Enhanced air pollutant removal efficiency of photocatalytic concrete with waste glass

This study investigates the air pollutant removal efficiency of photocatalytic concrete with incorporated waste glass. Concrete samples are prepared with two different TiO2 photocatalysts applied at different dosages. Subsequently, the photocatalytic oxidation (PCO) degradation efficiency of air pollutant is tested and compared between the reference concrete samples with normal aggregates and samples with waste glass particles. The obtained results indicate that the utilization of glass as concrete aggregate can enhance the PCO efficiency of concrete. The highest PCO efficiency improvement by glass particles application reached over 52% compared to the reference sample

Evolution of a Bose-condensed gas under variations of the confining potential

We discuss the dynamic properties of a trapped Bose-condensed gas under variations of the confining field and find analytical scaling solutions for the evolving coherent state (condensate). We further discuss the characteristic features and the depletion of this coherent state.Comment: 4 pages, no postscript figure

Structural lightweight aggregates concrete

This paper addresses the development of a structural lightweight aggregates concrete (SLWAC), aiming at a good balance between a low specific density and thermal conductivity, and high mechanical properties. The mix design is performed by applying the modified Andreasen and Andersen model to secure a densely packed matrix, composed of a binder and lightweight aggregates. The water absorption of the applied lightweight aggregates, expanded clay, is studied and an effective water dosage is determined from the obtained results. The fresh behaviour test of the designed concrete shows an acceptable workability, under a water-cement dosage of 0.35. The developed SLWAC shows excellent thermal properties, with a low thermal conductivity of about 0.20 W/(m¿K); and moderate mechanical properties, with a 28-day compressive strength of about 34 MPa (class of LC30-33 according to EN 206-1), with an apparent density of about 1250 kg/m3. The significantly low thermal conductivity of the developed concrete under this strength class can find a wide application potential, both for structural and thermal insulating purposes

Determining GaN nanowire polarity and its influence on light emission in the scanning electron microscope

The crystal polarity of noncentrosymmetric wurtzite GaN nanowires is determined nondestructively in the scanning electron microscope using electron backscatter diffraction (EBSD). The impact of the nanowire polarity on light emission is then investigated using cathodoluminescence (CL) spectroscopy. EBSD can determine polarity of noncentrosymmetric crystals by interrogating differences in the intensity distribution of bands of the EBSD pattern associated with semipolar planes. Experimental EBSD patterns from an array of GaN nanowires are compared with theoretical patterns produced using dynamical electron simulations to reveal whether they are Ga- or N-polar or, as in several cases, of mixed polarity. CL spectroscopy demonstrates the effect of the polarity on light emission, with spectra obtained from nanowires of known polarity revealing a small but measurable shift (≈28 meV) in the GaN near band edge emission energy between those with Ga and N polarity. We attributed this energy shift to a difference in impurity incorporation in nanowires of different crystal polarity. This approach can be employed to nondestructively identify polarity in a wide range of noncentrosymmetric nanoscale material systems and provide direct comparison with their luminescence

WS13.1 Patients with mutations that permit 3% or more of wild-type CFTR function are associated with higher FEV1

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