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Nadzór naukowy nad projektowaniem i budową mostu przez Wisłę pod Kwidzynem
PublicationArtykuł prdstawia rezultaty prac związanych z projektowaniem i budową mostu prez Wisłę
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Certyfikowanie nurków-spawaczy przy spawaniu mokrym pod wodą w warunkach hiperbarycznych
PublicationW artykule omówiono wymagania normy PN-EN ISO 15618-1:2002: Egzamin kwalifikacyjny spawaczy w zakresie spawania podwodnego. Część 1: Spawacze-nurkowie spawający na mokro w warunkach hiperbarycznych. Podano zakresy możliwych do uzyskania zakresów kwalifikacji, wytyczne odnośnie wszystkich zmiennych zasadniczych ujętych w normie oraz przykłady oznaczenia uprawnień nurka-spawacza. Wskazano treści, które należy poddać analizie przy...
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Analiza odpadów z aglomeracji trójmiejskiej pod kątem termicznego wykorzystania frakcji energetycznej
PublicationPrzedstawiono wyniki badań odpadów komunalnych pod katem ich właściwości technologicznych mając na uwadze wyodrębnianie frakcji energetycznych dla projektowanego zakładu termicznej utylizacji w województwie pomorskim. Zakład ten ma przetwarzać frakcje energetyczną ze wszystkich jednostek mechaniczno-biologicznego przetwarzania odpadów komunalnych w regionie. Poszczególne oznaczenia wykonane zostały zgodnie z Polską Normą, normami...
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Accuracy of a low-cost autonomous hexacopter platforms navigation module for a photogrammetric and environmental measurements
PublicationA photogrammetry and environmental measurements from an unmanned aerial vehicle (UAV) are a low-cost alternative for a traditional aerial photogrammetry. A commercial off-the-shelf products (COTS) offers a variety of cheap components that a suitable to be used on board a UAV. In this paper a low-cost navigation module based on Ublox NEO-M8N GPS and Pixhawk flight controller have been described, as a main extrinsic parameters source...
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Zastosowanie iniekcji cementowej pod podstawami pali wierconych posadowionych w iłach pęczniejących.
PublicationW pracy scharakteryzowano metodę iniekcji pod podstawy pali wierconych wg patentu Katedry Geotechniki Politechniki Gdańskiej. Przedstawiono dwa przykłady zastosowania metody dla pali wykonanych w iłach pęczniejących.
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Zastosowanie iniekcji cementowej pod podstawami pali wierconych posadowionych w iłach pęczniejących
PublicationW pracy scharakteryzowano metodę iniekcji pod podstawy pali wierconych wg patentu Katedry Geotechniki Politechniki Gdańskiej. Przedstawiono dwa przykłady zastosowania metody dla pali wykonanych w iłach pęczniejących.
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Problems of the starting and operating of hydraulic components and systems in low ambient temperature (Part II)
PublicationPodczas rozruchu zespołów hydraulicznych w warunkach szoku termicznego dochodzi do dynamicznej zmiany wymiarów elementów tych zespołów. Odkształcenia elementów powodują zmianę efektywnego luzu między współpracującymi elementami. Na zmiany luzu ma pływ między innymi: różnica temperatur pomiędzy gorącym olejem a zimnym zespołem hydraulicznym, natężeniem przepływu czynnika roboczego, konstrukcji zespołu, rodzaju materiału i kształtu...
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Determination of ability of machines with hydraulic drive during start-up in low ambient temperatures
PublicationW artykule przedstawiono sposoby określania zdatności maszyn z napędem hydraulicznym podczas rozruchu w niskich temperaturach otoczenia. Przedstawiono wyniki badań eksperymentalnych i symulacji komputerowej nagrzewania się układów maszyny roboczych i zespołów hydraulicznych podczas rozruchu w warunkach szoku termicznego.
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Ocena możliwości spawania pod wodą drutem proszkowym metodą lokalnej komory suchej
PublicationW artykule przestawiono charakterystykę spawania pod wodą metodą lokalnej komory suchej. Na postawie badań eksperymentalnych oceniono możliwość zastosowania drutu proszkowego stosowanego do spawania na powietrzu w warunkach spawania pod wodą. Przeprowadzono analizę budowy strukturalnej oraz rozkładów twardości złączy spawanych. Stwierdzono, że zastosowany materiał dodatkowy umożliwia poprawne wykonanie złączy spawanych w warunkach...
