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Wyświetlanie 1-12 z 12
Tytuł:
Applications of the Cracow X-Ray Microprobe in Tomography
Autorzy:
Bielecki, J.
Bożek, S.
Lekki, J.
Stachura, Z.
Kwiatek, W.
Powiązania:
https://bibliotekanauki.pl/articles/1809463.pdf
Data publikacji:
2009-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.59.-e
87.57.Q-
Opis:
A nuclear microprobe at the IFJ PAN in Cracow has found numerous applications in different fields of research, mostly in biophysics, medical sciences, geology, and material research. In order to extend the research possibilities, a new X-ray microprobe was constructed. This new microprobe consists of three experimental lines dedicated to: (i) X-ray irradiation of biological specimens, (ii) elemental analysis of samples by micro X-ray fluorescence or total reflection X-ray fluorescence methods and (iii) computer microtomography. In this paper the computer microtomography line was described. The line consists of an open type Hamamatsu L9191 X-ray tube with microfocusing to about 2 μm, a high resolution X-ray sensitive CCD camera, and a precise goniometer composed of six piezoelectric motors. Depending on the required X-ray energy, the Hamamatsu tube is used with Ti, Mo, Ag, or W targets. A small focus size and short focus-to-object distance enable to obtain images of samples with a magnification of more than 1000× and resolution of the order of 2 μm. The computer microtomography measurements are carried out using home developed codes combined with commercial software. Details of the microprobe construction and preliminary results of the computer microtomography experiments are presented.
Źródło:
Acta Physica Polonica A; 2009, 115, 2; 537-541
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of External Radiation Dose Changes in Some X-ray Applications
Autorzy:
Coşkun, A.
Mavi, B.
Powiązania:
https://bibliotekanauki.pl/articles/1402421.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.57.Q-
87.55.N-
87.53.-j
Opis:
Ionizing radiation is commonly used in diagnostic and therapeutic applications in medicine. Therefore, both staff and patients are exposed to the biological influence of radiation. Biological effects and damages are proportional to the irradiation.In this study the radiation dose to human in the patient room and the technician room at computed tomography and X-ray units were measured and compared for different situations.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-365-B-366
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recovering Images from PET Camera
Autorzy:
Üstündağ, D.
Powiązania:
https://bibliotekanauki.pl/articles/1031634.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.30.ZZ
02.50.-R
29.30.KV
87.57.Q-
87.57.U
Opis:
We study here one of the imaging techniques, used in nuclear medicine, called positron emission tomographic imaging, that provides information about many biological processes that are essential to the functioning of the organ, being visualized. Our emphasis is given to the application of the maximum entropy image reconstruction method called "Cambridge MaxEnt Package" for recovering images of the human brain from data obtained by positron emission tomographic camera.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 963-966
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Changing Face of Economics? Ethical Issues in Contemporary Economic Schools as a Consequence of Changes in the Concept of Human Nature
Autorzy:
Horodecka, Anna
Powiązania:
https://bibliotekanauki.pl/articles/652854.pdf
Data publikacji:
2015-12
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
business ethics
heterodox economic schools
economic anthropology
concept of human nature
B25
B50
B52
B54
B59
Q57
Z13
Opis:
The last financial crisis combined with some recent social trends (like growing inequality or environmental problems) inspired many contemporary economists to the re-evaluation of actual economic knowledge in the search for solutions to these problems. Modern economic schools (especially heterodox ones) stress the meaning of ethical issues in economics more often. The thesis of the paper is that this revival of the ethical face of present economics depends very strongly on the changing assumptions of human nature within economics and other disciplines which work alongside economics, such as social psychology or business ethics, for instance. In order to prove the thesis, the paper provides an evaluation of current economic schools, especially within the heterodoxy, in search of their ethical aspects, and presents them as a result of the changing assumptions about human beings within those schools. This ethical dimension of human beings manifests itself in different ways, which can be perceived as a result of it being based on different ethical schools and different psychological and philosophical assumptions about human nature. Therefore, the paper also considers the current developments of the view on human beings in contemporary schools of economic ethics.
Źródło:
Annales. Etyka w Życiu Gospodarczym; 2015, 18, 4
1899-2226
2353-4869
Pojawia się w:
Annales. Etyka w Życiu Gospodarczym
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Terahertz Emission from Narrow Gap Semiconductors Photoexcited by Femtosecond Laser Pulses
Autorzy:
Adomavičius, R.
Urbanowicz, A.
Molis, G.
Krotkus, A.
Powiązania:
https://bibliotekanauki.pl/articles/2041649.pdf
Data publikacji:
2005-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Re
07.57.Hm
78.47.+p
72.30.+q
Opis:
Large increase in the emitted terahertz power was observed for p-InAs samples with the p-doping levels of approximately 10$\text{}^{16}$-10$\text{}^{17}$ cm$\text{}^{-3}$. This increase was explained by a large surface depletion layer and an electric-field-induced optical rectification effect in the layer. Terahertz fields radiated by the samples of all three investigated Cd$\text{}_{x}$Hg$\text{}_{1-x}$Te layers was of the same order of magnitude. No azimuthal angle dependence of the radiated signal was detected, which evidences that linear current surge effect is dominating over nonlinear optical rectification. Azimuthal angle and magnetic fields emission witness that it is caused by linear photo-Dember type processes.
Źródło:
Acta Physica Polonica A; 2005, 107, 1; 132-136
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extension of the p-Spectrum Method to the Higher Frequencies
Autorzy:
Pałka, N.
