1,796 research outputs found
The Case Against Bullet, Approval and Plurality Voting
The author pursues his inquiry into the paradoxes of voting systems and shows that bullet, approval and plurality voting can have most unlooked-for consequences.
This research was carried out in collaboration with the System and Decision Sciences Program
Directional characteristics of lunar thermal emission
Directional characteristics and brightness temperatures of thermal lunar emissio
Dynamics of Macrosystems; Proceedings of a Workshop, September 3-7, 1984
There is an increasing awareness of the important and persuasive role that instability and random, chaotic motion play in the dynamics of macrosystems. Further research in the field should aim at providing useful tools, and therefore the motivation should come from important questions arising in specific macrosystems. Such systems include biochemical networks, genetic mechanisms, biological communities, neutral networks, cognitive processes and economic structures. This list may seem heterogeneous, but there are similarities between evolution in the different fields. It is not surprising that mathematical methods devised in one field can also be used to describe the dynamics of another.
IIASA is attempting to make progress in this direction. With this aim in view this workshop was held at Laxenburg over the period 3-7 September 1984. These Proceedings cover a broad canvas, ranging from specific biological and economic problems to general aspects of dynamical systems and evolutionary theory
Symmetry, bifurcation and stacking of the central configurations of the planar 1+4 body problem
In this work we are interested in the central configurations of the planar
1+4 body problem where the satellites have different infinitesimal masses and
two of them are diametrically opposite in a circle. We can think this problem
as a stacked central configuration too. We show that the configuration are
necessarily symmetric and the other sattelites has the same mass. Moreover we
proved that the number of central configuration in this case is in general one,
two or three and in the special case where the satellites diametrically
opposite have the same mass we proved that the number of central configuration
is one or two saying the exact value of the ratio of the masses that provides
this bifurcation.Comment: 9 pages, 2 figures. arXiv admin note: text overlap with
arXiv:1103.627
Voting and the Cardinal Aggregation of Judgments
The paper elaborates the idea that voting is an instance of the aggregation of judgments, this being a more general concept than the aggregation of preferences. To aggregate judgments one must first measure them. I show that such aggregation has been unproblematic whenever it has been based on an independent and unrestricted scale. The scales analyzed in voting theory are either context dependent or subject to unreasonable restrictions. This is the real source of the diverse 'paradoxes of voting' that would better be termed 'voting pathologies'. The theory leads me to advocate what I term evaluative voting. It can also be called utilitarian voting as it is based on having voters express their cardinal preferences. The alternative that maximizes the sum wins. This proposal operationalizes, in an election context, the abstract cardinal theories of collective choice due to Fleming and Harsanyi. On pragmatic grounds, I argue for a three valued scale for general elections
Strongyloides stercoralis infection in a Finnish kennel
Background: Intestinal threadworm Strongyloides stercoralis is a parasite of dog, cat and primates
that occurs worldwide being most prevalent in tropical and subtropical countries. The adult
parasitic worm is about 2 mm long and slender. It possesses both parasitic and free-living lifecycles.
The parasitic worms are females. Strongyloides stercoralis infects the host via percutaneous, peroral
or transmammary transmission in addition to autoinfection. Clinical disease varies from inapparent
to severe enteritis and pneumonia. The diagnosis is based on demonstration of larvae in fresh
faeces, which is best made by Baermann technique.
Case presentation: Strongyloides stercoralis infection was diagnosed in autopsy in a 10-week-old
puppy born and raised in a Finnish kennel. Prior to its sudden death, the puppy had suffered from
gastrointestinal disturbance for three weeks. Subsequent sampling of the dogs in the kennel
revealed that three adult dogs in the kennel were also infected.
Conclusion: The present case shows that S. stercoralis can complete its life cycle and cause disease
in dogs also in Northern Europe. Infection can be maintained also in a temperate climate and may
become a chronic problem in a kennel environment. Infection may be underdiagnosed as Baermann
technique is not routinely performed in small animal practice
Altitude Investigation of Performance of Turbine-propeller Engine and Its Components
An investigation was conducted on a turbine-propeller engine in the NACA Lewis altitude wind tunnel at altitudes from 5000 to 35,000 feet. The applicability of generalized parameters to turbine-propeller engine data, analyses of the compressor, the combustion chambers, and the turbine, and a study of the over-all engine performance are reported. Engine performance data obtained at sea-level static conditions could be used to predict static performance at altitudes up to 35,000 feet by use of the standard generalized parameters
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