| Coarsening Kinetics of gamma-prime Precipitates in the Commercial Nickel Base Superalloy Rene88DT (PREPRINT) |
Sep-2008 |
28 pages |
| Authors:
J Tiley; R Banerjee; R Srinivasan; G B Viswanathan; H L Fraser; D M Dimiduk; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
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 | Rene88DT samples were subjected to different cooling rates after a supersolvus treatment, and aged for varying periods of time from 25 to 200 hours at 760 degrees C. Secondary and tertiary gamma-prime precipitate sizes were measured after each heat treatment condition through scanning electron microscopy (SEM) and energy filtered transmission electron microscopy (EFTEM). Coarsening rate constants were calculated and reported from the measured values of precipitate sizes. When describing the ... |
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| DoD Metal Finishing Workshop: Chromate Alternatives for Metal Treatment and Sealing |
17 MAY 2007 |
48 pages |
| Authors:
Keith O. Legg; DEPUTY DIRECTOR OF DEFENSE RESEARCH AND ENGINEERING ARLINGTON VA STRATEGIC ENVIRONMENTAL RESEARCH AND DEVELOPMENT PROGRAM
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| This technical workshop was designed to bring together DoD and industry engineers to identify specific DoD needs, commercial solutions, and engineering data for replacing chromate processes used for overhaul and new weapons systems in vehicles, aircraft and vessels: DoD needs for chromates and their alternatives; Commercial and military experience with alternatives; Specific COTS treatments to meet DoD requirements; Data and specifications for making engineering decisions; Data gaps are and how ... |
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| Development of Ceramics with Highly Organized Microstructures |
MAR 2007 |
32 pages |
| Authors:
Gary Messing; Susan Trolier-McKinstry; PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MATERIALS SCIENCE AND ENGINEERING
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| Enhanced spatial control of microstructure development during sintering allows for access to finely engineered properties in ceramics. Predominately single phase ceramics with highly organized microstructures have been fabricated in two different systems: Al(2)O(3) and BaTiO(3). In the Al(2)O(3) system, samples were processed with a focus on spatial control of microstructure development. Distinct regions of different grain sizes, degree of texture, and single crystal were fabricated in situ within single samples. ... |
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| Transport Properties of N-Methyloated Nylon-6: Chitosan Blend Membranes |
SEP 2006 |
22 pages |
| Authors:
Eugene Napadensky; Yossef A. Elabd; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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| A series of N-Methylolated Nylon-6 chitosan blend membranes was evaluated for their potential use as breathable (high water transport) barriers (low chemical agent transport) for military and civilian protective clothing apparel. Nylon-6 was methylolated and subsequently blended with chitosan at different compositions and processing conditions (room temperature, 100 C, and 200 C). Vapor transport rates of water (breathability) and dimethyl methylphosphonate (protection) (a simulant of the nerve agent Sarin) were ... |
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| A Cursory Examination of a Parachute Bag Knife, P/N 71172 |
SEP 2006 |
24 pages |
| Authors:
Marc Pepi; Victor Champagne; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| A parachute bag knife was received for a quick-look analysis to determine the reason for edge deformation after normal use. The U.S. Army Research Laboratory performed hardness testing, chemical analysis, and metallography. Hardness testing in conjunction with metallography showed a layer of decarburization around the periphery of the knife (not on the blade edge, however). Chemical analysis verified alloy AISI 4130 was used. Metallography also revealed a less than optimal ... |
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| Nanoscale Polymeric Photocells by Advanced Electrospinning |
20 JUL 2006 |
51 pages |
| Authors:
Anvar Zakhidov; John Ferraris; Kenneth Balkus; TEXAS UNIV AT DALLAS RICHARDSON
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| We presented detailed study of postproduction neat treatment of organic solar cells based on RR-P3HT:PCBM composite in a wide temperature range. The efficiency of such device was significantly Improved by postproduction heat treatment. Optimized parameters yielded >3% efficiency for devices on glass substrates and of |
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| Decontamination of Test Range Metal Debris using a Transportable Flashing Furnace |
01 MAY 2006 |
33 pages |
| Authors:
