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    Wyświetlanie 1-14 z 14
    Tytuł:
    MIRRORS AND MONEY: CONSTRUCTING AND DE-CONSTRUCTING REVOLUTION IN MARIANO AZUELA’S LOS DE ABAJO AND JOSEPH CONRAD’S NOSTROMO
    Autorzy:
    Peters, John G.
    Powiązania:
    https://bibliotekanauki.pl/articles/638828.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Opis:
    MIRRORS AND MONEY:CONSTRUCTINGAND DE-CONSTRUCTING REVOLUTIONIN MARIANO AZUELA’S LOS DE ABAJOAND JOSEPH CONRAD’S NOSTROMO
    Źródło:
    Yearbook of Conrad Studies; 2008, 4
    2084-3941
    Pojawia się w:
    Yearbook of Conrad Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MIRRORS AND MONEY: CONSTRUCTING AND DE-CONSTRUCTING REVOLUTION IN MARIANO AZUELA’S LOS DE ABAJO AND JOSEPH CONRAD’S NOSTROMO
    Autorzy:
    Peters, John G.
    Powiązania:
    https://bibliotekanauki.pl/articles/638793.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Opis:
    MIRRORS AND MONEY:CONSTRUCTINGAND DE-CONSTRUCTING REVOLUTIONIN MARIANO AZUELA’S LOS DE ABAJOAND JOSEPH CONRAD’S NOSTROMO
    Źródło:
    Yearbook of Conrad Studies; 2008, 4
    2084-3941
    Pojawia się w:
    Yearbook of Conrad Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    COVID-19 and the food chain? Impacts and future research trends
    COVID-19 a łańcuch dostaw żywności? Zależności i przyszłe trendy badań
    Autorzy:
    Rejeb, Abderahman
    Rejeb, Karim
    Keogh, John G.
    Powiązania:
    https://bibliotekanauki.pl/articles/362156.pdf
    Data publikacji:
    2020
    Wydawca:
    Wyższa Szkoła Logistyki
    Tematy:
    COVID-19
    food supply chain
    food insecurity
    food safety
    consumer behavior
    food waste
    łańcuch dostaw żywności
    bezpieczeństwo dostaw żywności
    bezpieczeństwo żywności
    zachowanie konsumenckie
    marnotrawstwo żywności
    Opis:
    Background: Throughout history, the world has witnessed natural disasters affecting businesses and societies with varying degrees of disruption. COVID-19 (henceforth C19) constituted a significant system shock and a stark reminder of the fragility and sensitive nature of supply chains. The pandemic has exerted considerable societal and economic pressure and has had an adverse impact on food supply chains in particular. Many food processing operations were forced to alter activities or close temporarily due to outbreaks. Societal lockdowns, travel restrictions, business closures and quarantine have led to structural changes in the productivity of economies and impacted the mental health and financial wellbeing of citizens. Methods: We present a critical review of the literature to explore the impact of C19 on the food supply chain. We collected data from journal articles retrieved from a leading scientific database (i.e., Scopus), books, chapters, conference proceedings, reports, and a variety of Internet websites. For the literature search, we used the following words; „COVID-19" and „food". Results and conclusions: The findings of the review suggest that the C19 pandemic poses unprecedented challenges for food supply chains. We reveal that C19 has raised food insecurity and food safety concerns, increased supply chain and logistics costs and radically changed consumer behavior. On the positive side, the pandemic has improved awareness of food waste and the importance of self-grown foods. We generated nine research propositions to foster future academic research. Our study also highlighted the need to advance this literature and calls for increased attention from the supply chain management and logistics community to further analyse and quantify the impact of C19 on the food chain.
