| Tightly Coupled Mechanistic Study of Materials in the Extreme Space Environment |
Sep 2012 |
12 pages |
| Authors:
Deborah A Levin; Adri van Duin; Krishna Rajan; Raymond Sedwick; Mark Lewis; PENNSYLVANIA STATE UNIV STATE COLLEGE
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 | Briefing charts presented at the 2012 Space Propulsion and Poser Program Review Held 10-14 Sep 2012 in Arlington, VA on mechanics and materials in space environments. |
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| High Performance Piezoelectric Actuators and Wings for Nano Air Vehicles |
26 Aug 2012 |
144 pages |
| Authors:
Christopher D Rahn; Srinivas A Tadigadapa; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| Swarms of flying robotic insects could revolutionize hazardous environment exploration, search and rescue missions, and military applications. Reducing size to insect scale enables entrance into extremely narrow spaces with inherent stealth advantages. For mass production, these vehicles must have reliable and repeatable fabrication processes that define flapping wing mechanisms with microscale features and produce large flapping amplitudes at frequencies in the range of many insects. This report focuses on the ... |
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| Energy Harvesting on Spacecraft Using Electrodynamic Tethers |
Aug 2012 |
37 pages |
| Authors:
Sven G Bilen; Jesse K McTernan; Brian E Gilchrist; Iverson C Bell; David Liaw; Nestor R Voronka; Robert P Hoyt; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| 3D Modeling of Iran and Surrounding Areas from Simultaneous Inversion of Multiple Geophysical Datasets (Postprint). Annual Report 3 |
22 Mar 2012 |
22 pages |
| Authors:
Charles J Ammon; Monica Maceira; Michael Cleveland; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| The objective of this work is to help improve seismic monitoring technology through the development and application of advanced multivariate inversion techniques to generate realistic, comprehensive, and high-resolution 3D models of the seismic structure of the crust and upper mantle that satisfy independent geophysical datasets. The focus is on the region surrounding Iran from the east coast of the Mediterranean in the west, to Pakistan in the east, a region ... |
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| Health Monitoring of Composite Structures Using Guided Waves |
20 Jan 2012 |
101 pages |
| Authors:
Joseph L Rose; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| Two guided wave SHM approaches were developed in this project. The first approach is based on a guided wave tomographic technique, in which the region surrounded by a sparse sensor array is monitored. The second one is a phased array approach, in which sensors are attached to a structure in a compact format to form an array. The region subjected to inspection and monitoring is the region outside the array. ... |
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| Establishing and Validating Empirically-Based Ground Truth Criteria for Seismic Events Recorded on Regional Networks (Postprint) |
30 Dec 2011 |
12 pages |
| Authors:
Richard A Brazier; Karen B Boomer; Andrew Nyblade; John P O'Donnell; Steven Myers; Jennifer Kokoska; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| New empirically-based ground truth (EBGT) local criteria have been developed for a variety of geologic settings for which data sets containing GT0 events (explosions and mine tremors) are available, local crustal structure is well known, and hand-picked arrival times have been obtained. There are now criteria for the Main Ethiopian Rift and preliminary criteria for the Tibetan Plateau. In the geologically very complex region of the Main Ethiopian Rift, the ... |
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| The Reduction of Advanced Military Aircraft Noise |
Dec 2011 |
191 pages |
| Authors:
Philip J Morris; Dennis McLaughlin; Victor Sparrow; James Bridges; Brenda Henderson; Kenneth Plotkin; Steve Martens; Richard McKinley; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| This report describes a combined experimental and computational study of the generation and radiation of jet noise from high performance military fighter aircraft. An emphasis is on the methodology for scaling measurements at small and moderate scale to full scale aircraft engines. Promising concepts for jet noise reduction are explored at small and moderate scale. Numerical simulations are performed to support the experiments and provide additional insight into the noise ... |