W. Hayes; Ralph Clayson; P.E. Lasson; EL DORADO ENGINEERING INC SALT LAKE CITY UT
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| The largest quantities of debris collected during the clearance of military test and open burning/open detonation (OB/OD) ranges are not live munitions but parts and pieces of munitions that may or may not have trace quantities of explosive contamination. The collected debris varies in size from very small to very large fragments and consists primarily of steel, with some brass and aluminum, and a small portion of other materials. In ... |
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| Giant Magnetoresistance Behavior of an Iron/Carbonized Polyurethane Nanocomposite |
01-Apr-2006 |
12 pages |
| Authors:
H T Hahn; Zhanhu Guo; Sung Park; Suying Wei; Monica Moldovan; Amar B Karki; David P Young; CALIFORNIA UNIV LOS ANGELES DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
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| This letter describes the magnetoresistance (MR) behavior of the heat-treated polyurethane composites reinforced with iron nanoparticles. The flexible nanocomposites were fabricated by the surface-initiated-polymerization method. The uniformly distributed nanoparticles within the polymer matrix, well characterized by field emission scanning electron microscopy, favor a continuous carbon matrix formation, rendering the transition from insulating to conductive composites. The coercive forces reflect strong particle loading and matrix dependent magnetic properties. By simply annealing ... |
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| Dynamic Consolidation of TaC and Nano-YSZ Powders (PREPRINT) |
07 FEB 2006 |
10 pages |
| Authors:
Lei Xu; Darrell Marchant; Lawrence Matson; B. S. Majumdar; NEW MEXICO INST OF MINING AND TECHNOLOGY SOCORRO DEPT OF METALLURGICAL AND MATERIALS ENGINEERING
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| The high melting point of TaC (3880 deg C), second amongst all known materials, along with good corrosion resistance makes TaC a potential candidate for Air Force applications. However, traditional methods of manufacturing, such as hot pressing or HIP-ing, give rise to rapid grain growth and low fracture toughness. In this work, we have utilized dynamic consolidation technique to overcome the grain growth problem, and thereby obtain stronger and more ... |
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| Microstructural Mitigation of Hydrogen Environment Embrittlement of Ultra-High Strength AerMet(Trademark) 100 |
2006 |
33 pages |
| Authors:
Yongwon Lee; Richard P. Gangloff; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF MATERIALS SCIENCE AND ENGINEERING
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| AerMet(exp TradeMark) 100, a secondary precipitation hardened martensitic steel, has excellent strength ((Sigmays = 1725 MPa) and toughness (K(sub IC) = 130 MP square root of am) when optimally tempered at 482C. However, it is susceptible to severe hydrogen environment assisted cracking (HEAC) in near-neutral 3.5% NaCl at very low threshold stress intensities (K(sub TH)) and with rapid Stage II plateau rates for subcritical crack propagation (da/dt(sub II). Interaction between ... |
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| Synthesis and Mirostructural Design of Oxide Fibers |
31 DEC 2005 |
7 pages |
| Authors:
Wonki Yoon; Waltraud M. Kriven; ILLINOIS UNIV AT URBANA DEPT OF MATERIALS SCIENCE AND ENGINEERING
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| Fine ceramic oxide fibers are widely used as reinforcements in composites for high temperature applications. The primary goal of this research effort was to investigate the growth of single crystal or textured or eutectic oxide fibers by heat treatment of polycrystalline or amorphous precursor fibers. |
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| A Comparison of the Deformation, Flow, and Failure of Two Tungsten Heavy Alloys in Ballistic Impacts |
DEC 2005 |
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| Authors:
Brian Schuster; Lee Magness; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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 | Ballistic tests were conducted with subscale long rod penetrators of two different processing conditions of the same tungsten heavy alloy. The liquid-phase sintered composite of 90% tungsten-9% nickel-01% cobalt (by weight) was tested in its low-strength, as -sintered and heat-treated condition, and in a high-strength, 50% cold-worked (by swaging) and aged condition. Consistent differences in the ballistic performance of the two lots of penetrators were observed, in depth of penetrations ... |
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| Development of Advanced Oxide Dispersion Strengthened Tungsten Heavy Alloy for Penetrator Application |
30 SEP 2005 |
47 pages |
| Authors:
Soon H. Hong; Ho J. Ryu; Seung I. Cha; Hee Y. Kim; Kyung T. Kim; Kyong H. Lee; Chan B. Mo; KOREA ADVANCED INST OF SCIENCE AND TECHNOLOGY DAEJEON (KOREA)
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| The effects of fabrication process parameters, including conditions for powder preparation, sintering, cyclic heat-treatment, swaging, and annealing processes, on microstructures and static/dynamic mechanical properties of ODS tungsten heavy alloys were investigated. The composition of ODS tungsten heavy alloys was designed as 94W-4.56Ni-1.14Co-0.3Y2O3 which show the highest strength at similar microstructural parameters based on the analysis of microstructures and mechanical properties. The two-stage sintered ODS tungsten heavy alloy showed finer tungsten ... |
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| Magneto-Mechanical Response in Ni-Mn-Ga Magnetic Shape Memory Alloys |
24 AUG 2005 |
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| Authors:
Leon M. Cheng; Rosaura Ham-Su; Shannon P. Farrell; Calvin V. Hyatt; DEFENCE RESEARCH AND DEVELOPMENT ATLANTIC DARTMOUTH (CANADA)
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| It is generally accepted that the large reversible, magnetic-field-induced strain observed in ferromagnetic shape memory alloys is due to the rearrangement of twin variants in the martensite by an applied magnetic field leading to an overall change of shape. The main thermodynamic driving force for twin boundary motion in the presence of a magnetic field is the high magnetocrystalline anisotropy of the low-symmetry martensitic phase. Low twin boundary energy, high ... |
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| Formation of Titania Submicron-Scale Rod Arrays on Titanium Substrate and In Vitro Biocompatibility |
13 JUL 2005 |
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| Authors:
Satoshi Hayakawa; Yongxing Liu; Kazuya Okamoto; Kanji Tsuru; Akiyoshi Osaka; OKAYAMA UNIV (JAPAN)
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| Titania submicron-scale rod arrays were fabricated on metallic titanium (alpha-Ti) surfaces by coating a layer of sodium tetraborate on titanium substrates and subsequent thermal treatment. Thin-film X-ray diffraction analysis indicated that the sodium tetraborate gave rutile (TiO2:PDF# 21-1276) submicron-scale rod arrays. The rods in the arrays are parallel to each other in the grain of metallic titanium surface. The titania submicron-scale rod arrays deposited apatite within 7 days after being ... |
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| Deformation Microstructure in Beta-Titanium After Deformation at Low Temperatures |
JUN 2005 |
45 pages |
| Authors:
F. J. Humphreys; P. S. Bate; I. Brough; MANCHESTER UNIV (UNITED KINGDOM) MATERIALS SCIENCE CENTER
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| This report results from a contract tasking University of Manchester (UMIST) as follows: The contractor shall investigate cell boundary misorientations, alignments, and stored energies in a beta titanium alloy subjected to cold work. The contractor shall use a beta Ti alloy that is stable and single-phase at room temperature. The contractor shall evaluate the microstructure of the material after deformation at room temperature and at temperatures up to ~400C. Both ... |
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| Investigation of Semiconductor Nitride Deposition & Characterization on Defect-Void GaN Templates & ZnO Substrates |
11 MAR 2005 |
14 pages |
| Authors:
Hadis Morkoc; VIRGINIA COMMONWEALTH UNIV RICHMOND SCHOOL OF ENGINEERING
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| A variety of approaches have been taken to enhance GaN quality during epitaxy and lead zirconate titanate (PZT) structures for sensors and data storage. GaN regrown on KOH etched templates with defective material removed has shown improved optical quality and demonstrated lateral growth by MBE. The same also carried out using MOCVD. GaN layers were also grown on closely lattice and stacking matched ZnO substrates. In this vein, we developed ... |
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| Development of Silicone Substrates to be Used with CIGS Deposition |
01 FEB 2005 |
62 pages |
| Authors:
Herschel Reese; DOW CORNING CORP MIDLAND MI
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| During this third and last reporting period of this contract, it was shown that our front runner candidate substrate, that of glass fabric reinforced 106-resin, sustained the high temperature fabrication conditions of CIGS devices and allowed ITN Energy Systems to build initial PV cell prototypes. Although these prototype cells were very crude, with very low efficiency (< 1-2%), low uniformity and numerous cracks and defects, it was also evidence of ... |
