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Title: Web Proxy / Filter Appliance.


Abstract not provided.

Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Proposed for presentation at the Presentation to visitors held May 17, 2007 in Albuquerque, NM.
Country of Publication:
United States

Citation Formats

Long, John P. Web Proxy / Filter Appliance.. United States: N. p., 2007. Web.
Long, John P. Web Proxy / Filter Appliance.. United States.
Long, John P. Tue . "Web Proxy / Filter Appliance.". United States. doi:.
title = {Web Proxy / Filter Appliance.},
author = {Long, John P.},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 00:00:00 EDT 2007}

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  • All four of the LHC experiments depend on web proxies (that is, squids) at each grid site to support software distribution by the CernVM FileSystem (CVMFS). CMS and ATLAS also use web proxies for conditions data distributed through the Frontier Distributed Database caching system. ATLAS & CMS each have their own methods for their grid jobs to find out which web proxies to use for Frontier at each site, and CVMFS has a third method. Those diverse methods limit usability and flexibility, particularly for opportunistic use cases, where an experiment’s jobs are run at sites that do not primarily supportmore » that experiment. This paper describes a new Worldwide LHC Computing Grid (WLCG) system for discovering the addresses of web proxies. The system is based on an internet standard called Web Proxy Auto Discovery (WPAD). WPAD is in turn based on another standard called Proxy Auto Configuration (PAC). Both the Frontier and CVMFS clients support this standard. The input into the WLCG system comes from squids registered in the ATLAS Grid Information System (AGIS) and CMS SITECONF files, cross-checked with squids registered by sites in the Grid Configuration Database (GOCDB) and the OSG Information Management (OIM) system, and combined with some exceptions manually configured by people from ATLAS and CMS who operate WLCG Squid monitoring. WPAD servers at CERN respond to http requests from grid nodes all over the world with a PAC file that lists available web proxies, based on IP addresses matched from a database that contains the IP address ranges registered to organizations. Large grid sites are encouraged to supply their own WPAD web servers for more flexibility, to avoid being affected by short term long distance network outages, and to offload the WLCG WPAD servers at CERN. The CERN WPAD servers additionally support requests from jobs running at non-grid sites (particularly for LHC@Home) which it directs to the nearest publicly accessible web proxy servers. Furthermore, the responses to those requests are geographically ordered based on a separate database that maps IP addresses to longitude and latitude.« less
  • Cooking of food and use of natural gas cooking burners generate pollutants that can have substantial impacts on residential indoor air quality. The extent of these impacts depends on cooking frequency, duration and specific food preparation activities in addition to the extent to which exhaust fans or other ventilation measures (e.g. windows) are used during cooking. With the intent of improving our understanding of indoor air quality impacts of cooking-related pollutants, we created, posted and advertised a web-based survey about cooking activities in residences. The survey included questions similar to those in California's Residential Appliance Saturation Survey (RASS), relating tomore » home, household and cooking appliance characteristics and weekly patterns of meals cooked. Other questions targeted the following information not captured in the RASS: (1) oven vs. cooktop use, the number of cooktop burners used and the duration of burner use when cooking occurs, (2) specific cooking activities, (3) the use of range hood or window to increase ventilation during cooking, and (4) occupancy during cooking. Specific cooking activity questions were asked about the prior 24 hours with the assumption that most people are able to recollect activities over this time period. We examined inter-relationships among cooking activities and patterns and relationships of cooking activities to household demographics. We did not seek to obtain a sample of respondents that is demographically representative of the California population but rather to inexpensively gather information from homes spanning ranges of relevant characteristics including the number of residents and presence or absence of children. This report presents the survey, the responses obtained, and limited analysis of the results.« less
  • Sizing residential heating equipment has traditionally been based on weather design conditions, heating load, and field experience. This method is being restudied and changes will no doubt result. The American Gas Association Laboratories' Gas Appliance and Demonstration House was used to evaluate the feasibility of combining a pulse combustion space heater with a central furnace. The combination of these appliances, when operated in this 2500 ft/sup 2/ (232 m/sup 2/) house, met the total heating requirement. A high efficiency, pulse combustion space heater functions as the primary heating appliance. Data gathered during a ''Family Occupied'' period in the Gas Appliancemore » Research and Demonstration House are presented in addition to other case studies. The value of the approach and problems with it are discussed.« less
  • Water resides within carbonates as trapped fluid inclusions, adsorbed water, and as water bound within the crystal structure. Analysis by the CO[sub 2] equilibration method or micro-analysis of water by conversion of water directly to CO[sub 2] using guanidine hydrochloride requires hundreds of milligrams of carbonate for analysis. A viable alternative to these methods is the thermal decrepitation of carbonate for hydrogen isotopic analysis. Using this technique, water is generated by heating milligram-sized samples in vacuo at 625 C for 2 hours. Water is trapped cryogenically in evacuated glass tubing containing Zn and reacted according to established protocol for hydrogenmore » isotopic analysis. As a test of this technique, delta D and delta O-18 of synthetic nesquehonite (MgCO[sub 3] [center dot] 3H[sub 2]O) were determined. [delta] D values from thermally extracted water and the precipitating solution are identical within error for both normal and deuterium-spiked solutions at 9 and 23 C. [delta] O-18 values for solution water are identical to the measured delta O-18 of solution water. In addition the delta O-18 of nesquehonite, measured by standard H[sub 3]PO[sub 4] acid digestion is within 2[per thousand] of the predicted value using the paleotemperature equation for calcite and the delta O-18 and temperature of the precipitating solution. Conversely, measured delta O-18 values for water from the thermal decrepitation of large samples (> 500 mg), determined by the CO[sub 2] equilibration method, are enriched in O-18 compared with actual solution values while CO[sub 2] liberated during heating is depleted in O-18 compared with values calculated to be in equilibrium with solution. This suggests that isotopic exchange between H[sub 2]O and CO[sub 2] occurs at elevated temperature before these two oxygen-bearing components can be separated cryogenically.« less
  • We performed analyses of organic matter obtained from cores across Utah, Colorado, and Kansas. The results provide a detailed (30 cm sampling interval) record of organic matter preservation in the Turonian seaway during highstand (HST), lowstand (LST) and overlying transgressive systems tract (TST) deposition in the Western Interior Seaway. In general, total organic carbon (TOC) and carbonate (CaCO3) percentages decrease through the HST, with the highest values obtained from strata deposited during maximum transgression. Organic matter within the early- to mid-HST is dominantly marine algae with dinoflagellate and foraminiferal inputs. The late-HST contains small quantities of TOC and CaCO3, characterizedmore » as terrestrial organic debris; early-LST sediments have a signature similar to the late-HST. As one might expect, during sea-level fall the basin records mostly terrestrial inputs, whereas during sea-level rise a marine signature prevails. A similarity exists between late-LST and early-HST TOC and CaCO3 contents and is noteable for fluctuations between terrestrial and marine organic matter as indicated by Rockeval pyrolyses, organic petrography, and palynology. We surmise that during mid-HST and late-LST (i.e. during times of little or no variation in rate of sea-level change), the basin is poised to record fluctuations between terrestrial and marine-dominated sediment deposition which may be controlled by changes in climate.« less