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Tytuł:
KIERKEGAARD AND THE CONCEPT OF NEGATIVE DIALECTICS OF THEODOR ADORNO
Autorzy:
Krawerenda-Wajda, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/647184.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
Kierkegaard
Adorno
dialectic
synthesis
mind
Opis:
The main subject of this paper is the influence of Kierkegaard's philosophy on the concept of Adorno's dialectics. This article is focused on the analysis of Adorno's work published in 1966 titled Negative Dialec-tics. Adomo 's concept of dialectics, which is based on undefined experience, is broadly similar to the "negative" concept of existential philosophy of Kierkegaard. Although Adomo uses the Hegelian dialectics to expose the ways in which Kierkegaard’s thoughts fali into idealism. Finally, Adomo adopts Kierkegaard’s criticism of Hegelian identity of thinking. Adomo, in Negative Dialectics refers to Kant, Hegel Heidegger, but seldom to Kierkegaard. A careful analysis shows that a number of themes and concepts of its predecessor have been assimilated to his philosophy.
Źródło:
Studia Humanistyczne AGH; 2012, 11, 3
2084-3364
Pojawia się w:
Studia Humanistyczne AGH
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dialektyka i synteza. O Pascalowskiej filozofii człowieka
Autorzy:
Błaszczyk, Marek
Powiązania:
https://bibliotekanauki.pl/articles/631051.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
individual existence
paradox
dialectics
synthesis
Opis:
The study focuses on the characteristically Pascalian attempt at synthesizing of contradictory and intensely remote extremes of existence. Assuming the form of existential dialectics, the paradox of Pascalian vision refers in particular to the human, demonstrating the non-reducible tension between the intuitive (irrational) and the rational (panlogical); between the heart and the mind, between faith and knowledge. The conviction of human misery or the worldly vanity is fused here with the simultaneous sense of human greatness (the power of thought). The tension which therefore spans those dichotomous ontological-ontic dimensions is the determining factor of the constitution of individual existence.
Źródło:
Studia Europaea Gnesnensia; 2015, 11; 83-96
2082-5951
Pojawia się w:
Studia Europaea Gnesnensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Synthetic Methods for 4,4’,5,5’-Tetranitro-2,2’-bi- 1H-imidazole (TNBI)
Autorzy:
Szala, M.
Lewczuk, R.
Powiązania:
https://bibliotekanauki.pl/articles/358154.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
tetranitrobiimidazole
nitration
synthesis
explosive properties
Opis:
Four new nitration methods for the synthesis of 4,4’,5,5’-tetranitro-2,2’- bi-1H-imidazole (TNBI) were examined. TNBI was synthesized by nitration of 2,2’-bi-imidazole (BI) with the following mixtures: (CH3CO)2O/HNO3, (CF3CO)2O/ HNO3, P4O10/HNO3 and H3PO4/P4O10/HNO3. Nitration of BI with a mixture of nitric acid and acetic anhydride leads to 4,4’-dinitro-bi-imidazole. The other nitrating conditions investigated gave TNBI in lower yields (6.0-22.4%). Crystallization of crude TNBI from wet ethanol/acetone gave TNBI as its dihydrate. The structures of BI and TNBI were characterized by 1H, 13C and 15N NMR spectroscopy and elemental analysis. Friction and impact sensitivity, detonability and detonation velocity were determined for pure TNBI dihydrate.
Źródło:
Central European Journal of Energetic Materials; 2015, 12, 2; 261-270
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chitosan derivatives - synthesis and characterization
Autorzy:
Szulc, Marta
Lewandowska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1844946.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
chitosan
synthesis
characterization
synteza
charakterystyka
Źródło:
Engineering of Biomaterials; 2020, 23, 158 spec. iss.; 11
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of PVA Polymer Type and Calcination Temperature on Synthesis of Nanocrystalline Yttria Powder by Polymer Solution Route
Autorzy:
Yang, Y.-K.
Lee, S.-J.
Powiązania:
https://bibliotekanauki.pl/articles/356024.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
yttria
PVA
nanocrystalline
synthesis
nanowire
Opis:
Nano-sized yttria (Y2O3) powders were synthesized by a polymer solution route using polyvinyl alcohol (PVA) as an organic carrier. The PVA polymer affected the dispersion of yttrium ions in precursor sol. In this study, three kinds of PVA polymer (different molecular weight) were applied for synthesis of yttria powder. The PVA type as well as calcination temperature had a strongly influence on the particle morphology. Single crystal nano wire particles were observed at the temperature of polymer burn out range and the size was dependent on the PVA type. The stable, fully crystallized yttria powder was obtained through the calcination at 800°C for 1 h. The yttria powder prepared with the high weight PVA (MW: 153,000) revealed a particle size of 30 nm with a surface area of 18.8 m2/g.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 3; 1473-1476
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review of Nano-thermites: a Pathway to Enhanced Energetic Materials
Autorzy:
Zaky, Mohamed Gaber
Elbeih, Ahmed
Elshenawy, Tamer
Powiązania:
https://bibliotekanauki.pl/articles/27787860.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
energetic materials
nanothermite
synthesis
applications
Opis:
Nano-thermites or metastable intermolecular composites (MICs) have been implemented into modern research on energetic materials as they offer much higher energy densities, higher rates of energy release, stability, and safety (lower sensitivity). This paper reviews several synthetic methods for MICs that have been well thought-out for energetic applications, advantages and disadvantages, as well as the characteristics of each manufacturing technique. The techniques presented include powder mixing, sol-gel, synthesis of MICs based on nano-porous silicon (Psi), sputtering, multilayer nano-foils and electrolytically plated carbon nano-materials for nano-thermite applications. These techniques offer enormously different characteristics and, through the variation of various chemical techniques and conditions, a wide range of chemical and energetic properties may be attained. This may give the opportunity for the safe use of MICs as replacements for some conventional energetic materials in various applications, and may also enable us to study the effects when incorporating these MICs into energetic matrixes, as a promising and feasible research field.
Źródło:
Central European Journal of Energetic Materials; 2021, 18, 1; 63--85
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Homogenization and Micro/Nano Source of Starting Powders on Format Ion of the Single YAP Phase
Autorzy:
Michalik, D.
Pawlik, T.
Plewa, J.
Sopicka-Lizer, M.
Powiązania:
https://bibliotekanauki.pl/articles/351720.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
YAP
scintillators
synthesis
polycrystalline ceramics
Opis:
Manufacturing high purity polycrystalline YAlO3 (YAP) ceramics could replace monocrystalline YAP thus recently it is an interesting task for low cost producers of scintillators. The paper presents influence of different source of initial oxide powders (micro/nano powders of Y2O3 and Al2O3) and the method of their homogenization on the formation of a YAP phase. The solid state reaction method was used to prepare YAP powder or ceramic pellets. After preheating, all samples in the form of powders and pellets were heat-treated in the temperature range of 1050-1650 °C. DTA method was applied for examination of the phase crystallization in the tested system. X-ray diffraction method (XRD) was used for characterization of the phase composition. X-ray microanalysis (EDS) was used to control homogeneity in the small areas. Morphology of the resultant samples are presented on SEM pictures. The results show a significant influence of the starting powders on the homogeneity, purity and temperature of formation of the main phase.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 1753-1760
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ostatnie postępy w syntezie alkaloidów tropanowych i pochodnych tropanu
Recent advances in the synthesis of tropane alkaloids and other tropane derivatives
Autorzy:
Sidorowicz, K.
Kropiwnicki, K.
Łaźny, R.
Powiązania:
https://bibliotekanauki.pl/articles/171941.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
synteza
alkaloidy tropanowe
pochodne tropanów
synteza stereoselektywna
synthesis
tropane alkaloids
tropane derivatives
stereoselective synthesis
Opis:
Tropane alkaloids are a long-known class of compounds possessing an 8-azabicyclo[ 3.2.1]octane skeleton. Many tropane alkaloids posses biological activity (anticholinergic, anti-Parkinsonian, hypotensive), and as such had a significant influence on medicine and played a notable role in the development of organic chemistry [1]. The most known representatives of biologically active tropane alkaloids are: cocaine, atropine, scopolamine, ecgonine, and Bao Gong Teng A. A number of natural tropane alkaloids are chiral compounds, whose preparation in optically active forms is still a big challeng [2]. The biological activity of enantiomers often differs depending on their configurations. Alkaloids are a subject of an intensive research: scopus database contains nearly 200 thousand publications with the word „alkaloid”, and almost 4,500 publications with the phrase „tropane alkaloids” (about half of them have appeared in the last ten years). About 55 papers are devoted to stereoselective synthesis of tropane derivatives in 2000-2015. About half of this concernes stereoselective methods. The organic synthesis of alkaloids has a long history and numerous synthetic approaches to the tropane skeleton have been developed, from the classical synthesis of tropinone by Willstätter at the beginning of the XX century, to more recent developments dealing with asymmetric deprotonation of tropinone with chiral lithium amide bases for the enantioselective synthesis of a range of tropanes [3, 4]. Owing to extensiveness of the field, the current review presents the most interesting, from a synthetic point of view, approaches to tropane derivatives and tropane analogues. Most of the methods of synthesis are long (often several steps), time- and recourses-intensive, and often required elaborate and hardly available starting materials. But there are also notable exceptions, based on the asymmetric deprotonation approach; e.g., from the syntheses of cocaine described in this article, the most efficient one was reported by Lee in 2000 [5]. The concise synthesis (6 steps) gave the unnatural enantiomer of cocaine starting from commercially available tropinone in 78% overall yield. This approach allows to obtain both enantiomers and racemate, by changing type of one reactant only. However, most strategies provide only one enantiomer or racemic mixture of an alkaloid. As can be seen, despite of advances in chemicall science, there is no general way to synthesize majority of the representatives of this group of structurally related compounds.
Źródło:
Wiadomości Chemiczne; 2015, 69, 11-12; 1019-1045
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
1-fenylo-2,6-bis(etoksykarbonylometylo)imidazo[1,5-c]-chinazolino-3,5-dion : półprodukt w syntezie poliuretanów
1-phenyl-2,6-bis(ethoxycarbonylmethyl)imidazo[1,5-c]-quinazoline-3,5-dione : an intermediate product in synthesis of polyurethanes
Autorzy:
Hęclik, K.
Szyszkowska, A.
Zarzyka, I.
Powiązania:
https://bibliotekanauki.pl/articles/278346.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Inżynierii Materiałów Polimerowych i Barwników
Tematy:
poliuretany
synteza
imidazochinazolin
polyurethanes
synthesis
imidazoqinazolin
Opis:
W niniejszej pracy podjęto badania w celu wyjaśnienia struktury krystalograficznej 2,6-bis(etoksykarbonylometylo)-1-fenyloimidazo[1,5-c]chinazolino-3,5-dionu (BEFIC). Związek ten jest półproduktem w syntezie poliuretanów liniowych z pierścieniem imidazochinazolinowym. Monokryształ BEFIC tworzy tylko jedna para enancjomerów z pośród 32 możliwych konformerów. Obliczenia kwantowo-mechaniczne cząsteczki BEFIC przeprowadzone w oparciu o Teorię Funkcjonału Gęstości (DFT) z użyciem programu Gaussian wykazały możliwość wzajemnej przemiany konformerów tego związku. Transformacja konformerów BEFIC prowadzi ostatecznie do występowania tylko jednej, najbardziej stabilnej pary enancjomerów, pozwalającej na najlepsze upakowanie cząsteczek w komórce elementarnej.
In the present work, we have undertaken research in order to clarify the crystal structure of 2,6-bis(ethoxycarbonylmethyl)-1-phenylimidazo[1,5-c]quinazoline-3,5-dione. This compound is an intermediate in the synthesis of the linear polyurethanes with imidazoquinazoline ring. Single crystal of 2,6-bis(ethoxycarbonylmethyl)-1-phenylimidazo[1,5-c]quinazoline-3,5-dione is formed by only one pair of enantiomers from among 32 possible conformers. Quantummechanical calculations 2,6-bis(ethoxycarbonylmethyl)-1-phenylimidazo[1,5-c]quinazoline-3,5-dione carried out based on the density functional theory (DFT) using the program Gaussian demonstrated the possibility of the mutual transformations of the conformers. Transformation of 2,6-bis(ethoxycarbonylmethyl)-1-phenylimidazo[1,5-c]quinazoline-3,5-dione conformers ultimately leads to the presence of only one pair of enantiomers. This pair is the most stable and allows the best packing of molecules in the unit cell.