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| Numerical Simulation of Hydrogen Assisted Cracking in Supermartensitic Stainless Steel Welds |
27 JAN 2005 |
223 pages |
| Authors:
Ekkarut Viyanit; UNIVERSITAET DER BUNDESWEHR HAMBURG (GERMANY) FACHBEREICH MASCHINENBAU
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| Replacement of expensive duplex stainless steel and conventional carbon steel by a new generation of supermartensitic stainless steel has been taken into account since the last decade in order to meet the technical-economical challenge for transportation flowlines of unprocessed oil and gas products in offshore technology. Supermartensitic stainless steels can provide appropriate material properties, such as: improved strength-to-weight ratio, enhanced useful corrosion resistance, as well as application at relatively low ... |
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| Gradient-Index (GRIN) Lenses by Slurry-Based Three-Dimensional Printing (S-3DP) |
16 NOV 2004 |
|
| Authors:
Michael J. Cima; MASSACHUSETTS INST OF TECH CAMBRIDGE
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| The BaO-SiO2 material system, which has a 2.4 stronger index changing ability than the Al2O3-SiO2 material system, was developed. Barium acetate was used as the dopant source. The pre-sintering treatment was found to be 900 degrees C for 18 hours in air to convert barium acetate to barium oxide. The sintering condition was found to be 1725 degrees C for 10 minutes in vacuum. A barium oxide-doped GRIN lens with ... |
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| Coarsening Behavior of an Alpha-Beta Titanium Alloy |
NOV 2004 |
37 pages |
| Authors:
S. L. Semiatin; B. C. Kirby; G. A. Salishchev; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
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| The static-coarsening behavior of the alpha-beta titanium alloy, Ti- 6Al-4V, was established via a series of heat treatments at typical forging- preheat and final-heat-treatment temperatures followed by quantitative metallography. For this purpose, samples of an ultra-fine-grain-size (UFG) billet with a microstructure of equiaxed alpha in a beta matrix were heated at temperatures of 843,900,955, and 982 C for times between 0.25 and 144 h followed by water quenching. The coarsening ... |
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| Hybrid Metal/Electrolyte Monolithic Low Temperature SOFCs |
15 OCT 2004 |
140 pages |
| Authors:
Joe Cochran; Jim Lee; Meilin Liu; Dave McDowell; Tom Sanders; GEORGIA INST OF TECH ATLANTA OFFICE OFSPONSORED RESEARCH
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| The program objective is to develop SOFCs, operating in the 500-700 degrees C range, based on Metal/Electrolyte square cell honeycomb formed by simultaneous powder extrusion of electrolyte and metal interconnects on alternate layers. The alloy interconnect is being formed as an oxide powder mixture which will be reduced to the metal and then co-sintered with the electrolyte during hydrogen thermal treatment. Goals include power density of 5 KW/liter, alternative fuels, ... |
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| The Influence of Processing on the Microstructure and Properties of the Titanium Alloy Ti-5111 |
SEP 2004 |
20 pages |
| Authors:
Amy C. Stauffer; Ernest J. Czyryca; Donald A. Koss; NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD
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| The physical, mechanical, and corrosion properties of titanium and its alloys are attractive for applications in the U.S. Navy in view of design requirements for increased reliability with reduced maintenance and weight. The Naval Surface Warfare Center, in cooperation with Titanium Metals Corporation, developed the Ti-5Al-1Sn-1Zr-1V-0.8Mo (Ti-5111) alloy as a lower cost alternative to previous high-strength titanium alloys exclusive to Navy applications. The influence of heat treatment on the microstructure ... |
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| Erosion and Erosion-Corrosion Performance of Cast and Thermally Sprayed Nickel-Aluminium Bronze |
01 JUN 2004 |
25 pages |
| Authors:
R. C. Barik; J. A. Wharton; R. J. Wood; K. S. Tan; K. R. Stokes; SOUTHAMPTON UNIV (UNITED KINGDOM) SCHOOL OF ENGINEERING SCIENCES
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| Nickel-Aluminum Bronze (NAB) is widely used for propulsion and seawater handling systems in naval platforms. It is selected because of its attractive combination of toughness and shock resistance but it has inherent susceptibility to selective phase corrosion and erosion-corrosion. In order to extend the life of NAB components, modern coating techniques are being considered in order to confer improved wear and corrosion resistance, as well as a method of providing ... |
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| Complex-Shaped Microcomponents by the Reactive Conversion of Biological Templates |
