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Tworzenie testów z matematyki z wykorzystaniem platformy eNauczanie
- Magdalena Łapińska
- Anna Niewulis
2019 Pełny tekst Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Celem artykułu jest zaprezentowanie wykorzystania platformy eNauczanie do tworzenia testów sprawdzających wiedzę z matematyki po pierwszym semestrze nauki matematyki na Politechnice Gdańskiej. Omówione zostaną różne typy pytań ze szczególnym zwróceniem uwagi na pytania, które pozwolą przedstawić treści z matematyki w efektywny sposób.
Tynki w budownictwie ogólnym. wybrane badania oraz problemy eksploatacyjne
- Maciej Niedostatkiewicz
- Tomasz Majewski
- Marcin Burdziński
2019
Monografia stanowi studium przypadku problemów związanych z realizacją oraz eksploatacją tynków stosowanych w obiektach budownictwa ogólnego
Tynki-pojęcia podstawowe i podział
- Maciej Niedostatkiewicz
- Tomasz Majewski
2019 Pełny tekst Inżynier Budownictwa
W artykule przedstawiono opis podstawowych pojęć i zaproponowano podział tynków. Opisano w szczegółach podstawowe uwarunkowania decydujące o trwałości tynków
Tytuły kościoła pocysterskiego w Oliwie
- Aleksander Piwek
2019 UNIVERSITAS GEDANENSIS
Kościół pocysterski w Oliwie obecnie ma trzy tytuły: Trójcy Świętej, Najświętszej Panny Marii i św. Bernarda. Z dokonanych badań wynika, że zestaw ten nie jest pierwotny lecz powstał z biegiem czasu. Na najstarszego patrona, jeszcze małej kaplicy z pocz. XIII wieku, wybrano NPMarię. Kolejny, św. Bernard został dodany po zakończeniu prac w 3 ćw. XIII wieku. Powstał wtedy pierwszy w pełni ukończony oliwski kościół. Ostatniego patrona - Trójcę Świętą - wybrano,jak należy przypuszczać, przed 1342 rokiem (Jej święto ustanowiono 1334), a w kościele nastąpiły znaczące zmiany:prezbiterium wydłużono i założono obejście powiększając tym samym część wschodnią kościoła o połowę dotychczasowej powierzchni. Pewność dość wczesnego powstania tego ostatniego wezwania dostarcza dopiero zapis w kronice zakonnej dokonany w 1594 roku. Analiza trzech tytułów kościoła oliwskiego pozwala przyjąć ich jako dodatkowe źródło do chronologii przemian architektonicznych.
Ubodzy, chorzy, sieroty. Szpitale dawnego Gdańska w okresie średniowiecza i nowożytności
- Adam Szarszewski
- Aleksander Piwek
- Piotr Samól
- Janusz Dargacz
- Katarzyna Darecka
2019
W książce starano się zarysować historię rozwoju i architekturę gdańskich instytucji dobroczynnych od XIV do XVIII w., a także wskazać problemy do rozwiązania w toku przyszłych badań. Zebrano spory, niepublikowany dotychczas materiał badawczy, oparty na wieloletnich studiach prowadzonych przez autorów. Książka składa się z 6 rozdziałów - dwa pierwsze dotyczą ogólnie historii i architektury szpitalnej w okresie średniowiecza i nowożytności, kolejne stanowią natomiast monograficzne opracowanie dwóch najlepiej zachowanych zespołów instytucji dobroczynnych - szpitala Bożego Ciała i Domu Dobroczynności i Sierot. Jednocześnie należy podkreślić, że poza zainteresowaniem autorów – z uwagi na konieczność precyzyjnego zakreślenia prowadzonych studiów – znalazła się chociażby kwestia ludzi chorych i wykluczonych, którzy korzystali ze wsparcia zakonów żebraczych, i wspólnot żyjących przy nich (prebendarzy, beginek czy tzw. bractw pokutnic przy kaplicy św. Marii Magdaleny).
