| 1. |
- Aguer, P, et al.
(författare)
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Skin morphology and layer identification using different STIM geometries
- 2005
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Ingår i: Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. - : Elsevier BV. - 0168-583X. ; 231:1-4, s. 292-299
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Tidskriftsartikel (refereegranskat)abstract
- The use of on-axis geometry in scanning transmission ion microscopy (STIM) has been widely used for thin biological sample structure identification. In this configuration, the lateral resolution is optimised so that micron or submicron beam spots are easily achieved even for classic microbeam lines. Off-axis STIM was more particularly employed for rapid imaging, and also (when associated to a scattering set-up) for normalising elemental contents obtained by other ion beam analysis techniques in organic thin samples. Due to the very small beam current required, on-axis STIM is a stand-alone technique. Off-axis STIM can be advantageous as it enables the simultaneous utilisation of PIXE and RBS techniques. In this paper, the STIM images obtained with an on-axis geometry, a standard off-axis geometry and a recently developed on-off geometry are presented and discussed. Data from skin samples are used for comparison purposes aiming at studying skin permeability to sunscreens. Skin is a stratified tissue and the precise identification of skin layers is needed to ascertain the penetration depth of the physical filter from the formulation. In addition to the intrinsic difference in image quality due to the beam resolution, the influence of the detector type, implanted silicon detector versus Si pin diode, is discussed on the basis of their energy resolution.. their resistance to beam damage as well as the effect
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| 2. |
- Alberdi-Muniain, Ane, et al.
(författare)
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Indirect energy flow measurement in magneto-sensitive vibration isolator systems
- 2013
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Ingår i: Applied Acoustics. - : Elsevier BV. - 0003-682X .- 1872-910X. ; 74:4, s. 575-584
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The indirect energy flow measurement method is extended to cover highly nonlinear, frequency, amplitude and magnetic field dependent magneto-sensitive natural rubber isolators applied in a real vibration isolation system. Energy flow is an effective measure of vibration isolation while being a single quantity that considers both force and velocity. The use of the indirect technique is of interest while requiring only accelerometers since it is usually difficult to directly measure the force in a real application. The vibration isolation system is composed of four magneto-sensitive rubber isolators that are inserted under a vibrating source consisting of a solid aluminium mass excited by an electro-dynamic shaker. Magneto-sensitive rubber isolators are more useful than conventional rubber isolators since the dynamic stiffness varies with the application of an external magnetic field, thus resulting in more effective vibration isolation. Various approximations regarding the indirect technique are investigated, concluding that average stiffness of magneto-sensitive isolators can be used and auto-spectrum of the foundation velocity ignored. In addition, various error analyses are performed. Finally, the indirect measurement of the energy flow is validated by direct measurements, showing very good agreement.
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| 3. |
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| 4. |
- Bombardelli, D., et al.
(författare)
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An integrability primer for the gauge-gravity correspondence : an introduction Preface
- 2016
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Ingår i: Journal of Physics A. - : Institute of Physics Publishing (IOPP). - 1751-8113 .- 1751-8121. ; 49:32
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Tidskriftsartikel (refereegranskat)abstract
- We introduce a series of articles reviewing various aspects of integrable models relevant to the anti-de Sitter (AdS)/conformal quantum field theory (CFT) correspondence. Topics covered in these reviews are: classical integrability, Yangian symmetry, factorized scattering, the Bethe ansatz, the thermodynamic Bethe ansatz, and integrable structures in (conformal) quantum field theory. In the present article we highlight how these concepts have found application in AdS/CFT, and provide a brief overview of the material contained in this series.
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| 5. |
- Bria, Aurelian
(författare)
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Hybrid cellular-broadcasting infrastructure systems : radio resource management issues
- 2006
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis addresses the problem of low-cost multicast delivery of multimedia content in future mobile networks. The trend towards reuse of existing infrastructure for cellular and broadcasting for building new systems is challenged, with respect to the opportunities for low cost service provision and scalable deployment of networks. The studies outline significant potential of hybrid cellular-broadcasting infrastructure to deliver lower-cost mobile multimedia, compared to conventional telecom or broadcasting systems. Even with simple interworking techniques the achievable cost savings can be significant, at least under some specific settings. The work starts with a foresight study shaped around four scenarios of the future, and continues with the introduction of a high-level framework for radio resource management in Ambient Networks. Two approaches on the hybrid system architecture are considered. The first one assumes different degrees of interworking between conventional cellular and broadcasting systems, in single and multi-operator environments. Second, is a broadcast only system where cellular sites are used for synchronized, complementary transmitters for the broadcasting site. In the first approach, the key issue is the multi-radio resource management, which is strongly affected by the degree of integration between the two networks. Two case studies deal with the problem of delivering, for lowest cost, a data item to a certain number of recipient users. A flexible broadcasting air interface, which offers several transmission data rates that can be dynamically changed, is demonstrated to significantly increase cost efficiency under certain conditions. An interesting result is that real-time monitoring of the user reception conditions is not needed, at least when multicast group is large. This indicates a high degree of integration between cellular and broadcasting networks may not by generally justified by visible cost savings. Scalability of the hybrid infrastructure deployment is the main topic in the second approach. For a DVB-H type of network, the numerical evaluations show that achievement of economies of scale while increasing network capacity and coverage, by employing higher modulation and coding rate or installing new transmission sites, is difficult. Therefore, a technique based on application-layer forward error correction with Raptor codingA is suggested for enabling a flexible trading between system capacity, perceived coverage and delay, in the case of mobile users.
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| 6. |
- Bria, Aurelian, et al.
