NIST Technicalendar April 7 to April 11, 2008 The NIST Technicalendar is issued each Friday. All items MUST be submitted electronically from this web page by 12:00 NOON each Wednesday unless otherwise stated in the NIST Technicalendar. The address for online weekly editions of the NIST Technicalendar and NIST Administrative Calendar is: http://www.nist.gov/tcal/.

In this Issue: Meetings at NIST Meetings Elsewhere Announcements Talks by NIST Personnel NIST Web Site Announcements NIST Administrative Calendar (current)   NIST Vacancy Announcements (current)

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11:00 AM - Contraction-Expansion Flows of Concentrated Suspensions and Novel Biopolymer Gel Tracer Particles
3:00 PM - UCNA - Beta-Decay Asymmetry from Ultra-Cold Neutrons

No Scheduled Events

10:30 AM - Molecular-Based Design of Materials: The Quest for Super Infrastructure Materials
1:30 PM - Ontology Mapping - Statistical Semantic Similarity Analysis Approaches

9:00 AM - The Advisory Committee on Earthquake Hazards Reduction (ACEHR)
10:30 AM - Organic Electronic Materials and Devices: from Photoconductors to Solar Cells
10:45 AM - Dynamics of Nanomagnets Under the Influence of Spin Torque
12:00 PM - A Partial Solution to the Mystery of the Great Pyramids of Egypt

10:30 AM - Observing Climate with Satellites: Are We on Thin Ice?
2:00 PM - NOTE TIME CHANGE: Electron Spin Decoherence in Semiconductor Quantum Dots

4/7 -- MONDAY

11:00 AM - POLYMERS DIVISION SEMINAR: Contraction-Expansion Flows of Concentrated Suspensions and Novel Biopolymer Gel Tracer Particles
Intensive research efforts into flows of concentrated suspensions have yielded experimental data, continuum models and numerical simulations that are useful for suspension flows in simple geometries such as circular pipes. However, for many complex flow geometries, modeling calculations and experimental data are rare, even though such geometries are frequently encountered in materials processing operations. This talk will focus on an experimental investigation of concentrated suspension behavior in contraction-expansion flows, using nuclear magnetic resonance imaging (NMRI) and microfluidics measurement techniques. Results indicate that the effective viscosity ratios between various regions at the flow inlet are strongly correlated with important observed features of the system, such as recirculation region size and pressure drop. The development of novel biopolymer gel tracer particles also provides expanded capabilities in the study of suspensions, emulsions, and granular flows.
Nina Shapley , Professor at Columbia University, Department of Chemical Engineering, New York, NY, ncs2101@columbia.edu.
224 Bldg, Rm. A312. (NIST Contact: Kalman Migler, 301-975-4876, kalman.migler@nist.gov)

3:00 PM - IONIZING RADIATION DIVISION SEMINAR: UCNA - Beta-Decay Asymmetry from Ultra-Cold Neutrons
The UCNA experiment is designed to measure the asymmetry of the decay electrons from polarized neutron beta-decay. This is the first experiment to use trapped Ultra-Cold Neutrons (UCN) to measure decay correlations from neutron decay. The goal is to make a precise measurement ( 0.5%) of the asymmetry in order to test the electroweak standard model. The use of UCN is expected to provide significantly different (and reduced) systematic uncertainties. The results from the first, low-statistics, commissioning beta-decay data (from Fall 2007) will be discussed, as will the plans for the high precision run planned for 2008.
Brad Filippone , California Institute of Technology.
Bldg. 235, Rm. E100. (NIST Contact: Jeff Nico, 301-975-4663, jnico@nist.gov)


