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186 results on '"Panopoulos, N."'

1. Ultrafast stratified diffusion of water inside carbon nanotubes. Direct experimental evidence with 2D (D-T2) NMR spectroscopy

Author

Hassan, J., Diamantopoulos, G., Gkoura, L., Karayanni, M., Alhassan, S., Kumar, S. V., Katsiotis, M. S., Karagiannis, T., Fardis, M., Panopoulos, N., Kim, H. J., Katsioti, M., and Papavassiliou, G.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Soft Condensed Matter
Abstract

Water, when confined at the nanoscale acquires extraordinary transport properties. And yet there is no direct experimental evidence of these properties at nanoscale resolution. Here, by using 2D NMR diffusion-relaxation (D-T2) and spin-lattice - spin-spin relaxation (T1-T2) spectroscopy, we succeeded to resolve at the nanoscale water diffusion in single and double-walled carbon nanotubes (SWCNT/DWCNT). In SWCNTs, spectra display the characteristic shape of uniform water diffusion restricted in one dimension. Remarkably, in DWCNTs water is shown to split into two axial components with the inner one acquiring unusual flow properties: high fragility, ultrafast self-diffusion coefficient, and "rigid" molecular environment, revealing a stratified cooperative motion mechanism to underlie fast diffusion in water saturated CNTs., Comment: Article: 6 pages, 5 figures. Submitted to PNAS. Supporting Information request at: g.papavassiliou@inn.demokritos.gr

Published
2016

6. 139La NMR evidence for phase solitons in the ground state of overdoped manganites

Author

Koumoulis, D., Panopoulos, N., Reyes, A., Fardis, M., Pissas, M., Douvalis, A., Bakas, T., Argyriou, D., and Papavassiliou, G.

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

Hole doped transition metal oxides are famous due to their extraordinary charge transport properties, such as high temperature superconductivity (cuprates) and colossal magnetoresistance (manganites). Astonishing, the mother system of these compounds is a Mott insulator, whereas important role in the establishment of the metallic or superconducting state is played by the way that holes are self-organized with doping. Experiments have shown that by adding holes the insulating phase breaks into antiferromagnetic (AFM) regions, which are separated by hole rich clumps (stripes) with a rapid change of the phase of the background spins and orbitals. However, recent experiments in overdoped manganites of the La(1-x)Ca(x)MnO(3) (LCMO) family have shown that instead of charge stripes, charge in these systems is organized in a uniform charge density wave (CDW). Besides, recent theoretical works predicted that the ground state is inhomogeneously modulated by orbital and charge solitons, i.e. narrow regions carrying charge (+/-)e/2, where the orbital arrangement varies very rapidly. So far, this has been only a theoretical prediction. Here, by using 139La Nuclear Magnetic Resonance (NMR) we provide direct evidence that the ground state of overdoped LCMO is indeed solitonic. By lowering temperature the narrow NMR spectra observed in the AFM phase are shown to wipe out, while for T<30K a very broad spectrum reappears, characteristic of an incommensurate (IC) charge and spin modulation. Remarkably, by further decreasing temperature, a relatively narrow feature emerges from the broad IC NMR signal, manifesting the formation of a solitonic modulation as T->0., Comment: 5 pages, 4 figures

Published
2009
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7. Spin order and lattice frustration in optimally doped manganites. A high temperature NMR study.

Author

Panopoulos, N., Koumoulis, D., Diamantopoulos, G., Belesi, M., Fardis, M., Pissas, M., and Papavassiliou, G.

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

The physics underlying the complex glassy phenomena, which accompany the formation of polarons in optimally doped manganites (ODM) is a cumbersome issue with many unexplained aspects. In this article we present $^{139}$La and $^{55}$Mn NMR in the temperature range 80K - 900K of ODM La$_{0.67}$Ca$_{0.33}$MnO$_3$. We show that local lattice distortions, established in the Paramagnetic (PM) phase for $T<700$K, induce a genuine spin-glass state, which for $T

Published
2009
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9. Detection of Weyl fermions and the metal to Weyl-semimetal phase transition in WTe2 via broadband high resolution NMR

