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Wyświetlanie 1-15 z 153
Tytuł:
On Lie algebras of vector fields related to Riemannian foliations
Autorzy:
Rybicki, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1311816.pdf
Data publikacji:
1993
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Riemannian foliation
Lie algebra
ideal
isomorphism
vector field
generalized manifold
stratification
Opis:
Riemannian foliations constitute an important type of foliated structures. In this note we prove two theorems connecting the algebraic structure of Lie algebras of foliated vector fields with the smooth structure of a Riemannian foliation.
Źródło:
Annales Polonici Mathematici; 1993, 58, 2; 111-122
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial and seasonal variability of temperature and salinity in Bransfield Strait and Admiralty Bay, Antarctica
Autorzy:
Rakusa-Suszczewski, Stanisław
Powiązania:
https://bibliotekanauki.pl/articles/2052591.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctica
T/S stratification
annual cycles
Źródło:
Polish Polar Research; 1996, 17, 1-2; 29-42
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Loss of tolerance to desiccation in germinated Norway maple (Acer platanoides L.) seeds. Changes in carbohydrate content
Autorzy:
Pukacka, S.
Powiązania:
https://bibliotekanauki.pl/articles/41745.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
glucose
stratification
viability
fructose
Acer platanoides
desiccation
tolerance loss
galactose
seed
stachyose
sucrose
Norway maple
raffinose
carbohydrate content
dormancy
Opis:
Carbohydrates were analyzed in Norway maple embryo axes and cotyledons after imbibition, in the middle of cold stratification, before germination and during radicle protrusion to 8-10 mm and 20-25 mm. Simultaneously desiccation tolerance of seeds was determined by tetrazolium (TTC) test, after desiccation of seeds to 10-20% of water content. The cotyledons were tolerant to desiccation throughout all stratification and germination period. Embryo axes became sensitive to desiccation when hypocotyls-radicle protrusion reached 20-25 mm length. In this period the significant increase of monosaccharides: glucose, fructose and galactose in embryo axes occurred. This was not observed in cotyledons. During the germination period significant decrease of sucrose and raffinose content was noted in embryo axes and cotyledons. Relatively less changes appeared in stachyose content in embryo axes while in cotyledons it decreased evidently. The mass ratio of sucrose to oligosaccharides was higher in cotyledons of germinated seeds. The marked decrease of mass ratio of oligo to monosaccharides was observed in embryo axes in the last period of germination. The role of carbohydrates in loosing tolerance to desiccation in germinated Norway maple seeds is discussed.
Źródło:
Dendrobiology; 2001, 46
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Breaking of seed dormancy, germination and seedling emergence of the common hawthorn (Crataegus monogyna Jacq.)
Autorzy:
Bujarska-Borkowska, B
Powiązania:
https://bibliotekanauki.pl/articles/41072.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
stratification
Crataegus monogyna
common hawthorn
scarification
breaking
seedling emergence
hawthorn
germination
seed dormancy
Opis:
The most advantageous time for collecting fruits of the common hawthorn (Crataegus monogyna Jacq.) falls on October, when they are fully ripe. The stones extracted from the fruits must be dried at room temperature to the moisture content of about 10%. The dormancy of the common hawthorn seeds can be overcome by their stratification in a moist medium in one of the three thermal regimes: - 25°/3°C (16 weeks at 25°C followed by 15-18 weeks at 3°C, i.e. to the time when the first seedlings start to appear) - 20~30°/3°C (16 weeks at 20~30°C (16+8 hrs/day) followed by 15-18 weeks at 3°C, i.e. to the time when first seedlings start to appear) - 20~30°/3°C (16 weeks at 20~30°C (24+24 hrs) followed by 15-18 weeks at 3°C, i.e. to the time when first seedlings start to appear) Having been stratified, the seeds germinate vigorously (in 3-5 weeks) and at a high percentage at temperatures of 3~10°, 3~15°, 3~20° and 3~25°C, (16+8 hrs/day) and the seedlings emerge at 3~20°C (16+8 hrs/day) in 4-6 weeks. Storage for one year at -3°C in the case of the seeds dried after harvest to the moisture content of 10% does not reduce their germination capacity. Stones scarification in concentrated sulphuric acid for 120 minutes followed by stratification at 3°C has an adverse effect on seed emergence at the temperature 3~20°C (16+8 hrs/day). It is recommended that stratified seeds should be sown into the still cool soil at the end of March or the beginning of April, as the increased temperature induces the secondary dormancy in seeds.
