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Search results for: coarse-graining
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Influence of material properties of charge on electrical parameters of induction heating setup
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Video component of a computer system to supervise of charge position by induction heating
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The stand for determining of thermal‐electrical material properties of induction heated charge
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Laboratory Investigations of Frost Susceptibility of Aggregates Applied to Road Base Courses
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Efficient list cost coloring of vertices and/or edges of some sparse graphs
PublicationRozważane jest kolorowanie wierzchołków i krawędzi grafów w modelach klasycznym, totalnym i pseudototalnym z uwzględnieniem dodatkowego ograniczenia w postaci list dostępnych kolorów. Proponujemy wielomianowy algorytm oparty na paradygmacie programowania dynamicznego dla grafów o strukturze drzewa. Wynik ten można uogólnić na grafy o liczbie cyklomatycznej ograniczonej z góry przez dowolnie wybraną stała.
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Coexistence of dissociation and annihilation of excitons on charge carriers in organic phosphorescent emitters
PublicationW pracy badano elektrycznopolową dysocjację ekscytonów i wygaszanie ekscytonów na nośnikach ładunku elektrycznego w organicznym kompleksie irydu (III), umieszczonego w matrycy poliwęglan : dwuamina TPD. Proces dysocjacji ekscytonów jest zgodny z trójwymiarowym modelem Onsagera. Analiza ilościowa wygaszenia ładunkowego fotoluminescencji pozwoliła wyznaczyć stałe oddziaływania ekscyton - ładunek elektryczny.
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Charge photogeneration effect on the exciplex emission from thin organic films
PublicationZaobserwowano silne wygaszenie fluorescencji i fosforescencji ekscypleksowej w układzie dwuamina TPD (donor elektronu): pochodna fenantroliny BPT (akceptor elektronu) w zewnętrznym polu elektrycznym. Efekt ten przypisano wygaszaniu molekularnych ekscytonów singletowych TPD na elektronach akceptorów BPT.
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Ab initio molecular treatment for charge transfer by S3+ ion on hydrogen.
PublicationPoliczono adiabatyczne potencjały oddziaływania między jonem siarki i wodoru. Dokonano obliczeń nieadiabatycznych sprzężeń pomiędzy tymi potencjałami. Obliczenia wykazały, że należy wziąć pod uwagę niezbadany wcześniej poziom energetyczny jonu siarki aby dokładnie wyjaśnić mechanizm przechwytu ładunku.
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Dependence of the charge carries photogeneration yield on the bimolecular recombination in tetracene layers
PublicationBadano mechanizmy generacji nośników ładunku dwóch znaków w warstwie tetracenu. Rezultaty pomiarów doświadczalnych oraz prowadzona analiza wykazały, że rekombinacja wpływa znacząco na produkcję nośników ujemnych.
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Distance learning trends: introducing new solutions to data analysis courses
PublicationNowadays data analysis of any kind becomes a piece of art. The same happens with the teaching processes of statistics, econometrics and other related courses. This is not only because we are facing (and are forced to) teach online or in a hybrid mode. Students expect to see not only the theoretical part of the study and solve some practical examples together with the instructor. They are waiting to see a variety of tools, tutorials,...
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Estimation of the amplitude of the signal for the active optical gesture sensor with sparse detectors
PublicationIn this paper we deal with the problem of precise gesture recognition for the active optical proximity sensor with sparse 8 photodiodes. We particularly focus on developing the method of estimating the real, usually not observable, maximum signal value representing maximum intensity of light reflected from an obstacle present in the front of the sensor. Different configurations of the fingers were used as an obstacle. The Monte Carlo...
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Data Compression in Ultrasonic Network Communication via Sparse Signal Processing
PublicationThis document presents the approach of using compressed sensing in signal encoding and information transferring within a guided wave sensor network, comprised of specially designed frequency steerable acoustic transducers (FSATs). Wave propagation in a damaged plate was simulated using commercial FEM-based software COMSOL. Guided waves were excited by means of FSATs, characterized by the special shape of its electrodes, and modeled...
