Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "John, G." wg kryterium: Autor

  Lista filtrów

Dostawca treści

Podbaza

Wyrównaj
Wyświetlanie 1-15 z 30
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:
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:
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:
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:
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:
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:
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:
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
Wyświetlanie 1-15 z 30

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies