| Microstructural Design & Optimization of Highly Filled Epoxy Based Composites |
Nov-2009 |
|
| Authors:
Bradley White; Jennifer L Jordan; D W Richards; Jonathan E Spowart; Naresh N Thadhani; AIR FORCE RESEARCH LAB EGLIN AFB FL MUNITIONS DIRECTORATE
|
 | The dynamic mechanical properties of multi-constituent particulate composites, consisting of individual Ni and Al particles dispersed in an epoxy matrix are investigated in this study. Properties of such composites depend on the mechanical and physical properties of the individual components; their loading density; the shape and size of the particles; the interfacial adhesion; residual stresses; and matrix porosity. These multi-phase particulate composites systems, particularly those with high fill densities, have ... |
|
| Characterization of the Nonlinear Viscoelastic and Adhesive Properties of Polyurea and Characterization of Polyurea-Clad Metallic Structures |
14-Oct-2009 |
121 pages |
| Authors:
K Ravi-Chandar; K M Liechti; TEXAS UNIV AT AUSTIN CENTER FOR MECHANICS OF SOLIDS STRUCTURES AND MATERIALS
|
 | This report describes an experimental effort to characterize the viscoelastic properties of polyurea and the failure of ductile materials at high strain rates. The viscoelastic properties of cast polyurea were determined under monotonic loading conditions, both in the confined compression and Arcan shear configurations. The nonlinear viscoelastic properties have been determined and validated by predicting the large deformation compression behavior. Expanding ring experiments were performed on Al 6061-O, Al 1100-H14 ... |
|
| The Global Financial Crisis: Analysis and Policy Implications |
02-Oct-2009 |
|
| Authors:
Dick K Nanto; LIBRARY OF CONGRESS WASHINGTON DC CONGRESSIONAL RESEARCH SERVICE
|
| The world is near the bottom of a global recession that is causing widespread business contraction, increases in unemployment, and shrinking government revenues. Although recent data indicate the large industrialized economies may have reached bottom and are beginning to recover, for the most part, unemployment is still rising. Numerous small banks and households still face huge problems in restoring their balance sheets, and unemployment has combined with sub-prime loans to ... |
|
| Liquid Crystal Based Optical Phased Array for Steering Lasers |
Oct-2009 |
192 pages |
| Authors:
Lei Shi; Philip Bos; KENT STATE UNIV OH
|
| Beam steering technologies are attracting more and more research interests and attention because of the benefits of fast tuning, light weight, and synergy with adaptive optics. The liquid crystal OPA technology has been considered for small angle beam steering because of the small pitch, low driving voltages, large birefringence, flexibility, and electrical control. However, the large area resets of the phase profile caused by the fringe fields degrade the achievable ... |
|
| Viral Penetration of High Efficiency Particulate Air (HEPA) Filters (PREPRINT) |
Sep-2009 |
39 pages |
| Authors:
Joseph D Wander; Brian K Helmbuch; C Y Wu; APPLIED RESEARCH ASSOCIATES INC TYNDALL AFB FL
|
| High Efficiency Particulate Air (HEPA) filters are the primary technology used for particulate removal in individual and collective protection applications. HEPA filters are commonly thought to be impenetrable, but in fact they are only 99.97% efficient at collecting the most-penetrating particle (approx. 0.3 micrometer). While this is an impressive collection efficiency, HEPA filters may not provide adequate protection for all threats: viruses are submicron in size and have small minimum ... |
|
| Study of Composite Interface Strength and Crack Growth Monitoring Using Carbon Nanotubes |
Sep-2009 |
92 pages |
| Authors:
Mollie A Bily; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Interface strength of woven fabric composite layers was studied using Mode II fracture strength testing. Both carbon fiber and glass fiber composites were used with the vinyl ester resin. First, the single-step cured (i.e., co-cured) composite interface strength was compared to that of the two-step cured interface as used in the scarf joint technique. The test results showed that the two-step cured interface was as strong as the co-cured interface, ... |
|
| Transport Imaging: Developing an Optical Technique to Characterize Bulk Semiconductor Materials for Next Generation Radiation Detectors |
Jun-2009 |
79 pages |
| Authors:
Sarah L Catalano; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Characterization of the mobility-lifetime product is critical to the development of new materials for semiconductor radiation detectors. An optical technique has been developed that allows for the direct determination of the minority carrier diffusion length, drift length, and mobility-lifetime product from a single image of the recombination luminescence in semiconductor materials. Excess carriers are generated using the electron beam in a scanning electron microscope. The charge is then drifted by ... |
|
| Maritime Domain Awareness: Assessment of Current Status |
Jun-2009 |
49 pages |
| Authors:
Jared Freeman; Susan G Hutchins; Shelley P Gallup; Douglas J MacKinnon; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Maritime Domain Awareness (MDA) is viewed as predominately a security issue, however the economic ramifications of an attack against a high-value target such as a container vessel, cruise ship, or petro-chemical facility elevate the problem from a national level to cause for global concern. A significant attack could cause the port to shut down and spread anxiety through the global marketplace. To mitigate the danger posed by maritime vessels, the ... |
|
| High Reynolds Number Turbulence |
07-May-2009 |
10 pages |
| Authors:
Alexander J Smits; PRINCETON UNIV NJ DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
|
| The objectives of the grant are to provide a systematic study to fill the gap between existing research on low Reynolds number turbulent flows to the kinds of turbulent flows encountered on full-scale vehicles. We are specifically interested in (1) the behavior of wakes at high Reynolds numbers with increasing complexity, varying from axisymmetric wakes, to wakes typical of submarine shapes that include the effects of a sail, fins, and ... |
|
| The Use of Commercial Non-Hazardous Air Pollutant Monomers to Optimize the Properties of Fatty Acid-Based Resins |
May-2009 |
34 pages |
| Authors:
James M Sands; La; John J Scala; Priya Kamath; Anita Sahu; Giuseppe R Palmese; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Vinyl ester (VE) resins are used to make polymer matrix composites in military and commercial applications because of their good properties, low weight, and low cost. These resins typically contain high concentrations of reactive diluents, such as styrene, to allow these resins to be molded using resin transfer molding and other inexpensive liquid molding techniques. Because styrene is a hazardous air pollutant (HAP) and a volatile organic compound (VOC), the ... |
|
| Violent Crime: A Comparative Study of Honduras and Nicaragua |
Mar-2009 |
107 pages |
| Authors:
David A Wilson; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis explains variation between contemporary Honduras and Nicaragua in terms of their levels of violent crime. The thesis is driven by an empirical observation: Nicaragua, a country that shares a border with Honduras and where the U.S.-backed Contras waged a civil war against the Sandinista government during much of the 1980s, is considerably less violent than Honduras, which did not undergo civil war. This variation conflicts with expectations in ... |
|
| Interfacing the TCM8230MD CMOS Camera with an ARM7 Microcontroller |
Mar-2009 |
20 pages |
| Authors:
Justin L Shumaker; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD VEHICLE TECHNOLOGY DIRECTORATE
|
| The TCM8230MD is a color complementary metal-oxide semiconductor video camera manufactured by Toshiba. Image resolutions range from 128x96 to 640x480 pixels, with frame rates as high as 30 Hz. Due to high data rates, a powerful microcontroller with an efficient buffering algorithm is required. Because of its small size, mass, power consumption, and cost, this camera has tremendous application to micro-robotic systems. Microcontrollers such as the ARM9 have dedicated hardware ... |
|
| NbTiSiMo-X Alloys-Composition, Microstructure Refinement and Properties (Preprint) |
Mar-2009 |
15 pages |
| Authors:
C Woodward; Y-W Kim; S Menon; UES INC DAYTON OH
|
