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    Wyświetlanie 1-7 z 7
    Tytuł:
    Anion alkoksyallenowy w syntezie związków naturalnych i ich analogów
    Alkoxyallene anion in the synthesis of natural products and their analogues
    Autorzy:
    Busiak, B.
    Utecht, G.
    Jasiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/172377.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    alkoksyalleny
    addycja nukleofilowa
    synteza organiczna
    związki naturalne
    związki heterocykliczne
    alkoxyallenes
    nucleophilic addition
    organic synthesis
    natural products
    heterocycles
    Opis:
    Among diverse systems containing multiple bonds, cumulenes are recognized as the most reactive derivatives towards both nucleophilic and electrophilic agents, and for this reason, they are considered as important class of substrates for organic synthesis. Over the last three decades alkoxyallenes have been demonstrated as highly useful C3-building blocks for the construction of numerous N-, O-, and S-containing heterocycles, including enantiomerically pure compounds. Special attention has been paid to lithiated alkoxyallenes as suitable nucleophiles for the reactions with alkyl halides, strained heterocycles, carbonyl compounds and their derivatives. The presence of the allene unit in the initially formed adducts opens up several possibilities in the preparation of more complex systems. In this review, selected applications of lithiated alkoxyallenes in the synthesis of natural products and their analogues are discussed.
    Źródło:
    Wiadomości Chemiczne; 2016, 70, 1-2; 3-23
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectroscopic Study of $CO_2$ Plasma in Microwave Source Designed for Hydrogen Production via Hydrocarbons Decomposition
    Autorzy:
    Hrycak, B.
    Jasiński, M.
    Mizeraczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1366177.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.25.Os
    52.50.Dg
    52.70.Kz
    52.80.Pi
    Opis:
    In this paper, results of spectroscopic study of microwave (2.45 GHz) plasma at atmospheric pressure and high $CO_2$ flow rate are presented. The plasma was generated by waveguide-supplied nozzleless cylindrical type microwave plasma source. Working gas flow rate and microwave absorbed power varied from 50 up to 150 l/min and from 1 up to 5.5 kW, respectively. The emission spectra in the range of 300-600 nm were recorded. The rotational and vibrational temperatures of $C_2$ molecules, as well as the rotational temperature of OH radicals were determined by comparing the measured and simulated spectra. The plasma gas temperature inferred from rotational temperature of heavy species ranged from 4000 to 6000 K. It depended on location in plasma, microwave absorbed power and working gas flow rate. The presented microwave plasma source can be used in various gas processing applications.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1326-1328
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Investigation of Low Power Microwave Microplasma Source
    Autorzy:
    Czylkowski, D.
    Hrycak, B.
    Jasiński, M.
    Mizeraczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1198978.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.50.Dg
    52.70.Ds
    52.70.Kz
    52.80.Pi
    Opis:
    The aim of this paper is to present a novel microwave microplasma source generated in different gases at atmospheric pressure. The design, rule of operation and experimental investigations of the new microwave microplasma source are described. The main advantage of the presented microwave microplasma source is its small size, simplicity, and low cost of construction and operation. The microplasma has a form of a small plasma jet of dimensions of a few mm, depending on the kind of gas, gas flow rate, and absorbed microwave power. Presented in this paper results of experimental investigations were obtained with an atmospheric pressure argon, krypton, nitrogen, and air microplasma, sustained by microwaves of standard frequency of 2.45 GHz. The absorbed microwave power was up to 70 W. The gas flow rate was from 2 to 25 l/min. The miniature size, simplicity of the source and stability of the microplasma allow to conclude that the presented new microwave microplasma source can find practical applications in various fields.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1323-1325
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microwave plasma for hydrogen production from liquids
    Autorzy:
    Czylkowski, D.
    Hrycak, B.
    Miotk, R.
    Jasiński, M.
    Mizeraczyk, J.
    Dors, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/148564.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dry reforming
    ethanol
    hydrogen production
    isopropanol
    kerosene
    microwave plasma
    Opis:
    The hydrogen production by conversion of liquid compounds containing hydrogen was investigated experimentally. The waveguide-supplied metal cylinder-based microwave plasma source (MPS) operated at frequency of 915 MHz at atmospheric pressure was used. The decomposition of ethanol, isopropanol and kerosene was performed employing plasma dry reforming process. The liquid was introduced into the plasma in the form of vapour. The amount of vapour ranged from 0.4 to 2.4 kg/h. Carbon dioxide with the fl ow rate ranged from 1200 to 2700 NL/h was used as a working gas. The absorbed microwave power was up to 6 kW. The effect of absorbed microwave power, liquid composition, liquid fl ow rate and working gas fl ow rate was analysed. All these parameters have a clear infl uence on the hydrogen production effi ciency, which was described with such parameters as the hydrogen production rate [NL(H2)/h] and the energy yield of hydrogen production [NL(H2)/kWh]. The best achieved experimental results showed that the hydrogen production rate was up to 1116 NL(H2)/h and the energy yield was 223 NL(H2) per kWh of absorbed microwave energy. The results were obtained in the case of isopropanol dry reforming. The presented catalyst-free microwave plasma method can be adapted for hydrogen production not only from ethanol, isopropanol and kerosene, but also from different other liquid compounds containing hydrogen, like gasoline, heavy oils and biofuels.