Źródło:
Przetwórstwo Tworzyw; 2017, T. 23, Nr 1 (175), 1 (175); 24-32
1429-0472
Pojawia się w:
Przetwórstwo Tworzyw
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, Characterization and Compatibility Studies of Poly(DFAMO/NIMMO) with Propellant and PBX Ingredients
Autorzy:
Li, H.
Yang, Y.
Pan, J.
Wang, W.
Pan, R.
Zhu, W.
Powiązania:
https://bibliotekanauki.pl/articles/358094.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
energetic binder
synthesis
characterization
compatibility
PDN
Opis:
Oxetane-based polymers substituted with difluoroamino groups can be used as energetic binders in propellants and polymer-bonded explosives (PBXs). As a novel candidate, poly(3-difluoroaminomethyl-3-methyloxetane/3-nitratomethyl-3-methyloxetane) (PDN) was synthesized and its structure was established. Thermogravimetry (TG) and differential scanning calorimetry (DSC) were employed to investigate its thermal decomposition behaviour. The compatibility between PDN and some common ingredients of propellants and PBXs was evaluated by the DSC method. PDN with good thermal stability was synthesized via a cationic solution polymerization process. Additionally, it has improved compatibility with cyclotetramethylenetetranitramine (HMX), carbon black (C.B.) and lead carbonate (PbCO3) compared with homopoly(3-difluoroaminomethyl-3-methyloxetane) (PDFAMO). PDN could be used as a promising difluoroamino energetic binder in the future.
Źródło:
Central European Journal of Energetic Materials; 2018, 15, 1; 85-99
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, COX-1/2 inhibition and antioxidant activities of new oxicam analogues designed as potential chemopreventive agents
Autorzy:
Szczęśniak-Sięga, Berenika
Gębczak, Katarzyna
Gębarowski, Tomasz
Maniewska, Jadwiga
Powiązania:
https://bibliotekanauki.pl/articles/1038390.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
synthesis
chemoprevention
antioxidant
COX
NSAIDs
oxicams
Opis:
Oxicams (e.g. piroxicam, meloxicam) are widely used nonsteroidal anti-inflammatory drugs (NSAIDs). A large body of evidence from epidemiological and preclinical studies has shown that NSAIDs have a chemopreventive effect on different types of cancer, especially in colorectal cancer. Moreover, mounting evidence from preclinical and clinical studies suggests that persistent inflammation functions as a driving force in the journey to cancer. What is more, inflammation induces reactive oxygen and nitrogen species, which cause damage to important cellular components (e.g., DNA, proteins and lipids), which can directly or indirectly contribute to malignant cell transformation. In this study, we discuss the synthesis and the resultant newly synthesized oxicam derivatives which are potentially chemopreventive, and at the same time antioxidant. Compound 9c, with the highest therapeutic index in the LoVo cancer cell line, was found to be the most efficient in ROS scavenging activity under conditions of oxidative stress.
Źródło:
Acta Biochimica Polonica; 2018, 65, 2; 199-207
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chitosan derivatives - synthesis and characterization
Autorzy:
Szulc, Marta
Lewandowska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1844877.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
chitosan
synthesis
characterization
chitozan
synteza
charakterystyka
Źródło:
Engineering of Biomaterials; 2020, 23, 158 spec. iss.; 11
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of saccharides on pullulan synthesis by Aureobasidium pullulans A.p.-3
Autorzy:
Gniewosz, M.
Sobczak, E.
