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Wyszukujesz frazę ""Skalski, A."" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-10 z 10
    Tytuł:
    Powder injection moulding of micro parts
    Autorzy:
    Biało, D.
    Skalski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/385216.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    powder
    injection moulding
    debinding
    micro parts
    shrinkage
    Opis:
    This paper presents and discusses individual phases of forming micro parts using the injection moulding method. Tests involving the preparing of feedstock for the process of injection micro moulding were conducted. The rheological properties for binder-powder compositions were also defined. Tests were conducted for 316L stainless steel and iron metal powders and Al2O3 ceramics with granularity ranging from 0.135 žm to 16 žm. Binders consisted of polyethylene, paraffin and wax. Technological parameters of the process of injection micro moulding are presented, including the impact of individual factors on the filling of the mould cavities. Moreover, results of tests with respect to the shrinking of the micro parts as well as of the structure of the material following sintering are presented.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 87-90
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heart segmentation in echo images
    Autorzy:
    Skalski, A.
    Turcza, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/220439.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    echocardiography
    image segmentation
    level set method
    Hough transform
    shape estimation
    Opis:
    Cardiovascular system diseases are the major causes of mortality in the world. The most important and widely used tool for assessing the heart state is echocardiography (also abbreviated as ECHO). ECHO images are used e.g. for location of any damage of heart tissues, in calculation of cardiac tissue displacement at any arbitrary point and to derive useful heart parameters like size and shape, cardiac output, ejection fraction, pumping capacity. In this paper, a robust algorithm for heart shape estimation (segmentation) in ECHO images is proposed. It is based on the recently introduced variant of the level set method called level set without edges. This variant takes advantage of the intensity value of area information instead of module of gradient which is typically used. Such approach guarantees stability and correctness of algorithm working on the border between object and background with small absolute value of image gradient. To reassure meaningful results, the image segmentation is proceeded with automatic Region of Interest (ROI) calculation. The main idea of ROI calculations is to receive a triangle-like part of the acquired ECHO image, using linear Hough transform, thresholding and simple mathematics. Additionally, in order to improve the images quality, an anisotropic diffusion filter, before ROI calculation, was used. The proposed method has been tested on real echocardiographic image sequences. Derived results confirm the effectiveness of the presented method.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 2; 305-314
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analyses of micro moulding process of the microelements from ceramic powders
    Autorzy:
    Skalski, A.
    Biało, D.
    Wisniewski, W.
    Paszkowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/384359.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    injection moulding
    microelements
    ceramic powders
    Opis:
    The article discusses the issues related to moulding of micro-elements from powder materials and it covers the first stage of the process - injecting to the mould cavity and filling the micro-channels. The material, which constituted the composition of a special thermoplastic binder and ceramic powder, was injected. The binder consisted of paraffin, polyethylene, wax and stearic acid. The nanometer powders from Al2O3 ceramic material with granularity of 660 nm and 135 nm and irregularly shaped particles were used. Different loading of composition by powder were used. The analyses of the impact of injection parameters, such as the mould-s temperature and the temperature of the material, on the quality of filling the micro-mould cavity with the material, were presented. The special moulding insert with micro-channels was made to perform the analyses to that effect with width from 50 to 1000 mm. The presented results of filling the micro-channels indicate considerable influence of the mould's temperature and the cross-section of microchannels. Slight impact of the material's temperature was observed; however, this factor does not have a considerable influence on filling the channel. The obtained information was used in the experiments of injection the samples for bending tests and tensile tests, and the shapes in the form of toothed wheels.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2012, 6, 2; 51-54
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of magnetorheological fluids and elastomers in today’s world
    Autorzy:
    Skalski, A.
