| 1. |
- Bennaceur, A., et al.
(författare)
-
Mechanisms for leveraging models at runtime in self-adaptive software
- 2014
-
Ingår i: Lecture Notes in Computer Science: Dagstuhl Seminar 11481 on Models@run.time; ; 27 November 2011 through 2 December 2011. - Cham : Springer. - 9783319089140
-
Konferensbidrag (refereegranskat)abstract
- Modern software systems are often required to adapt their behavior at runtime in order to maintain or enhance their utility in dynamic environments. Models at runtime research aims to provide suitable abstractions, techniques, and tools to manage the complexity of adapting software systems at runtime. In this chapter, we discuss challenges associated with developing mechanisms that leverage models at runtime to support runtime software adaptation. Specifically, we discuss challenges associated with developing effective mechanisms for supervising running systems, reasoning about and planning adaptations, maintaining consistency among multiple runtime models, and maintaining fidelity of runtime models with respect to the running system and its environment. We discuss related problems and state-of-the-art mechanisms, and identify open research challenges.
|
|
| 2. |
- Luterbacher, Jeremy S., et al.
(författare)
-
High yield methane generation from wet biomass and waste
- 2007
-
Ingår i: Pathways to our common future - Proceedings of The Alliance for Global Sustainability Annual Meeting 2007, 18-21 March, Barcelona, Spain.
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)
|
|
| 3. |
- Luterbacher, Jeremy S., et al.
(författare)
-
Hydrothermal Gasification of Waste Biomass: Process Design and Life Cycle Asessment
- 2009
-
Ingår i: Environmental Science & Technology. - : American Chemical Society (ACS). - 0013-936X .- 1520-5851. ; 43:5, s. 1578-1583
-
Tidskriftsartikel (refereegranskat)abstract
- A process evaluation methodology is presented that incorporates flowsheet mass and energy balance modeling, heat and power integration, and life cycle assessment. Environmental impacts are determined by characterizing and weighting (using CO2 equivalents, Eco-indicator 99, and Eco-scarcity) the flowsheet and inventory modeling results. The methodology is applied to a waste biomass to synthetic natural gas (SNG) conversion process involvingacatalytic hydrothermal gasification step. Several scenarios are constructed for different Swiss biomass feedstocks and different scales depending on logistical choices: large-scale (155 MWSNG) and small-scale (5.2 MWSNG) scenarios for a manure feedstock and one scenario (35.6MWSNG) for awoodfeedstock. Process modeling shows that 62% of the manure’s lower heating value (LHV) is converted to SNG and 71% of wood’s LHV is converted to SNG. Life cycle modeling shows that, for all processes, about 10% of fossil energy use is imbedded in the produced renewable SNG. Converting manure and replacing it, as a fertilizer, with the process mineral byproduct leads to reduced N2O emissions and an improved environmental performance such as global warming potential: -0.6 kgCO2eq./MJSNG vs -0.02 kgCO2eq./MJSNG for wood scenarios.
|
|
| 4. |
- Peterson, Andrew A., et al.
(författare)
-
Thermochemical biofuel production in hydrothermal media: A review of sub- and supercritical water technologies
- 2008
-
Ingår i: Energy and Environmental Sciences. - : Royal Society of Chemistry (RSC). - 1754-5692 .- 1754-5706. ; 1:1, s. 32-65
-
Tidskriftsartikel (refereegranskat)abstract
- Hydrothermal technologies are broadly defined as chemical and physical transformations in high-temperature (200–600° C), high-pressure (5–40 MPa) liquid or supercritical water. This thermochemical means of reforming biomass may have energetic advantages, since, when water is heated at high pressures a phase change to steam is avoided which avoids large enthalpic energy penalties. Biological chemicals undergo a range of reactions, including dehydration and decarboxylation reactions, which are influenced by the emperature, pressure, concentration, and presence of homogeneous or heterogeneous catalysts. Several biomass hydrothermal conversion processes are in development or demonstration. Liquefaction processes are generally lower temperature (200–400° C) reactions which produce liquid products, often called ‘‘bio-oil’’ or ‘‘bio-crude’’.Gasification processes generally take place at higher temperatures (400–700° C) and can produce methane or hydrogen gases in high yields.
|
|
| 5. |
- Vogel-Heuser, B., et al.
(författare)
-
Selected challenges of software evolution for automated production systems
- 2015
-
Ingår i: 13th International Conference on Industrial Informatics, INDIN 2015, Robinson College, Cambridge, United Kingdom, 22 - 24 July 2015. - : IEEE. - 9781479966493
-
Konferensbidrag (refereegranskat)abstract
- Automated machines and plants are operated for some decades and undergo an everlasting evolution during this time. In this paper, we present three related open evolution challenges focusing on software evolution in the domain of automated production systems, i.e. evolution and co-evolution of (interdisciplinary) engineering models and code, quality assurance as well as variant and version management during evolution.
|
|