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| Molecular Machine-Based Active Plasmonics |
21 Jul 2011 |
12 pages |
| Authors:
Tony J Huang; J F Stoddart; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| In the past year, we have made the following significant progress: 1) We demonstrated dual-stimulus switching of a [2]catenane in water. 2) We synthesized mechanically stabilized tetrathiafulvalene radical dimmers. 3) We have developed an efficient technique to fabricate optically thin metallic films with subwavelength patterns and their complements simultaneously. 4) We demonstrate a scalable, rapid, and inexpensive fabrication method based on the salting-out quenching technique and colloidal lithography for the ... |
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| Hard Sensor Fusion for COIN Inspired Situation Awareness |
Jul 2011 |
7 pages |
| Authors:
Matthew S Baran; Donald J Natale; Richard L Tutwiler; Christopher Griffin; John M Daughtry; Matthew M McQuillan; Jeffrey Rimland; David L Hall; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| Counter Insurgency operations require the ability to develop accurate representations of the physical environment and the human landscape in various conditions (e.g., urban and non-urban, day and night, and various weather conditions). We are developing innovative sensor suites and processing techniques suitable for such domains as part of a larger effort to support human-centric hard/soft data fusion. In this paper, we present a sensor suite, an information processing architecture, examples ... |
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| Anticipating Viral Species Jumps: Bioinformatics and Data Needs |
Jun 2011 |
29 pages |
| Authors:
Meg L Flanagan; Terrance J Leighton; Joseph P Dudley; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| Viral species jumps (also called host jumps) occur when a virus acquires the ability to infect and spread among individuals of a new host species. Historical examples of animal viruses that jumped into human hosts include HIV, SARS coronavirus and influenza A virus. Globally, these viruses have exacted high socioeconomic and health costs. The ability to predict viral species jumps can reduce such costs by enabling swifter outbreak mitigation strategies ... |
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| Experimental Determination of Quantum and Centroid Capacitance in Arsenide-Antimonide Quantum-Well MOSFETs Incorporating Nonparabolicity Effect |
May 2011 |
8 pages |
| Authors:
Ashkar Ali; Himanshu Madan; Rajiv Misra; Ashish Agrawal; Peter Schiffer; J B Boos; Brian R Bennett; Suman Datta; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| Experimental gate capacitance (Cg ) versus gate voltage data for InAs0.8Sb0.2 quantum-well MOSFET (QWMOSFET) is analyzed using a physics-based analytical model to obtain the quantum capacitance (CQ) and centroid capacitance (Ccent). The nonparabolic electronic band structure of the InAs0.8Sb0.2 QW is incorporated in the model. The effective mass extracted from Shubnikov?de Haas magnetotransport measurements is in excellent agreement with that extracted from capacitance measurements. Our analysis confirms that in the ... |
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| Chemical Characterization of Tribological and Biomaterial Surfaces With Nanoscale Spatial Resolution |
28 Feb 2011 |
20 pages |
| Authors:
Seong H Kim; ALI ERDEMIR; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| The overall goal of this study is to gain molecular-level understanding of the chemical properties of the diamond like carbon (DLC) surface exposed at various environmental conditions so that this knowledge can be used to design better DLC coatings and operation conditions. DLC coatings have great potentials to reduce frictional energy loss and increase service life of mechanical systems. However, the near-frictionless and near-wearless behaviors are observed only in vacuum ... |
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| Anticipating the Species Jump: Surveillance for Emerging Viral Threats |
Dec 2010 |
28 pages |
| Authors:
Meg L Flanagan; Colin R Parrish; Sarah Cobey; Gregory E Glass; Robin M Bush; Terrance J Leighton; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| Emerging infectious diseases (EID) pose international security threats because of their potential to inflict harm upon humans, crops, livestock, health infrastructure, and economies. Some zoonotic (animal) viruses pose unique challenges because of their ability to infect new host species. For example, influenza and human immunodeficiency viruses originally infected animals, but subsequent mutations enabled these viruses to jump to new human hosts. Zoonotic disease surveillance is typically triggered after animal pathogens ... |
