International Graduate School Zittau

Zittau, Germany

International Graduate School Zittau

Zittau, Germany
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Dos Santos J.A.,Federal University of Paraná | Harland P.,International Graduate School Zittau
2012 18th International Conference on Engineering, Technology and Innovation, ICE 2012 - Conference Proceedings | Year: 2012

In product development projects in a collaborative environment, it is not uncommon for professionals to work toward goals that do not result in successful, competitive products. One way of avoiding this problem is to employ objective indicators to represent the product's competitiveness and facilitate communication in the project team. This article proposes a Customer Satisfaction indicator for this purpose, which is especially useful for product improvement projects. This indicator makes it possible to (1) simulate Customer Satisfaction at a future date based on the modifications being proposed today and (2) verify how much the technical characteristics of a product actually contribute to Customer Satisfaction. It facilitates communication among professionals from different backgrounds, especially in a collaborative product development process. Practical applications are introduced, simulated and discussed. © 2012 IEEE.


Le T.P.Q.,Vietnam Academy of Science and Technology | Seidler C.,International Graduate School Zittau | Kandler M.,International Graduate School Zittau | Tran T.B.N.,Phao Dai Lang street
Hydrological Processes | Year: 2012

Potential evapotranspiration (ETP) is an important part of a climatic water balance and a crucial variable in many kinds of models in computing actual evapotranspiration. The objective of this study was to find a reasonable approach of ETP calculation for a height-differentiated landscape in subtropical climate. From the pool of diverse approaches, six common methods [Hamon, Priestley-Taylor, Thornthwaite, Blaney-Criddle, Turc and Food and Agricultural Organization Irrigation and Drainage Paper No. 56 (FAO-56)] were selected. With the meteorological data for long-term period (1964-2008), the calculation of ETP values was performed for 12 different meteorological stations in the Red River basin. Among the applied ETP calculation methods, the Turc and the FAO-56 methods agreed well at most stations and represent best the expectations for the ETP values of the Thao and Da subbasins. The findings of our investigations indicate that in highly structured (land use and elevation) regions, not all methods provide satisfying results. © 2011 John Wiley & Sons, Ltd.


Snajdr J.,Academy of Sciences of the Czech Republic | Steffen K.T.,University of Helsinki | Hofrichter M.,International Graduate School Zittau | Baldrian P.,Academy of Sciences of the Czech Republic
Soil Biology and Biochemistry | Year: 2010

Litter decomposing basidiomycetous fungi produce ligninolytic oxidases and peroxidases which are involved in the transformation of lignin, as well as humic and fulvic acids. The aim of this work was to evaluate their importance in lignin transformation in forest litter. Two litter decomposing basidiomycete species differing in their abilities to degrade lignin - Hypholoma fasciculare, and Gymnopus erythropus - were cultured on sterile or non-sterile oak litter and their transformation of a 14C-labelled synthetic lignin (dehydrogenation polymer 14C-DHP) was compared with that of the indigenous litter microflora. Both in sterile and non-sterile litter, colonisation by basidiomycetes led to higher titres of lignocellulose-degrading enzymes, in particular of laccase and Mn-peroxidase (MnP). The titres of the latter were 6 to 40-fold increased in the presence of basidiomycetes compared to non-sterile litter. During 10 weeks, G. erythropus mineralised over 31% of 14C-DHP in sterile litter and 23% in non-sterile litter compared to 14% in the non-sterile control. Lignin mineralization by H. fasciculare was comparable to the non-sterile control, 12% in sterile litter and 16% in the non-sterile litter. The largest part of 14C from 14C-DHP was transformed into humic compounds during litter treatment with both fungi as well as in the control. In addition to the fast lignin mineralization, microcosms containing G. erythropus also showed a lower final content of unaltered lignin and 23-28% of the lignin was converted into water-soluble compounds with relatively low molecular mass (<5kDa). Both G. erythropus and H. fasciculare were also able to further mineralise humic compounds. During a 10-week fungal treatment of an artificial 14C-humic acid (14C-HA) supplemented to the natural humic material of a forest soil, the fungi mineralised 42% and 19% of the labelled material, respectively, under sterile conditions. The 14C-HA mineralization by introduced basidiomycetes in microcosms containing non-sterile humic material, however, did not significantly differ from that of a non-sterile control and was around 12%. Altogether the results show that saprobic basidiomycetes can considerably differ in their rates of lignin and humic substance conversion. Furthermore, lignin degradation in forest soil can rather slow down by interspecific competition than it is accelerated by cooperation of different microorganisms occupying specific nutritional niches. Therefore, the overall contribution of saprobic basidiomycetes depends on their particular eco-physiological status and the competitive pressure, and may be often lower than initially expected. Significant lignin transformation including partial mineralization is seemingly not exclusively dependent on exceptional high titres of ligninolytic enzymes but also on so far unknown factors. Higher endocellulase production and subsequent weight loss was found in microcosms where saprobic basidiomycetes were combined with indigenous microbes. Potentially, lignin degradation by the basidiomycetes may have increased cellulose availability to the indigenous microbes. © 2010 Elsevier Ltd.


