| Exploring the Variable Sky with Linear. 1. Photometric Recalibration with the Sloan Digital Sky Survey |
Dec 2011 |
14 pages |
| Authors:
Branimir Sesar; J S Stuart; Zeljko Ivezic; Dylan P Morgan; Andrew C Becker; Przemyslaw Wozniak; CALIFORNIA INST OF TECH PASADENA
|
 | We describe photometric recalibration of data obtained by the asteroid survey LINEAR. Although LINEAR was designed for astrometric discovery of moving objects, the data set described here contains over 5 billion photometric measurements for about 25 million objects, mostly stars. We use Sloan Digital Sky Survey (SDSS) data from the overlapping approx. 10,000 deg(2) of sky to recalibrate LINEAR photometry and achieve errors of 0.03 mag for sources not limited ... |
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| Marine Aerosols: Hygroscopocity and Aerosol-Cloud Relationships |
30 Sep 2011 |
9 pages |
| Authors:
John H Seinfield; CALIFORNIA INST OF TECH PASADENA
|
| The objective of the project is to improve our understanding of the role of aerosols in the Marine Boundary Layer and our ability to simulate marine stratocumulus clouds as a function of aerosol properties and the large-scale meteorology. |
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| Dynamic Resource Allocation in Conservation Planning |
Aug 2011 |
7 pages |
| Authors:
Daniel Golovin; Andreas Krause; Beth Gardner; Sarah J Converse; Steve Morey; CALIFORNIA INST OF TECH PASADENA
|
| Consider the problem of protecting endangered species by selecting patches of land to be used for conservation purposes. Typically, the availability of patches changes over time, and recommendations must be made dynamically. This is a challenging prototypical example of a sequential optimization problem under uncertainty in computational sustainability. Existing techniques do not scale to problems of realistic size. In this paper, we develop an efficient algorithm for adaptively making recommendations ... |
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| Advanced Nanomaterials from Functional Cyclic Polymers |
31 MAY 2011 |
8 pages |
| Authors:
Robert H. Grubbs; Andrew J. Boydston; CALIFORNIA INST OF TECH PASADENA
|
| The primary objective of this research program is to explore new possibilities for functional cyclic polymers in materials science. The exploration of new materials based upon cyclic polymer architectures has been stifled due to a general inability to produce cyclic polymers of high purity and controlled molecular weight on a large scale. During the funding period, we have significantly improved the synthetic capabilities toward cyclic polymers by developing catalyst and ... |
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| Proposal to Process and Analyze LCC Crashback Propeller Deformation Data |
08 Mar 2011 |
4 pages |
| Authors:
Morteza Gharib; CALIFORNIA INST OF TECH PASADENA
|
| A DDPIV system was designed and constructed to work in the LCC. A large set of 3D images were taken during two weeks of testing at the LCC in April. The most important cases have been processed, and some of the previously processed cases were re-processed to include the time dependence of the blade deflection. This extra information will be used to better remove the apparent blade motion coming from ... |
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| User-Friendly Tail Bounds for Matrix Martingales |
16 Jan 2011 |
15 pages |
| Authors:
Joel A Tropp; CALIFORNIA INST OF TECH PASADENA
|
| This report presents probability inequalities for sums of adapted sequences of random self-adjoint matrices. The results frame simple, easily verifiable hypotheses on the summands, and they yield strong conclusions about the large-deviation behavior of the maximum eigenvalue of the sum. The methods also specialize to sums of independent random matrices. |
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| Establishing Alpha Oph as a Prototype Rotator: Improved Astrometric Orbit |
10 Jan 2011 |
7 pages |
| Authors:
Sasha Hinkley; John D Monnier; Ben R Oppenheimer; Jr Roberts Lewis C; Michael Ireland; Neil Zimmerman; Douglas Brenner; Ian R Parry; Frantz Martinache; Olivier Lai; CALIFORNIA INST OF TECH PASADENA
|
| The nearby star alpha Oph (Ras Alhague) is a rapidly rotating A5IV star spinning at approximately 89% of its breakup velocity. This system has been imaged extensively by interferometric techniques, giving a precise geometric model of the star's oblateness and the resulting temperature variation on the stellar surface. Fortuitously, alpha Oph has a previously known stellar companion, and characterization of the orbit provides an independent, dynamically based check of both ... |
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| Aerosol-Cloud-Radiation Interactions in Atmospheric Forecast Models |
30 Sep 2010 |
