4,787 research outputs found
A multi-material virtual prototyping system for biomedical applications
This paper describes a multi-material virtual prototyping (MMVP) system for modelling and digital fabrication of discrete and functionally graded multi-material objects for biomedical applications. The MMVP system consists of a DMMVP module, an FGMVP module, and a virtual reality (VR) simulation module. The DMMVP module is used for design and process planning of discrete multi-material (DMM) objects, while the FGMVP module is for functionally graded multimaterial (FGM) objects. The VR simulation module integrates these two modules to perform digital fabrication of multimaterial objects, which can be subsequently visualized and analyzed in a virtual environment to optimize MMLM processes for fabrication of product prototypes. Using the MMVP system, two biomedical objects, including a human dextrocardic heart made of discrete multi-materials and a hip joint assembly of FGM are modelled and digitally fabricated for visualization and analysis in a VR environment. These studies show the MMVP system is a practical tool for modelling, visualization, process planning, and subsequent fabrication of biomedical objects of discrete and functionally graded multi-materials for biomedical applications. ©2009 IEEE.published_or_final_versionThe IEEE International Conference on Virtual Environments, Human-Computer Interfaces and Measurements Systems (VECIMS) 2009, Hong Kong, 11-13 May 2009. In Proceedings of the IEEE International Conference on Virtual Environments, Human-Computer Interfaces and Measurements Systems, 2009, p. 73-7
Wideband Planarized Dual-Linearly-Polarized Dipole Antenna and Its Integration for Dual-Circularly-Polarized Radiation
© 2002-2011 IEEE. A planarized dual-linearly-polarized (dual-LP) antenna and an integrated dual-circularly-polarized (dual-CP) antenna are proposed in this letter. For the dual-LP antenna, two groups of dipoles are fed by two balun-included feed networks to achieve ±45° polarizations. The feed networks and the radiators are printed on two sides of a substrate, forming a fully planar structure. Taking advantage of its planar configuration, the dual-LP antenna is further integrated with a wideband coupler to realize dual-CP radiation. The coupler is bent and squeezed into the space between the radiators and the reflector, leading to a compact structure. Both the dual-LP antenna and the dual-CP antenna have very stable radiation performances across a wide operating band >66%
Centralizer's applications to the (b, c)-inverses in rings
[EN] We give several conditions in order that the absorption law for one sided (b,c)-inverses in rings holds. Also, by using centralizers, we obtain the absorption law for the (b,c)-inverse and the reverse order law of the (b,c)-inverse in rings. As applications, we obtain the related results for the inverse along an element, Moore-Penrose inverse, Drazin inverse, group inverse and core inverse.This research is supported by the National Natural Science Foundation of China (no. 11771076 and no. 11871301). The first author is grateful to China Scholarship Council for giving him a scholarship for his further study in Universitat Politecnica de Valencia, Spain.Xu, S.; Chen, J.; BenĂtez LĂłpez, J.; Wang, D. (2019). Centralizer's applications to the (b, c)-inverses in rings. Revista de la Real Academia de Ciencias Exactas, FĂsicas y Naturales. 113(3):1739-1746. https://doi.org/10.1007/s13398-018-0574-0S173917461133Baksalary, O.M., Trenkler, G.: Core inverse of matrices. Linear Multilinear Algebra 58(6), 681â697 (2010)BenĂtez, J., Boasso, E.: The inverse along an element in rings with an involution, Banach algebras and C â -algebras. Linear Multilinear Algebra 65(2), 284â299 (2017)BenĂtez, J., Boasso, E., Jin, H.W.: On one-sided ( B , C ) -inverses of arbitrary matrices. Electron. J. Linear Algebra 32, 391â422 (2017)Boasso, E., KantĂșn-Montiel, G.: The ( b , c ) -inverses in rings and in the Banach context. Mediterr. J. Math. 14, 112 (2017)Chen, Q.G., Wang, D.G.: A class of coquasitriangular Hopf group algebras. Comm. Algebra 44(1), 310â335 (2016)Chen, J.L., Ke, Y.Y., MosiÄ, D.: The reverse order law of the ( b , c ) -inverse in semigroups. Acta Math. Hung. 151(1), 181â198 (2017)Deng, C.Y.: Reverse order law for the group inverses. J. Math. Anal. Appl. 382(2), 663â671 (2011)Drazin, M.P.: Pseudo-inverses in associative