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Wyświetlanie 1-10 z 41
Tytuł:
Forecasting short-term electric load using extreme learning machine with improved tree seed algorithm based on Lévy flight
Autorzy:
Chen, Xuan
Przystupa, Krzysztof
Ye, Zhiwei
Chen, Feng
Wang, Chunzhi
Liu, Jinhang
Gao, Rong
Wei, Ming
Kochan, Orest
Powiązania:
https://bibliotekanauki.pl/articles/2087016.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
short-term electric load forecast
extreme learning machine
Lévy flight
tree-seed algorithm
Kernel principal component analysis
Opis:
In recent years, forecasting has received increasing attention since it provides an important basis for the effective operation of power systems. In this paper, a hybrid method, composed of kernel principal component analysis (KPCA), tree seed algorithm based on Lévy flight (LTSA) and extreme learning machine (ELM), is proposed for short-term load forecasting. Specifically, the randomly generated weights and biases of ELM have a significant impact on the stability of prediction results. Therefore, in order to solve this problem, LTSA is utilized to obtain the optimal parameters before the prediction process is executed by ELM, which is called LTSA-ELM. Meanwhile, the input data is extracted by KPCA considering the sparseness of the electric load data and used as the input of LTSA-ELM model. The proposed method is tested on the data from European network on intelligent technologies (EUNITE) and experimental results demonstrate the superiority of the proposed approaches compared to the other methods involved in the paper.
Źródło:
Eksploatacja i Niezawodność; 2022, 24, 2; 153--162
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seed vigour testing for predicting field seedling emergence in Fagus sylvatica L.
Autorzy:
Jensen, M
Powiązania:
https://bibliotekanauki.pl/articles/41595.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
predictability
vigor test
Fagus sylvatica
beech
seed vigor
seedling emergence
critical root length
tree seed
Opis:
A vigour test that can predict the field emergence percentage of tree seeds accurately has long been a wish from growers. A new test method, the Critical Root Length (CRL) vigour test, was developed for beech seeds on the basis of the length of primary roots, germinated seeds can produce during a specified test. Pretreated, imbibed seeds were germinated in a vertically positioned moist paper roll during 20days at 15°C in 12 hour light daily. Root length of normally germinated seedlings was recorded and correlated with field emergence percentage to obtain a critical root length for the ability to emerge in the field. Critical root length for Fagus sylvatica was found to be 45 mm. The percentage of normally germinated seeds with roots longer than 45 mm in the CRL test is a predicted estimate of the field emergence percentage of a seed lot. Results of two tests on 5 and 10seed lots showed generally good correlation between CRL predicted emergence and actually obtained field seedling emergence. Large variation in root length was found between and within seed lots, thus displaying large differences in seed vigour. The new test is an applied, easy and inexpensive vigour test developed for nurserymen and seed technicians in order to predict field emergence more accurately.
Źródło:
Dendrobiology; 2002, 47 Supplement
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of local tree seeds in the control of root knot nematode Meloidogyne javanica (Treub) Chitwood and growth promotion of chickpea (Cicer arietinum L.) and mung bean (Vigna radiata L.)
Stosowanie nasion z lokalnych drzew do zwalczania guzaka korzeniowego Meloidogyne javanica (Treub) Chitwood oraz wspomagania wzrostu ciecierzycy pospolitej (Cicer arietinum L.) i fasoli mung (Vigna radiata L.)
Autorzy:
Ahmed, Z.M.
Dawar, S.
Tariq, M.
Zaki, M.J.
Powiązania:
https://bibliotekanauki.pl/articles/26908.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
local tree
tree seed
seed
Azadirachta indica
Adenanthera pavonina
Leucaena leucocephala
control
root knot
nematode
Meloidogyne javanica
growth promotion
chick-pea
Cicer arietinum
mung bean
Vigna radiata
Opis:
Seeds of local trees, such Azadirachta indica A. Juss, Adenanthera pavonina L., Leucaena leucocephala (Lam.) de Wit and Eucalyptus spp., were used as aqueous extract at 25, 50 and 100 % concentration to control the activity of Meloidogyne javanica (Treub) Citwood. All seed extracts showed lethal effect on M. javanica eggs, and a gradual decrease in egg hatching and an increase in mortality of second-stage juveniles were observed with the increase in extract concentration. L. leucocephala was found to be most effective in reducing egg hatching, whereas 100 % mortality of juveniles was observed in the case of A. indica seed extract. Number of knots was significantly reduced at 100 % concentration when seeds of chick pea and mung bean were treated and soil was drenched with A. pavonina and Eucalyptus spp. seed extract.
Źródło:
Acta Agrobotanica; 2010, 63, 1
0065-0951
2300-357X
Pojawia się w:
Acta Agrobotanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany struktury genetycznej pomiędzy populacją rodzicielską a potomną w drzewostanie nasiennym sosny zwyczajnej (Pinus sylvestris L.)
