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Search results for: finnish studies
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Application of ecotoxicological studies in integrated environmental monitoring: possibilities and problems
PublicationPodstawowym celem badań stanu środowiska i procesów w nim zachodzących jest oszacowanie wpływu różnego typu zanieczyszczeń na organizmy żywe, w tym także na organizm człowieka. Jeszcze do niedawna do oceny ryzyka środowiskowego wykorzystywano wyniki uzyskane w trakcie badań analitycznych z wykorzystaniem typowych metod chemicznych i fizykochemicznych. Niestety, miały one charakter badań rutynowych i ograniczały się do oznaczania...
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Over-Voltage Studies in Inverter Fed Induction Motor Drives
PublicationW pracy przedstawiono metodę identyfikacji pojemności pasożytniczych uzwojeń silników asynchronicznych uwzględniającą ich rozłożony charakter. Przedstawiony szerokopasmowy model obwodowy uzwojeń silnika asynchronicznego pozwala na modelowanie zjawisk przepięciowych w silnikach asynchronicznych, w szczególności zasilanych poprzez przekształtniki energoelektroniczne. Zaproponowana metoda analizy umożliwia również określanie składowych...
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Synthesis and structure-activity studies of peptide-acridine/acridone conjugates
PublicationW artykule opisano strukturę, syntezę i biologiczną aktywność peptydowych koniugatów akrydyny i akrydonu jako potencjalnych leków o aktywności przeciwnowotworowej i przeciwwirusowej.
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Conformational studies of neurohypophyseal hormones analogues with glycoconjugates by NMR spectroscopy
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Pedestrian safety in road traffic – studies, recommendations and proposed improvements
PublicationPedestrians are involved and most frequently the victims of every third road accident in Poland. Pedestrian accidents most frequently occur in complex circumstances, as a result of many factors related to the behaviour of drivers and pedestrians. The basic parameters that determine road safety include the perception of traffic and visibility on the road. The paper will present the results of research conducted within the project...
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Selected studies of flow maldistribution in a minichannel plate heat exchanger
PublicationAnalysis of the state of-the-art in research of minichannel heat exchangers, especially on the topic of flow maldistribution in multiple channels, has been accomplished. Studies on minichannel plate heat exchanger with 51 parallel minichannels with four hydraulic diameters, i.e., 461 μm, 574 μm, 667 μm, and 750 μm have been presented. Flow at the instance of filling the microchannel with water at low flow rates has been visualized. The...
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The Influence of Storage on Human Milk Lipidome Stability for Lipidomic Studies
PublicationHuman milk (HM) lipidome stability during storage is crucial in lipidomic studies to avoid misinterpretations. Facing the lack of comprehensive work on the HM lipidome stability, we performed a study on a potential alteration in the lipid profiles of HM samples stored under different conditions. An untargeted LC-Q-TOF-MS-based approach was applied to study the influence of storage conditions as well as the interaction of the storage...
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High-accuracy polarimetric studies on lead germanate single crystals
PublicationA high-accuracy polarimetric technique has been used for the characterization of a lead germanate ferroelectric single crystal. The measurement results of the linear and circular birefringence in the [010] direction at a wavelength of 633 nm under the influence of an electric field are presented. Gyration–electric field hysteresis loops at alternative crystal positions in the polarization system have been used to determine the...
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Theoretical studies of fragmentation processes of neutral and ionized furan molecule
PublicationThis PhD thesis focuses on the fragmentation mechanism of the furan molecule in the gas phase. The approach taken in this work comprised of three theoretical methodologies considering the dynamical, energetical and entropic aspects of the studied process. First, molecular dynamics simulations were performed. Next, the potential energy surfaces were explored at the DFT/B3LYP level of theory. Finally, a new statistical Microcanonical...
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Child-Robot Interaction Studies During COVID-19 Pandemic
PublicationThe coronavirus disease (COVID-19) pandemic affected our lives deeply, just like everyone else, the children also suffered from the restrictions due to COVID-19 affecting their education and social interactions with others, being restricted from play areas and schools for a long time. Although social robots provide a promising solution to support children in their education, healthcare, and social interaction with others, the precautions...
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Flood Security Strategy - Case Studies from Gdańsk Region
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Positron Annihilation Studies of Silicon Oxides and Oxygen Precipitates in Silicon
PublicationTechniki pozytonowe dają możliwości badania defektów i zmian strukturalnych nie obserwowanych innymi metodami. W tej pracy zastosowano 3 różne techniki pozytonowe do badania zmian strukturalnych i tworzenia wydzieleń SiOx w krzemie.
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Theoretical Auger and photoionization studies for open shell atoms andions.
