard to shaft line by using spectral analysis and time - runs of vibration signals recorded at shaft bearings.
Approximation of the index for assessing ship sea-keeping performance on the basis of ship design parameters
Authors: Cepowski Tomasz 
Published: May 2008

Approximation of the index for assessing ship sea-keeping performance on the basis of ship design parameters
This paper presents a new approach which makes it possible to take into account seakeeping qualities of ship in the preliminary stage of its design. The presented concept is based on representing ship's behaviour in waves by means of the so called operational effectiveness index. Presented values of the index were calculated for a broad range of design parameters. On this basis were elaborated analytical functions which approximate the index depending on ship design parameters. Also, example approximations of the index calculated by using artificial neural networks, are attached. The presented approach may find application to ship preliminary design problems as well as in ship service stage to assess sea-keeping performance of a ship before its departure to sea.
Modelling the characteristics of axial compressor of variable flow passage geometry, working in the gas turbine engine system
Authors: Wirkowski Paweł 
Published: May 2008

Modelling the characteristics of axial compressor of variable flow passage geometry, working in the gas turbine engine system
This paper concerns application of mathematical modelling methods to analyzing gas-dynamic processes in marine gas turbines. Influence of geometry changes in axial compressor flow passage on kinematical air flow characteristics, are presented. The elaborated mathematical model will make it possible to realize - in the future - simulative investigations of gas-dynamic processes taking place in a compressor fitted with controllable guide vanes.
A method for selection of parameters of ship propulsion system fitted with compromise screw propeller
Authors: Michalski Jan 
Published: May 2008

A method for selection of parameters of ship propulsion system fitted with compromise screw propeller
This paper concerns an algorithmic method for preliminary selection of parameters of ship propulsion system fitted with fixed screw propeller in the case when the ship's operation is associated with significant changes of waterway depth and width, hull resistance of the ship and its service speed. Mathematical model arguments of the considered design problem are main ship design parameters identified in the preliminary design stage. Structure of the formulated model complies with formal requirements for continuous- discrete mathematical optimization problems. The presented examples of application of the method concern an inland waterways ship fitted with compromise screw propeller optimized in the sense of minimization of fuel consumption for passing a given route distance within a given time. The elaborated method may be especially useful in designing such ships as: coasters, inland waterways ships, tugs, pushers, trawlers, mine sweepers, icebreakers etc.
Mean long-term service parameters of transport ship propulsion system: Part I Screw propeller service parameters of transport ship sailing on a given shipping route
Authors: Szelangiewicz Tadeusz , Żelazny Katarzyna 
Published: May 2008

Mean long-term service parameters of transport ship propulsion system: Part I Screw propeller service parameters of transport ship sailing on a given shipping route
During ship sailing on a given shipping route in real weather conditions all propulsion system performance parameters of the ship change along with changes of instantaneous total resistance and speed of the ship. In this paper results of calculations are presented of distribution function and mean statistical values of screw propeller thrust, rotational speed and efficiency as well as propulsion engine power output and specific fuel oil consumption occurring on selected shipping routes. On this basis new guidelines for ship propulsion system design procedure are formulated.
Prediction of power demand for ship motion control system of sea mining ship fitted with tubular winning system
Authors: Bortnowska Monika 
Published: May 2008

Prediction of power demand for ship motion control system of sea mining ship fitted with tubular winning system
One of the crucial systems of sea mining ship for poly-metallic concretions is its motion control system (SMC). Power of such system depends on sea environment characteristics and main dimensions of the ship. It can be expected that it will have important influence on total power of the ship's power plant and in effect on the mining ship's dimensions. In this paper is presented one of the possible ways of preliminary estimation of design power of SMC system for sea mining ship. Since details of design solution of such system for the ship in question are unknown (ships of the kind have not been built so far) the presented results should be considered to be the first estimation of the order of the power demand.
Application of artificial neural networks to approximation and identification of sea-keeping performance of a bulk carrier in ballast loading condition
Authors: Cepowski Tomasz 
Published: May 2008

