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Wyniki wyszukiwania dla: LC−MS LIPIDOMICS
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Photoactivity of decahedral TiO2 loaded with bimetallic nanoparticles: Degradation pathway of phenol-1- 13 C and hydroxyl radical formation
PublikacjaDecahedral TiO2decorated with bimetallic nanoparticles were synthesized via radiolysis and photode-position method. The effect of bimetallic surface composition (Ag Pt, Ag Au, Au Pd, Au Pt) as well asdeposition technique (simultaneous or sequential) on the photocatalytic activity in phenol degradationand efficiency of hydroxyl radicals generation under UV–vis light irradiation were investigated. Modifiedand pristine decahedral...
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Impact of selected parameters of the fermentation process of wine and wine itself on the biogenic amines content: Evaluation by application of chemometric tools
PublikacjaThe demand for safer foods has promoted more research into biogenic amines (BAs) over the past few years, however, there are still some questions that remain unanswered. Despite the fact that BAs are present in wine and can cause toxic effect to the body, a shared regulation limiting the amounts of BAs in wine is still lacking. A detailed understanding of their presence in wine is also important for the food trade sector. Therefore,...
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Detection of Bioactive Compounds in Organically and Conventionally Grown Asparagus Spears
PublikacjaIn the recent reports, there are contradictory conclusions about the nutritional and health properties of organic and conventionally growing vegetables. We hypothesized that organic cultivation system results in higher quality of asparagus (Asparagus officinalis L.) because of organic manure and effective organisms. Therefore, new analytical methods were applied in order to find the differences in bioactive compounds between the...
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Validated HPTLC method for determination of ledol and alloaromadendrene in the essential oil fractions of Rhododendron tomentosum plants and in vitro cultures and bioautography for their activity screening
PublikacjaRhododendron tomentosum (Ledum palustre) is a bog shrub used in traditional medicine for treatment of respiratory and rheumatic diseases. Due to the large variability of the chemical composition of its essential oil, depending on the habitat, the in vitro cultures were established as the alternative source of the volatile fraction. There is a need to monitor a quality of the field grown as well as in vitro plant material, especially...
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Online Volatile Compound Emissions Analysis Using a Microchamber/Thermal Extractor Coupled to Proton Transfer Reaction-Mass Spectrometry
PublikacjaIndoor air is a complex and dynamic mixture comprising manifold volatile organic compounds (VOCs) that may cause physiological and/or psychological discomfort, depending on the nature of exposure. This technical note presents a novel approach to analyze VOC emissions by coupling a microchamber/thermal extractor (μ-CTE) system to a proton transfer reaction-mass spectrometer (PTR-MS). This configuration provides an alternative to...
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Hydroxyl and sulfate radical-based degradation of ciprofloxacin using UV-C and/or Fe2+-catalyzed peroxymonosulfate: Effects of process parameters and toxicity evaluation
PublikacjaCiprofloxacin (CIP) is a valuable antibiotic and discharged in huge quantities in aquatic environment. Different •OH and SO4•−-based advanced oxidation technologies (AOTs), e.g., Fe2+/PMS, UV-C/PMS, and UV-C/Fe2+/PMS are developed for treatment of CIP. The removal of CIP by Fe2+/PMS, UV-C/PMS and UV-C/Fe2+/PMS was 63, 77, and 87 %, respectively, under identical conditions which showed better performance of UV-C/Fe2+/PMS. The UV-C/Fe2+/PMS...
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Influence of CeO2 and TiO2 Particles on Physicochemical Properties of Composite Nickel Coatings Electrodeposited at Ambient Temperature
PublikacjaThe Ni-TiO2 and Ni-CeO2 composite coatings with varying hydrophilic/hydrophobic characteristics were fabricated by the electrodeposition method from a tartrate electrolyte at ambient temperature. To meet the requirements of tight regulation by the European Chemicals Agency classifying H3BO3 as a substance of very high concern, Rochelle salt was utilized as a buffer solution instead. The novelty of this study was to implement a...
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Structure and Stability Characterization of Natural Lake Pigments Made from Plant Extracts and Their Potential Application in Polymer Composites for Packaging Materials
PublikacjaNatural dyes were extracted from various plant sources and converted into lake pigments based on aluminum and tin. Three different plants (weld, Persian berries, and Brazilwood) were chosen as representative sources of natural dyes. High-performance liquid chromatography (HPLC) and triple-quadrupole mass spectrometry (QqQ MS) were used to identify dyestuffs in the raw extracts. The natural dyes and lake pigments were further characterized...
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Insight into Potassium Vanadates as Visible-Light-Driven Photocatalysts: Synthesis of V(IV)-Rich Nano/Microstructures for the Photodegradation of Methylene Blue
PublikacjaPhotocatalysis is regarded as a promising tool for wastewater remediation. In recent years, many studies have focused on investigating novel photocatalysts driven by visible light. In this study, K2V6O16·nH2O nanobelts and KV3O8 microplatelets were synthesized and investigated as photocatalysts. Samples were obtained via the facile method based on liquid-phase exfoliation with ion exchange. By changing the synthesis temperature...
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Multi-Analytical Techniques for the Study of Burial Clothes of Polish King Sigismund III Vasa (1566–1633) and His Wife Constance Habsburg (1588–1631)
PublikacjaThe subjects of this research are the burial clothes of Polish King Sigismund III Vasa and his wife Constance, which were woven and embroidered with silk and metal threads. Fragments of the textiles underwent spectroscopic, spectrometric, and thermogravimetric analyses. The hydrofluoric acid extraction method was improved to isolate various classes of dyes from the textile samples that had direct contact with human remains. High-performance...
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Sonocatalytic degradation of Bisphenol A from aquatic matrices over Pd/CeO2 nanoparticles: Kinetics study, transformation products, and toxicity
PublikacjaIn this work, different ratios of palladium – cerium oxide (Pd/CeO2) catalyst were synthesized and characterized, while their sonocatalytic activity was evaluated for the degradation of the xenobiotic Bisphenol A (BPA) from aqueous solutions. Sonocatalytic activity expressed as BPA decomposition exhibited a volcano-type behavior in relation to the Pd loading, and the 0.25Pd/CeO2 catalyst characterized by the maximum Pd dispersion...
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Assessment of Sewage Molecular Markers: Linear Alkylbenzenes in Sediments of an Industrialized Region in Peninsular Malaysia
PublikacjaIn this study, the use of linear alkylbenzenes (LABs) was employed to pinpoint the sources of human activity that cause detrimental impacts on the coastal environment and river ecosystems. LABs were detected using GC–MS in sediment samples assembled from Kim Kim River (KKR) and the Port Dickson coast (PDC). To assess the significance of variations in the distribution and concentrations of LABs across the sampling sites, this study...
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Visible light photocatalysis employing TiO2/SrTiO3-BiOI composites: Surface properties and photoexcitation mechanism
PublikacjaA series of binary TiO2/SrTiO3 and ternary TiO2/SrTiO3_BiOI composites have been synthesized using multistep preparation method. Characterization of the obtained photocatalysts covered complex analysis including morphology + y (SEM), BET specific surface area, porosity, optical properties (DRS), chemical composition of surface (XPS), crystal structure and crystal size (XRD). UV–vis and Vis ligh induced photocatalytic activity was...
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Urban dew formation efficiency and chemistry in Poland
PublikacjaThe measurements of dew formation efficiency and chemistry were performed in Poland in September 2009, as a part of a longer, two-year sampling campaign. Pairs of sites, representing centers of major Polish cities and rural conditions in three different regions, were compared. With the aim to get more detailed landuse-oriented characteristics of dew, two additional sites were set close to Wroclaw. Collection of dew at each site...
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Bioreactor shoot cultures of Rhododendron tomentosum (Ledum palustre) for a large-scale production of bioactive volatile compounds
PublikacjaRhododendron tomentosum Harmaja (Ledum palustre), a peat bog plant from Ericaceae family, has been used in traditional medicine as the anti-arthritis agent. Although modern researches confirm its anti-inflammatory properties, it remains threatened by habitat degradation and possibilities to collect this endangered species from its natural environment for further biological activity studies are limited. Therefore, R. tomentosum...
