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排序方式: 共有818条查询结果,搜索用时 15 毫秒
41.
S. Hassan Hosseinnia Inés Tejado Blas M. Vinagre Dominik Sierociuk 《Signal, Image and Video Processing》2012,6(3):445-451
The combination of sliding mode control and fractional order control (FOC) has received a considerable attention in the last years due to the advances and effectiveness of FOC solving robust control problems. This paper collects different methods to apply FOC in sliding mode problems through the use of fractional order surfaces and proposes a direct boolean control (BC) strategy based on this kind of surfaces. The application of BC is novel and takes advantage of avoiding the use of PWM. Simulation results for a DC-DC buck converter application are given to show the goodness of the proposed approach. 相似文献
42.
Nele Lefeldt Dominik Heyers Nils-Lasse Schneider Svenja Engels Dana Elbers Henrik Mouritsen 《Journal of the Royal Society Interface》2014,11(100)
Magnetoreception remains one of the few unsolved mysteries in sensory biology. The upper beak, which is innervated by the ophthalmic branch of the trigeminal nerve (V1), has been suggested to contain magnetic sensors based on ferromagnetic structures. Recently, its existence in pigeons has been seriously challenged by studies suggesting that the previously described iron-accumulations are macrophages, not magnetosensitive nerve endings. This raised the fundamental question of whether V1 is involved in magnetoreception in pigeons at all. We exposed pigeons to either a constantly changing magnetic field (CMF), to a zero magnetic field providing no magnetic information, or to CMF conditions after V1 was cut bilaterally. Using immediate early genes as a marker of neuronal responsiveness, we report that the trigeminal brainstem nuclei of pigeons, which receive V1 input, are activated under CMF conditions and that this neuronal activation disappears if the magnetic stimuli are removed or if V1 is cut. Our data suggest that the trigeminal system in pigeons is involved in processing magnetic field information and that V1 transmits this information from currently unknown, V1-associated magnetosensors to the brain. 相似文献
43.
René Köppel Thomas Bucher Alain Meuwly Dominik Moor 《European Food Research and Technology》2014,239(2):347-355
According to the release of authorization, several new transgenic soy crops are expected to be present in the harvest of soy beans. In contrast to earlier times, methods for the detection of these transgenic crops are available already in advance. However, these methods are mainly still inefficient single real-time PCR methods. To increase the efficiency of product control, a multiplex quantitative real-time PCR system was developed and characterized for the four new transgenic soy traits DP-356043-5, DP-305423-1, MON 87701 and BPS-CV127-9. It showed amplification efficiency, correlation and sensitivity similar to the single PCR systems applied therein. To evaluate the robustness, an appropriate testing scheme was developed and applied for the first time on this multiplex real-time PCR system. It showed the robust amplification of all analytes also in case where conditions were varied. This system allows relative multiplex quantification and/or delta–delta Ct method quantification and proofed the applicability in routine. 相似文献
44.
Monitoring kidney and renal cyst volumes applying MR approaches on a rapamycin treated mouse model of ADPKD 总被引:1,自引:1,他引:0
Wilfried Reichardt Daniel Romaker Anne Becker Martin Buechert Gerd Walz Dominik von Elverfeldt 《Magma (New York, N.Y.)》2009,22(3):143-149
Object The aim of our study was to determine total cystic volume in a mouse model of PKD using MR imaging to monitor therapeutic
effects in vivo.
Materials and methods We imaged eight female pcy-mice in two groups: four belonged to an untreated control group and four were treated with the anticystic agent rapamycin,
which has proven to be effective in reducing cystogenesis in animal models. The mice were imaged using a 9.4 Tesla animal
scanner. MRI measurements were taken at six time points during the therapy. Total renal volumes and total cyst volumes were
calculated using a thresholding approach.
Results During the course of the treatment, the total cyst volume increased significantly faster than the total renal volume in the
untreated group, indicating that growth of the total renal volume in the untreated group was primarily due to the growth of
the cysts, rather than the parenchyma. The measured total renal volume in the control (placebo) group was significantly higher
than the volume in the treated group.
Conclusion Using MRI, we were able to monitor the cystic volume in a mouse model of PKD to assess the therapeutic effect of anticystic
treatment. 相似文献
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47.
Dominik Goldstein Mathis Heyer Dion Jakobs Eduardo S. Schultz Lorenz T. Biegler 《American Institute of Chemical Engineers》2022,68(6):e17705
Surrogate models provide a powerful method for simplifying calculations within complex simulations. While surrogate models are broadly applied within chemical engineering, little research exists investigating the level of surrogacy's impact on a simplified process model. In this work, artificial neural networks (ANN) and Kriging models are used as surrogate models at the process, process unit, and thermodynamic levels for a CO2 amine scrubbing process. The surrogated models are evaluated against an Aspen Plus simulation for accuracy, convergence behavior, computational cost, and ability to extrapolate. The thermodynamic and process unit models can better handle discontinuous, non-smooth behavior, and convergence issues in the surrogated truth model, but poor conditioning in the final system of equations results in a lower accuracy and convergence rate than the process level surrogate. Beyond model accuracy, availability of diverse data, intended re-usability, and the desired outputs must be considered when selecting a level of abstraction. 相似文献
48.
49.
Wojciech H. Bednarek Filip Ciesielczyk Majka Odalanowska Dominik Paukszta Adam Piasecki 《Polymer Engineering and Science》2020,60(8):1856-1865
The activity of isotactic polypropylene (iPP) nucleating additives during shear flow of composite materials is still not entirely explained. In current work the sol-gel method was employed to synthesize MgO·SiO2 filler, surface-modified with trivalent lanthanum. The crystallization of commercial iPP in the presence of 0.5% by weight La3+ modified or unmodified silicates was analyzed. The wide angle X-ray scattering analysis proved that the presence of even small amount of filler influences significantly on supermolecular structure of iPP. The results of microscope observations confirmed that the lanthanum-modified filler shows the nucleating ability for iPP. In that case a significant reduction of crystallization induction time was noticed. The investigation of iPP crystallization in composites after shear treatment confirmed that the increase of shear rate reduces the nucleating ability of additives. Moreover, the flow of filler particles during shearing may impede the shear-induced crystallization phenomenon. 相似文献
50.
Dominik KUERES Dritan TOPUZI Maria Anna POLAK 《Frontiers of Structural and Civil Engineering》2022,16(5):624
In the past, glass fiber-reinforced polymer (GFRP)-reinforcement has been successfully applied in reinforced concrete (RC) structures where corrosion resistance, electromagnetic neutrality, or cuttability were required. Previous investigations suggest that the application of GFRP in RC structures could be advantageous in areas with seismic activity due to their high deformability and strength. However, especially the low modulus of elasticity of GFRP limited its wide application as GFRP-reinforced members usually exhibit considerably larger deformations under service loads than comparable steel-reinforced elements. To overcome the aforementioned issues, the combination of steel and GFRP reinforcement in hybrid RC sections has been investigated in the past. Based on this idea, this paper presents a novel concept for the predetermination of potential plastic hinges in RC frames using GFRP reinforcement. To analyze the efficiency of the concept, nonlinear finite element simulations were performed. The results underscore the high efficiency of hybrid steel-GFRP RC sections for predetermining potential plastic hinges on RC frames. The results also indicate that the overall seismic behavior of RC structures could be improved by means of GFRP as both the column base shear force during the seismic activity as well as the plastic deformations after the earthquake were considerably less pronounced than in the steel-reinforced reference structure. 相似文献