The use of large numbers of variables to measure the shape of a restricted area of bone

A series of 28 “depth” measurements, from a fixed plane to a bone surface (the frontal bone of the human skull), is presumed to contain information about shape. Data are presented for three groups of skulls and a few problematic single ones. A simple method for reducing the 28 measurements to a few shape contrasts is described. Reasons why the data are unsuitable for a canonical analysis are discussed and possible problems arising from the uncritical use of canonical analysis in general are pointed out. Some general comments are made as to the relative morphological affinities of the comparative groups selected, and especially the single more controversial specimens.     

Evaluation of the Poisson Approximation To Measures of the Random Pattern in the Square

Theoretical values for spacing between points of the Poisson process are frequently used to evaluate the hypothesis that the locations within a region of pointlike objects have a random pattern. These theoretical spacing values are an approximation to spacing values for a uniform process in which the objects are uniformly and independently located in the region. The adequacy of the Poisson approximation to this uniform process for a square region is evaluated by analytic and numeric methods. The approximation is close for a small number of points when spacing between objects is measured by toroidal distance.     

A biometric technique for assessing prehistoric freshwater mussel population dynamics (family: Unionidae) in north Texas

Biometry is useful for a suite of analyses relevant to zooarchaeology, which include analysis of mortality profiles, taphonomy, paleoecology, among other purposes. Here, size-age prediction models are developed for 10 freshwater mussel species found in north Texas to develop a method for studying paleoenvironmental conditions. Shell length is often used to evaluate the structures of modern mussel populations, but its use on paleozoological specimens is not feasible because complete shells rarely preserve. Instead, pallial line-to-lateral teeth length (PLL) and pseudocardinal teeth-to-pallial line length (PSP) are evaluated as proxy measures for shell length. Linear regression models based on PLL and PSP using modern mussels demonstrate that they are accurate proxies of shell length for multiple species from a variety of habitats. In addition, ontogenetic-age structures for a modern sample and for two late Holocene assemblages from north Texas are developed using PLL and PSP. These techniques are useful tools for evaluating past ecological conditions of freshwater mussel populations when large samples are available for study, which expands analytical potential of zooarchaeological studies of prehistoric unionid remains.     

Linking polycentricity concepts to periphery: implications for an integrative Austrian strategic spatial planning practice

This contribution searches for a regional planning conception that allows for a mutual recognition and practical translation between strategies for urban regions and peripheries beyond separate urban and rural categories; taking the Austrian strategic spatial planning context as the example. For this, various notions of polycentricity are discussed and assessed with regard to periphery. The Austrian strategic spatial development concept ÖREK sets out a focused work programme with changing responsibilities and participation of actors. The objectives are targeted and the processes are implementation oriented. Amongst other topics, urban regional issues and peripheral, declining regions are worked on separately. A conceptually integrative, plan-like strategic instrument across the topics and for the whole of Austria is lacking. The ESPON notion of ‘inner peripheries’ is proposed as a complementary concept to the ESDP notion of polycentricity, helping to create a bridge between urban regional and periphery strategies. This has the potential to guide strategic planning practice efforts in Austria towards a yet missing strategic spatial plan for the whole of the country beyond urban and rural categories. Practice relevant conclusions related to the case of Austrian strategic spatial planning are drawn and a need for further, comparative research in a European context is identified.     

Computer analysis of an inconsistent data source: the case of probate inventories

Computers are becoming increasingly popular for analysing data in historical geography and are being applied to an extending range and variety of historical sources. The methods described in most computer texts for geographers and historians, using the langueage allied to punched cards, are only suitable for numeric data which are in a standardized and consistent form. Rather than attempting to apply these methods to sources not organized in this way, it is more sensible to tailor a technique to a particular class of data.This paper considers some advantages of computer analysis, using English probate inventories as an example. Limitations of conventional methods are discussed and a technique is described for dealing with sources whose information is inconsistent between records. The method relates the logical structure of inventories to the storage and use of data by the computer, and considers the forms data can take for input to the machine. An example from the analysis of inventory data prepared by this method is briefly presented, describing two aspects of agricultural change in East Anglia between 1580 and 1740.     

