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  • What are the optimum ultrasonic guided wave modes

    2017-3-20 · guided waves brings thorough understanding of governing mechanisms of the wave propa-gation when it interacts with structural features and has been used as a major tool in scientific community. One of the prime requirements of the guided wave SHM approach is to deploy actuators/sensors for determining the known damage size.

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  • INTEGRATED APPROACH TO DEMONSTRATE OPTIMUM

    Guided waves are of enormous interest in the nondestructive evaluation of thin-walled structures and layered media. Due to their dispersive and multi-modal nature, it is desirable to tune the waves by discriminating one mode from the others. ... to provide suggestions and guidelines for selecting optimum tuning parameters. In order to remedy ...

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  • Analysis of optimum Lamb wave tuning -

    2016-4-1 · The focus of this paper is to investigate the optimum topology of PhCr plate (PhP) unitcell with 2D periodicity for maximized bandgap width of guided waves. Guided waves are structural waves confined by traction free surfaces of thin walled structures, so called plate waves when guided …

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  • Optimum design of phononic crystal perforated plate ...

    2016-10-28 · Ultrasonic Guided Waves can propagate over long distances, and are thus suitable for the interrogation of long structural members such as rails. A recently developed Ultrasonic Broken Rail Detection (UBRD) system for monitoring continuously welded train rail tracks, primarily detects complete breaks. This system uses a guided wave

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  • Optimal Design of a Guided Wave Rail Web Transducer

    PDF | On Nov 1, 2016, R. Sridaran Venkat and others published Integrated approach to demonstrate optimum sensor positions in a guided wave based SHM system using numerical simulation | Find, read ...

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  • (PDF) Integrated approach to demonstrate optimum

    2004-12-1 · Attenuation of the fundamental torsional guided waves in a coal-tar-enamel-coated pipe was investigated experimentally over a 5–30-kHz frequency range and up to a 1.7-m soil cover. The attenuation coefficients in the coated pipe above the ground were an order of magnitude greater than in bare pipe and, over the frequency range studied, it increased approximately linearly with frequency.

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  • Torsional guided-wave attenuation in coal-tar-enamel ...

    2021-4-19 · Here, the structure is excited in a suitable mode shape and additionally guided waves are send through the structure.

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  • 25 questions with answers in GUIDED WAVES |

    2015-7-26 · Chapter 3 deals with plane waves in homogeneous isotropic, anisotropic, and ferrite media. The transmission line theory for propagation through a multilayered medium is developed. The new material added to this chapter is on dyadic Green's functions for layered media, which is important for many current problems associated with planar transmission lines and microstrip patch resonators.

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  • Optimum Cable TV Channel Guide | Optimum

    Optimum.net is compatible with a wide range of browsers. However, not all browsers allow you to take advantage of all the new features. We strongly recommend that you upgrade to a more current browser. You need to change your Internet Explorer Compatibility View setting to get the most from the new Optimum…

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  • Generation and detection of guided waves using PZT

    2012-2-12 · model [9]. In addition, we are able to determine the optimum PZT wafer thickness. Finally, this approach is readily adapted to explore the interactions of waves with flaws and edge attachments. In the following section we report simulations of the emission of guided waves using both the point-source and PZT sources.

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  • Analysis of optimum Lamb wave tuning -

    Guided waves are of enormous interest in the nondestructive evaluation of thin-walled structures and layered media. Due to their dispersive and multi-modal nature, it is desirable to tune the waves by discriminating one mode from the others. ... to provide suggestions and guidelines for selecting optimum tuning parameters. In order to remedy ...

    Get Price
  • Dispersion-Engineered Guided-Wave Resonators in ...

    2019-3-22 · Various proof-of-concept resonators, representing guided waves with different dispersion types, are presented and compared to highlight the optimum design procedures for Q enhancement and spurious mode suppression. Part I of this paper presents the operation principle of guided wave resonators based on analytical derivation of dispersion ...

