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Tytuł:
Application of D-optimal design for optimizing copper-molybdenum sulphides flotation
Autorzy:
Nakhaei, F.
Irannajad, M.
Sam, A.
Jamalzadeh, A.
Powiązania:
https://bibliotekanauki.pl/articles/110187.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
copper
molybdenum
flotation
chemical reagents
D-optimal
optimization
Opis:
Froth flotation is widely used for concentration of base metal sulphide minerals in complex ores. One of the major challenges faced by flotation of these ores is selection of the type of flotation reagents. In this study, the D-optimal experimental design method was applied to determine the optimum conditions for flotation of copper and molybdenum in the rougher flotation circuit of the Sungun copper concentrator plant. The investigated parameters included types and dosages of collectors and frothers, diesel dosage and feed size distribution. The main effects on copper and molybdenum recoveries and grades were evaluated. Results of optimization showed that the highest possible grade and recovery were obtained for Z11 as a primary collector (20 g/Mg), R407 as a first promoter collector (20 g/Mg), X231 as a second promoter collector (7 g/Mg), A65 (15 g/Mg) and Pine oil as frothers (5 g/Mg), 20 g/Mg of diesel dosage, and d80 of feed size was equal to 80 μm. The analysis of variance showed that the primary promoter collector was the most significant parameter affecting the recovery of Cu, while diesel dosage and d80 were the most significant parameters influencing the Mo recovery.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 1; 252-267
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The synergistic effect of piperonyl butoxide on the molluscicidal potential of monoterpenes and phenylpropenes against Theba pisana
Autorzy:
Abdelgaleil, S.A.M.
Saad, M.M.G.
Powiązania:
https://bibliotekanauki.pl/articles/65844.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
synergistic effect
piperonyl butoxide
molluscicidal activity
molluscicidal potential
monoterpene
phenylpropene
Theba pisana
mollusc
white garden snail
sand hill snail zob.white garden snail
white Italian snail zob.white garden snail
Mediterranean coastal snail zob.white garden snail
Mediterranean snail zob.white garden snail
snail
Opis:
The molluscicidal activity of six monoterpenes and two phenylpropenes against Theba pisana adults was evaluated using fumigation and direct contact methods. In the fumigant toxicity assay, (-)-citronellal showed the highest toxicity with LC50 value of 7.79 µl · l−1 air after 24 h of treatment, followed by (-)-terpinen-4-ol (LC50 = 12.06 µl · l−1), (-)-menthone (LC50 = 12.28 µl · l−1 air) and p-cymene (LC50 = 16.07 µl · l−1 air). Eugenol and trans-cinnamaldehyde were the most potent contact toxicants against T. pisana. Their LD50 values were 0.18 and 0.29 mg · snail−1 after 24 h of treatment, respectively. These two compounds were more toxic than a reference molluscicide, methomyl. In contrast, α-terpinene and (-)-citronellal were the least toxic compounds. In another experiment, the synergistic effect of piperonyl butoxide (PBO) on tested monoterpenes and phenylpropenes by topical application was examined. The results showed that the toxicity of the tested compounds was increased when mixed with PBO at a ratio [compound/PBO (1 : 2)] except for α-pinene and (-)-terpinen-4-ol in which the toxicity of binary mixtures was less than for single compounds. The synergistic effect of PBO improved with increased exposure time. The highest synergistic effect was observed with (-)-menthone and α-terpinene with synergistic ratios of 9.25 and 4.37, respectively. Monoterpenes and phenylpropenes and their mixtures with PBO described herein merit further studies as potential T. pisana control agents.
Źródło:
Journal of Plant Protection Research; 2018, 58, 4
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on controlling Setaria viridis and Corchorus olitorius associated with Phaseolus vulgaris growth using natural extracts of Chenopodium album
Autorzy:
El-Rokiek, K.G.
El-Din, S.A.S.
Shehata, A.N.
El-Sawi, S.A.M.
