Conferences, Lectures, & Seminars
Events for January
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Lyman Handy Colloquium
Thu, Jan 12, 2006 @ 12:30 PM
Mork Family Department of Chemical Engineering and Materials Science
Conferences, Lectures, & Seminars
Aberration Corrected Electron Microscopy: What are the New Perspectives for Materials Sciences?Dr. C. Kisielowski
National Center for Electron Microscopy, LBNL
Berkeley CA ABSTRACT Ongoing technological advancements of electron microscopy will reshape the way electron scattering is utilized to investigate structure and composition of materials down to the atomic level. It foreseeable (and partly established) that electron microscopes will have the ability to image single atoms of most elements of the periodic table of elements and to tie the spatial information to spectroscopy, which probes for chemical constituents and local bonding. Therefore, a three-dimensional materials characterization can reach towards atomic resolution and it is feasible to solve the long-standing problem of information loss that comes from projecting the 3D materials structure into a 2D image plane.
This talk highlights how much materials science already benefits from recent advancement of instrumentation. Application examples include a characterization of a dislocation in GaAs in terms of displacement fields and impurity segregation, investigations of strain relaxation processes in FePt nanoparticles, and investigations of local band gap fluctuations that are induced by indium clusters in GaN/InGaN/GaN quantum wells. The given examples also point to current limitations that will be removed by the next generation of fully aberration corrected microscopes, which are currently developed within the DoE s TEAM-Project.Thursday, January 12, 2006
Seminar at 12:30 p.m. - OHE 122
Refreshments served after the seminar in HED Lobby
The Scientific Community is Cordially Invited
Location: Olin Hall of Engineering (OHE) - 122
Audiences: Everyone Is Invited
Contact: Petra Pearce
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Materials Science Seminar
Fri, Jan 13, 2006 @ 02:45 PM - 03:30 PM
Mork Family Department of Chemical Engineering and Materials Science
Conferences, Lectures, & Seminars
From Nature to Engineering: Biotechnology, Biomimetics, and Bio-Inspiration Opens Novel Routes to Metal Oxide Semiconductors.David J. KisailusMaterials Research Laboratory/ California NanoSystems Institute/
Institute for Collaborative Biotechnologies
University of California Santa Barbara We discovered that the specific proteins found in marine sponges that enzymatically produce silica (i.e., âsilicateinsâÂ), catalyze and structurally direct the hydrolysis and polycondensation of the molecular precursors of such metal oxides as gallium oxide, titanium dioxide, and zinc oxide. These are the first reported examples of enzyme-catalyzed, nanostructure-directed synthesis of these materials â" and the first such syntheses at low temperature and neutral pH. Interestingly, interaction with the template-like protein surface is capable of stabilizing polymorphs of these materials that otherwise are not normally observed at low temperatures. Thus, for example, nanocrystallites of anatase titanium dioxide and gamma-gallium oxide are formed on the protein at room temperature. Perhaps most remarkably, in some of these cases the interaction between the condensing metal oxide and the protein results in preferential alignment of the resulting nanocrystallites of the mineral, suggesting an epitaxial-like relationship between the mineral crystallite and specific functional groups on the templating protein surface. Recent results confirm our suspicions that the underlying protein has a crystalline structure capable of producing a repetitive crystalline template upon which the metal oxide may order.
Biomimickry is currently being used to catalyze and template the growth of various metal oxides. We are incorporating analogs of the critical amino acid residues found in silicateinâs catalytic active site, anchoring these functional groups (via self-assembled monolayers on gold) adjacent to one another to facilitate catalytic activity by the same mechanism exhibited by the enzyme. Results have shown that biomimetics of the active site in silicatein are capable of producing silica from alkoxide precursors at neutral pH.
We presently are attempting to extend the genetic engineering approach described above to identify and then harness the natural structure-directing determinants of the protein and use the key control mechanisms identified in biomineralizing organisms towards the low-temperature, benign synthesis of nanostructured materials for optical and electrical materials, sensors, and pharmaceuticals.January 13, 2005
2:45-3:30 PM
(Refreshments will be served at 2:30 PM)
VHE 217
Location: Vivian Hall of Engineering (VHE) - 217
Audiences: Everyone Is Invited
Contact: Petra Pearce
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Materials Science Seminar
Fri, Jan 20, 2006 @ 02:45 PM - 03:30 PM
Mork Family Department of Chemical Engineering and Materials Science
Conferences, Lectures, & Seminars
Raj MohantyBoston Univ.
