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Search results for: PDH
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Rothe’s method for physiologically structured models with diffusion
PublicationWe consider structured population models with diffusion and dynamic boundary conditions. The respective approximation, called Rothe’s method, produces positive and exponentially bounded solutions. Its solutions converge to the exact solution of the original PDE.
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Representation of magnetic hysteresis in a circuit model of a single-phase transformer
PublicationThe paper presents a mathematical model for the hysteresis phenomenon in a multi-winding single-phase core type transformer. The set of loop differential equations was developed for K-th winding transformer model where the flux linkages of each winding includes a flux common Φ to all windings as function of magneto motive force Θ of all windings. The first purpose of this paper is to determine a hysteresis nonlinearity involved...
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Representation of magnetic hysteresis in tape wound core using feedback Preisach model
PublicationThis paper presents a mathematical model for the hysteresis phenomenon in ferromagnetic tape wound core. The feedback scalar Preisach model of hysteresis is used to simulate magnetic behavior of the grain oriented silicon strip of ET114-27 type. Determination of B-H hysteretic curve is based on measurement of the initial magnetization curve and the main hysteresis loop. The Preisach distribution function (PDF) of ET114-27 material...
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Ultrasensitive electrochemical determination of the cancer biomarker protein sPD-L1 based on a BMS-8-modified gold electrode
PublicationThis work describes the modification of a gold electrode with the BMS-8 compound that interacts with the Programmed Death-Ligand 1 (PD-L1), an immune checkpoint protein. The results show that we can confirm the presence of the sPD-L1 in the concentration range of 10−18 to 10−8 M using electrochemical impedance spectroscopy (EIS) with a limit of detection (LOD) of 1.87 × 10−14 M for PD-L1 (S/N = 3.3) and at a concentration of 10−14...
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Kontrolne badania dynamiczne pali prefabrykowanych w czasie ich wykonawstwa
PublicationWyniki badań terenowych prefabrykowanych pali żelbetowych zastosowanych dla posadowienia centrum handlowego. Wykorzystano wyniki próbnych obciążeń statycznych, badania dynamiczne (PDA, CASE, CAPWAP) oraz wyniki obliczeń za pomocą wzoru dynamicznego.
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Exploring avian exposure to parent polycyclic aromatic hydrocarbons (PAHs): Using the common eider Somateria mollissima in a global context
PublicationCompared to other organic contaminants, birds are rarely studied for their exposure to polycyclic aromatic hydrocarbons (PAHs), mainly due to their effective metabolization of parent PAHs. However, as some studies suggest, exposure to PAHs may result in adverse health effects including decreased survival, especially following oil spills. In the present study, we analyzed samples from a sea duck, the common eider Somateria mollissima...
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Laser-Induced Graphitization of Polydopamine on Titania Nanotubes
PublicationSince the discovery of laser-induced graphite/graphene, there has been a notable surge of scientific interest in advancing diverse methodologies for their synthesis and applications. This study focuses on the utilization of a pulsed Nd:YAG laser to achieve graphitization of polydopamine (PDA) deposited on the surface of titania nanotubes. The partial graphitization is corroborated through Raman and XPS spectroscopies and supported...
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Równolegle przebiegające procesy separacji pianowej jonów Al(III), Cu(II) i Zn(II) z roztworów ich mieszanin
PublicationMetody flotacji jonowej i precypitacyjnej należą do procesów separacji pianowej, wykorzystujących zdolność selektywnej adsorpcji niektórych składników roztworu na powierzchni międzyfazowej gaz – ciecz. Do zalet separacji pianowej zalicza się m.in. niewysokie koszty inwestycyjne i eksploatacyjne oraz wysoką skuteczność w obróbce roztworów rozcieńczonych. Celem pracy jest ocena wpływu kluczowych parametrów na wydajność i przebieg...
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Creating IT competence centers
PublicationThis article indicates the need for supporting University Competence Centers. They are specialized centers, which aim to support teaching and development of newest software technologies, educating students, PhD Students and scientific workers also raising competetitiveness of the university at higher education market.