6 pages |
| Authors:
John H Seinfeld; CALIFORNIA INST OF TECH PASADENA
|
| The long-term goal of this research is to gain a deeper understanding of how atmospheric aerosols affect the transmission of radiation through the atmosphere and influence cloud properties. The scientific objectives of this project are to identify the specific manner in which atmospheric aerosols determine cloud properties and to represent these interactions in atmospheric models. The technological objective is to develop state-of-the-art instruments for aircraft sampling of aerosols that advance ... |
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| Spitzer Observations Of IC 2118 |
01 Sep 2010 |
19 pages |
| Authors:
S Guieu; L M Rebull; J R Stauffer; F J Vrba; A Noriega-Crespo; T Spuck; T R Moody; B Sepulveda; C Weehler; A Maranto; D M Cole; N Flagey; R Laher; B Penprase; S Ramirez; S Stolovy; CALIFORNIA INST OF TECH PASADENA
|
| IC 2118, also known as the Witch Head Nebula, is a wispy, roughly cometary, 5 degree long reflection nebula,and is thought to be a site of triggered star formation. In order to search for new young stellar objects (YSOs), we have observed this region in seven mid- and far-infrared bands using the Spitzer Space Telescope and in four bands in the optical using the U. S. Naval Observatory 40 inch ... |
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| Specification, Design and Verification of Distributed Embedded Systems |
12 Aug 2010 |
10 pages |
| Authors:
Manl Chandy; John Doyle; Richard Murray; Eric Klavins; Pablo Parrilo; CALIFORNIA INST OF TECH PASADENA
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| Large Eddy Simulations of Supercritical Mixing Layers for Air Force Applications |
May 2010 |
139 pages |
| Authors:
Josette Bellan; CALIFORNIA INST OF TECH PASADENA
|
| This report describes a study performed under AFOSR sponsorship, addressing the investigation of mixing and fluid disintegration under supercritical turbulent flow conditions. Because the study has been very fruitful and produced a very large amount of information, including major publications in refereed journals, this final report is in the form of an Executive Summary succinctly describing the results, with particular emphasis on the connection among the publications or manuscripts which ... |
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| Cavity Opto-Mechanics using an Optically Levitated Nanosphere |
19 Jan 2010 |
7 pages |
| Authors:
D E Chang; C A Regal; S B Papp; D J Wilson; J Ye; O Painter; H J Kimble; P Zoller; CALIFORNIA INST OF TECH PASADENA
|
| Recently, remarkable advances have been made in coupling a number of high-Q modes of nano-mechanical systems to high-finesse optical cavities, with the goal of reaching regimes in which quantum behavior can be observed and leveraged toward new applications. To reach this regime, the coupling between these systems and their thermal environments must be minimized. Here we propose a novel approach to this problem, in which optically levitating a nano-mechanical system ... |
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| Effect of Wall Sheaths on Ion Trajectories in a Hall Thruster Numerical Model |
Sep-2009 |
12 pages |
| Authors:
Regina M Sullivan; Joseph E Shepherd; Michelle K Scarfe; Ioannis G Mikellides; Lee K Johnson; CALIFORNIA INST OF TECH PASADENA
|
| A 2D framework for solving the sheath equations near a dielectric corner has been developed and applied in a quasi 2D fashion to solve for sheath thickness and potential profile. When appropriate, boundary conditions were taken from an HPHall model of an SPT-70 Hall thruster. Ion paths within the sheath were also calculated. Results suggest that the radial acceleration provided by the sheath has the ability to produce significant changes ... |
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| A New Paradigm in Modeling and Simulations of Complex Oxidation Chemistry Using a Statistical Approach |
31-Mar-2009 |
66 pages |
| Authors:
Josette Bellan; CALIFORNIA INST OF TECH PASADENA
|
| This report describes a study performed under ARO sponsorship, addressing the investigation of a novel way to reduce complex and extensive oxidation reaction mechanisms containing hundreds of species to a much smaller number of progress variables, typically by a factor of ten. Because the results have been documented in several manuscripts, this final report is in the form of an Executive Summary succinctly describing the results and putting them in ... |
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| First Principles Hierarchical Selection and Testing of Anion Receptors for High Specific Energy Lithium-Fluoride Batteries |
Jan 2009 |
37 pages |
| Authors:
William West; Mario Blanco; CALIFORNIA INST OF TECH PASADENA
|
