1,196 research outputs found
Climate Crisis and Youth: Vocal Representatives of the Climate Discourse
Climate change and environmental questions have dominated the media agenda for almost forty years now. Besides the academic circles, these issues appear in political discourses and in the public sphere. From a social perspective, it is the now young generation mostly discussed in connection with the possible effects of climate change. It is often highlighted that Generation Z will be the cohort who will have to face the consequences of environmental destruction. There are several youth-led movements that appeared during the past five years: these are strikingly similar, go viral within a very short time and besides that they are professional both in their rhetoric and marketing. However, the majority of scientific research features only the positive effects these movements, there is often no information provided about who is behind them. The rapidly growing body of research is disproportionate in terms of geographical location, ethnicity, sex and social class of the participants, which raises important questions
Interaction of confining vortices in SU(2) lattice gauge theory
Center projection of SU(2) lattice gauge theory allows to isolate magnetic
vortices as confining configurations. The vortex density scales according to
the renormalization group, implying that the vortices are physical objects
rather than lattice artifacts. Here, the binary correlations between points at
which vortices pierce a given plane are investigated. We find an attractive
interaction between the vortices. The correlations show the correct scaling
behavior and are therefore physical. The range of the interaction is found to
be (0.4 +/- 0.2) fm, which should be compared with the average planar vortex
density of approximately 2 vortices/fm^2. We comment on the implications of
these results for recent discussions of the Casimir scaling behavior of higher
dimensional representation Wilson loops in the vortex confinement picture.Comment: 9 pages LaTeX, 2 ps figures included via eps
Spatiotemporal Assessment of Vegetation Indices and Land Cover for Erbil City and Its Surrounding Using Modis Imageries
The rate of global urbanization is exponentially increasing and reducing areas of natural vegetation. Remote sensing can determine spatiotemporal changes in vegetation and urban land cover. The aim of this work is to assess spatiotemporal variations of two vegetation indices (VI), the Normalized Difference Vegetation Index (NDVI) and Enhanced Vegetation Index (EVI), in addition land cover in and around Erbil city area between the years 2000 and 2015. MODIS satellite imagery and GIS techniques were used to determine the impact of urbanization on the surrounding quasi-natural vegetation cover. Annual mean vegetation indices were used to determine the presence of a spatiotemporal trend, including a visual interpretation of time-series MODIS VI imagery. Dynamics of vegetation gain or loss were also evaluated through the study of land cover type changes, to determine the impact of increasing urbanization on the surrounding areas of the city. Monthly rainfall, humidity and temperature changes over the 15-year-period were also considered to enhance the understanding of vegetation change dynamics. There was no evidence of correlation between any climate variable compared to the vegetation indices. Based on NDVI and EVI MODIS imagery the spatial distribution of urban areas in Erbil and the bare around it has expanded. Consequently, the vegetation area has been cleared and replaced over the past 15 years by urban growth
Co-ordination and public administration in a global economy — A Hungarian point of view
The purpose of social co-ordination mechanisms is to co-ordinate the activities of individuals and organisations specialised in the distribution of work. The paper reviews five basic types of mechanisms: market, bureaucratic, ethical, aggressive and co-operative co-ordination. Today’s world operates on the basis of a duality: international cooperation is based on nation states, in which the public administrations work according to bureaucratic coordination. However, the increasingly globalised market responds to the logic of market coordination. The article argues that in terms of understanding the working of public administration, the various coordination mechanisms are of crucial importance, especially where various mechanisms meet, such as the relationship between nation states and multinational corporations
Complex regulation of CREB-binding protein by homeodomain-interacting protein kinase 2.
CREB-binding protein (CBP) and p300 are transcriptional coactivators involved in numerous biological processes that affect cell growth, transformation, differentiation, and development. In this study, we provide evidence of the involvement of homeodomain-interacting protein kinase 2 (HIPK2) in the regulation of CBP activity. We show that HIPK2 interacts with and phosphorylates several regions of CBP. We demonstrate that serines 2361, 2363, 2371, 2376, and 2381 are responsible for the HIPK2-induced mobility shift of CBP C-terminal activation domain. Moreover, we show that HIPK2 strongly potentiates the transcriptional activity of CBP. However, our data suggest that HIPK2 activates CBP mainly by counteracting the repressive action of cell cycle regulatory domain 1 (CRD1), located between amino acids 977 and 1076, independently of CBP phosphorylation. Our findings thus highlight a complex regulation of CBP activity by HIPK2, which might be relevant for the control of specific sets of target genes involved in cellular proliferation, differentiation and apoptosis
Exact ground states for the four-electron problem in a Hubbard ladder
The exact ground state of four electrons in an arbitrary large two leg
Hubbard ladder is deduced from nine analytic and explicit linear equations. The
used procedure is described, and the properties of the ground state are
analyzed. The method is based on the construction in r-space of the different
type of orthogonal basis wave vectors which span the subspace of the Hilbert
space containing the ground state. In order to do this, we start from the
possible microconfigurations of the four particles within the system. These
microconfigurations are then rotated, translated and spin-reversed in order to
build up the basis vectors of the problem. A closed system of nine analytic
linear equations is obtained whose secular equation, by its minimum energy
solution, provides the ground state energy and the ground state wave function
of the model.Comment: 10 pages, 7 figure
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