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Wyświetlanie 1-15 z 23
Tytuł:
Zróżnicowanie morfologiczne szyszek daglezji zielonej (Pseudotsuga menziesii [Mirb.] Franco) w Polsce
Morphological differentiation of Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) cones in Poland
Autorzy:
Klimko, M.
Zygmunt, K.
Powiązania:
https://bibliotekanauki.pl/articles/1035852.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
szyszki
Pseudotsuga menziesii
botanika lesna
daglezja zielona
lesnictwo
zroznicowanie morfologiczne
drzewa lesne
pseudotsuga menziesii
variability
cones
Opis:
The paper presents results of studies on population variability of Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) cones. The studies were based on statistical analysis of cone morphological characteristics, seed scales and bract of populations originating from 12 sites. The analysis proved morphological variability of cones and scales. They did not show geographical variation and did not clearly confirm their demographic variation. The edaphic conditions and genetic diversity were found to affect the demonstrated variability.
Źródło:
Sylwan; 2003, 147, 10; 54-65
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ owadów na zdrowotność nasion jodły pospolitej (Abies alba Mill.) na przykładzie Nadleśnictwa Łosie (RDLP w Krakowie)
Impact of insects on health of fir (Abies alba Mill.) seeds exemplified by the Forest District Łosie (the Kraków Forest Region)
Autorzy:
Skrzypczyńska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1023993.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
jodla pospolita
owady
zdrowotnosc nasion
szkodniki nasion
nasiona
RDLP Krakow
Abies alba
lesnictwo
Nadlesnictwo Losie
drzewa lesne
insects
abies alba
cones seed losses
Opis:
The paper contains results of the study concerning infestation of cones of fir Abies alba Mill. by insects. They were represented by conophages: Barbara herrichiana Obr. (Lepidoptera: Tortricidae), Dioryctria abietella (Fabr.) (Lepidoptera: Pyralidae) and Earomyia impossibile Morge (Diptera: Lonchaeidae), and seminiphages: Megastigmus suspectus Borr. (Hymenoptera: Torymidae) and Resseliella piceae Seitn. (Diptera: Cecidomyiidae). The cones were collected in the Forest District Łosie (the Kraków Forest Region) in 1999, 2000 and 2003.
Źródło:
Sylwan; 2004, 148, 09; 29-33
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two Funerary Cones of Padineith Found in the Theban Tomb MMA 1152
Autorzy:
Kopp, Edyta
Powiązania:
https://bibliotekanauki.pl/articles/484087.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Kultur Śródziemnomorskich i Orientalnych PAN
Tematy:
funerary cones
reused objects
Padineith
Asasif
Theban necropolis
Late Period Egypt
Opis:
This article is an Egyptological study of two funerary cones of the otherwise well known Theban official of the Twenty-sixth Dynasty, Padineith, majordomo of the Divine Consorts of Amun, who was buried in the tomb TT 197 on the Asasif cemetery. These two cones, however, were found in the structures of another Theban Tomb – MMA 1152 – turned into a hermitage by Christian monks – among objects, obviously brought back from peregrinations of these men all over through the Theban West Bank, most probably with intention to use them for some other secondary purpose.
Źródło:
Études et Travaux (Institut des Cultures Méditerranéennes et Orientales de l’Académie Polonaise des Sciences); 2014, 27; 195-199
2084-6762
2449-9579
Pojawia się w:
Études et Travaux (Institut des Cultures Méditerranéennes et Orientales de l’Académie Polonaise des Sciences)
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Towards historical roots of necessary conditions of optimality: Regula of Peano
Autorzy:
Dolecki, S.
Greco, G. H.
Powiązania:
https://bibliotekanauki.pl/articles/970285.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
różniczkowalność
zbiór wypukły
differentiability
convex set
Kuratowski limit of sets
tangent cones
condition of optimality
mean value theorem
Peano remainder
Peano's regula
strict derivability
Peano's Formulario Mathematico
Peano's Geometric Calculus
Grassmann's Ausdehnungslehre
Opis:
At the end of 19th century Peano discerned vector spaces, differentiability, convex sets, limits of families of sets, tangent cones, and many other concepts, in a modern perfect form. He applied these notions to solve numerous problems. The theorem on necessary conditions of optimality (Regula) is one of these. The formal language of logic that he developed, enabled him to perceive mathematics with great precision and depth. Actually he built mathematics axiomatically based exclusively on logical and set-theoretic primitive terms and properties, which was a revolutionary turning point in the development of mathematics.