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Exposure of a small Arctic seabird, the little auk (Alle alle) breeding in Svalbard, to selected elements throughout the course of a year
PublicationThe Arctic marine ecosystem can be altered by processes of natural and anthropogenic origin. Spatio-temporal variation in species exposure to contamination is still poorly understood. Here, we studied elemental concentrations in the non-lethally collected samples from the most numerous seabird in European Arctic, the little auk (Alle alle) nesting in one breeding colony in Svalbard. This seabird spent the breeding season in the...
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Enrichment and distribution of trace elements in Padhrar, Thar and Kotli coals from Pakistan: Comparison to coals from China with an emphasis on the elements distribution
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Implementation of Molecular Dynamics and Its Extensions with the Coarse-Grained UNRES Force Field on Massively Parallel Systems: Toward Millisecond-Scale Simulations of Protein Structure, Dynamics, and Thermodynamics
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Limiting futile therapy as part of end-of-life care in intensive care units
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Maritime heritage of small port towns of the Polish coast
PublicationThe article describes problems of the gradual disappearance of real maritime heritage in small Polish port cities. The maritime heritage of small port cities was shaped by coastal processes and urban historical conditions what has led to creation of specific types of landscapes. Special architectural objects of the post-port heritage of small ports of the Polish coast are hydrotechnical constructions (i.e. breakwaters, quays),...
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Anisakids of seals found on the southern coast of Baltic Sea
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Index filtrations and Morse decompositions for discrete dynamical systems
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The influence of cultural factors on the collapse of the Greenland Norse civilization
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Index filtrations and Morse decomposition for discrete dynamical systems
PublicationOn a Morse decomposition of an isolated invariant set of a homeomorphism(discrete dynamical system) there are partial orderings defined by the homeomorphism.These are called admissible orderings of the...
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Morse cohomology in a Hilbert space via the Conley index
PublicationThe main theorem of this paper states that Morse cohomology groups in a Hilbert space are isomorphic to the cohomological Conley index. It is also shown that calculating the cohomological Conley index does not require finite-dimensional approximations of the vector field. Further directions are discussed.
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Computer-Supported Polysensory Integration Technology for Educationally Handicapped Pupils
PublicationIn this paper, a multimedia system providing technology for hearing and visual attention stimulation is shortly presented. The system aims to support the development of educationally handicapped pupils. The system has been presented in the context of its configuration, architecture, and therapeutic exercise implementation issues. Results of pupils’ improvements after 8 weeks of training with the system are also provided. Training...
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Towards temperature-dependent coarse-grained potentials of side-chain interactions for protein folding simulations. I: Molecular dynamics study of a pair of methane molecules in water at various temperatures
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Pharmaceutical care in the neonatal intensive care unit: Perspectives of Polish medical and pharmacy students
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The role of stakeholders on rejection of bankruptcy applications in the case of “poverty” of the estate: A Polish case study
PublicationThe aim of this article is to supplement the Law and Economics area of science with regard to the scope of the ex ante effectiveness of bankruptcy law using the example of Poland. Bankruptcy law is effective in the ex ante stage when it eliminates from the market insolvent entrepreneurs who cannot even afford to cover the costs of bankruptcy proceedings. In these cases, the bankruptcy court should dismiss the petition for bankruptcy...
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Effects of Renal Sympathetic Denervation on Blood Pressure, Sleep Apnea Course, and Glycemic Control in Patients With Resistant Hypertension and Sleep Apnea
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Blast Charge Technique as a Method of Soil Improving to Locate the New Supporting Runways
PublicationA quick and effective method of reinforcing the ground base designed for the construction of engineering structures used for performing various types of air operations was presented. It allows to use wastelands, wetlands, swamps, etc. for these purposes, thus creating a dispersed network of landing sites, increasing the access of large social groups to air transport and increasing their mobility.
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Modeling of Transient Photocurrent in Organic Semiconductors Incorporating the Annihilation of Excitons on Charge Carriers
PublicationThe role of the annihilation of excitons on charge carriers has been theoretically investigated in organic semiconductors. We have developed the numerical drift-diffusion model by incorporation terms which describe the annihilation process. The transient photocurrent has been calculated for different injection barrier heights, exciton mobilities, and annihilation rate constants. We have demonstrated that the annihilation has a...
