8,677 research outputs found
Influence of management practices on quality and biodiversity of tomatoes in Germany
Four old and endangered tomato cultivars were cultivated under greenhouse conditions with different levels of organic N-fertilisation and harvest at different maturity stages in order to develop a conclusive concept to preserve the diversity of old, endangered and multicolour cultivars. First results of several physio-chemical and sensory parameters were analysed to describe product quality. In order to assess consumer acceptance, 550 consumers were interviewed. The individual attributes of the cultivars, which differ in size, shape, colour, taste and health-related, beneficial physio-chemicals, are promoted by optimal harvest time. A combination of these cultivars distributed in regional markets is considered as a suitable concept for saving these endangered cultivars
Molecular gas in blue compact dwarf galaxies
Blue compact dwarf galaxies (BCDGs) are currently undergoing strong bursts of
star formation. Nevertheless, only a few of them have been clearly detected in
CO, which is thought to trace the "fuel" of star formation: H_2. In this paper,
we present a deep search for CO J=1-->0 and J=2-->1 emission lines in a sample
of 8 BCDGs and two companions. Only 2 of them (Haro 2 and UM 465) are detected.
For the other galaxies we have obtained more stringent upper limits on the CO
luminosity than published values. We could not confirm the previously reported
``detection'' of CO for the galaxies UM 456 and UM 462. We analyze a possible
relation between metallicity, CO luminosity, and absolute blue magnitude of the
galaxies. We use previously determined relations between X = N(H_2)/I_CO and
the metallicity to derive molecular cloud masses or upper limits for them. With
these ``global'' X_CO values we find that for those galaxies which we detect in
CO, the molecular gas mass is similar to the HI mass, whereas for the
non-detections, the upper limits on the molecular gas masses are significantly
lower than the HI mass. Using an LVG (Large Velocity Gradient) model we show
that X_CO depends not only on metallicity, but also on other physical
parameters such as volume density and kinetic temperature, which rises the
question on the validity of ``global'' X_CO factors.Comment: 9 pages, 6 figures, to be published on MNRA
Editorial
This issue of the Journal of Façade Design and Engineering is a result of the second façade conference, PowerSkin, held on January 17th 2019, in the context of the building trade fair ‘BAU’ in Munich. The conference was organized collaboratively by TU Munich, TU Darmstadt, and TU Delft. All three universities conduct high-impact research and education in the field of building envelopes.
The conference featured a mix of practice and education experiences, as well as scientific contributions, and aimed to answer the key question of the 2019 conference: How can digital tools and methods promote changes that aim towards the decarbonisation of the built environment and the improvement of well-being? The 2019 conference focused on the envelope as an integral part of the building and its energy system, as well as the main driver to create comfort. Thus, the envelope is understood in its condition of being a complex interface to the social, economic, and climatic environment in which we build our cities. The interaction between these topics, the influences they create, and the digital tools that have been developed and used to design and engineer building envelopes are the main focus points of each of the papers published in this issue.
We thank our guest editors Thomas Auer (TU Munich) and Jens Schneider (TU Darmstadt), and their respective teams, who have been key partners in creating this special issue
Little Boxes: A Dynamic Optimization Approach for Enhanced Cloud Infrastructures
The increasing demand for diverse, mobile applications with various degrees
of Quality of Service requirements meets the increasing elasticity of on-demand
resource provisioning in virtualized cloud computing infrastructures. This
paper provides a dynamic optimization approach for enhanced cloud
infrastructures, based on the concept of cloudlets, which are located at
hotspot areas throughout a metropolitan area. In conjunction, we consider
classical remote data centers that are rigid with respect to QoS but provide
nearly abundant computation resources. Given fluctuating user demands, we
optimize the cloudlet placement over a finite time horizon from a cloud
infrastructure provider's perspective. By the means of a custom tailed
heuristic approach, we are able to reduce the computational effort compared to
the exact approach by at least three orders of magnitude, while maintaining a
high solution quality with a moderate cost increase of 5.8% or less
Imagine: Deflateables
Pneumatic structures are thoroughly investigated and developed during the 1960s. However, the energy crisis and aesthetic developments impeded the use of these structures as a mainstream construction method. Nowadays, they are typically used in special areas of architecture and design. Deflateables concentrates on the very limited knowledge of vacuum constructions and develops a range of aesthetic, technical and functional design possibilities.
However, very few designs that use pressurised constructions have actually been realised, even right down to the present day - despite the fact that this technology offers simple, positive aspects: the air pressure of the earth can be used as a stabilising and form-giving parameter, creating a specific and inspiring shape. In addition, the very nature of this technology provides varying degrees of thermal and acoustic insulation. Of course, there are weak points such as potential leakage and the need for high pressurisation of the construction; but new material technologies and specific structural concepts will bring solutions to such issues. Exploiting the possibilities of extremely light and energetically active constructions, deflateables are one of the promising fields of architectural and design developments. The chance to create structures that can move and react to requests such as user and climate requirements, as well as formative demands, lifts this topic onto the level of a realistic and usable technology for as-yet unknown design possibilities. 
- …