(författare)
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TV in the Mobile or TV for the Mobile: Challenges and Changing Value Chains
- 2007
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Konferensbidrag (refereegranskat)abstract
- This paper intends to provide a techno-economic overview of the Mobile TV business and its business models. Recent trials have shown that a large number of people would like to consume mobile TV and few people doubt that this service will eventually be offered in the majority of wireless networks around the world. However, this service is not a simple add-on to the voice and data, but comes with totally new dimensions that challenge the present markets. The aim of this paper is to identify and describe these challenges in the technology, market behaviour, and industry strategy domains.
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| 7. |
- Chotai, Jayanti, 1948-
(författare)
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Likelihood ratio procedures for subset selection and ranking problems
- 1979
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- This report deals with procedures for random-size subset selection fromk(> 2) given populations where the distribution of ir^(i = l, ..., k)has a density f^(x;0^). Let ••• -®[k] denote unknown values ofthe parameters, and let ^[i]» ***'ïï[k] denote the corresponding populations.First, we have considered the problem of selection for consider the/sprocedure that selects TT. if sup L(0;x) > c L(0;x), where L(*;x) is the1 e e u . - - - - -itotal likelihood function, where is the region m the parameter space foriA9= (0^, ..., 0^) having 0^ as the largest component, where 9 is the maximum likelihood estimate of 0 , and where c is a given constant with 0 < c < l .With the densities satisfying seme reasonable requirements given in this report,we have shown that for each i, the probability of includingthe selected subset is decreasing in ®[j] f°r j t i anc* increasing inWe have then derived some results on selection for the t(> 1) best populations,thereby generalizing the results for t = 1. For this problem, we haveconsidered a) selection of a set whose elements consist of subsets of thegiven populations having t members, and requiring that the set of the t• » • • •best populations is included with probability at least P , b) selection ofa subset of the populations so as to include all the t best populationswith probability at least P'*, and c) selection of a subset of the populationssuch that TT[j ^ is included with probability at least P*, j=k-t+l,.•., k. In the final section, we have discussed the relation between thetheories of subset selection based on likelihood ratios and statistical inferenceunder order restrictions, and have considered the complete rankingproblem.
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| 8. |
- Eckert, Johannes A., et al.
(författare)
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An optotracer-based antibiotic susceptibility test specifically targeting the biofilm lifestyle of Salmonella
- 2022
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Ingår i: Biofilm. - : Elsevier BV. - 2590-2075. ; 4, s. 100083-
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Tidskriftsartikel (refereegranskat)abstract
- Antimicrobial resistance is a medical threat of global dimensions. Proper antimicrobial susceptibility testing (AST) for drug development, patient diagnosis and treatment is crucial to counteract ineffective drug use and resistance development. Despite the important role of bacterial biofilms in chronic and device-associated in-fections, the efficacy of antibiotics is determined using planktonic cultures. To address the need for antibiotics targeting bacteria in the biofilm lifestyle, we here present an optotracing-based biofilm-AST using Salmonella as model. Our non-disruptive method enables real-time recording of the extracellular matrix (ECM) components, providing specific detection of the biofilm lifestyle. Biofilm formation prior to antibiotic challenge can thus be confirmed and pre-treatment data collected. By introducing Kirby-Bauer discs, we performed a broad screen of the effects of antibiotics representing multiple classes, and identified compounds with ECM inhibitory as well as promoting effects. These compounds were further tested in agar-based dose-response biofilm-AST assays. By quantifying the ECM based on the amount of curli, and by visualizing the biofilm size and morphology, we achieved new information directly reflecting the treated biofilm. This verified the efficacy of several antibiotics that were effective in eradicating pre-formed biofilms, and it uncovered intriguing possible resistance mecha-nisms initiated in response to treatments. By providing deeper insights into the resistances and susceptibilities of microbes, expanded use of the biofilm-AST will contribute to more effective treatments of infections and reduced resistance development.
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| 9. |
- Eckert, Jörn, et al.
(författare)
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Einleitung
- 2004
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Ingår i: Juristische Fakultäten und Juristenausbildung im Ostseeraum: zweiter Rechtshistorikertag im Ostseeraum = Law faculties and legal education in the Baltic sea area: second Conference in Legal History in the Baltic Sea Area. - Uppsala : Kungl. Gustav Adolfs akademien för svensk folkkultur. - 9185190756 ; , s. 13-15, s. 9-12, s. 1-13, s. -357
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 10. |
- Eckert, Jan, 1981
(författare)
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Extending the New European Bauhaus—An Educational Initiative that is Much Needed to Transform Our Society
- 2022
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Ingår i: Perspectives on Design II. - Cham : Springer International Publishing. - 2661-8184. ; , s. 117-131
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- In 2020, the European Commission announced the launch of a New European Bauhaus aiming at collaborations between the world of art and design and the one of science and technology. The Commission deduced the need for such collaborations from the goals established in the European Green Deal and the Digital Transition. According to these goals the New European Bauhaus is meant to become a collaborative platform aiming at the redesign of our built environment and our energy clusters. Based upon a historical review and the author’s observations as a design researcher and educator this text reports on the first perception of the New European Bauhaus and critically reflects the question whether referring to the original institution that had to close its doors, nearly a century ago, is still relevant. Furthermore, he sets out to understand which could be the arts and design domain’s most valuable contribution to the New European Bauhaus and proposes that this contribution may lie in the art and design community’s culture of creating—or in German Entwurfskultur—and its capacity to meet the uncertain with strategies of lifelong learning. As a conclusion, the author argues that the New European Bauhaus needs to set its aims beyond the redesign of our built environment and our energy clusters and extend to an educational initiative that transforms our society by providing the current and future generations problem-based curricula based upon lifelong and transgenerational learning.
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