Źródło:
Dendrobiology; 2002, 47 Supplement
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On stratification of population on the basis of auxiliary variable and the selected sample
O warstwowaniu populacji na podstawie zmiennej pomocniczej i próby po jej wylosowaniu
Autorzy:
Wywiał, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/905368.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
stratification after sample selection
conditional estimation
conditional mean
conditional variance
Opis:
Survey sampling conditional methods are usually connected with poststratification estimators for domains and with inference on the basis of regression models or contingency tables. These problems were considered e.g. by Rao (1985), Tillé (1998), Williams (1962). The problem of stratification of a population on the basis of observations on the variable under study in a sample was considered by e.g. Dalenius (1957). We deal with the problem of appropriate division of a simple sample into sub-samples of equal sizes. This partition of the sample leads to clustering a population into sub-populations. Each of these sub-populations includes one and only one previously created sub-sample. The linear combinations of statistics from the sub-samples are used for estimation of a population mean. The coefficients of this linear combination are proportionate to the sizes of the sub-populations. This statistic is the unbiased estimator of the population mean. The variance of the estimator has been derived. The example of determining of the estimator parameters is presented. Moreover, some generalisations of proposed estimators are suggested.
Problem estymacji wartości przeciętnej w populacji na podstawie próby prostej losowanej bezzwrotnie z populacji ustalonej i skończonej jest rozważany. Zakładamy, że wartości zmiennej pomocniczej są obserwowane w całej populacji. Próba prosta, po jej wylosowaniu, jest porządkowana zgodnie z rosnącymi wartościami zmiennej pomocniczej. Następnie próba ta jest dzielona na H > 1 równolicznych podprób. Potem zlicza się, ile jest elementów populacji pomiędzy elementami rozdzielającymi podpróby. Udziały tych liczebności stanowią współczynniki kombinacji liniowej, m.in. średnich z podprób. Taki warunkowy estymator daje nieobciążone (warunkowo i bezwarunkowo) oceny wartości średniej w populacji. Pokazano przykład oceny wartości średniej w populacji z wyznaczeniem wartości wariancji warunkowych i bezwarunkowych estymatora.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2002, 156
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An expert system supporting risk stratification in acute coronary syndromes
Autorzy:
Grabowski, M.
Filipiak, K. J.
Rudowski, R.
Opolski, G.
Powiązania:
https://bibliotekanauki.pl/articles/1965787.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska
Tematy:
expert system
decision making
acute coronary syndrome
risk stratification
Opis:
The aim of the project was to create a computer program, an expert system (ES), which would support physicians when a management for patients with acute coronary syndrome needs to be chosen. A knowledge database was created with the support of clinical experts, based on the current management standards. Data from new patients are added to the case database. The inference engine integrates two types of reasoning rule-based and case-based. The ES gives unambiguous and objective answers, its recommendation are reliable. At present, the ES is tested in clinical practice. Strategies recommended by the ES are compared with the management applied in a clinic.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 2; 281-286
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przemiany struktury społecznej na Ukrainie w okresie niezawisłości
Transformations of Social Structure in Ukraine during the Decade of Independence
Autorzy:
Chmelko, W.
Powiązania:
https://bibliotekanauki.pl/articles/2138562.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
labour
macrostructural changes
stratification
Opis:
The paper traces some macrostructural societal changes in the Ukrainian society during the independence, namely, the change of a societal labour structure, the changes of class, institutional, and stratificational structures, and also the change in proportions of some political orientations' distribution among the population of Ukraine.
Źródło:
Studia Socjologiczne; 2004, 4(175); 11-31
0039-3371
Pojawia się w:
Studia Socjologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selekcja pochodzeniowa do szkoły średniej i na studia
Social Status and Selection of Candidates to Secondary Schools and Universities
Autorzy:
Domański, H.
Powiązania:
https://bibliotekanauki.pl/articles/2137857.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
educational inequalities
stratification
thresholds of education
reproduction of social barriers
nierówności edukacyjne
stratyfikacja
reprodukcja barier społecznych
progi kształcenia
Opis:
The following article is devoted to educational ineąualities in Poland as viewed over the course of time. Educational ineąualities can be measured in terms of effect the of social origin on the selection of students to the first and second threshold of education, i.e. when moving from primary to secondary school, and from secondary school to university. The results of various analyses conducted so far point to the especially decisive role of social origin at the first threshold (primary to secondary school). Moreover, this effect has been shown to be persistent over time. However, according to my analyses, the effect of social origin on the two educational thresholds rose dramatically in the 1990's and then fall to the level present before transformation. This analysis is based on data from research carried out on national samples from 1982 to 2002 in Poland.
