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Wyszukujesz frazę "synthesis" wg kryterium: Temat


Tytuł:
An Automatic Synthesis of Musical Phrases from Multi-Pitch Samples
Autorzy:
Pluta, M.
Spalek, L. J.
Delekta, R. J.
Powiązania:
https://bibliotekanauki.pl/articles/177577.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sound synthesis
synthesis methods
sampling
Concatenative Sound Synthesis
Opis:
Sound synthesizers are a natural element of a musician’s toolset. In music arrangement, samplers can often produce satisfactory results, but it requires a combination of manual and automatic methods that may be arduous at times. Concatenative Sound Synthesis reproduces many of natural performance- and expression-related nuances but at a cost of high demand for processing power. Here, another method of musical phrase synthesis aimed at music arrangement is presented that addresses these and other related issues. Contrary to common practice, we propose to record and utilize sound samples containing not one, but short sequences of pitches. In effect, natural pitch transitions are preserved and phrases appear to be much smoother, despite using very limited set of performance rules. The proof-of-concept implementation of the proposed method is discussed in detail along with attempts at optimizing the final sound effects, based on auditory tests. The limitations and future applications of the synthesizer are also discussed.
Źródło:
Archives of Acoustics; 2017, 42, 2; 235-247
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A parametric synthesizer of audio signals on FPGA
Autorzy:
Borko, J.
Dulnik, G.
Grzelka, A.
Łuczak, A.
Paszkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/114575.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
FPGA
sound synthesis
Opis:
The paper presents a sound synthesizer dedicated to parametric sound compression, but also able to generate any signal in the audible band. The synthesizer is realized on an FPGA platform, and it uses additive sound synthesis. The synthesizer is characterized by a high quality, faithful reproduction of sound and low power consumption.
Źródło:
Measurement Automation Monitoring; 2015, 61, 7; 367-369
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methylation demand: a key determinant of homocysteine metabolism.
Autorzy:
Brosnan, John
Jacobs, Rene
Stead, Lori
Brosnan, Margaret
Powiązania:
https://bibliotekanauki.pl/articles/1043276.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
total plasma homocysteine
liver
creatine synthesis
phospholipid synthesis
S-adenosylmethionine
Opis:
Elevated plasma homocysteine is a risk factor for cardiovascular disease and Alzheimer's disease. To understand the factors that determine the plasma homocysteine level it is necessary to appreciate the processes that produce homocysteine and those that remove it. Homocysteine is produced as a result of methylation reactions. Of the many methyltransferases, two are, normally, of the greatest quantitative importance. These are guanidinoacetate methyltransferase (that produces creatine) and phosphatidylethanolamine N-methyltransferase (that produces phosphatidylcholine). In addition, methylation of DOPA in patients with Parkinson's disease leads to increased homocysteine production. Homocysteine is removed either by its irreversible conversion to cysteine (transsulfuration) or by remethylation to methionine. There are two separate remethylation reactions, catalyzed by betaine:homocysteine methyltransferase and methionine synthase, respectively. The reactions that remove homocysteine are very sensitive to B vitamin status as both the transsulfuration enzymes contain pyridoxal phosphate, while methionine synthase contains cobalamin and receives its methyl group from the folic acid one-carbon pool. There are also important genetic influences on homocysteine metabolism.
Źródło:
Acta Biochimica Polonica; 2004, 51, 2; 405-413
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods of controller synthesis using linear matrix inequalities and model predictive control
Autorzy:
Miller, A.
Rybczak, M.
Powiązania:
https://bibliotekanauki.pl/articles/135474.pdf
Data publikacji:
2015
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
controller synthesis
LMI
MPC
predictive controller
controller synthesis methods
optimization methods
Opis:
Controllers based on linear matrix inequalities (LMI) and model predictive control (MPC) both use optimization methods; there are however significant differences between them. In case of LMI controllers, optimization is carried out during controller synthesis, because LMI’s are an optimization tool that requires a linear programming problem being solved. With MPC controllers, however, optimization methods are not used as much in controller synthesis as in controller algorithm operation, to determine optimal control signal values based on the found minimum of the criteria function. A square function is used with boundaries from above and below, which requires a square programming problem, with boundaries for decision variables, being solved. In this paper controller synthesis methods using LMI and MPC are shown, with a focus on the steps that need to be performed, and a comparison of both methods.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 43 (115); 22-28
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sonochemical synthesis of drug molecules nanoparticles: towards controlled drug release
Autorzy:
Chytrosz, P.
Golda-Cepa, M.
Kotarba, A.
