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    Wyświetlanie 1-45 z 45
    Tytuł:
    Variability of macroelements content in soils of a young glacial river valley - a geochemical landscape approach
    Autorzy:
    Sowiński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/962841.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Opis:
    The content and relationships between amounts of macroelements (Ca, Mg, K, Na and Fe) and soil properties along three catenas in the young glacial Łyna River valley, NE Poland, are discussed in the paper. The results were presented against the background of four geochemical landscapes distinguished within the study area: eluvial / trans-eluvial, eluvial accumulative, trans-super-aqual and super-aqual. The middle part of the Łyna River valley is covered with Fluvic Phaeozems and Dystric Fluvisols formed from sands, loams and silts. In some parts, Mollic Gleysols (Limnic) formed from peats and gyttja occur. In the areas adjacent to the floodplain, Eutric Umbrisols (Pantocolluvic) and Haplic Umbrisols (Colluvic) formed from loams, silts and clays are located. The upper slope of the valley is covered by Luvic Pheazems, Luvic Umbrisols, Brunic Dystric Arenosols and Dystric Arenosols The average content of macroelements reached: Cat – 6.60 g kg-1, CaHCl – 3.17 g kg-1, Mgt – 2.79 g kg-1, MgHCl – 0.68 g kg-1, Kt – 7.27 g kg-1, KHCl – 0.20 g kg-1, Nat – 0.84 g kg-1, NaHCl – 0.22 g kg-1, Fet – 8.72 g kg-1 and FeHCl – 5.48 g kg-1. Th content of macroelements in soils of the analysed area was varied between the four geochemical landscapes. The analysis, supported by PCA ordination, resulted in significant positive relations between the macroelement contents and silt (0.05-0.002 mm) and clay (<0.002 mm) soil fractions, CaCO3, pHKCl and amounts of organic matter, as well as an inverse relation to the share of sandy (2.0-0.05 mm) soil fraction. Soils in super-aqual geochemical landscape were the most abundant in macroelements (except KHCl and Nat). The most typical sites of macroelement accumulation were the following geochemical landscapes: super-aqual > trans-super-aqual > eluvial accumulative > eluvial / trans-eluvial.
    Źródło:
    Journal of Elementology; 2016, 21, 4
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical activity of Polish adolescents and young adults according to IPAQ: a population based study
    Autorzy:
    Bergier, J.
    Kapka-Skrzypczak, L.
    Bilinski, P.
    Paprzycki, P.
    Wojtyla, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/50624.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Medycyny Wsi
    Opis:
    The alarming problem of a decline in physical activity among children and adolescents and its detrimental effects on public health has been well recognised worldwide. Low physical activity is responsible for 6% of deaths worldwide and 5-10% of deaths in the countries of the WHO European Region, according to country. Within the last decade, many initiatives have been launched to counteract this phenomenon. The objective of presented study was analysis of the level of physical activity among adolescents and young adults in Poland, according to the IPAQ questionnaire. The study group covered 7,716 adolescents: 5,086 children attending high school and secondary schools and 2,630 university students. Low physical activity was noted among 57% of schoolchildren and 20.84% of students. Analysis of the level of physical activity according to the IPAQ indicated that it was lower among girls, compared to boys. An additional analysis, with the consideration of the place of residence, showed that the highest percentage of the population with low physical activity was noted in the rural areas (29.30%), while among the urban inhabitants of cities with a population above 100,000 it was on the level of 23.69% and 20.57%. Median for weekly physical activity by respondents` gender was on the level of 1,554.00 MET*min. weekly among females, and 2,611.00 MET*min. weekly among males (p<0.000). The highest weekly physical activity expressed in MET*min. was observed among the inhabitants of towns with a population less than 100,000, whereas among the rural population and inhabitants of large cities with a population of over 100,000 the weekly physical activity was on a similar level (1,830.50 and 1,962.00 respectively). An extended analysis of respondents’ physical activity showed that during the day students spend significantly more time in a sedentary position, compared to schoolchildren. The presented results of studies indicate the necessity to continue and intensify actions to promote various forms of physical activity among students and schoolchildren. A constant decrease in physical activity observed among children and adolescents suggests that it is necessary to pay greater attention to this social group while developing health programmes.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2012, 19, 1
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tourist activity of young people as a factor contributing to their health and proper development
    Autorzy:
    Biernat, E.
    Tomaszewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/50844.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Medycyny Wsi
    Opis:
    Introduction and Objective: The aim of this paper is to assess the level of tourist activity of pupils and students from schools in Warsaw, as well as factors influencing this level of activity. Methods: A two-part questionnaire was used that included questions related to participation in tourist trips (day, long, short, and trips abroad) and the International Physical Activity Questionnaire (IPAQ). Results: Among the analyzed factors (gender, level of school, level of physical activity), only the level of school turned out to be the factor which significantly (p=0.000) influenced the physical activity of the respondents. It was observed that tourist activity among pupils and students decreased with age. Conclusion: There is an urgent need for a systematic approach towards promoting and supporting the participation of children and young people in tourism. as well as setting examples of how to travel and rest. Carrying out intervention programmes demands the further identification of factors determining them (e.g. influence of parents’ leisure time behaviour), as well as the application of standardized research tools.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2013, 20, 3
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distribution of small, water - filled depressions as a component of the analysis of icesheet retreat dynamics in young glacial areas
    Autorzy:
    Pieńkowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/294544.pdf
    Data publikacji:
    2008
    Wydawca:
    Stowarzyszenie Geomorfologów Polskich
    Tematy:
    kettle holes
    ponds
    icesheet retreat dynamics
    young glacial areas
    Opis:
    The young glacial landscape of the nonhern Europe features numerous post-glacial structures, including drainless relief depressions which are usually filled with ater and are called ponds or kettle holes. Their prestence in Western Pomerania is associated mainly with a zonal arrangement of glacial forms related 10 the retreating icesheet front. Distribution of kettle holes was analysed in a region where their density is highly variable. The study covered mainly the Wełtyń Plateau, the Myślibórz. Lakeland, and the northern part of the Gorzów Plateau. About 11 thousand kettle holes smaller than 1.0 ha, marked on the late 19th century 1:25,000 topographic maps, were included in the analysis. The analysis of the kettle hole distribution, conducted with the aid of GIS software and spatial analysis statistics, demonstrates that the distribution of kettle hole dusters, the shape of the surrounding vegetation patches, and the kettle hole duster alingment may be important components of the retreat reconstruction. The elements mentioned, when factored in the analysis, may contribute to, i.a., understanding of the direction of the ice movement and the sequence of the icesheet front ranges.
    Źródło:
    Landform Analysis; 2008, 6; 41-46
    1429-799X
    Pojawia się w:
    Landform Analysis
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Remarks about discrete Young measures and their Monte Carlo simulation
    Autorzy:
    Grzybowski, A.
    Puchała, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/122542.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    Young measures
    Monte Carlo simulation
    simple function
    piecewise affine function
    miara Younga
    symulacja Monte Carlo
    funkcja prosta
    Opis:
    This article is devoted to the problem of simulation of random variables distributed according to Young measures associated with piecewise affine functions determined on bounded intervals. We start with simple functions which can take on a finite number of different values with inverse images being the intervals or their unions. We present some formal results connected with related discrete Young measures and propose an algorithm for generating random variables having such distributions. Next, based on these results we introduce an algorithm designed for approximation of Young measures in various, more general situations. We also present an example where a Young measure associated with a piecewise affine function is approximated with the help of computer simulations. In this benchmarking problem the theoretical results are compared with the ones obtained in the Monte Carlo experiment.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2015, 14, 2; 13-20
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aboveground biomass allocation and accumulation in a chronosequence of young Pinus sylvestris stands growing on a lignite mine spoil heap
    Autorzy:
    Jagodzinski, A.M.
    Kalucka, I.
    Horodecki, P.
    Oleksyn, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/41764.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    aboveground biomass
    allocation
    accumulation
    chronosequence
    age
    young plant
    Pinus sylvestris
    stand
    lignite mine
    spoil heap
    Opis:
    It is not clear to what extent trees growing on anthropogenic sites change their growth and biomass allocation to different organs. We assessed the aboveground biomass in a chronosequence of six Scots pine monocultures (between 6 and 20 years old) to examine how precisely the site-specific or control allometric equations may reflect the value of biomass accumulation and allocation in stands growing in harsh site conditions on the overlayer spoil heap made as a result of opencast brown coal mining. The site is characterized by poor edaphic and water conditions and nutrient deficiency. The control equations were developed from Scots pine stands growing on post-agricultural lands in the close vicinity of the spoil heap. We found that equation type significantly influenced results of predicted biomass accumulation for all biomass components studied (although results were only marginally significant for total aboveground biomass, P=0.08). Total aboveground biomass in younger stands (6–9 years old) estimated using site-specific equations was >40% higher and for older stands (17–20 years old) from 7 to 27% lower than estimated using equations developed for the control sites. Our study revealed that under harsh environmental conditions in spoil heaps, biomass of young Scots pine stands significantly differ from values calculated based on control equations developed for more fertile soils with better water conditions in the same region. The control biomass equations may not be suitable to estimate biomass accumulation in stands growing on infertile habitats with poor water conditions, if the control equations are developed for nearby stands but growing under better site conditions.
    Źródło:
    Dendrobiology; 2014, 72
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Does home-based vision therapy affect symptoms in young adults with convergence insufficiency?
    Autorzy:
    Nawrot, P.
    Michalak, K. P.