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Two-Rate Based Low-Complexity Variable Fractional-Delay FIR Filter Structures
PublicationThis paper considers two-rate based structures for variable fractional-delay (VFD) finite-length impulse response (FIR) filters. They are single-rate structures but derived through a two-rate approach. The basic structure considered hitherto utilizes a regular half-band (HB) linear-phase filter and the Farrow structure with linear-phase subfilters. Especially for wide-band specifications, this structure is computationally efficient...
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Opinia dotycząca projektu konserwacji i rekonstrukcji grodziska w Tumie pod Łęczycą
PublicationOpinia wykonana przez rzeczoznawcę SKZ na zamówienie Narodowego Instytutu Dziedzictwa
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Economic growth and role of medium and low tech industries versus high tech industries
PublicationRozdział w monografii stanowiący kompleksową analizę wpływu oraz roli sektora niskich oraz średnich technologii we wzroście gospodarczym. Rola tych 2 sektorów jest przeciwstawiona roli sektora wysokich technologii we wzroście gospodarczym. Autorzy przeprowadzają analizę dla krajów OECD.
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Combustion of low calorific fuel at room and high temperature and at different oxygen content in the oxidizer
PublicationPraca przedstawia wyniki badań spalania paliwa niskokalorycznego powstałego w wyniku gazyfikacji biomasy. Badania prowadzono w temperaturze pokojowej oraz w warunkach typowych dla technologii HiTAC, tj. w temperaturze powyżej samozapłonu paliwa i przy różnej zawartości tlenu w utleniaczu. Wykazano możliwość wykorzystania technologii HiTAC do spalania takich paliw.
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Iniekcje cementowe pod podstawami pali wierconych w zastosowaniu do obiektów mostowych.
PublicationOmówiono założenia teoretyczne, przedstawiono metody oraz przedstawiono przykłady zastosowań iniekcji cementowych pod podstawami pali wierconych wykonanych pod posadowienie obiektów mostowych.
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Nonlinear generation of non-acoustic modes by low-frequency sound in a vibrationally relaxing gas
PublicationTwo dynamic equations referring to a weakly nonlinear and weakly dispersive flow of a gas in which molecular vibrational relaxation takes place. are derived. The first one governs an excess temperature associated with the thermal mode, and the second one describes variations in vibrational energy. Both quantities refer to non-wave types of gas motion. These variations are caused by the nonlinear transfer of acoustic energy into...
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Low frequency noise and reliability properties of 0.12um CMOS devices with Ta2O5 as gate dielectrics
PublicationW artykule przedstawiono wyniki badań jakości tranzystorów CMOS 0.12um z Ta2O5 użytym jako dielektryk bramki. Przedstawione są charakterystyki statyczne elementów oraz wyniki pomiarów szumów prowadzonych w celu określenia jakości warstwy dielektrycznej Ta2O5, a także wyniki badań przeciążeniowych elementów.
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Low-Loss Mechanically Tunable Resonator and Phase Shifters in Groove Gap Waveguide Technology
PublicationThis research is focused on the design and realization of high-performance high-power variable phase shifters in groove gap waveguide technology. Specifically, it is shown that the unique characteristic of groove gap waveguides, which is its proper operation without the need for electrical connection between the top and bottom sections of the waveguide, can be used to design mechanically tunable devices. Using the proposed method,...
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Electrical safety in low-voltage DC microgrids with B-type residual current devices
PublicationResidual current devices (RCDs) are most popular devices used in low-voltage installations for protection against electric shock and fire. In cases of high risk of electric shock the application of RCDs is mandatory. Currently, the spread of local direct current (DC) microgrids is widely considered. This creates new challenges for protective systems, in particular those based on RCDs. The main purpose of the research is to test...
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Microemulsion Delivery Systems with Low Surfactant Concentrations: Optimization of Structure and Properties by Glycol Cosurfactants
PublicationExtensive use of microemulsions as delivery systems raises interest in the safe ingredients that can form such systems. Here, we assessed the use of two glycols, i.e., propylene glycol and pentylene glycol, and their mixtures to manipulate the properties and structure of microemulsions. Obtained systems with glycols were extensively characterized in terms of capacity to incorporate water phase, droplet size, polydispersity, structure...
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An automated, low-latency environment for studying the neural basis of behavior in freely moving rats
PublicationBackground Behavior consists of the interaction between an organism and its environment, and is controlled by the brain. Brain activity varies at sub-second time scales, but behavioral measures are usually coarse (often consisting of only binary trial outcomes). Results To overcome this mismatch, we developed the Rat Interactive Foraging Facility (RIFF): a programmable interactive arena for freely moving rats with multiple feeding...
