https://sjgmu.umg.edu.pl/index.php/sjgmu/issue/feedScientific Journal of Gdynia Maritime University2026-06-26T08:45:10+00:00SJGMU Editorial Secretarypublisher@umg.edu.plOpen Journal Systems<p>The Scientific Journal of Gdynia Maritime University (SJ GMU) is an interdisciplinary periodical published continuously since 1975, presenting original results of empirical and theoretical research. Research works published in the Journal mainly focus on broadly understood maritime issues, namely topics related to scientific disciplines such as marine automation, electronic and electrical engineering, civil engineering and maritime transport, mechanical engineering, management and quality sciences, and Earth and related environmental sciences <a href="https://sjgmu.umg.edu.pl/index.php/sjgmu/about">(more).</a><br /><br /><strong>ISSN:</strong> 2657-5841 <strong>e-ISSN: </strong>2657-6988 <strong>DOI:</strong> 10.26408</p>https://sjgmu.umg.edu.pl/index.php/sjgmu/article/view/498DIGITAL TRANSFORMATION IN LOGISTICS CUSTOMER SERVICE OF INTERNATIONAL TRANSPORT ENTERPRISES2026-03-09T18:43:27+00:00Daniel Tokarskidaniel.tokarski@uni.lodz.pl<p>The article examines the impact of digital transformation on logistics customer service in international transport enterprises within the framework of Economy 4.0. A qualitative approach was applied, drawing on a systematic review of 16 peer-reviewed scientific publications and 9 major industry and company reports, complemented by an illustrative examples analysis of Uber Freight, DHL, DB Schenker, and Trans.eu. Findings show that automation, AI, data analytics, and digital interfaces enhance service by enabling personalization, continuous tracking, faster communication, and higher customer satisfaction. Benefits include efficient shipment handling, operational clarity, and responsiveness. However, challenges remain, such as uneven technology adoption and limited data access. The study concludes that digital transformation requires not only technological investment but also organizational change, workforce upskilling, and a customer-focused strategy. It identifies key technologies and provides a comparative analysis of digital platforms. This also addresses the digital transformation in logistics customer service of international transport enterprises, combining interdisciplinary research in the fields of management and quality science with perspectives from economics and finance.</p>2026-06-26T00:00:00+00:00Copyright (c) 2026 Daniel Tokarskihttps://sjgmu.umg.edu.pl/index.php/sjgmu/article/view/509INTEGRATED PORT ENVIRONMENTAL PROCESS MATURITY MODEL – THEORETICAL FRAMEWORK2026-04-15T10:11:20+00:00Jędrzej Charłampowiczj.charlampowicz@wznj.umg.edu.pl<p class="04Streszczenie"><span lang="EN-GB">This paper introduces the Integrated Port Environmental Process Maturity Model (IPEPMM), a theoretical framework aligning environmental process maturity with measurable performance outcomes in maritime ports. The model synthesizes two previously independent approaches: the Environmental Process Maturity (EPM) ladder, which structures environmental capability development, and the Port Environmental Index (PEI), which quantifies environmental outcomes through standardized indicators. By embedding IoT-enabled data governance and stakeholder legitimization into one cohesive system, IPEPMM bridges the gap between process-<br />-based maturity and evidence-based performance. The framework redefines maturity stages as verifiable managerial commitments, linking capability progression to quantitative environmental improvements. This conceptual integration offers both theoretical advancement and practical guidance for achieving accountable, data-driven environmental management in smart ports while outlining directions for empirical validation and model refinement.</span></p>2026-06-26T00:00:00+00:00Copyright (c) 2026 Charłampowiczhttps://sjgmu.umg.edu.pl/index.php/sjgmu/article/view/517NANOSTRUCTURES IN COSMETIC FORMULATIONS2026-02-27T15:47:37+00:00Dobrawa Kwaśniewskadobrawa.kwasniewska@ue.poznan.pl<p>The beginnings of nanotechnology date back to 1959, when Richard Feynman gave his famous lecture that has inspired many scientists. The development of methods of obtaining results (top-down and bottom-up) over the following years has meant that a multitude of nanometric structures are now known, and knowledge about their properties and application possibilities is also broader.</p> <p>Today, cosmetics manufacturers choose nanostructures for several reasons, namely: penetration through the skin, targeted delivery of active ingredients, achieving stability, and obtaining new color elements.</p> <p>This article is a review of the latest knowledge about the properties of nanostructures and their application potential for cosmetic formulations.</p>2026-06-26T00:00:00+00:00Copyright (c) 2026 Dobrawa Kwaśniewskahttps://sjgmu.umg.edu.pl/index.php/sjgmu/article/view/504STORAGE CHANGES IN THE HEALTH POTENTIAL OF MANUKA AND GOLDENROD HONEY DUE TO THERMAL CONDITIONING2026-02-02T08:54:56+00:00Tomasz Puksztat.pukszta@wznj.umg.edu.plMonika Kunzovamonika.kunzova@med.muni.czWiktoria Raszejawiktoriatczew27@wp.pl<p>This study aims to assess the stability of the health potential of manuka and goldenrod honeys during storage. The water content in honeys was determined by refractometry, while the total polyphenol content was determined by the Folin-Ciocalteu method, and the antioxidant activities against the DPPH radical and the ABTS cation were determined. These determinations were made before storage and at 4-week intervals during the 16-week storage of the honeys, at 5°C, 20°C, and 30°C. The results were statistically analyzed using Student’s t-test, multivariate analysis of variance (MANOVA), and Tukey’s post hoc test. The results showed that manuka honey contained significantly more polyphenolic compounds and had a higher antioxidant capacity than goldenrod honey. Storage-induced changes in health potential occurred more rapidly in goldenrod honey than in manuka honey. The rate of these changes was determined by storage temperature. The slowest rate of decomposition was at 5°C, and the fastest at 30°C. Therefore, it can be concluded, that the most favorable temperature for storing opened honey packages is 5°C.</p>2026-06-26T00:00:00+00:00Copyright (c) 2026 Tomasz Pukszta, Monika Kunzova, Wiktoria Raszejahttps://sjgmu.umg.edu.pl/index.php/sjgmu/article/view/500OPTIMAL TIME MOMENTS IN A UNIFORM 1-BULLET SILENT DUEL WITH SCALED EXPONENTIALLY-CONVEX ACCURACY2026-01-27T07:21:16+00:00Vadim Romanukev.romanuke@amw.gdynia.pl<p>The finite 1-bullet silent duel is considered, involving two duelists who shoot with exponentially-convex accuracy through a uniformly quantized time. The duel is a symmetric matrix game whose optimal value is 0, and each of the duelists has the same optimal behavior, whether it is in pure or mixed strategies. The actual beginning is never optimal in the duel. Apart from the very end of the duel, the conditions for the optimal time moment existence are found. Numerical experiments confirm that the optimality can be manipulated by changing the accuracy factor that scales the payoffs. The results are applicable in systems under limited or censored communication with uncertainty, latency, and lucrative delayed actions. Some examples of such set-ups are time-sensitive information release (privacy and censorship), queueing and load balancing (information science and telecommunication systems), and block proposal timing for decentralized consensus protocols (in Proof-of-Work and Proof-of-Stake).</p>2026-06-26T00:00:00+00:00Copyright (c) 2026 Vadim Romanuke