    Wstęp: W ujęciu historycznym, świat już nieraz doświadczał naturalnych katastrof, które miały wpływ w różnym nasileniu na biznes oraz społeczeństwo. COVID-19 (C19) spowodował istotny szok dla systemu oraz przypomniał o kruchości i wrażliwości łańcuchów dostaw żywności. Pandemia wywarła istotny wpływ w szczególności na tą część ogólnego łańcucha dostaw. Wiele przedsiębiorstw produkujących żywność musiało zmienił sposób swojej działalności lub czasowo ją przerwać. Lockdown, ograniczenia w podróżowaniu, zamknięcie części działalności gospodarczej i kwarantanna doprowadziły do strukturalnych zmian w produktywności ekonomii i wpłynęły na zarówno psychiczne zdrowie jak i poziom zamożności obywateli. Metody: W pracy zaprezentowany jest krytyczny przegląd literatury dotyczącej wpływu C19 na łańcuch dostaw żywności. Dane zostały zebrane na podstawie przeglądu artykułów prasowych z wiodących baz naukowych (np. Scopus), książek, rozdziałów, materiałów konferencyjnych, raportów oraz różnych stron internetowych. Przy wyszukiwaniu tych prac, słowami kluczowymi były słowa: „COVID-19” oraz „żywność”. Wyniki i wnioski: Uzyskane wyniki badań sugerują, że pandemia C19 jest niespotykanym wyzwaniem dla łańcuchów dostaw żywności. C19 spowodował obniżenie bezpieczeństwa łańcucha dostaw żywności, zwiększył koszty logistyki i radykalnie zmienił upodobania konsumentów. Jak pozytywny efekt, pandemia zwiększyła świadomość marnotrawstwa żywności i istotność niezależności produkcji żywności. Zostały opracowane propozycje dalszych kierunków badańnaukowych w tym obszarze. Pokreślono potrzebę tych badań oraz rozpracowanie wpływu C19 na łańcuch dostaw żywności w kontekście zarządzania łańcuchem dostaw.
    Źródło:
    LogForum; 2020, 16, 4; 475-485
    1734-459X
    Pojawia się w:
    LogForum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bacteriological profile of cut fruits sold in Calabar Metropolis
    Autorzy:
    Edeghor, U.
    John, G. E.
    Origbu, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1076796.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Calabar Metropolis
    Foodborne illness
    Fruits
    Microbial contaminants
    Pathogens
    Opis:
    The increase in cases of food borne illnesses related to street vended fruit salad in developing countries is of serious public health concern. This study was, therefore, conducted on street-vended fruit salad, to determine their microbial quality. A total of twenty (20) fruit samples, comprising five each of fresh Apple (Malus domestica Borkh), Pineapple (Ananas comosus L.), Pawpaw (Carica papaya) and Watermelon (Citrullus lanatus) were collected from 3 different locations (Watt, Marian and Goldie) in Calabar and were evaluated by way of standard plate techniques, for microbial contaminants. The specific microbial genera were enumerated on appropriate selective media and identified using standard identification parameters with the aid of identification and taxonomic manuals. The results revealed that the mean total bacterial counts of all the fruit samples ranged from 1.07 × 103 to 3.4 × 103CFU/g, whereas, the mean total coliform counts ranged from 0.9 × 103 to 2.05 × 103 CFU/g, respectively. The differences in the mean total heterotrophic counts and coliform counts recorded for the fruits collected from the respective food vendors was statistically insignificant (P>0.01). Bacteria isolated include Staphylococcus aureus, Pseudomonas aeruginosa, Salmonella sp, Shigella sp, Proteus mirabilis and Escherichia coli. The presence of coliform bacteria and other microbial contaminants in numbers exceeding the recommended microbiological standards is a reflection of unwholesome product, hence the need for proper microbiological safety analysis of fruit salad prepared for human consumption. Therefore, consumer’s awareness on the dangers of consuming pathogen contaminated foods and the need to insist on properly processed/stored sliced produce, needs to be re-awakened.
    Źródło:
    World News of Natural Sciences; 2019, 23; 43-55
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect on magnetic properties of zinc doped nano ferrites synthesized by precursor or metod
    Autorzy:
    Anjaneyulu, T.
    Murthy, P. N.
    Rafi, Sk. Md.
    Bademiya, Sk.