    Przekoracka-Krawczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/173398.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    asthenopia
    convergence insufficiency
    exophoria
    exotropia
    eyestrain
    symptom survey
    vision therapy
    Opis:
    The purpose of this study was to investigate the effectiveness of extended home-based vision therapy as a treatment for symptomatic convergence insufficiency (CI) in young exophoric adults. Twenty-four adults with symptomatic exophoria at near with convergence insufficiency were divided into an experimental and a control group. The experimental group received 24 weeks of vision training, while the control group received no therapy. The three major outcome measures were the scores on the convergence insufficiency symptom survey V15 (CISS-V15), the near point of convergence and the positive fusional vergence at near. Only subjects from the experimental group demonstrated statistically and clinically significant changes in the CISS-V15 score (improvement of 20 points), near point of convergence (improvement of 5.5 cm) and positive fusional vergence at near (improvement of 15 Δ). No significant changes of either symptoms or signs were evident for the control group. The results presented in this study showed that extending the time and number of home based therapy techniques might be an effective treatment modality in adult subjects with CI. This therapy might be an alternative way for treatment of symptomatic exophoric CI subjects, who cannot attend office sessions.
    Źródło:
    Optica Applicata; 2013, 43, 3; 551-566
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    "Puszcza Slupecka" Nature Reserve near Warsaw as an example of a young forest abundant in ancient-forest species
    Autorzy:
    Dembicz, I.
    Zaniewski, P.
    Kozub, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/878438.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Przyrodniczy w Poznaniu
    Źródło:
    Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana; 2012, 16
    1896-1908
    Pojawia się w:
    Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new species of the metriorhynchid crocodylomorph Cricosaurus from the Upper Jurassic of southern Germany
    Autorzy:
    Sachs, S.
    Young, M.T.
    Abel, P.
    Mallison, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/22510.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    Here we describe a new species of the metriorhynchid thalattosuchian Cricosaurus, C. bambergensis sp. nov., from the Upper Jurassic Torleite Formation of Wattendorf near Bamberg, Bavaria (southern Germany). The holotype and only known specimen is a nearly complete skeleton that shows a number of diagnostic traits including a bicarinate dentition formed by labiolingually compressed tooth crowns that lack a conspicuous enamel ornamentation and the presence of a distinct midline ridge with paired depressions on the palatines. Our phylogenetic analysis recovers a grouping of Cricosaurus bambergensis sp. nov. with C. elegans and C. suevicus. The implications of the new Cricosaurus species to the species complex from the late Kimmeridgian–early Tithonian of southern Germany is discussed. Our description of C. bambergensis demonstrates that the specific, and morphological, diversity of Cricosaurus in southern Germany was higher than previously thought. This coincides with the recent trend of re-evaluating the species-complexes of extant taxa, and the identification of new “cryptic species”. As such, the crocodylomorph fossil record will need to be re- examined to ensure there is not an underestimation of their biodiversity.
    Źródło:
    Acta Palaeontologica Polonica; 2019, 64, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Westernization of dietary patterns among young Japanese and Polish females – a comparison study
    Autorzy:
    Morinaka, T.
    Wozniewicz, M.
    Jeszka, J.
    Bajerska, J.
    Nowaczyk, P.
    Sone, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/49874.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Medycyny Wsi
    Opis:
    Introduction and objective. Nowadays, the process of the westernization of eating habits is perceived to be one of the main causes of epidemics of civilization diseases, such as metabolic syndrome. The aim of the study was to assess the westernization of eating habits among 100 Japanese (aged 18-23 years) and 111 Polish female students (aged 19-25 years) of nutrition science related faculties. Materials and methods. Food-frequency questionnaires were used to assess a dietary pattern during the four seasons of a one-year investigation. Data obtained in each season was pooled. The frequency of consumption of different foods (servings/week) between the two countries was compared and characterization of the dietary patterns of both studied populations was analyzed by factor analysis. Results. When food consumption between the two countries was compared, apart from total meat and meat products and high-energy drink intake, significant differences were observed in all foods and food groups. Three dietary patterns were identified in both groups. Among Japanese participants, the first pattern was ‘traditional Japanese’, the second ‘sweets and beverages’, and the third ‘Western’, explaining 9.0%, 8.5% and 6.4% of the total variance, respectively. Among Polish participants, the first pattern was ‘prudent’, the second ‘Western’, and the third ‘sweets and alcoholic beverages’, explaining 8.2%, 7.7%, 6.4% of the total variance, respectively. Although the ‘Western’ dietary pattern was found in both groups, there were some differences in the remaining dietary patterns between the two countries. Conclusions. In the Japanese participants, significant cultural influences on habitual food intake could still be observed, and the extent of diet westernization seems to be smaller compared to the Polish participants.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2013, 20, 1
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of slow-release fertilizers of Silvamix and Silvagen line on growth of a young spruce and larch forest plantation three years after application
    Autorzy:
    Stofko, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/38627.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    fertilizer
    Silvamix fertilizer
    Silvagen fertilizer
    plant growth
    young plant
    spruce forest
    larch forest
    forest plantation
    fertilizer application
    Opis:
    This work evaluates effects of tablet fertilizers Silvamix, Silvamix Mg and Silvagen on height and diameter growth of a young plantation of Norway spruce [Picea abies (L.) Karst.] and European larch (Larix decidua Mill.) after the third year of fertilizer application. The experiment was conducted on one experimental plot in the Low Tatra Mountains. The fertilizers were applied at a rate five tablets (50 g) per each tree, considering not treated trees as the control. The tablets were laid on the ground and thoroughly trodden into soil. ANOVA analysis did not reveal any significant effects of fertilizers on height and diameter growth of Norway spruce trees. The use of Silvagen resulted in significant effects on height growth of larch trees.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2010, 52, 1
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Critical swim speed and metabolic activities in trained male and female swimmers after 400 m free style swimming with their full effort
    Autorzy:
    Chatterjee, P.
    Nandy, P.
    Chakraborty, S.
    Bandyopadhyay, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1918384.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Medyczny w Białymstoku
    Tematy:
    Critical swim speed
    creatinine
    young s wimmers
    Opis:
    Purpose: This study was done to ascertain gender dif ferences in trained swimmers between their Critical S wim Speed (CSS). Certain metabolic responses, imme diately after 400 meters free style swimming (FSS), w ith maximum effort, were also studied. Methods: The analysis was conducted in trained swi mmers between 12- 18 years age. Height, weight, bod y fat quantity were estimated using standard techniqu es. CSS was measured for each swimmer. Blood samp les were taken within two minutes of 400 meters FSS, with maximum efforts. The blood creatinine, lactic ac id, serum calcium, serum urea and serum urea nitroge n were estimated using standard laboratory methods. Results: With the maximal effort of 400 meters FSS, values of hematological variables for both sexes were found to increase many folds than reference values. Si gnificant (p<0.05) gender differences were observed in CSS and blood creatinine. The positive significant (p<0.05) correlation was found between CSS and heig ht in the swimmers. For trained male swimmers signif icant positive correlations among CSS, blood urea an d serum urea nitrogen were found. Conclusions: This study reflects metabolic status of b oth trained male and female swimmers, after their full efforts. Besides blood creatinine no significant differe nces were observed in them. So it may conclude that e ffective physical training minimizes the metabolic de mands during their full efforts and gender differences could be overcome.
    Źródło:
    Progress in Health Sciences; 2016, 6(2); 46-50
    2083-1617
    Pojawia się w:
    Progress in Health Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control of Exciton Fine Structure Splitting in Quantum Dots
    Autorzy:
    Stevenson, R. M.
    Young, R. J.
    Atkinson, P.
    Cooper, K.
    Ritchie, D. A.
    Shields, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046985.pdf
    Data publikacji:
    2006-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.67.Mn
    78.67.Hc
    78.55.Cr
    Opis:
    Quantum dots have been identified as potential sources of entangled photon pairs, essential for many applications in quantum information. However, in practice structural properties of the dots result in polarisation splitting of the emission lines, which has prevented the realisation of such a source. Here, we present two techniques developed to control the polarisation splitting in a quantum dot both irreversibly and reversibly. We find that the splitting is strongly dependent upon the emission energy, or lateral confinement, of the quantum dot. Thus by precise control of the InAs deposition thickness, it is possible to produce ensembles from which dots with zero polarisation splitting can be easily selected. Additionally, we demonstrate that by using modest in-plane magnetic fields to partially mix the bright and dark exciton states, the polarisation splitting can be reversibly tuned to zero for most dots of a certain type. Finally, we demonstrate the emission of triggered entangled photon pairs from a quantum dot with approximately zero splitting with fidelity >70%.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 3; 311-318
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Młoda geologia w Polsce : historia i działalność studenckich kół naukowych geologów
    Young geology in Poland : history and recent activity of student research group of geologists
    Autorzy:
    Kowalski, A.
    August, C.
    Jakus, N.
    Ozimkowski, W.
    Paca, P.
    Raczko, J.
    Sauermann, J.
    Senderak, K.
    Urbanek, P.
    Zając, M.
    Zboińska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075529.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    organizacje studenckie
    studenckie koło naukowe
    młoda geologia
    Polska
    student organizations
    student research groups
    young geology
    Polska
    Opis:
    Student scientific organizations and research groups create numerous opportunities for the development of interests and passions related to many fields of science. In case of geological sciences, student research groups are organizations which are conducive to exchanging first scientific ideas between young geologists and experienced researchers. These associations constitute also a generational bridge between students and their teachers. The beginnings of the firstformal organizations of geology students date back to the second halfof the 1940s and 1950s. Due to the nature of geological studies, membership in scientific circles, is associatedfrom the beginning of their activities with many research trips and participation in conferences. This paper aims at presenting the history and contemporary activity of geological student research groups in Poland. We describedfive organizations, whose activities constitute an integral part of geological studies in our country. Authors wish to remind distinguished teachers and members of student research groups, who contributed to their development in a special way.
