2021 - Repozytorium publikacji - Politechnika Gdańska

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Koncepcja Lean Management w uczelniach - przegląd wyników badań międzynarodowych
- Piotr Grudowski
2021
W artykule przedstawiono rozważania dotyczące zastosowań koncepcji Lean Management w instytucjach szkolnictwa wyższego. Zaprezentowano odniesienia do charakterystycznych elementów i zasad tej koncepcji, przedstawione w piśmiennictwie międzynarodowym. Przedstawiono także szereg informacji wiążących się z LeanHE – rozwijającym się dynamicznie nurtem dotyczącym zastosowań Lean Management w szkolnictwie wyższym.
Kriging metamodels and design re‐utilization for fast parameter tuning of antenna structures
- Sławomir Kozieł
- Anna Pietrenko-Dąbrowska
2021 INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS
The paper addresses the problem of computationally efficient electromagnetic (EM)‐driven design closure of antenna structures. The foundations of the presented approach are fast kriging interpolation metamodels, utilized for two purposes: (a) producing a good starting point for further parameter tuning, and (b) yielding a reasonable Jacobian matrix estimate to jump‐start the optimization procedure. The models are rendered using available designs, for example, obtained from the previous design work with the same antenna structure. The low cost of design closure is ensured by employing Broyden‐based trust‐region gradient search along with the aforementioned Jacobian initialization. Our methodology is demonstrated using two planar antennas, a dual‐band uniplanar dipole and a quasi‐Yagi with a parabolic reflector, both optimized within wide ranges of operating conditions (center frequencies, the dielectric permittivity of the antenna substrate). The re‐design process requires only a handful of EM analyses of the respective structure. The presented framework can be viewed as a convenient algorithmic tool that capitalizes on the existing information on the structure at hand to enable warm‐start parameter tuning.
Kształcenie kadr dla gospodarki wodnej na Wydziale Inżynierii Lądowej i Środowiska Politechniki Gdańskiej
- Tomasz Kolerski
2021 Pełny tekst Gospodarka Wodna
Politechnika Gdańska jest częścią europejskiej i światowej wspólnoty akademickiej. Wspólnota Uczelni działa na rzecz podnoszenia dobrostanu społecznego oraz zrównoważenia ekosystemu Ziemi – we współpracy z uczelniami z Europy i świata, a także z podmiotami z innych sektorów. Kształcenie i edukacja realizowane są na 8 wydziałach w ramach 37 kierunków I i II stopnia. Blisko 1300 nauczycieli akademickich kształci przeszło 15 tysięcy studentów z ponad 70 krajów. Uczelnia jest na 2. miejscu w konkursie MNiSW oraz zajmuje 4. miejsce wśród uczelni technicznych w rankingu szkół wyższych miesięcznika Perspektywy. Politechnika Gdańska jest również dostrzegana w rankingach międzynarodowych w tym Academic Ranking of World Universities (Ranking Szanghajski) oraz w prestiżowym zestawieniu najlepszych uczelni na świecie – QS World University Rankings 2021. Politechnika Gdańska oferuje możliwości uzyskania stopnia doktora w dwóch jednostkach: szkole doktorskiej oraz szkole doktorskiej wdrożeniowej, które są bezpłatne, zapewniają stypendium, są interdyscyplinarne i zapewniają kreatywne i interdyscyplinarne podejście do badań. Absolwenci Politechniki Gdańskiej łatwo znajdują pracę i są zadowoleni z wybranej uczelni, a ich wynagrodzenie zalicza się do 1) Dr hab. inż. Tomasz Kolerski, prof. uczelni, Politechnika Gdańska, Wydział Inżynierii Lądowej i Środowiska. najwyższych w kraju. Potwierdzają to nie tylko wyniki corocznego badania losów zawodowych osób, które ukończyły studia na PG, ale i zestawienie przygotowane przez zewnętrzną firmę.
Kwasy nukleinowe - niedoceniane składniki żywności
- Zuzanna Koziara
- Anna Kościelak
- Agnieszka Bartoszek-Pączkowska
2021 Laboratorium
Obecnie badania nad kwasami nukleinowymi koncentrują się na roli genetycznej tych makromolekuł. Można jednak przypuszczać, że DNA jak i RNA powszechnie występujące w żywności mają także ważne znaczenie żywieniowe. Świadczy o tym obecność w układzie pokarmowym szeregu mechanizmów odpowiedzialnych za detekcję, trawienie i przyswajanie tych składników pokarmu. W literaturze naukowej rośnie liczba doniesień sugerujących istotną rolę żywieniową spożywanych kwasów nukleinowych, ale wiedza ta jest daleka od uporządkowania i nie dostarcza jeszcze ugruntowanych poglądów, które mogłyby stanowić podstawę rekomendacji dietetycznych.
