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3. Surface properties of POSS nanocomposites

Author

Murariu, Mioara, primary, Oancea, Andrei-Victor, additional, Ursu, Cristian, additional, Rusu, Bogdan George, additional, Cotofana, Corneliu, additional, Simionescu, Bogdana, additional, and Olaru, Mihaela, additional

Published
2021
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4. Contributors

Author

Akpinar, Serkan, primary, Alagar, M., additional, Anil Kumar, S., additional, Aytac, Ayse, additional, Bekin Acar, Seda, additional, Çakmakçi, Emrah, additional, Celik Kucuk, Asuman, additional, Chen, Mi, additional, Cheng, Wei, additional, Chua, Ming Hui, additional, Chung, Tai-Shung, additional, Cotofana, Corneliu, additional, Dehghani, Mostafa, additional, Devaraju, S., additional, Hazer, Seda, additional, Hemmati, Alireza, additional, Kabra, Shruti, additional, Kalarikkal, Nandakumar, additional, Kandasubramanian, Balasubramanian, additional, Kausar, Ayesha, additional, Kodal, Mehmet, additional, Le, Ngoc Lieu, additional, Lei, Bo, additional, Leng, Tongtong, additional, Luo, Meng, additional, Mesbah, Mohammad, additional, Mohseni, Mohsen, additional, Mondal, Prantik, additional, Murariu, Mioara, additional, Niu, Wen, additional, Nosar, Mahdi Naseri, additional, Oancea, Andrei-Victor, additional, Olaru, Mihaela, additional, Ozdogan, Reyhan, additional, Ozkoc, Guralp, additional, Pazirofteh, Mahdieh, additional, Ponnupandian, Siva, additional, Rao, YuanQiao, additional, Raut, Sagar Kumar, additional, Rezakazemi, Mashallah, additional, Rhee, Hee-Woo, additional, Romo-Uribe, Angel, additional, Rusu, Bogdan George, additional, Saha, Biswadeep, additional, Sarkar, Biswajit, additional, Sharma, Amit K., additional, Simionescu, Bogdana, additional, Singh, Rahul, additional, Singha, Nikhil K., additional, Somasekharan, Lakshmipriya, additional, Stephen, Ranimol, additional, Swapna, V.P., additional, Tandon, Saloni, additional, Tasdelen, Mehmet Atilla, additional, Thomas, Sabu, additional, Ullah, Muhammad Saeed, additional, Ursu, Cristian, additional, Wang, Min, additional, Wang, Yidan, additional, Wiggins, Jeffrey S., additional, Xie, Chenxi, additional, Xu, Jianwei, additional, Yahyaei, Hossein, additional, Yong, Wai Fen, additional, Zaharescu, Traian, additional, and Zhou, Hui, additional

Published
2021
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8. Îngrijirea paliativă în bolile respiratorii cronice non-oncologice: managementul dispneei.

Author

Sturz, Fabiola-Monica, Cojan-Mînzat, Bianca-Olivia, Sorina, Rodica, Ursu, Ştefan, Ursu, Cristian Paula, and Puia, Aida

Abstract

Copyright of Romanian Journal of Family Medicine / Revista Română de Medicina Familiei is the property of Media DOM Express and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2023

12. Long-range oscillations of a laser-produced carbon plasma recorded by an electrostatic energy analyzer.

Author

Nica, Petru-Edward, Ursu, Cristian, and Focsa, Cristian

Subjects
*LASER plasmas, *ELECTROSTATIC analyzers, *LASER ablation, *CHARGE carriers, *OSCILLATIONS, *RUTHERFORD backscattering spectrometry
Abstract

Understanding peculiar dynamics in transient laser-produced plasmas is of great importance for a number of applications such as energetic ion production, ion implantation, laser micro-machining, etc. Continuing a series of papers on the electrical and optical characterization of laser ablation plasma plumes, we report here on the observation of oscillations in the ionic and electronic currents at a long distance (17.5 cm) from the ablation target. An electrostatic energy analyzer was used to finely probe the dynamics of charge carriers in a carbon plasma generated in vacuum by KrF excimer laser ablation of a graphite target. A short-time Fourier transform data processing approach was applied to extract valuable information from the recorded currents. This method not only reveals different frequencies for two distinct expanding plasma structures, but also unveils different trends in their temporal evolution. These new experimental results corroborate previous studies supporting a scenario based on the plasma structuring in multiple double layers. A discussion with respect to an alternative scenario based on low-frequency sheath instabilities is also presented. [ABSTRACT FROM AUTHOR]

Published
2021
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19. Full silicone interpenetrating bi-networks with different organic groups attached to the silicon atoms

