9 results
Search Results
2. Unregulated Emissions from Compressed Natural Gas (CNG) Transit Buses Configured with and without Oxidation Catalyst.
- Author
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Okamoto, Robert A., Kado, Norman Y., Kuzmicky, Paul A., Ayala, Alberto, and Kobayashi, Reiko
- Subjects
- *
COMPRESSED natural gas , *EMISSIONS (Air pollution) , *AIR pollution , *OXIDATION , *CATALYSTS , *ORIGINAL equipment manufacturers , *COMPUTER industry , *ENVIRONMENTAL protection - Abstract
The unregulated emissions from two in-use heavy-duty transit buses fueled by compressed natural gas (CNG) and equipped with oxidation catalyst (OxiCat) control were evaluated. We tested emissions from a transit bus powered by a 2001 Cummins Westport C Gas Plus 8.3-L engine (CWest), which meets the California Air Resources Board's (CARB) 2002 optional NOx standard (2.0 g/bhp-hr). In California, this engine is certified only with an OxiCat, so our study did not include emissions testing without it. We also tested a 2000 New Flyer 40-passenger low-floor bus powered by a Detroit Diesel series 506 engine (DDCs50G) that is currently certified in California without an OxiCat. The original equipment manufacturer (OEM) offers a "low-emission" package for this bus that includes an OxiCat for transit bus applications, thus, this configuration was also tested in this study. Previously, we reported that formaldehyde and other volatile organic emissions detected in the exhaust of the DDCs50G bus equipped with an OxiCat were significantly reduced relative to the same DDCs50G bus without OxiCat. In this paper, we examine other toxic unregulated emissions of significance. The specific mutagenic activity of emission sample extracts was examined using the microsuspension assay. The total mutagenic activity of emissions (activity per mile) from the OxiCat-equipped DDC bus was generally lower than that from the DDC bus without the OxiCat. The CWest bus emission samples had mutagenic activity that was comparable to that of the OxiCat-equipped DDC bus. In general, polycyclic aromatic hydrocarbon (PAH) emissions were lower for the OxiCat-equipped buses, with greater reductions observed for the volatile and semivolatile PAH emissions. Elemental carbon (EC) was detected in the exhaust from the all three bus configurations, and we found that the total carbon (TC) composition of particulate matter (PM) emissions was primarily organic carbon (OC). The amount of carbon emissions far exceeded the PM-associated inorganic element emissions, which were detected in all exhaust samples, at comparatively small emission rates. In summary, based on these results and those referenced from our group, the use of OxiCat for the new CWest engine and as a retrofit option for the DDCs50G engine generally results in the reduction of tailpipe toxic emissions. However, the conclusions of this study do not take into account OxiCat durability, deterioration, lubricant consumption, or vehicle maintenance, and these parameters merit further study. [ABSTRACT FROM AUTHOR]
- Published
- 2006
- Full Text
- View/download PDF
3. professional activities.
- Subjects
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CONFERENCES & conventions , *COMPUTER industry , *COMPUTER science conferences , *INFORMATION resources management , *INFORMATION science , *SOCIETIES - Abstract
The article announces several events related to the computing industry. The biennial conference of the British Computer Society will be held at the Cunard International Hotel in London, England from October 4 to 6, 1977. The second conference of the European Cooperation in Informatics, which will be held in Venice, Italy from October 10 to 12, 1978, has the theme Information System Methodology. Papers and demonstrations are being solicited for the 1978 National Computer Conference on June 5 to 8, 1978 in California.
- Published
- 1977
4. Intel, NEC show diverging CPU paths.
- Author
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Merritt, Rick
- Subjects
- *
CONFERENCES & conventions , *COMPUTER industry , *ELECTRONICS - Abstract
The article discusses the papers presented at the International Solid-State Circuits Conference (ISSCC) held in February 2009 at the San Francisco Marriott hotel in California. One of the papers considers the introduction of Intel Corp.'s Nehalem-EX server CPU, a 2.3 billion-transistor member of its 45-nm Nehalem family. Meanwhile, another paper shows the technique described by Hideaki Saito, a principal researcher at NEC Corp., for stacking a memory chip using direct aluminum-to-copper links.
- Published
- 2009
5. California: Census Computer Found Lacking Under Pressure.
- Subjects
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DEMOGRAPHIC surveys , *ELECTRONIC systems , *COMPUTER industry - Abstract
The Government Accountability Office says a computer system needed to finish the 2010 census may not be up to the job. Robert Goldenkoff, the office's strategic issues director, said Friday before a Congressional hearing in Los Angeles that the Paper Based Operations Control System had not demonstrated the ability to meet peak requirements as it sought to count residents who did not return census forms by mail. Robert Groves, the census director, said the problems stemmed from a late change from a handheld device system to the paper-based system. [ABSTRACT FROM PUBLISHER]