| Advanced NbTiSi-X alloys have demonstrated very high RT strength levels (compressive yield strength approaching 1,800 MPa) and excellent high-temperature strength retention (approx. 1,200 MPa at 1,000 degrees C and over 500 MPa at 1,200 degrees C). Unfortunately, these alloys have an inhomogeneous size and spatial distribution of silicides, low fracture strength under tension (300 MPa) at all temperatures, and low oxidation resistance. The high volume fraction and non-uniform size distribution ... |
|
| Evaluation of Saft Ultra High Power Lithium Ion Cells (VL5U) |
Feb-2009 |
24 pages |
| Authors:
Sonya Gargies; Jeff Read; Wishvender Behl; Wesley Tipton; Thomas Salem; Donald Porschet; Jan L Allen; Jeff Wolfenstine; Kang Xu; T R Jow; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| We evaluated Saft Ultra High Power (UHP) cells (Saft designation VL5U) to determine their rate capability, low temperature performance, storage, and cycle life. The energy and power density at 5 A (1C) were 45 Wh/kg and 55 W/kg, respectively; at 1000 A (200C) were 25 Wh/kg and 10 kW/kg, respectively; and at a 500 A rate, the energy densities were 35, 29, and 29 Wh/kg at 20, -20, and -40 ... |
|
| Wavelength Tuning Limitations in Optically Pumped Type-II Antimonide Lasers |
07-Jan-2009 |
6 pages |
| Authors:
A P Ongstad; R Kaspi; G C Dente; M L Tilton; J R Chavez; R Barresi; AIR FORCE RESEARCH LAB KIRTLAND AFB NM
|
| In this paper, we examine the wavelength tuning limitations of type-II antimonide lasers containing InAs/InGaSb/InAs quantum wells. Wavelength tuning is accomplished by varying the thickness of the InAs electron wells while keeping all else fixed. In principle, these wells can be tuned from lambda approximately equal 2.5 m out to far IR wavelengths by increasing the thickness of the InAs layers. However, a practical upper limit of lambda approximately equal ... |
|
| Accurate Methods for Large Molecular Systems (Postprint) |
06-Jan-2009 |
19 pages |
| Authors:
Jerry A Boatz; Mark S Gordon; Jonathan M Mullin; Spencer R Pruitt; Luke B Roskop; Lyudmila V Slipchenko; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| Three exciting new methods that address the accurate prediction of processes and properties of large molecular systems are discussed. The systematic fragmentation method (SFM) and the fragment molecular orbital (FMO) method both decompose a large molecular system (e.g., protein, liquid, zeolite) into small subunits (fragments) in very different ways that are both designed to retain the high accuracy of the chosen quantum mechanical level of theory while greatly reducing the ... |
|
| High Yield Magnetic Nanoparticles Filled Multiwalled Carbon Nanotubes Using Pulsed Laser Deposition |
Dec-2008 |
5 pages |
| Authors:
Dereje Seifu; Shashi P Karna; MORGAN STATE UNIV BALTIMORE MD DEPT OF PHYSICS
|
| We present a high yield filling technique of multi-walled carbon nanotubes (MWCNTs), grown vertically on a SiO2 substrate, with magnetic nanoparticles using pulsed laser deposition (PLD). Magnetization measurements in-plane and out-of-plane with respect to the sample surface indicate reasonable coercivity estimated at 0.4 T. The magnetic anisotropy is however found to be randomly oriented, indicating a polycrystalline structure. The unique difference between the in-plane and out-of-plane magnetizations is the sharing ... |
|
| PSMA-Targeted Nano-Conjugates as Dual-Modality (MRI/PET) Imaging Probes for the Non-Invasive Detection of Prostate Cancer |
Oct-2008 |
10 pages |
| Authors:
Xiankai Sun; TEXAS UNIV AT DALLAS SOUTHWESTERN MEDICAL CENTER
|
| The goal of this project is to develop dual modality imaging probes for the detection of prostate cancer by doping radioisotopes to iron oxide nanoparticles, so that the sensitivity and specificity of prostate cancer diagnosis could be significantly improved. In the three years, a facile approach has been developed to prepare gamma- or positron emitting nuclides incorporated SPIO nanoparticles (NUSPIONs) for dual modality imaging of prostate cancer, where a size-exclusion ... |
|
| Mechanical Response of an Al-PTFE Composite to Uniaxial Compression Over a Range of Strain Rates and Temperatures |
01-Sep-2008 |
28 pages |
| Authors:
