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Search results for: D.C. conductivity
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Chinese Physics C
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PHYSICAL REVIEW C
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Effect of Amino Acids and Sodium Chloride on d-Sorbitol in Aqueous Solutions at Different Temperatures: Volumetric and Acoustic Approach
PublicationApparent molar volumes and apparent molar compressibilities for d-sorbitol in (0.05, 0.1, 0.2 and 0.3) mol·kg−1 aqueous solutions of l-alanine, l-cysteine and l-histidine and NaCl have been determined from measurements of solution density at T = (288.15, 298.15, 308.15 and 318.15) K and sound velocity at T = 298.15 K, as a function of the concentration of the sugar alcohol. The data were used to obtain the limiting apparent molar...
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SEM images of symmetrical cell interface with SrTi0.30Fe0.70O3-d electrode and CGO-20 substrate in function of sintering temperature
Open Research DataThis dataset contains images of polished cross section of symmetrical cell interface with SrTi0.30Fe0.70O3-d electrode and CGO-20 substrate in function of sintering temperature (800 °C, 900°C and 1000 °C) . Images were obtained using a PhenomXL (Thermo Fisher Scientific, the Netherlands) scanning electron microscope (SEM) with an accelerating voltage...
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SEM images of symmetrical cell interface with SrTi0.65Fe0.35O3-d electrode and CGO-20 substrate in function of sintering temperature
Open Research DataThis dataset contains images of polished cross section of symmetrical cell interface with SrTi0.65Fe0.35O3-d electrode and CGO-20 substrate in function of sintering temperature (800 °C, 900°C and 1000 °C) . Images were obtained using a PhenomXL (Thermo Fisher Scientific, the Netherlands) scanning electron microscope (SEM) with an accelerating voltage...
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SEM images of symmetrical cell interface with SrTi0.50Fe0.50O3-d electrode and CGO-20 substrate in function of sintering temperature
Open Research DataThis dataset contains images of polished cross section of symmetrical cell interface with SrTi0.50Fe0.50O3-d electrode and CGO-20 substrate in function of sintering temperature (800 °C, 900°C and 1000 °C) . Images were obtained using a PhenomXL (Thermo Fisher Scientific, the Netherlands) scanning electron microscope (SEM) with an accelerating voltage...
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Potential degradation of norfloxacin using UV-C/Fe2+/peroxides-based oxidative pathways
PublicationThe removal of norfloxacin (NOR), a widely used pharmaceutical and emerging water pollutant, was studied using UV-C and Fe2+ catalyzed peroxides-based oxidative processes (e.g., UV-C/Fe2+/H2O2, UV-C/Fe2+/S2O82− and UV-C/Fe2+/HSO5−) and compared with UV-C and UV-C/Fe2+. The UV-C and UV-C/Fe2+ degraded NOR to 38 and 55 %. However, use of peroxides, i.e., H2O2, S2O82−, HSO5− with UV-C and UV-C/Fe2+ promoted NOR %degradation to 75,...
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Michał Tomasz Kucewicz dr
PeopleMichal Kucewicz was born in 1986 in Gdansk. In 2005 he completed International Baccalaureate programme in Topolowka (III High School in Gdańsk). Thanks to the G. D. Fahrenheit scholarship, he moved to the United Kingdom to study neuroscience. He received his Bachelor’s and Master’s degree from the Cambridge University, and his doctoral degree from the University of Bristol specializing in electrophysiology of memory and cognitive...
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Electrical Simulations of the SIS100 Superconducting Dipole and Quadrupole Circuits: Transients, Earthing and Failure Modes
PublicationThe 100 Tm superconducting synchrotron SIS100 is the main accelerator of the international Facility for Antiproton and Ion Research (FAIR) currently under advanced construction in Darmstadt, Germany. The SIS100 dipole circuit which creates the magnetic field required to bend the beam, consists of 108 dipoles distributed over six arc sections of the ring. The magnetic field for the beam focusing is generated by three individual...
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Analytical Expression for the Time-Domain Discrete Green's Function of a Plane Wave Propagating in the 2-D FDTD Grid
PublicationIn this letter, a new closed-form expression for the time-domain discrete Green's function (DGF) of a plane wave propagating in the 2-D finite-difference time-domain (FDTD) grid is derived. For the sake of its verification, the time-domain implementation of the analytic field propagator (AFP) technique was developed for the plane wave injection in 2-D total-field/scattered-field (TFSF) FDTD simulations. Such an implementation of...