4/8 -- TUESDAY

No Scheduled Events

4/9 -- WEDNESDAY

10:30 AM - CERAMICS DIVISION SEMINAR: Molecular-Based Design of Materials: The Quest for Super Infrastructure Materials
Two recent events make it possible for revolutionary improvements in construction materials to occur. The first is the growing development and use of Molecular-Based Predictive Rheology. Using ab initio (Quantum Mechanics) and molecular dynamics simulations, the rheologic properties of a material can now be predicted with increasing accuracy based on the atomic and molecular structure of the material. Molecular-Based Predictive Rheology not only provides the ability to predict how a material responds to loads before the material in synthesized, it also provides in-depth insight into the interactions between atoms and molecules that determine this response. Thus it allows for the intelligent design of materials at the molecular level to achieve desired material behavior. The second event is the discovery of carbon nanotubes. Carbon nanotubes are very small, with diameters that range up to a few tens of nanometers, or on the order of a 1/thousandth the diameter of a human hair. They have been grown to lengths of several inches, and researchers are attempting to grow them still longer. They have unprecedented properties as the basis for construction materials. These include tensile strengths to 15.5 million psi, which is about 150-times that of high-strength steel, stiffness (Young's modulus) of 150 million psi, which is about 5-times that of steel, and densities that range from 1/6 to 1/3 that of steel. They have strength-to-weight ratios that range from about 450 to 900 times that of steel. Three recently-inaugurated U.S. Army Engineer Research and Development Center research programs seek to take advantage of these two events to change the paradigm of construction material development. The first two of these research programs are basic research programs that are further developing the science and tools of Molecular-Based Predictive Rheology, and then are using these tools to understand some of the phenomena relating the molecular make-up of carbon nanotube-based constructs to their rheologic properties. The third program is an applied research program that will use this understanding, and the predictive methods to design carbon nanotube-based filaments, membranes, and coatings to Technology Readiness Level 4 (TRL-4) that have tensile strengths of 1-million psi, with associated densities of about 1/5 that of steel. If successful, the developed materials will have about twice the strength-to-weight ratio of Kevlar, and about 5-times the tensile strength of very-high strength (4340 alloy) steel. These goals are to be met by 2010. At that time these laboratory materials may turn out to be prohibitively expensive, but then research will begin on how to make these materials cheaper. This talk will discuss some of the research associated with these programs.
Dr. Robert Welch , U.S. Army Corps of Engineers, Vicksburg, MS.
Materials Building, Rm. B351. (NIST Contact: Robert Cook, 301-975-3207, robert.cook@nist.gov)

1:30 PM - SIMA TECHNICAL SEMINAR: Ontology Mapping - Statistical Semantic Similarity Analysis Approaches
Interoperability allows two or more information sources (software components, computer systems, etc.) to exchange information and re-use information. The significance of information interoperability is indisputable in the engineering and manufacturing industries. One common approach is to develop interoperability standards with standardized terms and terminologies, thus providing the means of communication among similar application services. Current interoperability standards typically focus on specific domain with specific purpose and objective. Although they do provide the means of communication among the tools within a narrowly defined domain, current standards alone do not resolve the complex interoperability issues involving information and service integration across multiple disciplines; each has its own terminologies and its mode of operations. Currently, ontology mappings are typically observed and similar terms or concepts found manually. Our research explores a knowledge-driven mediation approach, thereby semantic similarities could be "discovered" in a semi-automated manner. This presentation discusses three semi-automated ontology mapping approaches, namely an attribute-based approach, a corpus-based approach and a term-based approach. These approaches use relatedness analysis techniques to discover related concepts from heterogeneous ontologies. Features are extracted using text mining techniques and then compared using statistical analysis methods. Three statistical analysis measures are used, namely cosine similarity, Jaccard similarity and market basket model, to evaluate the approaches. Preliminary results from industry-based standards will be presented to illustrate the utilization of the relatedness analysis approach for ontology mapping.
Kincho Law , Professor of Civil and Environmental Engineering, Stanford University.
220/Metrology Bldg, Rm. B125. (NIST Contact: Al Jones, 301-975-3554, jonesa@nist.gov)


