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Wyświetlanie 1-50 z 743
Tytuł:
Modulation index optimization for wavelength modulation spectroscopy
Autorzy:
Mohammadi, M. J.
Khorsandi, A.
Ghavami, S. S.
Powiązania:
https://bibliotekanauki.pl/articles/949416.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
wavelength modulation spectroscopy
NIR laser spectroscopy
molecular spectroscopy
Opis:
In this work, the second-harmonic component of wavelength modulation spectroscopy is simulated for R(22) CO2 absorption line to investigate the effect of gas temperature and pressure on the modulation index. We found that the optimum value of modulation index, that is 2.2, is not affected by temperature but gas pressure will change the optimized modulation index. Specifically, when the gas pressure decreased to lower pressures of less than 100 mbar, the modulation index is also decreased and tended exponentially to about two. Accordingly, the optimum value of modulation index is recalculated for a range of CO2 gas pressures to establish a nearly zero pressure deviation in the spectroscopy of very low pressure samples.
Źródło:
Optica Applicata; 2016, 46, 4; 639-650
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Mössbauer spectrometer MsAa-4
Autorzy:
Górnicki, R.
Ruebenbauer, K.
Powiązania:
https://bibliotekanauki.pl/articles/147400.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
gamma-ray spectroscopy
Mössbauer spectroscopy
spectrometers
Opis:
A description of the Mossbauer spectrometer MsAa-4 is given. The spectrometer has a modular design and it could be used as the gamma-ray spectrometer as well. It has almost entirely digital design to assure stability and repeatability. It is powered via the rechargeable battery to make it immune to the power failures. All settings are performed remotely over the Ethernet link used also to transfer data and spectrometer functions. External CAN bus could be used to attach auxiliary equipment. The status of the external equipment could be used to control spectrometer functions. Internal digital oscilloscope monitors vital functions of the spectrometer over the Ethernet link. Driving software operates under Microsoft Windows registered trademark systems and it is fully compatible with the Mosgraf-2009 data processing suite.
Źródło:
Nukleonika; 2013, 58, 1; 17-21
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustical Spectroscopy of Carbohydrate Aqueous Solutions: Saccharides; Alkyl Glycosides; Cyclodextrins. Part I. Conformer Variations
Autorzy:
Kaatze, U.
Powiązania:
https://bibliotekanauki.pl/articles/177869.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustical spectroscopy
non-equilibrium spectroscopy
carbohydrate solutions
Opis:
Acoustical attenuation spectra in the frequency range 12 kHz – 2 GHz and nonequilibrium time domain measurements are briefly reviewed for aqueous solutions of various mono- and disaccharides as well as alkyl glycosides. Several relaxation regimes emerge with relaxation times between 10^-11 s and 10^3 s. In this paper relaxation terms reflecting conformational changes are discussed, particularly mutarotation (10^3 s), chair-chair ring inversion (1 ąs), two modes of pseudorotation (100 ns, 10 ns), disaccharide ring isomerisation (10 ns), and exocyclic side group rotation (1 ns).
Źródło:
Archives of Acoustics; 2010, 35, 4; 715-738
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of low doses of gamma rays on the stability of normal and diabetic erythrocytes
Autorzy:
Kaczmarska, Magdalena
Kopyściańska, Zofia
Fornal, Maria
Grodzicki, Tomasz
Matlak, Krzysztof
Korecki, Józef
Burda, Květoslava
Powiązania:
https://bibliotekanauki.pl/articles/1039830.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
γ rays
diabetes
absorption spectroscopy
Mössbauer spectroscopy
hemoglobin
erythrocytes
hemolysis
Opis:
We studied the influence of low doses of γ radiation (from 0.04 to 1.8 mGy) on the stability of human red blood cells (RBC) from healthy donors and diabetic patients using absorption spectroscopy. Because of the alteration of many enzymatic pathways in diabetic RBCs resulting in strong modification of the lipid and protein membrane components one could expect that the ionizing γ-radiation should influence the stability of the healthy and diabetic cells in a different way. Indeed, distinct discontinuities and monotonic changes of hemolysis detected in the healthy and diabetic RBCs suggest that various enzymatic and chemical processes are activated in these membranes by γ radiation. Mössbauer measurements showed that only the highest applied dose of γ radiation caused modification of hemoglobin in both types of RBCs.
Źródło:
Acta Biochimica Polonica; 2011, 58, 4; 489-496
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Overview of the application of laser - based techniques in plasma - wall interaction research program at IFPiLM
Autorzy:
Kubkowska, M.
Gąsior, P.
Czarnecka, A.
Rosiński, M.
Wołowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/147816.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
plasma-wall interaction
plasma spectroscopy
laser-induced breakdown spectroscopy (LIBS)
Opis:
The purpose of this paper is to give an overview of the progress in the application of the laser-based techniques which has been achieved in the research in the field of plasma-wall interaction (PWI) at the Division of Laser-Produced Plasmas (DLPP), Institute of Plasma Physics and Laser Microfusion (IFPiLM, Warsaw, Poland) since 2005. The evolution of the experimental set-up which started in a simple configuration for the laser ablative co-deposit removal is presented with stress on the milestones which led to subsequent modifications, namely installation of laser induced breakdown spectroscopy (LIBS), fast HR (high resolution) CCDs, pulsed fiber-laser and the common triggering system.
Źródło:
Nukleonika; 2012, 57, 2; 163-166
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shock heterogeneity and shock history of the recently found ordinary Csátalja chondrite in Hungary
Autorzy:
Kereszturi, A.
Fintor, K
Gyollai, I.
Kereszty, Z.
Szabo, M.
Szalai, Z.
Walter, H.
Powiązania:
https://bibliotekanauki.pl/articles/2059757.pdf
Data publikacji:
2018
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
meteorite
shock impact alteration
ordinary chondrite
infrared spectroscopy
Raman spectroscopy
Opis:
Shock impact-produced mineral alterations in two thin sections of the recently found Csátalja H4 ordinary chondrite meteorite are compared. Peak positions of Raman and infrared spectra of mineral clasts show peaks shifted in wavenumber relative to unshocked reference minerals, and both peak shifts and FWHM values seem to correlate to each other. In the less shocked thin section (Csátalja-1) a more monomineralic and homogeneous composition indicate shock pressures of <15 GPa, while the more shocked Csátalja-2 indicates shock pressure in the 15–17 GPa range. The highest identified infrared peak position shifts range between –48 and +28 cm–1 with peak broadening between 60–84 cm–1 in the case of the feldspars, which, together with sulphide globules, were produced by the shock itself. Feldspar spectra could be detected only by FTIR spectroscopy, but in most cases (above the S3 shock level) the mixed type of the pyroxene-feldspar spectra (both peaks in the same spectra) is in agreement with the shock-produced secondary feldspars. These grains are located around crystalline borders, and probably formed by selective melting, due to shock annealing. In reconstruction of the shock history, an early fragmentation by a lower shock effect and a later increased shock level-related vein and melt pocket formation occurred, with subsequent shock annealing; temporal reconstruction of the shock event is possible only in part. The joint usage of Raman and infrared spectroscopy provided useful insights into the shock-produced changes and their spatial inhomogeneity, while shocked feldspar could be better detected by infrared than by the Raman method.
Źródło:
Geological Quarterly; 2018, 62, 2; 433--446
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Annealing, Stoichiometry, and Surface on Magnetism of (Pr,Dy)FeCoB Microparticles Ensemble
Autorzy:
Kablov, E. N.
