The Fantastic Four: A plug 'n' play set of optimal control pulses for enhancing nmr spectroscopy

We present highly robust, optimal control-based shaped pulses designed to replace all 90{\deg} and 180{\deg} hard pulses in a given pulse sequence for improved performance. Special attention was devoted to ensuring that the pulses can be simply substituted in a one-to-one fashion for the original hard pulses without any additional modification of the existing sequence. The set of four pulses for each nucleus therefore consists of 90{\deg} and 180{\deg} point-to-point (PP) and universal rotation (UR) pulses of identical duration. These 1 ms pulses provide uniform performance over resonance offsets of 20 kHz (1H) and 35 kHz (13C) and tolerate reasonably large radio frequency (RF) inhomogeneity/miscalibration of (+/-)15% (1H) and (+/-)10% (13C), making them especially suitable for NMR of small-to-medium-sized molecules (for which relaxation effects during the pulse are negligible) at an accessible and widely utilized spectrometer field strength of 600 MHz. The experimental performance of conventional hard-pulse sequences is shown to be greatly improved by incorporating the new pulses, each set referred to as the Fantastic Four (Fanta4).Comment: 28 pages, 19 figure

Environmental Archaeology for a Thracian Tomb in Tash Bair, Bulgaria

In this magister thesis project, soil samples from the late 5th to early 4th century BCE, Thracian tomb in Tash Bair, Bulgaria, have been analysed with geoarchaeological and archaeobotanical methods to supplement and corroborate the existing theories about the site. The tomb had a wooden roof which was suspected to have collapsed already in antiquity. The cremation was believed to have been done elsewhere, and only the remains were brought into the tomb in an organic vessel. Magnetic susceptibility (MS), phosphate analysis (CitP), loss on ignition (LOI) and XRF analyses were used to study the environmental record contained in the soil. Archaeobotanical material was extracted using floatation as well as sorting, and the samples were documented using microscope photography. Amongst others, fragments of bones, charcoal, wood were found, but also seeds, roots, earthworm faeces and a lot of tiny shells and shell fragments. Certain spikes in MS and phosphate concentration were observed, indicating the presence of metals and possible organic grave goods. The traces of several heavy metals in the samples ask for further research. The organic container of the cremated remains is suggested to have been created using Typha s

The dynamics of hydrophobic interaction. A microwave dielectric study

To investigate the relation between the structure of liquid water and hydrophobic interaction the dielectric relaxation of water in dilute aqueous solutions has been studied. After an introduction of the problem in which the dynamic aspects of water structure are emphasized, a theoretical analysis of the dielectric relaxation of water and aqueous solutions is given ... Zie: Summary

A 13C Double-Filtered NOESY with Strongly Reduced Artefacts and Improved Sensitivity

Contains fulltext : 29362___.PDF (publisher's version ) (Open Access