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Wyświetlanie 1-15 z 75
Tytuł:
Synthesis of heaviest nuclei and heaviest chemical elements
Autorzy:
Sobiczewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/146684.pdf
Data publikacji:
2011
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
heaviest nuclei
heaviest chemical elements
nuclear reactions
alfa-decay energy
alfa-decay half-life
alfa-decay genetic chains
Opis:
Studies of the heaviest nuclei and heaviest chemical elements are shortly described. Methods of synthesis and identification of these nuclei are discussed. Some details of the studies are illustrated on the example of the nucleus 277Cn, the isotope of the element 112 (copernicium) the discovery of which has been recently approved by IUPAC. General results of the research on superheavy nuclei (atomic number Z = 104–118), synthesized within the period from 1969 (discovery of rutherfordium, Z = 104) up to the present are outlined.
Źródło:
Nukleonika; 2011, 56, 3; 212-216
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Differences in the relationship between bacterial count decay and storage time in Antarctic freshwater samples
Autorzy:
Allende, Luz
Powiązania:
https://bibliotekanauki.pl/articles/2051915.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctica
bacterioplankton
count decay
storage
Źródło:
Polish Polar Research; 2006, 27, 1; 63-69
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Mechanical Energy Loss in Steady Flow by Means of Dissipation Power
Autorzy:
Artichowicz, W.
Sawicki, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/241274.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
energy decay rate
energy loss
Opis:
When systems of simple geometry like pipes or regular channels are considered, the mechanical energy loss of the fluid flow can be expressed by local and longitudinal empirical energy loss coefficients. However, in the case of large spatially distributed objects, there are no simple approaches to this task. In practice, general recommendations addressing different types of objects are used, but they usually provide very coarse estimates of energy loss. In this work, a new methodology for determination of mechanical energy loss in steady flowis proposed. This methodology is based on the observation that the magnitude of the power of energy dissipation in turbulent flow can be determined using the averaged flow velocity and turbulent viscosity coefficient. To highlight this possibility, an analysis of the magnitudes of the power of the main and fluctuating components of turbulent flow is presented. The correctness of the method is verified using an example of laminar and turbulent flows in a circular pipe. The results obtained show clearly that the proposed methodology can be used for mechanical energy loss determination in flow objects. This methodology can be used as a basis for mechanical energy loss determination in different types of flow objects.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2017, 64, 2; 73-85
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Poet of Decay and Psychic Entropy: The Intersection of Surrealism and Science in J. G. Ballard’s Fiction
Autorzy:
Tereszewski, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2013227.pdf
Data publikacji:
2021
Wydawca:
Komisja Nauk Filologicznych Polskiej Akademii Nauk, Oddział we Wrocławiu
Tematy:
J
G
Ballard
surrealism
entropy
decay
Opis:
Images of decay, both psychological and physical, permeate much of J.G. Ballard’s fiction, creating in effect a unique aesthetic that has acquired the eponymous description “ballardian.” This imagery, stemming from the surrealist tradition, is more than aesthetic affectation; it is, as this article argues, the manifestation of an eschatological theme underlying much of New Wave science fiction. This article also addresses how scientific discourse, especially references to entropy, and surrealist aesthetics intersect in his novels (High-Rise and The Drowned World) to provide a metaphor for Ballard’s frequent use of decay imagery. Though the surrealist component of his imagination has been well documented, what still invites closer scrutiny are the ideological assumptions linking Ballard’s incorporation of surrealism with the work of other surrealists and the way Ballard develops this theme for his own purposes.
Źródło:
Academic Journal of Modern Philology; 2021, 14; 337-346
2299-7164
2353-3218
Pojawia się w:
Academic Journal of Modern Philology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New species of corticioid fungi (Basidiomycota) for Poland found in Białowieża Primeval Forest in 2018-2020
Autorzy:
Yurchenko, Eugene
Wołkowycki, Marek
Powiązania:
https://bibliotekanauki.pl/articles/11881008.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
Aphyllophorales
geography
micromorphology
Polyporales
wood decay basidiomycetes
Opis:
Eight new species of fungi (Acanthobasidium norvegicum, Amylocorticium laceratum, Hyphoderma transiens, Odonticium septocystidiatum, Phlebia cretacea, Ph. subulata, Steccherinum albidum, and Tubulicrinis calothrix) were identified for Poland after a study of collections from large forests situated in the northeast part of the country. Leptosporomyces fuscostratus was confirmed for Polish mycobiota. Main diagnostic features, natural range, substratum preferences, and taxonomic position of these species are discussed. Color images of basidiomata for 9 species, line drawings of microscopic structures for 6 species, and scanning electron microscopy images of important microstructures for 4 species are provided.
Źródło:
Acta Mycologica; 2022, 57; 577
0001-625X
2353-074X
Pojawia się w:
Acta Mycologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pathways of tRNA turnover in eukaryotic cells
Autorzy:
Turowski, T. W.
Powiązania:
https://bibliotekanauki.pl/articles/115770.pdf
Data publikacji:
2011
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
tRNA turnover
rapid tRNA decay
polymerase III
Opis:
Cell ability to control amount of a transfer RNA is one of the ways to regulate rate of protein synthesis. Because 80–90% dry mass of cells are proteins, the level of translation is determinant to the cell growth. Growth of cells is a key question in tumors therapy and biotechnology. tRNA turnover consist of a three pathways described in a last few years: exosome and TRAMP complex dependent pathway in nucleus, directed to hypomodified or affected tRNA; rapid tRNA decay pathway involving two 5’–3’ exonucleases Rat1 and Xrn1, proposed to occur in nucleus and cytoplasm; stress-activated endonucleolytic cleavage to tRNA halves pathway, founded in cytoplasm with a clear role to direct regulation of translation by tRNA half-molecules inhibition.
Źródło:
Challenges of Modern Technology; 2011, 2, 2; 63-65
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
General decay rate of a weakly dissipative viscoelastic equation with a general damping
Autorzy:
Khaleel, Anaya
Messaoudi, Salim A
Powiązania:
https://bibliotekanauki.pl/articles/1397338.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
general decay
relaxation function
viscoelastic
weakly dissipative equation
Opis:
In this paper, we consider a weakly dissipative viscoelastic equation with a nonlinear damping. A general decay rate is proved for a wide class of relaxation functions. To support our theoretical findings, some numerical results are provided.
Źródło:
Opuscula Mathematica; 2020, 40, 6; 647-666
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uniform energy decay rates of hyperbolic equations with nonlinear boundary and interior dissipation
Autorzy:
Lasiecka, I.
Triggiani, R.
Powiązania:
https://bibliotekanauki.pl/articles/970305.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
non-linear hyperbolic equations
uniform energy decay rates
Opis:
We consider the problem of uniform stabilization of nonlinear hyperbolic equations, epitomized by the following three canonical dynamics: (1) the wave equation in the natural state space L2(Ω) x H^-1(Ω), under nonlinear (and non-local) boundary dissipation in the Dirichlet B.C., as well as nonlinear internal damping; (2) a corresponding Kirchhoff equation in the natural state space [wzór), under nonlinear boundary dissipation in the 'moment' B.C. as well as nonlinear internal damping; (3) the system of dynamic elasticity corresponding to (1). All three dynamics possess a strong, hard-to-show 'boundary → boundary' regularity property, which was proved, also by invoking a micro-local argument, in Lasiecka and Triggiani (2004, 2008). This is by no means a general property of hyperbolic or hyperbolic-like dynamics (Lasiecka and Triggiani, 2003, 2008). The present paper, as a continuation of Lasiecka and Triggiani (2008), seeks to take advantage of this strong regularity property in the case of those PDE dynamics where it holds true. Thus, under the above boundary → boundary regularity, as well as exact controllability of the corresponding linear model, uniform stabilization of nonlinear models is obtained under minimal nonlinear assumptions, provided that a corresponding unique continuation property holds true. The treatment of the present paper is cast in the abstract setting (Lasiecka, 1989, 2001; Lasiecka and Triggiani, 2000, Ch. 7, 2003, 2008), which is proper for these hyperbolic dynamics and recovers the results of Lasiecka and Triggiani (2003, 2008) in the absence of the nonlinear interior damping, in particular in the linear case.