27 MAY 2004 |
30 pages |
| Authors:
Kenneth H. Sandhage; Rajesh Naik; Morley Stone; GEORGIA INST OF TECH ATLANTA SCHOOL OFMATERIALS SCIENCE AND ENGINEERING
|
| This project has been aimed at: 1) identifying gas/solid reaction conditions for converting biologically-derived micro/nanotemplates into other oxides without a loss of the starting 3-D shape and fine features, and 2) evaluating the nanochemical/nanostructural evolution during such reactive conversion. The most significant accomplishments have been: 1) Development of an oxidation-reduction reaction process for converting biosilica-based micro/ nanoassemblies into MgO nanoparticle structures with a preservation of the starting 3-D shape and ... |
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| Investigation of Subcritical Fatigue Crack Growth in Gamma Titanium Aluminides |
26 MAY 2004 |
19 pages |
| Authors:
Blair London; CALIFORNIA POLYTECHNIC STATE UNIV SAN LUIS OBISPO COLLEGE OF ENGINEERING
|
| Our titanium aluminide alloy was readily heat treated to a fully lamellar state by holding at 1345C for 1.5 hours and furnace cooling resulting in a grain size of 330 muon m. The yield stress, ultimate stress, and total elongation were 315MPa, 465MPa, and 0.46% respectively. The fully lamellar microstructure shows significant work hardening. No long cracks initiated at R=0.1 and variation max=300MPa with up to 1.4 million cycles. |
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| Microstructure and Mechanical Properties of Al-AL4C3 Materials |
18 MAR 2004 |
8 pages |
| Authors:
Michal Besterci; L'udovit Parilak; SLOVAK ACADEMY OF SCIENCES KOSICE (CZECHOSLOVAKIA) INST OF MATERIALS RESEARCH
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| Dispersion strengthened aluminium compacts have been prepared by powder metallurgy. The base microstructure is aluminium matrix strengthened with dispersed ceramic particles. The strengthening is direct by dislocation movement retardation, and indirect by deformation induced microstructure modification in the next technological steps. The method of mechanical alloying process is described. Carbon transformation to carbide Al4C3 is characterised for different heat treatment schedules and nine commercial carbon powders tested. The micromechanism of ... |
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| High Strength Microstructural Forms in Titanium Alloys Processed with Rapid Heat Treatment |
18 MAR 2004 |
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| Authors:
Orest Ivasishin; AKADEMIYA NAUK URSR KIEV INST OF PHYSICS OF METALS
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| Viewgraphs of presentation on the high strength microstructural forms of titanium alloys processed with rapid heat treatment. |
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| In Situ Thermal Treatment of Chlorinated Solvents: Fundamentals and Field Applications |
01-Mar-2004 |
146 pages |
| Authors:
ENVIRONMENTAL PROTECTION AGENCY WASHINGTON DC OFFICE OF SOLID WASTE
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| This report contains information about the use of in situ thermal treatment technologies to treat chlorinated solvents in source zones containing free-phase contamination or high concentrations of contaminants that are either sorbed to soil or dissolved in groundwater in the saturated or unsaturated zone. Chlorinated solvent source zones have a high frequency of occurrence at hazardous waste sites. In situ thermal treatment technologies have proven to be effective in remediating ... |
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| Corrective Measures to Restore Corrosion Resistance Following Friction Stir Welding |
2004 |
21 pages |
| Authors:
ROCKWELL SCIENTIFIC CO THOUSAND OAKS CA
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| Friction stir welding (FSW) is a solid state joining process invented at TWI in 1991. This technology makes it possible to join aluminum alloys, which are difficult or impossible to weld by conventional techniques.(1-7) A schematic illustration of the FSW process is shown in Figure 1. To friction stir weld either a butt or lap joint, a specially designed cylindrical tool is rotated and plunged into the joint line. The ... |
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| Interfacial Layer Effects in Ba(1-x)Sr(x)TiO3 Thick Films Prepared by Plasma Spray |
19 NOV 2003 |
8 pages |
| Authors:
Kipyun Ahn; Bruce W. Wessels; Sanjay Sampath; NORTHWESTERN UNIV EVANSTON IL DEPT OF MATERIALS SCIENCE AND ENGINEERING
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| The dielectric properties of high k dielectric thick films prepared by thermal spray were investigated. BaTiO3 and Ba(0.68)Sr(0.32)TiO3 thick films were deposited using plasma spray on Ag-Pd screen-printed alumina substrates. The sprayed films were predominantly polycrystalline but contained an amorphous second phase. The dielectric constants of the films decreased with decreasing film thickness in 10 approx. 60 micrometer range. This was attributed to the presence of an interfacial layer between ... |
