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Search results for: CALIBRATION OF SPME
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Synthesis, spectroscopy and computational studies of some novelphosphorylated derivatives of quinoline-5,8-diones
PublicationThe neutral phosphorus nucleophiles such as R2P(=Y)M allowed the radical addition to 2-methyl-5,8-dioxo-5,8-dihydroquinoline-7-amine and N-(2-methyl-5,8-dioxo-5,8-dihydroquinolin-7-yl)acetamide giving exclusively O-phosphorylated products. All products were quantitatively prepared and characterized by microanalysis, and multinuclear NMR spectroscopy. Seven of them, have been characterized by single crystal X-ray diffraction method....
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On the inappropriate fit of diffusion functions at thermal decomposition of some azomonoethers in liquid state
PublicationW celu analizy rozkładu termicznego tytułowych barwników azowych zastosowano mechanizmy D1, D2, D3 i D4. W wyniku przeprowadzonych badań stwierdzono, że rozkład zachodzi w fazie ciekłej, zaś w celu wyznaczenia parametrów aktywacji oraz wyznaczenia funkcji przemiany zastosowano koncepcje homo- i heterogeniczne.
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Activity evaluation of some psychoactive drugs with the application of QSAR/QSPR modeling methods
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Studies of the complex formation between some proton sponges and Cu(II) cations
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Some fundamental aspects of self-levitating sliding contact bearings and their practical implementations
PublicationIn this study, fundamental aspects and mechanisms of acoustic levitation together with governing equations are presented first. Then, the acoustic levitation phenomenon is considered as a new way to design air suspension systems capable of self-levitation. A particular emphasis is laid on journal bearings and their specific geometrical configuration. A practical feasibility of using acoustic levitation to separate contacting surfaces...
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Synthesis, spectroscopy and computational studies of some biologically important hydroxyhaloquinolines and their novel derivatives
PublicationA series crystalline compounds of methyl and phosphinyl derivatives of 2-methylquinolin-8-ol (1a) and related 5,7-dichloro-2-methylquinolin-8-ol (1b) were quantitatively prepared and characterized by microanalysis, IR, UV-vis and multinuclear NMR spectroscopy. Five of them have been characterized by single crystal X-ray diffraction method. The known compounds, 8-methoxy-2-methylquinoline (2a) and 8-methoxyquinoline (2d), were synthesised...
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Isolation and some properties of collagen from the backbone of Baltic cod(Gadus morhua)
PublicationOssein from Baltic cod backbone was obtained after extraction of non-collagenous protein with 0.1 M NaOH solution and demineralization with 1.0 M HCl solution. The extractions were performed at 4 C for24, 48 and 72 h using a solid/solution ratio from 1:4 to 1:8 (w/v). After 48 h of extraction in 0.5 M acetic acid only about 25% of collagen was dissolved. After 48 h of extraction at optimal concentration of pepsin(4 mg/g ossein)...
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Maritime transportation risk analysis: Review and analysis in light of some foundational issues
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Links between Faith and Some Strengths of Character: Religious Commitment Manifestations as a Moderators
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Some of Challenges Faced by Eco-Neighbourhoods in Poland in Comparison with EcoQuartier Program in France
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Spectral and photophysical properties of some imidazo[1,2-a]purine derivatives related to acyclovir
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Effect of Laser Treatment on Intrinsic Mechanical Stresses in Titanium and Some of Its Alloys
PublicationLaser surface treatment conducted at different power levels is an option to modify titanium bone implants to produce nano- and microtopography. However, such processing can lead to excess mechanical stress within the surface layer. This research aims to calculate the level of such residual stresses after the surface processing of Ti grade IV, Ti15Mo, and Ti6Al7Nb alloys with an Nd:YAG laser. Light and scanning electron microscopies...
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Study on some of the strength properties of soft clay stabilized with plastic waste strips
PublicationIt is well known that if plastic wastes are not well managed, it has a negative impact on the environment as well as on human health. In this study, recycling plastic waste in form of strips for stabilizing weak subgrade soil is proposed. For this purpose, a weak clay soil sample was mixed with 0.2%, 0.3%, and 0.4% of plastic strips by weight of soil, and the experimental results were compared to the control soil sample with 0%...
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Development of thin film SPME sorbents based on deep eutectic solvents and their application for isolation and preconcentration of endocrine-disrupting compounds leaching from diapers to urine
PublicationIn this study, the thin film solid phase microextraction (TF-SPME) based on a novel sorbent composed of deep eutectic solvent (DES) is proposed. Among several synthesized sorbents the most efficient was DES containing trihexyl(tetradecyl)phosphonium chloride and docosanol mixed with polydimethylsiloxane (PDMS) in a molar ratio 1:3:0.25 to achieve a more stable structure. The proposed sorbent was applied on a fiberglass mesh and...
