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Wyświetlanie 1-15 z 165
Tytuł:
Efektywność agregacji nanocząstek amorficznej krzemionki
Aggregation efficiency of amorphous silica nanoparticles
Autorzy:
Tyl, G.
Bałdyga, J.
Bouaifi, M.
Powiązania:
https://bibliotekanauki.pl/articles/2073341.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
rdzeń agregacji
efektywność agregacji
prawdopodobieństwo agregacji
nanocząstki krzemionki
aggregation kemel
aggregation efficiency
probability of aggregation
silica nanoparticles
Opis:
Przedstawiono wyrażenie na efektywność zderzeń bazujące na analizie charakterystycznych skal czasowych procesu agregacji nanocząstek krzemionki. Pozwala to na wytłumaczenie istnienia obszaru metastabilnego dla koloidalnej krzemionki oraz powolnego żelowania w tym obszarze, mimo bliskości punktu izoelektrycznego. Zaproponowany opis matematyczny może być wykorzystany do wyznaczenia szybkości agregacji cząstek krzemionki koloidalnej w zależności od parametrów procesowych oraz charakterystycznych właściwości populacji cząstek.
In this work expression for the collision efficiency was proposed based on the analysis of characteristic time scales of the aggregation process of silica nanoparticles. It allows us to ехріаіп the existence of metastable region of the colloidal silica and slow gelation in that region regardless of the vicinity of isoelectric point. The developed expression can be further used to determine the aggregation rate depending on the process parameters and characteristic properties of considered population of particles when used together with suitable collision kemel.
Źródło:
Inżynieria i Aparatura Chemiczna; 2018, 3; 81--83
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methodological aspects of the quantification of dispersible clay and its relationship with soil properties along a catena under no-till management
Autorzy:
de Paula, A.L.
Giarola, N.F.B.
de Lima, R.P.
Wiecheteck, L.H.
da Silva, A.P.
Powiązania:
https://bibliotekanauki.pl/articles/2082881.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
soil structure
erodibility
aggregation
Opis:
Continuous no-till management of sloping cultivated areas can promote soil property transformations, causing changes in aggregation and dispersion. The objective of this work was (i) to quantify the readily and mechanically dispersible clays using different methods and (ii) to examine their relationships with soil properties along a catena under no-till management. For this study, the catena was divided into three distinct parts: crest, upper-slope and mid-slope positions. Undisturbed soil cores were sampled at each slope position to determine the following soil properties: organic carbon, Ca2+, Mg2+, K+, Al3+, P, pH, cation exchange capacity and total clay content. Additionally, the levels of readily dispersible clay were measured using turbidimeter and hydrometer methods, whereas mechanically dispersible clay was quantified using the turbidimeter method. We observed high influence of total clay content and organic carbon on soil flocculation; P, Mg2+ and cation exchange capacity were positively related to clay dispersion. Soil management and water transport downslope are probably influencing changes in soil properties and determining the distribution of dispersible clay contents along the catena. No relationships were observed between readily dispersible clay measured using turbidimeter and hydrometer in terms of quantity. Hydrometer and turbidimeter measurements can deliver significantly different results regarding dispersible clay quantification, potentially leading to misinterpretations concerning the amount of clay dispersed in water.
Źródło:
International Agrophysics; 2020, 34, 2; 273-280
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integer Matrix Keys for Secure Data Aggregation in Clustered Wireless Sensor Networks
Autorzy:
Chethana, G.
Padmaja, K.V.
Powiązania:
https://bibliotekanauki.pl/articles/1844481.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
loss-less data aggregation
integer matrices as keys
finite field Zp
homomorphic aggregation
Opis:
Providing Privacy and security for aggregated data in wireless sensor networks has drawn the attention of practicing engineers and researchers globally. Several cryptographic methods have been already proposed to solve security and data integrity problems for aggregated data. Matrix cryptography is a better option for creating secure encryption/decryption algorithms to counter quantum attack. However, these algorithms have higher computational cost and increased communication overhead. Hence, a new technique of loss-less secure data aggregation in Clustered Wireless Sensor Networks is presented. The proposed method uses integer matrices as keys for data security and data integrity. Matrix operations are carried out in finite field Zp. Loss-less secure data aggregation is extended for homomorphic summation while the cipher text expansion ratio is kept substantially low. The proposed algorithm has inbuilt fast and efficient signature verification facility. The execution time of our signature verification mechanism is found to be approximately 50 percent less compared to a couple of standard existing signature verification schemes.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 4; 637-645
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multivalued coherent risk measures
Wielowartościowe koherentne miary ryzyka
Autorzy:
Trzpiot, Grażyna
Powiązania:
https://bibliotekanauki.pl/articles/905686.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Coherent risk measures
risk aggregation
Opis:
The concept of coherent risk measures with its axiomatic characterization was discussed in a finite probability spaces. The aim of this paper is to apply a multivalued random variable as a multivalued risk measures, for description the risk of portfolio. This is a study related to aggregation problem. We study to alternative methods of aggregation: coherent aggregation of random portfolios and coherent aggregation of risk.