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Characterization of Defects Inside the Cable Dielectric With Partial Discharge Modeling
PublicationThe continuous monitoring of power system devices is an important step toward keeping such capital assets safe. Partial discharge (PD)-based measurement tools provide a reliable and accurate condition assessment of power system insulations. It is very common that voids or cavities exist in every solid dielectric insulation medium. In this article, different voids are modeled and analyzed using an advanced finite element (FE)-based...
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From phosphanylphosphaalkenes to coordination copper and silver polymers containing P–P bonds
PublicationThis study was focused on the activation of the C[double bond, length as m-dash]P bond via reactions of Ph2C[double bond, length as m-dash]P-PtBu2 (1) with 1,6-hexanediol and selected dithiols (1,4-butanedithiol, 1,4-benzenedithiol and 1,4-benzenedimethanethiol). These reactions proceed according to a 1,2-addition mechanism, providing new compounds with formulas {(Ph)2(H)C-P-PtBu2}{μ2-(O-(CH2)6-O)}{tBu2P-P-C(H)(Ph)2} (2), {(Ph)2(H)C-P-PtBu2}{μ2-(S-(CH2)4-S)}{tBu2P-P-C(H)(Ph)2}...
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Smart Asset Management for District Heating Systems in the Baltic Sea Region.
PublicationThe purpose of this review is to provide insight and a comparison of the current status of district heating (DH) systems for selected Baltic Sea countries (Denmark, Germany, Finland, Latvia, Lithuania, Poland, and Sweden), especially from viewpoints of application and solutions of novel smart asset management (SAM) approaches. Furthermore, this paper considers European projects ongoing from 2016, involving participants from the...
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Capping ligand initiated CuInS2 quantum dots decoration on, ZnIn2S4 microspheres surface under different alkalinity levels resulting in different hydrogen evolution performance
PublicationSurface distribution of quantum dots (QDs) at the semiconductor matrix caused by synthesis condition (e.g. pH of solution during coupling) could lead to different photocatalytic activity. Thus, achieving an optimal covering of semiconductor matrix by QDs has been challenging. Herein, the influence of the alkalinity level of aqueous decoration medium for the coupling of mercaptoundecanoic acid (MUA) capped CuInS2 quantum dots (CIS)...
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Ionic Liquid Assisted Dissolution of Dissolved Organic Matter and PAHs from Soil Below the Critical Micelle Concentration
PublicationIncreased use and production of ionic liquids (ILs) may result in emissions into the environment. Particularly vulnerable are industrial areas and landfills where ILs are utilized and ultimately disposed of. This study investigates how IL contamination can affect soil properties and the sorption of pre-existing contaminants. The commonly used IL 1-methyl-3-octyl imidazolium chloride ([OMIM][Cl]) was added at various quantities...
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SENSITIVITY OF PUBLIC PLACES IN GDAŃSK OSOWA DISTRICT
PublicationThis paper summarises the results of the research carried out at the University of Ljubljana, Faculty of Architecture, Slovenia, during the PhD visiting period of the first author from the Gdansk University of Technology, Poland, in the framework of the PhD course "Sensitive urban places", leaded by the second author. Focusing to the specific problems of the Gdansk Osowa district in Poland, this research develops the idea of sensitivity...
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An advanced synergy of partial denitrification-anammox for optimizing nitrogen removal from wastewater: A review
PublicationAnammox is a widely adopted process for energy-efficient removal of nitrogen from wastewater, but challenges with NOB suppression and NO3− accumulation have led to a deeper investigation of this process. To address these issues, the synergy of partial denitrification and anammox (PD-anammox) has emerged as a promising solution for sustainable nitrogen removal in wastewater. This paper presents a comprehensive review of recent developments...
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Combined partial denitrification/anammox process for nitrogen removal in wastewater treatment
PublicationRecently, the combined partial denitrification and anammox (PD/anammox) has received special attention as a viable alternative for N removal using organic matter present in municipal wastewater. In comparison with conventional nitrification-denitrification, PD/anammox provides enormous opportunities to achieve sustainable wastewater treatment due to the lack of dissolved oxygen (DO) demand, a smaller amount of organic carbon (C)...
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Module structure in Conley theory with some applications
PublicationA multiplicative structure in the cohomological versjon of Conley index is described . In the case of equivariant flows we apply the normalization procedure known from equivariant degree theory and we propose a new continuation invariant. The theory is then applied to obtain a mountain pass type theorem. Another application is a result on multiple bifurcations for some elliptic PDE.
