Repository for natural sciences and technology
The repository is used for the free publication of scientific publications from the fields of natural sciences and technology in the sense of Open Access and is open to all authors. The publications placed in the repository are permanently freely available and citable worldwide. The repository is operated by the Technical Information Library (TIB).
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- ItemUnlocking the hidden realms: analysing the Ukrainian journal landscape with Ulrichsweb(Chichester : Wiley, 2024) Nazarovets, MarynaAlthough Ukraine is one of the leading countries in Central and Eastern Europe in terms of its number of scholarly journals, most of these journals are not widely recognized by the scientific community. This paper presents an in-depth analysis of scholarly journal publishing in Ukraine, using data from the Ulrichsweb Global Serials Directory. The study aims to provide insights into the quantity and characteristics of Ukrainian journals, with a specific focus on historical context, publisher diversity, language of publication, and subject distribution. The findings reveal that Ulrichsweb encompasses details on over 1,500 active Ukrainian journal titles, some tracing their origins back to the 19th century. Notably, 85% of these journals are disseminated by academic institutions, including universities and research organizations. This study exemplifies the utility of Ulrichsweb as a valuable tool for investigating national scholarly journals underrepresented in other databases.
- ItemOpen Research Knowledge Graph(Goettingen: Cuvillier Verlag, 2024-05-07) Auer, Sören; Ilangovan, Vinodh; Stocker, Markus; Tiwari, Sanju; Vogt, Lars; Bernard-Verdier, Maud; D'Souza, Jennifer; Fadel , Kamel; Farfar, Kheir Eddine; Göpfert , Jan; Haris , Muhammad; Heger, Tina; Hussein, Hassan; Jaradeh, Yaser; Jeschke, Jonathan M.; Jiomekong , Azanzi; Kabongo, Salomon; Karras, Oliver; Kuckertz, Patrick; Kullamann, Felix; Martin, Emily A.; Oelen, Allard; Perez-Alvarez, Ricardo; Prinz, Manuel; Snyder, Lauren D.; Stolten, Detlef; Weinand, Jann M.As we mark the fifth anniversary of the alpha release of the Open Research Knowledge Graph (ORKG), it is both timely and exhilarating to celebrate the significant strides made in this pioneering project. We designed this book as a tribute to the evolution and achievements of the ORKG and as a practical guide encapsulating its essence in a form that resonates with both the general reader and the specialist. The ORKG has opened a new era in the way scholarly knowledge is curated, managed, and disseminated. By transforming vast arrays of unstructured narrative text into structured, machine-processable knowledge, the ORKG has emerged as an essential service with sophisticated functionalities. Over the past five years, our team has developed the ORKG into a vibrant platform that enhances the accessibility and visibility of scientific research. This book serves as a non-technical guide and a comprehensive reference for new and existing users that outlines the ORKG’s approach, technologies, and its role in revolutionizing scholarly communication. By elucidating how the ORKG facilitates the collection, enhancement, and sharing of knowledge, we invite readers to appreciate the value and potential of this groundbreaking digital tool presented in a tangible form. Looking ahead, we are thrilled to announce the upcoming unveiling of promising new features and tools at the fifth-year celebration of the ORKG’s alpha release. These innovations are set to redefine the boundaries of machine assistance enabled by research knowledge graphs. Among these enhancements, you can expect more intuitive interfaces that simplify the user experience, and enhanced machine learning models that improve the automation and accuracy of data curation. We also included a glossary tailored to clarifying key terms and concepts associated with the ORKG to ensure that all readers, regardless of their technical background, can fully engage with and understand the content presented. This book transcends the boundaries of a typical technical report. We crafted this as an inspiration for future applications, a testament to the ongoing evolution in scholarly communication that invites further collaboration and innovation. Let this book serve as both your guide and invitation to explore the ORKG as it continues to grow and shape the landscape of scientific inquiry and communication.
