română DANIELA LAURA BURUIANĂ, ŞTEFAN BALTĂ, CĂTĂLINA ITICESCU, LUCIAN P. GEORGESCU, DĂNUŢ LEFTER, INA I. HUMENIUC
Abstract
The paper presents the study of crops in rural areas along the Siret River basin near the industrial area of Galati, affected by heavy metal pollution.
The city of Galaţi is situated in the geographic center of the largest hydrographic basin in Europe being in the same time, together with Brăila city one of the most important industrial area in Romania. The present research in are on multicriterial monitoring points complex with prognosis using Kriging method. Interpolation methods estimate the values in unsampled locations. The mapping and spatial analysis often requires converting the field measurements into continuous space.
Keywords
kriging, pollution, soil, vegetation
LAVINIA GABRIELA POPESCU , FLORIAN ZAMAN, ENIKÖ VOLCEANOV, ILDIKO ANGER, MIRCEA MIHALACHE, EUGENIA GAMENT
Abstract
This approach is dealing with the recovery procedure of LF slags in agriculture as acid soils amendments. LF slag (slag from secondary treatment of steel) occurs in the form of a powdery material.
By using these slags in improving of acid soils seeks the calcium oxide high basicity from the slag, so this type of slags can be an active amendment in acidic soil treatment technologies.
We have identified various sources of LF slag, such as: 1) steel manufacturer for fabrication of equipments for energy industry, 2) alloyed steel manufacturer for the production of rolling stocks and 3) manufacturer of long semi-finished steel products.
LF slag collected samples was done in order to establish uniform sample batches.
The replacement of natural materials used to relieve acid soil with an unconventional material, like waste - slag LF was effective and leads to positive environmental effects.
Keywords
ladle furnace, LF slag, amendent, acid soil
DOREL RADU, ZENO GHIZDĂVEȚ
Abstract
Nowadays clinker processing technology has been, already, reached the highest performance level that can be attained in industry. No significant improvements of a constructive/functional type of the present day’s best clinkering plants can be foreseen in the next future. As a consequence, further fuel savings can be obtained by, only, a proper selection of the raw materials that require less heat in order to obtain clinker. The evaluation of the burnability of the raw mix, either by computing or experimentally, provides the most valuable information from both scientifical and industrial viewpoints. In this paper, we briefly analyze existing theoretical indices used for evaluating burnability; afterwards, we explore the possibile interrelations among them. In that purpose, a comprehensive database of 119 raw mixes from both industry and laboratories, from Romania and abroad were used in this investigation.
Keywords
clinker, burnability, correlations
MARIA COLIE, DAN MIHĂIESCU, ADRIAN SURDU, ANTON FICAI, DANIELA ISTRATI, ECATERINA ANDRONESCU
Abstract
In this paper we describe the synthesis of superconductor powder by a modified autocombustion route. The purpose was to obtain YBa2Cu3O7-δ with nanosized crystallites by a new synthetic pathway, since the literature data reported so far are limited, using stoichiometric amounts of yttrium acetate with barium and copper nitrate without the addition of organic fuel. The auto-combustion reaction transformed the precursor gel into a dark-brown ash powder, during an intense self-ignited exothermic reaction. After calcination at 900oC the obtained black powder was sintered using Spark Plasma Sintering (SPS) at 510oC. The final material was analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS).
Keywords
autocombustion, acetate-nitrate, supraconductors, plasma sintering