La Città Libera di Danzica: compromesso ragionevole o scommessa impossibile?
- Luciano Segreto
2021 Passato e presente. Rivista di storia contemporanea
The article outlines the main economic ptoblems connected with the birth of the Free city of Danzig. In particular, it studies the complex relationships between the city, the Polish government, the League of Nations, and the Allies about the use of the port of Danzig and the increasing competition with the port of Gdynia, built by the Polish government with support of the French one and some french private companies.
Labour resources in Azerbeijan
- Krystyna Gomółka
2021
The article aims to assess the changes of the Azerbaijani labour resources through deductive analysis of historical data and observation of changes in the structure of resources based on generally available macroeconomic data. Analysis shows that, during the period considered, the population of Azerbaijan increased, with a majority living in cities. Universal access to education enabled a growing group of Azerbaijanis to complete secondary education. The percentage of students increased by 35.17%. Following the retirement age increase, the number of economically active and employed people has grown. The unemployment rate, affecting particularly women, has also decreased. The positive migration balance has boosted labour resources since 2008, but the trend was halted by the COVID pandemic in 2020. Business closures have increased unemployment, whereas border closures reduced migration.
Ladder-Based Synthesis and Design of Low-Frequency Buffer-Based CMOS Filters
- Waldemar Jendernalik
- Jacek Jakusz
- Grzegorz Blakiewicz
2021 Pełny tekst Electronics
Buffer-based CMOS filters are maximally simplified circuits containing as few transistors as possible. Their applications, among others, include nano to micro watt biomedical sensors that process physiological signals of frequencies from 0.01 Hz to about 3 kHz. The order of a buffer-based filter is not greater than two. Hence, to obtain higher-order filters, a cascade of second-order filters is constructed. In this paper, a more general method for uffer-based filter synthesis is developed and presented. The method uses RLC ladder prototypes to obtain filters of arbitrary orders. In addition, a set of novel circuit solutions with ultra-low voltage and power are proposed. The introduced circuits were synthesized and simulated using 180-nm CMOS technology of X-FAB. One of the designed circuits is a fourth-order, low-pass filter that features: 100-Hz passband, 0.4-V supply voltage, power consumption of less than 5 nW, and dynamic range above 60 dB. Moreover, the total capacitance of the proposed filter (31 pF) is 25% lower compared to the structure synthesized using a conventional cascade method (40 pF).
Lagrangian model of an isolated dc-dc converter with a 3-phase medium frequency transformer accounting magnetic cross saturation
- Piotr Dworakowski
- Andrzej Wilk
- Michał Michna
- Alexis Fouineau
- Martin Guillet
2021 Pełny tekst IEEE TRANSACTIONS ON POWER DELIVERY
This article presents a nonlinear equivalent circuit model of an isolated dc-dc converter with a 3-phase medium frequency transformer. The model takes into account the magnetic cross saturation of the 3-phase core-type magnetic circuit. The model is suitable in detailed electromagnetic transient simulations of power systems involving isolated dc-dc converters. The model is developed using the Lagrange energy method. It involves a matrix of dynamic inductances containing a nonlinear term resulting from core magnetization and a linear term resulting from leakage flux. The model parameters are determined based on a series of magnetostatic finite element method simulations. This approach is convenient when applied to high power transformers offering a limited characterization effort, or if the transformer prototype does not exist. The experimental validation performed on a novel 3-phase MFT prototype in a 100kW 1.2kV 20kHz dual active bridge converter has proved the validity of the model and model parameters. The no-load steady-state and inrush tests and the full-load test show a very good fit between the simulated and experimentally measured waveforms. The comparison with a classical simplified model neglecting magnetic cross saturation shows a significant difference in the no-load inrush test.
