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Search results for: amfoterycyna%20b
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Incorporation of the complete ammonia oxidation (comammox) process for modeling nitrification in suspended growth wastewater treatment systems
PublicationThe newly discovered process complete ammonia oxidation (comammox) has changed the traditional under-standing of nitrification. In this study, three possible concepts of comammox were developed and incorporated as part of an extended two-step nitrification model. For model calibration and validation, two series of long-term biomass washout experiments were carried out at 12 ◦C and 20 ◦C in a laboratory sequencing batch reactor....
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Rotational molding of polylactide (PLA) composites filled with copper slag as a waste filler from metallurgical industry
PublicationThe research work carried out so far indicates the ever wider possibilities and demand for shaping composite products in the rotational molding technology. This trend was the main reason to use waste-based filler from the metallurgical process as a filler for manufacturing polylactide (PLA)-based remolded composites. Copper slag (CS) was introduced in the single-step processing method to PLA matrix at 5, 10, 20, and 35 wt%. The...
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Microwave Characterization of Dielectric Sheets in a Plano-Concave Fabry-Perot Open Resonator
PublicationDespite its long history, a double-concave (DC) Fabry-Perot open resonator (FPOR) has recently gained popularity in the characterization of dielectrics in the 20–110 GHz range, mainly due to such novel accomplishments as full automation of the measurement process and the development of even ore accurate and computationally efficient electromagnetic model. However, it has been discovered that such a DC resonator suffers from unwanted...
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The Influence of the Depth of Cut in Single-Pass Grinding on the Microstructure and Properties of the C45 Steel Surface Layer
PublicationThe paper contains the results of a metallographic examination and nanoindentation test conducted for the medium carbon structural steel with low content of Mn, Si, Cu, Cr, and Ni after its grinding to a depth ranging from 2 μm to 20 μm, at constant cutting speed (peripheral speed) of vs = 25 ms−1 and constant feed rate of vft = 1 m/min. Applied grinding parameters did not cause the surface layer hardening, which could generate...
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Review of methods for assessing traffic conditions on basic motorway and expressway sections
PublicationMotorways and expressways are the core of each country’s road system. Road planning, design and management requires tools to ensure that roads have the right geometry, traffic layout and equipment. These include methods for capacity estimation and assessing traffic conditions. Because the paper focusses on the basic segments of motorways and expressways (sections located between interchanges and outside of their influence), its...
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Rotational Molding of Linear Low-Density Polyethylene Composites Filled with Wheat Bran
PublicationApplication of lignocellulosic fillers in the manufacturing of wood polymer composites (WPCs) is a very popular trend of research, however it is still rarely observed in the case of rotational molding. The present study aimed to analyze the impact of wheat bran content (from 2.5 wt.% to 20 wt.%) on the performance of rotationally-molded composites based on a linear low-density polyethylene (LLDPE) matrix. Microscopic structure...
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Information retrieval with semantic memory model
PublicationPsycholinguistic theories of semantic memory form the basis of understanding of natural language concepts. These theories are used here as an inspiration for implementing a computational model of semantic memory in the form of semantic network. Combining this network with a vector-based object-relation-feature value representation of concepts that includes also weights for confidence and support, allows for recognition of concepts...
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Rozwój Pucka, Kartuz i Nowego Dworu Gdańskiego w latach 2005-2013 = The development of Puck, Kartuzy and Nowy Dwór Gdański In the years 2005-2013
PublicationNa terenie województwa pomorskiego znajdują się 42 miasta. Wśród nich 28 to miejscowości o liczbie do 20 000 mieszkańców. Stanowią one 66% wszystkich miast województwa. Według danych GUS na 2006 rok mieszka w nich 16% całkowitej liczby jego miejskiej ludności.W najbliższym sąsiedztwie Gdańska położone są trzy miasteczka o liczbie ludności w przedziale od 10 000 do 20 000. Są nimi: Puck, Kartuzy i Nowy Dwór Gdański. Choć są one...
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MINERAL MATTER IN MUNICIPAL SOLID WASTE
PublicationMunicipal solid waste (MSW) contains mineral materials which are seldom considered as a potential resource. Currently, the waste management sector pays attention to recyclable parts, biodegradable material, waste-to-energy fraction, and residues after waste reuse and recycle. In contrast, this study focus as on the mineral matter in MSW. The aim was to analyze and discuss the sources of mineral matter in MSW, the impact which the...
