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Tytuł:
Factors associated with suboptimal complementary feeding practices among mothers of infants and young children in India
Autorzy:
Idowu, A.M.
Kayode, G.A.
Adekanmbi, V.T.
Powiązania:
https://bibliotekanauki.pl/articles/28765554.pdf
Data publikacji:
2022
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Opis:
Objectives. To examine the current complementary feeding practices among infants and young children aged 6 to 23 months in India, and factors influencing these practices at child, parental, household and community levels. Material and methods. Data on 74,095 last-born children aged 6 to 23 months used in this study were obtained from the 2015 India Demographic and Health Survey (IDHS). Complementary feeding indicators (timely introduction of complementary foods to infants aged 6 to 8 months old, minimum meal frequency, minimum dietary diversity, and minimum acceptable diets) were estimated, and their associated factors were identified using descriptive and multivariate (logistic regression) analyses. Results. The prevalence of the timely introduction of complementary foods to infants aged 6 to 8 months was 45.1%. The proportion of children between ages 6 to 23 months who received the minimum meal frequency, minimum dietary diversity and minimum acceptable diets were 36%, 21% and 9.1%, respectively. Findings from the multivariate analyses revealed that mothers of infants delivered at home, mothers who had no antenatal check-up, mothers who are Hindus, mothers living in rural areas or those from the Western/Northern geographical regions of India were at higher risk of suboptimal complementary feeding practices. Conclusions. Our findings indicate that, among other factors, achieving the recommended four or more antenatal visits was consistently associated with improved complementary feeding practices. Thus, policies that ensure increased coverage and quality of antenatal check-up could improve complementary feeding practices of mothers in India, and help towards achieving sustainable development goal 2, targeted at eradicating hunger and malnutrition.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2022, 73, 4; 403-411
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
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:
Photobiomodulation with cluster does not present superior results to placebo in young people with chronic non-specific lumbar pain
Autorzy:
Bohnenberger Escanes, I.B.
Cordeiro Baierle, I.
de Assis, T.
Neves, M.
Flores, L.J.F.
Bertolini, G.R.F.
Powiązania:
https://bibliotekanauki.pl/articles/2098208.pdf
Data publikacji:
2020
Wydawca:
Instytut Medycyny Wsi
Tematy:
lumbar section
non-specific dysfunction
human morbidity
photobiomodulation
laser therapy
young patient
Opis:
Introduction and objective. Since the characteristic of chronic non-specific lumbar dysfunction presents a high prevalence and morbidity, and that there are still conflicting results with the use of photobiomodulation, the aim of this study was to analyze the effect of photobiomodulation application in patients with chronic non-specific lombalgy. Materials and method. A quantitative, experimental, randomized study composed of 21 volunteers randomly separated into two groups: 1) the intervention group (IG), who were given an application of photobiomodulation (LED (617nm ±10%, 1,500 mW) and low-level laser therapy (830nm, 150 mW, beam area 12.57mm), combined energy of 8.4 J per area for one minute in four different locations: in regions of greatest pain referred to palpation, on a bilateral basis, area of the applicator – 23,8 cm2). 2) the control group (CG), in which the device remained switched-off during therapy. All subjects were evaluated by McGill and Roland Morris questionnaires before and at the end of 6 interventions (3 weeks). Results. For both McGill and Roland Morris total pain rates, there was no inter-group interaction or interaction between evaluation and group (p>0.05). In the comparison between evaluations (before and after), there was a significant difference (p<0.001). Conclusions. The use of photobiomodulation in these parameters in young patients with chronic non-specific lombalgy, was not more effective than the placebo for the relief of painful symptoms. Nor did it promote a decrease in the repercussion of lombalgy in the performance of daily activities.
Źródło:
Journal of Pre-Clinical and Clinical Research; 2020, 14, 4; 107-110
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Socio-economic development, level of urbanization and consumption of selected food products as factors in the prevalence of overweight and obesity among youths and young adults in Poland
Autorzy:
Klatka, M.
Zienkiewicz, E.
Kołłątaj, W.
Zienkiewicz, T.
Kołłątaj, B.
Powiązania:
https://bibliotekanauki.pl/articles/2085463.pdf
Data publikacji:
2020
Wydawca:
Instytut Medycyny Wsi
Tematy:
obesity
urbanization
adolescents
socio-economic development
Opis:
Introduction and objective. Obesity and overweight among teenagers and young adults pose serious problems for the Polish health care system. The aim of this study was to assess the relationships between the prevalence of overweight and obesity and the level of urbanization, consumption of selected food products and socio-economic development in the provinces in Poland. Materials and method. The material used in this study is based on data published by the Central Statistics Office (GUS) for population, components of the Human Development Index (HDI), urbanization level (URBI), average monthly consumption of selected food products per person, and the percentage of obese and overweight people in the Polish provinces. The prevalence of overweight and obesity in all 16 provinces was analysed in the context of the URBI, HDI, and the average monthly consumption of selected food products. Results. There was no a statistically significant correlation between the number of overweight and obesity cases and the levels of HDI and URBI. The negative correlations were found between the consumption of sugar and URBI (-0,710, p=0.002), bread and grain product consumption (-0.642; p=0.007) and fresh milk consumption (-0.594; p=0.015). Fish consumption correlated with URBI at a moderate level (0.550; p=0.027). The consumption of oils and fats strongly correlated with HDI (-0.788; p < 0,001). In the group of overweight woman, a moderate negative correlation was noted (-0.511; p=0.043) in cheese and curd consumption. Conclusions. The high level of economic development and urbanization have no direct impact on the prevalence of overweight and obesity in Poland. The results of the study indicate existing dependencies of the consumption of some of selected products with respect to the level of urbanization.
Źródło:
Annals of Agricultural and Environmental Medicine; 2020, 27, 1; 139-145
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
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:
The mystery of Mystriosaurus: Redescribing the poorly known Early Jurassic teleosauroid thalattosuchians Mystriosaurus laurillardi and Steneosaurus brevior
Autorzy:
Sachs, S.
Johnson, M.M.
Young, M.T.
Abel, P.
Powiązania:
https://bibliotekanauki.pl/articles/20267.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
The genus Mystriosaurus, established by Kaup in 1834, was one of the first thalattosuchian genera to be named. The holotype, an incomplete skull from the lower Toarcian Posidonienschiefer Formation of Altdorf (Bavaria, southern Germany), is poorly known with a convoluted taxonomic history. For the past 60 years, Mystriosaurus has been considered a subjective junior synonym of Steneosaurus. However, our reassessment of the Mystriosaurus laurillardi holotype demonstrates that it is a distinct and valid taxon. Moreover, we find the holotype of “Steneosaurus” brevior, an almost complete skull from the lower Toarcian Whitby Mudstone Formation of Whitby (Yorkshire, UK), to be a subjective junior synonym of M. laurillardi. Mystriosaurus is diagnosed in having: a heavily and extensively ornamented skull; large and numerous neurovascular foramina on the premaxillae, maxillae and dentaries; anteriorly oriented external nares; and four teeth per premaxilla. Our phylogenetic analyses reveal M. laurillardi to be distantly related to Steneosaurus bollensis, supporting our contention that they are different taxa. Interestingly, our analyses hint that Mystriosaurus may be more closely related to the Chinese teleosauroid (previously known as Peipehsuchus) than any European form.
Źródło:
Acta Palaeontologica Polonica; 2019, 64, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ jakościowych determinant produktów mleczarskich na wybór dyskontów jako miejsca ich zakupu przez młodych nabywców
Effect of qualitative determinants of dairy products on choosing discount stores as place of purchasing them by young buyers
Autorzy:
Angowski, M.
Kijek, T.
Skrzypek, A.