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Novel Tools for Comprehensive Functional Analysis of LDLR (Low-Density Lipoprotein Receptor) Variants
PublicationFamilial hypercholesterolemia (FH) is an autosomal-dominant disorder caused mainly by substitutions in the low-density lipoprotein receptor (LDLR) gene, leading to an increased risk of premature cardiovascular diseases. Tremendous advances in sequencing techniques have resulted in the discovery of more than 3000 variants of the LDLR gene, but not all of them are clinically relevant. Therefore, functional studies of selected variants...
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The In-House Method of Manufacturing a Low-Cost Heat Pipe with Specified Thermophysical Properties and Geometry
PublicationVarious types of heat pipes are available to purchase off the shelf, from various manufacturers, but most of them have strictly defined geometry and technical parameters. However, when there is a need to use a heat pipe (HP) with an unusual size and shape or working conditions other than the standard ones, it becomes very costly to order them from manufacturers, especially in small quantities, and only a few producers are willing...
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Methods of deep modification of low-bearing soil for the foundation of new and spare air runways
PublicationAfter analyzing the impact of aircraft on the airport pavement (parking spaces, runways, startways), it was considered advisable to consider the problem of deep improvement or strengthening of its subsoil. This is especially true for low-bearing soil. The paper presents a quick and effective method of strengthening the subsoil intended for the construction of engineering structures used for civil...
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Modeling of low calorific gas burning in a deficient oxygen environment and high-temperature oxidizer
PublicationThe experimental research will be performed using the experimental facility with a combustion chamber. The oxygen concentration in combustion oxidizers will be varied from 21% by volume (normal) air to 2%. The test combustion chamber will be fed with propane or methane as the reference fuel, then with low calorific fuels as test gases obtained by mixing various combustible components, e.g. H2, CH4, CO, and neutral gases, e.g. N2,...
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Effect of austempering temperature on microstructure and cyclic deformation behaviour of multiphase low-carbon steel
PublicationThis paper examined the cyclic deformation behaviour of multiphase low-carbon steel that was subjected to austempering heat treatments at four temperatures (190 °C, 230 °C, 275 °C, and 315 °C) below the martensite start temperature (Ms = 353 °C). The tests were conducted at room temperature, under fully reversed strain-controlled conditions, with strain amplitudes in the range 0.5–1.0%. The microstructure was observed by transmission...
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Monitoring działania wzmocnienia gruntu pod nasypem drogowym za pomocą sztywnych kolumn
PublicationOpis systemu pomiarowego zainstalowanego w kolumnach betonowych wzmacniających słabe podłoże gruntowe pod nasypem drogowym. Wstępne przedstawienie przykładowych wyników pomiarów. Problematyka niedokładności i odchyleń pomiarowych oraz sposób ich interpretacji.
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A Low-Cost System for Far-Field Non-Anechoic Measurements of Antenna Performance Figures
PublicationPrototype measurements are the key step in the development of antenna structures. Typically, their far-field characteristics are validated in expensive, dedicated facilities such as open range sites, or anechoic chambers. Despite being necessary for obtaining high-precision data (e.g., for device qualification), the use of costly infrastructure might not be fully justified when the main goal of measurements includes demonstration...
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Evaluation of RTKLIB's Positioning Accuracy Using low-cost GNSS Receiver and ASG-EUPOS
PublicationThe paper focuses on a comparison of different positioning methods provided by free and open source software (FOSS) package called RTKLIB. The RTKLIB supports real‐time and post‐processed positioning. The most important modes of operation tested by the authors are Kinematic, Static, Fixed and Precise Point Positioning (PPP). The data for evaluation were obtained from low‐cost Global Navigation Satellite System (GNSS) receiver....
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Wyładowanie mikrofalowe (915 MHz) dużej mocy w argonie pod ciśnieniem atmosferycznym
PublicationW niniejszym artykule przedstawiono wyniki pomiarów spektroskopowych wyładowania mikrofalowego w argonie pod ciśnieniem atmosferycznym. Badania przeprowadzono dla wyładowania mikrofalowego podtrzymywanego mikrofalami o częstotliwości 915 MHz w mikrofalowym aplikatorze plazmy typu rezonator wnękowy. Na podstawie uzyskanych wyników określono temperaturę wzbudzenia elektronowego, temperaturę cząstek ciężkich plazmy oraz koncentracje...
