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Preliminary coating design and coating developments for ATHENA

Preliminary coating design and coating developments for ATHE...

conference on Optics for EUv, X-Ray, and Gamma-Ray Astronomy v/SPIE Optics + Photonics International Symposium on optical engineering + Applications

作者： Jakobsen, Anders C. Ferreira, Desiree Della Monica Christensen, Finn E. Shortt, Brian Collon, Max Ackermann, Marcelo D. DTU Space Juliane Maries Vej 30 DK-2100 Copenhagen O Denmark European Space Technol Ctr Amsterdam Netherlands Cosine Res BV Leiden Netherlands

ISBN: (纸本)9780819487575

We present initial novel coating design for ATHENA. We make use of both simple bilayer coatings of Ir and B4C and more complex constant period multilayer coatings to enhance the effective area and cover the energy range from 0.1 to 10 kev. We also present the coating technology used for these designs and present test results from coatings.

关键词： Coating Chromium Multilayers Silicon Surface roughness Semiconducting wafers Mirrors Telescopes Data modeling X-rays

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design, elaboration and implementation of 4-20mA current to profibus PA converter

Design, elaboration and implementation of 4-20mA current to ...

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2011 IEEE 9th Latin American Robotics Symposium and IEEE Colombian conference on Automatic Control, LARC 2011

作者： Carolina, M. Cardona B. Adriana, M. Castañeda v. Carlos, E. Cotrino B. Electronics Department Pontificia Universidad Javeriana Bogotá Colombia

ISBN: (纸本)9781457716904

This document presents the standard requirements, developments and evaluation of a converter from 4-20mA to Profibus-PA, standing out the complexity that implies the design of a device that must fulfill the technical requirements as established in an international standard. First, concepts and requirements of the Profibus PA protocol are stated, describing the structure of the messages frames and the way to send them within an industrial telecommunications network. Later on, the internal layout of the designed converter is explained, emphasizing the components used to fulfill the international standard IEC61158. In addition, the use of Bus Check BC-450 softing protocol analyzer is exposed as an analysis and monitoring tool for the configured network © 2011 IEEE.

关键词： Profibus Converters Telecommunication Networks Operation of a device optical coherence tomography angiography device Messages Nylons accuracy class Network analysers

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A HIGHLY EFFICIENT HYBRID CDS-GAAS SOLAR CELL

A HIGHLY EFFICIENT HYBRID CDS-GAAS SOLAR CELL

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IEEE Photovoltaic Specialists conference

作者： H. C. Chen C. C. Lin Y. L. Tsai H. v. Han Peichen Yu H. C. Kuo Department of Photonic & Institute of Electro-Optical Engineering National Chiao Tung University Hsinchu 300 Taiwan Institute of Photonic System National Chiao Tung University Tainan 711 Taiwan

ISBN: (纸本)9781467300643

A novel design of hybrid solar cell combining traditional GaAs-based solar cell with colloidal CdS quantum dots (ODs) is demonstrated. By applying CdS ODs on the surface of GaAs device, we can obtain an effective antireflection coating at long wavelength. Moreover, due to its strong absorption at ultraviolet range and efficient light emission at blue photon, CdS quantum dots can downconvert the high-energy Uv photons into visible ones, which are more easily to be collected in GaAs solar cell. The short circuit current and power conversion efficiency of this new device increases by 21% and 18.9%, respectively, when we compare them to the uncoated GaAs solar cell. An increase of the surface photoconductivity was also detected due to Uv presence, and the fill factor of the CdS ODs solar cell can be improved accordingly.

关键词： short fill uncoated

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Development of a 100-terawatt hybrid femtosecond laser system

Development of a 100-terawatt hybrid femtosecond laser syste...

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conference on ICONO 2010 - International conference on Coherent and Nonlinear Optics

作者： Losev, v. Alekseev, S. Ivanov, N. Kovalchuk, B. Mikheev, L. Mesyats, G. Panchenko, Yu. Puchikin, A. Ratakhin, N. Yastremsky, A. Russian Acad Sci Inst High Current Elect HCEI SB RAS Siberian Branch Ave Akad 2-3 Tomsk 634055 Russia Russian Acad Sci PN Lebedev Phys Inst Moscow 119991 Russia

ISBN: (纸本)9780819485663

Terawatt hybrid (solid state/gas) laser (THL-100) system on the basis of Ti:sapphire starting complex (50 fs, 5 mJ) and photochemical XeF(C-A) amplifier with the aperture of 24 cm is presented. Laser system is built at Institute of High current Electronics SD RAS, Tomsk, Russia. The design and peculiarities of optical pumping of XeF(C-A) amplifier, methods of pump power measuring, gain distribution across the active volume are discussed. The results of numerical modeling of the output parameters simulation are presented and one compared with first experimental results.

