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Wyświetlanie 1-15 z 401
Tytuł:
Effect of the Chemical Unhairing Process on Pulled Wool Characteristics
Autorzy:
Abdellaoui, Olfa
Harizi, Taoufik
Msahli, Slah
Powiązania:
https://bibliotekanauki.pl/articles/2171990.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
ATR-FTIR
red face Barbary sheep
sheep breed
chemical unhairing process
pulled wool
SEM
scanning electron microscopy
X-ray
Opis:
Textile research is being driven to find sustainable materials as an alternative to raw fibers. In fact, reusing fibrous waste, as a byproduct, is one of the most important environmental challenges that confront the world. This research focused on studying pulled wool fibers as a natural fiber to reduce environmental loading. There are large amounts of residual pulled wool fibers that can be recycled and valorised. Therefore, raw and pulled wool fibers were characterized and compared. Scanning Electron Micrographs (SEM) results show that on the pulled wool fiber, the surface became rougher and the scales appear affected and less dense. Based on the X-ray diffraction (XRD) results, the crystallinity of the pulled fiber decreased lightly. Attenuated Total Reflectance-Fourier Transform Infra Red (ATR-FTIR) spectroscopy analyzes presented some changes in chemical composition. A High-Performance Liquid Chromatography (HPLC) test showed an increase in the amount of cystic acids. The pulled wool fiber indicates that it might have damaged some crosslinks of macromolecular chains in the fiber. Thus, physical, chemical and mechanical properties are affected during the chemical unhairing process. This research purpose was to increase the potential for better value of pulled wool as it presents the natural fiber most used in several applications.
Źródło:
Fibres & Textiles in Eastern Europe; 2022, 3 (151); 70--78
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of abrasive grit size on roughness of sanded beech wood surface
Autorzy:
Adamcik, Lukas
Kminiak, Richard
Dudiak, Michał
Banski, Adrian
Powiązania:
https://bibliotekanauki.pl/articles/24072437.pdf
Data publikacji:
2023
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
surface roughness
belt sander
beech wood
Keyence VHX
digital microscopy
Opis:
The study assessed the changing of Ra, Rp, Rv and Rz roughness parameters of the sanded beech surface (Fagus sylvatica L.) as a function of different grit sizes and different measurement direction. The milled samples were ground with a belt sander BS-75 E-set from Festool with belt grit P60, P100 and P150. The sanding belts were Rubin 2 from Festool. Roughness was evaluated using a Keyence VHX-7000 digital microscope. The evaluation length of the roughness measurement was 12.5 mm (λc = 2.5 mm and λs = 8 mm). The R-parameters were measured in accordance with the latest standards ISO 21920 (2022) in the direction parallel to the grain, and in the direction perpendicular to the grain (profile). The paper proves the theoretical assumptions about the reduction of R-parameter values. The measurements showed that the sanded surface was less rough in the direction perpendicular to the grain at P150 sanding belt grit and in the grain direction at P100 grit.
