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    Wyświetlanie 1-16 z 16
    Tytuł:
    The strength behaviour of transitional group A-2-7 soil stabilized with fly ash and lime powder
    Autorzy:
    Ahmad, Omar Asad
    Powiązania:
    https://bibliotekanauki.pl/articles/2073877.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gleba
    popiół lotny
    geotechnika
    soil stabilisation
    lime powder
    flyash
    TGA-2-7 soil
    engineering index
    Opis:
    Recent works aimed to investigate geotechnical properties of Transitional Group A-2-7 (TGA-2-7) soil affected by the use of hydrated lime and fly ash class F, by-products from quarries and a cement factory in Jordan, to compensate for the gap in the granular distribution. Host soil was exposed to various proportions of fly ash and lime powder. The blended specimens were subjected to different tests related to index properties, including Atterberg limits, compaction properties and California bearing ratio. The results demonstrate that 2% fly ash led to a reduction in the plasticity index from 19% to 10%, while lime powder reduced it from 19% to 13%. A sufficient improvement of maximum dry density was observed at 20% lime addition and increased from 15.11 kN/m3 to 16.29 kN/m3. California bearing ratio that measures the strength soil linearly increased up to 10% induced by 20% lime addition.
    Źródło:
    Archives of Mining Sciences; 2021, 66, 4; 511--522
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Doing Hirsch proud; shaping H-index in engineering sciences
    Autorzy:
    Czarnecki, L.
    Kaźmierkowski, M.
    Rogalski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/202004.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bibliometric indicators
    citations
    citation metrics
    h-index
    country rank
    SCImago indicator
    disciplines
    domestic Engineering sub-disciplines
    statistics
    Opis:
    The h-index concept has been analysed in aspects of a contemporary tendency of parameterisation of everything and as the potential measure of the knowledge progress, which recognises individuals, institutions and Engineering sub-disciplines that best generate new knowledge. Considerations have been presented at the level of universality of knowledge which implies permanent progress and on the base of careful thoughts of the domestic experience. The h-nature of things has been described, and several axiomatic characterisations of the Hirsch index have been gathered. The mechanism how to increase the h-index has been presented. Some similarities between h-index and the journal impact factor (JIF) have been stressed. Also the universal role of H-index in ranking countries in all areas and in Engineering has been exampled in extended tables. The Glänzel’s model which connects the h-index with two fundamental scientometric indicators: number of publications and the rate of citation, has been analysed. Following the Microsoft Academic Search, the lists of 15 top scientists from various academic disciplines and separately in Engineering have been composed. It has been found that the population of the best keeps basically the same relations between the h-index and a number of publication, and between the h-index and a citation number. However, even the best in Engineering should publish 2 times a year or more papers to receive the same h-index as top scientists in overall domains. The h-index distribution of domestic Engineering sub-disciplines has been presented and analysed in statistic categories. The suitable hhistograms and the cumulative probability density function (CPDF) have been elaborated for 21 sub-disciplines and thereupon the Engineering sub-disciplines have been arranged into three clusters. It has been demonstrated that Engineering as the whole and Engineering sub-disciplines are underestimated, compared to other academic disciplines. The adequate normalisation factors have been suggested. Several other conclusions considered the h,H-indices as the measure of the knowledge progress addressed to individual researchers and to collective, e.g., journals, institutions, organisations, countries, adequately have been written. The h,H-indices are the general measure of the position of the given subject (person or organisation) but cannot be universal.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 1; 5-21
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polski indeks rynku węgla
    Polish steam coal market index
    Autorzy:
    Hibner, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/103429.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
    Tematy:
    węgiel kamienny
    ceny zbytu węgla energetycznego
    energetyka zawodowa
    ciepłownie zawodowe
    polski indeks węgla energetycznego
    coal
    Polish Steam Coal Market Index
    selling price of coal
    power engineering
    heating
    Opis:
    Podstawowym nośnikiem energii w polskiej gospodarce jest węgiel kamienny. Ze względu na tak wysoki udział w bilansie energetycznym ważnym jest zagwarantowanie stabilnych i przewidywalnych cen tego surowca. Dlatego też dla rynku wewnętrznego Agencja Rozwoju Przemysłu S.A. i Towarowa Giełda Energii S.A. postanowiły utworzyć Polskie Indeksy Rynku Węgla Energetycznego PSCMI. W artykule omówiono indeksy dla węgla sprzedawanego na krajowym rynku dla energetyki (PSCMI 1) i ciepłownictwa (PSCMI 2). Omówiono również trendy cenowe i analizę zmian cen dla tych indeksów.
    Coal is the primary energy carrier in the Polish economy. Due to such a high share of the energy balance, it is important to guarantee stable and predictable prices of this raw material. Therefore, for the internal market, the Industrial Development Agency S.A. And Towarowa Giełda Energii S.A. They decided to set up the Polish Index of PSCMI Energy Market. The indices for carbon sold on the domestic market for energy (PSCMI 1) and district heating (PSCMI 2) are discussed. Price trends and price developments for these indices are also discussed.
    Źródło:
    Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Technika, Informatyka, Inżynieria Bezpieczeństwa; 2018, T. 6; 81-89
    2300-5343
    Pojawia się w:
    Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Technika, Informatyka, Inżynieria Bezpieczeństwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of ecological hazards to atmosphere and waters around floating docks in service by using an index method
    Autorzy:
    Jabłoński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/260388.pdf
    Data publikacji:
    2005
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    dock designing
    engineering processes
    environment protection
    Opis:
    Identification of ecological hazards was performed on the example of analysis of operational conditions of a floating dock in a ship repair yard. The following issues were described and discussed : - classification and valorization of repair work operations - alternative ecological engineering processes - guidelines for designing new environment-friendly docks - model of environment-friendly dock
    Źródło:
    Polish Maritime Research; 2005, S 1; 25-29
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Equivalent availability index for the performance measurement of haul truck fleets
    Autorzy:
    Kristjanpoller, Fredy
    Viveros, Pablo
    Zio, Enrico
    Pascual, Rodrigo
    Aranda, Oscar
    Powiązania:
    https://bibliotekanauki.pl/articles/1841923.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    performance assessment
    reliability engineering
    production management
    availability
    Opis:
    This article presents a model of performance analysis for a truck fleet system in an openpit mine, considering special characteristics of haul fleets. In these systems, the expected availability of each piece of equipment and its operating capacity are the fundamental variables to construct a global fleet performance function. Our analytical algorithm considers heterogeneous fleets with known individual characteristics of transport capacity and failure and repair behavior. The results converge to a new indicator denominated “Equivalent Availability” (EA), which arises from the need to evaluate the capacity of the truck fleet to operate at a lower payload than required using different combinations of equipment to achieve an availability goal. EA is a key indicator to determine the productive capacity of a process, and for selecting equipment and their combinations to achieve production objectives. To exemplify the potentialities of the EA, a case study is implemented in a Chilean copper truck fleet mining process.
    Źródło:
    Eksploatacja i Niezawodność; 2020, 22, 4; 583-591
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Change on detection of vegetation cover and soil salinity using GIS technique in Diyala Governorate, Iraq
    Autorzy:
    Adeeb, Haneen Q.
    Al-Timimi, Yaseen K.
    Powiązania:
    https://bibliotekanauki.pl/articles/35519874.pdf
    Data publikacji:
    2021
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    differencing image
    normalized difference
    vegetation index
    NDVI
    salinity index
    GIS
    Iraq
    Opis:
    Soil salinity is one of the most important problems of land degradation, that threatening the environmental, economic and social system. The aim of this study to detect the changes in soil salinity and vegetation cover for Diyala Governorate over the period from 2005 to 2020, through the use of remote sensing techniques and geographic information system. The normalized difference vegetation index (NDVI) and salinity index (SI) were used, which were applied to four of the Landsat ETM+ and Landsat OLI satellite imagery. The results showed an increase in soil salinity from 7.27% in the period 2005–2010 to 27.03% in 2015–2020, as well as an increase in vegetation from 10% to 24% in the same period. Also the strong inverse correlation between the NDVI and the SI showed that vegetation is significantly affected and directly influenced by soil salinity changes
    Źródło:
    Scientific Review Engineering and Environmental Sciences; 2021, 30, 1; 148-158
    1732-9353
    Pojawia się w:
    Scientific Review Engineering and Environmental Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spatial mapping of the leaf area index using remote sensing and ground measurements – the Biebrza National Park case study
    Autorzy:
    Ignar, Stefan
    Szporak-Wasilewska, Sylwia
    Gregorczyk, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/36062944.pdf
    Data publikacji:
    2023
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    leaf area index
    wetlands
    remote sensing
    spectral vegetation indices
    Biebrza
    Opis:
    The purpose of the described research was an attempt to estimate the leaf area index (LAI) parameter describing the structure of the vegetation based on the Landsat 5TM satellite imagery and field measurements made with the use of an optical plant canopy analyzer. The study was carried out in north-eastern Poland in the Biebrza river valley within the boundaries of the Biebrza National Park during the growing season of the year 2007. There were 13 spectral indices given in the literature known to be correlated with the LAI. The highest coefficient of determination and the highest correlation coefficient were obtained for the normalized difference vegetation index (NDVI) and the soil adjusted vegetation index (SAVI) indices for the wetland areas in the Biebrza river valley. The field measurements of the leaf area index and its spatial representation on satellite image show that the vegetation of natural river valleys is characterized by high spatial and seasonal variability. The study of the LAI on such large natural areas that are extensively used also requires knowledge of the methods of land use and the application of individual agrotechnical measures.
    Źródło:
    Scientific Review Engineering and Environmental Sciences; 2023, 32, 2; 175-185
    1732-9353
    Pojawia się w:
    Scientific Review Engineering and Environmental Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermally treated clay as a stabilizing agent for expansive clayey soil: some engineering properties
    Autorzy:
    Al-Swaidani, A. M.
    Hamood, I.
    Meziab, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/178836.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    thermally treated clay
    soil improvement
    plasticity index
    linear shrinkage
    Opis:
    The objective of this research was to investigate the effect of adding thermally treated clay on some engineering properties of the untreated expansive clayey soil. Three expansive clayey soil samples obtained from three different sites in the south of Syria have been investigated. They were thermally treated up to three different levels (450°C, 650°C and 850°C) for 3 hours. Three replacement levels of thermally treated clay were used, i.e. 0%, 10% and 20%. The X-ray diffractometer (XRD) technique has been used to detect the crystalline and glassy phase in the clayey samples before and after the thermal treatment. Pozzolanic activity of the thermally treated clayey soil has been studied using the modified Chapelle test and the mechanical strength test at each of the temperature levels. Atterberg limits, compaction, free swell, swelling pressure and linear shrinkage have particularly been investigated. Test results revealed the positive effect of thermally treated clay when added to the natural soil. Plasticity index (PI) was reduced by about 60% when 20% thermally treated clay was added to the natural soil. In addition, 6% lime was added to further investigate the combined effect of lime and calcined clay on the properties of the clayey expansive soil. All investigated properties were significantly improved when 20% thermally treated soil and 6% lime were added together. For instance, swelling pressure and linear shrinkage values were reduced to less than 15% or even much less when compared with those of the natural soil. Scanning electron microscopy (SEM) and energydispersive X-ray (EDX) analysis were employed as well.
    Źródło:
    Studia Geotechnica et Mechanica; 2018, 40, 3; 220-232
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of Global Research Activities in Mechanical Engineering via Bibliometric Analysis
    Autorzy:
    Güven, F.
    Demirkale, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/139755.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bibliometric analysis
    research trends
    h-index
    research management
    scientometrics
    analiza bibliometryczna
    kierunki badawcze
    indeks Hirscha
    zarządzanie badaniami
    scientometria
    Opis:
    This study reveals significant and emergent research topics in the field ‘engineering, mechanical’ through bibliometric analysis of articles indexed in Web of Science (WoS) from 1997 to 2016. Publications under consideration (219,191 articles) were examined using quantitative and qualitative methods to evaluate general information about publications; evolution of research topics by keyword analysis; performance of countries, research centers and journals; and international collaborations. There was a threefold increase in number of articles throughout the period. The publications were related to 35 WoS categories; and mechanics and thermodynamics were dominating ones. International Journal of Heat and Mass Transfer was the leading journal in the field. The USA and China were outstanding countries of the field. Collaboration between these countries corresponded to 6.57% of all collaborative publications. Industrialized and developing countries dominated research activities in the field. Indian Institute of Technology was the leading research center due to number of publications. The results showed that heat transfer, finite element method, friction, wear, simulation, and fatigue are important topics of the field. There is an upward trend in research related to nanofluids, microchannel, phase change materials, and carbon nanotubes.
    Źródło:
    Archive of Mechanical Engineering; 2018, LXV, 1; 171-188
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Indicator analysis of the technological position of a manufacturing company
    Autorzy:
    Pacana, Andrzej
    Czerwińska, Karolina
    Powiązania:
    https://bibliotekanauki.pl/articles/26080822.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    wskaźniki wydajności
    przemysł metalurgiczny
    zarządzanie jakością
    inżynieria mechaniczna
    analiza indeksu
    key performance indicators
    metal industry
    quality management
    mechanical engineering
    index analysis
    Opis:
    A turbulent manufacturing market, especially in the metal industry, determines the quality of products and the level of production efficiency, which contributes to a company's market position and competitiveness. The aim of the study was to develop a model to define a manufacturing company’s current market position using KPIs in relation to a key product - gearbox casting. The company's position was defined in terms of the relationship occurring between technological capabilities and market position. An additional aim of the study was to identify critical determinants and, ultimately, to identify conditions for strengthening market position. As a test of the proposed model, the position of the analysed company (in terms of technological capabilities and market position) was defined as “Search for occasions”- box 9 within the 3x3 matrix. Technological determinants that weaken the company’s position (low level of maintenance capacity and long production cycle time) and determinants with a strong negative impact on market position (low level of human resource development) were identified. An element of novelty is the use of KPIs as variables determining the position of the company within the3x3 matrix, which is indicative of a specific technological position in the market. Further lines of research will concern the determination of appropriate KPIs in relation to the identified critical areas of the company. Subsequent steps will concern the implications of the model in relation to the company’s other key aluminium alloy castings.
    Źródło:
    Production Engineering Archives; 2023, 29, 2; 162--167
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Właściwości geologiczno-inżynierskie glin zwałowych z północnej części Wrocławia
    The engineering-geological properties of the tills from the northern part of Wrocław
    Autorzy:
    Hawrysz, M.
    Stróżyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2062974.pdf
    Data publikacji:
    2011
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    glina zwałowa
    granice Atterberga
    stan skonsolidowania
    wskaźnik ściśliwości
    wytrzymałość na ścinanie
    tills
    Atterberg limits
    consolidation state
    compressibility index
    shear strength resistance
    Opis:
    W pracy przedstawiono wyniki badań geologiczno-inżynierskich gliny zwałowej z północnej części Wrocławia. Przeprowadzono badania podstawowych parametrów geotechnicznych: gęstości, wilgotności, granic Atterberga oraz parametrów mechanicznych gruntów: ściśliwości i wytrzymałości na ścinanie. Badania wykazały, że gliny te występują zwykle w konsystencji bardzo zwartej i zwartej. Stan skonsolidowania glin określono jako normalny – NC. Na podstawie wartości wskaźnika ściśliwości Cc oceniono, że grunty te charakteryzują się średnią ściśliwością.
    The results of engineering-geological tests on the tills from Wroclaw area are presented in the paper. The basic geotechnical parameters, such as density, water content, Atterberg limits and mechanical parameters: compressibility and strength parameters have been determined in the research. The tests have shown that the consistency of the tills is usually very stiff or stiff. The consolidation state has been estimated as normally consolidated — NC. The value of compressibility index Cc allowed classifying the analyzed soils as of average compressibility.
    Źródło:
    Biuletyn Państwowego Instytutu Geologicznego; 2011, 446 (2); 315--320
    0867-6143
    Pojawia się w:
    Biuletyn Państwowego Instytutu Geologicznego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Residual strength and toughness after impact loading for RC slabs strengthened with different layers of geogrid
    Autorzy:
    Ahmed, Aya M. E.
    Hamdy, Osman
    Saad, Youssef L. Z.
    Ahmad, Seleem S. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/36064265.pdf
    Data publikacji:
    2023
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    impact load
    geogrid
    RC slab
    residual strength
    static flexural load
    toughness
    toughness index
    Opis:
    This study presents an experiment for investigating the residual strength and toughness of reinforced concrete, RC, and slab reinforced by a geogrid as shrinkage reinforcement along with lower tensile steel reinforcement. Three different parameters were considered, slab thickness, number of geogrid layers, and thickness of the upper concrete cover. Fifteen slab samples with sizes of 50 × 50 cm exposed to the impact load on its center before being re-load by the static load and six slab samples exposed to the static load only. The load and deflection relation were recorded through the static loading process for all specimens, where loading capacity, toughness, and toughness index were measured. The results show an enhancement in the slabs residual strength as the slab thickness and concrete cover increased. On the other hand, the residual strength of slabs has a remarkable decrease with the increase in geogrid layers. Moreover, the toughness has a positive relationship with the concrete cover and has an inverse relation with the slab thickness and the number of layers. A geogrid reduced the number and distribution of cracks and mitigated their severity, especially for double layers with the same concrete cover.
    Źródło:
    Scientific Review Engineering and Environmental Sciences; 2023, 32, 2; 117-134
    1732-9353
    Pojawia się w:
    Scientific Review Engineering and Environmental Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Patterns of relationship between PM10 from air monitoring quality station and AOT data from MODIS sensor onboard of Terra satellite
    Autorzy:
    Suriya, Winai
    Chunpang, Poramate
    Laosuwan, Teerawong
    Powiązania:
    https://bibliotekanauki.pl/articles/35535233.pdf
    Data publikacji:
    2021
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    remote sensing
    MODIS sensor
    PM10
    aerosol optical thickness
    AOT
    air quality index
    AQI
    Opis:
    Thailand, especially in the northern region, often encounters the problem of having PM10 exceeding the normal standard level, which could do harm to people’s health. Mostly, such problem is caused by the burning of forest area and open area; this is clearly seen during January–April of every year. Also, the problem as mentioned is caused by the meteorological conditions and the terrains in the northern region that make it easy for PM10 to be accumulated. The aim of this study was to analyze the patterns of relationship between PM10 measured from the ground monitoring station and AOT data received from MODIS sensor onboard of Terra satellite in Phrae Province located in the northern region of Thailand. The method performed was by analyzing the correlation between PM10 data obtained from the ground monitoring station and the AOT data received from the MODIS sensor onboard of Terra satellite during January–April 2018. It was found from the study that the change of the intensity of PM10 and AOT in the climate was highly related; it appeared that the correlation coefficient (r) in January–April was 0.92, 0.91, 0.91 and 0.92, respectively. This research pointed out that during February– –April, the areas of Phrae Province had the level of PM10 that affected health. Besides, from the method in this research, it revealed AOT data received from MODIS sensor onboard of Terra satellite could be applied in order to follow up, monitor, and notify the spatial changes of PM10 efficiently.
    Źródło:
    Scientific Review Engineering and Environmental Sciences; 2021, 30, 2; 236-249
    1732-9353
    Pojawia się w:
    Scientific Review Engineering and Environmental Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study on the Propulsion Performance in the Actual Sea by means of Full-scale Experiments
    Autorzy:
    Kayano, J.
    Yabuki, N.
    Sasaki, N.
    Hiwatashi, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/116354.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Propulsion Performance
    Propulsion
    mechanical engineering
    Energy Efficiency Design Index (EEDI)
    Ship Energy Efficiency Management Plan (SEEMP)
    Energy Efficiency Operational Indicator (EEOI)
    Self Propulsion Factors
    Power Curves
    Opis:
    The IMO has adopted Energy Efficiency Design Index (EEDI), Ship Energy Efficiency Management Plan (SEEMP) and Energy Efficiency Operational Indicator (EEOI) in order to reduce GHG emissions from international shipping. And, the shipping industry is required to develop and improve the energy saving ship operation technologies to meet the above IMO guideline. The weather routing is one of the energy saving navigation technologies and widely adopted by oceangoing merchant ships. The effectiveness of the weather routing mainly depends on the accuracy of weather forecast data and the ship’s propulsion performance prediction. The propulsion performance in the actual sea is usually predicted using the Self Propulsion Factors obtained by model tests. It is necessary to understand the propulsion performance characteristics in the actual sea conditions for the improvement of propulsion performance prediction. From the above points of view, the authors performed full‐scale experiments using a training ship in order to investigate the propulsion performance characteristics in the actual sea. This paper describes the analysis results on the characteristics of Power Curves and Self Propulsion Factors under various weather and sea conditions.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 4; 521-526
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wytwarzanie porowatych rusztowań z poli(3-hydroksymaślanu-ko-3-hydroksywalerianu) za pomocą techniki szybkiego prototypowania
    Fabrication of porous poly (3-hydroxybutyrate- co-3-hydroxyvalerate) scaffolds using a rapid prototyping technique
    Autorzy:
    Kublik, Ż.
    Idaszek, J.
    Święszkowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/283978.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    PHBV
    PLGA
    wskaźnik szybkości płynięcia
    inżynieria tkankowa
    technika szybkiego prototypowania
    melt flow index
    MFR
    tissue engineering
    rapid prototyping
    Opis:
    Poli(3-hydroksymaślan-ko-3-hydroksywalerian) (PHBV) jest polimerem biodegradowalnym należącym do grupy poliestrów alifatycznych. Polimer ten jest termoplastem o wysokim wskaźniku szybkości płynięcia, co utrudnia jego przetwarzanie za pomocą wytłaczania. W przedstawionych badaniach wytworzono mieszankę PHBV z PLGA oraz wyznaczono jej masowy wskaźnik szybkości płynięcia (MFR). Dodatek PLGA obniżył MFR, co umożliwiło wytworzenie trójwymiarowego rusztowania za pomocą techniki szybkiego prototypowania.
    Poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) is a biodegradable polymer which belongs to a group of aliphatic polyesters. PHBV is a thermoplast with a relatively high melt flow index. This property makes it difficult to process by means of extrusion. In the present study we have prepared PHBV blended with PLGA and determined its melt flow rate (MFR). The addition of PLGA decreased MFR, which enabled fabrication of three-dimensional scaffold by means of Fused Deposition Modeling (FDM).
    Źródło:
    Engineering of Biomaterials; 2012, 15, no. 116-117 spec. iss.; 79-81
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena obciążenia cieplnego człowieka w środowisku gorącym poprzez wskaźnik WBGTeff wg zapisów normy PN-EN ISO 7243:2018-01
    Assessment of heat stress in a hot environment using the WBGTeff index in accordance with Standard No. PN-EN ISO 7243:2018-01
    Autorzy:
    Młynarczyk, Magdalena
    Konarska, Maria
    Powiązania:
    https://bibliotekanauki.pl/articles/1845112.pdf
    Data publikacji:
    2021
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    WBGT
    środowisko gorące
    obciążenie cieplne
    nauki o zdrowiu
    inżynieria środowiska
    hot environment
    heat stress
    environmental engineering
    health sciences
    Opis:
    Ocena najwyższego dopuszczalnego obciążenia cieplnego organizmu w środowisku gorącym wyznaczana jest za pomocą wskaźnika WBGT. Nazwa wskaźnika WBGT pochodzi od nazw czujników wykorzystywanych do pomiarów przesiewowych parametrów środowiska: do pomiaru temperatury w stanie wilgotnym (temperatura wilgotnego termometru – Wet Bulb) oraz pomiaru temperatury poczernionej kuli (Globe Temperature). WBGT jako wskaźnik używany do oceny obciążenia cieplnego organizmu do 2017 r. był powiązany z wydatkiem energetycznym i przedstawiony w postaci tabel w polskim wydaniu normy PN-EN 27243:2005 (oraz PN-EN 27243:2005P). W 2017 r. normę zastąpiono dokumentem EN ISO 7243:2017, a w styczniu 2018 r. zostało zatwierdzone polskie tłumaczenie normy PN-EN ISO 7243:2018-01. W artykule zamieszczono opis metodyki prowadzenia badań wskaźnika WBGT zgodnie z zapisami PN-EN ISO 7243:2018-01. Zakres tematyczny artykułu obejmuje zagadnienia zdrowia oraz bezpieczeństwa środowiska pracy będące przedmiotem badań z zakresu nauk o zdrowiu oraz inżynierii środowiska.
    The assessment of maximum allowable heat load of a body in a hot environment is determined using the WBGT index. The name of the WBGT index is derived from the measurement of two parameters: natural wet-bulb temperature and black globe temperature. WBGT as an indicator used to assess the heat load (until 2017) was related to the metabolic heat production and placed in the form of tables in the Polish edition of Standard No. PN-EN 27243:2005 (and PN-EN 27243:2005P). In 2017, this standard was replaced by Standard No. EN ISO 7243:2017, and in January 2018, the Polish translation of Standard No. PN-EN ISO 7243:2018-01 was approved. This article describes the methodology of conducting WBGT research according to Standard No. PN-EN ISO 7243:2018-01. This article discusses the problems of occupational safety and health, which are covered by health sciences and environmental engineering.
    Źródło:
    Podstawy i Metody Oceny Środowiska Pracy; 2021, 1 (107); 5-14
    1231-868X
    Pojawia się w:
    Podstawy i Metody Oceny Środowiska Pracy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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