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Fuzzy decision support system for the control of budget and schedule in SPM
PublicationObiektem rozważań jest komputerowy system wspierania decyzji kierowniczych w zakresie zarządzania budżetem i harmonogramem przy realizacji projektów informatycznych. Omawiany system opary jest na dynamicznych modelach rozmytych podlegających bieżącemu dostrajaniu na podstawie danych z obserwacji zarządzanego procesu. Wstępny projekt modeli rozmytych oparty został na danych zarządczych pochodzących z realizacji dwu projektów informatycznych....
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The Influence of Microstructure on the Passive Layer Chemistry and Corrosion Resistance for Some Titanium-Based Alloys
PublicationThe effect of microstructure and chemistry on the kinetics of passive layer growth and passivity breakdown of some Ti-based alloys, namely Ti-6Al-4V, Ti-6Al-7Nb and TC21 alloys, was studied. The rate of pitting corrosion was evaluated using cyclic polarization measurements. Chronoamperometry was applied to assess the passive layer growth kinetics and breakdown. Microstructure influence on the uniform corrosion rate of these alloys...
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On some problems in determining tensile parameters of concrete model from size effect tests
PublicationThe paper presents results of numerical simulations of size effect phenomenon in concrete specimens. The behaviour of in-plane geometrically similar notched and unnotched beams under three-point bending is investigated. In total 18 beams are analysed. Concrete beams of four different sizes and five different notch to depth ratios are simulated. Two methods are applied to describe cracks. First, an elasto-plastic constitutive law...
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Identification of Bodner-Partom Viscoplastic Model Parameters for Some Aluminum Alloys at Elevated Temperature
PublicationThe paper presents the identification process of inelastic (viscoplastic) properties for two aluminum alloys at a temperature of 120°C. The material parameters are calculated on the basis of uniaxial tension tests. Twelve tests at elevated temperature for each alloy have been performed—three tests for four different strain rates. The main purpose of the paper is to identify the Bodner-Partom viscoplastic model parameters for two...
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Some Common Medicinal Plants with Antidiabetic Activity, Known and Available in Europe (A Mini-Review)
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Detection of some volatile degradation products released during photoexposition of ranitidine in a solid state
PublicationRanitidine (RAN) is on top of the list of prescribed drugs, due to its popularity as a selective H2-receptor antagonist, which efficiently decreases the amount of acid produced in the stomach. RAN is not stable both in a solid state and in a solution, which creates manufacturing problems, requires appropriate storage conditions, and results in a short drug shelf-life. The aim of this work was to study the emission of volatile...
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Comparative control of the bioactivity of some frequently consumed vegetables subjected to different processing conditions
PublicationCelem prowadzonych badań było określenie wpływu warunków obróbki przed spożyciem na własciwości przeciwutleniające białej i czerwonej cebuli oraz czosnku poddanym obróbce poprzez gotowanie i blanszowanie. Do określenia poziomu aktywności przeciwutleniającej wykorzystano testy ABTS, DPPH, FRAP i CUPRAC.
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Effect of lysozyme or nisin on survival of some bacteria treated with high pressure at subzero temperature
PublicationCelem pracy było określenie wrażliwości gramujemnych i gramdodatnich bakterii na działanie ciśnienia 193MPa w temp. -20°C w obecności lizozymu lub nizyny. Stwierdzono, że połączone działanie ciśnienia i badanych substancji przeciwdrobnoustrojowych na zawiesiny bakterii Escherichia coli i Staphylococcus aureus powodowało większy stopień inaktywacji komórek niż suma efektów wywieranych przez pojedyncze czynniki.
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Protection and conservation of modern movement heritage in Gdynia - some examples of local Government activities
Publicationartykuł dotyczy ochrony i konserwacji acrhitektury modernizmu na przykładzie miasta Gdyni
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Fenomen homonimii międzyjęzykowej – rozważania językoznawcy [The phenomenon of interlingual homonymy – some reflections of a linguist]
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Some problems of self-excited vibrations of turbine rotors. Part I: The theoretical method
PublicationPrzedstawiono teoretyczną metodę określania uszczelnienia nadbandażowego lub dławicy zupełnej, które odgrywa największą rolę w generowaniu samowzbudnych drgań typu aerodynamicznego wirników turbinowych. Drgania harmoniczne układu wirnika turbiny opisane są macierzowym równaniem, a wymuszenia aerodynamiczne określane metodą współczynników wpływu.
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Isolation and some properties of the thermostable beta-galactosidase of Pyrococcus woesei expressed in Escherichia coli
PublicationOpracowano metodę izolowania oraz zbadano właściwości enzymu otrzymanego ze szczepu Escherichia coli zawierającego gen kodujący termostabilną beta-ga-laktozydazę z Pyrococcus woesei.