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Correlation between charge density waves and antiferromagnetism in Nd1−xGdxNiC2 solid solutions
PublicationWe report a study on the evolution of a charge density wave and antiferromagnetism in the series of the polycrystalline solid solution Nd1−xGdxNiC2 (0 _ x _ 1) by means of magnetic and transport properties measurements. The experimental results reveal the violation of the de Gennes law and a strong correlation between the Peierls, Néel, and Curie-Weiss temperatures, which strongly suggests a cooperative interaction between the...
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Model-Based Decision Support System for the Blast Furnace Charge of Burden Materials
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Increasing the conductivity of V2O5 -TeO2 glass by crystallization: structure and charge transfer studies
PublicationIn the present paper, V2O5-TeO2 glass...
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Isotropic s -wave superconductivity in the noncentrosymmetric charge density wave superconductor SrPt2As2
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Improvement of charge separation in TiO 2 by its modification with different tungsten compounds
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Interfacial Charge Transfer Complexes in TiO2-Enediol Hybrids Synthesized by Sol–Gel
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Electroabsorption study of metal-to-ligand charge transfer in an organic complex of iridium (III).
PublicationW pracy zmierzono i zinterpretowano widmo elektroabsorpcji (EA) próżniowo naparowanych warstw organicznego kompleksu Ir(ppy)3, powszechnie stosowanego jako emiter fosforescencyjny w organicznych diodach elektroluminescencyjnych. Analiza widma EA potwierdziła fakt,że niskoenergetyczne stany elektronowe tego kompleksu związane są z przeniesieniem ładunku metal-ligand.
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Distance Education Centre at Gdansk University of Technology - international project and courses online.
PublicationPrzedstawiono programy Unii Europejskiej (Phare, Leonardo da Vinci,Socrates) wspomagające m.in. utworzenie Centrum Edukacji Niestacjonarnej PG oraz realizację szkoleń na odległość. Opisano przykładowe szkolenia z wykorzystaniem Internetu, które znajdują się w ofercie CEN PG.
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Searching for evaluation procedures for Web based courses - cases from EU projects
PublicationCentrum Edukacji Niestacjonarnej Politechniki Gdańskiej realizuje projekty Unii Europejskiej od 1997 roku. Większość projektów była ukierunkowana na dostarczanie kursów internetowych. Jednak nie wszystkie powstałe kursy mogą być wykorzystane jako dobrej jakości, gotowy do wprowadzenia produkt. W artykule, na bazie doświadczeń nabytych podczas realizacji projektów Leonardo da Vinci (1998-2004), przedstawiono ocenę jakości i osiągniętej...
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BINDER COURSES USING COLD RECYCLED MIXTURES – A NOVEL CONCEPT IN COLD RECYCLING
PublicationCold recycling with cement and bituminous emulsion is one of the most environmentally friendly techniques to maximize the reuse of reclaimed asphalt (RA) collected during demolition of roads. Cold recycled mixtures are commonly used for base courses in construction or rehabilitation of flexible and semi-rigid pavements. Current experiences demonstrated that cold recycling with appropriate requirements and technical recommendations...
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Inception and Propagation of Electrical Trees in the Presence of Space Charge in HVAC Extruded Cables
PublicationThis paper presents the space charge impact on the inception and propagation of electrical trees in cross-linked polyethylene (XLPE) insulation via simulations and experimentation. A 3D finite element analysis (FEA)-based modeling is proposed to simulate electrical trees via a needle embedded on the XLPE insulation. The proposed FEA model demonstrates the influence of the space charge magnitude and polarity on the initiation of...
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Innovative Bidirectional Isolated High-Power Density On-Board Charge for Vehicle-to-Grid
PublicationThis paper deals with developing and implementing a bidirectional galvanically isolated on-board charger of a high-power density. The power density of the new charger was 4 kW/kg and 2.46 kW/dm3, and the maximum efficiency was 96.4% at 3.4 kW. Due to the requirement to achieve a high-power density, a single-stage inverter topology was used. Regarding switching losses, due to the topology of the circuit with so-called hard switching,...