Powiązania:
https://bibliotekanauki.pl/articles/66191.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
controlling
Setaria viridis
Corchorus olitorius
Phaseolus vulgaris
growth
leaf extract
Chenopodium album
bean
flavonoids
polyphenol
root extract
plant extract
Opis:
The effects of water extracts of Chenopodium album leaves and roots on the growth of grass weed (Setaria viridis) and broad leaf weed (Corchorus olitorius) grown with beans (Phaseolus vulgaris) in greenhouse pots were studied in the National Research Centre, Giza, Egypt. In this experiment fresh leaf and root extracts and their corresponding dry leaf and root extracts at different concentrations were used. There were significant inhibitions in the dry weights of S. viridis and C. olitorius by all extracts at the flowering stage of beans and at harvest. The inhibition effect of all C. album extracts on both weeds (dry weight/pot) depended on the extracted plant organ (leaf or root), its fresh or dry form as well as its concentrations. The inhibition caused by the leaf extract was much higher on weed growth than that of root extract. A higher concentration of fresh leaf extract (25%) had the highest significant inhibition effect. The results also indicated that C. olitorius was more sensitive to the extracts than S. viridis. On the other hand, the inhibition effect of the extracts on the growth of both weeds was accompanied by increased bean growth and yield/plant. The analysis of both leaf and root extracts of C. album revealed that the total content of polyphenols and flavonoids in the leaf extract was more than triple that of the root extract. The results suggested that the fresh leaf extract of C. album may be a possible tool for the development of weed control using natural herbicides.
Źródło:
Journal of Plant Protection Research; 2016, 56, 2
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
InAs/InAsSb superlattice infrared detectors
Autorzy:
Ting, David Z.
Soibel, Alexander
Khoshakhlagh, Arezou
Keo, Sam A.
Rafol, Sir B.
Fisher, Anita M.
Hill, Cory J.
Pepper, Brian J.
Maruyama, Yuki
Gunapala, Sarath D.
Powiązania:
https://bibliotekanauki.pl/articles/2204211.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
infrared detector
type-II superlattice
InAs/InAsSb
complementary barrier infrared detectors
strained layer superlattice
Opis:
Mid-wavelength infrared detectors and focal plane array based on n-type InAs/InAsSb type- II strained layer superlattice absorbers have achieved excellent performance. In the long and very long wavelength infrared, however, n-type InAs/InAsSb type-II strained layer superlattice detectors are limited by their relatively small absorption coefficients and short growth-direction hole diffusion lengths, and consequently have only been able to achieve modest level of quantum efficiency. The authors present an overview of their progress in exploring complementary barrier infrared detectors that contain p-type InAs/InAsSb type-II strained layer superlattice absorbers for quantum efficiency enhancement. The authors describe some representative results, and also provide additional references for more indepth discussions. Results on InAs/InAsSb type-II strained layer superlattice focal plane arrays for potential NASA applications are also briefly discussed.
Źródło:
Opto-Electronics Review; 2023, 31, Special Issue; art. no. e144565
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Long wavelength type-II superlattice barrier infrared detector for CubeSat hyperspectral thermal imager
Autorzy:
Rafol, Sir B.
Gunapala, Sarath D.
Ting, David Z.
Soibel, Alexander
Khoshakhlagh, Arezou
Keo, Sam A.
Pepper, Brian J.
Hill, Cory J.
Maruyama, Yuki
Fisher, Anita M.
Sood, Ashok
Zeller, John
Wright, Robert
Lucey, Paul
Nunes, Miguel
Flynn, Luke
Babu, Sachidananda
Ghuman, Parminder
Powiązania:
https://bibliotekanauki.pl/articles/2204204.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
type-II superlattice
focal plane array
infrared detector
quantum efficiency
noise equivalent difference temperature
dark current density
anti-reflective coating
Opis:
The hyperspectral thermal imaging instrument for technology demonstration funded by NASA’s Earth Science Technology Office under the In-Space Validation of Earth Science Technologies program requires focal plane array with reasonably good performance at a low cost. The instrument is designed to fit in a 6U CubeSat platform for a low-Earth orbit. It will collect data on hydrological parameters and Earth surface temperature for agricultural remote sensing. The long wavelength infrared type-II strain layer superlattices barrier infrared detector focal plane array is chosen for this mission. With the driving requirement dictated by the power consumption of the cryocooler and signal-noise-ratio, cut-off wavelengths and dark current are utilized to model instrument operating temperature. Many focal plane arrays are fabricated and characterised, and the best performing focal plane array that fulfils the requirements is selected. The spectral band, dark current and 8-9.4 μm pass band quantum efficiency of the candidate focal plane array are: 8-10.7 μm, 2.1∙10ˉ⁵ A/cm², and 47%, respectively. The corresponding noise equivalent difference temperature and operability are 30 mK and 99.7%, respectively. Anti-reflective coating is deposited on the focal plane array surface to enhance the quantum efficiency and to reduce the interference pattern due to an absorption layer parallel surfaces cladding material.
Źródło:
Opto-Electronics Review; 2023, 31, Special Issue; art. no. e144569
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parameter Characterization in Processing of Silver - Aluminum Based Electrical Contact Materials
Autorzy:
Praveen Kumar, S.
