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Wyświetlanie 1-15 z 2325
Tytuł:
Complex heat exchange in brake friction pairs
Złożona wymiana ciepła w parach ciernych hamulców
Autorzy:
Kernytskyy, I.
Volchenko, D.
Royko, Y.
Zhuravlev, D.
Dolishniy, B.
Bekish, I.
Rys, V.
Humeniuk, R.
Sholudko, Y.
Berezovetska, O.
Szlachetka, O.
Powiązania:
https://bibliotekanauki.pl/articles/28765641.pdf
Data publikacji:
2024
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Źródło:
Acta Scientiarum Polonorum. Architectura; 2024, 23; 32-43
1644-0633
Pojawia się w:
Acta Scientiarum Polonorum. Architectura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method and a model for risk assessment of GNSS utilisation with a proof-of-principle demonstration for polar GNSS maritime applications
Autorzy:
Malić, E.
Sikirica, N.
Špoljar, D.
Filjar, R.
Powiązania:
https://bibliotekanauki.pl/articles/24201434.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
GNSS
GNSS Positioning Performance Degradation
assessment of risk
lonospheric delay
intelligent maritime traffic
maritime applications
polar region
polar navigation
Opis:
The GNSS positioning performance is commonly defined and described in terms unspecified to particular GNSS-based application. The approach causes difficulties to GNSS application developers, operators, and users, rendering the impact assessment of GNSS performance on the GNSS application Quality of Service (QoS) particularly difficult. Here the Probability of Occurrence (PoO) Model is introduced, which allows for a risk assessment of the probability for the GNSS positioning accuracy failure to meet the requirements of the particular GNSS-based application. The proposed PoO Model development procedure requires a large set of position estimation errors observations, which shall cover a range of classes of positioning environment (space weather, troposphere, multi-path etc.) disturbances affecting GNSS positioning accuracy. As result, the PoO Model becomes a tool that returns the probability of failure in meeting the positioning accuracy requirements of the GNSS applications considered, thus providing the input for a GNSS deployment risk assessment. The proposed PoO Model and its development procedure are demonstrated in the case of polar region positioning environment, with raw GNSS pseudorange observations taken at the International GNSS Service (IGS) Network reference station Iqualuit, Canada are used for the PoO Model development. The PoO Model proof-of-principle is then used to estimate the probability of the unmet required positioning accuracy for a number of polar maritime navigation applications. Manuscript concludes with a discussion of the PoO Model benefits and shortcomings, a summary of contribution, and intentions for the future research.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 1; 43--50
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An application of gabions for design of coastal protection structures in lakes
Zastosowanie gabionów do projektowania konstrukcji ochrony wybrzeża w jeziorach
Autorzy:
Šadzevičius, R.
Ramukevičius, D.
Baublys, R.
Sas, W.
Głuchowski, A.
Rzepczyńska, L.
Zając, K.
Powiązania:
https://bibliotekanauki.pl/articles/28765645.pdf
Data publikacji:
2023
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Źródło:
Acta Scientiarum Polonorum. Architectura; 2023, 22; 192-204
1644-0633
Pojawia się w:
Acta Scientiarum Polonorum. Architectura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of pier contact accident in busan new port of south Korea by System-Theoretic Accident Model and Processes (STAMP)
Autorzy:
Kim, S. R.
Wamugi, W. J.
Camliyurt, G.
Kim, D. W.
Park, Y. S.
Powiązania:
https://bibliotekanauki.pl/articles/24201437.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
maritime accidents
investigation on maritime accidents
accident analysis
System-Theoretic Accident Model and Process
maritime safety
safety at sea
pilotage
lesson
Opis:
Marine accidents are caused by complex and diverse causes. Therefore, it is necessary to analyse accidents from the perspective of the whole system rather than the existing analysis models that focus on cause-effect. The STAMP analysis is a constraint-based model that focuses on improper management or enforcement of safety-related constraints in system operation. Thus, as a case study of the application of the STAMP technique in marine accident analysis, the Milano Bridge pier contact accident that occurred on April 6, 2020 in Busan New Port of South Korea was analysed by the STAMP technique in this study. Through this study, it was proposed to break away from the domestic accident investigation, which focused only on the punishment of the ship operator, and to suggest improvements that enable organizations related to the marine accidents to take initiative to take efforts for safety.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 2; 299--304
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applicability of 2,4-dinitrophenylhydrazine (DNPH) method of protein oxidative damage measurement in the seminal plasma of canine (Canis lupus familiaris) and stallion (Equus caballus)
Autorzy:
Mogielnicka-Brzozowska, M.
