Time filter

Source Type

Lund, Sweden

Flensburg C.,Solvegatan
Proceedings - 38th International Symposium on Multiparticle Dynamics, ISMD 2008 | Year: 2012

A series of previous papers [1] develops a dipole model in initial state impact parameter space that includes subleading effects such as running αs, unitarity, confinement and saturation. Here some recent work [2] is presented, where the model is applied to a new set of data: vector meson production in γ*p, DVCS and dσ/dt in pp. This allows us to tune a more realistic model of the proton wavefunction from the pp data, and confirm the predictive power of the model in high Q2 of DVCS and vector meson production. For low Q2 vector meson resonances dominate the photon wavefunction, making our predictions depend on a tuned parametrisation in this range. Source

Late Svecofennian granite is frequent in the Bothnian Basin, especially in zones of rapidly changing metamorphic grade but also in areas, where the metamorphic grade is elevated. The granite is essentially undeformed, but weakly foliated or lineated rocks are common; more rarely are rocks strongly foliated. X-ray fluorescence was used for major-element and ICP-MS for trace-element analyses. The chemical composition is almost invariably peraluminous, calc-alkaline and strict granitic. The mean of the molecular ratio Al2O3/(CaO þ Na2O þ K2O) is 1.3 with an almost normal distribution. It straddles the boundary between S-and I-type granites (where the value 1.1 is used as the boundary). The source is made up of mixtures in any proportions of igneous and sedimentary rocks, and this boundary is not a strict boundary between source rocks. Trace-element variation is immense. Rare earth element patterns are somewhat different for I-and S-type granites, but otherwise no systematic difference depending on the I/S character has been found. The metasedimentary rocks in the source were probably enriched in Sr and show evidence of oxidation. Breakdown of biotite and, probably to some extent, muscovite delivered the necessary volatiles for melting. Volatiles were important for the evolution of the granite giving non-CHARAC effects among others tetrad effects to the low-temperature granite. Degrees of melting were moderate and probably variable but cannot be quantified. Zr-saturation temperatures vary (820 ±1488C (2s)), but are higher for I-type than for S-type granites. The lowest temperatures occur in low-grade areas probably representing high intrusion levels. © Geologiska Föreningen. Source

Flensburg C.,Solvegatan
AIP Conference Proceedings | Year: 2011

Diffractive excitation is usually described by the Good-Walker formalism for low masses, and by the triple-Regge formalism for high masses. In the Good-Walker formalism the cross section is determined by the fluctuations in the interaction. By taking the fluctuations in the BFKL ladder into account, it is possible to describe both low and high mass excitation in the Good-Walker formalism. In high energy pp collisions the fluctuations are strongly suppressed by saturation, which implies that pomeron exchange does not factorise between DIS and pp collisions. The Dipole Cascade Model reproduces the expected triple-Regge form for the bare pomeron, and the triple-pomeron coupling is estimated. © 2011 American Institute of Physics. Source

Kulma K.,Uppsala University | Low M.,Swedish University of Agricultural Sciences | Bensch S.,Solvegatan | Qvarnstrom A.,Uppsala University
Molecular Ecology | Year: 2013

Parasites may influence the outcome of interspecific competition between closely related host species through lower parasite virulence in the host with which they share the longer evolutionary history. We tested this idea by comparing the prevalence of avian malaria (Haemosporidia) lineages and their association with survival in pied and collared flycatchers (Ficedula hypoleuca and F. albicollis) breeding in a recent contact zone on the Swedish island of Öland. A nested PCR protocol amplifying haemosporidian fragments of mtDNA was used to screen the presence of malaria lineages in 1048 blood samples collected during 6 years. Competitively inferior pied flycatchers had a higher prevalence of blood parasites, including the lineages that were shared between the two flycatcher species. Multistate mark-recapture models revealed a lower survival of infected versus uninfected female pied flycatchers, while no such effects were detected in male pied flycatchers or in collared flycatchers of either sex. Our results show that a comparatively new host, the collared flycatcher, appears to be less susceptible to a local northern European malarial lineage where the collared flycatchers have recently expanded their distribution. Pied flycatchers experience strong reproductive interference from collared flycatchers, and the additional impact of species-specific blood parasite effects adds to this competitive exclusion. These results support the idea that parasites can strongly influence the outcome of interspecific competition between closely related host species, but that the invading species need not necessarily be more susceptible to local parasites. © 2013 John Wiley & Sons Ltd. Source

Scanning Electron Microscopy and Energy Dispersive Analysis are used to study minute-sized crystals of high-field-strength-element minerals in an evolved batch of fluorine-rich granite. The batch separated due to buoyancy from the bulk magma before fluid separation was reached. Fluorine acted as the main complexing agent in the magma, facilitating the transport of many elements. Enhanced concentrations of elements such as Nb, Y, rare earth elements, Th and possibly Be gave the granite an accessory mineral composition similar to that of NYF pegmatite. Biotite was chloritized and often no remaining biotite can be identified. Frequent are two minerals from the aeschynite-euxenite-polycrase group. One is blocky and formed together with chlorite. It was replaced by an acicular variety, which continued to crystallize into the late hydrothermal stage. Bastnäsite and synchysite are also common in the granite. Both started crystallizing together with chlorite, but only synchysite can be followed into the late hydrothermal stage. Hingganite and gadolinite occur as inclusions in fluorite and chlorite. Galgenbergite formed as fracture-fillings. Some other rare minerals have merely been identified as accidental inclusions, but their identification is less certain. They include brenkite, fluocerite, fergusonite and possibly håleniusite. Chemical heterogeneities in the minerals point to incomplete equilibration. © 2012 Copyright Geologiska Föreningen. Source

Discover hidden collaborations