Eine verbesserte Anpassung von Südamerika an Afrika : Ergebnisse einer Rekonstruktion der ursprünglichen Form von Rift-Becken

A method for palinspastic reconstruction of rift basins is described here. It is based on the assumption of isostatic equilibrium and calculated from the present topography and sediment thickness in a rift basin. Passive continental margins along eastern South America and western Africa were moved landward from the ocean-continent boundary approximately 100 km. When South America is rotated to Africa, a tight fit with Africa results along the northern and central margins of South America. The southern part of South America was rotated to fit against Africa based on the palinspastic reconstruction of the San Jorge, Colorado and Salado marginal rift basins in Argentina. The method could also be applied to passive margins to calculate the total amount of crustal stretching that occurred during continental extension and rifting. The pre-rift condition of passive margins could then be calculated for more accurate initial fits between conjugate passive margins

The role of salinity in circulation of the Cretaceous ocean

The density of seawater is a complex function of temperature, salinity, and pressure. Because of the non-linearity of the equation of state of seawater, the densities of sea waters having the same temperature and the same salinity differences (with respect to the mean salinity of the ocean) will vary with the mean salinity of the ocean. Although this strange property of seawater is evident in a plot of the equation of state, it has never been considered in trying to reconstruct ancient ocean circulation. These differences in the density field may have caused the ocean to respond differently to atmospheric forcing in the past. The different response may hold the key to understanding "ocean anoxic events" and episodes of large-scale burial of organic carbon and production of petroleum source rocks

Non-Commutative Partial Matrix Convexity

Let $p$ be a polynomial in the non-commuting variables $(a,x)=(a_1,...,a_{g_a},x_1,...,x_{g_x})$. If $p$ is convex in the variables $x$, then $p$ has degree two in $x$ and moreover, $p$ has the form $p = L + \Lambda ^T \Lambda,$ where $L$ has degree at most one in $x$ and $\Lambda$ is a (column) vector which is linear in $x,$ so that $\Lambda^T\Lambda$ is a both sum of squares and homogeneous of degree two. Of course the converse is true also. Further results involving various convexity hypotheses on the $x$ and $a$ variables separately are presented.Comment: 24 page

Temperature and Malaria Trends in Highland East Africa

There has been considerable debate on the existence of trends in climate in the highlands of East Africa and hypotheses about their potential effect on the trends in malaria in the region. We apply a new robust trend test to mean temperature time series data from three editions of the University of East Anglia's Climatic Research Unit database (CRU TS) for several relevant locations. We find significant trends in the data extracted from newer editions of the database but not in the older version for periods ending in 1996. The trends in the newer data are even more significant when post-1996 data are added to the samples. We also test for trends in the data from the Kericho meteorological station prepared by Omumbo et al. We find no significant trend in the 1979-1995 period but a highly significant trend in the full 1979-2009 sample. However, although the malaria cases observed at Kericho, Kenya rose during a period of resurgent epidemics (1994-2002) they have since returned to a low level. A large assembly of parasite rate surveys from the region, stratified by altitude, show that this decrease in malaria prevalence is not limited to Kericho

Traumatic brain injury rehabilitation: an overview of systematic reviews of intervention effectiveness. A pre-published protocol

INTRODUCTION. Many authors are in favour of using systematic reviews as a method for evidence synthesis in rehabilitation and the last decade has introduced several guidelines to help with their implementation in rehabilitation contexts. At present, however, there is little clear information about the quantity and quality of systematic reviews on TBI rehabilitation interventions. AIM. We aim to conduct an overview of systematic reviews published on TBI rehabilitation interventions in order to summarise the current state of evidence in this area of clinical practice. In addition to providing information on strength of evidence for intervention effectiveness, our goal is to research and summarise two additional domains: reviews’ characteristics and evidence gaps. METHODS. We will carry out a comprehensive search of the Cochrane Library database (including Database of Abstracts and Reviews of Effectiveness) MEDLINE, CINAHL, EMBASE, Epistemonikos, PDQ-evidence, and PubMed to find relevant systematic reviews. We also will make efforts to identify ongoing reviews by searching for protocols in the Cochrane Library database and in PROSPERO. We are not going to search grey literature. We will use Covidence (https://www.covidence.org/home) to manage review selection. Two review team members will independently select the reviews to be included to the overview. A third researcher will be consulted for resolving disagreements. We will use Knack software (https://www.knack.com/), to extract data on review characteristics and review findings. We will include the systematic reviews on the adult TBI population (regardless of severity, stage of recovery, or other aspects of clinical presentation), any kind of rehabilitation interventions (regardless of setting, uni- or multidisciplinarity etc) to describe review characteristics. From those systematic reviews the ones with comparisons with no treatment, placebo or sham treatment, and usual care; and with outcomes such as quality of life, activity and participation – as per International Classification of Functioning, Disability & Health –residential status, family burden, and adverse effects will provide basis for intervention effectiveness analysis. We will assess the quality of reporting with updated PRISMA (Transparent Reporting of Systematic Reviews and Meta-Analysis) by making a judgement of “yes/no/unclear” without further descriptions. We will assess the methodological quality of included reviews with AMSTAR 2 (A Measurement Tool to Assess Systematic Reviews) instrument. SYNTHESIS. We will provide a report on the characteristics of all included reviews using simple statistical analyses and narrative accounts and the main summary of results based on intervention effectiveness. Also, we aim to present conclusions specific to each intervention in terms of the current evidence base: statistical and/or narrative descriptions of effects and the evidence quality, relevant contextual factors, population, rehabilitation setting, and comparisons researched. We will not perform meta-analysis. In order to example gaps in the current evidence of TBI rehabilitation, we will separately summarise the information on ICF categorizations covered with low or very-low quality evidence or no evidence at all from existing systematic reviews. CONCLUSIONS. To support knowledge translation, we will organise the overview of reviews’ findings as comprehensive evidence maps