    John, G. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/412213.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Nanoferrites
    Cu-Zn ferrite
    Precursor Method
    Magnetic properties
    Opis:
    Nanocrystalline Cu-Zn ferrites have been synthesized using precursor method. Cu-Zn ferrites were formed at low temperature without any impurities. The particle sizes were observed to decrease from 60 nm to 50 nm with increasing non-magnetic Zn doping. Cu is used to decrease the sintering temperature. The X-ray diffraction (XRD) and IR analysis of Cu-Zn revealed the formation of Single-Phase Spinel structure at very low annealing temperature. The particle sizes observed from XRD is very well in agreement with SEM analysis. Cu-Zn ferrite nanoparticles were observed to be dependent on the particle size. Saturation (Ms) and Remanence (Mr) magnetization of ferrites increases due to the modifications occurred among the A-B, A-A and B-B interactions of Spinel structure. The Coercive force (Hc) decreases with increase of Zn ions concentration.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 14; 37-43
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wstępna analiza stawu biodrowego człowieka fizjologicznie prawidłowego oraz po zabiegu kapoplastyki
    Preanalysis of human hip joint physiologically correct and after operation of resurfacing
    Autorzy:
    John, A.
    Kokot, G.
    Duda, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/99081.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Śląska. Katedra Biomechatroniki
    Tematy:
    staw biodrowy
    kapoplastyka
    obciążenie
    analiza numeryczna
    hip joint
    resurfacing
    load
    numerical analysis
    Opis:
    W pracy przedstawiono sposób zamodelowania stawu biodrowego człowieka odpowiadający stanowi przed operacją kapoplastyki (fizjologicznie prawidłowemu) oraz stanowi po operacji. W obu modelach założono takie same warunki brzegowe. Następnie przeprowadzono analizę numeryczną oraz porównano wyniki w celu określenia, które miejsca modeli są najbardziej narażone na przeciążenia podczas fizjologicznego obciążenia stawu biodrowego.
    In this work two states of human hip joint were modelled refers to: state physiologically correct and after resurfacing operation. These same boundary conditions were assigned to both models and the FEM analysis was conducted. The obtained results were compared and finally the most dangerous and overloading areas were defined for physiological loading of hip joint.
    Źródło:
    Aktualne Problemy Biomechaniki; 2010, 4; 79-84
    1898-763X
    Pojawia się w:
    Aktualne Problemy Biomechaniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancement of Aerodynamic Efficiency of Aerofoil Using Improved Blowing and Suction System
    Autorzy:
    Balaji, K.
    Wessley, G. Jims John
    Powiązania:
    https://bibliotekanauki.pl/articles/2024000.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    Co flow jet
    Improved blowing and suction system
    aerodynamic efficiency
    stalling angle
    control surfaces
    secondary flow
    Opis:
    Improved Blowing and Suction System (IBSS) is a novel concept that can be effectively implemented in future aircraft to improve the aerodynamic performance of aircraft wings. The proposed IBSS consists of a regular wing without its secondary control surfaces and with a Pump. The injection and suction system is used to create additional flow without disturbing the main flow over the aerofoil which effectively delays the boundary layer separation. The injection and suction areas are kept constant and they are located just below the maximum thickness point and suction is created close to the trailing edge. This paper presents a detailed numerical analysis of the proposed IBSS and the study shows that the stalling angle of attack is increased by 60% while the coefficient of lift is increased 37.5% compared to the baseline aerofoil. Also, the commercially used coflow jet (CFJ) method stalls at a 12° angle of attack whereas with the proposed IBSS method the stall occurs at a 16° angle of attack. The stalling angle is thus delayed by 33%, thus increasing the aerodynamic performance of the wing as compared to the existing methods. Also, any malfunction in IBSS does not significantly affect the performance of the aircraft. The implementation of IBSS will lead to a reduction in the weight of the aircraft and the elimination of secondary control surfaces.
    Źródło:
    Advances in Science and Technology. Research Journal; 2021, 15, 2; 116-126
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bacteriological quality assessment of two sources of water supplies in Mubi, North-eastern Nigeria
    Autorzy:
    Tula, M. Y.
