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Wyświetlanie 1-15 z 103
Tytuł:
Optimisation of thinning of apple fruitlets cv. 'Braeburn Mariri Red'
Autorzy:
Szot, I.
Lipa, T.
Powiązania:
https://bibliotekanauki.pl/articles/13925588.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
apple tree
Braeburn Mariri Red cultivar
thinning
chemical thinning
fruitlet thinning
fruit size
benzyladenine
cytokinin
metamitron
thinning agent
Źródło:
Acta Agrophysica; 2019, 26, 3; 65-76
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
K3M: A universal algorithm for image skeletonization and a review of thinning techniques
Autorzy:
Saeed, K.
Tabędzki, M.
Rybnik, M.
Adamski, M.
Powiązania:
https://bibliotekanauki.pl/articles/907744.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
szkieletyzacja
obraz cyfrowy
przetwarzanie obrazu
przetwarzanie równoległe
skeletonization
thinning
digital image processing
parallelization
iteration
thinning methodologies
sequential thinning
parallel thinning
Opis:
This paper aims at three aspects closely related to each other: first, it presents the state of the art in the area of thinning methodologies, by giving descriptions of general ideas of the most significant algorithms with a comparison between them. Secondly, it proposes a new thinning algorithm that presents interesting properties in terms of processing quality and algorithm clarity, enriched with examples. Thirdly, the work considers parallelization issues for intrinsically sequential algorithms of thinning. The main advantage of the suggested algorithm is its universality, which makes it useful and versatile for a variety of applications.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2010, 20, 2; 317-335
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic Heating Produced in the Thermoviscous Flow of a Shear-Thinning Fluid
Autorzy:
Perelomova, A.
Powiązania:
https://bibliotekanauki.pl/articles/177000.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic heating
non-Newtonian liquids
shear-thinning fluid
Opis:
This study is devoted to the instantaneous acoustic heating of a shear-thinning fluid. Apparent viscosity of a shear-thinning fluid depends on the shear rate. That feature distinguishes it from a viscous Newtonian fluid. The special linear combination of conservation equations in the differential form makes it possible to derive dynamic equations governing both the sound and non-wave entropy mode induced in the field of sound. These equations are valid in a weakly nonlinear flow of a shear- thinning fluid over an unbounded volume. They both are instantaneous, and do not require a periodic sound. An example of a sound waveform with a piecewise constant shear rate is considered as a source of acoustic heating.
Źródło:
Archives of Acoustics; 2011, 36, 3; 629-642
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ trzebieży na dynamikę rozwoju drzewostanów sosnowych
The effect of thinning regimes on the dynamics of Scotch pine stand development
Autorzy:
Lockow, K.W.
Powiązania:
https://bibliotekanauki.pl/articles/1026769.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany sosnowe
trzebieze
dynamika wzrostu
lesnictwo
przyrost drzewostanu
rozwoj drzewostanu
przyrost drzew
pine stand
thinning regime
thinning intensity
tree morphological type
productivity
Opis:
The paper presents research results obtained from permanent experimental plots established in pine stands in the northeast German Lowland. It was demonstrated that thinnings affect the dynamics of stand development, quality and productivity.
Źródło:
Sylwan; 2003, 147, 09; 3-9
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of thinning on Pinus pinea L. development and physico-chemical soil characteristics in northwestern Tunisia: modeling of radial growth under thinning intensity
Autorzy:
Jaouadi, W.
Mechergui, K.
Riahi, M.A.
Khouja, M.L.
