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Wyniki wyszukiwania dla: MICRO/NANOMECHANICS
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Evaluating Business Accelerator Participants’ Experiences – Effectuation at Play?
PublikacjaResponding to the new phenomena in entrepreneurship ecosystems in Poland, the author undertakes the study that aims to explore experiences of participants of (pre)accelerator programme for start-ups. Clipster is a business an acceleration incubation programme, where participants have a unique co-living opportunity and work on their new venture ideas. With phenomenological interviews with six nascent entrepreneurs - participants...
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Evaluating Business Accelerator Participants’ Experiences – Effectuation at Play?
PublikacjaResponding to the new phenomena in entrepreneurship ecosystems in Poland, the author undertakes the study that aims to explore experiences of participants of (pre)accelerator programme for start-ups. Clipster is a business an acceleration and incubation programme, where participants have a unique co-living opportunity and work on their new venture ideas. With phenomenological interviews with six nascent entrepreneurs - participants...
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Comparative study of selected fluids for use in supercritical Organic Ranking Cycles
PublikacjaIn view of increasing interest in improving energy efficiency of energy conversion devices, there is an increasing requirement of combined production of heat and electricity as well as demand for increased implementation of renewable energy resources. The micro cogenerative units utilizing the Organic Rankine Cycle are focusing the attention of many research centres around the world. In the present paper calculations of ORC cycles...
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Deep compaction control of sandy soils
PublikacjaVibroflotation, vibratory compaction, micro-blasting or heavy tamping are typical improvement methods for the cohesionless deposits of high thickness. The complex mechanism of deep soil compaction is related to void ratio decrease with grain rearrangements, lateral stress increase, prestressing effect of certain number of load cycles, water pressure dissipation, aging and other effects. Calibration chamber based interpretation...
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Wind resource assessment and energy yield prediction for the small wind turbine on the Szubieniczne Hill
PublikacjaThe goal of this study is to preliminary assess the wind resources on the Szubieniczne Hill in order to predict the annual energy production for planned small wind turbine. The analyzed site is located close to the Gdańsk University of Technology campus, in complex urban environment additionally surrendered by forested hills. The assessment is based on Computational Fluid Dynamics simulations which allow to evaluate the wind energy potential...
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What fosters firm-level labour productivity in Eastern European and Central Asian countries?
PublikacjaThis study examines labour productivity performance and its determinants in Eastern European and Central Asian (EECA) firms using micro-level data. We find significant differences in labour productivity among members of the European Union in Eastern Europe and other Eastern European and Central Asian countries. We also confirm the important impact of foreign ownership, exporter status, and highly skilled workers on productivity...
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1.2V low-power four-quadrant CMOS transconductance multiplier operating in saturation region.
PublikacjaW pracy opisano niskomocową strukturę układową liniowego transkonduktancyjnego mnożnika czteroćwiartkowego pracującego w zakresie nasycenia. Układ analizowano z uwzględnieniem standardowego 0,35-mikrometrowego procesu CMOS. Przeprowadzone symulacje przy pomocy programu SPICE wykazały wysoką liniowość w odniesieniu do obu wejść sterujących X, Y. Np. dla sygnału harmonicznego 1 MHz; 0,3Vp-p na wejściu Y uzyskano zniekształcenia...
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Diody termiczne - potencjalne możliwości wykorzystania diod termicznych w technice
PublikacjaW artykule przedstawiono zagadnienia przewodnictwa i przenikania ciepła w różnych strukturach. Przeanalizowano działanie różnych rodzajów makro, mikro i nano diod termicznych. Wskazano możliwości transportu ciepła przy pomocy diod w ściśle określonym kierunku, oraz możliwości wykorzystania tych rozwiązań w budownictwie.
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Comparative modeling of shear zone patterns in granular bodies with finite and discrete element method
PublikacjaW artykule przedstawiono wyniki numeryczne naporu piasku na ściankę szczelną. Obliczenia wykonano stosując metodę elementów dyskretnych i skończonych na bazie mikropolarnego hipoplastycznego prawa materiałowego. Porównanie obu podejść wykonano na poziomie makro i mikro. Wyniki numeryczne porównano także z wynikami doświadczalnymi.