Powiązania:
https://bibliotekanauki.pl/articles/286014.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
nanoparticles
drugs
sonochemical synthesis
Źródło:
Engineering of Biomaterials; 2018, 21, 148; 69
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Implementation of Reconfigurable PLC on FPGA Platform
Autorzy:
Milik, A.
Hrynkiewicz, E.
Powiązania:
https://bibliotekanauki.pl/articles/226640.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
PLC
LD
IL
FPGA
high level synthesis
logic synthesis
arithmetic circuits
reconfigurable hardware
Opis:
The paper presents a set of algorithms dedicated for synthesis of reconfigurable logic controllers implemented on FPGA platform and programmed according to IEC1131 and EN61131. The program is compiled to hardware structure with a massive parallel processing. The developed method automatically allocates resources and operations. It controls resource usage and operation timing. Using mixed concept of operation allocation that considers operation timing and forms combinatorial chains of operations number of execution cycles can be reduced. An example of logic functions, PID controller and mixed arithmetic and logic programming examples are considered. Introducing the automatic implementation method allows flexible implementing the control algorithms. The maximal possible parallelism (limited only by the algorithm dependencies and available resources) is introduced.
Źródło:
International Journal of Electronics and Telecommunications; 2012, 58, 1; 85-94
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
In silico screening, synthesis, in vitro evaluations antibacterial and DPPH scavenging activity of some 1,3,5-trisubstituted 2-pyrazoline derivatives as dihydrofolate reductase inhibitors
Autorzy:
Suriya, S.
Mala, V.
Powiązania:
https://bibliotekanauki.pl/articles/1112558.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Synthesis
antibacterial
antioxidant
chalcone
pyrazoline
Opis:
In this work, synthesis of three pyrazoline derivatives (6-8) is described. (E)-1,3-(phenylsubstituted)-prop-2-en-1-one (3-5) is prepared by the reaction of substituted benzaldehyde with 4-methylacetophenone, whereas condensation cyclization of the same chalcones (3-5) with phenylhydrazine hydrate in ethanol yielded 6-8. The structures of the title compounds (6-8) were characterized by chemical reactions, elemental analysis, and spectral methods such as IR spectra. The synthesized chalcone and pyrazolines were evaluated for in-vitro antibacterial and antioxidant activities against standard. The zone of inhibition for some of the newly synthesized compounds showed notable antibacterial activity against selected bacterial strains when compared with ampicillin. Significant antioxidant activities were also shown by chalcone and pyrazolines.
Źródło:
World News of Natural Sciences; 2018, 18, 2; 180-186
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Indexed Partition Calculus in Logic Synthesis of Boolean Functions for FPGAs
Autorzy:
Rawski, M.
Powiązania:
https://bibliotekanauki.pl/articles/226483.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
indexed partition
logic synthesis
FPGA
Opis:
Functional decomposition of Boolean functions specified by cubes proved to be very efficient. Most popular decomposition methods are based on blanket calculus. However computation complexity of blanket manipulations strongly depends on number of function's variables, which prevents them from being used for large functions of many input and output variables. In this paper a new concept of indexed partition is proposed and basic operations on indexed partitions are defined. Application of this concept to logic synthesis based on functional decomposition is also discussed. The experimental results show that algorithms based on new concept are able to deliver good quality solutions even for large functions and does it many times faster than the algorithms based on blanket calculus.
Źródło:
International Journal of Electronics and Telecommunications; 2011, 57, 2; 209-216
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
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:
Biosynthesis of antibacterial silver nano-particles from Aspergillus terreus
Autorzy:
Singh, P. Shivakumar
Vidyasagar, G. M.
Powiązania:
https://bibliotekanauki.pl/articles/1112999.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Bio-synthesis
Silvernanoparticles
TEM
UV
Opis:
This paper deals with the bio-synthesis of silver nano-particles using a soil fungi. In this work, FTIR examinations indicated that the encountered soil particles actually contained Silver particles, while XRD analysis confirmed the silver was in the nano-crystalline phase. Moreover, the hurried decline of silver (Ag+) ions monitored using UV-visible spectrophotometer, demonstrated that these silver nano-particles formed within 19 minutes. In addition, transmission electron microscopy (TEM) revealed that the synthesized silver nano-particles come in a size ranging between 16-57 nm and have a variety of shapes, including round, rod and uneven. The present study thus concludes that silver nano-particles were actually produced and that these have admirable antibacterial activity. The current study also indicates that increasing concentration increases the rate of reduction and decreases the particle size.
