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"Holzbau kompakt" wurde sowohl für Studierende als auch Praktiker konzipiert und beschränkt sich nicht auf reine Holzbauaufgaben, sondern setzt sich ggf. auch mit der Tragwerkslehre auseinander. Die Neuauflage basiert auf dem Eurocode 5 und berücksichtigt zahlreiche neue Erkenntnisse aus Forschung und praxisnaher Entwicklung. Neben den Grundlagen der Bemessung, der Baustoffe, der Dauerhaftigkeit und des Brandschutzes konzentriert sich das Grundlagenwerk besonders auf das Konstruieren mit Holz und Holzwerkstoffen, anschaulich dargestellt an sehr ausführlichen Beispielen für Wohnhaus und Hallentragwerk.
Simulation model for the transient process behaviour of solar aluminium recycling in a rotary kiln
(2015)
Globale Stabilitätsanalysen zylindrischer, seismisch belasteter Tanks auf numerischer Grundlage
(2015)
Changes in intestinal microflora in rats induced by oral exposure to low lead (II) concentrations
(2015)
Gossamer-1 is the first project of the three-step Gossamer roadmap, the purpose of which is to develop, prove and demonstrate that solar-sail technology is a safe and reliable propulsion technique for long-lasting and high-energy missions. This paper firstly presents the structural analysis performed on the sail to understand its elastic behavior. The results are then used in attitude and orbital simulations. The model considers the main forces and torques that a satellite experiences in low-Earth orbit coupled with the sail deformation. Doing the simulations for varying initial conditions in attitude and rotation rate, the results show initial states to avoid and maximum rotation rates reached for correct and faulty deployment of the sail. Lastly comparisons with the classic flat sail model are carried out to test the hypothesis that the elastic behavior does play a role in the attitude and orbital behavior of the sail
Numerische Strömungssimulationen von Fließgewässern : Praxisanwendungen und zukünftige Entwicklungen
(2015)
With autonomous mobile robots receiving increased
attention in industrial contexts, the need for benchmarks
becomes more and more an urgent matter. The RoboCup
Logistics League (RCLL) is one specific industry-inspired scenario
focusing on production logistics within a Smart Factory.
In this paper, we describe how the RCLL allows to assess the
performance of a group of robots within the scenario as a
whole, focusing specifically on the coordination and cooperation
strategies and the methods and components to achieve them.
We report on recent efforts to analyze performance of teams in
2014 to understand the implications of the current grading
scheme, and derived criteria and metrics for performance
assessment based on Key Performance Indicators (KPI) adapted
from classic factory evaluation. We reflect on differences and
compatibility towards RoCKIn, a recent major benchmarking
European project.
Rugged terrain robot designs are important for field robotics missions. A number of commercial platforms are available, however, at an impressive price. In this paper, we describe the hardware and software component of a low-cost wheeled rugged-terrain robot. The robot is based on an electric children quad bike and is modified to be driven by wire. In terms of climbing properties, operation time and payload it can compete with some of the commercially available platforms, but at a far lower price.
Simultane Atline-Quantifizierung von Magnetpartikeln und Mikroorganismen bei einer HGMS-Filtration
(2015)
Es wird eine neue Atline-Messmethode vorgestellt, mit der während einer Hochgradienten-Magnetseparation (HGMS)-Filtration eine simultane Quantifizierung von Magnetpartikeln und Mikroorganismen im Filtrat vorgenommen werden kann. Dabei gelingt die Quantifizierung signifikant besser als mit bisher verwendeten Messmethoden. Mit dieser Methode ist es möglich, die Trennleistung einer HGMS-Filtration zu bestimmen und einen Filterdurchbruch durch Konzentrationsanstiege im Bereich einiger µg L−1 von Magnetpartikeln im Filtrat frühzeitig zu detektieren, ohne dass nennenswerte Partikelmengen verloren gehen.
