BazTech - Yadda

Ograniczanie wyników

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Iron-containing phases in metallurgical and coke dusts as well as in bog iron ore

Szumiata T., Rachwał M., Magiera T., Brzózka K., Gzik-Szumiata M., Gawroński M., Górka B., Kyzioł-Komosińska J.

Nukleonika

2017

Vol. 62, No. 2

187--195

Several samples of dusts from steel and coke plants (collected mostly with electro filters) were subjected to the investigation of content of mineral phases in their particles. Additionally, sample of bog iron ore and metallurgical slurry was studied. Next, the magnetic susceptibility of all the samples was determined, and investigations of iron-containing phases were performed using transmission Mössbauer spectrometry. The values of mass-specific magnetic susceptibility  varied in a wide range: from 59 to above 7000 × 10−8 m3kg−1. The low values are determined for bog iron ore, metallurgical slurry, and coke dusts. The extremely high  was obtained for metallurgical dusts. The Mössbauer spectra and X-ray diffraction patterns point to the presence of the following phases containing iron: hematite and oxidized magnetite (in coke and metallurgical dusts as well as metallurgical slurry), traces of magnetite fi ne grains fraction (in metallurgical dusts), amorphous glassy silicates with paramagnetic Fe3+ and Fe2+ ions, traces of pyrrhotite (in coke dusts), α-Fe and nonstoichiometric wüstite (in metallurgical slurry), as well as ferrihydrite nanoparticles (in bog iron ore). For individual samples of metallurgical dusts, the relative contributions of Fe2+/3+ ions in octahedral B sites and Fe2+ ions in tetrahedral A sites in magnetite spinel structure differs considerably.

The foot deformity versus postural control in females aged over 65 years

Drzal-Grabiec J., Rachwał M., Trzaskoma Z., Rykała J., Podgórska I., Cichocka I., Truszczyńska A., Rąpała K.

Acta of Bioengineering and Biomechanics

2014

Vol. 16, no. 4

75--82

Purpose: Correct foot structure is important due to locomotion and postural stability. The aim of this study was to determine the relationships between morphological foot structure and balance indices in a quiet standing position in women over 65 years of age. Methods: The study included 116 women aged 65-90 years. The mean age was 70.6±8.4 years and BMI 29.1±3.4 m/kg2. The measured indices included postural control while standing on both feet and photogrammetric foot evaluation. An analysis was performed of the selected foot and balance indices. Results: There were no significant differences observed in the feet structure. Certain correlations between some foot indices and the indices of postural control were noted. The increased differences in the width indices between the right and the left foot lead to balance deterioration. Larger angles of valgity and varus deformity of toes and indices describing the longitudinal arch and transverse front arch of the foot have the greatest impact on the deterioration of balance in the medio-lateral axis. Conclusions: The differences between the indices and morphological indices for the right and the left foot are not significant, which indicates the proportionate formation of feet in the individual life. The increased differences in the width indices between the right and the left foot lead to balance deterioration. Larger angles of valgity and varus deformity of toes and indices describing the longitudinal arch and transverse front arch of the foot have the greatest impact on the deterioration of balance in the medio-lateral axis.

Changes in magnetic susceptibility of forest soils along the west and south border of Poland

Strzyszcz Z., Rachwał M.

Archives of Environmental Protection

2008

Vol. 34, no. 1

71-79

The aim of the present study was to estimate the magnetic susceptibility of the boundary area of western and southern Poland. The investigation was carried out in woodlands of chosen forest districts. Samples were collected selectively from the occurring genetic horizons of pit soils. The low-field magnetic susceptibility was obtained in the laboratory using the MS2B Bartington apparatus. Heavy metal content (Fc, Zn, Pb and Cu) was analyzed using AAS method, after the mineralization in the 70% HCIO_4 + HNO_3 solution. The magnetic susceptibility results arc very diverse and above 80% of them exceed 50-10^-8 m^3/kg, that is, a border value suggesting an occurrence of a magnetic anomaly. Heavy metal content varies in a wide range and the highest values arc observed in mountainous areas, where the impact of geological structure is visible. Obviously, the input of dust emissions is significant, what is confirmed by well and positive values of correlation coefficients between magnetic susceptibility and heavy metal content (especially lead) in the area of cluster III.

Celem prezentowanych badań było określenie wielkości podatności magnetycznej obszarów przygranicznych Polski zachodniej i południowej. Badania prowadzono na obszarach leśnych w wybranych nadleśnictwach. Próbki pobierano selektywnie z występujących poziomów genetycznych odkrywek glebowych. Niskopolową podatność magnetyczną zmierzono w laboratorium przy użyciu aparatury MS2B Bartington. Zawartość niektórych metali ciężkich (Fe, Zn, Pb i Cu) oznaczono metodą ASA po uprzedniej mineralizacji próbek roztworem 70% HClO_4 + HNO_3. Wyniki badań podatności magnetycznej są bardzo zróżnicowane, ale w ponad 80% próbek jej wartości przekraczają 5010^-8m^3/kg, czyli wartość, powyżej której można się spodziewać występowania anomalii magnetycznej. Zawartość metali ciężkich waha się w szerokim zakresie, przy czym najwyższe wartości obserwuje się w rejonach górskich, gdzie wpływ na ich zawartość ma budowa geologiczna. Jednak wysokie współczynniki korelacji między podatnością magnetyczną a zawartością metali ciężkich w rejonie badań III wskazują emisje pyłów przemysłowych jako źródło metali ciężkich, zwłaszcza ołowiu.