Koncepcja koherentnych miar ryzyka wraz z układem aksjomatów jest dyskutowana w skończonej przestrzeni probabilistycznej. Celem artykułu jest wykorzystanie wielowartościowych zmiennych losowych jako wielowartościowych miar ryzyka do opisu ryzyka portfela aktywów finansowych. Jest to problem agregacji informacji. Rozważamy dwa podejścia: koherentna agregacja losowych stop zwrotu z portfeli oraz koherentna agregacja ryzyka.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2008, 216
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Random Selection of Variables for Aggregated Tree-Based Models
Zastosowanie losowego doboru zmiennych w agregacji drzew klasyfikacyjnych
Autorzy:
Gatnar, Eugeniusz
Rozmus, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/905698.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Tree-based models
aggregation
RandomForest
Opis:
Tree-based models are popular a widely used because they are simple, flexible and powerful tools for classification. Unfortunately they are not stable classifiers. Significant improvement of the model stability and prediction accuracy can be obtained by aggregation of multiple classification trees. Proposed methods, i.e. bagging, adaptive bagging, and arcing are based on sampling cases from the training set while boosting uses a system of weights for cases. The result is called committee of trees, an ensemble or a forest. Recent developments in this field showed that randomization (random selection of variables) in aggregated tree-based classifiers leads to consistent models while boosting can overfit. In this paper we discuss optimal parameter values for the method of random selection of variables (RandomForest) for an aggregated tree-based model (i.e. number of trees in the forest and number of variables selected for each split).
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2006, 196
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhanced effect of fine magnetite on the flotation performance of fine hematite in sodium oleate system
Autorzy:
Pei, Bin
Luo, Ximei
Yang, Wen
Wei, Dayong
Li, Chao
Wang, Yunfan
Powiązania:
https://bibliotekanauki.pl/articles/2146908.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
magnetite
hematite
flotation
magnetic aggregation
Opis:
In this work, the effect of magnetite with different particle sizes on the flotation performance of both coarse and fine hematite particles were investigated by using sodium oleate as a collector. The results showed that the magnetite particles with different particle sizes showed a negative effect on hematite (-106+45 μm) recovery, but the addition of magnetite with the same particle sizes as hematite during the direct flotation of -45 μm hematite was beneficial to improve the recovery of micro-fine hematite and the Fe grade of concentrate. The finer the magnetite particle was, the more obvious the agglomeration effect of hematite was. Therefore, the beneficial effect could be achieved by adjusting the particle sizes of particles. Moreover, sodium oleate was beneficial to promote the agglomeration of micro-fine magnetite and hematite. The results from the microscopic analysis, laser particle size analysis, and EDLVO calculation proved that there was an effective aggregation between fine magnetite and fine hematite particles, which increased the apparent size of hematite particles and the probability of the mineral particles adhering to bubbles, thus improving the hematite recovery.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 149673
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of data aggregation methods and related issues in Wireless Sensor Networks
Autorzy:
Nels, S. Ninisha
Singh, J. Amar Pratap
Powiązania:
https://bibliotekanauki.pl/articles/2050167.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
data aggregation
wireless sensor network
WSN
clustering
cluster head
CH
cluster-based data aggregation
Opis:
Data aggregation is the process aimed at reducing the transmission count of packets being transmitted in the framework of in-network data processing. It is the data transmission model that takes the information transmitted from different nodes and generates a single data packet after finding and eliminating the redundant packets. Accordingly, this process decreases the transmission count and makes it possible to consume less energy. The major issues in data aggregation mechanism are related to reduction of latency and to energy balancing. Moreover, it is very complex to resolve the issue of packet loss, which is the failure of one or more transmitted packets to arrive at their destination due to the bad and/or congested channel conditions. The present survey involves a collection of 50 research papers dealing with the data aggregation models in wireless sensor networks (WSN). Various data aggregation methods, like the cluster-based approach, structure-free method, tree-based approach, in-network methods, and energy based aggregation model are considered in this survey, regarding the application and the energy usage involved. On the basis of the survey, the issues and drawbacks faced by the respective methodologies are highlighted. In addition, the paper presents simple statistics of the studies considered with respect to the performance measures, simulation tools, publication year, and classification of methods. The future dimensions of the respective research are supposed to be based on the challenges identified in this survey.
