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Poly(hydroxybutyrate-co-hydroxyvalerate) as a biodegradable binder in a negative electrode material for lithium-ion batteries
- Andrzej Nowak
- Konrad Trzciński
- Zuzanna Zarach
- Jinjin Li
- Daria Roda
- Mariusz Szkoda
2022 Pełny tekst APPLIED SURFACE SCIENCE
In this work, graphite-based negative electrode for lithium-ion battery consisting a novel and biodegradable binder poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) is compared with standard graphite electrode with polyvinylidene fluoride (PVDF) as a binder. The rate and cycling performance of lithium ion insertion/extraction of electrodes with PHBV in a half-cell configuration are evaluated. Moreover, on the basis of the electrochemical tests it is concluded that the electrode with PHBV binder is characterized by similar specific capacity and diffusion coefficient of lithium ions as conventional graphite electrode with PVDF binder.
Poly-L-Lysine-functionalized fluorescent diamond particles: pH triggered fluorescence enhancement via surface charge modulation
- Monika Janik
- Maciej Głowacki
- Mirosław Sawczak
- Anna Wcisło
- Paweł Niedziałkowski
- Kacper Jurak
- Mateusz Ficek
- Robert Bogdanowicz
2022 Pełny tekst MRS BULLETIN
Recently, the interest in applying fluorescent diamond particles (FDPs) containing nitrogen-vacancy (NV) centers for enhancing the mechanical and chemical properties of some materials, biological imaging, and sensing has been expanding rapidly. The unique properties of NV centers such as intensive, time-stable fluorescence, and an electron spin, which exhibits long coherence time and may be manipulated using external stimuli, such as pH, make them a perfect candidate for a quantum-effect-based sensing platform. However, monitoring of the local changes with the use of the nonmodified diamond particles has certain limitations; therefore, to enhance their sensing properties, in this article, the covalent functionalization of the FDPs’ surfaces with poly-L-Lysine (pLys) (NV-pLys) is presented. The FDPs’ surface is functionalized in an anhydrous environment, and successful attachment is confirmed by Fourier transform infrared spectroscopy (FTIR). As the pLys undergoes pH-triggered changes of conformation, it also induces changes in the diamonds’ surface charge, therefore modulating the fluorescence, and finally as a result enhances NV-pLys pH-sensitivity. Further investigation of the zeta potential, particle size, and contact angle reveals remarkable colloidal stability and superior wettability of the NV-pLys over a wide range of pH, which also may significantly affect NV-pLys biocompatibility. These findings open new possibilities for the construction of biocompatible, stable, and highly sensitive nanosensors.
Polylysine for Skin Regeneration: A Review of Recent Advances and Perspectives
- Payam Zarrintaj
- Sadegh Ghorbani
- Mahmood Barani
- Narendra Pal Singh Chauhan
- Mohsen Khodadadi Yazdi
- Mohammad Saeb
- Joshua D. Ramsey
- Michael R. Hamblin
- Masoud Mozafari
- Ebrahim Mostafavi
2022 Pełny tekst Bioengineering & Translational Medicine
There have been several attempts to find promising biomaterials for skin regeneration, among which polylysine (a homopolypeptide) has shown benefits in the regeneration and treatment of skin disorders. This class of biomaterials has shown exceptional abilities due to their macromolecular structure. Polylysine-based biomaterials can not only be used as tissue engineering scaffolds for skin regeneration, but also as drug carriers or even gene delivery vectors for the treatment of skin diseases. In addition, polylysine can play a preservative role in extending the lifetime of skin tissue by minimizing the appearance of photodamaged skin. Research on Polylysine is growing today, opening new scenarios that expand the potential of these biomaterials from traditional treatments to a new era of tissue regeneration. This review aims to address the basic concepts, recent trends, and prospects of polylysine-based biomaterials for skin regeneration. Undoubtedly, this class of biomaterials needs further evaluations and explorations, and many critical questions have yet to be answered.