Ukraine’s Energy Security in Strategies
- Krystyna Gomółka
2019 Pełny tekst Annales Universitatis Mariae-Curie Skłodowska, sectio K – Politologia
During the independence period, the Ukrainian government has published two energy security strategies. The first strategy was adopted in 2006 and the second one in 2016. Both documents provided a similar definition of energy security. The aims of the first strategy, covering the period 2006–2030, were the restructuring of the fuel and energy complex using new technologies, increase of energy efficiency and ensuring market prices of energy generation and sale. The second strategy was much more extensive and envisaged the implementation of changes in three stages until 2035. The changes proposed in the document are reasonable from the point of view of Ukraine’s energy security. The strategy does not take an explicit position on decarbonisation, although it provides for the modernisation of power plants and closure of unprofitable mines. Some of the goals of the Ukrainian energy sector were only roughly outlined and therefore need elaboration and clear indication of how they would be achieved. The aim of this article is to analyse the reforms and measures provided for in Ukraine’s strategies designed to ensure the country’s energy security. The research hypothesis is as follows: The reforms envisaged in the strategies can effectively contribute to ensuring the state’s energy security. To test this hypothesis, the author formulated the following research questions: 1. How did the two energy strategies define security?; 2. Which elements of energy policy were considered to be the most important in the first strategy document?; 3. What energy security components are listed in the second strategy document?; 4. Were the measures specified in the first and second strategies capable of ensuring the energy security of Ukraine? The applied research methods were the following: literature research, comparison method and content analysis.
Ultrasonic Tomography of Brick Columns Based on FEM Calculations
- Monika Zielińska
- Magdalena Rucka
2019 Pełny tekst IOP Conference Series: Materials Science and Engineering
Ultrasonic tomography is one of the most developed method of non-destructive testing. Despite being used mainly in medicine, it is becoming more and more popular as a method for monitoring of structural elements. It allows to examine the internal structure and technical condition of the tested element. This paper investigates the influence of crosssectional geometry on an obtained tomographic image. Wave propagation signals were obtained using finite element method (FEM). The analysis was conducted on six models of solid brick columns with a square section. The first one constituting a reference model was made in the form of a full column. The other models contained internal inclusions affecting propagating waves such as: a hole or a steel plate, circular bar and square pipe adhesively bonded with mortar. The obtained results of the analysis presented in the study allowed to assess the ultrasonic tomography usability for masonry structures.
Ultrasound and Clinical Preoperative Characteristics for Discrimination Between Ovarian Metastatic Colorectal Cancer and Primary Ovarian Cancer: A Case-Control Study
- Maciej Stukan
- Juan Luis Alcazar
- Jacek Gębicki
- Elizabeth Epstein
- Marcin Liro
- Alexandra Sufliarska
- Sebastian Szubert
- Stefano Guerriero
- Elena Braicu
- Mariusz Szajewski
- Malgorzata Pietrzak-stukan
- Daniela Fischerova
2019 Pełny tekst Diagnostics
The aim of this study was to describe the clinical and sonographic features of ovarian metastases originating from colorectal cancer (mCRC), and to discriminate mCRC from primary ovarian cancer (OC). We conducted a multi-institutional, retrospective study of consecutive patients with ovarian mCRC who had undergone ultrasound examination using the International Ovarian Tumor Analysis (IOTA) terminology, with the addition of evaluating signs of necrosis and abdominal staging. A control group included patients with primary OC. Clinical and ultrasound data, subjective assessment (SA), and an assessment of different neoplasias in the adnexa (ADNEX) model were evaluated. Fisher's exact and Student's t-tests, the area under the receiver-operating characteristic curve (AUC), and classification and regression trees (CART) were used to conduct statistical analyses. In total, 162 patients (81 with OC and 81 with ovarian mCRC) were included. None of the patients with OC had undergone chemotherapy for CRC in the past, compared with 40% of patients with ovarian mCRC (p < 0.001). The ovarian mCRC tumors were significantly larger, a necrosis sign was more frequently present, and tumors had an irregular wall or were fixed less frequently; ascites, omental cake, and carcinomatosis were less common in mCRC than in primary OC. In a subgroup of patients with ovarian mCRC who had not undergone treatment for CRC in anamnesis, tumors were larger, and had fewer papillations and more locules compared with primary OC. The highest AUC for the discrimination of ovarian mCRC from primary OC was for CART (0.768), followed by SA (0.735) and ADNEX calculated with CA-125 (0.680). Ovarian mCRC and primary OC can be distinguished based on patient anamnesis, ultrasound pattern recognition, a proposed decision tree model, and an ADNEX model with CA-125 levels.
