TY - CONF A1 - Plarre, Rüdiger T1 - Invasoren im Kleiderschrank N2 - Die Kleidermotte wird als invasive Art (Neozoon) beschrieben. T2 - Lange Nacht der Wissenschaften, FU Berlin, FB Biologie CY - Berlin, Germany DA - 11.06.16 KW - Kleidermotte KW - Invasive Arten KW - Neozoon PY - 2016 AN - OPUS4-36964 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Fontana, Patrick A1 - Miccoli, Lorenzo A1 - Hoppe, Johannes T1 - Beton mit funktionalen Oberflächen N2 - Beton ist als Massenbaustoff vielseitig einsetzbar. Eine der neuesten Entwicklungen ist Ultrahochleistungsbeton (UHPC). Seine besonderen Eigenschaften ermöglichen eine zusätzliche Funktionalisierung der Oberflächen, da annähernd beliebige Mikrostrukturen exakt abgeformt werden können. So lassen sich beispielsweise Fassadenelemente aus UHPC bereits bei ihrer Herstellung im Betonfertigteilwerk mit selbstreinigenden Oberflächen ausrüsten. Eine andere Möglichkeit ist eine Anwendung als Datenspeicher. Wie das Beispiel der Schallplatte aus UHPC zeigt, lassen sich Muster, die hier die Schallinformationen enthalten, exakt von einer Matrize kopieren. T2 - Lange Nacht der Wissenschaften 2016 CY - Berlin, Germany DA - 11.06.2016 KW - UHPC KW - Selbstreinigung KW - Datenträger KW - Betonschallplatte PY - 2016 AN - OPUS4-36948 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Simon, Sebastian A1 - Meng, Birgit A1 - Selleng, Christian T1 - A new sample holder for fast xrd investigation on UHPC N2 - A new sample holder is described in this poster. It was developed in BAM for fast XRD investigation on UHPC (ultra high performance concrete). Results measuring solid, i.e. not pulverized, samples are shown. T2 - GeoBerlin 2015 CY - Berlin, Germany DA - 04.10.2015 KW - Building Materials KW - UHPC KW - X-ray diffractometry PY - 2015 AN - OPUS4-36949 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weise, Frank A1 - Meng, Birgit A1 - Werner, Daniel T1 - Influence of aggregate size on the damage potential of alkal-silica-reaction N2 - The poster shows new results on Alkali-Silica-Reaction (a damage mechanism of concrete). The influence of the aggregate size in the sand fraction is investigated, revealing that different types of aggregate behave in a different way. T2 - 15th International Conference of Alkali Aggregate Reaction in Concrete (ICAAR 2016) CY - Sao Paulo, Brazil DA - 03.07.2016 KW - Alkali-silica-reaction KW - Building materials KW - Concrete KW - Durability PY - 2016 AN - OPUS4-36951 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Epping, Ruben A1 - Falkenhagen, Jana T1 - Characterization of statistical EO-PO copolymers containing different end groups by UPLC/ESI-MS N2 - Commercial statistical ethylene oxide (EO) and propylene oxide (PO) copolymers of different monomer compositions and different average molar masses were studied by liquid chromatography under critical conditions (LCCC). Theoretical predictions of the existence of a critical adsorption point (CPA) for statistical copolymers with a given chemical and sequence distribution, could be studied and confirmed. An improved way to determine these critical conditions in a copolymer, alongside the inevitable chemical composition distribution (CCD), with the aid of mass spectrometric detection is described. Shift of the critical eluent composition with the monomer composition of the polymers could be observed. Due to the relatively low average molecular weight, broad molecular weight distribution (MWD) and the presumed existence of different end group functionalities as well as sequence distribution, gradient separation only by CCD was not possible. Therefore isocratic separations at the CPA of definite CCD’s were applied. Although the various present distributions partly superimposed the separation process the goal of separation by end group functionality could still be achieved on the basis of the additional dimension of ESI-MS. The existence of HO-H besides the desired AllylO-H end group functionalities could be confirmed and their amount could be estimated. T2 - International Symposium GPC/SEC and Related Techniques CY - Amsterdam, The Netherlands DA - 26.09.2016 KW - Polymers KW - UPLC KW - ESI-TOF-MS PY - 2016 AN - OPUS4-37632 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schade, U. A1 - Ritter, E. A1 - Puskar, L. A1 - Aziz, E. F. A1 - Beckmann, Jörg T1 - Estimation of THz waveforms for material characterization of stratified objects N2 - The poster discusses theoretically and exemplarily the influence of the materials and experimentally selected situation on the shape and size deformation of a detected pulse signal previously reflected on a three layer sheet. T2 - 41st International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2016) CY - Copenhagen, Denmark DA - 25.09.2016 KW - THz spectroscopy KW - Pulse reflection KW - Pulse shape analysis KW - Optical layer model PY - 2016 AN - OPUS4-37639 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Madkour, Sherif A1 - Penner, P. A1 - Zhang, X. A1 - Gölzhäuser, A. A1 - Schönhals, Andreas T1 - Dielectric investigations on carbon nanomembranes N2 - Multilayer carbon nanomembrances (CNMs) could pave the way for a new ultrathin functional conductive coatings with tunable electrical, optical, and chemical properties. Due to their molecular thickness, they