- Published
- 2010
6. SIGGRAPH 2004.
- Author
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Em, David and Pournelle, Alex
- Subjects
- *
CONFERENCES & conventions , *COMPUTER industry , *COMPUTER systems , *CONFERENCE proceedings (Publications) - Abstract
The article highlights the 31st annual conference of the Special Interest Group on Graphics (SIGGRAPH) of the Association for Computing Machinery held at the Los Angeles Convention Center in Los Angeles, California from August 8 to 12, 2004. A couple of decades ago, conference attendees could count on seeing a couple things at SIGGRAPH that had literally never been seen before in human history, such as textured 3D objects or hierarchical human animation. SIGGRAPH 2004's total exhibition area was smaller than the hallowed days of yore, composed mostly of software companies, some boutique specialty hardware outfits, schools, and graphics board manufacturers. Walking the show's exhibit floor provides ample evidence that the industry's major players have changed in recent years. One reason the show floor's smaller is that there's been considerable consolidation in both the hardware and software graphics industries over the last few years. There were several indications this trend is still in full swing. One class of hardware that wasn't in evidence at the show was tablet computers. There's exactly one attendee using a tablet, compared to hundreds of laptops of every size and description. If the SIGGRAPH community's resisted adopting tablets as mobile work devices, one wonders if there's any hope for them in the wider community, at least until they become as thin and light as paper.
- Published
- 2004
7. SIGGRAPH 2004.
- Author
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Em, David and Pournelle, Alex
- Subjects
- *
CONFERENCES & conventions , *EXHIBITIONS , *ASSOCIATIONS, institutions, etc. , *COMPUTER industry - Abstract
The article focuses on the first annual conference and exhibition held by the Association for Computing Machinery's Special Interest Group on Graphics (SIGGRAPH) at the Los Angeles Convention Center, California from August 8 to 12, 2004. The show drew 27,825 attendees, down from its high of nearly 50,000 seven years ago, but up from 17,000 two years ago. SIGGRAPH remains the Mother of All Imaging Conferences, featuring a unique mix of science, art, commerce and education. With a wide selection of panels, papers, films, and innovative exhibits, SIGGRAPH rarely disappoints. SIGGRAPH 2004's total exhibition area was smaller than the hallowed days of yore, composed mostly of software companies, some boutique specialty hardware outfits, schools and graphics board manufacturers. Walking the show's exhibit floor provides ample evidence that the industry's major players have changed in recent years. One reason the show floor's smaller is that there has been considerable consolidation in both the hardware and software graphics industries over the last few years. There were several indications this trend is still in full swing. Alias Systems Inc., makers of Maya 6 third-dimensional visualization and animation software, announced the acquisition of Kaydara Inc., makers of character animation and motion editing tools. Nvidia Corp. also announced that Gelato, its graphics-card-accelerated renderer, is now available as a native renderer within Maya, which we hope to evaluate soon.
- Published
- 2004
8. SIGGRAPH 2004.
- Author
-
Em, David and Pournelle, Alex
- Subjects
- *
CONFERENCES & conventions , *EXHIBITIONS , *ASSOCIATIONS, institutions, etc. , *COMPUTER industry - Abstract
The article focuses on the first annual conference and exhibition held by the Association for Computing Machinery's Special Interest Group on Graphics (SIGGRAPH) at the Los Angeles Convention Center, California from August 8 to 12, 2004. The show drew 27,825 attendees, down from its high of nearly 50,000 seven years ago, but up from 17,000 two years ago. SIGGRAPH remains the Mother of All Imaging Conferences, featuring a unique mix of science, art, commerce, and education. With a wide selection of panels, papers, films, and innovative exhibits, SIGGRAPH rarely disappoints. SIGGRAPH 2004's total exhibition area was smaller than the hallowed days of yore, composed mostly of software companies, some boutique specialty hardware outfits, schools, and graphics board manufacturers. Walking the show's exhibit floor provides ample evidence that the industry's major players have changed in recent years. One reason the show floor's smaller is that there's been considerable consolidation in both the hardware and software graphics industries over the last few years. There were several indications this trend is still in full swing. Alias Systems Inc., makers of Maya 6 third-dimensional visualization and animation software, announced the acquisition of Kaydara Inc., makers of character animation and motion editing tools. Nvidia Corp. also announced that Gelato, its graphics-card-accelerated renderer, is now available as a native renderer within Maya, which we hope to evaluate soon.
- Published
- 2004
9. Future PC designs demand high-speed I/Os, fast graphics, and lower power.
- Author
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Bursky, Dave
- Subjects
- *
COMPUTER industry , *PERSONAL computer design & construction - Abstract
Reports on the Silicon Valley Personal Computer Design Conference and Exposition scheduled for July 27-29, 1994 at the Hyatt Hotel in San Jose, California. Focus on technical challenges faced by personal computer designers when planning next-generation systems; Presentation of papers that explore multimedia and high-performance graphic displays; Other design issues to be discussed during the conference.
- Published
- 1994
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