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Możliwość wykorzystania popiołów z osadów ściekowych w betonie
PublicationIlość popiołów lotnych ze spalania osadów ściekowych rośnie na całym świecie. Ich unieszkodliwianie jest poważnym problemem ekologicznym. W pracy przedstawiono ocenę możliwości wykorzystania popiołów lotnych z osadów ściekowych w betonie. Wykonano dwie serie badawcze dla dwóch współczynników (w/s) równych 0,49 oraz 0,55 z udziałem 10% i 20% popiołu lotnego (SSA), jako zamiennika cementu. Skład chemiczny wykazał, że popiół (SSA)...
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Mechanism of Reduced Sintering Temperature of Al2O3–ZrO2 Nanocomposites Obtained by Microwave Hydrothermal Synthesis
PublicationA novel method to obtain Al2O3–ZrO2 nanocomposites is presented. It consists of the co-precipitation step of boehmite (AlO(OH)) and ZrO2, followed by microwave hydrothermal treatment at 270 ◦ C and 60 MPa, and by calcination at 600 ◦ C. Using this method, we obtained two nanocomposites: Al2O3–20 wt % ZrO2 and Al2O3–40 wt % ZrO2. Nanocomposites were characterized by Fourier transformed infrared spectroscopy, Raman spectroscopy,...
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Sustainable utilization of copper post-flotation waste in cement composites
PublicationThe current way of managing the copper ore flotation waste is by placing it in waste neutralization facilities. However, flotation waste has great potential in application in cement composites. The article presents the detailed characteristics of post-flotation waste (PFW) and three types of cements: CEM I, CEM II/B-V, and CEM III/A, 42.5 MPa class. The post-flotation waste added for 20% of the cement mass increase the water demand...
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Smaller Representation of Finite State Automata
PublicationThis paper is a follow-up to Jan Daciuk's experiments on space-effcient finite state automata representation that can be used directly for traversals in main memory. We investigate several techniques of reducing memory footprint of minimal automata, mainly exploiting the fact that transition labels and transition pointer offset values are not evenly distributed and so are suitable for compression. We achieve a gain of around 20-30%...
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Modeling of Surface Roughness in Honing Processes by UsingFuzzy Artificial Neural Networks
PublicationHoning processes are abrasive machining processes which are commonly employed to improve the surface of manufactured parts such as hydraulic or combustion engine cylinders. These processes can be employed to obtain a cross-hatched pattern on the internal surfaces of cylinders. In this present study, fuzzy artificial neural networks are employed for modeling surface roughness parameters obtained in finishing honing operations. As...
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Wear in siding friction tests. Ring-on-ring contact. Sintered alumina ceramics (98%). Paraffin oil lubrication. Specim. sets #20-#21, #22-#23, #24-#25, #26-#27, #28-#29,#30 - #31. Run time: 0-4h. High frequency burst recording.
Open Research DataWear in sliding friction tests in ring-on-ring contact. Sintered alumina ceramics (98%) in self-mated contact. Lubrication: paraffin oil. Sliding velocity: 0.2 m/s. Mean contact stress: 10 MPa. Test rig: PT-3 Tribometer. High frequency burst recording.Running time: 0 - 4h.Specimen sets:Specim. sets (# [upper, rotating] - #[lower, non-rotating]):#20-#21,...
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Mariusz Jaczewski dr inż.
People -
Analiza holenderskich doświadczeń w zakresie logistyki miejskiej
PublicationW artykule dokonano analizy holenderskich doświadczeń w zakresie logistyki miejskiej i organizacji systemu dostaw towarów na przykładzie Utrechtu. Wybór miasta podyktowany był ponad 20 letnim konsekwentnym zaangażowaniem i doświadczeniem w tej dziedzinie. Przedstawiono zmiany w podejściu do problemów miejskiego transportu ładunków z punktu widzenia polityki krajowej oraz przebieg procesu decentralizacji odpowiedzialności na poziom...
