| Fixed-Wing Air Support Planning Models for the Brigade Combat Team |
12-Jun-2009 |
98 pages |
| Authors:
Scott C Campbell; ARMY COMMAND AND GENERAL STAFF COLL FORT LEAVENWORTH KS
|
 | The Army's transformation to the brigade combat team (BCT) as its primary combat employment unit has come at the cost of reduced organic firepower and armor under the modular force concept. As a result, greater emphasis and dependence will likely be placed upon fixed-wing fires in support of the BCT. Simultaneously, Air Force aircraft continue to experience reduced mission capable (MC) rates due to sustained combat operations and airframe fatigue. ... |
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| Friction on Crack Surfaces During Compression of Explosives - A Source of Hot Spots and Probable Ignition Sites |
May-2009 |
21 pages |
| Authors:
Donald A Wiegand; Brett Redingius; Kevin Ellis; Claire Leppard; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ
|
| The mechanical properties of composite plastic bonded explosives were investigated as a function of confining pressure. The results indicate different failure processes in two pressure ranges, a low pressure range between about 0.1 to 7.0 MPa, which is considered in this paper and a higher pressure range. In the low pressure range, crack processes are important in failure. The pressure dependence of the compressive strength in the low pressure range ... |
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| Depth Derivation from the Worldview-2 Satellite Using Hyperspectral Imagery |
Mar-2009 |
69 pages |
| Authors:
Loomis; Michael J Jr; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The Worldview-2 satellite, scheduled for launch in 2009, will have a multispectral sensor with several additional spectral bands not available on current multispectral sensors. This research investigates the use of the additional yellow spectral band to derive bathymetry. A hyperspectral image acquired from the AVIRIS sensor was used as a substitute image for the Worldview-2 multispectral sensor. The image was processed using the Stumpf et al. (2003) ratio method to ... |
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| Equivalent Roughness Height for Plane Bed Under Oscillatory Flow |
Jan-2009 |
15 pages |
| Authors:
Magnus Larson; Benoit Camenen; Atilla Bayram; CEMAGREF LYON (FRANCE)
|
| A new relationship between the roughness height and the main hydrodynamic and sediment parameters for plane beds under oscillatory conditions is presented. In order to derive such a relationship, a large data base encompassing plane-bed experiments was compiled from previous investigations and analyzed. Different methods to estimate the roughness height were investigated. Comparisons between the data and different existing predictive formulas for the bed roughness obtained from the literature were ... |
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| GPS Changes Before and After Implementation of the Architecture Evolution Plan |
01-Dec-2008 |
21 pages |
| Authors:
M A Weiss; A Masarie; NATIONAL INST OF STANDARDS AND TECHNOLOGY BOULDER CO TIME AND FREQUENCY DIV
|
| We characterize the performance of GPS signals before, and after Architecture Evolution Plan (AEP) implementation. We use the period from 20 May through 13 September 2007, MJDs 54240-54356, as the period before AEP. We use the interval from 14 September 2007 through 31 December 2007, MJDs 54357- 5446 as the period after the implementation of AEP. We use a variance analysis to characterize performance, allowing us to characterize periodic behavior ... |
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| Development of a Novel Approach for Fatigue Life Prediction of Structural Materials |
Dec-2008 |
155 pages |
| Authors:
Yanyao Jiang; NEVADA UNIV RENO DEPT OF MECHANICAL ENGINEERING
|
| Experiments were conducted to study the fatigue initiation and crack growth of four structural materials: aluminum 7075T651 alloy, stainless steel AL6-XN, stainless steel 304L, and Aerospace Steel 4340. It was confirmed that fatigue can occur under compression-compression loading for the aluminum alloy. Results from multiaxial fatigue experiments revealed that the fatigue cracking behavior was material and loading amplitude dependent. Under cyclic pure shear loading, the S-N curves of aluminum alloy ... |
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| Testbed Implementation of Loop-Free Soft Handoff in Wireless Battlefield Networks |
Dec-2008 |
9 pages |
| Authors:
Ibrahim Hoekelek; Selcuk Cevher; Mariusz A Fecko; Provin Gurung; Sunil Samtani; Zhensbeng Zhang; Aristides Staikos; Jeffrey Bowcock; TELCORDIA TECHNOLOGIES INC PISCATAWAY NJ
|
| A fundamental challenge in wireless mobile battlefield networks (WMBNs) is frequent occurrence of wireless link congestion and failures due to blockage, mobility, interference, etc. In case of a link or node failure, the end-to-end session will be disrupted until the underlying routing protocol converges to its new path. We propose an innovative distributed architecture for a seamless multi-layer soft handoff protocol in WMBNs to provide the sub-second convergence in case ... |
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| Variability in Room Temperature Fatigue Life of Alpha+Beta Processed Ti-6Al-4V (Preprint) |
Oct-2008 |
17 pages |
| Authors:
Reji John; JOHN PORTER; Patrick J Golden; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
|
| In this program, smooth bar fatigue tests were conducted by several laboratories on the same lot of Ti-6Al-4V forged plate material. Multiple stress ratios and stress levels were tested to generate a fully populated stress-life curve. The tests, however, did not typically consist of many repeats. The approach of this work is to conduct a statistically significant number of repeated fatigue tests at a few loading conditions. A similar approach ... |
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| Predicting California Bearing Ratio from Trafficability Cone Index Values |
Oct-2008 |
121 pages |
| Authors:
Deborah Diemand; George Mason; Sally A Shoop; Wendy L Wieder; Peter M Seman; ENGINEER RESEARCH AND DEVELOPMENT CENTER HANOVER NH COLD REGIONS RESEARCH AND ENGINEERING LAB
|
| California bearing ratio (CBR) soil strength measurements are commonly used by the U.S. Air Force to identify locations suitable for use as expedient runways. Field CBR testing is a time-consuming operation requiring a skilled operator, and can be hazardous for the evaluation teams in hostile environments. Limited amounts of published CBR data are available. The measurement of trafficability cone index (CI), widely used by the U.S. Army for similar applications, ... |
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| Design, Build, and Test a Hand-held GPS Interference Detector |
01-Sep-2008 |
93 pages |
| Authors:
John C Rayburn; James E Carson; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The Global Positioning System (GPS) navigation signal is extremely vulnerable to intentional and unintentional interference. Increased dependence on GPS by military users has created a need to quickly detect and locate interference at its source. Current methods for detecting and locating GPS interference sources employ a network of multiple sensors to identify interference. The data collected from sensors is then sent to a remote centralized processing station and analyzed to ... |
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| Variation of Oxygen-to-Carbon Ratio in Oxyacetylene Flame |
Aug-2008 |
5 pages |
| Authors:
L V Saraf; K J Bunch; M H Engelhard; P L Gassman; BATTELLE PACIFIC NORTHWEST LABS RICHLAND WA
|
| We present micro-structural and surface analysis of carbon soot using variation in C2H2 to O2 ratio in oxyacetylene flame torch. Preliminary analysis indicate that at higher oxygen content, formation of SiO2 nanotubes and amorphous-SiC like structure take place while at higher C2H2 flame content, we observe majority of amorphous carbon with an evidence of some amorphous sp3 hybridization. |
|
| Nurse Staffing Proportions and Negative Outcomes |
23-Jun-2008 |
35 pages |
| Authors:
John L Ament; MARTIN ARMY COMMUNITY HOSPITAL FORT BENNING GA
|
| This retrospective study examined the nurse staffing proportion at Martin Army Community Hospital and whether this proportion was a significant predictor of reported negative inpatient outcomes. The proportion of nursing staff to patients was examined to determine if there is a correlation to three specific diagnoses. The specific diagnoses were post operative wound infection, pneumonia, and decubitus ulcers, as captured from the hospital data repository (MHS MART or M2). The ... |
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| Injury Reduction Effectiveness of Prescribing Running Shoes Based on Foot Shape in Basic Combat Training |
