<abstract xmlns="http://www.w3.org/1999/xhtml"> At present jamming is considered one of the main threats to a GPS receiver’s user, both in dynamic and stationary conditions, and especially regarding telecommunication synchronization. Threats stemming from the use of cheap jammers, more and more commonly referred to as Personal Protecting Devices, available on the Internet, are especially dangerous. Despite the formal ban on using them, there is evidence that they are in common use. Therefore the problem which has hitherto been considered marginal needs to be urgently investigated. Reports dealing with investigations on jamming focus mostly on analyses of effects of various jammers on receivers. This article presents part of the results of experiments focused on the effects and it shows that the effects of jamming when the same device is used depend on both the receiver and the antenna it employs.</abstract>

The Significance of an Antenna for Jamming Resistance of a GPS Receiver

<abstract xmlns="http://www.w3.org/1999/xhtml"> This paper presents the data processing methodology for the physical modeling of ocean waves in wave flumes which was developed for the purpose of conducting hydrodynamics research in laboratory conditions. It includes the description of the research cycle, applied wave theory and the measured data processing methods. A significant achievement presented in this paper is the originally developed data analysis algorithm for the practical improvement of the wave generation process.</abstract>

Data Processing Methodology for Experimental Modeling of Ocean Waves

<abstract xmlns="http://www.w3.org/1999/xhtml"> The paper presents operational problems in diagnosing the propulsion system of motor-sail yachts. The advantages and operational problems are presented in the paper and the specificity of use of the propulsion systems. It is shown here solutions to meet the requirements of the marine environment. There are shown exemplary damages resulting from operational errors of crew use. It is proposed program of sea trials, which further operation would be an indispensable diagnostic tool supporting the reliability and safety of the yacht at sea.</abstract>

Propulsion Systems of Motor-Sail Yachts — Problems of Diagnosing

<abstract xmlns="http://www.w3.org/1999/xhtml"> In the article there are summarized author’s results of research carried out in the Department of Basics of Marine Engineering of Polish Naval Academy for the last years. The results of those tests are listed in the selected publications that generally describe the improving impact resistance of the marine aluminium alloys. Using the ballistic dividers, sharing in the same thickness or applying the ceramics state the main methods to increase the impact resistance of the tested alloys. The interlayer aluminium structures are super effective. Their impact strength in relation to the monolithic material rise 3-times. This significantly improves their resistance to piercing by the 7.62 mm missile and the fragmentation (making shrapnel) decreases during the explosion. Each aluminium alloys are protected by the ballistic ceramics of 5 mm thickness with the fire caused by the missile of E = 3kJ. The Armox 500S steel can provide an effective protection for aluminium alloys as a ballistic divider during the fire by the 7,62 mm B32 missile.</abstract>

Impact Resistance of Aluminium Ship Structures

<abstract xmlns="http://www.w3.org/1999/xhtml"> The article presents the results of the first nationwide study of a pro-ecological character, including the problem of the impact of shipping (in a particular basin) on the terrestrial human environment. Shipping in the waters of the Bay of Gdansk is taken as an example of the real system and a detailed identification of the operating conditions for the vessels has been undertaken. Data were obtained from the analysis of information gathered by surveillance systems of vessel traffic (such as Automatic Identification System - AIS) for the complete identification of parameters and characteristics of shipping traffic in the form of deterministic and statistical mathematical models. On the basis of these mathematical models of the emission of harmful exhaust emissions from marine engines have been developed. Models of the spread of exhaust gas are based on the models of Gauss, Euler and Lagrange. Their use has enabled a scientific tool to evaluate the contribution of immission of harmful compounds in the global immission of pollutants in the atmospheric air of the Tri-city agglomeration to be obtained.</abstract>

Modeling of Emissions and Dispersion of Harmful Compounds from Marine Main Propulsion Diesel Engines of Vessels Navigating in Specified Water Basins