rings and semigroups. Am. Math. Mon. 65, 506â514 (1958)Drazin, M.P.: A class of outer generalized inverses. Linear Algebra Appl. 436, 1909â1923 (2012)Drazin, M.P.: Left and right generalized inverses. Linear Algebra Appl. 510, 64â78 (2016)Jin, H.W., BenĂtez, J.: The absorption laws for the generalized inverses in rings. Electron. J. Linear Algebra 30, 827â842 (2015)Johnson, B.E.: An introduction to the theory of centralizers. Proc. Lond. Math. Soc. 14, 299â320 (1964)Ke, Y.Y., CvetkoviÄ-IliÄ, D.S., Chen, J.L., ViĆĄnjiÄ, J.: New results on ( b , c ) -inverses. Linear Multilinear Algebra 66(3), 447â458 (2018)Ke Y.Y., ViĆĄnjiÄ J., Chen J.L.: One sided ( b , c ) -inverse in rings (2016). arXiv:1607.06230v1Liu, X.J., Jin, H.W., CvetkoviÄ-IliÄ, D.S.: The absorption laws for the generalized inverses. Appl. Math. Comput. 219, 2053â2059 (2012)Mary, X.: On generalized inverse and Greenâs relations. Linear Algebra Appl. 434, 1836â1844 (2011)Mary, X., PatrĂcio, P.: Generalized inverses modulo H in semigroups and rings. Linear Multilinear Algebra 61(8), 1130â1135 (2013)MosiÄ, D., CvetkoviÄ-IliÄ, D.S.: Reverse order law for the Moore-Penrose inverse in C â -algebras. Electron. J. Linear Algebra 22, 92â111 (2011)RakiÄ, D.S.: A note on Rao and Mitraâs constrained inverse and Drazinâs ( b , c ) -inverse. Linear Algebra Appl. 523, 102â108 (2017)RakiÄ, D.S., DinÄiÄ, N.Ä., DjordjeviÄ, D.S.: Group, MooreâPenrose, core and dual core inverse in rings with involution. Linear Algebra Appl. 463, 115â133 (2014)Wang, L., Castro-GonzĂĄlez, N., Chen, J.L.: Characterizations of outer generalized inverses. Can. Math. Bull. 60(4), 861â871 (2017)Wei, Y.M.: A characterization and representation of the generalized inverse A T , S ( 2 ) and its applications. Linear Algebra Appl. 280, 87â96 (1998)Xu, S.Z., BenĂtez, J.: Existence criteria and expressions of the ( b , c ) -inverse in rings and its applications. Mediterr. J. Math. 15, 14 (2018)Zhu, H.H., Chen, J.L., PatrĂcio, P.: Further results on the inverse along an element in semigroups and rings. Linear Multilinear Algebra 64(3), 393â403 (2016)Zhu, H.H., Chen, J.L., PatrĂcio, P.: Reverse order law for the inverse along an element. Linear Multilinear Algebra 65, 166â177 (2017)Zhu, H.H., Chen, J.L., PatrĂcio, P., Mary, X.: Centralizerâs applications to the inverse along an element. Appl. Math. Comput. 315, 27â33 (2017)Zhu, H.H., Zhang, X.X., Chen, J.L.: Centralizers and their applications to generalized inverses. Linear Algebra Appl. 458, 291â300 (2014
Suppression of Cross-Band Scattering in Multiband Antenna Arrays
© 1963-2012 IEEE. This paper presents a novel method of suppressing cross-band scattering in dual-band dual-polarized antenna arrays. The method involves introducing chokes into low-band (LB) elements to suppress high-band (HB) scattering currents. The experimental results show that by inserting LB-pass HB-stop chokes into LB radiators, suppression of induced HB currents on the LB elements is achieved. This greatly reduces the pattern distortion of the HB array caused by the presence of LB elements. The array considered is configured as two columns of HB antennas operating from 1.71 to 2.28 GHz interleaved with a single column of LB antennas operating from 0.82 to 1.0 GHz. The realized array with choked LB element has stable and symmetrical radiation in both HB and LB
The one-sided inverse along an element in semigroups and rings
The concept of the inverse along an element was introduced by Mary in 2011. Later, Zhu et al. introduced the one-sided inverse along an element. In this paper, we first give a new existence criterion for the one-sided inverse along a product and characterize the existence of MooreâPenrose inverse by means of one-sided invertibility of certain element in a ring. In addition, we show that aâ S â â S # if and only if (aâa)k is invertible along a if and only if (aaâ)k is invertible along a in a â -monoid S, where k is an arbitrary given positive integer. Finally, we prove that the inverse of a along aa â coincides with the core inverse of a under the condition aâ S { 1 , 4 } in a â -monoid S.FCT - Fuel Cell Technologies Program(CXLX13-072)This research was supported by the National Natural Science Foundation
of China (No. 11371089), the Specialized Research Fund for the Doctoral Program of
Higher Education (No. 20120092110020), the Natural Science Foundation of Jiangsu Province
