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Wyświetlanie 1-100 z 1883
Tytuł:
Obchód ustalenia granic wschodnich Rzeczypospolitej : Kalisz
Autorzy:
F.A.
Powiązania:
Polska Zbrojna 1923, nr 86, s. 4
Data publikacji:
1923
Tematy:
Rada Ambasadorów marzec 1923 r.
Kalisz (garnizon) uroczystości marzec 1923 r.
Granice Polska marzec 1923 r.
Opis:
21-22 III, garnizon Kalisz -- capstrzyk odegrany przez orkiestry (29 pułku strzelców kaniowskich, policji i straży ogniowej), msza polowa, defilada.
Dostawca treści:
Bibliografia CBW
Artykuł
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:
Aproksymacja rozkładów pierśnic drzew w dwugeneracyjnych drzewostanach za pomocą rozkładów mieszanych. III. Estymatory jądrowe a rozkłady mieszane
Approximation of the breast height diameter distribution of two-cohort stands by mixture models. III. Kernel density estimators vs mixture models
Autorzy:
Podlaski, R.
Roesch, F.A.
Powiązania:
https://bibliotekanauki.pl/articles/990995.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewostany dwupokoleniowe
rozklad piersnic
aproksymacja
rozklad mieszany
rozklad Weibulla
estymatory jadrowe nieparametryczne
two−component models
kernel density estimator
tree diameter distribution
monte carlo simulation
Opis:
Two−component mixtures of either the Weibull distribution or the gamma distribution and the kernel density estimator were used for describing the diameter at breast height (dbh) empirical distributions of two−cohort stands. The data consisted of study plots from the Świętokrzyski National Park (central Poland) and areas close to and including the North Carolina section of the Great Smoky Mountains National Park (USA; southern Appalachians). Kernel density estimators belong to a class of nonparametric density estimators. Nonparametric estimators have no fixed structure and depend upon all the data points to reach an estimate. In this study the Weibull and the gamma mixture distributions were the most versatile models. The results also support the conclusion that there are only minor differences between the parametric models and the kernel density estimates.
Źródło:
Sylwan; 2014, 158, 06; 414-422
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aproksymacja rozkładów pierśnic drzew w drzewostanach dwugeneracyjnych za pomocą rozkładów mieszanych. II. Testy zgodności
Approximation of the breast height diameter distribution of two-cohort stands by mixture models. II. Goodness-of-fit tests
Autorzy:
Podlaski, R.
Roesch, F.A.
Powiązania:
https://bibliotekanauki.pl/articles/993354.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewostany dwupokoleniowe
rozklad piersnic
aproksymacja
rozklad mieszany
testy zgodnosci
two−component mixtures
tree diameter distribution
nonparametric goodness−of−fit tests
discrete null distribution
Opis:
The goals of this study are (1) to analyse the accuracy of the approximation of empirical distributions of diameter at breast height (dbh) using two−component mixtures of either the Weibull distribution or the gamma distribution in two−cohort stands, and (2) to discuss the procedure of choosing goodness−of−fit tests. The study plots were located in the Świętokrzyski National Park (central Poland) and in the Southern Appalachian Mountains (eastern USA). The results of the goodness−of−fit tests (chi−squared, Kolmogorov−Smirnov, Cramér−von Mises, and Anderson−Darling), normalised bias and normalised root mean square error, indicate that dbh empirical distributions of two−cohort stands are compatible with the mixture models investigated. The chi−squared test and the generalization of the Anderson−Darling test to discrete distributions should be used to assess whether empirical dbh data are consistent with a hypothesized null distribution.
Źródło:
Sylwan; 2013, 157, 09; 652-661
0039-7660
Pojawia się w:
Sylwan
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:
Aproksymacja rozkładów pierśnic w dwugeneracyjnych drzewostanach za pomocą rozkładów mieszanych. I. Estymacja parametrów
Approximation of the breast height diameter distribution of two-cohort stands by mixture models. I. Parameter estimation
Autorzy:
Podlaski, R.
Roesch, F.A.
Powiązania:
https://bibliotekanauki.pl/articles/994450.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewostany dwupokoleniowe
rozklad piersnic
aproksymacja
rozklad mieszany
estymacja parametrow
two−component mixtures
tree diameter distribution
weibull distribution
gamma distribution
starting strategy
Opis:
Study assessed the usefulness of various methods for choosing the initial values for the numerical procedures for estimating the parameters of mixture distributions and analysed variety of mixture models to approximate empirical diameter at breast height (dbh) distributions. Two−component mixtures of either the Weibull distribution or the gamma distribution were employed. The study plots, representing two−cohort stands, were located in the Świętokrzyski National Park (central Poland) and in the Southern Appalachian Mountains (eastern USA). A new strategy using three methods for choosing initial values (min.k/max.k for k=1, 5, 10; 0,5/1,5/mean; wp) for maximizing the likelihood during parameter estimation for mixture models for small and large plots is proposed.
Źródło:
Sylwan; 2013, 157, 08; 587-596
0039-7660
Pojawia się w:
Sylwan
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
Tytuł:
Characteristics of Measured Rainfall Rate at Ogbomoso, Nigeria for Microwave Applications
Autorzy:
Semire, F. A.
Raji, T. I.
Powiązania:
https://bibliotekanauki.pl/articles/309068.pdf
Data publikacji:
2011
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
characteristics
Ogbomoso
rainfall
Opis:
Characteristics of rainfall rate useful in the estimation of attenuation due to rain are presented. Rain data collected at Ogbomoso between January-October, 2009 were used in the analysis. Result shows that power law relationship exists between the equiprobable rain rates of two different integration times. The value of conversion factor CE and CR obtained for Ogbomoso are 0.28(60) and 0.64(90) respectively. Our result then shows that different conversion factor is required for different location even within the same climatic region.
Źródło:
Journal of Telecommunications and Information Technology; 2011, 2; 85-89
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biological protection of vegetable crops as an element of agrophytocenoses ecologization
Biologiczna ochrona upraw warzywnych jako element ekologizacji agrocenoz
Autorzy:
Vaga, I. I.
Popov, F. A.
Powiązania:
https://bibliotekanauki.pl/articles/336744.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Tematy:
food products
biopesticides
biostimulator
disease resistance
phytosanitary monitoring
agrocenosis optimization
agriculture ecologization
artykuły spożywcze
biopestycydy
biostymulator
odporność na choroby
kontrola fitosanitarna
optymalizacja agrocenozy
ekologizacja rolnictwa
Opis:
In the publication the role of products for biological plant protection against noxious organisms is shown in structure formation and vegetable crops agrophytocenoses stabilization, their quantitative and qualitative composition. It is pointed out that application of biological pesticides with different mechanism of action exerts a positive effect on plant growth and development, facilitates the phytosanitary situation improvement in vegetable crops and decreases the negative influence on the environment.
Przedstawiono rolę środków do biologicznej ochrony roślin przed szkodnikami w strukturze formowania i stabilizacji agrofitocenoz upraw warzywnych, ich skład ilościowy i jakościowy. Zauważono, że biologiczne pestycydy o różnej zasadzie działania zaprawy użytkowej mają pozytywny wpływ na wzrost i rozwój rośliny, ułatwiają poprawę sytuacji fitosanitarnej w uprawach warzywnych i zmniejszają negatywny wpływ na środowisko.
Źródło:
Journal of Research and Applications in Agricultural Engineering; 2017, 62, 4; 191-192
1642-686X
2719-423X
Pojawia się w:
Journal of Research and Applications in Agricultural Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The interaction between PDE and graphs in multiscale modeling
Autorzy:
Morales, F. A.
Alvares, S.N.
Powiązania:
https://bibliotekanauki.pl/articles/254867.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
coupled PDE systems
mixed formulations
porous media
analytic graph theory
complex networks
Opis:
In this article an upscaling model is presented for complex networks with highly clustered regions exchanging/trading quantities of interest at both, microscale and macroscale level. Such an intricate system is approximated by a partitioned open map in R2 or R3. The behavior of the quantities is modeled as flowing in the map constructed and thus it is subject to be described using partial differential equations. We follow this approach using the Darcy Porous Media, saturated fluid flow model in mixed variational formulation.
Źródło:
Opuscula Mathematica; 2017, 37, 2; 327-345
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Supplemental effects of silicon nutrition on growth, quality and some physiological characters of potted chrysanthemum grown in greenhouse
Suplementacyjny wpływ żywienia krzemem na wzrost, jakość i niektóre cechy fizjologiczne doniczkowych chryzantem uprawianych w szklarni
Autorzy:
Ali, E.F.
Hassan, F.A.S.
Powiązania:
https://bibliotekanauki.pl/articles/11543323.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
supplementation effect
silicon
membrane stability
plant growth
plant quality
plant physiology
pot chrysanthemum
chrysanthemum
greenhouse
Opis:
Potted chrysanthemum is one of the most important floriculture plants which commercially produced in greenhouses where silicon (Si) is available in limited concentration because of using several substrates as growing media. Therefore, this study was conducted to investigate the supplemental effects of Si nutrition on growth, flowering, flower longevity as well as shelf life and nutrients content of potted chrysanthemum in relation to Si application. Moreover, the effects of Si treatment on some physiological parameters i.e. chlorophyll content, stomatal resistance, membrane stability index (MSI) and total carbohydrates were also investigated. Si application as K₂SiO₃ was added whether as foliar application at 25, 75 and 125 mg L⁻¹ Si or soil drenches at 50, 100 and 150 mg L⁻¹ Si. Except plant height and leaf area, the other vegetative growth and flowering characters were improved as a result of both Si supplementation methods compared with untreated control. Flowering was earlier and shelf life was longer in Si-supplemented than nonsupplemented plants. Generally, Si application increased the macro and micronutrients concentrations (except Ca) estimated in this study. Chlorophyll content, stomatal resistance, MSI and total carbohydrates were increased among Si treated plants. Improving the floricultural traits, extending longevity and shelf life of greenhouse grown chrysanthemum may give an impact of its greenhouse commercial production if appropriate level was used.
Chryzantema doniczkowa to jedna z najważniejszych roślin, które są komercyjnie produkowane w szklarniach, gdzie krzem (Si) jest dostępny w ograniczonym stężeniu, gdyż do uprawy używane są różne podłoża. Niniejsze badanie przeprowadzono w celu zbadania skutków suplementacyjnych żywienia Si na wzrost, kwitnienie, długość życia kwiatów, a także żywotność i zawartość składników odżywczych chryzantemy doniczkowej w stosunku do aplikacji Si. Ponadto zbadano skutki zabiegów z użyciem Si na niektóre parametry fizjologiczne, to znaczy zawartość chlorofilu, działanie aparatów szparkowych, wskaźnik stabilności błon (MSI) oraz całkowitą zawartość węglowodanów. Zastosowanie Si w postaci K₂SiO₃ dodano jako aplikację dolistną w ilości 25, 75 i 125 mg L⁻¹ Si lub do podłoża przy 50, 100 i 150 mg L⁻¹ Si. Z wyjątkiem wysokości roślin i obszaru liścia, w porównaniu z kontrolą bez żadnych zabiegów, wszystkie cechy wzrostu i kwitnienia polepszyły się w wyniku zastosowania obu metod suplementacji. Kwitnienie było wcześniejsze, a żywotność dłuższa u roślin z suplementacją Si niż u roślinach bez suplementacji. Generalnie zastosowanie Si zwiększało stężenie makro- i mikroskładników (z wyjątkiem Ca) ocenianych w niniejszym badaniu. Zawartość chlorofilu, działanie aparatów szparkowych, MSI oraz całkowita zawartość węglowodanów zwiększały się wśród roślin z zastosowaniem Si. Polepszenie cech kwiatowych, zwiększenie długości życia i żywotności chryzantem hodowanych w szklarni może mieć wpływ na komercyjną produkcję szklarniową, jeśli zastosuje się jego odpowiedni poziom.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2016, 15, 4; 85-98
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wskaznik gotowosci technicznej miara niezawodnosci dzialania przepompowni melioracyjnych
Autorzy:
Wrobel, F A
Bala, W
Kaczorowski, J
Powiązania:
https://bibliotekanauki.pl/articles/794744.pdf
Data publikacji:
1995
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
niezawodnosc
przepompownie
agregaty pompowe
wskaznik gotowosci technicznej
Opis:
Na podstawie badań eksploatacyjnych wybranych przepompowni przydepresyjnych wyznaczono wskaźniki niezawodności stosowanych agregatów pompowych. Uwzględniając charakter pracy przepompowni przyjęto, że najodpowiedniejszą miarą sprawności zestawu pompowego jest wskaźnik gotowości technicznej. Opracowano model pracy przepompowni i algorytm wyznaczania wartości liczbowych wskaźnika.
On base of operating testing selecting depression pumping station - determinate index of operational reliability using pumping unit. Take into consideration pumping station work character - make an assumption, that more adequate measure is technical readiness index. Elaborate pumping stations work model and algorithm determinate numerical value with compute’s simulation application.
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 1995, 423; 359-365
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improvement of silymarin content in cell cultures of Silybum marianum by copper sulphate elicitor
Autorzy:
Elsharnouby, M.E.
Hassan, F.A.S.
