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Tytuł:
Properties of the Surface Alloyed AISI 1020 Steel with $Fe_{(15-x)}Mo_{x}B_5$ Alloy
Autorzy:
Abakay, E.
Sen, S.
Sen, U.
Powiązania:
https://bibliotekanauki.pl/articles/1292852.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.77.Fv
81.40.Cd
81.40.Ef
81.05.Je
81.40.-z
Opis:
It is now well established that considerable improvement in the mechanical/chemical properties of near surface regions of materials can be achieved by the process of surface alloying. In the present study, surface alloying treatment with molybdenum and boron on the surface of the AISI 1020 steel was realized by the technique of tungsten inert gas welding. Ferrous boron alloy and ferrous molybdenum were used for surface alloying treatment. Before the treatment, ferrous alloys were grinded and sieved to be smaller than 45 μm. Prepared powder was pressed on the steel substrate and melted by tungsten inert gas welding for surface alloying. Coated layers formed on the steel substrate were investigated using optical and scanning electron microscopy, X-ray diffraction analysis and Vickers microhardness testers. It was shown that surface alloyed layer has composite structure including steel matrix and well distributed boride phases. Borides formed in the coated layers have a small precipitated structure and distributed in the grain boundaries as continuous phases. X-ray diffraction analyses show that coated layers include $Fe_2B$, $Fe_{13}Mo_2B_5$, $Mo_2FeB_4$, and iron.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 584-586
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wear Properties of the Surface Alloyed AISI 1020 Steel with $Fe_{(15-x)}Mo_{x}B_5$ by TIG Welding Technique
Autorzy:
Abakay, E.
Sen, S.
Sen, U.
Powiązania:
https://bibliotekanauki.pl/articles/1292921.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Cd
81.40.Ef
52.77.Fv
81.05.Je
81.40.Pq
Opis:
Surface alloying caused the improvement in the mechanical/chemical properties of near surface regions of the steels. In the present study, surface alloying treatment with boron, molybdenum, and iron on the AISI 1020 steel was realized by the technique of TIG welding. Ferrous boron, ferrous molybdenum, and Armco iron were used for surface alloying treatment. Before the treatment, ferrous alloys were ground and sieved to be smaller than 45 μm. The powders were mixed to be composed of $Fe_{(15-x)}Mo_{x}B_5$, where x = 1, 3, and 5 (by at.%). Prepared powders were pressed on the steel substrate and melted by TIG welding for surface alloying. Wear tests of the surface alloyed AISI 1020 steels were realized against WC-Co ball using by ball-on-disk method under the loads of 2.5, 5, and 10 N at the sliding speeds of 0.1 m/s for 250 m sliding distance. Friction coefficient and wear rates of the surface alloyed steel with $Fe_{(15-x)}Mo_{x}B_5$ alloy powder are changing between 0.30 and 0.80 and 5.86 × $10^{-5} mm^3$/m to 2.52 × $10^{-3} mm^3$/m depending on applied load and alloy composition, respectively.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 587-589
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wear Properties of TIG Surface Alloyed Steel with 50%Fe-10%W-40%B Alloy
Autorzy:
Abakay, E.
Kilinc, B.
Sen, S.
Sen, U.
Powiązania:
https://bibliotekanauki.pl/articles/1401223.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Vj
81.05.Bx
81.40.Pq
81.65.Lp
Opis:
In the present study, AISI 1020 plain carbon steel was surface alloyed with preplaced 50%Fe-10%W-40%B alloying powders using a tungsten-inert gas (TIG) heat source. Microstructure, hardness, and wear resistance of the surface alloyed layer were investigated. Following the surface alloying, conventional characterization techniques such as optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and X-ray diffraction analysis (XRD) were used to study the phase and microstructural examinations of the alloyed surfaces. Hardness measurements were performed across the alloyed zones, and wear properties of the alloyed surfaces were evaluated using a ball-on-disc wear test method. Hardness values of the phases formed in the alloyed layer are changing between 620±30 $HV_{0.1}$ and 2095±254 $HV_{0.1}$. The major phases formed in the surface alloyed layer were Fe₂B, FeB and FeW₂B₂. Wear test were realized against Alumina ball under the loads of 2.5 N, 5 N and 10 N at the sliding speed of 0.1 m/s for 250 m sliding distance. The friction coefficient of the 50%Fe-10%W-40%B alloyed steel surface is changing between 0.70 and 0.79 depending on applied loads. The wear rates of the surface alloyed steel ranged from $4.01 \times 10^{-5}$ mm³/m to $4.14 \times 10^{-4}$ mm³/m.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 957-960
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plant: a necessity of life
Autorzy:
Abubakar, B.U.
Abubakar, S.
Alaku, C.
Nnadi, O.
Powiązania:
https://bibliotekanauki.pl/articles/11487.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
Plant is one of the major forms of life on earth. It can produce its own food but cannot move about. Plants have well organized structures. They are beautiful and they determine local climates and are used as live fences. They phytoremediate and cool our environment. They provide us with oxygen, medicines, fuel, timber, recreation, industrial products; preservatives, pesticides in addition to all the three necessities of life: food, clothing and shelter. They purify the air and water bodies. It is therefore impossible to talk about life without plants because of their importance to the balance of nature. However, people have altered and often degraded their environment, though it has been taking place so gradually that its effects have not been drastically felt. Despite the enormous benefits of plants to humanity, they are disappearing at alarming rates. The reasons for this loss are many and include many anthropogenic activities. It is therefore quite imperative to ensure their effective conservation. This paper summarizes available information about the direct and the indirect benefits of plants and suggests some important measures to ensure their posterity. I hope, by bringing this information together, people will appreciate our plants and be frugal in using them.
Źródło:
International Letters of Natural Sciences; 2014, 15, 2
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena pozycji siedzącej u niemowląt w wieku 9 miesięcy przy użyciu stanowiska podoskopowego „PodoBaby”
Evaluation of sitting position in 9-month old babies by means of podoscopic system
Autorzy:
Adamska, M.
Wójtowicz, D.
Ostrowska, B.
Powiązania:
https://bibliotekanauki.pl/articles/261429.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Wydział Podstawowych Problemów Techniki. Katedra Inżynierii Biomedycznej
Tematy:
niemowlę
pozycja siedząca
motoryka spontaniczna
baby
sitting
motility
Opis:
Pozycja siedząca jest wyrazem prawidłowego rozwoju dziecka i powinna być utrzymywana przez krótki czas już w 6-tym miesiącu życia, natomiast w 9-tym miesiącu powinna być przyjmowana samodzielnie i w pełni opanowana. Dzieje się tak wtedy, gdy ośrodkowy układ nerwowy rozwija się bez zakłóceń. Dzięki temu możliwe jest prawidłowe kształtowanie się mechanizmów podporowo-wyprostnych i rozkład napięcia mięśniowego, umożliwiając tym samym utrzymywanie tej pozycji przez coraz dłuższy czas. Ocena symetrii pozycji siedzącej jest ważną informacją o funkcjonowaniu ośrodkowego układu nerwowego, rozkładzie napięcia mięśniowego i jakości wzorca ruchowego dziecka. Celem pracy była ocena pozycji siedzącej w siadzie prostym niemowląt w dziewiątym miesiącu życia za pomocą stanowiska podoskopowego PodoBaby. Badaniami objęto grupę 6 dzieci w 9 miesiącu życia. Ocenie poddano ogólną powierzchnię przylegania ciała dziecka do podłoża oraz powierzchnię przylegania prawego i lewego pośladka wraz z kończynami dolnymi. Wyniki podano w wartościach procentowych. U pięcioro dzieci stwierdzono niewielką mieszcząca się w granicach normy (< 10%) asymetrię pozycji siedzącej. Tylko u jednego dziecka asymetria przekraczała 10%, co może wskazywać na zaburzenia i wymagać interwencji terapeutycznej. Urządzenie PodoBaby może wspomagać diagnostykę neurorozwojową w zakresie motoryki spontanicznej dziecka.