    Źródło:
    Przegląd Geologiczny; 2016, 64, 9; 766--770
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Young modulus and microhardness anisotropy in (Pb,Cd)Te solid solution crystallizing in the rock salt structure and containing 5% of Cd
    Autorzy:
    Łusakowska, E.
    Adamiak, S.
    Adamski, P.
    Kuna, R.
    Minikayev, R.
    Skupiński, P.
    Szczerbakow, A.
    Szuszkiewicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1055144.pdf
    Data publikacji:
    2017-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.-x
    Opis:
    A single crystal of (Pb,Cd)Te solid solution with Cd content equal to 5% was grown by self-selecting vapour growth technique and characterized by powder X-ray diffraction using the X'Pert PANalytical diffractometer and Cu K_{α₁} radiation. The X-ray diffraction pattern refinement demonstrated the fcc structure of the rock-salt type of investigated sample, no precipitates or other crystal phases were detected. The sample chemical composition was determined on the basis of measured lattice parameter value. Next, the Young modulus and microhardness were determined by the nanoindentation for carefully prepared, (001), (011) and (111)-oriented single crystal plates. The slight anisotropy of two parameters mentioned above has been found and compared with available literature data.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 2; 343-346
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evidence of two lineages of metriorhynchid crocodylomorphs in the Lower Cretaceous of the Czech Republic
    Autorzy:
    Madzia, D.
    Sachs, S.
    Young, M.T.
    Lukeneder, A.
    Skupien, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082332.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Crocodylomorpha
    Thalattosuchia
    Metriorhynchidae
    Lower Cretaceous
    Valanginian
    Czech Republic
    Opis:
    Metriorhynchid crocodylomorphs were an important component in shallow marine ecosystems during the Middle Jurassic to Early Cretaceous in the European archipelago. While metriorhynchids are well known from western European countries, their central and eastern European record is poor and usually limited to isolated or fragmentary specimens which often hinders a precise taxonomic assignment. However, isolated elements such as tooth crowns, have been found to provide informative taxonomic identifications. Here we describe two isolated metriorhynchid tooth crowns from the upper Valanginian (Lower Cretaceous) of the Štramberk area, Czech Republic. Our assessment of the specimens, including multivariate analysis of dental measurements and surface enamel structures, indicates that the crowns belong to two distinct geosaurin taxa (Plesiosuchina? indet. and Torvoneustes? sp.) with different feeding adaptations. The specimens represent the first evidence of Metriorhynchidae from the Czech Republic and some of the youngest metriorhynchid specimens worldwide.
    Źródło:
    Acta Palaeontologica Polonica; 2021, 66, 2; 357-367
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Reducing Temperature on Changing Young’s Modulus and the Coefficient of Friction of Selected Sliding Polymers
    Wpływ obniżania temperatury na zmianę modułu Younga oraz współczynnika tarcia wybranych materiałów polimerowych
    Autorzy:
    Ptak, A.
    Kowalewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/188137.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    polymers
    Young's modulus
    friction coefficient
    low temperature
    tribology
    polimery
    moduł Younga
    współczynnik tarcia
    niska temperatura
    tribologia
    Opis:
    For the polymeric materials, changing of the temperature causes changes in mechanical and tribological properties of sliding pairs. The goal of the present study was to determine the change in Young's modulus and kinetic friction coefficient depending of the temperature. Three thermoplastic polymers, PA6, PET and PEEK, were tested. These materials cooperated in sliding motion with a C45 construction steel disc. As part of the experiment, the Young's modulus tests (by 3-point bending method) and kinetic friction coefficient studies (using pin-on-disc stand) were carried out. The temperature range of mechanical and tribological tests was determined at T = –50°C±20°C. Comparing the results of mechanical and tribological properties, there is a tendency to decrease the coefficient of friction as the Young's modulus increases while reducing the working temperature.
    Zmiany temperatury w przypadku materiałów polimerowych są przyczyną zmian własności materiału, a co za tym idzie i właściwości tribologicznych par ślizgowych. Tematem podjętym w niniejszym artykule jest określenie zmiany modułu Younga oraz współczynnika tarcia kinetycznego materiałów polimerowych współpracujących ślizgowo ze stalą w zależności od temperatury. Do badań wykorzystano polimery termoplastyczne: PA6, PET oraz PEEK, które współpracowały ślizgowo ze stalą konstrukcyjną C45. W ramach eksperymentu zostały przeprowadzone badania modułu Younga (3-punktową metodą zginania) oraz badania współczynnika tarcia kinetycznego (wykorzystując stanowisko typu pin-on-disc). Zakres temperatury badań mechanicznych i tribologicznych określony został na poziomie T = –50°C±20°C. Porównując wyniki badań własności mechanicznych z właściwościami tribologicznymi, można zauważyć tendencję do zmniejszenia wartości współczynnika tarcia wraz ze wzrostem modułu Younga podczas obniżania temperatury otoczenia.
    Źródło:
    Tribologia; 2018, 279, 3; 107-111
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Family with Li-Fraumeni syndrome and no evidence of a germline mutation of the p53 gene or chromosomal aberrations
    Autorzy:
    Sikorska, A
    Traczyk, Z.
    Konopka, L.
    Fiszer-Maliszewska, L.
    Wojciechowska, B.
    Pienkowska-Grela, B.
    Rygier, J.
    Woroniecka, R.
    Witkowska, A.
    Rusin, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041808.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    germline mutation
    Li-Fraumeni syndrome
    brain tumour
    carcinoma
    child
    chromosome aberration
    cancer
    p53 gene
    young adult
    Źródło:
    Journal of Applied Genetics; 2001, 42, 3; 379-384
    1234-1983
    Pojawia się w:
    Journal of Applied Genetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical properties of Si3N4 – graphene composites sintered by SPS method
    Autorzy:
    Klimczyk, P.
    Jaworska, L.
    Cygan, S.
    Morgiel, J.
    Major, Ł.
    Olszyna, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/391862.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    silicon nitride
    graphene
    Young's modulus
    hardness
    friction coefficient
    wear rate
    Opis:
    Silicon nitride powder with a small addition of magnesium oxide and yttria stabilized tetragonal zirconia fine particles was used as a starting material. Multilayer graphene nanoplatelets were used as filler for silicon nitride based composites. Graphene content in the mixtures was 0‒2 wt. %. The composites were obtained by the Spark Plasma Sintering method at 1650°C under 35 MPa of uniaxial pressure. Separation of the agglomerated graphene platelets in the matrix was observed for these materials. Insufficient dispersity of graphene slightly decreased the mechanical properties of Si3N4 ceramics. The SEM and TEM microstructural analysis of sintered materials show that the applied pressure during the sintering process leads to the orientation of the graphene phase and in consequence causes anisotropy of properties. The differences of friction coefficients were examined with the Ball-on-Disc method for the two directions (parallel and perpendicular to the pressing axis). Also the specific wear rate of the ball for the direction parallel to pressing axis differ significantly in comparison to the wear for the direction perpendicular to the pressing direction.
    Źródło:
    Prace Instytutu Odlewnictwa; 2017, 57, 4; 235-239
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Giant Young’S Modulus Variations in Ultrafine-Grained Copper Caused by Texture Changes at Post-Spd Heat Treatment
    Gigantyczne zmiany modułu Younga w ultra drobnoziarnistej miedzi spowodowane przez zmiany tekstury w trakcie obróbki cieplnej po SPD
    Autorzy:
    Pal-Val, P.
    Pal-Val, L.
    Natsik, V.
    Davydenko, A.
    Rybalko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/353526.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    elastic properties
    Young's modulus
    severe plastic deformation
    crystallographic texture
    właściwości plastyczne
    moduł Younga
    silne odkształcenie plastyczne
    tekstura krystalograficzna
    Opis:
    The effect of annealing on dynamic Young’s modulus, E, of ultrafine-grained (UFG) copper obtained by combined severe plastic deformation (SPD) is investigated. It is established that Young’s modulus in the SPD-prepared samples exceeds that in the coarse-grained fully annealed (CGFA) samples by 10 to 20 %. Isothermal annealing at elevated temperatures between 90 and 630°С leads to a sharp decrease of Young’s modulus for annealing temperatures above 210°С. After annealing at 410°С, the value of E reaches its minimal value that is 35 % lower than E in CGFA samples (total change in E is about 47 % of the initial value). Further annealing at higher temperatures leads to an increase in Young’s modulus. It is shown, that the unusual behavior of Young’s modulus is caused by formation of the <111> axial texture in the SPD-treated samples which then is replaced by the <001> texture during the post-SPD heat treatment.
    Zbadano wpływ wyżarzania na dynamiczny moduł Younga (E), w ultra drobnoziarnistej miedzi (UFG) otrzymanej przez złożone intensywne odkształcenie plastyczne (SPD). Stwierdzono, że wartość modułu Younga próbek przygotowanych przez SPD przekracza tą w gruboziarnistych w pełni wyżarzonych próbkach (CGFA) o 10 do 20%. Izotermiczne wyżarzanie w podwyższonej temperaturze pomiędzy 90 i 630°С prowadzi do gwałtownego spadku modułu Younga dla temperatury wyżarzania powyżej 210°С. Po wyżarzaniu w 410°C, E osiąga minimalną wartość, która jest o 35% niższa niż wartość E w próbkach CGFA (całkowita zmiana E wynosi około 47% wartości początkowej). Dalsze wyżarzanie w wyższych temperaturach prowadzi do zwiększenia modułu Younga. Pokazano, że to niezwykłe zachowanie modułu Younga jest spowodowane tworzeniem osiowej tekstury <111> w próbkach poddanych SPD, która następnie zastępowana jest teksturą <001> podczas obróbki cieplnej po SPD.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 4; 3073-3076
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oszacowanie zawartosci skladnikow mineralnych w racjach pokarmowych mlodziezy szkolnej
    Autorzy:
    Przysiezna, E
    Klisz, P.