Daniel T Casem; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| Compressive stress-strain curves were generated for a pressed and sintered mixture of polytetrafluoroethylene and aluminum powders. Experiments were performed at strain rates ranging from 0.001 to 8000/s using a servo-hydraulic load frame and a split Hopkinson pressure bar. High-rate experiments were also performed over a temperature range of 22-78 C. The data is fit to the Johnson-Cook and Modified Johnson-Cook constitutive equations and also to a Zerilli-Armstrong equation adapted for ... |
|
| Modulation of PPAR-Gamma Signaling in Prostatic Carcinogenesis |
Sep-2008 |
10 pages |
| Authors:
Simon W Hayward; VANDERBILT UNIV MEDICAL CENTER NASHVILLE TN
|
| The long term objective of this work is to elucidate metabolic pathways which can be used to reduce the need for radical surgery in patients at high risk for prostate cancer or with early stage disease. The hypothesis to be tested is that alterations to lipoxygenase (LOX) and cyclooxygenase (COX) activity in early prostate cancer represent distinct druggable pathways which can be treated in conjunction with the PPAR-gamma signaling pathway ... |
|
| Analysis of Eye Movements in Change Detection with Teams Using a Simulated Tactical Situation Display |
Sep-2008 |
93 pages |
| Authors:
Camilla C Knott; William T Nelson; Megan K McCroskey; Brent T Miller; NATIONAL RESEARCH COUNCIL WASHINGTON DC
|
| Change blindness results from the absence of attention from the source of a change. Unsurprisingly, change blindness worsens in dual task and high workload conditions. Such is the environment in which teams of operators in military command and control missions operate, yet little is known about change blindness susceptibility in these conditions. A flicker task required individuals and dyads to detect changes under high and low task difficulty. Reaction time, ... |
|
| High Yield Magnetic Nanoparticles Filled Multiwalled Carbon Nanotubes Using Pulsed Laser Deposition |
Aug-2008 |
3 pages |
| Authors:
Dereje Seifu; Shashi P Karna; MORGAN STATE UNIV BALTIMORE MD DEPT OF PHYSICS
|
| We present a high yield filling technique of multiwalled carbon nanotubes (MWNTs), grown vertically on a SiO2 substrate, with magnetic nanoparticles using pulsed laser deposition (PLD). Magnetization measurements in-plane and out-of- plane with respect to the sample surface indicate reasonable coercivity estimated at 0.4 T. The magnetic anisotropy is however found to be randomly oriented, indicating a polycrystalline structure. The unique difference between the in-plane and out-of-plane magnetizations is the ... |
|
| China's Economic Conditions |
27-Jun-2008 |
|
| Authors:
Wayne M Morrison; LIBRARY OF CONGRESS WASHINGTON DC CONGRESSIONAL RESEARCH SERVICE
|
| Since the initiation of economic reforms in 1979, China has become one of the world's fastest-growing economies. From 1979 to 2007 China s real gross domestic product (GDP) grew at an average annual rate of 9.8%. Real GDP grew 11.4% in 2007 (the fastest annual growth since 1994). While China is expected to continue to enjoy rapid economic growth in the years ahead and could become the world s largest ... |
|
| Earthquakes: Risk, Monitoring, Notification, and Research |
19-Jun-2008 |
|
| Authors:
Peter Folger; LIBRARY OF CONGRESS WASHINGTON DC CONGRESSIONAL RESEARCH SERVICE
|
| Close to 75 million people in 39 states face some risk from earthquakes. Seismic hazards are greatest in the western United States, particularly California, Alaska, Washington, Oregon, and Hawaii. The Rocky Mountain region, a portion of the central United States known as the New Madrid Seismic Zone, and portions of the eastern seaboard, particularly South Carolina, also have a relatively high earthquake hazard. Compared to the loss of life in ... |
|
| Annexin II-Dependent Mechanism of Breast Cancer Progression |
01-Jun-2008 |
9 pages |
| Authors:
Mahesh C Sharma; DREXEL UNIV PHILADELPHIA PA
|
| Angiogenesis and metastasis are two processes that are central to the progression of cancer. As such, they have become important targets for the development of anti-cancer agents. Invasive and metastatic cancers of the breast are distinguished by their propensity of newly formed blood vessels (neoangiogenesis). Neoangiogenesis is a significant independent prognostic indicator in early stage breast cancer (1). Delineating the molecular mechanism(s) of neoangiogenesis may provide new insights into the ... |
|
| System Analysis and Design of a Low-Cost Micromechanical Seeker System |
JUN 2008 |
|
| Authors:
Brian J. Nagle; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
| Precision guided targeting systems have been in use by the U.S. military for the last half-century. The desire for high targeting accuracies while maintaining minimal collateral damage has driven the implementation of guidance systems on a myriad of different platforms. Current seeker systems using global positioning system (GPS)-aided technology offer good accuracy, but are limited by an adversary's signal jamming capabilities and the dynamic nature of the military target environment. ... |
|
| China's Holdings of U.S. Securities: Implications for the U.S. Economy |
19-May-2008 |
|
| Authors:
Marc Labonte; Wayne M Morrison; LIBRARY OF CONGRESS WASHINGTON DC CONGRESSIONAL RESEARCH SERVICE
|
| Given its relatively low savings rate, the U.S. economy depends heavily on foreign capital inflows from countries with high savings rates (such as China) to help promote growth and to find the federal budget deficit. China has intervened heavily in currency markets to limit the yuan's appreciation. As a result, China has become the world's largest and fastest growing holder of foreign exchange reserves (FER), which totaled $ 1.5 trillion ... |
|
| A Model System to Investigate the Effect of BRCA1 and/or p53 Inactivation in the Ovarian Stroma on Growth and Transformation Potential of the Ovarian Epithelium |
01-May-2008 |
11 pages |
| Authors:
Denise Connolly; FOX CHASE CANCER CENTER PHILADELPHIA PA
|
| The tumor microenvironment plays an important role in cancer progression. The tumor stroma promotes angiogenesis and is a source of growth factors, chemokincs, and extracellular matrix (ECM) molecules that promotes carcinoma progression. We are investigating the effects of loss of function of BRCAl and Trp53 in the stroma on the growth and neoplastic transformation of epithelial cells using 2-D and 3-D in vitro culture models. Wamcn carrying gerrnline mutations in ... |
|
| Near Source Energy Partitioning for Regional Waves in 2D and 3D Models |
30-Apr-2008 |
62 pages |
| Authors:
Ru-Shan Wu; Xiao-Bi Xie; Thome Lay; CALIFORNIA UNIV SANTA CRUZ
|
| The complex excitation and energy partitioning mechanisms yielding regional phases are difficult to empirically separate by data analysis. Thus, numerical modeling approaches are valuable for investigating excitation and propagation of regional seismic phases. We use accurate full-wave simulations (2D and 3D finite-difference method, and 2D boundary element method) to calculate seismic wave excitation and propagation in near-source region. An embedded array slowness analysis is used for quantifying how energy will ... |
|
| Plastic Optoelectronics: Injection Lasers Fabricated from Soluble Semiconducting Polymers and Bulk Heterojunction Solar Cells Fabricated from Soluble Semiconducting Polymers |
17 APR 2008 |
15 pages |
| Authors:
Alan J. Heeger; Guillermo Bazan; CALIFORNIA UNIV REGENTS SANTA BARBARA
|
| We summarize progress on bulk heterojunction (BHJ) "plastic" solar cells: BHJ solar cells are based on phase-separated blends of polymer semiconductors and fullerene derivatives. Because of self-assembly on the nanometer length scale, excitons formed after absorption of solar irradiation diffuse to a heterojunction prior to recombination and are dissociated at the polymer/fullerene interface. Ultrafast charge transfer from semicondueting polymers to fullerenes guarantees that the quantum efficiency for charge transfer (CT) ... |
|
| UCLA High Speed, High Volume Laboratory Network for Infectious Diseases |
APR 2008 |
102 pages |
| Authors:
Scott P. Layne; CALIFORNIA UNIV LOS ANGELES
|
| Background. Government agencies and expert panels have recognized the need for laboratories capable of analyzing tens of thousands of biological samples per day that have hundreds of times more capability than at present. Objectives/Hypothesis. This project aims to develop a new high speed high volume (high-throughput) laboratory capability that will be linked in a network and operated by several premier institutions. The automated networked capability will make us stronger against ... |
|
| Femtosecond Diffraction and Spectroscopy of Chemical Reactions |
31 MAR 2008 |
8 pages |
| Authors:
Ahmed H. Zewail; CALIFORNIA INST OF TECH PASADENA DEPT OF CHEMICAL ENGINEERING
|