Landscape as a Potential Key Concept in Urban Environmental Planning: The Case of Poland
- Aleksandra Sas-Bojarska
2021 Pełny tekst Urban Planning
Rapid urban development increases the consumption of materials, energy, and water, resulting in an overproduction of waste and emissions. These cause many environmental threats, such as ozone layer depletion and rain acidification, leading to climate change. Therefore, the question arises on how to improve the effectiveness of tools that strengthen environmental protection. This discursive article presents an approach stressing the role of landscape in environmental protection in Poland. It indicates that landscape protection is an ecological, not just an aesthetic activity, as it is often considered in Poland. The landscape reflects all changes occurring in individual elements of the environment resulting from urban development. Through landscape transformations, one can track the growth and accumulation of adverse effects in the chain of environmental changes. Knowledge regarding the dynamics and scope of these transformations can improve ecological design and technologies. Therefore, the landscape condition should be treated as an indicator of sustainable development. If so, one could hypothesise that effective landscape protection contributes to minimising environmental and climate changes. The relationships between the landscape and environmental/climate threats discussed in this article prompt combining some tools related to these threats, which may ensure both effective landscape protection and sustainable development, leading to reduced climate change. The possibilities and benefits of integrating these tools are presented here as well. General considerations are supplemented with references to the situation in Poland to support the need for implementing a more policy-oriented and interdisciplinary approach to landscape protection.
Large Hall and Nernst responses from thermally induced spin chirality in a spin-trimer ferromagnet
- Kamil Kolincio
- Max Hirschberger
- Jan Masell
- Shang Gao
- Akiko Kikkawa
- Yasujiro Taguchi
- Taka-hisa Arima
- Naoto Nagaosa
- Yoshinori Tokura
2021 Pełny tekst PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
The long-range order of noncoplanar magnetic textures with scalar spin chirality (SSC) can couple to conduction electrons to produce an additional (termed geometrical or topological) Hall effect. One such example is the Hall effect in the skyrmion lattice state with quantized SSC. An alternative route to attain a finite SSC is via the spin canting caused by thermal fluctuations in the vicinity of the ferromagnetic ordering transition. Here, we report that for a highly conducting ferromagnet with a two-dimensional array of spin trimers, the thermally generated SSC can give rise to a gigantic geometrical Hall conductivity even larger than the intrinsic anomalous Hall conductivity of the ground state. We also demonstrate that the SSC induced by thermal fluctuations leads to a strong response in the Nernst effect. A comparison of the sign and magnitude of fluctuation–Nernst and Hall responses in fundamental units indicates the need for a momentum–space picture to model these thermally induced signals.
Laser-assisted approach for improved performance of Au-Ti based glucose sensing electrodes
- Adrian Olejnik
- Gerard Śliwiński
- Jakub Karczewski
- Jacek Ryl
- Katarzyna Siuzdak
- Katarzyna Grochowska
2021 APPLIED SURFACE SCIENCE
This paper focuses on the synthesis route and electrochemical properties of electrocatalytic material based on gold nanoparticles (NPs) embedded in a structured titanium template obtained via optimized anodization, chemical etching and laser processing. SEM inspection reveals the presence of Au NPs (60–90 nm in diameter) sited in the titanium foil cavities. Performed electrochemical measurements enable nomination of the set of working laser parameters that allow for fabrication of material possessing the highest performance towards glucose oxidation. It is proven that laser-engineered electrodes have an improved stability in acidic conditions and higher response from glucose oxidation in both alkaline and neutral environment in comparison to analogs obtained by conventional furnace dewetting. In neutral electrolyte it is also observed that the current density increases by almost 300% while the change in mechanism of glucose oxidation was identified due to laser treatment. It is suggested that laser dewetted gold nanoparticles have more surface defects than furnace dewetted ones so that more AuOHads species are created and therefore catalytic activity of the material is enhanced. These results indicate a scalable and cost-effective fabrication route and are important for the current research on nonenzymatic glucose sensors.
Lateral load resistance of piled raft foundation - A case study of District Jail, Saidu Sharif, Swat Pakistan
- Irfan Jamil
- Irshad Khan
- Maaz Amjad
- Mahmood Ahmad
- Umar Farooq
- Tayyaba Bibi
2021 Pełny tekst International Journal of Applied Engineering Research (Netherlands)
Piled raft foundations under lateral loads are usually designed as a pile group, ignoring the contribution of the raft to resisting the lateral loads. In this paper, a case study was performed to determine the raft's contribution to the lateral load resistance. This study analyzed a pile-supported reinforced concrete retaining wall for two different foundation conditions, i.e., pile group foundation and pile raft foundation. Pile group supported reinforced concrete retaining wall was analyzed by following the standard code practice while pile raft supported reinforced concrete retaining wall was analyzed with the help of up-to-the-minute finite element-based software, PLAXIS 3D. It was revealed that by considering the contribution of the raft in the pile raft foundation system subjected to lateral loads, a great deal of economy can be achieved in terms of the small diameter of piles, short pile lengths and less number of piles. The maximum moment on piles was decreased about 2.5-3 times while the maximum shear was decreased about 2-3 times. A decrease in demand also results in reducing the lateral deflection of piles to about 50 %.
