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    Wyświetlanie 1-11 z 11
    Tytuł:
    Discretization of the stationary distribution of heat in the non-homogeneous body
    Autorzy:
    Bożek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049973.pdf
    Data publikacji:
    2004
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    elliptic partial differential equations
    stationary distribution of heat
    discretization method
    Opis:
    We give a short survey on the theory of the mixed boundary-value problem for the stationary Fourier equation in a non-homogeneous medium defined on any Lipschitz domain $\Omega \rcup \mathbb{R}^{n} (n \ge 2)$. The compatibility condition for the thermal flux has been established by the standard procedure of integration the divergence.
    Źródło:
    Opuscula Mathematica; 2004, 24, 1; 19-33
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Numerical solution for the problem of heat and mass flow in the soil heated with warm air
    Autorzy:
    Bożek, B.
    Kurpaska, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/241006.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    numerical solution
    heat flow
    mass flow
    soils
    warm air
    differential equations
    greenhouse substrate
    system of heating pipes
    explicite-implicite difference scheme
    Opis:
    In this paper a difference method of solving the system of differential equations is presented for differential equations, describing the distribution of temperature and water content in the greenhouse substrate heated with a system of heating pipes. The algorithm of solving the proposed method (explicite-implicite difference scheme) is presented. In addition, the effects of temperature and water content changes obtained from the solution of proposed the model as well as the model where the thermal diffusion of mass was included were compared.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2000, 47, 1-4; 75-96
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation of distribution of temperature in three-dimensional solid changing its shape during the process
    Autorzy:
    Bożek, B.
    Mączka, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/255226.pdf
    Data publikacji:
    2005
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    parabolic partial differential equations
    non-stationary distribution of heat
    finite element method
    Galerkin method
    Opis:
    The present paper suplements and continues [2]. Galerkin method for the Fourier-Kirchoff equation in the case when Omega(t) - equation domain, dependending on time t, is constructed. For special case Omega(t) rcup R2 the computer program for above method is written. Binaries and sources of this program are available on http://wms.mat.agh.edu.pl/~bozek.
    Źródło:
    Opuscula Mathematica; 2005, 25, 2; 169-179
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On some quadrature rules with Gregory end corrections
    Autorzy:
    Bożek, B.
    Solak, W.
    Szydełko, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/255170.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    numerical integration
    quadrature formulas
    summation of series
    Opis:
    How can one compute the sum of an infinite series s := a1 + a2 + ź ź ź ? If the series converges fast, i.e., if the term a(n) tends to 0 fast, then we can use the known bounds on this convergence to estimate the desired sum by a finite sum a1 +a2 +ź ź ź+a(n). However, the series often converges slowly. This is the case, e.g., for the series a(n) = n(-t) that defines the Riemann zeta-function. In such cases, to compute s with a reasonable accuracy, we need unrealistically large values n, and thus, a large amount of computation. Usually, the n-th term of the series can be obtained by applying a smooth function ƒ(x) to the value n: an = ƒ(n). In such situations, we can get more accurate estimates if instead of using the upper bounds on the remainder infinite sum R = ƒ(n + 1) + ƒ(n + 2) + . . ., we approximate this remainder by the corresponding integral I of ƒ(x) (from x = n + 1 to infinity), and find good bounds on the difference I - R. First, we derive sixth order quadrature formulas for functions whose 6th derivative is either always positive or always negative and then we use these quadrature formulas to get good bounds on I - R, and thus good approximations for the sum s of the infinite series. Several examples (including the Riemann zeta-function) show the efficiency of this new method. This paper continues the results from [3] and [2].
    Źródło:
    Opuscula Mathematica; 2009, 29, 2; 117-129
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A note on a family of quadrature formulas and some applications
    Autorzy:
    Bożek, B.
    Solak, W.
    Szydełko, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/255752.pdf
    Data publikacji:
    2008
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    quadrature and cubature formulas
    numerical integration
    Opis:
    In this paper a construction of a one-parameter family of quadrature formulas is presented. This family contains the classical quadrature formulas: trapezoidal rule, mid-point rule and two-point Gauss rule. One can prove that for any continuous function there exists a parameter for which the value of quadrature formula is equal to the integral. Some applications of this family to the construction of cubature formulas, numerical solution of ordinary differential equations and integral equations are presented.
    Źródło:
    Opuscula Mathematica; 2008, 28, 2; 109-121
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Viral hepatitis C in Poland in the Silesian Province between 2005–2014
    Autorzy:
    Braczkowska, B.
    Kowalska, M.
    Barański, K.