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Two complementary approaches for the synthesis and isolation of stable phosphanylphosphaalkenes
PublicationPhospha-Wittig (phosphanylphosphinidene titanium(IV) complex) and phospha-Peterson (lithiated diphosphane) reactions were used to obtain phosphanylphosphaalkenes with the general formula XYC=P-PtBu2 (X = alkyl, aryl group or H; Y = alkyl or aryl group). Therefore, two series of reactions with different ketones and aldehydes were performed. An examination revealed that the two methods are complementary. For smaller carbonyl compounds,...
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Photoinactivation of Staphylococcus aureus using protoporphyrin IX: the role of haem-regulated transporter HrtA
PublicationLight- and photosensitiser-based antimicrobial photodynamic therapy is a very promising approach to the control of microbial infections. How the phenotypic features of a microorganism affect its response to photosensitiser-based photokilling represents an area of substantial research interest. To understand the mechanisms governing the phenomenon of a strain-dependent response to photodynamic inactivation (PDI), we analysed the...
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Kinetic characterization of hydrogen sulfide inhibition of suspended anammox biomass from a membrane bioreactor
PublicationThe inhibition effects of hydrogen sulfide (H2S) on anammox-enriched biomass from a laboratory membrane reactor were analyzed in a series of batch respirometric experiments. The determined half maximal inhibitory concentration (IC50) was 4.67 mg H2S-S L−1 at the constant pH = 7.0 and the total sulfide concentration varying between 1 and 15 mg TS-S L−1. In another test, the IC50 was found to be 4.25 mg H2S-S L−1 under a constant...
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Pomnik poety na Białorusi
PublicationInternetowy katalog aukcji charytatywnej http://www.wyspa.art.pl/library/File/katalog_maly1.pdf, która miała miejsce w Instytucie Sztuki Wyspa, we wrześniu 2011 roku. Katalog zawiera tekst krytyczny w języku polskim, noty biograficzne autorów, oraz 58 kolorowych reprodukcji prac. Wydawcą katalogu jest Instytut Sztuki Wyspa.
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bez tytułu
PublicationInternetowy katalog aukcji charytatywnej http://www.wyspa.art.pl/library/File/katalog_maly1.pdf, która miała miejsce w Instytucie Sztuki Wyspa, we wrześniu 2011 roku. Katalog zawiera tekst krytyczny w języku polskim, noty biograficzne autorów, oraz 58 kolorowych reprodukcji prac. Wydawcą katalogu jest Instytut Sztuki Wyspa.
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Adsorption of Cr(VI) in aqueous solution using sago bark (Metroxylon sagu) as a new potential biosorbent
PublicationThis paper investigated the ability of sago bark (Metroxylon sagu) as a new potential biosorbent in removing Cr(VI) in batch system. The optimum adsorption capacity of sago bark (Metroxylon sagu) was 61.73 mg/g achieved at pH 3, agitation rate of 100 rpm, contact time 60 min, particle size ≤32 μm, and initial concentration of Cr(VI) 1,000 mg/L at room temperature (25°C). The adsorbent regeneration was carried out using 0.01 M HNO3...
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Porównanie przebiegów równolegle zachodzących flotacji jonów cynku i miedzi
PublicationPrzedstawiono wyniki badań dotyczących wpływu pH oraz stężenia kolektora na efektywność procesów flotacji jonowej i precypitacyjnej zastosowanych do równoległego usuwania jonów cynku i miedzi z rozcieńczonych kwaśnych i alkalicznych roztworów wodnych. Najwyższe wartości stopnia wyflotowania dla obydwu metali odnotowano dla pH = 8,5-9,5 przy zastosowaniu SDS jako kolektora. Dla roztworów o pH>11 zaobserwowano spadek stopnia wyflotowania...
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Reprezentation of mechanic hysteresis in a railway track using the Preisach model
PublicationThis paper presents an implementation of the classic scalar Preisach model to describe the hysteresis phenomenon created in a railway track subjected to lateral (in the horizontal plane) displacements. The principles of the Preisach theory and the scalar mathematical model of the mechanical hysteresis that is based on statistically distributed modified hysteresis operators are briefly presented. This article presents the characteristic...
