16,764 research outputs found
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No full textFrom left: Miss Nun Dundan; Bill Harney; Albert Namatjira; Ms. Ozzie Jenson; Mr Gordon Sweeney. 1950s, taken in front of Darwin Administration offices.Sweeney, K.Date:1950
Personal Papers (MS 80-0002)
No full textLetter from Isaac H. Kempner to F. L. Gordon discussing his recovery after loosing sight in one of his eyes
Cycloaddition of Benzene on Si(100) and Its Surface Conversions
No full textA comprehensive ab initio study of the adsorption of benzene on the silicon(100) surface is presented. Five potential candidates ([2+2] adduct, [4+2] adduct, two tetra-σ-bonded structures, and one radical-like structure) for the reaction product are examined to determine the lowest energy adsorption configuration. A [4+2] butterfly structure is determined to be the global minimum (−29.0 kcal/mol), although one of the two tetra-σ-bonded structures (−26.7 kcal/mol) is similar in energy to it. Multireference perturbation theory suggests that the [4+2] addition mechanism of benzene on Si(100) is very similar to the usual Diels−Alder reaction (i.e., small or zero activation barrier), even though benzene adsorption entails the loss of benzene aromaticity during the reaction. On the other hand, the [2+2] cycloaddition mechanism is shown to require a relatively high activation barrier (17.8 kcal/mol), in which the initial step is to form a (relatively strongly bound) van der Waals complex (−8.9 kcal/mol). However, the net activation barrier relative to reactants is only 8.9 kcal/mol. Careful examination of the interconversion reactions among the reaction products indicates that the two tetra-σ-bonded structures (that are energetically comparable to the [4+2] product) can be derived from the [2+2] adduct with activation barriers of 15.5 and 21.4 kcal/mol. However, unlike the previous theoretical predictions, it is found that the conversion of the [4+2] product to the tetra-σ-bonded structures entails huge barriers (>37.0 kcal/mol) and is unlikely to occur. This suggests that the [4+2] product is not only thermodynamically the most stable configuration (lowest energy product) but also kinetically very stable (large barriers with respect to the isomerization to other products).Reprinted (adapted) with permission from Journal of the American Chemical Society 127 (2005): 3131, doi:10.1021/ja0402093. Copyright 2005 American Chemical Society.</p
MS 045 Guide to Sidney Gordon Ohlhausen, MD Papers (1930-1952)
No full textSidney Gordon Ohlhausen, MD papers contains newspaper clippings, correspondence, biographical information including medical education and military service, documents relating to activities and hobbies including Lakeside Country Club, the Republican Party, and a copyright for a genealogical book related to Sidney Ohlhausen and his career as a family practitioner. See more at MS 045
Adsorption of Water on the Si(100) Surface: An Ab Initio and QM/MM Cluster Study
No full textThe adsorption of water on the Si(100) surface is investigated using ab initio quantum chemical cluster calculations. A reaction profile is constructed using the multiconfigurational SCF method. The calculations demonstrate that the reactant should be described with a multireference wave function in order to obtain correct energetics, because it contains a bare dimer with significant diradical character. The system becomes almost single-configurational as water approaches the surface and forms a molecularly adsorbed intermediate. Therefore, except for the reactant, a single-configurational wave function seems to be sufficient for a correct description of the reaction. The adsorbed OH group in an isolated product can nearly freely rotate between the trans and gauche minima. Interactions between the OH groups and the dangling bonds are small and do not appear to change the OH orientation. However, the interdimer hydrogen bonding is stronger and forces the OH orientation to be perpendicular to the dimer bond. The free rotation of the OH group in an isolated dimer model and the hydrogen-bonding picture in an extended cluster model are consistent with the experimental finding for the OH orientation in the product. Si9H12, Si15H16, Si32H28, Si48H36, and Si64H44cluster models for the Si(100) surface are used, and the SIMOMM (surface integrated molecular orbital molecular mechanics) method is used effectively for these large cluster calculations. The SIMOMM and full quantum results are compared.Reprinted (adapted) with permission from Journal of Physical Chemistry B 105 (2001): 4039, doi:10.1021/jp003434p. Copyright 2001 American Chemical Society.</p
Ms. Courtney Chartier, RWWL AUC, August 2011
No full textThis video is a conversation with Ms. Courtney Chartier. Ms. Chartier talks about her work on the "New Georgia Encyclopedia" and "Online Voter Education Project." Andrea Jackson, AUC Woodruff Library, is the interviewer
Ms. Neely Terrell, RWWL AUC, March 2012
No full textThis video is a conversation with Ms. Neely Terrell. Ms. Terrell talks about her book, "Super Singles Activate". Anthony Kinsey and Jahnesta Horney, AUC Woodruff Library, are the interviewers
Gordon W. Day
No full textGORDON W. DAY
Inducted: 2004
Citation:
For leadership in research in fundamental optical measurements, development of standards for optical fiber, new concepts in instrumentation, and founding of the NIST Optoelectronics division
Tenure: 1969-2003
Birth: 1944, Jacksonville, Illinois
Education:
University of Illinois, Urbana-Champaign, BS (Electrical Engineering), 1966, MS (Electrical Engineering), 1967, PhD (Electrical Engineering), 1970
Positions held:
NBS/NRC Postdoctoral Research Associate
Electronics Engineer, Radio Standards Physics, Quantum Electronics, Electromagnetics, and Electromagnetic Technology Divisions
Visiting Fellow, University of Southampton (UK), on assignment from NBS
Project Leader, Optical Fiber Sensors, Electromagnetic Technology Division
Deputy Division Chief, Electromagnetic Technology Division
Division Chief (first), Optoelectronics Division
Honors:
U.S. Department of Commerce, Gold Medal 1974; Silver Medal 1983
IR‑100 Award, Industrial Research Magazine, 1976; R&D-100 Award, R&D Magazine, 1991
Excellence in Technology Transfer Award, Federal Laboratories Consortium, 1992
President, IEEE Lasers and Electro-Optics Society (LEOS), 2000
Memberships:
Institute of Electrical and Electronics Engineers (Fellow)
Optical Society of America (Fellow)
Institute of Physics, UK (Fellow)
Publications:
Approximately 150 publications, including:
“Speed of light from direct frequency and wavelength measurements of the methane stabilized laser,” (with co-authors), Phys. Rev. Lett., 29, 1346 (1972)
“An electrically calibrated pyroelectric radiometer system,” (with co-authors), NBS Technical Note 678, (1976)
“Optical fiber characterization,” (with co-authors), NBS Special Pub. 637, vols. 1&2, (1982)
“Annealing of linear birefringence in single mode fiber coils: application to optical fiber current sensors, (with co-authors),” IEEE/OSA J. Lightwave Tech. 9 1031-1037 (1990
Ms. Felesha Love, Spelman College, January 2016
No full textThis video is a conversation with Felesha Love. Ms. Love talks about her book, "Brave Leap to Freedom: Integrating Mind, Body, and Spirit to Cultivate Healthy Relationships". Jordan Moore, AUC Woodruff Library, is the interviewer
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