    Mendera-Bożek, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/2081675.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    Silesia
    hepatitis C
    epidemiology
    Polska
    Opis:
    Introduction and objective. Viral hepatitis C remains one of the major health and social problems related to infectious diseases in Poland. The aim of the study was assessment of the registered changes in the incidence of HCV in the Silesian Province of western Poland during the last 10 years, including age, gender and place of residence. Materials and method. A retrospective analysis was performed of the HCV incidence between 2005–2014 in the Silesian Province. The crude and standardized incidence rates were calculated for males and females in each year. Subsequently, the territorial diversity of the epidemiological situation in the districts was assessed by calculating the average incidence rate over the entire study period. Results. Incidence rates calculated according to the case definition of 2005 ranged between 5.95/100000 in 2005 to 10.36/100000 in 2014. Analysis of the structure of the incidence showed that during the analyzed period, the majority of hepatitis C cases were related to males (52.5%) rather than females (47.5%), and hepatitis C was more prevalent in younger males (aged 20–49) and older females (aged over 50). After excluding the effect of age, the standardized rates were twice as low, compared to the crude incidence rates. Conclusions. An increase in the HCV incidence rate was observed in males and females. It is obvious that the detection of additional cases will entail the need to provide funding for the treatment of more patients, which should be included in the map of regional health needs in the coming years. Our study demonstrates the temporal and spatial variability of HCV incidence in the Silesian Province of Poland. The observed increase in the crude and standardized rates suggests that the current registry system of HCV in Poland is more effective now. The current situation is comparable with the data in other EU countries.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2018, 25, 2; 224-228
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flowering, pollen characteristics and insect foraging on Campanula bononiensis (Campanulaceae), a protected species in Poland
    Kwitnienie, cechy pyłku oraz owady wizytujące kwiaty chronionego gatunku Campanula bononiensis (Campanulaceae)
    Autorzy:
    Denisow, B.
    Wrzesien, M.
    Bozek, M.
    Jezak, A.
    Strzalkowska-Abramek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/27174.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    flowering
    pollen
    quantity
    population size
    pollen viability
    grassland
    insect foraging
    Campanula bononiensis
    Campanulaceae
    protected species
    Polska
    Opis:
    This study investigated the floral biology and pollen quantity and quality of Campanula bononiensis L. (Campanulaceae), a protected species in Poland. Observations and measurements were made during the years 2007–2009 in natural phytocoenoses from the Festuco-Brometea class situated within the Lublin area, SE Poland. A considerable decrease (approx. 87%) in population density was observed. Significant variations both in the amount of pollen (18.5%–34.8 % of pollen in the total anther dry weight, i.e. 0.5–1.5 mg per 10 anthers) and in pollen viability (38.8–97.0%) were noted. Both a low amount of pollen and low pollen viability may reduce the reproductive success of individuals. The most frequent visiting insects were bees (Apoidea), including solitary bees 45.7%, honeybees 20.4%, and bumblebees 11.4%. Dipterans, coleopterans (weevils), lepidopterans and ants were also recorded, implying a strong impact of C. bononiensis on insect biodiversity within grasslands.
    W pracy przedstawiono wyniki badań dotyczą- ce aspektów kwitnienia, cech ilościowych i jakościowych pyłku Campanula bononiensis L. (Campanulaceae), gatunku objętego w Polsce ustawową ochrony. Obserwacje prowadzono latach 2007–2009, w naturalnej fitocenozie z klasy Festuco-Brometea zlokalizowanej w Lublinie. Zanotowano znaczny, ok. 87% spadek zagęszczenia populacji. Poza procesami sukcesyjnymi, prowadzącymi do zarastania murawy, zanikanie populacji C. bononiensis może być związane z wewn ętrznymi czynnikami biologicznymi, np. ilością i jakością wytwarzanego pyłku. W latach badań zanotowano znaczne wahania w ilości produkowanego pyłku (18.5%–34.8 % suchej masy pylników, tj. 0.5–1.5 mg z 10 pylników) oraz istotne zróżnicowanie jego żywotno ści (38.8-97.0%). Najczęściej obserwowanymi owadami wizytuj ącymi kwiaty były owady pszczołowate (Apoidea). Pszczoły samotnice stanowiły 45.7% ogólnej liczebno ści owadów, 20.4% wyniósł udział pszczoły miodnej, a 11.4% stanowiły różne gatunki z rodzaju Bombus. Obserwowano również muchówki, chrząszcze – ryjkowce, motyle oraz mrówki, co świadczy o dużym wpływie C. bononiensis na bioróżnorodność owadów w obrębie muraw ciepłolubnych.