Changes of genetic structure between parental and offspring populations in a seed stand of Scots pine [Pinus sylvestris L.]
Autorzy:
Dzialuk, A.
Burczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/1018561.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany nasienne
sosna zwyczajna
lesnictwo
zmiany struktury genetycznej
populacje rodzicielskie
populacje potomne
Pinus sylvestris
drzewa lesne
genetic diversity
genetic erosion
seed tree stand
scots pine
Opis:
Eight isozyme gene loci were used to compare genetic structure and variation of parental and offspring populations of Scots pine (Pinus sylvestris L.) in the seed tree stand located in the Woziwoda Forest District of the Tuchola Forest. Although, the estimated parameters indicate small reduction of heterozygosity in offspring populations, the stand may be considered as a valuable seed source for reforestation.
Źródło:
Sylwan; 2006, 150, 10; 30-38
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Określenie pochodzenia wyłączonych drzewostanów nasiennych sosny rychtalskiej (Pinus sylvestris L.) z wykorzystaniem markerów mikrosatelitarnych
Determination of the origin of the rychtal Scots pine (Pinus sylvestris L.) seed tree stands using microsatellite markers
Autorzy:
Wójkiewicz, B.
Żukowska, W.B.
Urbaniak, L.
Kowalczyk, J.
Litkowiec, M.
Lewandowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/985719.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
hodowla lasu
sosna zwyczajna
Pinus sylvestris
sosna rychtalska
drzewostany nasienne
pochodzenie roslin
zmiennosc genetyczna
analiza DNA
markery mikrosatelitarne
scots pine
genetic variation
gene pool
genetic structure
ssr markers
Opis:
The rychtal pine is one of the most valuable ecotypes of Scots pine (Pinus sylvestris L.) approved for the breeding purposes in Poland. However, it occupies stands typical for oaks and beeches as shown by the compatibility analysis of species composition in relation to the habitat type in which they occur. Such result raises some doubts in terms of the naturalness of the rychtal pine and calls its history and origin into question. In the present study, we used the set of nuclear microsatellite markers to characterize and compare the gene pool composition of the selected seed tree stands of the rychtal pine with 200−year−old pine trees which grow at the Syców Forest District (SW Poland). We aimed to know to what extent the set of alleles specified for the group of the oldest trees from natural habitats is represented in the younger forest tree stands of the rychtal pine. The analysis of molecular variance (AMOVA) and clustering analysis showed that the gene pool of the studied pine populations was homogenous (FST=0,02%, K=1). The parameters of genetic variation were similar for all populations except for the mean number of alleles. On average, 25 new alleles were found in two rychtal pine seed tree stands as compared to the set of alleles found in the group of old pine trees. However, all alleles defined for old pines were also present in the gene pool of younger rychtal pine forest stands. The differences in the gene pool richness result most likely from quite high differences in the number of individuals analyzed from each population. In conclusion, our results indicate the common origin of the studied Scots pine populations.
Źródło:
Sylwan; 2019, 163, 08; 637-644
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plantacje nasienne drzew leśnych w Polsce
Seed orchards in Poland
Autorzy:
Kowalczyk, Jan
Rzońca, Marek
Powiązania:
https://bibliotekanauki.pl/articles/470368.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Kardynała Stefana Wyszyńskiego w Warszawie
Tematy:
plantacje nasienne
hodowla selekcyjna drzew leśnych
zysk genetyczny
bioróżnorodność
klasyfikacja plantacji nasiennych
seed orchards
forest tree breeding
genetic gain
biodiversity
classification of seed orchards
Opis:
Polish forests have multiple functions, from the provision of spaces for leisure and recreation and conservation of nature and biodiversity to the creation of wealth and employment and the production of natural resources and raw materials for industry and bioenergy production. This multi-functionality creates conflicts between different uses and stakeholders. As the durability of wood use is inextricably linked to tree breeding, the basic tool for accomplishing these tasks is breeding programmes for forest trees, and one of the important elements in tree breeding activities is the seed orchards. In this review article, we present the state of the art of seed orchards in Poland and their grouping according to importance in forest management. We include historical facts regarding the creation of the idea of seed orchards and its implementation in forest breeding practice. When we manage seed orchards, on the one hand, we care about genetic variability, and on the other hand, we aim for genetic gain. Seed orchards are effective and economically viable for their role in forestry. According to economic studies, the increase in seedling production costs in connection with the use of seeds from seed orchards, does not exceed 3%. According to the authors, seed orchards are the most rational and least ecologically risky way to improve forest production.