Polynomial Algorithm for Minimal (1,2)-Dominating Set in Networks
- Joanna Raczek
2022 Pełny tekst Electronics
Dominating sets find application in a variety of networks. A subset of nodes D is a (1,2)-dominating set in a graph G=(V,E) if every node not in D is adjacent to a node in D and is also at most a distance of 2 to another node from D. In networks, (1,2)-dominating sets have a higher fault tolerance and provide a higher reliability of services in case of failure. However, finding such the smallest set is NP-hard. In this paper, we propose a polynomial time algorithm finding a minimal (1,2)-dominating set, Minimal_12_Set. We test the proposed algorithm in network models such as trees, geometric random graphs, random graphs and cubic graphs, and we show that the sets of nodes returned by the Minimal_12_Set are in general smaller than sets consisting of nodes chosen randomly.
Polynomial Chaos Expansion in Bio-and Structural Mechanics
- Katarzyna Szepietowska
2022
This monograph presents a probabilistic approach to modelling the mechanics of materials and structures where the modelled performance is influenced by uncertainty in the input parameters. The work is interdisciplinary and the methods described are applied to medical and civil engineering problems. The motivation for this work was the necessity of mechanics-based approaches in the modelling and simulation of implants used in the repair of ventral hernias. Many uncertainties appear in the modelling of the implant-abdominal wall system. The probabilistic approach proposed in this monograph enables these uncertainties to be propagated to the output of the model and the investigation of their respective influences. The regression-based polynomial chaos expansion method is used here. However, the accuracy of such non-intrusive methods depends on the number and location of sampling points. Finding a universal method to achieve a good balance between accuracy and computational cost is still an open question so different approaches are investigated in this monograph in order to choose an efficient method. Global sensitivity analysis is used to investigate the respective influences of input uncertainties on the variation of the outputs of different models. The uncertainties are propagated to the implant-abdominal wall models in order to draw some conclusions important for further research. Using the expertise acquired from biomechanical models, modelling of historic timber joints and simulations of their mechanical behaviour is undertaken. Such an investigation is important owing to the need for efficient planning of repairs and renovation of buildings of historical value.
Polysaccharide-based electroconductive hydrogels: Structure, properties and biomedical applications
- Mohsen Khodadadi Yazdi
- Payam Zarrintaj
- Farzad Seidi
- Mohammad Saeb
- Masoud Mozafari
2022 CARBOHYDRATE POLYMERS
Architecting an appropriate platform for biomedical applications requires setting a balance between simplicity and complexity. Polysaccharides (PSAs) play essential roles in our life in food resources, structural materials, and energy storage capacitors. Moreover, the diversity and abundance of PSAs have made them an indispensable part of food ingredients and cosmetics. PSA-based hydrogels have been extensively reviewed in biomedical applications. These hydrogels can be designed in different forms to show optimum performance. For instance, electroactive PSA-based hydrogels respond under an electric stimulus. Such performance can be served in stimulus drug release and determining cell fate. This review classifies and discusses the structure, properties, and applications of the most important polysaccharide-based electroactive hydrogels (agarose, alginate, chitosan, cellulose, and dextran) in medicine, focusing on their usage in tissue engineering, flexible electronics, and drug delivery applications.