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Zdolni z Pomorza 2017/18 - Java i Android - podstawy programowania
Kursy OnlineCel kursu: Celem kursu jest zapoznanie uczniów z podstawami w zakresie programowania w języku Java oraz z podstawami tworzenia aplikacji w środowisku Android. Opis kursu: Materiał przedstawiany na kursie będzie wprowadzał do zagadnień programowania w języku Java oraz środowiska Android. Od uczniów wymagana jest podstawowa wiedza w zakresie obsługi komputerów. Mile widziane są wcześniejsze doświadczenia w zakresie programowania...
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Zdolni z Pomorza 2018/19 - Java i Android - podstawy programowania
Kursy OnlineCel kursu: Celem kursu jest zapoznanie uczniów z podstawami w zakresie programowania w języku Java oraz z podstawami tworzenia aplikacji w środowisku Android. Opis kursu: Materiał przedstawiany na kursie będzie wprowadzał do zagadnień programowania w języku Java oraz środowiska Android. Od uczniów wymagana jest podstawowa wiedza w zakresie obsługi komputerów. Mile widziane są wcześniejsze doświadczenia w zakresie programowania...
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ZzP - Podstawy budowania stron przy pomocy PHP7 - Spotkanie Akademickie 21.11.2020 r.
Kursy OnlineSpotkanie poświęcone będzie zapoznaniu uczniów z podstawami w zakresie programowania w języku PHP7 przy tworzeniu dynamicznie generowanych treści stron internetowych. Przedstawiany materiał będzie wprowadzał do zagadnień programowania w języku PHP. Od uczniów wymagana jest podstawowa wiedza w zakresie obsługi komputerów, oraz tworzenia prostych stron internetowych za pomocą technologii HTML, CSS i JavaScript. Mile widziane są...
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The Action Mechanisms, Anti-Cancer and Antibiotic-Modulation Potential of Vaccinium myrtillus L. Extract
PublikacjaHerbal medicinal products containing Vaccinium myrtillus L. (bilberry) fruits and fruit extracts are widely available in the market. Although bilberry leaves and stems are considered as bio-waste, they contain much higher levels of phenolic compounds than fruits. The study aimed to investigate the antimicrobial and anticancer potential of aerial part extracts from Vaccinium myrtillus L. (V. myrtillus, VM) plants harvested at high...
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Szkolenie CNE: O żarcie i zabawie na zajęciach ze studentami
Wydarzenia„Dydaktyczne Piątki” w Centrum Nowoczesnej Edukacji: „O wizytach Herkulesa, podręcznikach na wesoło i escape roomach, czyli o żarcie i zabawie na zajęciach ze studentami”
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Szkolenie CNE: Grywalizacja przedmiotów na PG
Wydarzenia„Dydaktyczne Piątki” w Centrum Nowoczesnej Edukacji: „Grywalizacja przedmiotów na Politechnice Gdańskiej: doświadczenia wykładowców z WFTiMS, WZiE, WILiŚ”
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Cascade Object Detection and Remote Sensing Object Detection Method Based on Trainable Activation Function
PublikacjaObject detection is an important process in surveillance system to locate objects and it is considered as major application in computer vision. The Convolution Neural Network (CNN) based models have been developed by many researchers for object detection to achieve higher performance. However, existing models have some limitations such as overfitting problem and lower efficiency in small object detection. Object detection in remote...
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Application of analytical methods for the determination of bioactive compounds in some berries
PublikacjaFluorometry, ESI-MS, FTIR, and radical scavenging assays were used for characterization of bioactive compounds and the levels of their antioxidant activities. Polyphenols, flavonoids, anthocyanins, and ascorbic acid and the level of antioxidant activity of water extracts of “Murtilla-like” [Myrteola nummularia (Poiret) Berg.], and other widely consumed berries were determined and compared. The contents of bioactive compounds and...
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‘Green’ multi - residue methods for the determination of high importance currently used pesticides in environmental samples
PublikacjaThe purpose of the research has been to develop and apply ‘green’ analytical methodologies to control and monitor the level of currently used pesticides from different chemical groups in aqueous samples. For extraction of analytes solid - phase microextraction (SPME) and dispersive liquid - liquid microextraction (DLLME) have been applied and compared. For SPME, commonly used materials for coating fibers include: polydimethylsiloxane...