    Orkusz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/826797.pdf
    Data publikacji:
    2002
    Wydawca:
    Polskie Towarzystwo Technologów Żywności
    Tematy:
    uczniowie
    ludzie mlodzi
    oznaczanie
    skladniki mineralne
    calodzienne racje pokarmowe
    zywienie czlowieka
    student
    young people
    determination
    mineral component
    daily food ration
    human nutrition
    Opis:
    Oszacowano zawartość składników mineralnych w całodziennych racjach pokarmowych (CRP) wybranych stołówek przy i internatach we Wrocławiu i porównano z normami żywieniowymi. Analizowane CRP pokrywały zapotrzebowanie młodzieży szkół średnich na Mo. W nadmiarze pokrywały zapotrzebowanie na Na, K, Cl, P, Fe, Mn, Mg, Zn, Cu, a nie pokrywały zapotrzebowania na Ca, I, F, Se, Cr. Zawartość S w analizowanych CRP wynosiła 372 - 643 mg, a Co 18 - 46 µg.
    The aim of this study was to estimate the content of mineral components in daily food rations from selected canteens at the dormitories in Wrocław and comparison to daily requirements. It was demonstrated that the studied food rations were covering requirements for secondary school children in the case of Mo, were covering requirement with excess of Na, K, Cl, P, Fe, Mn, Mg, Zn, Cu and failed to confirm the daily requirements for Ca, I, F, Se, Cr. Contents of S was 372 - 643 mg and of Co was 18 - 46 µg.
    Źródło:
    Żywność Nauka Technologia Jakość; 2002, 09, 1; 132-140
    1425-6959
    Pojawia się w:
    Żywność Nauka Technologia Jakość
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of AlgaminoPlant and route on rhizogenesis of stem cuttings of Cotinus coggygria “Royal Purple” and “Young Lady”
    Autorzy:
    Petelewicz, P.
    Pacholczak, A.
    Szydlo, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/80277.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    rhizogenesis
    stem cutting
    rooting
    Cotinus coggygria
    biopreparation
    AlgaminoPlant biopreparation
    Route biopreparation
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Emigration to the Kingdom of the Netherlands as a perceived opportunity by young people
    Emigracja do Królestwa Niderlandów jako szansa postrzegana przez młodych ludzi
    Autorzy:
    Siedlanowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048669.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
    Tematy:
    youth migrations
    reasons for emigration
    labor market
    Polska
    Kingdom of the Netherlands
    Opis:
    Subject and purpose of work: The article is devoted to factors influencing the migration decisions of young Poles to the Kingdom of the Netherlands, and to showing the differences in their perception of the country of emigration and the country of immigration. The elements of youth policy in Poland and the Netherlands were also presented. The hypothesis adopted in the paper was that the decisions of young people in the labor market are mainly influenced by short-term financial aspects. Materials and methods: The observations and assessments used in the article were formulated based on the research literature on the subject, the statistical data collected by the institutions of Poland, the Kingdom of the Netherlands and the European Union, a questionnaire survey and own experiences gained from mobility. Results: The article outlines the course of migration trends of Poles and presents the causes of changes in the choice of the destination country for migration. It presents factors encouraging young people to take up employment in the country and those encouraging them to search a job abroad, specifically in the Netherlands. The barriers and facilities that may be encountered by young people seeking employment in the labor market in both countries were indicated. The reasons for the emigration of young people from Poland were discussed based on the results of the current study, that is a 400-person research sample obtained from an online survey. The aim of the study was to identify three important factors influencing the decision to emigrate and to evaluate this decision. Conclusions: The conducted analysis shows the complexity of the problems of migration of young people. Economic, political, social, cultural, and environmental factors have a significant influence on the decisions made. From the point of view of young people, the unattractive domestic labor market in terms of finance and development, and all the resulting consequences are the biggest problems.
    Źródło:
    Economic and Regional Studies; 2021, 14, 2; 220-238
    2083-3725
    2451-182X
    Pojawia się w:
    Economic and Regional Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model klasyfikacyjny prognozowania wystąpienia masowych szkód w uprawach leśnych od pędraków chrabąszczy (Melolontha Fabr.)
    Classification model for prediction of mass damage in young forest plantations caused by larvae of cockchafer (Melolontha Fabr.)
    Autorzy:
    Drozdowski, S.
    Jankowski, P.
    Byk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/993325.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    ochrona lasu
    uprawy lesne
    szkodniki roslin
    chrabaszcz
    Melolontha
    pedraki
    szkody w lesie
    prognozowanie
    modele klasyfikacyjne
    melolontha
    logistic regression
    root pests
    young forest plantations
    Opis:
    Study presents a classification model for predicting the occurrence of mass damage in young forest plantations caused by insect pests on roots belonging to Melolontha genus. Logistic regression model was built on the basis of 10 taxation features describing 177 young stands. Habitat fertility, occurrence of Scots pine and European beech, and weed infestation of the habitat are the most significant features that influence mass occurrence of cockchafer larvae acting as insect pests on roots in plantations.
    Źródło:
    Sylwan; 2013, 157, 09; 678-685
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ zmęczenia specyficznym wysiłkiem fizycznym na przejawianie siły i dokładności siłowej polskich tenisistów w młodszych kategoriach wiekowych
    Influence of a specific effort on the level of the strength and strenght accuracy amongst young tennis players
    Autorzy:
    Zurek, P.
    Rynkiewicz, M.
    Rynkiewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/12783.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Szczeciński
    Źródło:
    Aktywność Ruchowa Ludzi w Różnym Wieku; 2014, 3[23]
    2299-744X
    Pojawia się w:
    Aktywność Ruchowa Ludzi w Różnym Wieku
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza realizacji programu "Młody rolnik" na terenie województwa lubelskiego w latach 2007-2016
    Analysis of the implementation of the program "Young Farmer" in the Lubelskie Voivodeship in the years of 2007-2016
    Autorzy:
    Patkowski, K.
    Leszczynska, D.
    Szymanowska, A.
    Zarajczyk, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/862634.pdf
    Data publikacji:
    2017
    Wydawca:
    The Polish Association of Agricultural and Agribusiness Economists
    Opis:
    Celem badań było przedstawienie realizacji programu „Ułatwienie startu młodym rolnikom” w ramach PROW w latach 2007-2013 oraz stanu realizacji programu „Premie dla młodych rolników” w latach 2014-2016 na terenie województwa lubelskiego w ramach PROW 2014-2020. Materiał badawczy stanowiły dane udostępnione przez Lubelski Oddział Regionalny ARiMR z siedzibą w Elizówce. W województwie lubelskim w latach 2007-2016 złożono 6849 wniosków, co stanowiło 12% wszystkich złożonych deklaracji o przyznanie pomocy w Polsce i podpisano 5371 umów. Najwięcej wniosków o wsparcie złożono w powiecie bialskim – 1128. Powiat lubelski z wynikiem 665 znalazł się na drugim miejscu pod względem liczby złożonych wniosków. Kolejne miejsca zajmowały powiaty radzyński, parczewski, chełmski i hrubieszowski. Średni wiek beneficjentów mieścił się w przedziale od 21 lat w powiecie radzyńskim do 26 w powiecie tomaszowskim. Nowy nabór charakteryzował się wyższym wiekiem beneficjentów składających wnioski, zarówno na poziomie województw, jak i na poziomie powiatów. W województwie lubelskim średnia powierzchnia przejmowanego gospodarstwa w latach 2007-2013 wynosiła 13,8 ha. Na poziomie województwa lubelskiego największe gospodarstwa utworzono w powiatach parczewskim i chełmskim. Większość beneficjentów składających wnioski w obu edycjach programu miało wykształcenie średnie. W latach 2007-2016 uprawy polowe oraz produkcja mieszana stanowiły główne kierunki produkcji w większości gospodarstw.
    The aim of the research is to present the implementation of the program Facilitating the start of young farmers under the Rural Development Program in 2007-2013 and the state of implementation of the program Bonuses for young farmers in the years of 2014-2016 in the Lublin voivodeship as part of RDP 2014-2020. The research material were data provided by the Lubelski Regional Branch of the Agency for Restructuring and Modernization of Agriculture (ARiMR) based in Elizówka, Lublin. In the Lubelskie Voivodeship, 6849 applications were submitted, which constituted 12% of all applications for support submitted, and 5371 contracts were signed. The largest number of applications for support was submitted in the Bialski poviat – 1128. The Lublin poviat, with the result of 665, ranked second in terms of the submitted applications. The following places were taken by the poviats of Radzyń, Parczew, Chełm, and Hrubieszów. The average age of beneficiaries ranged from 21 in the Radzyń poviat to 26 in the Tomaszów poviat. The new recruitment was characterized by a higher age of beneficiaries submitting applications, both at the level of voivodeships and at the level of poviats. In 2007-2013 in the Lubelskie Voivodeship, the average area of the farm taken over was 13.8 ha. At the level of the Lubelskie Voivodeship, the largest farms were established in the poviats of Parczew and Chełm. The majority of beneficiaries submitting applications in the Lubelskie Voivodeship in both editions of the program had secondary education.In the years of 2007-2016, field crops and mixed production were the main types of production in most farms.