Powiązania:
https://bibliotekanauki.pl/articles/2130253.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Technologów Żywności
Tematy:
sklepy dyskontowe
produkty mleczarskie
zachowania młodych nabywców
jakość
Opis:
Przemiany zachodzące w sektorze handlowym powodują, że współczesny rynek produktów żywno- ściowych charakteryzuje się dużą zmiennością i nieprzewidywalnością. Znajomość i zrozumienie czynni- ków kształtujących wybór produktów i miejsc ich zakupu przez nabywców jest ważnym elementem kreo- wania strategii konkurencyjnej podmiotów działających na danym rynku W Polsce obserwowany jest rozwój sieci dyskontowych. Do niedawna polskich nabywców zachęcały do sklepów dyskontowych prze- de wszystkim niskie ceny, jednak z czasem rosnące wymagania klientów tych sklepów stały się głównym czynnikiem rozwoju nowych modeli sprzedaży w dyskontach. Rozpoczęły one proces zmian koncepcji swoich formatów poprzez ulepszenie oferty towarów pod względem jakości. Celem pracy była ocena wpływu wybranych cech jakościowych produktów żywnościowych na decy- zje nabywców związane z wyborem sklepów dyskontowych jako miejsca zakupu. Część badawczą opra- cowano na podstawie badań sondażowych, które zostały przeprowadzone w 2016 roku na grupie 358 młodych nabywców produktów mleczarskich, przy wykorzystaniu metody doboru celowego. W zbieraniu danych wykorzystano metodę CAWI wspomaganą metodą PAPI. W analizach statystycznych opisujących zachowania badanych nabywców zastosowano analizę czynnikową, a do modelowania decyzji konsumen- tów w zakresie wyboru miejsca zakupu (tj. sklepu dyskontowego) wykorzystano model probitowy. W przeprowadzonych badaniach potwierdzono kluczowe znaczenie cech jakościowych przy podejmowa- niu decyzji zakupowych młodych nabywców produktów mleczarskich. Po przeanalizowaniu wpływu czynników jakościowych na wybór sklepu dyskontowego jako miejsca zakupu produktów mleczarskich stwierdzono, że najsilniejszy wpływ na decyzje młodych konsumentów miały cechy sensoryczne oraz zdrowotność produktów.
Źródło:
Żywność Nauka Technologia Jakość; 2019, 26, 2; 152 - 161
1425-6959
Pojawia się w:
Żywność Nauka Technologia Jakość
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Filling the Corallian gap: New information on Late Jurassic marine reptile faunas from England
Autorzy:
Foffa, D.
Young, M.T.
Brusatte, S.L.
Powiązania:
https://bibliotekanauki.pl/articles/21510.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
Two of the best known Mesozoic marine reptile assemblages can be found in units deposited in the Jurassic SubBoreal Seaway of the UK: the late Middle Jurassic Oxford Clay Formation (OCF) and Late Jurassic Kimmeridge Clay Formation (KCF). They record two very differently structured faunas, but understanding the turnover between them is hampered by a gap in the fossil record that spans much of the Oxfordian, the so-called “Corallian gap”. We provide a comprehensive review of specimens from the Corallian Group (CG) of the UK, which includes the first descriptions of several fossils, particularly teeth. We demonstrate that there is a severe reduction in observed marine reptile diversity during the Oxfordian, with several Callovian taxa well known from the OCF not persisting into the Corallian strata, including small-to-mid-sized pliosaurids and longirostrine teleosaurids. We do, however, find evidence that at least one member of each key OCF lineage (plesiosauroids, pliosaurids, ichthyosaurs, and thalattosuchians) survived into the Corallian interval, and that one keystone KCF lineage (the Torvoneustes line of metriorhynchid thalattosuchians) was present during this time, indicating an earlier radiation of this group than previously thought. We suggest that faunal turnover between the OCF and KCF may have been driven by environmental perturbations during the Oxfordian, which selectively removed small bodied pliosaurids and longirostrine teleosaurids from the Jurassic Sub-Boreal Seaway, but less affected metriorhynchids, plesiosauroids, and ophthalmosaurid ichthyosaurs. The preferential removal of taxa from the sub-Boreal realm may have helped facilitate the radiation of lineages that became dominant during the Late Jurassic.
Źródło:
Acta Palaeontologica Polonica; 2018, 63, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tibial tuberosity. Trochlear groove distance in symptom-free young subjects and the proposal for a new guideline value to evaluate patellofemoral pain syndrome in case of trochlea dysplasia
Autorzy:
Alk, A.
Bantle, V.
Martin, T.
Wang, R.
Kasprzyk, M.
Kozak, J.