Źródło:
World News of Natural Sciences; 2018, 16; 109-116
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chitosan-based nanocomposites modified with reduced graphene oxide prepared via green synthesis
Autorzy:
Kosowska, K.
Domalik-Pyzik, P.
Jagiełło, J.
Lipińska, L.
Chłopek, J.
Powiązania:
https://bibliotekanauki.pl/articles/284680.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
nanocomposites
graphene oxide
green synthesis
Źródło:
Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 59
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolutionary Algorithm that Designs the DNA Synthesis Procedure
Autorzy:
Michalak, M.
Nowak, R.
Powiązania:
https://bibliotekanauki.pl/articles/308431.pdf
Data publikacji:
2011
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
bioinformatics
gene synthesis
optimum searching
Opis:
Chemical synthesis of nucleotide chains is very erroneous for long sequences. Often a gene is constructed from short fragments joined with the use of complementary helper chains. The number of possible potential solutions for a long gene synthesis is very large, therefore a fast automated search is required. In the presented approach a modified method of long DNA construction is proposed. A computer program that searches for an optimal solution in the space of potential synthesis methods has been developed. This software uses an evolutionary algorithm for global optimization and a hillclimbing algorithm for local optimization. The long DNA construction method was tested on random sequences. The results are very promising. The next step is to perform experiments in a biotechnological wet laboratory involving DNA strand synthesis using the method designed by the presented software.
Źródło:
Journal of Telecommunications and Information Technology; 2011, 4; 50-54
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robot modelling, perception, and motion synthesis
Autorzy:
Tchoń, K.
Zieliński, C.
Powiązania:
https://bibliotekanauki.pl/articles/384804.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
robot modelling
perception
motion synthesis
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2017, 11, 2; 3-4
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
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:
Przykłady otrzymywania nanocząstek z wykorzystaniem mikrofalowej solwotermalnej syntezy MSS
Examples of the Nanoparticles Produced by Microwave Solvothermal Synthesis (MSS) Route
Autorzy:
Wojnarowicz, J.
Chudoba, T.
Smoleń, D.
Łojkowski, W.
Majcher, A.
Mazurkiewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/167882.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych
Tematy:
nanocząstki
synteza hydrotermalna
synteza solwotermalna
reaktor mikrofalowy
nanoparticles
hydrothermal synthesis
solvothermal synthesis
microwave reactor
Opis:
Proces mikrofalowej syntezy solwotermalnej (Microwave Solvothermal Synthesis, MSS) jest przykładem zastosowania wspomagającego reakcje chemiczne promieniowania mikrofalowego. Grzanie mikrofalowe umożliwia precyzyjne programowanie czasu syntezy. Dzięki temu możliwe jest uzyskiwanie cząstek charakteryzujących się wąskim rozkładem wielkości oraz wysokim stopniem krystaliczności (tzn. niskim udziałem faz amorficznych). Dodatkową zaletą procesu jest znacznie niższa temperatura w porównaniu z technologiami: plazmowymi, zol żel, syntezy z fazy gazowej. W artykule przedstawiono nowe reaktory do realizacji procesów MSS. Podano przykłady syntez hydroksyapatytu, tlenku cynku i tlenku cyrkonu. Wykazano możliwość sterowania właściwościami uzyskiwanych materiałów. Reaktory typu MSS-1 i MSS-2 stwarzają możliwość przemysłowej produkcji nanocząstek.
Microwave solvothermal synthesis (MSS) is an example of microwave assisted wet chemical synthesis process. Microwave heating enables a precise control of the reaction time, fast heating and reducing the thermal gradients. This results in a better crystallinity of the nanoparticles comparing to the precipitation process, and a narrow size distribution. An additional advantage is a reduced synthesis temperature, since no calcination is need. In the paper we presented two new reactors used for the MSS process. We have shown their applications in the synthesis of nanohydroksyapatite ZnO and ZrO2, as well as the enhanced control of their properties possible due to the use of microwaves. The MSS-1 and MSS-2 reactors enable industrial scale production of nanoparticles.
Źródło:
Szkło i Ceramika; 2014, R. 65, nr 6, 6; 8-11
0039-8144
Pojawia się w:
Szkło i Ceramika
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:
Synthesis of multiple-valued logic networks for FPGA implementation using developmental genetic programming
Autorzy:
Deniziak, S.
Wiśniewski, M.
Wieczorek, K.
