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Ultrasound-Assisted Solvent Extraction of a Porous Membrane Packed Sample for the Determination of Tobacco-Specific Nitrosamines in the Replacement Liquids for E-Cigarettes
PublicationThe content of tobacco-specific nitrosamines (TSNAs) possessing carcinogenic properties has been an important area of research since replacement liquids were introduced for e-cigarettes. A method for determining N′-nitrosonornicotine (NNN), 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK), N′-nitrosoanatabine (NAT), and N′-nitrosoanabasine (NAB) in replacement liquids for electronic cigarettes was developed using liquid chromatography–tandem...
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Fast, sensitive and reliable multi-residue method for routine determination of 34 pesticides from various chemical groups in water samples by using dispersive liquid – liquid microextraction coupled with gas chromatography – mass spectrometry
PublicationA simple and efficient dispersive liquid-liquid microextraction technique (DLLME) was developed by using a mixture of two solvents: 40 μL of tetrachlorethylene (extraction solvent) and 1.0 mL of methanol (disperser solvent), which was rapidly injected with a syringe into 10mL ofwater sample. Some important parameters affecting the extraction efficiency, such as type and volume of solvents, water sample volume, extraction time,...
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Reducing the number of periodic points in the smooth homotopy class of a self-map of a simply-connected manifold with periodic sequence of Lefschetz numbers
PublicationLet f be a smooth self-map of an m-dimensional (m >3) closed connected and simply-connected manifold such that the sequence of the Lefschetz num- bers of its iterations is periodic. For a fixed natural r we wish to minimize, in the smooth homotopy class, the number of periodic points with periods less than or equal to r. The resulting number is given by a topological invariant J[f] which is defned in combinatorial terms and is...
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Optimization of Polycrystalline CVD Diamond Seeding with the Use of sp³/sp² Raman Band Ratio
PublicationThe influence of various nanodiamond colloids used for seeding nondiamond substrates in microwave plasma enhanced chemical vapour deposition diamond process was investigated. Colloids based on deionized water, isopropanol alcohol and dimethyl sulfoxide (DMSO) were used with different grain size dispersion: 150, 400 and 35 nm, respectively. The influence of growth time was also taken into consideration and bias enhanced nucleation....
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Characterization and classification of hoarfrost samples collected in Poland (2003-2005) by discriminant analysis
PublicationTechnikę analizy dyskryminacyjnej wykorzystano do klasyfikacji próbek szronu (zebranych w latach 2003-2005 na terenie m.in. Gdańska, Grudziądza, Poznania) na naturalnie wyłaniające się grupy oraz by zidentyfikować parametry fizykochemiczne odpowiedzialne za podobieństwa i różnice pomiędzy poszczególnymi miejscami pobierania próbek. Aby ocenić jakość dyskryminacji zastosowano m.in. następujące kryteria: lambdę Wilksa, cząstkową...
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Comparison of Three Extraction Approaches for the Isolation of Neurotransmitters from Rat Brain Samples
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Single Sensor Hot-Wire Anemometer Based on Thermal Time Constant Estimation
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Studies of Transport Properties of Single Layer Devices Based on the Polyazomethine Thin Films
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Photodegradation of single and mixture of parabens – Kinetic, by-products identification and cost-efficiency analysis
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Single-pill combinations, hypertension control and clinical outcomes: potential, pitfalls and solutions
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A single and triple-objective mathematical programming models for assignment of services in a healthcare institution
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Do we need a catalyst in the determination of dissolved organic carbon in environmental samples?
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Performance Evaluation of a Single-Stage Two-Bed Adsorption Chiller With Desalination Function
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Gel-based separation of single-walled carbon nanotubes for metallic and semiconducting fractions
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Long-Term Outcomes of Laparoscopic Sleeve Gastrectomy—a Single-Center, Retrospective Study
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Transporting false doors at the construction site of the Temple of Hatshepsut at Deir el-Bahari
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Makespan minimization of multi-slot just-in-time scheduling on single and parallel machines
PublicationArtykuł podejmuje problem szeregowania zadań przy założeniu podziału czasu na sloty jednakowej długości, gdzie każde z zadań ma ustaloną długość oraz czas jego zakończenia, który jest relatywny do końca slotu. Problem znalezienia uszeregowania polega na dokonaniu przydziału zadań do poszczególnych slotów, przy czym w ogólności długość zadania może wymuszać sytuację, w której zadańie jest realizowane nie tylko w slocie, w którym...
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Studies of human and veterinary drugs' fate in environmental solid samples- analytical problems.
PublicationW różnych ośrodkach naukowych na całym świecie trwają prace nad poznaniem losu środowiskowego zanieczyszczeń z grupy farmaceutyków. Obecność pozostałości farmaceutycznych w poszczególnych elementach środowiska stanowi nowe wyzwanie zarówno z punktu widzenia technologii oczyszczania wód i ścieków jak i analityków, których zadaniem jest opracowanie nowych metodyk analitycznych. W publikacji przedstawiono problemy z jakimi stykają...