Ospennikova, O. G.
Kunitsyna, E. I.
Piskorskii, V. P.
Korolev, D. V.
Morgunov, R. B.
Powiązania:
https://bibliotekanauki.pl/articles/356579.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rare earth metals
magnets
magnetisation
Mössbauer spectroscopy
X-ray spectroscopy
Opis:
Magnetic properties of powder (Pr,Dy)FeCoB ferrimagnetic alloys and effects of annealing, surface states were analyzed. X-ray photoelectron spectroscopy and Mössbauer spectra of powders indicate the effect of surface states on phase composition and magnetic properties of the studied powder, if particles average size is smaller than 10 μm. Effect of stoichiometry on magnetic anisotropy was found. Thermal stability of anisotropy field was proved by replacement of Fe atoms with Co atoms.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1923-1930
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyka powierzchni materiałów nanostrukturalnych z użyciem powierzchniowo wzmocnionej spektroskopii ramana
Characterization of nanostructured materials surfaces with surface-enhanced raman spectroscopy
Autorzy:
Chlebda, D. K.
Powiązania:
https://bibliotekanauki.pl/articles/134722.pdf
Data publikacji:
2016
Wydawca:
ADVSEO
Tematy:
surface-enhanced Raman spectroscopy
nanostructured metal
SERS
surface spectroscopy
catalysis
nanomaterials
Opis:
Nowadays, surface-enhanced Raman spectroscopy (SERS) is being considered as a rapid and powerful vibrational spectroscopy technique for chemical analysis of materials. The Very high incensement in the intensities of the Raman signal allows for application of that method for chemical analysis of nanostructured surfaces covered with suitable enhancing substrates. For SERS measurements, the substrate plays an essential role because it provides a localized metal surface plasmon resonance enhancement of analyte molecules. Moreover, the use of SERS has a great potential to overcome the Raman spectroscopy weaknesses connected with intensity problems and, therefore, can be applied to the field of heterogeneous catalysts. This article reviews the application of nanoparticles substrates as a ground for SERS enhancement. The article also focuses on the recent progress in SERS characterization of catalytic materials. Recent developments in the field of catalytic material characterization for selected tested molecules allow for performing valuable and reproducible SERS experiments on working catalysts in the reaction environment.
Źródło:
Technical Issues; 2016, 1; 8-13
2392-3954
Pojawia się w:
Technical Issues
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie olejów napędowych metodą dielektrometrii opartą na spektroskopii impedancyjnej
Evaluation of diesel fuels using dielectric spectroscopy
Autorzy:
Macioszek, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/155862.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
dielektrometria
spektroskopia impedancyjna
olej napędowy
dielectric spectroscopy
impedance spectroscopy
diesel fuel
Opis:
W pracy podjęto próbę oceny przydatności dielektrometrii w badaniu właściwości olejów napędowych typu premium. Przy użyciu systemu pomiarowego do spektroskopii impedancyjnej wykonano wstępne badania, na podstawie których wyznaczono względną przenikalność elektryczną badanych próbek. Wyniki badań pozwalają stwierdzić, że przy uwzględnieniu pewnych ograniczeń, dielektrometria oparta o spektroskopię impedancyjną może pozwolić na analizę olejów napędowych.
In the paper an attempt was made to evaluate the diesel fuels using dielectric spectroscopy to verify experimentally that it can be used to characterize these fuels. Five samples of winter premium diesels from different vendors were examined. Impedance of diesel fuels was measured in the frequency range of 0.01 Hz – 5 kHz with the use of EG&G/Princeton Applied Research laboratory system for impedance spectroscopy. Measurement results are presented in the form of Bode plot in Fig. 1. Complex resistivity of the samples was calculated on the basis of measured impedance and is presented on fig. 2. The simplest electrical equivalent circuit of the measuring cell (parallel R-C circuit) was used to calculate the capacitance and thus dielectric constant of diesel fuels (expression 5) from the collected measurements of impedance. Dielectric constant of diesel fuels’ samples is presented in Fig. 3. In the Fig. 1 and 2 one can notice a diversity in the obtained results that depend on the supplier and hence the exact chemical composition of the tested diesel. This diversity is not so noticeable in Fig. 3 what may be very important in cases when dielectric spectroscopy is used to detect some substances that can be harmful for the engine. The tests’ findings show that dielectric spectroscopy can be used to determine some of the properties of diesel fuels. Ability to detect additional substances in diesel would however depend on the difference in values of dielectric constant of the matters.
Źródło:
Pomiary Automatyka Kontrola; 2014, R. 60, nr 11, 11; 942-944
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Własności spektroskopowe kompleksów utworzonych przez tlenek grafenu i pochodną porfiryny z grupą arylową
Spectroscopic properties of the complexes formed by graphene oxide and derivative of porphyrin with aryl groups
Autorzy:
Rosiak, N.
Bogucki, A.
Świetlik, R.
Lewandowska, K.
Powiązania:
https://bibliotekanauki.pl/articles/134764.pdf
Data publikacji:
2017
Wydawca:
ADVSEO
Tematy:
Graphene Oxide
porphyrin
hybrid system
photovoltaics
UV-Vis spectroscopy
infrared spectroscopy
Opis:
Hybrid systems based on graphene oxide (GO) modified by organic molecules with the properties of donor and acceptor are very popular. The researches made in the last few years show that these structures have a really interesting photoelectrochemical properties. The ability of graphene oxide to effectively capture electrons, e.g. of porphyrins suggests the potential use of such materials in photovoltaics and molecular optoelectronics. This implies that further research of this group of molecular materials is very important from the point of view of their applications in diodes and transistors. The goal of the research was to create new hybrid systems with donor-acceptor properties, consisting of graphite oxide and porphyrin 5,10,15,20-Tetrakis (4-hydroxyphenyl) -21H, 23H-porphine. The resulting hybrid structure has been characterized by spectroscopic investigation in a wide spectral range from ultraviolet to infrared.
