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Wyświetlanie 1-15 z 1144
Tytuł:
Some geometric properties of typical compact convex sets in Hilbert spaces
Autorzy:
de Blasi, F. S.
Powiązania:
https://bibliotekanauki.pl/articles/1217210.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
An investigation is carried out of the compact convex sets X in an infinite-dimensional separable Hilbert space , for which the metric antiprojection $q_X(e)$ from e to X has fixed cardinality n+1 ($n ⊆ ℕ$ arbitrary) for every e in a dense subset of . A similar study is performed in the case of the metric projection $p_X(e)$ from e to X where X is a compact subset of .
Źródło:
Studia Mathematica; 1999, 135, 2; 143-162
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of occupational exposure to wood dust among sawmill workers within the Gert Sibande District Municipality, South Africa
Autorzy:
Rathipe, M.
Raphela, F.S.
Powiązania:
https://bibliotekanauki.pl/articles/28761740.pdf
Data publikacji:
2022
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2022, 29, 4; 483-488
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical relationship between leaf litter and tree growth characteristics of Tectona grandis species
Autorzy:
Eguakun, F. S.
Job, M.
Powiązania:
https://bibliotekanauki.pl/articles/1112678.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Correlate
Forest
Litter
Nutrient
Productivity
Tectona grandis
Opis:
Forest productivity relies on the quantity and quality of litter as this influences nutrient cycling in the ecosystem. Many studies have been carried out on litter fall, but few attempts has been made to relate litter fall nutrient content with tree growth variables The aim of this work was to investigate basic relationships between the leaf litter nutrient content of Tectona grandis and tree growth characteristics. The study was done at the arboretum of the Department of Forestry and Wildlife Management, University of Port Harcourt, Rivers State, Nigeria. Data were collected from four (4) randomly selected 20m × 20m (0.04ha) plots. Within each plots, four (4) litter traps at 8m apart was set at random to collect litter on a weekly basis, while tree growth variables were measured on trees around the trap. The collected litter was put into zip-lock bags and taken to the laboratory for nutrient content analysis. Nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), sodium (Na), magnesium (Mg) content and pH were included in this. The result shows that the average weekly leaf litter collected from the trap was 11.8g. In terms of average nutrient content, Nitrogen had the highest average at 1.8, while Sodium (Na) had the lowest value at 0.14. Among the tree growth variables, only height had a positive correlation with litter collected. The results also show that Nitrogen micronutrient content was related to the amount of litter collected (0.536). In addition, all the exchangeable base analysed in the study were also related to the amount of litter collected. Conclusively, the amount of litter produced is a major indicator of primary productivity because as litter quantity increases, available nutrient content for plant growth also increases, hence, having influence on tree height.
Źródło:
World News of Natural Sciences; 2018, 18, 2; 252-261
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Health applications and grid technologies
Autorzy:
Fadi-Sotiris Salloum, F. S.
Powiązania:
https://bibliotekanauki.pl/articles/309493.pdf
Data publikacji:
2005
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
grid technologies
health applications
health grid
genomic medicine
grid enable pharmaceutical
open grid services
distributed system
Opis:
Biology and genomics in the near future will play a major role in day to day activities related with health. Today biologists and doctors work together in order to decode and analyze large amount of data extracted from the DNA analysis of proteins. Advanced health applications will be needed in order to store, retrieve, process the large amount of data - being produced today by genomics and bioinformatics analysis - in order to extract useful results in a reasonable time frame. In this paper we present the results from our research regarding the use of grid technologies with health applications. We present the current status of standardization activities and working groups, which are currently involved with the specification of health applications and the standardization of needed components such us security, functionality, etc., which are being introduced by the use of grid technologies.
Źródło:
Journal of Telecommunications and Information Technology; 2005, 4; 84-89
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Moisture Absorption and Desorption in Flax and Hemp Fibres and Yarns
Absorpcja i desorpcja wilgoci w przędzach lnianych i konopnych
Autorzy:
Mustata, A.
Mustata, F. S. C.