4/10 -- THURSDAY

9:00 AM - BUILDING AND FIRE RESEARCH LABORATORY SEMINAR: The Advisory Committee on Earthquake Hazards Reduction (ACEHR)
National Earthquake Hazards Reduction Program (NEHRP) Advisory Committee on Earthquake Hazards Reduction (ACEHR) MEETING The Advisory Committee on Earthquake Hazards Reduction (ACEHR) will meet at NIST on April 10-11, 2008. As published in the March 19, 2008 federal register notice, the meeting will be open to the public, and the primary purpose of this meeting is to review the draft NEHRP Strategic Plan and discuss the Committee's report to the NIST Director. Please visit http://nehrp.gov/committees/index.htm for additional information.
Jack Hayes , NEHRP Director, Gaithersburg, MD, jack.hayes@nist.gov.
Administration Bldg, Employees Lounge. (NIST Contact: Tina Faecke, 301-975-5911, tina.faecke@nist.gov) http://nehrp.gov/

10:30 AM - ORGANIC ELECTRONICS INDUSTRIAL LECTURE SERIES: Organic Electronic Materials and Devices: from Photoconductors to Solar Cells
Organic electronics are being widely explored for applications in which low-cost and/or flexibility are desirable characteristics. In many of these applications, organics suffer a clear performance disadvantage compared to that of conventional, frequently silicon-based, technology, and the cost factor may not be sufficient to overcome the shortcomings. Drawing on examples from personal experience, and from the perspective of a scientist in company at the upper end of high tech, I will make suggestions about what is required for commercial success. These examples include organic photoconductors, organic light-emitting diodes (OLEDs), polymer memory, organic transistors and solar cells. It is critical to understand the chemistry, materials science and device physics so that both the capabilities and limitations can be assessed. Ultimately organics, like any other new technology, must either provide a novel enabling capability, (perhaps) like OLEDs, or a clear cost advantage with little or no performance hit, like photoconductors.
J. Campbell Scott , IBM Almaden Research Center.
224 Bldg, Rm. A312. (NIST Contact: Dean DeLongchamp, 301-975-5599, deand@nist.gov)

10:45 AM - NIST CENTER FOR NEUTRON RESEARCH SEMINAR: Dynamics of Nanomagnets Under the Influence of Spin Torque
Spin transfer (ST) between the spin polarized conduction electrons and magnetizations of the magnetic layers in nanofabriacted magnetic structures is perhaps the most promising mechanism for the manipulation of magnetoelectronic devices. Besides the potential practical importance, this effect enables us to study the aspects of magnetic dynamics in nanostructures that previously were not experimentally accessible. The speaker will give a brief introduction to ST, and describe the recent experiments addressing the new dynamical states that can be induced by ST. He will also discuss how ST can induce coupled dynamics of ferromagnets in nanostructures. He will relate the experimental results to our present understanding of the ST.
Sergei Urazhdin , West Virginia University. ,.
235 Bldg, Rm. E100. (NIST Contact: Joe Dura, 301-975-6251, joseph.dura@nist.gov)

12:00 PM - CERAMICS DIVISION SEMINAR: A Partial Solution to the Mystery of the Great Pyramids of Egypt
How the Great Pyramids of Giza were built has remained an enduring mystery. In the mid-Eighties Davidovits proposed that the pyramids were cast in situ using granular limestone aggregate and an alkali alumino-silicate-based binder. Hard evidence for this idea, however, remained elusive. Using primarily scanning and transmission electron microscopy, we compared a number of pyramid limestone samples to six different limestone samples from their vicinity. The pyramid samples contained microconstituents, µc's, with appreciable amounts of Si, in combination with elements, such as Ca and Mg, in ratios that do not exist in nature. The intimate proximity of the µc's suggests that at some time these elements had been together in a solution. Furthermore, between the natural limestone aggregates, the µc's with chemistries reminiscent of calcite and dolomite - not known to hydrate in nature - were hydrated. The ubiquity of Si and the presence of silica nanospheres in some of the micrographs strongly suggest that the solution was at one time basic. TEM confirmed that some of these Si-containing µc's were either amorphous or nanocrystalline, which is consistent with a relatively rapid precipitation reaction. The sophistication, and especially the endurance, of this ancient concrete technology is simply astounding. The historical, archeological, and technological implications of our conclusions to today's world are truly profound and will be touched upon.
Michel Barsoum , Drexel University.
Physics Building, Rm. B145. (NIST Contact: Sheldon Wiederhorn, 301-975-5772, sheldon.wiederhorn@nist.gov)