Źródło:
Control and Cybernetics; 2008, 37, 4; 935-969
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Terrigenous organic matter and formation of siderite in the Bathonian Ore-Bearing Clay Formation at Gnaszyn, Poland : a petrochemical study
Autorzy:
Lis, Kacper
Wojtulek, Piotr
Lis, Grzegorz
Jelonek, Iwona
Powiązania:
https://bibliotekanauki.pl/articles/2171817.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
organic matter
kerogen
siderite concretions
microbial decay
Jurassic
Opis:
The Bathonian Ore-Bearing Clay Formation, outcropping in the Gnaszyn open-pit mine at Częstochowa (Poland), includes several horizons of abundant iron carbonate concretions. The cores of the concretionary bodies commonly contain organic matter (OM), dominated by fragments of wood. These organic particles usually display well-preserved primary structures and occur rarely as more deformed and/or completely degraded fragments. Their original structures are frequently replaced by or filled with secondary mineralization, mostly represented by pyrite. The maceral composition of the OM of the wood fragments is dominated by huminite with subordinate inertinite and resinite. Vitrinite reflectance analyses revealed values lower than 0.45%. The total organic carbon content (TOC) displayed variable results between 2% and 18%. Rock-Eval analyses revealed low amounts of hydrogen (< 45 mg HC/g TOC) and relatively high amounts of oxygen (up to 136 mg CO2/g TOC). Analysed samples contained small quantities of free hydrocarbons (S1 peak < 0.26 mg HC/g rock) as well as hydrocarbons, generated during pyrolysis (S2 peak < 7.05 mg HC/g rock). These features are characteristic for immature type IV kerogen of terrigenous origin. However, the maceral composition and frequent occurrence of siderite affecting the Rock-Eval parameters may indicate that the original kerogen belonged to type III. According to previous authors, the OM of terrigenous origin was delivered to well-oxygenated water of the palaeo-basin in the Częstochowa area. The present data indicate that intensive biodegradation of this OM at shallow burial depleted the oxygen supply within the sediment, driving the pore water into dys- or anoxic conditions. The activity of microorganisms in reducing iron and/or sulphates became the dominant biodegradation reaction, introducing Fe2+ and HCO3- ions into the system. Negative δ13C values in the cortex of the concretions analysed indicate that the bicarbonate consumed in siderite precipitation was supplied by this microbial activity. The reducing microenvironments developed in the sediment and wood fragments acted as nucleation sites for siderite precipitation.
Źródło:
Annales Societatis Geologorum Poloniae; 2022, 92, 3; 295--312
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Global solutions for a nonlinear Kirchhoff type equation with viscosity
Autorzy:
Lapa, Eugenio Cabanillas
Powiązania:
https://bibliotekanauki.pl/articles/29519609.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
global solutions
nonlinear Kirchhoff type problem
exponential decay
Opis:
In this paper we consider the existence and asymptotic behavior of solutions of the following nonlinear Kirchhoff type problem $ u_{t t} - M ( \int_\Omega | \nabla u |^2 dx ) \Delta u - \delta \Delta u_t = \mu | u |^{p-2} u $ in $ \Omega \times ]0, \infty [ $ where $ M(s) = $ ⎧ $ a - bs $ for $ s \in [0, a/b [$, ⎨ ⎩ $ 0, $ for $ s \in [ a/b, + \infty ] $. If the initial energy is appropriately small, we derive the global existence theorem and its exponential decay.
