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Open water experiments with two pod propulsor models.
PublikacjaReferat przedstawia obszerne eksperymenty hydromechaniczne z dwoma modelami pędników podowych. Jeden z nich jest pędnikiem pchającym o średnicy 0,32 m, drugi pędnikiem ciągnącym o średnicy 0,25 m. W trakcie pomiarów ustalono przebieg sześciu składowych siły i momentu hydrodynamicznego dla szerokiego zakresu zmian współczynnika posuwu i kąta dryfu.
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Modeling of unsaturated water flow in highly heterogeneous soils.
PublikacjaTematem pracy jest modelowanie przepływu wody w gruntach nienasyconych o podwójnej porowatości, które charakteryzują się obecnością dwóch podobszarów porowatych o skontrastowanych parametrach hydraulicznych. Jako punkt wyjścia przyjęto, że w skali lokalnej przepływ w obu podobszarach jest opisany równaniem Richardsa. Przedstawiono wyprowadzenie dwóch modeli przepływu w skali makroskopowej przy użyciu metody homogenizacji asymptotycznej....
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Environmental reliability model of a bilge water purifying installation
PublikacjaW referacie przedstawiono probabilistyczny model, służący do wyznaczania niezawodności środowiskowej instalacji oczyszczania wód zęzowych z zanieczyszczeń olejowych. Jest to model przyczynowo - skutkowy. Struktura modelu ma formę drzewa zdarzeń i odpowiednich drzew niezdatności. Niezawodność środowiskowa instalacji zdefiniowana została jako prawdopodobieństwo, że w wyniku jej eksploatacji nie nastąpi zagrożenie dla środowiska morskiego....
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Numerical simulation of water drainage in double-porosity soils
PublikacjaArtykuł dotyczy modelowania przepływu wody w warunkach nienasyconych w gruntach o podwójnej porowatości, które są złożone z dwóch materiałów porowatych o bardzo różnych parametrach. przepływ w takich ośrodkach często charakteryzuje się powstawaniem lokalnych gradientów ciśnienia między obszarami dobrze isłaboprzepuszczalnymi.Przedstawiono matematyczny model przepływu wody w gruncie w strefie nienasyconej. Przepływ odbywa się w...
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Korozja rur ciepłowniczych = Heat water tubes corrosion
PublikacjaZbadano uszkodzenia korozyjne instalacji ciepłowniczej w aspekcie jakości rur zgrzewanych i korozyjności wody sieciowej. Rury przewodowe ze stali niskowęglowej zostały zniszczone przez korozję wżerową/podosadową zlokalizowaną w obszarze połączenia zgrzewanego wskutek nieodpowiedniej jakości wody.
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Virtual spring damper method for nonholonomic robotic swarm self-organization and leader following
PublikacjaIn this paper, we demonstrate a method for self-organization and leader following of nonholonomic robotic swarm based on spring damper mesh. By self-organization of swarm robots we mean the emergence of order in a swarm as the result of interactions among the single robots. In other words the self-organization of swarm robots mimics some natural behavior of social animals like ants among others. The dynamics of two-wheel robot...
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Histological Features of Neovaginal Epithelium after Vaginoplasty in Mayer-Rokitansky-Küster-Hauser Syndrome
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Harder Won and Easier Lost? Testing the Double Standard in Gender Rules in 62 Countries
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Control of the bridge span vibration with high coefficient passive damper. Theoretical consideration and application
PublikacjaThe research was carried out due to the problem of vibration on the lively pedestrian drawbridge across the Motlawa River in the city of Gdansk. In the design stage, the main span of the footbridge showed unfavorable dynamic properties, which may create a comfort problem for pedestrians. The first vertical bending eigenfrequency was recognized as 1.64 Hz. The original design of the footbridge was equipped with a driving cylinder...
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Investigation of the Efficiency of a Dual-Fuel Gas Turbine Combustion Chamber with a Plasma‒Chemical Element
PublikacjaThe study is devoted to the possibility of increasing the efficiency of the working process in dual-fuel combustion chambers of gas turbine engines for FPSO vessels. For the first time, it is proposed to use the advantages of plasma‒chemical intensification of the combustion of hydrocarbon fuels in the dual-fuel combustion chambers, which can simultaneously operate on gaseous and liquid fuels. A design scheme of a combustion chamber...
