Superdiversity and cities: Technical report

This report describes the materials incorporated into the original Superdiversity visualization website (www.superdiv.mmg.mpg.de), launched late in 2018. This includes the sources of data, the properties of the variables and categories used to produce the website, and the design principles and methods used in the visualizations presented on the website

Urban markets and diversity: Toward a research agenda

In this paper we advocate the study of local street markets to explore fundamental issues about the relationship between economy and society. This relationship evolves over time and we believe that it has been recast in an age of increasing cultural diversity and neoliberal state regulatory structures. In street markets we can see how diversity and the nature of economic transactions become mutually constitutive. We argue that cultural diversity propels local markets, while everyday interactions in markets influence intercultural relationships. These complex processes are affected by the spatiality of markets and the regulatory environments within which they operate. We conclude by framing a research program on street markets and discuss a number of methodological complications that would need to be addressed in this endeavour

Visualizing superdiversity and “seeing” urban socio-economic complexity.

Recent migration has made traditional destination cities so diversethat many conventional social science concepts and methods havebecome inadequate to the task of understanding complex diversity,or what is now often termed superdiversity. Here, we address theneed for new methods of "seeing" urban superdiversity in twoways. First, we highlight the need to understand urban contextsby examining new combinations and intersections of multiplesocial variables. Second, we demonstrate a suite of newinteractive tools. We attempt to enable users to picture, perceiveand apprehend complex analyses of multidimensional data onurban diversity in new, more intuitive ways. This visualizationdraws on multivariate geo-spatial data on different kinds ofdiversity, across three major destination cities: Sydney, Vancouver,and Auckland. We believe this approach contributes to thetheoretical and methodological refinements needed to studycontemporary superdiversity in urban settings, and to contributeto better public understanding and policies regarding theprocesses of urban diversificatio

Ferromagnetic resonance in systems with competing uniaxial and cubic anisotropies

We develop a model for ferromagnetic resonance in systems with competing uniaxial and cubic anisotropies. This model applies to (i) magnetic materials with both uniaxial and cubic anisotropies, and (ii) magnetic nanoparticles with effective core and surface anisotropies; We numerically compute the resonance frequency as a function of the field and the resonance field as a function of the direction of the applied field for an arbitrary ratio of cubic-to-uniaxial anisotropy. We also provide some approximate analytical expressions in the case of weak cubic anisotropy. We propose a method that uses these expressions for estimating the uniaxial and cubic anisotropy constants, and for determining the relative orientation of the cubic anisotropy axes with respect to the crystal principle axes. This method is applicable to the analysis of experimental data of resonance type measurements for which we give a worked example of an iron thin film with mixed anisotropy.Comment: 7 pages, 3 figure

Cattail Invasion of Sedge Meadows Following Hydrologic Disturbance in the Cowles Bog Wetland Complex, Indiana Dunes National Lakeshore

The vegetation of the 80.7 hectare Cowles Bog Wetland Complex has been altered from its historic mixed sedge-grass domination (Carex stricta, Calamagrostis canadensis) in lower areas and woody growth in slightly elevated areas , as based on archival aerial photographs from 1938-1982 and recent field data. Cattails (Typha spp.) were present in 1938 and made minor gains in cover through 1970. However, the major invasion of cattails appears to be associated with stabilized, increased water levels caused by seepage from diked ponds constructed upgradient from the wetland in the early 1970s. The water level increases are assumed to have been of a magnitude which adversely affected the sedge-grass community but did not preclude cattail growth. The cattail vegetation type increased in cover from 2.0 ha in 1938 to 9.7 ha in 1970 to 37.5 ha in 1982. The sedge-grass vegetation type correspondingly decreased from 56.4 ha to 43.0 ha to 5.7 ha. Cattail invasion appears to have occurred through establishment of disjunct colonies by seed reproduction; followed by vegetative expansion and merging of the colonies

Vegetation Patterns in and among Pannes (Calcareous Intradunal Ponds) at the Indiana Dunes National Lakeshore, Indiana

The relationships between plant species composition and dispersion, water chemistry and water depth/depth to water table were studied in five calcareous intradunal ponds (pannes) bordering the southern tip of Lake Michigan. The panne systems contained eight plant species threatened and endangered in Indiana. The aquatic zone was dominated by Chara, the pond edge by Rhynchospora capillacea, Juncus balticus and Utricularia cornuta, and the area surrounding the pond by Hypericum kalmianum. The water chemistry was typical of hardwater ponds in the area, probably affecting species composition but not species dispersion within the pannes. A significant correlation between the first axis scores from a reciprocal-averaging ordination and water depth/depth to water was demonstrated. Panne species are fitted to a model based on hydrology proposed by van der Laan for dune-slack vegetation in the Netherlands