Źródło:
Opuscula Mathematica; 2023, 43, 5; 689-701
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of excitation migration on the decay of excited states via electron transfer to acceptors
Autorzy:
Gutman, M.
Hilczer, M.
Tachiya, M.
Powiązania:
https://bibliotekanauki.pl/articles/147856.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
electron transfer
energy migration
simulation
fluorescence decay
polymer matrix
Opis:
Simulation of fluorescence quenching due to electron transfer from a photoexcited donor to an acceptor, in a rigid matrix has been performed. The model assumes competition between processes of the electron transfer and the resonant excitation energy transfer among donors. Electron and energy transfers are described in terms of the Marcus and the Förster theories, respectively. Dependence of the fluorescence quenching on the donor concentration and on the parameters of the Marcus and Förster equations has been investigated at a fixed acceptor concentration. Fluorescence decay curves calculated for various concentrations of donors have been compared with experimental decays.
Źródło:
Nukleonika; 2005, 50,suppl.2; 39-43
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Existence and decay of finite energy solutions for semilinear dissipative wave equations in time-dependent domains
Autorzy:
Nakao, Mitsuhiro
Powiązania:
https://bibliotekanauki.pl/articles/1397374.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
energy decay
global existence
semilinear wave equation
noncylindrical domains
Opis:
We consider the initial-boundary value problem for semilinear dissipative wave equations in noncylindrical domain $\cup_{0 \leq t \leq \infty} \Omega(t) \times \{t\} \subset \mathbb{R}^N \times \mathbb{R}$. We are interested in finite energy solution. We derive an exponential decay of the energy in the case Ω(t) is bounded in $\mathbb{R}^N$ and the estimate $\int_0^\infty E(t)dt \leq C(E(0), ||u(0)||) < \infty $ in the case Ω (t) is unbounded. Existence and uniqueness of finite energy solution are also proved.
Źródło:
Opuscula Mathematica; 2020, 40, 6; 725-736
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trophic Abilities of Trametes Gibbosa (Polyporales, Basidiomycota) With Respect to The Wood of Fagus Sylvatica
Autorzy:
Piętka, Jacek
Szczepkowski, Andrzej
Ronikier, Michał
Saługa, Marta
Powiązania:
https://bibliotekanauki.pl/articles/27323534.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Tematy:
wood decay fungi
white rot
fungal inoculation
molecular identification
Opis:
Trametes gibbosa is a widespread polypore fungus occurring throughout Europe and Asia. It is considered a saprotroph occasionally exhibiting parasitic activity. The aims of the present experimental work were to: (1) determine the ability of T. gibbosa pure culture to decompose beech wood under laboratory conditions, (2) test the trophic abilities of T. gibbosa by comparative analysis of the development of its mycelium inoculated into the stems of living beech trees and into beech rollers (stem segments – dead substrate). The laboratory wood decay experiment revealed considerable weight loss of the beech wood samples exposed to T. gibbosa (32.7% after 120 days). Identification of the mycelium used for inoculation in natural forest conditions was done by morphological analysis of the cultures and molecular barcoding. Attempts to recover T. gibbosa mycelium were made after two and eight years for the living trees, and after two years for the rollers. While T. gibbosa could not be reisolated from the inoculated beech trees, basidiomata were observed on the beech rollers, and genetically verified T. gibbosa mycelium was extracted from them. We conclude that T. gibbosa exhibits strong saprotrophic inclinations.
Źródło:
Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2023, 66, 211; Art. no. 1644-3985.413.08
1644-3985
Pojawia się w:
Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mass spectrometric analysis of head-to-tail connected cyclic peptides.