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  • Guided Wave Based Crack Detection in the Rivet Hole

    2016-7-21 · waves. The scattered guided waves propagate in the structures and are received by the piezoelectric sensor. The actuator dispatches Lamb waves to each of the rivet holes at a certain angle that can be calculated from the standoff distance (L) and pitch (P) …

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  • Second harmonic generation with surface guided

    The nonlinear mixing of two oppositely propagating waves can be used to perform the convolution of two waveforms. We have examined the nonlinear cross sections for this interaction based on waves guided by both dielectric and metal films. The numerical analysis shows that optimum efficiencies are obtained with dielectric film guided waves and that useful cross sections can be obtained with ...

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  • Piezoelectric Wafer Active Sensors for Structural Health ...

    2012-1-13 · guided waves in composites and shows how the concept of guided wave tuning with PWAS can be applied in the case of composite structures: theoretical predictions and experimental results of PWAS-guided waves tuning in a composite plate are compara-tively presented. Subsequently, the paper gives a brief presenta-

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  • The anisotropic propagation of ultrasonic guided

    Ultrasonic guided wave propagation in anisotropic attenuative materials like CFRP (carbon fibre reinforced polymer) is much more complicated than in isotropic materials. Propagation phenomena need to be understood and quantified before reliable NDE (Non-destructive Evaluation)/SHM (Structural Health …

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  • Health Monitoring of Rock Bolts Using Ultrasonic Guided

    2006-3-21 · HEALTH MONITORING OF ROCK BOLTS USING ULTRASONIC GUIDED WAVES C. He1, J. K. Van Velsor 2, C. M. Lee , and J. L. Rose2 1Beijing University of Technology, Beijing, 100022 2The Pennsylvania State University, University Park, PA 16802 U.S. ABSTRACT. It is necessary to quantify the amount of delamination present in load bearing rock bolts,

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  • Wireless Power Transmission Using Ultrasonic Guided

    A project investigating the possibility to transmit electrical power (several mW) along the structure of an aircraft by using an intermediate medium of ultrasonic Lamb waves is being carried out at Cardiff University in conjunction with Airbus. This power supply method is aimed at wireless, surface-bonded sensor packages, primarily for the aircraft structural health monitoring (SHM) applications.

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  • 'USING GUIDED P-WAVES TO OBTAIN A HIGH

    A 2D P-wave velocity model of the near surface was created from fundamental mode dispersion curve trends of guided P-wave phase velocities. The fundamental mode of the dispersion curve trends was identified at a majority of geophone locations in our data set. Each of these geophones was selected as the central geophone within an optimum window (aperture), providing a laterally varying set of ...

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  • Long Term Guided Wave Monitoring of Offshore

    Cawley P & Alleyne DN, 'The use of Lamb Waves for the Long-Range Inspection of Large Structures', Proceedings of Ultrasonics International 95, published in Ultrasonics, Vol. 34, pp287-290, 1996. Mudge P J, 'Practical Enhancements Achievable in Long Range Ultrasonic Testing by Exploiting the Properties of Guided Waves', proceedings of the 16th ...

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  • Applications of Guided Waves to Nonlinear Optics

    GUIDED WAVES IN NONLINEAR OPTICS 325 reduced. In a prism of refractive index np, for example, optimum coupling is usually obtained when light is incident through the prism at an angle 6 to the surface normal such that = nk sin 0. If,8 depends on guided wave power, this synchronous coupling condition is lost and coupling efficiency falls ...

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  • (PDF) Optimum primary and supplementary signals

    Journal of Applied Geophysics 46 Ž2001. 175–187 www.elsevier.nlrlocaterjappgeo Optimum primary and supplementary signals optimizing the seismic data resolution Yuriy K. Tyapkin Ukrainian State Geological Prospecting Institute, 78 AÕtozaÕodskaya St., KieÕ, 04114, Ukraine Received 1 September 1999; accepted 29 January 2001 Abstract Often in practice, when generating seismic waves on a line ...

