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Content available remote Superhumps in V1141 Aquilae
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EN
Results of the CCD observations of the 2002 superoutburst of V1141 Aql are described. We have detected clear superhumps characterized by the period of 0.05930(5) days, which clearly indicates that the star is a member of SU UMa class of dwarf novae.
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Content available remote Nova V1974 Cyg - Results of the 1997 Campaign
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EN
This report analyzes the I-band CCD photometry of Nova V1974 Cyg from the 1997 observational season. The analysis shows that both short-term modulations with periods of 0.0813 and 0.085 days are still present in the light curve of the star. We confirmed the stability of the shorter period which is interpreted as the orbital period of the binary system. Its value, determined using the O-C residuals, is Porb=0.08125873(23) days=117.0126(3) min. The longer period, which appeared in the light curve in 1994, was decreasing until the beginning of 1995 but then started to increase quite rapidly. In October 1996 the value of the period was 122.67±0.02 min. Until the next observing run the period significantly decreased. Its value, as determined from our observations performed in July 1997, was 121.87±0.12 min. This means that the rate of change of the period in 1996-1997 was as high as P≈10-6. Such a rapid change of the period requires a large amount of rotational kinetic energy, if we assume that a 122-min periodicity is the rotation period of a white dwarf. Thus the more probable explanation is the hypothesis that the longer period including a superhump period is caused by the precession of an accretion disc surrounding a white dwarf primary.
EN
The classic theory of knowledge is a theory of cognition concerning itself with propositions and concepts conceived either psychologically or logically. A semantically interpreted theory of cognition is a theory dealing with sentences and other verbal expressions. The author compares these two approaches and asks the question: When is it legitimate to transform a classic theory of knowledge into a semantic theory of knowledge? Or, to put the same problem in a different language: When is it legitimate to abandon logically or psychologically interpreted utterances and replace them with sentences and other linguistically interpreted expressions? Such replacement is tempting because propositions and notions lead to numerous, mostly insoluble, controversies, whereas syntactic and semantic formulations are by and large uncontroversial. It must be conceded, however, that such a replacement is not advisable before it has been shown on what conditions it can be executed without losing legitimacy.
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Content available Glin w lekach
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Content available Ocena wartości odżywczej posiłków przedszkolnych
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PL
Żywienie jest jednym z najważniejszych czynników warunkujących prawidłowy wzrost i rozwój dzieci. W żywieniu przedszkolnym powinno być realizowane 75% całodziennej racji pokarmowej. Celem pracy była ocena wartości energetycznej i odżywczej posiłków serwowanych w stołówce przedszkolnej na podstawie teoretycznej analizy jadłospisów z zastosowaniem programu komputerowego Dieta 4D. Obliczono wartość energetyczną, zawartość: białka, tłuszczu, węglowodanów; witamin A, C, B12 oraz składników mineralnych: Ca i Fe, dla 40 całodziennych jadłospisów przedszkolnych z czterech pór roku: wiosny, lata, jesieni i zimy. Średnia wartość energetyczna racji kształtowała się na prawidłowym poziomie. Powyżej normy w badanych racjach pokarmowych kształtowała się zawartość witaminy A i witaminy B12. W badanych racjach pokarmowych uwidoczniły się nieprawidłowości związane ze zbyt niską w stosunku do norm zawartością wapnia, żelaza i witaminy C. Sugeruje to konieczność edukacji pracowników przedszkola w zakresie prawidłowego żywienia dzieci.
EN
Nutrition is one of the most important factors assuring normal growth and development of children. Kindergarten`s meals should realise 75% of recommended daily allowances. The aim of this study was the energetic and nutritional evaluation of meals served in the kindergarten based on theoretical analysis of the menus using the Diet 4D computer program. The energy values, contents of protein, fat, carbohydrates, vitamins: A, C, B12, mineral ingredients: Ca, Fe were calculated for forty kindergarten menus of four seasons: spring, summer, autumn and winter. The average caloric value of a food ration was at a correct level. High dietary content of vitamin A and B12 was found. The deficient intake in relation to the standards was observed for calcium, iron and vitamin C. The results indicate the need for nutritional education for the kindergarten staff.