Powiązania:
https://bibliotekanauki.pl/articles/114577.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
multiple-valued functions
FPGA
symbolic synthesis
Opis:
This paper presents a method of FPGA-oriented synthesis of multiple-valued logical networks. A multiple-valued network consists of modules connected by multivalued signals. During synthesis the modules are decomposed into smaller ones. For this purpose the symbolic decomposition is applied. Since the decomposition of modules strongly depends on the encoding of multiple-valued inputs and outputs, the result of synthesis depends on the order, in which the consecutive modules are implemented. Experimental results showed that our approach significantly reduces the cost of implementation.
Źródło:
Measurement Automation Monitoring; 2016, 62, 8; 278-281
2450-2855
Pojawia się w:
Measurement Automation Monitoring
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:
Modelling of the Synthesis of 1,1-Diamino-2,2-dinitroethene (DADNE)
Autorzy:
Trzciński, W. A.
Chyłek, Z.
Powiązania:
https://bibliotekanauki.pl/articles/358345.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
DADNE
modelling of the synthesis
kinetics
Opis:
In this work the conditions and kinetics of nitration of 2-methylpyrimidine- 4,6-dione (MPD), which leads to the formation of 1,1-diamino-2,2-dinitroethene (DADNE), are presented. An analysis of literature data enabled us to propose a model and a mathematical formulation of the synthesis of DADNE. The model was verified on the basis of literature data and our own experimental data. The influence of the addition time of nitric acid into a model reactor on temperature and composition of the reaction mixture was investigated. The proposed synthesis model could be useful in a study of the MPD nitration process on a large, laboratory scale.
Źródło:
Central European Journal of Energetic Materials; 2012, 9, 2; 101-117
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:
On Transformation of a Logical Circuit to a Circuit with NAND and NOR Gates Only
Autorzy:
Baranov, S.
Karatkevich, A.
Powiązania:
https://bibliotekanauki.pl/articles/963932.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
logic synthesis
logic devices
VLSI
minimization
Opis:
In the paper we consider fast transformation of a multilevel and multioutput circuit with AND, OR and NOT gates into a functionally equivalent circuit with NAND and NOR gates. The task can be solved by replacing AND and OR gates by NAND or NOR gates, which requires in some cases introducing the additional inverters or splitting the gates. In the paper the quick approximation algorithms of the circuit transformation are proposed, minimizing number of the inverters. The presented algorithms allow transformation of any multilevel circuit into a circuit being a combination of NOR gates, NAND gates or both types of universal gates.
Źródło:
International Journal of Electronics and Telecommunications; 2018, 64, 3; 373-378
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of Macro Petri Nets into FPGA with Distributed Memories
Autorzy:
Bukowiec, A.
Adamski, M.
Powiązania:
https://bibliotekanauki.pl/articles/226342.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
decomposition
FGPAs
logic synthesis
Petri nets
Opis:
In this paper a new method of Petri net array-based synthesis is proposed. The method is based on decomposition of colored interpreted macro Petri net into state machine subnets. Each state machine subnet is determined by one color. During the decomposition process macroplaces are expanded or replaced by doublers of macroplace. Such decomposition leads to parallel implementation of a digital system. The structured encoding of places is done by using minimal numbers of bits. Colored microoperations, which are assigned to places, are written into distributed and flexible memories. It leads to realization of a logic circuit in a two-level concurrent structure, where the combinational circuit of the first level is responsible for firing transitions, and the second level memories are used for generation of microoperations. Such an approach allows balanced usage of different kinds of resources available in modern FPGAs.
Źródło:
International Journal of Electronics and Telecommunications; 2012, 58, 4; 403-410
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
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:
The activity of fused-iron catalyst doped with lithium oxide for ammonia synthesis
Autorzy:
Jedrzejewski, R.
Lendzion-Bieluń, Z.
Arabczyk, W.
Powiązania:
https://bibliotekanauki.pl/articles/779518.pdf
Data publikacji:
2016
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
iron catalyst
ammonia synthesis
lithium oxide
Opis:
The iron catalyst precursor promoted with Al2O3, CaO, and Li2O was obtained applying the fusing method. Lithium oxide forms two phases in this iron catalyst: a chemical compound with iron oxide (Li2Fe3O4) and a solid solution with magnetite. The catalyst promoted with lithium oxide was not fully reduced at 773 K, while the catalyst containing potassium was easily reducible at the same conditions. After reduction at 873 K the activity of the catalyst promoted with lithium oxide was 41% higher per surface than the activity of the catalyst promoted with potassium oxide. The concentration of free active sites on the surface of the catalyst containing lithium oxide after full reduction was greater than the concentration of free active sites on the surface of the catalyst promoted with potassium oxide.
