Antonín Mikš  Jiří Novák  Pavel Novák 《International journal for numerical methods in engineering》2010,82(4):525-536

The quadrature of general, highly oscillatory integrals is a relatively complicated computational problem that occurs in a wide range of practical applications, e.g. in physics, chemistry, and image analysis. It is often necessary to use a high number of nodal points with classical quadrature formulas in order to achieve a required accuracy of numerical integration of rapidly oscillating functions. However, an increase in integration points leads to a larger computational time. Our work describes and analyses a method for numerical integration of rapidly oscillating functions, which enables to obtain the required accuracy with a smaller number of nodal points than classical integration rules and with a relatively simple integration formula. The proposed method is generally suitable for integration of rapidly oscillating functions in various applications. The method is demonstrated in examples of calculation of the diffraction integral in optics, where the integrand is often a rapidly oscillatory function. The results can be readily adapted to similar problems from other fields. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献   

    

M. Tkáč  Š. Lyócsa 《Quality and Reliability Engineering International》2010,26(1):115-124

Most of the research on the success in implementing Six Sigma agrees upon the fact that one of the key success factors is the selection of profitable projects. This seems to be especially important for high‐risk, large‐scope and long‐term projects, as is mostly the case in the design for Six Sigma projects. The purpose of this paper is to outline Six Sigma project characteristics and to present a new model for evaluating Six Sigma projects. To design a Six Sigma project evaluation model, we utilized mathematical optimization modeling techniques and real options theory. The model allows for the quantification of not only the project's value prior to its start but also its progress and the consideration of possible decisions based on this progress. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献   

    

I. Siró  D. Plackett  P. Sommer‐Larsen 《Packaging Technology and Science》2010,23(6):301-315

Information on oxygen permeability through polymer films is essential for some applications, especially in food packaging where the control of oxygen levels can be critical in avoiding food spoilage. A permeability testing device using fluorescence‐based optical oxygen sensing was developed as a potential new instrument for measuring the oxygen permeability of packaging films. The fluorescence‐based permeability tester was validated against two existing commercial oxygen permeability measuring devices, the Mocon Ox‐Tran 2/20 and PBI‐Dansensor OPT‐5000. Oxygen transmission rates (OTR) of polylactide (PLA) and nanoclay‐reinforced PLA films, as well as polyethylene/poly(ethylene terephthalate) (PE/PET) and polypropylene/poly(ethylene terephthalate) (PP/PET) laminated films were determined at 23°C and 50% relative humidity using each of these instruments. No significant differences were observed between mean OTR values obtained by the fluorescence method and the corresponding values obtained using the OPT‐5000 but significantly lower values were measured when using the Mocon Ox‐Tran 2/20. In general, oxygen permeability data for the tested films were within the range of values found in the literature; however, in terms of further development, the fluorescence‐based technique gave OTR with relatively high standard deviation compared to the commercial methods and equipment modifications to address this issue are considered desirable. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   

    

E. Solórzano  M. A. Rodríguez‐Perez  J. A. Reglero  J. A. de Saja 《Advanced Engineering Materials》2007,9(11):955-958

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Grimm D  Venezuela P  Banhart F  Grobert N  Terrones H  Ajayan PM  Terrones M  Latgé A 《Small (Weinheim an der Bergstrasse, Germany)》2007,3(11):1900-1905

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Valentini L  Mengoni F  Kenny JM  Marrocchi A  Taticchi A 《Small (Weinheim an der Bergstrasse, Germany)》2007,3(7):1200-1203

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Rodríguez-Manzo JA  López-Urías F  Terrones M  Terrones H 《Small (Weinheim an der Bergstrasse, Germany)》2007,3(1):120-125

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Mario Siewert  Markus E. Gruner  Alfred Hucht  Heike C. Herper  Antje Dannenberg  Aparna Chakrabarti  Navdeep Singh  Raymundo Arróyave  Peter Entel 《Advanced Engineering Materials》2012,14(8):530-546

The interplay of structural and magnetic properties of magnetic shape memory alloys is closely related to their composition. In this study the influence of the valence electron concentration on the tetragonal transformation in Ni₂Mn_{1 + x}Z_{1 ? x} (Z = Ga, In, Sn, Sb) and Co₂Ni_{1 + x}Ga_{1 ? x} is investigated by means of ab initio calculations. While the type of magnetic interaction is different for the two series, the trends of the total energy changes under a tetragonal transformation are very similar. We find that tetragonal structures become energetically preferred with respect to the cubic one as the valence electron concentration e/a is increased regardless of the system under consideration. In particular, the energy difference between the austenite and martensite structures increases linearly with e/a, which is in part responsible for the linear increase of the matensite transformation temperature. The substitution of nickel by platinum increases even further the transformation temperature.  相似文献   

    

Simmchen J  Baeza A  Ruiz D  Esplandiu MJ  Vallet-Regí M 《Small (Weinheim an der Bergstrasse, Germany)》2012,8(13):2053-2059

An innovative self-propelled nanodevice able to perform motion, cargo transport, and target recognition is presented. The system is based on a mesoporous motor particle, which is asymmetrically functionalized by the attachment of single-stranded DNA onto one of its faces, while catalase is immobilized on the other face. This enzyme allows catalytic decomposition of hydrogen peroxide to oxygen and water, giving rise to the driving force for the motion of the whole system. Moreover the motor particles are able to capture and transport cargo particles functionalized with a noncomplementary single-stranded DNA molecule, only if a specific oligonucleotide sequence is present in the media. Functionalization with characteristic oligonucleotide sequences in the system implies a potential for further developments for lab-on-chip devices with applications in biomedical applications.  相似文献   

    

Caumes JP  Younus A  Salort S  Chassagne B  Recur B  Ziéglé A  Dautant A  Abraham E 《Applied optics》2011,50(20):3604-3608

A monochromatic millimeter-wave imaging system coupled with an infrared temperature sensor has been used to investigate historic objects preserved at the Museum of Aquitaine (France). In particular, two-dimensional and three-dimensional analyses have been performed in order to reveal the internal structure of nearly 3500-year-old sealed Egyptian jars.  相似文献