F. Twyman, F. R. S.; metal spectroscopy

Schmidt, Rachel

doi:10.1016/0371-1951(52)80049-9

Cited by 2 publications

(2 citation statements)

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“…Also, the conversion of TiO 2 nanotubes to semimetallic TiO x C y , by thermal treatment in an acetylene atmosphere, or to TiN nanotubes, by a high temperature treatment in NH 3 , drastically changes the electronic properties of the starting material to a semimetallic nature and also improves its mechanical stability. 200,201 Most recently, high pressure hydrogenation 202 as well as high-energy proton 203 76,78,79,81,205 In particular, in optimally doped and annealed TiO 2 tubes, both Nb and Ta act as electron donors and hence increase the electron conductivity of the NT layers. This was e.g.…”

Section: Tube Morphology and Optical And Electronic Propertiesmentioning

confidence: 99%

Aligned metal oxide nanotube arrays: key-aspects of anodic TiO₂nanotube formation and properties

et al. 2016

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A B S T R A C TOver the past ten years, self-aligned TiO 2 nanotubes have attracted tremendous scientific and technological interest due to their anticipated impact on energy conversion, environment remediation and biocompatibility. In the present manuscript, we review fundamental principles that govern the self-organized initiation of anodic TiO 2 nanotubes. We start with the fundamental question: Why is self-organization taking place? We illustrate the inherent key mechanistic aspects that lead to tube growth in various different morphologies, such as rippled-walled tubes, smooth tubes, stacks and bamboo-type tubes, and importantly the formation of double-walled TiO 2 nanotubes versus single-walled tubes, and the drastic difference in their physical and chemical properties. We show how both double-and single-walled tube layers can be detached from the metallic substrate and exploited for the preparation of robust self-standing membranes.Finally, we show how by selecting the "right" growth approach to TiO 2 nanotubes specific functional features can be significantly improved, e.g., an enhanced electron mobility, intrinsic doping, or crystallization into pure anatase at extremely high temperatures can be achieved. This in turn can be exploited in constructing high performance devices based on anodic TiO 2 in a wide range of applications.

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Section: Tube Morphology and Optical And Electronic Propertiesmentioning

confidence: 99%

Aligned metal oxide nanotube arrays: key-aspects of anodic TiO₂nanotube formation and properties

et al. 2016

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“…KF has been successfully applied to a wide variety of control problems, for example, signal filtering, subject tracking, system control, and so forth. Besides, it has also been extensively applied in parameter identification problems in which a set of model parameters is considered as the system states and observed through model‐predicted response.…”

Section: Introductionmentioning

confidence: 99%

Online structural damage identification technique using constrained dual extended Kalman filter

Sen

Bhattacharya

2016

Struct. Control Health Monit.

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Periodic health assessment of large civil engineering structures is an effective way to ensure safe performance all through their service lives. Dynamic response-based structural health assessment can only be performed under normal/ambient operating conditions. Existing Kalman filter-based parameter identification algorithms that consider parameters as the only states require the measurements to be sufficiently clean in order to achieve precise estimation. On the other hand, appending parameters in an extended state vector in order to jointly estimate states and parameters is reported to have convergence issues. In this article, a constrained version of the dual extended Kalman filtering (cDEKF) technique is employed in which two concurrent extended Kalman filters simultaneously filter the measurement response (as states) and estimate the elements of state transition matrix (as parameters). Constraints are placed on stiffness and damping parameters during the estimation of the gain matrix to ensure they remain within realistic bounds. The proposed method is compared against the existing Kalman filter-based parameter identification techniques on a three-degrees-of-freedom mass-spring-damper system adopting both unconstrained and constrained estimation approaches. cDEKF is then employed on a numerical six-story shear frame and a 3D space truss to validate its robustness and efficacy in identifying structural damage. The results suggest that cDEKF algorithm is an efficient online damage identification scheme that makes use of ambient vibration response. KEYWORDSdual extended Kalman filter, constrained Kalman filter, online damage detection, structural health monitorin 1 Struct Control Health Monit. 2017;24:e1961. wileyonlinelibrary.com/journal/stc

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F. Twyman, F. R. S.; metal spectroscopy

Cited by 2 publications

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Aligned metal oxide nanotube arrays: key-aspects of anodic TiO₂nanotube formation and properties

Aligned metal oxide nanotube arrays: key-aspects of anodic TiO₂nanotube formation and properties

Online structural damage identification technique using constrained dual extended Kalman filter

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F. Twyman, F. R. S.; metal spectroscopy

Cited by 2 publications

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Aligned metal oxide nanotube arrays: key-aspects of anodic TiO2nanotube formation and properties

Aligned metal oxide nanotube arrays: key-aspects of anodic TiO2nanotube formation and properties

Online structural damage identification technique using constrained dual extended Kalman filter

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Aligned metal oxide nanotube arrays: key-aspects of anodic TiO₂nanotube formation and properties

Aligned metal oxide nanotube arrays: key-aspects of anodic TiO₂nanotube formation and properties