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Search results for: radio
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Zhonghua fang she xue za zhi Chinese journal of radiology
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Oral Surgery Oral Medicine Oral Pathology Oral Radiology and Endodontology
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GPU-Accelerated 3D Mesh Deformation for Optimization Based on the Finite Element Method
PublicationThis paper discusses a strategy for speeding up the mesh deformation process in the design-byoptimization of high-frequency components involving electromagnetic field simulations using the 3D finite element method (FEM). The mesh deformation is assumed to be described by a linear elasticity model of a rigid body; therefore, each time the shape of the device is changed, an auxiliary elasticity finite-element problem must be solved....
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Broadband Compact Single-Layer Magic-T Junction with Separation of DC Signals between All Ports
PublicationA novel structure for a four-port microstrip magic-T junction is presented. The device is composed of microstrip and slotline circuits etched onto two sides of a dielectric substrate. The device is extremely compact and occupies an area more than three times smaller than similar structures recently reported in the literature. The novelty of the device lies in the use of microstrip/slotline transitions for both input ports: summation...
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Single and Dual-GPU Generalized Sparse Eigenvalue Solvers for Finding a Few Low-Order Resonances of a Microwave Cavity Using the Finite-Element Method
PublicationThis paper presents two fast generalized eigenvalue solvers for sparse symmetric matrices that arise when electromagnetic cavity resonances are investigated using the higher-order finite element method (FEM). To find a few loworder resonances, the locally optimal block preconditioned conjugate gradient (LOBPCG) algorithm with null-space deflation is applied. The computations are expedited by using one or two graphical processing...
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Pipelined Two-Operand Modular Adders
PublicationPipelined two-operand modular adder (TOMA) is one of basic components used in digital signal processing (DSP) systems that use the residue number system (RNS). Such modular adders are used in binary/residue and residue/binary converters, residue multipliers and scalers as well as within residue processing channels. The structure of pipelined TOMAs is usually obtained by inserting an appropriate number of pipeline register layers within...
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Mutual Coupling Between IFF/SSR Microstrip Antennas with Reduced Transversal Size- Experimental Study
PublicationW artykule opisano wyniki symulacji oraz pomiarów sprzężeń wzajemnych anten systemu IFF. Wyniki poprzedza analiza konfiguracji i działania pojedynczej anteny zasilanej szczeliną typu H. Badania przeprowadzono dla szyku poziomego i pionowego, w zakresie wejściowego współczynnika odbicia oraz współczynnika sprzężenia na dwóch częstotliwościach pasma IFF.
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Parallel Implementation of the Discrete Green's Function Formulation of the FDTD Method on a Multicore Central Processing Unit
PublicationParallel implementation of the discrete Green's function formulation of the finite-difference time-domain (DGF-FDTD) method was developed on a multicore central processing unit. DGF-FDTD avoids computations of the electromagnetic field in free-space cells and does not require domain termination by absorbing boundary conditions. Computed DGF-FDTD solutions are compatible with the FDTD grid enabling the perfect hybridization of FDTD...
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A Systematic Search for New Coupling Schemes of Cross-Coupled Resonator Bandpass Filters
PublicationIn this paper, a systematic approach to an extensive search for topologies of cross-coupled filters with generalized Chebyshev response is presented. The technique applies graph theory to find unique, nonisomorphic filter configurations, and tests whether a specific frequency response can be realized in a given set of topologies. The results of the search are then stored in a database of possible filter configurations.
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An Efficient Framework For Fast Computer Aided Design of Microwave Circuits Based on the Higher-Order 3D Finite-Element Method
PublicationIn this paper, an efficient computational framework for the full-wave design by optimization of complex microwave passive devices, such as antennas, filters, and multiplexers, is described. The framework consists of a computational engine, a 3D object modeler, and a graphical user interface. The computational engine, which is based on a finite element method with curvilinear higher-order tetrahedral elements, is coupled with built-in...
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Efficient analysis of structures with rotatable elements using model order reduction
PublicationThis paper presents a novel full-wave technique which allows for a fast 3D finite element analysis of waveguide structures containing rotatable tuning elements of arbitrary shapes. Rotation of these elements changes the resonant frequencies of the structure, which can be used in the tuning process to obtain the S-characteristics desired for the device. For fast commutations of the response as the tuning elements are rotated, the...
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Residue-Pole Methods for Variability Analysis of S-parameters of Microwave Devices with 3D FEM and Mesh Deformation
PublicationThis paper presents a new approach for variability analysis of microwave devices with a high dimension of uncertain parameters. The proposed technique is based on modeling an approximation of system by its poles and residues using several modeling methods, including ordinary kriging, Adaptive Polynomial Chaos (APCE), and Support Vector Machine Regression (SVM). The computational cost is compared with the traditional Monte-Carlo...
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Efficient Gradient-Based Algorithm with Numerical Derivatives for Expedited Optimization of Multi-Parameter Miniaturized Impedance Matching Transformers
PublicationFull-wave electromagnetic (EM) simulation tools have become ubiquitous in the design of microwave components. In some cases, e.g., miniaturized microstrip components, EM analysis is mandatory due to considera¬ble cross-coupling effects that cannot be accounted for otherwise (e.g., by means of equivalent circuits). These effects are particularly pronounced in the structures in¬volving slow-wave compact cells and their numerical...