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Organic Pollution in Surface Waters from the Fuglebekken Basin in Svalbard, Norwegian Arctic
PublicationThe Fuglebekken basin is situated in the southern part of the island of Spitsbergen (Norwegian Arctic), on the Hornsund fjord (Wedel Jarlsberg Land). Surface water was collected from 24 tributaries (B1-B24) and from the main stream water in the Fuglebekken basin (25) between 10 July 2009 and 30 July 2009. The present investigation reveals the results of the analysis of these samples for their PAH and PCB content. Twelve of 16 PAHs...
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Contamination of Runoff Water at Gdańsk Airport (Poland) by Polycyclic Aromatic Hydrocarbons (PAHs) and Polychlorinated Biphenyls (PCBs)
PublicationAirport runoff can contain high concentrations of various pollutants, in particular polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs), the environmental levels of which have to be monitored. Airport runoff water samples, collected at the Gdańsk-Rębiechowo Airport from 2008 to 2009, were analysed for PAHs and PCBs by gas chromatography. The aromatic fractions were separated by liquid-liquid extraction...
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MSRL 2.0. as a new method for research education on urban issues
PublicationThe MSRL 2.0. research is focused on the Baltic Sea Region (BSR) as a multidimensional urban phenomenon with Gdansk acting as a hub for the research teams. The idea of the MSRL 2.0. is to promote the collaboration of professionals and graduate and PhD students by bringing together the mentor(s) with a local research team sharing experiences and proposing strategic recommendations to strengthen sustainable urban development initiatives...
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Higher-Order Spectra in Nanoparticle Gas Sensors.
PublicationPrzedstawiono wyniki badań rezystancji fluktuacji w rezystancyjnych sensorach gazu wykonanych z nanocząstek Pdx(WO3)1-x dla x=0.01 oraz x=0.12. Rozkład prawdopodobieństwa obserwowanych fluktuacji wskazywał na występowanie składowej o rozkładzie różnym od rozkładu normalnego. Do jego scharakteryzowania wykorzystano spektra wyższych rzędów oraz ich przekroje.
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RANS-based design optimization of dual-rotor wind turbines
PublicationPurpose An improvement in the energy efficiency of wind turbines can be achieved using dual rotors. Because of complex flow physics, the design of dual-rotor wind turbines (DRWTs) requires repetitive evaluations of computationally expensive partial differential equation (PDE) simulation models. Approaches for solving design optimization of DRWTs constrained by PDE simulations are investigated. The purpose of this study is to determine...
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Gender as a moderator between Present-Hedonistic time perspective and depressive symptoms or stress during COVID-19 lock-down
PublicationAlthough numerous studies have addressed the impact of the COVID-19 lock-downs on psychological distress, scarce data is available relating to the role of Present-Hedonistic (PH) time perspective and gender differences in the development of depressive symptoms and stress during the period of strict social distancing. We hypothesized that gender would moderate the relationship between PH and depressiveness or stress levels, such...
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Interaction of amphotericin B and its low toxic derivative, N-methyl-N-D-fructosyl amphotericin B methyl ester, with fungal, mammalian and bacterial cells measured by the energy transfer method.
PublicationPochodna amfoterycyny B ( AMB) ester metylowy N-metylo-N-D-fruktozylo amfoterycyny B (MFAME) wykazuje szerokie spektrum i wysoką aktywność przeciwgrzybową wyjściowego amtybiotyku i równocześnie toksyczność mniejszą o dwa rzędy wielkości. Celem tej pracy było ustalenie czy obserwowane różnice między toksycznością pochodnej i wyjściowego antybiotyku wynikają z różnic w powinowactwie do błon komórkowych grzybów i komórek ssakowych....
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Monitoring of organic pollutants in coastal waters of the Gulf of Gdańsk, Southern Baltic.
PublicationPrzedstawiono zmiany zawartości zanieczyszczeń organicznych (np. VOC, PAH, PCB, chlorofenoli) w wodach Zatoki Gdańskiej na przestrzeni 5-ciu lat. Zawartość VOX i VOC zmieniała się od kilku ngdm-3 do kilkuset ngdm-3, podczas gdy zawartość chlorofenoli fenoksykwasów była na poziomie kilku ngdm-3. W większości próbek nie wykryto PCB.