Źródło:
Technical Issues; 2017, 2; 16-22
2392-3954
Pojawia się w:
Technical Issues
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modification of Optical, Electronic and Microstructural Properties of PET by 150 keV Cs+ Irradiation
Autorzy:
Musiatowicz, Michał
Turek, Marcin
Droździel, Andrzej
Pyszniak, Krzysztof
Grudziński, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/2206284.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
polymer modification
PET
ion implantation
FTIR spectroscopy
Raman spectroscopy
conducting layer
Opis:
Thick (0.125 mm) sheet samples of PET were irradiated with 150 keV Cs+ ion beam with fluences in the range from 10^13 cm^-2 up to 10^16 cm^-2). Raman and UV-VIS spectroscopy measurements shown destruction of numerous bonds within the polymer – this effect intensifies with fluence. Raman spectroscopy shows the presence of amorphous graphitelike structures as the broad G band appears in the collected spectrum. The analysis of absorbance spectra also confirms formation of numerous carbon clusters leading to a formation of vast conducting structures in the modified layer of the polymer. One can observe the decrease of optical bandgap from 3.85 eV (typical for pristine PET) to 1.05 eV for the sample implanted with the highest fluence, the effect is weaker than for lighter alkali metal ions. The estimated average number of C atom in a clusters reaches in such case values close to 1100. The changes in the polymer structure lead to intense reduction of electrical sheet resistivity of the modified samples by ~ 8 orders of magnitude in the case of severely modified sample. The dependence of resistivity on temperature has also been measured. The plots of ln(σ) vs 1/T show that band conductivity or nearest neighbor hopping between conducting structures prevail in the considered case
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 5; 11-19
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wstępne wyniki pomiarów mössbauerowskich próbki meteorytu Pułtusk otrzymanych w temperaturze pokojowej (300 K) oraz temperaturze ciekłego azotu (80 K)
Preliminary results of Mössbauer measurements of Pułtusk meteorite performed at room temperature (300 K) and at temperature of liquid nitrogen (80 K)
Autorzy:
Duda, Przemysław
Kazulo, Paweł
Setniewski, Adrian
Bogusz, Patrycja
Woźniak, Marek
Powiązania:
https://bibliotekanauki.pl/articles/1033101.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Mössbauer spectroscopy
Pultusk meteorite
Opis:
Mössbauer measurements of one sample of the Pułtusk meteorite were performed at room temperature (300 K) and at temperature of liquid nitrogen (80 K). Following mineralogical phases were identified in Mössbauer spectra: olivine, pyroxene, troilite, kamacite, taenite, and a doublet associated with ferric iron. The differences in the percentage of spectral areas obtained for all subspectra are very small. It means that in the range of these temperatures the Debye–Waller factor is the same for all mineralogical phases present in the investigated sample.
Źródło:
Acta Societatis Metheoriticae Polonorum; 2018, 9; 48-53
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fibrous structures based of natural polymers for tissue engineering applications
Autorzy:
Stodolak-Zych, E.
Ścisłowska-Czarnecka, A.
Kolesinska, B.
Cieślak, M.
Puchowicz, D.
Kaminska, I.
Bogun, M.
Powiązania:
https://bibliotekanauki.pl/articles/285455.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
polymers
tissue engineering
spectroscopy
Źródło:
Engineering of Biomaterials; 2018, 21, 148; 63
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibrational spectroscopy investigation of montmorillonite-chitosane nanocomposite materials
Autorzy:
Paluszkiewicz, C.
Stodolak, E.
Powiązania:
https://bibliotekanauki.pl/articles/283827.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
spectroscopy
chitosan
nanocomposite materials
Opis:
Biomaterials basing on natural polysaccharides, i.e. hiauronic acid, alginate, chitosane are an alternative for already applied bioresorbable synthetic materials basing on synthetic polyhydroxy acids. Their main advantages are good accessibility, low cost, easy forming and high biocompatibility. Additionally , they are a perfect matrix for bioactive nanoparticles i.e. hydroxy apatite (HAp), tricalcium phosphate (TCP) and silica (SiO2). The work presents results of research on nanocomposite consisting of chitosane matrix (CS) modified with a nanofiller, which was natural montmorillonite (MMT). Nanocomposite foils were produced by the casting method. In order to induce better biocompatibility, the surface of the CS/MMT composite was neutralized (bath in NaOH solution). The nanocomposite foils were subjected to a bioactivity test by incubation in SBF at 37oC for 7 days. It was observed that the CS/ MMT material surface showed a local supersaturation, which was a result of apatite nucleation. The CS/ MMT nanocomposites were investigated using FT-IR ( Fourier Transform Infrared Spectroscopy) and Fourier Raman Spectroscopy. FTIR measurements o f the samples were carried out on the transmission and reflection modes. The FTIR microscopy spectra were collected using BioRad Excalibur with ATR attachment as well as microscope UMA500 equipped with MCT detector. Spectra were measure at 4 cm -1 resolution in the region from 4 000 cm -1 to 600 cm -1 . FT-Raman spectra were obtained using a FTS 6000 Bio-Rad spectrometer with Ge detector. The samples were excited with a Nd-YAG laser (1064nm). Additional all materials in all steps experiments were observed under Scanning Electron Microscopy (Nova Nano SEM). Vibrational spectroscopy methods (FT Raman and FTIR) can be used for investigation of nanocomposite foils basing on biopolymers. High sensitivity the applied spectroscopy techniques show that in the result of the neutralization of CS/ MMT foil (via incubation in NaOH solution the biopolymer chain breaks. This phenomena is visible by intensity ratio between COC/COH bands. Increase of reactivity of chitosane chain lead to entrapment of PO4+3-, which is the origin of the apatite forms nucleation process. Chemical treatment of the nanocomposite foils, i.e. NaOH washes in fluences their chemical structure and microstructure. Neutralisation of the foils is the first processing stage which precedes the potential use o fCS/ MMT foils in biomedical applications. The materials show a tendency to apatite crystallisation which may support regeneration of damaged bone tissue. The applied spectroscopic methods allowed to observe changes in the whole volume of the sample. Individual ATR measurements taken at various spectral ranges and penetration depths allow to observe subtle changes in the polymer matrix caused by chemical treatment (NaOH and SBF incubation). Results of the investigations indicate that in the CS/ MMT systems new chemical bonds and related to them vibrations appear. Quantity and quality of the interact ions is related to characteristics of the nanoparticle and the presence of forming apatite structures.
Źródło:
Engineering of Biomaterials; 2011, 14, no. 109-111 spec. iss.; 44
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of natural gas by Raman spectroscopy and its application for in-situ measurements
Autorzy:
Dąbrowski, K.
Kuczyński, S.
Włodek, T.
Smulski, R.
Barbacki, J.
Powiązania:
https://bibliotekanauki.pl/articles/298619.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
natural gas
Raman spectroscopy
Opis:
Gaseous hydrocarbons and nitrogen mixtures are characterized with an own designed portable Raman system equipped with a high pressure autoclave and fiber-optic probe. Backscattered radiation is collected through a sapphire window with a probe and transferred to the spectrometer. Samples are measured for a set of pressures in the range of 1–150 bar in ambient temperature. Measurement conditions are set to maintain an one-phase system. Spectra are collected in a wide range of wavenumber 350–3500 cm–1. Initial composition of measured samples is measured be means of gas chromatography. Design computer algorithms automatically detects and characterizes Raman bands for given species and their peak areas. The influence of both pressure and concentration of a given element on given band position and area are demonstrated.
Źródło:
AGH Drilling, Oil, Gas; 2018, 35, 1; 125-138
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase constitution of an LaFe11.0Co0.8(Si0.4Al0.6)1.2 alloy investigated by Mössbauer spectroscopy
Autorzy:
Gębara, P.
Pawlik, P.
Wysłocki, J. J.
Szwaja, M.
Powiązania:
https://bibliotekanauki.pl/articles/147912.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
magnetocaloric materials
Mössbauer spectroscopy
Opis:
In the present work the phase constitution and magnetic ordering of the magnetocaloric LaFe11.0Co0.8(Si0.4Al0.6)1.2 alloy in the as-cast state and after annealing at 1323 K for 1 h (in case of ribbons) and 49 days (in case of bulk) were studied. For bulk and ribbon samples in as-cast state three crystalline phases were identified: dominant ferromagnetic alfa-Fe, minor ferromagnetic La(Fe,Co)Si and traces of paramagnetic La(Fe,Si)13 phase. Appropriate heat treatment resulted in the evolution of phase constitution of the alloy, where two crystalline phases were developed: the dominant paramagnetic La(Fe,Si)13 phase and a minor fraction of the ferromagnetic alfa-Fe for both bulk and ribbon samples.