Ultrasound-Assisted Solvent Extraction of a Porous Membrane Packed Sample for the Determination of Tobacco-Specific Nitrosamines in the Replacement Liquids for E-Cigarettes
- Paweł Kubica
2019 Pełny tekst MOLECULES
The 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 mass spectrometry with electrospray ionisation (HPLC-ESI-MS/MS) in the multiple reaction monitoring mode. The sample preparation of replacement liquids was accomplished via the ultrasound-assisted solvent extraction of a porous membrane packed sample. The sample preparation proved to be successful in extracting the analytes, with recoveries from 87% to 105%, with coefficients of variation < 4.9%. Moreover, the linearity and limits of detection and quantitation (LOD, LOQ), together with repeatability and accuracy, were determined for the developed method. The proposed sample preparation and developed chromatographic method were successfully applied to the determination of TSNAs in 9 replacement liquid samples. The NNK and NNN were found to be most frequently detected (89 and 67%, respectively), with concentration ranges from 1.2–54.3 ng/mL and 4.1–30.2 ng/mL, respectively, while NAT was detected with frequency of 22% with range 1.7–2.5 ng/mL and NAB were found to be below the LOD in all samples.
Ultrasound-assisted solvent extraction of porous membrane packed solid samples: A new approach for extraction of target analytes from solid samples
- Muhammad Sajid
- Mateusz Kacper Woźniak
- Justyna Płotka-Wasylka
2019 Pełny tekst MICROCHEMICAL JOURNAL
For 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 performance such as extraction solvent, ultrasonication time, and ultrasound power are suitably optimized. The scope of this extraction method is very general, it can be used for the extraction of different classes of analytes from a variety of solid samples using suitable extraction solvents. The beauty of this method lies in the fact that only the small molecules such as analytes can pass through the membrane while the interfering or complex matrix species cannot pass through the membrane bag to the extraction solvent. Previously, the solid samples were first digested/dissolved into liquid medium and then analytes were extracted by membrane-protected adsorbents involving adsorption and desorption steps. With the proposed procedure, the steps of digestion/dissolution and the adsorption of analytes onto a suitable adsorbent are eliminated. Likewise, the steps of filtration and centrifugation are not required as the solid is effectively packed inside the membrane bag. Moreover, the extraction device is low cost, portable, easy to fabricate, and simple to use in the extraction process. In this work, proof of the concept is demonstrated by the extraction of polyaromatic hydrocarbons from the soil samples using GC–MS. This method provided reasonably low LODs ranging from 0.19 to 0.93 ng/mg. The intra-day accuracy and precision ranged from 87.5 to 109% and 0.8 to 5%, respectively while recoveries varied from 75.1 ± 4.9 to 106 ± 4.5%.
Ultrazimne atomy od kuchni
- Mateusz Zawadzki
2019 Fizyka w Szkole
Artykuł prezentuje w jaki sposób osiągnąć temperaturę bliską 0 K w laboratorium fizycznym. Krok po kroku opisane zostały procedury eksperymentalne używane do wytwarzania atomowego kondensatu Bose-Einsteina, m.in. chłodzenie laserowe, pułapkowanie magnetyczne, chłodzenie przez odparowanie.
