Search results

Laser wakefield electron acceleration in the blow-out regime and the associated betatron X-ray radiation were investigated experimentally as a function of the plasma density in a configuration where the laser is guided. Dielectric capillary tubes were employed to assist the laser keeping self-focused over a long distance by collecting the laser energy around its central focal spot. With a 40 fs, 1

We present a study of the phonon and impurity interactions in a shallow two dimensional electron gas formed in Si(001). A highly conductive ultra-narrow n-type dopant delta-layer, which serves as a platform for quantum computation architecture, is formed and studied by angle resolved photoemission spectroscopy (ARPES) and temperature dependent nanoscale 4-point probe (4PP). The bandstructure of th

The behavior of a sterically crowded neutral pincer {2,6-bis[(di-t-butylphosphino)methyll-phenyl}palladium (PCPPd) halides, PCPPdX (X = Cl, Br or I), as XB acceptors with strong halogen bond (XB) donors, iodine (I(2)), 1,4-diiodotetrafluorobenzene (F4DIBz), and 1,4-dliodooctafluorobutane (F8DIBu) were studied in the solid state. The co-crystallization experiments afforded high-quality single cryst

Large scale, homogeneous quasi-free standing monolayer graphene is obtained on cubic silicon carbide, i.e., the 3C-SiC(111) surface, which represents an appealing and cost effective platform for graphene growth. The quasi-free monolayer is produced by intercalation of hydrogen under the interfacial, (6 root 3 x 6 root 3)R30 degrees-reconstructed carbon layer. After intercalation, angle resolved ph

Understanding the genetic consequences of changes in population size is fundamental in a variety of contexts, such as adaptation and conservation biology. In the study presented here, we have performed a replicated experiment with the plant Nigella degenii to explore the quantitative genetic effects of a single-founder bottleneck. In agreement with additive theory, the bottleneck reduced the mean

Accurate quantification of photosensitizers is in many cases a critical issue in photodynamic therapy. As a noninvasive and sensitive tool, fluorescence imaging has attracted particular interest for quantification in pre-clinical research. However, due to the absorption of excitation and emission light by turbid media, such as biological tissue, the detected fluorescence signal does not have a sim

Popular Abstract in Swedish Atomkärnan byggs upp av protoner (positiv laddning) och neutroner (neutrala). Förutom skillnaden i elektrisk laddning är protonerna och neutronerna relativt snarlika; dom har till exempel nästan samma massa. Ofta kallas protoner och neutroner med ett gemensamt namn för nukleoner. Kraften som binder samman nukleonerna i en atomkärna benämns kärnkraften. Det finns ett anIn a series of experiments using the tagged photon facility at MAX-lab located in Lund, Sweden, the two-body photodisintegration of ³He has been investigated in the photon energy range 14--32 MeV. Differential cross sections of the reaction ³He(g,d) have been measured by detecting deuterons and protons in silicon surface barrier detectors. The detectors were configured into four particle identific

Peripheral areas with declining traditional industries often see tourism as a solution for multiple macroeconomic problems. In these regions particularly small and medium-sized enterprises constitute the backbone of the tourism product, and thus are regarded as key players in economic restructuration and rejuvenation (Cooper and Buhalis 1992). At the same time, non-price factors have come into foc

Popular Abstract in Swedish Ämnet hållfasthetslära behandlar metoder och principer för att kunna bestämma deformationer och spänningar i en fast kropp som utsätts för belastning. Avhandlingen behandlar skademekanik, vilket rör hur skador (porer, håligheter, mikrosprickor och dylikt) påverkar materialets egenskaper och hur skadorna påverkas av belastning. Vidare förutsätter skademekaniken att materPlasticity induced damage evolution is considered using a thermodynamical approach. Different postulates on how to include the effects of damage in the constitutive equations have been studied. The results reveal that a mapping, similar to that of the stress, of both the kinematic and isotropic hardening variables is to be preferred. The undesired property that, irrespectively of the postulate emp

OBJECTIVE: To describe and enhance our understanding of how persons with late effects of polio experience the influence of an interdisciplinary rehabilitation programme. PARTICIPANTS: Twelve persons with clinically verified late effects of polio who had participated in an individualized, goal-oriented, comprehensive interdisciplinary rehabilitation programme. METHODS: Qualitative research intervie

The dynamics of a swirl-stabilized premixed flame is studied using large eddy simulation (LES). A filtered flamelet model is used to account for the subgrid combustion. The model provides a consistent and robust reaction-diffusion expression for simulating the propagation of turbulent premixed flames correctly. The numerical results were found to be relatively insensitive to small changes in the i

Molecularly imprinted polymers (MIPs) are synthetic materials that mimic the behavior of natural antibodies while exhibiting far greater stability than their natural counterparts. Although potentially very useful as recognition elements in chemical sensors, a major obstacle to their widespread application has been the difficulty in preparing MIPs in the thin-film format that is necessary for coupl

The moisture-induced warping of three-layered cross-laminated solid wood panels made of Norway spruce was studied. The panels were exposed to different climate conditions at 65% and 100% relative humidity at the two panel faces. The results showed increasing cup deformation with an increasing relative thickness of the outer layers. The annual growth ring orientation was found to have a significant

Social differences in the role of habits in health-related behaviour are explored within both sociology and economics, where we define habits as non-reflective, repetitive behaviour. The corresponding theoretical perspectives are the habitus theory, the theory of individualization, and habits as rational decision rules. Sixteen thematically structured interviews are analysed using qualitative meth

The properties of elementary excited states in the B850 band of the peripheral light-harvesting antenna (LH2) of the photosynthetic purple bacterium Rhodobacter sphaeroides has been studied at room temperature by means of femtosecond transient absorption experiments combined with computer simulations. Polarized pump-probe kinetics have a fast component of 100 and 65 fs for the anisotropic and isot

Measurements of inclusive and differential production cross-sections of a top-quark-top-antiquark pair in association with a W boson (tt¯W) are presented. They are performed by targeting final states with two same-sign or three isolated leptons (electrons or muons) and are based on s = 13 TeV proton-proton collision data with an integrated luminosity of 140 fb−1, recorded from 2015 to 2018 with th

Pathological processes often change the mechanical properties of cells. Increased rigidity could be a marker of cellular malfunction. Erythrocytes are a type of cell that deforms to squeeze through tiny capillaries; changes in their rigidity can dramatically affect their functionality. Furthermore, differences in the homeostatic elasticity of the cell can be used as a tool for diagnosis and even f