Polysaccharide-based Nanocomposites for Biomedical Applications: A Critical Review
- Hanieh Shokrani
- Amirhossein Shokrani
- S. Mohammad Sajadi
- Mohsen Khodadadi Yazdi
- Farzad Seidi
- Maryam Jouyandeh
- Payam Zarrintaj
- Saptarshi Kar
- Seokjhin Kim
- Tairong Kuang
- Navid Rabiee
- Aleksander Hejna
- Mohammad Saeb
- Seeram Ramakrishna
2022 Pełny tekst Nanoscale Horizons
Polysaccharides (PSA) are taking specific position among biomaterials for advanced applications in medicine. Nevertheless, poor mechanical properties is known as the main drawback of PSA, which highlights need for PSA modification. Nanocomposites PSA (NPSA) are a class of biomaterials widely used as biomedical platforms, but despite their importance and worldwide use have not been reviewed. Herein we critically reviewed application of NPSA by categorizing them into generic and advanced application realms. First, application of NPSA as drug and gene delivery systems, along with their role in the field as antibacterial platform and hemostasis agent is discussed. Then, applications of NPSA for skin, bone, nerve, and cartilage tissue engineering are highlighted, followed by cell encapsulation and more critically cancer diagnosis and treatment potentials. In particular, three features of investigations devoted to cancer, i.e. radiotherapy, immunotherapy, and photothermal therapy, are comprehensively reviewed and discussed. Since this field experience an early-stage maturity, some other aspects such as bioimaging and biosensing are reviewed in order to give a sensation of potential applications of NPSA for future developments—providing a support for clinical applications. It is well-documented that using nanoparticles/nanomaterials above a critical concentration brings about concerns to toxicity, so that their effect on cellular interactions would become a criticism. We compared nanoparticles used in fabrication of NPSA in terms of toxicity mechanism to shed more lights on future challenging aspects of NPSA development. Indeed, neutralization mechanisms underlying cytotoxicity of nanomaterials, which are expected to be induced by polysaccharide introduction, should be taken into account for future investigations.
Polysaccharides in fabrication of membranes: A review
- Vahid Vatanpour
- Michael Badawi
- Mohammad Saeb
2022 CARBOHYDRATE POLYMERS
Sustainability concerns have motivated and directed a great deal of interest over the past decade towards the development of green technologies. Polysaccharides are green polymers, which experienced growing demand to substitute chemically synthetic polymers. Different types of polysaccharides i.e. cellulose-, starch-, chitin- alginate-, and chitosan-based carbohydrate polymers have been applied in the fabrication of separation membranes. The purpose of the current review was to summarize, classify, and discuss the state-of-the-art the fabrication of membranes with carbohydrate polymers. Specific attention was paid to highlight the strategies used in the successful development of such membranes. First, a brief review of different types of polysaccharides was performed. Next, the application of these polysaccharides in the fabrication of liquid filtration, gas separation, adsorption, pervaporation and proton exchange membranes were comprehensively reviewed. Computational evaluations were also reviewed. Eventually, concluding remarks together with challenging aspects of the future perspective over application of polysaccharide membranes were discussed.
Polyurethane based hybrid ciprofloxacin-releasing wound dressings designed for skin engineering purpose
- Iga Carayon
- Paweł Szarlej
- Przemysław Gnatowski
- Edyta Piłat
- Maciej Sienkiewicz
- Marta Glinka
- Jakub Karczewski
- Justyna Kucińska-Lipka
2022 Pełny tekst Advances in Medical Sciences
Purpose Even in the 21st century, chronic wounds still pose a major challenge due to potentially inappropriate treatment options, so the latest wound dressings are hybrid systems that enable clinical management, such as a hybrid of hydrogels, antibiotics and polymers. These wound dressings are mainly used for chronic and complex wounds, which can easily be infected by bacteria. Materials and methods Six Composite Porous Matrices (CPMs) based on polyurethane (PUR) in alliance with polylactide (PLAs) and poly(vinyl alcohol) (PVA) were prepared and analyzed using optical microscopy. Three different types of hydrogels and their Ciprofloxacin (Cipro) modified variants’ ratios were prepared and analyzed using FTIR, SEM and EDX techniques. Six Hybrid Cipro-Releasing Hydrogel Wound Dressings (H-CRWDs) were also prepared and underwent short-term degradation, Cipro release, microbiology and cell viability measurements. Results Average porosity of CPMs was in the range of 69–81%. The pore size of the obtained CPMs was optimal for skin regeneration. Short-term degradation studies revealed degradability in physiological conditions regardless of sample type. A meaningful release was also observed even in short time (21.76 ± 0.64 μg/mL after 15 min). Microbiological tests showed visible inhibition zones. Cell viability tests proved that the obtained H-CRWDs were biocompatible (over 85% of cells). Conclusions A promising hybrid wound dressing was labeled. Simple and cost-effective methods were used to obtain microbiologically active and biocompatible dressings. The results were of importance for the design and development of acceptable solutions in the management of chronic wounds of high potential for infection.
