This paper presents a wavelet based method of analysis of experimentally recorded weak electric signals from marble specimens which have undergone successive abrupt step loadings. Experimental results verify the existence of “memory effects” in rocks, as far as the current emission is concerned, akin to the “Kaiser effect” in acoustic emissions, which accompany rock fracturing. Macroscopic sign...

UNLABELLED The Atraumatic Restorative Treatment (ART) approach was suggested to be a suitable method to treat enamel and dentine carious lesions in patients with disabilities. The use of a restorative glass-ionomer with optimal mechanical properties is, therefore, very important. OBJECTIVE To test the null-hypotheses that no difference in diametral tensile, compressive and flexural strengths ...

Ancient DNA is becoming increasingly recognised as a tool in conservation biology to audit past biodiversity. The widespread loss of Australian biodiversity, especially endemic mammal populations, is of critical concern. An extreme example occurred onDepuch Island, situated off the north-west coast ofWestern Australia, where an unidentified species of rock-wallaby (Petrogale sp.) became extinct...

The paper presents some results of the characterization of microstuctural differences inside and outside compaction bands in natural sandstone. Specimens of Aztec sandstone were scanned at the synchrotron APS, at Argonne National Laboratory (USA). Porosity measurements obtained by image analysis show a sharp transition inside/outside the compaction band. Finally, preliminary permeability measur...

Abstract To accurately predict coal burst hazards and estimate the failure of pillars in underground mining systems, it is great significance to understand mechanical behavior coal-rock bimaterial composite structures. This paper presents experimental numerical investigations on response rock-coal, coal-rock, rock-coal-rock structures under triaxial compression. The compression experiments are ...

In recent years~ severaL species of crab have come under increasing study by scientists. Fluctuations in populations of important commercial species (the blue crab) and the commercial potential of others (the rock crab and deep sea red crab) have led t o this increased attention. But in lab situations, researchers have had problems keeping their specimens alive and healthy for long periods. It ...

Purpose The deregulation of the Def6-ROCK2-IRF4 axis in murine models results in both lupus-like and rheumatoid arthritis-like disease characterized by increased IL-17 and IL-21 production that is ameliorated by ROCK inhibition. A known beneficial pleiotropic effect of statins is inhibition of ROCK activation via their effect on RhoA activation. Statins have also been reported to decrease IL-17...

OBJECTIVE The main objectives of the present study were to investigate the rock pigeon parasitic communities from Iraq as well as reporting on the prevalence and intensity of various infections from both sexes. METHODS An examination of 128 specimens of the live rock pigeon Columba livia from Iraq was undertaken. The samples were obtained from several localities of Iraq. Blood samples were ex...

In 3-D analyses of rock slopes there’re can be numerous sliding paths a long a coplanar nonpersistent discontinuity with a known strike. This paper describes an approach for the determination of a most probable sliding path. For this particular study, several blocks of gypsum with the dimensions of 15×15×15 cm containing coplanar non-persistent open joints were fabricated. The models have vario...

In this paper a one-dimensional analytical model for the mechanism of rock fracturing in hydrothermal regimes is described. The model is based upon the modern thermo-poro-elasticity theory and its two non-linear heat-like equations. On the boundary aquifer-caprock a buried thermomechanical source is supposed to be built up in terms of subsurface fluid-rock coupling dynamics. With this considera...