We present an electromechanically coupled Finite Element model for cardiac tissue. It bases on the mechanical model for cardiac tissue of Hunter et al. that we couple to the McAllister-Noble-Tsien electrophysiological model of purkinje fibre cells. The corresponding system of ordinary differential equations is implemented on the level of the constitutive equations in a geometrically and physically nonlinear version of the so-called edge-based smoothed FEM for plates. Mechanical material parameters are determined from our own pressure-deflection experimental setup. The main purpose of the model is to further examine the experimental results not only on mechanical but also on electrophysiological level down to ion channel gates. Moreover, we present first drug treatment simulations and validate the model with respect to the experiments.
Capacitive field-effect electrolyte-insulator-semiconductor sensors consisting of an Al-p-Si-SiO2 structure have been used for the electrical detection of unlabelled single- and double-stranded DNA (dsDNA) molecules by their intrinsic charge. A simple functionalization protocol based on the layer-by-layer (LbL) technique was used to prepare a weak polyelectrolyte/probe-DNA bilayer, followed by the hybridization with complementary target DNA molecules. Due to the flat orientation of the LbL-adsorbed DNA molecules, a high sensor signal has been achieved. In addition, direct label-free detection of in-solution hybridized dsDNA molecules has been studied.
Capacitive field-effect sensors modified with a multi-enzyme membrane have been applied for an electronic transduction of biochemical signals processed by enzyme-based AND-Reset and OR-Reset logic gates. The local pH change at the sensor surface induced by the enzymatic reaction was used for the activation of the Reset function for the first time.
A concept for a new generation of an integrated multi-functional biosensor/actuator system is developed, which is based on biomolecular logic principles. Such a system is expected to be able to detect multiple biochemical input signals simultaneously and in real-time and convert them into electrical output signals with logical operations such as OR, AND, etc. The system can be designed as a closed-loop drug release device triggered by an enzyme logic gate, while the release of the drug induced by the actuator at the required dosage and timing will be controlled by an additional drug sensor. Thus, the system could help to make an accurate and specific diagnosis. The presented concept is exemplarily demonstrated by using an enzyme logic gate based on a glucose/glucose oxidase system, a temperature-responsive hydrogel mimicking the actuator function and an insulin (drug) sensor. In this work, the results of functional testing of individual amperometric glucose and insulin sensors as well as an impedimetric sensor for the detection of the hydrogel swelling/shrinking are presented.
Hydraulic modeling is the classical approach to investigate and describe complex fluid motion. Many empirical formulas in the literature used for the hydraulic design of river training measures and structures have been developed using experimental data from the laboratory. Although computer capacities have increased to a high level which allows to run complex numerical simulations on standard workstation nowadays, non-standard design of structures may still raise the need to perform physical model investigations. These investigations deliver insight into details of flow patterns and the effect of varying boundary conditions. Data from hydraulic model tests may be used for calibration of numerical models as well. As the field of hydraulic modeling is very complex, this chapter intends to give a short overview on capacities and limits of hydraulic modeling in regard to river flows and hydraulic structures only. The reader shall get a first idea of modeling principles and basic considerations. More detailed information can be found in the references.
An amperometric enzyme biosensor has been applied for the detection of adrenaline. The adrenaline biosensor has been prepared by modification of an oxygen electrode with the enzyme laccase that operates at a broad pH range between pH 3.5 to pH 8. The enzyme molecules were immobilized via cross-linking with glutaraldehyde. The sensitivity of the developed adrenaline biosensor in different pH buffer solutions has been studied.
Stahlbau
(2015)
Es ist zwischen Stählen bis S460 und solchen mit höherer Streckgrenze zu unterscheiden. Stähle bis S460 sind auch für die plastische Tragwerksberechnung nach dem Fließgelenkverfahren zugelassen. Bei Stählen oberhalb S460 bis S700 ist neben der elastischen eine nichtlineare plastische Tragwerksberechnung unter Berücksichtigung von Teilplastizierungen von Bauteilen in Fließzonen möglich.