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Rime samples characterization and comparison using classical and fuzzy principal components analysis
PublicationEfektywność dwóch nowych algorytmów w stosunku do klasycznego wariantu techniki PCA porównano analizując dane dotyczące zanieczyszczeń próbek sadzi zebranych na terenie trzech stacji w okresie 2004-2007. Zastosowane algorytmy FPCA-1 i FPCA-o pozwalają na wyodrębnienie większej liczby miejsc zbierania próbek i analitów w stosunku do sytuacji, kiedy stosuje się klasyczny wariant techniki PCA.
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Perpetrators from Treblinka: interdisciplinary investigations of seven single graves with “Trawniki Men”
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In-plane and out-of-plane temperature dependencies of the resistivity in single crystals and films of Nd2CuO4
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Superconductivity in PrBa2Cu3O7−δ single crystals after high-temperature thermal treatment
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The effect of adding a standard on the result of determination of polychlorinated biphenyls in bottom sediment samples
PublicationBottom sediments are a very important component of aquatic ecosystems. The sediment matrix is highly diverse and heterogeneous; in consequence, compounds entering the aquatic environment from different sources are considerably enriched at its surface. Bottom sediments are regarded as natural sorbents, since they accumulate many harmful substances, such as heavy metals and stable organic contaminants.Extraction is a key stage in...
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Major ions and their relationship in rime and hoarfrost samples from highly urbanized regions
PublicationW ramach zaplanowanego programu badawczego przeprowadzono analizę próbek szronu i sadzi zebranych w wybranych punktach pomiarowych (Gdańsk i Działdowo) podczas zimy 2003/2004. Stężenie składników nieorganicznych w próbkach szronu jest średnio dwukrotnie wyższe niż w próbkach sadzi zebranych z tego samego terenu. Wyższe poziomy stężeń oznaczanych zanieczyszczeń w próbek szronu mogą wynikać z faktu, iż proces powstawania sadzi najczęściej...
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Antioxidant Activities and Volatile Flavor Components of Selected Single-Origin and Blend Chocolates
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Electronic structure and optical properties of boron doped single-wall carbon nanotubes
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Silver filled single-wall carbon nanotubes—synthesis, structural and electronic properties
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Application of chemometric approach in studies of dew chemistry (on the basis of samples collected in Poland)
PublicationPrzedstawiono wyniki badań wybranych związków chemicznych (aniony, kationy, formaldehyd, nadtlenek wodoru, suma fenoli, TC, TIC, TOC) oznaczonych w próbkach rosy zebranych z różnych obszarów na terenie Polski (Gdynia, Gdańsk, Sopot, Mława, Kraków). Zastosowano analizę funkcji dyskryminacyjnej aby dokonać klasyfikacji poszczególnych próbek w zależności od miejsca pobierania oraz wykryć podstawowe zależności pomiędzy poszczególnymi...
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Modelling of temperature field of flat boiling section with active single nucleation site
PublicationZaprezentowano główne założenia wybranych modeli wrzenia dla pojedynczego centrum nukleacji. Przedstawiony model numeryczny dotyczy zagadnienia dwuwymiarowego, osiowo-symetrycznego, nieizotropowego przewodzenia ciepła dla warunków brzegowych pierwszego, drugiego i trzeciego rodzaju. Warunek brzegowy drugiego rodzaju reprezentuje gęstość strumienia ciepła połączoną z generacją pęcherzy z pojedynczego centrum nukleacji.
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A Single-Center Experience of Renal Transplantation in Elderly Patients: A Paired-Kidney Analysis
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The triple-sorbents solid-phase extraction for pharmaceuticals and estrogens determination in wastewater samples
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Effects of Single and Repeated Footshock on Dopamine Release and Metabolism in the Brains of Fischer Rats
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Microextraction Techniques Used in the Procedures for Determining Organomercury and Organotin Compounds in Environmental Samples
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Determination of PCBs in river sediment samples—proficiency test for selected Polish laboratories
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Association of ENAM gene single nucleotide polymorphisms with dental caries in Polish children
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Organomercury Compounds in Environmental Samples: Emission Sources, Toxicity, Environmental Fate, and Determination
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Simplified Approach for Broadband RF Testing of Low Loss Magneto-Dielectric Samples
PublicationIn this paper, an attractive measurement techniqueis proposed to retrieve the broadband permittivity and permeabil-ity of the magneto-dielectric materials. The proposed techniqueis quite novel which mitigates the major problems associatedwith the conventional broadband RF material characterizationtechniques such as numerical instability and phase uncertaintywhen the length of the sample exceeds...