    Onyeje, G. A.
    John, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1162572.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Bacteriological
    Coliform
    Heterotrophic plate count
    Mubi
    water supplies
    Opis:
    Water is essential for all life forms and the provision of safe drinking water to the populace cannot be overemphasized. This study examined the bacteriological quality of two sources of water supplies in Mubi, North-eastern Nigeria. A total of 72 water samples were analysed. These include 30 from 10 brands of sachet water and 42 from 21 boreholes in seven different wards of Mubi. Heterotrophic plate count (HPC) was determined by pour plate technique and the total coliform count was determined by 3-3-3 regimen using most probable number (MPN) technique. Escherichia coli and other isolates were identified by standard protocols. The mean HPC for both borehole and sachet water samples were variable and ranged from 3.3 × 102 – 4.7 × 104 cfu/ml for sachet water and 1.1 – 6.0 × 104 cfu/ml for borehole water samples. The HPC of borehole water samples were significantly higher than those of sachet water (P = 0.006). The results showed that the mean MPN index for sachet water samples from brand HCM, KGN, OYM and YNS were zero (0). Brand UDS had the highest mean MPN index (1966.7), while other brands had low mean MPN index that ranged from 3.0 -9.1. In the same vein, the mean MPN index of borehole water samples were high, variable and ranged from 3.7 – 1750. Statistically, the mean MPN index/100ml of borehole water samples were significantly higher than those of sachet water samples (P = 0.006). A total of 49 non-repetitive bacterial species were isolated from the two sources of water. These include E. coli (30), Enterobacter spp (3), P. aeruginosa (5) and Citrobacter spp (11). The distributions of bacterial isolates from the two sources of water showed that E. coli was detected in two brands of sachet water SDK and DYJ and 20 representative boreholes in all the locations, while other organisms were variably distributed. The presence of these organisms constitutes public health significance.
    Źródło:
    World Scientific News; 2018, 111; 100-110
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of an Online Crime Management & Reporting System
    Autorzy:
    Ganiron Jr, Tomas U.
    Chen, John Stephen
    Dela Cruz, Ronalyn
    Pelacio, Jeromme G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1066218.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Biometric
    crime management
    online
    reporting system
    software quality
    Opis:
    Nowadays, much of the crimes committed were unreported to the authorities. Given this fact, the study presents the development of a Crime Management and Reporting System through online and even offline and at the same time is the active participation of the citizens. The idea draws its motivation from the inconvenience of going to the police station and personal belief of the weak investigative capabilities of the authorities to resolve petty crimes and limited spreading of crime information to the community. The project specifically looks into the crime detection and prevention. This study aims to provide an overview of the investigative process and, in doing so, identify effective and efficient approaches to the investigation and detection of the volume of crimes. The review is particularly aimed to highlight the research evidence those investigative practices and actions that are likely to lead to a positive outcome. The development of software includes the process of brainstorming and planning, requirements analysis, system analysis and designs, implementation and testing, deployment, and maintenance. The criteria of evaluation of software quality were adapted in ISO/IEC 25010:20011. This also shows that distance is also a factor that influences greatly how crimes are being handled with many crimes going unreported as a result. Crime Management and Reporting System would really help the complainant and the authority to communicate privately and easily with regards to the reported issue. In addition, it would be easier for the complainant to report a witnessed crime without the fear of getting involved in the problems because of the security that the only authorized user can see the report. Based on the findings, the researchers recommend the following for further study: widening the limit of the system by considering other cities; a generic platform for keeping human records from birth till death, deploying this sort of platform will serve as a source of information on persons from various states within the country and even those outside. Verification using Biometric is highly recommended to enhance the security of data stored in the system. This increases the restriction on access to the system, thus unauthorized users have no access to the system. Face recognition technology can be added.
    Źródło:
    World Scientific News; 2019, 131; 164-180
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Footprints of the earliest reptiles : Notalacerta missouriensis : Ichnotaxonomy, potential trackmakers, biostratigraphy, palaeobiogeography and palaeoecology
    Autorzy:
    Marchetti, Lorenzo
    Voigt, Sebastian
    Lucas, Spencer G.