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  • PK GUIDED OPTIMUM ADAPTIVE CLINICAL TRIALS OF

    2014-3-27 · PK GUIDED OPTIMUM ADAPTIVE CLINICAL TRIALS OF EARLY PHASES Barbara Bogacka Queen Mary, University of London In collaboration with Iftakhar Alam and D. Steven Coad. 1/33. Introduction Population PK Approach Model with Random Effects Optimality Criterion Dose-Response Model Adaptive Design Dose Selection Criteria Stopping Rules

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  • Health Monitoring of Rock Bolts Using Ultrasonic Guided

    2006-3-21 · HEALTH MONITORING OF ROCK BOLTS USING ULTRASONIC GUIDED WAVES C. He1, J. K. Van Velsor 2, C. M. Lee , and J. L. Rose2 1Beijing University of Technology, Beijing, 100022 2The Pennsylvania State University, University Park, PA 16802 U.S. ABSTRACT. It is necessary to quantify the amount of delamination present in load bearing rock bolts,

    Get Price
  • Molding free-space light with guided wave–driven ...

    Off-chip beam deflection and focusing with an integrated guided wave–driven metasurface. According to Eq. 1, the linear momentum of extracted light along x direction is kx = β + ∂Δϕ ( x )/∂ x. If ∂Δϕ ( x )/∂ x is a constant, the extracted beam has a well-defined angle θ given by θ = …

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  • The optimum optical penetration depth for high

    In guided acousto-optic interaction, diffraction efficiency is a strong function of the overlap integral. Overlap integral with different optical penetration depth is analyzed theoretically. The optimum penetration depth is obtained for high diffraction efficiency.

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  • Optimum grasp planner and vision‐guided grasping

    2005-2-1 · Optimum grasp planner and vision‐guided grasping using a three‐finger hand Optimum grasp planner and vision‐guided grasping using a three‐finger hand E. Boivin; I. Sharf 2005-02-01 00:00:00 Purpose – The capability to perform dexterous operations in an autonomous manner would greatly enhance the productivity of robotic operations.

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  • Predicting bone strength with ultrasonic guided waves ...

    2017-3-3 · On ultrasound waves guided by bones with coupled soft tissues: A mechanism study and in vitro calibration. Ultrasonics 54 , 1186–1196 (2014). PubMed Google Scholar

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  • Long Term Guided Wave Monitoring of Offshore

    Cawley P & Alleyne DN, 'The use of Lamb Waves for the Long-Range Inspection of Large Structures', Proceedings of Ultrasonics International 95, published in Ultrasonics, Vol. 34, pp287-290, 1996. Mudge P J, 'Practical Enhancements Achievable in Long Range Ultrasonic Testing by Exploiting the Properties of Guided Waves', proceedings of the 16th ...

    Get Price
  • Applications of Guided Waves to Nonlinear Optics

    GUIDED WAVES IN NONLINEAR OPTICS 325 reduced. In a prism of refractive index np, for example, optimum coupling is usually obtained when light is incident through the prism at an angle 6 to the surface normal such that = nk sin 0. If,8 depends on guided wave power, this synchronous coupling condition is lost and coupling efficiency falls ...

    Get Price
  • Ultrasonic high-frequency guided waves for the

    2019-7-23 · With optimum transducer position, the high-frequency guided waves are also used to inspect the artificially introduced defects in the connecting weld of shell support plate. It has been demonstrated that the high-frequency guided wave could detect defects of …

    Get Price
  • Finite Element Method for Guided Wave Mechanics

    Ultrasonic guided waves focused beyond welds in pipeline, Proceedings of QNDE, August, 25: 877–84. Zhao , X. , and Zhang , L. ( 2008 ). Finite element analysis of ultrasonic surface waves for crack inspection on an engine rotor disk , Journal of Material Evaluation 66 : 67–72.

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  • Defect localization by an extended laser source on a ...

    2021-7-26 · We studied guided waves generated by a point source, their propagation on an intact sample, and their interaction with a circular defect. ... The shortest optimum …

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  • Acousto-Optic Modulator Driven by Surface Acoustic Waves

    2015-1-20 · as a planar optical waveguide, and the optical guided wave in the thin lm is di racted by the WSA launched from an interdigital transducer (IDT). In this case, too, a material with a large FOM can be used as the thin lm. In 1982, saiT reported such an AOM driven by a WSA using optical guided waves in a Ti-di used crossed-channel waveguide on Y ...

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  • Structural health monitoring for delamination detection ...