Powiązania:
https://bibliotekanauki.pl/articles/2063813.pdf
Data publikacji:
2018
Wydawca:
Międzynarodowe Stowarzyszenie na rzecz Robotyki Medycznej
Tematy:
zespół bólu rzepkowo-udowego
kolano biegacza
mobilny system ultrasonograficzny oparty na smartfonie
patellofemoral pain syndrome
PFPS
TT-TG
smartphone-based mobile sonography system
Opis:
For the evaluation of the patellofemoral pain syndrome (PFPS) the mediolateral distance between the tibial tuberosity and the trochlear groove (TT-TG) is considered as the gold standard. In this work, we propose to replace the measurement of the TT-TG with conventional tomographic or radiological section images by a smartphone-based mobile sonography system. This new system allows to provide not only ultrasound imaging but also a measuring method for determining the TT-TG using a smartphone as a mobile tracking unit. Moreover, the system supports the diagnosis by acquiring an additional parameter: the mediolateral distance between the intercondylar notch and the tibial tuberosity (TT-IN). The distinctive structure of the intercondylar notch simplifies the examination compared to using the trochlear groove alone. A feasibility study conducted for this paper indicates that this second guideline value is an adequate replacement for the conventional measurement of the TT-TG. Especially in case of trochlea dysplasia the detection and definition of the groove may be difficult and the TT-IN value offers a reasonable alternative. Our study shows that the proposed sonography system is able to accurately determine the TT-TG in a population of symptom-free young subjects. These measurements range from 13.1 ± 4.2 mm for male to 14.8 ± 3.4 mm for female subjects. Our findings correspond to the postulated values of the gold standard. We are able to show that the values for the TT-IN are in a comparable range with 14.4 ± 4.1mm for men and 13.6 ± 4.0 mm for women. We are convinced that this study strongly indicates that the TT-IN is a useful value that is easy to measure with a mobile ultrasound-based measurement system and can provide the same level of diagnostic value compared to the gold standard TT-TG. In conclusion, a new guideline value is presented to complement the measurement of the TT-TG when a pathological anatomy prevents the detection of the groove.
Źródło:
Medical Robotics Reports; 2018, 7; 26--30
2299-7407
Pojawia się w:
Medical Robotics Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Model for Fatigue Crack Growth in the Paris Regime under the Variability of Cyclic Hardening and Elastic Properties
Autorzy:
Kebir, T.
Benguediab, M.
Imad, A.
Powiązania:
https://bibliotekanauki.pl/articles/97819.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
cyclic plastic strain
elastic properties
cyclic hardening parameters
Young's modulus
variability
crack tip
fatigue crack growth
constants of the Paris law
Al-alloys
Opis:
Over the last 60 years, several models have been developed governing different zones of fatigue crack growth from the threshold zone to final failure. The best known model is the Paris law and a number of its based on mechanical, metallurgical and loading parameters governing the propagation of cracks. This paper presents an analytical model developed to predict the fatigue crack propagation rate in the Paris regime, for different material properties, yield strength (σy), Young’s modulus (E) and cyclic hardening parameters (K’, n’) and their influence by variability. The cyclic plastic deformation at a crack tip or any other cyclic hardening rule may be used to reach this objective, for to investigate this influence, these properties of the model are calibrated using available experimental data in the literature. This FCGR model was validated on Al-alloys specimens under constant amplitude load and shows good agreement with the experimental results.
Źródło:
Fatigue of Aircraft Structures; 2017, 9; 117-135
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stan wiedzy kształcącej się młodzieży o opakowaniach aktywnych i inteligentnych
State of knowledge of young people on active and intelligent packaging
Autorzy:
Fietz, M.
Lesiow, T.