Przedmiotem niniejszego studium są nierówności edukacyjne w Polsce, wzywane z perspektywy zmian w czasie. Wskaźnikiem nierówności jest wpływ chodzenia społecznego na selekcję na pierwszym i na drugim progu kształcenia tj. przy przechodzeniu ze szkoły podstawowej do średniej i ze szkoły średniej do wyższej. Wyniki dotychczasowych analiz wskazywały na decydujące znaczenie wpływu pochodzenia społecznego jednostek na selekcją występującą na pierwszym progu kształcenia. Drugą prawidłowością było utrzymywanie się siły tej zależności na mniej więcej tym samym poziomie. Tymczasem, w świetle analiz, które przedstawiam poniżej, wpływ pochodzenia społecznego na przejście obydwu progów znacząco wzrósł w latach dziewięćdziesiątych, a następnie zmniejszył się, wracając do poziomu sprzed zmiany ustroju. Empiryczną przesłanką ustaleń są wyniki systematycznych porównań danych pochodzących z ogólnopolskich badań realizowanych od 1982 do 2002 roku.
Źródło:
Studia Socjologiczne; 2004, 2(173); 65-93
0039-3371
Pojawia się w:
Studia Socjologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using the Internet to determine fatal cardiovascular risk in the Polish population
Autorzy:
Trzeciak, Bartosz G.
Jaśkiewicz, Michał
Siebert, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/1954079.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska
Tematy:
cardiovascular disease
internet
risk stratification
Opis:
We present the first program in Poland to determine the cardiovascular disease (CVD) risk of individuals, called Ryzyko. The program is freely available at www.ryzyko.amg.gda.pl. Our program, partially based on the European SCORECARD program, takes into account parameters such as age, sex, systolic blood pressure, total cholesterol concentration and cigarette smoking, and enables internet users to observe themselves to determine the degree of their CVD risk.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 3; 439-440
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diurnal variations in nitrogen, phosphorus and iron compounds in the Southern Baltic Sea
Autorzy:
Sikorowicz, G.
Falkowska, L.
Burska, D.
Dunajska, D.
Pryputniewicz, D.
Magulski, R.
Lewandowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/47649.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
iron
nutrient
Gdansk Deep
nitrogen
density stratification
diurnal variation
Baltic Sea
oxygen condition
phosphorus
Opis:
In order to assess their short-term variability, nutrient concentrations were measured at standard depths at 2 h intervals in the deepest region of the Gdańsk Deep during the first ten days of June 2001. The mean concentrations of nutrients in the euphotic zone were: NN (NO2 −, NO3 −, NH4 +) – 1.93 μmol dm−3, PO4 3− – 0.12 μmol dm−3 and Fetot – 0.11 μmol dm−3. During daylight hours, when the rate of assimilation was fastest, concentrations of nitrogen, phosphorus and iron compounds were very low. The phosphate concentration fell to a minimum (0.03 μmol dm−3) between 04:00 and 10:00 hrs, while total iron dropped to 0.01 μmol dm−3 between 10:00 and 16:00 hrs. Both levels were below the limiting values for phosphorus and iron. At night, concentrations of NO3 − and PO4 3− rose by 25%, those of NH4 + and Fetot by 35%. The mean molar ratios of NN:PO4 3− and Fetot:PO4 3− in the surface layer were subject to significant daily fluctuations. The molar NN:PO4 3− ratio was higher than the optimum value established for the Baltic Sea. Below the halocline, the concentrations of dissolved iron and phosphorus rose as a result of diffusion from sediments in response to changing redox conditions.
Źródło:
Oceanologia; 2005, 47, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nutrient flux fuels the summer primary productivity in the oligotrophic waters of the Gulf of Aqaba, Red Sea
Autorzy:
Badran, M.I.
Rasheed, M.
Manasrah, R.
Al-Najjar, T.
Powiązania:
https://bibliotekanauki.pl/articles/47744.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Aqaba Gulf
biological stress
diffusion model
chlorophyll a
oligotrophic water
primary productivity
thermohaline stratification
nutrient flux
Red Sea
Opis:
The thermohaline characteristics of the Gulf of Aqaba, Red Sea, depict a welldefined seasonal pattern of winter mixing from December to April and summer stratification from May to November. This thermohaline structure is a major controlling factor of the nutrient, chlorophyll a and primary productivity seasonal cycles. The nitrate and chlorophyll a concentration records generated down to 200 m at a vertical resolution of 25 m – weekly during 1994, 1995 and every two weeks from April 1997 through to December 2000 – are employed to assess the nitrogen flux across the summer thermocline of the Gulf of Aqaba. The flux calculations are based on a simple diffusion model that incorporates the physical stress eddy diffusivity factor Kz and a biological stress factor k. Both Kz and k are calculated using the Michaelis-Menten equation and the nitrate concentration gradient. The total nitrate flux of the Gulf of Aqaba during the seven summer months (May–November) is estimated at 0.52 moleN m−2. In relation to established primary productivity values (75.5 gC m−2 (May November)−1) and the generated chlorophyll a records, this yields an f fraction of new to total primary production of 0.50. This relatively high f value is discussed with respect to the geophysical characteristics of the Gulf of Aqaba and similar oceanic basins. The remaining 50% is accounted for by cross-sectional flow from the relatively nutrientrich coral reef coastal habitat and rapid recycling, triggered by high irradiance and water temperature.