| New anion receptors have been designed, modeled, synthesized, and tested at the battery cell level for use in dual ion intercalating batteries. In particular, a promising new class of cyclic fluorophenyl boronic acid anhydride (fluorophenyl boroxine) anion receptors was identified. The binding energetics of these compounds to fluoride can be readily varied by tailoring the degree of fluorination on the phenyl moieties or by substituting alternative fluorinated moieties. To the ... |
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| Verification of Periodically Controlled Hybrid Systems: Application to An Autonomous Vehicle |
Jan 2009 |
40 pages |
| Authors:
Tichakorn Wongpiromsarn; Sayan Mitra; Richard M Murray; Andrew Lamperski; CALIFORNIA INST OF TECH PASADENA
|
| This paper introduces Periodically Controlled Hybrid Automata (PCHA) for modular specification of hybrid control systems. In a PCHA, control actions that change the control input to the plant occur roughly periodically, while other actions that update the state of the controller may occur in the interim, changing the set-point of the system. Such actions could model, for example, sensor updates and information received from higher-level planning modules that change the ... |
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| Aerosol-Cloud-Radiation Interactions in Atmospheric Forecast Models |
30 Sep 2008 |
8 pages |
| Authors:
John H Seinfeld; CALIFORNIA INST OF TECH PASADENA
|
| The long-term goal of this project is to gain a deep understanding of the role of atmospheric aerosols in affecting transmission of radiation through the atmosphere and in influencing cloud properties. |
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| Stellar and Circumstellar Properties of the Pre-Main-Sequence Binary GV Tau From Infrared Spectroscopy |
20 Sep 2008 |
16 pages |
| Authors:
Greg W Doppmann; Joan R Najita; John S Carr; CALIFORNIA INST OF TECH PASADENA
|
| We report spatially resolved spectroscopy of both components of the low-mass pre-main-sequence binary GV Tau. High-resolution spectroscopy in the K and L bands is used to characterize the stellar properties of the binary and to explore the nature of the circumstellar environment. We find that the southern component, GV Tau S, is a radial velocity variable, possibly as a result of an unseen low-mass companion. The strong warm gaseous HCN ... |
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| Advanced Waveform Simulation for Seismic Monitoring |
Sep 2008 |
12 pages |
| Authors:
Donald V Helmberger; Arthur J Rodgers; Sidao Ni; Shengji Wei; Jeroen Tromp; CALIFORNIA INST OF TECH PASADENA
|
| Earthquake source parameters underpin several aspects of nuclear explosion monitoring. Such aspects are: calibration of moment magnitudes (including coda magnitudes) and magnitude and distance amplitude corrections (MDAC); source depths; discrimination by isotropic moment tensor components; and waveform modeling for structure (including waveform tomography). This project seeks to improve methods for and broaden the applicability of estimating source parameters from broadband waveforms using the Cut-and-Paste (CAP) methodology. The CAP method uses ... |
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| Environmental Fate and Exposure Assessment for Arsenic in Groundwater |
Aug-2008 |
28 pages |
| Authors:
Janet G Hering; David Burris; H J Reisinger; Peggy O'Day; CALIFORNIA INST OF TECH PASADENA
|
| The fate and transport of arsenic were examined at two Department of Defense (DoD) sites. At Tyndall Air Force Base, Florida arsenic contamination is the result of application of arsenical herbicides. At the Devens Reserve Forces Training Area (Ft. Devens), Massachusetts, naturally-occurring arsenic has been mobilized by application of enhanced reductive dechlorination (ERD) technology, designed to remediate contamination by chlorinated solvents. These two sites were compared with respect to plume ... |
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| High Resolution Imaging Testbed Utilizing Sodium Laser Guide Star Adaptive Optics: The Real Time Wavefront Reconstructor Computer |
31 Jul 2008 |
6 pages |
| Authors:
Richard G Dekany; Antonin H Bouchez; CALIFORNIA INST OF TECH PASADENA
|
| We have procured and assembled a real-time wavefront reconstructor computer for the PALM-3000 high-order upgrade to the Palomar adaptive optics system. This innovative computer uses a network of 17 graphics processing units to invert the measurements of a 64 x 64 wavefront sensor and reconstruct the wavefront at 3368 locations across the Hale Telescope pupil, at up to 2 kHz frame rate. A cluster of 10 desktop personal computers house ... |
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| Aerosol-Cloud-Radiation Interactions in Atmospheric Forecast Models |
30 SEP 2007 |
8 pages |
| Authors:
John H. Seinfeld; CALIFORNIA INST OF TECH PASADENA
|
| The long-term goal of this project is to gain a deep understanding of the role of atmospheric aerosols in affecting transmission of radiation through the atmosphere and in influencing cloud properties. |
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| Modeling Plastic Shocks in Periodic Laminates with Gradient Plasticity Theories |
26 AUG 2007 |
53 pages |
| Authors:
G. Ravichandran; A. Molinari; CALIFORNIA INST OF TECH PASADENA
|
| Steady plastic shocks generated by planar impact on metal-polymer laminate composites, are analyzed in the framework of gradient plasticity theories. The laminate material has a periodic structure with unit cell composed of two layers of different materials. First and second order gradient plasticity theories are used to model the structure of steady plastic shocks. In both theories, the effect of the internal structure is accounted for at the microscopic level ... |
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| Optical Logic With Gain: Photonic Crystal Nanocavity Switches |
31 Jul 2007 |
15 pages |
| Authors:
Axel Scherer; CALIFORNIA INST OF TECH PASADENA
|
| In this final report, we will describe the experimental results and new design concepts that we have developed over the past 3 years. We compare several approaches that take advantage of the addition of gain to optical logic system, and describe methods for electronic control over that gain. Moreover, we show several strategies of introducing optical gain into complex all optical logic systems and explore the ultimate operational speed of ... |
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| Semiconductor Based Transverse Bragg Resonance (TBR) Optical Amplifiers and Lasers |
14 FEB 2007 |
12 pages |
| Authors:
Amnon Yariv; CALIFORNIA INST OF TECH PASADENA
|
| We have fabricated electrically pumped, semiconductor TBR lasers in the InP/InGaAsP material system to demonstrate the efficiency gains possible by the incorporation of a transverse Bragg grating. By incorporating a transverse Bragg grating into a large-area laser, the optical modes of the laser can be designed to improve the efficiency compared to traditional index-guided lasers. The resulting transverse Bragg resonance (TBR) waveguide can be designed to have a single lateral ... |
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| Intelligent Therapeutics and Metabolic Programming Through Tailormade, Ligand-Controlled RNA Switches |
05 FEB 2007 |
7 pages |
| Authors:
Christina D. Smolke; CALIFORNIA INST OF TECH PASADENA
|
| Cells employ sensor biomolecules to dynamically evaluate their environments and trigger appropriate metabolic responses. The ability to program cells with engineered molecules that sense structural and chemical events and translate these events to controlled cellular behavior is a critical technology for challenges present in medical research and biotechnology. Recent studies have demonstrated the prevalence and diversity of nucleic acids that function as sensors and regulators of gene expression. Recent efforts ... |
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| Enlightened Multiscale Simulation of Biochemical Networks. Core Theory, Validating Experiments, and Implementation in Open Software |
OCT 2006 |
77 pages |
| Authors:
John C. Doyle; Michael Hucka; CALIFORNIA INST OF TECH PASADENA
|
| The objective of the research is to develop mathematical and software infrastructure in support of post-genomics research in systems biology. One objective articulated in this effort centers on a deeper understanding of the organizational principles of biological networks. A distinguishing theme of this work is its focus on scalable methods of robustness and model validation and invalidation with data, as opposed to relying purely on simulation. The Systems Biology Markup ... |
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| A Parabolic Load Balancing Method |
2006 |
26 pages |
| Authors:
Alan Heirich; Stephen Taylor; CALIFORNIA INST OF TECH PASADENA
|
| This paper presents a diffusive load balancing method for scalable multicomputers. In contrast to other schemes which are provably correct the method scales to large numbers of processors with no increase in run time. In contrast to other schemes which are scalable the method is provably correct and the paper analyzes the rate of convergence. To control aggregate cpu idle time it can be useful to balance the load to ... |
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| Large Scale Self-Organizing Information Distribution System |
31 DEC 2005 |
11 pages |
| Authors:
Steven Low; CALIFORNIA INST OF TECH PASADENA
|