01-Jun-2008 |
101 pages |
| Authors:
Salima Darakjy; Keith G Hauret; Nakia Clemmons; Steve Tobler; Kelly Williams; Tyson Grier; Joseph J Knapik; David Swedler; Mark Lester; Steven H Bullock; ARMY CENTER FOR HEALTH PROMOTION AND PREVENTIVE MEDICINE ABERDEEN PROVING GROUND MD
|
| In Basic Combat Training (BCT) running shoes are prescribed based on plantar foot shape (reflecting longitudinal arch height). In response to a request from the Military Training Task Force of the Defense Safety Oversight Council this study examined whether or not this prescription technique influenced injury risk. After foot examinations BCT recruits in an experimental group (E, n=1,079 men, 456 women) were prescribed motion control stability or cushioned shoes for ... |
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| The Impact of Heat Release in Turbine Film Cooling |
JUN 2008 |
165 pages |
| Authors:
Dave S. Evans; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| The Ultra Compact Combustor is a design that integrates a turbine vane into the combustor flow path. Because of the high fuel-to-air ratio and short combustor flow path, a significant potential exists for unburned fuel to enter the turbine. Using contemporary turbine cooling vane designs, the injection of oxygen-rich turbine cooling air into a combustor flow containing unburned fuel could result in heat release in the turbine and a large ... |
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| Creep-Rupture and Fatigue Behavior of a Notched Oxide/Oxide Ceramic Matrix Composite at Elevated Temperature |
JUN 2008 |
116 pages |
| Authors:
Barth H. Boyer; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| The inherent resistance to oxidation of oxide/oxide ceramic matrix composites makes them ideal for aerospace applications that require high temperature and long life under corrosive environments. The ceramic matrix composite (CMC) of interest in the study is the Nextel (tm) 720/Alumina (N720/A) which is comprised of an 8-harness satin weave of Nextel (tm) fibers embedded in an alumina matrix. One of the top applications for N720/A is in the combustion ... |
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| Eisenhower's Warning Realized: The Issues with the U.S. Reliance on Contractors in the Battlespace |
04-Apr-2008 |
95 pages |
| Authors:
Gary D Smith; NATIONAL DEFENSE UNIV NORFOLK VA JOINT FORCES STAFF COLL
|
| The United States has relied upon contractors in every battle. Yet the reliance has risen steadily since the 1990s. The numbers have risen from a 1 to 65 troop to contractor ratio in Desert Storm to 1 to 1 in Iraqi and Afghanistan operations. Reasons vary for the use. The end of the Cold War is often sited as the main driver. Other drivers include the increased use of outsourcing. ... |
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| High-Speed Photographic Study of Wave Propagation and Impact Damage in Transparent Laminates |
01-Apr-2008 |
64 pages |
| Authors:
Elmar Straburger; M O Steinhauser; FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E V MUNICH (GERMANY F R)
|
| Conventional transparent armor consists of glass laminates with polymer interlayer and backing. It has been demonstrated that the materials, the ratio of materials, and the type and thickness of the interlayers affect the ballistic efficiency of the laminate. Borosilicate glass, Starphire ultra-clear soda-lime glass, and the transparent, polycrystalline ceramic AION are materials being considered for transparent armor applications. A comprehensive series of Edge-on Impact tests has been conducted in order ... |
|
| Reactions of PO(x)Cl(y)-ions with O(2)(a1-delta-g), H(2)O, and Cl(2) at 298 K |
10-Mar-2008 |
5 pages |
| Authors:
A A Viggiano; Anthony J Midey; Itzhak Dotan; AIR FORCE RESEARCH LAB HANSCOM AFB MA SPACE VEHICLES DIRECTORATE
|
| The rate constants and product branching ratios for the reactions of phosphorus oxychloride anions, POxCly for x = 1-2 and y = 1-3, with 02(a'Ag), C12 and H20 have been measured in a selected ion flow tube (SIFT) at 298 K. A mixture of 02(a'Ag) in 02 has been produced using a recently designed chemical singlet oxygen generator (sparger) with an emission detection scheme adopted previously in our laboratory. The ... |
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| Analysis of Non-Uniform Gain for Control of a Deformable Mirror in an Adaptive-Optics System |