    Stimson, Matthew R.
    King, Olivia A.
    Calder, John H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1836266.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Carboniferous
    Permian
    eptile tracks
    Notalacerta
    ichnotaxonomy
    trackmaker
    Opis:
    The origin of reptiles in the tetrapod footprint record has always been a debated topic, despite the great potential of fossiliferous ichnosites to shed much light on reptile origins when compared to the much less extensive skeletal record. This is in part due to an unclear ichnotaxonomy of the earliest tracks attributed to reptiles that has resulted in unreliable trackmaker attributions. We comprehensively revise the earliest supposed reptile ichnotaxon, Notalacerta missouriensis, based on a neotype and a selection of well-preserved material from the type locality and other sites. A synapomorphy-based track-trackmaker attribution suggests eureptiles and, more specifically, ́protorothyridids ́ such as Paleothyris as the most probable trackmakers. A revision of the entire Pennsylvanian-Cisuralian record of this ichnotaxon unveils an unexpected abundance and a wide palaeogeographical distribution. The earliest unequivocal occurrence of Notalacerta is in the middle Bashkirian (early Langsettian) at the UNESCO World Heritage Site, Joggins Fossil Cliffs (Joggins, Nova Scotia, Canada). This occurrence also coincides with the earliest occurrence of reptile body fossils (Hylonomus lyelli), which are found at the same site. Notalacerta is abundant and widely distributed during the Bashkirian, mostly in sediments deposited in tidal palaeoenvironments, and less common in the Moscovian and Kasimovian. During the Gzhelian and Asselian, Notalacerta occurrences are unknown, but it occurs again during the Sakmarian and is widespread but not abundant during the Artinskian, mostly in fully continental palaeoenvironments.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2020, 90, 3; 271-290
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Insect antifeedant potent halogen substituted phenyl chalcones
    Autorzy:
    Sundararajan, R.
    Arulkumaran, R.
    Vijayakumar, S.
    Kamalakkannan, D.
    Suresh, R.
    John, J. S.
    Ranganathan, K.
    Sakthinathan, S. P
    Vanangamudi, G.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412081.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Substituted styryl 2′,3′,4′-trichlorophenyl ketones
    sulfated Titania
    IR and NMR spectra
    Insect antifeedant activities
    Opis:
    Some 2′,3′,4′-trichlorophenyl chalcones [(E)-1-(2,3,4-trichlorophenyl)-3-(substituted phenyl)-2-propen-1-ones] have been synthesised using sulfated Titania catalyzed solvent-free aldol condensation between 2,3,4-trichloroacetophenone and substituted benzaldehydes. The purities of synthesised chalcones were checked by their analytical, physical and spectroscopic data reported in literature. The insect antifeedant activities of these chalcones have been studied using 4th instar larvae Achoea Janata L by castor leaf disc bio-assay method. The chloro substituted chalcones shows significant insect antifeedant activity.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 1; 67-73
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prevalence of skeletal fluorosis in fishermen from Kutch coast, Gujarat, India
    Autorzy:
    John, J.
    Hariharan, M.
    Remy, V.
    Haleem, S.
    Thajuraj, P.K.
    Deepak, B.
    Rajeev, K.G.
    Divakar, D.D.
