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Article
Thermogravimetric Analysis for Acidity Determination in Pillared Clays
Thermogravimetric analysis of pyridine adsorption was applied to study the acidity at different temperatures of clays pillared with Al pillars and mixed Al-Ga pillars, in relation to the starting montmorilloni...
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Article
Cesare Barbieri, Jürgen H. Rahe, Torrence V. Johnson and Anita M. Sohus (eds.), The Three Galileos: The Man, The Spacecraft, The Telescope, Astrophysics and Space Science Library, Vol. 220
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Article
Arginine-Vasopressin (AVP) Plays a Role in the Maintenance of the Vascular Tone in Normoxia in the Llama Fetus (Lama glama)
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Article
Kinked cracks in anisotropic elastic materials
The problem of a kinked crack is analysed for the most general case of elastic anisotropy. The kinked crack is modelled by means of continuous distributions of dislocations which are assumed to be singular bot...
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Article
Analysis of sharp angular notches in anisotropic materials
The singular stresses at the tip of a sharp angular notch are analysed for the most general case of elastic anisotropy. The problem is stated in relation with the kinked crack and is modelled by means of conti...
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Chapter
Kinked cracks in anisotropic elastic materials
The problem of a kinked crack is analysed for the most general case of elastic anisotropy. The kinked crack is modelled by means of continuous distributions of dislocations which are assumed to be singular bot...
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Chapter
Observations of Mutual Events between Jupiter Satellites
As a contribution to the “PHEMU97” International Campaign, photoelectric observations of the mutual events between the Jupiter satellites are planned at the Astronomy Institute of Catania University. The pheno...
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Chapter
Analysis of sharp angular notches in anisotropic materials
The singular stresses at the tip of a sharp angular notch are analysed for the most general case of elastic anisotropy. The problem is stated in relation with the kinked crack and is modelled by means of conti...
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Article
Physical studies of asteroids XXX: the asteroid 153 Hilda
The asteroid 153 Hilda was studied by photometric, spectroscopic and polarimetric observations during the apparition in 1992. The rotation period was determined to 5.11 hours with a lightcurve amplitude of 0.0...
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Article
Coating cracks in materials with general anisotropy
The problem of a straight crack lying in the coating of a semi-infinite substrate is considered. The most general case of anisotropy is assumed for both materials (coating and substrate). The solution of Atkin...
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Article
Influence of the clay and the nickel content in catalysts for vegetable oil hydrogenation
Nickel catalysts prepared using two different clays as support, natural bentonite and palygorskite, and with different nickel contents have been tested in the hydrogenation of a sunflower oil. The influence of...
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Article
Anti-immunoglobulin antibodies in children with Schönlein-Henoch syndrome. Absence of serum anti-IgA antibodies
Circulating immune complexes (CIC) that simultaneously contain IgG and IgA are frequently found in IgA nephropathy (IgA-N) and the Schönlein-Henoch syndrome (SHS). The presence of anti-immunoglobulin antibodie...
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Article
Probing Titan's atmosphere by stellar occultation
WE report results from the first stellar occultation by Titan ever observed. As predicted by Wasserman1, on 3 July 1989 the bright star 28 Sagittarii (visual magnitude, V ≈ 5.5), passed behind Saturn's giant moon...
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Article
Infrared Studies of Surface Acidity and Reversible Folding in Palygorskite
The infrared absorption spectra of a palygorskite sample from Cáceres, Spain, showed two previously unreported bands in the OH-stretching region at 3420–3440 and 3220–3230 cm−1 after evacuation at 90°–230°C. Thes...
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Chapter
Identification and Protection of Existing and Potential Observatory Sites
At the XIXth General Assembly our Commission held two meetings during the course of which the following papers were presented:
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Article
The regulatory region of the uxuAB operon in Escherichia coli K12
The uxuAB operon is composed of two genes coding for enzymes involved in hexuronate degradation. This operon is negatively controlled by the uxuR and exuR regulatory gene products. Starting from uxu hybrid plasmi...
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Article
Interchangeability of repressors for the control of the uxu and uid operons in E. coli K12
The uidA and uxuAB operons are each under the dual control of two repressor molecules: the uidR and uxuR encoded repressors negatively control the uidA operon whereas the uxuAB operon is regulated by the uxuR and...
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Chapter and Conference Paper
IUE Spectra of RS CVn Stars
The characteristic optical light curves of RS CVn — and BY Dra-type variables are believed to represent non-uniform distribution of dark spots akin to sunspots which are revealed by rotation. By analogy with t...
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Chapter and Conference Paper
Twenty Years of Dedicated Photometry of Rs CVn at Catania Observatory
We present a complete set of yearly seasonal light curves (LC) of RS CVn obtained from 1963 to 1982 at Catania Observatory, integrated with two LCs obtained by Ludington (1978) in 1975 and 1976. This unique ob...
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Chapter and Conference Paper
Features of the Wave-Like Distortion in Some RS CVn Binaries
One of the outstanding features of RS CVn-type binaries is the changing shape of the so called “wave-like distortion” or “photometric wave” (PW) and its phase migration on the light curve (LC). Here we present...