Location: Vivian Hall of Engineering (VHE) - 217
Audiences: Everyone Is Invited
Contact: Petra Pearce
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Graduate Seminar
Tue, Jan 24, 2006 @ 12:00 PM
Mork Family Department of Chemical Engineering and Materials Science
Conferences, Lectures, & Seminars
Graduate Seminar"Subspace Identification Using the Parity Space"Jin Wang, Ph.D., P.E.
Advanced Micro Devices, IncABSTRACT Subspace identification methods (SIMs) have been one of the main streams of research in system identification. Compared to the prediction error methods (PEMs), SIMs have a better numerical reliability and a modest computational complexity, particularly when the number of outputs and states is large. However, most of the SIMs, like other more traditional PEMs, consider output errors only and assume the input variables are noise-free. Therefore, under the errors-in-variables (EIV) situation, most of the existing SIMs gives biased estimates. Besides, due to the correlation between the input and the unmeasured disturbance under feedback control, many subspace algorithms do not work on closed-loop data, even though the data satisfy identifiability conditions for prediction error methods.
In this talk, I will present a new subspace identification method using the parity space employed in fault detection in the past. The basic algorithm, known as subspace identification method via principal component analysis (SIMPCA), gives consistent estimation of the deterministic part and stochastic part of the system, for both closed-loop and errors-in-variables situation. Two modifications, SIMPCA with column weighting and SIMPCA with modified instrumental variables, are developed to further improve the efficiency/accuracy of SIMPCA. Simulation examples are given to illustrate the performance of the proposed algorithms.Tuesday, January 24, 2006
Seminar at 12:00 p.m.
SGM 101
The Scientific Community is Cordially InvitedLocation: Seeley G. Mudd Building (SGM) - 101
Audiences: Everyone Is Invited
Contact: Petra Pearce
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Mork Family Department of Chemical Engineering and Material Science Centennial Celebration
Thu, Jan 26, 2006 @ 10:00 AM - 05:00 PM
Mork Family Department of Chemical Engineering and Materials Science
Conferences, Lectures, & Seminars
Showcasing Research at Mork Family Department of Chemical Engineering and Material Science Grad Students Posters 10 a.m. 12 noon Hedco 116 Refreshments will be served Invited Lectures: Gerontology Auditorium:
2:00-4:15 Fueling the Future: Opportunities and Challenges in Energy and the Environment" Professor Lyn Orr, Stanford UniversityMolecular Mechanics of Bone Fracture; Professor Paul Hansma, University of California, Santa Barbara 4:30-5:30 ReceptionLocation: Posters at Hedco 116 - Lectures at Gerontology Auditorium
Audiences: Everyone Is Invited
Contact: iraj ershaghi
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Materials Science Seminar
Fri, Jan 27, 2006 @ 02:45 PM - 03:30 PM
Mork Family Department of Chemical Engineering and Materials Science
Conferences, Lectures, & Seminars
THE MORK FAMILY DEPARTMENT OF CHEMICAL ENGINEERING AND MATERIALS SCIENCEPRESENTS A SEMINAR
BYProfessor Joanna Groza
Department of Chemical Engineering and Materials Science
UC DavisELECTRICAL FIELD ENHANCED SINTERING AND REACTIONSABSTRACTThe application of an electrical field has been shown to influence a variety of materials processes such as crystal defect motion, crystal nucleation and growth, evaporation and oxidation processes. At UCD, electrical field/current application has been used to enable distinctive processing features such as enhanced sintering of powders (minutes as compared to hours in conventional sintering), synthesis of ceramic compounds (e.g., FeCr2S4 synthesized in January 27, 2006
2:45-3:30 PM
(Refreshments will be served at 2:30 PM)
VHE 217**ALL FIRST YEAR MATERIALS SCIENCE MAJORS ARE REQUIRED TO ATTEND**
Location: Vivian Hall of Engineering (VHE) - 217
Audiences: Everyone Is Invited
Contact: Petra Pearce