4/11 -- FRIDAY

10:30 AM - NIST COLLOQUIUM SERIES: Observing Climate with Satellites: Are We on Thin Ice?
The Earth's climate is determined by irradiance from the Sun and by properties of the atmosphere, oceans, and land that determine the reflection, absorption, and emission of energy within our atmosphere and at the Earth's surface. Since the 1970s, Earth-viewing satellites have complemented non-satellite geophysical information that together has led to an unprecedented understanding of the Earth's coupled ocean-land-atmosphere system. The speaker will discuss the elaboration of the Earth's climate system that has resulted from earth-viewing satellites and ground-based geophysical monitoring stations, review claims by climate change skeptics who argue against global warming, and show the unprecedented convergence of evidence for global warming in the past few years. He will also discuss recent concerns about warming-induced instabilities to the ice sheets of Greenland and Antarctica. Compton Tucker is a senior earth scientist at NASA's Goddard Space Flight Center. His research has involved studying global net primary production, measuring tropical deforestation, climatically-linked diseases, and glacier variations over time. He is the author of 140 journal articles on the use of satellite data to study the earth.
Compton Tucker , Goddard Fellow, NASA Goddard Space Flight Center.
Administration Building, Green Auditorium. (NIST Contact: Kum Ham, 301-975-4203, kham@nist.gov)
Special Assistance Available

2:00 PM - ATOMIC PHYSICS DIVISION SEMINAR: NOTE TIME CHANGE: Electron Spin Decoherence in Semiconductor Quantum Dots
Spins in semiconductor nanostructures are promising qubit candidates for a solid state quantum computer, and have seen truly impressive experimental progresses in the past few years. An important issue in spin-based quantum information processing is how a spin qubit couples to its spin environment. In this talk I will discuss some recent theoretical studies where we analyze the hyperfine coupling between electron and nuclear spins and the resulting coupled dynamics of electron and nuclear spins in a quantum dot. Specifically, I will discuss two decoherence mechanisms arising from the electron spin - nuclear spin interaction.
Xuedong Hu , State University of New York, Buffalo, NY.
Metrology Building, Room B365. (NIST Contact: Neil Zimmerman, 301-975-5887, neil.zimmerman@nist.gov)


ADVANCE NOTICE

4/14/08 10:00 AM - SURFACE AND MICROANALYSIS SCIENCE DIVISION SEMINAR: Characterization of Environmental Colloids & Nanoparticles using Field Flow Fractionation
For more than two decades environmental scientists are discovering the appearance and behavior of nanoparticles which are naturally occurring in the environment. Investigations were mainly driven by concerns of nanoparticle (or colloidal) mediated transport of radionuclides in the vicinity of nuclear waste deposits and bomb test sites. Apart from this we have learned about different roles of nanoparticles in the environment, not only for contaminant transport but also for important geochemical reactions in soils, sediments and surface waters. The investigation of those processes requires sophisticated methods which are able to cope with the heterogeneity of natural systems. Although it is clear that in most cases a natural colloidal system can only be characterized by a set of different methods (microscopy, light scattering, fractionation...) the application of field-flow fractionation (FFF) has given new insight into the appearance of environmental colloids. The talk will present the potentials and limitations of FFF and the information that can be gained from different fractionation and detection systems (size, shape, element distributions).
Dr. Frank von der Kammer , Department of Environmental Geosciences, University of Vienna.
227 Bldg, Room A202. (NIST Contact: David Holbrook, 301-975-5202, dave.holbrook@nist.gov)