Lasy zagospodarowane przez leśników są miejscem wypoczynku, pełnią rozliczne funkcje ochronne i społeczne, lecz są również źródłem produkcji drewna i innych użytków. Zapewnienie trwałości użytkowania drewna jest powiązane nierozerwalnie z rozpoznaniem i ulepszaniem wartości genetycznej i hodowlanej drzew leśnych oraz z jakością wytwarzanego i użytkowanego surowca drzewnego. Podstawowym narzędziem realizacji tych zadań jest hodowla selekcyjna drzew leśnych, a jednym z kluczowych ogniw łańcucha prac selekcyjnych są plantacje nasienne. W przeglądowym artykule zaprezentowano stan plantacji nasiennych w Polsce i ich grupowanie według znaczenia dla gospodarki leśnej. Prezentujemy fakty historyczne dotyczące powstania idei plantacji i jej realizacji w leśnej praktyce hodowlanej. Gospodarując na plantacjach z jednej strony dbamy o zmienność genetyczną, a z drugiej strony staramy się uzyskać jak największy zysk genetyczny. Są one efektywne i ekonomicznie opłacalne, w porównaniu do tego, jakie zadanie mają do wypełnienia w leśnictwie. Jak wynika z analiz ekonomicznych zwiększenie kosztów produkcji sadzonek, w związku z użyciem nasion z plantacji nasiennych, nie przekracza 3%. Zdaniem autorów plantacje nasienne są najbardziej racjonalną i najmniej ekologicznie wątpliwą drogą do poprawy produkcji leśnej.
Źródło:
Studia Ecologiae et Bioethicae; 2018, 16, 3; 53-61
1733-1218
Pojawia się w:
Studia Ecologiae et Bioethicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quality analysis of seeds of Cupressus Linn. species for seed testing and plus tree selection
Autorzy:
Sahai, K
Powiązania:
https://bibliotekanauki.pl/articles/41512.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
germplasm
Cupressus
Cupressaceae
tree selection
sterility
endosperm
seed testing
embryo
quality analysis
seed
Opis:
Cupressus Linn., commonly known as ‘cypress', belongs to the family Cupressaceae. It consists of 20 species with a wide and discontinuous distribution in the Northern Hemisphere. In the present study, three species, namely C. torulosa Don., C. arizonica Greene and C. glabra Sudw., growing in the western Himalayan region of India at an altitude of 1760 m. have been studied. This is a preliminary attempt where embryology is used in estimating seed quality and in seed testing. Seed quality was analysed according to five (0-IV) seed classes based on the presence of the embryo and endosperm and their nature of development in the seed-cutting test. Seeds having neither embryo nor endosperm belong to class ‘0'. In class ‘I' seeds contain the endosperm but a shrivelled embryo or sometimes no embryo. Class ‘II' contains seeds with an embryo of half-length of the embryo cavity and class ‘III' seeds containing an embryo of at least three-quarter length of the embryo cavity. Seeds with completely developed full embryo were assigned to class ‘IV'. However a high percentage of seeds of classes 0-III present in seed lots from particular trees of a species decrease the quality of seeds. Similarly a high percentage of seeds of class ‘IV' improves the seed quality of a given tree selected as plus tree for germplasm collection.
Źródło:
Dendrobiology; 2002, 47 Supplement
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A handbook on propagation of Mediterranean trees and shrubs from seed
Autorzy:
Piotto, B.
Powiązania:
https://bibliotekanauki.pl/articles/40965.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
handbook
Mediterranean shrub
tree
Mediterranean tree
Mediterranean ecosystem
propagation
seed
shrub
Źródło:
Dendrobiology; 2002, 47 Supplement
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of Lihtuanian Scots pine trees according to breeding categories and their seed production in seed stands
Autorzy:
Gabrilavicius, R
Powiązania:
https://bibliotekanauki.pl/articles/41345.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Scotch pine
seed stand
gene conservation
seed collection
tree
seed bearing
Lithuania
distribution
seed
Opis:
In addition to other traits, value of stands for breeding can be evaluated according to the number of plus trees and productive trees. According to this property, stands with the highest value for breeding are located in eastern Lithuania. Trees start to differentiate into breeding categories at the juvenile stage: in Scots pine stands on Pinetum myrtillosum sites, at the age of 6to 8 years and in Scots pine stands on Pinetum vacciniosum sites, at age of 10 to 12 years. According to radial increment, the trees start to differentiate into selection categories of productive, medium and minus trees, which often remain in these categories until mature age. The following four types of radial increment of trees were distinguished: (1) fast growth at the juvenile stage, followed by a gradual decrease, (2) fast growth at the juvenile stage, followed by a stable growth from age 20 to 30 years, (3) slow growth at the juvenile stage, followed gradual increase, (4) unstable growth all the time. In Lithuania, abundant seed yield used to occur in three to four year intervals. Populations with abundant flowering may produce approximately 10 kg of seeds (filled and empty) per ha, while the populations with weak flowering - 1 to 2 kg per ha. In mature Scots pine stands of stocking level ca 0.7, 6to 8% of the seeds are produced by plus trees, 24% by productive trees, 55 to 60% by trees of medium productivity and 10% by minus trees. Being suppressed, minus trees produce 2% of the seeds only.
Źródło:
Dendrobiology; 2002, 47 Supplement
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 41

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