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Elimination of clicks from archive speech signals using sparse autoregressive modeling
PublicationThis paper presents a new approach to elimination of impulsivedisturbances from archive speech signals. The proposedsparse autoregressive (SAR) signal representation is given ina factorized form - the model is a cascade of the so-called formantfilter and pitch filter. Such a technique has been widelyused in code-excited linear prediction (CELP) systems, as itguarantees model stability. After detection of noise pulses usinglinear...
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RENOVATION OF ARCHIVE AUDIO RECORDINGS USING SPARSE AUTOREGRESSIVE MODELING AND BIDIRECTIONAL PROCESSING
PublicationThe paper presents a new approach to elimination of broadband noise and impulsive disturbances from archive audio recordings. The proposed adaptive Kalman-like algorithm, based on a sparse autoregressive model of the audio signal, simultaneously detects noise pulses, interpolates the irrevocably distorted samples and performs signal smoothing. It is shown that bidirectional (forward-backward) processing of the archive signal improves...
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A Task-Scheduling Approach for Efficient Sparse Symmetric Matrix-Vector Multiplication on a GPU
PublicationIn this paper, a task-scheduling approach to efficiently calculating sparse symmetric matrix-vector products and designed to run on Graphics Processing Units (GPUs) is presented. The main premise is that, for many sparse symmetric matrices occurring in common applications, it is possible to obtain significant reductions in memory usage and improvements in performance when the matrix is prepared in certain ways prior to computation....
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Design and Application of Magnetic Photocatalysts for Water Treatment. The Effect of Particle Charge on Surface
PublicationCore-interlayer-shell Fe3O4/SiO2/TiO2, CoFe2O4/SiO2/TiO2 and BaFe12O19/SiO2/TiO2 magnetic photocatalysts were obtained. A water-in-oil microemulsion system with suitable surfactants was used for functionalization of the magnetic core with silica interlayer and TiO2-based photocatalyst. Uncoated and coated particles were characterized by electrophoretic meaurements, X-ray diffractometry (XRD), scanning electron microscopy (SEM),...
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Influence of excitons interaction with charge carriers on photovoltaic parameters in organic solar cells
PublicationWe report on theoretical analysis of excitons annihilation on charge carriers in organic solar cells. Numerical calculations based on transient one-dimensional drift-diffusion model have been carried out. An impact of three quantities (an annihilation rate constant, an exciton mobility and a recombination reduction factor) on current density and concentrations of charge carriers and excitons is investigated. Finally, we discuss...
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Lanthanide ions (Eu3+, Er3+, Pr3+) as luminescence and charge carrier centers in Sr2TiO4
PublicationA series of strontium orthotitanate (Sr2TiO4) samples doped with 2% of a mole of europium, praseodymium, and erbium were obtained using the solid-state synthesis method. The X-ray diffraction (XRD) technique confirms the phase purity of all samples and the lack of the influence of dopants at a given concentration on the structure of materials. The optical properties indicate, in the case of Sr2TiO4:Eu3+, two independent emission...
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UK travel agents’ evaluation of eLearning courses offered by destinations: an exploratory study.
PublicationThis study aims to develop an understanding of the use of e-learning courses created for travel agents by Destination Management Organizations (DMOs). It explores agents’ perceptions of such courses. The research examines the views of 304 UK-based travel agents using online survey and investigates whether age, sex, type of agency, work experience, and educational level have influence on e-learning uptake. The satisfaction of travel...
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Increasing the conductivity of V2O5-TeO2 glass by crystallization: structure and charge transfer studies
PublicationIn the present paper, V 2 O 5 -TeO 2 glass was prepared by the melt-quenching technique. Crystallization of glass with a vanadium content higher than 35%mol results in an increase in electrical conductivity by a few orders of magnitude and a decrease in activation energy from ~0.40 to ~0.12 eV. In this work, a critical review of existing charge transfer models was presented on the example of V 2 O 5 -TeO 2 glass and glass–ceramics....
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An Approach to Trust Case Development
PublicationIn the paper we present an approach to the architectural trust case development for DRIVE, the IT infrastructure supporting the processes of drugs distribution and application. The objectives of DRIVE included safer and cheaper drugs distribution and application. A trust case represents an argument supporting the trustworthiness of the system. It is decomposed into claims that postulate some trust related properties. Claims differ...