Powiązania:
https://bibliotekanauki.pl/articles/11893796.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
plant cultivation
milk thistle
Silybum marianum
herbal plant
medicinal plant
cell culture
silymarin
copper sulphate
Opis:
Silybum marianum L. (Milk thistle) extracts are the main source of silymarin that is a mixture of various flavonolignan (silybin (silibinin), silydianin and silychristin). Silymarin of milk thistle has a hepatoprotective activity for liver cirrhosis and chronic inflammatory. Silybum marianum regeneration from hypocotyl explants and evaluation of their callogenesis, growth and total flavolignan (silymarin) upon copper sulphate (as abiotic elicitor) elicitation was targeted. Copper sulphate (CuSO4) was applied in concentrations of 0, 3, 5, 7 and 9 µM to elicit the silymarin production in cultures. The elicitation periods used in this study were 2, 4, 7, 14 and 28 days. Half-strength MS medium recorded better results relative to full-strength MS one and seed incubation in the darkness at room temperature resulted in rapid germination and reached to the gar lid after 10 days. Callus fresh and dry weights as well as growth index were gradually increased with increasing the copper sulphate concentration till 5 µM while decreased thereafter at any elicitation period. With the increase of the elicitation period, the increase of the previous parameters was observed. Flavonolignan (silymarin) was positively correlated with CuSO4 levels since all levels of copper sulphate significantly enhanced its content in relative to the control. Additionally, more silymarin was accumulated after 4 or 7 days and the accumulation significantly decreased when the elicitation period reached 14 days more. The highest silymarin (flavolignan) content (11.79 and 11.67 mg g–1 DW) was obtained when 5 or 7 µM copper sulphate levels were combined with 4 days elicitation period, being about five-fold of the control.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2018, 17, 2; 105-114
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New expression to calculate quantity of recovered heat in the earth-pipe-air heat-exchanger operating in winter heating mode
Autorzy:
Molcrette, Vincent F. A.
Autier, Vincent R. B.
Powiązania:
https://bibliotekanauki.pl/articles/240792.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
earth-pipe-air heat-exchanger
analytical model
air heating
Opis:
A new expression is proposed to calculate the earth-energy of an earth-air-pipe heat exchanger during winter heating for three kinds of soil in France. An analytical model is obtained by using numerical computation developed in Scilab – a free open source software. The authors showed the comparison between their simple analytical model and experimental results. They showed the influence of different parameters to specify the size of the heat exchanger.
Źródło:
Archives of Thermodynamics; 2020, 41, 2; 103-117
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical activity level and energy expenditure of clinical physiotherapists and physiotherapy educators in selected tertiary health and educational institutions in South-West Nigeria
Autorzy:
Fabunmii, A.A.
Sanuade, C.
Adepoju, F.A.
Powiązania:
https://bibliotekanauki.pl/articles/2088288.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Opolski. Instytut Nauk o Zdrowiu
Tematy:
Physical activity
energy expenditure
number of steps
physiotherapists
Opis:
Background: Physiotherapists are trained in the use of physical activity for health promotion, and therefore are expected to be physically active themselves. Aim of the study: This study determined the physical activity level and energy expenditure of clinical physiotherapists and physiotherapy educators. Material and methods: The research design is cross-sectional survey. Sixty participants were selected using the consecutive sampling technique. A pedometer (Omron) was used to measure the number of steps taken by the participants, the distance covered, and the overall energy expenditure. The number of steps was used to classify the participants’ physical activity levels. The data obtained were analysed using descriptive statistics and frequency, percentages and chi-square inferential statistics, Pearson product-moment correlation, Spearman’s rank correlation, independent t-tests and Mann-Whitney U tests. The alpha level was set at 0.05. Results: The mean age and BMI of all participants were 36.81±7.86 years and 26.16±4.46kg/m² respectively. The average number of steps taken per day was 8002±3411 and the mean energy expenditure was 248.26±182.92kcal. This study revealed that 21.3% of the participants were sedentary, 27.7% were ‘low active’, 27.7% were moderately active, 10.6% were active and 12.8% were highly active. The Pearson product-moment correlation coefficient showed a significant negative relationship between the number of steps and age (r = -0.292 p= 0.047) and a significant positive relationship between the number of steps and energy expenditure (r = 0.325; p = 0.026), respectively. There was a significant inverse relationship between the number of steps, the energy expenditure and the age of the participants. There was no significant difference in the number of steps per day, PAL and energy expenditure between clinical physiotherapists and physiotherapy educators. Conclusions: Physiotherapists should improve their physical activity levels, as most of them (76.7%) were classified in the low activity level category.
Źródło:
Medical Science Pulse; 2019, 13, 3; 3-9
2544-1558
2544-1620
Pojawia się w:
Medical Science Pulse
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Full-Time Homemakers: Workers Who Cannot “Go Home and Relax”
Autorzy:
Habib, R. R.
Fathallah, F. A.
Messing, K.
Powiązania:
https://bibliotekanauki.pl/articles/91141.pdf
Data publikacji:
2010
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
homemakers
housework
paid work
musculoskeletal disorders
Opis:
This paper examined how musculoskeletal disorders (MSDs) of female homemakers were studied in the literature. It also presented preliminary findings from field observations of housework and fulltime homemakers in urban settings. PubMed, Ergonomics Abstracts, Sociofile, and PsycINFO databases were used in the literature search. The review focused on comparing demands of housework and paid work. Also, exposure factors found in studies of various occupations were compared with the results of field observations of housework in 4 homes in Beirut, Lebanon. Few studies systematically examined associations between MSDs and risk factors in housework. Some well-known risk factors for MSDs were identified in the Beirut homes; however, other unique factors were noted. Housework activities expose homemakers to known risk factors for MSDs, which calls for further studies to identify appropriate intervention and prevention strategies.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2010, 16, 1; 113-128
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The teeth of the unenlagiine theropod Buitreraptor from the Cretaceous of Patagonia, Argentina, and the unusual dentition of the Gondwanan dromaeosaurids
Autorzy:
Gianechini, F.A.
Makovicky, P.J.
Apesteguia, S.
Powiązania:
https://bibliotekanauki.pl/articles/20408.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
tooth
unenlagiine theropod
theropod
Buitreraptor
Cretaceous
Patagonia
Argentina
dentition
Gondwanan dromaeosaurid
dromaeosaurid
Theropoda
Dromaeosauridae
Unenlagiinae
Dinosauria
paleontology
dinisaur tooth
Opis:
The Unenlagiinae is a clade of Gondwanan dromaeosaurid theropods mainly known from incomplete skeletal material. The group includes two recently discovered theropods, Buitreraptor and Austroraptor, from which cranial remains are available with in situ maxillary and dentary teeth, thus allowing the study of tooth morphology. Among the derived traits that diagnose the dentition of unenlagiines are: (i) high tooth count, (ii) small size of individual teeth when compared with skull height, (iii) absence of denticles and carinae, and (iv) presence of longitudinal grooves on the tooth crown. This suite of dental characteristics, shared between Buitreraptor and Austroraptor, can be considered as diagnostic of the Unenlagiinae or, at least, a more exclusive clade within the group. The teeth of Buitreraptor exhibit a remarkable labiolingual compression, whereas Austroraptor possesses more conical teeth, probably respective autapomorphic features. On one hand, these dental morphologies differ from those observed in most Laurasian dromaeosaurids and, for instance, could be considered as further proof of the purported vicariant evolution of the lineage on the southern continents. On the other hand, the morphological similarities (e.g., absence of denticles) between the teeth of unenlagiines and other theropod lineages, including Mesozoic birds and ornithomimosaurs, can be considered as the result of parallel trends related to dental reduction.
Źródło:
Acta Palaeontologica Polonica; 2011, 56, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GIS and AHP based modeling for landfill site selection (case study: west side of Mosul city)
Autorzy:
Faisal, R.M.
Ahmed, M.F.A.-D.
Powiązania:
https://bibliotekanauki.pl/articles/887109.pdf
Data publikacji:
2018
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Źródło:
Scientific Review Engineering and Environmental Sciences; 2018, 27, 4[82]
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal performance enhancement of the mixed convection between two parallel plates by using triangular ribs
Autorzy:
Jehhef, K. A.
Badawy, F. A.
Hussein, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/1839881.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
badanie numeryczne
konwekcja mieszana
równanie Naviera-Stokesa
numerical study
mixed convection
vertical channel
triangular rib
Opis:
This paper aims to investigate the mixed convection between two parallel plates of a vertical channel, in the presence of a triangular rib. The non-stationary Navier-Stokes equations were solved numerically in a two-dimensional formulation for the low Reynolds number for the laminar air flow regime. Six triangular ribs heat-generating elements were located equidistantly on the heated wall. The ratio of the ribs to the channel width is varied (h / H = 0.1, 0.2, 0.3 and 0.4) to study the effect of ribs height effects, the ratio of the channel width to the ribs height is fixed constant at (H / w = 2) and the ratio of the channel height to the ribs pitch is fixed at (W/p=10). The influence of the Reynolds number that ranged from 68 to 340 and the Grashof number that ranged from 6.6 ×103 to 2.6 ×104 as well as the Richardson number chosen (1.4, 0.7, 0.4 and 0.2) is studied. The numerical results are summarized and presented as the profile of the Nusselt number, the coefficient of friction, and the thermal enhancement factor. The contribution of forced and free convection to the total heat transfer is analyzed. Similar and distinctive features of the behavior of the local and averaged heat transfer with the variation of thermal gas dynamic and geometric parameters are investigated in this paper. The results showed that the Nusselt number and friction factor increased by using the attached triangular ribs, especially when using the downstream ribs. Also, the results revealed that the Nusselt number increased by increasing the ratio of the ribs to the channel width.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 2; 11-30
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tooth microstructure of the Early Permian aquatic predator Stereosternum tumidum
Autorzy:
Pretto, F.A.
Cabreira, S.F.
Schultz, C.L.
Powiązania:
https://bibliotekanauki.pl/articles/21575.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
A histological investigation of the feeding apparatus of a Stereosternum specimen revealed a great number of adaptations in the structure and insertion of teeth, to deal with breakage risks. The tooth wall is composed of different layers of dentine, varying in orientation and composition. This mixed arrangement may have increased tooth resistance to lateral tension. The tooth insertion also involves more than one mechanism. The teeth are located inside shallow tooth sockets and are held in place by a tripartite periodontium (composed of alveolar bone, cementum and possibly soft periodontal tissue) and accessory structures, here termed anchorage trabeculae (mainly composed of cementum). Fully grown teeth are ankylosed to the bottom of the tooth socket. The recognition of alveolar bone and cementum (and the possible presence of a soft periodontal ligament) reinforces the idea that these tissues were widespread among Amniota, not being exclusive to mammals and archosaurs. The adaptations identified here reinforce the hypothesis that Stereosternum was an active aquatic predator.
Źródło:
Acta Palaeontologica Polonica; 2014, 59, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilizing Hollow-Structured Bamboo as Natural Sound Absorber
Autorzy:
Putra, A.
Khair, F. A.
Nor, M. J. M.
Powiązania:
https://bibliotekanauki.pl/articles/177960.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bamboo
hollow structure
acoustic absorber
absorption coefficient
Opis:
Studies to find alternative low environmental-impact materials for acoustic absorbers are still progressing, particularly those originated from natural materials. However, most of the established works are mainly focused on the fibrous-type absorbers. Discussion on the non-fibrous-type absorbers is still lacking and this therefore becomes the objective of this paper. Use of bamboo by utilizing its hollow structure to absorb sound energy is discussed here. The normal incidence absorption coefficient was measured based on the length and diameter of the bamboo, as well as different arrangement of the bamboo structure subjected to the incidence sound, namely, axial, transverse, and crossed-transverse arrangements. The trend of absorption coefficient appears in peaks and dips at equally spacing frequencies. For all arrangements the peak of absorption can reach above 0.8. Introducing an air gap behind the bamboo shifts the peak absorption to lower frequency. Covering the front surface of the absorber improves the sound absorption coefficient for axial arrangement by widening the frequency range of absorption also towards lower frequency range. The transverse arrangement is found to have average absorption coefficient peaks of 0.7 above 1.5 kHz. By arranging the bamboo structure with crossed-transverse arrangement, the suppressed absorption peaks in normal transverse arrangement can be recovered.
Źródło:
Archives of Acoustics; 2015, 40, 4; 601-608
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A connectionist computational method for face recognition
Autorzy:
Pujol, F. A.
Mora, H.
Girona-Selva, J. A.
Powiązania:
https://bibliotekanauki.pl/articles/330558.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
pattern recognition
face recognition
neural network
self organizing map
rozpoznawanie wzorca
rozpoznawanie twarzy
sieć neuronowa
samodzielne organizowanie map
Opis:
In this work, a modified version of the elastic bunch graph matching (EBGM) algorithm for face recognition is introduced. First, faces are detected by using a fuzzy skin detector based on the RGB color space. Then, the fiducial points for the facial graph are extracted automatically by adjusting a grid of points to the result of an edge detector. After that, the position of the nodes, their relation with their neighbors and their Gabor jets are calculated in order to obtain the feature vector defining each face. A self-organizing map (SOM) framework is shown afterwards. Thus, the calculation of the winning neuron and the recognition process are performed by using a similarity function that takes into account both the geometric and texture information of the facial graph. The set of experiments carried out for our SOM-EBGM method shows the accuracy of our proposal when compared with other state-of the-art methods.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2016, 26, 2; 451-465
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of moisture content on crackability of bambara groundnut using a centrifugal cracker
Autorzy:
Oluwole, F.A.
Abdulrahim, A.T.
Olalere, R.K.
Powiązania:
https://bibliotekanauki.pl/articles/26573.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
groundnut
crackability
bambara groundnut
Vigna subterranean
moisture content
centrifugal cracker
Źródło:
International Agrophysics; 2007, 21, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Globicephaline whales from the Mio-Pliocene Purisima Formation of central California, USA
Autorzy:
Boessenecker, R.W.
Perry, F.A.
Geisler, J.H.