The sitting position is an expression of the proper development of the child and it should be kept for a short time starting from the age of 6 months and in the 9 months old babies it should be taken alone and fully controlled by a child. This occurs when the nervous system develops without any problems. The correct development of both supporting and extension mechanisms, as well as the spread of muscle tension allows to maintain the sitting position for longer time. The measurement of symmetry in sitting position provides an important information about the functioning of the central nervous system, muscle tension and the quality of the child's motor pattern. The aim of the study was the evaluation of the sitting position among the 9 month old babies with the use of PodoBaby system. The study was conducted on a group of 6 children. The total area of the child's body adhesion to the surface and of the right and left buttock with the lower limbs, were evaluated. Five children had small (< 10%) asymmetry in the sitting position. Only one child’s asymmetry exceeded 10%, which may indicate disorders and require the therapeutic consultation. PodoBaby may be used for the diagnosis of the neuro-developmental motility of a child.
Źródło:
Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna; 2013, 19, 1; 49-54
1234-5563
Pojawia się w:
Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Knowledge Attitude and Practices of Caregivers on Management and Treatment of Childhood Malaria in Ogun State, South-Western Nigeria
Autorzy:
Agbeyangi, O. A.
Sam-Wobo, S. O.
Ekpo, U. F.
Akinloye, O. A.
Mafiana, C. F.
Ajayi, J. B.
Powiązania:
https://bibliotekanauki.pl/articles/1179169.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Ogun State
South-western Nigeria
home management of malaria
treatment seeking behaviours
Opis:
Home management of malaria involves presumptively treating febrile children at clinic or near home with antimalarial drugs distributed by trained members of the community provide medications and educate primary caregivers about treatment of malaria and recognition of severe illness. Structured questionnaires were administered to the parents, health workers and patent medicine vendors to determine acceptability of rectal artesunate and treatment seeking behaviours. Data obtained were analyzed using SPSS version 20 to assess association with p-value of < 0.05. Current first line antimalarial drug for treating childhood malaria at the PHCs was artesunate derivatives (90.3%) with no usage of chloroquine derivatives (0%) and common route of administration was intra-muscular (81.4%) with least usage of rectal (6.2%). Patent medicine vendors showed that the common drug derivatives purchase for treating childhood malaria was chloroquine derivatives (89.2%) with oral (91.9%) as most common route of administration and no awareness of rectal route (0%). Cases of resistance of malaria parasites to anti-malarial drugs, mostly chloroquine derivatives (89.3%) and least with artesunate derivatives (7.1%) observed by health workers. Incomplete dosage (95.6%) and fake drug (84.9%) were described as main factors responsible for malaria parasite resistance. Patent medicine vendors have come across cases of resistance of malaria parasites to anti-malarial drugs mostly chloroquine derivatives (93.2%) with drug abuse (89.2%) and fake drug (82.4%). Treatment of malaria is challenged by inadequate health-care infrastructure and community-based interventions.
Źródło:
World Scientific News; 2017, 83; 62-74
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Food security challenges in Nigeria: a paradox of rising domestic food production and food import
Autorzy:
Ahungwa, G.T.
Haruna, U.
Muktar, B.G.
Powiązania:
https://bibliotekanauki.pl/articles/10962.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
This paper examined the food security challenges vis-á-vis the paradox of increased domestic food production and food import in Nigeria. The study used time-series data from National Bureau of Statistic, Central Bank of Nigeria, Nigeria’s National Dailies and CIA Factbook reports. The trend analysis showed that the share of agriculture to the total Gross Domestic Product, GDP had a downward trend, especially from 1960-1979, where food import hovered around 2.92 % from 1960-74 and up to 9.85 % in 1975-79 of GDP. The result depicts an undulating trend in the contribution of agriculture and food import values to 2009 where food import rose astronomically from N2.6trillion (3.83 %) in 2005-2009 to about N20.6trillion (25.02 %) in 2010-2012. Results of the regression analysis confirmed that agriculture has a positive relationship with GDP, and contributes significantly with a coefficient of 0.852. The paradox however is that food import negates the a priori expectation as it is found to be positively related to the GDP: as food production increases marginally, food importation increases asymptotically. The paper recommends that reliance on food import could be minimized through increased budgetary allocation to the sector, and improvement in postharvest management practices that have hitherto, aggravated food insecurity in the country.