Powiązania:
https://bibliotekanauki.pl/articles/232968.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
fibre
yarn
electrical resistance
mechanical properties
hygroscopicity
włókna
przędza
opór elektryczny
właściwości mechaniczne
higroskopijność
Opis:
The aim of this paper is to present research work about the mode in which the water sorption- desorption process is influenced by the type of spinning yarns (dry or wet) and by the type of roving treatment (boiling or bleaching) in the case of flax and hemp yarns. The hygroscopic properties of fibres, yarns and woven fabrics from flax and hemp boiled or bleached were investigated at different relative humidities. The saturation limit of moisture absorption of the fibres varies depending on the source as well as pre-treatment of the sample. The effect of water quantity absorbed on the electrical resistance of the fibres and yarns and on the mechanical properties was examined.
Przedstawiono badania dotyczące sorpcji i desorpcji wilgoci włókien, przędz i tkanin gotowanych i bielonych prowadzone w warunkach różnej wilgotności względnej. Badano również wpływ absorpcji wody na oporność elektryczną włókien i przędz oraz wpływ na ich właściwości mechaniczne.
Źródło:
Fibres & Textiles in Eastern Europe; 2013, 3 (99); 26-30
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new multi-objective optimization algorithm based on differential evolution and neighborhood exploring evolution strategy
Autorzy:
Lobato, F. S.
Steffen, Jr, V.
Powiązania:
https://bibliotekanauki.pl/articles/91590.pdf
Data publikacji:
2011
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
multi-objective optimization
differential evolution
neighborhood exploring
evolution strategy
sorting strategy
Opis:
In this paper a new optimization algorithm based on Differential Evolution, non-dominated sorting strategy and neighborhood exploration strategy for guaranteeing convergence and diversity through the generation of neighborhoods of different sizes to potential candidates in the population is presented. The performance of the algorithm proposed is validated by using standard test functions and metrics commonly adopted in the specialized literature. The sensitivity analysis of some relevant parameters of the algorithm is performed and compared with the classical DE algorithm without the strategy of neighborhood exploration and with other state-of-the-art evolutionary algorithms.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2011, 1, 4; 259-267
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Forecasting carbon sequestered in leaf litter of Tectona grandis species using tree growth variables
Autorzy:
Eguakun, F. S.
Abraham, G. B.
Powiązania:
https://bibliotekanauki.pl/articles/1177778.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Carbon
Correlate
Equations
Forest
Litter
Sequestration
Significant
Tectona grandis
Opis:
Forests have several pools that acts as carbon sink to atmospheric carbon which is released by anthropogenic causes. Leaf litter is one of those very important pools whose role in nutrient cycling and carbon sequestration cannot be overemphasized. This study was conducted to develop equations for carbon stored in leaf litter of Tectona grandis using tree growth characteristics as explanatory variables. Data was collected from four 20 m × 20 m sample plots which were randomly selected. Within each plots, four litter traps were set to collect leaf litter on a weekly basis. The collected litter was further taken to the laboratory for carbon analysis. The tree growth variables measured in the plots were processed into suitable form for statistical analyses using descriptive statistics in form of tables, charts and graphs and inferential statistics using correlation and regression analysis. Different equation were developed and tried with different tree growth characteristics with a view to select the best equation among the simulated ones. The equation with a highest coefficient of determination (R2) and lowest standard error of estimate (SEE) was selected as the best fit. The average leaf litters produced per day ranged from 2.26g/m2 to 7.67g/m2, the maximum and minimum values of carbon stored in the studied species was 63%, 59% respectively. All the tried equations were significant and fit the data set well. The result showed that the logarithm equation has the highest R2 and lowest SEE values and was therefore selected as the best model. Result from the validated models showed that all tried equations except the exponential equation were good for prediction. Conclusively, the ability of the forest to sequester carbon is a function of the biomass production which is linked to the litter fall produced by the system. Since litter fall represent a major flux for the transfer of carbon and other nutrients between the vegetation and soil, it should therefore not be altered in order not to have an effect on below ground processes. Even though the scope of this study only covers a very small area and sample of the Nigeria forest, it is still very important for prediction of leaf litter carbon and hence, served as a tool for sustainable forest management.
