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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:
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
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:
Żelazny Marszałek : biografia Ludwika M. Davouta
Autorzy:
Gallaher, John G.
Współwytwórcy:
Sawaryn, Tomasz. Recenzja
Chrzanowski, W. Tłumaczenie
Data publikacji:
2000
Wydawca:
Warszawa
Tematy:
Davout, Louis N.
Davout Louis N. (1770-1823) biografia recenzja
Marszałkowie biografie Francja 19 w. recenzja
Opis:
Marszałek Francji. Gubernator i dca wojsk francuskich i polskich w Księstwie Warszawskim.
Dostawca treści:
Bibliografia CBW
Książka
Tytuł:
Żelazny marszałek : biografia Ludwika M. Davouta
Autorzy:
Gallaher, John G.
Współwytwórcy:
Czubaty, Jarosław. Recenzja
Chrzanowski, Wojciech. Tłumaczenie
Data publikacji:
2000
Wydawca:
Gdańsk
Tematy:
Davout, Louis N.
Davout Louis N. (1770-1823) biografia recenzja
Marszałkowie biografie Francja 19 w. recenzja
Opis:
Marszałek Francji. Gubernator i dca wojsk francuskich i polskich w Księstwie Warszawskim.
Dostawca treści:
Bibliografia CBW
Książka
Tytuł:
Żelazny Marszałek : biografia Ludwika M. Davouta
Autorzy:
Gallaher, John G.
Współwytwórcy:
Chrzanowski, Wojciech. Tłumaczenie
Szymański, Andrzej Krzysztof. Recenzja
Data publikacji:
2000
Wydawca:
Gdańsk : "Finna"
Tematy:
Davout, Louis N.
Davout Louis N. (1770-1823) biografia recenzja
Wojny 1803-1815 r. napoleońskie dowódcy biografie recenzja
Marszałkowie biografie Francja 18-19 w. recenzja
Opis:
Gubernator i dca wojsk francuskich i polskich stacjonujących w Księstwie Warszawskim (1807-1812).
Oryg.: "The Iron Marshall a biography of Louis N. Davout".
Dostawca treści:
Bibliografia CBW
Książka
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:
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:
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:
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
Wyświetlanie 1-15 z 30

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