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Advancing sustainable hybrid bitumen systems: A compatibilization solution by functionalized polyolefins for enhanced crumb rubber content in bitumen
PublikacjaPolymer waste pollution has a profound effect on the environment and, consequently, on the lifestyle of hu- mankind. The massive production and disposal of cross-linked polymers clearly exemplify the challenges of recycling. Increasing efforts are being undertaken to introduce recycled polymers, especially crumb rubber (CR), into asphalt formulations. Due to the rather poor processability and phase separation associated with CR- modified...
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Mikrosiłownia domowa jako źródło energii cieplnej i elektrycznej
PublikacjaObiektem rozważań podejmowanych w ramach pracy jest kocioł gazowy sprzężony z laboratoryjnym modułem mikro-ORC. W badaniach zasto-sowano komercyjny kocioł, przeznaczony do użytkowania w gospodar-stwach domowych. Jest to kocioł gazowy firmy De Dietrich (DTG X23N) o mocy cieplnej 25 kW. Przy wyborze kotła jako źródła ciepła kierowano się jak największą popularnością pod kątem mocy grzewczej całej jednostki ORC w gospodarstwach domowych....
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Business applications of geolocation - modern solutions and trends
PublikacjaThe technological development of geolocation systems has resulted in the utilization of physical location of users by a growing number of entrepreneurs. As mobile technology develops, the use of geolocation in business is becoming widespread with a new range of geomarketing techniques. Entrepreneurs therefore more often utilize geolocation in their promotional and operational activities. In this article mobile-based geolocation...
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Wpływ rozwinięcia powierzchni na przenoszenie ciepła podczas wrzenia R 22 wewnątrz rur
PublikacjaPrzedstawiono wyniki badań przejmowania ciepła i spadku ciśnienia podczas wrzenia czynnika chłodniczego R 22 w przepływie wewnątrz rur poziomych. Badanymi rurami były: rura miedziana niskożebrowana typu "micro-fin", rura ze stali nierdzewnej śrubowoformowana, a także miedziana i stalowa rura gładka. Średnica zewnętrzna rur wynosiła 10 mm. Eksperymenty prowadzono przy temperaturze nasycenia 0 stopni C, stopniu suchości na wlocie...
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The effect of preliminary creep-strain on material behavior under LCF tension/compression and pure torsion regimes
PublikacjaThis paper presents the results of experimental tests of monotonic tension and torsion, creep-rupture and preliminary creep at 200C and 300C, as well as low-cycle fatigue of 2024 T3511 aluminum alloy. The fatigue process was conducted at room temperature for uniaxial tension/compression and torsion. The as-received material and pre-deformed material were also investigated during creep at elevated temperature. Basic monotonic,...
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Gdańsk Urban Initiative Laboratory
PublikacjaGdansk is Poland's principal seaport, situated on the southern edge of the Gdansk Bay on the Baltic Sea. The city is the capital and largest city of the Pomeranian Voivodeship. Gdansk, in a conurbation with the city of Gdynia and the resort town of Sopot, and suburban communities, jointly forms Poland's fourth largest metropolitan area, with a population approaching 1.4 million. The pathways towards the Micro ULL FWE Nexus Square...
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Application of deep eutectic solvents in analytical sample pretreatment (update 2017–2022). Part A: Liquid phase microextraction
PublikacjaSustainable development in all branches of human activity has become an unequivocal necessity in the last two decades, and green chemistry goes hand in hand with it. Various ways have been proposed in analytical chemistry to meet the current requirements of green chemistry. One such approach is the research of new reagents and solvents for analytical purposes. Deep eutectic solvents (DESs) began being investigated and used in analytical...
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Quality assessment of mobile host services in IP networks
PublikacjaW pracy opisano podstawowe protokoły wspierające komunikację stacji ruchomych w sieciach IP. Przedmiotem zainteresowania były w szczególności rozwiązania MIP oraz Calkular IP i HAWAII - wspierające mobilność w skali makro bądź mikro. Przeprowadzono badania symulacyjne wskazujące na przydatność powyższych protokołów w przypadku różnych konfiguracji sieci.