W pracy oceniono zmianę parametrów chropowatości Ra, Rp, Rv i Rz szlifowanej powierzchni buka (Fagus sylvatica L.) w funkcji różnej wielkości ziarna i kierunku pomiaru. Zmielone próbki szlifowano szlifierką taśmową BS-75 E-set firmy Festool o ziarnistościach taśmowych P60, P100 i P150. Taśmy szlifierskie to Rubin 2 firmy Festool. Chropowatość oceniano przy użyciu mikroskopu cyfrowego Keyence VHX-7000. Długość ewaluacyjna pomiaru chropowatości wynosiła 12,5 mm (λc = 2,5 mm i λs = 8 mm). Parametry R zostały zmierzone zgodnie z najnowszymi normami ISO 21920 (2022) w kierunku równoległym do włókien oraz w kierunku prostopadłym do włókien (profil). Artykuł potwierdza teoretyczne założenia dotyczące redukcji wartości parametru R. Pomiary wykazały, że szlifowana powierzchnia była mniej chropowata w kierunku prostopadłym do włókien przy ziarnistości taśmy ściernej P150 oraz w kierunku włókien przy ziarnistości P100.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2023, 121; 51--60
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural Analysis of Concrete Using Cow Bone Ash for Alkali-Silica Reaction (ASR) Suppression
Autorzy:
Adanikin, Ariyo
Falade, Funsho
Olutaiwo, Adewale
Powiązania:
https://bibliotekanauki.pl/articles/106963.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
petrographic analysis
Scanning Electron Microscopy
Cow Bone Ash
Alkali-Silica Reaction
concrete pavement
Opis:
Concrete pavements are prone to microstructural changes and deterioration when exposed to Alkali-Silica Reaction (ASR). ASR results in strength reduction, cracking, spalling and other defects in the concrete if left unchecked. Supplementary Cementitious Materials (SCMs) such as Cow Bone Ash (CBA) however can be used to improve concrete performance, hence its use in this study. Concrete samples were prepared at replacement levels of 0%, 5%, 10%, 15%, 20% and 30% of cement with Cow Bone Ash. The concrete samples were then subjected to petrographic and Scanning Electron Microscopy (SEM) analysis. Petrographic examination shows that the minimal and least amount of ASR gels and micro cracking were observed at 15% CBA replacement of cement in the concrete samples. Scanning Electron Microscopy (SEM) analysis shows that changes in the elemental composition of the concrete samples is related to the effect of CBA which enhances adhesion in the concrete. SEM analysis show that, in general, the change in microstructure in the concrete was mainly due to the change in the arrangement of the C-H-S compounds. The microstructure analysis indicates that CBA in concrete influences the densification of the concrete at the transition zone, resulting in a much lower porosity. This results in the concrete having a tightly bound layer that repels ingress of water and thereby inhibiting cracks and gel formation as water is a contributing factor to the ASR in concrete.
Źródło:
Journal of Casting & Materials Engineering; 2020, 4, 2; 34-40
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation, characterization and optimization of cross-linked fructosyltransferase aggregates for the production of prebiotic fructooligosaccharides
Autorzy:
Ademakinwa, A.N.
Ayinla, Z.A.
Omitogun, O.G.
Agboola, F.K.
Powiązania:
https://bibliotekanauki.pl/articles/81247.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fructosyltransferase
Aureobasidium pullulans
fructooligosaccharide
prebiotic
statistical optimization
scanning electron microscopy
X-ray spectroscopy
Fourier transform infrared spectroscopy
biotransformation
chemometric analysis
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2018, 99, 4
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Nature of Tintinnid Loricae (Ciliophora: Spirotricha: Tintinnina): a Histochemical, Enzymatic, EDX, and High-resolution TEM Study
Autorzy:
Agatha, Sabine
Simon, Paul
Powiązania:
https://bibliotekanauki.pl/articles/763619.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Chemical composition, crystal lattice, EDX analysis, enzyme digestion, high-resolution transmission electron microscopy, histochemical methods, lorica, tintinnid
Opis:
Tintinnids (Ciliophora: Spirotricha: Tintinnina) are occasionally the dominant ciliates in the marine plankton. The tintinnid loricae are minute artworks fascinating scientists for more than 230 years, but their chemical composition remained unclear, viz., chitinous or proteinaceous substances were discussed. Since sedimenting loricae contribute to the flux of elements and organic compounds in the oceans, knowledge about their nature is necessary in assessing their ecological role. Previous techniques and new methods, e.g. enzymatic digestion and high-resolution transmission electron microscopy, are applied in the present study. A chitinous nature of the loricae is rejected by the Van-Wisselingh test and failure of chitinase digestion. Only proteins might show a resistance against strong hot bases (KOH at 160°C for ~ 40 min. in tintinnid loricae) similar to that of chitin. Actually, the presence of nitrogen in the EDX analyses and the digestion of at least some loricae by proteinase K strongly indicate a proteinaceous nature. Furthermore, the crystal lattice revealed by high-resolution TEM in Eutintinnus loricae is similar to the proteinaceous surface layer (S-layer) of archaea, and the striation recognizable in transverse sections of Eutintinnus loricae has a periodicity resembling that of the crystalline proteins in the extruded trichocysts of Paramecium and Frontonia. The proteolytic resistance of some loricae does not reject the idea of a proteinaceous nature, as proteins in S-layers of some archaea and in most naturally occurring prions show comparable reactions. The data from the present study and the literature indicate proteins in the loricae of thirteen genera. Differences in the proteolytic resistance and staining properties between genera and congeners are probably due to deviations in the protein composition and the additional substances, e.g. lipids, carbohydrates. At the present state of knowledge, correlations between lorica structure, wall texture, ultrastructure of the lorica forming granules, and the histochemical and enzymatic findings are not evident. Therefore, further studies are required to estimate the taxonomic significance of these features and the ecological role of sedimenting loricae.