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The Novel Findings About the Hussite’s Warfares in the Gdansk/Danzig Surrounding in the Late Summer of 1433
PublikacjaOne of the most spectacular episodes during the Hussite Wars was the Czech raid through the lands of the Teutonic Order up to the Baltic Sea in 1433. Although historians and then-witnesses focused on the sacked Cistercian Abbey in Oliva and soldiers filling the bottles with seawater, the scale of damages in the main harbour of Prussia and its surroundings has not been the subject of research yet. Furthermore, most scholars treatthe...
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Anisotropy and compaction gradient assessment on rammed earth specimens through sonic tomography approach
PublikacjaRammed earth is a traditional construction technique that has recently gained attention because of its benefits from an ecological perspective. The conservation of the existing valuable cultural heritage sites and the quality control of new constructions built with this material require the development and application of practical inspection techniques. This paper explores the application of sonic tests and sonic tomography as...
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Anode supported single chamber solid oxide fuel cell in CH4-Air Mixture.
PublikacjaW tej pracy przedstawiono wyniki prac ogniw paliwowych na bazie elektrolitu z tlenku cyrkonu stabilizowanego itrem o grubości 1-2um wytworzonego na podłożu cermetu z tlenku niklu i tlenku cyrkonu stabilizowanego itrem. LSCF był wykorzystany jako katoda. Ogniwo paliwowe było testowane w konfiguracji jednokomorowej w mieszaninie powietrza i metanu. Uzyskano napięcie o wartości 0.8V, zaś moc wynosiła 0.12W/cm2. Zbdadano wpływ przepływu...
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Effect of cathode materials on the performance of single chamber solid oxide fuel cell and module
PublikacjaW pracy przedstawiono wyniki badań nad jednokomorowym ogniwem paliwowym. Badane były ogniwa przygotowane z różnymi rodzajami materiałow katodowych oraz określana była wydajność ogniwa. Zbudowano i zbadano moduł ogniwa paliwowego jednokomorowego.
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Quality of bottled waters
PublikacjaBottled water is a product that is purchased by annually increasing numbers of people of all age groups. The quality control of mineral waters tends to concentrate on the determination of anion and cation levels, since it is these that govern the taste, smell and possible medicinal properties of the water. The constantly rising sales of mineral waters bring with them the ever increasing exploitation of their sources. The consequences...
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System monitoringu pomieszczeń zamkniętych oparty na zespole kamer internetowych
PublikacjaArtykuł opisuje system do monitoringu pomieszczeń zamkniętych oparty na zespole kamer internetowych. System umożliwia rejestrację obrazu za pomocą trzech kamer internetowych w momencie wykrycia ruchu i przekazuje w czasie rzeczywistym nagrany film użytkownikowi na dowolne urządzenie posiadające system Android. Dzięki takiemu rozwiązaniu można kontrolować dane pomieszczenie np. pokój dziecka, biuro czy też sklep. Umożliwia to podjęcie...
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Heavy Metals in Waters and Sediments of Rivers Affected by Brown Coal Mine Waters
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Multiprocessor Implementation of Parallel Multiobjective Genetic Algorithm for Optimized Allocation of Chlorination Stations in Drinking Water Distribution System a New Water Quality Model Approach
PublikacjaThe Critical Infrastructure Systems (CISs) have received in recent years a considerable attention due to their heavy impact on sustainable development of modern societies. Most CISs may be classied as large scale complex systems of network structure, in uenced by strong interactions form the surrounding environment, internal and external interconnections. The later is a result of inter-CIS dependencies. The control, monitoring...
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Wpływ warunków hydraulicznych w sieci wodociągowej na wtórne zanieczyszczenie wody = Effect of hydraulic conditions in the water distribution system on the secondary water pollution
PublikacjaCelem badań jest próba empirycznego wykazania wpływu zmian prędkości i czasu przebywania wody w przewymiarowanej sieci wodociągowej na wtórne jej zanieczyszczenie. Podstawą analizy są pomiary hydrauliczne wykonane podczas realizacji płukania rurociągów żeliwnych D=100 mm oraz badania laboratoryjne popłuczyn w zakresie suchej pozostałości, w tym zawartości związków żelaza. Każdą pobraną próbkę popłuczyn z hydrantów poddano szczegółowej...
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Multiprocessor implementation of Parallel Multiobjective Genetic Algorithm for Optimized Allocation of Chlorination Stations in Drinking Water Distribution System - a new water quality model approach
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A small-signal sound speed and parameter of non-linearity B/Ain a ternary mixture. Examples of calculations of mixture consisting of air, water and water vapor
PublikacjaZostało wyliczone zaburzenie entropii z dokładnością do członów nieliniowych rzędu drugiego. Jedyne założenie ograniczające, toże para wodna i powietrze są gazami doskonałymi. Ostatecznie,parametr nieliniowości i prędkość fali akustycznej przedstawione jako rodzinę krzywych, zależnych od trzech parametrów. Przedstawiono ilustrację tych zależności.
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Deviations of treeline Norway spruce radial growth from summer temperatures in East-Central Europe
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INVESTIGATION OF THE CHARACTERISTICS OF A LOWEMISSION GAS TURBINE COMBUSTION CHAMBER OPERATING ON A MIXTURE OF NATURAL GAS AND HYDROGEN
PublikacjaT his article is devoted to the investigation of the characteristics of a low-emission gas turbine combustion chamber, which can be used in Floating Production, Storage and Offloading (FPSO) vessels and operates on a mixture of natural gas and hydrogen. A new approach is proposed for modelling the processes of burning out a mixture of natural gas with hydrogen under preliminary mixing conditions in gaseous fuel with an oxidizer...
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Improvement of Performance Level of Steel Moment-Resisting Frames Using Tuned Mass Damper System
PublikacjaIn this paper, parameters of the tuned mass dampers are optimized to improve the performance level of steel structures during earthquakes. In this regard, a six-story steel frame is modeled using a concentrated plasticity method. Then, the optimum parameters of the Tuned Mass Damper (TMD) are determined by minimizing the maximum drift ratio of the stories. The performance level of the structure is also forced to be located in a...
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Performance of a plate heat exchanger operated with water-Al2O3 nanofluid
PublikacjaThis study is focused on experimental investigation of a selected type of brazed plate heat exchanger (PHEx). The main aim of the paper was to experimentally check the ability of nanofluids to enhance the performance of PHEx. A typical water-Al2O3 nanofluid was tested and compared to that of the base fluid, i.e. water. Nanoparticles were tested at the concentration of 0.1% and 1% by weight. Impact of the 1 day and 3 days break...
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Study of Cloud Water Samples Collected over Northern Poland
PublikacjaThe paper gives the results of the first studies on the chemistry of cloud water collected during 3 mo (Aug.–Oct. 2010) in the free atmosphere over the area to the south of the Tri-City (Gdansk-Sopot-Gdynia) conurbation on the Gulf of Gdansk, Poland. Taken from cumulus, stratus, and stratocumulus clouds by means of an aircraft-mounted collector, the water samples were analyzed for the following contaminants: anions (chlorides,...
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The protection and monitoring of a distribution piping network for potable water supply
PublikacjaPurpose – The purpose of this paper is to implement the corrosion protection method for steel pipes used in a municipal water-pipe network. Results of an inhibitor protection system installed on the system are presented. Inhibitor protection was required due to the high corrosivity of the water collected by a surface intake, which had resulted in a large number of failures and low water quality, due to the presence of corrosion...
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Performance of a plate heat exchanger operated with water-Al2O3 nanofluid
PublikacjaThis study is focused on experimental investigation of a selected type of brazed plate heat exchanger (PHEx). The main aim of the paper was to experimentally check the ability of nanofluids to enhance the performance of PHEx. A typical water-Al2O3 nanofluid was tested and compared to that of the base fluid, i.e. water. Nanoparticles were tested at the concentration of 0.1% and 1% by weight. Impact of the 1 day and 3 days break...
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Static Model of Steam/Water Cycle for Thermal and Economic Analysis
PublikacjaThe thermodynamic efficiency of typical conventional and nuclear power plants is insufficient. A large amount of the generated heat is removed to the environment and regarded as a waste. A solution which is commonly used to increase the efficiency and profitability of the existing and planned power plants refers to cogeneration of heat and power. To prepare sophisticated thermodynamic and economic analyses, a precise static model...