Parameshwaran, R.
Ananthi, A.
Jenil Jaba Sam, J.
Powiązania:
https://bibliotekanauki.pl/articles/352711.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrical contactor
silver
aluminum
tin oxide
conduction
Opis:
An electrical contractor is one which plays significant role in day todays life in industries as well as in home appliances. In current scenario the materials for conducting purpose has an overwhelming research capability. Now a day the silver based electrical contact composite material have provided the potential applications in aerospace and automobile industries. Among silver based contact material the silver cadmium oxide and silver tin oxide plays a vital role in fabrication of electrical contactors. In this research an attempt has been made to study the influence of adding Aluminum with silver based electrical contact composite materials by two different processing routes namely stir-casting and powder metallurgy. Silver and aluminum matrix plays a virtual role in composite world owing to their highest conductivity. Optimum parameters were identified for attaining the maximum properties such as conductivity, hardness, density, and porosity of composition. By this better conducting property and mechanical property of the electrical contact can be improved by this system. Thus a screening test has be conducted with addition of Al with silver tin oxide compositions hence this paper aims to process the aluminum – silver based electrical contact materials by stir casting processing and powder metallurgy route and compare the results obtained.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1895-1901
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Community Based Management, Environmental Factors and Ecological Patterns Associated with Malaria Parasites Transmission in the Communities of Children Treated with Rectal Artesunate in Ogun State, South-Western Nigeria
Autorzy:
Agbeyangi, O. A.
Sam-Wobo, S. O.
Ekpo, U. F.
Akinloye, O. A.
Mogaji, H. O.
Oluwole, A. S.
Bello, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/1178283.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Community-based management
Ogun State
South-western Nigeria
malaria
mosquitoes vegetation topographic environmental management
Opis:
Community-based case management of malaria has been shown to be effective in reducing mortality and morbidity. Overall total of 183 communities comprising 36(19.7%) communities in Egba Goe-Political Zone (GPZ), 56(30.6%) in Yewa-Awori GPZ, 43(23.5%) in Remo GPZ, and 48(26.2%) in Ijebu GPZ. There was a significant (p = 0.011) difference between preventive measures against malaria adopted for children across LGAs. Involvement in environmental management /sanitation as part of control measure (78.0%) can mostly help in tackling the adverse effects of malaria parasites transmission. They also agreed that mosquitoes breed majorly in stagnant water (77%) and Ponds (74.6%) and they did not always use (54.4%) their ITN/LLITN and their family mostly used ITN/LLITN during rainy season (84.4%). Fresh-water Rain Forest (44.3%) and Lowland Rain Forest (43.2%) are common forest vegetation types. Communities having plains topographical structure were more (91.3%) with close/compact (54.6%) type of settlement and are more densely populated (51.9%). Water bodies present are small rivers (100%). House type common in the communities was mud with iron sheets (100%) and drainage system (36.2%) was not common. Communities Involvement in environmental management/sanitation as part of control measure will reduce malaria parasite transmission.
Źródło:
World Scientific News; 2017, 86, 3; 150-167
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Socio-Cultural and Economic Factors Associated with Home Management and Treatment Seeking Behaviours of Malaria among Parents of Children Treated with Rectal Artesunate in Ogun State, South-Western Nigeria
Autorzy:
Agbeyangi, O. A.
Sam-Wobo, S. O.
Ekpo, U. F.
Akinloye, O. A.
Mafiana, C. F.
Powiązania:
https://bibliotekanauki.pl/articles/1178295.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Home Management of Malaria
Ogun State
Socio-Cultural and Economic Factors
South-Western Nigeria
Treatment Seeking Behaviours
Opis:
Home management and treatment seeking behaviours of malaria was assessed among parents of 905 under five years children from 183 rural communities in 8 Local Government Areas (LGAs). Ethical approvals were obtained in addition to interactive sessions with parents and structured questionnaires were administered to the parents. Data obtained were analyzed using SPSS version 20 to assess association with p-value of < 0.05. A significant (p < 0.05) relationship observed between socio-economic factors and treatment seeking behaviours and preventive measures. There was no significant (p = 0.614) difference between symptoms observed in children across the LGAs. There was no significant (p = 0.061, p = 0.059, p = 0.071) relationship between parents demographic characteristics (age, sex and ethnicity) and preventive measures while educational status has a significant (p = 0.043) relationship. There was a significant (p = 0.042, p = 0.021) relationship between occupation and monthly income and preventive measures. Educational status was significantly (p = 0.013) related to knowledge on malaria while monthly income was not significantly (p = 0.201) related. Also there was a significant (p = 0.000 and p = 0.000) relationship between both educational status and monthly income and treatment seeking behaviours and are positively correlated (r = +0.101 and r = +0.136). Effectiveness of home management of malaria (HMM) and treatment seeking behaviours is challenged by the prevailing socio-cultural and economic issues.