Markert B.,Fliederweg 17 | Wuenschmann S.,Fliederweg 17 | Fraenzle S.,International Graduate School Zittau | Graciana Figueiredo A.M.,Brazilian Nuclear Energy Research Institute (IPEN) | And 2 more authors.
Environmental Pollution | Year: 2011

After considering the particular problems of atmospheric pollution in megacities, i.e. agglomerations larger than 5 mio. inhabitants, with urbanization of World's population going on steadily, possibilities of active biomonitoring by means of green plants are discussed. Based on specific definitions of active and passive bioindication the chances of monitoring heavy metals in Sao Paulo megacity were demonstrated (first results published before). This is to show that there is need for increased use of bioindication to tackle the particular problems of megacities concerning environmental "health", the data to be processed according to the Multi-Markered-Bioindication-Concept (MMBC). Comparison to other work shows this approach to be reasonable. © 2011 Elsevier Ltd. All rights reserved.


Seidel N.,International Graduate School Zittau
WikiSym 2012 Conference Proceedings - 8th Annual International Symposium on Wikis and Open Collaboration | Year: 2012

Current wikis cannot be used to host or author rich dynamic hypervideos along with hypertext elements. In this article vi-wiki is presented as an approach for seamless and collaborative integration of interactive hypervideos into MediaWiki. Vi-wiki combines the wiki metaphor with a direct manipulation user interface for hypervideo authoring and particular markup conventions. The research makes a contribution to collaborative work and learning with wikis. It enables users to annotate spatio-temporal hyperlinks as well as composite sequential video clips through both, a graphical user interface and a generic markup language. © 2012 Author.


Jacobasch C.,Goethe University Frankfurt | Volker C.,Goethe University Frankfurt | Giebner S.,Goethe University Frankfurt | Volker J.,Goethe University Frankfurt | And 6 more authors.
Environmental Pollution | Year: 2014

We investigated the impact of nanoscaled titanium dioxide (nTiO 2) on Daphnia magna populations in a multi-generational study over six generations (F0-F5). Each generation was exposed for 21 days to nTiO 2 (AEROXIDE® TiO2 P25, primary particle size 21 nm) while mortality, individual growth, reproduction and population growth rates (PGR) were assessed as endpoints. The size distribution of nTiO2 in the single test media was analysed by dynamic light scattering (DLS) and transmission electron microscopy (TEM). nTiO2 concentrations were measured using ICP-MS. Mortality and individual growth of D. magna were significantly affected with increasing exposure duration and concentration. Daphnids demonstrated decreasing reproduction over generations in all treatment groups (1.19-6 mg/L) but not in the control. At concentration levels of 1.78 mg/L chronic exposure resulted in a population collapse after five generations. This study indicates that multi-generational studies are suitable for evaluating long-term effects of nanoparticles since they reflect potential effects more accurately than single generation tests. © 2013 Elsevier Ltd. All rights reserved.


Seidel N.,International Graduate School Zittau
ECCE 2011 - European Conference on Cognitive Ergonomics 2011: 29th Annual Conference of the European Association of Cognitive Ergonomics | Year: 2011

Motivation - Wikis are Web-based collaborative systems that allow users to create, share and interlink content. Existing Wikis restrict users to edit and arrange text with other embedded media formats. Unfortunately moving pictures are handled as a whole without considering their temporal dimension. Their time-related composition and association with other parts of the wiki are withhold from the users influence. Thus, current wikis cannot be used to host or author rich dynamic and interactive hypervideos along with hypertext elements. Research approach - A comparison of hypermedia systems and video production tools as well as wiki software was made to identify requirements of time-based user interfaces for hypervideo authoring environments. Findings/Design - In this paper I present an approach for seamless and collaborative integration of interactive hypervideos into existing wiki environments. The wiki metaphor is combined with a direct manipulation user interface for hypervideo authoring and particular markup conventions. Originality/Value - The research makes a contribution to collaborative work and learning with wikis. It enables users to annotate spatio temporal hyperlinks as well as composite sequential video clips through both, graphical user interface and generic markup language. Take away message - Moving images within wikis can communicate ideas in ways that text can not. These images can be interconnected with other wiki contents. © 2011 Author.


PubMed | International Graduate School Zittau and Goethe University Frankfurt
Type: | Journal: Environmental pollution (Barking, Essex : 1987) | Year: 2014

We investigated the impact of nanoscaled titanium dioxide (nTiO2) on Daphnia magna populations in a multi-generational study over six generations (F0-F5). Each generation was exposed for 21 days to nTiO2 (AEROXIDE() TiO2 P25, primary particle size 21 nm) while mortality, individual growth, reproduction and population growth rates (PGR) were assessed as endpoints. The size distribution of nTiO2 in the single test media was analysed by dynamic light scattering (DLS) and transmission electron microscopy (TEM). nTiO2 concentrations were measured using ICP-MS. Mortality and individual growth of D. magna were significantly affected with increasing exposure duration and concentration. Daphnids demonstrated decreasing reproduction over generations in all treatment groups (1.19-6 mg/L) but not in the control. At concentration levels of 1.78 mg/L chronic exposure resulted in a population collapse after five generations. This study indicates that multi-generational studies are suitable for evaluating long-term effects of nanoparticles since they reflect potential effects more accurately than single generation tests.

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