    Kalita, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/386217.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    damper
    magnetorheological fluid
    magnetorheological elastomer
    smart material
    shock absorber
    application
    Opis:
    This paper explains the role of magnetorheological fluids and elastomers in today’s world. A review of applications of magnetorheological fluids and elastomers in devices and machines is presented. Magnetorheological fluids and elastomers belong to the smart materials family. Properties of magnetorheological fluids and elastomers can be controlled by a magnetic field. Compared with magnetorheological fluids, magnetorheological elastomers overcome the problems accompanying applications of MR fluids, such as sedimentation, sealing issues and environmental contamination. Magnetorheological fluids and elastomers, due to their ability of dampening vibrations in the presence of a controlled magnetic field, have great potential present and future applications in transport. Magnetorheological fluids are used e.g. dampers, shock absorbers, clutches and brakes. Magnetorheological dampers and magnetorheological shock absorbers are applied e.g. in damping control, in the operation of buildings and bridges, as well as in damping of high-tension wires. In the automotive industry, new solutions involving magnetorheological elastomer are increasingly patented e.g. adaptive system of energy absorption, system of magnetically dissociable [hooks/detents/grips], an vibration reduction system of the car’s drive shaft. The application of magnetorheological elastomer in the aviation structure is presented as well.
    Źródło:
    Acta Mechanica et Automatica; 2017, 11, 4; 267-274
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metrological Analysis Of Microsoft Kinect In The Context Of Object Localization
    Autorzy:
    Skalski, A.
    Machura, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/221384.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Kinect motion sensor
    localization
    camera calibration
    measurement precision
    robustness
    Opis:
    This paper presents a comprehensive metrological analysis of the Microsoft Kinect motion sensor performed using a proprietary flat marker. The designed marker was used to estimate its position in the external coordinate system associated with the sensor. The study includes calibration of the RGB and IR cameras, parameter identification and image registration. The metrological analysis is based on the data corrected for sensor optical distortions. From the metrological point of view, localization errors are related to the distance of an object from the sensor. Therefore, the rotation angles were determined and an accuracy assessment of the depth maps was performed. The analysis was carried out for the distances from the marker in the range of 0.8-1.65 m. The maximum average error was equal to 23 mm for the distance of 1.6 m.
    Źródło:
    Metrology and Measurement Systems; 2015, 22, 4; 469-478
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic analysis assessment in speech pathology detection
    Autorzy:
    Panek, D.
    Skalski, A.
    Gajda, J.
    Tadeusiewicz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/329710.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    linear PCA
    nonlinear PCA
    autoassociative neural network
    validation
    voice pathology detection
    Opis:
    Automatic detection of voice pathologies enables non-invasive, low cost and objective assessments of the presence of disorders, as well as accelerating and improving the process of diagnosis and clinical treatment given to patients. In this work, a vector made up of 28 acoustic parameters is evaluated using principal component analysis (PCA), kernel principal component analysis (kPCA) and an auto-associative neural network (NLPCA) in four kinds of pathology detection (hyperfunctional dysphonia, functional dysphonia, laryngitis, vocal cord paralysis) using the a, i and u vowels, spoken at a high, low and normal pitch. The results indicate that the kPCA and NLPCA methods can be considered a step towards pathology detection of the vocal folds. The results show that such an approach provides acceptable results for this purpose, with the best efficiency levels of around 100%. The study brings the most commonly used approaches to speech signal processing together and leads to a comparison of the machine learning methods determining the health status of the patient.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2015, 25, 3; 631-643
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kidney Segmentation in CT Data Using Hybrid Level-Set Method with Ellipsoidal Shape Constraints
    Autorzy:
    Skalski, A.
    Heryan, K.
    Jakubowski, J.
    Drewniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/221728.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Level Set method
    kidney
    CT data
    image segmentation
    ellipsoid
    Opis:
    With development of medical diagnostic and imaging techniques the sparing surgeries are facilitated. Renal cancer is one of examples. In order to minimize the amount of healthy kidney removed during the treatment procedure, it is essential to design a system that provides three-dimensional visualization prior to the surgery. The information about location of crucial structures (e.g. kidney, renal ureter and arteries) and their mutual spatial arrangement should be delivered to the operator. The introduction of such a system meets both the requirements and expectations of oncological surgeons. In this paper, we present one of the most important steps towards building such a system: a new approach to kidney segmentation from Computed Tomography data. The segmentation is based on the Active Contour Method using the Level Set (LS) framework. During the segmentation process the energy functional describing an image is the subject to minimize. The functional proposed in this paper consists of four terms. In contrast to the original approach containing solely the region and boundary terms, the ellipsoidal shape constraint was also introduced. This additional limitation imposed on evolution of the function prevents from leakage to undesired regions. The proposed methodology was tested on 10 Computed Tomography scans from patients diagnosed with renal cancer. The database contained the results of studies performed in several medical centers and on different devices. The average effectiveness of the proposed solution regarding the Dice Coefficient and average Hausdorff distance was equal to 0.862 and 2.37 mm, respectively. Both the qualitative and quantitative evaluations confirm effectiveness of the proposed solution.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 1; 101-112
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Applications of metallic composites in the automotive industry and their machining by the EDM
    Autorzy:
    Bialo, D.