Powiązania:
https://bibliotekanauki.pl/articles/5435.pdf
Data publikacji:
2017
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
opakowania aktywne
opakowania inteligentne
innowacje
ludzie mlodzi
preferencje konsumentow
badania ankietowe
stan wiedzy
Opis:
Celem pracy było zbadanie stanu wiedzy młodzieży na temat opakowań aktywnych i inteligentnych oraz stopnia deklarowanej przez nią gotowości do dokonywania zakupu tak zapakowanych produktów żywnościowych. Sporządzono autorski kwestionariusz składający się z 20 pytań, w tym 5 pytań charakteryzujących respondenta. O wypełnienie wersji papierowej kwestionariusza poproszono uczniów z Zespołu Szkół Ponadgimnazjalnych nr 2 w Oławie, a wersja elektroniczna została skierowana do studentów Uniwersytetu Ekonomicznego we Wrocławiu oraz Uniwersytetu Przyrodniczego we Wrocławiu. Do analizy przyjęto 254 poprawnie wypełnione ankiety. Zebrane dane opracowano za pomocą programu Microsoft Excel 2010. Tylko 21,3% uczniów szkół średnich posiada wiedzę o opakowaniach aktywnych lub inteligentnych, ponad dwukrotnie mniej aniżeli grupa badawcza studentów (52,5%). Po zapoznaniu ankietowanych z istotą działania obu rodzajów opakowań zarówno uczniowie, jak i studenci, w podobnym stopniu, pozytywnie zadeklarowali chęć nabywania produktów zapakowanych odpowiednio w opakowania aktywne (67,3%) i inteligentne (95,3%), pod warunkiem nieznacznego wzrostu ich cen, tzn. poniżej 0,50 zł (43,9%) lub od 0,50 zł do 1,00 zł (21,8%). Głównym źródłem wiedzy o obu rodzajach opakowań są Internet oraz szkoła i uczelnia. Młodzi konsumenci dostrzegają ważną rolę przemysłu w upowszechnieniu opakowań innowacyjnych. Chcą nie tylko, aby te opakowania stopniowo znalazły się na rynku, ale także chcą otrzymać pełną informacje, jaką rolę spełniają one w przypadku danego produktu i czy zapakowany w nie produkt jest bezpieczny.
The aim of the work was to examine the state of knowledge of young people about active and intelligent packaging and the level of declared readiness to purchase such packaged food products. An author’s questionnaire was prepared consisting of 20 questions, including 5 characterizing the respondents. To fill out the paper version of the questionnaire were asked pupils from upper secondary School No 2 in Oława and the electronic version was directed to the students from University of Economics and Univeristy of Life Sciences in Wroclaw. For the analysis 254 correctly filled questionnaires were accepted. The collected data were developed using Microsoft Excel 2010. Only 21.3% of secondary school pupils were familiar with the term active or intelligent packaging, more than twice less than the research group of students (52.5%). After familiarizing the respondents with the essence of action of both types of packaging, both pupils and students, to a similar degree, positively declared their willingness to purchase products packed in active (67.3%) and intelligent (95.3%) packaging, provided that their price rises slightly, i.e. below 0.50 PLN (43.9%) or from 0.50 PLN to 1.00 PLN (21.8%). The main source of knowledge about both types of packaging is the Internet, school and university. Young consumers see a significant role of industry in the dissemination of innovative packaging. They want not only that these packages are gradually found on the market, but also to receive full information, what role they play in the case of a given product and whether the product packed in it is safe.
Źródło:
Nauki Inżynierskie i Technologie; 2017, 3(26)
2449-9773
2080-5985
Pojawia się w:
Nauki Inżynierskie i Technologie
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:
Wpływ sposobu pielęgnowania uprawy na wzrost dębu
Effect of cleaning treatments on a growth of sessile oak in young growth phase
Autorzy:
Milewski, M.
Andrzejczyk, T.
Powiązania:
https://bibliotekanauki.pl/articles/987058.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
uprawy lesne
zabiegi pielegnacyjne
czyszczenia wczesne
drzewa lesne
dab bezszypulkowy
Quercus petraea
wzrost roslin
przyrost drzew
przyrost piersnicy
przyrost wysokosci
wspolczynnik smuklosci
silviculture
stand tending
cleaning
quercus petraea
Opis:
We examined growth of oaks after cleaning carried out in a 11−year−old stand in Kolumna Forest District (central Poland). The purpose of the treatment was to remove naturally regenerated species mainly birch. Four different cleaning variants were applied. They differed in time of application and height of unwanted trees i.e. spring cleaning at ground level in every second oak row (W1) or over the entire surface (W2), breaking at a height of 1 m in spring (W3) or in summer (W4) and control (K) where trees were not removed. We analyzed height and its increment, dbh and its increment as well as slenderness, i.e. h:d ratio, in 4−year−long period after treatment. The study reviled that the cleaning, regardless of the applied method, significantly improved oak growth, while lack of cleaning led to increased competition of birch. The pressure from the other species firstly reduced diameter increment and later the height increment (tab.). As a result, the h:d ratio of oaks increased. The 4−year height and dbh increment were similar in all the applied treatments but in the last year of study the dbh increment in variants W2 and W4 was significantly higher than in W1 and W3 due to greater competition of birch in these variants (figs. 1 and 2). Cleaning done on a limited area provides satisfactory growth and stability for young oaks, but it is probable that such a stand needs more frequent intervention than the one from W2 cleaning variant.