Pomiar impedancji pętli zwarciowej w instalacjach fotowoltaicznych dużych mocy z magazynowaniem energii
- Jacek Katarzyński
- Jakub Olesz
2022 Pełny tekst Przegląd Elektrotechniczny
W artykule przedstawiono różne konfiguracje przepływu energii w instalacjach fotowoltaicznych z zastosowaniem przekształtników energoelektronicznych o mocy od 10 do 1000 kVA. W pomiarach impedancji pętli zwarciowej (IPZ) w obwodach zasilanych z przekształtników przyrządami różnych producentów zaobserwowano wyniki pomiaru zależne od trybu pracy przekształtnika oraz od wartości wymuszanego prądu probierczego przyrządu. W artykule wskazano na właściwą metodologię pomiaru IPZ w instalacjach fotowoltaicznych z użyciem przekształtników energoelektronicznych z magazynowaniem energii.
Pomiar impedancji pętli zwarciowej w obwodach z wyłącznikami różnicowoprądowymi selektywnymi
- Kornel Borowski
- Stanisław Czapp
2022
Pomiar impedancji pętli zwarciowej w obwodach z wyłącznikami różnicowoprądowymi bezzwłocznymi jest kłopotliwy, ponieważ przy stosowaniu typowych mierników o prądzie pomiarowym rzędu 10-20 A zwykle następują zbędne zadziałania tych zabezpieczeń. W przypadku obwodów z wyłącznikami różnicowoprądowymi selektywnymi jest inaczej. W referacie wykazano, że pomiar ten można wykonać nawet miernikiem wielkoprądowym wymuszającym prąd o wartości szczytowej około 200 A. Przedstawiono przykładowe oscylogramy prądu pomiarowego oraz wyniki badań reakcji wyłączników różnicowoprądowych na pomiar impedancji pętli zwarciowej.
Pomorski Archipelag Wysp Energetycznych
- Andrzej Szajner
- Paweł Bućko
- Katarzyna Grecka
2022 Zeszyty Problemowe Samorząd Pomorza
Omówiono możliwy rozwój energetyki prosumenckiej na terenie województwa pomorskiego. Odniesiono się do form organizacyjnych oraz współpracy lokalnych struktur z systemem elektroenergetycznym.
Pompownie dużej mocy z falownikiem wędrującym średniego napięcia
- Dariusz Karkosiński
2022 Automatyka Elektryka Zakłócenia
Artykuł zawiera rys rozwoju napędów przekształtnikowych w stacjach pomp, w szczególności regulacji wydatku kilku pomp, po kolei, przez jeden przemiennik częstotliwości. Omówiono podstawy teoretyczne zjawiska pola niestłumionego i napięcia resztkowego silników, które utrudniają szybkie przełączania silnika pompy pomiędzy zasilaniem regulowanym przez falownik a zasilaniem z sieci. Przedstawiono zasady transferu (przełączania) synchronicznego pozwalające na minimalizację kosztów inwestycji poprzez konfigurowanie jednego przemiennika częstotliwości średniego napięcia, jako falownika wędrującego, do efektywnej regulacji kilku pomp dużej mocy w pompowni cieczy. Opracowano konfigurację sprzętową krajowej klasycznej - nie specjalizowanej przez wytwórcę falownika, rozdzielnicy SN z wieloma polami silnikowymi. Wykazano, że zaproponowane rozwiązanie jest ekonomiczne uzasadnione w pompowniach o większej liczbie pomp.
