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Wyświetlanie 1-15 z 5973
Tytuł:
Microstructure silica leached by NaOH from semi-burned rice husk ash for moisture adsorbent
Autorzy:
A’yuni, D.Q.
Subagio, A.
Hadiyanto, H.
Kumoro, A.C.
Djaeni, M.
Powiązania:
https://bibliotekanauki.pl/articles/2175795.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
microstructure
moisture absorption
silica
rice husk ash
mikrostruktura
absorpcja wilgoci
krzemionka
popiół z łusek ryżu
Opis:
Purpose: This work aims to study the water vapor adsorption property of fine silica particles from semi-burned rice husk ash. The semi-burned rice husk ash is selected as the raw material since it contains high silica and is easily found as a by-product of pottery furnace combustion. Design/methodology/approach: The silica adsorbent from semi-burned rice husk ash was prepared through a sol-gel method using various NaOH concentrations. In doing so, the different pH precipitation was also observed. Here, the fine silica powder was obtained by pulverizing dry sol-gel. The product characterizations were conducted based on water adsorption capacity at different air relative humidity. Findings: The results show no significant effects of different treatments in the extraction and gelation process. The fine silica particles exhibit large porous surfaces with agglomerated nano-sized particles that formed pores. This porous structure is related to the distributions of pore size of each sample, which mostly obey the mesoporous characteristics. From sorption isotherm, weak adsorbent-adsorbate bonding was observed and demonstrated multilayer adsorption of mesoporous materials. Research limitations/implications: The study of water adsorption was carried out at room temperature, which can change at any time, even though has no significant effect on the humidity. However, it is needed to study the adsorption in an incubated area to receive a constant temperature. Practical implications: The products namely silica prepared from semi-burned rice husk ash show a high moisture uptake, especially at a high relative humidity region. This property can be comparable with the other silica preparation methods. So, this product can be a highly potential adsorbent for air or gas dehumidification systems. Originality/value: The silica-based semi-burned rice husk ash as a water adsorbent is more sustainable than commercial silica. This is a positive contribution to find a potentially develop water vapor adsorbent with good adsorption capacity. Besides, the synthesis process is a simple and low-cost process.
Źródło:
Archives of Materials Science and Engineering; 2021, 108, 1; 5--15
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role of probiotics in nutrition and health of small ruminants
Autorzy:
Abd El-Trwab, M>M>
Youssef, I.M/.I.
Bakr, H.A.
Fthenakis, G.C.
Giadinis, N.D.
Powiązania:
https://bibliotekanauki.pl/articles/31675.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Small ruminants represent an important economic source in small farm systems and agriculture. Feed is the main component of livestock farming, which has gained special attention to improve animal performance. Many studies have been done to improve feed utilisation through addition of feed additives. For a long period, antibiotics have been widely used as growth promoters in livestock diets. Due to their ban in many countries, search for alternative feed additives has been intensified. Probiotics are one of these alternatives recognised to be safe to the animals. Use of probiotics in small ruminant nutrition has been confirmed to improve animal health, productivity and immunity. Probiotics improved growth performance through enhancing of rumen microbial ecosystem, nutrient digestibility and feed conversion rate. Moreover, probiotics have been reported to stabilise rumen pH, increase volatile fatty acids production and to stimulate lactic acid utilising protozoa, resulting in a highly efficient rumen function. Furthermore, use of probiotics has been found to increase milk production and can reduce incidence of neonatal diarrhea and mortality. However, actual mechanisms through which probiotics exert these functions are not known. Since research on application of probiotics in small ruminants is scarce, the present review attempts to discuss the potential roles of this class of feed additives on productive performance and health status of these animals.
Źródło:
Polish Journal of Veterinary Sciences; 2016, 19, 4
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Back to nature: henna extracts from nanotech to environmental biotechnology – a review
Autorzy:
Abd-El-Haleem, D.A.M.
Powiązania:
https://bibliotekanauki.pl/articles/28825290.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2023, 104, 4; 421-434
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Silicon-on-Insulator technology for imaging and application to a switching photodetector
Autorzy:
Abdo, N.
Sallin, D.
Koukab, A.
Estribeau, M.
Magnan, P.
Kayal, M.
Powiązania:
https://bibliotekanauki.pl/articles/397865.pdf
Data publikacji:
2015
Wydawca:
Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
Tematy:
photodetectors
silicon-on-insulator
fotodetektory
SOI
Opis:
This paper analyzes some advantages of Silicon-on-Insulator (SOI) based photodetectors for low light imaging. It shows that SOI based sensors not only solve the bulk carriers problem, it can also act as a very selective spectral filter by acting as a resonant cavity, which is useful in application with a very narrow spectrum of interest, such as bioluminescence imaging. The SOI implementation of a switching photodetector based with an hybrid MOS-PN structure is presented and its advantages in terms of dark current minimization and SNR improvement highlighted.
Źródło:
International Journal of Microelectronics and Computer Science; 2015, 6, 4; 136-141
2080-8755
2353-9607
Pojawia się w:
International Journal of Microelectronics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of the Moulding Process of Bentonite-Bonded Green Sand
Autorzy:
Abdulamer, D.
Kaduaw, A.
