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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:
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
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:
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:
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:
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:
"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:
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:
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:
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:
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:
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 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
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