Author

Papawassiliou, W., primary, Carvalho, J. P., additional, Kim, H. J., additional, Kim, C. Y., additional, Yoo, S. J., additional, Lee, J. B., additional, Alhassan, S., additional, Orfanidis, S., additional, Psycharis, V., additional, Karagianni, M., additional, Fardis, M., additional, Panopoulos, N., additional, Papavassiliou, G., additional, and Pell, A. J., additional

Published
2022
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11. Detection of Weyl fermions and the metal to Weyl-semimetal phase transition in WTe2via broadband high resolution NMR

Author

Papawassiliou, Wassilios, Carvalho, José P., Kim, H. J., Kim, C. Y., Yoo, S. J., Lee, J. B., Alhassan, S., Orfanidis, S., Psycharis, V., Karagianni, M., Fardis, M., Panopoulos, N., Papavassiliou, G., Pell, A. J., Papawassiliou, Wassilios, Carvalho, José P., Kim, H. J., Kim, C. Y., Yoo, S. J., Lee, J. B., Alhassan, S., Orfanidis, S., Psycharis, V., Karagianni, M., Fardis, M., Panopoulos, N., Papavassiliou, G., and Pell, A. J.

Abstract

Weyl fermions (WFs) in the type-II Weyl semimetal (WSM) WTe2 are difficult to resolve experimentally because the Weyl bands disperse in an extremely narrow region of the (E−k) space. Here, by using DFT-assisted high-resolution 125Te solid-state nuclear magnetic resonance (ssNMR) in the temperature range 50–700 K, we succeeded in detecting low energy WF excitations and monitoring their evolution with temperature. Remarkably, WFs are observed to emerge at T∼120 K, while at lower temperatures WTe2 behaves as a trivial metal. This intriguing phenomenon is induced by the rapid raise of the Fermi level upon heating, which crosses the Weyl bands only for T>120 K. The abrupt change of the NMR parameters at this temperature is signature of a topological Lifshitz transition instead of a cursive energy-bands crossing.

Published
2022
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13. Manufacturing personnel task allocation taking into consideration skills and remote guidance based on augmented reality and intelligent decision making.

Author

Mourtzis, D., Angelopoulos, J., and Panopoulos, N.

Subjects
AUGMENTED reality, DECISION making, INDUSTRY 4.0, HUMAN resources departments, NUMERICAL control of machine tools, INTELLIGENT transportation systems, INTELLIGENT tutoring systems, COMPUTER assisted instruction
Abstract

In the realm of the fourth industrial revolution, the flawless and continuous operation of the technology-rich workplaces is a challenging problem. The assessment of technician skills could facilitate initially the personnel classification, and in continuation the adaptation of guidance instructions as well as the job allocation to their unique attributes. Hence, this paper presents the design and development of a tool for assessing human resources skills, job allocation and task-related support based on intelligent decision making and augmented reality (AR). Finally, the developed framework is validated in a real industrial case study of a CNC machine manufacturer. [ABSTRACT FROM AUTHOR]

Published
2023
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21. A survey of digital B2B platforms and marketplaces for purchasing industrial product service systems: A conceptual framework.

Author

Mourtzis, D., Angelopoulos, J., and Panopoulos, N.

Abstract

The shift of profit margins from products to services, has transformed traditional production equipment supplier industries to providers of Industrial Product-Service Systems (IPSS). IPSS is a new business model for consistent delivery of industrial products such as production equipment and manufacturing services (Manufacturing as a Service). However, procurement of IPSS between industrial companies (i.e. Business-to-Business - B2B) is more complicated compared to the case of products offered to consumers (i.e. Business-to-Consumer – B2C). The complexity in interaction between the involved B2B stakeholders, the lack of trust and high costs especially for Small Medium Enterprises have hampered the establishment of standardized e-marketplaces in a similar manner as in the business to consumer world. This research work presents an overview on the requirements to support supply-chain processes on a digital B2B platform as well as a discussion of the objectives and the benefits of this multi-sided platform. [ABSTRACT FROM AUTHOR]

Published
2020
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22. An intelligent model for workforce allocation taking into consideration the operator skills.

Author

Mourtzis, D., Siatras, V., Angelopoulos, J., and Panopoulos, N.