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Analysis of exhaled breath for dengue disease detection by low-cost electronic nose system
PublicationThis paper presents a procedure and a set-up of an electronic nose system analyzing exhaled breath to detect the patients suffering from dengue – a mosquito-borne tropical disease. Low-power resistive gas sensors (MiCS-6814, TGS8100) were used to detect volatile organic compounds (VOCs) in the exhaled breath. The end-tidal phase of patients exhaled breath was collected with a BioVOCTM breath sampler. Two strategies were assessed...
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Upgrading low value-added activities in global value chains: a functional specialisation approach
PublicationThis paper aims to identify patterns of functional specialisation (FS) in global value chains (GVCs) and determinants of upgrading them for selected Central Eastern European (CEE) economies. By combing the World Input-Output Database with data on occupations, we reveal a new FS pattern among subgroups of CEEs. Poland and Slovakia have an unfavourable GVC position and specialise in low value-added fabrication function. In contrast,...
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CNN Architectures for Human Pose Estimation from a Very Low Resolution Depth Image
PublicationThe paper is dedicated to proposing and evaluating a number of convolutional neural network architectures for calculating a multiple regression on 3D coordinates of human body joints tracked in a single low resolution depth image. The main challenge was to obtain a high precision in case of a noisy and coarse scan of the body, as observed by a depth sensor from a large distance. The regression network was expected to reason about...
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Badania i obliczenia sprawdzające zaworu p-poż. 1" PN16 firmy GRAS
PublicationWykonano obliczenia sprawdzające dla zaworu przy różnych wariantach obciążenia. Sformułowano wnioski.
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The forecasts-based instrument rule and decision making. How closely interlinked? The case of Sweden
PublicationResearch background: The Central Bank of Sweden declared in years 1999–2006 the implementation of the Svensson’s concept of inflation forecast targeting (IFT). It means that the repo rate decision-making process depends on the inflation forecasts. The concept evolved from the strict IFT with the decision-making algorithm called ‘the rule of thumb’ to the flexible IFT. Purpose of the article: The aim of...
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How much a geometrical model of a honeycomb seal can be simpli ed in the CFD calculation
PublicationThis paper presents the inuence of geometry simplication on the results obtained in the computational fluid dynamics simulation. The subject of simulation was part of the honeycomb seal located at the inlet to high pressure part of a steam turbine. There were three different geometrical models assumed in the calculations. First one was two-dimensional case and two others were three dimensional, one with the radius of curvature...
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Bis-phosphonated carbon nanotubes: one pot synthesis and their application as efficient adsorbent of mercury
PublicationEffective, one-pot method of CNTs phosphonylation is presented. Cheap and readily available reagents are used, so the process can be easily transferred to large-scale production. The product was analyzed using spectroscopic methods (FTIR, UV-vis, XPS). Thermal properties of the bis-phosphonated nanotubes are reported for the first time. Newly obtained material was tested as an adsorbent for mercury removal from water. The sorption...
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Uniform sampling in constrained domains for low-cost surrogate modeling of antenna input characteristics
PublicationIn this letter, a design of experiments technique that permits uniform sampling in constrained domains is proposed. The discussed method is applied to generate training data for construction of fast replacement models (surrogates) of antenna input characteristics. The modeling process is design-oriented with the surrogate domain spanned by a set of reference designs optimized with respect to the performance figures and/or operating...
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Computed vibrational excitation ofCF4by low-energy electrons and positrons: Comparing calculations and experiments
PublicationQuantum calculations for the excitation of the asymmetric modes of the CF4 target gas, ν3 and ν4, by impact of low-energy electrons and positrons are carried out in the energy range around 1 eV and are compared with recent experimental findings. The similarities and differences between the two types of projectiles, and the two different modes, are analyzed and discussed vis à vis the present accord with the experimental results.
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Low-cost multi-objective design of compact microwave structures using domain patching
PublicationA good compromise between size and electrical performance is an important design consideration for compact microwave structures. Comprehensive information about size/performance trade-offs can be obtained through multi-objective optimization. Due to considerable electromagnetic (EM) cross-couplings in highly compressed layouts, the design process has to be conducted at the level of high-fidelity EM analysis which is computationally...
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A new viscoelastic method of calculation of low-temperature thermal stresses in asphalt layers of pavements
PublicationThe paper presents a new method of calculation of thermal stresses in asphalt layers of pavements induced by cooling or heating. The method, developed by the author, is based on the analytical solution for the linear viscoelastic Burgers model extended numerically for the case of asphalt layers whose rheological parameters are strongly dependent on temperature. The coefficient of thermal expansion and Poisson’s ratio may optionally...