4/17/08 10:30 AM - BIOPHYSICS SEMINAR: Laser Assisted Single-Molecule Refolding
In vivo, many RNA molecules can adopt multiple conformations depending on their biological context. For example, an RNA molecule that is initially in a stable hairpin conformation will at a later stage of its biological cycle interact with a second RNA molecule, which in turn will trigger a dimerization reaction of the two molecules. This is the case of the HIV Dimerization Initiation Sequence (DIS) and the DsrA RNA in bacteria. It is quite common that the initial interaction between the two RNAs takes place via complementary unpaired regions, forming a so-called kissing complex. However, the exact kinetic mechanism by which the two RNA molecules reach the dimerized state is still not well understood. To investigate the refolding energy surface of RNA molecules, we have developed new technology based on the combination of single molecule spectroscopy with laser induced temperature jump kinetics, called Laser Assisted Single-molecule Refolding (LASR). LASR enables us to induce folding reactions of otherwise kinetically trapped RNAs at the single molecule level, and to characterize their folding landscape. Single molecule time trajectories show that we can drive the dimerization reaction between two trapped kissing RNA hairpins with LASR and use this data to calculate folding enthalpies and entropies. Our LASR experiments indicate that the RNA kissing complex is a stable intermediate state that facilitates the dimerization reaction. LASR provides an exciting new approach to study molecular memory effects and kinetically trapped RNAs in general. LASR is readily applicable to study DNA and protein folding as well.
David Rueda , Department of Chemistry, Wayne State University, Detroit, MI.
Bldg 217, Room H107. (NIST Contact: Lori Goldner, 301-975-3792, lori.goldner@nist.gov)

4/18/08 10:30 AM - NIST COLLOQUIUM SERIES: The Making of "Absolute Zero"
"Absolute Zero", a unique blend of science, cultural history, and adventure, is a two hour TV documentary about how civilization has been profoundly affected by the search for ever lower temperatures. From 17th court magicians to superconductivity and Bose-Einstein condensation, it explores key concepts, significant individuals, and events in the field of low-temperature physics and the enormous impact that the mastery of cold has had on society through such technologies as refrigeration, air conditioning, and liquefied gases. The show premiered on BBC in 2007 to enthusiastic reviews, was featured on PBS-NOVA in the U.S. in January, 2008, and is being translated into several languages for broadcast to EU countries. The presentation reviews how the idea was conceived and how, through 7 years of hard work, it actually got accomplished.
Russell Donnelly , Principal Investigator, Absolute Zero and the Conquest of Cold, Dept of Physics, University of OR.
Administration Building, Green Auditorium. (NIST Contact: Kum Ham, 301-975-4203, kham@nist.gov)
Special Assistance Available

4/18/08 1:30 PM - CNST NANOFABRICATION RESEARCH GROUP SEMINAR: Cavity QED with Charged Quantum Dots
We report on nanodevices that for the first time allow for charge tuning of single InAs quantum dots located near the field maximum of high quality micropillar cavities. Through the innovation of a novel trench style cavity design, we are able to embed doped layers for electrical gating within a microcavity and obtain Q values greater than 50,000. Using these devices, we demonstrate record high single photon count rates with a capture efficiency of 38{\%} and a Purcell effect up to 8. We also show high frequency polarization modulation of single photons enabled by Stark shift tuning a charged quantum dot between two polarization modes of a slightly elliptical micropillar with frequencies up to 100 KHz. Furthermore, we demonstrate a charge tunable quantum dot coupled to a micropillar cavity mode, which is an important step in quantum communication protocols involving trapped single electrons or holes. This type of device enables a quick, non-destructive measurement of the spin state of the trapped charge.
Matthew Rakher , Graduate Student Researcher - UCSB Dept. of Physics, rakher@physics.ucsb.edu.
217 Bldg, H107 Rm.. (NIST Contact: Kartik Srinivasan, 301-975-5938, kartik.srinivasan@nist.gov)

