Filters
total: 1081
-
Catalog
displaying 1000 best results Help
Search results for: TRF
-
Cost-Efficient Design Methodology for Compact Rat-Race Couplers
PublicationIn this article, a reliable and low-cost design methodology for simulation-driven optimization of miniaturized rat-race couplers (RRCs) is presented. We exploit a two-stage design approach, where a composite structure (a basic building block of the RRC structure) is first optimized using a pattern search algorithm, and, subsequently, the entire coupler is tuned by means of surrogate-based optimization (SBO) procedure. SBO is executed...
-
Compact Electromagnetic Lens Antennas Using Cascaded Metasurfaces for Gain Enhancement and Beam Steering Applications
PublicationElectromagnetic (EM) lens antenna designs using cascaded metasurfaces for gain enhancement and beam steering applications are proposed. Two different lens aperture designs are proposed and populated with aperiodic unit cells of size 0.2λo × 0.2λo. In lens Design 1, the unit cells of different phases are distributed in concentric circular zones, whereas in lens Design 2, the unit cells of different phases are distributed in vertical...
-
Fast geometry scaling of miniaturized microwave couplers with power split correction
PublicationRedesigning a microwave circuit for various operating conditions is a practically important yet challenging problem. The purpose of this article is development and presentation of a technique for fast geometry scaling of miniaturized microwave couplers with respect to operating frequency. Our approach exploits an inverse surrogate model constructed using several reference designs that are optimized for a set of operating frequencies...
-
Analysis of circular polarization antenna design trade‐offs using low‐cost EM‐driven multiobjective optimization
PublicationCircular polarization (CP) antennas are vital components of modern communication systems. Their design involves handling several requirements such as low reflection and axial ratio (AR) within the frequency range of interest. Small size is an important criterion for antenna mobility which is normally achieved as a by‐product of performance‐oriented modifications of the structure topology. In this work, multiobjective optimization...
-
Numerically efficient algorithm for compact microwave device optimization with flexible sensitivity updating scheme
PublicationAn efficient trust-region algorithm with flexible sensitivity updating management scheme for electromagnetic (EM)-driven design optimization of compact microwave components is proposed. During the optimization process, updating of selected columns of the circuit response Jacobian is performed using a rank-one Broyden formula (BF) replacing finite differentiation (FD). The FD update is omitted for directions sufficiently well aligned...
-
Accelerated multi-objective design of miniaturized microwave components by means of nested kriging surrogates
PublicationDesign of microwave components is an inherently multiobjective task. Often, the objectives are at least partially conflicting and the designer has to work out a suitable compromise. In practice, generating the best possible trade‐off designs requires multiobjective optimization, which is a computationally demanding task. If the structure of interest is evaluated through full‐wave electromagnetic (EM) analysis, the employment of...
-
Expedited simulation-driven design optimization of UWB antennas by means of response features
PublicationIn this work, a method for fast design optimization of broadband antennas is considered. The approach is based on a feature-based optimization (FBO) concept where reflection characteristics of the structure at hand are formulated in terms of suitably defined feature points. Redefinition of the design problem allows for reducing the design optimization cost, because the dependence of feature point coordinates on antenna dimensions...
-
Surrogate modeling of impedance matching transformers by means of variable‐fidelity electromagnetic simulations and nested cokriging
PublicationAccurate performance evaluation of microwave components can be carried out using full‐wave electromagnetic (EM) simulation tools, routinely employed for circuit verification but also in the design process itself. Unfortunately, the computational cost of EM‐driven design may be high. This is especially pertinent to tasks entailing considerable number of simulations (eg, parametric optimization, statistical analysis). A possible...
-
Squamous cell carcinoma, metastatic, NOS - Female, 68 - Tissue image [3290730016631641]
Open Research DataThis is the histopathological image of SKIN tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.