Źródło:
Nukleonika; 2013, 58, 1; 113-116
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technical setup and physical properties Technical setup and physical properties of a gas-liner pinch
Autorzy:
Büscher, S.
Wrubel, T.
Kunze, H.
Powiązania:
https://bibliotekanauki.pl/articles/146803.pdf
Data publikacji:
2000
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
lineshapes
spectroscopy
Z-pinch
Opis:
he present technical status and physical properties of the gas-liner pinch device in Bochum are presented and discussed. This comprises spectroscopic as well as diagnostic achievements. A short review on the measurements performed at this light source will also be given.
Źródło:
Nukleonika; 2000, 45, 3; 167-172
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Clinical application of advanced neuroimaging techniques – Magnetic Resonance Spectroscopy
Autorzy:
Guz, Wiesław
Bober, Zuzanna
Ożóg, Łukasz
Truszkiewicz, Adrian
Przypek, Aneta
Aebisher, David
Bartusik-Aebisher, Dorota
Urbanik, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/454826.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
spectroscopy
MR
SVS
CSI
Opis:
Continuous scientific research and the increasing saturation of the medical market in Poland implements the possibilities of using advanced MR techniques including MRS in everyday practice. This method, which has so far been used primarily for research purposes, can bring measurable benefits to patients not only in terms of clarifying diagnosis and narrowing differential diagnosis, but also monitoring the course of various diseases and their treatment. Here we present the basic principles of performing and interpreting spectroscopic spectra and possible clinical applications and development prospects of MRS. The literature reviewed both Polish and foreign articles both historically and in the past 10 years. The paper presents methodological issues related to the proper performance of magnetic resonance spectroscopy (MRS) and spectral composition and the role of major metabolites, as well as current clinical applications and directions of MRS development.
Źródło:
European Journal of Clinical and Experimental Medicine; 2017, 2; 133-140
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
57Fe Mössbauer study of stilpnomelane and associated chlorite from Polish granite pegmatites
Autorzy:
Malczewski, D.
Popiel, E.
Sitarek, A.
Powiązania:
https://bibliotekanauki.pl/articles/147222.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
stilpnomelane
chlorite
Mössbauer spectroscopy
Opis:
This paper reports the results of 57Fe Mössbauer study of stilpnomelane K0.6Fe6(Si8Al)(O,OH)27 .2H2O from Żółkiewka (Lower Silesia, Poland). Stilpnomelane in paragenesis with chlorite, tourmaline, claevelandite and zeolites has been found in granite pegmatites in quarries at Żółkiewka. The samples of naturally weathered stilpnomelane and chlorite from the same fragment of rock were also studied. The Mössbauer spectrum of an untreated sample could be fitted to two Fe2+ doublets and two Fe3+ doublets. The Fe2+ doublets have similar isomer shifts, but they distinctly differ in values of quadrupole splittings. Ferric iron, octahedrally coordinated occurs in three different environments represented by two doublets. The first of them, assigned to combined M1 + M2 positions and the second one assigned to M3 site with parameters IS = 0.36 mm/s and QS = 2.07 mm/s is visible in the spectra up to 880°C. This doublet is characteristic of stilpnomelane and can be regarded as a "fingerprint" of this mineral. After heating at 200°C, the relative content of Fe2+, ÓFe2+/ÓFe, decreases to 0.22 what means a 50% decrease in comparison to the initial value observed in the untreated sample. At about 1000°C, complete breakdown of the stilpnomelane structure takes place and the Mössbauer spectrum consists of two sextets and two ferric doublets. Abnormally high content of Fe2+ in naturally weathered stilpnomelane (0.70) comparing to the untreated sample of stilpnomelane (0.45) indicates that the sample had to be subjected to hydrothermal processes operating locally. Almost the same contents of divalent iron and hyperfine parameters of Fe2+ and Fe3+ doublets in weathered stilpnomelane and associated chlorite suggest that the process of chlorite transformation into stilpnomelane seems to be very probable.
Źródło:
Nukleonika; 2004, 49,suppl.3; 43-48
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of X-ray photoelectron spectroscopy (XPS) and a functional near infrared spectroscopy (fNIRS) in medicine
Autorzy:
Szklarczyk, Marek
Powiązania:
https://bibliotekanauki.pl/articles/1891232.pdf
Data publikacji:
2021-12-02
Wydawca:
Gdański Uniwersytet Medyczny
Tematy:
X-ray photoelectron spectroscopy
XPS
functional near infrared spectroscopy
fNIRS
brain activity
Opis:
The development of modern clinical medicine and the truthful medical diagnosis require hard physicochemical data. Furthermore, the social demands for more accurate and collected data, which refer to human health in real conditions and in real time, force the quest for techniques which would be possible to be applied in a broadly understood clinical field. In this article two techniques are described. A high vacuum technique which is an X-ray photoelectron spectroscopy (XPS), and a functional near infrared spectroscopy (fNIRS), which might be applied in vivo condition. For the both techniques, the results pointing their applicability in the clinical and modern biochemical research are described.
Źródło:
European Journal of Translational and Clinical Medicine; 2021, 4, 2; 86-93
2657-3148
2657-3156
Pojawia się w:
European Journal of Translational and Clinical Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examination of the Properties of Samples from Glass-Epoxy Core Rods for Composite Insulators Subjected to DC High Voltage
Autorzy:
Wieczorek, K.
Jaroszewski, M.
Ranachowski, P.
Ranachowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/351254.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
DC high voltage
composite insulator
glass-epoxy core
dielectric spectroscopy
Raman spectroscopy
Opis:
This article presents the results of an examination performed on a set of samples of glass-epoxy core rods used in composite insulators with silicone rubber housings. The goal of the examination was to test the aging resistance of the core material when exposed to Direct Current (DC) high voltage. Long term exposure of a glass-epoxy core rod to DC high voltage may lead to the gradual degradation of its mechanical properties due to the ion migrations. Electrolysis of the core material (glass fiber) may cause electrical breakdown of the insulators and consequently lead to a major failure. After being aged for 6000 hours under DC high voltage, the samples were subjected to microscopic analysis. Their chemical composition was also examined using Raman spectroscopy and their dielectric losses and conductance in the broad range of frequencies were tested using dielectric spectroscopy.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 3; 1281-1286
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Loading Effect of Ag Nanoparticles on Photocatalytic Activity of TiO2 Nanorod Arrays Prepared by Hydrothermal Method
Autorzy:
Lee, Kwangmin
Yoo, Daeheung
Zakiyuddin, Ahmad
Powiązania:
https://bibliotekanauki.pl/articles/2049271.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
TiO2 nanorods
Ag nanoparticles
hydrothermal
Electrochemical impedance spectroscopy
UV-Vis spectroscopy
Opis:
Rutile-TiO2 nanorod thin films were formed on Ti disks via alkali treatment in NaOH solutions followed by heat treatment at 700°C. Ag nanoparticles were loaded on nanorods using a photo-reduction method to improve the photocatalytic properties of the prepared specimen. The surface characterization and the photo-electrochemical properties of the Ag-loaded TiO2 nanorods were investigated using a field-emission scanning electron microscope (FE-SEM), X-ray photoelectron spectroscopy (XPS), UV-Vis spectroscopy and electrochemical impedance spectroscopy (EIS). The TiO2 nanorods obtained after the heat treatment were 80 to 180 nm thick and 1 μm long. The thickness of the nanorods increased with the NaOH concentration. The UV-Vis spectra exhibit a shift in the absorption edge of the Ag-loaded TiO2 to the visible light range and further narrowing of the bandgap. The decrease in the size of the capacitive loops in the EIS spectra showed that the Ag loading effectively improved the photocatalytic activity of the TiO2 nanorods.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 3; 751-754
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultrasonic spectroscopy of silicon single crystal
Autorzy:
Sedlak, P.