Woźniak, M.J.
Cichowska, A.W.
Fraser, L.
Kraziński, B.
Strzezek, R.
Zielińska, D.
Powiązania:
https://bibliotekanauki.pl/articles/16647556.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
2,4-dinitrophenylhydrazine
canine
protein carbonylation
seminal plasma
stallion
Opis:
Seminal plasma (SP) proteins are responsible for sperm functional quality. Developing a reliable method to determine the degree of oxidative damage of these proteins is important for establishing semen fertilizing ability. The main aim of the study was to verify the applicability of protein carbonyl derivatives measurement in the SP of canine and stallion, using a method with 2,4-dinitrophenylhydrazine (DNPH). The research material consisted of ejaculates obtained from eight English Springer Spaniels, and from seven half-blood stallions during the breeding and non-breeding season. The content of carbonyl groups in the SP was measured on the basis of the reactions with DNPH. The following reagent variants were used to dissolve protein precipitates: Variant 1 (V1) – 6M Guanidine solution and Variant 2 (V2) – 0.1M NaOH solution. It has been shown that to obtain reliable results for the measurement of protein carbonylated groups in the dog and horse SP, both 6M Guanidine and 0.1M NaOH may be used. A correlation was also found between the number of carbonyl groups and the total protein content in the canine (V1: r = -0.724; V2: r = -0.847) and stallion (V1: r = -0.336; V2: r = -0.334) SP. Additionally, the study showed a higher content (p≤0.05) of protein carbonyl groups in the stallion SP in the non-breeding season compared to the breeding season. The method based on the reaction with DNPH, due to its simplicity and cost effectiveness, appears to be suitable for large-scale application in the determination of the SP proteins oxidative damage in dog and horse semen.
Źródło:
Polish Journal of Veterinary Sciences; 2023, 26, 2; 177-184
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biologically Inspired Energy Efficient Routing Protocol in Disaster Situation
Autorzy:
Chavan, Shankar D.
Thorat, Amruta S.
Gunjal, Monica S.
Vibhute, Anup S.
Desai, Kamalakar R.
Powiązania:
https://bibliotekanauki.pl/articles/2202999.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
WSN
ACO
AAR
path optimization
efficient routing
Opis:
Wireless sensor network (WSN) plays a crucial role in many industrial, commercial, and social applications. However, increasing the number of nodes in a WSN increases network complexity, making it harder to acquire all relevant data in a timely way. By assuming the end node as a base station, we devised an Artificial Ant Routing (AAR) method that overcomes such network difficulties and finds an ideal routing that gives an easy way to reach the destination node in our situation. The goal of our research is to establish WSN parameters that are based on the biologically inspired Ant Colony Optimization (ACO) method. The proposed AAR provides the alternating path in case of congestion and high traffic requirement. In the event of node failures in a wireless network, the same algorithm enhances the efficiency of the routing path and acts as a multipath data transmission approach. We simulated network factors including Packet Delivery Ratio (PDR), Throughput, and Energy Consumption to achieve this. The major objective is to extend the network lifespan while data is being transferred by avoiding crowded areas and conserving energy by using a small number of nodes. The result shows that AAR is having improved performance parameters as compared to LEACH, LEACH-C, and FCM-DS-ACO.
Źródło:
International Journal of Electronics and Telecommunications; 2023, 69, 1; 163--168
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CERP: a maritime cyber risk decision making tool
Autorzy:
Erstad, E.
Hopcraft, R.
Palbar, J. D.
Tam, K.