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Analytical Expression for the Time-Domain Green's Function of a Discrete Plane Wave Propagating in the 3-D FDTD Grid
PublicationIn this paper, a closed-form expression for the time-domain dyadic Green’s function of a discrete plane wave (DPW) propagating in a 3-D finite-difference time-domain (FDTD) grid is derived. In order to verify our findings, the time-domain implementation of the DPW-injection technique is developed with the use of the derived expression for 3-D total-field/scattered-field (TFSF) FDTD simulations. This implementation requires computations...
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Geometrically Nonlinear Analysis of Functionally Graded Shells Based on 2-D Cosserat Constitutive Model
PublicationIn this paper geometrically nonlinear analysis of functionally graded shells in 6-parameter shell theory is presented. It is assumed that the shell consists of two constituents: ceramic and metal. The mechanical properties are graded through the thickness and are described by power law distribution. Formulation based on 2-D Cosserat constitutive model is used to derive constitutive relation for functionally graded shells. Numerical...
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Novel vitamin D photoproducts and their precursors in the skin
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Role of Vitamin D in schizophrenia in elderly patient
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ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS
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Volumetric and acoustic properties of D-mannitol in aqueous sodium or magnesium(II) chloride solutions over temperature range of 293.15 to 313.15 K
PublicationWykorzystując zmierzone wartości gęstości oraz prędkości rozchodzenia się dźwięku wyznaczono pozorne objętości molowe i pozorne ściśliwości molowe D- mannitolu w (1, 5 i 10) % wodnych roztworach chlorku sodu oraz chlorku magnezu(II). Obliczono graniczne wartości pozornych wielkości molowych, odpowiednie funkcje przeniesienia oraz współczynniki rozszerzalności. Otrzymane wielkości powiązano z oddziaływaniami D-mannitol -sól (NaCl...
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Efficient and robust quadratures for isogeometric analysis: Reduced Gauss and Gauss–Greville rules
PublicationThis work proposes two efficient quadrature rules, reduced Gauss quadrature and Gauss–Greville quadrature, for isogeometric analysis. The rules are constructed to exactly integrate one-dimensional B-spline basis functions of degree p, and continuity class C^{p−k}, where k is the highest order of derivatives appearing in the Galerkin formulation of the problem under consideration. This is the same idea we utilized in Zou et al....
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Electron scattering by trimethylene oxide, c-(CH2)3O, molecules
PublicationZmierzono całkowity przekrój czynny na rozproszenie elektronów na drobinach c-(CH2)3O w zakresie energii 1 - 400 eV. Wyniki porównano z elastycznymi i jonizacyjnymi przekrojami czynnymi obliczonymi dla tej drobiny. Przedyskutowano energetyczną zależność całkowitego przekroju czynnego na rozproszenie dla rodziny eterów cyklicznych (CH2)nO, n=2-4.
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Canonic structures of old order elliptic Gm-C filters.
PublicationW pracy zaproponowano nowe struktury kanoniczne eliptycznych filtrów Gm-Crzędów nieparzystych. Opracowane układy filtrów wymagają małej liczby elementów zarówno aktywnych jak i pasywnych niezbędnych do realizacji żądanych charakterystyk częstotliwościowych.W pracy są również zaprezentowane rezultaty porównań właściwości przedstawionych struktur z przykładami realizacji układowych innych filtrów Gm-C.
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The Efficacious Benefit of 25-Hydroxy Vitamin D to Prevent COVID-19: An In-Silico Study Targeting SARS-CoV-2 Spike Protein
PublicationThe environment has rapidly looked at proven specialist task forces in the aftermath of the COVID-19 pandemic to build public health policies and measures to mitigate the effects of emerging coronaviruses. According to the researchers, taking 10 μg of 25-hydroxy vitamin D daily is recommended to keep us safe. There have been several studies recently indicating that there is a reduced risk of contracting Coronavirus by 25-hydroxy...
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A fault diagnosis method for analog parts of embedded systems based on time response and identification curves in the 3-D space
PublicationPrzedstawiono nową wersję 3-D nowej metody diagnostycznej części analogowych w mieszanych sygnałowo systemach wbudowanych bazujących na mikrokontrolerach. Bazuje ona na krzywych identyfikacyjnych w przestrzeni 3-D i pomiarze próbek napięcia odpowiedzi układu badanego na pobudzenie impulsem prostokątnym. Zalety metody: pomiary są wykonywane wyłącznie za pomocą urządzeń peryferyjnych popularnych mikrokontrolerów, procedura diagnostyczna...
