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7672. Elementární částice vydávají další tajemství
- Creator:
- Jiří Grygar
- Format:
- print, text, regular print, bez média, and svazek
- Type:
- model:article and TEXT
- Subject:
- elementární částice, particles (nuclear physics), 12, and 00
- Language:
- Czech
- Description:
- Jiří Grygar.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
7673. Elementární model tuhnutí vosku: Gymnaziální studentský projekt
- Creator:
- Rezková, Karolína and Musilová, Jana
- Format:
- print, bez média, and svazek
- Type:
- model:article and TEXT
- Subject:
- fyzika, studentské projekty, physics, student research projects, 6, and 53
- Language:
- Czech
- Description:
- The first author, a high-school student, together with the second author, a project supervisor, presents a simple model of the solidification of liquid wax poured into a cylindrical vessel. The results obtained with the model are tested in a series of experiments carried out inside cylindrical containers of different dimensions. There is a good agreement achieved between theory and experiment. The main goal of this project is to identify and investigate a physical phenomenon which would test and enhance students‘ creativity., Karolína Rezková, Jana Musilová., and Obsahuje seznam literatury
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
7674. Elements of a theory of nonphysical agents in the physical world
- Creator:
- Meixner, Uwe
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- brain, chance, choice, consciousness, determinism, Domindar, indeterminism, nonphysical cause, quantum physics, principle of causal closure, principle of sufficient cause, subject of consciousness and of physical action, mozek, šance, výběr, vědomí, determinismus, indeterminismus, nefyzikální příčina, kvantová fyzika, zásada kauzálního uzavření, dostatečná příčina, and subjektem vědomí a fyzického jednání.
- Language:
- Slovak
- Description:
- This paper shows that there is a quantum-physical and evolution-biological perspective for (libertarian) free will, and that the so-called scientific arguments against it are in reality metaphysical arguments and insufficient. The paper also develops the idea of a nonphysical organ of higher organisms: the Domindar (Detector of macroscopic indetermination, and restrictor)., Tento článek ukazuje, že existuje kvantově-fyzikální a evolučně-biologická perspektiva pro (libertariánskou) svobodnou vůli a že tzv. Vědecké argumenty proti ní jsou ve skutečnosti metafyzické argumenty a nedostatečné. Příspěvek také rozvíjí myšlenku nefyzického orgánu vyšších organismů: Domindara (detektor makroskopické neurčitosti a omezovače)., and Uwe Meixner
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
7675. Elementy skamandryckie w poezji Jerzego Lieberta
- Creator:
- Pająk, Aleksandra
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- literary science, text analysis, and Polish poetry
- Language:
- Czech
- Description:
- Jerzy Liebert was a poet creating his literary work during the interwar period (1904-1931). Initially, he was influenced by romantic comprehending of the world, later he moved towards metaphysical lyric poetry. The present text is aimed at showing the relationship between Liebert´s literary work and the poetry of the Samander literary group which characteristic features, among other things, are: presentism (comprehended as relationship with the present time), vitalism, pacifism, universalism, and urbanism. At the topic level it is seen when Liebert reaches for the elements of biologism or for the cult of spontaneity, and when he calls on the motiv of wine or drunkenness. It is also possible to point at the kinship of Liebert with the Skamander´s "big five" in the sphere of versification. Altough the poet set him free from the influence of the Skamander group about 1926, it can be stated that it was an important period in the evolution of his poetry.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
7676. Elementy současné vědy v úlohách fyzikální olympiády
- Creator:
- Volf, Ivo and Vybíral, Bohumil
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- fyzikální věda, středoškolská výuka, mezinárodní fyzikální olympiády, physical science, high school education, and international physics olympiads
- Language:
- Czech
- Description:
- V článku se zabýváme problémy spojenými s uplatňováním elementů současné fyzikální vědy v úlohách. U teoretických úloh jde především o skutečnost, že středoškolští řešitelé mnohdy neznají potřebné fyzikální i matematické vztahy a ty se musí v zadání uvést. U experimentálních úloh jsou organizátoři omezení velkým počtem aparatur, které musí postavit. Proto se uplatňují úlohy, kdy si řešitel musí umět poradit s omezenými prostředky. Ve druhé části příspěvku je na devatenácti příkladech uvedeno, jak se daří organizátorům uplatňovat současnou vědu v úlohách mezinárodních fyzikálních olympiád., Ivo Volf, Bohumil Vybíral., and Obsahuje seznam literatury
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
7677. Elena Todorova, Bălgarskite săjuzi v publističen tekst
- Creator:
- Uhlířová, Ludmila
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Language:
- Czech
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
