Wyniki wyszukiwania - BazTech

1

Rock type discrimination using Landsat-8 OLI satellite data in mafic-ultramafic terrain

Tamilarasan Kuppusamy, Anbazhagan Siddan, Ranjithkumar Sundararajan

Geology, Geophysics and Environment

|

2023

|

Vol. 49, no. 3

281--298

EN

The mafic-ultramafic terrain of the Bhavani complex in southern India is considered for lithological mapping. The Landsat-8 OLI satellite data was used for the interpretation of different rock types in the study area. The satellite data were digitally processed using ENVI 5.6 image processing software. In the OLI data, excluding bands 8 and 9, the remaining seven bands were used for the generation of colour composite images, band ratios, principal component analysis and SVM classification. Reflectance spectral measurements were carried out in laboratory conditions for five rock samples collected from the study area. The XRF analysis was carried out to estimate the composition of major oxides present in the rock samples. The results obtained from XRF analysis were compared with the rock spectra in characterizing the spectral features of the rock types. The colour composite images (B543, B567, B456, and B457), PCA composite image (PC312 and PC456), band ratios (BR5/5 and BR4/3), colour composite images from band ratios, and SVM classified output are useful in delineation various rock types in the terrain.

2

Application of neural networks in diagnostics of chemical compounds based on their infrared spectra

Macek-Kamińska K., Stemplewski S.

Ecological Chemistry and Engineering. S

|

2017

|

Vol. 24, nr 1

107--118

EN

The paper presents possibilities of using the so-called „finger-print“ identification method and artificial neural network (ANN) for diagnosis of chemical compounds. The construction of a tool specifically developed for this purpose and the ANN, as well as the required conditions for its proper functioning were described. The identification of chemical compounds was tested in two different ways for proving correctness of the assumptions. First of all, initial studies were carried out with the objective to verify the proper functioning of the developed procedure for IR spectrum interpretation. The second research stage was to find out how the properties of artificial neural networks will satisfy identification or differentiation in case of spectra with very similar structures or for mixtures consisting of several chemical compounds. Interpretation of infrared spectra of mono-constituent substances was successfully performed for both - the training and test data. Interpretation process of infrared spectra of bi-component substances, based on the example of structurally related compounds obstructing identification process, should also be described as positive. The model was able to interpret spectra of mixtures, which were previously registered into the database. Unfortunately, the program is not always able to determine which chemical substances reflect their presence in the infrared spectrum of ternary mixtures. During the research tests, it was also noted that the more complex the structure of a substance being present in the mixture was, the more difficult the interpretation of the spectra to be carry out properly by the program was. On the other hand, positive results were obtained for mixtures of compounds with not so complex structure. It must be emphasized that the results so far are promising and more attention should be paid to them in further studies.

3

Zastosowanie przybliżonych modeli SSI w przypadku wstrząsów górniczych

Kuźniar K., Tatara T.

Przegląd Górniczy

|

2015

|

T. 71, nr 10

25--30

PL

W pracy dokonano przeglądu wybranych, proponowanych w literaturze, przybliżonych, prostych modeli uwzględniających zjawisko współpracy podłoże-budynek (j. ang.: soil-structure interaction – SSI) podczas trzęsień ziemi. Analizowano przydatność tych modeli do prognozowania różnic między jednocześnie zachodzącymi drganiami gruntu obok budynku i fundamentu budynku, których źródłem były wstrząsy górnicze w Legnicko-Głogowskim Okręgu Miedziowym (LGOM). Skupiono się na ocenie dokładności modeli w przypadku ich stosowania do wyznaczania relacji odpowiednich spektrów odpowiedzi: bezwymiarowych przyśpieszeniowych spektrów odpowiedzi (β) oraz wymiarowych przyśpieszeniowych spektrów odpowiedzi (Sa) od drgań poziomych. Pod uwagę wzięto różnego typu budynki.

EN

This paper presents the selected, proposed in the literature, approximate, simple models which take into account the phenomenon of soil-structure interaction (SSI) during earthquakes. The usefulness of these models for the prediction of the differences between mine-induced vibrations in the Legnica-Glogow Copperfield (LGOM) occurring at the same time on the ground near the buildings and building foundations is analysed. The focus is on the evaluation of the accuracy of the models in the case of their application for the estimation of the relation (ratio) between the corresponding response spectra: non-dimension acceleration response spectra (β) as well as dimension averaged acceleration response spectra (Sa) from the horizontal vibrations. Various types of buildings are taken into account.

4

Electroluminescence of Y2O3:Eu and Y2O3:Sm films

Rodionov V. E., Shmidko I. N., Zolotovsky A. A., Kruchinin S. P.

Materials Science Poland

|

2013

|

Vol. 31, No. 2

232--239

EN

Electroluminescence of Y2O3:Eu and Y2O3:Sm films, as well as the films coactivated with Eu and Sm, is studied. The electroluminescence spectra are measured. The physical mechanism of electroluminescence is analyzed It is shown that the increase in the heat treatment temperature and the content of doping impurities of the films enhances the intensity of electroluminescence. Additional doping of Y2O3:EuF3 films by the SmF3 impurity, practically does not influence the emission spectrum.

5

Identification of chemical compounds on the basis of their chemical spectra in infrared

Stemplewski S.

Zeszyty Naukowe. Elektryka / Politechnika Opolska

|

2010

|

z. 63

53-54

EN

The article presents methods for identifying chemical compounds on the basis of their spectrums in Infrared. Specifically, transformation of the spectra from absorbing to transmitting ones and vice verse and calculation of the so-called base line and the maxima of the spectra are considered.

6

Synthesis, Characterization and Anti-inflammatory Activity of Some Organotin(IV) Complexes

Rehman W., Rehman S., Muhammad B., Shah S. T., Tauseef I., Guo C. -Y.

Polish Journal of Chemistry

|

2009

|

Vol. 83, nr 12

2043-2049

EN

The synthesis and characterization of new coordination compounds of some organotin(IV) chlo rides with fexofenadine are reported; the ligand molecules appear to be bound to the tin atom through carbonyl oxygen atom. The structure of the synthesized compounds has been characterized by elemental analyses, and bonding in these complexes is discussed in terms of their IR, 1H NMR and through Mössbauer studies. The spectroscopic results obtained are in full agreement with the proposed 1:1 stoichiometry. The synthesized complexes have been screened for anti-inflammatory effect. The results obtained showed that triphenyltin(IV) derivatives of fexofenadine exhibited promising anti-inflammatory effect as compared to the other tin(IV) derivatives of the same ligand.

7

Polarized phase functions in oil-in-water emulsion

Otremba Z., Piskozub J.

Optica Applicata

|

2009

|

Vol. 39, nr 1

129-133

EN

Results of modeling of polarized phase functions (PPFs) in water polluted by oil-in-water emulsion are presented. The shapes of PPFs for various oil droplets size distributions and for two optically different oil types are shown for various wavelengths in the visible region. It is revealed that PPFs for two perpendicular planes are different for angles greater than 50° (with even 2-fold difference close to 90°). Shapes of PPFs depend on the type of oil and on wavelength; oil droplets size distribution plays a minor role only.

8

Oil-in-water emulsion as a modifier of water reflectance

Otremba Z.

Optica Applicata

|

2009

|

Vol. 39, nr 1

123--128

EN

The paper presents a component of the water reflectance in the visible region, stimulated by oil-in-water emulsion in the concentration of 1 ppm. A proxy for reflectance which is in use in oceanic optics has been studied. A significant change in reflectance for water contaminated by oil emulsion is revealed. In general, the reflectance generated by oil emulsion grows with light wavelength increase and in cases when small oil droplets dominate in oil-emulsion.

9

Pomiary temperatury łuku palącego się w szczelinie międzystykowej aparatów elektrycznych za pomocą spektrofotometru światłowodowego

Żukowski P., Kozak C., Karwat C.

Pomiary Automatyka Kontrola

|

2008

|

R. 54, nr 10

682-685

PL

W artykule opisano spektrofotometryczną metodę określania temperatury łuku elektrycznego palącego się w szczelinie międzystykowej łącznika na podstawie zarejestrowanych widm ciągłych, oraz wpływ rodzaju materiału styków i ich cech konstrukcyjnych na jej wartość.

EN

The article presents a spectrophotometric method for determining temperature of electric arc burning in an inter-contact gap of a switch based on recorded continuous spectra. Influence of the material and design of the contacts on the temperature values is also discussed.

10

Efekty anomalnej absorpcji w widmach promieniowania X związków na bazie krzemu i itru.

Żelechower M.