Źródło:
World Scientific News; 2017, 86, 3; 304-321
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficacy of Rectal Artesunate on Parasitaemia and Febrile Condition of Children of Ogun State, South-Western Nigeria
Autorzy:
Agbeyangi, O. A.
Sam-Wobo, S. O.
Ekpo, U. F.
Akinloye, O. A.
Mafiana, C. F.
Powiązania:
https://bibliotekanauki.pl/articles/1179244.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Children
Efficacy
Febrile Condition
Malaria
Ogun State
Parasitaemia
Pre-Referral
Rectal Artesunates
South-Western Nigeria
Opis:
Efficacy of Rectal Artesunate on parasitaemia and febrile condition of children was assessed in 905 children below the age of 5 years. Grid systematic method was employed in selecting sixteen study centres from 8 Local Government Areas of Ogun State. Ethical approvals were obtained in addition to interactive sessions with parents of the children and PHCs medical practitioners. Body weight and temperature were taken and drug was administered at a dose of 5 to 10mg/kg of the body weight per rectum at 0 hour, 24 hours and 48 hours. Efficacy of treatment was monitored by analysing blood samples taken at 0 hour, 24 hours and 48 hours for Malaria Parasites Count (MPC/µl), parasitized red blood cells (PRBC). Data obtained were analyzed using SPSS version 20 to assess association with p-value of < 0.05. A significant (p < 0.05) difference was observed between malaria parasites prevalence at 0 hour, 24 hours and 48 hours. Also a baseline mean malaria parasite density (MPC/µl) of 3,320/μl was observed at 0 hour and a reduction in mean MPC/µl of 1,230/μl and 420/μl at 24 hours and 48 hours respectively with a significant (p < 0.05) difference between MPC/µl at 0 hour, 24 hours and 48 hours. Baseline mean parasitized red blood cells (PRBC) of 4.2 % was observed at 0 hour with reduction in mean PRBC of 2.4 % and 1.1 % at 24 and 48 hours respectively with a significant (p < 0.05) difference between PRBC at 0 hour, 24 hours and 48 hours. Fever Subsidence Ratio between 0 hour, 24 hours and 48 hours were 1.4:1.1. Rectal artesunate is highly effective and well tolerated antimalarial suppository for pre-referral and parenteral therapy.
Źródło:
World Scientific News; 2017, 80; 116-142
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Rectal Artesunate on Haematological Parameters of Children of Ogun State, South-Western Nigeria
Autorzy:
Agbeyangi, O. A.
Sam-Wobo, S. O.
Ekpo, U. F.
Akinloye, O. A.
Mafiana, C. F.
Powiązania:
https://bibliotekanauki.pl/articles/1179588.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Anaemia
Children
Effectiveness
Malaria
Ogun State
Rectal Artesunates
South-western Nigeria
Opis:
Impact of Rectal Artesunate on haematological parameters was assessed in 905 children below the age of 5 years. Grid systematic method was employed in selecting sixteen study centres from 8 Local Government Areas of Ogun State. Ethical approvals were obtained in addition to interactive sessions with parents of the children and PHCs medical practitioners. Drug was administered at a dose of 5 to 10mg/kg of the body weight per rectum at 0 hour, 24 hours and 48 hours. Data obtained were analyzed using SPSS version 20 to assess association with p-value of < 0.05. Impact of Rectal Artesunate was monitored by analysing blood samples taken at 0 hour, 24 hours and 48 hours for Packed Cells Volume (PCV) and Haemoglobin concentration (Hb). There was a significant (p < 0.05) increase in baseline PCV (L/L) and Hb (g/L) during 48 hours across the LGAs. Parasitaemia (MPC/µl) in children has a significant (p < 0.05) association with anaemia (PCV and Hb) and was positively correlated (r = +0.348 and r =+ 0.201). A significant (p < 0.05) difference observed between MCV (fl), MCH (pg) and MCHC (g/L) at 0 hour and MCV (fl), MCH (pg) and MCHC (g/L) at 48 hours. More awareness on the use of Rectal Artesunate in reducing anaemia due to malaria in children should be created since it is highly effective antimalarial suppository.
Źródło:
World Scientific News; 2017, 74; 80-93
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 13

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