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Low cost real time UAV stereo photogrammetry modelling technique – accuracy considerations
PublikacjaThe paper presents accuracy considerations regarding three 3D modelling techniques. The tested new consumer type stereo camera (ZED 3D Stereolabs) has been implemented info an aerial mapping system, on board micro air vehicle MAV) and tested object has been mapped using a real-time photogrammetry with original real-time software application. The evaluated results has been compared with model gained with a state of art unmanned...
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HYDROGEN PRODUCTION PERFORMANCE IN THERMOCATALYTIC REACTOR BASED ON THE INTERMETALLIC PHASE OF NI3AL
PublikacjaThe main aim of the following paper is mathematical modelling for momentum, heat and mass transfer, which is accompanied by chemical surface reactions of the flow of the mixture helium and methanol. The thermocatalytic devices used for decomposition of hydrocarbons incorporate vertical microchannels coupling at the ends and heated to 500 oC at the walls. The results of the experiment were compared with CFD calculations to calibrate...
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Application of titanium dioxide thin films in fiber optic sensors
PublikacjaThe advance in the nanotechnology and fabrication of micro- and nanostructures has significant impact on development of new optical sensors. Presented study focuses on the applications of the titanium dioxide (TiO2) thin films in fiber optic sensors. The concept of a sensing fiber optic interferometer integrating TiO2 thin film is presented. The cavity of this interferometer is delimited by a 80 nm film fabricated on the end-face...
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Selected Aspect of IT Tools Application in Process Improvement in Industrial Laundry Services
PublikacjaThe laundry services sector in Poland is growing dynamically and currently has around 13,000 enterprises, mainly micro, small and medium size. The increasing competitiveness of this industry, causes more emphasis on solutions that can in-crease the efficiency of laundry processes and thereby strengthen the market position. One of the methods that can be used for this purpose is Lean Six Sigma, aided by specialized computer software....
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Procedure of determination of volatile trihalomethanes in human urine with perwaporation and gas chromatography
PublikacjaPraca przedstawia wyznaczanie podstawowych parametrów walidacyjnych nowej procedury oznaczania lotnych związków chlorowcoorganicznych z grupy trihalometanów w próbkach moczu ludzkiego, opartej na zastosowaniu:- techniki perwaporacji na etapie izolacji i wzbogacania analitów;- bezpośredniego dozowania próbek ekstraktów (permeatu) do kolumny chromatograficznej;- chromatograficznego rozdzielanie mieszaniny na poszczególne składniki;-wykorzystaniu...
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Investigations of Aerodynamics of Tesla Bladeless Microturbines
PublikacjaThe paper presents an analysis of a Tesla bladeless turbine for a co-generating micro-power plant of heat capacity 20 kW, whichoperates in an organic Rankine cycle with a low-boiling medium. Numerical calculations of flow in several Tesla turbine models areperformed for a range of design parameters. Results of investigations exhibit interesting features in the distribution of flowparameters within the turbine interdisk space. The...
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Application of microturbines in CHP systems with reciprocating engines
PublikacjaThe analysis was carried out for Combined Heat and Power generation systems with micro-turbines power plants working on heat rejected from the reciprocating engine. The calculations were performed for GE Jerbacher engines of J320 GS- C05, J320 GS- C25 and J416 GS- B05 types. We considered different working media (both wet and dry fluids): water, ammonia, ethanol, methanol, methylacetylene (propyne), dimethyloether, sulphur dioxide,...
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Partial characterization of white cabbages (Brassica oleracea var. capitata f. alba) from different regions by glucosinolates, bioactive compounds, total antioxidant activities and proteins
PublikacjaW pracy przedstawiono wyniki oznaczeń glukozynolanów (GLS), aktywności przeciwutleniającej (TRSA) oraz białek w próbkach białej kapusty pochodzącej z różnych rejonów geograficznych Europy. Glukobrassycyna i sinigryna były dominującymi GLS we wszystkich próbkach kapusty. Całkowita zawartość GLS mieściła się w zakresie od 3,3-7,7 µmol/g sm. Aktywność przeciwulteniająca próbek kapusty została oszacowana za pomocą testów ABTS,...
