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Now showing items 99699988 of 39124

(2003)Newtonian viscosities of 19 natural multicomponent melts ranging in composition from basanite through phonolite and trachyte, to dacite have been analysed in the range of 1001012 Pa s. These data, together with the results ...

(2002)A natural Carich pigeonite (En47Fs43Wo10), free of augite exsolution products, was studied by in situ hightemperature singlecrystal Xray diffraction. The sample, monoclinic P21/c (a=9.719(7) A, b=8.947(9) A, c=5.251(3) ...

(2003)The paleomagnetic assumption that the Earth's magnetic field is reduced to a geocentric axial dipole (GAD) when sufficiently sampled has been called into question for Mesozoic and earlier times. It has been suggested, for ...

(2003)The partitioning of rareearth elements (REEs: Gd and multiple REEs), Sr, and Mn between fluorapatite and CaF2rich melts was investigated over a wide range of REE concentrations (i.e., from 0.8 ± 0.1 to 25,000 ± 2600 ppm ...

(2001)The lithosphere of the Earth is structured as a hierarchical system of volumes of different sizes, from about 10 tectonic plates to about 1025 grains of rock. Their relative movement against the forces of friction and ...

(2002)The development of temporary and permanent broadband seismic arrays reinforces the need for advanced interpretation techniques in surfacewave analysis. We present a new method based on 2D paraxial ray theory of inverting ...

(2006)Our examination of nine CM chondrites that span the aqueous alteration sequence leads us to conclude that compact dark fine mantles surrounding chondrules and inclusions in CM chondrites are not discrete finegrained rims ...

(2002)Nonpegmatitic occurrences of Be minerals constitute a diverse set of geologic environments of considerable mineralogical and petrological interest; they currently provide the majority of the world’s Be ore and emeralds ...

NONRACEMIC AMINO ACIDS IN THE MURRAY AND MURCHISON METEORITES  OPTICAL ACTIVITY IN ORGANIC MATTER (2000)Small (1.09.2%) lenantiomer excesses were found in six αmethylαamino alkanoic acids from the Murchison (2.89.2%) and Murray (1.06.0%) carbonaceous chondrites by gas chromatographymass spectroscopy of their ...

(1998)Experiments demonstrate that partial evaporation of solid silica at 16001700°C and low pressure (109 bar) results in enrichment of 18O/16O and 17O/16O in solid products. Evaporative residues formed in H2 or N2 gas at ...

(2002)This work deals with reconstruction of nonsmooth solutions of the inverse gravimetric problem. This inverse problem is very illposed, its solution is nonunique and unstable. The stable inversion method requires ...

(2001)For dealing with hydrological nonstationarity in flood frequency modelling (FFM) and hydrological design, it is necessary to account for trends. Taking the case of atsite FFM, statistical parametric techniques are discussed ...

NONSTATIONARY APPROACH TO ATSITE FLOOD FREQUENCY MODELLING II. WEIGHTED LEAST SQUARES ESTIMATION (2001)This is the second of the threepart paper and generalises the least squares method to the weighted least squares (WLS) method in order to deal with the trend in the first two moments. The generalised method applies when ...

NONSTATIONARY APPROACH TO ATSITE FLOOD FREQUENCY MODELLING. III. FLOOD ANALYSIS OF POLISH RIVERS (2001)This paper, the last of a threepart paper, investigates into trends in annual maximum flows of Polish rivers using 39 flow series for a period of 70 years from 1921 to 1990. The gradients of trends in the mean and the ...

(2003)The presence of significant nonstationarity in a hydrologic time series cannot be ignored when estimating design values for future time horizons. This paper introduces a secondorder nonstationary approach to pooled flood ...

(2003)Most treatments of the Phanerozoic evolution of the carbon dioxide content of the atmosphere (PCO2) assume a steady state closed system. Release of CO2 by mantle degassing and by biogenic precipitation of carbonates and ...

(2003)Recent work with stochastic inverse modeling techniques has led to the development of efficient algorithms for the construction of transmissivity (T) fields conditioned to measurements of T and head. Small numbers of ...

(1988)The paper presents a theory to understand the mechanism governing the contribution of sediments to the phosphorus exchange with the water column, and to plan methods of evaluating the danger of the sediments acting as a ...

(2003)Fe isotopes can be fractionated to similar extent by both biological and nonbiological processes in the laboratory. However, fractionation mechanisms are not yet clear, making it difficult to generalize from the laboratory ...

(2001)Mantlederived spinel harzburgites from the Kamchatka arc have fractionated Pd group element patterns, and Pt is clearly enriched relative to Pd and Rh. This fractionation is also consistent with chondritic Irgroup ...
Now showing items 99699988 of 39124