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System oceny efektywności użytkowania aparatów słuchowych (Hearing aid use effectiveness evaluation system)
PublicationCelem rozprawy jest opracowanie metody oceny efektywności protezowania słuchu przy użyciu aparatów słuchowych, która pozwoli w łatwy sposób poddawać ocenie korzyść z użytkowania protez słuchowych w najbardziej typowych sytuacjach akustycznych. Przedstawiono genezę podjętych badań i na tej podstawie zaproponowano cele i tezy rozprawy doktorskiej. W pracy w pierwszej kolejności zawarto przegląd dotyczący rodzajów ubytku słuchu...
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Ryszard Woźniak dr inż.
PeopleRyszard Woźniak received his M.Sc. (1984) from the Lublin University of Technology specializing in Cars and Tractors. In 2002, at the Gdansk University of Technology he defended his doctoral thesis on: "Tyre/road noise when large longitudinal forces are applied in tyre/road contact patch" and obtained a doctorate degree in technical sciences in the field of construction and operation of machines. Currently he is an adjunct at the...
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Dezmetan Development of technology for substrate preparation used in methane co-fermentation using disintegration methods
ProjectsProject realized in Faculty of Civil and Environmental Engineering according to POIR.04.01.02-00-0022/17 agreement from 2017-12-28
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Modelling Of Commercial Websites. A New Perspective On Usability And Customer Relation
PublicationFrom an economic point of view, a critical aspect of online services is their ability to retain customers. The aim of presented study was the use of a layered model VIPR (Visual - Interaction - Process - Relation ) for commercial services online. The indicator of trust and establishing lasting relationships were assessment achieved from experienced users of commercial online services (n = 207), obtained by means of Web Credibility...
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Jakub Miler dr inż.
PeopleAcademic career: 2000: Master of Science - Gdansk University of Technology, Faculty of Electronics, Telecommunications and Informatics, thesis "Computer system for supporting risk management in a software engineering project", supervisor prof. Janusz Górski 2005: PhD - Gdansk University of Technology, Faculty of Electronics, Telecommunications and Informatics, thesis "A Method of Software Project Risk Identification and Analysis",...
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Macrophytobenthos in the Puck Bay in 2010–2018 Dataset
PublicationThe dataset titled Biomass of macrophytobenthos in the Puck Bay in 2010-2018 con-tains data on the qualitative composition and biomass of macrophytobenthos (flow-er plants and macroalgae) in samples collected in the Puck Bay area (Gulf of Gdańsk, southern Baltic Sea) at 20 stations between 2010–2018. The data was supplemented with additional information: values of measured parameters of water and sediment, e.g. tem-perature...
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Fatigue resistance investigation of the IC engine MB11 bearings, working under conditions of dynamic unidirectional loadings
PublicationThe slide bearing material MB11 fatigue resistance has been investigated with the application of SMOK - test stand in which dynamic unidirectional loadings to the test bearing is generated. Slide bearing layer consists of the bronze MB11 ( Cu Pb22 Sn 3 ) sintered to the steel shell. Each of the tested bearing has been subject to the standard 20-hour test, under conditions of the full fluid lubrication. Methodology of the experiments,...
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The modyfication of the dynamic characteristics of vibratory conveyor
PublicationThe vibratory conveyors are used in the industry for continuous transportation of loose substances on distance up to 20meters. These conveyors are often suspended on expensive and massive frames, which are softly vibroisolated from the ground. As a result, they transfer significant dynamic forces on the ground. In case of 5 - 20 meter-long devices, the biggest construction problems are proper vibrations of the panel caused by bilateral...
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Metoda szybkiego wyznaczania par węzłowo rozłącznych tras dla ochrony transmisji unicast
PublicationW celu ochrony transmisji przed awarią węzłów/łączy wykorzystuje się alternatywne trasy transmisji. Jednakże, złożoność obliczeniowa dostępnych algorytmów doboru tras rozłącznych często istotnie wstrzymuje producentów sprzętu od implementacji tychże rozwiązań. W pracy prezentujemy nowe podejście wyznaczania par rozłącznych tras bazujące na transformacji grafu sieci w meta strukturę. Wyniki badań odnośnie czasu wyznaczania tras...
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Application of the Bodner-Partom constitutive equations for modelling of the technical fabric Valmex used for the hanging roof of the Forest Opera in Sopot
PublicationThe study of an inelastic properties of the technical fabric Valmex used for 20 years as the roof structure of the Forest Opera in Sopot (Poland) is presented. The uniaxial tensile laboratory tests with constant strain rate have been conducted and analysed. Parameters of the Bodner-Partom constitutive model have been identified and verified by numerical simulations. Two approaches of the parameters identification have been proposed:...