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| IMS Infrasound Monitoring Test Site at Trafelberg, Austria: Preliminary Results from In-Situ Response Measurements of Infrasound Elements |
Sep 2010 |
23 pages |
| Authors:
Thomas Gabrielson; Georgios Haralabus; Stefi Stefanova; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| The International Monitoring System (IMS) of the Comprehensive Nuclear Test-Ban Treaty Organization (CTBTO) has a unique infrasound test site (I99AT) with four wind-noise-reduction pipe-array systems in close enough proximity to allow simultaneous measurements under similar environmental conditions. It was designed as a facility to study the effectiveness of various wind-noise-reduction systems so it is clear of trees, vegetation, or other wind breaks. The persistent winds presented a challenge for response ... |
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| Developing and Exploiting a Unique Dataset from South African Gold Mines for Source Characterization and Wave Propagation |
Sep 2010 |
12 pages |
| Authors:
Jordi Julia; Andrew A Nyblade; Rengin Gok; William R Walter; Lindsay Linzer; Ray Durrheim; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| In this project, we have developed and exploited a unique seismic dataset to address the characteristics of small seismic events and the associated seismic signals observed at local ( 200 km) and regional ( 2000 km) distances. The dataset has been developed using mining-induced events from three deep gold mines in South Africa recorded on in-mine networks ( 1 km) composed of tens of high-frequency sensors, a network of four ... |
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| Structural and Functional Mechanisms of Adaptations of WrbA in Extremophilic Organisms |
11 May 2010 |
9 pages |
| Authors:
James G Ferry; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| Properties of FMN-containing NADH:quinone oxidoreductases (WrbA) from the hyperthermophile Archaeoglohus fudgidus and the mesophile Escherichia coli were investigated to gain an understanding of the mechanisms by which proteins in extremophilic organisms adapt to high temperature. A model of the thermophilic enzyme was constructed based on the crystal structure of the mesophilic counterpart to guide experiments. An electrochemical cell was designed and constructed to probe the redox properties of FMN. Only ... |
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| Colloidal Quantum Dot Absorption Enhancement in Flexible Fano Filters |
25 Feb 2010 |
8 pages |
| Authors:
Li Chen; Hongjun Yang; Zexuan Qiang; Huiqing Pang; Lei Sun; Zhenqiang Ma; Ryan Pate; Adrienne Stiff-Roberts; Shuai Gao; Jian Xu; Gail J Brown; Weidong Zhou; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| We report here modified absorption property of colloidal quantum dots (CQDs) inside flexible Fano filters-made of patterned single crystalline silicon nanomembrane transferred onto flexible plastic substrates. Enhanced optical absorption was obtained both experimentally and theoretically, when the CQD absorption peak spectrally overlaps with Fano resonance peak. On the other hand, suppressed absorption was observed when the Fano resonance has no spectral overlap with the CQD absorption bands. |
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| Development of Improved Molecular Excitation Models |
05 Feb 2010 |
8 pages |
| Authors:
Deborah Levin; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| With respect to our modeling of condensation in supersonic expansions, we have used molecular dynamics to derive condensation based models for DSMC for non-Lennard Jonesian gases such as water, carbon dioxide, and ammonia, common combustion products found in rocket plumes. The challenge was to incorporate charge polarization terms in the cluster potential, develop and automate a strategy for recognizing the formation of clusters in an MD study of a supersonic ... |
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| Measurement and Analysis of High-Frequency Scattering Statistics and Sound Speed Dispersion |
22 Dec 2009 |
6 pages |
| Authors:
Anthony P Lyons; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| In many cases, clear mechanisms in areas of increased false alarm (FA) are unclear, although possible causes include rock outcrops and seafloor of mixed bottom type (e.g., mixed rock and sand). The long-term goals of this research program aim primarily to address this shortfall by providing knowledge of the exact mechanisms causing false alarms. This knowledge will be used to develop methods for simulating FA and predicting where high FA ... |