- ItemВикористання інноваційних інструментів для підтримки та моніторингу відкритої науки(Kyïv : Nacionalʹna akademija kerivnych kadriv kulʹtury i mystectv, 2023-11-15) Kaliuzhna, NataliiaМета статті – дослідити, описати та проаналізувати принципи роботи, зокрема функціональні можливості, сучасних сервісів та інструментів, призначених для моніторингу, підтримки й аналізу розповсюдження результатів наукових досліджень у вільному доступі, які можуть бути використані бібліотекарями для популяризації відкритої науки. Методологія дослідження ґрунтується на комплексі загальнонаукових методів і підходів. Зокрема, було застосовано контент-аналіз офіційних вебсторінок інструментів і сервісів, метод узагальнення, системний, структурно-функціональний та інформаційно-аналітичний методи, що дали змогу підкреслити необхідність створення належної інфраструктури для розвитку відкритої науки. Наукова новизна. У статті розглянуто сучасні інструменти, сервіси та застосунки, такі як OpenAlex, BISON, COKI Open Access Dashboard, Journal Tracker Tool, OPTIMETA Plugins та ін., для підтримки практик відкритої наукової комунікації. Встановлено, що вдосконалення відкритої, некомерційної інфраструктури має потенціал для значного пришвидшення переходу на відкриту модель наукової комунікації. Висновки. Результати дослідження засвідчили наявність інноваційних сервісів для аналізу та моніторингу, які можуть використовуватися бібліотекарями, науковцями та усіма зацікавленими в розвитку відкритого доступу. Ці інструменти є значущими для розширення і демократизації доступу до знань, оскільки сприяють подоланню територіальних, інституційних і дисциплінарних бар'єрів. Удосконалення відкритої, неприбуткової інфраструктури має бути ключовим завданням на шляху до впровадження практик відкритої науки. Сучасним бібліотечним працівникам важливо опанувати навички роботи з відкритими інструментами для моніторингу, аналізу та підтримки практик відкритої наукової комунікації, оскільки очевидним є потенціал онлайн-інструментів у науковій комунікації та їхня здатність поширювати результати наукової діяльності.
- ItemElectronic Preservation Project for Ukrainian Open Access Journals (EPP UA) to Safeguard Research Content during the War(Sharjah : Bentham Science Publishers, 2024) Auhunas, Sabina; Ernert, Saskia; Gutsche, Heike; Kaliuzhna, Nataliia; Zharinova, AllaThis conference paper presents an overview of the ongoing initiative EPP UA — Electronic Preservation Project for Ukrainian Open Access Journals, initiated by TIB – Leibniz Information Centre for Science and Technology and University Library. The EPP UA aims to address the pressing need for preservation of open access journals published and hosted by academic institutions in Ukraine. The heightened risk of destruction from the Russian military invasion jeopardizes both the physical infrastructure of academic institutions and the scholarly knowledge stored within their servers. Given that Ukrainian OA journals rarely utilize long-term preservation services, this initiative emphasizes the urgency to ensure accessibility to research content for future generations of scientists and readers.
- ItemУпровадження принципів відкритого доступу в Україні: сучасний стан і перспективи розвитку(Kyïv : Kyïvsʹkyj nacionalʹnyj universytet kulʹtury i mystectv, 2023-04-24) Kaliuzhna, NataliiaThe purpose of the article is to conduct a comprehensive, objective and critical analysis of the results of research on open access in Ukraine to assess the current state of the topic and identify the aspects which require deeper study in order to develop an effective mechanism for implementing the principles of open access in practice. Research methods. The method of narrative literature review with a defined search strategy and criteria for selecting publications in four databases, such as Dimensions, Scopus, Web of Science and the depository of electronic copies “Scientific Periodicals of Ukraine” was used. The inclusion criteria were articles published by authors affiliated with Ukrainian institutions. The scientific novelty lies in the fact that the literature analysis helped to expand and deepen knowledge about the thematic areas of open access research in Ukraine; to identify previously unknown links and contradictions between studies; and to identify areas that require further studies, which include, in particular, the analysis of factors and barriers that facilitate or prevent Ukrainian authors from disseminating their works in open access, the dynamics of growth and peculiarities of the distribution of the share of open access publications by year and field of study. Conclusions. Open access is one of the main components of Open Science. It serves as a tool for accelerating knowledge sharing, developing science, helping to eliminate inequality, and helping to solve several global problems. The research of Ukrainian scientists focuses on four primary areas of open access research: the development of open access policies at the level of institutions and the state, the introduction of institutional repositories, the launch of open access journals, and the regulation of copyright in open scientific communication.
