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Search results for: freeze-thaw processes
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Influence of the Adsorption Bed Composition on the Low-Pressure Fluidization
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Analysis of the Sieve Unit Inclination Angle in the Cleaning Process of Oat Grain in a Rotary Cleaning Device
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Application of Raman Spectroscopy to Evaluate the Structure Changes of Lubricating Grease Modified with Montmorillonite after Tribological Tests
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Application of Generalized Regression Neural Network and Gaussian Process Regression for Modelling Hybrid Micro-Electric Discharge Machining: A Comparative Study
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Thermal Biomass Conversion: A Review
PublicationIn this paper, the most important methods of thermal conversion of biomass, such as: hydrothermal carbonization (180–250 °C), torrefaction (200–300 °C), slow pyrolysis (carbonization) (300–450 °C), fast pyrolysis (500–800 °C), gasification (800–1000 °C), supercritical steam gasification, high temperature steam gasification (>1000 °C) and combustion, were gathered, compared and ranked according to increasing temperature. A comprehensive...
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Evaluation of Immobilization of Selected Peat-Isolated Yeast Strains of the Species Candida albicans and Candida subhashii on the Surface of Artificial Support Materials Used for Biotrickling Filtration
PublicationThe paper describes the process of n-butanol abatement by unicellular fungi, able to deplete n-butanol content in gas, by using n-butanol as source of carbon. Isolated and identified fungi species Candida albicans and Candida subhashii were subjected to a viability process via assimilation of carbon from hydrophilic and hydrophobic compounds. The isolates, which exhibited the ability to assimilate carbon, were immobilized on four...
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Simultaneous Removal of Al, Cu and Zn Ions from Aqueous Solutions Using Ion and Precipitate Flotation Methods
PublicationThis paper presents the results of investigations concerning the simultaneous removal of Al(III), Cu(II), and Zn(II) from dilute aqueous solutions using ion and precipitate flotation methods. The effects of initial solution pH, surface active substance concentration, and the gas velocity on the flotations’ efficiency and course are studied. Experimental results are discussed in terms of physicochemical aspects related to aqueous...
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Biomass-Derived Nitrogen Functionalized Carbon Nanodots and Their Anti-Biofouling Properties
PublicationThe prevalence of the antibiotic resistant bacteria remains a global issue. Cheap, sustainable and multifunctional antibacterial membranes are at the forefront of filtrating materials capable of treating multiple flow streams, such as water cleansing treatments. Carbon nanomaterials are particularly interesting objects shown to enhance antibacterial properties of composite materials. In this article, amino-functionalized, photoluminescent...
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Maximizing Bio-Hydrogen and Energy Yields Obtained in a Self-Fermented Anaerobic Bioreactor by Screening of Different Sewage Sludge Pretreatment Methods
PublicationEgypt faces significant challenges in managing its sewage sludge generated in large quantities from wastewater treatment plants. This study investigates the feasibility of utilizing sewage sludge as a renewable resource for hydrogen production through anaerobic digestion at the 100 L bioreactor level. Hydrogen is considered a promising alternative energy source due to its high energy content and environmental benefits. To optimize...
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Multi-parameter dataset on limnological variables and modern sedimentation at Lake Żabińskie, northeast Poland, 2012-2021
Open Research DataThe dataset presents the results of a decade-long investigations of limnological processes and sedimentation at Lake Żabińskie located in northeast Poland. We collected a wide range of information on the lake water physical and chemical characteristics, modern sedimentation dynamics, and hydrochemistry of incoming streams and outflow from the lake....
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In-situ generation of Ag, Cd, Hg, In, Pb, Tl and Zn volatile species by flowing liquid anode atmospheric pressure glow discharge operated in gaseous jet mode – Evaluation of excitation processes and analytical performance
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SEM pictures - biomass
Open Research DataThe dataset contains SEM pictures catching the changes occurring in biomass structures when the biomass undergoes pre-treatment processes.
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Determination of denaturation temperature of connective tissue proteins by viscometric measurements.
