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Wyświetlanie 1-15 z 1608
Tytuł:
The discrete busy period distribution for various single server queues
Dyskretny rozkład okresów pracy różnych jednokanałowych systemów obsługi masowej
Распределения дискретных периодов непрерывной работы разных систем массового обслуживания с одним каналом обслуживания
Autorzy:
Haight, F. A.
Powiązania:
https://bibliotekanauki.pl/articles/741312.pdf
Data publikacji:
1965
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Applicationes Mathematicae; 1965, 8, 1; 37-46
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The characterization of discrete distributions by conditional distributions
Charakteryzacja rozkładów dyskretnych poprzez rozkłady warunkowe
Autorzy:
Haight, F. A.
Powiązania:
https://bibliotekanauki.pl/articles/740692.pdf
Data publikacji:
1972
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Applicationes Mathematicae; 1972-1973, 13, 2; 207-213
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exploit relations between the word letters and their placement in the word for Arabic root extraction
Autorzy:
Hawas, F. A.
Powiązania:
https://bibliotekanauki.pl/articles/305644.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
rule-based stemmer
word root
suffixes
prefixes
words patterns
Opis:
This paper presents a new root-extraction approach for Arabic words. The approach tries to assign for Arabic words a unique root without relying on a database of word roots, a list of word patterns or a list of all the prefixes and the suffixes of the Arabic words. Unlike most of Arabic rule-based stemmers, it tries to predict the root-letters positions one by one based on some rules and relations among the word letters and their placement in the word. This paper focuses on two parts of the approach. The first one introduces some rules to distinguish between the Arabic definite article and the permanent component that may found in any Arabic word. The second one classifies Arabic letters in to groups according to their positions in the word. The proposed approach is a system composed of several modules used to extract the word root. The approach has been evaluated using the Holy Quran words. The evaluation results show a promising root extraction algorithm.
Źródło:
Computer Science; 2013, 14 (2); 327-341
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Notes on the nonlinear dependence of a multiscale coupled system with respect to the interface
Autorzy:
Morales, F. A.
Powiązania:
https://bibliotekanauki.pl/articles/255380.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
multiscale coupled systems
interface geometric perturbations
variational formulations
nonlinear dependence
Opis:
This work studies the dependence of the solution with respect to interface geometric perturbations, in a multiscaled coupled Darcy flow system in direct variational formulation. A set of admissible perturbation functions and a sense of convergence is presented, as well as sufficient conditions on the forcing terms, in order to conclude strong convergence statements. For the rate of convergence of the solutions we start solving completely the one dimensional case, using orthogonal decompositions on the appropriate subspaces. Finally, the rate of convergence question is analyzed in a simple multi dimensional setting, by studying the nonlinear operators introduced due to the geometric perturbations.
Źródło:
Opuscula Mathematica; 2015, 35, 4; 517-546
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On a method of ordering and clustering of objects
O pewnej metodzie porządkowania i grupowania obiektów
Autorzy:
Szczotka, F. A.
Powiązania:
https://bibliotekanauki.pl/articles/741928.pdf
Data publikacji:
1972
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Applicationes Mathematicae; 1972-1973, 13, 1; 23-34
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
P2P video streaming combining SVC and MDC
Autorzy:
López-Fuentes, F. A.
Powiązania:
https://bibliotekanauki.pl/articles/907783.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
sieć równorzędna
strumieniowanie wideo
kodowanie wideo
kodowanie skalowalne
peer-to-peer networks
video streaming
scalable video coding
multiple description video coding
Opis:
In this paper we propose and evaluate a combined SVC-MDC (Scalable Video Coding & Multiple Description Video Coding) video coding scheme for Peer-to-Peer (P2P) video multicast. The proposed scheme is based on a full cooperation established between the peer sites, which contribute their upload capacity during video distribution. The source site splits the video content into many small blocks and assigns each block to a single peer for redistribution. Our solution is implemented in a fully meshed P2P network in which peers are connected to each other via UDP (User Datagram Protocol) links. The video content is encoded by using the Scalable Video Coding (SVC) method. We present a flow control mechanism that allows us to optimize dynamically the overall throughput and to automatically adjust video quality for each peer. Thus, peers with different upload capacity receive different video quality. We also combine the SVC method with Multiple Description Coding (MDC) to alleviate the packet loss problem. We implemented and tested this approach in the PlanetLab infrastructure. The obtained results show that our solution achieves good performance and remarkable video quality in the presence of packet loss.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2011, 21, 2; 295-306
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phylogenetic relationships and time-calibration of the South American fossil and extant species of southern beeches (Nothofagus)
Autorzy:
Vento, B.