Źródło:
Acta Protozoologica; 2012, 51, 1
1689-0027
Pojawia się w:
Acta Protozoologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluorescent in situ hybridization of mitochondrial DNA and RNA
Autorzy:
Alán, Lukáš
Zelenka, Jaroslav
Ježek, Jan
Dlasková, Andrea
Ježek, Petr
Powiązania:
https://bibliotekanauki.pl/articles/1040297.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
molecular beacon fluorescent hybridization probes
nucleoids of mitochondrial DNA
confocal microscopy
transcription and replication intermediates
mitochondrial DNA and RNA
Opis:
To reveal nucleic acid localization in mitochondria, we designed molecular beacon fluorescent probes against: i) the light strand complementary to ND5 mitochondrial DNA (mtDNA) gene (annealing also to corresponding mRNA); ii) displacement (D) loop 7S DNA (annealing also to parallel heavy strand mtDNA and corresponding light strand transcript); iii) the proximal D-loop heavy strand displaced by the light strand promoter minor RNA. Confocal microscopy demonstrated ND5 probe spreading (less for other probes) in mitochondrial reticulum tubules but upon RNase A treatment all probes contoured mtDNA nucleoid localization. DNase I spread the signal over mitochondrial tubules. Future applications are discussed.
Źródło:
Acta Biochimica Polonica; 2010, 57, 4; 403-408
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, spectroscopic and thermogravimetric interpretations of UO2(II), ZrO(II), Zr(IV), VO(II) and V(V) ciprofloxacin antibiotic drug complexes
Autorzy:
Albedair, Lamia A.
Powiązania:
https://bibliotekanauki.pl/articles/1849331.pdf
Data publikacji:
2021
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
ciprofloxacin
complexation
FTIR
Fourier transform infrared spectroscopy
diamagnetic
TEM
transmission electron microscopy
nanoscale
Opis:
New five ciprofloxacin (CIP) complexes of dioxouranium(II), oxozirconium(II), zirconium(IV), oxovanadium(II) and vanadium(IV) in the proportion 1:2 have been prepared using CIP as a drug chelate with UO2(NO3)2. 6H2O, ZrOCl2. 8H2O, ZrC4, VOSO4. xH2O and V2O5 respectively. The CIP complexes have been characterized based on the elemental analysis, molar conductance, magnetic, (FTIR & 1HNMR) spectral and thermal studies. The molar conductance studies of the synthesized complexes in DMSO solvent with concentration of 10–3 M indicate their non-electrolytic properties. At room temperature, the magnetic moment measurements revealed a diamagnetic behavior for all CIP prepared complexes. The different formulas of the new complexes can be represented as [UO2(CIP)2(NO3)2] (I), [VO(CIP)2(SO4)(H2O)] (II), [V2(O)(O2)2(CIP)2] (III), [Zr(O)(CIP)2(Cl)2] (IV), and [Zr(CIP)2(Cl)4] (V). The thermal analysis data of the complexes indicates the absence of coordinated water molecules except for vanadyl(II) complex (II). The CIP chelate is a uni-dentate ligand coordinated to the mentioned metal ion through terminal piperazinyl nitrogen. The transmission electron microscopy (TEM) investigation confirms the nano-structured form of the complexes.
Źródło:
Polish Journal of Chemical Technology; 2021, 23, 1; 45-52
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Transition in SrZnO Laser Pulse Deposited Alloy
Autorzy:
Albrithen, H. A.