Powiązania:
https://bibliotekanauki.pl/articles/945570.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Mammalia
Cetacea
Odontoceti
Delphinidae
Globicephalinae
paleontology
Pliocene
Purisima Formation
California
USA
Opis:
Oceanic dolphins (Odontoceti: Delphinidae) constitute the most speciose family of extant cetaceans, yet their fossil record is limited. Although several extinct species are known from Mediterranean and North Atlantic localities, there are few examples from deposits along the Pacific Rim. Despite the rich record of successive marine mammal fossil assemblages in the extensively sampled eastern North Pacific, only one fossil delphinid, Protoglobicephala (Pliocene, Baja California), has been described. We report globicephaline remains from the Mio-Pliocene Purisima Formation of Northern California, including a partial cranium and two isolated petrosals. The skull exhibits large ridges on the premaxillae, and cannot be referred to any extant globicephaline genus. Similarly, the petrosals cannot be referred to any described delphinid genus, although they are most similar to those of Globicephala. Linear regression analyses demonstrate that promontorium length and bony nares width scale significantly within delphinidans, and provide a new method for testing referrals of isolated fossil odontocete petrosals to taxa known only by crania. Applying this method to the new globicephalines from the Purisima Formation, we find the petrosals to be too small to represent the same taxon as the skull, thus indicating the presence of two separate species. Our results demonstrate that globicephalines had achieved a worldwide distribution by the early Pliocene, suggesting diversification of the subfamily by 5 Ma.
Źródło:
Acta Palaeontologica Polonica; 2015, 60, 1; 113-122
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Land cover change assessment of vaal harts irrigation scheme using multi-temporal satellite sata
Autorzy:
Otieno, F. A.
Ojo, O. I.
Ochieng, G. M.
Powiązania:
https://bibliotekanauki.pl/articles/205331.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
land use change
vaal harts
GIS
normalized difference vegetation index
NDVI
VHS
Opis:
Land cover change (LCC) is important to assess the land use/land cover changes with respect to the development activities like irrigation. The region selected for the study is Vaal Harts Irrigation Scheme (VHS) occupying an area of approximately 36, 325 hectares of irrigated land. The study was carried out using Land sat data of 1991, 2001, 2005 covering the area to assess the changes in land use/land cover for which supervised classification technique has been applied. The Normalized Difference Vegetation Index (NDVI) index was also done to assess vegetative change conditions during the period of investigation. By using the remote sensing images and with the support of GIS the spatial pattern of land use change of Vaal Harts Irrigation Scheme for 15 years was extracted and interpreted for the changes of scheme. Results showed that the spatial difference of land use change was obvious. The analysis reveals that 37.86% of additional land area has been brought under fallow land and thus less irrigation area (18.21%). There is an urgent need for management program to control the loss of irrigation land and therefore reclaim the damaged land in order to make the scheme more viable.
Źródło:
Archives of Environmental Protection; 2013, 39, 4; 59-70
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonparametric predictive inference in reliability and risk: recent developments
Autorzy:
Coolen, F. P. A.
Powiązania:
https://bibliotekanauki.pl/articles/2069524.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
competing risks
imprecise reliability
lower probability
upper probability
nonparametric predictive inference
system reliability
unobserved or unknown failure modes
Opis:
During the last two decades, statistical methods using lower and upper probabilities have become increasingly popular. One such method is Nonparametric Predictive Inference (NPI), which makes relatively few modelling assumptions. Due to the specic nature of many reliability and risk scenarios, NPI provides attractive new solutions to many problems in these elds. This paper provides an introductory overview to this area, including examples on competing risks, system reliability and prediction of unobserved or even unknown failure modes.
Źródło:
Journal of Polish Safety and Reliability Association; 2011, 2, 1; 39--50
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of transplantation on heavy metal concentrations in commercial clams of Lake Timsah, Suez Canal, Egypt
Autorzy:
Gabr, H.R.
Gab-Alla, A.A.-F.A.
Powiązania:
https://bibliotekanauki.pl/articles/48183.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
inshore water
Venerupis pullastra
clam
heavy metal concentration
Egypt
Suez Canal
public health
commercial clam
risk
transplantation effect
Ruditapes decussatus
Lake Timsah
Opis:
Ruditapes decussatus and Venerupis pullastra are commercially fished clams with a wide distribution in the shallow inshore waters of Lake Timsah, Egypt. They are usually contaminated with heavy metals. Consumption of such contaminated clams can pose a public health risk. To minimize this risk, therefore, the clams should be removed from the contaminated waters and transferred to an approved area to reduce the high levels of metals before being marketed. The aim of this work was to study the effect of transplantation on levels of heavy metals (Fe, Mn, Zn, Cu,Ni, Co,Cd,Pb) in these clams. The clams were removed from their polluted site and transplanted to a relatively clean area for a period of 120 days. Although the salinity at the transplantation site was higher than at the polluted site, it was stable and did not appear to have any adverse effect on clam growth. Heavy metals were analysed in the water, sediment and clam tissues from both the polluted and the transplantation sites. Although in both species transplantation evidently reduced heavy metal levels, these still exceeded the maximum permissible levels laid down by the WHO (1982).
Źródło:
Oceanologia; 2008, 50, 1; 83-93
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of droughts in the Lankaran region of Azerbaijan
Badania suszy w regionie Lankaran w Azerbejdżanie
Autorzy:
Imanov, F. A.
Mammadov, A. S.
Hasanova, N. I.
Powiązania:
https://bibliotekanauki.pl/articles/292819.pdf
Data publikacji:
2012
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
Lankaran
przepływ wody w rzece
standaryzowany wskaźnik opadu
strefa klimatyczna
susza
drought
SPI
climatic zone
river flow
Opis:
As part of the World Food Program, investigating droughts is within the scope of our interest. Therefore, this paper presents results of studies on droughts in one of the most important economic regions of Azerbaijan. There are different methods to investigate drought. As chosen region is characterised by large precipitation, we preferred to use the SPI method to carry on our study. During the research, dry years were determined according to the seasonal and annual data from weather stations in the province.
Badania suszy jako elementu Światowego Programu Żywnościowego mieszczą się w obszarze naszych zainteresowań badawczych. Niniejszy artykuł przedstawia wyniki badań nad suszą w jednym z najważniejszych gospodarczo obszarów Azerbejdżanu. Istnieją różne metody analizowania suszy. Ponieważ wybrany region charakteryzuje się znacznymi opadami, do badań wybrano metodę standaryzowanego wskaźnika opadu (SPI). Lata suche wyznaczono według sezonowych i rocznych danych, pozyskanych ze stacji meteorologicznych regionu. Analiza opadów z lat 1891-2007 wykazała, że liczba susz w drugiej połowie tego okresu była około 14% większa niż w pierwszej. Co więcej, susze w drugiej połowie były znacznie głębsze i dotkliwsze dla rolnictwa. Wynika to m.in. z faktu, że opady zmniejszyły się o 5-8%. Analizy wykazują, że w ostatnich 5-6 latach dwukrotnie zwiększył się pobór wody w zlewni rzek Lankaran i stale zwiększa się deficyt wody. Susze powodują straty ekologiczne i przyczyniają się do występujących okresowo braków żywności. Jest to więc istotny problem nie tylko przyrodniczy, ale też socjalno-ekonomiczny.
Źródło:
Journal of Water and Land Development; 2012, no. 16 [I-VI]; 11-15
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Somatic embryogenesis and plant regeneration from hypocotyl and leaf explants of Brassica oleracea var. botrytis (cauliflower)
Autorzy:
Siong, P.K.
Taha, R.M.
Rahiman, F.A.
Powiązania:
https://bibliotekanauki.pl/articles/19314.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
somatic embryogenesis
plant regeneration
hypocotyl
leaf explant
Brassica oleracea var.botrytis
cauliflower
embryogenic callus
callus
tissue culture
Opis:
We investigated direct and indirect formation of somatic embryogenesis in Brassica oleracea var. botrytis (cauliflower), a very important vegetable crop worldwide. Direct somatic embryogenesis, which is rather rare, was achieved in culture of 2-week-old hypocotyl explants of Brassica oleracea var. botrytis on MS medium supplemented with 1.0 mg/l 2,4-dichlorophenoxyacetic acid (2,4-D) and 0.5; 1.0; and 1.5 mg/l kinetin. Initial induction of embryogenic callus was achieved on MS supplemented with very low concentrations of 2,4-D (0.05 mg/l and 0.1 mg/l). Indirect somatic embryogenesis from leaf sections was obtained on MS supplemented with 0.05 or 0.1 mg/l 2,4-D. We examined various stages of somatic embryos (globular, heart, torpedo, cotyledonary). More embryos per explant were produced through the indirect pathway (23–25) than through the direct pathway (14–19). The number of embryos produced was high. There is a potential for recurrent, repeated or secondary somatic embryogenesis, possibly an unlimited source for mass propagation and ideal for synthetic seed production in this species. Plant regeneration was achieved on half-strength MS medium without any hormones.
Źródło:
Acta Biologica Cracoviensia. Series Botanica; 2011, 53, 1
0001-5296
Pojawia się w:
Acta Biologica Cracoviensia. Series Botanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear elastic brittle damage: numerical solution by means of operator split methods
Autorzy:
Pires-Domingues, S.M.
Costa-Mattos, H.
Rochinha, F.A.
Powiązania:
https://bibliotekanauki.pl/articles/279553.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
damage mechanics
finite elements
splitting technique
Opis:
The avoid the loss of well-posedness in the post localization range, some continuum damage theories for elastic materials introduce higher order gradients of the damage variable into constitutive model. Although such theories allow for mathematically correct modelling of the strain localization phenomena, they are usually considered to be very complex to handle from the numerical point of view. The present work deals with the numerical implementation of a gradient-enhanced damage theory for elastic materials. A simple numerical technique, based on the finite element method, is proposed to approximate the solution to the resulting nonlinear mathematical problems. The coupling between damage and strain variables is circumvented by means of a splitting technique.
Celem poprawności sformułowania problemu w pewnych teoriach zniszczenia do modelu konstytutywnego materiałów sprężystych wprowadza się wyższe gradienty zmiennych opisujących zniszczenie. Chociaż teorie takie umożliwiają matematycznie poprawne modelowanie zjawisk lokalizacji odkształceń, to z punktu widzenia numeryki stosowanie ich uważa się zwykle za bardzo skomplikowane. W niniejszej wersji przedstawiono zastosowanie numeryczne teorii zniszczenia z wyższymi gradientami do materiałów sprężystych. Do przybliżonego rozwiązania otrzymanych nieliniowych zadań matematycznych zaproponowano prostą metodę numeryczną opartą na metodzie elementów skończonych. Użycie metody operatorowej pozwoliło uniknąć sprężenia między zmiennymi opisującymi zniszczenie i odkształcenie.
Źródło:
Journal of Theoretical and Applied Mechanics; 1999, 4; 847-861
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantitative data on the genus Loftusia from the Zagros Mts., northern Iraq
Autorzy:
Görmüş, M.
Nuaimy, Q. A. M.
Ameen Lawa, F. A.
Powiązania:
https://bibliotekanauki.pl/articles/139008.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Loftusia
northern Iraq
maastrichtian
quantitative data
Irak
mastrycht
kreda późna
dane ilościowe
Opis:
The Maastrichtian sediments of northern Iraq are rich in larger benthic foraminifera. Among them, the genus Loftusia is well-known one because of its significant palaeogeographic distribution across the Mediterranean and Middle East. In this study, observations of abnormal test shapes, species recognition criteria and endoskeleton characteristics of Loftusia are discussed, based on the new material from north-eastern Iraq. The following species of Loftusia are described: Loftusia elongata Cox, L. persica Brady, Loftusia morgani Douvillé, L. anatolica Meriç, L. matsumarui Meriç and Görmüs, L. minor B Cox, L. ketini B Meriç and L. kahtaensis Meriç, Loftusia minor A Cox, L. oktayi Meriç and L. baykali Meriç. The predominant species are Loftusia elongata, L. morgani and L. baykali. Skewed abnormal individuals and epidermal parts of the endoskeleton structure are also interesting aspects to note. Quantitative data obtained for Loftusia allow us to better understand and interpret species identification criteria, abnormal occurrences and the endoskeleton structure.
Źródło:
Acta Geologica Polonica; 2018, 68, 2; 207-218
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact interaction of three different tillage methods and rice residual management on soil physical properties and rice growth
Autorzy:
Mobaraki, F.A.
Torkashvand, A.M.
Shahrestani, M.S.
Aalami, A.
Powiązania:
https://bibliotekanauki.pl/articles/905360.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Opis:
One of the major problems of rice cultivation in Guilan is traditional rice cultivation along with autumn tillage and burning last year’s residual, which besides wasting this valuable organic source is followed by environmental pollution in September and October each year. This study aimed to evaluate three different methods of tillage as far as soil physical properties and rice growth under crop residual burning and conservation conditions are concerned. Therefore, an area of 1,800 square meters was chosen in Islamabad Village, Pirbazar District, Rasht. A factorial experiment was designed and conducted in a randomized complete block design with 6 treatments in 3 replications and in 18 plots (each plot = 10 × 10 square meters). Treatments included tillage factor with no-tillage, autumn and winter tillage methods; and residue management factor included crop residual burning and conservation. The results showed that the amount of soil organic matter in residual burning and residual conservation was 2.18% and 2.69%, respectively, showing a 0.51% increase in organic matter. The amount of organic matter in no-tillage method (2.20%) showed a signifiant decrease of 0.32% and 0.38% compared with autumn tillage (2.52%) and winter tillage (2.58%), respectively. Surface water infitration in soil before performing treatments was 2.01 mm per minute, which was signifiantly increased by 2.81 mm per minute in crop residual conservation treatment, 2.91 mm per minute in winter tillage and 2.38 mm per minute in autumn tillage. Rice grain weight was signifiantly increased in residual conservation and no-tillage conditions. According to the results of this study, incorporation of rice residues into the soil by plowing can be recommended.