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Polarimetric studies of L-arginine-doped potassium dihydrogen phosphate single crystals
PublicationConoscopic interference patterns, channelled spectra and polarimetric techniques have been used for the characterization of pure and doped (with L-arginine amino acid) potassium dihydrogen phosphate (KDP) single crystals. Experimental polarimetric data have been obtained for the frequently used wavelength of 633 nm and for two close wavelengths of 532 and 543 nm in a high-accuracy dual-wavelength polarimeter. The measurement of...
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Detail, Facture, and Colour in the Architecture of Polish Single-Family Houses after 1989
PublicationThe article presents single-family houses architecture transformations since 1989, with particularly close attention paid to the significance of detail, facture, and colour. The article presents the architecture as an art of designing and building facilities with both use and aesthetic value, an art of shaping space and building forms. Architectural work should correspond to the intended function, technique, economic and aesthetic...
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Complementary use of GCxGC–TOF–MS and statistics for differentiation of variety in biosolid samples
PublicationFormation of biosolid cakes, which are one of the main wastes generated in wastewater treatment plants, is connected with emission of many hazardous chemical compounds, including odoriferous ones. To optimize particular processes of biosolid cake processing, it is necessary to assess chemical composition of the gas mixtures containing the compounds released from the cakes. The paper proposes application of two-dimensional gas chromatography...
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An analytical hierarchy process for selection of the optimal procedure for resveratrol determination in wine samples
PublicationThe study shows the application of analytical hierarchy process (AHP) in ranking the analytical procedures, that are applied for resveratrol determination in wine samples. 19 different analytical methodologies are described by metrological, economic and environmental criteria, that are further divided into 10 subcriteria. Before AHP application, the amount of input data is decreased with cluster analysis. The first run of AHP is...
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Direct determination of cadaverine in the volatile fraction of aerobically stored chicken breast samples
PublicationTo supplement the currently used methods for poultry meat shelf life assessment, it might be necessary to develop a technique for rapid headspace analysis of volatiles with no prior sample preparation step. Biogenic amines, in particular cadaverine, are considered meat spoilage indicators. Described in this article are the results of a preliminary investigation of the applicability of proton transfer reaction mass spectrometry...
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Interface circuit for impedance sensors using two specialized single-chip microsystems
PublicationW artykule przedstawiono obwód interfejsu przeznaczony do pomiaru parametrów impedancyjnych czujników lub celek pomiarowych instalowanych na obiektach technicznych. Umożliwia on pomiar modułu i argumentu impedancji w zakresie 10ohm
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Derivatization of single-walled carbon nanotubes with redox mediator biocatalytic oxygen electrodes
PublicationSingle-walled carbon nanotubes were covalently modyfied with a redox mediator derived from 2,2'-azino-bis-(3-ethylbenzothiazole)-6-sulfonic acid.
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Determination of metals in water samples by atomic absorption spectrometry and flame emission spectrometry
PublicationMetal species in environmental waters are relevant to characterize the metal toxicity, the mobility between different environmental compartments, and for remediation purposes in case of contamination. The concentration of many trace metals in natural water samples are generally at µg/l level. The paper describes determination of metals in water samples based on flame atomic emission and flame atomic absorption spectrometry.
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Life tests of a rotary single-stage magnetic-fluid seal for shipbuilding applications
PublicationUse of the magnetic fluid seal technology in water is much more difficult technological problem in comparisonto gas or vacuum environment. Some seals constructed up to time been are designed as hybrid, two stagesealing structures with shields or mechanical seals used as protection measures to the magnetic fluid seal.Anyway, there is always problem with immediate contact between magnetic fluid and the environmentalliquid. In the...
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Determination of Selected Organic Acids in Animal Farm Water Samples by Ion Chromatography
PublicationLow molecular mass carboxylic acids (LCAs) occur in many environmental compartments due to natural processes and human activity. They are an important group of organic pollutants of waste water that mainly includes, volatile fatty acids, and also dicarboxylic, aromatic, hydroxy- and ketoacids. LCAs are present in the environment at concentrations between 1 to 5000 ppm and different methods have been reported for their determination...
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Renal regulation of sodium, potassium and chloride balance in single- and twin-pregnant goats
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Determination of chlorine concentration using single temperature modulated semiconductor gas sensor
PublicationA periodic temperature modulation using sinusoidal heater voltage was applied to a commercial SnO2 semiconductor gas sensor. Resulting resistance response of the sensor was analyzed using a feature extraction method based on Fast Fourier Transformation (FFT). The amplitudes of the higher harmonics of the FFT from the dynamic nonlinear responses of measured gas were further utilized as an input for Artificial Neural...
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Determination of cyanide in urine and saliva samples by ion chromatography with pulsed amperometric detection
PublicationCommonly known as a highly toxic chemical, cyanide is also an essential reagent for many industrial processes. It naturally occurs in plant seeds as a cyanogenic glycosides. Another relatively common mode of cyanide exposure is inhalation of environmental tobacco smoke. This study concerns importance to determine cyanide ion in human biological samples. Urine and saliva samples were collected healthy volunteers exposed to tobacco...