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| 2. |
- Ahlstrom Silversand, AF, et al.
(author)
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Combustion of methane over a Pd-Al2O3/SiO2 catalyst, catalyst activity and stability
- 1997
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In: Applied Catalysis A: General. - 0926-860X. ; 153:1-2, s. 157-175
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Journal article (peer-reviewed)abstract
- Palladium supported on Si-stabilised alumina has been demonstrated to be an active and durable catalyst for the combustion of methane. Si is more effective in stabilising alumina than La or Ba when the elements are added through an impregnation technique. Multiple stabilisation with combinations of La, Ba and Si does not increase further the stability against sintering. The stability increases logarithmically with the amount of Si added (0.5-8 atomic%). The rate of sintering is not affected by an increase of the water vapour content of the atmosphere from 1 to 20 vol.%. Doping palladium with rhodium or platinum increases the activity of the catalyst for methane combustion. The high-temperature stability of pure Pd is however superior to the stabilities of the Rh- and Pt-doped catalysts. Addition of La or Ce to the Pd-catalyst increases its stability against thermal deactivation but leads to an overall decrease in activity. The activity of the as-prepared catalysts are affected by the Pd-content below a value corresponding to 5% of the monolayer capacity. Thermally deactivated catalysts show a stronger activity dependence of the Pd-content than as-prepared catalysts. The combustion reaction is first order with respect to methane and zero-order with respect to oxygen (>2 vol.% of oxygen). Carbon dioxide has no inhibitory effects on the combustion. The activity of the Pd-catalyst is decreased by a factor of 5 through deactivation at 1473 K for 768 h. The decrease in activity is linearly correlated to the decrease in specific surface area.
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| 3. |
- Anonby, Erik, et al.
(author)
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Kholosi
- 2018
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In: Encyclopædia Iranica. - London : Routledge. - 0710090900 ; , s. 539-541
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Book chapter (other academic/artistic)
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| 6. |
- Bergfelt, Andreas, et al.
(author)
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Mechanically Robust and Highly Conductive Di-Block Copolymers as Solid Polymer Electrolytes for Room Temperature Li-ion Batteries
- 2018
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Conference paper (other academic/artistic)abstract
- Alternative solid polymer electrolytes (SPEs) hosts to the archetype poly(ethylene oxide) are gaining attention thanks to their appealing properties, such as higher cation transport number, thermal stability and electrochemical stability [1]. In addition, high mechanical stability is required in order to integrate easy-to-use materials into flexible or ‘structural’ batteries [2, 3]. In this work, a solid polymer electrolyte (SPE) featuring high ionic conductivity and mechanical robustness at room temperature is presented. The SPE consists of a di-block copolymer, poly(benzyl methacrylate)-poly(ε-caprolactone-r-trimethylene carbonate) (BCT), mixed with different loadings of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). The highest ionic conductivity achieved for these SPEs was found with 16.7 wt% LiTFSI loading (BCT17), reaching 9.1 x 10-6 S cm-1 at 30 °C. The limited current fraction (F+) for the BCT17 electrolyte was calculated to be 0.64 with the Bruce-Vincent method. Furthermore, dynamic mechanical analysis showed a storage modulus (E’) of 0.2 GPa below 40 °C and 1 MPa above 50 °C. These results indicate that BCT with LiTFSI is a competitive electrolyte, combining high ionic conductivity and modulus at ambient temperatures. LiFePO4|BCT17|Li half-cells showed good cycling performance at 60 °C. At 30 °C, where the SPE possessed significantly higher modulus, decent cell performance could still be achieved after several optimization steps. These included incorporating a SPE as binder, and infiltration cast the SPE on the electrode to maximize the contact between both components, thereby improving the interfacial contact and decreasing the cell resistance and overpotential when cycling the battery device. References[1] J. Mindemark, M.J. Lacey, T. Bowden, D. Brandell. Prog Polym Sci, (2018). DOI: 10.1016/j.progpolymsci.2017.12.004.[2] J.F. Snyder, R.H. Carter, E.D. Wetzel. Chem Mater, 19 (2007) 3793-801.[3] W.S. Young, W.F. Kuan, Thomas H. Epps. J Polym Sci, Part B: Polym Phys, 52 (2014) 1-16.