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Dynamic state assessment of the water turbine with the power of 600 kW
PublikacjaThe article discusses the results of experimental studies to assess the dynamic state of the turbine set with the Kaplan turbine. The dynamic assessment was made on the basis of appropriate standards, based on the measurement results of selected parameters of vibration, which have been measured for several states of the machine load. In addition, we attempted to identify the causes of the increased vibration levels based on the...
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Perturbation analysis of electric field around objects in sea water
PublikacjaThe paper presents an analytical approach to the perturbation analysis of electric field distribution caused by a sphere and an ellipsoid placed in a uniform electric field.
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Distribution of volatile organohalogen compounds in petrochemical plant water streams
PublikacjaThe study assesses halogenated volatile organic compound concentrations in the water and wastewaterstreams of a petrochemical plant. Water samples were collected at 11 sampling points during 5 samplingcampaigns. The samples were collected from the oil dewaxing unit and in the wastewater treatmentplant. Dichloromethane and 1,2-dichloroethane were the most frequently determined compounds. Tetrachloroethenewas also detected at the...
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FAILURE OF MAGNETIC FLUID SEALS OPERATING IN WATER: PRELIMINARY CONCLUSIONS
PublikacjaThe article analyses properties of magnetic fluid seals installed in rotary sealing no des which operate in the utility water environment. Seals of this type have been examined as a possible solution to the problem with ship manoeuvring propulsion sealing. The present analysis bases on laboratory durability tests of magnetic fluid seals expo sed to long - term utility water loads, at different water pressures and shaft revolutions....
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Numerical modal analysis of a vertical rising steel water gate
PublikacjaVertical rising steel water gates are very common not only in Poland and Germany but also in other countries of the world. Their popularity is mainly attributed to their simplicity of construction, which makes their production process cheaper and faster when compared to other solutions. The aim of this paper is to conduct a numerical modal analysis to examine the eigenvalues and eigenmodes of a vertical rising steel gate. Two cases...
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Numerical Simulations of Hydrodynamic Open-Water Characteristics of a Ship Propeller
PublikacjaThe paper presents the results of numerical simulations of ship propeller operation bearing the name of Propeller Open Water (POW) Tests. The object of tests was a sample ship propeller (PPTC1), the geometrical and kinematic data of which are available, along with the results of model tests, on the official page of the research centre involved in the measurements. The research aimed at verifying the correctness of results of numerical...
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THE STUDY OF WATER POLLUTION OF THE LOWER VISTULA RIVER BY PLASTIC PARTICLES
PublikacjaSince the beginning of widespread use of plastic its consumption and production has been constantly increasing. As a result of human activity part of waste ends up in our environment and is deposited in each of the elements of the biosphere. These impurities can be in the form of large elements, small particles fragmented to macroscopic level (pellets, facial scrub grains) and the microparticles visible under a microscope. Particularly...
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Durability of Asphalt Concrete Subjected to Deteriorating Effects of Water and Frost
PublikacjaThe paper presents testing of the detrimental effects of water and frost on asphalt pavements. It included laboratory testing of 5 fatigue life of asphalt concrete that was subjected to action of water and frost and field testing of damages caused by water and frost on 6 existing asphalt pavements, such as stripping, raveling, and potholes. Laboratory simulation of water and frost action was based on the 7 original AASHTO T283...
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Performance of the PVT solar collector operated with water-Al2O3 nanofluid
PublikacjaAn experimental investigation of the hybrid module photovoltaic panel -solar collector (PVT) cooled by water-Al2O3 nanofluids has been conducted. The weight fractions of the nanoparticles were 1% and 3%. Thermal efficiency, power efficiency and overall efficiency have been determined for artificial source of light and sunlight. No noticeable effect of the nanoparticle concentration on the overall efficiency of the PVT module has...
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Analysis of hydrodynamic pressure fields of motorboats and pontoons in shallow water
PublikacjaThe article presents the results of calculations of the pressure fields generated by a motorboat at the bottom of a shallow sea. Calculations were made using the boundary elements method (BEM), arranged on the surface of the boat and the bottom of the sea. This method is described in [3], and applied on a free surface linearized boundary condition. Results for four different lengths of motorboats, from 2.85 m to 9.5 m, sea depth...