Extraction of Hierarchical Surface Networks from Bilinear Surface Patches

Surface networks capture the topological relations between passes of a continuous surface, the paths of steepest descent and ascent starting at the passes, and the pits and peaks where the steepest paths end. Surface networks represent the topology of surfaces in a compressed form and allow fast investigation of the surfaces' convex and concave shapes. They are applied, for instance, for enhancing algorithms for surface analysis, for surface model simplification, and for surfaces visualization. Furthermore, they are themselves subjects of analysis as they are closely coupled to the intrinsic geometrical concepts and rules of continuous surfaces.
This article extends the topology of surface networks in four ways: (i) objects at the edge of the surface model are introduced; (ii) intersections between valley and ridge lines are found to be possible, and such intersections are incorporated into the topology; (iii) horizontal areas may represent passes, pits, or peaks, and therefore must be detected and explicitly incorporated; and (iv) valley and ridge line hierarchies are recognized as inherent components of the surface network. They are extracted and explicitly represented.
To ensure consistency and completeness of the surface network, a zero-order continuous surface is specified from the raster data prior to the extraction. This article presents a method to represent and derive valley and ridge line hierarchies. The results are illustrated with two examples. The extracted networks are found to be consistent and complete. However, the extraction method tends to produce spurious pits, peaks, and passes, which form a drawback if the surface data are affected by noise.     

THE IMPACT OF MIXED LAND USE ON RESIDENTIAL PROPERTY VALUES*

ABSTRACT Contemporary European urban planning policies aim to mix land uses in compact neighborhoods. It is presumed that mixing land uses yields socioeconomic benefits and therefore has a positive effect on housing values. In this paper, we investigate the impact of mixed land use on housing values using semiparametric estimation techniques. We demonstrate that a diverse neighborhood is positively valued by households. There are various land use types that have a positive impact on house prices, e.g., business services and leisure. Land uses that are incompatible with residential land use are, among others, manufacturing and wholesale. It appears that households are willing to pay about 2.5 percent more for a house in a mixed neighborhood. We also show that there is substantial heterogeneity in willingness to pay for mixed land use. For example, only apartment occupiers are willing to pay for an increase in diversity, whereas households living in other house types are not willing to pay for diversity.     

When Studies Collide*

Environmental epidemiology increasingly is being used as a foundation for environmental health policy. Since environmental epidemiologic studies have increased dramatically in number, approaches are needed to interpret them. Two approaches used in epidemiology are rules of evidence and meta-analysis. Rules of evidence pertain to the consistency, strength, uniqueness, and medical basis of the relationship between disease and risk factors such as chemicals. Meta-analysis is a systematic and rigorous approach to comparing studies and understanding their heterogeneity. Dioxins, benzene, and formaldehyde are three chemicals that are at the forefront of health policy debates. These chemicals illustrate some of the conditions under which researchers are drawn or are not drawn to approaches to compare studies. A meta-analysis was not conducted for dioxins or benzene, but was conducted for formaldehyde. Rather than addressing study comparisons, epidemiologic studies of dioxins are focusing on expanding the number of health effects studied and obtaining greater specificity for exposures, whereas studies of benzene are focusing on effects at low dose exposures. In the case of formaldehyde, meta-analysis has strengthened the evidence for some health effects beyond what individual studies could provide. Thus, whether rules of evidence and meta-analysis approaches to synthesizing information are used can depend upon where the debates are focused.     

Knowledge Externalities and Knowledge Spillovers in Social Networks: The Case of Izmir Metalwork Industrial District

Social networks are the networks based on relationships between social entities. Since social interactions are directly associated with externalities, these relationships are assumed to create opportunities for the network members by providing especially knowledge flows. In this context, the main objective of this study is to show the role of knowledge externalities in social networks. By following this aim, some theoretical derivations are delivered and survey results in a small-world network are explained. Consequently, after a brief introduction, the first section of this study consists of a theoretical model derived by including knowledge externalities in social networks. In the second section, a survey applied in Izmir Metalwork Industrial District is explained. Finally, in the third section, survey results are presented and then conclusions and discussions for further research are revealed. Contributions of this study to the related literature are three-fold. Firstly, knowledge externalities are added to the models of knowledge flows in social networks explicitly. Secondly, a questionnaire trying to measure knowledge spillovers and knowledge externalities separately is introduced and applied for the first time in the literature. Finally, such an analysis is the first for Izmir which is the third metropolitan city of Turkey.     