Źródło:
Polish Journal of Chemical Technology; 2016, 18, 2; 78-83
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technology mapping oriented to adaptive logic modules
Autorzy:
Kubica, M.
Kania, D.
Powiązania:
https://bibliotekanauki.pl/articles/200466.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
decomposition
logic synthesis
technology mapping
ALM
Opis:
This paper presents an innovative method of technology mapping of the circuits in ALM appearing in FPGA devices by Intel. The essence of the idea is based on using triangle tables that are connected with different configurations of blocks. The innovation of the proposed method focuses on the possibility of choosing an appropriate configuration of an ALM block, which is connected with choosing an appropriate decomposition path. The effectiveness of the proposed technique of technology mapping is proved by experiments conducted on combinational and sequential circuits.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 5; 947-956
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical 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:
Green chemistry for the preparation of silver nanoparticles using mint leaf leaves extracts and evaluation of their antimicrobial potential
Autorzy:
Aziz, Wisam J.
Jassim, Haneen A.
Powiązania:
https://bibliotekanauki.pl/articles/1112556.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Green synthesis
Mentha (Mint)
Silver Nanoparticles
Opis:
The aim of this study was to develop a green synthesis of silver nanoparticles using mint plant leaves extracts. The fresh suspension of plant extracts was yellowish-green in color. However, after the addition of AgNO3 within 15min, the suspension showed a change in color to dark brown after 5 hours of incubation at room temperature. The formation of silver nanoparticles was confirmed using UV-Vis spectral analysis and revealed silver surface plasmon resonance band to be in a range around 200-500 nm. The XRD pattern showed the characteristic bragg peaks of (111), (200) and (220) planes of the face center cubic (FCC) silver nanoparticles AgNPS. Under scanning electron microscope (SEM), silver nanoparticles with a mean particle size of 26 nm and a spherical shape were most frequently observed. In testing, the synthesized AgNPs colloidal solution showed better antibacterial activity against both Gram-positive and Gram-negative bacterial strains. The diameter of the inhibition zones of AgNPs at 50 µg/ml concentration against bacterial strains such as Bacillus subtilis and Escherichia coli were 25 mm and 20 mm, respectively.
Źródło:
World News of Natural Sciences; 2018, 18, 2; 163-170
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design, Synthesis, Characterization and Biological evaluation of (4-(7-chloroquinolin-4-yl)piperazin-1-yl)(substitutedphenyl)methanones as antimicrobial agents
Autorzy:
Parmar, Nilesh D.
Hadiyal, Sanjay D.
Kapupara, Vimal H.
Kalavadiya, Prakash L.
Gojiya, Dinesh G.
Bhatt, Tejal
Vekariya, Mitesh B.
Chovatiya, Pankaj J.
Joshi, Hitendra S.
Powiązania:
https://bibliotekanauki.pl/articles/1075589.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Chloroquinoline
antimicrobial agents
multistep synthesis
piperazine
Opis:
A series of (4-(7-chloroquinolin-4-yl)piperazin-1-yl)(substitutedphenyl)methanones were prepared via multistep synthesis which involved acrylation without base, cyclisation, hydrolysis, decarboxylation, electrophilic chlorination reactions and subsequent chloro-amine coupling with various substituted benzoyl chloride derivatives. The structure of the synthesized compounds was established by using elemental analysis, FT-IR, 1H NMR, 13C NMR and Mass spectroscopy. All the novel compounds have been tested on thin layer chromatographic plate for purity and evaluated for their antimicrobial activity against gram positive and gram negative bacteria which demonstrated moderate to good antimicrobial activity.
Źródło:
World Scientific News; 2019, 122; 193-205
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microbiological processes in folacin synthesis in kefir
Mikrobiologiczne procesy syntezy folacyny w kefirze
Autorzy:
Drewek, Z.
Czarnocka-Roczniakowa, B.
Powiązania:
https://bibliotekanauki.pl/articles/1398631.pdf
Data publikacji:
1986
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
folacin synthesis
kefir microflora
yeast influence
Opis:
It was found that folacin is produced by microflora of kefir grains. The folacin content in kefir increases threefold as a result of fermentation and cold storage. Experiments with modified kefir grains in which the ratio of bacteria number to yeast was changed, indicates the dominant role of yeast in folacin synthesis. However, the kefir grains with increased yeast number bad an adverse effect on the organoleptic qualities of kefir.