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| 7. |
- Bruynzeel, DP, et al.
(author)
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Monitoring the European standard series in 10 centres 1996-2000
- 2005
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In: Contact Dermatitis. - : Wiley. - 0105-1873 .- 1600-0536. ; 53:3, s. 146-149
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Journal article (peer-reviewed)abstract
- A 5-year retrospective study of the frequency of sensitization to the 25 allergens of the European standard series (ESS) was conducted in 10 centres in 8 European countries. Included were the results of 26 210 patients. The range in sensitivities differed moderately between the centres. Combining results of different centres and drawing conclusions on incidences can be done only with great care. The information on the ranking of the allergens and their sensitization incidence in the clinics are useful for decisions on the future composition of the standard series. The ESS is still a valid screening tool, and no substances should be deleted.
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| 8. |
- Brånemark, Per-Ingvar, et al.
(author)
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How human applications began. Why osseointegration would work and how it did in the first patients treated. Basic facts and philosophical thoughts.
- 2005
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In: Brånemark, P-I. [et al.] (eds). The osseointegration book : from calvarium to calcaneus. - Berlin : Quintessence. - 1850970904
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Book chapter (other academic/artistic)abstract
- In this document on osseointegration in the rehabilitation of edentulous individuals, a summarizing clinical and radiographic presentation of patients, who were among the first to be treated in accordance with this concept, will be made. In 1969, a state of third dentition was provided for a then 45-year-old woman. Four fixtures - 5 mm long with diameter 3.5 mm - were anchored in each jaw. The achieved rehabilitation was successfully maintained until her death in 2001 - 32 years later. Since 1965, all edentulous patients treated according to the osseointegration philosophy have been regularly monitored with respect to clinical status and function by means of a standardized protocol 1-7 . To provide an understanding of the efficiency of the clinical procedures and of possible early and late problems in maintaining a longterm rehabilitation, achieved by a third dentition, we have now selected all patients initially treated between 1971 and 1975. Using an end-point in the year 2001, this yields a minimum of 26 years' follow-up of a reasonably standardized clinical procedure, applied to a group of 138 consecutive edentulous patients: 78 maxillae and 72 mandibles; 54 males and 84 females. We also present some of the early, pioneer, patients to provide a feeling of the technical, biologic and psychological reality at the time of introduction of osseointegration to clinical dentistry. Most of these patients were also included in the initial publications from the introduction and development periods. The goal was to establish a jawbone-anchored third dentition within the limits of acceptable side effects and reasonable requirement on adjustments, even in the perspective of the entire lifetime of the patient l.2 .To illustrate what often meets a new clinical procedure that is introduced into a sometimes, and understandably, fairly hostile atmospherebecause of concern for patient safety - we have chosen to use radiographs as an objective method of documentation.
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| 10. |
- De Angelis, Alessio, et al.
(author)
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Application of time-to-digital converters to radio-frequency distance measurement
- 2013
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In: NoMe - TDC 2013 - 2013 IEEE Nordic Mediterranean Workshop on Time to Digital Converters, Proceedings. - 9781479911844 ; , s. 31-35
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Conference paper (peer-reviewed)abstract
- The application of TDCs to wireless distance measurement problems is evaluated by means of experimental tests using a realized system. The system is capable of measuring the round-trip-time of ultra-wideband radio pulses propagating between two active transceivers, utilizing a commercial TDC with sub-nanosecond resolution. The results show an operational range of approximately 30 m in an indoor environment, with a distance-measurement error of less than 0.5 m in approximately 90% of the considered cases. Further, a discussion of the fundamental error sources is provided, analyzing the effect of RF interference, timing jitter, received signal strength, and propagation conditions.
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