- ItemSemantic units: organizing knowledge graphs into semantically meaningful units of representation(London : BioMed Central, 2024) Vogt, Lars; Kuhn, Tobias; Hoehndorf, RobertBackground In today’s landscape of data management, the importance of knowledge graphs and ontologies is escalating as critical mechanisms aligned with the FAIR Guiding Principles—ensuring data and metadata are Findable, Accessible, Interoperable, and Reusable. We discuss three challenges that may hinder the effective exploitation of the full potential of FAIR knowledge graphs. Results We introduce “semantic units” as a conceptual solution, although currently exemplified only in a limited prototype. Semantic units structure a knowledge graph into identifiable and semantically meaningful subgraphs by adding another layer of triples on top of the conventional data layer. Semantic units and their subgraphs are represented by their own resource that instantiates a corresponding semantic unit class. We distinguish statement and compound units as basic categories of semantic units. A statement unit is the smallest, independent proposition that is semantically meaningful for a human reader. Depending on the relation of its underlying proposition, it consists of one or more triples. Organizing a knowledge graph into statement units results in a partition of the graph, with each triple belonging to exactly one statement unit. A compound unit, on the other hand, is a semantically meaningful collection of statement and compound units that form larger subgraphs. Some semantic units organize the graph into different levels of representational granularity, others orthogonally into different types of granularity trees or different frames of reference, structuring and organizing the knowledge graph into partially overlapping, partially enclosed subgraphs, each of which can be referenced by its own resource. Conclusions Semantic units, applicable in RDF/OWL and labeled property graphs, offer support for making statements about statements and facilitate graph-alignment, subgraph-matching, knowledge graph profiling, and for management of access restrictions to sensitive data. Additionally, we argue that organizing the graph into semantic units promotes the differentiation of ontological and discursive information, and that it also supports the differentiation of multiple frames of reference within the graph.
- ItemChemical and Structural Comparison of Different Commercial Food Supplements for Silicon Uptake(Basel : MDPI, 2023) Curto, Yannic; Koch, Marcus; Kickelbick, GuidoVarious food supplements for silicon uptake were compared in terms of their structures and chemical compositions. In particular, we analyzed the silanol group content, which can be an indicator of the uptake of the siliceous species in the human body. We analyzed the commercial products Original Silicea Balsam®, Flügge Siliceous Earth Powder, Pure Colloidal Silicon, and BioSil® by applying various methods such as FTIR, 29Si NMR, and TGA. The Si-OH group content of the samples containing pure silica was the highest for the Original Silicea Balsam followed by the Pure Colloidal Silicon. The siliceous earth powder revealed the lowest content of such groups and the densest structure. BioSil® contained a considerable concentration of organic molecules that stabilized orthosilicic acid. The study may help to understand the silicon uptake behavior of different food supplements depending on their chemical structure.