-
Transmission electron microscope (TEM) and optical microscope images of pristine and silica-coated bismuth oxide and gadolinium oxide particles
Open Research DataCollection of raw transmission electron microscope (TEM) micrographs and optical microscope images used in the associated manuscript. All data in accessible *.tif format. Zip package contains:
-
Svitlana Radetska, WILIS, Tr, I st, II sem, 22/23
e-Learning Courses -
Małgorzata Fenc, WILIŚ, TR, I st, 3 sem, 21/22z
e-Learning Courses -
Małgorzata Fenc, WILIŚ, TR, I st, 5 sem, 22/23z
e-Learning Courses -
Małgorzata Fenc, WILIŚ, TR, I st, 4 sem, 21/22l
e-Learning Courses -
Svitlana Radetska, WILIS, Tr, st. I, sem IV, 22/23
e-Learning Courses -
WILiŚ - Tr. gr. 2 i 3 - Matematyka 2016/17 (K.Dąbrowska)
e-Learning Courses -
Katarzyna Szałaj, WILiŚ, Tr, I st, 3 sem, 23/24z
e-Learning Courses -
'21/'22 Fakty i mity na temat żywności – od historii, która zabija po kanapowców-smartfonowców [PG_00057828]
e-Learning CoursesOd koczownictwa po GMO. 200 tysięcy lat bez lodówki. Głód i niewłaściwe odżywianie się - najwięksi ludobójcy w dziejach człowieka. Funkcjonowanie i rozwój ludzkości możliwy dzięki owocom największej rewolucji w swoich dziejach: rolnictwa. Przemiany gospodarcze, społeczne, polityczne, obyczajowe, etyczne, które następowały wraz z rozwojem rolnictwa. Technologiczny aspekt rozwoju produkcji żywności. Wykwintna kuchnia francuska...
-
Algorytmy Optymalizacji Dyskretnej - ed. 2021/2022
e-Learning CoursesIn real-world applications, many important practical problems are NP-hard, therefore it is expedient to consider not only the optimal solutions of NP-hard optimization problems, but also the solutions which are “close” to them (near-optimal solutions). So, we can try to design an approximation algorithm that efficiently produces a near-optimal solution for the NP-hard problem. In many cases we can even design approximation algorithms...
-
The Design of Cavity Resonators and Microwave Filters Applying Shape Deformation Techniques
PublicationThis article introduces shape deformation as a new approach to the computer-aided design (CAD) of high-frequency components. We show that geometry deformation opens up new design possibilities and offers additional degrees of freedom in the 3-D modeling of microwave structures. Such design flexibility is highly desirable if the full potential of additive manufacturing (AM) is to be exploited in the fabrication of RF and microwave...
-
Prediction of Overall In Vitro Microsomal Stability of Drug Candidates Based on Molecular Modeling and Support Vector Machines. Case Study of Novel Arylpiperazines Derivatives
PublicationOther than efficacy of interaction with the molecular target, metabolic stability is the primary factor responsible for the failure or success of a compound in the drug development pipeline. The ideal drug candidate should be stable enough to reach its therapeutic site of action. Despite many recent excellent achievements in the field of computational methods supporting drug metabolism studies, a well-recognized procedure to model...
-
Concentrations of monoaromatic hydrocarbons in the air of the underground car park and individual garages attached to residential buildings
PublicationThe paper describes the characteristics of a two-level underground car park and three individual garages attached to residential buildings, differing by the resident utilization habits, located in North Poland (Tri-City agglomeration area). The strategy of collecting the analyte samples from air in mentioned enclosed areas, concerning the determination of benzene, toluene, ethylbenzene, o-xylene and p,m-xylenes (BTEX) concentrations...
-
Development of fragility curves in adjacent steel moment-resisting frames considering pounding effects through improved wavelet-based refined damage-sensitive feature
PublicationFragility curves present useful information related to earthquake-induced probability assessment of steel moment-resisting frames (MRFs) and determine the probability of the damage exceedance at different floor levels of MRFs. The review of the literature shows that most of the previous studies dealing with the fragility curves were based on conventional measures, such as spectral acceleration at the first mode period, peak...
