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See detailNeutron scattering study of the magnetic microstructure of nanocrystalline gadolinium
Döbrich, Frank UL; Kohlbrecher, Joachim; Sharp, Melissa et al

in Physical Review. B, Condensed Matter and Materials Physics (2012), 85(094411), 1-17

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See detailNeutron spin-flip scattering of nanocrystalline cobalt
Honecker, Dirk UL; Döbrich, Frank UL; Dewhurst, C. D. et al

in Journal of Physics : Condensed Matter (2011), 23(1), 1-4

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See detailNeutron spin-flip scattering of nanocrystalline cobalt
Honecker, Dirk UL; Döbrich, Frank; Dewhurst, C. D. et al

in Journal of Physics: Condensed Matter (2010), 23(1), 016003

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See detailA neutron-scattering investigation of the magnetic structure and magnetic excitations in nanocrystalline Tb
Vecchini, C.; Moze, O.; Hoser, A. et al

in Journal of Applied Physics (2006), 99(8), 5021-5023

The magnetic structure and magnetic excitations in nanocrystalline Tb have been investigated by neutron diffraction and neutron spectroscopy. This is a report on the long-range magnetic order and the ... [more ▼]

The magnetic structure and magnetic excitations in nanocrystalline Tb have been investigated by neutron diffraction and neutron spectroscopy. This is a report on the long-range magnetic order and the magnetic excitations in a nanocrystalline elemental rare earth. Refinement of the neutron-diffraction data reveals an “average” magnetic structure of each crystallite which contains a significant out-of-plane component to the magnetic moment as well as a suppression of the high-temperature antiferromagnetic phase observed for coarse-grained Tb. The inelastic-neutron-scattering measurements reveal the presence of a magnetic excitation of approximately 10 meV at 2.5 K. The excitation energy decreases with increasing temperature. The origins of this excitation are discussed with particular reference to the magnetic modes at the zone center observed for single-crystal Tb. [less ▲]

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See detailNeutronen sehen Spinorientierung auf Nanoskala
Weissmüller, J.; Michels, Andreas UL

in Physik in unserer Zeit (2004), 35

Die attraktiven magnetischen Eigenschaften nanokristalliner Weichmagnete werden darauf zurückgeführt, dass bei geringer Kristallitgröße die Orientierung der Spins den Sprüngen in den magnetisch leichten ... [more ▼]

Die attraktiven magnetischen Eigenschaften nanokristalliner Weichmagnete werden darauf zurückgeführt, dass bei geringer Kristallitgröße die Orientierung der Spins den Sprüngen in den magnetisch leichten Richtungen von Kristallit zu Kristallit nicht mehr folgen kann. Physiker am Forschungszentrum Karlsruhe konnten jüngst diese Vorhersage mit Neutronenstreuung überprüfen. [less ▲]

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See detailNeutronenstreuuntersuchungen zur magnetischen Mikrostruktur Nd-Fe-B-basierter Nanokomposite
Bick, Jens-Peter UL

Doctoral thesis (2014)

Exchange-coupled magnetic nanocomposites are considered to be promising candidates for future permanent magnet applications. These nanocomposites consist of a hard magnetic phase (based on rare-earth ... [more ▼]

Exchange-coupled magnetic nanocomposites are considered to be promising candidates for future permanent magnet applications. These nanocomposites consist of a hard magnetic phase (based on rare-earth metal alloys), which provides high magnetic anisotropy and which is exchange coupled to a soft magnetic rare earth free phase, which provides a high saturation magnetization and Curie-temperatur. For suitable microstructures one could achieve on the one hand side dramatically increased energy products, in comparison to state-of-the-art Dy-Nd-Fe-B magnets. On the other hand side – due to the reduced amount of rare earth metals – expenses could be saved significantly. The understanding of the coercivity mechanisms in these materials is crucial for the development of nanocomposite permanent magnets. In the present work, the magnetization reversal of a two-phase Nd2Fe14B/Fe3B nanocomposite has been studied by means of magnetic small angle neutron scattering (SANS). This technique exclusively provides access to information of the magnetic microstructure in the bulk of the material and on the relevant length scales of 1 − 100 nm. Direct Fourier-transformation allowed the calculation of the correlation function of the spin misalignment C(r). From this data, the correlation length lc has been obtained. The parameter lc is a measure for the spatial extent of magnetization inhomogeneities. The field dependence of lc indicates a magnetization reversal process, which is widely governed by homogeneous rotation of the magnetization within the hard magnetic Nd2Fe14B particles. In addition, in terms of a micromagnetic approach, the exchange stiffness constant A was determined experimentally. [less ▲]