<abstract xmlns="http://www.w3.org/1999/xhtml"> The paper presents issues related to the operational safety of lithium-based batteries on vessels. In the first part of the paper the regulations of the Polish Register of Shipping (PRS), regarding the requirements for the batteries on a vessel are analysed. The next section presents the risks related to the use of lithium-based electric energy storage technology. The last part discusses the principles to be adopted during operation of lithium batteries to minimize the risk of threats.</abstract>

Aspects of Safe Operation of Lithium-Based Batteries in Marine Applications

<abstract xmlns="http://www.w3.org/1999/xhtml"> The article presents the aspects of Communication and Information Systems security principles for classified Information Security Management System implemented within the realization of European Defence Agency research and technology projects. In the content of article, author characterised the rules and procedures, resulting from the legal acts, which regulates IT security procedures of classified information processing, obtained during the realisation of research process. Special attention has been focused on the European Defence Agency projects during which common IT security procedures are very important to provide not only the proper level of secrecy but also to ensure confidentiality, integrity and availability of all information processed during the research process.</abstract>

The Principles of Classified Information Protection Handled in Communication and Information Systems Within the Realisation of European Defence Agency Research Projects

<abstract xmlns="http://www.w3.org/1999/xhtml"> The evaluation of the impact of contamination in breathing air intended for hyperbaric purposes is essential both for practical and theoretical reasons. The quality of breathing air and the breathing mixes obtained on its basis is of crucial importance with regard to divers’ safety in the course of underwater works. The existing contaminants, as well as substandard quality gases have an adverse impact on divers’ health and life, both in terms of the physiological impact on the body, and fire hazards in hyperbaric complexes. In the process of breathing air production we deal with a few sources of potential contaminants stemming from technical measures. The human body is also responsible for the release of contaminants in hyperbaric conditions. The article presents the above issues and provides insight into existing threats.</abstract>

Evaluation of the Impact of Breathing Air Contamination on Safe Performance of Hyperbaric Exposure

AHEAD OF PRINT

Volume 224 (2022): Issue 1 (March 2022)

Volume 223 (2020): Issue 4 (December 2020)

Volume 222 (2020): Issue 3 (September 2020)

Volume 220-221 (2020): Issue 1-2 (June 2020)

Volume 219 (2019): Issue 4 (December 2019)

Volume 218 (2019): Issue 3 (September 2019)

Volume 217 (2019): Issue 2 (June 2019)

Volume 216 (2019): Issue 1 (March 2019)

Volume 215 (2018): Issue 4 (December 2018)

Volume 214 (2018): Issue 3 (September 2018)

Volume 213 (2018): Issue 2 (June 2018)

Volume 212 (2018): Issue 1 (March 2018)

Volume 211 (2017): Issue 4 (December 2017)

Volume 210 (2017): Issue 3 (September 2017)

Volume 209 (2017): Issue 2 (June 2017)

Volume 208 (2017): Issue 1 (March 2017)

Volume 207 (2016): Issue 4 (December 2016)

Volume 206 (2016): Issue 3 (September 2016)

Volume 205 (2016): Issue 2 (June 2016)

Volume 204 (2016): Issue 1 (March 2016)

Maritime Technical Journal

 Scientific Journal of Polish Naval Academy has been published since 1959 (in electronic version since 2004). Every year four volumes are published. In this Journal Authors publish their original and previously unpublished scientific articles in the area of technical sciences in English. All the articles contain Polish summaries and key words. All the articles are reviewed by two reviewers. The list of reviewers is published once a year. The Journal has online and printed versions. Why subscribe and read  In the Journal one can find original scientific articles from technical fields, mainly Mechanical Engineering, Electrical Engineering, Geodesy and Cartography. ‘Scientific Journal of Polish Naval Academy’ is an excellent platform for exchanging knowledge and experiences for scientists and experts. Each new issue of the Journal contains articles which present high quality research results of Polish specialists and is an excellent source of professional knowledge for the recipients.  Why submit  Our Journal offers review procedure and short deadlines between sending of the article and approval for publication. All articles are available in Open Access.  The journal has no article processing charges (APCs) and submission processing charges.  Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 