Inżynieria Materiałowa

|

2002

|

R. XXIII, nr 3

103-105

PL

Pomiary widm promieniowania X ceramiki sialonowej domieszkowanej itrem, których wyniki przedstawiono we wcześniejszej pracy [1], pozwoliły na zaobserwowanie efektu całkowitej absorpcji promieniowania L alpha itru w badanym materiale. Dlatego zdecydowano się na przeprowadzenie eksperymentu modelowego pomiaru natężenia linii L alfa i K alfa itru w układzie: warstwa krzemu o grubości d~1 mikrometr naniesiona próżniowo na podłoże Y2O3. Eksperyment wykonano przy użyciu skaningowego mikroskopu elektronowego sprzężonego ze spektrometrem promieniowania X z dyspersją energii. Zaobserwowano całkowitą absopcję linii L alfa itru, podczas gdy linia K alfa itru była widoczna w widmie. Jako jedyne możliwe wyjaśnienie tej obserwacji przyjęto całkowite pochłanianie linii L alfa itru na krawędzi absorpcji K krzemu. Uzyskane wyniki prowadzą do wniosku, że dla pewnych układów pierwiastków (Si-Y, Mg-Se, Cl-Pd) możliwa jest całkowicie błędna interpretacja wyników uzyskanych między innymi metodą mikroanalizy rentgenowskiej (gdyż absorpcja promieniowania X jest zjawiskiem wtórnym, niezależnym od metody wzbudzania promieniowania X). Natomiast możliwość poprawnej oceny ilościowej stężenia itru, selenu i palladu w tych układach na podstawie natężenia linii L alfa staje się bardzo problematyczna. Ponieważ silne pochłanianie na krawędziach absorpcji w układach omawianych powyżej powinno prowadzić do wzrostu fluorescencji określonego pierwiastka lekkiego, również stężenia krzemu, magnezu i chloru mogą być oceniane błędnie.

EN

Energy dispersive and wavelength dispersive X-ray spectra of yttrium doped sialon ceramics were measured. The effect of the entire absorption of the yttrium L alpha line has been observed whereas the corresponding K alpha line was present in the spectra. In order to confirm these observations the model sample of thick silicon layer (~1 micrometer) on the yttrium oxide substrate (Y2O3) was prepared and X-ray spectra of the material have been acquired at various accelerating voltages. The good agreement of results obtained in the model experiment with ealier observations can be noticed. The effect of the silicon K-absorption edge on the entire absorption of the yttrium L alpha line seems to be the only one reasonable explanation of these observations. In the light of the performed experiments it can be stated that X-ray spectra of compounds containing yttrium and silicon acquired at low accelerating voltages can be totally misinterpreted (L alpha line will be entirely absorbed, K alpha line will be not excited).

11

Preparation and Thermophysical Properties of New Cobalt(II), Nickel(II) and Copper(II) Complexes

El-Tabl A., Abou-Sekkina M.

Polish Journal of Chemistry

|

1999

|

Vol. 73, nr 12

1937-1945

EN

The nickel(II) complex reacted with excess of ethylenediamine to yield a new type of macrocyclic complex. These compounds have been characterized by elemental analysis, IR, UV-Vis spectra, molar conductances, magnetic moment, mass fragmentation spectra, thermal analyses and ESR measurements.

12

X-ray crystallographic and spectroscopic investigations of copper(II) nitrate-1-allylimidazole complexes

Kurdziel K., Głowiak T.

Polish Journal of Chemistry

|

1998

|

Vol. 72, nr 9

2181-2188

EN

Copper(II) complexes Cu2L4(NO3)4 (a) and (CuL4(NO3)2 (b), where L is 1-allylimidazole, have been synthesized and characterized by elemental analysis, IR, FTIR, near IR, VIS, magnetic and crystallographic measurements. In centrosymmetric binuclear complex (a) the nitrate anions are linked to the Cu(II) cations through bidentate oxygen atoms. In complexes (b) the Cu(II) cation occupies a symmetry centre and is tetragonalbipyramid coordinated.

13

Preparation, crystal structure and properties of (Ph4P)2ReCl6x2CH3CN

Małecka J., Jaeger L., Wagner Ch., Mroziński J.

Polish Journal of Chemistry

|

1998

|

Vol. 72, nr 8

1879-1885

EN

(Ph4P)2ReCl6x2CH3CN 1 crystallizes as colourless single crystals from the acetonitrile solution of (Ph4P)2ReCl6 in ether. The crystals are monoclinic in space group P2-1/c with unit cell constants of a=9.550(1) A; b=19.724(3) A; c=15.033(2) A; beta=84.5(1)degree;V=2801.1(7) A(3); Z=2. In the octahedral anion the Re-Cl bond lengths are 2.368 A in average. the FIR region indicates two deformation bands delta(Cl-Re-Cl) at 162 cm(-1) (F-2g) and 175 cm(-1) (F-1u) and stretching band v(Re-Cl) at 309 cm(-1) (F-1u). For 1 very weak antiferromagnetic super-exchange is observed; the effective magnetic moment at room temprature is 3.57 B.M.