    Źródło:
    Roczniki Naukowe Stowarzyszenia Ekonomistów Rolnictwa i Agrobiznesu; 2017, 19, 6
    1508-3535
    2450-7296
    Pojawia się w:
    Roczniki Naukowe Stowarzyszenia Ekonomistów Rolnictwa i Agrobiznesu
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The impact of postglacial palaeoenvironmental changes on the properties of sediments in the kettle hole at Jurki (NE Poland)
    Autorzy:
    Karasiewicz, T. M.
    Hulisz, P.
    Noryśkiewicz, A. M.
    Stachowicz-Rybka, R.
    Michalski, A.
    Dąbrowski, M.
    Gamrat, W. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060388.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    young glacial landscape
    kettle hole
    end moraines
    geochemical analysis
    biogenic deposits
    Opis:
    This research is focused on a small kettle hole located within the Morąg moraines (Iława Lake District, NE Poland). The study objective was to determine the impact of palaeoenvironmental changes in sedimentation and properties of sediments filling the bottom of the kettle hole. Sedimentological, geochemical, and palaeobotanical studies enabled us to distinguish several development phases of the kettle hole, and cluster analysis performed on physicochemical data yielded seven local geochemical zones (JuI/I to JuI/VII). The beginning of biogenic sedimentation in the conditions of a small water body, functioning in the Late Glacial period (4.20–4.10 m), was determined on the basis of palaeobotanical research. Sediments deposited in the lake during its further evolution were rich in microelements such as Ca, Na, Mg, and K, and to a smaller extent – Fe and Mn (JuI/I–III local geochemical zones). The Late Glacial lacustrine period ended with the accumulation of very silty, pollen-free gyttja, with a stratigraphic hiatus (JuI/IV, 3.40–3.20 m). The sediments were enriched with SiO2ter, which indicates an increased rate of slope erosion, and concretions of Fe-Mn occurring below this layer (JuIII) provide evidence for lowering of the water level and even desiccation. In the Holocene, the lacustrine period ended with the accumulation of coarse detrital gyttja (3.20–2.60 m). Palaeobotanical data indicate that the next group of sediments were deposited in the Late Subboreal and Subatlantic periods (2.60–0.0 cm, JuI/V–VII; sedge peat). Their properties were varied and related to hydrologic conditions, limited denudation, and vegetation succession. There was also a significant change in the trophic conditions of the water and consequently in the sediments of the kettle hole, which changed during the lacustrine period from basic to acid, and strongly acid in the surface layer. This reaction may be related to a change in the water regime as well as to human impact in the environment, which led to the colonization of the peat bog by Sphagnum moss.
    Źródło:
    Geological Quarterly; 2017, 61, 2; 319--333
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Foot mechanics in young women are altered after walking in high-heeled shoes
    Autorzy:
    Winiarski, S.
    Rutkowska-Kucharska, A.
    Zostawa, P.
    Uścinowicz-Zostawa, N.
    Klich, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/307334.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    analiza chodu
    reakcja podłoża
    stopa
    gait analysis
    high-heeled shoes
    ground reaction forces
    foot rockers
    foot deformities
    Opis:
    Nowadays, fashion has caused that many young women are wearing high-heeled shoes. Therefore, the aim of this study was to examine the effects of long-term walking in high-heeled shoes on the foot mechanics during barefoot gait. Methods: Forty-three young women (22 ± 2.1 years) divided into two groups participated in this retrospective cohort study. The first group was composed of women who frequently wear high-heeled footwear. The second, infrequent wearers group, consisted of women who preferred flat-heeled shoes. Measurements of gait parameters were recorded for barefoot gait. A motion analysis system and two force plates were used in order to evaluate the lower-limb rocker mechanism, transverse foot arch height and parameters of ground reaction force. Results: Walking in high-heeled shoes modified barefoot foot mechanics, which manifested itself in a shorter duration (by ca. 4%) of the first and second rocker and a significantly longer duration (by 5%) of the third rocker phase as well as a substantial reduction in height of the transverse foot arch (by around 50%) in women habitually walking in high-heeled shoes. A significantly shorter relative duration of the third rocker (44.3% of cycle time) and greater value of the vertical component of ground reaction force (114.7% BW) in the third rocker phase were found in the group of women habitually walking in high-heeled shoes. Conclusions: The mechanism of foot rolling, with flattened foot arch, and significantly higher values of the vertical component of ground reaction force and shorter time might lead to overload in lowerlimb joints in young women.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 3; 107-113
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generalized Oberst beam method for measuring viscoelastic parameters of layered composite components
    Autorzy:
    Dobrucki, A.
    Bolejko, R.
    Nieradka, P.
    Klimek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/38695915.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    viscoelastic material
    composites
    Young modulus
    loss factor
    beam resonance
    Oberst beam method
    Opis:
    This paper proposes two new methods of measuring the viscoelastic parameters of materials. The methods are based on the composite beams’ resonant frequencies measurement. The Young moduli and loss factors of the components are determined by measuring the frequency response of a composite beam twice, each time with different layer thickness ratios. A system of two equations is obtained, from which Young’s moduli of the composite components are calculated. Similarly, two obtained equations determine the loss factors. The results obtained by the proposed methods are compared with those obtained by standard methods and then validated by experiments and FEM simulations. It was noted that the developed models, as well as the standard ones, are highly sensitive to the precision of the samples (material trimming and the way of joining the composite elements). The proposed methods prove to have an advantage over the standard ones in the matter of more frequent measurement criterion fulfilment. The acknowledged criterion represents the existence of a sensible solution insensitive to measurement errors. This criterion, which assures that the results are not prone to errors (for example negative loss factors) is met in 100% of cases in one of the methods, compared to 65% for standard methods.
    Źródło:
    Archives of Mechanics; 2023, 75, 1-2; 27-52
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical characterization of millimetric agarose spheres using a resonant technique
    Autorzy:
    Yescas, J.
    Mandal, P.
    Sinha, J.
    Snook, R.
    Hawkes, J.
    Moreno Garibaldi, P.
    Carrera-Espinoza, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/38597605.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    agarose spheres
    resonance experiment
    bulk mechanical properties
    tissue engineering
    Young's modulus
    3D scaffolds
    Opis:
    This paper presents a methodology for the mechanical characterization of agarose millimetric spheres using resonant principles. Detection of the modes of vibration was conducted using a low-cost experimental setup based on an electret microphone adapted with a thin latex elastic membrane for the sensing stage and a piezoelectric actuator driven by a conventional transformer for the excitation stage. The identification of vibration modes is supported through an ANSYS Finite Element model of the experimental setup. Experimental and numerical results demonstrate that two modes of vibration, known as Quadrupole and Octupole, appear in the amplitude spectrum and can be used to obtain stiffness values for the samples. Following this approach, Young’s modulus of 209 ± 19.80, 338 ± 35.30 and 646 ± 109 kPa for 2%, 3% and 4% agarose millimetric spheres were calculated.
    Źródło:
    Archives of Mechanics; 2020, 72, 3; 217-233
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wstępna ocena przydatności nowego preparatu mocznikowo-mineralnego w żywieniu młodego bydła opasowego
    Predvaritel'naja ocenka prigodnosti novogo mochevino-mineral'nogo preparata v kormlenii molodogo otkormochnogo skota
    Preliminary estimation of a new urea-mineral preparation in feeding young fattening cattle
    Autorzy:
    Karas, J.
    Swietlikowski, P.
    Krasnodebski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/796374.pdf
    Data publikacji:
    1988
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Opis:
    Новый мочевино-минеральный препарат производится, в первую очередь, из отечественных сырвевых материалов, т.е. из доломитов (карбонат кальция и магния) и фосфорной кислоты производимой из апатитов, с прибавкой некоторых минеральных элементов и мочевины. Этот препарат содержит м.пр. свыше 55% мочевины, 4% Р, 3,5% Са и 3,7% Na. Испытания препарата проводились в 1983 г. на 48 бычках низинной черно-пестрой породы, разделенных на 3 группы по 16 животных в группе. Животных кормили индивидуально. На основании полученных результатов испытаний можно формулировать следующие заключения: - применение нового мочевино-минерального препарата дало результаты продукции сходные с препаратом „Валчан”, - использование азота мочевины из нового препарата не было лучше, чем препарата „Валчан” и кристаллической мочевины, - новый мочевино-минеральный препарат характеризуется тем преимуществом, что может изготовляться почти исключительно из отчечественных сырьевых материалов. Однако, следует проводить дальнейшие испытания по кормлению, которые бы позволили получить более подробную информацию касающуюся качества указанного препарата.
    New urea-mineral preparation is produced, first of all, from home raw materials, i.e. from dolomites (calcium and magnesium carbonate) and phosphoric acid produced from apatites, with addizion of some mineral elements and urea. This preparation containing, among other things, over 55% of urea, 4% of P, 3.5% of Ca and 3.7% of Na. The preparation was tested in 1983 on 48 young bulls of the lowland black-and-white breed divided into 3 groups, by 16 animals in each group. Animals were fed individually. On the basis of results obtained in the tests the following conclusions can be drawn: - application of the new urea-mineral preparation gave similar productive results as application of the „Wałczan” preparation, - utilization of N-urea from the new preparation was not better than that of „Wałczan” and crystalline urea, - the advantage of the new urea-mineral preparation is that it can be produced almost exclusively from home raw materials. However, further feeding experiments, which would enable to get more detailed information about the value of this preparation, should be carried out.
    Źródło:
    Zeszyty Problemowe Postępów Nauk Rolniczych; 1988, 361
    0084-5477
    Pojawia się w:
    Zeszyty Problemowe Postępów Nauk Rolniczych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rola ojcowskich oddziaływań w rozwoju małego dziecka. Perspektywa rozwojowego zysku
    The role of father’s influence in the development of a young child. Developmental profit perspective
    Autorzy:
    Ratajczak, Łukasz P.
