Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"Ultrasonic technique"”.
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Statistical methods applied to acousto-ultrasonic technique
… of composites limits the use of conventional techniques such as radiography , eddy-current or ultrasonics. Recently, a new technique known as the Acousto-Ultrasonic (AU) technique, has been developed and appears to hold promise as a method for the evaluation of composite material quality. …
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Determination of Crispness in Breaded Fried Chicken Nuggets Using Ultrasonic Technique
… fried foods. In this study, the mechanical and ultrasonic techniques were used to determine crispness in breaded fried chicken nuggets under different storage conditions. The mechanical measurements have been made, using an Instron universal testing machine. An ultrasonic non-destructive …
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Prediction of service load of concrete structures after cracking using ultrasonic technique
… to assess their remaining service lives. A novel ultrasonic technique is utilized to detect crack propagation in notched beams of mortar, plain concrete and reinforced concrete. The study showed that crack growth and microcrack zone in cementitious composites can be quantitatively detected by the …
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A feasibility study of the acousto-ultrasonic technique to assure the quality of adhesively bonded sheet metal
… objective is to study the feasibility of Acousto-Ultrasonics (AU) as a nondestructive technique for assuring the quality of adhesively bonded sheet-metal used for automobiles. Other nondestructive (NDT) techniques were also applied viz., ultrasonics. radiography and thermography to supplement and …
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Pulsed-Laser Ultrasound Generation in Fiber-Reinforced Composite Material
A laser-based ultrasonic technique using a pulsed laser for stimulating ultrasonic waves in fiber-reinforced composite materials is the subject of investigation. For convenience, the material is chosen to be homogeneous transversely isotropic. The study is strictly limited to the laser power …
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An acousto-ultrasonic system for the evaluation of composite materials
A presentation is given of an acousto-ultrasonic system for the evaluation of composite materials. First, a brief statement will be made on the acousto-ultrasonic technique and its relative worth compared to other nondestructive testing techniques as applied to composite materials. The following …
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Investigation into the feasibility of an electro-optic rail surface monitor
… the feasibility of a new electro-optic technique which records surface irregularities on a track. It is more sensitive to crack detection than the traditional trailing wheel method and approximately one thousand times less expensive than the highly sensitive ultrasonic technique used by …
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Lamb wave propagation in laminated composite plates
… method, similar in configuration to the acousto-ultrasonic technique, was used to measure Lamb wave phase velocities. Low frequency Lamb waves, usually in the range of 10 kHz to 1 MHz, were generated. Dispersion curves of the lowest symmetric Lamb mode and the lowest antisymmetric Lamb mode were …
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Engineering of Inhalation Aerosols Combining Theophylline and Budesonide
… this study was to develop the spray drying and ultrasonic process for engineering of combination drug particles that will be delivered more efficiently and independently of dose variations to the lung. Microparticles were produced by spray drying or/and ultrasonic technique. The processing …
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Non-invasive quality evaluation of fruits and vegetables using ultrasound
Ultrasonic techniques were investigated for non-invasive quality evaluation of selected fruits and vegetables. An ultrasonic non-destructive evaluation system was developed and used to investigate physical and acoustical property changes for the selected fruits and vegetables non-invasively. The …
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On-line non-destructive ultrasonic rheology measurement of solder pastes
… the quality of the solder paste. Conventional techniques for monitoring the quality of solder pastes during the production and packaging stage are usually based on the viscosity measurements of the solder pastes from the viscometer and rheometer. One of the potential limitations of viscometer- …
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Control of micro- and nanostructure: I. polymer gas chromatography microcolumns and II. applications of ultrasound
… second part of this thesis concerns the use of ultrasonic nebulization of solutions and suspensions both to produce unique nanostructured materials and to aid the study of nanomaterials. The first chapter introduces GC and GC capillary microcolumns. A brief history of the development of GC is …
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Multifunctionality in epoxy/glass fibers composites with graphene interphase
… by an electrophoretic deposition (EPD) technique. Graphite oxide was prepared using modified Hummers method in which raw graphite powder was oxidized using potassium permanganate (KMnO4) in acidic solution. Using ultrasonic technique, the graphite oxide was dispersed homogenously in …