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排序方式: 共有169条查询结果,搜索用时 0 毫秒
91.
Z.J. Wang Krzysztof Fidkowski Rémi Abgrall Francesco Bassi Doru Caraeni Andrew Cary Herman Deconinck Ralf Hartmann Koen Hillewaert H.T. Huynh Norbert Kroll Georg May Per‐Olof Persson Bram van Leer Miguel Visbal 《国际流体数值方法杂志》2013,72(8):811-845
After several years of planning, the 1st International Workshop on High‐Order CFD Methods was successfully held in Nashville, Tennessee, on January 7–8, 2012, just before the 50th Aerospace Sciences Meeting. The American Institute of Aeronautics and Astronautics, the Air Force Office of Scientific Research, and the German Aerospace Center provided much needed support, financial and moral. Over 70 participants from all over the world across the research spectrum of academia, government labs, and private industry attended the workshop. Many exciting results were presented. In this review article, the main motivation and major findings from the workshop are described. Pacing items requiring further effort are presented. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
92.
Jure Grgi? Enrico Campaioli S?ren Raza Paolo Bassi Niels Asger Mortensen 《Optical and Quantum Electronics》2011,42(8):511-519
Coupled resonator optical waveguides (CROW) can significantly reduce light propagation pulse velocity due to pronounced dispersion properties. A number of interesting applications have been proposed to benefit from such slow-light propagation. Unfortunately, the inevitable presence of disorder, imperfections, and a finite Q value may heavily affect the otherwise attractive properties of CROWs. We show how finite a Q factor limits the maximum attainable group delay time; the group index is limited by Q, but equally important the feasible device length is itself also limited by damping resulting from a finite Q. Adding the additional effects of disorder to this picture, limitations become even more severe due to destructive interference phenomena, eventually in the form of Anderson localization. Simple analytical considerations demonstrate that the maximum attainable delay time in CROWs is limited by the intrinsic photon lifetime of a single resonator. 相似文献
93.
94.
Dr. Yuichi Onda Dr. Gabriele Bassi Abdullah Elsayed Franziska Ulrich Sebastian Oehler Louise Plais Dr. Jörg Scheuermann Prof. Dr. Dario Neri 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(24):7160-7167
The synthesis and characterization of a novel DNA-encoded library of macrocyclic peptide derivatives are described; the macrocycles are based on three sets of proteinogenic and non-proteinogenic amino acid building blocks and featuring the use of copper(I)-catalyzed alkyne-azide cycloaddition (CuAAC) reaction for ring closure. The library (termed YO-DEL) which contains 1 254 838 compounds, was encoded with DNA in single-stranded format and was screened against target proteins of interest using affinity capture procedures and photocrosslinking. YO-DEL selections yielded specific binders against serum albumins, carbonic anhydrases and NKp46, a marker of activated Natural Killer cells. 相似文献
95.
Any implementation of the beam propagation method, when used to analyse open problems, requires a procedure allowing radiation to leave the computational window. In this paper we present the results of a case study on the effectiveness of the classical Hadley's Transparent Boundary Conditions (TBC) and the Perfectly Matched Layer (PML) to handle strong radiation at the boundaries. A polished fibre coupler will be studied both in 2D and in 3D configurations using, in the former case, a scalar method and, in the latter, a full vectorial approach. Numerical results show that simple TBC can be used in 2D simulations also when high radiation occurs but they easily fail in 3D structures. Therefore, in these cases, the more complicated PML conditions should be preferred. 相似文献
96.
The finite difference time domain method is used as a tool to model non-linear optical devices. Following this approach, Maxwell's
equations are directly integrated in the time domain, avoiding any mathematical approximation. As an example, spatial soliton
propagation and interaction will be modelled by the FDTD technique. Some new results will be discussed, to highlight the envisaged
breakthroughs allowed by the method.
This revised version was published online in November 2006 with corrections to the Cover Date. 相似文献
97.
A. Boschetti D. Bassi E. Iacob S. Iannotta L. Ricci M. Scotoni 《Applied physics. B, Lasers and optics》2002,74(3):273-278
A compact multi-component trace-gas detector based on the resonant photoacoustic technique and a NIR external cavity diode
laser has been developed. It has been characterized using a mixture of ethylene and methane diluted in ambient air. A spectroscopic
investigation of combination bands and overtones between 5900 and 6250 cm-1, obtained with an IR pulsed laser photoacoustic spectrometer, allowed us to find a wavelength region where the 2ν3 overtone of CH4 and the ν5+ν9 combination band of C2H4 show uncongested rotational lines. Using a single-mode scan of the diode laser in this region, around 6150 cm-1, the sensitivity for the simultaneous detection of ethylene and methane is 8 ppm/mW and 40 ppm/mW respectively. Factors affecting
the sensitivity and selectivity of the detection system and possible improvements suitable to reach the sub-ppm detection
limit are discussed.
Received: 1 August 2001 / Revised version: 28 November 2001 / Published online: 7 February 2002
An erratum to this article is available at . 相似文献
98.
This paper addresses the problem of scheduling jobs in a single machine with sequence dependent setup times in order to minimize
the total tardiness with respect to job due dates. We propose variants of the GRASP metaheuristic that incorporate memory-based
mechanisms for solving this problem. There are two mechanisms proposed in the literature that utilize a long-term memory composed
of an elite set of high quality and sufficiently distant solutions. The first mechanism consists of extracting attributes
from the elite solutions in order to influence the construction of an initial solution. The second one makes use of path relinking
to connect a GRASP local minimum with a solution of the elite set, and also to connect solutions from the elite set. Reactive
GRASP, which probabilistically determines the degree of randomness in the GRASP construction throughout the iterations, is
also investigated. Computational tests for instances involving up to 150 jobs are reported, and the proposed method is compared
with heuristic and exact methods from the literature. 相似文献
99.
N. Andreeva D. Bassi F. Cappa P.S. Cocconcelli F. Parmigiani G. Ferrini 《Micron (Oxford, England : 1993)》2010,41(8):945-952
In this work we report on the measurement of the Young modulus of the external surface of Clostridium tyrobutyricum spores in air with an atomic force microscope. The Young modulus can be reliably measured despite the strong tip-spore adhesion forces and the need to immobilize the spores due to their slipping on most substrates. Moreover, we investigate the disturbing factors and consider some practical aspects that influence the measurements of elastic properties of biological objects with the atomic force microscopy indentation techniques. 相似文献
100.
Zepparelli F. Mezzanotte P. Alimenti F. Roselli L. Sorrentino R. Tartarini G. Bassi P. 《Optical and Quantum Electronics》1999,31(9-10):827-841
Continous advances in material technology, in the field of integrated optics and optoelectronics, allow the realization of devices with geometries more and more compact and complex. Because of this trend, there is a parallel need for accurate fully numerical CAD tools. Among new ones, the FDTD method, already widely and successfully used for the characterization of microwave and millimeter-wave devices, is emerging in optics community because of its accuracy and versatility. However, in spite of the tremendous increase in computing power, the applicability of the method is still limited by the typical dimensions of optical structures. To overcome these limitations a specialized version of the FDTD algorithm for the rigorous analysis of 3D optical and optoelectronic devices is proposed and validated. This new technique is then used to characterize the optical behaviour of a MQW waveguide electroabsorption modulator. 相似文献