Elnaggar, M.
Ozga, K.
Szota, M.
Alahmed, Z. A.
Alanazi, A. Q.
Alshahrani, H.
Alfaifi, E.
Djouadi, M. A.
Labis, J. P.
Powiązania:
https://bibliotekanauki.pl/articles/355190.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
oxide materials
solid state alloys
structural phase transition
X-ray diffraction
scanning electron microscopy
Opis:
We have discovered a structural transition for the SrZnO alloy films from a wurtzite to a rock-salt structure, leading to a reduction in the (112̲0)/(0001) surface energy ratio. The films were grown by pulsed laser deposition using different SrO ratios, x. We have revealed that growth at a higher temperature, 750°C, resulted in a sharp 0002 peak at a low SrO content (5%), whereas growth at a higher SrO content (10%) resulted in a non-crystalline film with minute crystallites with a (112̲0) orientation. Generally the crystallinity decreased as the SrO content increased. No results obtained for the crystalline films showed any orientation of significant peaks besides the peak attributed to the (0001) plane, suggesting epitaxial growth. Optical measurements showed difference in transmission widows of alloys with different SrO percentage, and this was correlated to SrO influence on growth mode as indicated by scanning electron imaging. The studied SrZnO films, with SrO/(SrO + ZnO) ≤ 0.25, were grown by pulsed laser deposition using different SrO ratios, x. The effects of temperature and oxygen pressure during growth on the films’ structural properties were investigated. XRD results indicate that the film crystallinity was improved as the temperature and O2 pressure increased up to 650°C and 0.5 Torr, respectively.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 211-216
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation and Study of CdS thin films at different concentration thiorea by chemical bath deposition (CBD) method
Autorzy:
Anwar, H. Ali
Jassem, Sarah A.
Powiązania:
https://bibliotekanauki.pl/articles/1193882.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Atomic Force Microscopy
CdS nanostructure
CdS thin films
UV-Vis
X-Ray Diffraction
XRD
chemical bath deposition
nanostructure
Opis:
CdS nanostructure are prepared by chemical bath deposition CBD method using different thiourea concentrations. The thiourea concentration effect for CdS nanostructure deposited on glasses substrate have been studied. CdS nanostructure give important analysis of X-ray diffraction (XRD), optical transmittance using (UV-Vis) spectroscopy, in addition to characterization of Atomic force microscopy (AFM) to analyze surface morphology of a film and to determine the grain size have proved a good agreement with experimental and theoretical results.
Źródło:
World Scientific News; 2015, 23; 73-89
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Atomic force microscopy studies of the adhesive properties of DPPC vesicles containing β-carotene
Autorzy:
Augustyńska, Dominika
Jemioła-Rzemińska, Małgorzata
Burda, Kvetoslava
Strzałka, Kazimierz
Powiązania:
https://bibliotekanauki.pl/articles/1039795.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
atomic force microscopy
dipalmitoylphosphatidylcholine
β-carotene
liposome adhesion
thermal transition
Opis:
A role of carotenoids as modulators of physical properties of model and biological membranes has been already postulated. However, there is a lack of information on the influence of these pigments on interactions between the lipids which form such membranes. This paper applies atomic force microscopy (AFM) in to study the effects of β-carotene on the adhesion properties of DPPC multilamellar liposomes. This allowed us to gain, for the first time, a direct insight into the interactions between the components in model systems on a molecular level. We observe that the adhesive forces in DPPC multilamellar liposomes containing 1mol% of β-carotene decrease exponentially with increasing temperature, and that at about 37°C they diminish. In the case of pure liposomes the decline in adhesion is of a different nature and the adhesive forces disappear at 34°C. The adhesive forces are about 5 times higher at 31°C in the presence of β-carotene than in its absence. However, measurements using differential scanning calorimetry (DSC) showed a shift of the lamellar-to-undulled-lamellar phase transition toward lower temperatures by about 0.8±0.2°C in a system containing β-carotene. The enthalpy changes (ΔH) of this transition are similar for both systems. For the main transition, gel-to-liquid crystalline, the peak is shifted by about 0.5±0.1°C, and ΔH decreases by about 30% in liposomes treated with β-carotene in comparison to pure liposomes. Our results suggest increased cooperation between liposome components in a system with enriched β-carotene, which cause a change in phase transition temperatures. Moreover, these interactions are very sensitive to temperature.