Open Research DataViscometric denaturation temperature of connective tissue proteins was determined by measuring viscosity with a Brookfield viscometer, using a LV SC4 - 18, 25 or LV3 spindle and shear rates from 50 to 110 s-1 (Fig.1). Freeze-dried protein samples were dissolved in 0.5 M acetic acid at 4 °C and concentration of 20 mg/mL. The solution was stirred with...
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Progressing Pollutant Elution from Snowpack and Evolution of its Physicochemical Properties During Melting Period— a Case Study From the Sudetes, Poland
PublicationMain aim of the work assumed recognition of physicochemical changes in snowpack occurring during the melting period. Properties of snow cover had been identified at two sites in Western Sudetes mountains (860 and 1228 m asl) in SW Poland since the end of January, and monitored until the disappearance of snow in late Spring. Snow pit measurements and sample collection at both sites were made followed by chemical analyses with the...
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Jerzy Kowalski dr hab. inż.
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Mercury intrusion porosimetry (MIP) results of cement pastes containing iron oxide (Fe3O4) nanoparticles (nanomagnetite)
Open Research DataMercury intrusion porosimetry (MIP) data - curves of cement pastes containing iron oxide (Fe3O4) nanoparticles (nanomagnetite) in *.opju (Origin) format.
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Wastewater Engineering 2020/21 (Environmental Engineering, II stopnia, stacjonarne, II semestr))
e-Learning CoursesWastewater sources and flows Wastewater characterization based on physical and biodegradation criteria Preliminary treatment unit operations (screens, grit chambers, primary clarifiers) Biological processes (suspended growth vs. attached growth, hybrid systems, granular sludge) for wastewater treatment. Principles of biological nutrient removal (nitrification, denitrification, enhanced biological P removal, anammox). Implementation...
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Wastewater Engineering 2021/22 (Environmental Engineering, II stopnia, stacjonarne, II semestr))
e-Learning CoursesWastewater sources and flows Wastewater characterization based on physical and biodegradation criteria Preliminary treatment unit operations (screens, grit chambers, primary clarifiers) Biological processes (suspended growth vs. attached growth, hybrid systems, granular sludge) for wastewater treatment Principles of biological nutrient removal (nitrification, denitrification, enhanced biological P removal, anammox) Implementation...
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Wastewater Engineering 2022/23 (Environmental Engineering, II stopnia, stacjonarne, II semestr))
e-Learning CoursesWastewater sources and flows Wastewater characterization based on physical and biodegradation criteria Preliminary treatment unit operations (screens, grit chambers, primary clarifiers) Biological processes (suspended growth vs. attached growth, hybrid systems, granular sludge) for wastewater treatment Principles of biological nutrient removal (nitrification, denitrification, enhanced biological P removal, anammox) Implementation...
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Wastewater Engineering 2023/24 (Environmental Engineering, II stopnia, stacjonarne, II semestr)
e-Learning CoursesWastewater sources and flows Wastewater characterization based on physical and biodegradation criteria Preliminary treatment unit operations (screens, grit chambers, primary clarifiers) Biological processes (suspended growth vs. attached growth, hybrid systems, granular sludge) for wastewater treatment Principles of biological nutrient removal (nitrification, denitrification, enhanced biological P removal, anammox) Implementation...
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Sval-POPs Spatial VAriabiLity: VALidation dataset on POPs concentrations in snow
ProjectsProject realized in Faculty of Chemistry according to 2018_0009 agreement
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Karol Flisikowski dr inż.
PeopleKarol Flisikowski works as Associate Professor at the Department of Statistics and Econometrics, Faculty of Management and Economics, Gdansk University of Technology. He is responsible for teaching descriptive and mathematical statistics (in Polish and English), as well as scientific research in the field of social statistics. He has been a participant in many national and international conferences, where he has presented the results...
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Technological effect comparison of abrasive and plastic working. Production Processes and Systems**2002 vol. 1 s. 89-98, 9 rys. 2 tabl. bibliogr. 6 poz Publication of the University of Miskolc. Porównanie technologicznych efektów obróbki ściernej i plastycznej.