    Powiązania:
    https://bibliotekanauki.pl/articles/871373.pdf
    Data publikacji:
    2015
    Wydawca:
    Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
    Tematy:
    fishing industry
    prevalence
    skeletal fluorosis
    bone disease
    human disease
    fisherman
    Kutch coast
    Gujarat
    India
    Opis:
    Background. In health terms, consuming fluoride is well recognised to be a double-edged sword. Consumption of optimal amounts is beneficial to health, however an excess constitutes a health hazard. Objectives. To assess the prevalence of skeletal fluorosis in fishermen from the Kutch coast, Gujarat, India. Materials and method. A descriptive cross-sectional survey was conducted on 653 fishermen from the Kutch District, Gujarat, India, from October 2014 to December 2014. Clinical skeletal fluorosis was assessed using three diagnostic tests. Drinking water fluoride concentrations in different regions of the study area were determined. General information regarding age, gender and adverse habits were also collected. The Chi square test was used for comparisons and the confidence level and critical p-value were set at 95% and 5% respectively. Results. Fluoride concentrations in water from the study area ranged between 3.4- 6.9 ppm. The prevalence of skeletal fluorosis was 30.3%, out of which, the majority of the subjects had mild skeletal fluorosis (18.4%). This condition was found to be significantly associated with age and gender along with tobacco and alcohol consumption; depending on the habit’s duration. Conclusion. Being a public health problem in the fishermen community, skeletal fluorosis requires a-priori attention. Measures for preventing this disease should be undertaken on a communitywide basis.
    Źródło:
    Roczniki Państwowego Zakładu Higieny; 2015, 66, 4
    0035-7715
    Pojawia się w:
    Roczniki Państwowego Zakładu Higieny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrosion behavior of ZrC particles reinforcement with Al-12Si composites by weight loss method using acidic media
    Autorzy:
    John, C. F.
    Paul, R. C.
    Singh, S. C. E.
    Jacobjose, J.
    Ramkumar, T.
    Hikku, G. S.
    Sharma, R. K.
    Sengottuvel, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/200059.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Si-ZrC composites
    powder metallurgy
    weight loss method
    corrosion rate
    SEM
    kompozyty Al-Si-ZrC
    metalurgia proszków
    metoda redukcji masy
    szybkość korozji
    Opis:
    This paper aims to investigate the corrosion behavior of zirconium carbide (ZrC) reinforced Al – Si metal matrix composites (MMCs) in a mixture of acidic solution using weight loss method. The composites are prepared by powder metallurgy method. Al-12Si-xZrC composites containing 0, 5, and 10 weight percentage of ZrC particles are compacted in a die set assembly and sintered in an inert gas muffle furnace. The acidic solutions used for corrosion are 1 N HCl, 1 N H2SO4 and 1 N HNO3. The corrosion characteristics of Al-12Si-xZrC composites and the pure Al were experimentally evaluated. The corrosion test was carried out at different weight proportions of the samples in various concentrations of the acid such as 1 N HCl, 1 N H2SO4 and 1 N HNO3 for different exposure time (i.e., 24 h, 72 h, 144 h and 216 h), respectively. The results specified that corrosion rate of composites was lower than that of base metal Al under the corrosive atmosphere, regardless of exposure time and acidic solutions used as corrodents. Al-12Si-xZrC composites become more corrosion resistant as the ZrC content is increased. This is because of the development of stable oxide layer above the specimens. Scanning electron microscopy (SEM) confirms the degree of attack of acidic solution on the surface of the examined material.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 1; 9-16
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PROBLEMS
    Autorzy:
    Chrobak, M.
    Habib, M.
    John, P.
    Sachs, H.
    Zernitz, H.
    Reay, J. R.
    Sierksma, G.
    Sysło, M. M.
    Traczyk, T.
    Wessel, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/742877.pdf
    Data publikacji:
    1987
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Opis:
    1. Walls of rectangles (M. Chrobak) 2. Plane embeddings (M. Chrobak) 3. Cubic Hamiltonian graphs (M. Chrobak) 4. Jump number problem - 1 (M. Habib) 5. Domino covers in square chessboards (P. John, H. Sachs and H. Zernitz) 6. Interiors of uniform size in Steinitz's Theorem (J. R. Reay) 7. Area of lattice polygons - the $ 10 problem (J. R. Reay) 8. Regular graphs (G. Sierksma) 9. Jump number problem - 2 (M. M. Sysło) 10. Hamiltonian cycles in G² (T. Traczyk) 11. Thickness of graphs (W. Wessel)
    Źródło:
    Applicationes Mathematicae; 1987, 19, 3-4; 635-641
    1233-7234
    Pojawia się w:
    Applicationes Mathematicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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