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101.
We demonstrate terahertz (THz) imaging with a quasi-time-domain spectrometer. This type of THz system is inexpensive, compact, and relatively easy to set up. Beating the simultaneously emitted equidistant modes of a compact diode laser allows for analysis of samples at multiple frequencies with a single measurement. Thus, this technique merges the potential of terahertz time-domain spectrometers with the simplicity of continuous wave lasers. Multiple imaging applications and stability issues are discussed. 相似文献
102.
Eleonora Cataldi Martina Raschig Dr. Marcus Gutmann Patrick T. Geppert Matthias Ruopp Marvin Schock Hubert Gerwe Dr. Rüdiger Bertermann Prof. Dr. Dr. Lorenz Meinel Prof. Dr. Maik Finze Prof. Dr. Agnieszka Nowak-Król Prof. Dr. Michael Decker Prof. Dr. Tessa Lühmann 《Chembiochem : a European journal of chemical biology》2023,24(5):e202200570
The incorporation of photoswitches into the molecular structure of peptides and proteins enables their dynamic photocontrol in complex biological systems. Here, a perfluorinated azobenzene derivative triggered by amber light was site-specifically conjugated to cysteines in a helical peptide by perfluoroarylation chemistry. In response to the photoisomerization (trans→cis) of the conjugated azobenzene with amber light, the secondary structure of the peptide was modulated from a disorganized into an amphiphilic helical structure. 相似文献
103.
These days, many systems are developed applying various UML notations to represent the structure and behavior of (technical) systems. In addition, for safety critical systems like Railway Interlocking Systems (RIS) the fulfillment of safety requirements is demanded. UML-based Railway Interlocking (UML-based RI) is proposed as a methodology in designing and developing RIS. It consists of infrastructure objects and UML is used to model the system behavior. This design is validated and demonstrated by using simulation with Rhapsody. Automated verification techniques like model checking have become a standard for proving the correctness of state-based systems. Unfortunately, one major problem of model checking is the state space explosion if too many objects have to be taken into account. Multi-object checking circumvents the state space explosion by checking one object at a time. We present an approach to enhance multi-object checking by generating counterexamples in a sequence diagram fashion providing scenarios for model-based testing. 相似文献
104.
105.
Macroeconomic models with sticky information include an infinite number of lagged expectations. Several authors have developed specialized solutions algorithms to solve these models under rational expectations. We demonstrate that it is also possible to implement this class of models in Dynare—a widely used software package for solving dynamic stochastic general equilibrium (DSGE) models. Using the Dynare macro language one can easily construct and change the required large number of lagged expectation terms. We assess the accuracy of simulations run with different truncation points for the lagged expectations terms and find that the solution is reasonably precise even for moderate truncation points. 相似文献
106.
Xiaochuan Sun Luiz F. Kawashita Tino Wollmann Sebastian Spitzer Albert Langkamp Maik Gude 《Production Engineering》2018,12(2):215-228
Braiding is an attractive manufacturing method for tubular elements such as hollow shafts and struts. One of the main challenges however is the integration of suitably performing end-fittings. Recent advances in additive layer manufacture have enabled the fabrication of end-fittings which can be ‘co-impregnated’ or ‘co-cured’ with the fibre preform in a single step, i.e. without the need for secondary adhesive bonding. This requires the introduction of protrusions onto the surface of the end-fitting to promote mechanical interlocking with the fibres. However, the lack of accurate modelling tools for the simulation of this manufacturing process means that much empiricism is currently used in the design of such structures. A novel numerical framework is presented here for the full-scale simulation of the braiding process over structured end-fittings. Nonlinear finite element analysis is applied at the meso-scale, with strands of beam elements representing individual yarns and meshed surfaces modelling the mandrel and tooling. Penalty-based contact formulations are then used to simulate all inter-yarn and yarn-metal interactions, enabling detailed predictions of fibre paths around surface protrusions. In order to verify and validate this numerical framework, a series of full-scale braiding experiments was conducted using additively-manufactured thermoplastic mandrels. Final braid patterns as well as the occurrence of braid imperfections were investigated and compared to model predictions. It is shown that the proposed modelling strategy reproduces well the trends observed experimentally in terms of final braid quality. A parametric study was then conducted on the effects of initial end-fitting alignment with respect to oncoming yarns, suggesting that better control over this parameter could reduce considerably the occurrence of braid imperfections. 相似文献
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108.
Maik Butterling Wolfgang AnwandThomas E. Cowan Andreas HartmannMarco Jungmann Reinhard Krause-RehbergArnold Krille Andreas Wagner 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2011,269(22):2623-2629
A new and unique setup for Positron Annihilation Spectroscopy has been established and optimized at the superconducting linear electron accelerator ELBE at Helmholtz-Zentrum Dresden-Rossendorf (Germany). The intense, pulsed (26 MHz) photon source (bremsstrahlung with energies up to 16 MeV) is used to generate positrons by means of pair production throughout the entire sample volume. Due to the very short gamma bunches (< 5 ps temporal length), the facility for Gamma-induced Positron Spectroscopy (GiPS) is suitable for positron lifetime spectroscopy using the accelerator’s radiofrequency as time reference. Positron lifetime and Doppler broadening Spectroscopy are employed by a coincident measurement (Age-Momentum Correlation) of the time-of-arrival and energy of the annihilation photons which in turn significantly reduces the background of scattered photons resulting in spectra with high signal to background ratios. Simulations of the setup using the GEANT4 framework have been performed to yield optimum positron generation rates for various sample materials and improved background conditions. 相似文献
109.
110.
Maik Mracek Tobias Hemsel Thomas Sattel Piotr Vasiljev Joerg Wallaschek 《Journal of Electroceramics》2008,20(3-4):153-158
Several positioning tasks demand translatory drive instead of rotary motion. To achieve drives that are capable, e.g., to
drive the sunroof of a car or to lift a car’s window, multiple miniaturized motors can be combined. But in this case many
other questions arise: The electromechanical behavior of the individual motors differs slightly, the motor characteristics
are strongly dependent on the driving parameters and the driven load, many applications need some extra power for special
cases like overcoming higher forces periodically. Thus, the bundle of motors has to act well-organized and at last controlled
to get an optimized drive that is not oversized and costly. 相似文献