Badania zmierzały do ustalenia zmian zawartości folacyny w toku produkcji i przechowywania kefiru, ze szczególnym uwzględnieniem roli mikroflory grzybków kefirowych w kształtowaniu poziomu tej witaminy. W wyniku biosyntezy, zachodzącej przy udziale mikroflory ziarn kefirowych, wyrównywane zostają podczas fermentacji straty folacyny spowodowane pasteryzacją mleka (średnio 20%), a następnie kefir zostaje wzbogacony w tę witaminę o 115% w stosunku do mleka pasteryzowanego. W badaniach wpływu poszczególnych ugrupowań mikroflory ziarn kefirowych na biosyntezę folacyny, stwierdzono, że same ziarna są bogatym źródłem tej witaminy (70-77 μg/100 g) oraz ustalono, że biosynteza ta w kefirze zachodzi głównie przy udziale drożdży. Jednakże produkcja kefiru przy użyciu ziarn kefirowych o zwiększonej liczbie komórek drożdży prowadzi do niekorzystnych zmian cech organoleptycznych napoju. Praktyczne znaczenie mają natomiast obserwacje zmian zawartości folacyny w kefirze produkowanym sposobem tradycyjnym. W badaniach tych na uwagę zasługuje znaczne zwiększenie poziomu folacyny podczas przetrzymywania napojów Przez 24-48 h w temperaturze chłodniczej ( +4°C), tym bardziej, że warunki te wpływają także korzystnie na wartość dietetyczną i cechy smakowe kefiru. Mikroflora ziarn kefirowych syntetyzuje związki grupy kwasu foliowego, których zawartość Wzrasta trzykrotnie podczas fermentacji, dojrzewania i chłodniczego przechowywania napojów.
Źródło:
Acta Alimentaria Polonica; 1986, 12, 1; 39-45
0137-1495
Pojawia się w:
Acta Alimentaria Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation and characterization of ultra-fine silver bromide suspension
Autorzy:
Król-Gracz, A.
Michalak, E.
Nowak, P.
Dyonizy, A.
Powiązania:
https://bibliotekanauki.pl/articles/115949.pdf
Data publikacji:
2011
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
nanoparticles
silver bromide
synthesis method
gelatine
Opis:
This paper present the results of studies on ultra fine-crystalline silver bromide suspensions, which were stabilized by gelatin and excess of bromide ions. Relation between dosing rate of reactants to size of obtained silver bromide crystals was investigated. Granulometric properties obtained nanocrystals were studied by turbidity method and by technique of Dynamic Light Scattering (DLS). Additionally, a photomicrograph of suspension using Scanning Electron Microscopy (SEM) was performed.
Źródło:
Challenges of Modern Technology; 2011, 2, 2; 38-42
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
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
Tytuł:
m-Synthesis control of flexible modes of AMB rotor
Autorzy:
Mystkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/386538.pdf
Data publikacji:
2010
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
wirnik
synthesis
elastyczność
rotor
synteza
flexibility
Opis:
In the paper the optimal robust vibration control of flexible rotor supported by the active magnetic bearings (AMBs) is investigated. The purpose of the control system is stabilization of the high speed rotor and effective control of the rotor vibration due to noncollocation, gyroscopic effects and model uncertainties. The noncollocation effect is considered and frequency modal analysis of the noncollocated AMBs system with gyroscopic effects is presented. The ž-Synthesis control is applied to stabilize the rigid and flexible critical frequency modes of the rotor, with emphasis structural and parametric uncer-tainty. The input and output signals in AMBs system are limited by the weighting functions. The singular value analysis is used to obtain therobust performances of the closed-loop system. The stable operation and good stiffness of the high speed rotor supported magnetically is reached. The dynamical behaviour of the AMBs rotor is evaluated in the range up to 21 000 rpm. The experimental tests show the effectiveness of the robust control system as well as good vibrations reduction and robustness of the designed controllers.
Źródło:
Acta Mechanica et Automatica; 2010, 4, 4; 83-90
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robot Grasp Synthesis Under Object Pose Uncertainty
Autorzy:
Szynkiewicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/950999.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
grasp synthesis
pose uncertainty
grasp quality
Opis:
This paper addresses the problem of grasp synthesis for grasping objects considering both object pose uncertainty and object dynamics. These two factors greatly affect success or failure in a real-world robotic grasping and should be considered simultaneously. The proposed approach is based on simulation of grasping process assuming that the 3D model of the object is known. Object geometry is modelled using superquadrics. To evaluate grasp quality three different measures are utilised. The proposed grasp synthesis approach will be implemented and tested on a real robot with multi-fingered hand.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2015, 9, 1; 53-61
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Easy, Simplistic and Green Synthesis of Various Benzimidazole and Benzoxazole Derivatives Using PEG400 as a Green Solvent
Autorzy:
Khunt, M. D.