Źródło:
Sylwan; 2017, 161, 03; 189-195
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ terminu i sposobu wycinania brzozy brodawkowatej na jej regenerację i wzrost w uprawie dębowej
Effect of time and cleaning method on silver birch sprouting ability and growth in oak young growth
Autorzy:
Andrzejczyk, T.
Milewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/987203.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
hodowla lasu
uprawy debowe
mlodniki debowe
zabiegi pielegnacyjne
ciecia pielegnacyjne
wycinanie drzew
terminy zabiegow
gatunki domieszkowe
brzoza brodawkowata
Betula pendula
zdolnosc regeneracyjna
regeneracja roslin
wzrost roslin
przyrost wysokosci
betula pendula
sprouts
stump height
growth
cleaning
silviculture
Opis:
The objective of the study was to examine the sprouting ability and growth of silver birch after cleaning in a 11−year−old oak stand in Kolumna Forest District (central Poland). The purpose of the cleaning was to remove naturally regenerated birch. Six different treatments were applied as a cleaning methods. They differed in time of application and height of cutting or breaking the birch sprouts, i.e. spring cleaning at ground level in every second oak row (W1) or over the entire surface (W2), cutting or breaking at a height of 1 m in spring (W3a, W3b) and cutting or breaking at a height of 1 m in summer (W4a, W4b). We analyzed the formation of new sprouts and their height and dbh increment over a 4−year period after the treatment. On average, after spring cleaning 10−20% of birches produced new sprouts when birch was cut at the ground level. When cut at one meter, 85−90% of birches produced new sprouts. Cleaning in the summer decreased the sprouting ability by 20−25%. There were also significant differences in height growth of sprout between spring (better) and summer (worse) time of cleaning. There were no significant differences in sprouting ability and sprout growth between cutting and breaking when done at the same time of the year. Thus, the most effective way to restrict competition of birch in young oak stands is cutting at ground level.
Źródło:
Sylwan; 2017, 161, 04; 295-302
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyka i zastosowania kompozytów jednopolimerowych
Characteristic and applications of single polymer composites
Autorzy:
Żenkiewicz, M.
Moraczewski, K.
Rytlewski, P.
Stepczyńska, M.
Żuk, T.
Powiązania:
https://bibliotekanauki.pl/articles/947028.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
kompozyty jednopolimerowe
wytrzymałość na rozciąganie
moduł Younga
adhezja międzyfazowa
temperatura topnienia
single polymer composites
tensile strength
Young's modulus
interface adhesion
melting temperature
Opis:
Artykuł stanowi przegląd literatury dotyczącej właściwości i zastosowań kompozytów jednopolimerowych (SPC), stosunkowo nowej i obiecującej grupy materiałów polimerowych o dużych możliwościach aplikacyjnych. Omówiono rodzaje i wybrane właściwości SPC i porównano ich najważniejsze cechy: adhezję na granicy wzmocnienia i osnowy kompozytu, różnicę wartości temperatury topnienia fazy krystalicznej wzmocnienia i osnowy, wytrzymałość na rozciąganie i moduł Younga. Scharakteryzowano SPC wytwarzane obecnie w skali przemysłowej.
This paper constitutes a review of the literature concerning properties and applications of the single polymer composites (SPC). These materials are a relatively new and promising group of polymer composites which have good mechanical properties and high potential of application. The types and selected properties of single polymer composites were discussed. The most significant of these properties include adhesion at the interface of reinforcement and matrix, different melting points of crystalline phase of reinforcement and matrix, tensile strength and Young's modulus. Additionally, SPC currently produced in an industrial scale were characterized.
Źródło:
Polimery; 2015, 60, 1; 3-11
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 35

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