| In the past five years, we have proposed to use this grant to undertake research in the following areas: 1) Direct imaging of structural changes using ultrafast electron diffraction. 2) Neutral and ionic elementary reactions: high energy and solvation effects. Our goal was to relate these dynamics to features of bonding and mechanisms and to explore the influence of high energy and solvation of reactivity. Theoretical studies in our group ... |
|
| Defense Acquisitions: Significant Challenges Ahead in Developing and Demonstrating Future Combat System's Network and Software |
MAR 2008 |
44 pages |
| Authors:
GOVERNMENT ACCOUNTABILITY OFFICE WASHINGTON DC
|
| It is not yet clear if or when the Army and LSI can develop, build, and demonstrate the information network that is at the heart of the FCS concept. The Army is faced with significant management and technological challenges that place development of FCS's network and software at risk. Almost 5 years into the program, the Army and LSI have not yet fully defined how the FCS network is expected ... |
|
| Ultrafast Spectroscopy of Mid-Infrared Semiconductors Using the Signal and Idler Beams of a Synchronous Optical Parametric Oscillator |
MAR 2008 |
54 pages |
| Authors:
Richard M. Derbis; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT/DEPT OF ENGINEERING PHYSICS
|
| The objective of this thesis was to improve the procedure for taking ultrafast, time-resolved measurements of photoluminescence from MWIR semiconductors. Previous work has used a mode-locked titanium sapphire (Ti:Saph)laser to excite the semiconductor sample and to upconvert the photoluminescence from the semiconductor. Work completed in this thesis improved on the techniques developed during previous work. |
|
| Autonomous Underwater Vehicle Navigation |
01-Feb-2008 |
36 pages |
| Authors:
P A Miller; J Farrell; Y Zhao; V Djapic; SPACE AND NAVAL WARFARE SYSTEMS CENTER SAN DIEGO CA
|
| This report considers the vehicle navigation problem for an autonomous underwater vehicle with six degrees of freedom. We approach this problem using an error state formulation of the Kalman filter. Integration of the vehicle's high-rate inertial measurement unit's accelerometers and gyros allow time propagation while other sensors provide measurement corrections. The low-rate aiding sensors include a Doppler velocity log, an acoustic long baseline system that provides round-trip travel times from ... |
|
| Report of the Defense Science Board Task Force on DoD Energy Strategy, "More Fight - Less Fuel" |
FEB 2008 |
136 pages |
| Authors:
DEFENSE SCIENCE BOARD WASHINGTON DC
|
| On May 2, 2006 the Under Secretary of Defense for Acquisition, Technology and Logistics (USD(AT&L)) directed the Defense Science Board to create a Task Force to examine DoD Energy Strategy Citing significant risks to both our nation and our military forces, he challenged the Task Force to find opportunities to reduce DoD's energy demand, identify institutional obstacles to their implementation, and assess their potential commercial and security benefits to the ... |
|
| A Joined-Wing Flight Experiment |
FEB 2008 |
213 pages |
| Authors:
Maxwell Blair; Jason Robinson; William A. McClelland; Jason C. Bowman; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AIR VEHICLES DIRECTORATE
|
| This report summarizes several design and analysis studies surrounding the flight test of a 7% geometric scale of a notional high-altitude, long-endurance (HALE) variant that targeted the AFRL SensorCraft mission. Established procedures were modified to accommodate low-cost testing with giant-scale radio-controlled technology as an approach to reduce high risk associated with new technologies, such as the joined-wing concept. The flight test vehicle reported here was rigid. The second successful flight ... |
|
| Experimental Study of the Mini-Helicon Thruster |
Feb-2008 |
81 pages |
| Authors:
Jean-Luc Cambier; Oleg Batishchev; MASSACHUSETTS INST OF TECH CAMBRIDGE SPACE PROPULSION LAB
|
| An experimental program to develop and test a mini-helicon thruster is described. The helicon discharge was designed and built in several different configurations using low- and high-current electromagnets. The program was designed to address several objectives: (i) to achieve a high coupling of RF-power to plasma and efficient acceleration to 20km/sec; (ii) to evaluate the scaling relations between power density, flow rates and B-field strength; (iii) to demonstrate operation with ... |