Źródło:
International Letters of Natural Sciences; 2014, 13, 1
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculations of (γ,n) Reaction Cross Sections using Different Level Density Models for Some Lanthanide Nuclei
Autorzy:
Akçaalan, U.
Ünal, R.
Sarpün, İ.
Yalim, H.
Oruncak, B.
Powiązania:
https://bibliotekanauki.pl/articles/1401985.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
21.10.Ma
Opis:
The discrete level information deficiency requires usage of level density models in cross section calculations. The total reaction cross sections for gamma-induced reactions through the six level density models with a consistent parameterization of some lanthanides ($\text{}^{141}Pr,$ $\text{}^{142}Nd,$ $\text{}^{144}Sm,$ $\text{}^{153}Eu,$ $\text{}^{159}Tb,$ $\text{}^{160}Gd,$ $\text{}^{165}Ho,$ $\text{}^{175}Lu$) were calculated using TALYS 1.6 in the incident energy range from 5 to 30 MeV. All calculations from the present study were compared with each other and with data available in the literature.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-228-B-230
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isolation of vanconycin resistant Staphylococcus aureus from the wounds of hospital patients in Uyo, Akwa Ibom State, Nigeria
Autorzy:
Anosike, I. K.
Ebana, R. U. B.
Edet, U. O.
Umoh, I. S.
Powiązania:
https://bibliotekanauki.pl/articles/1076716.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Methicillin
Staphylococcus aureus
Vancomycin
Wounds
antibiotic resistance
Opis:
Staphylococcus aureus is a very important human pathogen that generates a number of human infections. Isolation of vancomycin-resistant Staphylococcus aureus (VRSA) was carried out from wound samples of patients attending University of Uyo Teaching Hospital, Akwa Ibom state, Nigeria. A total of 45 wound samples from 15 patients were collected aseptically in triplicate, using sterile cotton swabs moistened in sterile normal saline. Microbiological analysis and susceptibility to vancomycin, including minimum inhibitory and minimum bactericidal concentrations (MIC and MBC), were carried out using standard methodologies. A total of 15 isolates were obtained and these showed varying MIC and MBC patterns. Out of the 15 S. aureus isolated, only one isolate had an MIC of approximately 4 µg/ml, while twelve isolates gave MIC values that ranged from 15.62 µg/ml to 250 µg/ml. The remaining 2 isolates gave MIC values that were ≥ 500 µg/ml. These 2 isolates exhibited alpha haemolysis on blood agar, unlike the others that were beta haemolytic. The results of the MBC also showed variations amongst the isolates. A total of 10 isolates gave MBC values that ranged from 62.5 µg/ml to 500 µg/ml, while the remaining 5 isolates gave MBC values that were ≥ 500 µg/ml. The high MIC and MBC values obtained showed that vancomycin-resistant Staphylococcus aureus is increasing at an alarming rate, and this accounts for the gradual decline in the effectiveness associated with the use of vancomycin. Given the widespread prevalence of VRSA, there is a need for newer therapeutics that can reverse this surge.
Źródło:
World News of Natural Sciences; 2019, 24; 134-144
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prevalence and antimicrobial susceptibility of Klebsiella pneumoniae isolated from hospitalized patients at General Hospital, Etim Ekpo, Akwa Ibom State, Nigeria
Autorzy:
Anosike, I. Kelechi
Edet, U. Okon
Umoafia, G. E.
Agbo, B. E.
Ejelonu, V. O.
Onyesoro, V.