Powiązania:
https://bibliotekanauki.pl/articles/2077939.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Pinion pine
silviculture
thinning intensity
stem volume
radial growth
cones production
Opis:
In this study, the potential beneficial impacts that the thinnings intensity on stand behavior and soil properties are also studied. This study was designed to test the hypothesis that thinning to various stand densities at young age enhance productivity of wood, cones and the physicochemical characteristics of the soil in Pinus pinea stands. We based our study on four thinning intensity (30, 40, 50 and 65%) in comparison with the control plot. The study was supplemented by a haracterization of radial growth of trees under the four thinning intensity. It was based on a complete randomized experimental field installed in 1994 in Tabarka forest, in Tunisia. For the radial growth analysis, three cores were taken from 125 trees at a rate of one tree per plot.The study showed that thinning has a significant effect on all dendrometric parameters. They revealed that a thinning intensity of 65% produces the best wood production (180.710 m3/ha), in annual growth in volume (4.634 m3/ha/year) and cone production (1211 cones/ha) compared to other thinning and control plot. Associated vegetation was also influenced by thinning intensities. The physicochemical characteristics of the soil were improved by thinning compared with the control. Signif- icant radial growth thinning was recorde especially in a thinning of 65% intensity (increases of 3.5 to 6.1 mm/year) compared to the control (1.1 to 2 mm/year). A strong relationship between radial growth and age was recorded at Thinning 4 (R2 = 0.923). These results can be used as an initial basis to refine silvicul- ture of pinion pine in order to improve stand productivity in Tunisia in wood and especially in cones given their importance on the world market.
Źródło:
Dendrobiology; 2018, 80; 70-80
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A simulation of thinning of microphone array in near-field broadband beamformers
Autorzy:
Wielgus, Agnieszka
Szlachetko, Bogusław
Powiązania:
https://bibliotekanauki.pl/articles/2146656.pdf
Data publikacji:
2021
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
acoustics
beamforming systems
microphone array
thinning technique
akustyka
beamforming
macierz mikrofonów
technika przerzedzania
Opis:
This paper is devoted to the problem of designing an optimal microphone matrix. We define a criterion function where the performance of our matrix should be as close as possible to the desired one based on L2 norm. In the classical approach, increasing a size of the matrix is used to improve the system performance. However, in many cases it is not a good solution. In this paper we propose a solution based on thinning technique. We work with rectangular, equispaced microphone matrix and using metaheuristic approach called simulated annealing we optimise the set of active microphones (we switch off some of the microphones from the regular matrix). For illustrations, few numerical examples are solved. Comparing to the classical approach we show that thinning microphone matrix can significantly improve system performance.
Źródło:
Vibrations in Physical Systems; 2021, 32, 2; art. no. 2021204
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3D thinning and its applications to medical image processing
Autorzy:
Palágyi, K.
Sorantin, E.
Halmai, C.
Kuba, A.
Powiązania:
https://bibliotekanauki.pl/articles/1954512.pdf
Data publikacji:
1999
Wydawca:
Politechnika Gdańska
Tematy:
skeletonization techniques
3D parallel thinning
medical image processing
Opis:
A skeleton is a frequently-used feature to represent the general form of an object. The importance of this region-based shape feature is growing in medical image processing, too. This paper summarizes the major skeletonization approaches, the 3D parallel thinning methodologies and some emerging medical applications. An application to calculate the cross-sectional profiles of blood vessels is also presented.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1999, 3, 4; 397-407
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of thinning of homogeneous material using active thermography and classification trees
Autorzy:
Dudzik, Sebastian
Dudek, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/1848987.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
active thermography
classification tree
defect detection and characterization
material thinning detection
Opis:
Active thermography is an efficient tool for defect detection and characterization as it does not change the properties of tested materials. The detection and characterization process involves heating a sample and then analysing the thermal response. In this paper, a long heating pulse was used on samples with a low thermal diffusivity and artificially created holes of various depths. As a result of the experiments, heating and cooling curves were obtained. These curves, which describe local characteristics of the material, are recognized using a classification tree and divided into categories depending on the material thickness (hole depths). Two advantages of the proposed use of classification trees are: an in-built mechanism for feature selection and a strong reduction in the dimensions of the pattern. Based on the experimental study, it can be concluded that classification trees are a useful tool for the thinning detection of homogeneous material.
Źródło:
Metrology and Measurement Systems; 2021, 28, 1; 89-105
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porównanie efektywności mechanicznego przerzedzania kwiatów do chemicznego i ręcznego przerzedzania zawiązków owocowych jabłoni odmian ‘Gala Must’ i ‘Red Jonaprince’
Comparison of the effectiveness of mechanical thinning of flowers to chemical and manual thinning of fruitlets of apple trees ‘Gala Must’ and ‘Red Jonaprince’
Autorzy:
Buler, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2118897.pdf
Data publikacji:
2021
Wydawca:
Instytut Ogrodnictwa
Tematy:
apple tree
thinning
yielding
fruit quality
Opis:
Eight-year-old abundantly blooming apple trees ‘Gala Must’ and ‘Red Jonaprince’ grafted on a dwarf rootstock M.9, spaced 3.5 × 1.5 m and 3.5 × 1.8 m, were subjected to bloom and fruit thinning. This included 7 types of treatments: 1. (M) mechanical flower thinning in the full bloom stage with the German produced BAUM appliance; 2. (C) chemical thinning of fruitlets with cytokinins (Globaryll product); 3. (R) hand fruit thinning in June; 4. (M+C) mechanical thinning of flowersin full bloom, followed by chemical thinning of fruitlets in June as in point 3; 5. (M+R) mechanical thinning of flowers in full bloom stage, followed by hand fruit thinning in June; 6. (C+R) chemical thinning of fruitlets, followed by hand fruit thinning in June; 7. (K) control – no thinning. All thinning treatments decreased yield but increased the size of the fruit, the mean fruit weight, and the growth of the shoots. Among the treatments applied to ‘Gala Must’ trees, the best results were obtained with the M and M+R treatments. Most of the fruit had a favorable marketing size, in the range of 7.5–8.5 cm. The M+C and C+R treatments resulted in too many overgrown apples, which are prone to physiological disorders during storage. Among the treatments applied to ‘Red Jonaprince’, the best results were obtained with M and M+R. The other treatments resulted in an excessively large drop in yield and a very high share of overgrown fruit over 9.0 cm in diameter, unacceptable on the market. The thinning treatments increased the solubility of the solids in the fruit of both cultivars with no clear effect on their firmness.
Źródło:
Zeszyty Naukowe Instytutu Ogrodnictwa; 2021, 29; 1-14
2300-5882
2391-8969
Pojawia się w:
Zeszyty Naukowe Instytutu Ogrodnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A modified K3M thinning algorithm
Autorzy:
Tabedzki, M.
Saeed, K.
Szczepański, A.
Powiązania:
https://bibliotekanauki.pl/articles/331149.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
skeletonization
thinning algorithm
K3M algorithm
digital image processing
szkieletyzacja
pocienianie
algorytm K3M
cyfrowe przetwarzanie obrazu
Opis:
The K3M thinning algorithm is a general method for image data reduction by skeletonization. It had proved its feasibility in most cases as a reliable and robust solution in typical applications of thinning, particularly in preprocessing for optical character recognition. However, the algorithm had still some weak points. Since then K3M has been revised, addressing the best known drawbacks. This paper presents a modified version of the algorithm. A comparison is made with the original one and two other thinning approaches. The proposed modification, among other things, solves the main drawback of K3M, namely, the results of thinning an image after rotation with various angles.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2016, 26, 2; 439-450
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Above- and below-ground tree parameters and their development after modelling of thinning in young elm stands
Autorzy:
Šrámek, Martin
Hurt, Václav
Čermák, Jan
Powiązania:
https://bibliotekanauki.pl/articles/956995.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
elm
leaf area
absorptive root area
biomass
thinning
Opis:
During the last century almost two-thirds of all elms were lost due to the Dutch elm disease. Therefore, elms are an endangered species with a lasting lack of knowledge about ecosystem functions of elms in forest stands. The study describes several above- and below-ground tree parameters and their changes after simulation of thinning in one young forest stand with dominant Ulmus laevis Pall. in the Czech Republic. The distribution of the leaves was measured using the ‘cloud’ technique. The absorptive root area was measured with the aid of the modified earth impedance method to evaluate below-ground tree parameters. Using allometric equations, it was possible to calculate certain tree parameters of individual trees as well as the entire forest stand. The modelling of four thinning intensities (low, medium, high and very high) helped to establish the changes of these tree parameters after treatment. The leaf area index of the stand was 5.6, the absorptive root area index was 1.7 and the total biomass of foliage was 8.5 Mg ha–1 prior to the treatment. The absorptive root area amounted to 30% of the foliage area. The exponential models were developed to predict the above- and below-ground tree parameters. Under the different thinning intensities, the following were found: a negative correlation with the number of trees for the leaf area index, the foliage biomass and the absorptive root area index. This knowledge is important in the process of maintaining the presence of endangered elms in forest stands and in ecosystem services (e.g. carbon storage) throughout Europe.