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See detailA New 1-D Colour Model and its Application to Image Filtering
Garcia Becerro, Frederic UL; Aouada, Djamila UL; Mirbach, Bruno et al

in 2011 7th International Symposium on Image and Signal Processing and Analysis (ISPA) (2011)

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See detailA new access control scheme for Facebook-style social networks
Pang, Jun UL; Zhang, Yang UL

in Computers & Security (2015), 54

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See detailA new access control scheme for Facebook-style social networks
Pang, Jun UL; Zhang, Yang UL

in Proceedings of the 9th Conference on Availability, Reliability and Security (ARES 2014, Best Paper Award) (2014)

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See detailNew Act on the film fund for audiovisual production
Cole, Mark UL; Metzdorf, Jenny

E-print/Working paper (2015)

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See detailNew Algorithms for Secure Outsourcing of Modular Exponentiations
Chen, Xiaofeng; Li, Jin; Ma, Jianfeng et al

in IEEE Trans. Parallel Distrib. Syst. (2014), 25(9), 2386-2396

With the rapid development in availability of cloud services, the techniques for securely outsourcing the prohibitively expensive computations to untrusted servers are getting more and more attentions in ... [more ▼]

With the rapid development in availability of cloud services, the techniques for securely outsourcing the prohibitively expensive computations to untrusted servers are getting more and more attentions in the scientific community. Exponentiations modulo a large prime have been considered the most expensive operation in discrete-logarithm based cryptographic protocols, and the computationally limited devices such as RFID tags or smartcard may be incapable to accomplish these operations. Therefore, it is meaningful to present an efficient method to securely outsource most of this work-load to (untrusted) cloud servers. In this paper, we propose a new secure outsourcing algorithm for (variable-exponent, variable-base) exponentiation modular a prime in the two untrusted program model. Compared with the state-of-the-art algorithm \cite{HL05}, the proposed algorithm is superior in both efficiency and checkability. We then utilize this algorithm as a subroutine to achieve outsource-secure Cramer-Shoup encryptions and Schnorr signatures. Besides, we propose the first outsource-secure and efficient algorithm for simultaneous modular exponentiations. Moreover, we formally prove that both the algorithms can achieve the desired security notions. We also provide the experimental evaluation that demonstrates the efficiency and effectiveness of the proposed outsourcing algorithms and schemes. [less ▲]

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See detailA new ALK isoform transported by extracellular vesicles confers drug resistance to melanoma cells
Cesi, Giulia; Philippidou, Demetra UL; Kozar, Ines UL et al

in Molecular Cancer (2018), (17:145),

Abstract BACKGROUND: Drug resistance remains an unsolved clinical issue in oncology. Despite promising initial responses obtained with BRAF and MEK kinase inhibitors, resistance to treatment develops ... [more ▼]

Abstract BACKGROUND: Drug resistance remains an unsolved clinical issue in oncology. Despite promising initial responses obtained with BRAF and MEK kinase inhibitors, resistance to treatment develops within months in virtually all melanoma patients. METHODS: Microarray analyses were performed in BRAF inhibitor-sensitive and resistant cell lines to identify changes in the transcriptome that might play a role in resistance. siRNA approaches and kinase inhibitors were used to assess the involvement of the identified Anaplastic Lymphoma Kinase (ALK) in drug resistance. The capability of extracellular vesicles (EVs) to transfer drug resistant properties was investigated in co-culture assays. RESULTS: Here, we report a new mechanism of acquired drug resistance involving the activation of a novel truncated form of ALK. Knock down or inhibition of ALK re-sensitised resistant cells to BRAF inhibition and induced apoptosis. Interestingly, truncated ALK was also secreted into EVs and we show that EVs were the vehicle for transferring drug resistance. CONCLUSIONS: To our knowledge, this is the first report demonstrating the functional involvement of EVs in melanoma drug resistance by transporting a truncated but functional form of ALK, able to activate the MAPK signalling pathway in target cells. Combined inhibition of ALK and BRAF dramatically reduced tumour growth in vivo. These findings make ALK a promising clinical target in melanoma patients. [less ▲]