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Experimental analysis of wear resistance of compacts of fine-dispersed iron powder and tungsten monocarbide nanopowder produced by impulse pressing
PublicationThe paper presents the results of studying the structure and wear resistance of compacts produced from fine dispersed reduced iron powder (average particle size 3–mu m) with the addition of tungsten carbide (WC) nanopowder with the average particle size of 25–30 nm. The mass fraction of tungsten carbide (wolfram carbide) in the powder composition was 5% and 10% of the total mass. Impulse pressing was conducted using the modified...
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L’indistricabile intreccio. Imprese, imprenditori e regime fascista. (An Inextricable Intertwining. Companies, Entrepreneurs, and the Fascist Regime)
PublicationThe papers of this section analyse the relationships between the economic and business community and the fascist regime. Their aim is to refresh the interpretations that were established in the 1960s-1970s and remained undisputed in the decades thereafter, becoming a sort of mantra among Italian contemporary historians. The article presents the most relevant contributions of that historiographical season, explaining the reasons...
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The influence of combination of binding agents on fatigue properties of deep cold in-place recycled mixtures in Indirect Tensile Fatigue Test (ITFT)
PublicationThe publication presents fatigue properties of cold recycled mixtures for eight combinations of binding agents (cement and bituminous emulsion). Cold recycled mixtures were evaluated in Indirect Tensile Fatigue Test (ITFT) at the temperature of 20 C in controlled stress mode. As a function of horizontal stress, fatigue life is strongly influenced by combination of the binding agents. When fatigue life is analyzed as a function...
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Formation of High Corrosion Resistant Nanotubular Layers on TitaniumAlloy Ti13Nb13Zr
PublicationThis paper presents results of oxidation tests and corrosion investigations of titanium alloy Ti13Nb13Zr performed at different conditions. The oxide layers have been formed by electrochemical method in 2M H3PO4 + 0.3% HF solution for 30 min. and 1 h at 20 V constantvoltage. The corrosion tests have been made by potentiodynamic method in Ringer`s solution at pH ranged between 3 and 7. It has been shown that the nano-oxide films,...
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Formation of High Corrosion Resistant Nanotubular Layers on TitaniumAlloy Ti13Nb13Zr
PublicationThis paper presents results of oxidation tests and corrosion investigations of titanium alloy Ti13Nb13Zr performed at different conditions. The oxide layers have been formed by electrochemical method in 2M H3PO4 + 0.3% HF solution for 30 min. and 1 h at 20 V constantvoltage. The corrosion tests have been made by potentiodynamic method in Ringer`s solution at pH ranged between 3 and 7. It has been shown that the nano-oxide films,...
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Cultural heritage preservation - the engineers´ contribution
Publication10 lat dokonań w zakresie popularyzacji dziedzictwa kultury, szczególnie w aspekcie Rekomendacji Rady Europy No. R(90) 20 w sprawie ochrony i konserwacji dziedzictwa techniki, przemysłu i inżynierii budowlanej. Sprawozdanie z konferencji PIH-Go w 1993 i 1995, projektu ''Technology & Heritage" w 1997 oraz PEH-GO 2000 w 1999 r. Informacja metodyczna o przedmiocie humanistycznym ''Kulturotwórcze aspekty budownictwa'', realizowanym...
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Oznaczanie struktury triacylogliceroli metodą Brockerhoffa i metodą ISO
PublicationPorównano metody badania struktury triacylogliceroli na przykładzie dwóch różnych olejów roślinnych: oleju rzepakowego i oleju oliwkowego. Stosowano dwie różne metody: metodą Brockerhoffa i metodę ISO. Stwierdzono, że badanie struktury TAG wg ISO wymagało wprowadzenia istotnych zmian do procedury objętej normą. Dla uzyskania ~20% MAG w produktach lipolizy konieczne było sporządzenie zawiesiny enzymu w roztworze TRIS. Po wprowadzeniu...
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Organometallic block copolymers as catalyst precursors for templated carbon nanotube growth.
