Suchergebnisse

Front Cover -- Annual Reports on NMR Spectroscopy -- Annual Reports on NMR Spectroscopy -- Copyright -- Contents -- CONTRIBUTORS -- PREFACE -- One - Solid-State NMR Studies of Molecular Crystals -- 1. INTRODUCTION -- 1.1 The Role of Molecular Crystals of Small Compounds in Development of Solid-State NMR Techniques -- 1.2 Very Fast MAS Solid-State NMR -- 1.3 2D and 3D Proton Solid-State NMR Techniques Under Very Fast Sample Spinning -- 1.4 Two-Dimensional Inverse Detected 1H-X Heteronuclear Techniques -- 1.5 Dynamic Nuclear Polarization Solid-State NMR -- 2. INORGANIC AND HYBRID INORGANIC-ORGANIC MOLECULAR CRYSTALS -- 3. MOLECULAR CRYSTALS OF SMALL ORGANIC COMPOUNDS, INCLUDING APIS -- 4. PHARMACEUTICAL COCRYSTALS -- 5. PHASE TRANSITIONS, MOLECULAR DISORDER, MOLECULAR DYNAMICS -- 5.1 De- and Rehydration Studies -- 5.2 Phase Transitions -- 5.3 Molecular Dynamics -- 5.4 Other Solid-State Processes Followed by Solid-State NMR -- 6. THEORETICAL METHODS SUPPORTING NMR ANALYSIS OF MOLECULAR CRYSTALS -- 6.1 Theoretical Approaches and Benchmarks -- 6.2 Application Examples -- 7. CONCLUSIONS -- ACKNOWLEDGEMENTS -- REFERENCES -- Two - Recent MRI Studies on Heterogeneous Catalysis -- 1. INTRODUCTION AND GENERAL INFORMATION -- 2. CONVENTIONAL MRI STUDIES OF CATALYTIC PROCESSES -- 2.1 Mapping of the Liquid Phase Distribution and Dynamics -- 2.2 Mapping Reactants and Products With Spectroscopic Resolution -- 2.3 Spatially Resolved Thermometry -- 3. MRI/MRS STUDIES WITH HYPERPOLARIZATION-BASED SIGNAL ENHANCEMENT -- 4. MRI STUDIES OF OPERATING MICROREACTORS -- 5. SUMMARY -- ACKNOWLEDGEMENTS -- REFERENCES -- Three - NMR Studies of Protic Ionic Liquids -- 1. INTRODUCTION -- 2. IONIC LIQUIDS -- 2.1 Protic Ionic Liquids -- 3. PROTON CHEMICAL SHIFTS AND PROTON TRANSFER -- 4. RELAXATION TIME EXPERIMENTS -- 4.1 Rotational Correlation times for Inert Solute Molecules

This contribution presents a simple and fast Synthetic Aperture Radar (SAR)-based technique for microwave imaging and material characterization from microwave measurements acquired in tomographic systems. SAR backpropagation is one of the simplest and fastest techniques for microwave imaging. However, in the case of heterogeneous objects and media, a priori information about the constitutive parameters (conductivity, permittivity) is needed for an accurate imaging. In some cases, a first guess of the constitutive parameters can be extracted from an uncorrected SAR image, and then the estimated parameters can be introduced in a second step to correct the SAR image. The main advantage of this methodology is that there is little or no need for a priori information about the object to be imaged. Besides, calculation time is not significantly increased with respect to conventional SAR, thus allowing real-time imaging capabilities. The methodology has been validated by means of measurements acquired in a cylindrical setup. ; This research was partially supported by the "Ministerio de Economía y Competitividad" of Spain/FEDER under grant FPU15/06341; by the Principado de Asturias under project GRUPINN-18-000191; and by the European Union under the framework of the Erasmus+ mobility agreement between the University of Oviedo (E OVIEDO 01) and Hochschule Mannheim (D MANNHEI 03).

Diagnosis of stable coronary artery disease is vital for prognosis, classification and early treatment. Current guidelines show that patients with stable angina who are suspected of CAD need to undergo a certain protocol for classification and further analysis. This review's aim is to present the most used non-invasive techniques for identification of CAD and to underline the current development of imaging technology and the possible reduction of invasive measures due to non-invasive techniques. Currently, non-invasive techniques used to diagnose stable coronary artery disease have a very high accuracy and newer methods seem to be comparable to the gold-standard. The majority of the methods discussed have an optimal performance for patients with PTP between 15-85%, and the future of diagnosis for these patients seem to involve less invasive measures and less radiation by improving the current devices and by usage of machine-learning algorithms.

International audience ; Despite predictions of the paperless office, global demand for printing and writing paper remains strong, and paper appears to be here to stay for some time. Not only firms, but also governments, libraries, and archives are in possession of large collections of legacy documents that still must be sorted and scanned. In this study, terahertz-based techniques are demonstrated to address several routine tasks related to the automated paper handling of unsorted legacy documents. Specifically, we demonstrate terahertz-based counting of the number of sheets in unconsolidated paper stacks, as well as locating stapled documents buried in paper stacks.

International audience ; Despite predictions of the paperless office, global demand for printing and writing paper remains strong, and paper appears to be here to stay for some time. Not only firms, but also governments, libraries, and archives are in possession of large collections of legacy documents that still must be sorted and scanned. In this study, terahertz-based techniques are demonstrated to address several routine tasks related to the automated paper handling of unsorted legacy documents. Specifically, we demonstrate terahertz-based counting of the number of sheets in unconsolidated paper stacks, as well as locating stapled documents buried in paper stacks.

This handbook and ready reference covers materials science applications as well as microfluidic, biomedical and dental applications and the monitoring of physicochemical processes. It includes the latest in hardware, methodology and applications of spatially resolved magnetic resonance, such as portable imaging and single-sided spectroscopy. For materials scientists, spectroscopists, chemists, physicists, and medicinal chemists.

Thin films of a chiral diketopyrrolopyrrole derivative were imaged with spatially-defined Mueller Matrix Polarimetry, focussing on the Circular Dichroism signal, giving unique insight into the impact that deposition techniques and thermal annealing can have on chiral supramolecular structures in the solid state, where homogeneity was observed for spun-coated films while drop-coating afforded chiroptical diversity in the material, a feature invisible to absorption spectroscopy or optical microscopy. ; We thank the University of Nottingham through the Propulsion Futures Beacon of Excellence and the EPSRC through the LDMI DTP. The Diamond Light Source Ltd (beamline B23) is thanked for providing beamtime (SM22017 and SM26044) and Drs T.-M. Gianga, T. Ja´vorfi and R. Hussain for beamline assistance. ; With funding from the Spanish government through the 'Severo Ochoa Centre of Excellence' accreditation (CEX2019-000917-S). ; Peer reviewed