Tofel, P.
Sedlakova, V.
Majzner, J.
Sikula, J.
Hasse, L.
Powiązania:
https://bibliotekanauki.pl/articles/220554.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
non-destructive testing
silicon single crystal
electro-ultrasonic spectroscopy
resonant ultrasonic spectroscopy
Opis:
Specimens of Si single crystals with different crystal orientation [100] and [110] were studied by Electro-Ultrasonic Spectroscopy (EUS) and Resonant Ultrasonic Spectroscopy (RUS). A silicon single crystal is an anisotropic crystal, so its properties are different in different directions in the material relative to the crystal orientation. EUS is based on interaction of two signals: an electric AC signal and an ultrasonic signal, which are working on different frequencies. The ultrasonic wave affects the charge carriers' transport in the structures and the intermodulation electrical signal which is created due to the interaction between the ultrasonic wave and charge carriers, is proportional to the density of structural defects. RUS enables to measure natural frequencies of free elastic vibrations of a simply shaped specimen by scanning a selected frequency range including the appropriate resonances of the measured specimens.
Źródło:
Metrology and Measurement Systems; 2011, 18, 4; 621-630
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of quantum cascade lasers to trace gas detection
Autorzy:
Bielecki, Z.
Stacewicz, T.
Wojtas, J.
Mikołajczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/201703.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
absorption spectroscopy
biomarkers
sensors
gas sensors
cavity enhanced spectroscopy
photoacoustic spectroscopy
spektroskopia absorpcyjna
biomarkery
czujniki gazu
spektroskopia wzmocniona
spektroskopia fotoakustyczna
Opis:
The potential of Quantum Cascade Laser technology has been recently harnessed in industry, medicine and military to create a range of original infrared gas sensors. These sensors have opened up many new applications due to compact size, excellent sensitivity, robust construction and low power requirements. They rely on infrared absorption spectroscopy to determine identity and quantity of gases. The measurement of these gases has relied on different technologies including multi-pass spectroscopy, photoacoustic spectroscopy, cavity ring down spectroscopy, and their various modifications. In this review paper some technologies are described in terms of its advantages/disadvantages in many application. The results of own works about methane, ammonia, nitric oxide, nitrous oxide, and carbonyl sulfide detection are presented as well.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 2; 515-525
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Phase Transitions in BNT-BT Lead-Free Ceramics Around Morphotropic Phase Boundary by Mechanical and Dielectric Spectroscopies
Autorzy:
Silva Jr, P. S.
Diaz, J. C. C. A.
Florêncio, O.
Venet, M.
M’Peko, J. C.
Powiązania:
https://bibliotekanauki.pl/articles/353072.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Lead-free piezoelectric ceramics
morphotropic phase boundary
phase transitions
mechanical spectroscopy
dielectric spectroscopy
Opis:
In this work, the syntheses and characterization by mechanical and dielectric spectroscopies of (1-x) Bi0.5Na0.5TiO3-xBaTiO3 (BNT-100xBT), with x = 0.05, 0.06 and 0.07, lead-free piezoelectric ceramics is reported. Ceramic samples of BNT-BT have been prepared by mixed-oxide method and then conventionally sintered. X-ray diffraction patterns of sintered samples, indicated for BNT-7BT the presence of tetragonal (P4mm) complex perovskite structure, whereas for BNT-5BT and BNT-6BT the samples exhibit a mixture of tetragonal (P4mm) and rhombohedral (R3c) crystalline phases, which reveal the presence of a morphotropic phase boundary (MPB) in the BNT-BT system. Measurements of internal friction, Q-1, and the storage modulus, E’, as a function of temperature at various frequencies were carried out in a Dynamic Mechanical Analyzer (DMA), in the temperature range from 0ºC to 600ºC. Dielectric profiles are recorded in the frequency range from 1kHz to 100kHz and the temperature range from room temperature to 475ºC. Mechanical loss spectra obtained for investigated compositions of BNT-BT samples showed different frequency-independent anomalies. Two main anomalies for BNT-5BT and BNT-6BT, observed around 100ºC and 430ºC were associated with the ferroelectric-antiferroelectric and antiferroelectricparaelectric phase transitions, respectively. The results obtained from mechanical loss measurements were supported by dielectric relaxation spectra. For BNT-7BT, outside the MPB, four different frequency-independent processes were observed.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 17-20
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fast optoelectronic sensor of water concentration
Autorzy:
Nowak, J. L.
Magryta, P.
Stacewicz, T.
Kumala, W.
Malinowski, S. P.
Powiązania:
https://bibliotekanauki.pl/articles/174478.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
humidity
hygrometer
laser spectroscopy
absorption
Opis:
A prototype optoelectronic hygrometer, based on absorption of laser light tuned to a specific rovibronic absorption line of H2O at 1364.68961 nm is described. Target application is meteorology, in particular precise and fast measurements of small-scale humidity fluctuations in turbulent atmospheric flows. Tests of the prototype instrument performed in the atmospheric boundary layer have proven the advantage of this optoelectronic sensor over typical, commercially available UV hygrometers designed for similar applications.
Źródło:
Optica Applicata; 2016, 46, 4; 607-618
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyka ałtaitu z meteorytu Morasko metodą spektroskopii Ramana
Autorzy:
Runka, Tomasz
Karwowski, Łukasz
Muszyński, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1032954.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Morasko meteorite
Raman spectroscopy
altaite
Źródło:
Acta Societatis Metheoriticae Polonorum; 2012, 3; 159-160
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Response of Indium Antimonide at Sub-Terahertz and Terahertz Frequencies
Autorzy:
Yavorskiy, D.
Karpierz, K.
Grynberg, M.
Łusakowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1033781.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
THz spectroscopy
InSb THz detector
Opis:
Responsivity of a bulk InSb detector at liquid helium temperature was studied in the frequency range 0.1 THz
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 338-339
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrogen ordering effects in Laves - phase YFe2
Autorzy:
Ostrasz, A.
Powiązania:
https://bibliotekanauki.pl/articles/147886.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
hydrides
Laves phase
Mössbauer spectroscopy
Opis:
Mössbauer spectroscopy and X-ray diffraction measurements were performed before and after hydrogenation of YFe2 Laves phase in order to investigate the effect of hydrogen on their structural and magnetic properties. The experimental results show an instant change of both the lattice parameters and the hyperfine field. The results are interpreted due to the phase decomposition of the parent intermetallic in the aftermath of creation of stoichiometric hydrides YHc (c = 0.9; 2.5).
Źródło:
Nukleonika; 2013, 58, 1; 77-81
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of photoacoustic, diffuse reflectance, attenuated total reflectance and transmission infrared spectroscopy for the study of biochars
Autorzy:
Pasieczna-Patkowska, S.
Madej, J.
