Dr. Wilfred Ngwa Profile

Dr. Wilfred Ngwa

Assistant Professor at Univ of Massachusetts Lowell

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Author

Publications (6)

Proceedings Article | 9 April 2010 Paper

Determination of sound velocity and acoustic impedance of thin chitosan films by phase-sensitive acoustic microscopy

Albert Kamanyi, Esam Ahmed Mohamed, Wilfred Ngwa, Wolfgang Grill

Proceedings Volume 7650, 76502A (2010) https://doi.org/10.1117/12.847745

KEYWORDS: Acoustics, Reflectivity, Glasses, Thin films, Microscopy, Reflection, Microscopes, Water, Interfaces, Material characterization

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Proceedings Article | 21 April 2008 Paper

Effects of solvent vapor pressure and spin-coating speed on morphology of thin polymer blend films

Albert Kamanyi, Wilfred Ngwa, Weili Luo, Wolfgang Grill

Proceedings Volume 6935, 69351X (2008) https://doi.org/10.1117/12.776274

KEYWORDS: Atomic force microscopy, Polymer thin films, Polymers, Thin films, Polymethylmethacrylate, Coating, Acoustics, Microscopy, Picosecond phenomena, Silicon

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Proceedings Article | 19 April 2007 Paper

Soft matter acoustics: non-destructive health monitoring of polymer blend films

Albert Kamanyi, Wilfred Ngwa, Tribikram Kundu, Wolfgang Grill

Proceedings Volume 6531, 653106 (2007) https://doi.org/10.1117/12.715870

KEYWORDS: Polymers, Acoustics, Glasses, Atomic force microscopy, Polymer thin films, Polymethylmethacrylate, Content addressable memory, Nondestructive evaluation, Silicon, Microscopy

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Proceedings Article | 9 May 2005 Paper

Acoustic phase micrographs in mesoscale materials characterization

W. Ngwa, W. Luo, T. Kundu, W. Grill

Proceedings Volume 5768, (2005) https://doi.org/10.1117/12.598053

KEYWORDS: Acoustics, Photomicroscopy, Phase contrast, Material characterization, Nondestructive evaluation, Microscopes, Image processing, Imaging systems, Signal attenuation, Image resolution

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Proceedings Article | 21 July 2004 Paper

Precision measurement of acoustic reflectivity for a scanning acoustic microscope that measures amplitude and phase: applicability in biology

Wilfred Ngwa, Stefan Knauth, Christian Laforsch, Wolfgang Grill

Proceedings Volume 5394, (2004) https://doi.org/10.1117/12.544126

KEYWORDS: Acoustics, Reflectivity, Microscopes, Phase measurement, Microscopy, Biology, Image processing, 3D image processing, Reflection, Precision measurement

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Proceedings Article | 21 July 2004 Paper

Bio-soft-matter imaging and micrometrology by phase-sensitive ultrasonic microscopy

Wilfred Ngwa, Wolfgang Grill, Tribikram Kundu

Proceedings Volume 5394, (2004) https://doi.org/10.1117/12.538794

KEYWORDS: Acoustics, Microscopy, Particles, Reflection, Glasses, Biopolymers, Ultrasonics, Systems modeling, Nondestructive evaluation, Solids

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Showing 5 of 6 publications

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