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Design and optimization of a novel compact broadband linearly/circularly polarized wide-slot antenna for WLAN and Wi-MAX applications
PublicationA novel topologically modified structure of a compact low profile wide-slot antenna for broadband applications is presented. The antenna comprises a modified E-shaped slot with unequal arm lengths in the ground plane, and a parasitic quasi-rectangular loop placed coplanar with the feedline. For exciting orthogonal modes with equal amplitude, a single-point feeding technique with an asymmetrical geometry of the coplanar waveguide...
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Wavelet filtering of signals without using model functions
PublicationThe effective wavelet filtering of real signals is impossible without determining their shape. The shape of a real signal is related to its wavelet spectrum. For shape analysis, a continuous color wavelet spectrogram of signal level is often used. The disadvantage of continuous wavelet spectrogram is the complexity of analyzing a blurry color image. A real signal with additive noise strongly distorts the spectrogram based on continuous...
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OC-0265: Whole body response to radiation in head and neck and prostate cancer patient; the serum proteome comparative analysis
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Serum miRNA-based signature indicates radiation exposure and dose in humans: A multicenter diagnostic biomarker study
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A link between seasonality and radiation-related toxicity: The big time or time will tell?
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Nasal endoscopy: an adjunct to patient selection for preoperative low-dose CT examination in chronic rhinosinusitis
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Toenail selenium level among healthy residents of two polish districts
PublicationCelem pracy było badanie zawartości selenu w próbkach paznokci pobranych od mieszkańców Województwa Pomorskiego i Lubuskiego. Wykazano, że średnie stężenia Se w próbkach paznokci wynosiło odpowiednio 0,57 ± 0,10, 0,60 ± 0,16 mg kg-1. Stwierdzono także, że płeć, wiek, wskaźnik masy ciała, status palenia oraz przyjmowanie Se w postaci suplementów diety przez uczestników badania wpływa istotnie statystycznie na poziom...
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Assessment of atmospheric inorganic pollution in the urban region of Gdańsk, Northern Poland
PublicationProjekt wykonano w przemysłowej części Gdańska w celu zidentyfikowania głównych źródeł zanieczyszczeń. Próbki suchego oraz żywego (w hodowli hydroponicznej) mchu eksponowano równolegle w celu określenia ich właściwości kumulacji w aspekcie badań biomonitoringowych. Analizę chemiczną składu próbek mchu wykonano dzięki zastosowaniu techniki aktywacji neutronowej i reaktorze badawczym w Delft (Holandia). Uzyskane wyniki wskazują,...
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Quantitative magnetic resonance assessment of brain atrophy related to selected aspects of disability in patients with multiple sclerosis: preliminary results
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Adjusted subpixel method enables optimisation of bronchial measurements in high-resolution CT
PublicationArtykuł przedstawia metodę korekcji pomiaru rozmiaru oskrzeli w techice HRCT. W celu walidacji metody zastosowano fantom. W efekcie opracowano metodę nieliniowej predykcji rzeczywistych rozmiarów ścianek małych oskrzeli w obrazach HRCT.
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Application of adjusted subpixel method (ASM) in HRCT measurements of the bronchi in bronchial asthma patients and healthy individuals
PublicationBackground: Recently, we described a model system which included corrections of high-resolution computedtomography (HRCT) bronchial measurements based on the adjusted subpixel method (ASM).Objective: To verify the clinical application of ASM by comparing bronchial measurements obtained bymeans of the traditional eye-driven method, subpixel method alone and ASM in a group comprised ofbronchial asthma patients and healthy individuals.Methods:...
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Left Ventricular Mass: Correlation with Fatness, Hemodynamics and Renal Morphology
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Microbeam radiation therapy: Tissue dose penetration and BANG-gel dosimetry of thick-beams’ array interlacing
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Perfusion computed tomography: 4 cmversus8 cm coverage size in subjects with chronic carotid artery stenosis
PublicationOBJECTIVE: The impact of coverage size on global cerebral blood flow (CBF), cerebral blood volume (CBV), mean transit time (MTT) and time to peak (TTP) parameters has not been investigated in patients with chronic carotid artery stenosis. METHODS: 63 patients with stenosis of >70% within a single internal carotid artery and neurological symptoms were randomly assigned to two well-matched groups. Differences in CT perfusion scan...
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292. Cisplatin and 5-fluorouracil in recurrent, persistent or metastatic cervical carcinoma
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260. The role of patients and doctors in making decisions about the choice of the kind of adjuvant treatment in early brest cancer
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Słowno-graficzny znak towarowy RADIOCOM
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Zespół Inżynierii Mikrofalowej i Antenowej
Research TeamsSpecjalność badawcza KIMiA wiąże się z techniką b.w.cz. i dotyczy zakresu częstotliwości od setek megaherców do kilkudziesięciu gigaherców. Przedmiotem badań teoretycznych (analiza, synteza, symulacja i modelowanie komputerowe,) oraz eksperymentalnych są elementy (prowadnice, sprzęgacze, rozgałęzienia) oraz układy pasywne (cyrkulatory, przesuwniki fazy, obciążenia, tłumiki) i aktywne (wzmacniacze, mieszacze, powielacze, modulatory),...
