|
|
Study of thin film catalysts for oxygen reduction reaction on proton exchange membrane fule cell cathode
Komárková, Zuzana ; Matolín, Vladimír (advisor) ; Václavů, Michal (referee)
In this thesis, we present the investigation of influence of methanol crossover, which significantly decreases the performance of DMFC (Direct Methanol Fuel Cell). Additionally the poisoning effect occurs on the cathode side. The durability of cathode catalyst exposed by methanol vapor is studied. Moreover, the regene- rative behavior after exposition has been found. The comparison of commercial catalyst with our own sputtered Pt and PtCo and PtRu thin layers as cata- lyst is presented. Obtained results have shown that PtCo is reasonable compro- mise between pure Pt, which has high performance, and PtRu, which is tolerant to methanol poisoning. Future research should further evaluate the advantages of PtCo cathode catalyst prepared by standard procedures and its market poten- tial in comparison with PtRu. 1
|
|
|
Prospective study of long-term neurological sequelae of acute methanol poisoning
Kotíková, Kateřina ; Zacharov, Sergej (advisor) ; Pohanka, Miroslav (referee) ; Ehler, Edvard (referee)
Background: Methanol is widely industrially used alcohol with known neurotoxic properties. Bilateral necrosis of basal ganglia is a typical finding detected on MRI or CT scan of the brain in acute methanol poisoning. The impact of methanol exposure on peripheral nervous system is unknown. Aim: To study the prevalence and predisposing factors of haemorrhagic and non-haemorrhagic brain lesions in survivors of acute methanol poisoning; to investigate whether 123 I-ioflupane SPECT (DaT SPECT) has the potential as a marker of basal ganglia damage in acute methanol poisoning; to investigate the role of acute methanol exposure in the development of peripheral polyneuropathy (PNP) during the years following discharge from the hospital. Methods: A six year prospective, single-centre, cohort study of patients with confirmed methanol poisoning was conducted. The examination protocol consisted of neurological examination, including magnetic resonance imaging (MRI) of the brain, DaT SPECT and electromyographic examination, further, visual evoked potentials, ocular examination with retinal nerve fiber layer thickness measurement, series of biochemical and toxicological tests. In 46 patients, follow-up examinations including brain MRI were performed 3-8 and 24-28 months after discharge from the hospital, in 42...
|
|
|
Analysis of the media image of the methanol poisoning in the Czech media
Kočvarová, Linda ; Barták, Miroslav (advisor) ; Rogalewicz, Vladimír (referee)
Background: "Methanol poisoning" case is a sequence of events that began in the autumn of 2012, when a mass series of methanol poisoning occurred throughout the Czech Republic. The case had great coverage by Czech media. The way that the mass media informed about the evolvement of the poisoning cases (health-threatening events with the drug dimension) and how they fulfilled their public role remains to be one of the important problems of contemporary addictology theories. Aims: The primary goals of this paper were both quantitative and subsequently qualitative analysis of the selected time period of methanol poisoning cases (from 3 September 2019 to 5 April 2018 in terms of their interpretation and presentation in national printed Czech media). Sample and Methods: A homogenous sample of 366 articles was analyzed using 33 research variables. The source of news for coding was the Newton media monitoring media database. The collected data were sorted into pivot and association tables and subjected to statistical analysis. Using standard tools (Pearson's chi-squared test), predicted hypotheses about the correlation (dependence) of acquired attributes were confirmed or rejected. Pareto analysis identified the most influential media. Results: The research has answered a number of specific questions: What...
|
|
|
Study of thin film catalysts for oxygen reduction reaction on proton exchange membrane fule cell cathode
Komárková, Zuzana ; Matolín, Vladimír (advisor) ; Václavů, Michal (referee)
In this thesis, we present the investigation of influence of methanol crossover, which significantly decreases the performance of DMFC (Direct Methanol Fuel Cell). Additionally the poisoning effect occurs on the cathode side. The durability of cathode catalyst exposed by methanol vapor is studied. Moreover, the regene- rative behavior after exposition has been found. The comparison of commercial catalyst with our own sputtered Pt and PtCo and PtRu thin layers as cata- lyst is presented. Obtained results have shown that PtCo is reasonable compro- mise between pure Pt, which has high performance, and PtRu, which is tolerant to methanol poisoning. Future research should further evaluate the advantages of PtCo cathode catalyst prepared by standard procedures and its market poten- tial in comparison with PtRu. 1
|
guest ::