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High temperature corrosion of evaporator tubes with thermal sprayed coatings
PublikacjaDegradation examinations of outer surface of low-emission steam boiler evaporator tubes are presented in the paper. Metallographic evaluation of scale morphology, its micro sites chemical composition analysis and distribution of elements on cross sections have been performed. Water-wall tubes were exposed in steam boiler for up to two years period. Common tubes made of 16Mo3 steel suffered sulphide and molten salts corrosions....
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Corrosion of evaporator tubes in low emission steam boilers
PublikacjaPurpose of this paper is to reveal the mechanisms of corrosion processes of outer surfaces of low-emission steam boiler evaporator tubes. Examinations were performed to find the reasons of different corrosion susceptibility of tubes situated at combustion chamber on various levels. Examinations were conducted on several segments of 57 x 5.0 mm evaporator tubes made of 16M (16Mo3) steel grade. Segments were taken from level of...
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The dying medium temperature impact on the final moisture content of pine wood at constant drying time
PublikacjaThe results of final moisture content of pine wood (Pinus sylvestris L.) after drying process are presented. The wood in the experiments was taken from the northern part of Pomeranian region in Poland. The drying process was performed in the experimental chamber equipped with the micro-jet heat exchanger. The air at temperatures of 40°C, 60°C, 80°C, 100°C and 120°C with relative humidity about 60% and atmospheric pressure was the...
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Ultrasound-assisted deep eutectic solvent-based liquid–liquid microextraction for simultaneous determination of Ni (II) and Zn (II) in food samples
PublikacjaA new approach was developed for the simultaneous pre-concentration and determination of Ni (II) and Zn (II) in food samples. This method is based on ultrasound-assisted liquid–liquid micro extraction using hydrophobic deep eutectic solvent (DES) and 1,10-phenanthroline as chelating agent. The effect of several parameters, such as pH, selection and volume of DES, amount of chelating agent, time of sonication and centrifugation,...
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Internal imaging of concrete fracture based on elastic waves and ultrasound computed tomography
PublikacjaThe condition assessment of concrete structures belongs to the greatest challenges of non-destructive testing. Monitoring the fracture process of concrete and detecting cracks at the earliest possible stage is a vital aspect to ensure the safety of civil engineering objects. The use of ultrasound tomography enables imaging the internal structure of a tested element. This study aims at the visualization of fracture damage in concrete...
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Microfluidic devices for photo-and spectroelectrochemical applications
PublikacjaThe review presents recent developments in electrochemical devices for photo- and spectroelectrochemical investigations, with the emphasis on miniaturization (i.e., nanointerdigitated complementary metal-oxide-semiconductor devices, micro- and nano-porous silicon membranes or microoptoelectromechanical systems), silica glass/microreactors (i.e., plasmonic, Raman spectroscopy or optical microcavities) or polymer-based devices (i.e.,...
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Shadow Economy in Poland Recent Evidence Based on Survey Data
PublikacjaThe book provides an estimate of the size of the shadow economy in Poland. Using analogous data, it traces core determinants of the existence of the shadow economy in Poland. It compares results with neighbouring countries, and if possible, the remaining Central-Eastern economies. The book tells why the problem of the unreported economic activity matters; it presents the problem from different angles―economic, social and institutional....
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Leveraging spatio-temporal features for joint deblurring and segmentation of instruments in dental video microscopy
PublikacjaIn dentistry, microscopes have become indispensable optical devices for high-quality treatment and micro-invasive surgery, especially in the field of endodontics. Recent machine vision advances enable more advanced, real-time applications including but not limited to dental video deblurring and workflow analysis through relevant metadata obtained by instrument motion trajectories. To this end, the proposed work addresses dental...
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Water absorption and blistering of glass fibre-reinforced polymer marine laminates with nanoparticle-modified coatings
PublikacjaMacro and microstructural damage was studied in typical glass fibre-reinforced polymer laminates with two types of coating systems – (a) isophtalic gel coat: pure or mixed with SiO2 nanoparticles 5 wt% (5%N) or 10 wt% (10%N) and (b) a two-layer coating system: urethane-modified vinyl ester-based gel coat and additional polyester barrier coat layer. Accelerated tests were performed at 50C for 50 days for specimens with nanoparticle-modified...
