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Search Results: 1 - 10 of 1548 matches for " Petra Trnková "
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A detailed dosimetric comparison between manual and inverse plans in HDR intracavitary/interstitial cervical cancer brachytherapy
Petra Trnková,Dimos Baltas,Andreas Karabis,Markus Stock
Journal of Contemporary Brachytherapy , 2010,
Abstract: Purpose: The purpose of this study was to compare two inverse planning algorithms for cervical cancer brachytherapy and a conventional manual treatment planning according to the MUW (Medical University of Vienna) protocol.Material and methods: For 20 patients, manually optimized, and, inversely optimized treatment plans with Hybrid Inverse treatment Planning and Optimization (HIPO) and with Inverse Planning Simulated Annealing (IPSA) were created. Dosimetric parameters, absolute volumes of normal tissue receiving reference doses, absolute loading times of tandem, ring and interstitial needles, Paddick and COIN conformity indices were evaluated.Results: HIPO was able to achieve a similar dose distribution to manual planning with the restriction of high dose regions. It reduced the loading time of needles and the overall treatment time. The values of both conformity indices were the lowest. IPSA was able to achieve acceptable dosimetric results. However, it overloaded the needles.This resulted in high dose regions located in the normal tissue. The Paddick index for the volume of two times prescribed dose was outstandingly low.Conclusions: HIPO can produce clinically acceptable treatment plans with the elimination of high dose regions in normal tissue. Compared to IPSA, it is an inverse optimization method which takes into account current clinical experience gained from manual treatment planning.
Effect of soil temperature and moisture on the pathogenicity of two species of entomopathogenic nematodes (Rhabditida: Steinernematidae)
těpánka Radová , Zuzana Trnková
Journal of Agrobiology , 2010, DOI: 10.2478/s10146-009-0001-4
Abstract: This study investigated the impact of soil temperature and soil moisture on the virulence of the entomopathogenic nematodes Steinernema carpocapsae and S. feltiae. The effects of temperatures of 10, 15 and 25 °C and humidity of 6% and 12.5% were tested against the larvae of Tenebrio molitor. The nematodes were tested in two concentrations of 50 nematodes and 500 nematodes per box. S. carpocapsae was generally significantly more efficient at the highest temperature (25 °C) than S. feltiae, especially at the lower concentration of 50 nematodes per box. S. feltiae recorded higher insect mortality at lower temperatures (15 °C and 10 °C). The virulence of both tested nematode species was low (0-26%) at 10 °C after 7 days, but in the case of S. feltiae increased to 66% after 14 days. The efficacy when tested with 6% moisture at 15 °C was low (4% for both nematode species) compared with 12.5% moisture, where after seven days it reached 54% for S. carpocapsae and 70% for S. feltiae, although generally, S. feltiae was more efficient under dry conditions than S. carpocapsae. Insect mortality inreased significantly after remoistening of the soil, especially with S. feltiae (500 nematodes per box) where mortality reached 46% two weeks after remoistening.
The Religiosity of Japanese Migrants in the Czech Republic  [PDF]
Petra Tlcimukova
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.21002
Abstract: This study examines the role of religion in lives of the Japanese migrants in the Czech Republic. Scholars have been dealing with issues concerning both the religiosity and migration for a long time. The contemporary sociology of religion offers various theoretical and methodological tools to approach both social phenomena; nevertheless, regarding the transformative character of both of them, it remains difficult to characterize the nexus of the various modes of religiosity and migration development. Based on critics of contemporary research on migrants religiosity, I propose a qualitative approach that builds upon the postulates of theories of transnationalism and draws on Jean-Claude Kaufmann’s method of understanding interviews. The method of gaining and analysing the interviews conducted with the Japanese living long-term in the Czech Republic allowed me to observe the process of religious identity construction, or in other words to uncover the deeper levels of claims concerning their relationship with religion. The results of my empirical investigation and analysis show that 1) not all migrants create transnational identities, 2) the method of understanding interview allowed some respondents to construct their own individualized and fragmented religious identities, 3) not all religious identities of migrants can be interpreted as transnational.
Paper puncture tester: a new instrument for facile evaluation of paper strength
V. Bukovsky,M. Trnková,I. Kuka,A. Marková
E-Preservation Science , 2006,
Abstract: A simple apparatus for evaluation of paper strength is described. Determination of the depth of puncture (P) of a metal spike into paper is evaluated, which causes only limited damage to the sample. A measurement of paper thickness is also needed. Determinations of puncture resistance of a representative group of paper from a library collection were correlated with the number of double folds (DF). The obtained correlation enables easy categorisation of papers into risk groups according to their mechanical properties.
Effect of Cultural Differences in Reaction of Students to Ambiguous Art Stimulus  [PDF]
Petra Potmesilova, Petra Sobkova, Marcela Fojtikova Roubalova
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.211008
Abstract:

Reconstruction is one of the basic methods used in art therapy and the artphiletic approach to work with a client. The method of Reconstruction can be used in practice not only for development of imagination, but also as a means of obtaining information about the ways clients react to ambiguous stimuli. The present article compares reactions of students of Palacky University in Olomouc and students of Sichuan University at Chengdu to an ambiguous stimulus using the reconstruction method.