Powiązania:
https://bibliotekanauki.pl/articles/24201418.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
maritime cyber resilience
maritime cyber security
cyber risk management
safety and security
emergency response procedures
cyber incident response
risk mitigation
maritime cyber threats
Opis:
An increase in the complexity of systems onboard ships in the last decade has seen a rise in the number of reported maritime cyber-attacks. To tackle this rising risk the International Maritime Organization published high-level requirements for cyber risk management in 2017. These requirements obligate organisations to establish procedures, like incident response plans, to manage cyber-incidents. However, there is currently no standardised framework for this implementation. This paper proposes a Cyber Emergency Response Procedure (CERP), that provides a framework for organisations to better facilitate their crew’s response to a cyber-incident that is considerate of their operational environment. Based on an operations flowchart, the CERP provides a step-by-step procedure that guides a crew’s decision-making process in the face of a cyber-incident. This high-level framework provides a blueprint for organisations to develop their own cyber-incident response procedures that are considerate of operational constraints, existing incident procedures and the complexity of modern maritime systems.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 2; 269--279
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cyberchondria among information technology professionals of Bhubaneswar by using cyberchondria severity scale (CSS-15)
Autorzy:
Satyarup, D.
Panda, S.
Nagarajappa, R.
Mohapatra, U.
Powiązania:
https://bibliotekanauki.pl/articles/28765535.pdf
Data publikacji:
2023
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Opis:
Background. Internet can act as an excellent resource for gaining valuable health related information. However, excessive online research and investigation about health-related issues may impose a negative impact. The term cyberchondria is used to describe a clinical condition in which frequent internet searches for health-related information leads to exaggerated anxieties about physical well-being. Objectives. To determine the prevalence of cyberchondria and associated factors among the information technology professionals of Bhubaneswar in India. Materials and methods. A cross-sectional study was carried out among 243 software professionals in Bhubaneswar using a previously validated Cyberchondria Severity Scale (CSS-15) questionnaire. Descriptive statistics in terms of number, percentage, mean and standard deviation were presented. Independent t-test and one-way analysis of variance was applied to compare the cyberchondria score between two and more than two independent variables respectively. Results. From 243 individuals 130 (53.5%) were males and 113 (46.5%) were females with mean age 29.82±6.67 years. The prevalence of cyberchondria severity was found to be 46.5%. The mean cyberchondria score of all study subjects was 43.80±10.62. It was significantly higher among those who spend more than 1 hour in the internet during night, feel fear and anxiety in visiting the doctor or dentist, interested in gaining the health-related information from other resources and agreed that gaining health related information has increased after COVID-19 pandemic (p˂0.05). Conclusion. Cyberchondria is a growing issue with regard to mental health in developing countries and has the ability to cause anxiety and distress. Appropriate actions must be taken to prevent it on a societal level.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2023, 74, 1; 83-91
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dochodzenie epizootyczne - administracyjny środek zwalczania chorób zakaźnych zwierząt
Epizootic investigation - administrative measure for combating the animal infectious diseases
Autorzy:
Welz, M.
Niemczuk, P.
Jażdżewski, K.
Filianowicz, D.
Białowąs, J.
Kondrat, R.
Łoś, P.
Waksmundzka-Szarek, M.
Ciołek, J.
Witkowski, L.
Powiązania:
https://bibliotekanauki.pl/articles/28763459.pdf
Data publikacji:
2023
Wydawca:
Krajowa Izba Lekarsko-Weterynaryjna
Tematy:
weterynaria
choroby zwierzat
choroby zakazne
epidemie
zwalczanie chorob zwierzat
srodki administracyjne
dochodzenie epizootyczne
Inspekcja Weterynaryjna
Źródło:
Życie Weterynaryjne; 2023, 98, 02; 77-82
0137-6810
Pojawia się w:
Życie Weterynaryjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and numerical investigations on dynamic tensile behavior of a ZrB2-SiC ceramic
Autorzy:
He, R.
Cao, J.
Yang, K.
Wang, L.
Kong, D.