PublicationPrzedstawiono wyniki badań porównawczych próbek obrobionych wykańczająco przez szlifowanie i docieranie oraz przez powierzchniową obróbkę plastyczną przez nagniatanie ślizgowe. Podano także konstrukcje narzędzi i przykłady stosowania badanych metod obróbki.
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Reemission of inorganic pollution from permafrost? A freshwater hydrochemistry study in the lower Kolyma basin (North-East Siberia)
PublicationPermafrost regions are under particular pressure from climate change resulting in widespread landscape changes, which impact also freshwater chemistry. We investi- gated a snapshot of hydrochemistry in various freshwater environments in the lower Kolyma river basin (North-East Siberia, continuous permafrost zone) to explore the mobility of metals, metalloids and non-metals resulting from permafrost thaw. Partic- ular attention...
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International Conference on Software and System Processes (International Conference of Software and Systems Process (was ICSP prior to 2011))
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Roofing Materials as Pollution Emiters - Concentration Changes During Runoff
PublicationThe influence of roofing material on concentration of pollutants in roof runoff waters and changes of pollution concentration in time were investigated. In field studies four roofing material types were taken into consideration - ceramic tile, bituminous membrane, asbestos tile and zinc sheeting. Samples were collected since November 2007 to March 2008, anions, cations, metals, PAHs, pesticides and PCB were determined. The existence...
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Milena Marycz dr inż.
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Krzysztof Goczyła prof. dr hab. inż.
PeopleKrzysztof Goczyła, full professor of Gdańsk University of Technology, computer scientist, a specialist in software engineering, knowledge engineering and databases. He graduated from the Faculty of Electronics Technical University of Gdansk in 1976 with a degree in electronic engineering, specializing in automation. Since then he has been working at Gdańsk University of Technology. In 1982 he obtained a doctorate in computer science...
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Employment structure in business services centers broken down into supported process categories.
Open Research DataThe structure of business services provided in centers in Poland is highly diversified, however, the vast majority of entities provide services in several categories of business processes. IT activities and financial and accounting (F&A) services together generate slightly more than half of employment in the industry (51%). Customer Operations (14%)...
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Sorption of ammonia nitrogen and phosphate phosphorous by straw and wood-derived biochars
Open Research DataThis dataset comprises the results of NH4-N and PO4-P sorption kinetics using straw and wood biochars that were pyrolyzed at 450 degrees Celsius. The adsorption capacity (mg/g) and equilibrium concentration (mg/L) are calculated.
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Microscopic examination of the texture of paper products
Open Research DataAtomic force microscopy (AFM) can be used to study the state of the paper fibers with the aim of providing qualitative and semi-quantitative information on degradation and aging. The work [1] reports the results of tests of various paper products subjected to deliberate aging processes under the influence of various factors. Chemical and biological...
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Nutrient removal in municipal wastewater treatment
e-Learning CoursesThis series of lectures and interactive teaching sessions will cover all the important aspects of nutrient removal in municipal wastewater treatment. There will be five sessions. The topics of the sessions are: 1) Nutrient removal – why, how and what has been achieved?; 2) Biological treatment processes and conventional nitrogen removal; 3) Shortcut nitrogen removal processes and climate implication of nitrogen removal; 4) Biological...
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Separation techniques
e-Learning CoursesSeparation techniques in modern chemical analysis form the basis of most compound separation and identification processes. Their task is to selectively isolate elements or chemical substances from complex mixtures and thus determine their type and quantity. In addition to analytical applications, separation techniques are now also used in preparative processes to isolate large quantities of individual substances. The course will...