Źródło:
Polish Journal of Soil Science; 2018, 51, 1
0079-2985
Pojawia się w:
Polish Journal of Soil Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The cotton mealybug Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae) as a new insect pest on tomato plants in Egypt
Autorzy:
Ibrahim, S.S.
Moharum, F.A.
Abd El-Ghany, N.M.
Powiązania:
https://bibliotekanauki.pl/articles/65060.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Recently, the mealybug Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae) was recorded as a new pest on tomato plants (Lycopersicon esculentum Mill) growing in Egypt. The mealybugs specimens were collected from tomato plants in the Qalyoubia governorate during summer season of 2014. The mealybug was identified as P. solenopsis based on the morphological characters and taxonomic key of this species. This study represents the first record of P. solenopsis as a new insect pest attacking tomato plants in Egypt.
Źródło:
Journal of Plant Protection Research; 2015, 55, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Light Propagation in a Magnetic Field: Random Green Matrix Approach
Autorzy:
Pinheiro, F. A.
Rusek, M.
Orłowski, A.
van Tiggelen, B. A.
Powiązania:
https://bibliotekanauki.pl/articles/2037256.pdf
Data publikacji:
2004-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.Dd
78.20.Ls
Opis:
We studied the spectral properties of the matrices describing multiple scattering of electromagnetic waves from randomly distributed point-like magneto-optically active scatterers under an external magnetic field B. We showed that the complex eigenvalues of these matrices exhibit some universal properties such as the self-averaging behavior of their real parts, as in the case of scatterers without magneto-optical activity. However, the presence of magneto-optically active scatterers is responsible for a striking particularity in the spectra of these matrices: the splitting of the values of the imaginary part of their eigenvalues. This splitting is proportional to the strength of the magnetic field and can be interpreted as a consequence of the Zeeman splitting of the energy levels of a single scatterer.
Źródło:
Acta Physica Polonica A; 2004, 105, 4; 339-347
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Discrimination of Acoustic Emission Signals for Damage Assessment in a Reinforced Concrete Slab Subjected to Seismic Simulations
Autorzy:
Sagasta, F. A.
Torné, J. L.
Sánchez-Parejo, A.
Gallego, A.
Powiązania:
https://bibliotekanauki.pl/articles/177863.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic emission
structural health monitoring
reinforced concrete structures
signal processing
Opis:
The purpose of this work is to distinguish between Acoustic Emission (AE) signals coming from mechanical friction and AE signals coming from concrete cracking, recorded during fourteen seismic simulations conducted with the shaking table of the University of Granada on a reinforced concrete slab supported on four steel columns. To this end, a particular criterion is established based on the Root Mean Square of the AE waveforms calculated in two different temporal windows. This criterion includes a parameter calculated by optimizing the correlation between the mechanical energy dissipated by the specimen (calculated by means of measurements with accelerometers and displacement transducers) and the energy obtained from the AE signals recorded by low-frequency piezoelectric sensors located on the specimen. The final goal of this project, initiated four years ago, is to provide a reliable evaluation of the level of damage of Reinforced Concrete specimens by means of AE signals to be used in future Structural Health Monitoring strategies involving RC structures.
Źródło:
Archives of Acoustics; 2013, 38, 3; 303-310
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power spectrum optimization in the design of multisine manoeuvre for identification purposes
Autorzy:
Lichota, P.
Szulczyk, J.
Noreña, D. A.
Vallejo Monsalve, F. A.
Powiązania:
https://bibliotekanauki.pl/articles/279485.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
flight dynamics
optimal input design
multisine excitations
system identification
least squares
maximum likelihood
Opis:
In this paper, two sets of multisine signals are designed for system identification purposes. The first one is obtained without any information about system dynamics. In the second case, the a priori information is given in terms of dimensional stability and control derivatives. Magnitude Bode plots are obtained to design the multisine power spectrum that is optimized afterwards. A genetic algorithm with linear ranking, uniform crossover and mutation operator has been employed for that purpose. Both designed manoeuvres are used to excite the aircraft model, and then system identification is performed. The estimated parameters are obtained by applying two methods: Equation Error and Output Error. The comparison of both investigated cases in terms of accuracy and manoeuvre time is presented afterwards.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 4; 1193-1203
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using tags in an AIML-based chatterbot to improve its knowledge
Autorzy:
Mikic, F. A.
Burguillo, J. C.
Peleteiro, A.
Rey-Lopez, M.
Powiązania:
https://bibliotekanauki.pl/articles/305303.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
AIML
chatterbots
folksonomies
tagging
natural language
Opis:
Nowadays, it is common to find on the Internet different conversational robots which interact with users simulating a natural language conversation. Among them, we can emphasize the chatterbots based on AIML language. In this paper we present an AIML based chatterbot that shows as its main contribution the use of tags and folksonomies. Thanks to its use, we can generate a context for each conversation, being able to maintain a state for each user in the system, and improving the adaptation capabilities of the bot.
Źródło:
Computer Science; 2012, 13 (2); 123-133
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New arylhydrazonothiazolidin-5-one disperse dyes for dyeing polyester fibers
Autorzy:
Metwally, M.A.
Khalifa, M.E.
Attia, E.A.
Amer, F.A.
Powiązania:
https://bibliotekanauki.pl/articles/778416.pdf
Data publikacji:
2010
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
tiazolidyn-5-on
sole diazoniowe
barwniki zawiesinowe
włókna poliestrowe
właściwości barwne
thiazolidin-5-one
diazonium salts
azo coupling
disperse dyes
polyester fibers
fastness properties
color properties
Opis:
A series of new thiazolidin-5-one disperse dyes was synthesized from the reactions of 2-substituted 3-phenylthiazolidinones with various aryldiazonium chlorides. The synthesized dyes were characterized by UV-visible absorption, IR, NMR and MS spectroscopy. The dyes gave orange to reddish-violet shades with very good depth on polyester fibers. The dyed fabrics show moderate to good fastness to light and very good to excellent fastness to washing and perspiration. Also, the assessment of color coordinates was discussed.
Źródło:
Polish Journal of Chemical Technology; 2010, 12, 1; 1-6
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unified power quality conditioner in a grid-connected photovoltaic system
Autorzy:
Cavalcanti, M. C.
Azevedo, G. M.
Amaral, B. A.
Neves, F. A.
Powiązania:
https://bibliotekanauki.pl/articles/262717.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
control systems
converters
energy conversion
photovoltaic power systems
power quality
solar energy
Opis:
This paper presents a system that provides photovoltaic generation as well as the functions of a unified power quality conditioner. The system can be controlled for current harmonics and reactive power compensation simultaneously by using a converter operating as active shunt filter. The other converter is used as active series filter and it compensates voltage harmonics or voltage sags and swells. Using only an inverter in photovoltaic energy conversion process, the system presents increased efficiency when compared to the conventional systems. The synchronous reference frame method is used to control the three-phase converters. Simulation results demonstrate the good performance of the proposed configuration. Experimental results corresponding to the operation of the series filter as voltage sag compensator are presented.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2006, 12, 2; 59-69
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of State Affiliated Directors on the capital structure speed of adjustment in an emerging makret
Wpływ państwowych dyrektorów stowarzyszonych (SAD) na prędkość dostosowania struktury kapitałowej na rynkach rozwijających się
Autorzy:
Hussain, H. I.
Abidin, I. S. Z.
Kamarulzaman, R.
Shawtari, F. A.
Powiązania:
https://bibliotekanauki.pl/articles/404698.pdf
Data publikacji:
2018
Wydawca:
Politechnika Częstochowska
Tematy:
capital structure
speed of adjustment
state affiliated directors
board composition
board independence
randomized tests
struktura kapitału
szybkość dostosowań
zależni dyrektorzy państwowi
skład zarządu
niezależność zarządu
testy losowe
Opis:
This study analyses a unique aspect of the speed of adjustment to optimal debt levels in an emerging market by accounting for the impact of State Affiliated Directors (SAD) on internal governance mechanisms. The paper is motivated based view where firms adjust to reach an optimal level of debt ratio as well as the agency problem arising from the separation of ownership and control leading to conflicting interests between managers and shareholders in order to maximize firm value, which could ultimately impede shareholders wealth maximization. Furthermore, the potential for conflict between controlling and minority shareholders are also captured in the appointment of directors linked to the state. The authors, therefore, evaluate the presence of state affiliated directors and their potential to compromise board independence, which may lead to sub-optimal financing decisions. Analyzing firms below target levels, the study finds that the presence of SAD allows firms below target levels to adjust at more rapid rates given the potential for favorable treatment while obtaining credit financing from financial institutions. Contrastingly, the findings, however, show that firms which exceed target leverage levels tend to adjust at more rapid rates in the absence of SAD on boards. The study results point towards the reluctance of these firms to raise financing in equity markets given the possible dilution of ownership of controlling shareholders as well as the reluctance to reduce debt levels. The findings are consistent regardless of measuring debt based on book or market values and across randomized measures of board composition implying that the presence of SAD alters the dynamics of the cost of capital and thus managerial financing decisions.
Badanie to analizuje unikalny aspekt szybkości dostosowywania się do optymalnych poziomów zadłużenia na wschodzącym rynku poprzez uwzględnienie wpływu państwowych dyrektorów stowarzyszonych (SAD) na mechanizmy wewnętrznego zarządzania. Artykuł przedstawia obraz, w którym firmy dostosowują się do osiągnięcia optymalnego poziomu wskaźnika zadłużenia, jak również problem agencji wynikający z oddzielenia własności i kontroli prowadzącej do sprzecznych interesów pomiędzy menedżerami i akcjonariuszami w celu zmaksymalizowania wartości firmy, co może ostatecznie zahamować maksymalizację bogactwa akcjonariuszy. Ponadto przy powoływaniu dyrektorów powiązanych z państwem również brany pod uwagę jest potencjał konfliktu między akcjonariuszami kontrolującymi a akcjonariuszami mniejszościowymi. Autorzy oceniają zatem obecność państwowych dyrektorów stowarzyszonych i ich potencjał zagrażający niezależności rady, co może prowadzić do nieoptymalnych decyzji finansowych. Badanie wykazało, że obecność SAD pozwala firmom poniżej poziomów docelowych na szybsze dostosowanie, biorąc pod uwagę możliwość uprzywilejowanego traktowania przy uzyskiwaniu finansowania kredytowego od instytucji finansowych. Kontrastująco, wyniki pokazują również, że firmy, które przekraczają docelowe poziomy dźwigni, mają tendencję do szybszego dostosowywania się w przypadku braku SAD w zarządach. Wyniki badania wskazują na niechęć tych firm do pozyskania finansowania na rynkach akcji, biorąc pod uwagę potencjalne osłabienie własności akcjonariuszy kontrolujących oraz niechęć do obniżania poziomu zadłużenia. Ustalenia są spójne, niezależnie od pomiaru zadłużenia w oparciu o wartości księgowe lub rynkowe oraz poprzez losowe miary składu zarządu, co oznacza, że obecność SAD zmienia dynamikę kosztu kapitału, a tym samym decyzji finansowych dotyczących zarządzania.
Źródło:
Polish Journal of Management Studies; 2018, 18, 1; 133-148
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rapid detection and enumeration of coliforms and Escherichia coli in River Nile using membrane filtration technique
Autorzy:
Shash, S. M.
Kamel, M. M.
Al-Wasify, R. S.
Samhan, F. A.
Powiązania:
https://bibliotekanauki.pl/articles/363162.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
filtracja membranowa
Nil rzeka
bakterie grupy coli
membrane filtration
Nile river
total coliforms
Opis:
The purpose of this investigation was to compare Rapid Hicoliform Agar® (RHA, Himedia, India) with the conventional m-Endo Agar (DIFCO, Michigan, USA) for detection and enumeration of Total Coliforms (TC) and with the conventional Seven Hour Fecal Coliforms Agar (7hFC) for detection and enumeration of Escherichia coli using Membrane Filtration (MF) in River Nile water, Egypt. Sixty samples were collected (five samples per month) from five regions (Kafr El-Elw, El-Maasara, El-Giza, Embaba and El-Galatma) during one year (December 2005-November 2006). The results showed that total coliforms counts ranged from 103 to 104 CFU*100ml-1 using RHA but using m-Endo Agar the counts were around 104 CFU*100ml-1. Escherichia coli counts ranged from 103 to 104 CFU*100ml-1 using 7hFC Agar, while using RHA the counts ranged from 103 to 104 CFU*100ml-1. Statistical analysis showed that there was no significant difference (p=0.423) between total coliforms counts using m-Endo Agar and RHA media, also, there was no significant difference (p=0.546) between fecal coliforms (E. coli) counts using 7hFC Agar and RHA media. We conclude that RHA is a potential alternative medium for detection and enumeration of total coliforms and E. coli at the same time and the same Petri dish within 24h. Also, RHA medium was a very sensitive medium, which did not require any confirmatory tests and secured rapid recovery of total coliforms or E. coli.
Źródło:
Environmental Biotechnology; 2010, 6, 1; 6-10
1734-4964
Pojawia się w:
Environmental Biotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inorganic and organic solutes in apoplastic and symplastic spaces contribute to osmotic adjustment during leaf rolling in Ctenanthe setosa
Autorzy:
Saglam, A
Terzi, R.
Nar, H.
Saruhan, N.
Ayaz, F.A.
Kadioglu, A.