Abstract

The evolution of production systems encloses continuous adaptation of workplaces with changing levels of technologies and automation. This research paper examines scenarios of multi-skilled operators, cooperating to accomplish a common goal. The under-consideration environment consists of a distributed network of workstations, each one assigned with a set of pending jobs. Therefore, the production engineer faces the challenging task of job allocation to suitable operators and appropriate workstations. As such, the formulation of the problem is based on the evaluation of each individual operator's job-related skills and the provision of an intelligent decision-making algorithm for the human resources allocation. The framework addresses the optimization of the allocated operators-jobs correlation and the workforce cost as the model's decision criteria. The model was implemented in a cross-platform planning application and tested in a real-life industrial scenario. [ABSTRACT FROM AUTHOR]

Published
2020
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23. Ultrafast Stratified Diffusion of Water Inside Carbon Nanotubes; Direct Experimental Evidence with 2D D–T2 NMR Spectroscopy

Author

Hassan, J., primary, Diamantopoulos, G., additional, Gkoura, L., additional, Karagianni, M., additional, Alhassan, S., additional, Kumar, S. V., additional, Katsiotis, M. S., additional, Karagiannis, T., additional, Fardis, M., additional, Panopoulos, N., additional, Kim, H. J., additional, Beazi-Katsioti, M., additional, and Papavassiliou, G., additional

Published
2018
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29. Pipelines for New Chemicals: A strategy to create new value chains and stimulate innovation-based economic revival in Southern European countries

Author

Timmis, K. de Lorenzo, V. Verstraete, W. Garcia, J.L. Ramos, J.L. Santos, H. Economidis, I. Nogales, B. Timmis, J.K. Fonseca, C. Pruzzo, C. Karagouni, A. Panopoulos, N. Dixon, B.

Abstract

Countries of Southern Europe are currently suffering from severe socio-economic pain resulting from high debt levels and austerity measures which constrain investment in innovation-based recovery strategies that are essential for entry into a long-term sustainable period of increasing employment and wealth creation. Young university-educated people are particularly innovative, and hence vital to the development of such strategies, but employment opportunities are poor and many are forced to seek employment that neither profits from their training nor satisfies their justified career expectations, or to emigrate. They are the 'lost generation'. A strategy is proposed here for the creation of Pipelines for New Chemicals, national centre-network partnerships for the discovery-synthesis of new chemicals obtained though harvesting new biological diversity, and their exploitation to develop new medicines, agrochemicals, materials, and other products and applications. The goal is to create new regional motors of economic growth and development, by harnessing the knowledge, motivation and innovation potential of the excellently educated young people of Europe to catalyse the development of new small, medium and large enterprises centred around novel chemicals, and the value chains that will evolve with them, and thereby develop a powerful sector of sustainable growth in employment and social and economic prosperity in Southern Europe. © 2014 Society for Applied Microbiology and John Wiley & Sons Ltd.

Published
2014

32. Plant pathogens, bacterial

Author

Tampakaki, A. P., Hatziloukas, E., and Panopoulos, N. J.

Abstract

655 - 677 σ. Encyclopedia of microbiology

Published
2009

33. Safety and efficacy of Danisco Xylanase G/L (endo-1,4-beta-xylanase) as a feed additive for chickens for fattening, laying hens and ducks for fattening. Scientific Opinion of the Panel on Additives and Products or Substances used in Animal Feed and of the Panel on Genetically Modified Organisms:(Question No EFSA-Q-2006-137)

Author

Bories, G., Brantom, P., Brufau de Barberá, J., Chesson, A, Cocconcelli, P. S., Debski, B., Dierick, N., Franklin, A., Gropp, J., Halle, I., Hogstrand, C., de Knecht, J., Leng, L., Haldorsen, A.-K. L., Mantovani, A., Mézes, M., Nebbia, C., Rambeck, W., Rychen, G., von Wright, A., Wester, P., Andersson, H. C., Arpaia, S., Bartsch, D., Casacuberta, J., Davies, H., De Loose, M., Hendriksen, N. B., Herman, L., Kärenlampi, S., Kiss, J., Kryspin-Sørensen, I., Kuiper, H. A., Nes, I., Panopoulos, N., Perry, J., Pöting, A., Schiemann, J., Seinen, W., Sweet, J. B., and Wal, J. M.

