| 1. |
- Powell, John, et al.
(författare)
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Fibre laser cutting of thin section mild steel : An explanation of the ‘striation free’ effect
- 2011
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Ingår i: Optics and lasers in engineering. - : Elsevier BV. - 0143-8166 .- 1873-0302. ; 49:8, s. 1069-1075
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents the results of an experimental and theoretical investigation into the phenomenon of 'striation free cutting', which is a feature of fibre laser/oxygen cutting of thin section mild steel. The paper concludes that the creation of very low roughness edges is related to an optimisation of the cut front geometry when the cut front is inclined at angles close to the Brewster angle for the lasermaterial combination
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| 2. |
- Carbonell, Adrià
(författare)
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Territorial ecologies : a new ground for spatial justice
- 2015
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Konferensbidrag (refereegranskat)abstract
- This paper will argue that in order to understand contemporary processes of neoliberal urbanization and to revert its lucrative destruction, the planetary dimension of the phenomena needs to be tackled (Brenner, 2014), and the isotropic sea of urbanization needs to be reconfigured into sustainable territorial ecologies. Drawing on Neil Smith’s “Uneven Development” and Saskia Sassen’s “Territory, Authority, Rights”, a new understanding of the territory will be put forward. The research will look into territorial ecologies as a new conceptual and design tool, thus redefining the relation between architecture, geography and landscape. Strategies of intervention will be defined in order to reformulate a new model of city making oriented towards a collective re-appropriation and democratic management of specific contexts, paying special attention to notions of ecology and infrastructure.
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| 3. |
- Mukunthan, Shriram, et al.
(författare)
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A comparison between physical and virtual experiments of convective heat transfer between head and bicycle helmet
- 2017
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Ingår i: Advances in Human Factors in Simulation and Modeling - Proceedings of the AHFE 2017 International Conference on Human Factors in Simulation and Modeling, 2017. - Cham : Springer International Publishing. - 2194-5357. - 9783319605906 ; 591, s. 517-527
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Konferensbidrag (refereegranskat)abstract
- Thermal performance of five bicycle helmets was evaluated with a thermal manikin head with six zones. Evaluation was made with physical and virtual experimental methods. Ambient temperature maintained at 24 °C and surface temperature of the thermal manikin head was set to 34 °C. Experiments were performed for air velocities of 1.6 m/s and 6 m/s. Heat transfer (W) of four thermal zones was recorded for five helmets and compared with a nude thermal manikin head to assess thermal performance. Virtual experiments were performed using commercial CFD codes with a realizable k-e turbulence model. Correlation coefficients of 0.78 (1.6 m/s) and 0.79 (6 m/s) were found between physical and virtual experiments. A combined physical and virtual evaluation methodology allows creating a design iteration process with virtual prototypes, physical prototypes and commercially available helmets.
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| 4. |
- Canalias, Carlota, et al.
(författare)
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Periodic poling of KTiOPO4 : From micrometer to sub-micrometer domain gratings
- 2006
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Ingår i: Ferroelectrics (Print). - : Informa UK Limited. - 0015-0193 .- 1563-5112. ; 340:1, s. 27-47
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Tidskriftsartikel (refereegranskat)abstract
- Some novel techniques to do periodic poling of KTP are described. Emphasis on ways to avoid domain broadening and merging of domains is presented with reference to the original properties of flux grown KTP. For sub-Am structures E-beam lithography and deep UV-laser lithography were used to pattern the samples, and chemical process to promote selective poling to obtain high quality domain gratings in up to 1 mm thick samples.
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| 5. |
- D'Angelo, N., et al.
(författare)
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Local Inhomogeneous Weighted Summary Statistics for Marked Point Processes
- 2023
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Ingår i: Journal of Computational and Graphical Statistics. - 1061-8600 .- 1537-2715.
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Tidskriftsartikel (refereegranskat)abstract
- We introduce a family of local inhomogeneous mark-weighted summary statistics, of order two and higher, for general marked point processes. Depending on how the involved weight function is specified, these summary statistics capture different kinds of local dependence structures. We first derive some basic properties and show how these new statistical tools can be used to construct most existing summary statistics for (marked) point processes. We then propose a local test of random labeling. This procedure allows us to identify points, and consequently regions, where the random labeling assumption does not hold, for example, when the (functional) marks are spatially dependent. Through a simulation study we show that the test is able to detect local deviations from random labeling. We also provide an application to an earthquake point pattern with functional marks given by seismic waveforms.