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Formation of chlorinated breakdown products during degradation of sunscreen agent, 2-ethylhexyl-4-methoxycinnamate in the presence of sodium hypochlorite
PublikacjaIn this study, a new degradation path of sunscreen active ingredient, 2-ethylhexyl-4-methoxycinnamate (EHMC) and 4-methoxycinnamic acid (MCA) in the presence of sodium hypochlorite (NaOCl), was discussed. The reaction products were detected using gas chromatography–mass spectrometry (GC-MS). Since HOCl treatment leads to more polar products than EHMC, application of polar extracting agents, dichloromethane and ethyl acetate/n-hexane...
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Phenolic Content and Related Antioxidant Activities in in vitro Cultures of Cephalotaxus Harringtonia L. Grown in Egypt
PublikacjaAbstract: Quantitative estimation of the total phenolics, total flavonoids, antioxidant activity and HPLC analysis of phenolic compounds in the mother plant, in vitro shooting and callus cultures of Cephalotaxus harringtonia L. grown in Egypt were measured. For shooting behaviour, using Woody plant medium (WPM) with 2 mg/l Benzyladinin (BA) in the second subculture gave the highest number of shootlet/explant (2.33 shootlet/explant)...
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The Metal-Free Regioselective Deuteration of 2-Methylquinolin-8-ol and 2,5-Dimethylquinolin-8-ol, Spectroscopic and Computational Studies
PublikacjaAbstract: Aim and Background: Introducing deuterium to a molecule is of interest to a wide variety of research, including investigation of reaction mechanisms or kinetics, analysis of drug metabolism, structural elucidation of molecules, and syntheses of isotopically labeled materials used for NMR spectroscopy and medicinal research. Objective: The transition-metal-free regioselective deuteration of 2-methylquinolin-8-ol...
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Investigation on air quality of specific indoor environments—spa salons located in Gdynia, Poland
PublikacjaDue to excessive application of essential oils and scented products in spa salons during aromatherapy and massage sessions, the elevated concentration of total volatile organic compounds (TVOCs), particularly terpenes, which are known as secondary organic aerosol (SOA) precursors, is expected there. This study was aimed at determination of VOCs with a particular regard to terpenes in air samples collected in selected spa salons...
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Characteristics of volatile organic compounds emission profiles from hot road bitumens
PublikacjaA procedure for the investigation and comparison of volatile organic compounds (VOCs) emission profiles to the atmosphere from road bitumens with various degrees of oxidation is proposed. The procedure makes use of headspace analysis and gas chromatography with universal as well as selective detection, including gas chromatography–mass spectrometry (GC–MS). The studies revealed that so-called vacuum residue, which is the main component...
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Relationship between the betalain composition in Opuntia ficus indica and Beta vulgaris varieties and biological activity of their extracts
PublikacjaBetalains are a class of pigments that are much less com- monly found in nature than anthocyanins or carotenoids. They occur only in a few edible plants such as red beetroot (Beta vulgaris), prickly pears (Opuntia ficus indica), amaranth (Amaranthus sp.) and some mushrooms. This group of pig- ments can be divided into two major groups: yellow vulgax- anthins and red betanins. Despite their structural similarity to compounds from...
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Anthropogenic trace metals in Setiu Wetland: Spatial and seasonal distribution and implications for environmental health
PublikacjaThe growing urban wastewater volume poses a major global environmental challenge, especially in developing nations where inadequate treatment and discharge impact clean water availability. This study focused on Setiu Wetland, aiming to analyze seasonal and spatial variations of trace metals in particulate form from anthropogenic and pathogenic sources. Surface water samples were collected from multiple stations, measuring physical...
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Ultrasound-assisted solvent extraction of porous membrane packed solid samples: A new approach for extraction of target analytes from solid samples
PublikacjaFor the first time, a porous membrane-based method is proposed for the extraction of target analytes directly from the solid samples. This method involves the packing of solid sample inside a porous polypropylene membrane sheet whose edges are heat-sealed to fabricate a bag. This bag is immersed in a suitable solvent and the analytes are extracted by the application of ultrasound energy. The various factors that affect the extraction...