Powiązania:
https://bibliotekanauki.pl/articles/778581.pdf
Data publikacji:
2018
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
biochar
surface analysis
infrared spectroscopy
Opis:
Four infrared spectroscopic techniques - photoacoustic (PAS), diffuse reflectance (DRS), attenuated total reflectance (ATR) and transmission (TS) - were evaluated for the qualitative analysis of the biochar obtained from willow feedstock during pyrolysis. Increase in pyrolysis temperature resulted in more aromatic and carbonaceous structure of biochars. These changes could easily be detected from Fourier transform infrared (FT-IR) spectral differences. The comparison of the spectra obtained by the four FT-IR techniques allowed to conclude that there are differences in the spectra acquired using different IR technique caused by different signal acquisition. PAS and ATR were the best techniques used in order to obtain spectra with smooth and sharp peaks, in contrast to TS, where bands were less-separated. DRS turned out to be the weakest of all techniques, due to poor spectral quality and poor separation of the bands.
Źródło:
Polish Journal of Chemical Technology; 2018, 20, 4; 75-83
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of thermal annealing on structure and oxidation of iron nanowires
Autorzy:
Krajewski, M.
Brzózka, K.
Górka, B.
Lin, W.-S.
Lin, H. -M.
Szumiata, T
Gawroński, M.
Wasik, D.
Powiązania:
https://bibliotekanauki.pl/articles/148838.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
amorphous iron and iron oxides
iron nanowires
Mössbauer spectroscopy
Raman spectroscopy
thermal annealing
Opis:
Raman spectroscopy as well as Mössbauer spectroscopy were applied in order to study the phase composition of iron nanowires and its changes, caused by annealing in a neutral atmosphere at several temperatures ranging from 200°C to 800°C. As-prepared nanowires were manufactured via a simple chemical reduction in an external magnetic fi eld. Both experimental techniques proved formation of the surface layer covered by crystalline iron oxides, with phase composition dependent on the annealing temperature (Ta). At higher Ta, hematite was the dominant phase in the nanowires.
Źródło:
Nukleonika; 2015, 60, 1; 87-91
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advanced microstructure diagnostics and interface analysis of modern materials by high-resolution analytical transmission electron microscopy
Autorzy:
Neumann, W.
Kirmse, H.
Hausler, I.
Mogilatenko, A.
Zheng, C.
Hetaba, W.
Powiązania:
https://bibliotekanauki.pl/articles/199872.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electron microscopy
energy dispersive X-ray spectroscopy
electron energy loss spectroscopy
electron holography
Opis:
Transmission electron microscopy (TEM) is a powerful diagnostic tool for the determination of structure/property relationships of materials. A comprehensive analysis of materials requires a combined use of a variety of complementary electron microscopical techniques of imaging, diffraction and spectroscopy at an atomic level of magnitude. The possibilities and limitations of quantitative TEM analysis will be demonstrated for interface studies of the following materials and materials systems: Nickel-based superalloy CMSX-10, (Zn,Cd)O/ZnO/Al2O3, (Al,Ga)N/AlN/Al2O3, GaN/LiAlO2 and FeCo-based nanocrystalline alloys.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 2; 237-253
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mössbauer study of treated Nd2Fe14B
Autorzy:
Budzyński, M.
Constantin, V. C.
Popescu, A.-N. J.
Surowiec, Z.
Tkachenka, T. M.
Yanushkevich, K. I.
Powiązania:
https://bibliotekanauki.pl/articles/146270.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
intermetallics
intergranular corrosion
Mössbauer spectroscopy
Opis:
The Nd2Fe14B cylindrical magnets were treated with water solutions of alkali, acid, and salt. Mössbauer spectroscopy was applied to study the composition and properties of the surface material of the treated magnets. It is shown that the main phase of the permanent Nd2Fe14B magnet partly decomposes. The released α-Nd at the grain boundaries interacts with water and forms neodymium hydroxide matrix, and the released Fe diffuses into it. The presence of Fe-Nd(OH)3 is refl ected in the paramagnet doublet in the Mössbauer spectra of treated neodymium magnets.
Źródło:
Nukleonika; 2015, 60, 1; 7-10
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the influence of a carbon solid on the properties of a helium plasma in a theta pinch discharge
Autorzy:
Freese, W.
Kunze, H.
Powiązania:
https://bibliotekanauki.pl/articles/146807.pdf
Data publikacji:
2000
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
shock wave
spectroscopy
theta pinch
Opis:
A helium plasma produced in a 82 kJ theta pinch discharge has been seeded with carbon ions by a carbon solid rod positioned on the axis. The first shock front of the discharge ablates carbon atoms from the solid surface which are ionized and interact with the plasma. Some shock front properties (namely thickness, compression velocity and its shape) were analyzed with an ICCD-camera system taking 2-dimensional photos of the plasma continuum emitted along the axis with a time duration of 100 ns. While the influence on the shape was not found, the temporal behaviour was drastically changed when the rod was added. The shock front occurs earlier and compresses faster. An explanation remains to be given. Furthermore, the influence of the carbon impurities on the plasma parameters has been investigated by measuring the electron temperature and density by means of plasma spectroscopy comparing these results with those obtained from discharges in helium without rod. We found a decrease in the electron density about 500 ns after the shocked plasma has started to interact with the rod surface. Simultaneously increasing continuum emission and decreasing intensity of the HeII Pa line indicates a regime of recombination. No influence was found on the electron temperature.
Źródło:
Nukleonika; 2000, 45, 3; 173-177
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of corrosion defects in titanium by positron annihilation
Autorzy:
Pietrzak, R.
Szatanik, R.
Powiązania:
https://bibliotekanauki.pl/articles/147338.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
positron annihilation spectroscopy
corrosion defects
Opis:
The positron annihilation method was used to study the formation of defects in titanium samples during their corrosion in the vapor of a 3% HCl solution. In particular, the distribution of defects depending on the distance from the corroding surface and the impact of an external magnetic fi eld on the concentration of vacancies forming during the corrosion of titanium layers close to the surface were determined.
Źródło:
Nukleonika; 2015, 60, No. 4, part 1; 755-758
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic nanowires (Fe, Fe-Co, Fe-Ni) : magnetic moment reorientation in respect of wires composition
Autorzy:
Kalska-Szostko, B.
Wykowska, U.
Satuła, D.
Powiązania:
https://bibliotekanauki.pl/articles/148495.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
electrochemistry
electrodeposition
Mössbauer spectroscopy
nanowires
Opis:
Magnetic nanowires of Fe, Fe-Co, and Fe-Ni alloy and layered structure were prepared by electrochemical alternating current (AC) deposition method. The morphology of the nanowires in and without the matrix was studied by energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), and X-ray diffraction (XRD), respectively. The wires either show strong dependence on the combination of elements deposition (alloy or layered) or chemical composition (Co or Ni). The magnetic properties of the nanostructures were determined on the basis of Mössbauer spectroscopy (MS).
Źródło:
Nukleonika; 2015, 60, 1; 63-67
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Common Explosives in Different Solvents by Nuclear Magnetic Resonance Spectroscopy
Autorzy:
Szala, M.
Szymańczyk, L.
Powiązania:
https://bibliotekanauki.pl/articles/358931.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
NMR spectroscopy
common explosives
detection
Opis:
The results of systematic multinuclear NMR studies of 2,4,6-trinitrotoluene (TNT), 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX), 1,3,5,7-tetranitro-1,3,5, 7-tetraazacyclooctane (HMX) and 3-nitro-1,2,4-triazol-5-one (NTO) are presented. For comparison of interactions between the analytes and the solvents, experiments in both deuterated DMSO and CDCl3 (where possible) were performed. Complete assignment of the resonance signals for the compounds investigated are presented. Analysis of the high resolution NTO spectra leads to new conclusions about the different reactivities of the N-H protons. The results can be used for many analytical purposes, such as solvent matching for extracting traces of explosives, controlling the purity of various samples etc.