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Wsparcie finansowe małych i średnich przedsiębiorstw w Polsce z funduszy strukturalnych Unii Europejskiej
PublikacjaProgramy Operacyjne finansowane ze środków Unii Europejskiej rozszerzyły możliwości finansowania działalności gospodarczej. W artykule przedstawiono działania, które w ramach tych programów mogą stać się bezzwrotnymi źródłami finansowania mikro, małych i średnich przedsiębiorstw w Polsce. Dokonano również analizy zainteresowania firm sektora MSP tymi nowymi możliwościami oraz skuteczności wnioskowania.
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Wzmocnienie podłoża gruntowego pod nasypami drogowymi
PublikacjaKoncepcja elastycznego podparcia nasypu i przyspieszenia konsolidacji podłoża. Prognoza osiadań w czasie na podstawie obliczeń metodą elementów skończonych, z uwzględnieniem w parametrach obliczeniowych przestrzennego charakteru zagadnienia. Przyspieszenie konsolidacji podłoża gruntowego pod nasypami za pomocą technologii mikro wybuchów i metody wgłębnej wibrowymiany. Porównanie wyników prognozowanych osiadań z osiadaniami pomierzonymi.
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[Komentarz do artykułu] Yin, W.-Y., Wu, B., Miao, M., Doi, L.B., Li, L.-W., and Kooi, P.-S.: Experimental characterisation and modelling of on-chip capacitors and resistors on GaAs substrates.
PublikacjaDokonano krytycznej oceny wartości elementów schematu zastępczego rezystorów monolitycznych wykonanych na podłożu GaAs przedstawionych w pracy: Yin, W.-Y., Wu, B., Miao, M., Doi, L.B., Li, L.-W., and Kooi, P.-S.: Experimental characterisation and modelling of on-chip capacitors and resistors on GaAs substrates, IEE Proc. Microw. Antennas and Propag., 2002,149, (1), pp.50-52.
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Interspecific distribution and co-associations of chemical elements in the liver tissue of marine mammals from the Polish Economical Exclusive Zone, Baltic Sea
PublikacjaPrzeprowadzono analizy próbek wątroby ssaków morskich z Polskiej Strefy Ekonomicznej Morza Bałtyckiego w celu oznaczenia szerokiej gamy pierwiastków (mikro- i makroelementy) z wykorzystaniem takich technik analitycznych jak ICP-MS, ICP-AES oraz CV-AAS.Badano zależności pomiędzy zawartością poszczególnych pierwiastków a wiekiem, płcią, miejscem bytowania, sposobem odżywiania i gatunkiem ssaków.
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Napawanie elementów wymiennika ciepła austenitycznym drutem proszkowym
PublikacjaNa potrzeby przemysłu energetycznego produkuje się wymienniki ciepła przeznaczone do eksploatacji w warunkach agresywnych chemicznie, np. w środowisku siarkowodoru. Z przyczyn ekonomicznych często stosuje się w takim przypadku materiały bimetaliczne wytwarzane procesami napawania. W artykule przedstawiono wyniki badań nieniszczących, pomiarów twardości, analizy składu chemicznego, pomiarów ferrytu delta oraz badań makro- i mikroskopowych...
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Leadership, culture, intellectual capital and knowledge processes for organizational innovativeness across industries: the case of Poland
PublikacjaPurpose – This study aims to present the overview of intellectual capital creation micro-mechanisms concerning formal and informal knowledge processes. The organizational culture, transformational leadership and innovativeness are also included in the investigation as ascendants and consequences of the focal relation of intellectual capital and knowledge processes. Design/methodology/approach – Based on a sample of 1,418 Polish...
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Wpływ parametrów obróbkowych na jakość powierzchni po toczeniu na twardo
PublikacjaW referacie przedstawiono wyniki analizy powierzchni po toczeniu na twardo, jako alternatywnej dla szlifowania. Przedstawiono wyniki z badań wpływu parametrów obróbkowych na dokładność wymiarowo kształtową ze szczególnym uwzględnieniem uzyskiwanej struktury geometrycznej powierzchni w skali mikro. Do analizy powierzchni wykorzystano profilogramy, krzywe udziału nośnego oraz wybrane parametry chropowatości i falistości powierzchni.
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Modelling of concrete behaviour in uniaxial compression and tension with DEM.