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Some adjustment and exploitation problems of the controllable pitch propeller pneumatic and hydraulic control systems
PublicationW artykule przedstawiono opis awarii układu regulacji pneumatyczno -hydraulicznego okrętowej śruby nastawnej, której skutkiem było uderzenie specjalistycznego statku pożarniczego w pirs paliwowy w Porcie Północnym w Gdańsku. Podjęte przez autora czynności, w tym analizy i komisyjnie przeprowadzony eksperyment, pozwoliły wyjaśnić przyczyny tego zdarzenia oraz ukazać pewne problemy na jakie powinni zwrócić uwagę projektanci i użytkownicy...
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Acoustic field and the entropy mode induced by it in a waveguide filled with some non-equilibrium gases
PublicationThe non-linear propagation of an acoustic beam in a rectangular waveguide is considered. The medium of sound propagation, is a gas where thermodynamically non-equilibrium processes take place: such as exothermic chemical reactions or excitation of vibrational degrees of a molecule’s freedom. The incident and reflected compounds of the acoustic field do not interact in the leading order in the case of periodic weakly nonlinear sound...
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Multi-residue method for the determination of 16 recently used pesticides from various chemical groups in aqueous samples by using DI - SPME coupled with GC-MS
PublicationA simple and solvent-free multi-residue method has been optimized to determine 16 currently used pesticides from different chemical groups in aqueous samples. The extraction of analytes was carried out with direct immersion solid-phase microextraction (DI-SPME) and for the identification and quantitative determination gas chromatography coupled with mass spectrometry (GC-MS) was applied. Two commonly used adsorbent coatings have...
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Innovation and Knowledge Management in the SME Sector and the Role of Normative Management Systems
PublicationThe article presents deliberations related to importance and specificity of innovation activities in small and medium-sized enterprises. Basing on results of the research the characteristics of the SMEs concerning process related and organizational innovation has been determined. Interrelations between innovation activities and knowledge management within the framework of normative management systems have been emphasized.
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Instruments for the support of the SME innovation-oriented activities (French and Polish experiences)
PublicationArtykuł jest próbą porównania instrumentów wsparcia innowacyjności małych i średnich przedsiębiorstw w Polsce i we Francji. Szczegółowo przedstawiono w nim zaproponowane w obu krajach systemy wsparcia, w podziale na instrumenty państwowe i regionalne.
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A general method for the derivation of the functional forms of the effective energy terms in coarse-grained energy functions of polymers. III. Determination of scale-consistent backbone-local and correlation potentials in the UNRES force field and force-field calibration and validation
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Elucidation of the effect of some cholinium amino acid ionic liquids on the thermal and the conformational stability of insulin
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Hunting for the Magnesium(I) Species: Formation, Structure, andReactivity of some Donor-Free Grignard Compounds
PublicationMagnesium bromide radicals have to be prepared as high-temperature molecules and trapped as a metastable solution because a seemingly simple reduction of donor-free Grignard compounds failed. However, the essential role of magnesium(I) species during the formation of Grignard compounds could be demonstrated experimentally.
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Antioxidative properties of some vegetable products traditional for diets in Central European diet - short report
PublicationBadania nad przeciwutleniającymi właściwościami wybranych warzywnych produktów spożywczych prowadzone były przy użyciu testu ABTS i testu kometkowego. Wykazano, że spośród badanych produktów najwyższą aktywność przeciwutleniającą wykazywał koncentrat buraczany oraz kiszona kapusta. Sok z kiszonej kapusty w badaniach przy użyciu komórek białaczki i testu kometkowego miał zdolność ochrony komórek przed aktywnymi formami tlenu.
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Some methods of diagnosis of analog circuit using mixed signal test bus IEEE 1149.4
PublicationW artykule przedstawiono wybrane metody testowania i diagnostyki analogowych układów elektronicznych zamontowanych na pakiecie pomiędzy układami scalonymi wyposażonymi w magistralę IEEE 1149.4. Prezentowane metody dobrano pod kątem stopnia skomplikowania układów testowanych oraz specyficznych właściwości metrologicznych magistrali, które ograniczają możliwości pomiarowe i aplikacyjność metod. Rozważono trzy typy układów testowanych:...
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Lipophilicity data for some preservatives estimated by reversed-phase liquid chromatography and different copmutation methods
PublicationW pracy przedstawiono wyniki badań właściwości chromatograficznych wybranych 12 związków z grupy kopnserwantów. Lipofilowy charakter tych związków był oceniany na podtsawie różnych parametrów retencyjnych (log Kw, log K i inne. Zastosowano narzędzie chemometryczne do zbadania korelacji występujących pomiędzy tymi parametrami retencji chromatogfraficznej.