Umiędzynarodowienie usług Biblioteki Politechniki Gdańskiej
- Urszula Szybowska
2019 Pełny tekst Biuletyn EBIB
Jednym z kluczowych celów realizowanych przez Bibliotekę Politechniki Gdańskiej jest wspomaganie procesu internacjonalizacji prowadzonego na Politechnice Gdańskiej, także w kontekście ob-sługi studentów zagranicznych. W tekście omówiono historyczny kontekst mobilności edukacyjnej w Europie, przedstawiono dane statystyczne dotyczące studentów zagranicznych w świecie i w Polsce oraz ukazano, jak na tle przedstawionych danych wygląda umiędzynarodowienie Politechniki Gdańskiej i Biblioteki PG. Ponadto przedstawiono repertuar zainicjowanych działań, których celem jest rozwijanie umiędzynarodowie-nia biblioteki akademickiej, koordynowanych przez Zespół ds. Międzynarodowej Współpracy Akademickiej w Bibliotece Politechniki Gdańskiej.
Uncertainty assessment of ultimate strength of corroded stiffened plates subjected to different maintenance actions
- Krzysztof Wołoszyk
- Yordan Garbatov
2019
The study deals with the uncertainty assessment of different governing factors related to the ultimate strength of the corroded stiffened plates. The load-carrying capacity is predicted with the use of the nonlinear Finite Element Method. The most influencing governing factors in the non-linear FE analysis, such as material properties and initial imperfections are modeled and analysed as stochastic variables. The ultimate strength is evaluated accounting for different maintenance actions, related to cleaning process of corroded plates including: intact corroded one, corroded sandpaper cleaned and corroded sandblasted cleaned. Results showed a significant scatter in the strength predictions and several conclusions are derived based on the uncertainty model developed here.
Uncertainty in emotion recognition
- Agnieszka Landowska
2019 Journal of Information, Communication and Ethics in Society
Purpose–The purpose of this paper is to explore uncertainty inherent in emotion recognition technologiesand the consequences resulting from that phenomenon.Design/methodology/approach–The paper is a general overview of the concept; however, it is basedon a meta-analysis of multiple experimental and observational studies performed over the past couple of years.Findings–The mainfinding of the paper might be summarized as follows: there is uncertainty inherent inemotion recognition technologies, and the phenomenon is not expressed enough, not addressed enough andunknown by the users of the technology.Practical implications–Practical implications of the study are formulated as postulates for thedevelopers, users and researchers dealing with the technologies of automatic emotion recognition.Social implications–As technologies that recognize emotions are becoming more and more common,and perhaps more decisions influencing people lives are to come in the next decades, the trustworthiness ofthe technology is important from a scientific, practical and ethical point of view.Originality/value–Studying uncertainty of emotion recognition technologies is a novel approach and isnot explored from such a broad perspective before.
