http://www.rssboard.org/rss-specification 720 https://escholarship.org/uc/cpl_rw/rss Recent eScholarship items from Other Recent Work Fri, 4 Sep 2026 16:17:03 +0000 https://escholarship.org/uc/item/5p11f68b <p>Biodiesel is a notable alternative to petroleum derived diesel fuel because it comes from natural domestic sources and thus reduces dependence on diminishing petroleum fuel from foreign sources, it likely lowers lifecycle greenhouse gas emissions, and it lowers an engine’s emission of most pollutants as compared to petroleum derived diesel. However, the use of biodiesel often slightly increases a diesel engine’s emission of smog forming nitrogen oxides (NOx) relative to petroleum diesel. In this paper, previously proposed theories for this slight NOx increase are reviewed, including theories based on biodiesel’s cetane number, which leads to differing amounts of charge preheating, and theories based on the fuel’s bulk modulus, which affects injection timing. This paper proposes an additional theory for the slight NOx increase of biodiesel. Biodiesel typically contains more double bonded molecules than petroleum derived diesel. These double bonded molecules have a slightly higher... https://escholarship.org/uc/item/5p11f68b Wed, 25 Jul 2007 00:00:00 +0000 Ban-Weiss, George A. Chen, J.Y. Buchholz, Bruce A. Dibble, Robert W.