Published
2007

35. Opinion of the Scientific Panel on Genetically Modified Organisms on an application (Reference EFSA-GMO-NL-2005-18) for the placing on the market of the glufosinate tolerant soybean A2704-12, for food and feed uses, import and processing under Regulation (EC) No 1829/2003 from Bayer CropScience:(Question No EFSA-Q-2005-174)

Author

Andersson, H. C., Arpaia, S., Bartsch, D., Casacuberta, J., Davies, H., Einspanier, R., Herman, L., De Loose, M., Hendriksen, N. B., Kärenlampi, S., Kiss, J., Kryspin-Sørensen, I., Kuiper, H., Nes, I., Panopoulos, N., Perry, J., Pöting, A., Schiemann, J., Seinen, W., Sweet, J., and Wal, J-M.

Published
2007

36. Opinion of the Scientific Panel on genetically Modified Organisms on an application (Reference EFSA-GMO-NL-2005-12) for the placing on the market of insect-resistant genetically modified maize 59122, for food and feed uses, import and processing under Regulation (EC) No 1829/2003, from Pioneer Hi-Bred International, Inc. and Mycogen Seeds, c/o Dow Agrosciences LLC:(Question No EFSA-Q-2005-045)

Author

Andersson, H. C., Arpaia, S., Bartsch, D., Casacuberta, J., Davies, H., Herman, L., De Loose, M., Hendriksen, N. B., Kärenlampi, S., Kiss, J., Kryspin-Sørensen, I., Kuiper, H., Nes, I., Panopoulos, N., Perry, J., Pöting, A., Schiemann, J., Seinen, W., Sweet, J., and Wal, J.-M.

Published
2007

37. Opinion of the Scientific Panel on Additives and Products or Substances used in Animal Feed and the Scientific Panel on genetically Modified Organisms on the safety and efficacy of the enzyme preparation Rovabio TM PHY AP/LC (3-phytase) as feed additive for chickens for fattening, laying hens, piglets and pigs for fattening in accordance with Regulation (EC) No 1831/2003:(Question No EFSA-Q-2005-281)

Author

Bories, G., Brantom, P., Brufau de Barberá, J., Chesson, A, Cocconcelli, P. S., Debski, B., Dierick, N., Franklin, A., Gropp, J., Halle, I., Hogstrand, C., de Knecht, J., Leng, L., Haldorsen, A.-K. L., Mantovani, A., Mézes, M., Nebbia, C., Rambeck, W., Rychen, G., von Wright, A., Wester, P., Andersson, H. C., Arpaia, S., Bartsch, D., Casacuberta, J., Davies, H., De Loose, M., Einspanier, R., Hendriksen, N. B., Herman, L., Kärenlampi, S., Kiss, J., Kryspin-Sørensen, I., Kuiper, H. A., Nes, I., Panopoulos, N., Perry, J., Pöting, A., Schiemann, J., Seinen, W., Sweet, J. B., and Wal, J.-M.

Published
2007

45. Opinion of the Scientific Panel on Genetically Modified Organisms on an application (Reference EFSA-GMO-NL-2005-13) for the placing on the market of glufosinate-tolerant genetically modified LLCotton25, for food and feed uses, and import and processing under Regulation (EC) No 1829/2003 from Bayer CropScience:(Question No EFSA-Q-2005-047)

Author

Andersson, H. C., Arpaia, S., Bartsch, D., Casacuberta, J., Davies, H., Einspanier, R., Herman, L., De Loose, M., Hendriksen, N. B., Kärenlampi, S., Kiss, J., Kryspin-Sørensen, I., Kuiper, H., Nes, I., Panopoulos, N., Perry, J., Pöting, A., Schiemann, J., Seinen, W., Sweet, J., and Wal, J.-M.