can also be regarded as “interfaces without bulk” separating regions of different gaseous, liquid, or solid components and controlling the materials exchange between them, making them optimal materials for membranes applications. Furthermore, their physical and chemical properties depend strongly on their structure, molecular composition, and the surroundings of either sides, thus allowing for tailored properties. Here, nanolayers of Aromatic p-terphenylthiol (TPT) self-assembled into 2D carbon monolayers (thickness - 1.6 nm) were synthesized and further crosslinked by ion bombardment, forming CNMs. Here, though a recently developed multilayer nanosheets routine, stacks of 5, 10, 15 and 20 TPT sheets where transferred on top of each other forming a multilayered CNMs. However, this transfer routine could introduce some intrinsic defects to the sheets, which would alter the molecular composition and / or structure, thus consequently the CNMs properties. Therefore, it is essential to characterize defects in “pure” TPT nanomembranes, before tailoring the molecular compositions, e.g. adding functional groups. For this reason, broadband dielectric spectroscopy (BDS) was utilized to characterize any defects that could be rasied during preparation. Due the structure of pure TPT membranes, no dipole moment should exsist. However, the presence of other elements, e.g. water or sulphur, would result in a dipole moment that could be probed by BDS. As a main result, for all different stacked-layer numbers, a clear relaxation process is seen, which moves to higher frequencies with increasing the temperature. The temperature dependence of the relaxation rate of this process is independent of film thickness and can be well described by a common VFT function, hence a corporative motion. This relaxation process was assigned to intrinisic defects in the membranes, introduced during preparation, which was further confimed by a detailed anaylsis of the dielectric strength. This is the first BDS measurment on TPT CNMs. T2 - 9th International Conference on Broadband Dielectric Spectroscopy and its Applications CY - Pisa, Italy DA - 11.09.2016 KW - Carbon nanomembranes PY - 2016 AN - OPUS4-37527 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wu, Cheng-Chieh A1 - Weisbrich, S. A1 - Neitzel, F. T1 - Determination of an approximate anisotropic model for a given geometrical complex isotropic structure by means of finite element method and least-squares adjustment N2 - Many engineering structures are made of composite materials or metal foam. To simulate the deformational behaviour of these structures often requires a high number of discretisation elements. This in turn yields a very large system of linear equations that are extremely time and memory consuming or practically impossible to solve. It is therefore desirable to find an approach to overcome this obstacle. T2 - PhD Day 2016 CY - Berlin, Germany DA - 01.09.2016 KW - Least-Squares Adjustment KW - Inverse Analysis KW - Finite Element Method PY - 2016 AN - OPUS4-37521 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wu, Cheng-Chieh A1 - Weisbrich, S. A1 - Neitzel, F. T1 - Approximate model for geometrical complex structures N2 - Many engineering structures are made of composite materials or metal foam. To simulate the deformational behaviour of these structures often requires a high number of discretisation elements. This in turn yields a very large system of linear equations that are extremely time and memory consuming or practically impossible to solve. It is therefore desirable to find an approach to overcome this obstacle. T2 - 33rd Danubia- Adria Symposium on Advances in Experimental Mechanics CY - Portorož, Slovenia DA - 20.09.2016 KW - Inverse analysis KW - Finite element method KW - Least-squares adjustment PY - 2016 AN - OPUS4-37523 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bresch, Sophie A1 - Mieller, Björn A1 - Rabe, Torsten T1 - Optimization of Solid-State-Reactions of Calcium Cobaltite Ca3Co4O9 N2 - Calcium cobaltite is a promising p-type oxide thermoelectric material for high temperature applications due to its high figure of merit between 600 °C and 900 °C in air. The solid-state-reaction is well known for large scale powder synthesis of functional materials. As a high temperature process, the powder synthesis consumes a lot of energy. In different studies, different synthesis conditions were used for the preparation of calcium cobaltite powder. This study showed that a higher energy input (elevated temperatures, longer dwell times, or repeated calcinations) during powder synthesis does not increase but decrease the Seebeck coefficient and the electrical conductivity. The same correlation was determined for the densification. As a higher energy input leads to a larger grain size and therefore to a reduced sinter activity, it can be concluded that the thermoelectric properties are correlated with the sinter activity of the powder. These results can be used to minimize the energy demand for the powder synthesis of Ca₃Co₄ O₉. T2 - 14th European Conference on Thermoelectrics CY - Lisbon, Portugal DA - 20.09.2016 KW - Thermoelectrics KW - Solid-State-Reaction KW - Calcium cobaltite PY - 2016 AN - OPUS4-37543 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -