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Tytuł:
Characterization of chemical processes involved in ozone depletion
Autorzy:
Asira, E. E.
Powiązania:
https://bibliotekanauki.pl/articles/412341.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Atmosphere
ozone
depletion
processes and effects
Opis:
The earth’s carrying capacity to support human life has been overstretched by increasing need to meet food requirements, consumption of resources; amount of waste generation and choice of technologies. These activities release into the atmosphere, chemical constituents of varied concentrations. When these chemicals enter into the atmosphere, they are subjected to various transformations that yield products or intermediates that tend to alter atmospheric chemical balance. In recent years, the global problem of ozone depletion has underscored the danger of overstepping earth’s ability to absorb waste products. This study therefore, focuses on the various chemical reactions involved in ozone depletion and the effects of ozone layer depletion on plant, animals, materials and climate.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 2; 53-57
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ego Depletion Sensitivity as the Mediator Between Avoidance Temperaments and Subjective Vitality
Autorzy:
Adil, Adnan
Kanwal, Asmara
Yasin, Ghulam
Ameer, Sadaf
Powiązania:
https://bibliotekanauki.pl/articles/2129975.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ego depletion sensitivity
temperament
subjective vitality
Opis:
The present study examined the mediating role of ego depletion sensitivity between temperaments and subjective vitality. The sample of the present research consisted of 210 undergraduate students of the University of Sargodha. Temperament, ego depletion sensitivity, and subjective vitality were operationalized through Approach-Avoidance Temperament Questionnaire (Elliot & Thrash, 2010), Depletion Sensitivity Scale (Salmon et al., 2014), and Subjective Vitality Scale (Ryan & Frederick, 1997), respectively. Correlation analysis depicted that ego depletion sensitivity was positively correlated with avoidance temperament and negatively correlated with subjective vitality. Furthermore, ego depletion sensitivity mediated between avoidance temperament and subjective vitality. Implications of the study along with its limitations and suggestions were discussed.
Źródło:
Polish Psychological Bulletin; 2021, 52, 2; 188-196
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Using New Technology Vehicles on the World’s Environment and Petroleum Resources
Autorzy:
Al Rashdan, Maen
Al Zubi, Mohammad
Al Okour, Mohamad
Powiązania:
https://bibliotekanauki.pl/articles/125137.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
clean energy vehicle
emissions
conversion chain
depletion time
Opis:
Nowadays, the trend towards the use of transportation technologies which are clean and less dependent on fossil fuel is highly increased. That is because of the fast depletion of oil reserves in the world. On the other hand, the growth of developing nations into industrialized ones will increase the demand on the energy sector, a large part of which is transportation. This development of the transportation sector will affect the environment as a result of greenhouse gases. In this paper, the use of several types of clean energy vehicles is demonstrated, compared with the ones utilizing classic internal combustion engine, with statistical demonstration and the energy conversion chain. The impact of hybrid vehicles on the petroleum reserves and consumption rates will also be discussed using some mathematical equations.
Źródło:
Journal of Ecological Engineering; 2019, 20, 1; 16-24
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fatigue and the Intensity of Behavioral Restraint – Considering Significance for Health and Self-Control
Autorzy:
Wright, Rex A.
Mlynski, Christopher
Carbajal, Ivan
Powiązania:
https://bibliotekanauki.pl/articles/2126860.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Fatigue
Resource Depletion
Self-Control
Restraint
Cardiovascular Response
Opis:
We describe an emerging analysis of fatigue influence on behavioral restraint and consider its potential significance for two central concerns of contemporary restraint investigators: (1) adverse health effects of restraint, and (2) fatigue influence on self-control. Regarding health, the analysis provides a conceptual framework for anticipating restraint intensity and therefore possible risk. It also draws attention to a pathological pathway through which restraint could generate some adverse health outcomes. Regarding self-control, the analysis conveys a perspective that could markedly improve our prediction of relevant outcomes and has focused significance for crises that have been identified in relation to the influential limited resource analysis of self-control developed by Baumeister and colleagues. Crisis concerns have led some to conclude that the limited resource analysis should be discarded. The present behavioral restraint analysis goes against this grain, suggesting that the limited resource analysis might wisely be retained and afforded the chance to mature – among other things, incorporating elaborated effort components.
Źródło:
Polish Psychological Bulletin; 2018, 49, 1; 86-94
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nuclear and mitochondrial genome responses in HeLa cells treated with inhibitors of mitochondrial DNA expression
Autorzy:
Piechota, Janusz
Szczęsny, Roman
Wolanin, Kamila
Chlebowski, Aleksander
Bartnik, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/1041204.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
thiamphenicol
mtDNA depletion
HeLa
dideoxycytidine
mitochondrial biogenesis
ethidium bromide
Opis:
The influence of mutations in the mitochondrial DNA (mtDNA) on the bioenergetic metabolism of the cell is still poorly understood. Many of the mutations in the mtDNA affect the expression of the mitochondrial genome. Investigations on cells from patients are not easy, especially as the mitochondrial DNA is heteroplasmic and this state is changed in culture. Moreover, the nuclear background and the mitochondrial haplotype may affect the behaviour of cells. Transfer of patient mitochondria to rho zero cell lines is also not optimal as these cells in general have many nuclear changes which may also affect cell behaviour. Thus, we decided to use inhibitors of mitochondrial genome expression, such as thiamphenicol, ethidium bromide and dideoxycytidine to investigate the bioenergetic metabolism of HeLa cells. We found that oxidative phosphorylation and glycolysis participate equally in ATP production in HeLa cells and that decreased activity of the respiratory chain leads to increased glycolysis and the reduction of cell growth. Insufficient ATP production in the oxidative phosphorylation process was not compensated by increased proliferation of the mitochondria. However, we were able to show that there are some mechanisms compensating limited expression of the mitochondrial genome within the mitochondria. Experiments with dideoxycytidine revealed that 10-fold decrease of the mtDNA copy number resulted in almost normal activity of cytochrome c oxidase. We found that mtDNA depletion is compensated mostly on the level of RNA metabolism in the mitochondria. Thus, our results are in agreement with the hypothesis that transcription initiation rather than mtDNA copy number is a rate limiting factor for expression of the mitochondrial genome.
Źródło:
Acta Biochimica Polonica; 2006, 53, 3; 485-495
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Glucosylceramide synthase inhibitors D-PDMP and D-EtDO-P4 decrease the GM3 ganglioside level, differ in their effects on insulin receptor autophosphorylation but increase Akt1 kinase phosphorylation in human hepatoma HepG2 cells
Autorzy:
Fedoryszak-Kuśka, Natalia
Panasiewicz, Mirosława
Domek, Hanna
Pacuszka, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/1038804.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Akt1
GM3 ganglioside
glycosphingolipid depletion
insulin receptor
Opis:
Gangliosides function as modulators of several cell growth related receptors. It was shown for caveolin-rich adipocytes, that GM3 ganglioside binds to insulin receptor (IR), dissociates its complex with caveolin, and thus lowers IR autophosphorylation following insulin treatment. We extended those studies into human hepatocyte-derived HepG2 cells, characterized by a high level of IR but low of caveolin. To lower the glycosphingolipid content, estimated by GM3 concentration, two glucosylceramide synthase inhibitors d-threo-1-pheny-2-decanoylamino-3-morpholino-1-propanol (d-PDMP) and d-threo-1-(3,4,-ethylenedioxy)phenyl-2-palmitoylamino-3-pyrrolidino-1-propanol (d-EtDO-P4) were used. d-PDMP at 40 µM or d-EtDO-P4 at 1 µM concentrations in culture medium decreased the GM3 content to 22.3% (17.8-26.1%) and 18.1% (13.7-24.4%), respectively, of the control value. The reduction of GM3 obtained with d-PDMP was accompanied by a 185.1% (153.5-423.8%) significant increase in the level of IR autophosphorylation following cell stimulation with 100 nM insulin. The effect of d-EtDO-P4 on IR autophosphorylation was smaller amounting to an increase by 134.8% (111.3-167.8%) of the control level and statistically non-significant. The effects of d-PDMP and d-EtDO-P4 could also be detected at the level of Akt1 kinase. In cells grown in the presence of d-PDMP the level of phosphorylated Akt1 was 286.0% (151.4%-621.1%) of that in the control. In this case the effect of d-EtDO-P4 was similar: 223.0% (181.4-315.4%) significant increase in phosphorylated Akt1. We assume that glycosphingolipid depletion in HepG2 cells may affect not only IR autophosphorylation but also, independently, the phosphorylation of Akt1, by modifying the membrane microenvironment of this kinase.
Źródło:
Acta Biochimica Polonica; 2016, 63, 2; 247-251
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Full exploitation of groundwater and its economical-social backlashes
Autorzy:
Labbaf Khaneiki, M.
Nouhpisheh, A.
Powiązania:
https://bibliotekanauki.pl/articles/1185802.pdf
Data publikacji:
2005
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
groundwater
depletion of aquifer
qanat
pump extraction
water well
Opis:
Pięćdziesiąt lat temu qanaty (łagodnie nachylone podziemne kanały) dostarczały w Iranie około 18 mld m3 wody podziemnej rocznie, tzn. dwa razy więcej, niż obecnie. Spadek wydajności qanatów jest wiązany z intensywnym pompowaniem wód podziemnych z wielu odwierconych w ostatnich dekadach studni. Podczas całej swojej historii Irańczycy nie spotkali się z takim problemem, gdy wykorzystywali tylko qanaty. Tymczasem qanaty będą jeden po drugim wysychały, ponieważ pompujące wodę studnie wiercone obniżają zwierciadło wód podziemnych poniżej zasięgu qanatów. Eksploatacja wód podziemnych metodą pompowania nie odpowiada środowiskowym warunkom Iranu, bowiem powoduje ona stopniowy wzrost zasolenia zarówno wód podziemnych, jak i gleb, zużywając przy tym wiele energii. Tymczasem qanaty dostarczają wodę całkowicie bez wykorzystywania jakiejkolwiek energii. Pompy głębinowe zagrażają zatem wodom podziemnym Iranu prowadząc do kryzysu społeczno-ekonomicznego. Irańskie władze muszą znaleźć lokalny, zrównoważony sposób zaopatrzenia w wodę. W przeciwnym wypadku rosnąca liczba pomp głębinowych może doprowadzić do zniszczenia zasobów wód podziemnych, a w rezultacie do upadku irańskiego rolnictwa.
Źródło:
Polish Geological Institute Special Papers; 2005, 18; 45-48
1507-9791
Pojawia się w:
Polish Geological Institute Special Papers
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New environmentally friendly low-pressure refrigerants mini-channel
Autorzy:
Sikora, Malgorzata
Bohdal, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/2204072.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
refrigerants
global warming potential
ozone depletion potential
fluorinert liquid
hydrofluoroether
Opis:
Nowadays, in addition to the thermodynamic properties of refrigerants, their impact on the environment is of high significance. Hence, it is important to use refrigerants with the lowest possible values of ozone depletion potential and global warming potential indices in refrigeration, organic Rankine cycle (ORC), air conditioning, and heat pump systems. Natural refrigerants are the most environmentally friendly; unfortunately, they have less favourable thermodynamic properties. Currently, low-pressure refrigerants from the FC (fluorocarbons, fluorine liquids) and HFE (hydrofluoroether) groups are increasingly used. This paper presents the most important properties and applications of selected refrigerants from these groups and also reviews the literature on their use.
Źródło:
Archives of Thermodynamics; 2023, 44, 1; 89--104
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fatty acid and phospholipid chlorohydrins cause cell stress and endothelial adhesion
Autorzy:
Dever, Gary
Wainwright, Cherry
Kennedy, Simon
Spickett, Corinne
Powiązania:
https://bibliotekanauki.pl/articles/1041170.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
atherosclerosis
chlorinated fatty acids
ATP depletion
chlorinated phospholipids
leukocyte adhesion
Opis:
The oxidation of low-density lipoprotein (LDL) is thought to contribute to atherogenesis, which is an inflammatory disease involving activation of phagocytic cells. Myeloperoxidase, an enzyme which is able to produce hypochlorous acid (HOCl), is released from these phagocytic cells, and has been found in an active form in atherosclerotic plaques. HOCl can oxidize both the lipid and protein moiety of LDL, and HOCl-modified LDL has been found to be pro-inflammatory, although it is not known which component is responsible for this effect. As HOCl can oxidize lipids to give chlorohydrins, we hypothesized that phospholipid chlorohydrins might have toxic and pro-inflammatory effects. We have formed chlorohydrins from fatty acids (oleic, linoleic and arachidonic acids) and from phospholipids (stearoyl-oleoyl phosphatidylcholine, stearoyl-linoleoyl phosphatidylcholine and stearoyl-arachidonoyl phosphatidylcholine), and investigated various biological effects of these oxidation products. Fatty acid and phospholipid chlorohydrins were found to deplete ATP levels in U937 cells in a concentration-dependent manner, with significant effects observed at concentrations of 25 µM and above. Low concentrations (25 µM) of stearoyl-oleoyl phosphatidylcholine and stearoyl-arachidonoyl phosphatidylcholine chlorohydrins were also found to increase caspase-3 activity. Finally, stearoyl-oleoyl phosphatidylcholine chlorohydrin increased leukocyte adhesion to artery segments isolated from C57Bl/6 mice. These results demonstrate potentially harmful effects of lipid chlorohydrins, and suggest that they may contribute to some of the pro-inflammatory effects that HOCl-modified low density lipoprotein has been found to induce.
Źródło:
Acta Biochimica Polonica; 2006, 53, 4; 761-768
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Depletion Efficiency of Selected Expired Food Products in the Process of Methane Fermentation
Autorzy:
Kazimierowicz, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/123864.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
expired food products
neutralising organic waste
mesophilic fermentation
thermophilic fermentation
depletion efficiency
Opis:
In retail chains, 1% to 3% of food production, i.e. thousands of tons every year, is perished or expired. Improper waste management poses a threat for human health and pollutes the environment. This waste may be successfully neutralised in the process of methane fermentation. The conducted research was to determine the depletion efficiency of selected expired food products, depending on the composition of the mix, as well as the manner of conducting fermentation and, therefore, duration time and the process temperature.
Źródło:
Journal of Ecological Engineering; 2019, 20, 1; 132-137
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Depletion analysis of the HELIOS experiment using the MCB code
Autorzy:
Oettingen, M.
D'Agata, E.
Döderlein, C.
Tuček, K.
Cetnar, J.
Powiązania:
https://bibliotekanauki.pl/articles/146842.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
depletion
HELIOS
Monte Carlo continuous energy burn-up code (MCB)
minor actinides
Opis:
The focus of our studies is to present an advanced depletion analysis of the HELIOS experiment by means of the Monte Carlo continuous energy burn-up code (MCB). The MCB was used mainly to calculate nuclide density evolution in nuclear reactor cores. We present the capability of the MCB to investigate the depletion of nuclear fuel samples irradiated in the HELIOS experiment. In our studies we traced the behaviour of the main fissile isotopes, 242mAm and 239Pu, respectively. We also perform a sensitivity analysis to the choice of JEF2.2 and JEFF3.1 cross section libraries in terms of the released fission power and the evolution of actinide inventories. The amount of He produced at the end of irradiation, as well as Am and Pu depletion, were also considered.
Źródło:
Nukleonika; 2012, 57, 4; 435-441
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Abiotic depletion in energy and waste management systems
Wyczerpywanie surowców mineralnych w systemach energetycznych i gospodarki odpadami
Autorzy:
Pikoń, K.
Powiązania:
https://bibliotekanauki.pl/articles/282310.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
wyczerpywanie surowców mineralnych
LCA
gospodarka odpadami
energia
abiotic depletion
LCA waste management
energy
Opis:
Abiotic resources are defined as natural sources (including energy sources), such as iron ore and crude oil, which are regarded as "non living". Abiotic depletion is one of the impact categories to be taken into account in Life Cycle Assessment. It is also one of the most frequently discussed impact categories. Energy generation is usually linked with the consumption of natural resources. Abiotic depletion is strongly dependent on used forms of electricity generation. On the other hand, waste management systems could be treated as a source of "negative emission", as well as a significant means of conserving natural resources. Combining both systems in abiotic depletion terms would be interesting. The LCA analysis presented in the paper focuses on natural resource usage calculated for power systems in different countries of the EU, and compared with possible conservation of natural resources linked with different recycling options. The paper also discusses the influence of waste management systems on mineral resource management, and the promotion of different types of waste recycling and other forms of waste utilization on a national scale.
Zasoby naturalne są zwykle utożsamiane ze źródłami energii oraz surowców, takich jak ruda żelaza czy ropa naftowa. Zubażanie surowców mineralnych jest jedną z kategorii wpływu w analizach LCA, która zawsze pojawia się we współczesnych analizach środowiskowych. Jest to również jedna z najczęściej dyskutowanych kategorii. Wytwarzanie energii jest zwykle związane z konsumpcją zasobów naturalnych na dużą skalę. Jej skala jest bardzo silenie uzależniona od technologii wytwarzania energii. Z drugiej strony znajduje się system gospodarki odpadami, który może stać się źródłem poważnych oszczędności jeśli chodzi o konsumpcję surowców naturalnych. Połączenie obu systemów w kategoriach konsumpcji zasobów naturalnych może przynieść ciekawe rezultaty. W pracy zostały przedstawione analizy LCA ukierunkowane na kategorie wpływu "zubożenie zasobów mineralnych" w systemach energetycznych różnych krajów Unii Europejskiej. Przestawione zostały porównania i nakreślony związek pomiędzy systemem energetycznym i systemem gospodarki odpadami. Przestawiony został również potencjalny wpływ na gospodarkę surowcami mineralnymi oraz rola jaką może odegrać promocja poszczególnych metod zagospodarowania odpadów w skali ogólnopolskiej.
Źródło:
Polityka Energetyczna; 2012, 15, 1; 87-101
1429-6675
Pojawia się w:
Polityka Energetyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie odwiertów multilateralnych na złożach ropy naftowej w późnej fazie eksploatacji
Application of multilateral wells in oil fields at the late phase of exploitation
Autorzy:
Stopa, J.
Rychlicki, S.
Wojnarowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/299955.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
odwiert multilateralny
eksploatacja ropy
wskaźnik sczerpania złoża
multilateral well
oil exploitation
depletion index
Opis:
Systemy multilateralne w porównaniu z konwencjonalnymi odwiertami oferują szereg korzyści takich jak: możliwość zwiększenia zasobów poprzez udostępnienie partii złoża nie objętych dotychczasową eksploatacją, przyspieszenie wydobycia, zmniejszenie kosztów ponoszonych w trakcie realizacji projektu wydobywczego dzięki wykorzystaniu wspólnego odcinka pionowego dla wielu gałęzi poziomych lub nachylonych. Obecnie, dzięki wysokiej cenie ropy naftowej, odwierty tego typu mogą stanowić atrakcyjną alternatywę udostępnienia złóż na każdym etapie eksploatacji. W pracy przeprowadzono ocenę efektywności technicznej zastosowania odwiertu multilateralnego na przykładowym, częściowo sczerpanym złożu ropy naftowej w Polsce. Z wykorzystaniem symulacji komputerowej wykonano analizę porównawczą między odwiertem pionowym, horyzontalnym oraz multilateralnym, a także oszacowano wydajności takich otworów. Według wyników symulacji, zastosowanie odwiertu multilateralnego wpłynęło na znaczące zwiększenie wydobycia ze złoża oraz jego równomierne sczerpanie dzięki objęciu eksploatacją dużej części złoża.
Multilateral systems as compared with the conventional wells offer a number of advantages, e.g. possibility of increasing resources through opening a part of the unproduced reservoir, acceleration of production, lowering the cost of realization of exploitation project owing to the use of a common vertical section for a number of horizontal or inclined branches. Thanks to the high oil price, now this type of wells is an attractive alternative of opening deposits at any stage of exploitation. The technical efficiency of a multilateral well was assessed on the example of a partly depleted oil field in Poland. Using computer simulation methods, a comparative analysis of vertical, horizontal and multilateral wells was carried. Moreover, the efficiency of these wells was evaluated. According to the simulation results, the use of a multilateral well significantly increased the production and uniform depletion. This was due to the fact that a large part of the field was being exploited.
Źródło:
Wiertnictwo, Nafta, Gaz; 2007, 24, 1; 495-501
1507-0042
Pojawia się w:
Wiertnictwo, Nafta, Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculation of boil-off gas (BOG) generation OF KC-1 membrane LNG tank with high density rigid polyurethane foam by numerical analysis
Autorzy:
Jeong, H.
Shim, W. J.
Powiązania:
https://bibliotekanauki.pl/articles/258466.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
boil-off gas
KC-1 membrane
LNG carrier
rigid polyurethane foam
ozone depletion potential
Opis:
Recently, a new type of LNG tank named “KC-1 membrane LNG tank” has been developed by Korean Gas Corporation (KOGAS), and Samsung Heavy Industries (SHI) is currently building KC-1 membrane type LNG carriers. Unlike other LNG tanks, the KC-1 membrane LNG tank has a single-insulation structure rather than a double-insulation structure. For a given tank’s boundary condition, heat transfer analysis is performed from the external to the internal environment of the LNG tank by numerical simulation for three tanks. In each tank, the main thermally resistant layer of insulation is assembled with a High density rigid Polyurethane Foam (H-PUF), which is blown with one of three different types of hydrofluorocarbons—namely—HFC-365mfc, 245fa, and 245fa-e (enhanced). Advantage of such blowing agents is that it has a lower Ozone Depletion Potential (ODP) than HCFC-141b or carbon dioxide ( ) that has been used in the past as well as having low thermal conductivity. A Reduced Order Model is utilized to a 3-dimensional section of the insulation to calculate equivalent thermal conductivity. The equivalent thermal conductivity of the insulation is then applied to the rest of LNG tank, reducing the size of tank simulation domain as well as computation time. Tank’s two external and internal boundary conditions used are those defined by the International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC) and the United States Coast Guard (USCG) conditions. Boil-off Rate (BOR) of the tank that has the insulation with H-PUF blown with HFC-245fa resulted in 0.0927 %/day and 0.0745 %/day for IGC and USCG conditions, respectively.
Źródło:
Polish Maritime Research; 2017, 1; 100-114
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected problems of transport in port towns – tri-city as an example
Autorzy:
Budzyński, M.
Ryś, D.
Kustra, W.
Powiązania:
https://bibliotekanauki.pl/articles/259982.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
boil-off gas
KC-1 membrane
LNG carrier
rigid polyurethane foam
ozone depletion potential
Opis:
Port towns are strategic places from the point of view of transport systems. They form integration junctions for various transport branches , apart from the traditional - road and railway ones , also for water( sea) transport which is active there. Moreover, air transport comes also into consideration , whose efficient functioning must be connected with good accessibility, that concerns sea transport as well. Efficient and safe servicing the ports is crucial for their functioning. Problems associated with the overloading of lorries, which leads to degradation of road surface structure , observed in Gdynia, are discussed as an example in this paper. Problems of road traffic safety (RTS) are presented in this paper on the example of Gdańsk. The two issues : the road traffic safety and road surface degradation constitute only some transport problems of port towns , but they are very important, from the point of view of their specificity, for integration junctions of all the transport branches for people and goods. However, in discussing selected aspects of transport in port towns it is necessary to refer to the managing of integrated transport system with taking into account its traffic safety aspects.
Źródło:
Polish Maritime Research; 2017, S 1; 16-24
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 27

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