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Path integrals formulations leading to propagator evaluation for coupled linear physics in large geometric models
PublicationReformulating linear physics using second kind Fredholm equations is very standard practice. One of the straightforward consequences is that the resulting integrals can be expanded (when the Neumann expansion converges) and probabilized, leading to path statistics and Monte Carlo estimations. An essential feature of these algorithms is that they also allow to estimate propagators for all types of sources, including initial conditions....
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Electrical conductivity relaxation measurements - water uptake of BaCe0.6Zr0.2Y0.1Tb0.1O3-δ
Open Research DataFor Electrical Conductivity Relaxation (ECR) measurements, platinum reversible electrodes were applied in a four-probe arrangement and the BaCe0.6Zr0.2Y0.1Tb0.1O3-δ sample was measured in the ProboStat™ measurement system. The ECR measurements were performed in air in the temperature range of 450-800 ℃ after switching water partial pressure between...
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Electronic conductivity in the SiO2–PbO–Fe2O3 glass containing magnetic nanostructures
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AC and DC global electric circuit and the height profile of atmospheric conductivity
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Dynamic current-voltage characteristics of dielectrics with extremely low heat conductivity
PublicationZaprezentowano teoretyczny opis metody dynamicznych charakterystyk prądowo-napięciowych w przypadku znacznego gradientu temperatury w ciałach stałych o przewodności jonowej. Otrzymano rozwiązania równania transportu oraz równania charakterystyk, odnoszące się do ruchu cienkiej warstwy nośników ostałej grubości oraz warstwy rozszerzającej się. Podano także przybliżone wyrażenia opisujące czas przelotu nośników. Wyniki zweryfikowano...
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Impedance studies of diffusion phenomena and ionicand electronic conductivity of cerium oxide
PublicationW pracy zbadano właściwości elektryczne tlenku ceru z wykorzystaniem spektroskopii impedancyjnej. Badania wykazały występowania zjawiska dyfuzji, które jest prawdopodobnie związane z blokowaiem jonów na granicy faz. Bazując na zaproponowanym modelu obliczono przewodność elektronowa i jonową tlenku ceru.
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Elektrownia Ostrołęka C w budowie a „momentum-FSI”
PublicationMimo przeszkód, trwa budowa elektrowni Ostrołęka C. O tym zapewniają nas główni decydenci – Jarosław Małkowski, Prezes Elektrowni Ostrołęka, czy Sławomir Żygowski, Prezes GE Power, firmy odpowiedzialnej projekt, wykonanie i budowę. Możemy o tym dowiedzieć się w mediach społecznościowych. Ale te same media informują również, że 31 lipca 2019 r. Sąd okręgowy w Poznaniu stwierdził nieważność uchwały Walnego Zebrania Akcjonariuszy...
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The Imidazoacridinone Antitumor Drug, C-1311, Is Metabolized by Flavin Monooxygenases but Not by Cytochrome P450s.
PublicationPrezentowane w publikacji wyniki badań mają na celu wyjaśnienie roli enzymów wątrobowych w metabolizmie przeciwnowotworowych pochodnych C-1311 oraz C-1330. Oba związki inkubowane były z frakcją mikrosomalną oraz enzymami rekombinantowymi należącymi do grypy cytochromu P450, FMO oraz UGT. Badania wykazały, że oba związki są metabolizowane przez enzymy frakcji mikrosomalnej, ale nie przez enzymy cytochromu P450. Aktywność enzymatyczna...
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Intrinsic and extrinsic factors in anion electron -stimulated desorption: D- from deuterated hydrocarbons condensed on Kr and water ice films.
PublicationPrzedstawiono wynik desorpcji anionów D indukowanej zderzeniami elektronów ze skondensowanymi drobinami CD4, C2D6, C3D8,C2D4 i C2D2. Cienkie warstwy badanych drobin skondensowano na powierzchniach innych warstw atomowych i molekularnych (krypton porowaty i nieporowaty amorficzny lód) zestalony na powierzchni platyny. Zaobserwowano znaczące zaburzenia desorpcji anionów D poprzez obecność innych kondensatów. Zaproponowano oraz przedyskutowano...
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Equivalence of equicontinuity concepts for Markov operators derived from a Schur-like property for spaces of measures
PublicationVarious equicontinuity properties for families of Markov operators have been – and still are – used in the study of existence and uniqueness of invariant probability for these operators, and of asymptotic stability. We prove a general result on equivalence of equicontinuity concepts. It allows comparing results in the literature and switching from one view on equicontinuity to another, which is technically convenient in proofs....
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Canonic structures of odd-order elliptic Gm-C filters.