| This project investigates issues in "large-scale" networks. Here "large-scale" refers to networks with large number of high capacity nodes and transmission links, and shared by a large number of users. It is almost impossible to simulate such networks and we aim to develop mathematical tools to uncover their structure, illuminate issues, and design solutions. In the three year project period, we have developed a mathematical theory to understand large scale ... |
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| From Fly Models to Flight Control |
DEC 2005 |
9 pages |
| Authors:
Michael H. Dickinson; CALIFORNIA INST OF TECH PASADENA
|
| In the research covered in this project, we integrated findings from biology to create a bottom-up model of the visual, mechanical, and aerodynamics systems the fruit fly to investigate the above general questions. Couched in the language of control systems, the model allows us to make detailed predictions about fly behavior under a given set of assumptions. Thus, we can simultaneously investigate, on the one hand, the actual strategies employed ... |
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| Semiconductor Based Transverse Bragg Resonance (TBR) Optical Amplifiers and Laser |
NOV 2005 |
9 pages |
| Authors:
Amnon Yariv; CALIFORNIA INST OF TECH PASADENA
|
| We have fabricated electrically pumped, semiconductor TBR lasers in the InP/InGaAsP material system to demonstrate the efficiency gains possible by the incorporation of a transverse Bragg grating. By incorporating a transverse Bragg grating into large-area laser, the optical modes of the laser can be designed to improve the efficiency compared to traditional index-guided lasers. The resulting transverse Bragg resonance (TBR) waveguide can be designed to have a single lateral mode ... |
|
| Plasmonic Devices and Materials |
30 JUN 2005 |
10 pages |
| Authors:
Harry A. Atwater; CALIFORNIA INST OF TECH PASADENA
|
| This final technical report reviews our scientific and technical development in the area of new plasmonic devices and material undertaken during our AFOSR support from July 2002-June 2005. This report contains a summary overview of scientific and technical progress and results over the entire program. It also provides detail about recent technical conducted during Period of the present grant. Our work since the inception of the program has focused on ... |
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| Detonation and Pulse Detonation Engines 1999-2005 (CD-ROM) |
23 May 2005 |
|
| Authors:
CALIFORNIA INST OF TECH PASADENA
|
 | ELECTRONIC FILE CHARACTERISTICS: 69 files; Adobe Acrobat (.PDF) and HTML. PHYSICAL DESCRIPTION: 1 CD-ROM; 4 3/4 in.; 168 MB. ABSTRACT: Research carried out from 2003-2005 at the Explosion Dynamics Laboratories at Caltech under an ONR contract has examined many issues critical to Pulse Detonation Engine (PDE) development. These include: detonation structure imaging using OH PLIF; a narrow channel facility for examining regular and irregular detonations; detonation diffraction; mechanism of soot ... |
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| Caltech Center for Structural and Amorphous Metals |
10 MAY 2005 |
114 pages |
| Authors:
William L. Johnson; R. D. Conner; CALIFORNIA INST OF TECH PASADENA
|
| The report summarizes the results of the university Structural Amorphous Metals Program sponsored by ARO/DARPA. It discusses laboratory and theoretical developments in discovery and understanding of Bulk Metallic Glasses, and experiments conducted to characterize the resulting alloys. |
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| Detonation Initiation by Annular Jets and Shock Waves |
05 MAY 2005 |
21 pages |
| Authors:
Joseph E. Shepherd; CALIFORNIA INST OF TECH PASADENA
|
| This project was an experimental test of the concept of initiating detonations in PDEs with imploding shock waves. The existing 6-inch shock tube at Caltech was used to create hot, high pressure air behind a reflected shock wave. The hot air created an imploding annular shock wave when it jetted through an annular orifice into a 76 mm diameter, 1 m long tube attached to the end of the shock ... |
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| Direct and Indirect Mechanisms of Microbial Iron Reduction |
30 APR 2005 |
4 pages |
| Authors:
Dianne K. Newman; CALIFORNIA INST OF TECH PASADENA
|
| We found that the direct and indirect pathways for Fe reduction by Shewanella oneidensis have significant overlap. We showed that outer membrane proteins that were previously thought to contact Fe "directly" also play a key role in reducing electron shuttling molecules like AQDS. Thus, a challenge for future research will be to demonstrate how electron transfer between these proteins and minerals works in detail. In addition, we defined the region ... |
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| Computational Electromagnetics |
