Wyniki wyszukiwania - Biblioteka Nauki

1

Perception of doping-related risks by junior and senior athletes

100%

Mroczkowska H.

Biomedical Human Kinetics

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2009

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tom 1

23-25

EN

Study aim: To assess the degree of acceptance of risk by experienced and inexperienced athletes. Material and methods: Two male teams participated in the study: juniors (football; n = 9) aged 16 - 18 years and seniors (volleyball; n = 13) aged 20 - 32 years. The subjects were requested to assess the doping-related risk of losing every of 6 values: health, medals, ranking position, physical attractiveness, psycho-emotional balance, bonuses and respect of personages, in three modes: importance of losing given value (scale 1 - 6), general likelihood of a doping-related loss of given value (scale 0 - 100) and the doping-related risk of losing given value the subject would be ready to take (scale 0 - 100).Results: Seniors and juniors rated the importance of individual values and the doping-related general likelihood of losing them alike. As compared with senior athletes, the junior ones significantly underrated the risk of losing health and respect and overrated that of possible bonus.Conclusions: The emotional, cognitive and social maturation of young athletes throughout a decade have an impact on perceiving doping-related risks and the associated decisions.

2

Effects of doping with CeO2 and calcination temperature on physicochemical properties of the NiO/Al2O3 system

100%

Shaheen W. , El-Hendawy A.

Open Chemistry

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2009

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tom 7

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nr 4

780-786

EN

The effects of doping with CeO2 and calcination temperature on the physicochemical properties of the NiO/Al2O3 system have been investigated using DTA, XRD, nitrogen adsorption measurements at −196°C and decomposition of H2O2 at 30–50°C. The pure and variously doped solids were subjected to heat treatment at 300, 400, 700, 900 and 1000°C. The results revealed that the specific surface areas increased with increasing calcination temperature from 300 to 400°C and with doping of the system with CeO2. The pure and variously doped solids calcined at 300 and 400°C consisted of poorly crystalline NiO dispersed on γ-Al2O3. Heating at 700°C resulted in formation of well crystalline NiO and γ-Al2O3 phases beside CeO2 for the doped solids. Crystalline NiAl2O4 phase was formed starting from 900°C. The degree of crystallinity of NiAl2O4 increased with increasing the calcination temperature from 900 to 1000°C. An opposite effect was observed upon doping with CeO2. The NiO/Al2O3 system calcined at 300 and 400°C has catalytic activity higher than individual NiO obtained at the same calcination temperatures. The catalytic activity of NiO/Al2O3 system increased, progressively, with increasing the amount of CeO2 dopant and decreased with increasing the calcination temperature.

3

O potřebě kritického čtení a hlubokého myšlení : umění polemického sporu

100%

Jirásek I.

Filosofický časopis (Philosophical Journal)

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2019

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tom 67

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nr 2

251-261

EN

The article rejects a discussion study that criticises argumentation concernng the theme of doping. A comparison of the published polemic and the original monograph, which was its target, reveals the following inadequacies in Vratislav Moudr’s approach: 1. he does not discern in a satisfactory way the distinctive ideas in the two texts and he draws conclusions from premises which he unnecessarily introduces into the texts, where the criticised ideas are not to be found; 2. he confuses legality with philosophical arguments when he turns from ethical inquiry to the official registration of selected substances; 3. he does not maintain sufficient distance between empirical reality and the approach of ideas to that reality, something that leads him to an inadequate stipulation of “one correct approach”; 4. he does not observe the canons of logic when distinguishing arguments and counter-arguments, and after a recapitulation of his critical opinion, he offers the very conclusions which are actually explicitly contained in the criticized text. On the basis of a large number of references to the published critique, I argue that Vratislav Moudr has not undertaken work of quality and integrity, and it is necessary to supplement his discussion study with an alternative understanding of the theme under discussion.