Unconditionally blue: Curing epoxy with polyethylene glycol (PEG) surface-functionalized Zn Fe3-O4 magnetic nanoparticles
- Maryam Jouyandeh
- Samir M. Hamad
- Isa Karimzadeh
- Mustafa Aghazadeh
- Zohre Karami
- Vahideh Akbari
- Farnaz Shammiry
- Krzysztof Formela
- Mohammad Saeb
- Zahra Ranjbar
- Mohammad Ganjali
2019 PROGRESS IN ORGANIC COATINGS
Nanoparticles govern early (chemical-controlled) and late (diffusion-controlled) stages of epoxy crosslinking, respectively. Surface functionalization of nanoparticles with macromolecules was recognized as an effective route to compensate for inadequate diffusion-controlled crosslinking. However, the effect of bulk composition amended with cations having catalytic effect towards epoxy ring opening has remained hitherto undescribed. In this work, cathodic electrochemical method was applied to obtain naked iron oxide nanoparticles (IONPs), polyethylene glycol (PEG) capped IONPs (PEG-IONPs) and zinc-doped IONPs (Zn-doped PEG-IONPs) for evaluation of the effects of surface (alone) and surface-bulk (concurrent) modification of IONPs. Various techniques including FTIR, XRD, VSM, and FE-SEM were employed to probe into changes in the surface and bulk of nanoparticles. Cure Index calculated based on nonisothermal differential scanning calorimetry (DSC) allowed for labeling epoxy nanocomposites as Poor (Red) or Good (Blue) cured networks. Partial substitution of Fe2+ cations by Zn2+ in the bulk of Zn-doped PEG-IONPs with respect to PEG-IONPs labeled their corresponding epoxy nanocomposites in Blue and Red. Although at low and high heating rates epoxy/PEG-IONPs was labeled Red, epoxy/Zn-doped PEG-IONPs nanocomposites was unconditionally labeled Blue thanks to a more significant catalytic effect springing from Zn2+ cations in Zn-doped IONPs compared to hydroxyl groups alone in PEG-IONPs.
Understanding the origin of high corrosion inhibition efficiency of bee products towards aluminium alloys in alkaline environments
- Jacek Ryl
- Joanna Wysocka
- Mateusz Cieślik
- Husnu Gerengi
- Tadeusz Ossowski
- Stefan Krakowiak
- Paweł Niedziałkowski
2019 Pełny tekst ELECTROCHIMICA ACTA
Various bee products were found to be efficient corrosion inhibitors of aluminium in different environments. In particular, bee pollen was found to be highly effective in alkaline electrolytes, yet its highly complex composition and possible synergistic interactions hinder determination of the compounds acting as active corrosion inhibitors. The main purpose of the following work is to investigate the effect of solvents used for pollen extraction process on the corrosion inhibition of AA5754 alloy in alkaline environment. Both infrared and mass spectroscopies as well as chromatographic analysis were used to determine differences in the composition of each obtained extract. The inhibition efficiency (IE%) of each extract was determined by using the potentiodynamic polarization and impedance studies. The highest IE%, exceeding 90% at 10 gL-1, was recorded for the water/ethanol extract. Most importantly, it has been found that the dichloromethane extract containing less polar compounds enhanced the corrosion rate at low bee pollen concentrations, and offered lower inhibition efficiency at the concentrations above 10 gL-1. The adsorption isotherms were drawn based on dynamic impedance spectroscopy in galvanostatic mode (g-DEIS), while the measurements carried out at elevated temperatures allowed the construction of Arrhenius plots and, consequently, the confirmation of the physical mechanism of adsorption.
Uniqueness or uniformity - studies of media architecture
- Karolina Życzkowska
2019 Pełny tekst IOP Conference Series: Materials Science and Engineering
A development of media architecture is presented in light of to such phenomena as aesthetization, consumerism and digitization. This article deals with media architecture in commercial spaces. Media solutions impact on the architectural skin, making it into visible and dynamic points of the image of a post-modern city. This article presents the specificity of media solutions, depending on the function of commercial activity buildings (museums and other cultural objects, sports facilities and multi-functional halls, shopping malls, hotels and offices). The analysis was based on a set of 60 representative examples of media architecture objects. Staring with our own definition of a media solution (understood as a synergy of form, transmission and display element), the article presents the main relations between the range of solutions, the content of transmission (from commercial to non-commercial content) and technologies (from media mesh to architectural media details). The analysis allows us to point out main similarities of components of media solutions among functional groups, so the scope of uniformity of media architectural objects in the whole group of representative examples. The article stresses that the form, the discretion of media solutions (connected to artistic content, nonfigurative transmission and slow speed of changing images) and architectural media details are the most important factors influencing the uniqueness of media architecture. The relation between the discretion of media solution and the occurrence of media detail is also examined.