Źródło:
Control and Cybernetics; 2020, 49, 4; 419-446
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generation of stable, non-aggregating Saccharomyces cerevisiae wild isolates
Autorzy:
Wloch-Salamon, Dominika
Plech, Marcin
Majewska, Jagoda
Powiązania:
https://bibliotekanauki.pl/articles/1039461.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
AMN1
aggregation
Saccharomyces cerevisiae
Opis:
Cellular aggregates observed during growth of Saccharomyces cerevisiae strains derived from various natural environments makes most laboratory techniques optimized for non-aggregating laboratory strains inappropriate. We describe a method to reduce the size and percentage of the aggregates. This is achieved by replacing the native allele of the AMN1 gene with an allele found in the W303 laboratory strain. The reduction in aggregates is consistent across various environments and generations, with no change in maximum population density or strain viability, and only minor changes in maximum growth rate and colony morphology.
Źródło:
Acta Biochimica Polonica; 2013, 60, 4; 657-660
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The channel for hidden data transmission in WSN
Autorzy:
Schoeneich, R. O.
Golański, M.
Kucharski, M.
Franciszkiewicz, M.
Zgid, D.
Powiązania:
https://bibliotekanauki.pl/articles/226093.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aggregation
message hidding
MANET
WSN
Opis:
This paper describes an idea and realisation of hidden data transmision using Tiny Aggregation Covert Channel (TAGCC) in Wireless Sensor Networks. Our solution uses data aggregation mechanism called Tiny Aggregation (TAG). The protocol is based on idea of hidden messages sending without generate additional data packets and encryption. The paper describes details of proposed algorithm and simulation results obtained during testing of the sensor networks with hidden channel TAGCC.
Źródło:
International Journal of Electronics and Telecommunications; 2017, 63, 2; 209-216
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Algorithm for the Transportation Network Nodes Aggregation Using Fuzzy Logic
Autorzy:
Król, Aleksander
Powiązania:
https://bibliotekanauki.pl/articles/504606.pdf
Data publikacji:
2015
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Tematy:
transportation network
nodes aggregation
fuzzy logic
Opis:
In many situations, the model of the transportation network contains a very large number of nodes, so the algorithms operating on such a model may be too time-consuming. Therefore there is a need to simplify the model by reducing the number of nodes. The simplest approach using the physical neighbourhood of the nodes and then aggregation of nearby nodes may be insufficient, because it does not take into account the different roles played by the nodes subject to the merger. Some of them have local significance and can be aggregated without disturbing the traffic flows across the whole network. For other nodes traffic flows associated with geographically distant nodes can be much larger than the local flows. Nodes of this kind should not be aggregated with their neighbours. This paper presents an algorithm for grouping the transportation network nodes using fuzzy logic, which processes the qualitative characteristics of nodes.
Źródło:
Logistics and Transport; 2015, 26, 2; 67-74
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust distributed privacy-preserving secure aggregation in vehicular communication
Autorzy:
Qin, B.
Wu, Q.
Domingo-Ferrer, J.
Susilo, W.
Powiązania:
https://bibliotekanauki.pl/articles/206240.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
authentication
vehicle privacy
data aggregation
VANETs
Opis:
Vehicular ad hoc networks (VANETs), formed by computers embedded in vehicles and the traffic infrastructure, are expected to develop in the near future to improve traffic safety and efficiency. To this end, VANETs should be designed to be resistant against various abuses and attacks. In this paper, we first review the existing proposals to provide security, privacy, and data aggregation in vehicle-to-vehicle communication. We then address the fundamental issue of achieving these conflicting properties in a unified solution, having observed that separate efforts cannot fulfill the VANET design objectives. A set of new mechanisms are suggested for efficiently managing identities and securely compressing cryptographic witnesses, which are among the major obstacles to the deployment of strong security mechanisms in VANETs. Finally, we employ the standard threshold cryptographic technology to improve the basic protocol with robustness.
Źródło:
Control and Cybernetics; 2012, 41, 2; 277-296
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Escherichia coli small heat shock proteins IbpA/B enhance activity of enzymes sequestered in inclusion bodies.
Autorzy:
Kuczyńska-Wiśnik, Dorota
Żurawa-Janicka, Dorota
Narkiewicz, Joanna
Kwiatkowska, Joanna
Lipińska, Barbara
Laskowska, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/1041504.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
protein aggregation
inclusion bodies
IbpA/B
Opis:
Escherichia coli small heat shock proteins, IbpA/B, function as molecular chaperones and protect misfolded proteins against irreversible aggregation. IbpA/B are induced during overproduction of recombinant proteins and bind to inclusion bodies in E. coli cells. We investigated the effect of ΔibpA/B mutation on formation of inclusion bodies and biological activity of enzymes sequestered in the aggregates in E. coli cells. Using three different recombinant proteins: Cro-β-galactosidase, β-lactamase and rat rHtrA1 we demonstrated that deletion of the ibpA/B operon did not affect the level of produced inclusion bodies. However, in aggregates containing IbpA/B a higher enzymatic activity was detected than in the IbpA/B-deficient inclusion bodies. These results confirm that IbpA/B protect misfolded proteins from inactivation in vivo.