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| Assessment Of Acoustic Adaptations For Noise Compensation In Marine Mammals |
30 Sep 2009 |
4 pages |
| Authors:
Susan E Parks; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| The proposed research will address the fundamental theoretical issue of noise compensation mechanisms in the vocal communication of marine mammals. Noise compensation mechanisms are important for improving signal transmission with an energy limited source. A better understanding of marine mammal noise compensation mechanisms can potentially provide effective means of improving signal transmission in a noisy marine environment and for assessing the impact of man-made sounds on the use of sound ... |
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| Modeling and Simulation of MEMS Microthrusters |
25 JUN 2004 |
26 pages |
| Authors:
Deborah A. Levin; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| In this briefing the thermal effect on micropropulsion design is explored through the modeling and simulation of cold gas microthrusters and higher temperature microthrusters. |
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| Modal Analysis Using the Singular Value Decomposition |
MAY 2004 |
21 pages |
| Authors:
J. B. Fahnline; R. L. Campbell; S. A. Hambric; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| Many methods exist for identifying modal parameters from experimental transfer function measurements. For frequency domain calculations, rational fraction polynomials have become the method of choice, although it generally requires the user to identify frequency bands of interest along with the number of modes in each band. This process can be tedious, especially for systems with a large number of modes, and it assumes the user can accurately assess the number ... |
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| Reactive Sensor Networks (RSN) |
OCT 2003 |
41 pages |
| Authors:
Richard Brooks; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| The Reactive Sensor Networks project was based on a vision of sensor networks as virtual enterprises. A sensor network would be fielded by the military with certain goals in mind. The chaotic nature of the battlespace guarantees that mission parameters will change. The network would have to adapt in response to environmental constraints. RSN developed multiple technologies to enable the network to adapt to changing mission parameters: a) mobile code ... |
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| COTS NETWORKED GROUND SENSORS FOR ARTILLERY LOCALIZATION, |
FEB 2002 |
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| Authors:
DAVID C. SWANSON; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
 | (U) THIS PAPER ADDRESSES THE RAPID DEVELOPMENT AND DEPLOYMENT OF FOUR UNATTENDED GROUND SENSORS TO AN ARTILLERY RANGE FOR DETECTION AND LOCALIZATION OF MUZZLE BLASTS AND SHELL DETONATIONS. TO MEET THE OBJECTIVE OF THE RESEARCH THE EFFORT DESCRIBED SURVEYED A LARGE NUMBER OF PROCESSING PLATFORMS UP TO HARDENED COMMERCIAL PC MOTHERBOARD SYSTEMS. |
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| MONTE CARLO SIMULATION OF SEISMIC LOCATION ERRORS FOR MOVING VEHICLES, |
FEB 2002 |
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| Authors:
Roy J. Greenfield; M. L. MORAN; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| (U) THIS PAPER DISCUSSES A METHOD TO PREDICT THE DISTRIBUTION OF SEISMIC SOURCE MISLOCATION ERRORS FOR TRACKED VEHICLES USING BEARING AND RANGE LOCATION OBTAINED FROM FIELD DATA. TWO TYPES OF DISPLAYS ARE PRESENTED ALLOWING ANALYSIS OF HOW THE LOCATION ERROR CHANGES WITH CHANGES OF THE ARRAY MEASUREMENT ACCURACY, AND SUITED FOR EVALUATING THE IMPACT OF SEISMIC SENSOR CONFIGURATION ON NETWORK TRACKING PERFORMANCE. RESULTS ARE PRESENTED FOR A NUMBER OF DIFFERENT ... |
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| Monte Carlo Simulation of Seismic Location Errors for Moving Vehicles |
04 OCT 2001 |
17 pages |
| Authors:
Roy J. Greenfield; M. L. Moran; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| A method was developed to predict the distribution of seismic source mislocation errors for tracked vehicles using bearing and range (r) location statistics obtained from field data. The method is of use for 1) guiding the design and deployment of seismic sensor networks and 2) statistically modeling seismic network tracking performance. In the present work, a seismic array is composed of one or multiple seismic subarrays each of which makes ... |
