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Wyszukujesz frazę "Herman, J." wg kryterium: Autor


Wyświetlanie 1-8 z 8
Tytuł:
Application of Modified Interference Wedge Method in Measurements of Indices of Refraction and Birefringence of Nematic Liquid Crystals
Autorzy:
Kowiorski, K.
Kędzierski, J.
Raszewski, Z.
Kojdecki, M.
Herman, J.
Miszczyk, E.
Piecek, W.
Powiązania:
https://bibliotekanauki.pl/articles/1399015.pdf
Data publikacji:
2013-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.15.+e
Opis:
Wedge cell filled with a homogeneously oriented nematic liquid crystal was exploited as an interference wedge to measuring indices of refraction. Interference fringes from the wedge were observed in polarised light in reflection or transmission mode of a polarisation microscope to determining ordinary and extraordinary indices of refraction or birefringence (i.e. anisotropy of both indices). The interference fringes close to wedge apex were uniform and could be well described in two-beam interference approximation. The refractive indices were computed with using simple formulae involving only distances between subsequent fringes in a cell filled with the liquid crystal and an empty reference cell. Several new highly-birefringent nematic mixtures produced in the Military University of Technology were investigated. The 6CHBT nematic was used as the reference material.
Źródło:
Acta Physica Polonica A; 2013, 124, 6; 946-948
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Preliminary Analysis of Wireless Link for Bats Signals Acquisition System
Autorzy:
Herman, K.
Debski, M.
Furmankiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1493212.pdf
Data publikacji:
2011-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.63.Cb
87.19.U-
07.05.Tp
Opis:
The scope of an article that is presented below covers a preliminary analysis of a wireless link of ultrasound signal transmission in commercial radio frequency band (UHF). The radio link is used to transmit short ultrasound bat-like biosonar signals. Because of complicated structure properties and of transmitted signals the various methods of wireless transmission are shown. The hardware implementation consists of micro-electro-mechanical system microphone, microphone preamplifier and FM transmitter. At the end of the radio link a standard FM receiver is used. Since we use frequency modulation an influence of the radio link on received signal parameters is presented. The analysis of results provides us a set of information that might be used in designing of large scale wireless sensor networks for bats behavior monitoring.
Źródło:
Acta Physica Polonica A; 2011, 120, 4; 635-638
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Digital Signal Processing Approach in Air Coupled Ultrasound Time Domain Beamforming
Autorzy:
Herman, K.
Gudra, T.
Furmankiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/177033.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
beamforming
air-coupled ultrasounds
DSP
digital signal processing
bat signals
direction of arrival
Opis:
The work presents the results of experimental study on the possibilities of determining the source of an ultrasonic signal in two-dimensional space (distance, horizontal angle). During the research the team used a self-constructed linear array of MEMS microphones. Knowledge in the field of sonar systems was utilized to analyse and design a location system based on a microphone array. Using the above mentioned transducers and broadband ultrasound sources allows a quantitative comparison of estimation of the location of an ultrasonic wave source with the use of broadband modulated signals (modelled on bats’ echolocation signals) to be performed. During the laboratory research the team used various signal processing algorithms, which made it possible to select an optimal processing strategy, where the sending signal is known.
Źródło:
Archives of Acoustics; 2014, 39, 1; 37-50
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth Processes of ZnTe Epilayers Deposited by MBE on GaAs(100) Vicinal Surfaces - Studies by Static and Dynamic RHEED
Autorzy:
Sadowski, J.
Dziuba, Z.
Herman, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/1932085.pdf
Data publikacji:
1995-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.14.Hg
81.15.Gh
Opis:
Static and dynamic reflection high energy electron diffraction (RHEED) has been applied for studying the initial growth processes of ZnTe crystallized by molecular beam epitaxy (MBE) on vicinal surfaces of GaAs(100) substrates. Atomically smooth ZnTe epilayers have been grown by MBE when in situ thermal desorption of the substrate protecting oxide layer was performed in the ultra high vacuum environment of the vacuum growth chamber just before the growth of ZnTe started. By gradual increasing of the substrate temperature of the crystallized ZnTe epilayers from 300°C to 420°C, when recording the RHEED intensity oscillations at these and eleven intermittent temperatures, it has been shown that the transition from the 2D-nucleation growth mechanism to the step-flow growth mechanism of ZnTe occurs at 410°C. Measuring periods of RHEED intensity oscillations recorded during the MBE growth processes it has been demonstrated that the growth rate of ZnTe at constant fluxes of the constituent elements decreases with increasing temperature from 0.37 ML/s at 300°C to 0.22 ML/s at 400°C.