Źródło:
Control and Cybernetics; 2007, 36, 3; 491-518
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of selected supercritical CO2 plant extract addition on user properties of shower gels
Autorzy:
Vogt, Otmar
Sikora, Elżbieta
Ogonowski, Jan
Powiązania:
https://bibliotekanauki.pl/articles/778999.pdf
Data publikacji:
2014
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
supercritical CO2 extract
black currant seeds
strawberry seeds
hop cones
mint leafs
shower gel
Opis:
The formulations of washing cosmetics i.e. shower gels, containing extracts obtained during supercritical CO2 extraction process as active ingredient, were developed. The subject of the study was the analysis of the physicochemical and user properties of the obtained products. In the work supercritical CO2 extracts of black currant seeds, strawberry seeds, hop cones and mint leafs were used. The formulation contains a mixture of surfactants (disodium cocoamphodiacetate, disodium laureth sulfosuccinate, cocoamide DEA, cocoamidepropyl betaine, Sodium Laureth Sulfate). Various thickener agents were applied to the obtained desired rheological properties of the cosmetics. Among others, sorbitol acetal derivatives, methylhydroxypropylcellulose and C10-30 alkyl acrylate crosspolymer were used. For stable products, the effect of extracts addition (black currants seeds, strawberries seeds, mint and hops, obtained from supercritical CO2 extraction process) on the cosmetics properties, such as pH, viscosity, detergency and foam ability, were determined. The obtained results showed that the extracts could be used as components of shower gels.
Źródło:
Polish Journal of Chemical Technology; 2014, 16, 4; 51-54
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on Synthesis and Modification of Conical Ni Structures by One-Step Method
Autorzy:
Skibińska, K.
Semeniuk, S.
Kutyła, D.
Kołczyk-Siedlecka, K.
Jędraczka, A.
Żabiński, P.
Powiązania:
https://bibliotekanauki.pl/articles/2049399.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrodeposition
one-step method
crystal modifier
nickel cones
free-standing structures
Opis:
In this work the conical Ni structures were obtained from an electrolyte containing NH4Cl as a crystal modifier. This process is called one-step method and allows to cover large areas with micro- and nanostructures during a single electrodeposition. Presence of NH4Cl promotes a vertical direction of structure growth in order to block a horizontal one. Additionally, this method does not require using chromic acid solution, which is dangerous for the environment. Due to the ferromagnetic properties of Ni, obtained coatings could be applied as magnetic devices. The influence of the parameters such as a preparation of copper substrate, a composition of electrolyte and electrodeposition conditions (time, the electrolyte temperature and current density) was investigated in this work.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 3; 861-869
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability of the hop bitter acids during long-term storage of cones with different maturity degree
Autorzy:
Skomra, Urszula
Koziara-Ciupa, Marta
Powiązania:
https://bibliotekanauki.pl/articles/2148476.pdf
Data publikacji:
2020-03-31
Wydawca:
Instytut Uprawy Nawożenia i Gleboznawstwa – Państwowy Instytut Badawczy
Tematy:
hop
alpha acids
beta acids
storage temperature
cones maturity
Opis:
The aim of the study was to assess the dynamicsof changes in the content of hop bitter acids during long-termstorage of cones that vary in maturity degree under differenttemperature conditions. The impact of the degree of maturityof hop cones on the stability of bitter acids during storage islittle known so far, and it is important, because due to the systematicincrease of the hop growing area on individual farms, thecone harvesting period is extended beyond the optimal phase oftechnological maturity. Hop cultivars belonging to two groupswere included in the study: bitter (Magnat, Magnum) and aroma(Puławski, Sybilla). Cones were collected on a few dates duringvegetation season, starting from the phase in which they reachedmaximum size until the beginning of physiological maturity.The dried cones were stored at +5 °C and +20 °C for 12 monthsand tested every three months for alpha and beta acid contentusing HPLC. Studies have shown that too early a hop harvestadversely affected bitter acid content. Storage temperature hadsignificant impact on the degradation of alpha and beta acids. Ata higher temperature the decrease in the content of these compoundswas greater. The tested hop cultivars were characterized bydifferent stability of bitter acids. The highest stability of alphaacids was observed for Sybilla, while the lowest for Magnat.The stability of alpha and beta acids during long-term storageof the raw material, especially at + 20oC, depended on the degreeof cones maturity. The aging rate of hop cones was not thesame throughout the storage period. For the first 3–6 months ata temperature of +5oC, the bitter acid content remained at a levelsimilar to the initial one, later a relatively rapid decrease in thecontent of these metabolites occurred. At higher temperatures,the bitter acid stabilization period was shorter.