Źródło:
Dendrobiology; 2017, 77; 77-90
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Litter-fall and humus accumulation in thinning experiment Kristianov in the Jizerske Hory Mts.
Autorzy:
Novak, J.
Slodicak, M.
Dusek, D.
Powiązania:
https://bibliotekanauki.pl/articles/38641.pdf
Data publikacji:
2010
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
litter fall
humus accumulation
thinning
Izerskie Mountains
Picea abies
Norway spruce
nutrient cycle
tree stand
Źródło:
Folia Forestalia Polonica. Series A . Forestry; 2010, 52, 2
0071-6677
Pojawia się w:
Folia Forestalia Polonica. Series A . Forestry
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przerzedzanie ręczne zawiązków a plon i jakość owoców jabłoni odmiany ‘Jonagold’/M.26
Influence of hand thinning methods on yield and fruit quality of apple trees cv. ‘Jonagold’/M.26
Autorzy:
Szot, I.
Powiązania:
https://bibliotekanauki.pl/articles/35676.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
jablonie
jablon Jonagold
przerzedzanie zawiazkow
przerzedzanie reczne
plony
owoce
jablka
jakosc owocow
apple tree
Jonagold cultivar
fruit set thinning
manual thinning
yield
fruit
apple
fruit quality
Opis:
Badania przeprowadzono na pięcioletnich jabłoniach odmiany ‘Jonagold’/M.26 w latach 1997-1999. Zabiegi ręcznego przerzedzania zawiązków wykonano w połowie maja pozostawiając owoce z kwiatów królewskich lub bocznych oraz po świętojańskim opadzie zawiązków. Obiekt kontrolny stanowiły drzewa na których nie przeprowadzono przerzedzania zawiązków. Uzyskane wyniki wskazują, że drzewa kontrolne wykazały wyraźną przemienność owocowania. Przerzedzanie zawiązków wpłynęło na zwiększenie masy pojedynczego owocu, jędrności miąższu i zawartości ekstraktu w porównaniu z kontrolą. Zauważono, że sezon badań miał istotny wpływ na cechy jakościowe owoców. Jabłka zebrane w 1998 i 1999 roku miały większą zawartość suchej masy, ekstraktu i cukru, niż owoce w pierwszym roku badań.
The investigations were carried out in a commercial orchard in the Lublin region on 5-year old apple trees cv. Jonagold’/M.26 in the years 1997-1999. Hand thinning was made in the middle of May, leaving the fruits from king or lateral flowers intact, or after the June Drop. The fruitlets were not thinned in the control trees. The obtained results show that control trees were characterised by typical biennial bearing. All thinning methods in the studied seasons caused an increase in the individual fruit mass, flesh firmness and soluble solids content as compared to the control. It was noted that the season had a great effect on the quality features of apples. Apples harvested in 1998 and 1999 had much higher dry matter, soluble solids and sugar content than fruits in the first year of study.
Źródło:
Acta Agrophysica; 2011, 17, 1[188]
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ekonomiczna efektywność zabiegów trzebieżowych w drzewostanach sosnowych II i III klas wieku
Economic efficiency of thinning in pine stands of II and III age classes
Autorzy:
Ankudo-Jankowska, A.
Glura, J.
Ankudo, L.
Kowalczyk, H.
Powiązania:
https://bibliotekanauki.pl/articles/993960.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewostany sosnowe
drzewostany II klasy wieku
drzewostany III klasy wieku
trzebieze
trzebiez wczesna
efektywnosc ekonomiczna
economic efficiency
early thinning
profitability of thinning
Opis:
The article presents an economic evaluation of effectiveness of early thinnings in pine stands. The assessment was based on the relationship between the revenues from timber sales and treatments costs. Studies confirmed that the profitability of thinning depends on the quality of habitat, stand age and forest district. Effectiveness of thinning is rising with increasing habitat quality. Costs of thinning are decreasing with the stand age.
Źródło:
Sylwan; 2013, 157, 01; 17-25
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 103

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