-
Synthesis of compounds with C-P-P and C=P-P bond systems based on the phospha-Wittig reaction
PublicationA reactivity study of a β-diketiminate titanium(III) phosphanylphosphido complex [MeNacNacTi(Cl){η2-P(SiMe3)-PtBu2}] (1) towards ketones such as benzophenone, 9-fluorenone, acetophenone, cyclopentanone, cyclohexanone and cycloheptanone is reported. The reactions of 1 with aromatic ketones (without α-protons) directly lead to the Ti(III) complex [MeNacNacTi(μ2-Cl)(OSiMe3)] (5) as well as Ti(IV) complexes with the pinacol condensation...
-
Seminarium dyplomowe 2023_sem 8
e-Learning CoursesSeminarium dyplomowe dotyczy zagadnień niezbędnych do opracowania projektu dyplomowego. Tematyka zajęć: Zasady sporządzania opisu technicznego (zakres w projekcie budowlanym a książeczka dyplomowa); Zagospodarowanie terenu (wytyczne wg normy, zakres, grubości linii itp. + przykładowe rysunki); Rzuty – zasady zapisu projektu budowlanego (wymiarowanie, grubości linii, stolarka, szrafy – wg normy, opisy itp. + przykładowe rysunki); Przekroje...
-
Marek Adamczyk, WILiŚ(Tr.), I st, 3 sem, 2023/24 Z
e-Learning Courses -
Witold Zbirohowski-Kościa, WOiO, Tr, I st, 4 sem, 20/21l
e-Learning Courses -
Marek Adamczyk, WILiŚ(Tr.), I st., 5 sem, 21/22 z
e-Learning Courses -
Marek Adamczyk, WILiŚ(Tr.), I st, 2 sem, 2022/23 L
e-Learning Courses -
Marek Adamczyk, WILiŚ(Tr.), II st, 1 sem, 23/24 L
e-Learning Courses -
WILiŚ - Tr. sem.2 ćw. gr 3 - Matematyka 2023/2024 (M.Suchecka)
e-Learning Courses -
Witold Zbirohowski-Kościa, WOiO, Tr, I st, 3 sem, 20/21z
e-Learning Courses -
Permanent traffic count stations - expressway S6 Poland 2016
Open Research DataThe data includes traffic data from permanent traffic count stations located on the expressway S6 in the Tri-City Agglomeration area in Poland. The data covers the 12 months of 2016.
-
Design and Optimization of Metamaterial-Based 5G Millimeter Wave Antenna for Gain Enhancement
PublicationIn this brief, a low profile, broadband, high-gain antenna array based on optimized metamaterials (MMs) with dual-beam radiation is reported for 5G millimeters wave (mm-wave) applications. The design is a simple bow tie operating at a 5G band of 28 GHz. It consists of two bow ties with substrate integrated waveguide (SIW)-based power splitter. A broad impedance bandwidth of 26.3−29.8 GHz is obtained by appropriately combining the...
-
Magnetic field maps of an astable multivibrator in frequency range from 30 MHz to 3 GHz – spatial detection
Open Research DataThe data presents a result of near field measurements of electromagnetic emissions radiated from the PCB of a small electronic device. An efficient method of modelling the magnetic and electric field emissions is the measurements in the near field using electric and magnetic probes. The attached files contain magnetic field maps created on based measurements...
-
Metoda Elementów Skończonych_Wykład (PG_00057399) MwBM iP sem1, zima 23/24
e-Learning CoursesWykład: Podstawy MES, sposoby dyskretyzacji, pojęcie elementu skończonego. Funkcja kształtu, sposoby tworzenia funkcji kształtu. Aproksymacja pól odkształceń i napręźeń w MES. Wyprowadzenie macierzy charakterystycznych elementu skończonego. Przykłady budowy macierzy charakterystycznych dla elementów jedno, dwu i trójwymiarowych. Wyprowadzenie równań ruchu ciała dyskretyzowanego MES. Tworzenie macierzy globalnych w MES. Modelowanie...
-
Investigation of RH effect on uncommon limonene ozonolysis products and SOA formation in indoor air with real time measurement techniques
PublicationScientific interest in SOA influence on indoor air quality increases since last 20 years. It is well known, that particles of nano-sized diameter pose a threat for human health causing, among others: eye, upper airway irritation, inflammatory response in cells, worsening asthma, hypertension, diabetes, and central nervous dysfunction. Terpenes are reactive VOCs, commonly emitted in indoor air and considered to be SOA precursors...