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Experiencing historic waterways and water landscapes of the Vistula River Delta
PublikacjaThe paper gives insights into the characteristics of Vistula River Delta water landscapes, referring to the process of creating land out of water by Polish, Dutch and German settlers. Based on this, the paper presents an integrated strategy formed upon studies in cultural geography and aesthetics, and focused on enhancing the unique characteristics of the region and its rediscovery by tourism. The long process of constructing Vistula...
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THE 3D MODEL OF WATER SUPPLY NETWORK WITH APPLICATION OF THE ELEVATION DATA
Publikacja3D visualization is a key element of research and analysis and as the source used by experts in various fields e.g.: experts from water and sewage systems. The aim of this study was to visualize in three-dimensional space model of water supply network with relief. The path of technological development of GESUT data (Geodezyjna Ewidencja Sieci Uzbrojenia Terenu – geodetic records of public utilities) for water supply and measurement...
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Unusual Influence of Fluorinated Anions on the Stretching Vibrations of Liquid Water
PublikacjaInfrared (IR) spectroscopy is a commonly used and invaluable tool in the studies of solvation phenomena in aqueous solutions. Concurrently, ab initio molecular dynamics (AIMD) simulations deliver the solvation shell picture at a molecular detail level and allow for a consistent decomposition of the theoretical IR spectrum into underlying spatial correlations. Here, we demonstrate how the novel spectral decomposition techniques...
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Testing OFDM Transmission Schemes for Shallow Water Acoustic Communications
PublikacjaLarge variability of communication properties of underwater acoustic channels, and especially strongly varying instantaneous conditions in shallow waters, is a tough challenge for the designers of underwater acoustics communication (UAC system. There is a need for developing adaptive signaling schemes that would dynamically optimize signal parameters in both physical and link layers of communication protocols. The orthogonal frequency...
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Research into the Movements of Surface Water Masses in the Basins Adjacent to the Port
PublikacjaThis paper presents the results of the practical and simulation research into determining the routes of movement of small objects moving together with surface water masses in basins adjacent to the port. The results of this research were referenced against the modelling of routes of small objects in port channel basins. The results of practical research concerning the movement of small objects in basins adjacent to the port were...
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Bioaugmentation of a sequencing batch reactor with Archaea for the treatment of reject water
PublikacjaIn this study, the bioaugmentation of a sequencing batch reactor (SBR) for the treatment of reject water from wastewater treatment plant was evaluated. For the bioaugmentation step a product containing an enrichment of microorganisms from the Archaea domain was used to enhance the performance of the reactor for treating reject water. The experiment was carried out in two parallel lab-scale sequencing batch reactors. The first one...
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Temper bead welding of S420G2+M steel in water environment
PublikacjaThe article presents the idea of the use of Temper Bead Welding (TBW) technique to improve the weldability of high strength steel at underwater wet welding conditions. Wet welding method with the use of covered electrodes is described. This work shows results of metallographic examinations and hardness measurements of samples of S420G2+M steel with weld beads performed under water. It has been shown that Temper Bead Welding technique...
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PERFORMANCE OF THE PVT SOLAR COLLECTOR OPERATED WITH WATER –AL2O3 NANOFLUID
PublikacjaAn experimental investigation of the hybrid module photovoltaic panel -solar collector (PVT) cooled by water-Al2O3 nanofluids has been conducted. The weight fractions of the nanoparticles were 1% and 3%. Thermal efficiency, power efficiency and overall efficiency have been determined for artificial source of light and sunlight. No noticeable effect of the nanoparticle concentration on the overall efficiency of the PVT module has...
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The influence of water and mineral oil on volumetric losses in a hydraulic motor
PublikacjaIn this paper volumetric losses in hydraulic motor supplied with water and mineral oil (two liquids having significantly different viscosity and lubricating properties) are described and comparison. The experimental tests were conducted using an innovative hydraulic satellite motor, that is dedicated to work with different liquid, including water. The sources of leaks in this motor are characterized and described also. On this...
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Analysis of water erosion processes using terrestrial laser scanning
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Ozone and Photocatalytic Processes for Pathogens Removal from Water: A Review
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