Źródło:
Polish Journal of Agronomy; 2020, 40; 16-24
2081-2787
Pojawia się w:
Polish Journal of Agronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Second-order optimality conditions in nonsmooth vector optimization
Autorzy:
Yadav, Priyanka
Powiązania:
https://bibliotekanauki.pl/articles/31342762.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
vector optimization
cones
nonsmooth second-order cone-convexity
second-order optimality
duality
Opis:
In this paper, we introduce new classes of nonsmooth second-order cone-convex functions and respective generalizations in terms of first and second-order directional derivative. These classes encapsulate several already existing classes of cone-convex functions and their weaker variants. Second-order KKT type sufficient optimality conditions and duality results for a nonsmooth vector optimization problem are proved using these functions. The results have been supported by examples.
Źródło:
Control and Cybernetics; 2023, 52, 1; 35-51
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Planes tangent simultaneously to three spheres
Płaszczyzny jednocześnie styczne do trzech kul
Autorzy:
Łapińska, C.
Ogorzałek, A.
Powiązania:
https://bibliotekanauki.pl/articles/119052.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Geometrii i Grafiki Inżynierskiej
Tematy:
common tangents to two circles
axis
vertex angle of cone
planes tangent to cones
cone circumscribed on sphere
wspólne styczne do dwóch okręgów
oś
kąt wierzchołkowy stożka
płaszczyzny styczne do stożków
stożek opisany na kuli
Opis:
The authors show in simple steps how to reduce the problem of determing planes simultaneously tangent to three spheres for easier construction of tangent planes at the same time to two cones. The method presented here is of great educational importance: it develops spatial thinking by combining different types of surfaces (sphere and cones) an d shows how to use previously known properties to analyze new problems.
Autorki pokazują w kolejnych krokach jak sprowadzić problem wyznaczania płaszczyzn stycznych jednocześnie do trzech danych kul do łatwiejszej konstrukcji płaszczyzn jednocześnie stycznych do dwóch stożków. Prezentowana metoda ma duże walory dydaktyczne: rozwija myślenie przestrzenne analizując związki pomiędzy różnymi rodzajami powierzchni (łącząc stożki i kule) oraz pokazuje, jak w analizie nowego problemu wykorzystać własności poznane wcześniej.
Źródło:
Journal Biuletyn of Polish Society for Geometry and Engineering Graphics; 2017, 30; 33-39
1644-9363
Pojawia się w:
Journal Biuletyn of Polish Society for Geometry and Engineering Graphics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Owady uszkadzające szyszki i nasiona jodły pospolitej Abies alba Mill. w wybranych drzewostanach Puszczy Solskiej
Insects damaging cones and seeds of silver fir Abies alba Mill. in the selected stands of the Solska Forest
Autorzy:
Skrzypczyńska, M.
Lipiński, K.
Powiązania:
https://bibliotekanauki.pl/articles/1009054.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Puszcza Solska
drzewa lesne
jodla pospolita
Abies alba
szkodniki szyszek
szkodniki nasion
barbarowka jodloweczka
Barbara herrichiana
szyszen pospolity
Dioryctria abietella
chylka jodlowka
Earomyia impossible
reseliowka jodlowka
Resseliella piceae
znamionek jodlowiec
Megastigmus suspectus
damage insects
abies alba
cones
seeds
Opis:
Paper presents results of the study on infestation of cones of Abies alba Mill. by insects. They were represented by conophages: Barbara herrichiana Obr. (Lepidoptera: Tortricidae), Dioryctria abietella (Den. et Schiff.) (Lepidoptera: Pyralidae) and Earomyia impossibile Morge (Diptera: Lonchaeidae) as well as seminiphages: Megastigmus suspectus Borr. (Hymenoptera: Torymidae) and Resseliella piceae Seitn. (Diptera: Cecidomyiidae). The cones were collected in the Solska Forest in years 2007−2008.