    Źródło:
    Acta Agrobotanica; 2014, 67, 2
    0065-0951
    2300-357X
    Pojawia się w:
    Acta Agrobotanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Infrared Optical and X-Ray Determination of Parameters for MOVPE Grown InAs$\text{}_{1-x}$Sb$\text{}_{x}$ Epilayers
    Autorzy:
    Marszałek, B.
    Zielińska-Rohozińska, E.
    Bożek, R.
    Stępniewski, R.
    Witowski, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968371.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    78.20.-e
    78.30.-j
    Opis:
    The experimental room-temperature transmission of metalorganic vapour phase epitaxy grown InAsSb epilayers is compared with calculations based on a Kane model of the band structure. The band structure parameters are found. The composition of the samples was determined by X-ray diffraction.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 919-922
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nectar production in several Campanula species (Campanulaceae)
    Autorzy:
    Strzałkowska-Abramek, M.
    Jachuła, J.
    Wrzesień, M.
    Bożek, M.
    Dąbrowska, A.
    Denisow, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/11866767.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    plant cultivation
    Campanulaceae
    Campanula
    Campanula glomerata
    Campanula persicifolia
    Campanula trachelium
    ornamental plant
    flowering plant
    flower longevity
    male phase
    female phase
    nectar production
    sugar content
    bee pasture
    Opis:
    The flowering, nectar production and sugar content were examined in 2012–2013 seasons for three Campanula species (C. persicifolia L., C. glomerata L., C. trachelium L.). The flowers of all studied Campanula spp. are distinctly protandrous; most of them opened between 10.00 and 14.00; only the flowers of C. glomerata continued the opening process until 16.00 (GMT + 2 h). The flower life-span differed between species and was the longest for C. persicifolia – ca. 5.5 days and lasted 3.0–3.5 days in C. glomerata and C. trachelium. The duration of the male phase was 2–3 fold shorter (C. persicifolia and C. glomerata) than the female phase or was equal (C. trachelium). Irrespective of the year of study and the species, the female-biased nectar production pattern was evidenced. The amount of nectar accumulated at the female phase reached 70–87% of the maximum nectar produced by a flower. The total sugar yield (0.4– 12.2 g/10 m2) established for the studied species is low compared to other herbaceous meadow species. However, due to diverse insect visitors groups, the Campanula flowers can be recommended to support pollinators in home gardens or on idle lands.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2018, 17, 3; 127-136
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spatially Resolved Micro-Luminescence from GaN/AlGaN Quantum Dots
    Autorzy:
    Chwalisz, B.
    Wysmołek, A.
    Bożek, R.
    Stępniewski, R.
    Pakuła, K.
    Kossacki, P.
    Golnik, A.
    Baranowski, J. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038084.pdf
    Data publikacji:
    2004-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Cr
    78.66.Fd
    78.67.Hc
    75.75.+a
    68.65.Hb
    Opis:
    We report on the optical experiments performed on low density GaN/AlGaN quantum dots grown on sapphire substrate using SiN during the growth process. The existence of quantum dots in the investigated structures was confirmed by atomic force microscopy. Although macro-luminescence of the investigated structures consist of broad emission lines the micro-photoluminescence experiments performed with the spatial resolution of 0.25 μm revealed sharp emission lines from the individual quantum dot in the energy range of 3.20-3.55 eV. It is shown that the magnetic fields up to 7 T do not influence significantly the electronic states of the dots.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 6; 517-521
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Localization Effects in GaN/AlGaN Quantum Well - Photoluminescence Studies
    Autorzy:
    Chwalisz, B.
    Wysmołek, A.
    Bożek, R.
    Korona, K. P.
    Stępniewski, R.
    Knap, W.
    Pakuła, K.
    Baranowski, J. M.
    Grandjean, N.
    Massies, J.
    Prystawko, P.
    Grzegory, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036024.pdf
    Data publikacji:
    2003-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Cr
    73.20.-r
    73.21.-b
    74.40.+k
    Opis:
    Exciton localization in GaN/AlGaN quantum well structures is studied by photoluminescence. An anomalous temperature behavior of the photoluminescence from the quantum well is observed. With increasing temperature the energy position of the excitonic emission line first decreases up to 20 K, then increases, reaching a maximum around 90 K, and then decreases again in the higher temperature range. The observed behavior is discussed in terms of localization at the interface potential fluctuations. It is argued that the temperature activated migration and subsequent release of the excitons from traps that occurs between 20 K and 90 K are responsible for the observed S-like shape of the energy dependence. The obtained results allow a direct characterization of the energy fluctuations present in GaN/AlGaN quantum wells grown by different techniques.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 6; 573-578
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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