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RFCSET RF / Microwave communication subsystems for emerging wireless technologies
ProjectsProject realized in Faculty of Electronics, Telecommunications and Informatics according to 618/N-COST/09/2010/0 agreement from 2009-12-22
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DUCH IoT A software-defined, universal radio interface for intelligent devices of Internet of Things
ProjectsProject realized in Department of Radiocommunication Systems and Networks according to POIR.01.01.01-00-1025/19-00 agreement from 2020-05-28
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INN3D Innovations in 3D gel dosimetry for proton radiotherapy of cancer
ProjectsProject realized in Faculty of Applied Physics and Mathematics according to UMOWA Nr SKN/SP/535558/2022 agreement from 2022-04-14
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Układ do kształtowania widma sygnału radiowego
InventionsPrzedmiotem projektu jest demonstrator technologii C-IED, przeznaczony do przeciwdziałania atakom terrorystycznym z wykorzystaniem prowizorycznych urządzeń wybuchowych detonowanych drogą radiową. Prowizoryczne urządzenia IED zwykle są umieszczane w dużych skupiskach ludzi oraz maskowane w celu utrudnienia ich identyfikacji, przy użyciu płaszcza, folii, butelki, opony czy betonu. Urządzenia te pozwalają na wyrządzenie znacznych...
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Expedited design of compact microwave and RF structures
ProjectsProject realized in Department of Microelectronic Systems according to UMO-2014/15/B/ST7/04683 agreement from 2015-07-15
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Decision support system for small vessel disease diagnosis, leveraging the synergy of machine learning and radiomics
ProjectsProject realized in Katedra Inteligentnych Systemów Sterowania i Wspomagania Decyzji
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Układ do wyznaczania kierunku nadejścia sygnału radiowego
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New concepts in microwave filters, phasers and multifunctional passive circuits for future RF systems
ProjectsProject realized in Department of Microwave and Antenna Engineering according to UMO-2019/33/B/ST7/00889 agreement from 2020-08-03
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Boron-Basalt fibers Development of boron-infused basalt-fiber concrete for nuclear and radioactive waste management applications
ProjectsProject realized in Department of Building Structures and Material Engineering according to UMO-2017/26/Z/ST8/01240 agreement from 2018-07-31
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Sposób pomiaru czasu nadejścia sygnałów w systemie radiolokalizacyjnym opartym na technice DS-CDMA
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Sposób przesyłania informacji dla potrzeb internetu rzeczy, zwłaszcza poza obszarem działania sieci radiokomunikacyjnych
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NUTA RI Research internship at the National Technical University of Athens on the study of geometric and radiometric calibration methods for multi-camera remote sensing systems under artificial illumination.
ProjectsProject realized in Department of Geodesy
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SDIDS Software-Defined Device for Detecting and Mitigating the Inner, Outer system Interferences and Hidden Transmissions in the 4G-LTE, 5G-NR radio interfaces
ProjectsProject realized in Department of Radiocommunication Systems and Networks according to LIDER14/0116/2023 agreement from 2024-02-13
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Sposób lokalizacji osób i/lub obiektów wewnątrz i/lub na zewnątrz budynków drogą komunikacji radiowej
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BEYOND5 Building the fully European supplY chain on RFSOI, enabling New RF Domains forSensing, Communication, 5G and beyond
ProjectsProject realized in Department of Microwave and Antenna Engineering according to 494998 agreement from 2021-03-08
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Radiosensitizing derivatives of pyrimidine or purine nucleobases: Mass spectrometry and quantum chemical studies on low-energy electron interactions in gas phase, water clusters and solutions
ProjectsProject realized in Department of Organic Chemistry according to UMO-2020/02/Y/ST4/00110 agreement from 2021-07-12
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Stanowisko badawcze "Odporność urządzeń elektrycznych i elektronicznych na zaburzenia przewodzone, indukowane przez pola o częstotliwości radiowej"
Research EquipmentWykonywanie badań odporności urządzeń elektrycznych i elektronicznych na zaburzenia przewodzone, indukowane przez pola o częstotliwości radiowej, w świetle dyrektywy EMC 2004/108/WE, dotyczącej kompatybilności elektromagnetycznej urządzeń.
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BEYOND5 Building the fully European supplY chain on RFSOI, enabling New RF Domains for Sensing, Communication, 5G and beyond
ProjectsProject realized in Department of Microwave and Antenna Engineering according to 876124 agreement from 2020-05-28
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Sposób otrzymywania rekombinantowego szczepu Escherichia coli Rosetta (DE3) pLysS oraz sposób wytwarzania białka syntazy trehalozy Deinococcus radiodurans DSMZ 20539
Inventions