Źródło:
Central European Journal of Energetic Materials; 2014, 11, 1; 129-142
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Degradation process of TMC-based polymers by mass spectrometry
Autorzy:
Jaworska, J.
Kasperczyk, J.
Maksymiak, M.
Adamus, G.
Dobrzyński, P.
Powiązania:
https://bibliotekanauki.pl/articles/285848.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
polymers degradation
mass spectroscopy
oligomers
Opis:
This paper presents results of degradation process investigations of resorbable poly(lactide-trimethylene carbonate). Materials used in this work were synthesized by the ring opening polymerization. Polymerization was carried out in bulk using Zr(acac)4 as initiator. The resulting copolymers were characterized by high resolution NMR spectroscopy. Then the copolymers were allowed to degrade in H2O for 53 weeks. These conditions allowed to analyze the degradation products of poly(lactide-trimethylene carbonate) and to determine the structure of oligomers using multi-stage mass spectrometry technique (ESI-MSn). ESI-MS analysis revealed the presence of two kinds of oligomers.
Źródło:
Engineering of Biomaterials; 2012, 15, 113; 26-28
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibrational spectroscopy investigation of montmorillonite - chitosane nanocomposite materials
Autorzy:
Paluszkiewicz, C.
Stodolak, E.
Powiązania:
https://bibliotekanauki.pl/articles/283761.pdf
Data publikacji:
2010
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
biomaterials
nanocomposite materials
vibrational spectroscopy
Opis:
Biomaterials basing on natural polysaccharides, i.e. hiauronic acid, alginate, chitosane are an alternative for already applied bioresorbable synthetic materials basing on synthetic polyhydroxyacids. Their main advantages are good accessibility, low cost, easy forming and high biocompatibility. Additionally, they are a perfect matrix for bioactive nanoparticles i.e. hydroxyapatite (HAp), tricalcium phosphate (TCP) and silica (SiO2). The work presents results of research on nanocomposite consisting of chitosane matrix (CS) modified with a nanofiller, which was natural montmorillonite (MMT). Nanocomposite foils were produced by the casting method. In order to induce better biocompatibility, the surface of the CS/MMT composite was neutralized (bath in NaOH solution). The nanocomposite foils were subjected to a bioactivity test by incubation in SBF at 37oC for 7 days. It was observed that the CS/MMT material surface showed a local supersaturation, which was a result of apatite nucleation. The CS/MMT nanocomposites were investigated using FT-IR (Fourier Transform Infrared Spectroscopy) and Fourier Raman Spectroscopy. FTIR measurements of the samples were carried out on the transmission and reflection modes. The FTIR microscopy spectra were collected using Bio-Rad Excalibur with ATR attachment as well as microscope UMA500 equipped with MCT detector. Spectra were measured at 4 cm-1 resolution in the region from 4000 cm-1 to 600 cm-1. FT-Raman spectra were obtained using a FTS6000 Bio-Rad spectrometer with Ge detector. The samples were excited with a Nd-YAG laser (1064nm). Additional all materials in all steps experiments were observed under Scanning Electron Microscopy (Nova NanoSEM). Vibrational spectroscopy methods (FT Raman and FTIR) can be used for investigation of nanocomposite foils basing on biopolymers. High sensitivity the applied spectroscopy techniques show that in the result of the neutralization of CS/MMT foil (via incubation in NaOH solution) the biopolymer chain breaks. This phenomena is visible by intensity ratio between COC/ COH bands. Increase of reactivity of chitosane chain lead to entrapment of PO43-, which is the origin of the apatite forms nucleation process. Chemical treatment of the nanocomposite foils, i.e. NaOH washes influences their chemical structure and microstructure. Neutralisation of the foils is the first processing stage which precedes the potential use of CS/MMT foils in biomedical applications. The materials show a tendency to apatite crystallisation which may support regeneration of damaged bone tissue. The applied spectroscopic methods allowed to observe changes in the whole volume of the sample. Individual ATR measurements taken at various spectral ranges and penetration depths allow to observe subtle changes in the polymer matrix caused by chemical treatment (NaOH and SBF incubation). Results of the investigations indicate that in the CS/ MMT systems new chemical bonds and related to them vibrations appear. Quantity and quality of the interactions is related to characteristics of the nanoparticle and the presence of forming apatite structures.
Źródło:
Engineering of Biomaterials; 2010, 13, no. 99-101; 128
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Lanthanum Dopant on the Structure and Electric Properties of BaBi2Nb2O9 Ceramics
Autorzy:
Adamczyk-Habrajska, M.
Goryczka, T.
Szalbot, D.
Dzik, J.
Rerak, M.
Bochenek, D.
Powiązania:
https://bibliotekanauki.pl/articles/353535.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ferroelectric relaxor
ceramics
impedance spectroscopy
Opis:
The paper reports the consequences of lanthanum modifications of barium bismuth niobiate (BaBi2 Nb2 O9) ceramics. The discussed materials were prepared by solid state synthesis and a one-step sintering process. The investigations are focused on dielectric aspects of the modification. The presented results reveal that the trivalent lanthanum ions incorporate twovalent barium ions, which is connected with the creation of A-site cationic vacancies as well as oxygen vacancies. Such a scenario results in significant decreasing in grain boundaries resistivity. The activation energy of grain boundaries conductivity is significantly reduced in the case of lanthanum admixture.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 1; 207-214
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
THz spectroscopy of explosive-related simulants and oxidizers
Autorzy:
Trzciński, T.
Palka, N.
Szustakowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/200109.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
THz spectroscopy
explosive-related simulants
Opis:
In this paper we report on measurement of spectra of commonly applied explosives, some materials which can be used for manufacture of explosive and THz simulants of explosives in transmission mode. Substances were prepared as pellets, and the measurements were performed using the Time Domain Spectroscopy system in the range 0.1–3.0 THz.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 445-447
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Towards miniaturized sensors for determination of exchangeable potassium in soil samples
Autorzy:
Grygolowicz-Pawlak, E.
Plachecka, K.
Wolanin, B.
Malinowska, E.
Powiązania:
https://bibliotekanauki.pl/articles/25360.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
soil analysis
measurement
soil
inductively coupled plasma-mass spectroscopy
atomic absorption spectroscopy
miniaturization
potentiometric electrode
standard method
nutrient level
flame emission spectroscopy
Źródło:
International Agrophysics; 2006, 20, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopic study of a bis(imidazole) (octaethylporphyrinato)iron(III) complex
Autorzy:
Rutkowska, I.
Dziliński, K.
Kaczmarzyk, T.
Stanek, J.