Application of artificial neural networks to approximation and identification of sea-keeping performance of a bulk carrier in ballast loading condition
This paper presents an application of artificial neural networks to approximation and identification of additional wave-generated resistance, slamming and internal forces depending on ship motion and wave parameters. The analysis was performed for a typical bulk carrier in ballast loading conditions. The investigations were carried out on the basis of ship response data calculated by means of exact numerical methods. Analytical functions presented in the form of artificial neural networks were analyzed with a view of their accuracy against standard values. Possible ways of application of the artificial neural networks were examined from the point of view of accuracy of approximation and identification of the assumed ship response parameters.
Identification of hydro-acoustic waves emitted from floating units during mooring tests
Authors: Kozaczka Eugeniusz , Domagalski Jacek , Grelowska Grażyna , Gloza Ignacy 
Published: May 2008

Identification of hydro-acoustic waves emitted from floating units during mooring tests
Measurements of hydro-acoustic noise emitted from vessels are a.o. a subject of the tests carried out in the control measurement ranges of the Navy. The measurements are performed both on anchored and floating vessels. Acoustic field of vessels is changing along with their speed changing and is associated with acoustic activity of wave sources installed in vessel's hull (main engines, electric generating sets, reduction gears, pumps, shaft-lines, piping, ventilating ducts etc) as well as hydro-dynamic sources such as screw propellers and water flow around the hull [5, 7]. Vibration energy generated by the onboard devices is transferred through ship structural elements to water where it propagates in the form of hydro-acoustic waves of a wide frequency band.
An analysis of lubricating medium flow through unsymmetrical lubricating gap of conical slide bearing
Authors: Koprowski Mariusz 
Published: May 2008

An analysis of lubricating medium flow through unsymmetrical lubricating gap of conical slide bearing
This paper presents a computer analysis of lubricating medium flow through unsymmetrical lubricating gap of conical slide bearing. Numerical calculations were carried out with the use of the software Matlab 7.1 and Mathematica 5.2 for example conical slide bearings of different values of cone apex angles of pin and sleeve and set values of relative eccentricity and skewing angle as well as dimensionless bearing length equal to 1.
The influence of organic polymer on properties of mineral concentrates: Part I
Authors: Popek Marzenna 
Published: May 2008

The influence of organic polymer on properties of mineral concentrates: Part I
The property is evaluated when acceptance for loading of solid bulk cargoes is judged prior to shipment. The liquefaction can be prevented by means of limiting the moisture content of the cargo by introducing the safety margin, regardless of the condition of stresses. It is rational to limit the moisture content of cargoes, which may liquefy, because liquefaction is not liable to occur when the degree of saturation is low, even if the permeability of the material is low. To prevent sliding and shifting of ore concentrates in storage biodegradable thermoplastic materials were added to the ore. The polymer absorbs water from the particle pore in mineral concentrates and its moisture content goes down. In consequence, polymer prevents: drainage of water from the particle pore, sliding and shifting of ore concentrates in storage.
An overview of the didactic and scientific activity at the faculty of mechanical and electrical engineering of the Polish Naval Academy
Authors: Korczewski Zbigniew 
Published: May 2008

An overview of the didactic and scientific activity at the faculty of mechanical and electrical engineering of the Polish Naval Academy
The article characterises the didactic and scientific activity at the Faculty of Mechanical and Electrical Engineering of the Polish Naval Academy. The current didactic offer and the areas of current research work are presented, along with main characteristics expected from the naval-specialisation graduate majoring in mechanics and machinery construction, in the context of the Polish Navy technical staff education system. Discussed are the subjects of research activities initiated in particular Faculty units, and leading scientific problems which have been studied for years within the field of widely understood utilisation of naval technology.
Book Notices
Authors: Stalmaszczyk Piotr 
Published: May 2008