APR 2005 |
5 pages |
| Authors:
Oscar Bruno; CALIFORNIA INST OF TECH PASADENA
|
| Significant progress has been attained in this area: we have developed an algorithm for automatic ansatz generation, and have demonstrated our overall algorithm by obtaining solutions involving tens of ansatz. An addition of Pade approximation has lead to results of machine precision in short computational times. In the last year's work, in particular, multiple scattering algorithms were developed which can compute high-order high frequency solution in 0 (1) operations for ... |
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| Solid Acid Based Fuel Cells |
28 JAN 2005 |
18 pages |
| Authors:
Sossina M. Haile; CALIFORNIA INST OF TECH PASADENA
|
| High power density fuel cells based on solid acid electrolytes have been demonstrated. In particular, a fuel cell with a 25 micron thick CsH2PO4 membrane was fabricated and yielded a power density of 425 mW/cm2 at 26O C (H2/ O2) without pressurization. In this configuration, the thin-film fuel cell is supported on a porous stainless steel gas diffusion layer and the electrocatalyst and electrolyte layers are spray-deposited. In parallel with ... |
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| Monolithic Waveguide Geometry for Voltage Controlled Switching and Routing of Optical Beams Based on Waveguide-Resonator Coupling |
24 JAN 2005 |
6 pages |
| Authors:
Amnon Yariv; Axel Scherer; William Green; CALIFORNIA INST OF TECH PASADENA
|
| Precise control of coupling between waveguides and resonant cavities enables the realization of several novel and improved devices, including low- power modulators, switches, filters, and wavelength routers. The goal of this program is to theoretically and experimentally evaluate and develop schemes for efficient, controlled coupling in optical polymer and semiconductor devices. Chip-based devices should be inexpensive, producible, and have the potential to be miniaturized and integrated with electronics. Technological progress ... |
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| Ligand Field Strengths of Carbon Monoxide and Cyanide in Octahedral Coordination |
10 JAN 2005 |
6 pages |
| Authors:
Patrick Hummel; Jonas Oxgaard; III Goddard William A.; Harry B. Gray; CALIFORNIA INST OF TECH PASADENA
|
| Ligand field splittings were extracted from absorption spectra of metal hexacarbonyl and hexacyano complexes over 35 years ago by Gray and coworkers (J. Am. Chem. Soc., 85, 2922 (1963); ibid. 90, 4260, 5713 (1968)). Recent time-dependent density functional theory calculations by Baerends and coworkers (J. Am. Chem. Soc., 121, 10356 (1999)) on M(CO)6 with M=Cr, Mo, W raised questions about the magnitudes of these ligand field splittings. In order to ... |
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| Multiscale Geometric Analysis: Theory, Applications, and Opportunities |
07 JAN 2005 |
97 pages |
| Authors:
Emmanuel Candes; CALIFORNIA INST OF TECH PASADENA
|
| Briefing charts only on classical multiscale geometric analysis: theory, applications and opportunities. |
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| Measurements and Modeling of Combustion Dynamics for Control of Combustion Instabilities |
10 DEC 2004 |
56 pages |
| Authors:
Fred Culick; Albert Ratner; Dal M. Kang; Konstantin I. Matveev; Winston Pun; CALIFORNIA INST OF TECH PASADENA
|
| This report is the final report of a six-month program with a six- month NCE comprising experimental work on problems arising with unsteady combustion of gases intended for use in propulsion systems. The experimental work comprises measurements providing the basis for inferring the local response function of a reacting mixture and is based on great extended equipment purchased before this program began, with a DURIP grant from AFOSR. The basic ... |
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| A Kalman Filter Clock Algorithm for Use in the Presence of Flicker Frequency Modulation Noise |
SEP 2004 |
17 pages |
| Authors:
John A. Davis; C. A. Greenhall; P. W. Stacey; CALIFORNIA INST OF TECH PASADENA
|
| NPL has developed a Kalman-filter-based clock algorithm for combining measurements from its three active hydrogen masers. The algorithm is designed to produce a near optimal composite when the dominant noise process present is flicker frequency modulation (FFM). The FFM is modelled approximately by a linear combination of Markov noise processes. Each Markov process is included in the Kalman filter and contributes an additional component to its state vector. Both the ... |
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| Understanding Olfaction: From Detection to Classification |
31 MAY 2004 |
60 pages |
| Authors:
James M. Bower; Linda Buck; William Goddard III; Denise Wilson; Nathan S. Lewis; CALIFORNIA INST OF TECH PASADENA