SPATIAL PRICING IN INTERDEPENDENT MARHETS*

ABSTRACT. Conditions for spatial price equilibrium are derived for a set of firms in oligopolistic spatial competition, distributed at fixed locations in a heterogeneous region where consumer purchasing patterns are a probabilistic function of the price distribution rather than a deterministic function of proximity to firms. The resulting prices vary with accessibility to consumers or with the degree of local spatial monopoly, and result in non-zero profits for firms. Conditions describing the existence and stability properties of this spatial price equilibrium are defined, and are shown to be equivalent for two different hypotheses concerning disequilibrium pricing behavior: a partial price adjustment model and a Bertrand game. For two different profit goals, total profit maximization and profit rate maximization, it is shown that a spatial price equilibrium exists and is at least locally quasi-stable.     

Working,Shopping, and House Rents

The interaction between household demand for goods and for leisure and the supply of labor at various distances from an urban center is investigated for the case where rents are endogenous and adjust to equalize differences in utility produced by the greater time and money costs of the journey to shop and the journey to work. The model is solved for a set of realistic parameter values and this confirms that when rents are equal everywhere the demand for leisure can increase and the supply of labor decrease for households nearer the center, while once rents are endogenous the reverse must be true. For a household at a given location the elasticities of demand for goods and leisure and the elasticity of labor supply are calculated for all the parameters of the model. It is shown that the unavoidable costs of travel to work have strong effects on the rent gradient while the costs of the journey to shop have only weak effects, being offset by the variable frequency of shopping.     

New Estimates of Gravitational Attraction by Linear Programming

This paper uses data for intercity air-passenger travel to derive a set of general propulsion and attraction factors for twenty-five large U.S. cities. The paper develops a new way of examining the linkages between flows and nodal attraction. The technique is to assume that the flow data fit a simple gravity model, and then linear programming is used to maximize the consistency of the endogenous propulsion and attraction with the flow data. Various linear models are used to determine the pattern of urban attraction factors that are consistent with the gravitational flows. Linear programming as well as goal programming models are used to develop a set of analyses linking flows to urban hierarchies. Suggestions for further extensions of the method to address substantive issues of urban systems analysis are also provided.     

How should tourism education values be transformed after 2020?

Abstract

Values and axiology are necessary components for successful and meaningful tourism education and research. They especially need to be revisited in considering the future of higher education in a COVID-19 world. If transformation means to bring about a substantial change in a positive direction, then the COVID-19 pandemic might be a blessing in disguise for tourism higher education, as a substantial change has been due for quite some time. The transformative powers that education offers are seen in the individual through the internal and external transformations of learners. Higher education holds the promise of transforming society, but it is widely criticized for being too enmeshed in neoliberal values, which weakens it ability to productively equip students with capacities to transform the society they are entering. Education, both generally and more specifically tied to tourism higher education, requires a stronger awareness of lived values and aspirational values to transform how education is carried out. These include, for example, an emphasis on wellbeing indicators over revenue and tourist arrival numbers. All humans act and plan for their futures according to their lived values, but such values are hardly ever overtly acknowledged in research or in daily parlance. The COVID-19 pandemic is stirring up a new search for these lived values in a context where past formulas are failing on a global scale.     

Spatial Search for the Lowest Price

Search for low prices often requires that individuals make decisions not only about the optimal amount of search, but also about the optimal route to be taken through a set of known locations. In this paper, the fixed sample size strategy used in economic models of search is extended to account for the travel costs that are incurred as alternatives are examined. Analytical results for the optimal amount of search are given, and alternative routing algorithms for a modified version of the traveling-salesman problem are evaluated.     