PublicationArtykuł przedstawia zastosowanie organometalicznych kopolimerów blokowych jako prekursorów katalizatorów dla syntezy nanorurek węglowych. Zjawisko mikroseparacji fazowej kopolimerów blokowych zostało wykorzystane dla przygotowania matrycy aktywnych katalitycznie domen o rozmiarach ~20 nm. Domeny zawierające poli(ferrocenylosilan) (PFS) po utlenienu w plazmie tlenowej oraz redukcji z Fe(III) do Fe(II) oraz Fe(0) z powodzeniem katalizują...
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Determination of acetaldehyde and acrolein in raw spirits by capillary isotachophoresis after derivatization
PublicationW publikacji opisano optymalizację i przygotowanie nowej procedury oznaczania acetaldehydu i akroleiny w spirytusach surowych z wykorzystaniem techniki izotachoforezy kapilarnej (ITP). Aldehydy - związki niejonowe poddawane są derywatyzacji wodorosiarczynem sodu. Zaprezentowana metoda analityczna charakteryzuje się granicą oznaczalności na poziomie 0,03 ul/cm3 100% EtOH dla akroleiny oraz 0,54 ul/cm3 100% EtOH dla acetaldehydu....
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Photo-oxidation of dissolved cyanide using TiO2 catalyst
PublicationZbadano utlenianie katalityczne jonów cyjankowych w układzie UV/TiO2. Szybkość utleniania zbadano dla różnego stężenia początkowego CN-, wartość pH, formy katalizatora, temperatury oraz wprowadzanej formy gazowej. Stwierdzono że szybkość degradacji cyjanków w układzie UV/TiO2/O2 wzrasta dwukrotnie, jakkolwiek jest niezależna od ciśnienia cząstkowego tlenu (0,2-1,0 atm.). Wzrost temperatury środowiska reakcji w zakresie od 20 do...
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Wpływ budowy i krótkich czasów wygrzewania na stabilność termiczną lanych elastomerów uretanowych
PublicationW pracy przedstawiono syntezę lanych elastomerów uretanowych otrzymywanych metodą dwuetapową. Prepolimery o stężeniu grup NCO 6,5 i 7,9% otrzymano z diizocyjanianu difenylometanu (MDI) i Polesu 55/20, które przedłużano glikolem butylenowym, zawierającym katalizator DABCO. Poliuretany zsyntetyzowano przy stosunkach molowych NCO:OH od 0,95 do 1,15. Sieciowanie PUR przeprowadzono w przyjętych czasach w temperaturze 110 st.C. Do...
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Evaluation of thermal cracking probability for asphalt concretes with high percentage of RAP
PublicationThe paper presents determination of the probability of thermal cracking of asphalt mixtures with different reclaimed asphalt pavement (RAP) content on the basis of laboratory tests and analytical evaluation using thermal stress development method. Probability was evaluated taking into consideration: the type and gradation of the mixture and the quality and content of RAP. Thermal stresses were determined using two models: elastic and...
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Design analysis of Tesla micro-turbine operating on a low-boiling medium
PublicationThis paper presents results of the design analysis of a Tesla bladeless turbine intended for a co-generating micro-power plantof heat capacity 20 kW, which operates in an organic Rankine cycle on a low-boiling medium. Numerical calculations of flowin several Tesla turbine models were performed for a range of design parameters. Results of investigations exhibit interestingfeatures in the distribution of flow parameters within the...
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Al203 sealing elements lapping
PublicationPrzedstawiono wyniki badań własnych wydajnosci docierania ceramiki Al203. Badano elementy uszczelniające na docierarce jednotarczowej o standardowym układzie kinematycznym. Określono wpływ wielkości mikroziaren węglika boru o numerze F400/17, F800/6.5 i F1200/3 oraz wartości nominalnego nacisku jednostkowego na ubytek materiału w czasie 15 i 20 min. Scharakteryzowano mechanizm usuwania naddatku przy docieraniu elementów ceramicznych....
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Pathways of nitrogen compounds depletion in hybrid constructed wetlands
PublicationHybrid Constructed Wetlands are composed of two or more filters with mixed flow direction of sewage. Apparently in the HCWS the benefits of both types of bed are merged, resulting in better effluent quality (organic and nitrogen componds removal). Such heterogeneous environment creates possibilities for different ways of nitrogen "disappearing". The objective of the present study was to compare the removal of nitrogen with accompanying...