5/1/08 10:30 AM - OFFICE OF TECHNOLOGY PARTNERSHIPS TECHNOLOGY TRANSFER SEMINAR SERIES: Scientists as Inventors: Engineers by Necessity
Throughout history, many scientists have emerged as some of the most creative engineers the world has ever seen by crafting solutions to technical problems that were barriers to their research. Sometimes by accident, sometimes reluctantly, often born of frustration, and always out of necessity, research scientists have frequently "engineered" their way around practical problems in observation and measurement that threatened to bring their research to a grinding halt. The results of their problem-solving were often embodied in innovative technology that later had profound impacts on society. Who can tell? Your invention might be among these. Acclaimed author, scholar and authority in engineering design and failure, Professor Henry Petroski uses his knowledge of innovation, invention, "The Evolution of Useful Things," and historic perspective to create for us some unique insights into the nature of invention. Professor Petroski received his bachelor's degree from Manhattan College in 1963 and his Ph.D. from the University of Illinois at Urbana-Champaign in 1968. He is a professional engineer registered in Texas, and a chartered engineer registered in Ireland. He has authored fourteen books and hundreds of newspaper, magazine, and technical journal articles. Professor Petroski has been a faculty member of the Duke University Pratt School of Engineering since 1980. Among his many honors are Member, National Academy of Engineering; Fellow, American Society of Civil Engineers; and Fellow, American Society of Mechanical Engineers.
Dr. Henry Petroski , A.S.Vesic Prof. of Civil Engineering Professor of History, Duke University, Durham, NC, petroski@duke.edu.
Administration Building, Green Auditorium. (NIST Contact: Jack Pevenstein, 301-975-5519, jack.pevenstein@nist.gov)

5/1/08 10:30 AM - CNST NANOTECHNOLOGY SEMINAR SERIES: The bright future of nanophotonics: recent advances and challenges
Nanophotonics in which light is manipulated at subwavelength scales is emerging as one the most exciting and potentially useful areas of physical optics. I will highlight recent research in my group aimed at a new class of light-sources in which the near field and the far-field properties are fundamentally altered by means of plasmonic nanostructures and metamaterials monolithically integrated on the laser facets. As a platform to demonstrate these new beam shaping concepts, such as reduction of beam divergence, nanospot light concentration, super-focusing and polarization control, we have used mid-infrared and near-IR lasers but these techniques are broadly applicable to all solid-state lasers. I will also discuss a novel technique called nanoskiving that combines photolithography, thin-film metal deposition, and thin-film sectioning, and demonstrate its capabilities in the realization of metallic nanowires with engineered plasmon resonances and frequency selective surfaces.
Federico Capasso , Professor-Harvard University, Cambridge, MA, mullaney@seas.harvard.edu.
215 Bldg, C103- C106 Rm.. (NIST Contact: Nikolai Zhitenev, 301-975-6039, nikolai.zhitenev@nist.gov)

5/16/08 1:30 PM - CENTER FOR NANOSCALE SCIENCE AND TECHNOLOGY SEMINAR: Spin Wave Beams, Precessing Vortices, and Localized Standing Waves in Single Layer Nanocontacts
The recently discovered spin transfer effect enables the application of localized torques in magnetic thin film nanostructures. In the point contact geometry, this effect can result in large amplitude spin wave generation. The well studied Slonczewski model of spin torque in trilayer nanostructures is the Landau-Lifshitz equation modified with a local spin torque term. In this talk, a non-local model of point contacts in single layer thin magnetic films is presented and studied numerically in two spatial dimensions. Here, the spin torque term in the Landau-Lifshitz equation is non-local and is due to spin diffusion effects. A variety of quasi-periodic mode solutions to this equation are found including localized standing waves, vortex spiral waves, and a weakly diffracting collimated beam of spin waves, the direction of which can be steered by changing the direction of an applied magnetic field. The spin wave beam appears to be the nonlinear hybridization of the vortex spiral waves and the localized standing wave. Mode selection is explained using linear spin wave theory.
Dr. Mark Hoefer , Magnetics Group, National Institute of Standards and Technology.
Building 217, Room H107. (NIST Contact: Mark Stiles, 301-975-3745, mark.stiles@nist.gov)

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MEETINGS ELSEWHERE


4/7 -- MONDAY

No Scheduled Events

4/8 -- TUESDAY

No Scheduled Events

4/9 -- WEDNESDAY

No Scheduled Events

4/10 -- THURSDAY

No Scheduled Events

4/11 -- FRIDAY

No Scheduled Events

ADVANCE NOTICE

No Scheduled Events

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TALKS BY NIST PERSONNEL

COOKSEY, C. : TERAHERTZ SPECTROSCOPY OF BIOMOLECULES IN AQUEOUS MICELLES.
American Chemical Society National Meeting, Ernest Morial Convention Center, New Orleans LA, 4/7.

