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Tytuł:
Ultrasonic flow measurement with high resolution
Autorzy:
Grzelak, S.
Czoków, J.
Kowalski, M.
Zieliński, M.
Powiązania:
https://bibliotekanauki.pl/articles/221448.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ultrasonic flowmeter
time-to-digital converter
programmable logic device
time measurement
Opis:
The ultrasonic flowmeter which is described in this paper, measures the transit of time of an ultrasonic pulse. This device consists of two ultrasonic transducers and a high resolution time interval measurement module. An ultrasonic transducer emits a characteristic wave packet (transmit mode). When the transducer is in receive mode, a characteristic wave packet is formed and it is connected to the time interval measurement module inputs. The time interval measurement module allows registration of transit time differences of a few pulses in the packet. In practice, during a single measuring cycle a few time-stamps are registered. Moreover, the measurement process is also synchronous and, by applying the statistics, the time interval measurement uncertainty improves even in a single measurement. In this article, besides a detailed discussion on the principle of operation of the ultrasonic flowmeter implemented in the FPGA structure, also the test results are presented and discussed.
Źródło:
Metrology and Measurement Systems; 2014, 21, 2; 305-316
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High resolution multi-beam side looking sonar
Autorzy:
Elminowicz, A,
Zajączkowski, L.
Powiązania:
https://bibliotekanauki.pl/articles/332745.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
The conventional side–scan sonars does not ensure sufficient angular and range resolution to detect very small objects with small target strength. Decrease of beam width leads to the increase of angular resolution but requires the decrease of towing speed what means reduction of searched area. Other method of the angular resolution increased is designing multi–beam sonar or sonar with synthetic aperture. The paper presents a design of effective multi–beam side looking sonars with a large angular and range resolution operates with 100 kHz, 200 kHz, 400 kHz and 600 kHz. The sonar, described in the paper, operates with 200 kHz frequency; LFM modulation – 20 kHz and 40 kHz band; array provides 32 elements with d/ë spacing what ensure a shaping of 5 or 9 beams with 0,40° width. The range of sonar is from 250 m to 300 m, the level of side lobes are smaller than -20 dB and level of grating lobes for 5 beams are smaller than -30 dB. The principle of sonar performance and wideband effective processing are presented. Effectiveness of processing depends on beams number and decrease of beams number, together with the range increased, leads to increase of processing effectiveness.
Źródło:
Hydroacoustics; 2005, 8; 37-46
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of very high resolution satellite imagery
Autorzy:
Jacobsen, K.
Powiązania:
https://bibliotekanauki.pl/articles/130521.pdf
Data publikacji:
2004
Wydawca:
Stowarzyszenie Geodetów Polskich
Tematy:
zdjęcia satelitarne
satelita Landsat
rozdzielczość zdjęć
satellite imagery
Landsat satelite
resolution photos
Źródło:
Archiwum Fotogrametrii, Kartografii i Teledetekcji; 2004, 14; 1-12
2083-2214
2391-9477
Pojawia się w:
Archiwum Fotogrametrii, Kartografii i Teledetekcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Resolution X-ray Reciprocal Space Mapping
Autorzy:
Bauer, G.
Li, J. H.
Holy, V.
Powiązania:
https://bibliotekanauki.pl/articles/1943985.pdf
Data publikacji:
1996-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.-i
68.55.-a
61.72.Lk
Opis:
A survey will be given on recent advances in the investigation of semiconductor epilayers, heterostructures and superlattices using reciprocal space mapping techniques based on triple-axis diffractometry. It is shown that X-ray reciprocal space mapping yields quantitative information on strain, strain relaxation, as well as composition in such structures. These data are obtained from analyses of the isointensity contours of scattered X-ray intensity around reciprocal lattice points. Further analysis of the diffuse scattering yields also information on defect distribution in the epilayers.
Źródło:
Acta Physica Polonica A; 1996, 89, 2; 115-127
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Resolution Spectroscopy of Cold, Trapped Atoms
Autorzy:
Brzozowski, T.