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Effect of transglutaminase on the solubility of chitosan-gelatin films
PublicationCelem pracy było zmniejszenie rozpuszczalności folii chitozanowo-żelatynowych w środowisku wodnym o różnym pH, poprzez usieciowanie składników przy użyciu transglutaminazy. Niemodyfikowane enzymatycznie folie rozpuszczały się w temperaturze pokojowej w 86 i 64% odpowiednio w buforze o pH 3 i 6. Ich rozpuszczalność została ograniczona do 19-23% po usieciowaniu polimerów enzymem w stężeniu 0.2mg/ml filmotwórczego roztworu. Enzymatycznie...
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Creating a modern educational system based on IT competence centers
PublicationThis article indicates the need to support University Competence Centers. These are specialized cen-ters which aim to support teaching and the development of the latest software technologies, educating students, PhD students and scientific workers and also raising the competitiveness of the university on the higher education market. The article presents the characteristics of: IBM Rational RequisitePro, IBM Rational Requirements...
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Numerical modeling of the combustion in a lab-scale pulverized-coal fired combustion chamber
PublicationThis work presents results of numerical modeling of the combustion process inside a lab-scale drop-tube chamber, designed to investigate the slagging properties of the flue ashes, created through the solid fuel firing. Interaction between turbulence and chemistry is accounted by use of probability density function (PDF). FLUENT inputs for non-premixed combustion chemistry modeling are defined. A discrete second phase of the coal...
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Numerical modeling of the combustion in a lab-scale pulverized-coal fired combustion chamber
PublicationThis work presents results of numerical modeling of the combustion process inside a lab-scale drop-tube chamber, designed to investigate the slagging properties of the flue ashes, created through the solid fuel firing. Interaction between turbulence and chemistry is accounted by use of probability density function (PDF). FLUENT inputs for non-premixed combustion chemistry modeling are defined. A discrete second phase of the coal...
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Możliwości zagospodarowania serwatki odpadowej w zakładach przetwórstwa mleka
PublicationBadano możliwosci usuwania i odzyskiwania białek z serwatki odpadowej metodą separacji pianowej. Proces prowadzono we współpradowej kolumnie barbotażowej. Przedstawiono wpływ parametrów procesowych na efektywność usuwania białka z roztworu. Ustalono, że im Ph roztworu modelowego jest bliższe naturalnemu PH serwatki, tym wyższa wartość współczynnika wyflotowania.
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Usuwanie jonów miedzi ze ścieków metodą flotacji precypitacyjnej
PublicationZbadano wpływ pH surówki, stężenia kolektora i prędkości przepływu powietrza na skuteczność, ocenianą wartościami końcowego stopnia wyflotowania, flotacji precypitacyjnej Cu(II). Najwyższe wartości stopnia wyflotowania uzyskano w zakresie pH 8,5 - 10,5. Stwierdzono, że korzystne z punktu widzenia efektywności procesu, jest stosowanie niskich prędkości przepływu powietrza
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Identification and molecular modeling of a novel lipase from an Antarctic soil metagenomic library.
PublicationIn this work, we present the construction of a metagenomic library in Escherichia coli using pUC19 vector and environmental DNA directly isolated from Antarctic topsoil and screened for lipolytic enzymes. The screening on agar supplemented with olive oil and rhodamine B revealed one clone with lipolytic activity (Lip1) out of 11,000 E. coli clones. This clone harbored a plasmid, pLip1, which has an insert of 4722 bp that has been...
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Advanced surveillance and operational communication system employing mobile terminals
PublicationDistributed surveillance and operational communications system based on XMPP protocol is presented. Its architecture and assumptions leading to the depicted design are shown. Features of XMPP protocol are portrayed with the emphasis on those most important in the context of the application. Real-time multimedia transmission with the use of Jingle/XMPP extension is discussed. The use of PDA-class computers as mobile terminals is...
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Badania wstępne kinetyki flotacji jonowej i precypitacyjnej glinu
PublicationZbadano wpływ pH, stężenia kolektora oraz prędkości przepływu powietrza na przebieg flotacji jonowej i precypitacyjnej Al(III). Stwierdzono, że pH surówki ma istotny wpływ na szybkość flotacji. Dla tych samych stężeń kolektora i prędkości przepływu powietrza, stałe szybkości flotacji przyjmują wyższe wartości w warunkach flotacji precypitacyjnej niż jonowej.