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Integration of Production Steps on a Single Equipment
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Manufacture of photovoltaic cells with hybrid organic–inorganic bulk heterojunction
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Production of antimicrobial silver nanoparticles modified by alkanethiol self‐assembled monolayers by direct current atmospheric pressure glow discharge generated in contact with a flowing liquid anode
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Direct Current Atmospheric Pressure Microdischarge Generated between a Miniature Flow Helium Microjet and a Flowing Liquid Cathode
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Decolorization of organic dyes solution by atmospheric pressure glow discharge system working in a liquid flow-through mode
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Direct current atmospheric pressure glow discharge generated between a pin-type solid cathode and a flowing liquid anode as a new tool for silver nanoparticles production
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The influence of the cooling conditions on the cutting tool wear and the chip formation mechanism
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Experimental research of the effect of face milling strategy on the flatness deviations
PublicationIn this paper the dependencies between face milling strategy of EN AW6082-T6 aluminum alloy samples, with difference thicknesses (6, 8, and 12 mm) and two cold rolling directions, and flatness deviations were presented. Three strategies of milling included different proportions of material removed from both sides of the plates. This approach allowed to control the proportions of residual surface stresses on both sides of the specimens,...
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Powder metallurgy of the porous Ti-13Nb-13Zr alloy of different powder grain size
PublicationThe objective of the present project was to determine the effects of powder granulation (fraction of grain size) for the Ti-13Nb-13Zr alloy, produced by powder metallurgy, on its porosity, grain cohesion, compressive strength, and Young`s modulus. Two powder fractions, 45–105 µm, and 106–250 µm were applied. The 50 mass pct of NH4HCO3 was added as a space holder. The specimens were in compaction stage uniaxially pressed at pressure...
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Beta-galactosidase activity of Meiothermus ruber cells
PublicationFreeze-dried cells of Meiothermus ruber catalyses cleavage of o-nitrophenyl-b-D-galactopiranoside (oNPb-gal) and conversion of lactose into glucose and galactose. The permeabilization with 2%toluene,20%ethanol and 20%acetone increased enzymatic activity from 74.87 U/g of lyophilized cells up to 129.44,114.38 and 90.19 U/g,respectively. Ethanol was an effective permeabilizing agent and its efficiency was dependent on the concentration,...
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Production of certified reference materials - homogeneity and stability study based on the determination of total mercury and methylmercury
PublicationReference materials (RMs) play an important role in all elements of the quality assurance system of measurements. In this work, ``package'' 4 new CRMs (bottom sediment, herring tissue, cod tissue, cormorant tissue) were prepared and characterised to carry out the quality control in monitoring analysis of mercury and methylmercury in environmental samples. Materials - candidates were collected in Poland and south part of the Czech...
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Electrical and noise responses of graphene back-gated field-effect transistors enhanced by UV light for organic vapors sensing
Open Research DataBack-gated field-effect transistors with graphene channels (GFETs) were investigated toward organic vapors sensing. Two methods were used for sensing experiments including DC characteristics measurements and fluctuation-enhanced sensing by low-frequency noise studies. The data set consists of raw and modified data on GFET responses to acetonitrile,...
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The fertility rate (TFR) in selected EU countries in 2015
Open Research DataThe main reasons for the negative consequences of demographic changes are: natural increase in the life span of the population, decline in fertility and emigration of unusual dimensions.
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Radosław Drozd dr inż.
PeopleRadosław Drozd - Practice and long-time manager of engineering management and engineering logistics. He graduated from the Faculty of Management and Economics of the PG in the specialty of Production Systems Organization. His scientific and research interests include the design and improvement of production and logistics systems, as well as the development of innovative products. By participating or conducting projects in many...
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Marzena Starnawska dr
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The OpenMolcas Web: A Community-Driven Approach to Advancing Computational Chemistry
Open Research DataThe developments of the open-source OpenMolcas chemistry software environment since spring 2020 are described, with a focus on novel functionalities accessible in the stable branch of the package or via interfaces with other packages. These developments span a wide range of topics in computational chemistry and are presented in thematic sections: electronic...
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Cyclic voltammetry curves for FTO/PANI:WO3 nanocomposite
Open Research DataThis dataset contains the results of kinetic electrochemical studies, carried out with cyclic voltammetry (CV) of FTO/PANI:WO3 nanocomposite at various scan rates: 10, 20, 50, 75, 100 and 200 mV/s. The electrolyte was 1M H2SO4 solution. The measurements were performed in a three electrode setup, and with Ag|AgCl|3M KCl as the reference electrode and...