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| Cost And Performance Report; Application of Thermocouple Conversion to Destroy Demolition Debris from Fort Ord |
02 JUL 2003 |
35 pages |
| Authors:
NAVAL FACILITIES ENGINEERING SERVICE CENTER PORT HUENEME CA
|
| A series of thermal treatment tests were conducted on military wood waste contaminated with lead-based paint for the U.S. Army Engineer Research & Development Center Construction Engineering Research Laboratory (ERDC/CERL) champaign, Illinois under a contract with the Naval Facilities Engineering Service Center (NFESC) in Port Hueneme California. The tests were designed to collect data that would facilitate the design and capital/operational cost estimates for a transportable treatment system that could ... |
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| Controlled Crystallization of Amorphous Oxide Fibers |
20 JUN 2003 |
35 pages |
| Authors:
Waltraud M. Kriven; ILLINOIS UNIV AT URBANA DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| The goal of this work is to produce creep resistant reinforcement fibers to improve the toughness and reliability of oxide ceramic composites, which are able to withstand operating temperatures of 1600 deg. C in air. We have studied crystallization mechanisms of quenched mullite (3Al2O3 (dot) 2SiO2) and YAG (Y3Al5O12), from solid amorphous or polycrystalline spheres and determined the parameters of kinetics and thermodynamics. This has enabled us to put together ... |
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| Force on an Asymmetric Capacitor |
JUN 2003 |
37 pages |
| Authors:
Thomas B. Bahder; Christian Fazi; ARMY RESEARCH LAB ADELPHI MD
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| When a high voltage (approx. 30 kV) is applied to a capacitor whose electrodes have different physical dimensions, the capacitor experiences a net force toward the smaller electrode (Biefeld-Brown effect). We have verified this effect by building four capacitors of different shapes. The effect may have applications to vehicle propulsion and dielectric pumps. We review the history of this effect briefly through the history of patents by Thomas Townsend Brown. ... |
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| Post-Growth Thermal Treatment of Self-Assembled InAs/GaAs Quantum Dots |
21 MAY 2003 |
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| Authors:
Adam Babinski; J. Jasinski; GRENOBLE HIGH MAGNETIC FIELD LAB (FRANCE)
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| Results of a post-growth rapid thermal annealing (RTA) on Gallium Arsenide (GaAs) proximity-capped structures with high density (^10" cm(-2)) of self-assembled Indium Arsenide/Gallium Arsenide (InAs/GaAs) quantum dots (QDs) are presented. Features of the QDs, bi-dimensional platelets (2DP), and InAs wetting layer (WL) were identified in a photoluminescence (PL) spectrum of the as-grown sample. Transmission electron microscopy shows that RTA at temperatures up to 700 degrees Centigrade for 30 seconds results ... |
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| Neutron and Synchrotron Non-Destructive Methods for the Characterisation of Materials for Different Applications |
18 MAR 2003 |
56 pages |
| Authors:
Franco Rustichelli; ANCONA UNIV (ITALY)
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| Viewgraphs of presentation on neutron and synchrotron non-destructive methods for the characterization of materials for different applications. |
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| Sensitivity of Spores to Hydrostatic Pressure Mechanisms of Inactivation, Injury and Repair Phase II |
MAR 2003 |
41 pages |
| Authors:
Dallas G. Hoover; Adrienne E. H. Shearer; Anthony Sikes; C. P. Dunne; DELAWARE UNIV NEWARK DEPT OF ANIMAL AND FOOD SERVICE
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| Over the past fifteen years, it has been established that high- hydrostatic pressure processing (HPP) has significant potential to function as an effective nonthermal method in the destruction of microorganisms in foods with little effect on the sensory qualities of the food product. However, bacterial endospores are very pressure-resistant and have been shown to require a hurdle approach for inactivation when HPP is employed. This study investigated the inhibitory effect ... |
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| Molecular Imaging for IMRI-Guided Minimally Invasive Treatment of Prostate Cancer |
MAR 2003 |
214 pages |
| Authors:
Baowei Fei; David L. Wilson; Jeffrey L. Duerk; D. B. Sodee; CASE WESTERN RESERVE UNIV CLEVELAND OH