Powiązania:
https://bibliotekanauki.pl/articles/19915.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
In Ctenanthe setosa we studied changes in apoplastic and symplastic sugar, proline, ions and organic acids under drought stress causing leaf rolling. Leaf extractions were made at visually judged leaf rolling stages (not rolled, slightly rolled, strongly rolled, completely rolled). Glucose and sucrose content increased in the symplast. Glucose declined during leaf rolling in the apoplast, and sucrose was not present. Symplastic and apoplastic proline content increased during leaf rolling; citrate increased in both compartments, and malate increased in the symplast but declined in the apoplast. Symplastic and apoplastic K+ declined during rolling. Ca2+ increased at slightly rolled stage but then began to decrease in both compartments. Na+ level increasing in the symplast but decreased in the apoplast. Cl- decreased in both compartments during rolling. Glucose, proline, Na+ and K+ are preferred for osmotic adjustment during leaf rolling under drought.
Źródło:
Acta Biologica Cracoviensia. Series Botanica; 2010, 52, 1; 37-44
0001-5296
Pojawia się w:
Acta Biologica Cracoviensia. Series Botanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal effects of laser irradiation on maize seeds
Autorzy:
Hernandez Aguilar, C.
Dominguez Pacheco, F.A.
Cruz Orea, A.
Ivanov Tsonchev, R.
Powiązania:
https://bibliotekanauki.pl/articles/26520.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Opis:
It is important to know the temperature changes in seeds that have been irradiated with laser light because this could have substantial practical and theoretical importance. Thus, the thermal effects of low intensity laser irradiation on seeds was studied, showing variation of temperature produced by laser light applied during 60 s on two maize seed genotypes, ‘Toluqueño’ and ‘Cacahuazintle’: crystalline and floury, respectively, under two different conditions: natural colour and dyed black, evaluating the temperature changes by a thermal camera. The optical absorption spectra and the non-radiative relaxation time of the seeds were obtained using photoacoustic spectroscopy. The results indicate that it is possible to produce temperature changes, detected by an infrared camera, in crystalline and floury seeds when theyare irradiated with a laser beam at a 650 nm wavelength and27.4 mW power. The highest variation of temperature in the seeds was obtained for the black-dyed condition, these variations being 5.56 and 9.28°C for crystalline and floury seeds, respectively. Among the seeds, in the dyed condition, the floury seed had the lower non-radiative relaxation time, the higher optical absorption coefficient and a lower optical penetration length at the laser wavelength (650 nm).
Źródło:
International Agrophysics; 2015, 29, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of fresh palm oil mill effluent biodegradation with Aspergillus niger and Trichoderma virens
Autorzy:
Jalaludin, N.
Rahman, R. A.
Razali, F.
Barghash, H. F. A.
Sukri, S. S. M.
Powiązania:
https://bibliotekanauki.pl/articles/204704.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Aspergillus niger
optimization
POME
palm oil mill effluent
Trichoderma virens
Opis:
In this work, response surface optimization strategy was employed to enhance the biodegradation process of fresh palm oil mill effluent (POME) by Aspergillus niger and Trichoderma virens. A central composite design (CCD) combined with response surface methodology (RSM) were employed to study the effects of three independent variables: inoculum size (%), agitation rate (rpm) and temperature (°C) on the biodegradation processes and production of biosolids enriched with fungal biomass protein. The results achieved using A. niger were compared to those obtained using T. virens. The optimal conditions for the biodegradation processes in terms of total suspended solids (TSS), turbidity, chemical oxygen demand (COD), specific resistance to filtration (SRF) and production of biosolids enriched with fungal biomass protein in fresh POME treated with A. niger and T. virens have been predicted by multiple response optimization and verified experimentally at 19% (v/v) inoculum size, 100 rpm, 30.2°C and 5% (v/v) inoculum size, 100 rpm, 33.3°C respectively. As disclosed by ANOVA and response surface plots, the effects of inoculum size and agitation rate on fresh POME treatment process by both fungal strains were significant.
Źródło:
Archives of Environmental Protection; 2016, 42, 1; 63-73
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Natural filler based composite materials
Autorzy:
Nayeeif, A.A.
Hamdan, Z.K.
Metteb, Z.W.
Abdulla, F.A.
Jebur, N.A.
Powiązania:
https://bibliotekanauki.pl/articles/24200565.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
polyester resin
composite natural materials
tensile
bending
żywica poliestrowa
kompozytowe materiały naturalne
rozciąganie
gięcie
Opis:
Purpose: The first goal is to get rid of waste and reduce environmental pollution, and the other goal is to investigate the effect of these fibres on properties (resistance of composite materials for bending and tensile testing) of polyester and use them in applications. Also, The moisture environment effect on the properties of composite materials was studied. Design/methodology/approach: It uses natural fibres, which are considered waste, namely eggshell and sawdust with polyester. Several samples were prepared with different weight percentages (30% and 40%), and their mechanical properties were studied and immersed in water for 15 days. And studying the effect of water on these properties. It was found that it is possible to use these fibres (waste) with polyester and benefit from them. It was found that when adding fibres to polyester, the tensile strength decreases, but the bending increases the strength. Finally, it was found that when the samples are immersed in water, the material weakens, and its mechanical properties decrease. Findings: It can be noticed that adding natural fibres by 40% and 30% improved the mechanical properties of polyester in the bending test, where the bending test increased with increased volume fraction of fibre. It can be noticed that adding natural fibres by 40% and 30% decreased the mechanical properties (tensile strength) of polyester in a tensile test. When the natural composite materials were treated with water for 15 days, water decreased the mechanical properties in bending and tensile test. Research limitations/implications: One of the limitations of this research that was found through the work is that when increasing the weight ratios of the fibres added to polyester leads to the failure of polyester, so we recommend using lower weight ratios of fibre. Practical implications: One of the limitations of this research that was found through the work is that when increasing the weight ratios of the fibres added to polyester leads to the failure of polyester, so we recommend using lower weight ratios of fibre. Originality/value: The original value of this research is the use of fibres that are considered waste, their reuse, and utilization in some applications that do not require composite materials with high mechanical properties.
Źródło:
Archives of Materials Science and Engineering; 2022, 116, 1; 5--13
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A proposed preamble channel estimation scheme for flip FBMC-based indoor VLC systems
Autorzy:
El-Ganiny, Mohamed Y.
Khalaf, Ashraf A. M.
Hussein, Aziza I.
Hamed, Hesham F. A.
Powiązania:
https://bibliotekanauki.pl/articles/2063904.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
channel estimation
filter bank multicarrier
IEEE 802.15.7 standard
interference approximation method
visible light communication
Opis:
Filter bank multicarrier waveform is investigated as a potential waveform for visible light communication broadcasting systems. Imaginary inter-carrier and/or inter-symbol interference are causing substantial performance degradation in the filter bank multicarrier system. Direct current-biased optical filter bank multicarrier modulation overcomes all the problems of direct current-biased optical-orthogonal frequency division multiplexing modulation approaches in terms of speed and bandwidth. However, it also wastes a lot of energy while transforming a true bipolar signal into a positive unipolar signal by adding direct current-bias. In this paper, a flip-filter bank multicarrier-based visible light communication system was introduced to overcome this problem. In this system, a bipolar signal is converted to a unipolar signal by isolating the positive and negative parts, turning them to positive and then delivering the signal. Also, a new channel estimation scheme for a flip-filter bank multicarrier system is proposed which improves the channel estimation performance compared to that of each of the conventional schemes. The proposed system performance is measured in terms of bit error rate, normalized mean squared error, and constellation diagram. The superiority of the proposed scheme over other conventional structures has been successfully verified by MATLAB 2020b simulation experiments results. These results are evaluated under indoor visible light communication standard.
Źródło:
Opto-Electronics Review; 2022, 30, 1; art. no. e140859
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ doustnego podania chlorku glinu na transport jelitowy leucyny i metioniny (badania in vivo)
Influence of per os administration of aluminium chloride on intestinal transport of leucine and methionine
Autorzy:
Sedrowicz, L.W.
Oledzka, R.
van der Voet, G.B.
de Wolff, F.A.
Powiązania:
https://bibliotekanauki.pl/articles/873427.pdf
Data publikacji:
1993
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Źródło:
Roczniki Państwowego Zakładu Higieny; 1993, 44, 1
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Socio-economic factors influencing adoption of Moringa oleifera water purification by farmers in Kaduna state, Nigeria
Autorzy:
Fadoyin, A.S.
Oyewole, S.O.
Ayanrinde, F.A.
Baba, G.A.
Erhabor, T.A.
Powiązania:
https://bibliotekanauki.pl/articles/11765.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
This study investigated those factors which influenced the adoption of Moringa olefera as water purifier by the farmers in Kaduna state. Data were collected with the aid of structured questionnaire from 30 respondents. The data were analyzed using descriptive statistics and logit regression model. The results showed that the respondents had one form of education or the other. About 90 percent were married average household size of 10 persons per household. About 73 percent adopted Moringa oleifera water purification. Socio-economic factors influencing adoption of Moringa oleifera water purification were age, education, extension contact and membership of cooperative. The study therefore recommends that farmers should form themselves into association because such association will aid in collective soliciting for government assistance, NGOs and other funding agencies. Also, more awareness should be created by the extension agents on the importance of Moringa oleifera seed powder in rural development.
Źródło:
International Letters of Natural Sciences; 2014, 15, 1
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of biomechanics of skull structures damages caused by dynamic loads
Autorzy:
Ptak, M.
Ratajczak, M.
Kwiatkowski, A.
Sawicki, M.
Wilhelm, J.
Fernandes, F. A. O.
Druszcz, A.
Powiązania:
https://bibliotekanauki.pl/articles/306216.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
czaszka
urazy
biomechanika
FEM
skull fracture
biomechanics
cranial sutures
vulnerable road user
finite element method
Opis:
The aim of the study was to examine the influence of cranial sutures on the crack behaviour of a human skull after the impact. The authors focused on the assessment of skull breaking nature, based on a real-world vehicle-to-bicyclist accident. In the state of the art, there is still no consensus about sutures mechanical properties. Currently, most of the numerical head models do not have distinguished cranial sutures. Methods: The authors compared different elastic properties for cranial sutures and their influence on the nature of the skull fracture. The mathematical and numerical modelling have been applied to mimic the nature of the skull fracture. The LS-DYNA explicit code with material models featuring the erosion of finite elements was used. The models of the skull with different cranial sutures properties were impacted against a validated front-end of a vehicle. Results: Various fracture patterns were obtained for different material properties of the sutures and the results were compared to a model without the cranial sutures. Based on the results, a graph was plotted to indicate differences in sutures energy absorption capabilities. The numerical results were supported by the mathematical modelling. The developed diagram may enable better understanding of the complex mechanical phenomena on the suture interface. Conclusions: Biomechanical evidence was provided for the important role of the sutures in numerical models as well as their significant influence on the biomechanics of skull fractures caused by dynamic loads.
Źródło:
Acta of Bioengineering and Biomechanics; 2018, 20, 4; 143-150
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hybrid PAPR reduction schemes for different OFDM-based VLC systems
Autorzy:
El-Ganiny, Mohamed Y.
Khalaf, Ashraf A. M.
Hussein, Aziza I.
Hamed, Hesham F. A.
Powiązania:
https://bibliotekanauki.pl/articles/2174839.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
visible light communication
peak-to-average power ratio
bit error rate
Opis:
Orthogonal frequency division multiplexing has been widely used in many radio frequency wireless communication standards as a preferable multicarrier modulation scheme. The modulated signals of a conventional orthogonal frequency division multiplexing system are complex and bipolar. In intensity-modulated direct detection optical wireless communications, transmitted signals should be real and unipolar due to non-coherent emissions of an optical light emitting diode. In this paper, different hybrid optical systems have been proposed to satisfy real and unipolar signals. Peak-to-average power ratio is one of the biggest challenges for orthogonal frequency division multiplexing-based visible light communications. They are based on a combination of non-linear companding techniques with spreading or precoding techniques. Simulation evaluation is performed under direct current-biased optical orthogonal frequency division multiplexing, asymmetrically clipped optical orthogonal frequency division multiplexing, and Flip-orthogonal frequency division multiplexing systems in terms of peak-to-average power ratio, bit error rate, and spectral efficiency. The proposed schemes are investigated to determine a scheme with a low peak-to-average power ratio and an acceptable bit error rate. MATLABTM software has been successfully used to show the validity of the proposed schemes.
Źródło:
Opto-Electronics Review; 2022, 30, 3; art. no. e141951
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hybrid PAPR reduction schemes for different OFDM-based VLC systems
Autorzy:
El-Ganiny, Mohamed Y.
Khalaf, Ashraf A. M.
Hussein, Aziza I.
Hamed, Hesham F. A.
Powiązania:
https://bibliotekanauki.pl/articles/2174840.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
visible light communication
peak-to-average power ratio
bit error rate
Opis:
Orthogonal frequency division multiplexing has been widely used in many radio frequency wireless communication standards as a preferable multicarrier modulation scheme. The modulated signals of a conventional orthogonal frequency division multiplexing system are complex and bipolar. In intensity-modulated direct detection optical wireless communications, transmitted signals should be real and unipolar due to non-coherent emissions of an optical light emitting diode. In this paper, different hybrid optical systems have been proposed to satisfy real and unipolar signals. Peak-to-average power ratio is one of the biggest challenges for orthogonal frequency division multiplexing-based visible light communications. They are based on a combination of non-linear companding techniques with spreading or precoding techniques. Simulation evaluation is performed under direct current-biased optical orthogonal frequency division multiplexing, asymmetrically clipped optical orthogonal frequency division multiplexing, and Flip-orthogonal frequency division multiplexing systems in terms of peak-to-average power ratio, bit error rate, and spectral efficiency. The proposed schemes are investigated to determine a scheme with a low peak-to-average power ratio and an acceptable bit error rate. MATLABTM software has been successfully used to show the validity of the proposed schemes.
Źródło:
Opto-Electronics Review; 2022, 30, 3; art. no. e141951
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of fungal DNA templates and PCR amplification yield by three types of nanoparticles
Autorzy:
Al-Dhabaan, F.A.