关键词： optical amplifiers Laser systems engineering Xenon Femtosecond phenomena Molecules vacuum ultraviolet Diodes Mirrors Pulsed laser operation Photons

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The Potential Role of Bismide Alloys in Future Photonic Devices

The Potential Role of Bismide Alloys in Future Photonic Devi...

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13th International conference on Transparent optical Networks (ICTON)

作者： Sweeney, S. J. Batool, Z. Hild, K. Jin, S. R. Hosea, T. J. C. Univ Surrey Adv Technol Inst Surrey GU2 7XH England Univ Teknol Malaysia Ibnu Sina Inst Fac Sci Dept Phys Skudai 81310 Malaysia

ISBN: (纸本)9781457708800

In a similar manner to the dilute nitrides, the incorporation of Bismuth in semiconductors such as GaAs is predicted to lead to a band-anti-crossing effect (in the valence band) causing a large band gap bowing. In addition, the large size of Bismuth atoms gives rise to a large spin-orbit splitting. This opens-up interesting new possibilities for efficient photonic devices, such as near-and mid-infrared lasers which are more thermally stable and less susceptible to losses compared to conventional InP-based devices. Since Bismuth principally influences the valence band, while nitrogen influences the conduction band, combining Bismuth and Nitrogen in III-v alloys offers huge potential for engineering the conduction and valence band offsets, the band gap and spin-orbit splitting, with wide scope for the design of photonic devices.

关键词： Bismuth semiconductor lasers quantum wells Auger recombination temperature sensitivity threshold current optical communications mid-infrared

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System-software co-engineering: Dependability and safety perspective

System-software co-engineering: Dependability and safety per...

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IEEE International conference on Space Mission Challenges for Information Technology

作者： Yushtein, Y. Bozzano, M. Cimatti, A. Katoen, J.-P. Nguyen, v.Y. Noll, Th. Olive, X. Roveri, M. Systems Software and Technology Department European Space Agency Noordwijk NL Netherlands Embedded Systems Research Unit Fondazione Bruno Kessler Trento Italy Software Modeling and Verification Group RWTH Aachen University Germany Research Department Thales Alenia Space France Cannes la Bocca France

ISBN: (纸本)9780769544465

The need for an integrated system-software co-engineering framework to support the design of modern space systems is pressing. The current tools and formalisms tend to be tailored to specific analysis techniques and are not amenable for the full spectrum of required system aspects such as safety, dependability and performability. Additionally, they cannot handle the intertwining of hardware and software interaction. As such, the current practices lack integration and coherence. We recently developed a coherent and multidisciplinary approach towards developing space systems at architectural design level, linking all of the aforementioned aspects, and assessed it with several industrial evaluations. This paper reports on the approach, the evaluations and our perspective on current and future developments. © 2011 IEEE.

关键词： Fault tree analysis

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current collection from different Si devices based on nanoscale Si-layered systems containing a new metamaterial for photovoltaics

Current collection from different Si devices based on nanosc...

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conference on the Sustainable design, Manufacturing, and engineering Workforce Education for a Green Future

作者： Hosatte, M. Basta, M. Sieradzki, A. Meyrueis, P. Kuznicki, Z. T. ENSPS Pole API Parc Innovat Photon Syst Lab Blvd Sebastien BrantBP 10413 F-67400 Illkirch Graffenstaden France Wroclaw Univ Technol PL-50370 Wroclaw Poland

ISBN: (纸本)9780819486516

Nanoscale Si-layered systems represent an attractive way to enlarge optical and electrical functions in Si optoelectronic, photonic and Pv technology. Physical interactions transform the initial Si material to a new Si-based metamaterial. The device architecture also plays a role in specific nonlinear features. The newly observed behavior requires a better insight into understanding the mechanisms determining the macroscopic performance. We report here some specific electrical properties resulting from the complexity of the electron transport in different test structures designed and manufactured by us. One of the most important parameters concerns state of the device surface. Measurements have been carried out in different conditions of illumination (spectral composition, intensity, with/without optical bias), acquisition mode (duration of acquisition) and device polarization mode (photodiode, photovoltaic). Time-resolved current collection with stabilized voltages, as well as time-resolved voltage variation under stabilized currents, both made under light excitation, allowed observation of extremely long time constants.

