Search results for "VARIATION"

Sequential versus Simultaneous Schelling Models: Experimental Evidence

2010

This article shows the results of experiments where subjects play the Schelling’s spatial proximity model. Two types of experiments are conducted: one in which choices are made sequentially and a variation of the first where the decision making is simultaneous. The results of the sequential experiments are identical to Schelling’s prediction: subjects finish in a segregated equilibrium. Likewise, in the variant of the simultaneous decision experiment, the same result is reached: segregation. Subjects’ heterogeneity generates a series of focal points in the first round. To locate themselves, subjects use these focal points immediately, and as a result, the segregation takes place again. Fur…

The complex business of survival by aposematism.

2005

The theory of warning signals dates back to Wallace but is still confusing, controversial and complex. Because predator avoidance of warningly coloured prey (aposematism) is based upon learning and reinforcement, it is difficult to understand how initially rare conspicuous forms subsequently become common. Here, we discuss several possible resolutions to this apparent paradox. Many of these ideas have been largely ignored as a result of implicit assumptions about predator behaviour and assumed lack of variation in the predators, prey and the predation process. Considering the spatial and temporal variation in and mechanisms of behaviour of both predators and prey will make it easier to unde…

Mate Choice for Genetic Benefits: Time to Put the Pieces Together

2010

It is thought that mate choice allows individuals to obtain genetic benefits for their offspring, and although many studies have found some support for this hypothesis, several critical questions remain unresolved. One main problem is that empirical studies on mate choice and genetic benefits have been rather piecemeal. Some studies (1) aimed to test how mate choice affects offspring fitness, but have not examined whether the benefits are because of genetic effects. Other studies tested whether mate choice provides (2) additive or (3) non-additive genetic benefits and only a few studies (4) considered these genetic effects together. Finally, some studies (5) examined whether the potential b…

Evolutionary selection and variation in family businesses

2011

PurposeThis qualitative study attempts to understand what kinds of evolutionary selection and variation occur in family businesses during the preparation of a managerial and ownership succession.Design/methodology/approachThe study was conducted by interviewing members of one family business in Louisiana, USA and one in Finland in order to contribute to the understanding of succession preparation in small family businesses with two generations. Evolutionary economics was adapted for this interdisciplinary study to explain evolutionary changes in a family business succession.FindingsThe findings indicate that both selection and variation can take place through different routes during the pre…

THE VOLATILE OIL QUALITATIVE VARIATION IN THE UNDERGROUND ORGANS OF THE ANGELICA ARCHANGELICA L. FAMILIES DESCENDANTS

1970

Performance in Knowledge Assessment Tests from the Perspective of Linguistic Typology

2019

An important part of cross-linguistic variation manifests itself in the grammatical categories which are available in the grammar of a language, their semantic fine-grainedness and the obligatoriness of their use. The present paper will focus on three domains of grammar: (1) information structure and topicality, (2) converbs and clause combining and (3) modality and evidentiality. These domains are known to be prominent in Japanese and Korean grammar while they are clearly less relevant in English. The paper will first give a detailed account of these structures with examples from the US Test of Understanding in College Economics (TUCE). As will become quite clear, the versions of the test …

Knowledge Representation and Cognitive Skills in Problem Solving

2017

This paper offers a programmatic view on the study of cross-linguistic variation and its effects on human cognitive skills. Based on Linguistic Typology and its methodology to account for cross-linguistic differences (section 2), it will show how the presence or absence of certain grammatical categories enhances or inhibits specific skills in the domain of quantification (section 3). In its main part (section 4), it will show how to describe structural differences between the source and the target language in translation and how to find out if these differences affect the performance of students in knowledge assessment tests. For that purpose, it will compare the English and the Japanese ve…

Variation in Growth Response of Coastal Dune-Building Grass Species Ammophila Arenaria and Leymus Arenarius to Sand Burial

2020

AbstractAmmophila arenaria and Leymus arenarius are dune-building grass species native to European seacoasts. The present study aimed to compare growth responses to the sand burial of A. arenaria and L. arenarius from coastal habitats of the Baltic Sea, when the intensity of sand accretion was relatively low under controlled conditions. Plants were grown from seeds collected from natural coastal habitats, transplanted into individual containers, buried in the sand at different depths in the rapid shoot elongation stage, and further cultivated (11 or 9 weeks) in an automated greenhouse. Burial in sand significantly stimulated the growth of shoots of A. arenaria, the effect was earlier at hig…

Topological linguistics and the study of linguistic variation

1994

Publisher Summary This chapter focuses on topological linguistics and the study of linguistic variation. It discusses the problem of linguistic variation. A topological model has been developed for internal linguistics, starting from the epistemological problem that all linguists must deal with. A topological space could be conceived of as a set of elements where some elements limit the others and are said to be open-sets, and the former and the latter together constitute the closed-sets. Linguistics, when approaching its object of study, is faced with a very similar situation: a language is a set of elements—from utterances to minimal phonic items—where each is described by other surroundi…

Influence of the feed per tooth variation on the surface roughness at end milling of an aluminum alloy

2019

Abstract As a part of the cutting process, a researched aspect continuously is surface quality. Based on and using the results of previous research, the present scientific paper addresses the problem of the machined surfaces roughness. The cutting process approached in this study is the end-milling one, and the workpiece material used to carry out the study is the aluminum alloy used in the aerospace industry. The adopted cutting regime imply to keep the cutting speed at a constant value while the cutting parameters: cutting depth and feed per tooth vary with different values. The experimental research carried out by the authors in a prestigious industrial company is complicated and complie…