Źródło:
World Scientific News; 2018, 100; 197-212
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ambiguous loci of the farthest distance mapping from compact convex sets
Autorzy:
De Blasi, F. S.
Myjak, J.
Powiązania:
https://bibliotekanauki.pl/articles/1289917.pdf
Data publikacji:
1995
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
Let be a strictly convex separable Banach space of dimension at least 2. Let K() be the space of all nonempty compact convex subsets of endowed with the Hausdorff distance. Denote by $K^0$ the set of all X ∈ K() such that the farthest distance mapping $a ↦ M_X(a)$ is multivalued on a dense subset of . It is proved that $K^0$ is a residual dense subset of K().
Źródło:
Studia Mathematica; 1994-1995, 112, 2; 99-107
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on the effect of active pyrite on flotation of porphyry copper ores
Autorzy:
Molaei, N.
Hoseinian, F. S.
Rezai, B.
Powiązania:
https://bibliotekanauki.pl/articles/109515.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flotation
optimization
collector
chalcopyrite
active pyrite
Opis:
Active pyrite is one of the most undesirable phenomena in the flotation of porphyry copper ores. Misreported pyrite into copper concentrates decreased the grade and recovery of copper. In this study, the effective parameters on the flotation process including grinding condition and chemical parameters were evaluated in order to decrease the active pyrite recovery by flotation. Firstly, optical microscopic and grinding studies were carried out to determine the optimal particle size and grinding time. The results showed that 43 minutes of grinding is necessary to achieve the optimum liberation degree of 53 µm for flotation. Then, the flotation effective parameters such as pH (7.3, 10, 10.5, 11, 11.5 and 12), collector type (Nascol, Aero 407, Aero 3477 and X231), collector concentration (12 and 25 mg/dm3), depressant concentration (0 and 25 mg/dm3) and frother concentration (0 and 25 mg/dm3) were investigated in a Denver-type laboratory flotation cell with a constant capacity of 2.5 dm3. The results showed that the optimal conditions for chalcopyrite flotation were pH of 11.5, Aero 407 as a collector with concentration of 25 mg/dm3, Dowfroth 250 (DF250) as a frother with concentration of 25 mg/dm3 and Na2SO3 as a depressant with concentration of 25 mg/dm3. The type of collector had greater effect on the chalcopyrite flotation than the other parameters. The recovery and grade of chalcopyrite and pyrite were obtained as 79.95%, 49% and 5.3%, 7.98% using the Aero 407, respectively. Under the optimum conditions, the grade of final concentrate increased from 0.94% to 21.3% with three cleaner stages.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 3; 922-933
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamically-adaptive Weight in Batch Back Propagation Algorithm via Dynamic Training Rate for Speedup and Accuracy Training
Autorzy:
Al_Duais, M. S.
Mohamad, F. S.
Powiązania:
https://bibliotekanauki.pl/articles/307920.pdf
Data publikacji:
2017
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
artificial neural network (ANN)
batch back propagation algorithm
dynamic training rate
speed up training
accuracy training
Opis:
The main problem of batch back propagation (BBP) algorithm is slow training and there are several parameters need to be adjusted manually, such as learning rate. In addition, the BBP algorithm suffers from saturation training. The objective of this study is to improve the speed up training of the BBP algorithm and to remove the saturation training. The training rate is the most significant parameter for increasing the efficiency of the BBP. In this study, a new dynamic training rate is created to speed the training of the BBP algorithm. The dynamic batch back propagation (DBBPLR) algorithm is presented, which trains with adynamic training rate. This technique was implemented with a sigmoid function. Several data sets were used as benchmarks for testing the effects of the created dynamic training rate that we created. All the experiments were performed on Matlab. From the experimental results, the DBBPLR algorithm provides superior performance in terms of training, faster training with higher accuracy compared to the BBP algorithm and existing works.
Źródło:
Journal of Telecommunications and Information Technology; 2017, 4; 82-89
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1144

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