    Powiązania:
    https://bibliotekanauki.pl/articles/43665810.pdf
    Data publikacji:
    2021-11-04
    Wydawca:
    Akademia Pedagogiki Specjalnej im. Marii Grzegorzewskiej. Wydawnictwo APS
    Tematy:
    ojciec
    nowe ojcostwo
    rola ojca
    rozwój
    małe dziecko
    ojcostwo zaangażowane
    father
    new fatherhood
    father’s role
    development
    young child
    committed fatherhood
    Opis:
    Rozważania podjęte w tym artykule, uwzględniające szeroko rozumianą problematykę ojcostwa, służą ukazaniu znaczenia ojcowskich oddziaływań w rozwoju małego dziecka. Towarzyszy im bowiem założenie, zgodnie z którym ojcostwo realizowane w sposób zaangażowany (a takie jest nowe ojcostwo) z wielu względów jest korzystne, przede wszystkim dla dziecka, w każdym wieku, w tym szczególnie w okresie wczesnego dzieciństwa (ze względu na intensywność i zakres zachodzących zmian rozwojowych).
    The considerations undertaken in this article, taking into account the broadly understood issues of fatherhood, serve to show the importance of father's influence in the development of a small child. They are accompanied by the assumption that engaged fatherhood (and this is the new fatherhood) is for many reasons beneficial, above all for a child, at any age, especially in early childhood (due to the intensity and scope of the ongoing developmental changes).
    Źródło:
    Problemy Opiekuńczo-Wychowawcze; 2021, 603(8); 66-76
    0552-2188
    Pojawia się w:
    Problemy Opiekuńczo-Wychowawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tektoniczne struktury deformacyjne w iłach krakowieckich sarmatu w Wylewie k. Sieniawy (zapadlisko przedkarpackie): świadectwo młodej przesuwczej aktywności podłoża miocenu
    Tectonic deformation structures in the Sarmatian (Miocene) Krakowiec clays atWylewa near Sieniawa (Carpathian foreland basin): a record of young strike-slip fault activity in the basement
    Autorzy:
    Nescieruk, P.
    Wójcik, A.
    Malata, A.
    Aleksandrowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074521.pdf
    Data publikacji:
    2007
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    południowo-wschodnia Polska
    zagłębie Karpackie
    miocen
    sarmat
    tektoniczny uskok wzdłużny
    fałdy
    uskoki
    cios
    southeast Poland
    Carpathian foreland basin
    Miocene
    Sarmatian
    strike-slip tectonics
    folds
    faults
    joints
    Opis:
    Tectonic deformation structures (folds, strike-slip, reverse and normal faults as well as joints) are reported here from the topmost part of the youngest, clayey sediments of the Carpathian foreland basin (Krakowiec clays, Sarmatian, Miocene), in a clay pit located at a village ofWylewa near Sieniawa. Our structural study has revealed several joint sets, accompanying products of intense folding and faulting, and defining a structural pattern that can be easily interpreted in terms of structures formed in a transpressive regime above strike-slip faults in the basement. The origin of these structures is ascribed to tectonic activity of the NW-SE-trending Ryszkowa Wola horst known to occur directly beneath the Wylewa clay pit, at a depth of c. 500 to 1300 m and to involve the basement and the lower part of theMiocene succession. The structural pattern in question most likely reflects a sinistral strike-slip displacement on sub-vertical boundary faults of the lowermost part of the horst. Undisputable effects of this strike-slip motion have been recently documented by other authors using 3D seismic data. The deformation structures at Wylewa must have resulted from a young, late to post-Sarmatian tectonic activity in the basement of the Carpathian foreland basin, probably reflecting an E-W to ENE-WSW directed regional shortening episode.
    Źródło:
    Przegląd Geologiczny; 2007, 55, 8; 690-698
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hearing Status in Young People Using Portable Audio Players
    Autorzy:
    Pawlaczyk-Łuszczyńska, M.
    Zaborowski, K.
    Zamojska-Daniszewska, M.
    Rutkowska-Kaczmarek, P.
    Dudarewicz, A.
    Śliwinska-Kowalska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/176501.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    portable audio players
    PAPs
    pure-tone audiometry
    transient-evoked otoacoustic emissions
    TEOAEs
    hearing threshold levels
    high-frequency notches
    noise-induced hearing loss
    Opis:
    The aim of this study was to evaluate the hearing status in young adults using portable audio players (PAPs) in relation to their listening habits. The study included 58 subjects, aged 22.8±2.8 years, non-occupationally exposed to noise. Questionnaire inquiry aimed at collecting personal data, the information on PAPs usage habits, self-assessment of hearing status and identification of risk factors for noise-induced hearing loss (NIHL) were performed in study subjects. Hearing tests included pure-tone audiometry (PTA) and transient-evoked optoacoustic emission (TEOAE). All subjects were PAPs users. Depending on listening habits they were divided into the subgroups of “frequent” users (>1 h/day) and “non-frequent” users (≤1 h/day). There were no significant differences between subgroups in prevalence of NIHL risk factors and self-assessment of hearing status. However, frequent users more often complained of tinnitus and hyperacusis. Majority (81.9 %) of participants had normal hearing. Nevertheless, 6.9 % of audiograms showed high-frequency notches typical for NIHL. Both, the PTA and TEOAE indicated worse hearing in non-frequent users compared to frequent users. No significant differences in prevalence of high-frequency notches between subgroups were noted. The outcomes do not support some previous studies results that the excessive exposure to music listened through PAPs might result in accelerating of development of NIHL loss in young adults.
    Źródło:
    Archives of Acoustics; 2017, 42, 1; 113-120
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of selenium and vitamin E supplementation on erythropoiesis in young goats
    Autorzy:
    Snarska, A.
    Illek, J.
    Snarska, H.
    Grzybowska, D.
    Sobiech, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/53853393.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Opis:
    Selenium is one of the most commonly supplemented microelements in ruminants because deficiency of this trace element is a global problem that can lead to several diseases, especially in young animals during the neonatal period. The aim of this study was to assess the activity of the hematopoietic process based on cytological evaluation of caprine bone marrow smears in goats supplemented with selenium and vitamin E during the neonatal period. Twelve clinically healthy goats at the age of 2 days participated in the study. They were divided into two equal groups (n=6). The goats from the experimental group received a single dose of Se and vitamin E on the second day of life. Bone marrow was collected 2 times, stained with the MGG method, and subjected to cytological evaluation. Peripheral blood was sampled 3 times and peripheral blood smears were analyzed. The bone marrow cells in the group receiving the supplement absorbed dyes faster and more intensively than the same cells in the control animals. The number of erythroblasts was higher in goats from the experimental group than in the control group, which indicated the intensification of erythropoiesis in animals supplemented with selenium and vitamin E. The results of morphological tests clearly indicated an increase in the number of erythrocytes and a higher hemoglobin concentration in the group receiving selenium and vitamin E. Selenium and vitamin E supplementation has a positive impact on the erythropoiesis in bone marrow and can prevent neonatal anemia in goats.
    Źródło:
    Journal of Elementology; 2023, 28, 2; 393-404
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Response of young fig (Ficus carica cv. Sarılop) trees to different irrigation levels in a semi-arid mediterranean environment
    Autorzy:
    Akçay, S.
    Doğan, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/53834138.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Opis:
    Drought scenarios that will be faced in the near future in the Mediterranean Basin will affect sustainable crop production in the region. Even the drought tolerant crops under rain-fed conditions will need supplemental irrigation. The fig tree originates from this region and is grown under semi-arid conditions as a drought-prone crop. The aim of this research is to develop irrigation strategies under various irrigation levels in young fig trees. Five irrigation levels were investigated, covering the rainfed treatment (S0), as well as the fully irrigated treatment S4 (100%) and the S1 (25%), S2 (50%) and S3 (75%) treatments of the full irrigation level. The vegetative growth parameters including plant height, stem diameter, shoot length and number of leaves were evaluated in a two-year field experiment. Additionally, stem water potential (SWP), leaf area index (LAI) and proline content (PC) were also measured. The average seasonal water use values (ET) of young trees ranged from 25.5 to 472.2 mm. Plant vegetative growth parameters were significantly affected by irrigation levels and higher growth was observed in the S3 (75%) and S4 (100%) treatments. Plant physiological responses to different irrigation levels have a significant impact on SWP, LAI and PC measurements. In conclusion, S3 treatment (75% irrigation level) appears to be a good alternative to fully irrigated treatment for growing young fig trees under water-scarce conditions in western Turkey. SWP could be used as a tool in irrigation scheduling of young fig trees. Mean SWP values between -0.82 and -0.86 MPa can be accepted as threshold value for semi-arid regions.
    Źródło:
    Journal of Elementology; 2023, 28, 3; 831-854
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ modyfikacji radiacyjnej i termicznej na właściwości funkcjonalne polietylenu
    The influence of radiation and thermal modification on the functional properties of GUR 1050 polyethylene
    Autorzy:
    Maszybrocka, J.
    Cybo, J.
    Barylski, A.