Powiązania:
https://bibliotekanauki.pl/articles/1030832.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Antibiotic susceptibility
Klebsiella pneumonia
Nosocomial
Prevalence
Resistance
Opis:
Klebsiella pneumoniae (KP) was investigated in respondents presenting signs and symptoms of urinary tract infection (UTI) in a rural community. Using simple random sampling, a total of 360 respondents (144 males and 216 females) were recruited into the study following informed consent and ethical approval. Mid-stream urine samples were collected from all the respondents aseptically using standard protocol. Isolation of K. pneumoniae was done using morphological characteristics and various biochemical tests while antibiotic sensitivity testing using various antibiotics was done using guidelines of Clinical and Laboratory Standard Institute. A total of 16 samples gave positive culture representing an overall prevalence of 4.4%. Furthermore, prevalence rates of 2.8%, 5.6%, 47.82%, 4.9%, 3.50%, and 8.60% for males, females, diabetics, in-patients, out-patients, and respondents above 60 years of age respectively were obtained. Resistance to antibiotics ranged from 37.50 to 56.25% for gentamycin and nalidixic, and tarivid, respectively. There is need for preventive measures aimed at sensitization of dwellers in community settings.
Źródło:
World Scientific News; 2020, 145; 222-233
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
B₄C-CNT Produced by Spark Plasma Sintering
Autorzy:
Apak, B.
Sahin, F.
Powiązania:
https://bibliotekanauki.pl/articles/1401275.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ev
81.05.Je
81.05.U-
88.30.rh
Opis:
H.C. Starck HS Grade boron carbide (B₄C) powders with multi-walled carbon nanotube (CNT) were sintered by Spark Plasma Sintering (SPS) method in a vacuum atmosphere to obtain highly dense and fine grained final ceramic products. Powder mixtures were densified by SPS at 1650 and 1725°C using 40 MPa pressure for 5 min. The effects of heating rate, spark plasma sintering temperature and CNT additive on density, hardness, fracture toughness and microstructures of B₄C-CNT samples are investigated. Density measurements were carried out using Archimedes method. Hardness and fracture toughness were examined by Vickers indentation technique. Scanning Electron Microscope (SEM) was used to observe microstructural investigation.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1029-1031
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of heat stress on fattening performance, carcass traits, oxidant/antioxidant status, and hepatic heat shock protein 70 levels in different plumage colors of Japanese quail (Coturnix coturnix japonica)
Autorzy:
Aslan, S.
Baykalir, Y.
Simsek, U.G.
Gul, B.
Powiązania:
https://bibliotekanauki.pl/articles/16647382.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
biochemistry
carcass yield
heat stress
quail
Opis:
The aim of this study was to investigate the impact of heat stress on production performance and oxidative stress in different plumage colors of Japanese quail. For this purpose, a total of 100 birds were used in this study. The 25 birds belonged to Wild-type (n=25, grey), Tuxedo (n=25, black), Golden (n=25, yellow) and Recessive white (n=25). The birds were reared for 42 days in an environmentally controlled room at 39°C and relative humidity of 60-65%. The body weight, body weight gain (g/bird/day), and feed conversion ratio were not different between the groups (p>0.05). However, the feed intake (g/bird/day) of the Wild-type had a higher value than the Tuxedo (black) group counterparts between 15 and 21 days different (p<0.05). There was no significant effect of heat stress on the carcass traits (p>0.05). Spleen weights were different between the groups (p<0.05). The yellow group had the highest spleen weight. The highest MDA level was found in the Recessive White variety, followed by Wild-type (grey), Golden (yellow) and Tuxedo (black), respectively. However, there were no statistical differences amongst the groups (p>0.05). There was also no statistical significance in glutathione (GSH) and superoxide dismutase (SOD) levels (p>0.05). The heat shock protein 70 kDa (HSP70) level was significantly different between the groups (p<0.001). The highest percentage was observed in the Golden (5.06%) and the lowest in the White (1.43%) variety. There was no superior color variety of Japanese quail regarding fattening performance and carcass traits. It is conceivable that when considering the stress response of the different colors, the Golden group is more sensitive to stress due to the hepatic and cellular level of HSP70.
Źródło:
Polish Journal of Veterinary Sciences; 2022, 25, 4; 599-605
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 726

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