Artigo KARNI e KARNI (1985)

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PROPERTIES:COMPOSITION, STRUCTURE, DENSITY 263A 
as well as comparison with gravimetric and gamma densito- 
metry data. Results of the comparison show very close 
agreement between the four techniques. (from Authors) 
9sfi093 
Dispersion parameters from tbe impulse response using 
regression 
W. E. Kelly, 0. Maxac & S. Mares, Journal of Hydrology, 
163(1-2), 1994, pp 85-94. 
A regression method for determining dispersion parameters 
from laboratory and field tracer test results is presented with 
examples. Solutions are presented for one- and two-dimen- 
sional dispersion for three cases: data measured at a single 
location as a function of time; concentrations measured at 
more than one location at the same time; and concentrations 
measured as function of time at more than one location. The 
procedure is illustrated using an idealized example, and actual 
test data from the literature for one-dimensional laboratory 
and two-dimensional field test results. (from Authors) 
956094 
Convolution a debit variable a partir de reponses de 
tracages artlficiels daas les milieux poreux ou karstiqoes; 
the-orle et modele 
(Convolution in time-dependent system from artificial 
tracer tests responses in porous or karst systems; theory 
and modeling) 
M. Dxikowski, Journaf of Hydrology, 164( l-4), 1995, pp 287- 
303. 
An instantaneous point injection of an artificial tracer makes 
it possible to identify the studied system directly. Whether or 
not convolutions can be carried out depends on the linearity 
and stationarity of the tracer-test system. Convolutions from 
the relations between the impulse responses and the hydro- 
dynamic conditions in timedependent systems are only 
allowed under special conditions. The framework in which 
such convolutions are possible is established and a convolu- 
tion integral proposed which makes it possible to obtain the 
result of any input in time of one of the outlets of a vectorial 
system when an artificial tracer teat has been carried out 
between the injection point and this outlet. A few theoretical 
examples of convolution results with variable flow rates are 
presented, these results were obtained with a computer code 
baaed on the proposed convolution integral. (English sum- 
mary) 
956095 
Method for interpreting tracer experiments in radial flow 
using modlfied analytical solutions 
H. Q. Wang & N. Crampon, Journal of Hydrology, 165( l-4), 
1995, pp 11-31. 
The universal type curves for mass transport in radial flow 
established numerically by Sauty in 1978 have been modified 
by using different boundary conditions of high accuracy. The 
method to determine the hydrodispersive parameters by 
interpretation of tracer experiments in radial flow using 
modified approximate analytical solutions is simple and 
accurate. (from Authors) 
PROPERTIES OF ROCKS AND 
SOILS 
General 
956096 
Gypsum in construction: origin and properties 
J. Karni Jr E. Y. Kami, Materials & Structures, 28(176), 
1995, pp 92-100. 
Calcium sulfate, known as natural gypsum, is found in nature 
in different forms, mainly as the dihydrate (CaSOb.2HsO) and 
anhydrite (CaSO,). They are products of partial or total 
evaporation of inland seas and lakes and occur in a variety of 
forms. The origin of gypsum, its genesis, varieties and 
properties are discussed. Details are then given of the 
properties of gypsum paste (setting, expansion, and adhesion) 
and of hardened gypsum (strength, bulk weight, thermal 
expansion, volume and linear changes under humidity 
fluctuations, moisture adsorption, paintability, corrosivity, 
thermal and acoustic insulation behaviour, and fire resis- 
tance). (Authors) 
Composition, structure, texture and 
density 
9s6097 
Mina de Alegria (porcao ocidental). Parte I - Tipologia doa 
comtituintes da jazlda de fern, 
(Algeria Mine (western portion) Part I - tipology of the 
component materials of the iron ore deposit) 
Y. Hasui, A. Zanardo, P. C. Hackspacher, C. U. V. 
Verissimo, V. M. N. Feitosa & L. H. Coelho, Geociencius 
(Sue Puulo), 13(l), 1994, pp 101-119. 
The iron ores of the Alegria Mine (western portion) are 
classified after their petrography/mineralogy/hardness into 1) 
amphibolitic itabirites, 2) pulverulent, friable, and hard 
goethitic itabirites, 3) pulverulent and friable specularitic 
itabirites, 4) friable magnetitic itabrites, and 5) pulverulent to 
hard hematites. Canga, other rock types, veins and breccia- 
like materials are also present. All these materials are 
described. (from English summary) 
956098 
Quantifying soil mic rostrpctore using fractals 
C. A. Moore & C. F. Donaldson, Geotechique, 45(l), 1995, 
pp 105-l 16. 
This paper develops the theoretical basis and presents the 
results of experimental studies to determine a fractal dimen- 
sion associated with soil microstructure. Topics include the 
development of techniques for obtaining images of real soils 
in a format suitable for analysis, the development of image- 
processing techniques for extracting the fiactal characteristics 
of the image, the development of a rational analytical basis 
for determining the fractal dimension associated with soil 
microstructure, the analyses required to quantify the fractai 
dimension of the soil samples tested, and pararmrter studies to 
determine the effect of particle angularity, grain size distribu- 
tion and sample density on the fractal dimensions of selected 
sands. (Authors) 
956099 
Microstructural changes in sand-bentoaite soils when 
exposed to aniline 
N. Gnanapragasam, B. A. G. Lewis & R. J. Finno, Journal 
of Geotechnicuf Engineering - ASCE, 121(2), 1995, pp 119- 
125. 
Bentonite was exposed to aniline through batch experiments 
and flexible wag conductivity tests. The mineralogy and 
microstructure and of the samples were studied using X-ray 
diffraction, infrared spectroscopy, scanning electron micro- 
scopy, and mercury intrusion porosimetry, before and after 
aniline exposure. Results indicated that the mineralogical 
structure of the clay mineral was unat%cted by the exposure 
to aniline, despite evidence that aniline adsorbed onto 
bentonite upon contact. (from Authors)