Powiązania:
https://bibliotekanauki.pl/articles/1371461.pdf
Data publikacji:
1992
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
pullulan
Aureobasidium pullulans
saccharide
synthesis
biosynthesis
Źródło:
Polish Journal of Food and Nutrition Sciences; 1992, 01, 4; 37-43
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pisanie „pomiędzy”. O prozie Anny Kańtoch
Writing “In-Between”. On Anna Kańtoch’s Prose
Autorzy:
Czaja, Kamila
Powiązania:
https://bibliotekanauki.pl/articles/534821.pdf
Data publikacji:
2019
Wydawca:
Wydawnictwo Uniwersytetu Śląskiego
Tematy:
Anna Kańtoch
fantasy writing
genre
synthesis
Opis:
The article endeavours to present the most significant features of Anna Kańtoch’s prose works. Not only is the author in question capable of utilizing various conventions of popular literature, such as: fantasy, science-fiction, and detective stories, but also to mingle them and come up with “hybrid-genres” that are difficult to pigeonhole (Czarne, Niepełnia). Spatial and temporal changeability characterize the novels and short stories of the Katowice-based writer, making the world depicted therein a place existing “in-between,” and moreover, involving both – brutality of rules that world is governed by as well as palpable desire of a proper moral order, which does not always eventually gains the upper hand.
Źródło:
Śląskie Studia Polonistyczne; 2019, 13, 1; 139-154
2084-0772
2353-0928
Pojawia się w:
Śląskie Studia Polonistyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Opracowanie warunków syntezy poliuretanów z pierścieniami imidazochinazolinowymi
Study on the synthesisconditions of polyurethanes with imidazoquinazoline rings
Autorzy:
Szyszkowska, A.
Hęclik, K.
Kisała, J.
Iłowska, J.
Mościpan, M.
Bereska, B.
Zarzyka, I.
Powiązania:
https://bibliotekanauki.pl/articles/279164.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Inżynierii Materiałów Polimerowych i Barwników
Tematy:
poliuretany
synteza
imidazochinazolin
polyurethanes
synthesis
imidazoqinazolin
Opis:
W celu otrzymania poliuretanów linowych z pierścieniami imidazochinazolinowymi przeprowadzono reakcję 1,6-diizocyjanianu heksametylenu z 1-fenylo-2,6-bis(2-hydroksyetylo)imidazo[1,5-c]chinazolino-3,5-dionem (BEFIC). Początkowo reakcję prowadzono w środowisku acetonu w obecności dilaurynianudibutylocyny(IV) jako katalizatora, w temperaturze wrzenia mieszaniny reakcyjnej (54°C). Reakcja przebiegała na granicy faz, co spowodowało niewielkie przereagowanie substratów. Wprowadzenie do układu dodatkowego rozpuszczalnika – sulfotlenku dimetylu i zwiększenie ilości katalizatora również nie zapewniło całkowitego przereagowania diolu. Dopiero zmiana rozpuszczalnika na N,N’-dimetyloformamid pozwoliła prowadzić reakcję w wyższej temperaturze (90°C), co doprowadziło do uzyskania poliuretanu liniowego z dobrą wydajnością (90%). Otrzymany poliuretan scharakteryzowano metodami instrumentalnymi (spektroskopia IR, ¹H-NMR, analiza elementarna i chromatografia żelowa).
In order to obtain linear polyurethanes with imidazoquinazoline rings, the reaction of hexame-thylene 1,6-diisocyanate with 1-phenyl-2,6-bis(2-hydroxyethyl)imidazo[1,5-c]quinazoline-3,5-dione was carried out. Initially, the reaction was carried out in acetone in the presence of dibutyltin(IV)dilaurate as a catalyst, at the boiling point of the reaction mixture. Unfortunately, the conversion degree of substrates was not very high. Therefore, the amount of catalyst was increased. Nevertheless, a significant improvement in the conversion degree of substrates was still not achieved. Only changing the solvent into N,N-dimethylformamide allowed to conduct the reaction at a higher temperature (90°C). It resulted in the obtaining of the linear polyurethane with good yield (90%). The polyurethane was characterized by instrumental methods (IR and ¹H-NMR spectroscopy, elemental analysis and gel permeation chromatography).
Źródło:
Przetwórstwo Tworzyw; 2017, T. 23, Nr 1 (175), 1 (175); 64-72
1429-0472
Pojawia się w:
Przetwórstwo Tworzyw
Dostawca treści:
Biblioteka Nauki
Artykuł
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