DE

Im vorliegenden Beitrag wird die Diskussionsstudie mit der Kritik an der Argumentation zum Thema Doping kritisch hinterfragt. Anhand des Vergleichs der publizierten Polemik und der ihr zu Grunde liegenden Monographie ergeben sich folgende inadäquate Ansätze und Vorgehensweisen Vratislav Moudrs: 1. Moudr unterscheidet die ideelle Schnittstelle zwischen zwei Texten nicht ausreichend und zieht seine Schlussfolgerungen aus Prämissen, die er Texten zuordnet, in denen die kritisierten Aussagen nicht vorhanden sind; 2. die philosophische Argumentation verwechselt er mit der Legalität, indem er die ethische Fragestellung durch eine Aufzählung ausgewählter Stoffe ersetzt; 3. er wahrt keinen ausreichenden Abstand zwischen empirischer Realität und diesbezüglichem Denkansatz, woraus sich die inadäquate Festlegung einer „einzig richtigen Problemlösung“ ergibt; 4. er verfolgt keine feste logische Struktur von Argument und Gegenargument und gelangt nach der Rekapitulation der kritischen Ansichten zu Schlussfolgerungen, die freilich ausdrücklich in dem von ihm kritisierten Text aufgeführt sind. Auf Grundlage der gesammelten Verweise auf die publizierte Kritik bin ich der Meinung, dass Vratislav Moudr hier keine saubere Arbeit geleistet hat, und dass die Diskussionsstudie durch ein alternatives Verständnis des zur Diskussion stehenden Themas ergänzt werden muss.

4

Stabilization Studies of Crystal Structure of Optimally Th-Doped Lead Zirconate Perovskite

88%

Elsabawy K. M. , El-Hawary W. F.

World Scientific News

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2016

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tom 33

56-66

EN

The optimally thorium-doped Pb0.9Th0.1ZrO3 was selected for studying thorium doping effect on the structural parameters of lead zirconate crystal. The investigations were made on the low concentrations range of thorium doping 0.0 ≤ x ≤ 0.25 mole. The present investigations are concerned by confirming that thorium dopings play an important role as stabilizing agent inside internal structure of crystal lattice of Pb1-xThxZrO3 where x = 0.1 mole. XRD-measurements indicated that Thorium dopant substitutes successfully on the A-sites of lead zirconate without damaging the main crystal structure at x = 0.1 mole. Visualization and theoretical investigations were concerned by matching and comparison of bond distances ,torsions on angles of investigated compound to clarify success of thorium doping on the perovskite structure.

5

Gas-phase synthesis of inorganic fullerene-like structures and inorganic nanotubes

75%

Deepak F. , Tenne R.

Open Chemistry

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2008

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tom 6

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nr 3

373-389

EN

Following the discovery of fullerenes (C60) and carbon nanotubes, it was shown that nanoparticles of inorganic layered compounds, like WS2 and MoS2, are unstable in the planar form and they form closed cage structures with polyhedral or nanotubular shapes. Although initially the method of synthesis for the formation of such closed caged structures and nanotubes involved starting from the respective oxides, it is now well established that the gas-phase synthetic route (using metal chlorides, carbonyls etc) provides an alternative which is suitable for the synthesis of very many closed caged structures and nanotubes hitherto unknown. Various issues with this method of synthesis, including its fundamentals, mechanism, and the properties of the inorganic fullerene-like structures produced are reviewed, together with some possible applications. [...]

6

An overview of current research trends on graphene and it’s applications

63%

Krishna R. S. , Mishra J. , Das S. K. , Mustakim S. M.

World Scientific News

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2019

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tom 132

206-219

EN

Graphene is no doubt called a wonder-material due to its outstanding superlative traits. It has its application near about in every field. Its properties are extraordinary and different from any day-to-day material. Albeit bearing such qualities, its structure is rather simple than most individuals cerebrate of. It has a thickness of an atom. It is a two-dimensional carbon arranged in a honeycomb crystal structure. It could transmute the way we view, in numerous fields of science. Its applications can be an asset to a greener environment for which Graphene engineered cement/concrete composites have an immense potential in the present times when sustainable construction materials are the need of the hour. Graphene can act as a good adsorbent for pollutant abstraction due to its high surface area. Either alone or in coalescence with different materials, it very well may be used for the debasement or deliberation of a sizably voluminous assortment of contaminants through a few strategies. Incipient heights can be achieved as the list of operations for graphene is virtually illimitable. Utilization of graphene in the coming years will give inundating difference to current technologies. This paper fixates on the applications and developments of Graphene in fields like Electronics, Batteries, Filtration, Medicine, Construction, and Composites.