Kotadiya, V. C.
Viradiya, D. J.
Baria, B. H.
Bhoya, U. C.
Powiązania:
https://bibliotekanauki.pl/articles/411999.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
PEG-400
Benzimidazole
Benzoxazole
Green synthesis
Opis:
An improved environmentally benign procedure for the synthesis of various benzimidazole and benzoxazole derivatives using green solvent PEG400. We have optimized the reaction condition and it was found that PEG400 was believed to be best as compared to PEG200, PEG600 and PEG800 at 80 to 85 °C. This method provides a novel route for the synthesis of benzimidazole and benzoxazole derivatives. The main attractive features of this process are a mild reaction conditions, easy workup procedure and good to excellent yield. The structures of all the synthesized compounds were confirmed by 1H NMR, IR, MASS and Elemental Analysis.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 6; 61-68
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and characterization of substituted bisbenzoxazine as potent antimicrobial agent
Autorzy:
Lalcheta, K.R.
Dhaduk, D.D.
Mendapara, J.P.
Powiązania:
https://bibliotekanauki.pl/articles/412174.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Benzoxazines
synthesis
microbial activity
Spectral techniques
Opis:
Bisbenoxazines derivatives were synthesized by refluxing substituted bisphenol-C, substituted aniline and formaldehyde in presence of 1,4-dioxane with good yields. All the synthesized compounds were characterized by mass, NMR and IR and also evaluated for antimicrobial activity against four different bacterial and two fungal strains. The compounds 1c, 1h, 1j and 1l has found comparatively good active against all the bacterial strains.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2015, 40; 73-80
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
UVB Radiation Impact on Activity of DNA and Cellular Protein Synthesis of Water Environment Bacteria
Wpływ UVB na aktywność syntezy DNA i białek komórkowych przez bakterie środowiska wodnego
Autorzy:
Walczak, M.
Burkowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/389411.pdf
Data publikacji:
2011
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
UV
synteza DNA
synteza białek
substancje humusowe
mikrowarstwa powierzchniowa
DNA synthesis
protein synthesis
humic substances
surface microlayer
Opis:
The studies were carried out in 2007 based on water samples collected from SM and SW of pelagic zone of Brzezno lake. For the purpose of further research, representative collection of bacterial strains was isolated from collected samples. The progress of the research included estimation of the DNA and cellular protein synthesis activity of the bacteria subjected to UVB radiation. The survey was conducted in two experimental layouts: with and without humic substances (HS) playing role of compounds potentially protective from UV radiation. Conducted research demonstrated that under influence of UVB radiation the SM and SW bacteria activity of DNA and cellular protein synthesis were strongly inhibited. On the other hand, presence of HS have another impact on DNA and cellular protein synthesis.
Badania prowadzono w 2007 r., pobierając próbki wody z MP i WPP w strefie pelagialu jeziora Brzeźno. Z pobranych próbkach wody izolowano reprezentatywną kolekcję szczepów, na których wykonywano dalsze badania. W toku badań oznaczano aktywność syntezy DNA i białek komórkowych bakterii poddanych promieniowaniu UVB. Badania prowadzono w dwóch układach doświadczalnych: bez substancji humusowych (SH) i w obecności tych substancji jako związków o działaniu potencjalnie ochronnych przed UV. Przeprowadzone badania wykazały, że pod wpływem promieniowania UVB aktywność syntezy DNA i białek komórkowych ulegały silnej inhibicji. Natomiast obecność SH inaczej wpływa na syntezę DNA i białek.
Źródło:
Ecological Chemistry and Engineering. A; 2011, 18, 3; 469-475
1898-6188
2084-4530
Pojawia się w:
Ecological Chemistry and Engineering. A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on template-synthesized polypyrrole nanostructures
Autorzy:
Starosta, W.
Buczkowski, M.
Sartowska, B.
Wawszczak, D.
Powiązania:
https://bibliotekanauki.pl/articles/146221.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
template synthesis
track-etched membranes
polypyrrole nanotubules
Opis:
The paper presents a short review of recent achievements in the rapidly growing field of the template synthesis of nanostructures together with their possible application. The results of our own work, concerning the polypyrrole nanotubules synthesis inside pores of track-etched membranes, have been presented as well. Finally, the kinetics of nanotubule growth process using the SEM method and permeability for air of the resulting structures has been also determined.
Źródło:
Nukleonika; 2006, 51,suppl.1; 35-39
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Information aspects of optimization synthesis of functional-modular structure of technological equipment
Autorzy:
Palchevskyi, B.
