| 1. |
- Armstrong, David A., et al.
(författare)
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Standard electrode potentials involving radicals in aqueous solution : inorganic radicals (IUPAC Technical Report)
- 2015
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Ingår i: Pure and Applied Chemistry. - : Walter de Gruyter. - 0033-4545 .- 1365-3075. ; 87:11-12, s. 1139-1150
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Tidskriftsartikel (refereegranskat)abstract
- Recommendations are made for standard potentials involving select inorganic radicals in aqueous solution at 25 degrees C. These recommendations are based on a critical and thorough literature review and also by performing derivations from various literature reports. The recommended data are summarized in tables of standard potentials, Gibbs energies of formation, radical pK(a)'s, and hemicolligation equilibrium constants. In all cases, current best estimates of the uncertainties are provided. An extensive set of Data Sheets is appended that provide original literature references, summarize the experimental results, and describe the decisions and procedures leading to each of the recommendations.
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| 2. |
- Dherbecourt, J. B., et al.
(författare)
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Design and pre-development of an airborne multi-species differential absorption Lidar system for water vapor and HDO isotope, carbon dioxide, and methane observation
- 2021
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Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - : SPIE-Intl Soc Optical Eng.
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Konferensbidrag (refereegranskat)abstract
- We report on the current design and preliminary developments of the airborne Lidar Emitter and Multi-species greenhouse gases Observation iNstrument (LEMON), which is aiming at probing H2O and its isotope HDO at 1982 nm, CO2 at 2051 nm, and potentially CH4 at 2290 nm, with the Differential Absorption Lidar method (DIAL). The infrared emitter is based on the combination of two Nested Cavity OPOs (NesCOPOs) with a single optical parametric amplifier (OPA) line for high-energy pulse generation. This configuration is enabled by the use of high-aperture periodically poled KTP crystals (PPKTP), which provide efficient amplification in the spectral range of interest around 2 μm with slight temperature adjustments. The parametric stages are pumped with a Nd:YAG laser providing 200 mJ nanosecond double pulses at 75 Hz. According to parametric conversion simulations supported by current laboratory experiments, output energies in the 40 - 50 mJ range are expected in the extracted signal beam whilst maintaining a good beam quality (M2 < 2). The ruler for all the optical frequencies involved in the system is planned to be provided by a GPS referenced frequency comb with large mode spacing (1 GHz) against which the emitter output pulses can be heterodyned. The frequency precision measurement is expected to be better than 200 kHz for the optical frequencies of interest. The presentation will give an overview of the key elements of design and of preliminary experimental characterizations of sub-systems building blocks.
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| 3. |
- Dherbecourt, J. B., et al.
(författare)
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Lidar Emitter and Multi-species greenhouse gases Observation iNstrument (LEMON) : advances on a multi-species differential absorption Lidar system
- 2022
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Ingår i: 73rd International Astronautical Congress, IAC 2022. - : International Astronautical Federation, IAF.
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Konferensbidrag (refereegranskat)abstract
- In the frame of LEMON project (Lidar Emitter and Multi-species greenhouse gases Observation iNstrument - European Union's Horizon 2020 research and innovation program, GA n°821868), we are developing a multi-species differential absorption Lidar (DIAL). The goal is to benefit from innovative technological developments in terms of optical emitter, spectral reference, to be able to address H2O and its isotope HDO at 1982 nm, CO2 at 2051 nm, and potentially CH4 at 2290 nm, for future ground-based range-resolved DIAL sensing, and with the prospect of future airborne integrated-path DIAL (IPDA). The infrared emitter is based on the combination of two specific, patented, no-seeder Nested Cavity OPOs (NesCOPOs) coupled to a single optical parametric amplifier (OPA) line for high energy pulses generation. Specific developments are also pursued on the frequency reference for the emitter, which is planned to be provided by a GPS referenced frequency comb against which the emitter output pulses can be heterodyned. Besides the instrument design, specific tests experiments have been carried out, covering a wide panel of activities: radiation testing of some critical components to assess the potential of some key components for future space applications, emitter and frequency reference testing, preliminary DIAL tests with laboratory test-beds and comparison with specific in-situ calibration instruments as well as additional innovative techniques evaluation for the emitter. The final instrument design was carried out and the sub-units are now being built.
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| 4. |
- Setty, V., et al.
(författare)
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Maximizing the number of satisfied subscribers in pub/sub systems under capacity constraints
- 2014
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Ingår i: Proceedings - IEEE INFOCOM. - 9781479933600 ; , s. 2580-2588
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Konferensbidrag (refereegranskat)abstract
- Publish/subscribe (pub/sub) is a popular communication paradigm in the design of large-scale distributed systems. A provider of a pub/sub service (whether centralized, peer-assisted, or based on a federated organization of cooperatively managed servers) commonly faces a fundamental challenge: given limited resources, how to maximize the satisfaction of subscribers? We provide, to the best of our knowledge, the first formal treatment of this problem by introducing two metrics that capture subscriber satisfaction in the presence of limited resources. This allows us to formulate matters as two new flavors of maximum coverage optimization problems. Unfortunately, both variants of the problem prove to be NP-hard. By subsequently providing formal approximation bounds and heuristics, we show, however, that efficient approximations can be attained. We validate our approach using real-world traces from Spotify and show that our solutions can be executed periodically in real-time in order to adapt to workload variations.
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| 5. |
- Setty, V., et al.
(författare)
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The hidden pub/sub of spotify (Industry Article)
- 2013
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Ingår i: DEBS 2013 - Proceedings of the 7th ACM International Conference on Distributed Event-Based Systems. - New York, NY, USA : ACM. - 9781450317580 ; , s. 231-240
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Konferensbidrag (refereegranskat)abstract
- Spotify is a peer-assisted music streaming service that has gained worldwide popularity. Apart from providing instant access to over 20 million music tracks, Spotify also enhances its users' music experience by providing various features for social interaction. These are realized by a system using the widely-adopted pub/sub paradigm. In this paper we provide an interesting case study of a hybrid pub/sub system designed for real-time as well as offline notifications for Spo-tify users. We firstly describe a multitude of use cases where pub/sub is applied. Secondly, we study the design of its pub/sub system used for matching, disseminating and persisting billions of publications every day. Finally, we study pub/sub traffic collected from the production system, derive characterizations of the pub/sub workload, and show some interesting findings and trends.
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