Universal autonomous control and management system for multipurpose unmanned surface vessel
- Andrzej Stateczny
- Paweł Burdziakowski
2019 Pełny tekst Polish Maritime Research
The paper presents design, structure and architecture of the Universal Autonomous Control and Management System (UACAMS) for multipurpose unmanned surface vessel. The system was designed, installed and implemented on the multipurpose platform - unmanned surface vessel named HydroDron. The platform is designed to execute hydrographic survey missions with multi-variant configuration of the survey system (payload? ) including multi-beam echo sounder, sonar, LiDAR, automotive radar, photographic and spectral camera systems. The UACAMS designed to provide flexibility that enables to operate on the different kind of surface platform and different type of functional payload. The full system configuration provides all four level of autonomy starting from remotely controlled to full autonomous mission. Each level can be implemented and run depending on user specific requirements. The paper explains the differences between autonomous and automatic mission and shows how the autonomy is implemented into the presented system. The full hardware structural design as well as the software architecture are described. In order to confirm initial assumptions the applied system was tested during four- week sea trials and tuned for a selected vessel to confirm assumptions. In the project, also the original shore control station was designed, produced and tested for the vessel, including specific user controls and radio communication system. Conclusions sum up all crucial points of the design and system implementation process.
Unsupervised machine-learning classification of electrophysiologically active electrodes during human cognitive task performance
- Krishnakant Saboo
- Yogatheesan Varatharajah
- Brent M. Berry
- Vaclav Kremen
- Michael R. Sperling
- Kathryn A. Davis
- Barbara C. Jobst
- Robert E. Gross
- Bradley C. Lega
- Sameer A. Sheth
- Gregory A. Worrell
- Ravishankar K Iyer
- Michał Tomasz Kucewicz
2019 Pełny tekst Scientific Reports
Identification of active electrodes that record task-relevant neurophysiological activity is needed for clinical and industrial applications as well as for investigating brain functions. We developed an unsupervised, fully automated approach to classify active electrodes showing event-related intracranial EEG (iEEG) responses from 115 patients performing a free recall verbal memory task. Our approach employed new interpretable metrics that quantify spectral characteristics of the normalized iEEG signal based on power-in-band and synchrony measures. Unsupervised clustering of the metrics identified distinct sets of active electrodes across different subjects. In the total population of 11,869 electrodes, our method achieved 97% sensitivity and 92.9% specificity with the most efficient metric. We validated our results with anatomical localization revealing significantly greater distribution of active electrodes in brain regions that support verbal memory processing. We propose our machine-learning framework for objective and efficient classification and interpretation of electrophysiological signals of brain activities supporting memory and cognition.
Uproszczone modelowanie linii kablowych wysokiego napięcia a napięcia indukowane w żyłach powrotnych – studium przypadku
- Krzysztof Dobrzyński
- Stanisław Czapp
- Jacek Klucznik
- Zbigniew Lubośny
2019 Pełny tekst Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Linie kablowe, obok linii napowietrznych, są jednym z podstawowych elementów składowych systemów elektroenergetycznych. Stosowane są głównie na terenach zurbanizowanych, gdzie prowadzenie linii napowietrznych jest mocno utrudnione lub wręcz niemożliwe. Linie kablowe wysokiego napięcia budowane są głównie z wykorzystaniem kabli, które oprócz żyły roboczej mają również współosiową żyłę powrotną. Istnieje kilka układów pracy takich linii, które różnią się sposobem uziemienia żył powrotnych i ewentualnym zastosowaniem przeplatania żył powrotnych i/lub żył roboczych. Budowa linii kablowej wysokiego napięcia każdorazowo powinna zostać poprzedzona analizą modelową, która pozwoli określić poziomy napięć i prądów indukowanych w żyłach powrotnych. Jak wynika z analiz, zbyt duże uproszczenia w modelowaniu mogą prowadzić do błędnego wnioskowania