Źródło:
Acta Biochimica Polonica; 2004, 51, 4; 925-931
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of divalent metal ions on annexin-mediated aggregation of asolectin liposomes.
Autorzy:
Mel'gunov, Vladimir
Akimova, Elena
Krasavchenko, Kirill
Powiązania:
https://bibliotekanauki.pl/articles/1044309.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
aggregation
liposome
annexin
divalent metal ions
Opis:
Annexins belong to a family of Ca2+- and phospholipid-binding proteins that can mediate the aggregation of granules and vesicles in the presence of Ca2+. We have studied the effects of different divalent metal ions on annexin-mediated aggregation of liposomes using annexins isolated from rabbit liver and large unilamellar vesicles prepared from soybean asolectin II-S. In the course of these studies, we have found that annexin-mediated aggregation of liposomes can be driven by various earth and transition metal ions other than Ca2+. The ability of metal ions to induce annexin-mediated aggregation decreases in the order: Cd2+>Ba2+, Sr2+>Ca2+>>Mn2+>Ni2+>>Co2+. Annexin-mediated aggregation of vesicles is more selective to metal ions than the binding of annexins to membranes. We speculate that not every type of divalent metal ion can induce conformational change sufficient to promote the interaction of annexins either with two opposing membranes or with opposing protein molecules. Relative concentration ratios of metal ions in the intimate environment may be crucial for the functioning of annexins within specialized tissues and after treatment with toxic metal ions.
Źródło:
Acta Biochimica Polonica; 2000, 47, 3; 675-683
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parasites community of Astronotus crassipinnis (Cichlidae), a fish from the Brazilian Amazon
Autorzy:
Santos, G.G.
Oliveira, M.S.B.
Neves, L.R.
Tavares-Dias, M.
Powiązania:
https://bibliotekanauki.pl/articles/972319.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
aggregation
parasites
Amazon
Astronotus crassipinnis
Cichlidae
Opis:
We provide the first study on the diversity and community of parasites in Astronotus crassipinnis from the lower Amazon River, in Brazil. Of 35 hosts examined, 100% were infected with one or more species of parasites, such as Gussevia asota, Gussevia astronoti, Gussevia rogersi, Posthodiplostomum sp., Contracaecum sp., Gorytocephalus sp. and Dolops longicauda. Gussevia asota, G. astronoti and G. rogersi were dominant, and, in total, 9788 parasites were collected. The richness of parasite species (4.9±0.7), Brillouin diversity (0.46±0.28) and evenness (0.29±0.17) were low. Parasites had aggregated dispersion, parasitism did not affect the host condition factor, and host size did not influence abundance, species richness and parasite diversity. The parasitic fauna was characterized by the presence of few species of parasites with high prevalence and low abundance, specifically the endoparasites, besides dominance of ectoparasites. The presence of endoparasites indicates that the diet of A. crassipinnis consists mostly of mollusks and microcrustaceans. This fish species is an intermediate host for Posthodiplostomum sp., Contracaecum sp. and Gorytocephalus sp., parasites found in larval stage. Finally, the behavior and availability of infective stages, which are intermediate hosts for endoparasites, were factors structuring the communities of endoparasites.
Źródło:
Annals of Parasitology; 2018, 64, 2; 121-128
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model for Balancing Aggregated Communication Bandwidth Resources
Autorzy:
Pałka, P.
Kołtyś, K.
Toczyłowski, E.
Żółtowska, I.
Powiązania:
https://bibliotekanauki.pl/articles/309024.pdf
Data publikacji:
2009
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
aggregation
auctions
bandwidth market
multicommodity trade
Opis:
In this paper we present a multicommodity bandwidth exchange model for balancing aggregated communication bandwidth resources (BACBR) that allows us to aggregate similar offers. In this model offers submitted to sell (or buy) the same, similar, or equivalent network resources (or demands for end-to-end connections) are aggregated into single commodities. BACBR model is based on the balancing communication bandwidth trade (BCBT) model. It requires much less variables and constraints then original BCBT, however the outcomes need to be disaggregated. The general model for disaggregation is also given in the paper.
Źródło:
Journal of Telecommunications and Information Technology; 2009, 3; 43-49
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
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