Brzozowska, M.
Zachorowski, J.
Gawlik, W.
Powiązania:
https://bibliotekanauki.pl/articles/1814200.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.Pj
42.50.Vk
42.65.-k
Opis:
Pump-probe spectroscopy of cold, trapped atoms is discussed with particular attention to mechanisms specific for cold atoms and potential diagnostics applications. The discussion is illustrated with experimental results obtained with $\text{}^{85}Rb$ atoms trapped in a magneto-optical trap. Most important applications are non-destructive, real-time velocimetry (thermometry) and analysis of optical lattice dynamics.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 783-790
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Resolution Noise Radar without Fast ADC
Autorzy:
Lukin, K. A.
Vyplavin, P. L.
Zemlyaniy, O. V.
Palamarchuk, V. P.
Lukin, S. K.
Powiązania:
https://bibliotekanauki.pl/articles/227347.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
noise waveform
stepped frequency
stepped delay
Opis:
Conventional digital signal processing scheme in noise radars has certain limitations related to combination of high resolution and high dynamic range. The bandwidth of radar signal defines range resolution of any radar: the wider the spectrum the better the resolution. In noise radar with conventional processing the sounding and reference signals are to be digitized at intermediate frequency band and to be processed digitally. The power spectrum bandwidth of noise signal which can be digitized with ADC depends on its sampling rate. In currently available ADCs the faster is sampling rate the smaller is its depth (number of bits). Depth of the ADC determines relation between the smallest and highest observable signals and thus limits its dynamic range. Actually this is the main bottleneck of high resolution Noise Radars: conventional processing does not enable getting high range resolution and high dynamic range at the same time. In the paper we discuss ways to go around this drawback by changing signal processing ideology in noise radar. We present results of our consideration and design of two types of high resolution Noise Radar which uses slow ADCs: noise radar with digital generation of sounding signal and analog evaluation of cross-correlation and stepped frequency noise radar. We describe main ideas of these radar schemes and results of experimental tests of the approaches.
Źródło:
International Journal of Electronics and Telecommunications; 2012, 58, 2; 135-140
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Resolution Tips for Switching Magnetization MFM
Autorzy:
Precner, M.
Fedor, J.
Tóbik, J.
Šoltýs, J.
Cambel, V.
Powiązania:
https://bibliotekanauki.pl/articles/1372464.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.75.+a
75.70.-i
68.37.Rt
75.60.Jk
81.15.Ef
02.30.Nw
Opis:
Switching magnetization magnetic force microscopy (SM-MFM) is based on two-pass magnetic force microscopy with opposite orientation of tip magnetization between two scans. The sum of the scanned data with reversed tip magnetization depicts local van der Waals forces, and their difference maps the local magnetic forces. Tip magnetization can be easily reversed in external magnetic field during the scanning. The separation of the forces mapped enables scanning in close proximity of the sample (~5 nm). Therefore, extremely high spatial resolution (10 nm) is achievable by the SM-MFM. Image phase resolution of the MFM method depends on various geometric parameters of the tip, such as tip length, its apex radius and taper angle. The parameters are determined by the evaporation process, within which the standard atomic force microscopy tips are coated with magnetic layer. In this work we show that the thickness of the coated layer is important for the SM-MFM spatial resolution.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 386-387
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wysokorozdzielcza krystalografia makromolekuł
High resolution crystallography of macromolecules
Autorzy:
Gilski, M.