- ItemPolyacrylonitrile-containing amphiphilic block copolymers: self-assembly and porous membrane formation(Cambridge : RSC Publ., 2023) Gemmer, Lea; Niebuur, Bart-Jan; Dietz, Christian; Rauber, Daniel; Plank, Martina; Frieß, Florian V.; Presser, Volker; Stark, Robert W.; Kraus, Tobias; Gallei, MarkusThe development of hierarchically porous block copolymer (BCP) membranes via the application of the self-assembly and non-solvent induced phase separation (SNIPS) process is one important achievement in BCP science in the last decades. In this work, we present the synthesis of polyacrylonitrile-containing amphiphilic BCPs and their unique microphase separation capability, as well as their applicability for the SNIPS process leading to isoporous integral asymmetric membranes. Poly(styrene-co-acrylonitrile)-b-poly(2-hydroxyethyl methacrylate)s (PSAN-b-PHEMA) are synthesized via a two-step atom transfer radical polymerization (ATRP) procedure rendering PSAN copolymers and BCPs with overall molar masses of up to 82 kDa while maintaining low dispersity index values in the range of Đ = 1.13-1.25. The polymers are characterized using size-exclusion chromatography (SEC) and NMR spectroscopy. Self-assembly capabilities in the bulk state are examined using transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS) measurements. The fabrication of isoporous integral asymmetric membranes is investigated, and membranes are examined by scanning electron microscopy (SEM). The introduction of acrylonitrile moieties within the membrane matrix could improve the membranes’ mechanical properties, which was confirmed by nanomechanical analysis using atomic force microscopy (AFM).
- ItemUnderstanding the charging of supercapacitors by electrochemical quartz crystal microbalance(Cambridge : Royal Society of Chemistry, 2022) Niu, Liang; Yang, Long; Yang, Jingjing; Chen, Ming; Zeng, Liang; Duan, Pan; Wu, Taizheng; Pameté, Emmanuel; Presser, Volker; Feng, GuangSupercapacitors are highly valued energy storage devices with high power density, fast charging ability, and exceptional cycling stability. A profound understanding of their charging mechanisms is crucial for continuous performance enhancement. Electrochemical quartz crystal microbalance (EQCM), a detection means that provides in situ mass change information during charging–discharging processes at the nanogram level, has received greatly significant attention during the past decade due to its high sensitivity, non-destructiveness and low cost. Since being used to track ionic fluxes in porous carbons in 2009, EQCM has played a pivotal role in understanding the charging mechanisms of supercapacitors. Herein, we review the critical progress of EQCM hitherto, including theory fundamentals and applications in supercapacitors. Finally, we discuss the fundamental effects of ion desolvation and transport on the performance of supercapacitors. The advantages and defects of applying EQCM in supercapacitors are thoroughly examined, and future directions are proposed.
- ItemHydrogel-Based Flexible Energy Storage Using Electrodes Based on Polypyrrole and Carbon Threads(Weinheim : Wiley-VCH, 2023) Ruthes, Jean G. A.; Deller, Andrei E.; Pameté, Emmanuel; Riegel‐Vidotti, Izabel C.; Presser, Volker; Vidotti, MarcioDeveloping new flexible and electroactive materials is a significant challenge to producing safe, reliable, and environmentally friendly energy storage devices. This study introduces a promising electrolyte system that fulfills these requirements. First, polypyrrole (PPy) nanotubes are electropolymerized in graphite-thread electrodes using methyl orange (MO) templates in an acidic medium. The modification increases the conductivity and does not compromise the flexibility of the electrodes. Next, flexible supercapacitors are built using hydrogel prepared from poly(vinyl alcohol) (PVA)/sodium alginate (SA) obtained by freeze–thawing and swollen with ionic solutions as an electrolyte. The material exhibits a homogenous and porous hydrogel matrix allowing a high conductivity of 3.6 mS cm−1 as-prepared while displaying great versatility, changing its electrochemical and mechanical properties depending on the swollen electrolyte. Therefore, it allows its combination with modified graphite-thread electrodes into a quasi-solid electrochemical energy storage device, achieving a specific capacitance (Cs) value of 66 F g−1 at 0.5 A g−1. Finally, the flexible device exhibits specific energy and power values of 19.9 W kg−1 and 3.0 Wh kg−1, relying on the liquid phase in the hydrogel matrix produced from biodegradable polymers. This study shows an environment friendly, flexible, and tunable quasi-solid electrolyte, depending on a simple swell experiment to shape its properties according to its application.