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5-Selenocyanato and 5-trifluoromethanesulfonyl derivatives of 2′-deoxyuridine: synthesis, radiation and computational chemistry as well as cytotoxicity
Publikacja5-Selenocyanato-2′-deoxyuridine (SeCNdU) and 5-trifluoromethanesulfonyl-2′-deoxyuridine (OTfdU) have been synthesized and their structures have been confirmed with NMR and MS methods. Both compounds undergo dissociative electron attachment (DEA) when irradiated with X-rays in an aqueous solution containing a hydroxyl radical scavenger. The DEA yield of SeCNdU significantly exceeds that of 5-bromo-2′-deoxyuridine (BrdU), remaining...
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Influence of steam cooking on pro-health properties of Small and Large variety of Momordica charantia
PublikacjaSteam cooking is one of the most common preparations of Momordicacharantia dishes. This method improved the tastiness of the fruits but at the same time, some changes occurred in the volatile and non-volatile parts of their food matrices. In this study, for the first time these properties were correlated with the found substances affecting the bioactivity of this fruit. Two varieties of Momordicacharantia were analysed and compared....
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The Influence of Laser Alloying of Ti13Nb13Zr on Surface Topography and Properties
PublikacjaThe laser alloying is a continually developing surface treatment because of its significant and specific structuration of a surface. In particular, it is applied for Ti alloys, being now the most essential biomaterials` group for load-bearing implants. The present research was performed on the Ti13Nb13Zr alloy subject to laser modification in order to determine the treatment effects on surface topography and its some mechanical...
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Programowanie aplikacji internetowych
Kursy OnlineKurs "Programowanie aplikacji internetowych" dotyczy projektowania aplikacji internetowych w oparciu o model projektowania ASP.NET MVC (ang. Active Server Pages – Model-View-Controller) z wykorzystaniem języków C# (Back-end), HLML, CSS, Razor (Front-end). Zakres kursu obejmuje: Struktura aplikacji w parciu o model programowania MVC, Kontrolery i metody obsługi zdarzeń – atrybuty ActionVerbs i ActionSelctrors, Projektowanie...
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CTD Gdańsk Deep_2001_2005
Dane BadawczeDataset includes measurements of conductivity (mS cm-1), temperature (°C), sound speed (m s-1) and salinity (PSU) made with the probe Falmouth Scientific Inc. The research was carried out in 2001 (at the turn of May and June), 2003 (beginning of May), 2005 (end of April) and in 2002 and 2004 (at the turn of September and October). In 2002, only temperature...
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Spotkanie informacyjne – Startup School One
WydarzeniaGdańsk Tech Startup School zaprasza na spotkanie informacyjne online w związku z naborem do programu Startup School One pn. „Sprawdź swój pomysł”.
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Spotkanie informacyjne – Startup School One
WydarzeniaGdańsk Tech Startup School zaprasza na spotkanie informacyjne online w związku z naborem do programu Startup School One pn. „Sprawdź swój pomysł”.
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Wpływ wybranych stanów przejściowych w układzie zasilania na sieciowe pojazdy trakcyjne.
PublikacjaWprowadzane są do eksploatacji nowoczesne pojazdy z przekształtnikami energoelektronicznymi, które pracują równolegle z dotychczas eksploatowanymi pojazdami klasycznymi. Rozprawa naświetla pewien aspekt związany z eksploatacją nowoczesnych pojazdów trakcyjnych i ich współpracą z układem zasilania, mówiący o możliwości wystąpienia oscylacji napięć i prądów, wywołanych zmianą parametrów LC systemu trakcyjnego, wynikającą z obecności...
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Technika sygnałów analogowych. - Tom 1,2
Publikacjaom I składa się z sześciu rozdziałów. W rozdziale 1 scharakteryzowano sygnały, elementy, układy i systemy analogowe. Poznanie właściwości elementów ma kluczowe znaczenie przy przewidywaniu właściwości zbudowanych z nich układów elektronicznych. Podobnie znajomość podstawowych praw rządzących rozkładami prądów i napięć ma zasadnicze znaczenie dla zrozumienia metod analizy układów elektronicznych. Rozdział 2 jest poświęcony liniowym...