Porous Phantoms Mimicking Tissues – Investigation of Optical Parameter Stability Over Time
- Monika Ronowska
2022 Pełny tekst
In terms of optical parameters, optical phantoms can now replace live tissues and be used to validate optical measurement methods. Therefore, whether these parameters would be maintained after storage for 6 months was examined. The absorption and scattering coefficients were obtained from the measured transmittance and reflectance measurements taken 6 months apart and then compared. All of the measurements were conducted using the same experimental setup consisting of an integrating sphere, a light source with a wavelength of 635 nm and a detector. The optical phantoms on which the research was performed were prepared from silicone and glycerol in various proportions.
PORÓWNANIE DZIAŁANIA POPRZECZNYCH ŁOŻYSK ŚLIZGOWYCH NA ZMODERNIZOWANYM STANOWISKU DYDAKTYCZNYM
- Piotr Bzura
- Jakub Kowalski
2022 Pełny tekst Journal of Polish CIMEEAC
W artykule przedstawiono autorską metodę porównania działania poprzecznych łożysk ślizgowych na podstawie wyników badań wykonanych na zmodernizowanym stanowisku laboratoryjnym. Modernizacja stanowiska składającego się ze źródła mocy w postaci silnika elektrycznego napędzającego dwa wały połączone sprzęgłem i zakończone łożyskiem wzdłużnym przekazującym siłę naporu. Podłączenie przetwornika częstotliwości umożliwiło pracę silnika elektrycznego przy różnych prędkościach obrotowych i stałym momencie obrotowym. Na podstawie analizy przeprowadzonych badań został przedstawiony algorytm, według którego porównano ze względu na kierunek i prędkość obrotów oraz sposób smarowania poprzeczne łożyska ślizgowe posadowione na pierwszym wale między silnikiem a łożyskiem oporowym.
Porównanie OpenStack Networking z innymi rozwiązaniami chmurowymi
- Ewelina Kamyszek
- Krzysztof Gierłowski
- Jan M. Kelner
2022 Elektronika : konstrukcje, technologie, zastosowania
W dzisiejszych czasach coraz więcej firm decyduje się na uruchamianie usług oraz przetwarzanie danych w ramach tak zwanych systemów chmurowych, których przykładem może być m.in. OpenStack. Szeroka gama istniejących rozwiązań pozwala na dostosowanie chmury do potrzeb i wymagań użytkownika. Podczas wyboru systemu chmurowego jednym z ważniejszych aspektów jest analiza oferowanych przez niego mechanizmów oraz zaawansowanych usług sieciowych. Poniższy artykuł zawiera podstawowe informacje dotyczące chmury obliczeniowej, najpopularniejszych modułów wykorzystywanych do wdrożenia chmury OpenStack wraz z omówieniem architektury modułu sieciowego OpenStack Networking. Ponadto, przedstawiono porównanie mechanizmów i usług sieciowych oferowanych przez system OpenStack oraz dwa inne systemy chmurowe, tj. Amazon Web Services oraz Apache CloudStack.
Portico Farmhouses of the Vistula Delta: Architecture, Current State and Finite Element Modelling of Timber Roof Truss under Material and Cross-section Uncertainty
- Tomasz Zybała
- Katarzyna Szepietowska
- Grzegorz Bukal
- Izabela Lubowiecka
2022 Pełny tekst International Journal of Architectural Heritage
The article focuses on the oldest surviving I-type portico houses located in the Vistula Delta, which were built in the 17th and 18th centuries. The study describes the houses’ origins, structure, details of roof structures and technical condition, and it also includes numerical modelling of a roof truss and its mechanical analysis. Numerical models of the roof trusses are defined and analysed by means of the finite element method. Global sensitivity analysis with the use of the polynomial chaos expansion method is used to study the influence of uncertainties in material properties of wood, such as Young’s modulus and the friction coefficient, and also the beam cross-sectional height in the output of the numerical model of the structure. The outcomes show that the uncertainty of beam height exerts the dominating influence on the maximum deflection of the roof truss, hence accurate measurements of geometry are of great importance in the planning of conservation and renovation of such historic structures.