PublicationWykorzystano program komputerowy RATIP do badań własności atomów i jonów o dowolnej konfiguracji. Położono nacisk na obliczenia szeregu własności elektronów Augera i fotojonizacji, aby dokonać porównań z ostatnio wykonywanymi doświadczeniami.
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Structural studies of bismuth nanocrystals embedded in SiO2 or GeO2 matrices.
PublicationW wyniku wygrzewania w atmosferze wodoru szkieł bizmutowych i germanowych otrzymano warstwę nanogranul bizmutu w otoczeniu amorficznej matrycy oraz powierzchniową warstwę bizmutowych granul. Grubość i struktura tak otrzymanych warstw silnie zależy od czasu i temperatury redukcji.
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Time-frequency characteristics of chemical oscillations. Experimental and model studies.
PublicationW publikacji zaprezentowano wykorzystanie czasowo-częstotliwościowych metod analizy sygnałów niestacjonarnych do badania reakcji Biełousowa-Żabotyńskiego. Zastosowanie krótkoczasowej transformaty Fouriera (STFT) pozwoliło na uzyskanie spektrogramów przedstawiających zmiany energii i częstotliwości oscylacji w trakcie trwania reakcji chemicznej. Przedyskutowano podobieństwa i różnice pomiędzy spektrogramami wygenerowanych dla eksperymentalnych...
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Computational studies of friction forces for hard tissue cultivation in bioreactor.
PublicationPonieważ wymiana naturalego stawu na endoprotezę może być dokonywana 2-3 razy w życiu, problem leczenia przez transplantację tkanek chrzęstnych nabiera dużego znaczenia. Przeszczepów tkanki można dokonywać z sukcesem wiele razy. W bioreaktorach, środowisko hydrodynamiczne kształtuje hodowlę tkanek in vitro w obecności sił tarcia, poprzez bezpośrednie działanie na morfologię komórek a także poprzez pośrednie działanie na tkankę...
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Studies of the separation performance of silanized silica gel for simulated distillation
PublicationWe present the results of investigations of the chromatographic (sorptive) properties of silanized silica gel as a stationary phase for gas chromatography used for simulated distillation. Commercially available silanized sorbent (particle diameter range 63–200 m, average pore size 60 Å) was sieved to obtain the 80–100 mesh fraction (180–150 m). The obtained results revealed that silanized silica gel allows the complete separation...
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Ionophores in polymeric membranes for selective ion recognition; impedance studies
PublicationBadania impedancyjne membran zawierających jonofory selektywne na kation Na+ (L1) i Cs+(L2) wykazały, ze stala dielektryczna materiału membrany zależy od typu uzytego plastyfikatora i zmienia się w zakresie od 28 do 60. Rezystancja membran zawierających ligand L1 i L2 wynosi 0.15 -1.4 Mohm w zależności od stężenia elektrolitu zewnnetrznego. Testowona dwa typy elektrod jonoselektywnych: elektrody typu ASS z polimerem przewodzącym...
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Impedance Studies of Phosphate-iron Glasses Containing Niobium and Titanium
PublicationThe ac and dc conductivity in phosphate-iron-niobate glasses with addition of titanium oxide was investigated as a function of temperature and frequency with the use of impedance spectroscopy. The topography and microstructure of glasses were investigated by the means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and confocal microscopy methods. The obtained results show that all samples are amorphous but they...
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Hydration of amino acids: FTIR spectra and molecular dynamics studies
PublicationThe hydration of selected amino acids, alanine, glycine, proline, valine, isoleucine and phenylalanine, has been studied in aqueous solutions by means of FTIR spectra of HDO isotopically diluted in H2O. The difference spectra procedure and the chemometric method have been applied to remove the contribution of bulk water and thus to separate the spectra of solute-affected HDO. To support interpretation of obtained spectral results,...
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Preliminary studies on the effect of feed speed on the colour change of wood
PublicationThis paper presents the results of preliminary analyses of the effect of cutting parameters on changes in the colour of wood. Beech wood cut with use circular saw was analysed. The cutting parameter tested was the feed speed, represented by the feed per tooth. Sawing processes with different feed per tooth ranging from 0.0008 mm to 0.09 mm were analysed. It was observed that over the entire range of feed rate per tooth analysed,...
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Dielectric Spectroscopy Studies and Modelling of Piezoelectric Properties of Multiferroic Ceramics
PublicationCompounds and solid solutions of bismuth ferrite (BiFeO3)—barium titanate (BaTiO3) system are of great scientific and engineering interest as multiferroic and potential high-temperature lead-free piezoelectric materials. In the present paper, the results of research on the synthesis and characterisation of 0.67Bi1.02FeO3–0.33BaTiO3 (67BFBT) ceramics in terms of crystal structure and dielectric and piezoelectric properties are reported....