Powiązania:
https://bibliotekanauki.pl/articles/38695710.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
ZrB2-SiC ceramic
dynamic tensile properties
fracture pattern
strain rate
peridynamic model
Opis:
The dynamic tensile behavior of a ZrB2-SiC ceramic was investigated via split Hopkinson pressure bar tests and a bond-based peridynamic model. The experimental results showed that the peak dynamic splitting tensile stress increased linearly with the strain rate. The dynamic tensile stress history and fracture pattern exhibited a significant strain-rate dependence. In simulation, the strain-rate dependent on the critical energy release rate was introduced to predict the dynamic tensile behavior of the ZrB2-SiC ceramic. The numerical results were in good agreement with the experimental results, verifying the applicability of the peridynamic model. The maximum error of the peak dynamic splitting tensile stress between the experimental and numerical results was no greater than 6%. Moreover, the effect of the strain rate on the fracture patterns of the ZrB2-SiC ceramic composite can be well predicted by the peridynamics method. The ZrB2-SiC composite specimen split into two large fragments with additional small fragments under dynamic splitting tension. With the increase of strain rate, the main crack propagation and branching led to a larger fracture region in the middle of the specimen.
Źródło:
Archives of Mechanics; 2023, 75, 1-2; 53-73
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Expert as interviewer – methodological challenges in use of qualitative interviews in maritime research
Autorzy:
Sharma, D. R.
Powiązania:
https://bibliotekanauki.pl/articles/24201425.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
expert interview
qualitative interview
research interview
maritime research
research method
Interview challenges
ualitative methods
methods challenges
Opis:
Interviews are a widely used method in maritime research using qualitative methodologies. Expert interviews are conducted with people who have special knowledge because of their professional position. The status of the interviewer when using expert interviews brings forth certain distinct nuances due to the specific nature of the interview methodology and epistemological considerations. A renowned and senior maritime specialist or a veteran maritime professional researching the nuances of their own field encounter methodological challenges while interviewing other experts during data collection. The paper aims to examine the impact on qualitative data collected in interviews when the interviewers themselves are experts in the field of research. The concepts from the social science research from various disciplines have been examined and discussed highlighting the methodological challenges.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 3; 638--642
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First cases of alveolar echinococcosis in dogs in Poland
Autorzy:
Jańczak, D.
Skibiński, F.
Borkowski, A.
Jerchewicz, M.
Włodarz, K.
Klimiuk, P.
Sapierzyński, R.A.
Gawor, J.
Powiązania:
https://bibliotekanauki.pl/articles/28763040.pdf
Data publikacji:
2023
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2023, 30, 3; 561-565
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on surface roughness and kerf analysis in abrasive water jet machining of silicon carbide
Autorzy:
Hynes, N.R.J.
Asirvatham, A.D.
Sankaranarayanan, R.
Raja, S.
Benita, B.
Atchaya, J.
Powiązania:
https://bibliotekanauki.pl/articles/24200627.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
ceramic
cutting
abrasive water jet machining
ceramika
cięcie
cięcie strumieniem wodno-ściernym
Opis:
Purpose: Machining silicon carbide (SiC) is challenging due to its brittle and maximum tensile nature. Lapping or laser beam are done with a high cost of manufacturing and low material removal rates. Water abrasive jet cutting is a promising candidate since the machining temperatures and processing force of ceramics are extremely low. Investigation into the abrasive water jet machining of silicon carbide is carried out in the present work. Design/methodology/approach: The variations in traverse speed while abrasive water jet cutting of silicon carbide and its effect on the surface roughness and kerf characteristics are studied. Silicon Carbide abrasive material is used as garnet consisting of 80 mesh. The surface roughness was calculated along with the depth of the cut made during the processing. Findings: The outcomes demonstrated that the traverse speed is more effective upon the surface roughness and is an important factor that damages the top kerf width and the kerf taper angle. Research limitations/implications: Based on the hardness and thickness of the SiC plate, the taper angle is high, and for a feed rate of 10 mm/min, the surface roughness is low. Less thickness of the SiC plate could have a lower taper angle than with high thickness. The erosive force is provided by abrasive material along with the jet stream. Practical implications: Water abrasive fine jet could effectively machinate silicon carbide ceramic material with a better surface finish accurately. Suitable surface roughness with higher productivity can be attained with medium traverse speed. Originality/value: The effect of process parameters on kerf taper angle and top kerf width in the abrasive water jet machining of silicon carbide is explored, considering surface roughness as an important output parameter.
Źródło:
Archives of Materials Science and Engineering; 2023, 120, 1; 30--35
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 2325

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