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  • 1
    Electronic Resource
    Electronic Resource
    Handbook for grease applications (2000)
    Bradford : Emerald
    Industrial lubrication & tribology 52 (2000), S. 221-232 
    Details
    ISSN: 0036-8792
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The process of finding the ultimate grease is described in this report using an example from railway applications. This example includes steps such as a requirement list, field tests, laboratory tests and an evaluation method. The example deals with the problems discovered in a field test performed to determine the best grease for tapered roller bearings in railway wagon wheels and to increase the knowledge of grease lubrication. Seven different fully formulated commercial greases were examined in the wheel bearings of one ore wagon, used for transporting ore commercially by railway from the Kiruna Mine in northern Sweden to Narvik in northern Norway for shipping to foreign markets. The steps performed in this study are recommended in all problems associated with finding the optimal grease for different types of applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/00368790010373184
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  • 2
    Electronic Resource
    Electronic Resource
    Grease-lubrication of roller bearings in railway waggons. Part 2: laboratory tests and selection of proper test methods (2000)
    Bradford : Emerald
    Industrial lubrication & tribology 52 (2000), S. 76-86 
    Details
    ISSN: 0036-8792
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: New, undestroyed greases of the same brands as those used in a field test, described in Part 1, were examined using conventional methods, such as the SKF V2F test, the roll stability test (ASTM D-1831), the Grease Worker (ASTM D-217), the torque test (ASTM 1478-91), bleeding measurements ( IP 121), yield stress measurements, the 4-ball test (ASTM D 2266-86), base oil viscosity measurements, thickener content and the cone penetration test (ASTM D217-88). The greases have also been tested with several new test methods developed at the University. A specification for relevant testing methods was drawn up and the connections between the tested parameters were investigated. It was found that the mechanical stability could be predicted with a combination of ASTM D-1831 and the limiting shear stress coefficient ?. This coefficient is capable of predicting wear. It was found that the bearing temperature could be predicted by using the base oil viscosity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/00368790010317366
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  • 3
    Electronic Resource
    Electronic Resource
    A study of sample withdrawal for lubricated systems. Part 2: practical sample withdrawal and selection of proper sampling methods (2001)
    Bradford : Emerald
    Industrial lubrication & tribology 53 (2001), S. 97-108 
    Details
    ISSN: 0036-8792
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Aims to use some of the sampling techniques and sampling routines, mentioned in Part 1 of the article, to perform practical tests to determine their differences in withdrawing samples. Uses two different types of systems, a hydraulic system and a gear system, together with some of the investigated sampling techniques. In order to find out the optimum sampling method for each of the two systems, uses a specification of requirements and a systematic approach, together with practical sample withdrawal from the two systems. For the hydraulic system, uses an on-line particle counter and bottle samples from valves, and for the gear system, applies drain-plug and vacuum pump sampling. It was found that for hydraulic systems on-line sampling is the most appropriate, if information on the elements is not required. If information on the elements is required, bottle sampling from a valve together with flushing of the valve should be performed. For the gear system no difference was seen between the samples taken with a vacuum pump and those taken from the drain-plug, and therefore an alternative method is suggested to improve the reliability of the sampling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/00368790110390184
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  • 4
    Electronic Resource
    Electronic Resource
    A study of sample withdrawal for lubricated systems. Part 1: influence of flow characteristics, sampling techniques and locations (2001)
    Bradford : Emerald
    Industrial lubrication & tribology 53 (2001), S. 22-32 
    Details
    ISSN: 0036-8792
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The wear of a machine element, whether it is due to fatigue or abrasive wear, will add contaminants in the form of particulates to the system. If a machine element is starting to wear out it will produce a large amount of particles and it will finally break down. Since this can be very costly, one can establish the need to monitor the system so that one can foresee failure. There are many different ways to monitor a system, e.g. measurements of the temperature, pressure, vibrations and the degree of contamination. The purpose of contamination control is to extend the life of a component and thereby save money. When monitoring a system it is very important that the monitoring control instrument should give the right output. One important factor in achieving this is the withdrawal of a representative oil sample. In this paper an investigation of where and how to take a representative sample is performed using Stokes' law and the migration of spheres in a channel. A generalised sedimentation chart for different oils and particles is introduced. Sampling routines for proper sample withdrawal are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/00368790110380635