Author

Tugui Codrin, Cazacu Maria, Sacarescu Liviu, Bele Adrian, Stiubianu George, Ursu Cristian, and Racles Carmen

Abstract

Mixed silicone interpenetrating networks have been prepared using two groups of siloxane polymers and copolymers as precursors in different combinations. Each combination chosen, after a good mixing in solution with cross-linking agents was processed into film, which has been stabilized through sequential crosslinking using separate chemical pathways: condensation with tetraethyl orthosilicate at room temperature for the first network and addition (hydrosilylation) at higher temperatures in the case of the second one. The morphology of the resulted materials was studied by scanning electron microscopy (SEM). The mixing degrees of the two networks were estimated on the basis of the differential scanning calorimetry (DSC) traces as well as by small angle X-ray scattering (SAXS). The obtained films were characterized from point of view of the properties of interest for electromechanical applications by mechanical testing, dielectric spectroscopy and electrical breakdown measurements. The influence of the nature and content of the polar groups attached on the silicon on these characteristics was discussed.

Published
2017
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20. Bimodal silicone interpenetrating networks sequentially built as electroactive dielectric elastomers

Author

Tugui Codrin, Stiubianu George, Iacob Mihail, Ursu Cristian, Bele Adrian, Vlad Stelian, and Cazacu Maria

Abstract

Two polysiloxanes, a polydimethylsiloxane-α,ω-diol (PDMS) with Mn = 370000 g mol−1, and α,ω-bis(vinyl)polydimethylsiloxane (Vi2PDMS) with Mn = 34500 g mol−1, and appropriate crosslinking systems for each of them (tetraethyl orthosilicate–dibutyltindilaurate and α,ω-bis(trimethylsiloxy)poly(dimethylmethyl-H-siloxane)–Speier's catalyst, respectively), were mixed together in various weight ratios (1:0.1, 1:0.2, 1:0.3, 1:0.5) and cast into films. These were sequentially crosslinked by different mechanisms. A determined pre-stretch was applied to the first network after its formation followed by thermal treatment for curing the second network. Non-prestreched networks were also prepared in parallel for comparison. The aged films were characterized from the point of view of the soluble fraction content, and analysed by differential scanning calorimetry, water vapour sorption in dynamic regime, dielectric spectroscopy and tensile tests. Dielectric strength and actuation strain were measured to estimate the suitability of the samples for electromechanical applications. The results revealed that through this approach one can relatively easily obtain very simple and homogeneous materials suitable for use as dielectric elastomer transducers.

Published
2015

21. Laser-BNSiO2 ceramic interactions in working Hall Effect Thruster: Experiment and Simulation

Author

Balika, Lahib, Focsa, Cristian, Ursu, Cristian, Gurlui, S., Pellerin, Stéphane, Pellerin, Nadia, Freyssengas, Vincent, Dudeck, Michel, Groupe de recherches sur l'énergétique des milieux ionisés (GREMI), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Conditions Extrêmes et Matériaux : Haute Température et Irradiation (CEMHTI), Université d'Orléans (UO)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Alexandru Ioan Cuza University of Iași [Romania], Institut Jean le Rond d'Alembert (DALEMBERT), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)

Subjects
[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph]
Abstract

[Thème 4 : Plasma and laser processing] Communication orale (L.Balika); International audience

Published
2010

22. Energy Deposition on the surface of Hall Effect Thrusters for satellites - Simulation by laser beam

Author

Focsa, Cristian, Ursu, Cristian, Gurlui, S., Balika, Lahib, Pellerin, Stéphane, Pellerin, Nadia, Pagnon, Daniel, Dudeck, Michel, Freyssengas, Vincent, Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Alexandru Ioan Cuza University of Iași [Romania], Groupe de recherches sur l'énergétique des milieux ionisés (GREMI), Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO), Conditions Extrêmes et Matériaux : Haute Température et Irradiation (CEMHTI), Université d'Orléans (UO)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique des gaz et des plasmas (LPGP), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Institut Jean le Rond d'Alembert (DALEMBERT), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), and Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], ComputingMethodologies_GENERAL, ComputingMilieux_MISCELLANEOUS
Abstract