Published
2006

46. Opinion of the Scientific Panel on Genetically Modified Organisms on an application (Reference EFSA-GMO-UK-2004-08) for the placing on the market of products produced from glyphosate-tolerant genetically modified sugar beet H7-1, for food and feed uses, under Regulation (EC) No 1829/2003 from KWS SAAT AG and Monsanto. (Question No EFSA-Q-2004-164)

Author

Andersson, H. C., Arpaia, S., Bartsch, D., Casacuberta, J., Davies, H., Einspanier, R., De Loose, M., Hendriksen, N. B., Herman, L., Kärenlampi, S. O., Kiss, J., Kryspin-Sørensen, I., Kuiper, H., Nes, I., Panopoulos, N., Perry, J., Pöting, A., Schiemann, J., Seinen, W., Sweet, J., and Wal, J.-M.

Published
2006

47. Guidance document of the Scientific Panel on Genetically Modified Organisms for renewal of authorisations of existing GMO products lawfully placed on the market, notified according to Articles 8 and 20 of regulation (EC) No 1829/2003. (Question No EFSA-Q-2003-005C)

Author

Andersson, H. C., Arpaia, S., Bartsch, D., Casacuberta, J., Davies, H., Einspanier, R., Herman, L., De Loose, M., Hendriksen, N. B., Kärenlampi, S., Kiss, J., Kryspin-Sørensen, I., Kuiper, H., Nes, I., Panopoulos, N., Perry, J., Pöting, A., Schienmann, J., Seinen, W., Sweet, J., and Wal, J.-M.

Published
2006

48. Guidance document of the Scientific Panel on Genetically Modified Organisms for renewal of authorisations of existing GMO products lawfully placed on the market, notified according to Articles 8 and 20 of Regulation (EC) No 1829/2003

Author

Andersson, H. C., Arpaia, S., Bartsch, D., Casacuberta, J., Davies, H., Einspanier, R., Herman, L., De Loose, M., Hendriksen, N. B., Kärenlampi, S., Kiss, J., Kryspin-Sørensen, I., Kuiper, H., Nes, I., Panopoulos, N., Perry, J., Pöting, A., Schiemann, J., Seinen, W., Sweet, J., and Wal, J. M.

Published
2006

50. Type III protein translocase: HrcN is a peripheral ATPase that is activated by oligomerization

Author

Pozidis, C., Chalkiadaki, A., Gomez-Serrano, A., Stahlberg, H., Brown, I., Tampakaki, A. P., Lustig, A., Sianidis, G., Politou, A. S., Engel, A., Panopoulos, N. J., Mansfield, J., Pugsley, A. P., Karamanou, S., and Economou, A.

Subjects
Protein Folding, Protein Conformation, Molecular Sequence Data, Bacterial Proteins/*chemistry, Protein Structure, Secondary, Amino Acid Sequence, Pseudomonas/*enzymology, Ions, Chromatography, Membrane Transport Proteins/*chemistry/*physiology, Water/metabolism, Dose-Response Relationship, Drug, Circular Dichroism, Hydrolysis, Temperature, Hydrogen-Ion Concentration, Plasmids/metabolism, Cross-Linking Reagents/pharmacology, Protein Structure, Tertiary, Kinetics, Microscopy, Electron, Protein Transport, Detergents/pharmacology, Cell Membrane/enzymology/metabolism, Escherichia coli/metabolism, Adenosine Triphosphatases/*chemistry/*physiology, Subcellular Fractions
Abstract

Type III protein secretion (TTS) is catalyzed by translocases that span both membranes of Gram-negative bacteria. A hydrophilic TTS component homologous to F1/V1-ATPases is ubiquitous and essential for secretion. We show that hrcN encodes the putative TTS ATPase of Pseudomonas syringae pathovar phaseolicola and that HrcN is a peripheral protein that assembles in clusters at the membrane. A decahistidinyl HrcN derivative was overexpressed in Escherichia coli and purified to homogeneity in a folded state. Hydrodynamic analysis, cross-linking, and electron microscopy revealed four distinct HrcN forms: I, 48 kDa (monomer); II, approximately 300 kDa (putative hexamer); III, 575 kDa (dodecamer); and IV, approximately 3.5 MDa. Form III is the predominant form of HrcN at the membrane, and its ATPase activity is dramatically stimulated (>700-fold) over the basal activity of Form I. We propose that TTS ATPases catalyze protein translocation as activated homo-oligomers at the plasma membrane. J Biol Chem

Published
2003

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