    Peronczyk, J.
    Skalski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/950159.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    aluminium matrix composites
    automotive industry
    electro discharge machining
    EDM productivity
    surface roughness
    Opis:
    The article deals with the problems of application of aluminium matrix composites in car industry and electro discharge machining (EDM) of selected composites, which are used for engine pistons. Composites with Al+20%Si+3%Cu+1%Mg matrix were manufacturing by the powder metallurgy route in the process of cold compaction, degassing and hot extrusion. As the reinforcing phase Al2O3 particles with average size of 3, 9, 23 and 53 μm were used. Samples had constant reinforcing phase 5 and 10 % by volume. Electro discharge machining was performed using machine equipped with RLC generator. Four modes of energy of single discharge Ei in the range of 0.165 to 2.268 mJ were applied. EDM was carried out in a free – system. The main parameters determined after machining were volumetric productivity Vw (mm3 /min) and roughness of the machined surface expressed as Ra. It was shown that energy of single discharge influence mainly on the EDM process running. The higher was Ei, the higher were value of Vw. Increasing particle granularity from 3 to 53 μm caused decreasing in process productivity 13 to 19%. Ei affects the surface roughness during EDM. The value of Ra increases as this energy increases. When the size of reinforcing particles is growing, roughness parameter Ra is also growing.
    Źródło:
    Journal of KONES; 2018, 25, 1; 15-23
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Automatic Extraction of the Pelvicalyceal System for Preoperative Planning of Minimally Invasive Procedures
    Autorzy:
    Heryan, K.
    Skalski, A.
    Jakubowski, J.
    Drewniak, T.
    Gajda, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/220364.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pelvicalyceal system segmentation
    kidney segmentation
    kidney compartments
    Computed Tomography (CT)
    kidney cancer
    Opis:
    Minimally invasive procedures for the kidney tumour removal require a 3D visualization of topological relations between kidney, cancer, the pelvicalyceal system and the renal vascular tree. In this paper, a novel methodology of the pelvicalyceal system segmentation is presented. It consists of four following steps: ROI designation, automatic threshold calculation for binarization (approximation of the histogram image data with three exponential functions), automatic extraction of the pelvicalyceal system parts and segmentation by the Locally Adaptive Region Growing algorithm. The proposed method was applied successfully on the Computed Tomography database consisting of 48 kidneys both healthy and cancer affected. The quantitative evaluation (comparison to manual segmentation) and visual assessment proved its effectiveness. The Dice Coefficient of Similarity is equal to 0.871 ± 0.060 and the average Hausdorff distance 0.46 ± 0.36 mm. Additionally, to provide a reliable assessment of the proposed method, it was compared with three other methods. The proposed method is robust regardless of the image acquisition mode, spatial resolution and range of image values. The same framework may be applied to further medical applications beyond preoperative planning for partial nephrectomy enabling to visually assess and to measure the pelvicalyceal system by medical doctors.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 1; 3-18
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies on the Lepidoptera from fossil resins. Part II. Epiborkhausenites obscurotrimaculatus gen. et sp. nov. (Oecophoridae) and a tineid-moth discovered in the Baltic amber
    Studia nad motylami (Lepidoptera) z żywic kopalnych. Część II. Epiborkhausenites obscurotrimaculatus gen. et sp. nov. (Oecophoridae) i przedstawiciel Tineidae z bursztynu bałtyckiego
    K izucheniju cheshyekrylykh (Lepidoptera) iskopaemykh smol. Chast' II. Epiborkhausenites obscurotrimaculatus gen. et sp. nov. (Oecophoridae) i predstavitel' Tineidae iz baltijjskogo jantarja
    Autorzy:
    Skalski, A.W.
    Powiązania:
    https://bibliotekanauki.pl/articles/20527.pdf
    Data publikacji:
    1973
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Źródło:
    Acta Palaeontologica Polonica; 1973, 18, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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