Powiązania:
https://bibliotekanauki.pl/articles/172659.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
krystalografia makromolekuł
struktury o rozdzielczości atomowej
więzy stereochemiczne
gęstość ładunku
macromolecular crystallography
atomic resolution structures
stereochemical restraints
charge density
Opis:
The recent developments and availability of modern third-generation synchrotron radiation facilities have a huge impact on macromolecular X-ray crystallography. In connection with a number of methodological improvements and new crystallographic software ranging from data processing to refinement, a unique opportunity has arisen to determine the macromolecular structures with unprecedented high resolution and quality, at a level traditionally reserved for small molecules. At this resolution, individual atoms are clearly resolved and fine details of the structures become visible directly in the electron density maps. The great importance of such structures is the possibility of having broader insights into macromolecule function. At very high resolution, hydrogen atoms can be seen in electron density maps and the detailed information about the protonation states of catalytically important residues can be studied, what often is critical for full understanding of enzymatic reactions. Atomic resolution gives the opportunity for clear definition of multiple conformations, although the proportion of disordered residues is higher at higher resolution, and the disorder is seen as distinct alternative conformations. Water in macromolecular crystal plays an important role in macromolecule’s function and stabilization. Ultrahigh resolution data allows to refine water molecules with anisotropic displacement parameters and refine them with fractional occupancies. In this situation analyzing the subtle hydrogen bond network, involving precisely located water molecules, is possible. Atomic resolution structures can be refined without or with only very weak stereochemical restraints. Macromolecular models refined at ultrahigh resolutions, for well ordered structures, can be used for validation and improvement of stereochemical restraint libraries, commonly used during refinement of macromolecular structures.
Źródło:
Wiadomości Chemiczne; 2014, 68, 5-6; 587-607
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uzyskiwanie termogramów o wysokiej rozdzielczości
Obtaining high resolution thermograms
Autorzy:
Zator, S.
Lasar, M.
Powiązania:
https://bibliotekanauki.pl/articles/156024.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
termografia
rozdzielczość
korekta
zniekształcenia
thermographs
resolution
correction
distortion
Opis:
W artykule przedstawiono sposób uzyskania termogramów z kamery wyposażonej w teleobiektyw, pozwalający uzyskać rozdzielczość 16-krotnie większą od standardowego. Korzystając z kamery o matrycy 320x240 pikseli uzyskano termogram o rozdzielczości 1,3 MPix w sposób zbliżony do tworzenia zdjęć typu panorama. Zautomatyzowany pomiar uzyskano przy pomocy precyzyjnej dwuosiowej obrotnicy, na której zainstalowano kamerę. Opracowano aplikację w środowisku LabVIEW z wykorzystaniem sterownika CompactRIO Real-Time Controller. W artykule przedstawione zostały wyniki działania programu.
The highest-resolution of matrices in thermovision cameras are 0.3 Mpix. One company offers a camera with a resolution of 1280x960 (1.3 megapixel) which was achieved by installing matrix on the micro-positioner. The paper describes how to obtain thermal images from a camera equipped with telephoto field of view 16-fold greater than the standard lens and shows a distortion correction process which exists in the lenses. Using the camera with a matrix of 320x240 pixels there was obtained a thermogram with a 1.3 megapixel camera in a similar way to creation of panorama images. The automated measurement was obtained using a biaxial turntable on which the camera was installed. There was worked out the application in LabVIEW environment with use of a controller CompactRIO Real-Time Controller for controlling stepper motors. The application allows connecting sequences of thermograms. The composed thermograms can be analyzed by the software that come with the camera. The results of the program running are presented in the paper.
Źródło:
Pomiary Automatyka Kontrola; 2011, R. 57, nr 12, 12; 1480-1482
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of high resolution methods to underwater data processing
Autorzy:
Minassian, G. R.
Powiązania:
https://bibliotekanauki.pl/articles/332479.pdf
Data publikacji:
1997
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
The statistical approach to the high resolution acoustic signal parameter estimation is considered. The models of the Green's function for a deterministic and a random oceanic waveguide are presented. A brief discussion of popular superresolution methods with application to direction-of-arrival (DOA) and travel time estimation is done. Application of high resolution methods (HRM) to underwater data processing requires that certain modeling assumptions be made. Using maximum likelihood theory, the optimum processing algorithm for amplitudes, angles of arrival and travel times estimation is developed. The proposed techniques take into account the deterministic and the stochastic structure of the acoustic field.
Źródło:
Hydroacoustics; 1997, 1; 209-212
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Resolution Eddy Current Tomography System for Nondestructive Testing
Autorzy:
Salach, J.
Szewczyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/1202343.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.70.Ex
81.70.Tx
Opis:
Idea of the high-resolution eddy current tomography is presented. Proposed system gives possibility of testing cylinder-shaped elements made of both magnetic and non-magnetic materials. To validate the concept, the tomographic measurements are carried out on set of steel cylinders with non-magnetic copper inclusion. Measurements were done during both linear and rotational movement of the element. Achieved results indicate the high sensitivity of system, which creates possibility of its application for non-destructive testing of the elements made of ferromagnetic and non-magnetic materials.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 402-403
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance of a High-Resolution Digital Positron-Lifetime Spectrometer
Autorzy:
Bečvář, F.
Čížek, J.
Procházka, I.
Powiązania:
https://bibliotekanauki.pl/articles/1812465.pdf
Data publikacji:
2008-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
This work describes a digital positron-lifetime spectrometer based on two ultrafast digitizers. Performance of the digital spectrometer in conditions of a routine measurement is compared with an analogue setup connected to the same detectors. It was found that engagement of the digital setup leads to an improvement of timing resolution (FWHM for $\text{}^{22}Na$) from 169 ps for the traditional analogue setup to 146 ps for the digital setup. The coincidence count rate for 1.2 MBq $\text{}^{22}Na$ source is 75-80 coinc./s for both configurations. These results clearly demonstrate the advantages of the digital timing over the traditional analogue setup.
Źródło:
Acta Physica Polonica A; 2008, 113, 5; 1279-1284
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-resolution thermal face dataset for face and expression recognition
Autorzy:
Kowalski, M.
Grudzień, A.
Powiązania:
https://bibliotekanauki.pl/articles/221388.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
face database
biometrics
thermal face recognition
infrared
face re-identification
Opis:
Development of facial recognition or expression recognition algorithms requires input data to thoroughly test the performance of algorithms in various conditions. Researchers are developing various methods to face challenges like illumination, pose and expression changes, as well as facial disguises. In this paper, we propose and establish a dataset of thermal facial images, which contains a set of neutral images in various poses as well as a set of facial images with different posed expressions collected with a thermal infrared camera. Since the properties of face in the thermal domain strongly depend on time, in order to show the impact of aging, collection of the dataset has been repeated and a corresponding set of data is provided. The paper describes the measurement methodology and database structure. We present baseline results of processing using state-of-the-art facial descriptors combined with distance metrics for thermal face re-identification. Three selected local descriptors, a histogram of oriented gradients, local binary patterns and local derivative patterns are used for elementary assessment of the database. The dataset offers a wide range of capabilities - from thermal face recognition to thermal expression recognition.
Źródło:
Metrology and Measurement Systems; 2018, 25, 2; 403-415
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of High-Resolution 3D Scanning in Medical Volumetry
Autorzy:
Chromy, A.
Powiązania:
https://bibliotekanauki.pl/articles/226316.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
medical volumetry
medical 3D scanning
3D scanning
medical imaging
soft tissues
Opis:
This paper deals with application of 3D scanning technology in medicine. Important properties of 3D scanners are discussed with emphasize on medical applications. Construction of medical 3D scanner according to these specifications is described and practical application of its use in medical volumetry is presented. Besides volumetry, such 3D scanner is usable for many other purposes, like monitoring of recovery process, ergonomic splint manufacturing or inflammation detection. 3D scanning introduces novel volumetric method, which is compared with standard methods. The new method is more accurate compared to present ones. Principles of this method are discussed in paper and its accuracy is evaluated and experimentally verified.
Źródło:
International Journal of Electronics and Telecommunications; 2016, 62, 1; 23-31
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Feature extraction in high-resolution raster images using neural networks
Autorzy:
Iwaniak, A.
Kubik, T.
Paluszyński, W.
Tymków, P.
Powiązania:
https://bibliotekanauki.pl/articles/225883.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
GIS projekt
sieci neuronowe
GIS project
neural network
Źródło:
Reports on Geodesy; 2006, z. 2/77; 263-271
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 196

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