Źródło:
Oceanologia; 2005, 47, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stratification of particulate organic carbon and nitrogen in the Gdańsk Deep (Southern Baltic Sea)
Autorzy:
Burska, D.
Pryputniewicz, D.
Falkowska, L.
Powiązania:
https://bibliotekanauki.pl/articles/47610.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
stratification
Gdansk Deep
nitrogen
particulate organic carbon
carbon
particulate organic nitrogen
flux
Baltic Sea
Opis:
Particulate organic carbon (POC) and nitrogen (PON) concentrations and fluxes were measured during an experiment in the Gdańsk Deep in late spring (30.05. –06.06.2001). The vertical POC and PON concentration profiles were characterised by the highest values in the euphotic layer,a gradual decrease with depth, and an increase below the halocline. The hydrophysical conditions had a decisive impact on POC and PON fluxes in the water column. Preferential removal of nitrogen from suspended mater was observed in the entire water column (maximum – in the vicinity of thermocline). There were also differences in the diurnal effectiveness of nitrogen removal as compared to carbon removal. The removal rate was highest at night.
Źródło:
Oceanologia; 2005, 47, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Values Preferred by Teachers and Students for Teacher Training Faculties
Autorzy:
Stanek, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/28765639.pdf
Data publikacji:
2005-12-31
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
value
teachers
axiology
social stratification
profession
teaching speciality
Opis:
In his article, the author outlines the values preferred by teachers and those aspiring to the profession. The presented data point to a very broad convergence between what teachers and students indicated with regard to their attitude towards values. Although one can observe certain, rather subtle, differences (related to, among others, the socio-demographic characteristics of those surveyed), they are of secondary importance and do not cause the axiological bases for the functioning of both groups to differ. What is significant is also the placement of such values as safety, responsibility and children. These values have a static character, connected with necessity and, at the same time, with the need to maintain one’s property. They proved to be slightly more appreciated by teachers than by students. The research shows one essential yet weak correlation: two values, wisdom and honesty, find a slightly wider acknowledgement among teachers than among their future colleagues. The same can be said of the case when the same values are chosen as primary. In this context, referring everything that takes place in the social space to distant, better times seems to be justified. No matter how it was in the real historical dimension, it appears justified to assert that it is undoubtedly better to live in an environment where the majority of those representing a given professional group (especially one as important for the social structure as teachers) recognise the importance of wisdom and honesty.
Źródło:
The New Educational Review; 2005, 7; 152-170
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie stratyfikacji w inwentaryzacji lasów różnowiekowych
Use of a stratification method in uneven-aged stands
Autorzy:
Banaś, J.
Powiązania:
https://bibliotekanauki.pl/articles/1022661.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
fazy rozwojowe
stratyfikacja drzewostanow
drzewostany roznowiekowe
lesnictwo
inwentaryzacja lasu
forest inventory
stratification
stand developmental phase
Opis:
The paper presents a posteriori stratification method which was used in inventorying uneven−aged stands in an area of 727.70 hectares in the Forest Experimental Station in Krynica. The average growing stock amounting to 291 m3·ha−1 was calculated with the error of 1.6%. Volume increment at the level of 9.39 m3·ha−1 per year was calculated with a similar accuracy as the growing stock. The loss volume of 5.33 m3·ha−1 and ingrowth volume 0.73 m3·ha−1 per year was determined with the error slightly above 5%.
Źródło:
Sylwan; 2005, 149, 12; 30-36
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Barriers of the Selection to Secondary and University-Level Education
Autorzy:
Domański, Henryk
Powiązania:
https://bibliotekanauki.pl/articles/1929420.pdf
Data publikacji:
2006-12-29
Wydawca:
Polskie Towarzystwo Socjologiczne
Tematy:
educational inequality
barriers of selection
social stratification
post-communist societies
Opis:
This paper analyses educational inequalities in Poland over the last two decades. Using data from national surveys carried out during the period 1982–2002 these results provide insight into the relationship between social origin and transition to secondary schools and university levels. Transition to both secondary school and universities are unquestionably selective by social class. The only question is whether these patterns have changed over the last two decades, when the communist regime collapsed and new inequalities emerged. Previous cross-time analyses for most countries showed a lack of substantial changes in educational inequalities over long periods of time. The main findings of the investigation can be summarised as follows. First, it showed that the effect of the class position of the father significantly increased in the 1990s, and then-until 2002-it declined to the degree of the 1980s, before the communist system collapsed. Second, in accordance with the findings of all previous studies, secondary school transition proved to be more selective as compared to that to the university level.
Źródło:
Polish Sociological Review; 2006, 156, 4; 471-488
1231-1413
2657-4276
Pojawia się w:
Polish Sociological Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 153

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