PublicationW pracy zaproponowano nowe rozwiązania układowe struktur kanonicznych eliptycznych filtrów Gm-C czasu ciągłego, rzedu nieparzystego. Opracowane struktury charakteryzują się małą liczbą elementów pasywnych oraz aktywnych i są przewidziane do zastosowań w filtrach niskomocowych o małej wrażliwości. W przeprowadzonych badaniach porównywano wybrane struktury 3-go rzędu pod względem właściwości i wymagań układów scalonych, w których...
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Dyes based on the D/A-acetylene linker-phenothiazine system for developing efficient dye-sensitized solar cells
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3-D finite-difference time-domain modelling of ground penetrating radar for identification of rebars in complex reinforced concrete structures
PublicationThis paper presents numerical and experimental investigations to identify reinforcing bars using the ground penetrating radar (GPR) method. A novel element of the paper is the inspection of different arrangements of reinforcement bars. Two particular problems, i.e. detection of few adjacent transverse bars and detection of a longitudinal bar located over or under transverse reinforcement, have been raised. An attention was also...
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Multilevel model order reduction with generalized compression of boundaries for 3-d FEM electromagnetic analysis
PublicationThis paper presents a multilevel Model Order Reduction technique for a 3-D electromagnetic Finite Element Method analysis. The reduction process is carried out in a hierarchical way and involves several steps which are repeated at each level. This approach brings about versatility and allows one to efficiently analyze complex electromagnetic structures. In the proposed multilevel reduction the entire computational domain is covered...
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Technique to improve CMRR at high frequencies in CMOS OTA-C filters
PublicationIn this paper a technique to improve the common-mode rejection ratio (CMRR) at high frequencies in the OTA-C filters is proposed. The technique is applicable to most OTA-C filters using CMOS operational transconductance amplifiers (OTA) based on differential pairs. The presented analysis shows that a significant broadening of CMRR bandwidth can be achieved by using a differential pair with the bodies of transistors connected to...
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A New Expression for the 3-D Dyadic FDTD-Compatible Green's Function Based on Multidimensional Z-Transform
PublicationIn this letter, a new analytic expression for the time-domain discrete Green's function (DGF) is derived for the 3-D finite-difference time-domain (FDTD) grid. The derivation employs the multidimensional Z-transform and the impulse response of the discretized scalar wave equation (i.e., scalar DGF). The derived DGF expression involves elementary functions only and requires the implementation of a single function in the multiple-precision...
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The effect of UV-C irradiation on lipids and selected biologically active compounds in human milk
PublicationThe effect of UV-C irradiation of human milk on lipid oxidation, content of antioxidants (vitamin C and catalase, CAT) and bactericidal compounds (lysozyme), as well as the total antioxidant capacity (TAC), of the breast milk was investigated. In parallel, the extent of inactivation of some bacteria was also determined. UV-C at doses from 85 to 740 J L−1 caused total inactivation of Escherichia coli and Staphylococcus aureus, but...
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Electrochemical and in silico approaches for liver metabolic oxidation of antitumor-active triazoloacridinone C -1305
Publication5-Dimethylaminopropylamino-8-hydroxytriazoloacridinone (C-1305) is a promising antitumor compound developed in our laboratory. A better understanding of its metabolic transformations is still needed to explain the multidirectional mechanism of pharmacological action of triazoloacridinone derivatives at all. Thus, the aim of the current work was to predict oxidative pathways of C-1305 that would reflect its phase I metabolism. The...
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Demonstrator technologii C-IED
PublicationArtykuł przedstawia budowę i działanie opracowanego na Politechnice Gdańskiej demonstratora technologicznego systemu AEGIS, przeznaczonego do przeciwdziałania atakom z wykorzystaniem prowizorycznych urządzeń wybuchowych detonowanych drogą radiową (RCIED — Radio Controlled Improvised Explosive Devices). Przedstawiono zaimplementowaną oryginalną metodę generowania sygnału zagłuszającego o dowolnie ukształtowanym widmie częstotliwościowym,...
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Solid State Conductivity of Optimized Polypyrrole Coatings on Iron Obtained from Aqueous Sodium Salicylate Solution Determined by Impedance Spectroscopy
PublicationIn this work the optimization procedure for corrosion resistance, surface analysis and electrical properties of PPy-Fe electrodes have been examined. Polypyrrole (PPy) film was electrochemically synthesized in a one step process from an aqueous solution of sodium salicylate and pyrrole with certain concentrations, different parameters and type of polymerization...