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Content available remote Hot Spot Manifestation in Eclipsing Dwarf Nova HT Cassiopeiae
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EN
We report the detection of a hot spot in the light curves of the eclipsing dwarf nova HT Cas during its superoutburst in 2010 November. Analysis of the eight reconstructed light curves of the hot spot eclipses showed directly that the brightness of the hot spot was changing significantly during the superoutburst. Thereby, detected hot spot manifestation in HT Cas is the newest observational evidence for the EMT model for dwarf novae.
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EN
We present the analysis of hot spot brightness in light curves of the eclipsing dwarf nova IY UMa during its normal outburst in March 2013 and in quiescence in April 2012 and in October 2015. Examination of four reconstructed light curves of the hot spot eclipses showed directly that the brightness of the hot spot changed significantly only during the outburst. The brightness of the hot spot, before and after the outburst, was on the same level. Thus, based on the behavior of the hot spot, IY UMa during its normal outburst follows the disk-instability model.
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Content available remote Curious Variables Experiment (CURVE). Three Periodicities of BF Ara
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EN
We report CCD photometry of the dwarf nova BF Ara in quiescence carried out throughout fifteen consecutive nights. Light curve in this interval is dominated by a large amplitude (≈0.8 mag), two period modulations. Higher amplitude signal has a period of 0.082159(4) days, which was increasing at the rate of P/Psh=3.8(3)×10-5. Weaker and stable second signal has a period of 0.084176(21) days. Because the superhump period of BF Ara is equal to 0.08797(1) days, the first modulation is interpreted as quiescent negative superhump arising from retrograde precession of titled accretion disk and the latter one as the orbital period of the binary. The respective period excess and defect are ε=4.51%±0.03% and ε-=-2.44%±0.02%. Thus BF Ara is yet another in-the-gap nova with mass ratio of q≈0.21.
PL
Ewolucja populacji ludzi na Ziemi - licząc od 10 tysięcy lat przed naszą erą - pokazuje, że w ciągu ostatnich 50 lat nastąpił okres szybkiego wzrostu zaludnienia. W tym czasie ludność świata zwiększyła się o tyle ile wynosił jej wzrost w czasie 2,5 min lat dzielących nas od homo erectus. Szacunki liczby ludności świata w 2050 r. wahają się od 7,8 mld do 12,5 mld. Wzrost ludzkiej populacji niesie ze sobą konieczność rozwiązywania problemów cywilizacyjnych, a w tym i jednego z najważniejszych, związanego z zachowaniem godności do właściwego pochówku.
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Content available remote The 2003 and 2005 Superhumps in V1113 Cygni
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EN
We report CCD photometry of the cataclysmic variable star V1113 Cyg. During two campaigns, lasting from May to August 2003 and from March to June 2005, we recorded two superoutbursts. In the obtained light curves we detected clear superhumps with a mean period Psh=0.07891(3) days (113.63±0.04 min). That fact confirms that the star is a member of SU UMa class of dwarf novae. During the first observed superoutburst the superhump period was decreasing with an enormous rate of P=-4.5(8)×10-4 which is one of the highest values ever observed in SU UMa systems.
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EN
Results of the CCD observations of CzeV404 are presented. During the season of June-August 2014 we detected one outburst and one superoutburst of the star. Clear superhumps with the period of Psh=0.10472(2) days were observed. The superhump period was decreasing with a high value of dP/dt=-2.43(8)×10-4. From 17 eclipses we calculated the orbital period with the value of Porb=0.0980203(6) days which confirms that CzeV404 belongs to period gap objects and it is the longest orbital period of an eclipsing SU UMa star. Based on superhump and orbital period determinations, the period excess ε=6.8%±0.02% and the mass ratio q≈0.32; of the system were obtained.
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