Agrain, F.A.
Powiązania:
https://bibliotekanauki.pl/articles/20458.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
The genus Nothofagus is considered as one of the most interesting plant genera, not only for the living species but also due to the fossil evidence distributed throughout the Southern Hemisphere. Early publications postulated a close relationship between fossil and living species of Nothofagus. However, the intrageneric phylogenetic relationships are not yet fully explored. This work assesses the placement of fossil representatives of genus Nothofagus, using different search strategies (Equal Weight and Implied Weight), and it analyses relationships with the extant species from South America (Argentina and Chile). The relationships of fossil taxa with the monophyletic subgenera Brassospora, Fuscospora, Lophozonia, and Nothofagus and the monophyly of the clades corresponding to the four subgenera are tested. A timecalibrated tree is generated in an approach aiming at estimating the divergence times of all the major lineages. The results support the inclusion of most fossil taxa from South America into the subgenera of Nothofagus. The strict consensus tree shows the following species as closely related: Nothofagus elongata + N. alpina; N. variabilis + N. pumilio; N. suberruginea + N. alessandri; N. serrulata + N. dombeyi, and N. crenulata + N. betuloides. The species N. simplicidens shares a common ancestor with N. pumilio, N. crenulata, and N. betuloides. This contribution is one of the first attempts to integrate fossil and extant Nothofagus species from South America into a phylogenetic analysis and an approach for a time-calibrated tree.
Źródło:
Acta Palaeontologica Polonica; 2018, 63, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Refinery Firefighters: Assessing Fitness for Duty
Autorzy:
Fogleman, M.
Bhojani, F. A.
Powiązania:
https://bibliotekanauki.pl/articles/89911.pdf
Data publikacji:
2005
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
firefighters
fitness for duty
niebezpieczeństwo pożaru
miejsce zagrożone wybuchem
straż pożarna
rafinacja ropy naftowej
badanie zdrowia zawodowego
zdolność do pracy
strażak
Opis:
Firefighting is a hazardous and physically demanding activity. The demanding nature of the tasks involved in firefighting requires a high level of fitness both for the safety of the firefighting personnel as well as for the adequate performance of their tasks. Here, the characteristics (body weight, lung function, etc.) of a small group of refinery firefighters were investigated using exploratory factor analysis and discriminant analysis. The results indicated that there is a group of factors that characterize those individuals meeting minimum fitness requirements as described previously in the literature. The factors that were identified included those related to anthropometry (such as body composition and weight) and those related to physical capabilities (such as push-ups). Since these data are collected relatively easily in most occupational settings, they may offer an efficient surrogate method to determine fitness for duty among firefighters.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2005, 11, 2; 161-170
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effects of different doses of nitrogen on tomato plant mineral contents under boron toxicity
Autorzy:
Gündeş, F.A.
Sönmez, I.
Powiązania:
https://bibliotekanauki.pl/articles/12707509.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Opis:
The effect of different nitrogen (N) treatments on the nutrient contents of tomato (Lycopersicon esculentum Mill., cv. ‘Tayfun F1’) under different boron (B) concentrations were investigated in greenhouse conditions with four replications. Four different levels of B (0, 5, 10 and 20 mg kg⁻¹) and three levels of N (100, 200, 300 mg kg⁻¹) were used in this research. The results showed that tomato plant growth was negatively affected with increasing B concentrations and symptoms of boron toxicity were observed. The tomato leaf nutrient concentrations were increased in all plants with B and N treatments and 20 mg kg⁻¹ B and 300 mg kg⁻¹ N treatments were determined to be more effective compared to the others. 20 mg kg⁻¹ B and 100 mg kg⁻¹ N treatment caused the highest micro element concentrations of tomato leaf. This could be interpreted as N application having a dilution effect to be able to maintain development under conditions of toxicity of B. The plants growth under boron toxicity conditions showed increased vegetation with increasing N applications which was attributed to the dilution effect.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2020, 19, 2; 97-104
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plants that heal wounds. A review
Rośliny o działaniu gojącym
Autorzy:
Pawar, R.S.