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Comparisson of area specific resistance of the SrTi1-xFexO3-d porous oxygen electrodes and state-of-the-art LSCF sintered at optimal conditions
Open Research DataIn this dataset are presented results of the polarization resistance of optimaly sintered SrTi1-xFexO3-d porous oxygen electrodes in symetrical cell (1000 °C; 800 °C and 800°C respectively x = 0.35; 0.50 and 0.70). For commparison were selected commercially avilable state-of-the-art LSCF (Europa) sintered at 1050 °C. The measurement temperature range...
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Relationships between concentrations of selected organohalogen contaminants and thyroid hormones and vitamins A, E and D in Faroese pilot whales
PublicationPilot whales (Globicephala melas) from the Faroe Islands, North-East Atlantic, have high body concentrations of organohalogenated compounds (OHCs), such as polychlorinated biphenyls (PCBs), organochlorinated pesticides (OCPs) and brominated flame retardants (BFRs). The aim of the present study was to examine if and to what extent blood plasma and liver concentrations of several groups of these OHCs are related to concentrations...
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2-D constitutive equations for orthotropic Cosserat type laminated shells in finite element analysis
PublicationWe propose 2-D Cosserat type orthotropic constitutive equations for laminated shells for the purpose of initial failure estimation in a laminate layer. We use nonlinear 6-parameter shell theory with asymmetric membrane strain measures and Cosserat kinematics as the framework. This theory is specially dedicated to the analysis of irregular shells, inter alia, with orthogonal intersections, since it takes into account the drilling...
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Structure generation and performance comparison of elliptic Gm-C filters.
PublicationW oparciu o zestaw macierzy opisujący ogólną topologię filtrów typu Gm-C opracowano procedurę efektywnej generacji struktur filtrów dolnoprzepustowych. Dla filtrów tego typu podano wyrażenia pozwalające analizować właściwości wrażliwościowe oraz określono zestaw odpowiednich kryteriów porównawczych. Szczegółowe badania porównawcze przeprowadzono dla wybranych filtrów 3-go rzędu w tym realizowanych w strukturach LF(leapfrog) i...
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Analogowy filtr Gm-C odbiornika GSM z automatycznym dostrajaniem częstotliwości
PublicationW referacie przedstawiono scalony analogowy filtr CMOS Gm-C z układem automatycznego dostrajania charakterystyk częstotliwościowych, spełniający wymagania filtru kanałowego odbiornika telefonii komórkowej GSM. Jest to w pełni różnicowy dolnoprzepustowy filtr eliptyczny 5-go rzędu, charakteryzujący się niskim poborem mocy (2,4 mW) i małą powierzchnią struktury krzemowej (0,31 mm2). Częstotliwość graniczna filtru jest dostrajana...
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Electrical conductivity relaxation measurements - oxidation and reduction of BaCe0.6Zr0.2Y0.1Tb0.1O3-δ
Open Research DataThe dataset consists of 2 main catalogs: measurements performed for oxidation/reduction in dry conditions and in humid conditions. For Electrical Conductivity Relaxation (ECR) measurements, platinum reversible electrodes were applied in a four-probe arrangement and the sample was measured in the ProboStat™ measurement system. The ECR measurements were...
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Anticancer Imidazoacridinone C-1311 is Effective in Androgen-Dependent and Androgen-Independent Prostate Cancer Cells
PublicationAndrogen receptor (AR) plays a crutial role in prostate cancer (PCa) development and metastasis. Here, we reported potent anti-PCa activity of a small molecule imidazoacridinone C-1311. In AR-positive PCa cells, C-1311 was found to inhibit the transcriptional activity of AR uncovering a novel mechanism that may be relevant for its anticancer effect. Mechanistically, C-1311 decreased AR binding to prostate-specific antigen (PSA)...
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Assessment Of the Relevance of Best Practices in The Development of Medical R&D Projects Based on Machine Learning
PublicationMachine learning has emerged as a fundamental tool for numerous endeavors within health informatics, bioinformatics, and medicine. However, novices among biomedical researchers and IT developers frequently lack the requisite experience to effectively execute a machine learning project, thereby increasing the likelihood of adopting erroneous practices that may result in common pitfalls or overly optimistic predictions. The paper...
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The evaluation of the vibration measurement usability of electronic indicator lemag "premet C"
PublicationThe measuring possibilities of modern compression and combustion pressure analyzers are extended with additional functions. One of them is parallel to the pressure measurement, the measurement of vibrations in the region of the cylinder head. The paper presents a general assessment of the vibration measurement function of the electronic indicator LEMAG "PREMET C". This feature is very rarely offered by manufacturers of these devices....