Poster; International audience

Published
2009

23. Laser-BNSiO2 Ceramics Interaction: simulation of the energy deposition on dielectric wall surfaces in Hall thrusters

Author

Focsa, Cristian, Ziskind, Michael, Ursu, Cristian, Gurlui, S., Pagnon, Daniel, Pellerin, Stéphane, Pellerin, Nadia, Dudeck, Michel, Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Faculty of Physics - 'Al. I. Cuza', Universitatea 'Al. I. Cuza', Laboratoire de physique des gaz et des plasmas (LPGP), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Analyse Spectroscopique et d'Energétique des Plasmas (LASEP - EA3269), Université d'Orléans (UO), Conditions Extrêmes et Matériaux : Haute Température et Irradiation (CEMHTI), Université d'Orléans (UO)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut Jean le Rond d'Alembert (DALEMBERT), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Ceramics, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], BNSiO2, Hall thrusters, Simulation, Laser interaction
Abstract

International audience; The dielectric wall surfaces of the annular chamber which are used in Hall Effect Thrusters (HET) to limit the plasma discharge play an important role but yet completely not understood and controlled. In order to investigate the effect of an energy flux on the wall we performed tests with a nanosecond pulsed laser to simulate the energy deposition on BNSiO2 (usual dielectric material for HETs). The tests have been carried out with the second harmonic (532 nm) of a Q-switched (10 ns) Nd:YAG laser focused on the samples placed in a vacuum chamber (10-6 Torr). The energy/pulse range explored has been 5 – 320 mJ, leading to fluences of 1 – 1000 J/cm2. The modifications induced by laser irradiation on the BNSiO2 targets have been analysed by profilometry and scanning electron microscopy. The plasma created by laser ablation has also been characterized by optical and spectral methods. The present paper presents preliminary results of these combined investigations.

Published
2008

24. Laser-BNSiO2 interaction: simulation of energy deposition on dielectric wall surface in Hall thrusters

Author

Focsa, Cristian, Ziskind, Michael, Ursu, Cristian, Gurlui, S., Pagnon, Daniel, Pellerin, Stéphane, Pellerin, Nadia, Dudeck, Michel, Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Alexandru Ioan Cuza University of Iași [Romania], Laboratoire de physique des gaz et des plasmas (LPGP), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Analyse Spectroscopique et d'Energétique des Plasmas (LASEP - EA3269), Université d'Orléans (UO), Conditions Extrêmes et Matériaux : Haute Température et Irradiation (CEMHTI), Université d'Orléans (UO)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut Jean le Rond d'Alembert (DALEMBERT), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], ComputingMethodologies_GENERAL, ComputingMilieux_MISCELLANEOUS
Abstract

Poster; International audience

Published
2007

30. Corpus linguistics and South Asian languages : corpus creation and tool development.

Author

Baker, Paul, Hardie, Andrew, McEnery, Tony, Xiao, Richard Z., Bontcheva, Kalina, Cunningham, Hamish, Gaizauskas, Robert, Hamza, Oana, Maynard, Diana, Tablan, Valentin, Ursu, Cristian, Jayaram, B. D., Leisher, Mark, Baker, Paul, Hardie, Andrew, McEnery, Tony, Xiao, Richard Z., Bontcheva, Kalina, Cunningham, Hamish, Gaizauskas, Robert, Hamza, Oana, Maynard, Diana, Tablan, Valentin, Ursu, Cristian, Jayaram, B. D., and Leisher, Mark

Abstract

This paper describes the work carried out on the EMILLE Project (Enabling Minority Language Engineering), which was undertaken by the Universities of Lancaster and Sheffield. The primary resource developed by the project is the EMILLE Corpus, which consists of a series of monolingual corpora for fourteen South Asian languages, totalling more than 96 million words, and a parallel corpus of English and five of these languages. The EMILLE Corpus also includes an annotated component, namely, part-of-speech tagged Urdu data, together with twenty written Hindi corpus files annotated to show the nature of demonstrative use in Hindi. In addition, the project has had to address a number of issues related to establishing a language engineering (LE) environment for South Asian language processing, such as translating 8-bit language data into Unicode and producing a number of basic LE tools. The development of tools for EMILLE has contributed to the ongoing development of the LE architecture GATE, which has been extended to make use of Unicode. GATE thus plugs some of the gaps for language processing R&D necessary for the exploitation of the EMILLE corpora.

Published
2004

31. Functional silsesquioxane-based hierarchical assemblies for antibacterial/antifungal coatings.

Author

Bordianu, Irina-Elena, David, Geta, Simionescu, Bogdana, Aflori, Magdalena, Ursu, Cristian, Coroaba, Adina, Hitruc, Gabriela, Cotofana, Corneliu, and Olaru, Mihaela

Abstract

This paper reports the first study on functional silsesquioxane-based hierarchical assemblies containing an ordered distribution of silver nanoparticles with a large number of {111} facets, obtained through sol–gel reaction, intended for antibacterial/antifungal coatings. [ABSTRACT FROM AUTHOR]

Published
2015
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