Latest Insights on Novel Deep Eutectic Solvents (DES) for Sustainable Extraction of Phenolic Compounds from Natural Sources
- Julio Serna-vázquez
- Mohd Zamidi Ahmad
- Grzegorz Boczkaj
- Roberto Castro-Muñoz
2021 Pełny tekst MOLECULES
Phenolic compounds have long been of great importance in the pharmaceutical, food, and cosmetic industries. Unfortunately, conventional extraction procedures have a high cost and are time consuming, and the solvents used can represent a safety risk for operators, consumers, and the environment. Deep eutectic solvents (DESs) are green alternatives for extraction processes, given their low or non-toxicity, biodegradability, and reusability. This review discusses the latest research (in the last two years) employing DESs for phenolic extraction, solvent components, extraction yields, extraction method characteristics, and reviewing the phenolic sources (natural products, by-products, wastes, etc.). This work also analyzes and discusses the most relevant DES-based studies for phenolic extraction from natural sources, their extraction strategies using DESs, their molecular mechanisms, and potential applications.
LE STIME ECONOMICHE DELLA CIA E L’IMPREVEDIBILE FINE DELL’URSS
- Luciano Segreto
2021 Studi Storici
In this article, we will analyze the debate that took place around the assessments that the CIA gave of the economic situation in the Soviet Union, a clearly decisive key to understanding the overall health of the main political-military opponent of the United States. The article will include the discussions that flared up in the American political establishment starting in 1990, after the fall of the Berlin Wall and the initial disorientation due to the loss of the historical adversary of the Cold War. Moreover, the positions taken by sovietologists in these discussions will be evaluated, as well as the role played in these debates by the analysis developed by Soviet economists in the 1980s. We will lastly consider the official response provided by the CIA (a response that, coming only in 2001, was actually rather slow to arrive), aimed essentially at confirming the correctness of its analyses and reiterating that its duties did not include that of predicting the collapse of the Soviet Union.
Leadership, culture, intellectual capital and knowledge processes for organizational innovativeness across industries: the case of Poland
- Wioleta Kucharska
2021 Pełny tekst Journal of Intellectual Capital
Purpose – This study aims to present the overview of intellectual capital creation micro-mechanisms concerning formal and informal knowledge processes. The organizational culture, transformational leadership and innovativeness are also included in the investigation as ascendants and consequences of the focal relation of intellectual capital and knowledge processes. Design/methodology/approach – Based on a sample of 1,418 Polish knowledge workers from the construction, healthcare, higher education and information technology (IT) industries, the empirical model was developed using the structural equation modeling (SEM) method. Findings – The study exposes that the essence of transformational leadership innovativeness oriented is developing all intellectual capital components. To do so, leaders must support both formal and informal knowledge processes through the organizational culture of knowledge and learning. Furthermore, for best results of the knowledge transformation into intellectual capital, the learning culture must be shaped by both components: learning climate and acceptance of mistakes. Practical implications – Presented findings can be directly applied to organizations to enhance innovativeness. Namely, leaders who observe that the more knowledge is formally managed in their organizations, the less effective the knowledge exchange is-should put more effort into supporting informal knowledge processes to smoothly develop human and relational intellectual capital components. Shortly, leaders must implement an authentic learning culture, including the mistakes acceptance component, to use the full organizational potential to achieve intellectual capital growth. Intellectual capital growth is essential for innovativeness. Originality/value – This study presents the “big picture” of all intellectual capital creation micromechanisms linking transformational leadership with organizational innovativeness and explains the “knowledge paradox” identified by Mabey and Zhao (2017). This explanation assumes that intellectual capital components are created informally (i.e. human and relational ones) and formally (i.e. structural ones). Therefore, for best effects, both formal and informal knowledge processes, must be supported. Furthermore, this study exposes that the intensity of all explored micro-mechanisms is industry-specific
Leveraging spatio-temporal features for joint deblurring and segmentation of instruments in dental video microscopy
- Efkleidis Katsaros
- Anna Jezierska
- Daniel Węsierski
2021
In dentistry, microscopes have become indispensable optical devices for high-quality treatment and micro-invasive surgery, especially in the field of endodontics. Recent machine vision advances enable more advanced, real-time applications including but not limited to dental video deblurring and workflow analysis through relevant metadata obtained by instrument motion trajectories. To this end, the proposed work addresses dental video deblurring and instrument segmentation in a Multi-task Learning fashion, leveraging spatio-temporal adaptive kernels via a recurrent design. The task-specific branches of our architecture employ the responses of those kernels to recover sharper video frames and yield the dental instrument segmentation mask. We demonstrate that the proposed method improves deblurring while retaining segmentation performance under a low computational footprint.