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| Our long-range objective is to develop an image-guided, minimally invasive thermal ablation treatment method for the prostate cancer. Before this method can he achieved, significant engineering developments are required. |
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| Synthesis and Behavior of Nanostructured Coatings Using Thermal Spraying |
22 JAN 2003 |
9 pages |
| Authors:
E. J. Lavernia; CALIFORNIA UNIV DAVIS
|
| Potential applications of thermal spraying coatings span the entire spectrum of technology, from thermal barrier coatings for turbine blades to wear resistant rotating parts. The goal of this research program was to synthesize and characterize nanostructured thermal spraying coatings. The specific objectives were as follows: (1) to synthesize nanostructured powders for fabrication of nanostructured thermal spraying coatings; (2) to improve the spray technology for spraying nanostructured powders; and (3) to ... |
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| Optimized Hyperthermia Treatment of Prostate Cancer Using a Novel Intracavitary Ultrasound Array |
JAN 2003 |
93 pages |
| Authors:
Nadine Smith; Lewis E. Harpster; Robert M. Keolian; Victor Sparrow; Andrew Webb; PENNSYLVANIA STATE UNIV UNIVERSITY PARK
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| The eventual goal this research is to produce an ultrasound hyperthermia array which will uniformally heat the prostate to clinical temperatures for the treatment of prostate disease. This goal can be achieved by accounting for the physical differences between the prostate gland and surrounding tissue structures. It is therefore possible to design transducer to cause uniform heating within the prostate while causing minimal damage to surrounding tissue. The first year ... |
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| A Study of Hydrogen Adsorption in Pretreated Nanocarbon |
2003 |
6 pages |
| Authors:
Sang M. Lee; Satoshi Ohshima; Kunio Uchida; Motoo Yumura; JAPAN FINE CERAMICS CENTER IBARAKI (JAPAN)
|
| A thermal treatment was applied with CO2 and air for the development of a porous structure. Adsorption isotherms of nitrogen were measured on well-characterized Ni-C nanoparticles. The thermal treatment with CO2 increased the total surface area and micropore volume. In addition the thermal treatment with CO2 increased the hydrogen adsorption. |
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| Investigating Strain Path Changes on Flow Stress and Microstructural Evolution in TiAl-4V Alloy During Hot Deformation |
26 SEP 2002 |
7 pages |
| Authors:
John Beynon; SHEFFIELD UNIV (UNITED KINGDOM)
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| Using the purpose built arbitrary strain path rig, hot deformation testing has been carried out on a commercial Ti-6A1-4V alloy. Initially, simple reverse torsion tests were performed, followed by tests combining torsion and uniaxial deformation. Optical and scanning electron microscopy have been used to assess the initial, heat treated and deformed structures. Bulk texture analysis has been carried out on the initial material, Electron Beam Backscattering Diffraction (EBSD) was used ... |
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| Microstructure Effects on Creep Behavior of Next Generation of Refractory Alloys for Very High Temperature Applications |
13 JUN 2002 |
29 pages |
| Authors:
Vijay K. Vasudevan; Keith J. Leonard; CINCINNATI UNIV OH DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| The primary objective of the present project was to gain a basic understanding of the effects of microstructure on the creep behavior of a new class of Mo-Si-B alloys that are being considered for very high temperature structural applications. A second objective was to obtain insight into the oxidation behavior of these materials. During this one-year project, thermal effects on microstructure evolution in a Mo-7.44Si-8.51B (at.%) alloy were studied. The ... |
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| Metals Processing/Processing Science. Work Order Directive (WUD) 49 |
MAY 2002 |
40 pages |
| Authors:
S. L. Semiatin; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
|
| A wide range of research related to the deformation, solidification, and vapor processing of materials of importance to the Air Force was conducted under this Work Unit Directive. The primary theme of all of the research was to establish the physics of materials behavior during processing and to exploit this knowledge to improve existing processes and develop new processes. The important results are discussed in the following sections on intermetallic ... |
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| Nanocomposites as Designed Catalysts for Direct Methanol Fuel Cells |
04 MAR 2002 |
9 pages |
| Authors:
Charles M. Lukehart; VANDERBILT UNIV NASHVILLE TN DIV OF SPONSORED RESEARCH
