Gravity-Type Interactive Markov Models—Part I: A Programming Formulation of Steady States

An important class of interactive Markov migration models is characterized by gravity-type transition kernels, in which migration flows in each time period are postulated to vary inversely with some symmetric measure of migration costs and directly with some population-dependent measure of attractiveness. This two-part study analyzes the uniqueness and stability properties of steady states for such processes. In this first part, it is shown that a flow version of the steady-state problem can be given a programming formulation which permits global analysis of steady-state behavior. Within this programming framework, it is shown that when attractiveness is diminished by increased population congestion, the steady states for such processes are unique. The second part of the study will employ these results to analyze the stability properties of such steady states.     

The diary of William MacEwan: Part II

This instalment of the Diary describes the first stage of the journey from Quilimane to the interior, then the most convenient and practicable way to the British territory of Nyasaland, and the way by which both people and goods entered and left that country. This is all changed ; the route has been abandoned by the African Lakes Corporation, and Maruru, the first place where the Diarist saw African village life, probably no longer exists. When the Diary is completed, it is hoped to publish an article describing the country MacEwan saw as it is at the present day. Much has been done to improve the condition of the natives under British rule since then, but it is more difficult to ascertain their condition under the Portuguese ; much more, however, remains to be done. Transport, of course, has been improved out of all comparison, and it will be interesting to compare it with the means by which MacEwan entered the then Darkest Africa—improvement which has taken place well within a single lifetime.     

PGM VI: A Lost Part of PGM II

The following paper is a paleographical study of PGM VI (P. Lond. I 47) and PGM II (P. Berol. inv. 5026) aiming to demonstrate that they belong to the same roll and contain the same magical text.     

Integrated Visions (Part II): Envisioning Sustainable Energy Landscapes

Climate change and resource depletion are driving the transition to renewable energy sources. Both the supply of renewables and the demand for energy are influenced by the physical environment and therefore concern spatial planning and landscape design. Envisioning the long-term development of alternative energy landscapes – that is sustainable energy landscapes – present spatial planners and landscape architects with new challenges. The first paper of this two-part series discussed several existing approaches to long-term regional planning and landscape design, and presented an alternative, five-step approach for the composition of integrated visions [Stremke, S., Kann, F. Van & Koh, J. (2012) Integrated Visions (part I): Methodological Framework, European Planning Studies, [20(2), pp. 305–320]. This paper illustrates how the five-step approach was employed to compose a set of integrated visions for the development of sustainable energy landscapes in south of the Netherlands. The proposed five-step approach is then examined with respect to a set of criteria stressed in the planning and design literature.     

CHARMed PyMca,Part II: An evaluation of interlaboratory reproducibility for ED‐XRF analysis of copper alloys

CHARMed PyMca is a protocol for researchers using energy‐dispersive X‐ray fluorescence spectroscopy (ED‐XRF) who wish to maximize interlaboratory reproducibility of quantitative results from copper alloys found in heritage materials. This paper reports the results of a study evaluating the interlaboratory reproducibility expected when following this protocol. Five institutions participated in this study, using nine tube‐based instruments of seven types. A set of 12 reference materials not used for calibration was analysed according to the protocol. The results show an improvement in reproducibility of between 65% and 83%, depending on the element, in comparison with a similar study carried out in 2010. The protocol allowed the consistent reporting of concentrations for 15 elements, in contrast to only eight elements that were reported in the 2010 study. Finally, the protocol was shown to generate accurate quantitative results with a well‐characterized precision. It is hoped the information presented here can help researchers studying heritage copper alloys to collaborate more effectively and with greater confidence in the reproducibility of their results. It should also aid researchers to make realistic and informed decisions about whether or not the degree of reproducibility that they may expect from ED‐XRF makes the protocol suitable for their specific purposes.     