MASON, S. : PB(II) SORPTION ON HYDRATED OXIDE SURFACES.
American Chemical Society National Meeting, Ernest Morial Convention Center, New Orleans LA, 4/7.

VANDERHART, D. : SYNTHETIC MICA: A PROMISTING SUBSTRATE FOR THIN FILM STUDIES BY SOLID STATE PROTON.
American Chemical Society Meeting, New Orleans, LA, 4/7.

BERGERON, D. : PRECISE MECHANISMS OF FORMATION AND DEGRADATION OF MONOLAYER PROTECTED GOLD NONOPARTICLES VIA ELECTROSPRAY IONIZATION MASS SPECTROMETRY.
American Chemical Society National Meeting, New Orleans, LA, 4/7.

SHEN, V. : COMPARING THE GIBBS ENSEMBLE AND GRAND-CANONICAL TRANSITION-MATRIX METHODS IN THE DETERMINATION OF PHASE EQUILIBRIA.
American Chemical Society/American Institute of Chemical Engineers Spring Meeting, New Orleans, LA, 4/7.

BURGESS JR., D. : ENTHALPIES OF FORMATION OF AROMATIC MOLECULES.
235th American Chemical Society National Meeting, New Orleans, LA, 4/7.

ALVINE, K. : INSTABILITY IN NANOIMPRINTED PATTERNS.
American Chemical Society Spring Meeting, New Orleans, LA, 4/8.

ANTONUCCI, J. : BIOACTIVE POLYMERIC ACP COMPOSTIES UTILIZING ETHYL-ALPHA-HYDROXYMETHYLACRYLATE.
ACS Annual Meeting, New Orleans, LA, 4/9.

ANTONUCCI, J. : MOLECULAR DYNAMICS OF A DENTAL MONOMER X ITS POLYMER.
ACS Annual Meeting, New Orleans, LA, 4/9.

BERRY, B. : COLD ZONE ANNEALING OF BLOCK COPOLYMERS IN TOPOGRAPHICALLY PATTERNED SUBSTRATES.
American Chemical Society Meeting, New Orleans, LA, 4/9.

KARIM, A. : EVOLUTION OF ORIENTATION ORDER IN DIRECTED ASSEMBLY OF BLOCK COPOLYMER FILMS.
American Chemical Society Meeting, New Orleans, LA, 4/9.

SOLES, C. : MONITORING ALIGNMENT OF OSTEOBLAST CELLS BY DIRECTED GRADIENT PATTERNS.
American Chemical Society Meeting, New Orleans, LA, 4/10.

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ANNOUNCEMENTS

NIST SCANNING PROBE MICROSCOPY ISO STANDARDS ADVISORY GROUP FORMING
ISO/TC201/SC9 was launched in 2004 to develop documentary standards for scanning probe microscopy. Initially chartered with five study groups, NIST was requested by ANSI to supply a US delegate to SC9 to chair a study group on scan-parameter and environmental artifacts in AFM imaging. In order to optimize the activities of this study group, the SG3 Chair is trying to develop a forum for greater input from the many other NIST staff involved in scanned probe microscopy and AFM in particular. An informal meeting is tentatively scheduled for April 24 at 1:30 PM in 219/A045. Interested persons are also encouraged to contact the chair individually for more information.
NIST Contact: Ronald Dixson, 301-975-4399, ronald.dixson@nist.gov

VISITOR REGISTRATION FOR NIST EVENTS
Because of heightened security at the NIST Gaithersburg site, members of the public who wish to attend meetings, seminars, lectures, etc. must first register in advance. For more information please call or e-mail the "NIST Contact" for the particular event you would like to attend.
NIST Contact: . ., ., .

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NIST WEB SITE ANNOUNCEMENTS

No Web Site announcements this week.

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For more information, contact Ms. Sharon Hallman, Editor, Stop 2500, National Institute of Standards and Technology, Gaithersburg MD 20899-2500; Telephone: 301-975-TCAL (3570); Fax: 301-926-4431; or Email: tcal@nist.gov.

All lectures and meetings are open unless otherwise stated.

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