Powiązania:
https://bibliotekanauki.pl/articles/118005.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
information technology
technological equipment
design
synthesis
structure
Opis:
The paper presents the information approach to the design of equipment with functional-modular structure. The advantages and drawbacks of various technologies of synthesis are shown.
Źródło:
Applied Computer Science; 2013, 9, 1; 17-33
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reduced number of design parameters in optimum path synthesis with timing of four-bar linkage
Autorzy:
Buśkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/279257.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
path synthesis
evolutionary algorithm
four-bar linkage
Opis:
The paper presents the method for the optimal synthesis of four-link mechanism generating open/closed paths with time prescription. Although the method is suitable for both closed and open paths, it enables decreasing the number of design parameters describing dimensions, orientation and position of a path generator. Compared to the methods presented in the references, this is a one-phase synthesis method; although the number of design parameters is reduced, the method does not require affine transformations to be performed on the synthesised mechanism. The effectiveness of the method is discussed based on examples of three paths, with two taken from the literature.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 43-55
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on a New Synthesis of LLM-105 Using N-Nitroso-bis(cyanomethyl)amine
Autorzy:
Jing, S.
Liu, Y.
Liu, D.
Guo, J.
Powiązania:
https://bibliotekanauki.pl/articles/358371.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
LLM-105
energetic materials
synthesis
characterization
properties
Opis:
A new three-step synthetic method was designed to prepare 2,6-diamino- 3,5-dinitropyrazine 1-oxide (LLM-105) with an overall yield of 43.5%, using iminodiacetonitrile, triethylamine and hydroxylamine hydrochloride as the starting materials, and involved nitrosylation, cyclization and nitration. The structure of LLM-105 was characterized by FTIR, 1H NMR spectroscopy and elemental analysis. The crucial factors and mechanism of the cyclization were explored. Thermal decomposition, mechanical sensitivity and the purity of the LLM-105 were determined by TG-DTA, an impact sensitivity instrument and high performance liquid chromatography (HPLC) respectively. The results showed that LLM-105 synthesised via 2,6-diamino-3,5-dinitropyrazine (ANPZ) was less sensitive to impact, but the LLM-105 synthesized by the new method had some obvious advantages in terms of purity, security and production costs. Moreover, the LLM-105 synthesized by this new method can be initiated reliably without recrystallization.
Źródło:
Central European Journal of Energetic Materials; 2016, 13, 1; 21-32
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Combustion Synthesis of Titanium Carbonitrides
Autorzy:
Dyjak, S.
Wasilewska, M.
Cudziło, S.
Powiązania:
https://bibliotekanauki.pl/articles/358421.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
combustion synthesis
titanium carbonitride
ceramics
refractory materials
Opis:
Titanium carbonitride (TiC0.5N0.5) micron powders were synthesized in reactions of titanium with zinc dicyanide: Zn(CN)2 + 4Ti → 4TiC0.5N0.5 + Zn. The reactions are sufficiently exothermic to propagate in the reactant mixture to form a self-sustaining, high-temperature synthesis (SHS). The final product was separated and the only byproduct (zinc) was removed by dissolution in dilute hydrochloric acid. The use of zinc dicyanide as the source of carbon and nitrogen causes the titanium carbonitride to contain only these elements in an atomic ratio of one. The reaction temperature can be easily reduced by the addition of zinc powder to the green mixture. Synthesis in the presence of zinc yields TiC0.5N0.5 powders consisting of round-shaped and unagglomerated particles.
Źródło:
Central European Journal of Energetic Materials; 2015, 12, 2; 249-259
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Demonstration of Wet Chemical Synthesis of Nanomaterials for High School Students
Autorzy:
Acharyya, Swarnali
Acharyya, Sarani
Samanta, Pijus Kanti
Powiązania:
https://bibliotekanauki.pl/articles/1031206.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Chemical Synthesis
Electronics
Nanomaterials
Nanotechnology
School-education
Opis:
Nanotechnology is the most emerging branch of science and technology leading to the development of devices starting from electronics to biomedical devices. It is thus desired that the students should have basic idea of this new emerging technology during their school education. Experimental demonstration of simple experiments of synthesizing nanomaterials and demonstration of its properties are very much important in motivating the students to learn this new technology. Wet chemical synthesis method is a simple and cost-effective method that can be adopted in the chemistry laboratory of higher secondary level school education in India. This hands-on experience will encourage the students to enter more into this nanotechnology.
Źródło:
World Scientific News; 2020, 148; 15-26
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł

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