7678. Elevated CO2 and temperature differentially affect photosynthesis and resource allocation in flag and penultimate leaves of wheat
- Creator:
- Pérez, P., Zita, G., Morcuende, R., and Martínez-Carrasco, R.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- acclimation, ribulose-1,5-bisphosphate carboxylase, oxygenase, temperature, and Triticum aestivum
- Language:
- Multiple languages
- Description:
- Differences in acclimation to elevated growth CO2 (700 µmol mol-1, EC) and elevated temperature (ambient +4 °C, ET) in successive leaves of wheat were investigated in field chambers. At a common measurement CO2, EC increased photosynthesis and the quantum yield of electron transport (Φ) early on in the growth of penultimate leaves, and later decreased them. In contrast, EC did not change photosynthesis, and increased Φ at later growth stages in the flag leaf. Contents of chlorophyll (Chl), ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPCO), and total soluble protein were initially higher and subsequently lower in penultimate than flag leaves. EC decreased RuBPCO protein content relative to soluble protein and Chl contents throughout the development of penultimate leaves. On the other hand, EC initially increased the RuBPCO:Chl and Chl a/b ratios, but later decreased them in flag leaves. In the flag leaves but not in the penultimate leaves, ET initially decreased initial and specific RuBPCO activities at ambient CO2 (AC) and increased them at EC. Late in leaf growth, ET decreased Chl contents under AC in both kinds of leaves, and had no effect or a positive one under EC. Thus the differences between the two kinds of leaves were due to resource availability, and to EC-increased allocation of resources to photon harvesting in the penultimate leaves, but to increased allocation to carboxylation early on in growth, and to light harvesting subsequently, in the flag leaves. and P. Pérez ... [et al.].
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
7679. Elevated CO2 concentration enhances the role of the ear to the flag leaf in determining grain yield of wheat
- Creator:
- Zhu, C.-W., Zhu, J.-G., Liu, G., Zeng, Q., Xie, Z.-B., Pang, J., Feng, Z.-Z., Tang, H.-Y., and Wang, L.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- net photosynthetic rate and Triticum aestivum
- Language:
- Multiple languages
- Description:
- Net photosynthetic rate (PN) of ear and flag leaf during grain filling stage and grain yield of plants with non-darkened or darkened flag leaf or darkened ear were examined in two different CO2 concentrations: ambient (AC) and AC+200 µmol mol-1 (EC). Ear showed much higher enhancement (56 %) of PN than flag leaf (23 %) under EC. Moreover, CO2 enrichment shortened the photosynthetic duration of flag leaf relative to ear. In this way the ratio of ear to flag leaf contribution to grain yield increased from 1.18 (AC) to 1.39 (EC). and C.-W. Zhu ... [et al.].
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
7680. Elevated CO2 increased photosynthesis and yield without decreasing stomatal conductance in broomcorn millet
- Creator:
- Hao, X. Y., Li, P., Li, H. Y., Zong, Y. Z., Zhang, B., Zhao, J. Z., and Han, Y. H.
- Format:
- print, bez média, and svazek
- Type:
- model:article and TEXT
- Subject:
- fluorescence chlorofylu, výměna plynu, obohacování o CO2, efektivita využívání vody, proso seté, chlorophyll fluorescence, CO2 enrichment, gas exchange, water-use efficiency, 2, and 581
- Language:
- Multiple languages
- Description:
- Broomcorn millet (Panicum miliaceum L.) is one of the important C4 crops in the semiarid regions of northern China. It is a close relative of biofuel crop switchgrass. Yet, there is no information on how these crops might respond to a climate change in China. In order to gain insight into such a response, we studied the effect of elevated CO2 concentration (EC) on broomcorn millet. The changes in leaf photosynthesis, chlorophyll fluorescence, morphological parameters, biomass and yield in response to EC [i.e., + 200 µmol(CO2) mol-1] over two years were determined at the open-top chamber (OTC) experimental facility in north China. EC increased net photosynthetic rate, stomatal conductance, intercellular CO2 concentration, transpiration rate, instantaneous transpiration efficiency, effective quantum yield of PSII photochemistry, and photochemical quenching coefficient of fully expanded flag leaves. Maximal quantum yield of PSII photochemistry declined under EC in 2013, but was not affected in 2014. EC significantly decreased intrinsic efficiency of PSII in 2013, but increased in 2014. Leaf nonphotochemical quenching decreased under EC both in 2013 and 2014. EC significantly enhanced the aboveground biomass and yield by average of 31.4 and 25.5% in both years, respectively. The increased yield of broomcorn millet under EC occurred due to the enhanced number of grains per plant. We concluded that photosynthesis of broomcorn millets was improved through increased stomatal conductance in leaves under EC, which led to an increase in height, stem diameter, aboveground biomass, and yield. This study extends our understanding of the response of this ancient C4 crop to elevated CO2 concentration., X. Y. Hao, P. Li, H. Y. Li, Y. Z. Zong, B. Zhang, J. Z. Zhao, Y. H. Han., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public