    Źródło:
    Nukleonika; 2016, 61, 2; 185-190
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Differing attitudes for various population groups towards homeless people
    Autorzy:
    Krajewska-Kułak, E.
    Wejda, U.
    Kułak-Bejda, A.
    Łukaszuk, C.
    Repka, B.
    Guzowski, A.
    Cybulski, M.
    Stelcer, B.
    Jasiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1917758.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Medyczny w Białymstoku
    Tematy:
    Homeless people
    youth
    attitudes
    Opis:
    Introduction: People who are homeless are most often unable to acquire and maintain regular, safe, secure, and adequate housing, or they lack a “fixed, regular, and adequate night-time residence”. Purpose: To assess the attitude of secondaryschool students, high-school students, university students, and working adults towards homeless people. Materials and methods: A survey of 420 randomly selected middle school students (n=120), high school students (n=100), university students (n=100), and working adults (n=100) was conducted. Nearly half of the participants reported a fear of homeless people. Results: According to the majority of respondents, a homeless person collects scrap metal and waste paper, and also begs. The first words that come to mind when a majority of people think of the homeless were: poor, unhappy, dirty, lonely, and smelly. The participants reported the main reasons for homelessness to be: joblessness, family problems, alcohol, helplessness, and avoiding work. The majority of respondents argued that social and legal problems are the main reasons that it is difficult for homeless people to extricate themselves from their situation. The groups surveyed had a variety of opinions about homelessness. According to most respondents, a homeless person is a poor, miserable, lonely, childless man with a vocational education who begs, collects scrap metal and waste paper, and is also usually dirty and smelly. Conclusions: In the survey groups, respondents’ opinions about homelessness varied.
    Źródło:
    Progress in Health Sciences; 2016, 6(1); 57-62
    2083-1617
    Pojawia się w:
    Progress in Health Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Medical students’ perceptions of people with disabilities
    Autorzy:
    Guzowski, A.
    Kułak-Bejda, A.
    Stelcer, B.
    Jasiński, M.
    Łukaszuk, C.R.
    Cybulski, M.
    Kułak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1918400.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Medyczny w Białymstoku
    Tematy:
    Medical students
    attitudes
    people with disabilities
    life satisfaction
    empathy
    Opis:
    Introduction: Little is known about associations of attitudes of medical students towards people with disabilities and their life satisfaction and empathy. Purpose: To assess the social perception of people with disabilities by medical students. Materials and methods: The present study interviewed 451 medical students of the Medical University of Białystok regarding their perceptions of people with disabilities, especially in light of their own satisfaction with life and empathy. We used the following questionnaires: the original questionnaire about attitudes towards people with disabilities, The Satisfaction with Life Scale (SWLS), and Empathy Understanding Questionnaire (KRE). Results: Attitudes towards people with disabilities people were generally positive. Almost 40% of respondents expressed a willingness to help for people with disabilities. In general, disabled people do not have full access to all fields of social (63.4%) and professional (63.2%) life. At the same time, disabled people tend to marry (84.9%), have children (82.1%), work (88.2%), and drive cars (76.1%). Respondents were convinced that contact with a disabled person teaches ways to help others (42.1%), and in fact 58.6% of respondents reported having decided to participate with helping the disabled. The average life satisfaction of the students was 22.7 ± 5.3 which indicates that the respondents are satisfied with their lives. The empathy level of respondents was 66.97 points ± 2.98, which indicates average level of empathy. Conclusions: This study shows that students’ perception of people with disabilities depends upon how the students viewed disabled people’s, life satisfaction and empathy.
    Źródło:
    Progress in Health Sciences; 2016, 6(2); 125-131
    2083-1617
    Pojawia się w:
    Progress in Health Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The perception of violence in children’s drawings
    Autorzy:
    Krajewska-Kułak, E.
    Kułak, W.
    Stelcer, B.
    Jasiński, M.
    Kowalczuk, K.
    Łukaszuk, C.
    Guzowski, A.
    Cybulski, M.
    Lewko, J.
    Van Damme-Ostapowicz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1917749.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Medyczny w Białymstoku
    Tematy:
    Violence
    drawings
    children
    adolescents
    Opis:
    The aim of the paper is to evaluate the perception of violence held by children and adolescents aged 8 to 16 years based on their artworks. 163 children’s drawings submitted from across Poland on "Children against violence." were analyzed. These pictures were analysed according to their contents. The artworks were made using various techniques: torn paper collage, collage, wax scratch, coloring pages, painting using poster paints and watercolors. Drawings have been classified in twelve thematic groups: "aggression against things", "peer violence","violence and addiction", "family violence", "workplace violence", "on-line violence," verbal violence", the continuity of violence", difficult choices" ,and " help ". Children and adolescents are good observers and they see various forms of violence, especially signs of bullying, and the impact of addictions on their development. Children know how to avoid and reduce violence.
    Źródło:
    Progress in Health Sciences; 2016, 6(1); 78-85
    2083-1617
    Pojawia się w:
    Progress in Health Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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