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The Death Penalty, the “Marriage Penalty” and Some Remarks on the Utility of Senecan Research in the Study of Roman Law
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Effect of some organic solvent - water mixtures composion on precipitated calcium carbonate in carbonation process
PublicationPrecipitated calcium carbonate particles were obtained during carbonation of calcium hydroxide slurry with carbon dioxide. Aqueous solutions of isopropyl alcohol, n-butanol and glycerol were used as solvents. Concentration of organic additives in the reactive mixture was from 0 to 20 % (vol.). Precipitation process were performed in a stirred tank reactor equipped with gas distributor. Multimodal courses of particles size distribution...
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Determination of environmental pollutants in soil and sediments - some aspects of sample clean-up and GC analysis
PublicationPrzedstawiono wstępne wyniki badań nowej procedury analitycznej przeznaczonej do badań próbek i osadów dennych na zawartość związków organicznych (WWAPCB). Procedura składa się z następujących etapów: - ekstrakcji analitów z wykorzystaniem techniki ASE, - oczyszczania ekstraktów (kolumienki), - chromatograficznego rozdzielania i oznaczania analitów.
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Some remarks on the pore water pressure dissipation patterns from the one-dimensional consolidation test
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FTIR and NMR studies of bis(oxaalkyl) sulphates(IV) and their complexes with proton and some metal cations
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Proton transfer reactions from some diarylcyanomethanes to cis 1,2-bis(diethylaminomethyl)cyclohexane in acetonitrile
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Modelling of some stealth features for a small navy ship at the concept design stage - part II
PublicationIn the paper a few problems associated with modelling the basic stealth features for a small ship at the concept design stage are introduced. One problem concerns the modification of the immersed ship hull using the rapid change of the ship loading condition. The second is associated with the modification of the ship boundary layer by the hull skin cover. The other stealth features of the ship are not presented in this paper. The...
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The study of salting-out thin-layer chromatography and their application on QSRR/QSAR of some macrolide antibiotics
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Edge subdivision and edge multisubdivision versus some domination related parameters in generalized corona graphs
PublicationGiven a graph G= (V, E), the subdivision of an edge e=uv∈E(G) means the substitution of the edge e by a vertex x and the new edges ux and xv. The domination subdivision number of a graph G is the minimum number of edges of G which must be subdivided (where each edge can be subdivided at most once) in order to increase the domination number. Also, the domination multisubdivision number of G is the minimum number of subdivisions...
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Chemical, Aroma and Pro-Health Characteristics of Kaffir Lime Juice—The Approach Using Optimized HS-SPME-GC-TOFMS, MP-OES, 3D-FL and Physiochemical Analysis
PublicationThe study aimed to provide the chemical, aroma and prohealth characteristics of the kaffir lime juice. A procedure using solid-phase microextraction with gas chromatography (SPME-GC-TOFMS) was optimized and validated for the determination of terpenes of kaffir lime. Main physicochemical parameters: pH, vitamin C, citric acid and °Brix were evaluated. Micro- and macro elements were determined using microwave plasma optic emission...
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Radioisotope measurement of selected parameters of liquid-gas flow using single detector system
PublicationTo determine the parameters of two-phase flows using radioisotopes, usually two detectors are used. Knowing the distance between them, the velocity of the dispersed phase is calculated based on time delay estimation. Such a measurement system requires the use of two gamma-ray sealed sources. But in some situations it is also possible to determine velocity of dispersed phase using only one scintillation probe and one gamma-ray source....
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Application and optimization of headspace solid-phase microextraction (HS-SPME) coupled with gas chromatography - flame-ionization detector (GC-FID) to determine products of the petroleum industry in aqueous samples
PublicationA simple and solvent-free analytical method has been optimized for the determination of hydrocarbons (C6 - C20) from products of the petroleum industry in aqueous samples. Extraction and analysis was carried out using headspace solid-phase microextraction (HS-SPME) and gas chromatography coupled with flame-ionization detector (GC-FID). A ZB-5 capillary column (30 m × 0.25 mm inner diameter, 0.25 µm film thickness) was used for...
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In Vitro Studies on the Relationship Between the Antioxidant Activities of Some Berry Extracts and Their Binding Properties to Serum Albumin
PublicationThe aim of this study was to investigate the possibility to use the bioactive components from cape gooseberry (Physalis peruviana), blueberry (Vaccinium corymbosum), and cranberry (Vaccinium macrocarpon) extracts as a novel source against oxidation in food supplementation. The quantitative analysis of bioactive compounds (polyphenols, flavonoids, flavanols, carotenoids, and chlorophyll) was based on radical scavenging spectrophometric assays...