Źródło:
Acta Biochimica Polonica; 2012, 59, 1; 125-128
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection and molecular identification of Cryptosporidium species in laboratory rats (Rattus norvegicus) in Ibadan, Nigeria
Autorzy:
Ayinmode, Adekunle Bamidele
Ogbonna, Nkeiruka Fortunate
Widmer, Giovanni
Powiązania:
https://bibliotekanauki.pl/articles/972090.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
laboratory rat
microscopy
pcr
sequencing
Cryptosporidium species
Opis:
To study the occurrence of Cryptosporidium infection in laboratory rats (Rattus norvegicus) raised for experimental usage, 134 faecal samples were obtained from two rearing houses in Ibadan and examined for the presence of Cryptosporidium oocyst using the modified acid fast staining technique. Cryptosporidium species in 2 samples positive for microscopy were further characterized by a nested polymerase chain reaction (PCR) amplifying the 18S rRNA gene. Two of 134 samples were positive for the Cryptosporidium oocysts. Sequencing of the small-subunit rRNA amplicons identified the species in the two PCR positive samples as Cryptosporidium andersoni and Cryptosporidium rat genotype. These findings showed that laboratory rat is a potential reservoir for diverse Cryptosporidium species and suggests that laboratory rats should be screened for Cryptosporidium infection prior to experiments, especially where pathogen free animals are not available. This the first report to identify Cryptosporidium species infecting laboratory rats in Nigeria.
Źródło:
Annals of Parasitology; 2017, 63, 2; 105-109
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultrasonic-assisted synthesis of reactive carboxymethyl cellulose stabilized nano zero-valent iron and its application for removal of Cr6+ and Cu2+ ions
Autorzy:
Ayob, A.
Santiagoo, R.
Amneera, W. A.
Ismail, N.
Abdullah, A. Z.
Powiązania:
https://bibliotekanauki.pl/articles/207403.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
high resolution transmission
electron microscopy
light scattering
transmission electron microscopy X ray diffraction
zero-valent iron
wysoka rozdzielczość transmisyjna
mikroskopia elektronowa
dyfrakcja rentgenowska
żelazo
Opis:
Carboxymethyl cellulose (CMC) was used in the chemical reduction using sodium borohydride to yield dispersive nano zero-valent iron (nZVI) particles as reactive and stable adsorbents. CMC- -stabilized nZVI particles were characterized via UV-visible light spectroscopy, X-ray diffraction, dynamic light scattering, transmission electron microscopy, and specific surface area assisted using a probe ultrasonication dispersing tool at 50% amplitude power. High catalytic reactivity obtained in pseudo-first order reaction for Cr6+ (rate constant K1 = 0.0311 min–1) and pseudo-second order for Cu2+ (rate constant K2 = 0.0946 g·mg–1·min–1) indicated that colloidal stability of nZVI particles can be achieved with a stabilizer for the removal of toxic contaminants.
Źródło:
Environment Protection Engineering; 2016, 42, 2; 55-79
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A measurement system for nonlinear surface spectroscopy with an atomic force microscope during corrosion process monitoring
System pomiarowy do nieliniowej spektroskopii powierzchni mikroskopem sił atomowych podczas monitorowania procesów korozji
Autorzy:
Babicz, S.
Zieliński, A.
Smulko, J.
Darowicki, K.