Position Estimation in Mixed Indoor-Outdoor Environment Using Signals of Opportunity and Deep Learning Approach
- Sebastian Urwan
- Dominika Wysocka
- Alicja Pietrzak
- Krzysztof Cwalina
2022 Pełny tekst International Journal of Electronics and Telecommunications
To improve the user's localization estimation in indoor and outdoor environment a novel radiolocalization system using deep learning dedicated to work both in indoor and outdoor environment is proposed. It is based on the radio signatures using radio signals of opportunity from LTE an WiFi networks. The measurements of channel state estimators from LTE network and from WiFi network are taken by using the developed application. The user's position is calculated with a trained neural network system's models. Additionally the influence of various number of measurements from LTE and WiFi networks in the input vector on the positioning accuracy was examined. From the results it can be seen that using hybrid deep learning algorithm with a radio signatures method can result in localization error 24.3 m and 1.9 m lower comparing respectively to the GPS system and standalone deep learning algorithm with a radio signatures method in indoor environment. What is more, the combination of LTE and WiFi signals measurement in an input vector results in better indoor and outdoor as well as floor classification accuracy and less positioning error comparing to the input vector consisting measurements from only LTE network or from only WiFi network.
Position in global value chains and wages in Central and Eastern European countries
- Sabina Szymczak
- Aleksandra Parteka
- Joanna Wolszczak-Derlacz
2022 Pełny tekst EUROPEAN JOURNAL OF INDUSTRIAL RELATIONS
This paper examines the relationship between the relative position of industries in Global Value Chains (GVC) and wages in 10 Central and Eastern European countries. We combine GVC measures of global import intensity of production, upstreamness and the length of the value chain with micro-data on workers. We find that the wages of Central and Eastern European countries workers are higher when their industry is at the beginning of the chain or at the end than in the middle. Secondly, wage changes depend on the interplay between upstreamness and GVC intensity. In sectors close to final demand, greater production fragmentation is associated with lower wages.
Possible quadrupole-order-driven commensurate-incommensurate phase transition in B20 CoGe
- S.-H. Baek
- Vladimir Sidorov
- A. V. Nikolaev
- Tomasz Klimczuk
- Filip Ronning
- A. V. Tsvyashchenko
2022 PHYSICAL REVIEW B
The B20-type cobalt germanide CoGe was investigated by measuring the specific heat, resistivity, and 59Co nuclear magnetic resonance (NMR).We observed a phase transition at TQ = 13.7 K, evidenced by a very narrow peak of the specific heat and sharp changes of the nuclear spin-spin (T −1 2 ) and spin-lattice (T −1 1 ) relaxation rates. The fact that the entropy release is extremely small and the Knight shift is almost independent of temperature down to low temperatures as anticipated in a paramagnetic metal indicates that the TQ transition is of nonmagnetic origin. In addition, we detected a crossover scale T0 ∼ 30 K below which the resistivity and the NMR linewidth increase, and T −1 1 is progressively distributed in space, that is, a static and dynamical spatial inhomogeneity develops. While the order parameter for the TQ transition remains an open question, a group-theoretical analysis suggests that the finite electric quadrupole density arising from the low local site symmetry at cobalt sites could drive the crystal symmetry lowering from the P213 symmetry that is commensurate to the R3 symmetry with an incommensurate wave vector, which fairly well accounts for the TQ transition. The quadrupole-order-driven commensurate-incommensurate phase transition may be another remarkable phenomenon arising from the structural chirality inherent in the noncentrosymmetric B20 family.