Global data for ecology and epidemiology: a novel algorithm for temporal Fourier processing MODIS data

Background. Remotely-sensed environmental data from earth-orbiting satellites are increasingly used to model the distribution and abundance of both plant and animal species, especially those of economic or conservation importance. Time series of data from the MODerate-resolution Imaging Spectroradiometer (MODIS) sensors on-board NASA's Terra and Aqua satellites offer the potential to capture environmental thermal and vegetation seasonality, through temporal Fourier analysis, more accurately than was previously possible using the NOAA Advanced Very High Resolution Radiometer (AVHRR) sensor data. MODIS data are composited over 8- or 16-day time intervals that pose unique problems for temporal Fourier analysis. Applying standard techniques to MODIS data can introduce errors of up to 30% in the estimation of the amplitudes and phases of the Fourier harmonics. Methodology/Principal Findings. We present a novel spline-based algorithm that overcomes the processing problems of composited MODIS data. The algorithm is tested on artificial data generated using randomly selected values of both amplitudes and phases, and provides an accurate estimate of the input variables under all conditions. The algorithm was then applied to produce layers that capture the seasonality in MODIS data for the period from 2001 to 2005. Conclusions/Significance. Global temporal Fourier processed images of 1 km MODIS data for Middle Infrared Reflectance, day- and night-time Land Surface Temperature (LST), Normalised Difference Vegetation Index (NDVI), and Enhanced Vegetation Index (EVI) are presented for ecological and epidemiological applications. The finer spatial and temporal resolution, combined with the greater geolocational and spectral accuracy of the MODIS instruments, compared with previous multi-temporal data sets, mean that these data may be used with greater confidence in species' distribution modelling

Alternative global Cretaceous paleogeography

Plate tectonic reconstructions for the Cretaceous have assumed that the major continental blocks—Eurasia, Greenland, North America, South America, Africa, India, Australia, and Antarctica—had separated from one another by the end of the Early Cretaceous, and that deep ocean passages connected the Pacific, Tethyan, Atlantic, and Indian Ocean basins. North America, Eurasia, and Africa were crossed by shallow meridional seaways. This classic view of Cretaceous paleogeography may be incorrect. The revised view of the Early Cretaceous is one of three large continental blocks— North America–Eurasia, South America–Antarctica-India-Madagascar-Australia; and Africa—with large contiguous land areas surrounded by shallow epicontinental seas. There was a large open Pacific basin, a wide eastern Tethys, and a circum- African Seaway extending from the western Tethys (“Mediterranean”) region through the North and South Atlantic into the juvenile Indian Ocean between Madagascar-India and Africa. During the Early Cretaceous the deep passage from the Central Atlantic to the Pacific was blocked by blocks of northern Central America and by the Caribbean plate. There were no deep-water passages to the Arctic. Until the Late Cretaceous the Atlantic-Indian Ocean complex was a long, narrow, sinuous ocean basin extending off the Tethys and around Africa. Deep passages connecting the western Tethys with the Central Atlantic, the Central Atlantic with the Pacific, and the South Atlantic with the developing Indian Ocean appeared in the Late Cretaceous. There were many island land areas surrounded by shallow epicontinental seas at high sea-level stands

Results of a climate model for Triassic Pangaea

We have used a new General Circulation Model, GENESIS Version 1.02, derived from the U. S. National Center for Atmospheric Research Community Climate Model I (NCAR-CCM I) to simulate the climate of an Earth with realistic Pangaean geography. The climate model was run assuming that the ocean heat flux was similar to that of today, atmospheric C02 content was four times that of today, the solar constant was 2 % less than today, and the Earth's orbit was circular, with mean obliquity 23.4°. Models were run for paleogeographies at 245 Ma (Scythian) and 225 Ma (Carnian). The results indicate that no ice cap would develop over the land, and there is no permanent sea ice. The seasonal temperature Variation in the interior of the continent is in the order of 50 °C. The Continental areas are very dry except for a few Coastal areas and along uplifts. The models both suggest an extreme seasonal monsoonal circulation, with strong westerly winds parallel to the entire coast of Gondwana and the east coast of Laurasia during the northern hemisphere summet. In both hemispheres, the effect is to cause coastal upwelling. The model also predicts permafrost in the deeper soil layers poleward of 50° N and S. The effects of topographic uplifts on the atmospheric circulation are pervasive. Topography strongly affects the monsoonal circulation causing major deviations of the wind Systems suggested in model runs with idealized geographies. Topography also plays a crucial role in concentrating rainfall in a few small areas. It is evident that in order to have a realistic Simulation of paleoclimate, an accurate representation of the paleotopography is essential. It is also evident that the paleoclimate models may be useful in suggesting geological criteria that can confirm or reject the predicted paleoclimatic conditions

The reflective learning continuum: reflecting on reflection

The importance of reflection to marketing educators is increasingly recognized. However, there is a lack of empirical research which considers reflection within the context of both the marketing and general business education literature. This paper describes the use of an instrument which can be used to measure four identified levels of a reflection hierarchy: habitual action, understanding, reflection and intensive reflection and two conditions for reflection: instructor to student interaction and student to student interaction. Further we demonstrate the importance of reflective learning in predicting graduates’ perception of program quality. Although the focus was on assessment of MBA level curricula, the findings have great importance to marketing education and educators