Powiązania:
https://bibliotekanauki.pl/articles/153459.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
corrosion
atomic force microscopy (AFM)
synchronous detection
nonlinearity
korozja
mikroskop sił atomowych
detekcja synchroniczna
nieliniowości
Opis:
In addition to traditional imaging of the surface, atomic force microscopy (AFM) enables wide variety of additional measurements. One of them is higher harmonic imaging. In the tapping mode the nonlinear contact between a tip and specimen results in higher frequency vibrations. More information available from the higher harmonics analysis proves to be helpful for more detailed imaging. Such visualization is especially useful for heterogeneous surfaces which are studied to understand corrosion mechanisms. In this paper the measurement system for nonlinear surface spectroscopy by AFM for corrosion processes monitoring is presented.
Oprócz tradycyjnego zastosowania, mikroskop sił atomowych (ang. Atomic Force Microscope, AFM) [1] (rys. 1) umożliwia wiele dodatkowych pomiarów, wśród których wyróżnić można obrazowanie powierzchni próbki wyższymi harmonicznymi [6-13]. W trybie półkontaktowym [2-4] w odpowiedzi mikrobelki zauważane są wyższe harmoniczne będące wynikiem oddziaływań nieliniowych [2-6]. Wykorzystanie wzmacniacza fazoczułego (ang.: lock-in amplifier) umożliwia obrazowanie topografii badanej próbki [12, 13] nawet do dwudziestej harmonicznej. Otrzymywane obrazy umożliwiają wyostrzenie elementów niewidocznych podczas tradycyjnego skanowania. Ma to związek z wyostrzoną czułością wyższych harmonicznych na struktury topograficzne. Takie obrazowanie jest szczególnie przydatne do badań próbek niejednorodnych [12], gdy łatwo wyróżnić przez obserwację poziom niektórych harmonicznych [6]. Oprócz wyraźnych zmian przy przejściach między różnymi substancjami, pomiary w cieczach wykazują się zwiększoną wrażliwością na lokalne różnice w elastyczności i interakcji geometrii [10]. Przedstawiono system do obrazowania powierzchni za pomocą wyższych harmonicznych w pomiarach ECAFM (ang. Electrochemical Atomic Force Microscopy, ECAFM, rys. 2). Prezentowane rozwiązanie (rys. 3, rys. 4) umożliwia jednoczesną rejestrację obrazów do szóstej harmonicznej podczas monitorowania procesów korozji (rys. 5, 6). Proponowany system pozwala na uzyskiwanie dodatkowych informacji o zjawiskach korozji zachodzących na skanowanych powierzchniach. Taka metoda stanowi uzupełnienie istniejących metod analizy powierzchni korozyjnych [14-16].
Źródło:
Pomiary Automatyka Kontrola; 2013, R. 59, nr 4, 4; 287-291
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancing capabilities of Atomic Force Microscopy by tip motion harmonics analysis
Autorzy:
Babicz, S.
Smulko, J.
Zieliński, A.
Powiązania:
https://bibliotekanauki.pl/articles/199918.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
atomic force microscopy (AFM)
harmonics
van der Waals forces
Opis:
Motion of a tip used in an atomic force microscope can be described by the Lennard-Jones potential, approximated by the van der Waals force in a long-range interaction. Here we present a general framework of approximation of the tip motion by adding three terms of Taylor series what results in non-zero harmonics in an output signal. We have worked out a measurement system which allows recording of an excitation tip signal and its non-linear response. The first studies of spectrum showed that presence of the second and the third harmonics in cantilever vibrations may be observed and used as a new method of the investigated samples characterization.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 535-539
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase Object Observation System Based on Diffraction Phase Microscopy
Autorzy:
Babicz, S.
Stawarz-Graczyk, B.
Wierzba, P.
Powiązania:
https://bibliotekanauki.pl/articles/221523.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
diffraction phase microscopy
DPM
phase objects
Opis:
In the paper authors present a special measurement system for observing phase objects. The diffraction phas microscopy makes it possible to measure the dimensions of a tested object with a nanometre resolution. To meet this requirement, it is proposed to apply a spatial transform. The proposed setup can be based either on a two lenses system (called 4f) or a Wollaston prism. Both solutions with all construction aspects are described in the paper. To make a full analysis of the object shape the authors developed an accurate image processing algorithm, also presented in the paper.
Źródło:
Metrology and Measurement Systems; 2018, 25, 1; 213-221
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 401

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