Additive Manufacturing of Casting Tools Using Powder-Binder- Jetting Technology

This chapter presents the use of the additive manufacturing (AM) method powder-binder-jetting (PBJ) for the generation of molds and cores for casting applications. Theoretical information on process steps and the binding of particles is given. For the based chemistry, examples are presented and the transfer from conventional production processes to powder-binder-jetting is explained. For sand as a material for metal casting, methods to determine key properties for the casting are in focus. The figures found by our research activities reach up to that of conventional production and indicate the readiness of the technology. These cavities produced by powder-binder-jetting can even be used for cold casting materials such as concrete. Several demonstrators show the impact of this application. A polymer process for the investment casting process is topic of an additional section. To understand this process, theoretical information and figures determined by measurements are presented

Design und 2D Kristallisation von organischen Liganden und Metallkomplexen für die Entwicklung neuer funktioneller Oberflächen

In this work molecules with catalytic and magnetic properties were used to structure and to functionalize surfaces. For this we used the simple but powerful technique of molecular self organisation which is employed since the beginning of organic life to produce highly complicated units. Even 2D crystals can be obtained applying this method. For this reason novel functional surfaces with catalytic and magnetic properties become accessable which are attactive materials for molecular electronics. Especially multi nuclear compounds are of great interest because of synergistic interactions between the metal centers. In the last years such complexes were in the focus of actual research due to their magnetic properties. The occurring spin coupling phenonema of the metal ions in multinuclear complexes are of great importance in the development of new information storage devices. In this work especially the design and the two dimensional self organisation of ligands and particularly metal complexes with interesting catalytic and magnetic properties were in the main focus of investigation. Highly ordered monolayers were created by exposing a drop of a solution of the designed functionalized organic and corresponding metal organic compounds in proper solvents like 1,2,4 trichlorobenzene or 1-octanol on the surface of a freshly cleaved highly oriented pyrolytic graphite (HOPG). The self organized arrangements of the molecules were visualised by scanning tunneling microscopy (STM) at the liquid/solid interface. The metal complexes were investigated in respect to their catalytic and magnetic properties. Furthermore in a synthetical approach derivatives of 2,4-dihydroxybenzaldehyde with polymerizable groups were prepared in order to stabilize the resulting physisorbed monolayers by intermolecular connection

Bikers Accessing the Web: The SmartWeb Motorbike Corpus

Three advanced German speech corpora have been collected during the German SmartWeb project. One of them, the SmartWeb Motorbike Corpus (SMC) is described in this paper. As with all SmartWeb speech corpora (e.g. (Mogele et al., 2006)) SMC is designed for a dialogue system dealing with open domains. The corpus is recorded under the special circumstances of a motorbike ride and contains utterances of the driver related to information retrieval from various sources and different topics. Audio tracks show characteristic noise from the engine and surrounding traffic as well as drop outs caused by the transmission over Bluetooth and the UMTS mobile network. We discuss the problems of the technical setup and the fully automatic evocation of natural-spoken queries by means of dialogue-like sequences

SmartWeb UMTS Speech Data Collection -- The Smartweb Handheld Corpus

In this paper we outline the German speech data collection for the SmartWeb project, which is funded by the German Ministry of Science and Education. We focus on the SmartWeb Handheld Corpus (SHC), which has been collected by the Bavarian Archive for Speech Signals (BAS) at the Phonetic Institute (IPSK) of Munich University. Signals of SHC are being recorded in real-life environments (indoor and outdoor) with real background noise as well as real transmission line errors. We developed a new elicitation method and recording technique, called situational prompting, which facilitates collecting realistic dialogue speech data in a cost efficient way. We can show that almost realistic speech queries to a dialogue system issued over a mobile PDA or smart phone can be collected very efficiently using an automatic speech server. We describe the technical and linguistic features of the resulting speech corpus, which will be publicly available at BAS or ELDA

Precise chemical, electronic, and magnetic structure of binuclear complexes studied by means of X-ray spectroscopies and theoretical methods

We investigate two planar complexes MnNi and CoNi (see Scheme 1) by X-ray photoelec- tron spectroscopy (XPS) and ultralow-temperature X-ray magnetic circular dichroism (XMCD). In this way the valence states as well as the presence of uncompensated magnetic moments are obtained. The magnetism has been probed at a temperature of 0.6 K in order to reveal the magnetic ground state properties. We find that divalent Ni ions are in a diamagnetic low spin ground state in both complexes; however, in MnNi a small fraction of divalent nickel high-spin ions leads to a residual XMCD signal, indicating parallel spin alignment with the Mn spins. Mn and Co are found to be in a divalent high-spin configuration in both compounds. Theoretically, we address the energetic ordering of the different possible spin states of the binuclear complexes using (zeroth-order) relativistic approximation density functional calculations and a triple-ζ quality basis set. These results show that intermediate-spin states are often favored over low-spin states for most both metal combinations, in qualitative agreement with our experimental observations