PublikacjaW artykule omowiono wyniki modelowania betonu podczas jednoosiowego sciskania i rozciagania stosujac metode elementów dyskretnych. Beton zostal opisany jako material 3-fazowy (kruszywo, zaprawa cementowa i strefy kontaktu). Szczegolna uwage zwrocono na zjawiska mikro-strukturalne na poziomie kruszywa (lancuchy sil, wiry, obroty ziaren). Wyniki numeryczne zostaly porownano z wynikami badan doswiadczalnych.
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Wytwarzanie i modyfikacja powierzchni porowatych struktur tytanowych przeznaczonych na implanty
PublikacjaCelem pracy było wytworzenie stopu Ti-13Nb-13Zr z wykorzystaniem technologii selektywnego topienia laserowego (SLM) oraz jego biofunkcjonalizacja za pomocą utleniania mikrołukowego (MAO), a następnie określenie wpływu parametrów procesowych na właściwości otrzymanych materiałów pod kątem ich zastosowania na implanty. Oceniono wpływ napięcia, natężenia i czasu procesu MAO przeprowadzanego w elektrolicie zawierającym wapń i fosfor...
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The Role of a Software Product Manager in Various Business Environments
PublikacjaThe aim of the paper is to identify the role of the software product manager depending on the size of the company and the characteristics of the product they are working on. This has been achieved in cooperation with 15 experts from the IT industry. The companies were divided into 4 levels of size: micro-enterprises, small businesses, medium businesses and large enterprises. The characteristics of the products were divided into...
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ELECTRON ATTACHMENT TO HETEROGENEOUS MOLECULAR CLUSTERS
PublikacjaHeterogeneous clusters are unique model species enabling studies of bulk and surface processes by vacuum restricted methods. This is of particular importance for the reactions of low-energy electrons which have extremely short penetration depth in bulk environments. This contribution overviews our recent experiments with low-energy electrons and clusters prepared by different techniques. First, the deposition of molecules on argon...
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Planning, Configuration and Usefulness of Microseismic Monitoring on Eastern-Europe Platform – Example from East Pomerania
PublikacjaThe microseismic monitoring is a method of monitoring of fracture propagation during hydraulic fracturing process. The method uses array of geophones to localize micro tremors induced by liquid pumped underground at high rate and pressure. The acquired information helps to optimize fracturing process and prevents fracture growth to aquifer levels. It proved to be useful on several unconventional hydrocarbon reservoirs in the USA....
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Comparative study of operation of condensing and traditional boilers equipped with the ORC module for electricity generation
PublikacjaCondensing technology applied to boilers is to make full use of thermal energy contained in the fuel. That means that additionaly the heat from condensation of exhaust gases can be used for the purposes of heating the domestic hot water and to cover the demand for central heating. The study analyzed the operation of the "traditional" boiler equipped with the ORC module as the similar arrangement but with the condensing boiler....
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Removal of Pharmaceutically Active Compounds in Sequencing Batch Reactor
PublikacjaIn recent years, considerable attention was paid to the presence of organic micro-pollutants such as Active Pharmaceutical Ingredients (API) in the aquatic environment due to their negative impact on public health and aquatic ecosystems. Numerous papers have pointed out API presence as common constituents of effluents from Wastewater Treatment Plants (WWTPs). This is the result of various efficiencies of API removal by conventional...
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Influence of anisotropic stiffness in numerical analyses of tunneling and excavation problems in stiff soils
PublikacjaIn the stiff overconsolidated soil deposits anisotropy influences small and intermediate strain stiffness and hence it has important impact on the results of discplacement preditcions in soil-structure modelling. The authors developed a cross-anisotropic soil model which combines both stress dependent and micro-structural anisotropy. The model is based on the anisotropic hyperelastic kernel for small strain stiffness. Reference...
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Effect of plasma sprayed and laser re-melted Al2O3 coatings on hardness and wear properties of stainless steel
PublikacjaCommercially available austenic stainless steel substrate was coated with commercially available, raw Al2O3 powder applied by means of plasma spraying method and then re-melted with CO2 laser beam of various parameters. Tribological and mechanical properties of the 120 J/mm and 160 J/mm laser re-melted coatings were compared with the tribological and mechanical properties of the “as-sprayed” coating. The influence of the laser...