-
Advancing sustainable wastewater management: A comprehensive review of nutrient recovery products and their applications
PublicationWastewater serves as a vital resource for sustainable fertilizer production, particularly in the recovery of nitrogen (N) and phosphorus (P). This comprehensive study explores the recovery chain, from technology to final product reuse. Biomass growth is the most cost-effective method, valorizing up to 95 % of nutrients, although facing safety concerns. Various techniques enable the recovery of 100 % P and up to 99 % N, but challenges...
-
ESPAR Antenna-Based WSN Node With DoA Estimation Capability
PublicationIn this paper, we present a low-cost energy-efficient electronically steerable parasitic array radiator (ESPAR) antenna-based wireless sensor network (WSN) node designed for IEEE 802.15.4 standard that is capable of performing direction of arrival (DoA) estimation in real-life outdoor environments. To this end, we propose the WSN node architecture, design and realization that utilizes NXP JN5168 radio frequency (RF) wireless transceiver...
-
Editorial for the special issue on advances in forward and inverse surrogate modeling for high-frequency design
PublicationThe design of modern‐day high‐frequency devices and circuits, including microwave/RF, antenna and photonic components, historically has relied on full‐wave electromagnetic (EM) simulation tools. Initially used for design verification, EM simulations are nowadays used in the design process itself, for example, for finding optimum values of geometry and/or material parameters of the structures of interest. In a growing number of...
-
Magnetic field maps of an astable multivibrator in frequency range from 30 MHz to 3 GHz – selective detection
Open Research DataThe data presents a result of near field measurements of electromagnetic emissions radiated from the PCB of a small electronic device. An efficient method of modelling the magnetic and electric field emissions is the measurements in the near field using electric and magnetic probes. The attached files contain magnetic field maps created on based measurements...
-
Przestrzenie Inteligentne - 2022/2023
e-Learning CoursesCelem przedmiotu jest wprowadzenie do zagadnień praktycznych przestrzeni inteligentnych (np. inteligentny dom wykorzystujący urządzenia IoT, inteligentna fabryka w ramach Przemysłu 4.0, etc.) w oparciu o przetwarzanie sygnałów radiowych RF (ang. radio frequency) w celu dostarczenia wymaganych funkcjonalności w bezprzewodowych systemach wbudowanych.
-
Przestrzenie Inteligentne - 2023/2024
e-Learning CoursesCelem przedmiotu jest wprowadzenie do zagadnień praktycznych przestrzeni inteligentnych (np. inteligentny dom wykorzystujący urządzenia IoT, inteligentna fabryka w ramach Przemysłu 4.0, etc.) w oparciu o przetwarzanie sygnałów radiowych RF (ang. radio frequency) w celu dostarczenia wymaganych funkcjonalności w bezprzewodowych systemach wbudowanych.
-
Dominika Karaś, WILIŚ, TR+GIK+IŚ, st. II, sem.3, 22/23l
e-Learning Courses -
Ewa Rogala, WILiŚ, IŚ+TR+GiK, st. II, sem. 3, 20/21l
e-Learning Courses -
Małgorzata Piechocińska WIMiO OiO, TR,L II st. 1 sem. 2021/22l
e-Learning Courses -
Dominika Karaś, WILiŚ, GiK+TR+IŚ, II st, sem 3, 22/23
e-Learning Courses -
J. Pawlak-Mikuć (5) Tr -WILiŚ Ist, V sem, 2023/2024 z
e-Learning Courses -
WILiŚ - Tr. sem.1 ćw. gr 2, 3 - Matematyka 2023/2024 (M.Suchecka)
e-Learning Courses -
Video traffic data - Interchange Karczemki (S6-501)
Open Research DataThe data includes video traffic data registered with 5 video cameras at weaving area (weaving section type A) of the Karczemki interchange within S6 expressway in Poland (interchange of expressway S6 and regional road 501), located in the Tri-City Agglomeration . The data covers the one day: 10.10.2017 (expressway S6).