Powiązania:
https://bibliotekanauki.pl/articles/1399394.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.57.Ty
78.20.Ci
78.40.-q
78.47.jg
Opis:
The p-spectrum method is a time domain spectroscopy-based technique for reflection analysis of materials (including explosives) that takes into account only part of the reflected signal, which is next analyzed via the Fourier transform. The method is limited to the frequencies of about 1.8 THz due to the pulse properties of our time domain spectroscopy setup. In this paper we theoretically prove that application of a shorter pulse can increase this frequency range up to 2.2 THz, that enables analysis of penthrite and octogen, two important explosives.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 534-537
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transmission Spectra of Materials in the Terahertz Range Measured by a Hot Electron Bolometer-Based System
Autorzy:
Pałka, N.
Walczakowski, M.
Zagrajek, P.
Czerwiński, A.
Sypek, M.
Szustakowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1399395.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.57.Ty
78.20.Ci
78.40.-q
78.47.jg
Opis:
This paper presents an optical system for transmission spectral measurements in the terahertz range. The source of radiation is a tunable solid-state laser, which generates a narrow-band nanosecond pulses in the range 0.67-2.68 THz and based on optical parametric oscillator phenomenon. The signal is detected with a fast and sensitive hot electron bolometer. Principle of generation and detection of pulses as well as methodology of measuring spectral characteristics are presented. We compared the results obtained with the free-space setup, which is based on the optical parametric oscillator and hot electron bolometer, with a purged time domain spectroscopy system in the range of 0.7-2.2 THz.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 538-541
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust Algorithm for Heart Rate (HR) Detection and Heart Rate Variability (HRV) Estimation
Autorzy:
Piotrowski, Z.
Różanowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/1537546.pdf
Data publikacji:
2010-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.85.Ng
87.19.Le
84.37.+q
87.57.C-
Opis:
We present algorithm for Heart Rate detection based on Short-Term Autocorrelation Center Clipping method. This algorithm is dedicated for biological signal detection, electrocardiogram, in noisy environment with lot of artifacts. Using this algorithm is also possible detect the R pointers in the PQRST complex of the ECG signal. In this paper the new implementation of the heart rate variability estimation is also presented. HRV module is based on parametric and non-parametric methods of the power spectral density computation.
Źródło:
Acta Physica Polonica A; 2010, 118, 1; 131-135
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hyperspectral Imaging Infrared Sensor Used for Enviromental Monitoring
Autorzy:
Kastek, M.
Piatkowski, T.
Zyczkowski, M.
Chamberland, M.
Lagueux, P.
Farley, V.
Powiązania:
https://bibliotekanauki.pl/articles/1399366.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.57.Ty
78.20.Ci
78.40.-q
78.47.jg
Opis:
This paper presents detection, identification and quantification of gases using an infrared imaging Fourier-transform spectrometer. The company Telops has developed an imaging Fourier-transform spectrometer instrument, Hyper-Cam sensor, which is offered as short or long wave infrared sensor. The principle of operation of the spectrometer and the methodology for gases detection, identification and quantification has been shown in the paper, as well as theoretical evaluation of gases detection possibility. The variation of a signal reaching the imaging Fourier-transform spectrometer caused by the presence of a gas has been calculated and compared with the reference signal obtained without the presence of a gas in the imaging Fourier-transform spectrometer field of view. Some result of the detection of various types of gases has been also included in the paper.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 463-467
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Terahertz Emission from the Surfaces of InAs and Other Narrow-Gap Semiconductors
Autorzy:
Adomavičius, R.
Krotkus, A.
Molis, G.
Urbanowicz, A.
Malevich, V.
Powiązania:
https://bibliotekanauki.pl/articles/1813200.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Re
07.57.Hm
78.47.-p
72.30.+q
Opis:
THz pulses were used to investigate carrier dynamics in narrow-gap semiconductors. The measurement of the optically induced THz pulse absorption transients provided important insights into electron energy relaxation in the conduction band. In the second set of experiments, THz generation from the surfaces of various semiconductors was studied and compared. It was found that the most efficient THz emitters are semiconductors with a narrow band gap, large intervalley separation in the conduction band, and low nonparabolicity of the main valley.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 859-862
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complex THz Reflectance Spectra of Hexogen Measured for Various Surfaces
Autorzy:
Palka, N.
Powiązania:
https://bibliotekanauki.pl/articles/1418028.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.57.Ty
78.20.Ci
78.40.Pg
78.40.-q
78.47.jg
Opis:
In this paper, we report on measurements of reflection spectra of hexogen (RDX) by means of time domain spectroscopy. We analyzed both phase and amplitude of reflected impulses for three cases: detuning, samples with rough surfaces and samples with curved surfaces. It can be concluded that both spectral characteristics can be applied for identification of explosives in the reflection configuration.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 854-857
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of $H_2:CH_4$ Plasma Composition by Means of Spatially Resolved Optical Spectroscopy
Autorzy:
Bogdanowicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/1811532.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.60.-q
42.81.-i
07.57.-c
42.15.Eq
32.30.-r
52.50.Sw
81.05.Uw
Opis:
The system based on spatially resolved optical emission spectroscopy dedicated for in situ diagnostics of plasma assisted CVD processes is presented in this paper. Measurement system coupled with chemical vapour deposition chamber by dedicated fiber-optic paths enables investigation of spatial distribution of species densities ($H_x$, $H^+$, CH, $CH^+$) during chemical vapour deposition process. Experiments were performed for a various gas inlet configuration at range of microwave power up to 800 W. Spatially resolved optical spectroscopy results showed that inlet configuration based on injecting hydrogen in ECR region and methane in substrate area is the most efficient for $H^+$ and $CH_{3}^{+}$ excitation. The designed prototype of the spatially resolved optical spectroscopy system enables the high-sensitivity measurements of concentration of the species in the microwave plasma and can be used for optimisation of diamond-like carbon synthesis.
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-33-A-38
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-12 z 12

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