Licencjonowanie oprogramowania
- Tomasz Boiński
- Szymon Olewniczak
2021 Pełny tekst
Wolne i otwarte oprogramowanie przeżywa ostatnimi laty rozkwit. Co raz więcej przedsiębiorstw komercyjnych opiera rozwój swoich firm na otwartym oprogramowaniu. Zarówno mali, jak i duzi gracze mają świadomość komplikacji współczesnych systemów i niemożności samodzielnego ich rozwoju. Z pomocą przychodzi otwarte podejście do wytwarzania oprogramowania. Wymaga to jednak pewnego zrozumienia uwarunkowań prawnych, a w szczególności licencji, na jakich wydawane jest oprogramowanie. Niniejsze opracowanie ma na celu omówienie tychże uwarunkowań, odpowiada na pytanie dlaczego potrzebujemy licencji na oprogramowanie. Opisywane zostały również najważniejsze wg autorów licencje, oraz wskazuje, czym należy kierować się przy doborze licencji.
Lighting Design for the 21st Century Applied research in lighting practice
- Karolina Zielińska-Dąbkowska
2021 Pełny tekst ARC Lighting In Architecture
For those who are unfamiliar with research, it’s important to know there are two categories. Fundamental (or basic) research and applied research. Basic research often discusses scientific ideas/theories, whereas, applied research explores testing these ideas in practice to develop technology or techniques. It’s applied research which most interests lighting practitioners. Great lighting design that creates a pleasant and beneficial user experience in any given space doesn’t just occur miraculously. Rather, it’s built on the designer’s insights and understanding, which comes from sound research and years of practice. This awareness comes from knowing the end users, as well as comprehending what’s best for them. In my view, there are three key research topics for the future of our lighting design profession that we should become familiar with. They are all based on the mounting research about daylight and artificial light and its impact on circadian relevance and biological stimulus. These are: (1) Environmental impact and light pollution, (2) Biophilic office design and (3) User oriented daylight integrated lighting (DIL). These topics have been demonstrated below by some pioneering project examples, where research has been performed to help derive outstanding results.
Light-Modulated Sunscreen Mechanism in the Retina of the Human Eye
- Rafal Luchowski
- Wojciech Grudzinski
- Renata Welc
- Maria Manuela Mendes Pinto
- Alicja Sek
- Jan Ostrowski
- Łukasz Nierzwicki
- Paweł Chodnicki
- Miłosz Wieczór
- Karol Sowinski
- Robert Rejdak
- Anselm G. M. Juenemann
- Grzegorz Teresinski
- Jacek Czub
- Wieslaw Gruszecki
2021 Pełny tekst JOURNAL OF PHYSICAL CHEMISTRY B
The functioning of the human eye in the extreme range of light intensity requires a combination of the high sensitivity of photoreceptors with their photostability. Here, we identify a regulatory mechanism based on dynamic modulation of light absorption by xanthophylls in the retina, realized by reorientation of pigment molecules induced by trans–cis photoisomerization. We explore this photochemically switchable system using chromatographic analysis coupled with microimaging based on fluorescence lifetime and Raman scattering, showing it at work in both isolated human retina and model lipid membranes. The molecular mechanism underlying xanthophyll reorientation is explained in terms of hydrophobic mismatch using molecular dynamics simulations. Overall, we show that xanthophylls in the human retina act as “molecular blinds”, opening and closing on a submillisecond timescale to dynamically control the intensity of light reaching the photoreceptors, thus enabling vision at a very low light intensity and protecting the retina from photodegradation when suddenly exposed to strong light.
Linkages between services and manufacturing as a new channel for GVC development: Evidence from CEE countries
- Aleksandra Kordalska
- Magdalena Olczyk
2021 Pełny tekst Structural Change and Economic Dynamics
The goal of the paper is to verify a causal relationship between forward linkages from domestic services to manufacturing and the participation/position of a country in global value chains (GVCs) in selected Central and Eastern European economies. We observed a strong polarisation pattern: the Baltic countries along with the Czech Republic strengthen their positions and participation in GVCs by having a strong relationship between the financial sector and manufacturing, while Poland, Hungary, and Slovakia have solid linkages between transportation services and manufacturing. We also discover that the reverse relationship is significant.