Medieval glazed ceramic from Caesar's Forum (Rome,Italy): Production technology

This study is focused on Medieval Roman heavy lead-glazed ceramics from the archaeological site of the Caesar's Forum (Rome, Italy), dated from the 10th and not beyond the first decades of the 11th century. Optical microscopy (OM), X-ray powder diffraction (XRPD), scanning electron microscopy (SEM-EDS) and electron microprobe analysis (EMPA) have been used for the archaeometric characterization of the ceramics. Petrographic analysis of the body indicated the occurrence of three petro-fabrics, mainly composed by abundant quartz, feldspars, nodules of iron oxides, rare fragments of siliceous rocks, very rare fragments of calcareous rocks, pyroxene, biotite and olivine. This mineralogical assemblage suggests that the ceramics were fired in the range 950–1050 °C, under oxidizing conditions. SEM and EMP analysis show that the ceramic body was produced with non-or moderately calcareous clays and the heavy glaze with lead oxide, silica, alumina and alkalis. The microstructure of the glaze and the relationship with the body suggest that for the production of the ceramic repertoire of the Caesar's Forum either the single or the double firing techniques were used.     

Recovery of 3-D structure from motion is neither euclidean nor affine.

The relationship between simulated and judged depth separations for pairs of probe dots on planar surface patches was examined in a series of 6 experiments. The simulated slant of the patches was varied without varying the simulated depth separation of the probe dots by varying the depth gradient orthogonal to the direction determined by the probe dots on the image plane. Judged depth separation varied with mean slant for constant simulated depth separations. When observers judged depth separations along a closed path, the integral of the signed depths did not sum to zero, as would be required in Euclidean geometry. These results are inconsistent with the view that the mapping between simulated and perceived 3-D structure is affine and indicate that, in general, the perceived structure cannot be represented in either a Euclidean space or an affine space. Moreover, these results are consistent with a first-order temporal analysis of the optic flow. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Solid phase extraction oftrans-resveratrol from wines for HPLC analysis

Some recent studies have put forward the hypothesis that the presence oftrans-resveratrol (trans-3,5,4-trihydroxystilbene) in red wine may be related to some of its therapeutic properties. A fundamental step in view of this evaluation is the development of a method for the quick, accurate and precise analysis of this compound. Sample enrichment and purification can be obtained by solid-phase extraction using reverse-phase C₁₈ cartridges. HPLC analysis carried out by means of a photodiode-array detector, with an internal standard method, allows the detection of up to 10 g/L in wine, with a linear range between 0.6 and 300 ng injected and a precision of 3.3%. The results of the first analyses show that the concentrations oftrans-resveratrol in wines might be much higher than so far reported in the literature.

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HPLC-Analyse vontrans-Resveratrol in Wein nach Fest-Phasen-Anreicherung

Zusammenfassung Nach neueren Ergebnissen kann das Vorkommen vontrans-Resveratrol (trans-3,5,4-Trihydroxystilben) in Rotweinen eine therapeutische Bedeutung haben. Eine wichtige Voraussetzung ist deshalb eine möglichst schnelle und zuverlässige Bestimmungsmethode. Für die Anreicherung und Vortrennung dieser Komponente aus Wein wurde eine Fest-Phasen-Extraktion mit C₁₈-Umkehr-Kartuschen ausgearbeitet. Die anschließende HPLC-Analyse unter Anwendung der internen Standard-Auswertemethode und einem Dioden-Array-Detektor ermöglicht eine Bestimmung von 10 g/Ltrans-Resveratrol in Wein mit einer linearen Eichkurve von 0,6 bis 300 ng und einer Genauigkeit von 3,3%. Die Ergebnisse zeigen, daß die Resveratrol-Gehalte in Wein wesentlich (etwa zehnfach) höher sind als die bisher in der Literatur angegebenen Werte.

     

Model recovery anti-windup for continuous-time rate and magnitude saturated linear plants

In this paper two approaches are given for anti-windup design for nonlinear control systems with linear plants subject to limitations both in the magnitude and the rate of variation of the control input. Both approaches are based on the so-called Model Recovery Anti-Windup (MRAW) framework. The first approach is built by treating the rate + magnitude saturation as a single dynamic nonlinearity, while in the second one, the dynamic compensator dynamics is extended with extra states to treat the two saturations separately. Both approaches lead to global stability with exponentially stable plants and local stability in all other cases. For both approaches, stability and performance guarantees are proven, numerical recipes are given and the relative merits are comparatively highlighted on a simulation example.     

A numerical assessment of the load bearing capacity of externally pressurized moderately thick tubes

The collapse behavior of cylindrical shells pressurized from outside is examined. Attention is focused on tubes of moderate thickness, as required by very deep water pipelines or some innovative nuclear power plant proposals. Their collapse is expected to be dominated by yielding but, because of the decreasing nature of the post-collapse evolution, interaction with instability is likely to be significant enough to demand consideration. At present, no quantitative assessment of such effect is available, because little study has been devoted to tubes in this thickness range.Plasticity–instability interaction is activated by imperfections and to assess their influence on a systematic numerical study is undertaken. Computations produce a meaningful measure of the collapse pressure and it is proposed that the allowable pressure be determined on its basis, by introducing a suitable safety factor. This is chosen so that results reproduce those provided by presently accepted procedures in the well explored and reliable range of medium-thin tubes. When the same factor is applied to thicker tubes, the resulting allowable pressure is significantly higher than the values suggested by codes, which apparently react to the present lack of knowledge by assuming an extremely conservative attitude.     

Synthesis,SAR, and Biological Evaluation of α‐Sulfonylphosphonic Acids as Selective Matrix Metalloproteinase Inhibitors

Selective MMP inhibitors : Eleven α‐sulfonylphosphonates were synthesized and tested as MMP inhibitors. The IC₅₀ values for most of them are in the nanomolar range against MMP‐2, ‐8, ‐13, and ‐14, with an interesting selectivity profile versus MMP‐9.