Physical Activity Improves Mental Rotation Performance  [PDF]
Petra Jansen, Stefanie Pietsch
Creative Education (CE) , 2010, DOI: 10.4236/ce.2010.11009
Abstract: Even there seemed to be general knowledge that physical activity enhanced spatial cognitive performance almost none experimental studies on this influence exist. For that the influence of physical activity on mental rotation per-formance is investigated in this study. Mental rotation is the ability to imagine how an object would look if rotated away from the original orientation. Two groups of 44 students of educational science each solved a psychometrical mental rotation task with three-dimensional block figures. After this, the participants of the physical activity group took part in a sport lesson, whereas the participants of the cognitive activity group attended an oral lesson of kinematics. Both lessons took 45 minutes. Thereafter, all participants solved the mental rotation task again. The results showed that the participants of the physical activity group improved their mental rotation performance whereas the participants of the cognitive activity showed no improvement.
Collective Actions in the European Union—American or European Model?  [PDF]
Verica Trstenjak, Petra Weingerl
Beijing Law Review (BLR) , 2014, DOI: 10.4236/blr.2014.53015
Abstract: Collective redress is a procedural mechanism that allows for reasons of procedural economy and efficiency of enforcement many similar legal claims to be combined into a single court action. Consumers and investors encounter problems with the enforcement of their rights through the individual redress, especially in times of the financial crisis. If a substantial number of harmed individuals decide not to pursue their, usually low, claims, the unduly gained profits of the opposite party can be extremely high. Thus, collective redress mechanisms can represent better option for consumers and investors, as their claims tend to be much less burdensome in case of the collective action. However, such mechanisms can trigger the abuse of the procedures, with the most commonly quoted threat being the example of American regulation of class actions. Negative characteristics of American model are the reasons that EU decided to shape its own concept of collective redress mechanisms. The binding act in this field in the EU is directive on injunctions for the protection of consumers’ interests; however, there is no binding act yet regarding compensatory actions. In June 2013, the European Commission published the Recommendation on common principles for injunctive and compensatory collective redress mechanisms in the Member States concerning violations of rights granted under Union Law. It is not binding on Member States, however, it can serve as a guideline to improve their existing legislations, especially the regulation of collective compensatory actions. In so doing, consumers and investors might be given the possibility to use more efficient mechanism to compensate the harm suffered.
The Relation between Performance and Flows of Mutual Funds: Case of the Croatian Fund Market  [PDF]
Darko Brborovic, Petra Posedel
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.519292
Abstract: With pre 2008 euphoria and present depression, inflows to open investment funds and outflows from it shaped general market conditions on the Croatian fund market. This article studies the relationship between performance of open ended investment funds and inflows (outflows) to them on Croatian funds data in an environment without long fund data history, with small number of funds and relatively illiquid underlying equity market. The results suggest that the driving forces behind funds’ flows encompass the combined influence of present month fund’s performance and persistency of past performances. At the end of our analysis we test the significance of the introduced explanatory variables on the data sets that include data for each particular fund. The significance of the introduced explanatory variables varies among different funds, although a general level of the explanatory power is maintained on average.
Discriminating Depression, Physical and Social Anhedonia by Neurotransmitter Related Challenge Tests  [PDF]
Petra Netter, Juergen Hennig
Psychology (PSYCH) , 2016, DOI: 10.4236/psych.2016.73030
Abstract:

The aim of this study was to investigate, if anhedonia, a salient component of depression, shows similar response patterns to neurotransmitter challenge tests as depression, and if the two questionnaire based components Physical (PA) and Social (SA) Anhedonia can be discriminated by differences in drug related size and time of cortisol responses elicited by the specific serotonin (5- HT) and noradrenaline (NA) reuptake inhibitors citalopram and reboxetine and prolactin responses to the dopamine (DA) agonist bromocriptine orally applied to 36 male volunteers in a double blind balanced cross-over design. Analyses of variance applied to placebo corrected hormone responses revealed that low and late DA responses were characteristics of global Depression and of Physical Anhedonia, and that low DA responses were associated with high NA responses in PA, and with low 5-HT responses in SA. These patterns were explained by differences in transmitter production and receptor sensitivities and proved to be suitable to discriminate PA from SA and from global depression by analysing neurochemical response patterns rather than single means of variables.

Evidence-Based Physiotherapy Culture—The Influence of Health Care Leaders in Sweden  [PDF]
Petra Dannapfel, Per Nilsen
Open Journal of Leadership (OJL) , 2016, DOI: 10.4236/ojl.2016.53006
Abstract: Research in physiotherapy has increased rapidly over the last decade, yet studies have shown that many practice decisions continue to be based on knowledge obtained during initial physiotherapy education and/or personal experience, rather than findings from research. Both barriers and facilitators to achieving a more evidence-based practice (EBP) in physiotherapy have been identified. Leadership is a facilitator that has been recognized to have an important influence on the implementation of EBP in various settings. Our aim was to explore how physiotherapy leaders in Sweden influence the culture for implementation of evidence-based physiotherapy practice. Nine interviews with managers of physiotherapy clinics were conducted in various settings in Sweden. Data were analysed using qualitative analysis and a framework developed by Schein (Schein, 2010). Organizational Culture and Leadership (4th ed.). San Francisco, CA: Jossey-Bass) was applied. The framework identifies a number of mechanisms by which leaders can influence the culture of an organization and/or groups within an organization. The mechanisms of paying attention to, measuring and controlling on a regular basis as well as deliberate role modelling, teaching and coaching did have some relevance. However, EBP issues seemed to depend on committed individuals, often younger physiotherapists, who were interested in research. Overall, there was limited relevance for most of the embedding mechanisms. The findings suggest that physiotherapy leaders in Sweden contribute to a modest degree to establishing a culture conducive to implementation of an evidence-based physiotherapy practice.
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