Źródło:
Acta Physica Polonica A; 1995, 87, 1; 225-228
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial and interannual variations of seasonal sea surface temperature patterns in the Baltic Sea
Autorzy:
Bradtke, K.
Herman, A.
Urbanski, J.A.
Powiązania:
https://bibliotekanauki.pl/articles/48507.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
spatial variation
interannual variation
sea surface temperature
seasonality
global climate change
thermal season
annual cycle
transitional period
Baltic Sea
Opis:
On the basis of monthly averaged satellite data, this study examined how the annual cycle of the Baltic Sea surface temperature (SST) varied spatially and temporally during the period 1986–2005. We conclude that there are two main thermal seasons in the Baltic Sea separated only by short transitional periods – spring lasting about one month, and autumn lasting two months. Generally speaking, summer covers the part of the year from June to October with the highest monthly mean SST in August. Winter, with a minimum monthly mean SST in February in shallow waters or in March in deeper areas, lasts from December to April. As a result of climate changes over the Baltic Sea region, strong positive trends in SST occur in the summer months. In consequence, the period with extremely high sea surface water temperatures has become slightly longer in the central Baltic. In the last decade winter changes in SST display zero or even negative tendencies. The investigated period was characterized by an annual increase in mean temperatures of about 0.03–0.07◦C. However, the rates of monthly mean SST changes were sometimes more than three times as high.
Źródło:
Oceanologia; 2010, 52, 3; 345-362
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of chlorite in drinking water and related aspects of environment protection
Oznaczanie chloranów w wodach wodociągowych w aspekcie ochrony środowiska
Autorzy:
Herman, M.
Wieczorek, M.
Matuszek, M.
Tokarczyk, J.
Stafinski, M.
Koscielniak, P.
Powiązania:
https://bibliotekanauki.pl/articles/14957.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
chlorite
determination
drinking water
environment protection
flow analysis
spectrophotometry
water treatment
disinfection
ion chromatography
Opis:
One possible method of drinking water treatment is chlorine dioxide disinfection. This technology, however, requires reliable control of its byproducts, including chlorite ions., which pose a threat to human health. In this paper an original procedure for flow indirect determination of chlorite in drinking water was described. This method relies on oxidization of chlorite ions by iron(III) in acid environment measurement of the spectrophotometric signal for the phenanthroline/iron(II) complex. The determinations were carried out by flow analysis with the use of a dedicated set of flow instruments. The method was used for analysis of natural samples collected from various water intakes in Kraków. The new analytic approach was compared with the routinely applied ion chromatography method.
Jednym ze sposobów uzdatniania wody pitnej jest jej dezynfekcja tlenkiem chloru(IV). Ważnym zadaniem, jakie wiąże się jednak z tym procesem, jest wiarygodna kontrola zawartości produktów ubocznych w postaci jonów chloranowych(III), stanowiących duże zagrożenie dla zdrowia człowieka. W pracy opisano oryginalną procedurę pośredniego oznaczania chloranów(III) w wodach. Polega ona na wykorzystaniu reakcji chloranów(III) z jonami żelaza(II) w środowisku lekko kwaśnym i pomiarze spektrofotometrycznego sygnału dla jonów żelaza(II) w obecności 1,10-fenantroliny. Oznaczenia wykonywano techniką przepływową z użyciem dedykowanego zestawu instrumentalnego. Metodę zastosowano do analizy próbek pobranych z różnych ujęć wody pitnej w Krakowie. Dokonano porównania opracowanego podejścia analitycznego z rutynowo stosowaną metodą chromatografii jonowej.
Źródło:
Journal of Elementology; 2006, 11, 4
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Augmentative and Alternative Communication (AAC) for a patient with a nonfluent/agrammatic variant of PPA in the mutism stage
Autorzy:
Goral-Polrola, J.
Polrola, P.
Mirska, N.
Mirski, A.
Herman-Sucharska, I.
Pachalska, M.
Powiązania:
https://bibliotekanauki.pl/articles/50619.pdf
Data publikacji:
2016
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2016, 23, 1
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Poly(3,4- ethylenedioxypyrrole) – novel conducting polymer with biomedical applications
Autorzy:
Krukiewicz, K.
Gniazdowska, B.
Turczyn, R.
Jarosz, T.
Herman, A. P.
Boncel, S.
Zak, J. K.
Powiązania:
https://bibliotekanauki.pl/articles/284236.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
polymers
biomedical engineering
biomaterials
Źródło:
Engineering of Biomaterials; 2016, 19, 138; 79
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

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