Yousef, H.
Shoala, T.
Shaheen, J.
El Sawi, Y.
Farag, T.
Powiązania:
https://bibliotekanauki.pl/articles/65369.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
plant pathology
detection
identification
plant pathogen
toxigenic fungi
improvement
specificity
efficiency
polymerase chain reaction
Alternaria alternata
DNA extraction
nanoparticle
Rhizoctonia solani
nanobiotechnology
Opis:
Nanodiagonastic methods in plant pathology are used for enhancing detection and identification of different plant pathogens and toxigenic fungi. Improvement of the specificity and efficiency of the polymerase chain reaction (PCR) by using some nanoparticles is emerging as a new area of research. In the current research, silver, zinc, and gold nanoparticles were used to increase the yield of DNA for two plant pathogenic fungi including soil-borne fungus Rhizoctonia solani and toxigenic fungus Alternaria alternata. Gold nanoparticles combined with zinc and silver nanoparticles enhanced both DNA yield and PCR products compared to DNA extraction methods with ALB buffer, sodium dodecyl sulfate, ALBfree from protinase K, ZnNPs and AgNPs. Also, by using ZnNPs and AgNPs the DNA yield was enhanced and the sensitivity of random amplified polymorphic DNA (RAPD) PCR products was increased. Application of nanomaterials in the PCR reaction could increase or decrease the PCR product according to the type of applied nanometal and the type of DNA template. Additions of AuNPs to PCR mix increased both sensitivity and specificity for PCR products of the tested fungi. Thus, the use of these highly stable, commercially available and inexpensive inorganic nano reagents open new opportunities for improving the specificity and sensitivity of PCR amplicon, which is the most important standard method in molecular plant pathology and mycotoxicology.
Źródło:
Journal of Plant Protection Research; 2018, 58, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simultaneous measurement of evaporating fuel spray using laser induced exciplex fluorescence
Autorzy:
Martine--Martínez, S.
Sánchez-Cruz, F. A
Rodríguez-Morales, G.
Riesco-Ávila, J. M.
Gallegos-Munoz, A.
Powiązania:
https://bibliotekanauki.pl/articles/243044.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
thermal engine
direct injection
liquid phase
vapour phase
penetration length
Opis:
A macroscopic analysis of experimental measurements offuel sprays penetration on evaporating conditions using the Laser Induced Fluorescence Planar technique is presented. A pure fuel and tracers have been used to determine the two-phase process of the spray by characterizing the wavelengths they display when excited by a laser beam. An experimental set-up based on a single cylinder engine [1, 2], an Nd:YAG laser, an image acquisition system and a system of injection common rail have been used to carry out the experimental processes. Experimental results show the behaviour of the vapour phase and liquid phase in the spray under different thermodynamic conditions and injection parameters in the combustion chamber, particularly the work-fluid density and the injection pressure were observed. The measurement of these parameters is of interest to design the combustion chamber geometry and the piston bowl features of modern direct injection Diesel engines. In particularly, the sschematic diagram and main components of the equipment, cross-sectional view of the cylinder head, experimental layout of PLIEF imaging tests and images, examples of the liquid phase and vapour phase penetration, maximum penetration of the liquid and vapour phase as function of the work fluid density, Maximum penetration of the phase as function of the work fluid density, maximum penetration of the liquid and vapour phase as function of the injection pressure are presented in the paper.
Źródło:
Journal of KONES; 2007, 14, 2; 315-326
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Algorithms and methods for analysis of the optical structure factor of fractal aggregates
Autorzy:
Mroczka, J.
Woźniak, M.
Onofri, F. R. A.
Powiązania:
https://bibliotekanauki.pl/articles/221757.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fractals
aggregates
light scattering
scattering diagrams
structure factor
Opis:
We introduce numerical methods and algorithms to estimate the main parameters of fractal-like particle aggregates from their optical structure factor (i.e. light scattering diagrams). The first algorithm is based on a direct and simple method, but its applicability is limited to aggregates with large size parameter and intermediate fractal dimension. The second algorithm requires to build calibration curves based on accurate particle agglomeration and particle light scattering models. It allows analyzing the optical structure factor of much smaller aggregates, regardless of their fractal dimension and the size of the single particles. Therefore, this algorithm as well as the introduction of a criteria curve to detect the different scattering regimes, are thought to be powerful tools to perform reliable and reproducible analyses.
Źródło:
Metrology and Measurement Systems; 2012, 19, 3; 459-470
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CFD analysis of the effect of the exhaust manifold design on the close-coupled catalytic converter performance
Autorzy:
Martinez-Martinez, S.
Leal-Garza, R. D.
Sanchez-Cruz, F. A.
Villarreal, E. B.
Amado-Covarrubias, M.
Powiązania:
https://bibliotekanauki.pl/articles/247790.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
Close-Coupled Catalytic Converter
Exhaust Manifold
flow uniformity
pressure drop
Opis:
It is a common practice to mount a catalytic converter directly at the outlet of the exhaust manifold in order to reduce the cold start emissions from the automotive engines by improving the light-off time. The so called Close-Coupled Converter, because of its nearness to the engine, is more exposed to non-uniform fluid flows comingfrom the individual manifold runners, what frequently yields a stream of gases flowing mainly through a section of the monolith causing the aging of the catalyst and low conversion efficiency, among other negative effects. Computational Fluid Dynamics (CFD) has became a very useful and widely used tool to analyze and optimize this kind of exhaust after-treatment systems in a relatively fast and accurate way for design purposes. There are several designs of exhaust manifolds whose shape and dimensions are mainly restricted not only by the engine characteristics but by the space constraints of the particular vehicles they are designedfor. In this work the commercial CFD code ANSYS FLUENT was used to evaluate and compare the effect of three shapes of exhaust manifolds on the fluid flow uniformity at the entrance of the Close-Coupled Converter. Pressure drop in the entire Manifold-Converter device is also an important parameter considered for the design evaluation. The manifolds investigated are of type cast, 4-2-1 and L-shaped, which are commonly used in the automotive industry.
Źródło:
Journal of KONES; 2010, 17, 4; 303-311
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Welding Effects on the Mechanical Integrity of a Trip800 Steel: a Comparison of Laser Co2 and Gmaw Processes
Wpływ spawania na integralność mechanicznaą stali Trip800: porównanie spawania laserowego ze spawaniem elektrodą topliwą
Autorzy:
Perez-Medina, G. Y.
Lopez, H. F.
Reyes-Valdes, F. A.
Garza-Gomez, A.
Lopez-Ochoa, L. M.
Powiązania:
https://bibliotekanauki.pl/articles/351511.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laser
GMAW
retained austenite
color metallography
spawanie elektrodą topliwą
austenit resztkowy
metalografia barwna
Opis:
In this work a strip of a transformation induced plasticity (TRIP) steel was welded using gas metal arc welding (GMAW) and Laser CO2 welding (LBW) processes and the resultant strength and ductility of the welded joints evaluated. It was found that LBW lead to relatively high hardness in the fusion zone, FZ where the resultant microstructure was predominantly martensite. The relative volume fractions of phases developed in the welded regions were quantitatively measured using color metallography combined with X-ray diffraction analyses. It was found that the heat affected zone, HAZ developed the maximum amount of martensite (up to 32%) in the steel welded using LBW besides a mixture of bainite, retained austenite and ferrite phases. In contrast, a relatively low percent of martensite (10.8%) was found in the HAZ when the GMAW process was implemented.
Pas ze stali typu TRIP poddano spawaniu elektrodą topliwą oraz spawaniu laserowemu i oceniono wytrzymałość i plastyczność uzyskanych połączeń spawanych. Stwierdzono, że spawanie laserowe prowadzi do uzyskania stosunkowo wysokiej twardości w strefie łączenia, gdzie powstała mikrostrukturę stanowi głównie martenzyt. Względne udziały objętościowe faz w spawanych obszarach zmierzono ilościowo za pomocą barwnej metalografii w połączeniu z dyfrakcyjną analizą rentgenowską. Stwierdzono, że w przypadku stali spawanej laserowo strefa wpływu ciepła zawiera najwięcej martenzytu (do 32%), a oprócz tego mieszanine bainitu, resztkowego austenitu i ferrytu. Natomiast w strefie wpływu ciepła uzyskanej podczas spawania elektrodą topliwą stwierdzono stosunkowo niską zawartość martenzytu (10,8%).
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 4; 1427-1432
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of combined ethanol extract of Funtumia africana and Abutilon mauritianum leaves (FAAM) on liver function indices of benign prostatic hyperplasia (BPH) induced rats
Autorzy:
Uroko, R.I.
Adamude, F.A.
Egba, S.I.
Chukwu, C.N.
Asadu, C.L.
Okwara, E.C.
Powiązania:
https://bibliotekanauki.pl/articles/2049077.pdf
Data publikacji:
2020
Wydawca:
Instytut Włókien Naturalnych i Roślin Zielarskich
Tematy:
Funtumia africana
Abutilon mauritianum
liver marker enzymes
liver function indices
benign prostatic hyperplasia
enzymy wątrobowe
wskaźniki wątrobowe
łagodny przerost gruczołu krokowego
Opis:
Objective: This study evaluated the effects of combined ethanol extract of Funtumia africana and Abutilon mauritianum leaves (FAAM) on the liver function indices of benign prostatic hyperplasia (BPH) induced rats. Materials and Methods: The study used 30 rats divided into 5 groups, comprising normal control, BPH control, standard control, and BPH induced rats treated with 200 and 600 mg/kg/day of FAAM respectively. Results: The BPH induction caused significant (p<0.05) increases in aspartate transaminase (AST) and alkaline phosphatase (ALP) activities of the BPH control when compared with the normal control. The BPH control also had significantly (p<0.05) reductions in the total protein, albumin and globulin concentrations and significant (p<0.05) elevated total bilirubin and direct bilirubin concentrations relative to the normal control. The FAAM treated BPH-induced rats had non-significantly (p>0.05) reduced AST, and alanine transaminase (ALT) activities relative to the BPH control. The BPH-induced rats treated with 600 mg/kg/day of FAAM had significantly (p<0.05) reduced ALP activities relative to the BPH control. Treatment with FAAM caused significant (p<0.05) increases in the total protein, albumin, globulin concentrations and significant (p<0.05) reductions in the total bilirubin and direct bilirubin concentrations relative to the BPH control. BPH had no observable adverse effects on the liver histomorphology of the rats. Conclusion: The findings of this study indicated that BPH impairs liver functions and treatment of BPH with combined ethanol extract of F. africana and A. mauritianum leaves restore normal liver functions in rats with BPH.
Źródło:
Herba Polonica; 2020, 66, 3; 24-35
0018-0599
Pojawia się w:
Herba Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of pathogenic bacteria in wastewater using conventional and PCR techniques
Autorzy:
El-Lathy, A. M.
El-Taweel, G. E.
El-Sonosy, M. W.
Samhan, F. A.
Moussa, T. A. A.
Powiązania:
https://bibliotekanauki.pl/articles/363166.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
Listeria
technika MPN
Salmonella
technika płyt powierzchniowych
całkowita ilość komórek vibrio
MPN technique
surface plate technique
total vibrios
Opis:
The objectives of this investigation were to detect and determine some pathogenic bacteria in raw and treated wastewater and to compare and evaluate different techniques. To achieve this aim, pathogenic bacteria (salmonellae group, total vibrios and Listeria group) were determined in 30 samples collected from inlet and outlet of the treatment plants using PCR, MPN and surface plate techniques. The results of salmonellae group showed that all 30 samples (100%) were positive using PCR technique, 28 samples (about 93%) were positive using direct surface plate technique, and 27 samples (90%) were positive using MPN technique. In case of total vibrios 27 samples (90%) were positive using direct surface plate technique while 28 samples (93%) were positive using MPN technique.When using multiplex PCR technique, detection of three species of Vibrio (V. vulnificus, V. parahaemolyticus, V. cholerae and Classical or El-Tor) were negative. Listeria group was detected in 29 samples (97%) using PCR technique, in 28 samples (93%) using surface plate technique, and in 27 samples (90%) using MPN technique. The removal percentages showed that oxidation pond of El-Sadat City is more efficient in removal of these pathogenic bacteria than the activated sludge system. Statistical analysis (Student t-test) showed that there were significant differences between MPN and surface plate techniques in revealing the three selected pathogenic groups.
Źródło:
Environmental Biotechnology; 2009, 5, 2; 73-80
1734-4964
Pojawia się w:
Environmental Biotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of neem leaf (Azadirachta indica) meal on growth performance and haematology of rabbits
Autorzy:
Unigwe, C. R.
Balogun, F. A.
Okorafor, U. P.
Odah, I. S.
Abonyi, F. O.
Olona, J. F.