Powiązania:
https://bibliotekanauki.pl/articles/1837740.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
green sand mould
moulding processes
COMSOL multiphysics
time-dependent study
Opis:
Finite Element Method FEM via commercially available software has been used for numerical simulation of the compaction process of bentonite-bonded sand mould. The mathematical model of soil plasticity which involved Drucker-Prager model match with Mohr Coulomb model was selected. The individual parameters which required for the simulation process were determined through direct shear test based on the variation of sand compactability. The novelty of this research work is that the individual micro-mechanical parameters were adopted depend on its directly proportional to the change of sand density during the compaction process. Boundary conditions of the applied load, roller and fixed constraint were specified. An extremely coarse mesh was used and the solution by time-dependent study was done for investigation of material-dependent behaviour of green sand during the compaction process. The research implemented also simulation of the desired points in sand mould to predict behaviour of moulding process, and prevent failure of the sand mould. Distance dependent displacement and distance-dependent pressure have been determined to investigate the effective moulding parameters without spent further energy and cost for obtaining green sand mould. The obtained numerical results of the sand displacement show good agreement with the practical results.
Źródło:
Archives of Foundry Engineering; 2021, 21, 1; 67-73
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of the Moulding Process of Bentonite-Bonded Green Sand
Autorzy:
Abdulamer, D.
Kaduaw, A.
Powiązania:
https://bibliotekanauki.pl/articles/1837861.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
green sand mould
moulding processes
COMSOL multiphysics
time-dependent study
Opis:
Finite Element Method FEM via commercially available software has been used for numerical simulation of the compaction process of bentonite-bonded sand mould. The mathematical model of soil plasticity which involved Drucker-Prager model match with Mohr Coulomb model was selected. The individual parameters which required for the simulation process were determined through direct shear test based on the variation of sand compactability. The novelty of this research work is that the individual micro-mechanical parameters were adopted depend on its directly proportional to the change of sand density during the compaction process. Boundary conditions of the applied load, roller and fixed constraint were specified. An extremely coarse mesh was used and the solution by time-dependent study was done for investigation of material-dependent behaviour of green sand during the compaction process. The research implemented also simulation of the desired points in sand mould to predict behaviour of moulding process, and prevent failure of the sand mould. Distance dependent displacement and distance-dependent pressure have been determined to investigate the effective moulding parameters without spent further energy and cost for obtaining green sand mould. The obtained numerical results of the sand displacement show good agreement with the practical results.
Źródło:
Archives of Foundry Engineering; 2021, 21, 1; 67-73
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using Singular Value Decomposition (SVD) as a solution for search result clustering
Autorzy:
Abdulla, H. D.
Abdelrahman, A. S.
Snasel, V.
Powiązania:
https://bibliotekanauki.pl/articles/377259.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
singular value decomposition
clustering
self-organizing map
Opis:
There are many search engines in the web, but they return a long list of search results, ranked by their relevancies to the given query. Web users have to go through the list and examine the titles and (short) snippets sequentially to identify their required results. In this paper we present how usage of Singular Value Decomposition (SVD) as a very good solution for search results clustering. Results are presented by visualizing neural network. Neural network is responsive for reducing result dimension to two dimensional space and we are able to present result as a picture that we are able to analyze.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2014, 80; 71-78
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compact partially ordered sets
Autorzy:
Abian, A.
Martin, A. D.
Powiązania:
https://bibliotekanauki.pl/articles/744778.pdf
Data publikacji:
1990
Wydawca:
Polskie Towarzystwo Matematyczne
Opis:
The article contains no abstract
Źródło:
Commentationes Mathematicae; 1990, 30, 1
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multidimensional poverty among rural households in ogun state, Nigeria
Autorzy:
Aboaba, Kazeem
Oyekale, Tolulope
Adewuyi, Samuel
Dada, D. A.
Powiązania:
https://bibliotekanauki.pl/articles/1911933.pdf
Data publikacji:
2019-12-28
Wydawca:
Uniwersytet Przyrodniczy w Poznaniu. Wydawnictwo Uczelniane
Tematy:
poverty
Multidimensional Poverty Index
logistic regression
Opis:
This study was carried out to estimate factors influencing the multidimensional poverty status of rural households in Ogun State, Nigeria. A multistage sampling technique was used to select 240 rural households. Data was obtained through the use of a structured interview schedule, and was analyzed with descriptive techniques, multidimensional poverty index and logistic regression models. The result revealed that 69% of the rural households are multidimensionally poor. It was found that (on average) the rural poor households were deprived in 41% of the weighted indicators. Another finding is that rural households were deprived in 28% of total deprivations they could experience. It was also revealed that deprivation in infrastructure contributed most to the total deprivation experienced, followed by deprivation in living standard, social capital, health and education. The study further found that household size (p < 0.05), gender (p < 0.01), off-farm income (p < 0.1), availability of community health extension workers (p < 0.05) and availability of public market (p < 0.1) significantly influence the poverty status of rural households. The study concluded that an increase in household size increases the likelihood of being multidimensionally poor while an increase in off-farm income, access to public market and health extension services reduce the likelihood of being poor. The study recommended that rural farmers diversify their livelihood sources into off-farm activities during their lean periods as this will be instrumental in reducing their poverty status. Also, infrastructural facilities such as good healthcare services and public markets should be put in place as this will go a long way in reducing the poverty status of the rural farmers.
Źródło:
Journal of Agribusiness and Rural Development; 2019, 54, 4; 335-344
1899-5241
Pojawia się w:
Journal of Agribusiness and Rural Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 5973

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