关键词： silicon nanostructure metamaterial I-v curves quantum efficiency carrier multiplication

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Integrated spectrometers for spectral-domain optical coherence tomography

Integrated spectrometers for spectral-domain optical coheren...

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European Quantum Electronics conference, EQEC 2011

作者： Akca, B.I. Nguyen, v.D. Kalkman, J. van Leeuwen, T.G. Worhoff, K. De Ridder, R.M. Pollnau, M. Integrated Optical MicroSystems Group Institute for Nanotechnology University of Twente 7500 AE Enschede Netherlands Biomedical Engineering and Physics Academic Medical Center University of Amsterdam Amsterdam 1100 DE Netherlands Biomedical Photonic Imaging MIRA Institute for Biomedical Technology and Technical Medicine University of Twente PO Box 217 7500 AE Enschede Netherlands

ISBN: (纸本)9781457705335

optical coherence tomography (OCT) [1] is a non-invasive optical technique for high-resolution cross-sectional imaging of biological systems. current OCT systems are bulky and costly. A significant decrease in the size of OCT systems is possible through integrated optics. In this work, we present the design and fabrication of arrayed waveguide gratings (AWGs) at 800 and 1300 nm as these wavelengths are commonly applied to retina and skin imaging, respectively. We perform interferometric depth ranging measurements with AWG spectrometers in a spectral-domain OCT (SD-OCT) set-up thus demonstrating the first important step toward miniaturization of an OCT system in silicon-oxynitride (SiON) for the 800-nm and 1300-nm spectral ranges. © 2011 IEEE.

关键词： optical tomography

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FISA-2009 conference on Euratom Research and Training Activities: Nuclear Fission - Past, Present and Future (Generation-II, -III and -Iv plus Partitioning and Transmutation)

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NUCLEAR engineering AND design 2011年第9期241卷 3376-3388页

作者： Bhatnagar, v. Deffrennes, M. Hugon, M. Manolatos, P. Ptackova, K. van Goethem, G. Webster, S. Commiss European Communities Res Directorate Gen B-1049 Brussels Belgium

This paper is an introduction to the research and training activities carried out under the Euratom 7th Framework Programme (FP7, 2007-2011) in the field of nuclear fission science and technology, covering in particular nuclear systems and safety, and including innovative reactor systems and partitioning and transmutation. It is based on the more than 40 invited lectures that were delivered by Euratom project coordinators and keynote speakers at the FISA-2009 conference (FISA, 2009), organised by the European Commission DG Research, 22-24 June 2009, Prague, Czech Republic. The Euratom programme must be considered in the context of current and future nuclear technology and the respective research effort: Generation-II (i.e. yesterday, NPP construction 1970-2000): safety and reliability of nuclear facilities and energy independence in order to ensure security of supply worldwide;Generation-III (i.e. today, construction 2000-2040+): continuous improvement of safety and reliability, and increased industrial competitiveness in a growing energy market;Generation-Iv (i.e. tomorrow, construction from 2040) for increased sustainability though optimal utilisation of natural resources and waste minimisation, and increased proliferation resistance. Consequently, the focus of the lectures devoted to Generation-II and -III is on the major scientific challenges and technological developments needed to guarantee safety and reliability, in particular issues associated with plant lifetime extension and operation. The focus of the lectures devoted to Generation-Iv is on the design objectives and associated research issues that have been agreed upon internationally, in particular the ambitious criteria and technology goals established at the international level by the Generation-Iv International Forum (GIF). In the future, electricity must continue to be produced competitively, and in addition high temperature process heat may also be required, while exploiting a maximum of fissile and

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designing optical path length, photonic, and plasmonic effects into nanostructured solar cells

Designing optical path length, photonic, and plasmonic effec...

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2011 11th IEEE International conference on Nanotechnology, NANO 2011

作者： Nam, Wook Jun Ji, Liming varadan, vasundara v. Fonash, Stephen J. Center for Nanotechnology Education and Utilization Pennsylvania State University University Park PA 16802 United States Solarity LLC 200 Innovation Blvd. State College PA 16803 United States Department of Electrical Engineering University of Arkansas Fayetteville AR 72701 United States

ISBN: (纸本)9781457715143

The numerical modeling presented here shows the carrier collection and light management potential of nano-scale structure designs in solar cells. This design evaluation procedure includes scattering phenomena arising from photonic (periodic structure) and plasmonic effects and also the effective absorber length impact arising from morphology. This design work points to short circuit current densities of over 17mA/cm2 being attainable under AM1.5G from an a-Si:H absorber nominal thickness of 200nm. © 2011 IEEE.

关键词： Solar cells

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