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Penile inversion through a penoscrotal incision for the treatment of penile urethral strictures
Jonathan N Warner,James M Tracey,Ali A Zhumkhawala,Kevin G. Chan,Clayton S. Lau 대한비뇨의학회 2016 Investigative and Clinical Urology Vol.57 No.2
Purpose: This article describes a novel technique for the repair of penile urethral strictures and establishes the safety, feasibility, and efficacy of this innovative surgical approach. Materials and Methods: Patients with urethral strictures underwent a one-sided anterior dorsal oral mucosal graft urethroplasty through a penoscrotal inversion technique. The clinical outcome was considered a failure when any instrumentation was needed postoperatively, including dilatation. Results: Five patients underwent the novel procedure. The patients' mean age was 58 years. The cause of stricture was instrumentation in 2 cases (40%), lichen sclerosis in 1 case (20%), and failed hypospadias repair in 2 cases (40%). The mean stricture length was 3 cm. The overall mean (range) follow-up was 6 months (range, 3–9 months). Of the 5 patients, 4 (80%) had a successful outcome and 1 (20%) had a failed outcome. The failure was successfully treated by use of a meatotomy. Conclusions: The penile inversion technique through a penoscrotal incision is a viable option for the management of penile urethral strictures with several advantages to other techniques: namely, no penile skin incision, a single-stage operation, and supine positioning.
The Value of Stiffness Measured in Field Seismic Surveys
C. R I Clayton,G Heymann,M C Matthews 한국지반공학회 2012 international journal of geo-engineering Vol.4 No.2
Stiffness parameters are required for many geotechnical calculations, including numerical modelling using the finite element or finite difference methods. The measurement of stiffness is not trivial, yet the actual values of stiffness adopted during analyses can have a very significant impact on predictions, and hence the perceived viability of a project. Measurement of stiffness in the laboratory is now well established, using techniques such as advanced triaxial testing with local strain measurement, cyclic triaxial testing, and the resonant column apparatus. Field geophysical techniques, although not as well established, can add significantly to the determination of input parameters for deformation analyses and prediction. This paper considers the strengths and weaknesses of these methods, using examples from a range of projects and ground conditions, and discusses how seismic geophysics can most effectively contribute.
Damage state evaluation of experimental and simulated bolted joints using chaotic ultrasonic waves
T. R. Fasel,M. B. Kennel,M. D. Todd,E. H. Clayton,G. Park 국제구조공학회 2009 Smart Structures and Systems, An International Jou Vol.5 No.4
Ultrasonic chaotic excitations combined with sensor prediction algorithms have shown the ability to identify incipient damage (loss of preload) in a bolted joint. In this study we examine a physical experiment on a single-bolt aluminum lap joint as well as a three-dimensional physics-based simulation designed to model the behavior of guided ultrasonic waves through a similarly configured joint. A multiple bolt frame structure is also experimentally examined. In the physical experiment each signal is imparted to the structure through a macro-fiber composite (MFC) patch on one side of the lap joint and sensed using an equivalent MFC patch on the opposite side of the joint. The model applies the waveform via direct nodal displacement and ‘senses’ the resulting displacement using an average of the nodal strain over an area equivalent to the MFC patch. A novel statistical classification feature is developed from information theory concepts of cross-prediction and interdependence. This damage detection algorithm is used to evaluate multiple damage levels and locations.
Damage state evaluation of experimental and simulated bolted joints using chaotic ultrasonic waves
Fasel, T.R.,Kennel, M.B.,Todd, M.D.,Clayton, E.H.,Park, G. Techno-Press 2009 Smart Structures and Systems, An International Jou Vol.5 No.4
Ultrasonic chaotic excitations combined with sensor prediction algorithms have shown the ability to identify incipient damage (loss of preload) in a bolted joint. In this study we examine a physical experiment on a single-bolt aluminum lap joint as well as a three-dimensional physics-based simulation designed to model the behavior of guided ultrasonic waves through a similarly configured joint. A multiple bolt frame structure is also experimentally examined. In the physical experiment each signal is imparted to the structure through a macro-fiber composite (MFC) patch on one side of the lap joint and sensed using an equivalent MFC patch on the opposite side of the joint. The model applies the waveform via direct nodal displacement and 'senses' the resulting displacement using an average of the nodal strain over an area equivalent to the MFC patch. A novel statistical classification feature is developed from information theory concepts of cross-prediction and interdependence. This damage detection algorithm is used to evaluate multiple damage levels and locations.
LEGACY EXTRAGALACTIC UV SURVEY (LEGUS) WITH THE<i>HUBBLE SPACE TELESCOPE</i>. I. SURVEY DESCRIPTION
Calzetti, D.,Lee, J. C.,Sabbi, E.,Adamo, A.,Smith, L. J.,Andrews, J. E.,Ubeda, L.,Bright, S. N.,Thilker, D.,Aloisi, A.,Brown, T. M.,Chandar, R.,Christian, C.,Cignoni, M.,Clayton, G. C.,Silva, R. da,Mi IOP Publishing 2015 The Astronomical journal Vol.149 No.2