Powiązania:
https://bibliotekanauki.pl/articles/1192593.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Rabbits
Neem leaf meal
growth performance
haematology
feed conversion ratio
Opis:
A ten-week experiment using twenty four (24) weaner rabbits (Chinchila x New Zealand White) aged 8 to 9 weeks with an average initial body weight of 431.20+0.74g were randomly allocated to four treatment diets of T1(control), T2(5% NLM), T3(10% NLM) and T4(15% NLM) in a completely randomized design. They were fed for 10 weeks during which data on growth and haematology were collected and analysed using analysis of variance (ANOVA) and means separated using Duncan Multiple Range Test. The results showed that the average total body weight gains were 739.60g (T1), 717.85g (T2), 740.18g (T3) and 729.45g (T4).There was no significant difference (p>0.05) when T1 and T3 as well as T2 and T4 were compared but significant (p<0.05) when T1 and T2 as well as T3 and T4 were compared. Also the average weekly feed intake showed that T1, T2, T3 and T4 consumed 313.91g, 313.24g, 312.48g and 314.69g respectively. However, there was significant difference (p<0.05) when all the treatments were compared in this respect. The feed conversion ratio (FCR) showed that T3 (4.22) was the best followed by T1 (4.24), T4 (4.31) and T2(4.36) with significant differences (p<0.05) among them except (p>0.05) between T1 and T3. The haematological indices showed that though all the parameters fell within the normal physiologic ranges, the PCV was 37.62% (T1), 38.42% (T2), 39.60% (T3) and 39.03% (T4) and when compared, were all significantly different (p<0.05) except (P>0.05) for T3 and T4 while the haemoglobin concentration showed that T1(13.47g/dl) was significantly different (p<0.05) from T2(14.18g/dl), T3(14.34g/dl), and T4(13.97g/dl). The white blood cell count showed that T3 (10.62 x109/L) had the highest value followed by T1 (10.12 x109/L), T4 (9.34 x109/L) and T2 (9.18 x109/L) with a significant difference (p<0.05) occurring when T1 and T3 were compared to T2 and T4 while the red blood cell counts indicated that T1 had the highest value of 4.92 x106/L followed by T3(4.89 x106/L), T2(4.73 x106/L) and T4(4.65 x106/L) without any significant difference among the treatments. All the values fell within the normal range. It is therefore recommended that inclusion of neem leaf meal in the diets of rabbits up to 10% is not detrimental since it improved feed conversion ratio (FCR), growth performance and had no negative effect on haematological values.
Źródło:
World Scientific News; 2016, 55; 51-62
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coal fly ash supported nZnO for the sorption of triphenyltin chloride
Autorzy:
Ayanda, O. S.
Fatoki, O. S.
Adekola, F. A.
Ximba, B. J.
Akinsoji, O. S.
Petrik, L. F.
Powiązania:
https://bibliotekanauki.pl/articles/204751.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
organotin compounds
triphenyltin
coal fly ash
nZnO
composite
marine
shipyard process
wastewater
seawater
adsorption
Opis:
A laboratory study was performed to study the effects of various operating factors, viz. adsorbent dose, contact time, solution pH, stirring speed, initial concentration and temperature on the adsorption of triphenyltin chloride (TPT) onto coal fly ash supported nZnO (CFAZ). The adsorption capacity increases with increase in the adsorbent amount, contact time, pH, stirring speed and initial TPT concentration, and decrease with increase in the solution temperature. The adsorption data have been analyzed by Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R) adsorption models to determine the mechanistic parameters associated with the adsorption process while the kinetic data were analyzed by pseudo first-order, pseudo second-order, Elovich, fractional power and intraparticle diffusivity kinetic models. The thermodynamic parameters of the process were also determined. The results of this study show that 0.5 g of CFAZ was able to remove up to 99.60% of TPT from contaminated natural seawater at 60 min contact time, stirring speed of 200 rpm and at a pH of 8. It was also found that the equilibrium and kinetic data fitted better to Freundlich and pseudo second-order models, respectively. It can therefore be concluded that CFAZ can be effectively used for shipyard process wastewater treatment.
Źródło:
Archives of Environmental Protection; 2015, 41, 1; 59-71
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Operating conditions effect over the coupling strength for urban aerial ropeways
Warunki eksploatacji mające wpływ na wytrzymałość miejskich kolei linowych
Autorzy:
Martinod, R. M
Estepa, D
Paris, C. E
Pineda, F. A.
Restrepo, J. L.
Castaneda, L. F
Mejia, G. A.
Powiązania:
https://bibliotekanauki.pl/articles/374326.pdf
Data publikacji:
2014
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
ropeways
cable car
funicular
safety transport
strain gage
koleje linowe
kolejka linowa
kolej linowo-terenowa
bezpieczeństwo transportu
Opis:
The present work is aimed to assess the operating conditions effect for urban aerial ropeways with a commercial usage, based on measurements obtained from an arrangement of sensors that record the coupling assembly behavior between the detachable gondola pod and the track rope. The work pays particular attention to the effect caused by external conditions due to the wind loads joined up with other parasite external effects, through the measurement of the engage strains. The cableway gondola continuous cycle has mono-cable of simple ring type.
Niniejszy artykuł ma na celu ocenę efektywnych warunków pracy dla miejskich napowietrznych kolei linowych z praktyką przemysłową na podstawie pomiarów uzyskanych z układem czujników, które rejestrują zachowanie gondoli w trakcie procesu wyprzęgania jej z liny. W artykule zwrócono szczególną uwagę na wpływ warunków zewnętrznych spowodowanych przez obciążenia wiatrem z dołączeniem innych obciążeń zewnętrznych przez pomiar naprężeń w trakcie wprzęgania. Kolej gondolowa jednolinowa ma pojedynczą linę prostego typu pierścieniowego.
Źródło:
Transport Problems; 2014, 9, 3; 5-14
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmental distribution of post-Palaeozoic crinoids from the Iberian and south-Pyrenean basins, NE Spain
Autorzy:
Zamora, S.
Aurell, M.
Veitch, M.
Saulsbury, J.
Lopez-Horgue, M.A.
Ferratges, F.A.
Arz, J.A.
Baumiller, T.K.
Powiązania:
https://bibliotekanauki.pl/articles/22586.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
Post-Palaeozoic crinoids from northeast Spain ranging from the Ladinian (Middle Triassic) to the Ilerdian (lower Ypresian, early Eocene) are documented. Here we provide the first attempt to reconstruct the environmental distribution of these crinoids based on relatively complete material (mostly cups). Triassic forms are dominated by encrinids from outer carbonate ramps. Late Jurassic crinoids are dominated by cyrtocrinids, comatulids, millericrinids, and isocrinids, occurring either on sponge mounds and meadows or on soft substrates within middle to outer carbonate ramps. Aptian (Early Cretaceous) forms include nearly complete isocrinids which are found in extremely shallow environments represented by bioclastic carbonates and interspersed oyster-rich layers. Other Aptian occurrences come from more distal and deep environments and are composed solely of comatulids. Albian forms are dominated by cyrtocrinids and isocrinids associated with coral reefs. Late Cretaceous and Eocene crinoids include mostly bourgueticrinids (Comatulida) that are found either in outer ramp facies or associated with mid-ramp reef complexes. The later corresponds to one of the shallowest occurrence of bourgueticrinids in the Cenozoic. The palaeoecological data for fossil crinoids of northeast Spain contributes to reconstructing the history of the bathymetric distribution of articulate crinoids, supporting the idea that stalked crinoids were able to inhabit a wide range of shallow marine environments in the late Mesozoic and early Cenozoic.
Źródło:
Acta Palaeontologica Polonica; 2018, 63, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical characteristics of grains of maize pre-sowing treated by electromagnetic fields
Cechy fizyczne ziarna kukurydzy z roślin poddanych działaniu pola elektromagnetycznego przed siewem
Autorzy:
Cruz, D.G.
Bautista, R.Z.
Aguilar, C.H.
Pacheco, F.A.D.
Orea, A.C.
Bonilla, J.L.L.
Powiązania:
https://bibliotekanauki.pl/articles/35522.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
physical characteristics
grain
maize grain
pre-sowing treatment
electromagnetic field
Zea mays
food quality
Opis:
Electromagnetic fields have many applications in agriculture, but much still remains to be studied to provide scientific evidence of its potential use as an alternative for improvement of food quality from plants whose seed was irradiated, especially in the physical characteristics of the product. In this study we investigated the effects of the electromagnetic fields on the physical quality of maize grain. Twelve treatments were evaluated from a combination of two maize hybrids (San Juan and San Jose) and five times of exposure to electromagnetic field (3, 6, 9, 12 and 15 minutes) plus a control (no electromagnetic treatment) in a design of randomised complete blocks with four replications. Electromagnetic treatment of the hybrid maize seeds (San Juan and San Jose), applied as a presowing treatment, modifies the physical characteristics of maize grains. It was possible to observe that there were significant differences (p≤0.01) between the experimental treatments and between the hybrids in their grain length (LG), grain width (GW) and 1000-grain weight (TGW). The hectolitric weight (HW) of the hybrids was between 69.05 and 68.98 kg hL-1, respectively. These results could have an impact on the process and quality of the tortilla that is consumed by the population; this is a function of time of exposure to electromagnetic treatment.
Pola elektromagnetyczne mają wiele zastosowań w rolnictwie, lecz konieczne są dalsze badania aby uzyskać naukowe dowody na ich potencjalne wykorzystanie jako alternatywnej metody poprawy jakości żywności otrzymywanej z roślin, których nasiona poddano ich wpływowi – szczególnie w odniesieniu do ich cech fizycznych. W prezentowanej pracy badano wpływ pola elektromagnetycznego na fizyczne cechy ziarna kukurydzy. Badania obejmowały dwanaście kombinacji – dwie hybrydy kukurydzy (San Juan and San Jose) i pięć czasów działania polem elektromagnetycznym (3, 6, 9, 12 i 15 minut) plus kombinacja kontrolna (nasiona bez traktowania polem elektromagnetycznym). Doświadczenie założono metodą bloków losowych w czterech powtórzeniach. Przedsiewne działanie polem elektromagnetycznym na nasiona hybryd kukurydzy (San Juan and San Jose) modyfikuje cechy fizyczne otrzymanego ziarna. Zaobserwowano istotne różnice (p≤0,01) pomiędzy wariantami doświadczenia oraz pomiędzy hybrydami kukurydzy w takich cechach jak długość ziaren (LG), szerokość (GW) i masa 1000 ziaren (TGW). Masa hektolitrowa (HW) ziarna tych hybryd zawierała się w przedziale od 69,05 do 68,98 kg hL-1. Otrzymane wyniki mogą mieć znaczenie w procesie produkcji oraz jakości tortilli.
Źródło:
Acta Agrophysica; 2011, 18, 1[192]
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of smart sorting machine using artificial intelligence for chili fertigation industries
Autorzy:
Abdul Aziz, M. F.
Bukhari, W. M.
Sukhaimie, M. N.
Izzuddin, T.A.
Norasikin, M.A.
Rasid, A. F. A.
Bazilah, N. F.
Powiązania:
https://bibliotekanauki.pl/articles/2141810.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
precision agriculture
artificial neural network
smart fertigation
Opis:
This paper presents an automation process is a need in the agricultural industry specifically chili crops, that implemented image processing techniques and classification of chili crops usually based on their color, shape, and texture. The goal of this study was to develop a portable sorting machine that will be able to segregate chili based on their color by using Artificial Neural Network (ANN) and to analyze the performance by using the Plot Confusion method. A sample of ten green chili images and ten red chili images was trained by using Learning Algorithm in MATLAB program that included a feature extraction process and tested by comparing the performance with a larger dataset, which are 40 samples of chili images. The trained network from 20 samples produced an overall accuracy of 80 percent and above, while the trained network from 40 samples produced an overall accuracy of 85 percent. These results indicate the importance of further study as the design of the smart sorting machine was general enough to be used in the agricultural industry that requires a high volume of chili crops and with other differentiating features to be processed at the same time. Improvements can be made to the sorting system but will come at a higher price.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2021, 15, 4; 44-52
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control of natural mycobiota in maize grains by ultraviolet (UVC) irradiation
Zwalczanie naturalnych mikobiot w ziarnie kukurydzy za pomocą promieniowania ultrafioletowego (UVC)
Autorzy:
Paez, C.L.R.
Reyes, M.C.P.
Aguilar, C.H.
Pacheco, F.A.D.
Martinez, E.M.
Orea, A.C.
Bonilla, J.L.L.
Powiązania:
https://bibliotekanauki.pl/articles/36667.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
natural mycobiota
mycobiota
fungi
control
maize grain
Zea mays
ultraviolet irradiation
Opis:
The effect of UV-C light as a means of control of natural mycobiota of grains of maize (Zea mays L.) hybrids “San Juan” and ”H-159” (productive cycle, 2009) was investigated. UV-C lamps of 15 W were used and the exposure times applied were 0, 5, 10, 15, 20, 25 and 30 min. The experiment was established in the randomised complete block design with eight and four replicates. The unit pilot was 50 grains. For the determination of mycobiota the agar plate test was used, after disinfection of the grains with sodium hypochlorite diluted to 3% for 1 min. Differences (P ≤ 0.001, P ≤ 0.05) between treatments were found, the best treatments being those of 30 and 10 min, observing reductions of 42.85 and 52.05% in the number of grains infected with Fusarium spp. with respect to control for “San Juan” and “H-159”, respectively. For Fusarium monoliforme it was found that in 30 min there was a reduction of 53.74% for the hybrid “San Juan”, while for H-159 a reduction of 61.7% in 10 minutes was observed. These results show that UV-C radiation may be useful for application as a germicide in future experiments on a wide variety of grains.
Badano wykorzystanie promieniowania UV-C jako metody zwalczania naturalnych mikobiot ziarna hybryd kukurydzy (Zea mays L.) “San Juan” i ”H-159” (cykl produkcyjny, 2009). Zastosowano lampy UV-C o mocy 15 W, a czasy ekspozycji wynosiły 0, 5, 10, 15, 20, 25 oraz 30 min. Doświadczenie założono metodą kompletnych bloków randomizowanych w ośmiu i czterech powtórzeniach. Jednostka pilotażowa wynosiła 50 ziaren. Dla określenia mikobiot zastosowano test agarowy po uprzedniej dezynfekcji ziarna 3% roztworem podchlorynu sodu przez 1 min. Stwierdzono różnice (P ≤ 0,001, P ≤ 0,05) pomiędzy obiektami doświadczenia. Najlepsze wyniki uzyskano dla czasów ekspozycji 30 i 10 min, uzyskując odpowiednio 42,85 oraz 52,05% redukcję ilości ziaren zakażonych Fusarium spp. dla ziarna hybryd “San Juan” i “H-159” w odniesieniu do kontroli. W odniesieniu do Fusarium monoliforme stwierdzono, że po czasie naświetlania 30 min nastąpiła redukcja o 53,74% dla hybrydy “San Juan”, a dla H-159 stwierdzono spadek o 61,7% po 10 minutach. Te wyniki wykazują, że promieniowanie UV-C może być użyteczne do stosowania jako zabieg zarodnikobójczy w przyszłych doświadczeniach na rożnych rodzajach ziarna.