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See detailNew and improved educationalising: Faster, more powerful, and longer lasting
Fendler, Lynn UL

in Ethics & Education (2008), 3(1), 15-26

This paper is a historical and critical analysis of changes in features of educationalisation focusing on how educationalisation has been characterised over time by a peculiar interweaving of knowledge ... [more ▼]

This paper is a historical and critical analysis of changes in features of educationalisation focusing on how educationalisation has been characterised over time by a peculiar interweaving of knowledge and social reform. The history of the American Social Science Association provides a backdrop; drawing on the theories of Deleuze, this paper highlights historical differences between previous and current educationalisation features in research and schooling. Building on the Deleuzian analysis, the paper then examines characteristics of Problem-based Learning, as an example of educationalisation, in so far as it casts education as an engineering task. The paper concludes with a critical analysis of norm-referenced standards in educational research and schooling, questioning the relationship between education and empowerment. [less ▲]

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See detailA new and self-contained proof of Borwein's norm duality theorem
Aragón Artacho, Francisco Javier UL

in Set-Valued Analysis (2007), 15(3), 307-315

Borwein’s norm duality theorem establishes the equality between the outer (inner) norm of a sublinear mapping and the inner (outer) norm of its adjoint mappings. In this note we provide an extended ... [more ▼]

Borwein’s norm duality theorem establishes the equality between the outer (inner) norm of a sublinear mapping and the inner (outer) norm of its adjoint mappings. In this note we provide an extended version of this theorem with a new and self-contained proof relying only on the Hahn-Banach theorem. We also give examples showing that the assumptions of the theorem cannot be relaxed. [less ▲]

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See detailA new approach for optimal control using market-based algorithms
Voos, Holger UL; Litz, Lothar

in European Control Conference, Karlsruhe, Germany, 1999 (1999)

A new method for distributed resource allocation is called market{based control. Market{based control systems im- itate the behavior of an economic system; some applica- tions of this method exist in the ... [more ▼]

A new method for distributed resource allocation is called market{based control. Market{based control systems im- itate the behavior of an economic system; some applica- tions of this method exist in the eld of distributed com- puter and telecommunications systems. A new eld of application is the control of dynamic systems. In this work, the market{based approach is used for optimal con- trol which is still one of the important methods of control theory. Unfortunately, even though most researchers in this area deal with complex systems, they omit the math- ematical background. For this reason, our work focuses on a mathematical description of a market{based control algorithm especially for linear dynamic systems in order to explain the relationship between economic and control systems. It is shown that the optimal control problem can be considered as a special kind of a resource distribution problem. Therefore, the fact that in economic systems re- sources are optimally distributed in a decentralized man- ner even in large and complex systems is very interesting. The obtained algorithm in the case of a linear system is characterized by a very e ective computation and easy understanding. [less ▲]

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See detailNew Approach meets new economy: Enforcing EU product safety in e-commerce
Ullrich, Carsten UL

in Maastricht Journal of European and Comparative Law (2019)

This article reviews recent regulatory initiatives in the area of EU product safety legislation and market surveillance from the angle of e-commerce through online marketplaces. With the arrival of the ... [more ▼]

This article reviews recent regulatory initiatives in the area of EU product safety legislation and market surveillance from the angle of e-commerce through online marketplaces. With the arrival of the internet, the sale of non-compliant and illegal consumer products has proliferated. E-commerce and globalized supply chains are challenging a regulatory system that is fragmented, highly technical and slow to respond to the dynamic changes introduced to the marketplace. The EU Commission’s 2017 notice on the surveillance of products sold online and its latest proposal for a new regulation on enforcing product compliance rules testify to the unsatisfactory state of progress in this area. A reason for this may be seen in the history and nature of New Approach style product law, which outsources technical product regulation to the industry and entrusts enforcement tightly in the hands of specialized national regulators. New actors in the supply chain, such as fulfilment service providers or e-commerce platforms, have fallen between the cracks. This article argues that extending the principles of the New Approach to e-commerce marketplaces, by seeing their activities as affecting essential requirements, could be of interest to both the problems at hand and the wider debate on online platforms regulation. [less ▲]