Źródło:
Sylwan; 2010, 154, 10; 676-683
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimality conditions for a class of relaxed quasiconvex minimax problems
Autorzy:
Diem, H. T. H.
Khanh, P. Q.
Powiązania:
https://bibliotekanauki.pl/articles/205919.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
minimax problem
optimality conditions
convex sublevel sets
normal cones
star subdifferentials
adjusted subdiffer- entials
Opis:
A class of minimax problems is considered. We approach it with the techniques of quasiconvex optimization, which includes most important nonsmooth and relaxed convex problems and has been intensively developed. Observing that there have been many contributions to various themes of minimax problems, but surprisingly very few on optimality conditions, the most traditional and developed topic in optimization, we establish both necessary and sufficient conditions for solutions and unique solutions. A main feature of this work is that the involved functions are relaxed quasi- convex in the sense that the sublevel sets need to be convex only at the considered point. We use star subdifferentials, which are slightly bigger than other subdifferentials applied in many existing results for minimization problems, but may be empty or too small in various situations. Hence, when applied to the special case of minimization problems, our results may be more suitable. Many examples are provided to illustrate the applications of the results and also to discuss the imposed assumptions.
Źródło:
Control and Cybernetics; 2014, 43, 2; 249-260
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the existence of nonnegative radial solutions for p-Laplacian elliptic systems
Autorzy:
Jiang, Daqing
Liu, Huizhao
Powiązania:
https://bibliotekanauki.pl/articles/1294162.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
elliptic system
nonnegative radial solution
existence
fixed point theorem in cones
Opis:
The existence of nonnegative radial solutions for some systems of m (m ≥ 1) quasilinear elliptic equations is proved by a simple application of a fixed point theorem in cones.
Źródło:
Annales Polonici Mathematici; 1999, 71, 1; 19-29
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On localizing global Pareto solutions in a given convex set
Autorzy:
Drwalewska, Agnieszka
Gajek, Lesław
Powiązania:
https://bibliotekanauki.pl/articles/1338686.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
sufficient and necessary conditions for optimality
Pareto optimal solutions
dual cones
feasible directions
Opis:
Sufficient conditions are given for the global Pareto solution of the multicriterial optimization problem to be in a given convex subset of the domain. In the case of maximizing real valued-functions, the conditions are sufficient and necessary without any convexity type assumptions imposed on the function. In the case of linearly scalarized vector-valued functions the conditions are sufficient and necessary provided that both the function is concave and the scalarization is increasing with respect to the cone generating the preference relation.
Źródło:
Applicationes Mathematicae; 1999, 26, 4; 383-394
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Morphogenetic features of talus cones in northwestern Wedel Jarlsberg Land, Spitsbergen
Autorzy:
Nitychoruk, Jerzy
Dzierżek, Jan
Powiązania:
https://bibliotekanauki.pl/articles/2053231.pdf
Data publikacji:
1988
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Spitsbergen
geomorphology
talus cones
Źródło:
Polish Polar Research; 1988, 9, 1; 73-85
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Equivalence of second order optimality conditions for bang-bang control problems. Part 2 : Proofs, variational derivatives and representations
Autorzy:
Osmolovskii, N. P.
Maurer, H.
Powiązania:
https://bibliotekanauki.pl/articles/969736.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
bang-bang control
second order necessary and sufficient conditions
critical cones
equivalence of quadratic forms
representation of the Hessian of the Lagrangian
Opis:
In Part 1 of this paper (Osmolovskii and Maurer, 2005), we have summarized the main results on the equivalence of two quadratic forms from which second order necessary and sufficient conditions can be derived for optimal bang-bang control problems. Here, in Part 2, we give detailed proofs and elaborate explicit relations between Lagrange multipliers and elements of the critical cones in both approaches. The main analysis concerns the derivation of formulas for the first and second order derivatives of trajectories with respect to variations of switching times, initial and final time and initial point. This leads to explicit representations of the second order derivatives of the Lagrangian for the induced optimization problem. Based on a suitable transformation, we obtain the elements of the Hessian of the Lagrangian in a form which involves only first order variations of the nominal trajectory. Finally, a careful regrouping of all terms allows us to find the desired equivalence of the two quadratic forms.
Źródło:
Control and Cybernetics; 2007, 36, 1; 5-45
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 23

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