MAR 2008 |
131 pages |
| Authors:
Kevin P. Vitayaudom; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| The objective of this research was to develop and experimentally verify the use of spatially varying gain maps on the servo-loop controller of a deformable mirror for improvements in the performance of an adaptive optics system and the mitigation of instabilities that can occur over edge actuators of a deformable mirror. The edge subapertures of a Shack-Hartmann wavefront sensor have lower signal-to-noise ratios and are more susceptible to measurement errors ... |
|
| Electro-Responsive Behaviour Multi-Wall Nanotubes/Gelatin Composites and Cross-Linked Gelatin Electrospun Mats |
11 FEB 2008 |
26 pages |
| Authors:
Soo-Young Park; KYUNGPOOK NATIONAL UNIV DAEGU (SOUTH KOREA) DEPT OF POLYMER SCIENCE
|
| Swelling, states of water, morphology, stability in the aqueous solution, and electro-mechano- chemical bending behaviors of the gelatin/chitosan blend system were studied in order to clarify the potential use of this blend system as an actuator. The gelatin/chitosan blend system was prepared in order to avoid dissolution of the pure chitosan film system in an aqueous medium and the rigidity and easy degradation of the pure gelatin system in the ... |
|
| Structural Studies on Toxins and Virulence Factors of Yersinia pestis |
Feb-2008 |
12 pages |
| Authors:
Subramanyan Swaminathan; BROOKHAVEN NATIONAL LAB UPTON NY
|
| In this final report we present our efforts on two or three fronts. We were working on the expression purification and crystallization of complexes of YopB and YopD with other proteins like their chaperones. We have made progress in purifying YopB:YopD:SycD complex. However this is a challenging process and the amount of homologous protein is a problem. Since the expression levels of different components of the complex are different the ... |
|
| Morphological Analysis of Three Populations of Anopheles (Nyssorhynchus) Nuneztovari Gabaldon (Diptera: Culicidae) from Colombia |
Feb-2008 |
9 pages |
| Authors:
Mayury F Ramos; Ranulfo G Obando; Marco F Suarez; David Lopez; Richard Wilkerson; Maria A Sallum; UNIVERSIDAD DEL VALLE CALI (COLOMBIA)
|
| Based on the results of comparative analyses of 1,039 specimens of several progenies of Anopheles nuneztovari from three localities in Colombia, eight costal wing spot patterns were observed. Patterns I and III were the most frequent: 77.96% and 11.36%, respectively. Using the diagnostic characters ratio of the length of the basal dark area of hind tarsomere II/length of hind tarsomere II, ratio of the length of the humeral pale spot/length ... |
|
| Spatially Tailored and Functionally Graded Light-Weight Structures for Optimum Mechanical Performance |
15-Jan-2008 |
27 pages |
| Authors:
Victor Birman; MISSOURI UNIV-ROLLA
|
| The study illustrates the effectiveness of three-phase functionally graded material systems where stiff (typically ceramic) particles are incorporated within the fiber-reinforced medium. Added particles increase the stiffness of the fiber-reinforced material reducing static and dynamic stresses and deformations, increasing buckling loads and fundamental frequencies and enhancing the response to blast loading. The micromechanical model presented in the study represents an extrapolation of the Mori-Tanaka homogenization approach to the case of ... |
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| Can a Difference in Molecular Weights Cause an Eruption in a Driven Flow of Self-Organizing Immiscible System? |
Jan-2008 |
7 pages |
| Authors:
Ras Pandey; Joseph Gettrust; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS MARINE GEOACOUSTICS DIV
|
| Driven flow of a non-equilibrium non-conservative (NENC) system with a mixture of immiscible particles [A, B of molecular weight M(A), M(B)) exhibits self-organizing patterns (segregation, phase-separation, etc.) in steady-state. The flow response (v) of mass flux density (j) to bias (H), v = (partial derivative)j/(partial derivative)H in steady-state is found to be sensitive to molecular weight ratio (alpha = M(B)/(M(A)). While the flux density (j) responds lineally to bias for ... |
|
| 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 ... |
|
| An Analysis of Three-Channel RSNS Virtual Spacing Direction Finding System |
DEC 2007 |
91 pages |
| Authors:
Kevin Kwai; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The design and performance analysis of a three-channel Robust Symmetrical Number System (RSNS) virtual spacing direction finding (DF) system was carried out in this thesis. The design was based on hardware used in the previous work in which a digital three-channel RSNS-based interferometer was built. In designing a RSNS virtual spacing DF system it was found that the ratio between the modulus is an important parameter. The ratio affects the ... |
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| Stressful Military Training: Endocrine Reactivity, Performance, and Psychological Impact |
Dec-2007 |
9 pages |
| Authors:
Jared P Reis; Marcus K Taylor; Kenneth P Sausen; Lilianne R Mujica-Parodi; Eric G Potterat; Amanda E Markham; Genieleah A Padilla; Deborah L Taylor; NAVAL HEALTH RESEARCH CENTER SAN DIEGO CA
|
| We examined the responsiveness of both cortisol and dehydroepiandrosterone sulfate (DHEAS) to the stress of survival training in military men and evaluated relationships to performance, peritraumatic dissociation, and the subsequent impact of stressful events. |
|
| Pharmacokinetics-Pharmacodynamics of Gatifloxacin in a Lethal Murine Bacillus Anthracis Inhalation Infection Model |
DEC 2007 |
7 pages |
| Authors:
Paul G. Ambrose; Alan Forrest; William A. Craig; Christopher M. Rubino; Sujata M. Bhavnani; George L. Drusano; Henery S. Heine; ARMY MEDICAL RESEARCH INST OF INFECTIOUS DISEASES FORT DETRICK MD
|
| We determined the pharmacokinetic-pharmacodynamic (PK-PD) measure most predictive of gatifloxacin efficacy and the magnitude of this measure necessary for survival in a murine Bacillus anthracis inhalation infection model. We then used population pharmacokinetic models for gatifloxacin and simulation to identify dosing regimens with high probabilities of attaining exposures likely to be efficacious in adults and children. In this work, 6- to 8-week-old nonneutropenic female BALB/c mice received aerosol challenges of ... |
|
| Computer Simulation of Mechanical and Physical Properties of Carbon Foam Materials |
Dec-2007 |
5 pages |
| Authors:
Serguei Kanaoun; INSTITUTO TECNOLOGICO Y DE ESTUDIOS SUPERIORES DE MONTERREY (MEXICO)
|
| The project is devoted to the problem of the numerical simulation of the effective elastic, thermo and electro conductive properties of open-cell foam materials. The Laguerre tessellation procedure is applied for the construction of skeletons of random foam microstructures with prescribed distributions of the cell diameters. A four-parametric approximation of the ligament shapes in the open-cell foams is proposed. For simulation of the elastic properties of open -cell foams, a ... |
|
| An Experimental Investigation Into The Effect Of Plasma On The Flow Features Of An Axisymmetric Jet |
OCT 2007 |
387 pages |
| Authors:
Richard E. Huffman; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| The main goal of the research presented was to determine the differences between a plasma field and neutral field flow structure (both mean and turbulent effects) for varying Mach number. The overall objective was to describe the effect of radio frequency capacitively coupled plasma on the flow features of compressible axisymmetric jets in Nitrogen. Three flows were investigated: perfectly expanded jets, highly underexpanded jets, and jets created by a constant-diameter ... |
|
| The Ratio of Blood Products Transfused Affects Mortality in Patients Receiving Massive Transfusions at a Combat Support Hospital |
OCT 2007 |
10 pages |
| Authors:
Matthew A. Borgman; Philip C. Spinella; Jeremy G. Perkins; Kurt W. Grathwohl; Thomas Repine; Alec C. Beekley; James Sebesta; Donald Jenkins; Charles E. Wade; John B. Holcomb; BROOKE ARMY MEDICAL CENTER FORT SAM HOUSTON TX
|
| Background: Patients with severe traumatic injuries often present with coagulopathy and require massive transfusion. The risk of death from hemorrhagic shock increases in this population. To treat the coagulopathy of trauma, some have suggested early, aggressive correction using a 1:1 ratio of plasma to red blood cell (RBC) units. Methods: We performed a retrospective chart review of 246 patients at a US Army combat support hospital, each of who received ... |
|
| The Ratio of Fibrinogen to Red Cells Transfused Affects Survival in Casualties Receiving Massive Transfusions at an Army Combat Support Hospital |
OCT 2007 |
8 pages |
| Authors:
Harry K. Stinger; Philip C. Spinella; Jeremy G. Perkins; Kurt W. Grathwohl; Jose Salinas; Wenjun Z. Martini; John R. Hess; Michael A. Dubick; Clayton D. Simon; Alec C. Beekley; BROOKE ARMY MEDICAL CENTER FORT SAM HOUSTON TX
|
| Background: To treat the coagulopathy of trauma, some have suggested early and aggressive use of cryoprecipitate as a source of fibrinogen. Our objective was to determine whether increased ratios of fibrinogen to red blood cells (RBCs) decreased mortality in combat casualties requiring massive transfusion. Methods: We performed a retrospective chart review of 252 patients at a U.S. Army combat support hospital who received a massive transfusion (>10 units of RBCs ... |
|
| PSMA-Targeted Nano-Conjugates as Dual-Modality (MRI/PET) Imaging Probes for the Non-Invasive Detection of Prostate Cancer |
OCT 2007 |
12 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 nanopartides so that the sensitivity and specificity of prostate cancer diagnosis could be significantly improved. In the second year a rigorous synthetic protocol has been developed to prepare dextran TI 0-coated iron oxide nanoparticles with uniform size distribution and better controllable reproducibility compared to the method ... |
|
| Electro-Magnetic Actuated Valve for MEMS Fuel Metering System |
01-Sep-2007 |
45 pages |
| Authors:
Albert P Pisano; CALIFORNIA UNIV BERKELEY
|
| The goal of this research project is to develop a fuel injection system which delivers the desired ratio of air/fuel mixture to small scale internal combustion engines. Small scale engines require precise fuel control, but the fuel delivery system must be small and low-power. Our research is focused on the development of a planar fuel valve with high fuel delivery rates. The planar nature allows for successful system integration with ... |
|
| The Identification of Splice Variants as Molecular Markers in Parkinson's Disease |
SEP 2007 |
77 pages |
| Authors:
Gloria E. Meredith; ROSALIND FRANKLIN UNIV OF MEDICINE AND SCIENCE CHICAGO IL
|
| Alternative splicing is responsible for producing several products from a single transcript and can cause pathogenic changes in RNA in neurodegenerative disease. This proposal tests the hypothesis that regulation of normal splicing is disrupted in Parkinson's disease (PD). Scope: Experiments are designed to determine splicing products in the brain and blood of experimental MPTP models of PD and the blood of newly diagnosed PD patients, who are not yet on ... |
|
| Ignition and Dentonation Characteristics of Hydrogen and Hydrocarbon Fuels in a PDE |
SEP 2007 |
15 pages |
| Authors:
Tim Heifrich; Fred Schauer; Royce Bradley; John Hoke; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH TURBINE ENGINE DIV
|
| Over the past two decades, several fuels have been tested in pulsed detonation engines (PDEs) throughout the world. This research focuses on developing a baseline set of ignition and detonation performance measures for six distinct fuels in air: Hydrogen, ethylene, propane, aviation gasoline (avgas), JP-8, and Fischer-Tropsch JP-8 (S-8). To quantify the ignition and detonation performance, four parameters are examined: Ignition time, deflagration- to-detonation transition (DDT) time, DDT distance, and ... |
|
| Finite Element Based Structural Damage Detection Using Artificial Boundary Conditions |
SEP 2007 |
183 pages |
| Authors:
Rafael A. Lagunes Arteaga; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Finite element models can be used to discern the location and severity of damage in structures. This is frequently pursued by using the differences in measured and computed natural frequencies, in conjunction with the sensitivities calculated using the FE model. Given that a modal test produced a limited number of natural frequencies for a structure, the concept of Artificial Boundary Conditions (ABC) was developed, which yields additional natural frequency information ... |
|
| Reduced Input Throw and High-speed Driving |
08 AUG 2007 |
10 pages |
| Authors:
Kaleb McDowell; Victor Paul; Jillyn Alban; TACOM RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI
|
| The U.S. Army is examining new and evolutionary concepts for military vehicles for their future force. In particular, drive-by-wire technology coupled with non-standard driving control devices have the potential to lead to improved driving performance, reduced Soldier training time, crash prevention, smaller vehicle space claims, and improved vehicle safety in military vehicles. However, several human performance issues are associated with non-standard control devices for manual driving. Specifically, this investigation focuses ... |