    Czaja, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/189949.pdf
    Data publikacji:
    2012
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    polietylen UHMW
    modyfikacja radiacyjna
    obróbka termiczna
    twardość
    moduł sprężystości
    zużycie liniowe
    UHMW polyethylene
    radiation modification
    thermal treatment
    Young's modulus
    hardness
    linear wear
    Opis:
    W pracy przedstawiono metodę poprawy trwałości eksploatacyjnej UHMWPE przy jednoczesnym zapewnieniu wysokiej odporności oksydacyjnej polimeru. Materiał wyjściowy GUR 1050 (Poli Hi Solidur Medi TECH) został poddany sekwencyjnemu procesowi, który składał się z etapu modyfikacji radiacyjnej oraz obróbki termicznej. Ocenę skuteczności zastosowanej metody przeprowadzono za pomocą badań mikromechanicznych oraz testów tribologicznych na testerze T-01 (polimer/stop Vitalium). Stwierdzono nieznaczne zmniejszenie się charakterystyk mikromechanicznych (twardość i moduł Younga) wariantów poddanych sekwencyjnemu procesowi modyfikacji w stosunku do tylko napromieniowanych. Wyniki testów tribologicznych wykazują jednak wzrost odporności na zużycie w porównaniu z materiałem niemodyfikowanym i jej niezmienioną wartość w stosunku do polimeru napromieniowanego.
    This paper presents a method of improving the operational durability of UHMWPE, while ensuring high oxidation resistance of the polymer. The initial material, GUR 1050 (Poly Hi Solidur Medi TECH), underwent a sequential process consisting of a stage of modification through radiation, and a stage of thermal processing. The assessment of the effectiveness of the applied method was performed using micromechanical examination and tribological tests using a T-01 (polymer/Vitalium alloy) tester. It was found that there was a slight decrease in the micromechanical characteristics (hardness and Young's modulus) for the variants subjected to the sequential modification process compared to the variants only irradiated. However, the tribological test results show an increase in resistance to wear compared to unmodified material, and unchanged resistance to wear compared to the irradiated polymer.
    Źródło:
    Tribologia; 2012, 4; 167-173
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania biomateriałów metalowych do komputerowego wspomagania projektowania i wytwarzania stałych konstrukcji protetycznych
    Tests metallic biomaterials for computer-aided design and manufacturing of fixed prosthetic restorations
    Autorzy:
    Ryniewicz, A.
    Bojko, Ł.
    Ryniewicz, W.
    Pałka, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/197737.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    DMLS
    mikrostruktura
    mikrotwardość
    moduł Younga
    protetyka stomatologiczna
    CAD/CAM
    tytan
    stop tytanu
    direct metal laser sintering (DMLS)
    microstructure
    microhardness
    Young's modulus
    dental prosthetics
    titanium
    titanium alloy
    Opis:
    Laserowe spiekanie proszków metali (DMLS) jest nową technologią otrzymywania konstrukcji w procedurze CAD/CAM. Celem opracowania były identyfikacja strukturalna i wyznaczenie parametrów wytrzymałościowych tytanu oraz stopów tytanu przeznaczonych na podbudowy stałych uzupełnień protetycznych otrzymywanych przy komputerowym wspomaganiu projektowania i wytwarzania. Materiałem badań były próbki z czystego technicznie tytanu – gatunek 1 do wytworzenia konstrukcji w technologii obróbki frezowaniem oraz próbki Ti6Al4V z technologii laserowego, przyrostowego spiekania proszków. Wykonano badania mikrostrukturalne i mikromechaniczne. Na ich podstawie stwierdzono, że w aspekcie wytrzymałościowym DMLS jest technologią preferowaną do wykonawstwa stałych konstrukcji nośnych dla protetyki stomatologicznej i może stanowić alternatywę dla systemu CAD/CAM z obróbką ubytkową.
    A direct metal laser sintering method (DMLS) is a new technology used for getting structures by the CAD/CAM procedures. The aim of the elaboration was a question of structural identification and setting strength parameters of titanium (Ticp) and its alloy (Ti6Al4V) which are used to serve as base for those permanent prosthetic supplements which are later manufactured with the employment of CAD/CAM systems. The research work was performed on Ticp samples – those which were intended for manufacture of structures by decrement milling working, and Ti6Al4V samples that comes from laser increment sintering of powder. According to the results obtained, the following conclusion has been derived: when strength aspect is discussed, the DMLS method is a preferred one for manufacturing of load structures in dentistry and may be an alternate way for the CAD/CAM system used in decrement processing.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2014, 82; 225-234
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dietary intake of minerals (Ca, P, Na, K, Mg, Fe, Zn, Cu, Mn, I, Se, and Mo) in young Korean adults with a self-selected diet
    Autorzy:
    Choi, M.-K.
    Seong-Hee, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/53830849.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Opis:
    This study assessed dietary 12 mineral intakes in young Korean adults with a self-selected diet. The study aimed to investigate the intake status of minerals in young adults for balanced nutritional management. As a cross-sectional study, anthropometric measurements and a dietary intake survey using a 24-hour recall method were conducted in 100 adults aged 19–31 years. Then, 12 mineral intakes of the subjects were analysed using mineral content databases. The daily mineral intakes of all subjects were 525.02 mg for Ca, 1041.89 mg for P, 3538.83 mg for Na, 2270.92 mg for K, 204.62 mg for Mg, 12.21 mg for Fe, 6.80 mg for Zn, 726.11 ug for Cu, 4.43 mg for Mn, 147.35 ug for I, 77.93 ug for Se, and 58.23 ug for Mo. Cereals (Fe, Mo), vegetables (K, Mg), meat (P, Zn, Se), and teas·beverages·alcohols (Cu, Mn) were the main food groups of various mineral intakes along with milks and dairy products (Ca) and seaweeds (I). Dietary intake of Ca, K, Mg, and Zn did not meet the recommended nutrient intake (RNI) or adequate intake (AI). In addition, the minerals in which the index of nutrient quality value was less than 1 were Ca at 0.82, K at 0.79, Mg at 0.77, and Zn at 0.88. However, the daily intake of P, Na, and Mo significantly exceeded the RNI or AI. In young Korean adults with a self-selected diet, dietary intakes of some minerals (Ca, K, Mg, and Zn) did not meet the dietary reference intakes, while some (P, Na, and Mo) were met. Therefore, we can suggest that balanced mineral intake is needed along with intake exceeding the mineral reference value.
    Źródło:
    Journal of Elementology; 2023, 28, 3; 671-685
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of homoeologous D(A) and D(B) substitutions on plant dry matter, nitrogen and phosphorus accumulation and utilization efficiency in hexaploid triticale young plants grown in hydroponics
    Wpływ homeologicznych substytucji D(A) i D(B) w siewkach heksaploidalnego pszenżyta na gromadzenie suchej masy, akumulację oraz wykorzystanie azotu i fosforu w kulturze hydroponicznej
    Autorzy:
    Oracka, Teresa
    Rybka, Zbigniew
    Łapiński, Bogusław
    Powiązania:
    https://bibliotekanauki.pl/articles/2199482.pdf
    Data publikacji:
    2020-05-14
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    akumulacja azotu
    akumulacja fosforu
    genom D
    hodowla, linie substytucyjne
    pszenżyto
    wykorzystanie azotu (NUE)
    wykorzystanie fosforu (PUE)
    breeding
    D-genome
    N accumulation
    N utilization efficiency (NUE)
    P accumulation
    P utilization efficiency (PUE)
    substitution lines
    triticale
    Opis:
    The accumulation and utilization efficiency of nitrogen and phosphorus were studied using hydroponic cultures of seedlings of the ‘Presto’ and ‘Rhino’ D(A) and D(B) substitution lines of hexaploid triticale. The results were significantly affected by homoeology group of chromosomes participating in a substitution, the A or B genome origin of replaced chromosome and genetic background of triticale cultivar. The substitutions 4D(4B) and 5D(5B) resulted in an increase of plant dry matter in relation to the non-substituted cultivars. The significant increase of N accumulation was found in 3D(3A) and 4D(4B) of ‘Rhino’, and 5D(5B) and 4D(4B) of ‘Presto’. The improvement of N utilization efficiency was recorded for 2D(2A) and 1D(1B) of ‘Presto’, and 5D(5B), 7D(7A) and 5D(5A) of ‘Rhino’. The P accumulation was distinctly improved in ‘Presto’ 5D(5B) substitution. The P utilization efficiency was improved in all substitutions containing 4D or 6D as well as in ‘Presto’ 2D(2B) and 5D(5B).
    Badano akumulację i efektywność wykorzystania azotu i fosforu w warunkach kultury hydroponicznej w siewkach linii substytucyjnych D(A) i D(B) heksaploidalnego pszenżyta odmian Rhino i Presto. Obecność substytucji chromosomów grupy D przy zachowaniu w całości genomu żytniego (R) istotnie zmieniała gospodarkę mineralną siewek. Obecność substytucji 4D(4B) i 5D(5B) powodowała zwiększenie suchej masy siewek w porównaniu do siewek bez substytucji. Obserwowano zwiększenie akumulacji azotu w siewkach odmiany Rhino z substytucjami 3D(3A) i 4D(4B) oraz odmiany Presto z substytucjami 5D(5B) and 4D(4B). Zwiększenie wykorzystania azotu zaobserwowano w substytucjach 2D(2A) and 1D(1B) odmiany Presto i w substytucjach 5D(5B), 7D(7A) i 5D(5A) odmiany Rhino. Akumulacja fosforu była istotnie zwiększona w siewkach odmiany Presto z substytucją 5D(5B). Wykorzystanie fosforu było znacznie wyższe w siewkach obu odmian zawierających substytucje chromosomów 4D i 6D oraz w siewkach odmiany Presto z substytucjami 2D(2B) i 5D(5B).