Stahlbau
(2015)
Laut Zukunftsinstitut (2010) stellt die Individualisierung eine langfristige und nachhaltige Veränderung dar, die die gesamte Gesellschaft (den einzelnen Menschen, Unternehmen, den Staat) betrifft und Auswirkungen auf nahezu alle Lebensbereiche (z. B. Arbeit, Wohnen, Partnerschaft) hat. Die Individualisierung beschreibt dabei die Entwicklung hin zur Fokussierung persönlicher Interessen und Lebensentscheidungen der einzelnen Person (Kunze, Individualisierung, 2011). Der Grund für diese Entwicklung sind laut Kunze (Individualisierung, 2011) Treiber wie steigendes Vermögen, Bildung und Mobilität, was die einzelne Person unabhängiger von größeren Gemeinschaften macht und mehr Freiheit zur Selbstverwirklichung bietet. Als eine Konsequenz daraus werden Wertevorstellungen nicht mehr einfach hingenommen, sondern für die eigene Person überprüft und individualisiert (Kunze, Individualisierung, 2011). So wies Beck bereits 1996 darauf hin, dass Individualisierung meint „erstens die Auflösung und zweitens die Ablösung industriegesellschaftlicher Lebensformen durch andere, in denen die Einzelnen ihre Biographie selbst herstellen, inszenieren, zusammenflickschustern müssen“ (Beck, Die Erfindung des Politischen, 1996, S. 150).
Label-free sensing of biomolecules by their intrinsic molecular charge using field-effect devices
(2015)
Designing novel or optimizing existing biodegradable polymers for biomedical applications requires numerous tests on the effect of substances on the degradation process. In the present work, polymer-modified electrolyte–insulator–semiconductor (PMEIS) sensors have been applied for monitoring an enzymatically catalyzed degradation of polymers for the first time. The thin films of biodegradable polymer poly(d,l-lactic acid) and enzyme lipase were used as a model system. During degradation, the sensors were read-out by means of impedance spectroscopy. In order to interpret the data obtained from impedance measurements, an electrical equivalent circuit model was developed. In addition, morphological investigations of the polymer surface have been performed by means of in situ atomic force microscopy. The sensor signal change, which reflects the progress of degradation, indicates an accelerated degradation in the presence of the enzyme compared to hydrolysis in neutral pH buffer media. The degradation rate increases with increasing enzyme concentration. The obtained results demonstrate the potential of PMEIS sensors as a very promising tool for in situ and real-time monitoring of degradation of polymers.
Ausblick: Der individualitätsbezogene Diversity Management-Ansatz als Antwort auf Individualisierung
(2015)
Der Megatrend Individualisierung fordert von Unternehmen, ihre Strategien und Prozessabläufe bei zunehmender Globalisierung grundlegend zu überdenken. Während Strategien und Prozessabläufe im Unternehmen Standards unterliegen, entwickelt sich unsere Gesellschaft immer stärker zu einem individuumszentrierten System, in dem es gilt, Werte und Lebensstile der Individuen zu berücksichtigen und derart wertzuschätzen, dass Mitarbeitende motiviert und mit hoher Bindung an das Unternehmen die anstehenden Leistungen für das Unternehmen erbringen. Im Konzept DiM sind Standardisierung und Individualisierung keine gegensätzlichen Aspekte, da bei DiM neben der Betrachtung des betriebswirtschaftlichen Nutzens dieses Konzepts für Unternehmen die Wertschätzung des Individuums als genuines Merkmal betont wird.
The characterization of the degradation kinetics of biodegradable polymers is mandatory with regard to their proper application. In the present work, polymer-modified electrolyte–insulator–semiconductor (PMEIS) field-effect sensors have been applied for in-situ monitoring of the pH-dependent degradation kinetics of the commercially available biopolymer poly(d,l-lactic acid) (PDLLA) in buffer solutions from pH 3 to pH 13. PDLLA films of 500 nm thickness were deposited on the surface of an Al–p-Si–SiO2–Ta2O5 structure from a polymer solution by means of spin-coating method. The PMEIS sensor is, in principle, capable to detect any changes in bulk, surface and interface properties of the polymer induced by degradation processes. A faster degradation has been observed for PDLLA films exposed to alkaline solutions (pH 9, pH 11 and pH 13).