|
| Non-Reacting and Combusting Flow Investigation of Bluff Bodies in Cross Flow (Postprint) |
AUG 2007 |
13 pages |
| Authors:
Barry Kiel; Kyle Garwick; Amy Lynch; James R. Gord; Terrence Meyer; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIRECTORATE
|
| This paper is the first in a series of papers studying the behavior of bluff body stabilized flames. In this research a combination of Laser Doppler Velocimetry (LDV), and High Speed Imaging are used to investigate these flames. LDV data taken over several non-combusting operating conditions detail the recirculation zone behind the bluff body as well as the effect of inlet conditions on the Karman Street vortex shedding that occurs. ... |
|
| Obtaining Unique, Comprehensive Deep Seismic Sounding Data Sets for CTBT Monitoring and Broad Seismological Studies |
02 JUL 2007 |
62 pages |
| Authors:
Igor B. Morozov; Elena A. Morozova; Scott B. Smithson; WYOMING UNIV LARAMIE DEPT OF GEOLOGY AND GEOPHYSICS
|
| In cooperation with the Center for Geophysical and Geoecological Studies (GEON, Moscow, Russia), the University of Wyoming and now also with the University of Saskatchewan digitized, edited, transferred into standard digital formats, and delivered to public domain seismic records from 12 major Deep Seismic Sounding (DSS) projects acquired in 1970-1980's in the former Soviet Union. The data include 3-component records from 22 Peaceful Nuclear Explosions (PNEs) and over 500 chemical ... |
|
| A Quantitative Analysis of Starting Jet Vortex Ring Entrainment at Low Reynolds Number |
07 MAY 2007 |
110 pages |
| Authors:
Alex G. Dulude; NAVAL ACADEMY ANNAPOLIS MD
|
| The future propulsion of very small unmanned air and underwater vehicles operating at Reynolds numbers in the hundreds or less may be accomplished by pulsing a jet of fluid rather than more conventional methods of propulsion such as propellers and turbo jets as used by large-scale vehicles. Pulse jet propulsion produces trailing vortex rings and recent research concerning the formation and evolution of vortex rings has suggested that these structures ... |
|
| An Analysis of the Tooth to Tail Ratio in a Brigade Combat Team Between 1990 to Present |
02 MAY 2007 |
61 pages |
| Authors:
Peter J. Crandall; ARMY COMMAND AND GENERAL STAFF COLL FORT LEAVENWORTH KS SCHOOL OF ADVANCED MILITARY STUDIES
|
| This monograph examines the question: Does the organizational change affecting the "tooth to tail" ratio sustain the flexibility and tactical mobility of the heavy brigade combat team? The monograph looked at the Army during Army of Excellence, Force XXI, and the Modular force to compare and contrast. The monograph briefly looks at the history of organization changes to the force, and then looks a little closer at the reasons why ... |
|
| The Impact of the 6:3 Polyunsaturated Fatty Acid Ratio on Intermediate Markers of Breast Cancer |
01 MAY 2007 |
11 pages |
| Authors:
Alana Hudson; PITTSBURGH UNIV PA
|
| Extensive experimental evidence has shown the intake of omega-6 polyunsaturated fatty acids (PUFAs) promotes breast cancer (1), while consumption of omega-3 PUFAs inhibits this disease. (2) Furthermore, it appears that the cancer promoting activity of the omega-6 fatty acids is abrogated by the competitive inhibition of omega-3 fatty acids (3,4). Although the mechanism by which the 6:3 PUFA ratio may promote breast cancer is unknown, it is suggested that a ... |
|
| Panel 6 -- Contracting for Support of Military Operations |
May-2007 |
7 pages |
| Authors:
Victoria Greenfield; Richard L Dunn; Jeffrey P Parsons; NAVAL ACADEMY ANNAPOLIS MD
|
| These briefing charts summarize Panel 6, Contracting for Support of Military Operations, one of the panels that met during the 4th Annual Acquisition Research Symposium of the Naval Postgraduate School, Acquisition Research: Creating Synergy for Informed Change, which was held in Monterey, CA on 16-17 May 2007. One chart contains a table of the numbers of civilians and military personnel who participated in various wars or conflicts over the years ... |
|
| Probabilistic Weather Forecasting for Winter Road Maintenance |
03 APR 2007 |
28 pages |
| Authors:
Veronica J. Berrocal; Adrian ?E. Raftery; Tilmann Gneiting; Richard C. Steed; WASHINGTON UNIV SEATTLE DEPT OF STATISTICS
