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    Wyświetlanie 1-10 z 10
    Tytuł:
    Solvation of Alcohols in n-Heptane and n-Propanol from the Acoustic Passynski Method
    Autorzy:
    Gliński, J.
    Burakowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811514.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.35.Bf
    43.35.+d
    61.20.-p
    61.20.Qg
    Opis:
    The method of Passynski of calculating the solvation numbers from compressibility was applied to solutions of short-chained normal alcohols in n-heptane and n-propanol. The dependences of solvation numbers on length of the solute molecules are surprisingly similar for both solvents. Applicability of the acoustic method for determining the solvation numbers in nonaquous systems, as well as for investigation of intermolecular interactions in them was proved. Some structural similarity of associated alcohol and hydrocarbon in liquid state is suggested.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6A; A-109-A-113
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydration of the Zwitterionic Forms οf Amino Acids from the Acoustic Passynski Method
    Autorzy:
    Burakowski, A.
    Gliński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811531.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.35.Bf
    43.35.+d
    61.20.-p
    61.20.Qg
    Opis:
    In this communication, we report the compressibility measurements made on amino acids in water at 25°C, compared with aqueous short-chained amines and carboxylic acids. The effect of the charge caused by protonation of the amino group and/or deprotonation of the carboxylic one was tested. The concept of additivity of the hydration number with the constituents of solute molecule was applied and discussed.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6A; A-39-A-44
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positron annihilation and speed of sound in the systems containing beta-cyclodextrin
    Autorzy:
    Jerie, K.
    Baranowski, A.
    Burakowski, A.
    Gliński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146303.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    sound speed
    compressibility
    positron annihilation
    cyclodextrin
    alcohol
    inclusion compounds
    Opis:
    Positron annihilation measurements were performed in aqueous solutions of beta-cyclodextrin, as well as in solid mixtures of this sugar with a long-chained alcohol, n-nonanol. Additionally, acoustic (sound speed, density and compressibility) experiments were done in aqueous beta-cyclodextrin and tert-butanol systems and in a three-component water-beta-cyclodextrin-tert-butanol system. The results show that in aqueous solution cyclodextrin does not form inclusive complexes with alcohol, while solid sugar-alcohol mixtures undergo slow changes in time, most probably caused by exchange of guest between interior and exterior of the host molecule.
    Źródło:
    Nukleonika; 2010, 55, 1; 65-68
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure of Aqueous Solutions of Acetonitrile Investigated by Acoustic and Positron Annihilation Measurements
    Autorzy:
    Jerie, K.
    Baranowski, A.
    Koziol, S.
    Gliński, J.
    Burakowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043335.pdf
    Data publikacji:
    2005-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.25.Em
    78.70.Bj
    Opis:
    We report the results of acoustic and positron annihilation measurements in aqueous solutions of acetonitrile (CH$\text{}_{3}$CN). Hydrophobicity of the solute is discussed, as well as the possibility of describing the title system in terms of hydrophobic solvation. The concept of Levay et al. of calculating the "ideal positronium lifetimes is applied, basing on the mean volume of cavities (holes) in liquid structure available for positronium pseudoatom. The same calculations performed using the Tao model of annihilation yield very different results. It can be concluded that either acetonitrile forms with water clathrate-like hydrates of untypical architecture, or it is too weak hydrophobic agent to form clathrate-like hydrates at all. The former interpretation seems to be more probable.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 5; 826-831
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Sol-Gel Glasses Doped with Lanthanide Ions by Spectroscopic, Acoustic, and Positron Annihilation Methods
    Autorzy:
    Jerie, K.
    Baranowski, A.
    Legendziewicz, J.
    Guzik, M.
    Burakowski, A.
    Gliński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047126.pdf
    Data publikacji:
    2006-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.30.Jc
    43.35.Cg
    61.20.Qg
    61.25.Em
    62.60.+v
    78.70.Bj
    Opis:
    The results of optical spectroscopic (UV-Vis, absorption, and emission), acoustic (sound velocity of precursor solutions, the solvation numbers of ions in these solutions), and positron annihilation of glasses are presented and discussed for silica glasses obtained by the alcoholic sol-gel technique, doped with selected lanthanides and with some addition of ethylene glycol. The aim of these investigations was the determination of the local structure of glass close to lanthanide ions and its influence on the optical properties of the material. The results show that the existence of alcohol-glycol solvates in glasses decrease the number of empty voids in its structure as well as the size of the remaining ones. One can suppose that this is caused by cooperative interactions of glycol molecules with the network of hydrogen bonds of the glass.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 5; 583-591
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comparison of ATM and IP QoS network capabilities for handling LAN traffic with QoS differentiation
    Autorzy:
    Bęben, A.
    Burakowski, W.
    Pyda, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/309369.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    traffic control
    IP QoS
    asynchronous transfer mode
    Opis:
    Now, a network operator must choose between two packet switched technologies for providing QoS in WAN networks, which are ATM and IP QoS [3, 4, 9]. As ATM has reached the maturity with capabilities for offering a number of different network services (i.e. CBR, VBR, ABR, UBR, GFR), the IP QoS with network services like expedited forwarding, assured forwarding, etc. is still at developing phase but never-theless is commonly regarded as capable to guarantee in near future similar QoS level as ATM. This paper tries to compare the efficiency of the mentioned technologies (in case of IP QoS network the AQUILA network concept [1, 2] is investigated) for handling traffic generated by LANs with QoS differentiation. This is extremely required since the applications running in LAN differ in QoS requirements and emitted traffic profiles (streaming, elastic). Therefore, a classification process of outgoing LAN traffic into predefined sub-streams should be performed at the entry point to WAN network (edge ATM switch or IP router). Furthermore, particular sub-streams are submitted to adequate WAN network service, available in ATM or IP QoS. The paper presents the experimental results, measured in the test bed, corresponding to QoS level and QoS differentiation provided by ATM and IP QoS core.For this purpose, a set of representative applications currently available to a LAN user was selected demanding from the core different QoS level. They correspond to streaming applications like VoIP with QoS objectives represented mainly by packet delay characteristics and elastic applications controlled by TCP protocol with minimum guaranteed through-put/goodput as target.
    Źródło:
    Journal of Telecommunications and Information Technology; 2003, 4; 25-31
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On effectiveness of conditional admission control for IP QoS network services with REM scheme
    Autorzy:
    Dąbrowski, M.
    Burakowski, W.
    Bęben, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/309267.pdf
    Data publikacji:
    2002
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    QoS IP network
    conditional admission control
    Opis:
    Future IP QoS (quality of service) networks are aiming at differentiating transfer quality of packets belonging to different flows. For this purpose, a set of network services (NS) with different QoS objectives is defined and implemented in the network. To a NS a certain amount of network resources, i.e. dedicated link capacity with associated buffer size, is allocated. Moreover, the resources dedicated for one NS are not available for other NSs. Traditional approach for admission control algorithm corresponding to given NS takes into account current traffic conditions inside considered NS. This can lead to the situation, due to traffic fluctuations, that temporary overloaded NS cannot use the spare bandwidth from underloaded in this time other NSs. This paper describes a conditional admission control algorithm (C-AC), allowing us to admit new packet flow conditionally in the case where no available capacity inside a given NS. For conditionally accepted flow currently unused capacity, dedicated to other NS, is allocated. This can be done only in the case when QoS requirements for both the conditionally accepted flow and the flows in progress are satisfied. The conditions for effective using of C-AC algorithm are discussed in the paper, like characteristics of NS borrowing and lending capacity and their current traffic load. To show potential benefits of the approach, exemplary numerical results are included, corresponding to hypothetical NSs using REM (rate envelope multiplexing) scheme.
    Źródło:
    Journal of Telecommunications and Information Technology; 2002, 2; 33-39
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    AQUILA network architecture: first trial experiments
    Autorzy:
    Bąk, A.
    Bęben, A.
    Burakowski, W.
    Dąbrowski, M.
    Fudała, M.
    Tarasiuk, H.
    Kopertowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/309191.pdf
    Data publikacji:
    2002
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    IP QoS
    pomiary
    measurements
    Opis:
    The paper presents trial experiments with IP QoS network services (NS) defined and implemented in the AQUILA pilot installation. The AQUILA NSs (premium CBR, premium VBR, premium multimedia and premium mission critical) provide a framework for supporting a variety of applications generating both streaming and elastic traffic. The measurement experiments confirm that AQUILA architecture differentiates the QoS offered to these NSs. The presented numerical results were obtained in the test network installed in the Polish Telecom (Warsaw) consisting of 8 CISCO routers.
    Źródło:
    Journal of Telecommunications and Information Technology; 2002, 2; 3-13
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The IP QoS System
    Autorzy:
    Burakowski, W.
    Śliwiński, J.
    Tarasiuk, H.
    Bęben, A.
    Niewiadomska-Szynkiewicz, E.
    Pyda, P.
    Mongay Batalla, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/307862.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    classes of service
    DiffServ architecture
    multi-service networks
    NGN architecture
    quality of service
    Opis:
    This paper shortly describes the IP QoS System which offers strict quality of service (QoS) guarantees in IP-based networks and supports a number of, so called, classes of services. Such solution requires to implement in the network a set of QoS mechanisms and algorithm working on packet, connection request and provisioning levels. Furthermore, we require signaling system for informing the network about new connection request and network resource allocation capabilities for providing required resources to given connection. The IP QoS System is based on the next generation networks (NGN) and differentiated services (DiffServ) architectures and, at least for now, it is designed for single domain only.
    Źródło:
    Journal of Telecommunications and Information Technology; 2011, 3; 5-11
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Why is IPv6 Deployment Important for the Internet Evolution?
    Autorzy:
    Batalla, J. M.
    Binczewski, A.
    Burakowski, W.
    Chudzik, K.
    Gajda, B.
    Gajewski, M.
    Grzech, A.
    Krawiec, P.
    Kwiatkowski, J.
    Mrugalski, T.
    Nowicki, K.
    Procyk, W.
    Sienkiewicz, K.
    Szuman, R.
    Śliwiński, J.
    Światowiak, J.
    Wiśniewski, P.
    Woźniak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/309546.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    Internet evolution
    IPv6
    migration
    mobility
    Next Generation Internet
    research
    Opis:
    Replacing the IPv4 protocol with IPv6 on the Internet is currently one of the aims of the European Union policy. The main reason for this replacement is the effeteness of the addresses pool in the IPv4 protocol, which can cause serious complications in the evolution of the Internet and its adaptation in new areas, e.g., in next generation mobile telephony or the so called Internet of Things. Simultaneously, the addressing capabilities of the IPv6 protocol are practically unlimited and its new functionalities increase the attractiveness of its usage. The article discusses the problems connected with the IPv6 deployment on the Internet. Especially, the rules for realization of the IPv6 deployment and rules for cooperation of IPv4 with IPv6 (including cooperation tests) in network infrastructure and in applications are presented. Moreover, the European projects' results and the activity's directions of the national project Future Internet Engineering are discussed.
    Źródło:
    Journal of Telecommunications and Information Technology; 2011, 2; 5-15
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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