(No. BK20141327) and the Foundation of Graduate Innovation Program of Jiangsu Province
(No. KYZZ15-0049).info:eu-repo/semantics/publishedVersio
Kinetic analysis of an enzyme-containing polymer modified electrode
A theoretical model for enzyme-entrapped conducting polymer modified electrodes is proposed and appropriate expressions are derived for the steady-state current response of the enzyme electrode. More attention has been paid to the role of conducting polymer in electron transfer and the effect of mass transport. On the basis of kinetic analysis, the performance and optimum design of the second and third generation enzyme electrodes are discussed
Data Fusion of Objects Using Techniques Such as Laser Scanning, Structured Light and Photogrammetry for Cultural Heritage Applications
In this paper we present a semi-automatic 2D-3D local registration pipeline
capable of coloring 3D models obtained from 3D scanners by using uncalibrated
images. The proposed pipeline exploits the Structure from Motion (SfM)
technique in order to reconstruct a sparse representation of the 3D object and
obtain the camera parameters from image feature matches. We then coarsely
register the reconstructed 3D model to the scanned one through the Scale
Iterative Closest Point (SICP) algorithm. SICP provides the global scale,
rotation and translation parameters, using minimal manual user intervention. In
the final processing stage, a local registration refinement algorithm optimizes
the color projection of the aligned photos on the 3D object removing the
blurring/ghosting artefacts introduced due to small inaccuracies during the
registration. The proposed pipeline is capable of handling real world cases
with a range of characteristics from objects with low level geometric features
to complex ones
Effect of additional food waste slurry generated by mesophilic acidogenic fermentation on nutrient removal and sludge properties during wastewater treatment
© 2019 Elsevier Ltd Fermentation slurry from food waste (FSFW) generated by acidogenic fermentation at mesophilic temperature was utilized to improve the nutrients removal from wastewater. Organic acids (such as lactate and volatile fatty acids) in the FSFW behaved as readily biodegradable carbon sources, while the particulate and macromolecular organics acted as slowly biodegradable carbon sources during denitrification processes. The FSFW dosage significantly influenced the nitrogen removal performance, and a C/N ratio (in terms of chemical oxygen demand to nitrogen ratio) of 8 could achieve complete denitrification in the batch tests. In a sequencing batch reactor (SBR) using FSFW for long-term wastewater treatment, extracellular polymeric substances (EPS) gradually accumulated, sludge particle size significantly increased, and microbial communities were selectively enriched, which contributed to promoting the nitrogen (>80%) and phosphate (90.1%) removal efficiencies. Overall, the FSFW produced by acidogenic fermentation under mesophilic temperature served as an excellent intermediary between FW valorization and wastewater treatment
Quasi-static stop band with flexural metamaterial having zero rotational stiffness
Metamaterials realizing stop bands have attracted much attentions recently since they can break-through the well-known mass law. However, achieving the stop band at extremely low frequency has been still a big challenge in the fields of elastic metamaterials. In this paper, we propose a new metamaterial based on the idea of the zero rotational stiffness, to achieve extremely low frequency stop band for flexural elastic waves. Unlike the previous ways to achieve the stop band, we found that the zero rotational stiffness can provide a broad stop band at extremely low frequency, which starts from even almost zero frequency. To achieve the zero rotational stiffness, we propose a new elastic metamaterial consisting of blocks and links with the hinge connection. Analytic developments as well as numerical simulations evidence that this new metamaterial can exhibit extremely low and broad stop band, even at the quasi-static ranges. In addition, the metamaterial is shown to exhibit the negative group velocity at extremely low frequency ranges, as well as the quasi-static stop band, if it is properly designed.ope
Monitoring and analysis of internal displacements of a slope and relationship with rainfall infiltration
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