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Physical Reference Data of the NIST Physics Laboratory

Bob Dragoset Physics Laboratory. Physical Reference Data of the NIST Physics Laboratory. Presentation for the DASER Symposium Digital Archives for Science & Engineering Research Saturday, November 22, 2003. Physical Reference Data.

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Physical Reference Data of the NIST Physics Laboratory

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  1. Bob Dragoset Physics Laboratory Physical Reference Dataof the NIST Physics Laboratory Presentation for the DASER Symposium Digital Archives for Science & Engineering Research Saturday, November 22, 2003

  2. Physical Reference Data • Office of Electronic Commercein Scientific and Engineering Data,NIST Physics Laboratory • Karen Olsen, programming • Gloria Wiersma, HTML editing • Nearly 30 online databases covering: • Fundamental Physical Constants • Atomic and Molecular Spectroscopy • Electron-Impact Atomic Cross Sections • X-ray Attenuation and Absorption • First database online June 1994

  3. internal server public server Data Storage & Integrity • Public & internal web servers • Dual, mirrored disk drives • Daily backup of internal web server • Automatic monitoring of unauthorized file modification on public web server • All files for each new or updated databaseare archived on CDs and stored outside NIST. • Firewalls are configured for minimal accessto public web server.

  4. Data Input • ASCII files • Fixed-column • Tab-delimited • LaTeX to gif for equation images • Scanned legacy documents • Data entry through web interfaces • Scripts & programs for processing data • Automatic daily updating • MySQL and PHP (open source)

  5. Data Output • Dynamic web pages • HTML tables • ASCII files • fixed-column • tab-delimited • User-selected output options • PDF files generated "on-the-fly" • Custom data graphs • Dynamic calculations of user-defined compounds and mixtures

  6. Fundamental Physical Constants 260,000 page requests / month Searchable Bibliography 3600 references Atomic Spectra Database 2.0 72,000 spectroscopic lines 66,000 energy levels 90,000 page requests / month Physical Reference Data http://physics.nist.gov/data

  7. Microwave Molecular Spectral Databases diatomics (121), triatomics (55), & hydrocarbons (91) 30,000 spectral lines 23,000 page requests / month Electron-Impact Cross Sections 70 molecules & 2 atoms (updated soon) theory comparison with experiments 25,000 page requests / month Physical Reference Data (cont.) http://physics.nist.gov/data

  8. Extensive evaluation method for determining values of the constants http://physics.nist.gov/constants

  9. DATA INPUT Choose reference source Choose Journal (e.g., pr) Enter info (TeX if needed) title first & last pages year authors keywords Editing screen available showing HTML & TeX Scientist proofs Secretary: final approval Database automatically updated daily DATA OUTPUT HTML output PDF output Generate PostScript by running LaTeX with BibTeX references (39,000 line file) Distill PostScript file http://physics.nist.gov/constantsbib

  10. Data Input Data entered into Oracle database from uploaded data files. ASCII output from Oracle database put into Ctree database and data massaged. ASCII output from Ctree database used by Korn shell & PERL scripts for web output. Ctree was used because NIST originally offered a PC-based product containing the data. http://physics.nist.gov/asd

  11. DATA OUTPUT • Many user-selected options, including: • ASCII fixed-column • HTML & paged HTML • User options are listed in the URL, which can be bookmarked. • Options stored without using "banned" cookies.

  12. The "Atoms" portion of the new version of the database was designed using MySQL database & PHP programming language, both Open Source. Manual check required. http://physics.nist.gov/ionxsec

  13. DATA INPUT: Legacy data • Scanning, OCR, & manual labor used to generate hundreds of molecular constants tables in HTML. • Errors found and corrected by running scripts on electronic data file. http://physics.nist.gov/molspec

  14. DATA OUTPUT • Search & retrieval using several data fields, including: • molecule • telescope • reference • empirical formula http://physics.nist.gov/restfreq

  15. For More Information Bob Dragoset National Institute ofStandards and Technology dragoset@nist.gov http://physics.nist.gov

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