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See detailA New Approach to EU Data Protection
Giurgiu, Andra UL; Lommel, Gérard

in Kritische Vierteljahresschrift für Gesetzgebung und Rechtswissenschaft = Critical Quarterly for Legislation and Law = Revue Critique Trimestrielle de Jurisprudence et de Législation (2014), 97(1), 10-27

Die Entwicklung neuer Technologien und die bedeutende Rolle des Internets im heutigen Alltag haben den Datenschutz vor neue Herausforderungen gestellt. Darüber hinaus wirkt sich die uneinheitliche ... [more ▼]

Die Entwicklung neuer Technologien und die bedeutende Rolle des Internets im heutigen Alltag haben den Datenschutz vor neue Herausforderungen gestellt. Darüber hinaus wirkt sich die uneinheitliche Umsetzung der Richtlinie 94/46/EG, die den rechtlichen Rahmen für den Datenschutz in Europa bildet, negativ auf den europäischen Binnenmarkt aus. Vor diesem Hintergrund ist es Ziel des Vorschlags der Europäischen Kommission für eine neue Datenschutz- Grundverordnung, den Rechtsrahmen zu harmonisieren und ein erhöhtes Datenschutzniveau der Bürger zu schaffen. Obwohl sich die Europäische Kommission, das Parlament und der Rat in vielen Punkten noch nicht einig sind, ist eine klare Änderung der Perspektive zu erkennen. Unternehmen sollen selbst tätig werden und eine verantwortliche Haltung zum Datenschutz übernehmen. Die Rechenschaftspflicht der für die Verarbeitung Verantwortlichen wird hiermit in den Vordergrund gestellt. Es gilt nun proaktiv zu handeln, und nicht nur reaktiv. Prinzipien wie Datenschutz durch Technik und datenschutzfreundliche Voreinstellungen spiegeln diesen Ansatz wider. Bürger werden ihrerseits mit am Internetzeitalter angepassten Rechten - wie dem Recht auf Datenübertragbarkeit – ausgestattet, um die Kontrolle über ihre Daten in die eigene Hand nehmen zu können. Die Bedingungen einer gültigen Einwilligung in der Online-Welt werden deutlicher gestaltet und Nutzer und Verbraucher mit erweiterten Rechtsschutzinstrumenten ausgestattet, die die Durchsetzbarkeit des Datenschutzes stärken. Auch wenn vor 2015 kaum mit einer Verabschiedung der Reform zu rechnen ist, verspricht diese neue Herangehensweise, die Chance auf einen effizienteren Datenschutz. [less ▲]

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See detailA New Approach to Quantum Logic
Engesser, Kurt; Gabbay, Dov M. UL; Lehmann, Daniel

Book published by College publications (2007)

Detailed reference viewed: 40 (0 UL)
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See detailNew approaches for growth control of GaN-based HEMT structure
Hardtdegen, H.; Steins, R.; Kaluza, N. et al

in Applied Physics A : Materials Science & Processing (2007), 87(3), 491-498

This paper reports on new approaches for growth control of GaN-based heterostructures for high frequency and high power application. First in situ methods are presented and their further development ... [more ▼]

This paper reports on new approaches for growth control of GaN-based heterostructures for high frequency and high power application. First in situ methods are presented and their further development discussed [1]. The development leads to a greatly improved observation of growth parameter influences in the MOVPE of GaN. A new growth process is introduced which enhances growth reproducibility [2]. This new growth process is then optimized with respect to the envisaged application. To this end process modeling will be employed. The application envisaged is the AlxGa1−xN/GaNhigh electron mobility transistor (HEMT). At last device results will be presented. All in all it will be shown how fundamental research can drive technology and how basic knowledge can be employed forprocess development with respect to device applications. [less ▲]

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