Donald Davidson The Essential Davidson (with an introduction by Ernie Lepore and Kirk Ludwig). Oxford: Clarendon Press, 2006, 282 pp.
Claudia Maienborn and Angelika Wöllstein (eds), Event Arguments: Foundations and Applications (Linguistische Arbeiten 501). Tübingen: Max Niemeyer Verlag, 2005, vi + 368.
Performance Of Static Positioning For Medium Distances Based On Data From A Virtual Reference Station And ASG-PL Network
Authors: Bakuła M. 
Published: May 2008

Performance Of Static Positioning For Medium Distances Based On Data From A Virtual Reference Station And ASG-PL Network
The use of a network of reference stations instead of a single reference station allows the modelling of some systematic errors in a region and allows a user to increase the distance between the rover receiver and reference stations. In some countries, GPS reference stations exist and GPS observations are available for users in real-time mode and in postprocessing. Observations from several GPS reference stations in a regional network enable modelling spatially-correlated errors and their modelling on an epoch-by-epoch and satellite-by-satellite basis. As a result, observations of a virtual reference station can be created at a rover's approximate position and its observations can be used in the precise baseline positioning of the rover. This paper presents the performance of the static positioning of a rover station, its quality and reliability for two different baselines. Single-baseline and network static solutions are presented and compared. Network solutions are based on data from a virtual reference station (VRS) obtained by the Wasoft/Virtuall software. In both cases, the same strategy of ambiguity resolution was used. These approaches have been tested with the use of 24-hour GPS data from the Polish Active Geodetic Network (ASG-PL). The data from three reference stations with medium-range separation were used in the process of generating VRS data. GPS data of the rover station were divided into 20, 10 and 5-min. sessions with a sampling interval of 5 sec. Practical calculations and analyses of horizontal and vertical accuracy of coordinates clearly show the improvement of static positioning in terms of time observation span and ambiguity reliability.
Performance of Open Source Precise Point Positioning Software Using Single-Frequency GPS Data
Authors: Satirapod Chalermchon , Kriengkraiwasin Somchai 
Published: May 2008

Performance of Open Source Precise Point Positioning Software Using Single-Frequency GPS Data
This research aims to assess the performance of GPS Precise Point Positioning (PPP) with code and carrier phase observations from L1 signal collected from geodetic GPS receiver around the world. A simple PPP software developed for processing the single frequency GPS data is used as a main tool to assess a positioning accuracy. The precise orbit and precise satellite clock corrections were introduced into the software to reduce the orbit and satellite clock errors, while ionosphere-free code and phase observations were constructed to mitigate the ionospheric delay. The remaining errors (i.e. receiver clock error, ambiguity term) are estimated using Extended Kalman Filter technique. The data retrieved from 5 IGS stations located in different countries were used in this study. In addition, three different periods of data were downloaded for each station. The obtained data were then cut into 5-min, 10-min, 15-min and 30-min data segments, and each data segment was individually processed with the developed PPP software to produce final coordinates. Results indicate that the use of 5-min data span can provide a horizontal positioning accuracy at the same level as a pseudorange-based differential GPS technique. Furthermore, results confirm effects of station location and seasonal variation on obtainable accuracies.
Sensitivity of Adop to Changes in the Single-Baseline GNSS Model
Authors: Odijk D. , Teunissen P. 
Published: May 2008

Sensitivity of Adop to Changes in the Single-Baseline GNSS Model
The ADOP (Ambiguity Dilution Of Precision) is a measure for the precision of the carrier phase ambiguities involved in precise relative GNSS positioning. By computing the ADOP one may get knowledge in whether ambiguity resolution can be expected successful or not, already in a stage before the GNSS data are collected. In Odijk and Teunissen (2008) compact closed-form expressions have been derived for the ADOP of single-baseline GNSS models. In this paper these expressions are used to study the impact of certain changes in these models, as there are the observation time span, the weighting of the ionospheric delays, the number of frequencies, the weights of the phase and code data, the number of satellites, elevation-dependent observation weights and taking linear combinations of data.
Naturalistic Descriptions and Normative-Intentional Interpretations
Authors: Prien Bernd 
Published: May 2008