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Technika dyspersyjnej mikroekstrakcji w układzie ciecz-ciecz z zestaleniem cieczy jonowej
WynalazkiChromatografia gazowa jest najczęściej stosowaną metodą do szybkiej analizy złożonych mieszanin związków chemicznych oraz oceny czystości tych związków, zarówno w przemyśle jak i w rozmaitych laboratoriach. Technika GC umożliwia ustalenie procentowego składu mieszanin związków chemicznych, w których występuje ich nawet kilkaset. Ekstrakcję analitów z roztworów wodnych przeprowadza...
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„Lean w nauce i praktyce”
WydarzeniaCLIP-HUB to forum wymiany myśli i doświadczeń dotyczących obszarów związanych z produkcją, innowacjami, logistyką i współpracą (szczególnie międzyorganizacyjną).
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Zdolni z Pomorza 2018/19 - HTML5 - podstawy programowania
Kursy OnlineCel kursu: Celem kursu jest zapoznanie uczniów z podstawami w zakresie programowania w języku HTML5 oraz z podstawami tworzenia aplikacji w środowisku JavaScript. Opis kursu: Materiał przedstawiany na kursie będzie wprowadzał do zagadnień programowania w języku HTML5 oraz CSS3 i Java Script. Od uczniów wymagana jest podstawowa wiedza w zakresie obsługi komputerów. Mile widziane są wcześniejsze doświadczenia w zakresie programowania...
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Zdolni z Pomorza 2017/18 - HTML5 - podstawy programowania
Kursy OnlineCel kursu: Celem kursu jest zapoznanie uczniów z podstawami w zakresie programowania w języku HTML5 oraz z podstawami tworzenia aplikacji w środowisku JavaScript. Opis kursu: Materiał przedstawiany na kursie będzie wprowadzał do zagadnień programowania w języku HTML5 oraz CSS3 i Java Script. Od uczniów wymagana jest podstawowa wiedza w zakresie obsługi komputerów. Mile widziane są wcześniejsze doświadczenia w zakresie programowania...
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Marlena Gruba mgr inż.
Osoby -
Uptake, accumulation, and translocation of Zn, Cu, Pb, Cd, Ni, and Cr by P. australis seedlings in an urban dredged sediment mesocosm: impact of seedling origin and initial trace metal content
PublikacjaThe study presents results from 6 months of phytoremediation of sediments dredged from three urban retention tanks carried out in a mesocosm setup with the use of P. australis. Two kinds of P. australis seedlings were considered: seedlings originating from natural (uncontaminated - Suncont) and anthropogenically changed environments (contaminated – Scont); this distinction was reflected in the baseline concentrations of trace metals...
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Dynamic host configuration protocol for IPv6 improvements for mobile nodes
PublikacjaIn wireless networks mobile clients change their physical location, which results in changing point of attachment to the network. Such handovers introduce unwanted periods, when node does not have communication capabilities. Depending on many conditions, such events may require reconfiguration of layer 2 (e.g. IEEE 802.16) or both 2 and 3 layers (IPv6). This paper investigates delays introduced in the latter type of handover. IPv6...
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Procedura przygotowania próbki do oznaczania wielopierścieniowych węglowodorów aromatycznych w produktach technicznych
PublikacjaW pracy opisano nową metodę przygotowania próbki w celu oznaczania śladowych zawartości wielopierścieniowych węglowodorów aromatycznych (WWA) w wysokowrzących produktach naftowych. Wartości granicy oznaczalności dla badanych WWA w materiałach tego typu mieściły się w przedziale od kilkudziesięciu ng/kg do poniżej dwudziestu ug/kg. Badania wykazały, że w celu oddzielenia większości zanieczyszczeń od analitów, bez ich znaczących...
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Oznaczania pozostałości pestycydów w powietrzu na terenie aglomeracji trójmiejskiej i terenach wiejskich
PublikacjaCelem opisanych badań było uzyskanie informacji o poziomie zanieczyszczeń powietrza atmosferycznego przez anality z grupy pestycydów na terenie Aglomeracji Trójmiejskiej, Tczewa oraz terenach wiejskich z wykorzystaniem dozymetrów pasywnych z krążkami z pianki poliuretanowej na etapie pobierania próbek analitów. Praca realizowana była we współpracy z Fundacją ARMAAG (Agencja Regionalnego Monitoringu Atmosfery Aglomeracji Gdańskiej)....