|
| High Speed Imaging Chopper Polarimetry |
Jan-2008 |
38 pages |
| Authors:
Roy M Matchko; Grant R Gerhart; BATTELLE SCIENTIFIC SERVICES PROGRAM PAYSON AZ
|
| The Stokes method provides a seminal method for the determination of a state of polarization of a beam of light using measurable quantities. This paper presents a methodology for the rapid acquisition of the four Stokes parameters. We have been able to acquire images at the rate of 500 images per second using a high speed video camera. Using the high speed video camera, an optical chopper, a computer system ... |
|
| PSA-Based Screening Outcomes, Dietary Heterocyclic Amine Exposure, and Prostate Cancer Risk in African Americans |
JAN 2008 |
29 pages |
| Authors:
Kenneth T. Bogen; CALIFORNIA UNIV LIVERMORE
|
| Prostate cancer (PC) is the second leading cause of male U.S. cancer deaths, with African-Americans having the highest rate of PC mortality worldwide, as well as more abnormal results from screening tests that correlate with current or eventual PC. A 5-year prospective NIH-funded clinic-based study investigated whether prostate-specific antigen (PSA) and digital rectal exam (DRE) screening indicators of PC risk in 500 African-American men 50 to 70 years of age ... |
|
| Identification of Prostate Cancer Related Genes Using Inhibition of NMD in Prostate Cancer Cell Lines. Addendum |
JAN 2008 |
5 pages |
| Authors:
Yurij Ionov; ROSWELL PARK CANCER INST BUFFALO NY
|
| A strategy to identify mutant genes using inhibition of nonsense mediated decay (NMD) in cell lines has been proposed by others. Blocking translation with antibiotic emetine has been shown to inhibit the NMD. Stabilization of mutant mRNA following the inhibition of NMD with emetine can be detected using microarray technology, such as Affymetrix genechips, for example. Unfortunately, too many genes that do not contain any mutations show mRNA increase following ... |
|
| Assessing Plankton and Particles with an Autonomous Imaging LOPC |
Jan-2008 |
6 pages |
| Authors:
Checkley; David M Jr; Alex W Herman; SCRIPPS INST OF OCEANOGRAPHY LA JOLLA CA INTEGRATIVE OCEANOGRAPHY DIV
|
| We wish to characterize and quantify particles and plankton in the pelagic ocean, to enable an understanding of their dynamics and their roles in ecosystems and biogeochemical cycles. Characterization and quantification are also necessary to describe the distribution and abundance of particles and plankton in the sea in relation to the environment, including its acoustic and optical properties. Our objective is to integrate the Laser Optical Plankton Counter (LOPC) with ... |
|
| Use of a Recombinant Fluorescent Substrate with Cleavage Sites for All Botulinum Neurotoxins in High-Throughput Screening of Natural Product Extracts for Inhibitors of Serotypes A, B, and E7 |
14 DEC 2007 |
8 pages |
| Authors:
Harry B. Hines; Alexander D. Kim; Robert G. Stafford; Shirin S. Badie; Ernst E. Brueggemann; David J. Newman; James J. Schmidt; ARMY MEDICAL RESEARCH INST OF INFECTIOUS DISEASES FORT DETRICK MD
|
| The seven serotypes of botulinum neurotoxin (BoNTs) are zinc metalloproteases that cleave and inactivate proteins critical for neurotransmission. Synaptosomal protein of 25 kDA (SNAP-25) is cleaved by BoNTs A, C, and E, while vesicle-associated membrane protein (VAMP) is the substrate for BoNTs B, D. F. and G. BoNTs are not only medically useful drugs, but are also potential bioterrorist and biowarfare threat agents. Because BoNT protease activity is required for ... |
|
| Bright Phase-Stable Broadband Fiber-Based Source of Polarization-Entangled Photon Pairs |
24-Oct-2007 |
5 pages |
| Authors:
M D Eisaman; J Fan; A Migdall; NATIONAL INST OF STANDARDS AND TECHNOLOGY GAITHERSBURG MD
|
| We describe an achromatic, phase-stable, broadband source of polarization-entangled photon pairs with high spectral brightness that uses four-wave mixing in a fiber Sagnac interferometer. We achieved a polarization entangled two-photon coincidence rate of 7 kHz per 0.5 THz (0.9 nm) of bandwidth per 300 microW of average pump power. At this rate, we observed two-photon fringe interference visibilities greater than 97%, over a l0 THz (21 nm) spectral range. We ... |
|
| High Throughput Screen to Identify Novel Drugs that Inhibit Prostate Cancer Metastasis |