Virtual skeletons: using a structured light scanner to create a 3D faunal comparative collection

Appropriate comparative animal skeletons are not always available to faunal analysts for use in identifying archaeofaunal remains. This is especially pertinent when working in locations where no comparative collections are available locally, and the archaeological assemblage cannot be transported to another facility. In order to fill this gap, we are building a virtual comparative faunal collection using a structured light scanner to scan modern skeletal material in 3D. The resulting high resolution 3D color models are a valuable resource for identifying fossil specimens. Scan data can be converted into a variety of formats for viewing and can be transported on a portable digital device for use at field or laboratory localities. In addition, scans can be printed three dimensionally to produce a replica of the scanned skeletal part. A particular advantage of this digital technology is that we can eventually create a complete 3D representation of a taxon's skeleton from scans of several components of what are incomplete skeletons of one animal taxon in a museum collection. The results of our project thus far are available to other researchers and educators by means of the internet. A variety of interested parties could benefit from such a collection, including zooarchaeologists, paleontologists, biologists, teachers and museum curators.     

The Solar Power Satellite – Progress So Far

Abstract

Energy supply and demand issues are explored and a rationale is presented for increasing reliance on the inexhaustible energy radiated by the Sun. The potential of solar energy to meet global energy needs is surveyed and the objectives for solar energy conversion in space for use on Earth are given. The concept of the solar power satellite, SPS, is introduced, and its advantages for the generation of continuous power compared with terrestrial solar energy conversion methods, are discussed. The technology options for converting solar energy in space, transmitting power, and converting it on Earth into electricity, are summarized. The requirements for space transportation systems, orbital assembly and maintenance are reviewed. The economic, environmental and societal issues inherent in the development and future implementation of the SPS concept, are highlighted. Possible organizational structures which would permit international participation in an SPS program, are presented. The conclusion is drawn that assessment of the technical, economic, environmental, and societal issues has not identified a single constraint which would preclude continuation of the SPS R+D program. This program could lead to a future decision to implement this major option for power generation on Earth. Comments on the National Research Council's report on the SPS are included.     

EVALUATION OF CONVENTIONAL AND ADAPTIVE PUSHOVER ANALYSIS I: METHODOLOGY

In this paper, a methodology is suggested and tested for evaluating the relative performance of conventional and adaptive pushover methods for seismic response assessment. The basis of the evaluation procedure is a quantitative measure for the difference in response between these methods and inelastic dynamic analysis which is deemed to be the most accurate. Various structural levels of evaluation and different incremental representations for dynamic analysis are also suggested. This method is applied on a set of eight different reinforced concrete structural systems subjected to various strong motion records. Sample results are presented and discussed while the full results are presented alongside conclusions and recommendations, in a companion paper.     

Working with the Community: Improving the learning experience for large classes

The need for students to develop skills that are of use in the wider labour market, as well as those specifically related to their degree subjects, has been widely accepted for a considerable period of time. It has also been noted that unless these skills are practised and are contextualised they tend neither to be learned, except at the most superficial level, nor transferred to other situations where their use would be appropriate. This paper reports the use of projects extending over a number of sessions, involving working with local community groups, carried out within a discrete module specifically designed to facilitate the learning and practice of both geographical and transferable skills. The problems of providing an integrated approach to the learning of skills for a large group of students, with limited resources and in the context of timetable restrictions imposed by a two-subject degree structure, are addressed. The degree of learning perceived by the students is evaluated and suggestions are made for further development of this approach.     

Development of Collaborative Structure Analysis (CSA) System and Its Application to Investigate Effects of Soil-Structure Interaction

In this article, a collaborative structure analysis (CSA) system is developed for integrating different finite-element simulation programs. In this system, a simulated structure is divided into multiple substructures, and the interaction between the substructures is considered. Interfaces for the commercial finite-element program ABAQUS and for an open-source framework for structure analysis, OpenSees, are developed to achieve CSA integration. The CSA system is applied to analysis of a soil-structure interaction (SSI) problem, and the effects of SSI are investigated, and the efficiency and accuracy of the system are demonstrated.