Źródło:
Acta Agrophysica; 2011, 18, 2[193]
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in masa and tortillas obtained from maize irradiated and nixtamalized with nejayote
Autorzy:
Valderrama-Bravo, C.
Domínguez-Pacheco, F.A.
Hernandez-Aguilar, C.
Sanchez-Hernandez, G.
Perez-Reyes, C.
Contreras-Padilla, M.
Rojas-Gonzalez, T.
Oaxaca-Luna, A.
Powiązania:
https://bibliotekanauki.pl/articles/24252.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Źródło:
International Agrophysics; 2018, 32, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metric for calculation of system complexity based on its connections
Autorzy:
Paiva, J. R. B.
Gomes, V. M.
Rodrigues, B. A.
Silva, L. F. A.
Aniceto, B. C. M.
Furriel, G. P.
Calixto, W. P.
Powiązania:
https://bibliotekanauki.pl/articles/136166.pdf
Data publikacji:
2017
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
complexity
connections
modeling
simulation
discrete event systems
Opis:
This paper proposes a methodology based on system connections to calculate its complexity. Two study cases are proposed: the dining Chinese philosophers’ problem and the distribution center. Both studies are modeled using the theory of Discrete Event Systems and simulations in different contexts were performed in order to measure their complexities. The obtained results present i) the static complexity as a limiting factor for the dynamic complexity, ii) the lowest cost in terms of complexity for each unit of measure of the system performance and iii) the output sensitivity to the input parameters. The associated complexity and performance measures aggregate knowledge about the system.
Źródło:
Transactions on Environment and Electrical Engineering; 2017, 2, 1; 67-73
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proposal of heuristic regression method applied in descriptive data analysis: case studies
Autorzy:
Gomes, F. A.
Assis, A. de O.
Reis, M. R. da C.
Gomes, V. M.
Oliveira, S. G. M.
Araujo, W. R. H. de
Calixto, W. P.
Powiązania:
https://bibliotekanauki.pl/articles/136229.pdf
Data publikacji:
2017
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
regression
data analysis
optimization
heuristic
modeling
Opis:
The purpose of this paper is to use the hybridized optimization method in order to find mathematical structures for analysis of experimental data. The heuristic optimization method will be hybridized with deterministic optimization method in order to that structures found require not knowledge about data generated experimentally. Five case studies are proposed and discussed to validate the results. The proposed method has viable solution for the analysis of experimental data and extrapolation, with mathematical expression reduced.
Źródło:
Transactions on Environment and Electrical Engineering; 2017, 2, 2; 51-57
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determinats of Reinvestment Allowance (RA) tax incentive utilization in embracing Industry 4.0
Czynniki wykorzystania inicjatywy inwestycyjnej ulgi podatkowej (RA) w adopcji Przemysłu 4.0
Autorzy:
Hamid, N. A.
Hamzah, F. H. A.
Noor, R. M.
Azali, N. M.
Powiązania:
https://bibliotekanauki.pl/articles/405389.pdf
Data publikacji:
2018
Wydawca:
Politechnika Częstochowska
Tematy:
tax incentive
reinvestment allowance
RA
tax return data
Industry 4.0
zachęta podatkowa
zasiłek reinwestycyjny
dane dotyczące zwrotu podatku
Przemysł 4.0
Opis:
In the era of automation, Malaysia is compelled to embrace Industry 4.0 in order to remain competitive. Thus, the nation needs to be better prepared to confront the challenges ahead. From the perspective of taxation, the government has crafted many tax incentives such as Reinvestment Allowance (RA) to stimulate business expansion, automation, modernization, and diversification. The aim of this paper is to determine the factors affecting the utilization of RA among incentivised firms in Malaysia. Confidential tax return data was analysed using binomial logistic regression and the results confirmed that there are connections between firm profitability, investment, sector, and effective tax rate with the utilization of RA. Thus, by focusing on the potential determinants in RA utilization, it will benefit both policy makers and industry players to enhance effective application of RA that was designed to support Industry 4.0.
W dobie automatyzacji, Malezja jest zmuszona zaadoptować Przemysł 4.0, aby pozostać konkurencyjnym. W związku z tym naród musi być lepiej przygotowany do stawienia czoła stojącym przed nim wyzwaniom. Z punktu widzenia opodatkowania, rząd opracował wiele zachęt podatkowych, takich jak zasiłek reinwestycyjny (RA), aby stymulować ekspansję biznesu, automatyzację, modernizację i dywersyfikację. Celem tego artykułu jest określenie czynników wpływających na wykorzystanie RA wśród zmotywowanych firm w Malezji. Poufne dane dotyczące zwrotu podatku analizowano za pomocą dwumianowej regresji logistycznej, a wyniki potwierdziły, że istnieją powiązania między rentownością, inwestycją, sektorem i efektywną stopą podatkową a wykorzystaniem RA. W związku z tym, skupiając się na potencjalnych determinantach wykorzystania RA, przyniesie to korzyści zarówno decydentom, jak i graczom z branży, w celu zwiększenia skuteczności stosowania RA, który został zaprojektowany w celu wspierania Przemysłu 4.0.
Źródło:
Polish Journal of Management Studies; 2018, 18, 2; 94-104
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hypertonic saline solution (NaCl 7.2%) enhances renal excretion of acids in cattle with acute ruminal lactic acidosis
Autorzy:
Rodrigues, F.A.M.L.
Minervino, A.H.H.
Barrêto Júnior, R.A.
Reis, L.F.
Ferreira, R.N.F.
Mori, C.S.
Oliveira, F.L.C.
Sousa, R.S.
Powiązania:
https://bibliotekanauki.pl/articles/2087583.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
steers
ruminal lactic acidosis
hypertonic saline solution
Źródło:
Polish Journal of Veterinary Sciences; 2019, 1; 37-42
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prevalence of intestinal parasites among the population of the Gaza Strip, Palestine
Autorzy:
Mezeid, N.
Shaldoum, F.
Al-Hindi, A.I
Mohamed, F.S.A.
Darwish, Z.E.A.
Powiązania:
https://bibliotekanauki.pl/articles/5938.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
prevalence
intestinal parasite
parasite
population
health problem
Gaza Strip region
Palestine
Opis:
Intestinal parasitic diseases in Gaza Strip are a significant health problem. The main aim of this study is to determine the prevalence of parasitic infection among patients in the five governorates of the Gaza Strip. A crosssectional parasitological survey was conducted on 600 patients. Stool specimens were examined microscopically for the presence of parasite eggs or larvae/cysts per wet amount by the saline iodine and formol-ether concentration method. Of 600 subjects examined, 245 (40.8%) were infected with one or more intestinal parasites. Entamoeba histolytica/dispar and Giardia lamblia were the most prevalent parasites amongst the population (28.8%), (9.5%). Female patients demonstrated a higher prevalence of intestinal parasitic infections (42.7%) than males (39.0%). However, this difference was not significant (p>0.05). According to occupation, the rate of infection was highest among farmers (56.0%), followed by employers (44.2%) with laborers showing the lowest rate (30.17%). These differences in occupational prevalence were found to be statistically significant (p<0.05). The present study demonstrates that intestinal protozoan infections are still a public health problem in the Gaza strip, with Entamoeba and Giardia infections being most common. Therefore, it is necessary to develop effective prevention and control strategies, including health education and environmental sanitation improvement.
Źródło:
Annals of Parasitology; 2014, 60, 4
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Initial Public Offerings: Is There Money Left on the Table? Comparative Study of the Top Five IPOs in Poland and the United States
Autorzy:
C, Nikola M A K O J E V I
C, Nikola S T E F A N O V I
C, Petar V E S E L I N OV I
Powiązania:
https://bibliotekanauki.pl/articles/701812.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Ekonomista; 2014, 4
0013-3205
2299-6184
Pojawia się w:
Ekonomista
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prognozowanie cen aktywów: Eugen F. Fama, Lars P. Hansen, Robert Shiller – laureaci Nagrody Nobla w dziedzinie ekonomii w 2013 r
Autorzy:
K, Waldemar F R Ą C K O W I A
A, Adam Z A R E M B
Powiązania:
https://bibliotekanauki.pl/articles/701814.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Ekonomista; 2014, 4
0013-3205
2299-6184
Pojawia się w:
Ekonomista
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilization of services and referrals through dental outreach programs in rural areas of India. A two year study
Autorzy:
Asawa, K.
Bhanushali, N.V.
Tak, M.
Kumar, D.R.V.
Rahim, M.F.B.A.
Alshahran, O.A.
Divakar, D.D.
Powiązania:
https://bibliotekanauki.pl/articles/877920.pdf
Data publikacji:
2015
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
motivation
utilization
service
referral
dental outreach programme
rural area
rural population
India
Opis:
Background. Oral health care services are often sparse and inconsistent in India therefore it is often difficult for poor people to get access to the oral health care services. The approach by dental institutions with the help of community outreach programs is a step ahead in overcoming this situation. Objectives. The study was conducted to evaluate the number of patients, disease pattern and the services provided in the outreach programmes and also effectiveness of patient referral. Methods. A retrospective study was conducted and the data were obtained from records of outreach programs conducted, in last 2 years by Pacific Dental College and Hospital. The data were analysed using descriptive statistics for the computation of percentages Chi-square test was applied to know the association of effectiveness of referral with age and gender. Confidence level and level of significance was fixed at 95% and 5% respectively. Results. A total of 22982 individuals in the age group of 4-80 years attended the outreach program. Dental caries (42.3%), periodontal diseases (63.2-69.0%) and dental fluorosis (33.7-35.0%) were commonly observed diseases. Effectiveness of referral was significantly high among the middle age adults and females (P<0.05). The effectiveness of referral was highly improved in 2013 after establishment of certain guidelines and strategies. Conclusion. The approaches by dental institutions with the help of community outreach programs can spread awareness and disseminate treatment and thereby enhancing access to care and eliminating access to care within the rural communities.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2015, 66, 3
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SVD Audio Watermarking: A Tool to Enhance the Security of Image Transmission over ZigBee Networks
Autorzy:
El-Bendary, M. A. M.
El-Azm, A. A.
El-Fishawy, N.
Shawki, F.
El-Tokhy, M. A. R.
El-Samie, F. E. A.
Krzemian, H. B.
Powiązania:
https://bibliotekanauki.pl/articles/308392.pdf
Data publikacji:
2011
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
audio watermarking
copyright protection
IEEE 802.15.4, SVD
Opis:
The security is important issue in wireless networks. This paper discusses audio watermarking as a tool to improve the security of image communication over the IEEE 802.15.4 ZigBee network. The adopted watermarking method implements the Singular-Value Decomposition (SVD) mathematical technique. This method is based on embedding a chaotic encrypted image in the Singular Values (SVs) of the audio signal after transforming it into a 2-D format. The objective of chaotic encryption is to enhance the level of security and resist different attacks. Experimental results show that the SVD audio watermarking method maintains the high quality of the audio signals and that the watermark extraction and decryption are possible even in the presence of attacks over the ZigBee network.
Źródło:
Journal of Telecommunications and Information Technology; 2011, 4; 99-107
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel orchiectomy surgical procedure in donkeys (Equus asinus africanus) with parascrotal access
Autorzy:
Barrêto JR, R.A.
Rodrigues, L.A.
Albuquerque, J.P.
de Sousa, F.J.A.
Firmino, P.R.
Sousa, R.S.
Pedrosa, V.J.
do Amaral, T.R.
Minervino, A.H.H.
Powiązania:
https://bibliotekanauki.pl/articles/16539181.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
inflammation
donkeys
peritoneal fluid
surgical approach
castration
Opis:
Donkeys are a public health concern in the Northeast region of Brazil, with thousands of stray animals. Orchiectomy is an important population control measure; however, the long postoperative period with daily treatment of open wounds in the scrotum makes it difficult to perform a large number of castrations in sheltering centers. We evaluate a novel surgical procedure for orchiectomy in donkeys using parascrotal access. Twelve donkeys were used, divided into two groups: I - submitted to orchiectomy through parascrotal surgical access (novel procedure), and II - submitted to orchiectomy through scrotal access (conventional). Postoperative evaluations consisted of a macroscopic evaluation of the surgical wound (bleeding and intensity of edema), hematological parameters, and peritoneal fluid, which occurred in both groups at the moments (M): M0 - before the surgical procedure. The others moments occurred after surgery: M12 (twelve hours); M24 (twenty-four hours); M48 (forty-eight hours); M72 (seventy-two hours); M8D (eight days); and M16D (sixteen days). The surgical techniques did not generate an important systemic inflammatory response to the point detected by the leukogram, fibrinogen dosage, and peritoneal fluid. The parascrotal technique required long surgery but promoted less bleeding, less edema, and faster healing. The techniques used did not promote sufficient systemic inflammation to alter the number of leukocytes and the fibrinogen concentration; however, evaluation of the peritoneal fluid proved to be important for evaluating inflammatory processes involving the scrotum and inguinal canal. We describe a novel surgical procedure for orchiectomy in Donkeys using a parascrotal access that promoted less risk of bleeding, shorter period of edema, and healing time, but required longer surgery time.
Źródło:
Polish Journal of Veterinary Sciences; 2022, 25, 2; 295-302
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-100 z 1883

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