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| 6. |
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| 7. |
- Fux, Thomas
(författare)
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Extracorporeal membrane oxygenation (ECMO) for the treatment of cardiogenic shock : identification of pre-implant outcome predictors
- 2018
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Background: Refractory cardiogenic shock (RCS), cardiac arrest (CA) and postarrest cardiogenic shock (CS) are associated with high mortality. Venoarterial extracorporeal membrane oxygenation (VA-ECMO) is increasingly used and can offer acute cardiopulmonary life support in this critically ill population but selection of VA-ECMO candidates remains challenging. There are limited data on which pre-VA-ECMO variables that predict outcome. Aims: To identify pre-VA-ECMO predictors for 90-day mortality in Study I unselected, Study II postcardiotomy and Study III non-surgical patients with RCS, and Study IV in patients with CA or postarrest cardiogenic shock prior to VA-ECMO were studied. Methods: Study I-IV were observational and retrospective. Study I included 181 mixed patients with RCS, Study II 105 patients with refractory postcardiotomy CS, Study III 76 non-surgical patients with RCS and Study IV 72 patients with CA or postarrest CS prior to VA-ECMO cannulation. The association between pre-implant variables and all-cause mortality at 90 days was analyzed with uni- and multivariable logistic regression. Results: Study I. Main etiologies of RCS were post-cardiotomy failure 58%, acute myocardial infarction 22% and other medical etiologies 20%. Median duration of VA-ECMO support was 7 days (interquartile range [IQR]: 3-13). The 90-day overall mortality was 54%. Arterial lactate (odds ratio [OR] per unit: 1.14; 95% confidence interval [CI]: 1.06-1.23; p <0.001), number of inotropes and vasopressors (OR per agent: 1.58; 95% CI: 1.13-2.21; p = 0.008), and ischemic heart disease (IHD), (OR: 2.90; 95% CI: 1.31-6.39; p = 0.008) were independent predictors of 90-day mortality. Study II. Main surgical subgroups were single non-CABG 29%, isolated CABG 20%, 2 and 3 concomitant surgical procedures, 31% and 20%, respectively. Median duration of VA-ECMO was 7 days (IQR: 3-14). The 90-day overall mortality and in-hospital mortality was 57% and 56%, respectively. Arterial lactate (OR per unit: 1.22; 95% CI:1.07-1.40; p = 0.004), and IHD (OR: 7.87; 95% CI: 2.55-24.3; p <0.001) were independent predictors of 90-day mortality. Study III. Main etiologies of RCS were acute myocardial infarction 51% and acute heart failure of other etiologies 49%. Median duration of VA-ECMO was 5 days (IQR: 2-11). The 90-day overall mortality was 49% and in-hospital mortality was 50%. Arterial lactate (OR per mmol/L: 1.15; 95% CI: 1.06-1.24; p = 0.001) and number of inotropes and vasopressors (OR per agent: 2.14; 95% CI: 1.26-3.63; p = 0.005) were independent predictors of 90-day mortality. Study IV. Out-of-hospital CA occurred in 12% of the patients. Initial cardiac rhythm was non-shockable in 57%, and shockable in 43% of the patients. Median cardiopulmonary resuscitation duration was 21 minutes (IQR: 10-73, range:1-197). No return of spontaneous circulation (ROSC) was present in 64% and postarrest CS in 36% of the patients at VA-ECMO cannulation. Median duration of VA-ECMO was 5 days (IQR: 2-12). The 90-day overall mortality and in-hospital mortality were 57%, respectively, and 53% died during VA-ECMO. All survivors (43%) had cerebral performance category score 1-2 at discharge to home. Initial non-shockable CA rhythm (OR: 12.2; 95% CI 2.83-52.7; p = 0.001), arterial lactate (OR per unit: 1.15; 95% CI: 1.01-1.31; p = 0.041), and IHD (OR: 7.39; 95% CI: 1.57-34.7; p = 0.011) as independent predictors of 90-day mortality. Conclusions: Identified independent pre-implant predictors for 90-day mortality after VA-ECMO initiation were in Study I arterial lactate, number of inotropes and vasopressors, and IHD, Study II arterial lactate and IHD, Study III arterial lactate, number of inotropes and vasopressors, Study IV initial non-shockable CA rhythm, arterial lactate and IHD. These predictors are easily available for pre-VA-ECMO risk prediction.
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