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  • 5
    Electronic Resource
    Electronic Resource
    Voting cycles, plurality rule and strategic manipulation (1990)
    Springer
    Annals of operations research 23 (1990), S. 247-256 
    Details
    ISSN: 1572-9338
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract In this note, we investigate the connection between the existence of cycles and the opportunities of strategic manipulation under a specific social decision function, the plurality rule. Contrary to previous research in this field, voting cycles are considered as a possible cause rather than a consequence of strategic voting. The results we obtain allow us to evaluate the vulnerability of the plurality rule to strategic voting, and to study how the distribution of voters over preference orderings affects the risk of manipulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02204849
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  • 6
    Electronic Resource
    Electronic Resource
    A note on the paradox of voting: Anonymous preference profiles and May's formula (1983)
    Springer
    Public choice 40 (1983), S. 307-316 
    Details
    ISSN: 1573-7101
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00114526
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  • 7
    Electronic Resource
    Electronic Resource
    Paradox of voting under an urn model: The effect of homogeneity (1985)
    Springer
    Public choice 47 (1985), S. 377-387 
    Details
    ISSN: 1573-7101
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract We propose a simple Pólya-variety urn model for calculating paradox-of-voting probabilities. The model contains a homogeneity parameter, and for specific values of this parameter the model reduces to cases previously discussed in the literature. We derive a Dirichlet family of distributions for describing the assignment of preference profiles in large committees, and we show how the homogeneity parameter relates to measures of similarity among voters, suggested in prior studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00127533
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  • 8
    Electronic Resource
    Electronic Resource
    The probability of casting a decisive vote: The effects of a caucus (1990)
    Springer
    Public choice 64 (1990), S. 73-92 
    Details
    ISSN: 1573-7101
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract We study the effects of caucus formation upon a voting process with the aid of a Pólya-Eggenberger probability model. The model contains a parameter interpretable as cohesiveness between voters in a voting body. We examine relationships among members' voting power, satisfaction, and group cohesiveness. We also explore the likelihood of a distortion of opinion resulting from the caucus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00125918
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  • 9
    Electronic Resource
    Electronic Resource
    Condorcet's jury theorem, dependency among jurors (1993)
    Springer
    Social choice and welfare 10 (1993), S. 87-95 
    Details
    ISSN: 1432-217X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Sociology , Economics
    Notes: Abstract With the aid of a simple discrete probability model, the Condorect Jury Theorem is extended to situations where there is dependency between judgement. It is shown that negative intra-voter correlation improves on jury competence in the sense that the probability of a correct decision increases. Positive correlation, on the other hand, tends to decrease jury competence. The results given here are obtained with the aid of simple recursion relations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00187435
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  • 10
    Electronic Resource
    Electronic Resource
    The effect of social homogeneity on coincidence probabilities for pairwise proportional lottery and simple majority rules (1992)
    Springer
    Social choice and welfare 9 (1992), S. 361-372 
    Details
    ISSN: 1432-217X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Sociology , Economics
    Notes: Abstract The Condorcet efficiency of Pairwise Proportional Lottery Rules (PPLR) is considered under various assumptions concerning the likelihood that given voters' preference profiles are observed on three alternatives. Representations are developed for the expected Condorcet efficiency under impartial culture, impartial anonymous culture, and a generalization to Pólya-Eggenberger distributions. PPLR is shown to be equivalent to a random selection process in the limit of voters under impartial culture. However, relatively small increases in social homogeneity, as measured by Kendall's Coefficient of Concordance, cause significant increases in the Condorcet efficiency of PPLR.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00182576
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