    Structural health monitoring (SHM) is employed to analyse the condition of a structure.4-6 It is usually considered as part of a predictive maintenance strategy.7-9 The objective is to extend the life cycle of the analysed system and prevent the triggering of critical failures, resulting in less cost and downtimes. Seventy‐five per cent of the annual downtime in WTs is caused by only 15% of ...

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  • Ultrasound-Guided Attenuation Parameter

    2020-6-17 · Ultrasound-Guided Attenuation Parameter LOGIQ™ E10 and LOGIQ E10s Introduction The prevalence of non-alcoholic fatty liver disease (NAFLD) is growing worldwide with the increase in obesity.1 Among the many forms of NAFLD, non-alcoholic …

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  • Applications of Guided Waves to Nonlinear Optics

    GUIDED WAVES IN NONLINEAR OPTICS 325 reduced. In a prism of refractive index np, for example, optimum coupling is usually obtained when light is incident through the prism at an angle 6 to the surface normal such that = nk sin 0. If,8 depends on guided wave power, this synchronous coupling condition is lost and coupling efficiency falls ...

    Get Price
  • Finite Element Method for Guided Wave Mechanics

    Ultrasonic guided waves focused beyond welds in pipeline, Proceedings of QNDE, August, 25: 877–84. Zhao , X. , and Zhang , L. ( 2008 ). Finite element analysis of ultrasonic surface waves for crack inspection on an engine rotor disk , Journal of Material Evaluation 66 : 67–72.

    Get Price
  • Ultrasonic high-frequency guided waves for the

    2019-7-23 · With optimum transducer position, the high-frequency guided waves are also used to inspect the artificially introduced defects in the connecting weld of shell support plate. It has been demonstrated that the high-frequency guided wave could detect defects of …

    Get Price
  • (PDF) Study on Excitation Frequency of Longitudinal

    Effect of guided wave frequency on inspection [5] P. J. Mudge, Ultrasonic guided wave Long Range Ultrasonic performance was studied taking the example of Testing Technique - Performance Details, REPORT: longitudinal guided wave L (0, 2). The optimum frequency TTP/01, May 2001 could be used as the experimental frequency of guided [6] P. J. Mudge ...

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  • Surface Electromagnetic Waves at Gradual Interfaces ...

    2021-6-3 · Such a surface wave may be guided by a seafloor-seawater interface and it may be used in radio communication and imaging underwater. It should allow communication distances of the order of 500 m at 10 kHz along a sandy seabed. Similar surface waves may also be guided by various tissue boundaries inside a human body.

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  • Randomized study defining the optimum target

    2020-7-30 · Thus, the P-value for the primary endpoint of first-pass isolation (P = 0.000000067) is well below even the most conservative statistical stopping boundaries. 8, 9. Results Study population. Here, we report on 42 consecutive patients included (18 paroxysmal AF, 24 persistent AF) and 84 ipsilateral PV pairs encircled according to the study protocol.

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  • Ultrasound-Guided Attenuation Parameter

    2020-6-17 · Ultrasound-Guided Attenuation Parameter LOGIQ™ E10 and LOGIQ E10s Introduction The prevalence of non-alcoholic fatty liver disease (NAFLD) is growing worldwide with the increase in obesity.1 Among the many forms of NAFLD, non-alcoholic …

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  • HackTheBox Optimum Walkthrough - Guided Hacking

    2021-6-15 · Let's try to obtain some information about the HTB Optimum machine by using nmap: sudo nmap -p 1-5000 -sV -sC -v 10.10.10.8 We can see that a HttpFileServer httpd 2.3 is running on port 80 and the operating system installed is some sort of Microsoft …

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  • GitHub - Teradata/covalent-guided-tour-nightly

    2020-11-10 · Contribute to Teradata/covalent-guided-tour-nightly development by creating an account on GitHub.

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    Optimum Virtual Solutions provides an extended arm of marketing support services to assist non- and for-profit organizations in achieving their business goals. Our virtual assistant business model, provides a wide range of services from a remote location, leveraging the power of the Internet to help to improve organizational efficiency, maximize growth, and attain breakthrough business ...

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