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Immobilized preparation of cold-adapted and halotolerant Antarctic β-galactosidase as a highly stable catalyst in lactose hydrolysis
PublicationZimnolubna rekombinowana beta-galaktozydaza antarktycznej morskiej bakterii Pseudoalteromonas sp. 22b została immobilizowana na chitozanie za pomocą aldehydu glutarowego. Preparat immobilizowanego enzymu w przeciwieństwie do preparatu enzymu w buforze reakcyjnym nie był inhibowany przez glukozę. Immobilizacja enzymu wpłynęła na podwyższenie o 10°C optymalnej temperatury aktywności względem jego nieimmobilizowanego odpowiednika...
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Degradable poly(ester-ether) urethanes of improved surface calcium deposition developed as novel biomaterials
PublicationBones, which are considered as hard tissues, work as scaffold for human body. They provide physical support for muscles and protect intestinal organs. Percentage of hard tissues in human body depends on age, weight, and gender. Human skeleton consists of 206 connected bones. Therefore, it is natural that the hard-tissue damage such as fractures, osteoporosis, and congenital lack of bone may appear. The innovative way of bone healing...
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Preparation and Characterization of Microsphere ZnO ALD Coating Dedicated for the Fiber-Optic Refractive Index Sensor
PublicationWe report the fabrication of a novel fiber-optic sensor device, based on the use of a microsphere conformally coated with a thin layer of zinc oxide (ZnO) by atomic layer deposition (ALD), and its use as a refractive index sensor. The microsphere was prepared on the tip of a single-mode optical fiber, on which a conformal ZnO thin film of 200 nm was deposited using an ALD process based on diethyl zinc (DEZ) and water at 100 °C....
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Experimental study and comparison with predictive methods for flow boiling heat transfer coefficient of HFE7000
PublicationThis article describes an experimental study of flow boiling of HFE7000 inside a smooth vertical channel. The investigation has been carried out in a circular stainless-steel tube with an inner diameter of 2.3 mm. The data have been collected for the applied heat fluxes q ranging from 61 to 205 kW/m2, the mass flux G ranging from 214 to 1006 kg/(m2 s), the saturation temperature Tsat ranging from 30 to 54 °C and the full range...
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The Physicochemical and Antibacterial Properties of Chitosan-Based Materials Modified with Phenolic Acids Irradiated by UVC Light
PublicationThis paper concerns the physicochemical properties of chitosan/phenolic acid thin films irradiated by ultraviolet radiation with wavelengths between 200 and 290 nm (UVC) light. We investigated the preparation and characterization of thin films based on chitosan (CTS) with tannic (TA), caffeic (CA) and ferulic acid (FA) addition as potential food‐packaging materials. Such materials were then exposed to the UVC light (254 nm) for...
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Applying response surface method to optimize the performance of a divergent-chimney solar power plant
PublicationOne of the effective tools to generate electricity from solar energy is Divergent-chimney solar power plant (DSPP). Divergent and cylindrical chimneys of solar power plants have different performances considering turbine pressure drop ratio (ft). For the first time, the divergent angle (DA) and solar radiation (SR) interaction effects on 〖ft〗_opt are discussed through applying the Computational Fluid Dynamics (CFD) and Response...
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Immittance Studies of Bi6Fe2Ti3O18 Ceramics
PublicationResults of studies focusing on the electric behavior of Bi6Fe2Ti3O18 (BFTO) ceramics are reported. BFTO ceramics were fabricated by solid state reaction methods. The simple oxides Bi2O3, TiO2, and Fe2O3 were used as starting materials. Immittance spectroscopy was chosen as a method to characterize electric and dielectric properties of polycrystalline ceramics. The experimental data were measured in the frequency range D = (101–107)...
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Prototypowy czujnik do oznaczania lotnych związków opganicznych w powietrzu
PublicationW pracy zaprezentowano prototypowy elektrochemiczny czujnik zbudowany na bazie cieczy jonowej do oznaczania związków z grupy lotnych związków organicznych (LZO). W czujniku zostały użyte komercyjne elektrody firmy DropSens. w postaci pasków z nadrukowanymi elektrodami na ceramicznym podłożu. Jako elektrolit i środowisko reakcji redox wykorzystano następujące ciecze jonowe: dicyjanoamid 1-butylo-3-metyloimidazoliowy ([BMIM][N(CN2)]),...