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Optimisation of conditions for precipitation of collagen from solution using kappa-carrageenan. Studies on collagen from the skin of Baltic cod (Gadus morhua)
PublicationZbadano wpływ stężenia kolagenu (0,012-3%) wyekstrahowanego ze skór dorsza bałtyckiego (Gadus morhua) i stężenia kappa-karagenu w obecności NaCl (0-5%) na wydajność strącania włókien kolagenowych z roztworu przy pH 2,2-8. Stwierdzono, że wydajność strącania włókien jest wprost proporcjonalna do masowego stosunku kappa-karagen : kolagen w zakresie niższym od 0,4. Kolagen rozpuszczony w kwasie cytrynowym jest całkowicie strącony,...
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Comparison of the paracetamol electrochemical determination using boron-doped diamond electrode and boron-doped carbon nanowalls
PublicationTwo different type of electrodes, boron-doped diamond electrode (BDD) and boron-doped carbon nanowalls (B:CNW) electrode, were used for the electrochemical determination of paracetamol using the cyclic voltammetry and the differential pulse voltammetry in phosphate buffered saline, pH = 7.0. The main advantage of these electrodes is their utilization without any additional modification of the electrode surface. The peak current...
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Effective degradation of sulfide ions and organic sulfides in cavitation-based Advanced Oxidation Processes (AOPs)
PublicationThe paper presents the results of investigations on the effectiveness and reaction rate constants of the oxidation of sulfide ions and organic sulfides in real industrial effluents from the production of bitumens (2000 mg S2- L-1) using hydrodynamic and acoustic cavitation. The content of the effluents was analysed in terms carbon disulfide, dimethyl sulfide, and di-tert-butyl disulfide concentration. A possibility of complete...
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Stable and degradable microgels linked with cystine for storing and environmentally triggered release of drugs
PublicationEnvironmentally sensitive, degradable microgels based on poly(N-isopropylacrylamide) (pNIPA) crosslinked with the diacryloyl derivative of cystine (BISS) were synthesized by applying surfactant-free emulsion polymerization. pNIPA contributed the sensitivity to temperature to the microgels and the cross-linker made them degradable and sensitive to pH. The morphology of the microgels was investigated by using scanning and transmission...
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Multi-pathway mechanism of polydopamine film formation at vertically aligned diamondised boron-doped carbon nanowalls
PublicationBoron-doped carbon nanowall (B:CNW) electrodes were used as a platform for studying the electropolymerisation of dopamine. Due to the unique properties of B:CNW, including the fast charge-transfer kinetics and high surface conductivity, a high degree of reversibility of redox reactions was achieved. Three separated redox peaks were observed on voltammograms and attributed to three fundamental reactions in the dopamine polymerisation...
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Ocena możliwości wykorzystania sieci pętlowych RPR I 10 Gigabit Ethernet do budowy sieci LAN/MAN/WAN
PublicationPrzedstawiono rozwiązania sieciowe: 10GE i RPR. W szczególności omówiono możliwość wykorzystania tych rozwiązań w sieciach LAN, MAN, WAN i ich współpracy z infrastrukturą SONET/SDH. Na tle zalet sieci zbudowanych całkowicie w technologii 10GE i ograniczeń jakim podlegają sieci Ethernet ukazano proponowane w RPR możliwości zarządzania pasmem i skuteczność mechanizmów reakcji na uszkodzenia. Przedstawiono koszty realizacji wybranych...
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Ocena przydatności bakterii Thermus ruber jako źródła termostabilnej alfa-glukozydazy użytecznej do wytwarzania syropów glukozowych
PublicationThermus ruber wytwarza alfa-glukozydazę o maksymalnej aktywności w temperaturze 65 C i przy pH 6,0. Wymieniony enzym zachowuje aktywność w zakresie pH 5,5-8,0 i prawie nie zmniejsza aktywności po 60 min inkubacji w 65 C. Szybkość hydrolizy maltozy, maltotetraozy, maltopentaozy oraz maltoheksaozy maleje wraz ze wzrostem masy cząsteckowej substratu.