The Cognitive Function of Music. Part II

Abstract

Ancient and contemporary theories of the cognitive functions of music are reviewed and compared with the hypothesis (advanced in Part I) that music performs a fundamental cognitive function, helping to maintain psychic balance in the face of the diversity of the world. Considering historical evidence of the evolution of cultures and consciousness, a parallel evolution of music as a powerful and unifying emotional mechanism is demonstrated and recent cognitive experiments that have confirmed this hypothesis are summarized. The neural mechanisms of music include mental representations which unify the entire life experience. It follows that music is fundamental in making human evolution possible. The human mind and our human cultures would not exist as they do today without music. Future theoretical and experimental research directions are outlined.     

Confidence in Political Institutions in Canada and the United States: Assessing the Interactive Role of Region and Race

This article uses nationally representative sample survey data to assess the confidence of Canadians and Americans in four major state institutions: the police; the civil service; the federal government; and political parties. Long-standing arguments suggest that Canadians are more trusting of government than Americans. Results, however, indicate small national differences, with variations within countries being much more important, especially for regional and racial subgroups within each nation. Consistent with their traditional minority position in Canada, Quebecers stand out as having the least confidence of respondents in either nation. In contrast, and despite their minority position, nonwhites express more confidence in political institutions than do whites in both countries, especially in English Canada. One exception is somewhat lower confidence in the police among nonwhites, particularly in the northern United States. The findings demonstrate the need to go beyond an exclusive focus on national differences when comparing political attitudes and values in Canada and the United States.     

Localization and William Macewen's early brain surgery Part II: The cases

This paper contains Part II of an evaluation of the claims made for the priority of Macewen's pre-1884 brain surgery over that of Bennett and Godlee. Although the primary sources--Macewen's Private Journals and the Ward Records of the Glasgow Royal Infirmary--confirm that the operations were carried out when Macewen said they were, problems with the sources make it difficult to evaluate the extent to which he actually used knowledge of localization bearing on the claim for his priority evaluated. Part II concludes with citations from archival correspondence and the contemporary and near contemporary medical press confirming Macewen's priority.     

The Implications of Policy Stability for Renewable Energy Innovation in the United States, 1974–2009

Government support and commitment are of particular importance for renewable energy technology innovation activities, which are highly contingent on policy and market uncertainty. The research focus of this article is to examine the relationship between policy stability in public resource allocation and policy outcomes in renewable energy technologies. With time‐series cross‐sectional analyses, we test effects of both the stability and magnitude of federal R&D expenditures on patent applications in five renewable energy sectors (i.e., solar, wind, hydropower, geothermal, and bioenergy) from 1974 to 2009. The findings show that technology innovation is affected by both the magnitude and stability of government financial commitment. Nevertheless, when industries perceive government support over longer time frames, the magnitude effect loses explanatory power to the stability effect. In addition to federal R&D expenditures, policies pertaining to technology commercialization and marketization are a critical determinant of innovation activities. This study demonstrates that incremental, predictable, and credible expenditures facilitate renewable energy technology development. Conversely, a boom‐bust cycle of resource support fails to translate policy goals into intended results.     

International Trade Fairs and Global Buzz. Part II: Practices of Global Buzz

International trade fairs bring together agents from all over the world for a limited time period. They create a dense ecology of communication and information flows, referred to as “global buzz”. Global buzz associated with face-to-face (F2F) communication is extremely important for agents participating in these events as it generates access to developments occurring in different parts of the world. It helps to maintain and intensify existing networks, establish new networks or “trans-local pipelines” and support the development of shared attitudes and understandings. This paper aims to provide empirical evidence about the significance of global buzz in its manifold forms. Our research emphasizes the benefits that result from four sets of closely interrelated practices: (i) global knowledge exchange based on F2F interaction, (ii) exploration of market trends, (iii) problem solving and idea generation and (iv) network generation and pipeline-building in interpretative communities. The paper argues that practices of acquiring information, networking and dealing with competition differ substantially according to industry, firm and product characteristics. Our analysis of global buzz practices draws from more than 460 semi-structured interviews, which were conducted between 2004 and 2006 at seven national and international trade fairs in Frankfurt/Main, Hannover and Nürnberg, Germany.