|
| The specific aim of this research project is the development of novel methods for preparing improved catalysts for direct methanol fuel cells (DMFCs) These catalysts consist of metal alloy nanoclusters dispersed onto a conductive carbon support Synthetic control of the alloy nanocluster composition is achieved by preparing molecular precursors in which the precursor contains two or more metals of a desired stoichiometry Adsorption of single-source molecular precursors onto Vulcan carbon ... |
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| Electroluminescence and Spectral Shift of CdS Nanoparticles on Si Wafer |
JAN 2002 |
6 pages |
| Authors:
Eih-Zhe Liang; Ching-Fuh Lin; Sheng-Ming Shih; Wei-Fang Su; NATIONAL TAIWAN UNIV TAIPEI
|
| Preparation of CdS nanoparticles, devices fabrication and electroluminescence properties at room temperature of CdS nanoparticles on silicon substrates are reported. A spectral shift of 8 meV of free exciton transition was observed that was due to the passivation of hydroxyl thiophenol molecules around nanoparticles. Controlled process conditions such as heat treatment and/or with oxygen-rich environment are experimented and found to have significant influences on emission spectra. Radiative recombination corresponding to ... |
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| Luminescence from Erbium Oxide Grown on Silicon |
JAN 2002 |
6 pages |
| Authors:
E. Nogales; B. Mendez; J. Piqueras; R. Plugaru; J. A. Garcia; UNIVERSIDAD COMPLUTENSE DE MADRID (SPAIN)
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| The luminescence properties of erbium oxide grown on crystalline and amorphous silicon substrates were studied by means of photo- and cathodoluminescence techniques. Differences in the luminescence spectra for samples grown on the two types of substrates used are explained in terms of the different types of erbium centers formed by taking into account the substrate properties and the thermal treatments during growth. For comparison, erbium implanted and oxygen comparison crystalline ... |
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| Fabrication of PMN-PT Single Crystals by Using the Exaggerated Grain Growth Method |
23 NOV 2001 |
72 pages |
| Authors:
Doh-Yeon Kim; N. M. Hwang; Ho-Yong Lee; D. Y. Yoon; S. J. Kang; SEOUL NATIONAL UNIV (REPUBLIC OF KOREA)
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| Polycrystalline 65 mole% Pb(Mg1/3Nb1/3)O3 -35 mole% PbTiO3 (PMN-PT) specimens were prepared by conventional and spark-plasma sintering. Conventional sintering at 1200 deg C produced 92% dense specimens, whereas spark-plasma sintering at 900 deg C produced 99% dense specimens. Addition of slight excesses of Mg accelerated grain growth, but additions of Nb retarded grain growth. In addition, excess Mg decreased dielectric and piezoelectric properties. Grain- growth studies indicated that abnormal grain growth ... |
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| Insight into the Formation of Ultrafine Nanostructures in Bulk Amorphous Zr(54.5)Ti(7.5)Al(10)Cu(20)Ni(8) |
NOV 2001 |
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| Authors:
Andre Heinemann; Helmut Hermann; Albrecht Wiedenmann; Norbert Mattern; Uta Kuhn; INSTITUT FUER FESTKOEPER UND WERKSTOFFORSCHUNG DRESDEN (GERMANY)
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| Bulk amorphous Zr(54.5)Ti(7.5)Al(10)Cu(20)Ni(8) is investigated by means of small-angel neutron scattering (SANS) diffractional-scanning calorimetry (DSC) high-resolution electron microscopy (HREM) and other methods. The formation of ultrafine nonstructures in the glassy phase is observed and explained by a new model. Structural fluctuations of randomly distributed partially ordered domains grow during annealing just below the glass transition temperature by local re-ordering. During annealing the DSC gives evidence for a increasing volume fraction ... |
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| Topology and Electronic Structure of Onion-Like Carbon and Graphite/Diamond Nanocomposites. |
NOV 2001 |
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| Authors:
Lyubov G. Bulusheva; Alexander V. Okotrub; Vladimir L. Kuznetsov; Andrew L. Chuvilin; SUSSEX UNIV BRIGHTON (UNITED KINGDOM)
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| Annealing of nanodiamond at moderate temperature makes it possible to produce structures being intermediate in the carbon transformation from sp(sup 3) - to sp(sup 2)-state (graphite/diamond nanocomposites) and onion-like carbon (OLC). Electron microscopy shows such structures involve cage shells with spacing close to graphite. X-ray emission spectroscopy has been applied to examine the electronic structure of OLC and graphite/diamond nanocomposites. The CK alpha-spectra of OLC produced in the temperature range ... |
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