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Blood Pressure - Pulse Transit Time Relationships: Comparative Studies
PublicationA non-invasive and continuous blood pressure estimation could allow a better diagnosis and an earlier detection of various diseases. It could be performed using a photoplethysmography. However, it requires that a relation between blood pressure and pulse transit time is known. Eleven theoretical formulas were used in obtaining the simulated and noise free synthetic data. Then, they were utilized in validation of three, commonly...
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Experimental and theoretical studies of resonance effects during silo flow.
PublicationPrzedstawiono badania nad rezonansowymi efektami dynamicznymi podczas przepływów silosowych. Wpływ rezonansu na wielkość naporu był analizowany przy pomocy badań doświadczalnych i obliczeń MES na bazie prawa mikropolarnego sprężysto-plastycznego. Doświadczenia wykonano w silosie o przekroju okrągłym i prostokątnym. Zaproponowano efektywną metodę redukcji efektów dynamicznych.
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Formulation, characterisation and in vitro studies of doxorubicin-loaded silica–polydimethylsiloxane granules
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Remote Estimation of Video-Based Vital Signs in Emotion Invocation Studies
PublicationAbstract— The goal of this study is to examine the influence of various imitated and video invoked emotions on the vital signs (respiratory and pulse rates). We also perform an analysis of the possibility to extract signals from sequences acquired with cost-effective cameras. The preliminary results show that the respiratory rate allows for better separation of some emotions than the pulse rate, yet this relation highly depends...
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Voltammetric and biological studies of folate-targeted non-lamellar lipid mesophases
PublicationFolate-targeted lipid nanostructures are promising strategies for the development of biocompatible drug delivery systems. The objective of this study was to evaluate the efficacy of drug delivery to cancer cells by folate-targeted lipid mesophases, cubosomes (CUB) and hexosomes (HEX), loaded with doxorubicin (DOX). Three cancer-derived cell lines (KB, HeLa, T98G) exhibiting different expressional levels of folate receptor protein...
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Histaminol and Its Complexes with Copper(II) - Studies in Solid State and Solution
PublicationHistaminol [4(5)-(B-hydroxyethyl)imidazole, 4-(1H-imidazol-2-yl)ethanol, L] is an analogue of histamine and its minor metabolite. So far its properties have not been studied in detail due to the synthetic difficulties. Here, the structure and acid-base properties of histaminol, as well as the results of studies on its copper(II) complexes in solid state and aqueous solution are reported. Stability constants of the histaminol–CuII...
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Preliminary studies of the chemical composition and cytotoxic activity of Hottonia palustris herb
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Preliminary Studies on a Lightweight Porous Cement-Based Composite – Gel Concrete
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Acetylcholinesterase inhibitors: structure-activity relationship and kinetic studies on selected flavonoids
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DSC and electrophoretic studies on protein denaturation of Anodonta woodiana (Lea, 1834)
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Analysis of the Impact Resistance of Toecaps by the Finite Element Method: Preliminary Studies
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Pilot plant studies on the removal of trihalomethanes by composite reverse osmosis membranes
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Comparative studies on OSL properties of LiMgPO4:Tb,B powders and crystals
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Spectroscopic studies of UV-irradiated poly(vinyl alcohol)/elastin blends
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The process of developing dynamic capabilities: The conceptualization attempt and the results of empirical studies
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Collusion and bid rigging in the construction industry: case studies from Poland
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Star Polymers vs. Dendrimers: Studies of the Synthesis Based on Computer Simulations
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Ab initio and nuclear inelastic scattering studies of Fe3Si/GaAs heterostructures
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Studies on the separation of some transition metals using trialkylimidazole as selective extractant
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The surge of Japanese studies supporting the use of angiotensin receptor blockers in hypertension
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Kinetic studies of complexation reaction of polyoxaalkyl phosphates with Fe(III) in ethanol
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Studies of Streptococcus anginosus Virulence in Dictyostelium discoideum and Galleria mellonella Models
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Studies of complexation of metal cations by tris(3,6-dioxaheptyl)amine in solution
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Potentiometric and AM1d studies of silicon and phosphorous podands-silver (I) complexes
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Potentiometric and AM1d studies of silicon and boron podands—silver (I) complexes
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Hybrid carbon-TiO2 spheres: Investigation of structure, morphology and spectroscopic studies
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Microwave-assisted hydrothermal synthesis and electrochemical studies of α- and h-MoO3
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Studies of Nonlinear Sound Dynamics in Fluids Based on the Caloric Equation of State
PublicationThe sound speed and parameters of nonlinearity B/A, C/A in a fluid are expressed in terms of coefficients in the Taylor series expansion of an excess internal energy, in powers of excess pressure and density. That allows to conclude about features of the sound propagation in fluids, the internal energy of which is known as a function of pressure and density. The sound speed and parameters of nonlinearity in the mixture consisting...