    Źródło:
    Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin; 2020, 288; 53-58
    0373-7837
    2657-8913
    Pojawia się w:
    Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ekofizjologia jodły pospolitej (Abies alba Mill.) w młodym wieku Synteza wyników badań
    Ecophysiology of silver fir [Abies alba Mill.] at the young age. Synthesis of study
    Autorzy:
    Robakowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/972850.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    jodla pospolita
    reakcja na temperature
    przystosowanie do srodowiska
    sadzonki
    Abies alba
    reakcja na swiatlo
    lesnictwo
    ekofizjologia
    drzewa lesne
    nitrogen allocation
    biomass allocation
    chlorophyll a fluorescence
    photosynthesis
    phenotypic
    plasticity
    light
    temperature
    Albies alba
    Opis:
    This article is the synthesis of the study on the ecophysiology of silver fir (Abies alba Mill.) conducted from 1998 to 2004. Seedlings of silver fir originating from different provenances were used for the experiments in a climate chamber, a nursery and in natural conditions. One of the most important results of this study was the parameterization of the model of silver fir photosynthesis. It was also found that phenotypic plasticity of some morphological and physiological patterns of silver fir at the young age was lower than that of the other tree species and depended on seedlings origin.
    Źródło:
    Sylwan; 2006, 150, 04; 44-52
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ wieku drzew oraz wieku i lokalizacji igieł w koronie na zawartość związków fenolowych w igłach młodych sosen
    Influence of tree age, needle age and location in the crown on the phenolic compounds content in needles of young Scots pines
    Autorzy:
    Karolewski, P.
    Jagodziński, A.
    Grzebyta, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/973958.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany sosnowe
    sosna zwyczajna
    Pinus sylvestris
    wiek drzew
    zawartosc zwiazkow fenolowych
    leśnictwo
    drzewa leśne
    igły sosny
    wiek igieł
    warunki świetlne
    stand age
    needle age
    light conditions
    phenols
    pinus sylvestris
    tolerance to biotic factors
    Opis:
    We studied Scots pine stands differing in age to determine the influence of tree age (6−20−year−old), needle age, and needle location in the crown and on the shoot on total soluble phenolic compounds (TPh) content in needles. These compounds are secondary metabolites, which largely determine the resistance of plants to unfavorable biotic factors such as herbivorous insects and pathogenic fungi. Examining the constitutive resistance of needles (without indications of damage), we found a statistically significant positive effect of needles age (1−3−year) and a negative effect of whorl age on TPh content, but only in older needles. We found that in spite of the large influence of the needle's age, the light conditions have a significant positive influence on the TPh content, as indicated by changes in the level of phenols with whorl age, comparing needles of different ages. The tree's age was important, but only when the cleaning was carried out changing the light conditions of needle growth. Moreover, we revealed that in the oldest needles (3−year), the position on the shoot also has a significant influence on TPh content in the needles. The level of phenols is lower in the needles growing on the bottom part of the shoot, which are shaded by needles growing on the upper side of the shoot.
    Źródło:
    Sylwan; 2011, 155, 12; 797-807
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ modyfikacji radiacyjnej elektronami na deformację plastyczną, właściwości mechaniczne oraz zużycie polietylenu GUR 1050, stosowanego na panewki endoprotez
    The influence of e-beam radiation on plastic deformation, mechanical properties and wear of the polyethylene GUR 1050 for acetabular cups
    Autorzy:
    Barylski, A.
    Cybo, J.
    Maszybrocka, J.
    Czaja, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/189777.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    polietylen UHMWPE
    modyfikacja radiacyjna
    obciążenie eksploatacyjne
    odkształcenie polimeru
    twardość
    moduł Younga
    zużycie masowe
    zużycie liniowe
    UHMW polyethylene
    radiation modification
    operational load
    polymer deformation
    hardness
    Young's modulus
    mass wear
    linear wear
    Opis:
    Odporność polietylenu na zużycie i deformację trwałą wpływa na trwałość polimerowo-metalowych układów kinematycznych. Z myślą o zwiększeniu trwałości zabiegów alloplastyki został wprowadzony polimer GUR 1050 o ciężarze cząsteczkowym 9,2*106 g/mol, który przeznaczony jest zwłaszcza na implanty medyczne. Uzasadnia to celowość oceny odporności tego materiału na zużycie i odkształcenie, a także stwierdzenie, czy jego właściwości użytkowe można podwyższyć poprzez modyfikację radiacyjną. Próbki polimeru wyjściowego (bazowego) napromieniowano elektronami, stosując krotność napromieniowania I = 1–6 dawką 26 kGy. Analiza zmian wartości odkształcenia pod wpływem obciążeń eksploatacyjnych wykazała wzrost odporności polietylenu na deformację trwałą w wyniku zastosowanego napromieniowania. Poprawa właściwości mechanicznych została potwierdzona badaniami mikroindentacyjnymi. Stwierdzono wzrost twardości i modułu Younga. Efekt ten jest zachowany mimo przeciwnego trendu, który wywołuje rosnący stopień deformacji plastycznej polimeru pod wpływem obciążenia. Badania tribologiczne wykazały znaczący wzrost (ok. 4 razy) odporności na zużycie ścierne polietylenu modyfikowanego radiacyjnie. Znaczne ograniczenie zużycia rokuje dłuższy okres współpracy węzła tarcia, co wydłuży czas użytkowania panewki w ludzkim organizmie. Przedstawione w pracy wyniki dowodzą skuteczności modyfikacji radiacyjnej, która podwyższa badane właściwości funkcjonalne proporcjonalnie do zastosowanej dawki napromieniowania elektronami.
    The resistance of polyethylene to wear and permanent deformation influences the durability of polymer-metal kinematic systems. The recently introduced polyethylene, GUR 1050, of a molecular weight of 9.2 * 106 g/mole is intended especially for medical implants. This justifies the need for evaluating the resistance of this material to wear and deformation and for determining if its functional properties can be improved by radiation modification. Samples of the initial (base) polymer were electron-irradiated with applying an irradiation multiplication factor I = 1–6 and a dose of 26 kGy. An analysis of changes in the deformation value under the influence of operational loads has shown an increase in the polyethylene resistance to permanent deformation as a result of the irradiation applied. The improvement of mechanical properties has been confirmed in micro-indentation tests. An increase in the hardness and Young's modulus was identified. This effect has been preserved despite an opposite trend that causes a growing level of plastic deformation of the polymer under the influence of load. Tribological tests have shown a significant increase (by ca. 4 times) in the resistance to abrasive wear of the polyethylene modified through irradiation. The significant wear reduction prognosticates a longer life of the friction couple, which will prolong the durability of acetabular cups in the human organism. The test results presented in the paper prove the effectiveness of modification through irradiation that enhances the tested functional properties proportionally to the applied dose of electron irradiation.
    Źródło:
    Tribologia; 2011, 5; 11-20
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena skuteczności napromieniowania wiązką elektronów w aspekcie podwyższania odporności na zużycie polietylenów GUR 1020 i GUR 1050 stosowanych na panewki endoprotez
    Evaluation of electron beam irradiation effectiveness in view of increasing wear resistance of GUR 1020 and GUR 1050 polyethylenes used for endoprosthesis cups
    Autorzy:
    Barylski, A.
    Cybo, J.
    Maszybrocka, J.
    Czaja, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/189986.pdf
    Data publikacji:
    2012
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    polietylen UHMW
    modyfikacja radiacyjna
    odkształcenie polimeru
    twardość
    moduł sprężystości
    zużycie masowe i liniowe
    UHMW polyethylene
    radiation modification
    polymer deformation
    Young's modulus
    hardness
    mass wear
    linear wear
    Opis:
    W celu zwiększenia odporności polietylenu GUR 1020 i GUR 1050 na odkształcenie plastyczne i zużycie ścierne przeprowadzono modyfikację radiacyjną. Stosowano napromieniowanie elektronami o dawce 26-156 kGy. Wraz ze wzrostem dawki napromieniowania odnotowano zwiększenie twardości i modułu sprężystości podłużnej. Stwierdzono również, że GUR 1050 (o ciężarze cząsteczkowym 9,2•106 g/mol) cechuje się 1,86 razy większą odpornością na trwałą deformację. Wskazuje to na ścisły związek właściwości polimerów z ciężarem cząsteczkowym, który dla GUR 1020 wynosi 5•106 g/mol. Potwierdzenie stanowi mniejsza wartość zużycia tribologicznego GUR 1050 niż GUR 1020, która już w stanie wyjściowym polimerów przekracza 20%. Testy tribologiczne przeprowadzone na testerach T-05 i T-01 dowodzą, że napromieniowanie elektronami (6×26 kGy) obu polimerów powoduje 4-krotne zmniejszenie zużycia w stosunku do polietylenów niemodyfikowanych. Uzyskane wyniki dowodzą skuteczności modyfikacji radiacyjnej, która rokuje możliwość wydłużenia czasu użytkowania panewek endoprotez.
    Radiation modification was conducted in order to increase the resistance of GUR 1020 and GUR 1050 polyethylenes to plastic deformation and abrasive wear. Electron irradiation of 26-156 kGy dose was applied. It was determined that the hardness and longitudinal elasticity module increase along with the increase in the dose of radiation. It was also found that GUR 1050 (of a molecular weight of 9.2•106 g / mol) is characterised by a 1.86 times greater resistance to permanent deformation. This indicates a close relationship between the properties of polymers and molecular weight, which for the GUR 1020 is 5•106 g/mol. This is corroborated by a lower value of tribological wear of GUR 1050 compared to GUR 1020, which already exceeds 20% in the initial state of polymers. Tribological tests conducted on the T-05 and T-01 testers have shown that electron irradiation (6x26 kGy) of both polymers result in a four-fold reduction in wear as compared to unmodified polyethylenes. The obtained results demonstrate the effectiveness of radiation modification, which promises the possibility of extending the service life of endoprosthesis cups.
    Źródło:
    Tribologia; 2012, 4; 17-23
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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