OCT 2007 |
33 pages |
| Authors:
Irwin H. Gelman; ROSWELL PARK CANCER INST BUFFALO NY
|
| We have proposed to developed indicator cell lines that would allow for the high throughput screening (HTS) for compounds that potentially inhibit prostate cancer (CaP) metastasis. The cell lines are based on stably expressing a construct containing the promoter of SSeCKS/ gravin/AKAP12- a metastasis-suppressor gene downregulated in CaP progression- linked to a green fluorescence protein (GFP), plus a control reporter, in metastatic CaP cells, and then screening for compounds that ... |
|
| Molten Carbonate Fuel Cell Operation With Dual Fuel Flexibility |
OCT 2007 |
36 pages |
| Authors:
JOSEPH DALY; George Steinfeld; David K. Moyer; Franklin H. Holcomb; ENGINEER RESEARCH AND DEVELOPMENT CENTER CHAMPAIGN IL CONSTRUCTION ENGINEERING RESEARCH LAB
|
| The ability to operate highly-efiicient, pollution-free, distributed-generation power plants on either natural gas or HD-5 grade propane is of interest to the U.S. Army and the U.S. Department of Homeland Security as secure power for critical power operations. To address this interest, Concurrent Technologies Corporation (CTC) teamed with FuelCell Energy (FCE) to test an internally reforming 250 kW carbonate direct fuel cell using HD-5 propane. This fuel cell power plant, ... |
|
| Using a Near-Bed Sediment Flux Sensor to Measure Wave Formed Bedform Migrations and Formation Processes |
OCT 2007 |
|
| Authors:
Peter A. Traykovski; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
|
| My research program focuses on identifying and quantifying sediment erosion, transport, and deposition processes on the continental shelf through state of the art observational techniques in both fine grained and sandy environments. In sandy environments, my goal is to understand the detailed interactions and feedbacks between hydrodynamics, bedforms, and the resulting sand transport. In fine-grained environments, I have been investigating the role fluid mud flows as a depositional mechanism in ... |
|
| Multimodal Guidance for Land Navigation |
OCT 2007 |
67 pages |
| Authors:
Linda R. Elliott; Maaike Duistermaat; Elizabeth S. Redden; Jan van Erp; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD HUMAN RESEARCH AND ENGINEERING DIRECTORATE
|
| This report describes the third in a series of collaborative experiments between the U.S. Army Research Laboratory and TNO Human Factors (Soesterberg, The Netherlands). In each experiment, a personal tactile navigation (PTN) system for land navigation was compared with alternate land navigation systems in wooded terrain at Fort Benning, Georgia, during high workload conditions that included secondary tasks such as radio communications, target detection, and determination of location coordinates. This ... |
|
| Experimental Investigation of the Interaction of Electrothermal Plasmas with Solid Propellants |
14 SEP 2007 |
35 pages |
| Authors:
Philip L. Varghese; Noel T. Clemens; Michael D. Ryan; TEXAS UNIV AT AUSTIN APPLIED RESEARCH LABS
|
| We report measurements of the interaction between plasma radiation and solid propellant. We made heat flux measurements of the electrothermal plasma jet impinging on a sensor mimicking a disk of propellant. We made planar laser-induced fluorescence images of NO, a JA2 decomposition product at the propellant surface. High speed video imaging of the propellant surface and scattering of ejected particles was used to study how the propellant surface evolves during ... |
|
| Defense Business Transformation: Achieving Success Requires a Chief Management Officer to Provide Focus and Sustained Leadership |
SEP 2007 |
41 pages |
| Authors:
GOVERNMENT ACCOUNTABILITY OFFICE WASHINGTON DC
|
| Although DOD has made progress toward establishing a management framework for overall business transformation, the framework currently focuses on business systems modernization and does not fully address broader business transformation efforts. In 2005, DOD set up the Defense Business Systems Management Committee to review and approve the business enterprise architecture a transformation blueprint and new business systems modernization investments. It also established the Business Transformation Agency, which currently reports to ... |
|
Reports by Keyword(s)
HIGH RATE