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Prototype design and development of low-load-roof photovoltaic modules for applications in on-grid systems
PublicationFour prototypes of lightweight photovoltaic modules for applications in on-grid systems have been designed, developed, manufactured and tested for compliance with relevant IEC standards. Selected, commercially available materials characterized by thermogravimetry, differential scanning calorimetry, dilatometry, scanning electron microscopy and nanoindentation technique were used in frameless, adhesively-bonded sandwich-structures...
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Sewage sludge pretreatment by low thermal disintegration for better efficacy of sludge digestion process
PublicationThe wastewater water treatment plant (WWTP) sector and it is developing technologies strive to be implement circular economy. The methane production from the sludge digestion process constitute promising source of the renewable energy for WWTP and approaching circular economy assumptions. For this reason, the objective of the study was to examine the modification of sludge characteristics due to the low temperature pretreatment....
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The influence of the carbon equivalent on the weldability of high-strength low-alloy steel in the water environment
PublicationFrom many years, the high strength low alloy steels are often used for offshore constructions. This constructions, due to the environment in which they work, require more frequent repairs than the constructions from the land. For economic reasons, repairs take place in the underwater conditions, however water significantly decreases the weldability of steel. The paper presents the results of the CTS weldability test for S460ML...
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The Dilemmas of Choosing a Suitable Technology for Low Energy and Passive Houses in the Context of their Overheating Issues
PublicationIn compliance with European Union directives, numerous countries are introducing increasingly stricter legal limits on the estimated energy consumption of newly designed residential buildings. However, the fact, that regulations and designers' efforts are focused on decreasing energy consumption (and consequently carbon dioxide emissions) only at the post-occupancy stage, may lead to a significant increase in the carbon footprint...
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Speed observer of induction machine based on backstepping and sliding mode for low‐speed operation
PublicationThis paper presents a speed observer design based on backstepping and slidingmode approaches. The inputs to the observer are the stator current and thevoltage vector components. This observer structure is extended to the integra-tors. The observer stabilizing functions contain the appropriate sliding surfaceswhich result from the Lyapunov function. The rotor angular speed is obtainedfrom the non‐adaptive formula with a sliding...
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Waste tire rubber as low-cost and environmentally-friendly modifier in thermoset polymers – a review
PublicationNowadays, waste tire rubber (WTR) management is a growing and serious problem. Therefore, research works focused on the development of cost-effective and environmentally-friendly methods of WTR recycling are fully justified. Incorporation of WTR into polymer matrices and composite materials attracts much attention, because this approach allows sustainable development of industrially applicable waste tires recycling technologies....
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Analytical procedures for short chain chlorinated paraffins determination - How to make them greener?
PublicationThe aim of the following paper was to gather current scientific information about the analytical protocols dedicated to measuring the content level of short-chain chlorinated paraffins (SCCPs) in various types of environmental samples. Moreover, the data about the basic validation parameters of applied procedures for SCCPs determination are listed. The main issue which is highlighted in the paper is the possibility of the application...
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Domain segmentation for low-cost surrogate-assisted multi-objective design optimisation of antennas
PublicationAbstract: Information regarding the best possible design trade-offs of an antenna structure can be obtained through multiobjective optimisation (MO). Unfortunately, MO is extremely challenging if full-wave electromagnetic (EM) simulation models are used for performance evaluation. Yet, for the majority of contemporary antennas, EM analysis is the only tool that ensures reliability. This study introduces a procedure for accelerated...
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Enhancement of fiber-optic low-coherence Fabry-Pérot interferometer with ZnO ALD films
PublicationIn this paper investigation of the enhanced fiber-optic low coherence Fabry-Pérot interferometer with zinc oxide (ZnO) film deposited by atomic layer deposition (ALD) was presented. Model of the interferometer, which was constructed of single-mode optical fiber with applied ZnO ALD films, was built. The interferometer was also examined by means of experiment. Measurements were performed for both reflective and transmission modes,...
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Design and optimization of a novel miniaturized low-profile circularly polarized wide-slot antenna
PublicationThis paper presents a novel structure of a compact circularly polarized (CP) antenna. CP is obtained using a parasitic quasi-rectangular strip placed coplanar to the feedline. A ground plane perturbation combined with the asymmetric geometry of the coplanar waveguide ground planes is utilized to excite additional CP modes. All antenna dimensions are rigorously optimized to achieve the best possible performance in terms of the impedance...