|
| The overall objective of this research project is to support a multidisciplinary approach to understanding the function of the mammalian olfactory system across many different levels of scale. The members of the MURI collaboration represent disciplines ranging from computational chemistry, to molecular and cellular biology, to systems and computational neuroscience. Working together the objective is to shed light on structure/function relationships from the level of single olfactory receptor molecules to ... |
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| Monolithic Integration of Microfluidics and Optoelectronics for Biological Analysis |
15 APR 2004 |
3 pages |
| Authors:
Axel Scherer; Stephen Quake; CALIFORNIA INST OF TECH PASADENA
|
| We have integrated microfluidic structures with optoelectronic lasers in the same device. Very sensitive and ultra-small laser sensors could be connected to fluidic systems by using microfluidic multiplexing technology and replication molded microfluidic chips. The basis of our sensor is a two- dimensional photonic crystal laser with an unusual cavity geometry that permits the introduction of analyte into the highest optical field region. This photonic crystal laser sensor can measure ... |
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| A Next Generation Scalable Finite Element Software to Describe Fracture and Fragmentation of Solids and Structures |
29 MAR 2004 |
11 pages |
| Authors:
J. Knap; A. Mota; M. Ortiz; CALIFORNIA INST OF TECH PASADENA
|
| Summary of accomplishments: The overarching goal of the originally proposed work was the development of a new generation scalable Lagrangian finite element software framework capable of capturing local and non-local fracture processes in solids and structures. The principal objectives of the work, as stated in the proposal, were: 1. Development a scalable Lagrangian software framework to simulate fracture and fragmentation due to weapon-target interactions. 2. Implementation of complex phenomenological as ... |
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| Femtosecond Dynamics of Chemical Reactions |
29 MAR 2004 |
14 pages |
| Authors:
Ahmed H. Zewail; CALIFORNIA INST OF TECH PASADENA
|
| We proposed to use this grant to undertake research in the following three major areas: (a) Dynamics of elementary steps in complex systems. (b) Dynamics of reactions under extreme environment (density, temperature, clustering, etc.). (c) New techniques for direct imaging of structural changes and chemical control of reactions yield and channel. In these studies, the basic approach is based on the development of ultrafast laser (and electron) and molecular beam ... |
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| Combustion Instabilities In Solid Propellant Rocket Motors |
JAN 2004 |
179 pages |
| Authors:
F. E. Culick; CALIFORNIA INST OF TECH PASADENA
|
| These notes for two lectures are intended to provide the basic ideas for understanding and interpreting coherent oscillations is solid propellant rocket motors. The discussion is concerned mainly with the dynamics of a system consisting of two coupled sub-systems: the chamber containing combustion products; and the combustion processes con ned almost entirely to a thin region adjacent to the surface of burning propellant. Coupling between the sub-systems is always present ... |
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| Workshop on Quantum Control Theory and its Applications |
2004 |
|
| Authors:
Richard Murray; CALIFORNIA INST OF TECH PASADENA
|
| This grant supported a workshop, held at Caltech in August 2004, that brought together experts in quantum mechanics, control theory, and dynamical systems for an exchange of ideas on the analysis, control, and design of quantum systems. One of the major goals of the workshop was to establish substantive technical interactions between physicists working on quantum 'applications' and control and dynamical systems researchers who have insights and tools but lack ... |
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| Quasi-Optical Power Combining |
24 DEC 2003 |
18 pages |
| Authors:
David Rutledge; CALIFORNIA INST OF TECH PASADENA
|
| We have developed the basic science underlying active quasi-optics. We have investigated power handling, noise, stability, efficiency and reliability, and developed the CAD tools necessary for industrial applications. In addition, we have demonstrated a single-chip output power of 5 W in the millimeter-wave frequency range, and developed practical waveguide packaging techniques for the devices. In the lower microwave frequency range we have developed a coaxial fin-line combiner that gives an ... |
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Reports by Corporate Author
