Download e-book for kindle: NMR Methods for the Investigation of Structure and Transport by Edme H Hardy

By Edme H Hardy

ISBN-10: 3642216277

ISBN-13: 9783642216275

ISBN-10: 3642216285

ISBN-13: 9783642216282

Methods of nuclear magnetic resonance (NMR) are more and more utilized in engineering sciences. The publication summarizes learn within the box of chemical and procedure engineering played on the Karlsruhe Institute of expertise (KIT). basics of the equipment are uncovered for readers with an engineering heritage. functions conceal the fields of mechanical strategy engineering (filtration, solid-liquid separation, powder blending, rheometry), chemical technique engineering (trickle-bed reactor, ceramic sponges), bioprocess engineering (biofilm growth), and nutrition technique engineering (microwave heating, emulsions). Magnetic Resonance Imaging (MRI) in addition to low-field NMR are lined with notes on undefined. Emphasis is put on quantitative info research and photo processing.

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A typical duration of D 1 ms was chosen for the sinc pulse. The amplitude of the rf field is calculated considering the center of the slice where the slice gradient produces no additional field. 52) 0 As starting point 128 points along the slice direction between 5 mm and 5 mm with constant equilibrium magnetization were chosen. The desired slice thickness was set to z D 4 mm. 2 / D 6 kHz. 50). g. maximum x component within the slice. Outside the slice the situation is inverse. The remaining y component is zero at all positions.

Experimentally, the generation of permanent gradients can be avoided by actively shielded gradient systems as described in Sect. 1. 4 Post Processing In the inverse discrete Fourier transform it is assumed that data points are sampled on a grid of equidistant sampling points, see p. 14ff. The N ideal sampling points in reciprocal velocity space are denoted as qv n D nqv inc with n D N=2; : : : ; N=2 1. The irregular grid resulting from a permanent-gradient hysteresis is designated by qv G . qv G /.

The transverse components however oscillate along the slice direction. Application of the slice refocusing gradient after the rf pulse, see Fig. 5c, produces the profiles of x and y magnetization depicted in Fig. 5d. 52 times the integral of the slice gradient. For higher flip angles such as in Fig. 50). Such simulations are used in the optimization of parametrized pulse shapes with respect to given properties such as sharp slice boarders without oscillation of transverse components [25]. If all rf pulses in an experiment are slice selective a pseudo 3D image can be obtained in the experimental time of a 2D image.

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NMR Methods for the Investigation of Structure and Transport by Edme H Hardy

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