Toppo, F.A.
Powiązania:
https://bibliotekanauki.pl/articles/71503.pdf
Data publikacji:
2012
Wydawca:
Instytut Włókien Naturalnych i Roślin Zielarskich
Opis:
Plants have traditionally been used as a source of medicine in India by indigenous people of different ethnic groups inhabiting various terrains for the control of various ailments afflicting human and their domestic animals. Recently, focus on plant research has increased all over the world and a large body of evidence has collected to show immense potential of medicinal plants used in various traditional systems. More than 13,000 plants have been studied during last 5 years. Our review aims to compile data generated through the research activity using modern scientific approaches and innovative scientific tools in last few years. This article represent wound healing activity of various plants found and used traditionally. We have made an attempt to give an insight into different plants of potential wound healing properties which could be beneficial in therapeutic practice.
Ludność z grup etnicznych zamieszkujących różne rejony Indii tradycyjnie używa roślin do leczenia wielu dolegliwości u ludzi i zwierząt domowych. Ostatnio na świecie odnotowuje się zwiększone zainteresowanie lekami pochodzenia roślinnego. Zebrano wiele dowodów na ogromne możliwości roślin leczniczych używanych tradycyjnie w wielu społecznościach. W ciągu ostatnich pięciu lat przestudiowano ponad 13 000 gatunków. Nasz przegląd to próba porównania danych uzyskanych w trakcie badań w ciągu ostatnich kilku lat przy użyciu nowoczesnego podejścia i innowacyjnych narzędzi badawczych. Artykuł dotyczy roślin używanych tradycyjnie na gojenie ran. Podjęto próbę przeglądu roślin o właściwościach gojących, które mogłyby być z powodzeniem stosowane w praktyce leczniczej.
Źródło:
Herba Polonica; 2012, 58, 1
0018-0599
Pojawia się w:
Herba Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of the sea squirt Ecteinascidia thurstoni Herdman, 1890 (Ascidiacea: Perophoridae) along Suez Canal and Egyptian Red Sea coasts
Autorzy:
Gab-Alla, A.A.-F.A.
Powiązania:
https://bibliotekanauki.pl/articles/47709.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
sea squirt
sea coast
Perophoridae
Suez Canal
seasonal rhythm
Red Sea
Ascidiacea
distribution
Ecteinascidia thurstoni
Opis:
Ecteinascidia thurstoni is a colonial sea squirt. It has a seasonal rhythm and a tropical and subtropical distribution; it is usually present during the summer months. It synthesizes a group of molecules called ecteinascidins. One of these is ET-743, a compound that has a most original anti-tumoral activity and is today considered to be one of the most promising substances effective against various solid-type tumors (currently sold under the trade name of Yondelis for the treatment of sarcomas and related tumors; it is undergoing phase II/III clinical trails for other kinds of tumors). Worldwide, Ecteinascidia species represent the only available source of this bioactive compound, which was first discovered in E. turbinata. During the present study, the ecology of E. thurstoni along the Suez Canal and Red Sea was investigated. Its populations were observed to be highly gregarious due in part to their low larval dispersal, which is very localized; larvae therefore tend to settle close to their parent colonies. It is only recorded in shallow waters (0.5–1.5 m) as an epiphyte on the pneumatophores of mangroves by the Red Sea, on the pilings of jetties, and the metal or cement banks of the Suez Canal. The morphometric characteristics (zooid length, zooid weight, colony weight) of the Suez Canal population differ significantly from those of the Red Sea. Studying the distribution of this species and locating its different populations along the Suez Canal and Red Sea could help to characterize their genetics, chemistry and bacterial communities at different isolated locations. Ultimately, this will help to define the sources of ET-743 and hence promote its biosynthesis on a commercial scale.
Źródło:
Oceanologia; 2008, 50, 2; 239-253
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1608

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