Naturalistic Descriptions and Normative-Intentional Interpretations
Normative pragmatists about linguistic meaning such as Sellars and Brandom have to explain how norms can be implicit in practices described in purely naturalistic terms. The explanation of implicit norms usually offered in the literature commits pragmatists to equate actions with naturalistic events. Since this is an unacceptable consequence, I propose an alternative explanation of implicit norms that avoids this identification. To do so, one has to treat the normative-intentional concepts such as "norm", "action", "sanction", "belief", "desire" as a holistic system, in the sense that one has to apply all of them to a given naturalistic practice simultaneously. This result might be taken to imply that the pragmatist strategy of explaining the content of assertions and beliefs in terms of norm-governed use is misguided because it presupposes that one can account for the concept "norm" independently of the concept "belief". I argue that this consequence does not follow.
Mortality as a Philosophical-Anthropological Issue: Thanatology, Normativity, and "Human Nature"
Authors: Pihlström Sami 
Published: May 2008

Mortality as a Philosophical-Anthropological Issue: Thanatology, Normativity, and "Human Nature"
This paper examines mortality—the fact that we humans are all going to die—as an issue in philosophical anthropology, by applying a fourfold typology of some key forms of philosophical anthropology to the topic of death and mortality. First, this typology, originally suggested by Heikki Kannisto, is outlined; the mortality issue is, then, viewed from the perspective it opens. Finally, the challenges to our understanding of death and mortality that this perspective may help us meet are discussed. The treatment of mortality from the perspective of philosophical anthropology may make it more understandable in a manner that will highlight the importance of the concept of normativity in the philosophical examination of any such humanly relevant issue.
Rorty and Normativity
Authors: Kremer Alexander 
Published: May 2008

Rorty and Normativity
The paper summarizes some of the main ideas in Rorty's philosophy and indicates the views he holds on normativity. As a neopragmatic thinker, Rorty wants as little normativity as possible, but this does not mean that he rejects all types of normativity.
Social Theory, Performativity and Professional Power—A Critical Analysis of Helping Professions in England
Authors: Powell Jason , Carey Malcolm 
Published: May 2008

Social Theory, Performativity and Professional Power—A Critical Analysis of Helping Professions in England
Drawing from interviews and ethnographic research, evidence is provided to suggest a sense of "anxiety" and "regret" amongst state social workers and case managers working on the "front-line" within local authority social service departments. There have been a number of theoretical approaches that have attempted to ground the concept of "power" to understand organizational practice though Foucauldian insights have been most captivating in illuminating power relations and subject positioning. In order to theoretically interrogate the relationship between social theory and professional power, we draw from the neo-Foucauldian work of American Social Philosopher Judith Butler—especially regarding Butler's (1990, 1993 and 1998) powerful work on "performativity" and its relationship to social work. We also attempt to examine the "distances" between the social work role and social workers narratives through an examination of notions of "anxiety" and "regret" in the face of the professionalisation of state social work.
Recruitment and Reproduction: The Careers and Carriers of Digital Photography and Floorball
Authors: Shove Elizabeth , Pantzar Mika 
Published: May 2008

Recruitment and Reproduction: The Careers and Carriers of Digital Photography and Floorball
The claim that social practices have a relatively durable existence in space and time, and that their persistence depends upon their recurrent reproduction through necessarily localised performances is theoretically plausible, but what of the detail? How do the careers of practices and those who "carry" them actually intersect? In this paper we have two related ambitions. One is to show how selected practices are concurrently shaped by the ebb and flow of recruits and defectors and by what it is that cohorts of practitioners actually do. The second is to learn more about the relation between recruitment and reproduction by comparing the ways in which these processes play out in different situations. In taking these two ambitions forward through a discussion of digital and film photography and of floorball (a team game in which players use plastic sticks to hit a small ball into a goal) we explore ways of concretely examining processes that are implied in Giddens' theory of structuration (1984) and in Bourdieu's concept of habitus (1984). This exercise generates insights into the internal dynamics of practice and the methodological challenges of pinning them down.