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Impact of Vector-Current Interactions on the QCD Phase Diagram

Journal of Modern Physics 2013年第5期4卷 644-650页

作者： Thomas Hell Kouji Kashiwa wolfram weise Physik Department Technische Universitat MünchenGarchingGermany ECT* Strada delle Tabarelle 286VillazzanoTrentoItaly RIKEN/BNL Research Center Brookhaven National LaboratoryUptonUSA

Using a nonlocal version of the Polyakov-loop-extended Nambu-Jona-Lasinio model, we investigate effects of a nonderivative vector-current interaction (relating to the quark-number density) at both real and imaginary chemical potentials. This repulsive vector interaction between quarks has the following impact on the chiral first-order phase transition: at imaginary chemical potential it sharpens the transition at the Roberge-Weiss (RW) end point and moves this critical point toward lower temperatures;at real chemical potential, the critical end point moves on a trajectory towards larger chemical potentials and lower temperatures with increasing vector coupling strength. The conditions are discussed at which the first-order phase transition disappears and turns into a smooth crossover.

关键词： QCD Phase Diagram PNJL Model

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The NMR core analyzing tomograph:a multi-functional tool for non-destructive testing of building materials

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Magnetic Resonance Letters 2023年第3期3卷 207-219,I0003页

作者： Sabine Kruschwitz Sarah Munsch Melissa Telong wolfram Schmidt Thilo Bintz Matthias Fladt Ludwig Stelzner Bundesanstalt für Materialforschung und-prüfung Unter den Eichen 87Berlin12205Germany Technische Universitat Berlin Gustav-Meyer-Allee 25Berlin13355Germany

NMR is becoming increasingly popular for the investigation of building materials as it is a non-invasive technology that does not require any sample preparation nor causes damage to the *** on the specific application it can offer insights into properties like porosity and spatial saturation degree as well as pore *** it enables the determination of moisture transport properties and the(re-)distribution of internal moisture into different reservoirs or chemical phases upon damage and ***,as yet most investigations were carried out using devices originally either designed for geophysical applications or the analysis of rather homogeneous small scale(<10 mL)*** paper describes the capabilities of an NMR tomograph,which has been specifically optimized for the investigation of larger,heterogeneous building material samples(diameters of up to 72 mm,length of up to 700 mm)with a high flexibility due to interchangeable coils allowing for a high SNR and short echo times(50-80 ms).

关键词： Natural stone Concrete Sensitivity Moisture transport Cement hydration Supplementary cementitious materials Frost and salt attack Fire spalling

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