Autorzy:
Macht, Marcus
Pelzing, Matthias
Palloch, Petra
Sauerland, Volker
Volz, Jürgen
Powiązania:
https://bibliotekanauki.pl/articles/1044055.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
electrospray
post source decay
MALDI
mass spectrometry
peptide sequencing
Opis:
Tandem mass spectrometry is an extremly useful tool for high sensitive sequence identification of peptides. In the case of cyclic peptides fragmentation can easily be performed for sequence analysis. However, analysis is usually tedious due to the lack of a defined beginning and end of the sequence. Since cyclic peptides are a highly interesting class of compounds especially for the pharmaceutical industry, ways have to be found to identify their structures. In this work we demonstrate how software and dedicated analytical strategies can be used for detailed analysis of these substances.
Źródło:
Acta Biochimica Polonica; 2001, 48, 4; 1109-1112
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interaction of heavy aircraft wakes
Wzajemne oddziaływanie wirów zaskrzydłowych dużych samolotów
Autorzy:
Bugała, P.
Dziubiński, A.
Powiązania:
https://bibliotekanauki.pl/articles/213035.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
CFD
vortex decay
vortex interaction
rozpad wirów
oddziaływanie wirów
Opis:
In the next few years the problem of heavy aircraft wakes may increase on the account of continuous air transport growth. However, it can be noticed that even today the number of accidents resulting from an interaction with wakes is increasing. That is the reason why methods of wake vortex description should be searched for. The aim of this study is to analyze interaction of example aircraft wakes. In this paper the characteristics of vortex wake behind three-dimensional wing arc presented. It shows how a separation between aircraft affects the decay of vortex. Two- and three-dimensional calculations were performed using commercial RANS code. The following cases have been taken into consideration: flow past a full commercial aircraft, three-dimensional flow over the simplified wing and a two-dimensional analysis of vortex decay caused by the landing aircraft, including the separation effect. For all these cases a CFD simulation of the aircraft wakes was conducted. One of the main outcome of this work is a confirmation that the interaction between wakes consists of spreading out and lifting wakes. The achieved results show that the two-dimensional simulation is a sufficient tool for a preliminary analysis of wake vortices. Conclusions from this analysis can be used by the managements of busy international airports to enhance safety.
W ciągu kilku kolejnych lat, problem wirów powstających za ciężkimi samolotami, może wzrastać z powodu rozwoju ruchu lotniczego. Jednak już dziś można zauważyć rosnącą liczbę wypadków spowodowanych interferencją z wirami. To jest powód, dla którego metody opisu wirów powinny stać się przedmiotem badań. Celem niniejszej pracy jest analiza interferencji wirów powstających za wybranym samolotem pasażerskim. W artykule zaprezentowano charakterystykę zaburzenia powstającego za trójwymiarowym skrzydłem. Niniejsza praca ukazuje wpływ separacji między samolotami na rozpad wirów. Dwu- i trójwymiarowe obliczenia zostały wykonane przy użyciu komercyjnego kodu RANS. Następujące przypadki zostały wzięte pod uwagę: przepływ za pełno wy miarowym samolotem komercyjnym, trójwymiarowa analiza wirów za uproszczonym skrzydłem oraz dwuwymiarowa symulacja rozpadu wirów za lądującymi samolotami z uwzględnieniem separacji. Dla wszystkich tych przypadków zostały przeprowadzone analizy CFD. Jednym z najistotniejszych rezultatów pracy jest potwierdzenie, że interakcja pomiędzy zaburzeniami polega na rozchodzeniu i unoszeniu się wirów. Uzyskane wyniki pokazują, że obliczenia dwuwymiarowe są wystarczające do wstępnej analizy wirów. Wnioski tych analiz mogą być wykorzystane przez zarządy zatłoczonych, międzynarodowych lotnisk do utrzymania odpowiedniego poziomu bezpieczeństwa.
Źródło:
Prace Instytutu Lotnictwa; 2016, 4 (245); 309-320
0509-6669
2300-5408
Pojawia się w:
Prace Instytutu Lotnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 75

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