Powiązania:
https://bibliotekanauki.pl/articles/146898.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
electron paramagnetic resonance (EPR) spectroscopy
Mössbauer spectroscopy
low-spin iron porphyrin
imidazole axial ligands
Opis:
Low-spin ferric octaethylporphyrinatoiron complex with two imidazole axial ligands [Fe(III)(OEP)(Im)2]+ has been investigated by electron paramagnetic resonance (EPR) and Mössbauer spectroscopies. It was found that the ground spin state corresponds to the electron configuration (dxy)2 (dxz, dyz)3 and planes of the imidazole axial ligands have a parallel mutual orientation. Ethyl groups bonded to pyrrole rings, as peripheral substituents, effect on the ground electron spin state of the complex studied and the relative orientation of the the imidazole axial ligands in a similar way like the phenyl substituents bonded to meso-carbon atoms of the porphyrin macrocycle. The temperature dependence of the Mössbauer spectra is discussed in terms of magnetic relaxation processes.
Źródło:
Nukleonika; 2013, 58, 3; 419-423
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mass spectrometry approaches in proteomic and metabolomic studies
Autorzy:
Rodziewicz, P.
Swarcewicz, B.
Chmielewska, K.
Powiązania:
https://bibliotekanauki.pl/articles/80650.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
proteomics
metabolomics
genomic DNA
nuclear magnetic resonance
mass spectrometry
Fourier transform infrared spectroscopy
Raman spectroscopy
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2014, 95, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Condense-Phase BBCEAS Measurements at UV Wavelength
Autorzy:
Nouna, Noora Sh. Oraha Qas
Powiązania:
https://bibliotekanauki.pl/articles/1190113.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Broadband cavity enhanced absorption spectroscopy
BBCEAS
Liquids
Absorption spectroscopy
Ultraviolet light emitted diode
UV-LED
Opis:
Broadband cavity enhanced absorption spectroscopy (BBCEAS) has been used to make measurements on liquid phase species using a UV LED and an optical cavity formed by R ≥ 0.99 ultra violet mirror set. The detector is an Andor CCD spectrograph. Measurements is made on a number of dyes dissolved in water and placed in a 1 cm quartz cuvette at zero degrees angle of incidence between the cavity mirrors. The most sensitive measurements are made with the R ≥ 0.99 mirror set on congo red at 397 nm which produced an αmin(t) value of 2.1 × 10-6 cm-1 Hz-1/2 and a LOD of 0.19 nM.
Źródło:
World Scientific News; 2016, 35; 17-29
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Humic acids from an Arctic fjord, Krossfjorden, Spitsbergen
Autorzy:
Shaji, Aswathy
Gopinath, Anu
Krishnan, Anoop
Prabhakaran, Sabu
Powiązania:
https://bibliotekanauki.pl/articles/16538467.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Arctic
Svalbard
sediment
organic matter
spectroscopy
Opis:
Humic substances are ubiquitous materials found in terrestrial and aquatic ecosystems. Humic acids, a diagenetic product can interact with various components present in aquatic sediments. The present research is on the evaluation of sedimentary humic acids from the Krossfjorden glacial fjord situated within the Svalbard archipelago. The results of this study are needed to understand the structural characteristics of humic acids isolated from the fjord. Surface sediment samples were collected from four stations throughout the fjord during a summer period in 2018. Various spectroscopic techniques such as UV-visible, Fourier-transform infrared spectroscopy (FTIR), and Nuclear magnetic resonance spectroscopy (NMR) were applied for studying the humic acids. The elemental composition as well as the presence of tannin and lignin were also analyzed. The results of this study revealed the variation in the structure of humic acids from aliphatic to aromatic from the outer to the inner region of the fjord. This change in humic acids was well supported by the FTIR and NMR results with differences in the spectrums.
Źródło:
Polish Polar Research; 2022, 43, 4; 311-324
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected nonapeptides in terahertz light
Autorzy:
Fuglewicz, B.
Pliński, E. F.
Jarząb, P. P.
Plińska, S.
Cebrat, M.
Nowak, K.
Augustyn, L.
Walczakowski, M. J.
Mikulics, M.
Pałka, N.
Szustakowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/173420.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
terahertz spectroscopy
peptides
oxytocin
vasopressin
derivatives
Opis:
Eight synthetic histidine analogues of oxytocin and vasopressin are subject of investigations. The spectra of the peptides have been investigated in the terahertz band. The results are obtained in the terahertz time-domain spectroscopy arrangement.
Źródło:
Optica Applicata; 2014, 44, 1; 159-171
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Linear and nonlinear optical spectroscopy of CdS nanoparticles in Nafion membranes
Autorzy:
Bourdin, E.
Henari, F.Z.
Blau, W.J.
Kelly, J.M.
Powiązania:
https://bibliotekanauki.pl/articles/308719.pdf
Data publikacji:
2000
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
optical spectroscopy
Nafion membranes
CdS nanoparticles
Opis:
CdS nanoparticles embedded in Nafion membranes were studied by a variety of optical spectroscopic methods. Quantum confinement was achieved (particle mean diameter of 40 A) and the growth was found to follow a linear temporal kinetic law. Discrete energy levels were observable, even at room temperature. They could be attributed to light hole and heavy hole IS and 2S transitions. The experimental results are in good agreement with theoretical calculations of light hole and heavy hole masses in the cases of cubic CdS. An enhancement of the nonlinear susceptibility chi(3) at the quantized exciton energy levels was observed. The clusters were found to be photo-unstable, with a diffusion-limited growth rate due to Ostwald ripening.
Źródło:
Journal of Telecommunications and Information Technology; 2000, 1-2; 29-36
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected chemical substances detection using dual-band thermal imaging camera with microbolometer infrared focal plane array detectors
Autorzy:
Ligienza, A.
Bieszczad, G.
Gogler, S.
Powiązania:
https://bibliotekanauki.pl/articles/114186.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
infrared spectroscopy
microbolometer FPA
image processing
Opis:
Main notion of this paper is presenting the possibility of applying microbolometer FPAs in detection and visualization of far infrared sub-bands (LWIR 8-12 µm), as a cheaper alternative to cooled detectors. Specifically designed and built device consists of infrared optics, custom made beamsplitter with desired spectral characteristic, two microbolometer infrared FPA detectors, data acquisition and processing software for substance detection.
Źródło:
Measurement Automation Monitoring; 2017, 63, 2; 69-72
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Engine fuel characterisation through ultraviolet absorption spectra
Autorzy:
Baszanowska, E.
Otremba, Z.
Powiązania:
https://bibliotekanauki.pl/articles/245537.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
fuel
spectroscopy
absorptivity
diesel engine system
Opis:
In the article, light absorption properties of the fuel oil are considered with a view to create basis for establish optical indicator of the type and quality of this kind of crude oil derivative, in this case the Diesel fuel. The organic solvent – n-hexane – was chosen as a solvent to prepare samples of dilutions of Diesel fuel in several oil concentration. Spectrophotometer Aqualog Horiba were applied to record the absorbance spectra in the ultraviolet and visual range of the light (from 240 to 600 nm) for each previously prepared samples. Obtained results allow concluding that the changes of absorbance occur primarily in the wavelength range from 240 nm to 355 nm. Moreover, the absorbance spectra are characterized by the characteristic sharp peak located at 270 nm for excitation wavelength. Spectra of absorbance were converted to spectra of absorption coefficient based on Lambert-Beer law. Due to the independence the absorption coefficient from the fuel concentration, this parameter could be used as a potential indicator to access composition and quality Diesel fuel used in the diesel engine system. Therefore, preliminary tests allow concluding that absorption coefficient for selected wavelength located at 270 nm could be a sensitive indicator for quick access to fuel quality.
Źródło:
Journal of KONES; 2017, 24, 3; 15-19
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-50 z 743

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