On the Generalized Prandtl Relation

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/77572/1/AIAA-7582-549.pd

On the Flow of a Hydromagnetic Fluid Near an Oscillating Flat Plate

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/77544/1/AIAA-8057-393.pd

Adaptive use of thresholding and multiple colour space representation to improve classification of MMCC barcode

Colour 2D barcodes, such as the MMCC barcode, have been developed recently to improve the data capacity of monochrome barcodes. However, the use of colour imposes greater challenges in decoding the symbols correctly as different lighting conditions on the barcode vary the values of the colours significantly. Hence, it is desirable to have an adaptive classification of the data cells so as to adapt to various lighting conditions. In this paper, we propose a classification method that is able to adapt to different lighting conditions during the classification of the MMCC data cells in a mobile environment. To highlight the effectiveness of this method, it is compared against the classification of the data cells performed in two different colour space representations, namely RGB and YCbCr

The Use of Border in Colour 2D Barcode

In recent years, a trend has emerged in the use of colour to increase the data capacity of the 2D barcode. However the decoding of such colour barcode can be challenging in a mobile environment due to blurring effect that is commonly found in images captured by camera mobile phone. Blurring affects the synchronisation between the cells. It also causes the colour value of the cell to be wrongly interpreted. Hence, this paper proposes the use of border to improve the synchronisation and decoding. Three different types of border and the choice of its width will be investigated

The use of alignment cells in MMCC barcode

The QR code, a monochrome 2D barcode, is a popular and commonly used barcode system worldwide. QR codes can easily be read using a mobile phone with the appropriate decoder. As there is an increasing need for higher data capacity barcodes, some newer 2D barcodes, such as the MMCC code, have adopted the use of colour. However, the use of colour introduces more challenges for mobile phone decoders than with monochrome codes. In this paper, the use of alignment cells within the MMCC code is proposed to improve the robustness of the colour barcode when used in a mobile environment. With the addition of the alignment cells, the MMCC code is shown to achieve high data capacity even with a smaller physical size and the limitations of mobile phone cameras

On the kelvin-Helmholtz instability of the Earth's magnetopause

The effect of the finite thickness of the shear layer on the Kelvin-Helmholtz instability of the Earth's magnetopause boundary is investigated. The thickness of the layer stabilizes the boundary with respect to short wavelength perturbations, which were previously found to be unstable in the zero thickness analysis. Compressibility effects further stabilize the layer. The effects of the magnetic field on the instability are also discussed.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/34179/1/0000468.pd

The long time behavior of a finite amplitude shear Alfven wave in a warm plasma

The long time behavior of a monochromatic, finite amplitude shear Alfven wave is studied by means of the Krylov-Bogoliubov-Mitropolsky perturbation technique. The plasma model is assumed to be described by the linearly non-dispersive, ideal magnetohydrodynamic equations. Non-linear coupling between the Alfven pump wave and a free sound wave gives rise to forced magnetic sidebands. It is shown that the Alfven pump wave as well as the magnetic sidebands steepen up in the long time scale.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/48948/2/ppv18i10p809.pd

Multiparameter Moment Matching Model Reduction Approach for Generating Geometrically Parameterized Interconnect Performance Models

In this paper we describe an approach for generating geometrically-parameterized integrated-circuit interconnect models that are efficient enough for use in interconnect synthesis. The model generation approach presented is automatic, and is based on a multi-parameter model-reduction algorithm. The effectiveness of the technique is tested using a multi-line bus example, where both wire spacing and wire width are considered as geometric parameters. Experimental results demonstrate that the generated models accurately predict both delay and cross-talk effects over a wide range of spacing and width variation.Singapore-MIT Alliance (SMA

On the propagation of ionization waves

A non-linear analysis of ionization wave fronts is given including energy effects. The necessary external energy source is Joule heating due to an applied transverse electric field. The front propagates at a speed which is proportional to the product of the electron sound speed and the square root of the ratio of the electron collision time to the reaction time. The structure of the ionization wave is also obtained.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/48943/2/ppv11i9p739.pd

Scattering of electromagnetic waves by electron acoustic waves

It is shown that a large amplitude electromagnetic wave can parametrically excite low-frequency electrostatic modified electron acoustic waves which are unique to three-component plasmas ions, hot electrons and a group of cold electrons. The growth rates and thresholds of the decay instabilities are obtained. Application of our results in the auroral region of the ionosphere is illustrated.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/26789/1/0000345.pd