|
| Road maintenance is one of the main problems Departments of Transportation face during winter time. Anti-icing, i.e. applying chemicals to the road to prevent ice formation, is often used to keep the roads free of ice. Given the preventive nature of anti-icing, accurate predictions of road ice are needed. Currently, anti-icing decisions are usually based on deterministic weather forecasts. However the costs of the two kinds of error are highly ... |
|
| Some Implications of Increasing U.S. Forces in Iraq |
APR 2007 |
20 pages |
| Authors:
Adam Talaber; CONGRESSIONAL BUDGET OFFICE (U S CONGRESS) WASHINGTON DC
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| The Administration is currently planning (and has begun to execute) an increase in U.S. ground forces in Iraq. That plan calls for increasing the number of U.S. combat brigades in-theater by 5 above the December 2006 level of 15, peaking at 20 combat brigades deployed. As of now, the Administration has not specified how long it plans to sustain such an increase. This Congressional Budget Office (CBO) analysis considers the ... |
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| Accounting for and Managing Contractors in Contingency Operations |
26-Mar-2007 |
62 pages |
| Authors:
Robert W Schumitz; TEXAS UNIV AT AUSTIN INST FOR ADVANCED TECHNOLOGY
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| This paper will provide an analysis of accountability and management of contractors on the battlefield and existing policies, regulations, and instructions associated with the issue. Contractors play an ever-increasing role in the sustainment of joint forces engaged in various phases of combat operations in Iraq and Afghanistan. Contractors also support every U.S. government agency represented on the battlefield today. Contractor support has steadily increased as a result of the reduction ... |
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| Effective Mobile Routing Through Dynamic Addressing |
MAR 2007 |
71 pages |
| Authors:
Heungsoon Park; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| Military communications has always been an important factor in military victory and will surely play an important part in future combat. In modern warfare, military units are usually deployed without existing network infrastructure. The IP routing protocol, designed for hierarchical networks cannot easily be applied in military networks due to the dynamic topology expected in military environments. Mobile ad-hoc networks (MANETs) represent an appropriate network for small military networks. But, ... |
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| Possible Gravitational Anomalies in Quantum Materials. Phase 1: Experiment Definition and Design |
FEB 2007 |
57 pages |
| Authors:
M. Tajmar; K. Hense; AUSTRIAN RESEARCH CENTERS SEIBERSDORF RESEARCH (ARCS) SEIBERSDORF (AUSTRIA)
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| One of the authors (MT) recently published a paper, suggesting for the first time that a reported disagreement between experimental measurements and theoretical predictions for the magnetic field in rotating superconductors might arise from an anomalous high-order gravitomagnetic contribution (also known as frame dragging or Lense-Thirring effect). In normal matter, the ratio between electromagnetic and gravitational fields is given by the difference in the respective permeabilities. However, magnetic fields generated ... |
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| Possible Gravitational Anomalies in Quantum Materials. Phase 2: Experiment Assembly, Qualification and Test Results |
FEB 2007 |
56 pages |
| Authors:
M. Tajmar; AUSTRIAN RESEARCH CENTERS SEIBERSDORF RESEARCH (ARCS) SEIBERSDORF (AUSTRIA)
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| The author recently published a paper, suggesting for the first time that a reported disagreement between experimental measurements and theoretical predictions for the magnetic field in rotating superconductors might arise from an anomalous high-order gravitomagnetic contribution (also known as frame dragging or Lense-Thirring effect). In normal matter, the ratio between electromagnetic and gravitational fields is given by the difference in the respective permeabilities. However, magnetic fields generated as a consequence ... |
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