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The Astrophysical journal, ISSN 1538-4357, 2011, Volume 739, Issue 1, p. 24
.... We then study the evolution of the number density and mass density of quiescent and star-forming galaxies, extending the results of the COMBO-17, DEEP2, and other surveys to z = 2.2... 
galaxies: formation | galaxies: evolution | galaxies: high-redshift | PHOTOMETRIC REDSHIFTS | MEDIUM-BAND SURVEY | COLOR-MAGNITUDE DISTRIBUTION | K-SELECTED GALAXIES | LUMINOSITY FUNCTION | MULTIWAVELENGTH SURVEY | RED-SEQUENCE | ASTRONOMY & ASTROPHYSICS | SPECTRAL ENERGY-DISTRIBUTION | DEEP-FIELD-SOUTH | STELLAR POPULATION SYNTHESIS | Physics - Cosmology and Nongalactic Astrophysics
Journal Article
1994, ISBN 0201626543, Volume 89., xxi, 259
Book
High energy density physics, ISSN 1574-1818, 2005
Journal
2015, ISBN 9780262029148, ix, 306
In this book, Vaclav Smil argues that power density is a key determinant of the nature and dynamics of energy systems... 
Renewable energy sources | Energy level densities | Energy auditing | Power resources | Components, Circuits, Devices and Systems | Geoscience | Power, Energy and Industry Applications
Book
2010, ISBN 9781844074600, xlii, 342
Compact living is sustainable living. High-density cities can support closer amenities, encourage reduced trip lengths and the use of public transport and therefore reduce transport energy costs and carbon emissions... 
Built Environment | City and Urban Planning | Architecture | Energy | Cities & Infrastructure (Urban Studies) | Urban ecology (Sociology) | Environmental aspects | Sustainable urban development | City planning | Urban density | Sustainable architecture
Book
SAE technical paper series, Volume 962088.
A technique to determine flame surface density in a spark-ignition engine from planar laser-induced fluorescence (PLIF... 
Fuels and Energy Sources | Tests and Testing | Spark ignition engines
eJournal
SAE technical paper series, Volume 1999-01-2600
.... Compared to battery-based energy storage systems, RFCS has received relatively little attention or resources for development because the energy density and electrical efficiency were not sufficiently... 
Auxiliary power units | Fuel cells | Electromagnetic compatibility | On-board energy sources | Energy storage systems | Simulation and modeling | Alternative fuels | Refueling
eJournal
Physical chemistry chemical physics : PCCP, ISSN 1463-9084, 2017, Volume 19, Issue 27, pp. 17928 - 17936
A new model for reference electron densities, really getting rid of interactions... 
HYDROGEN | ENERGY | NONCOVALENT INTERACTION REGIONS | BONDS | PHYSICS, ATOMIC, MOLECULAR & CHEMICAL | CHEMISTRY, PHYSICAL | BINDING | or physical chemistry | Chemical Sciences | Theoretical and
Journal Article
The Journal of chemical physics, ISSN 1089-7690, 2012, Volume 136, Issue 15, pp. 150901 - 150901-9
Journal Article
SAE technical paper series, Volume 961975.
The influence of fuel density on exhaust emissions from diesel engines has been investigated in a number of studies and these have generally concluded that particulate emissions rise with increasing... 
Electronic control systems | Exhaust emissions | On-board energy sources | Diesel fuels | Engines | Emissions
eJournal
SAE technical paper series, Volume 1999-01-2515
We have developed long-life of Ni/MH and of Li-ion batteries for use as a backup power supply for telecommunications. The improved Ni/MH batteries have an... 
Auxiliary power units | Electromagnetic compatibility | Lithium | Nickel | Telecommunications | Energy storage systems | Simulation and modeling | Alternative fuels | Refueling
eJournal