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| Pressure Tuning of Intermediate Valence and Multiband Semiconductor Thermoelectric Materials |
27 JUL 2001 |
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| Authors:
John V. Badding; Francis J. DiSalvo; Gerald D. Mahan; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| The conventional means of searching for new materials, in this case efficient thermoelectrics, is to synthesize a large number of compounds and investigate each in detail as a function of materials parameters, such as preparation conditions and doping levels. Each compound thus represents one point in a phase space determined by electronic and structural parameters. With the use of pressure one can continuously adjust the interaction parameters and follow the ... |
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| THE EFFECTS OF THIN, NEAR-SURFACE LAYERS ON SEISMIC SIGNALS, |
JAN 2001 |
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| Authors:
R. J. GREENFIELD; M. L. MORAN; S. A. KETCHAM; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| (U) THIS PAPER PRESENTS RESULTS FOR A VERTICAL POINT FORCE SOURCE AT THE GROUND SURFACE WITH A RECEIVER ON THE SURFACE. SEISMOGRAMS ARE DEMONSTRATED WHICH SHOW THE VERTICLE VELOCITY OF GROUND PARTICLES, WHICH IS ANALOGOUS TO THE SIGNALS RECORDED BY A VERTICAL GEOPHONE. THE RESULTS ARE DENOTED AS WAVENUMBER INTEGRATION. THE FORCE-TIME FUNCTION OF THE VERTICAL POINT FORCE IS SHOWN GRAPHICALLY. |
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| An Independent Component Analysis Blind Beamformer |
DEC 2000 |
78 pages |
| Authors:
Marc L. Salerno; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| Independent Component Analysis (ICA) has been proven to be a very successful method for separating mixed signals blindly. ICA works by using the assumption that signal mixtures are combinations of independent signals. Up to now, ICA has been primarily used to separate signals where multiple amplitude combinations of these signals exist. The most popular of these ICA methods is Blind Source Separation (BSS). This thesis ... |
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| Instrumentation for Surface Flux Measurements |
20 NOV 2000 |
5 pages |
| Authors:
C. Tong; J. C. Wyngaard; S. Khanna; J. G. Brasseur; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| Research instruments, consisting of 2 workstations, 14 sonic anemometers, and 28 fine wire thermocouples, were acquired with funds provided under this grant. This equipment was primarily intended for innovative studies of the resolvable and sub-grid turbulence and fluxes pertinent to large eddy simulation models of the atmospheric boundary layer. This report describes the equipment purchased and gives a brief description of equipment use in seven different field studies of atmospheric ... |
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| DYNAMO: A TOOL FOR MODELING INTEGRATED AIR DEFENSE SYSTEMS, |
OCT 2000 |
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| Authors:
DAVID L. HALL; PAMLELA SEXTON; MIKE WARREN; JAMES ZMYSLO; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| (U) THIS PAPER DESCRIBES A SOFTWARE SYSTEM IMPLEMENTED TO MODEL INTEGRATED AIR DEFENSE SYSTEMS (IADS). THE SYSTEM, CALLED DYNAMO,MODELS THE COMMUNICATION LINKS AND ROUTING FOR INTEGRATED AIR DEFENSE SYSTEMS. DYNAMO ACCOUNTS FOR SENSOR PERFORMANCE, EFFECTS OF TERRAIN, AND DYNAMIC CONFIGURATION OF THE IADS TO FAULT CONDITIONS. NEAR TERM EFFORTS FOCUS ON MODELING THE TARGET TRACKING AND IDENTIFICATION PROCESSES. PLANNED CAPABILITIES INCLUDE THE ABILITY TO ACCOUNT FOR COMMUNICATION DELAYS, DATA FORMATS, ... |
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| DIRTY SECRETS IN MULTISENSOR DATA FUSION, |
OCT 2000 |
|
| Authors:
DAVID L. HALL; ALAN STEINBERG; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| (U) THIS PAPER PRESENTS A SUMMARY OF THE CURRENT STATE AND LIMITATIONS OF DATA FUSION. KEY ISSUES ARE IDENTIFIED THAT LIMIT THE ABILITY TO IMPLEMENT A SUCCESSFUL DATA FUSION SYSTEM. THE PAPER PROVIDES A SUMMARY OF CURRENT PROGRESS IN MULTISENSOR DATA FUSION AND IDENTIFIES AREAS IN WHICH ADDITIONAL RESEARCH IS NEEDED. IN ADDITION THE PAPER DESCRIBES SOME ISSUES OR DIRTY SECRETS IN THE CURRENT STATE OF PRACTICE OF DATA FUSION ... |
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| SEISMIC ACOUSTIC RATIO ESTIMATES USING A MOVING VEHICLE SOURCE, |
JAN 2000 |
|
| Authors:
ROY GREENFIELD; MARK MORAN; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| (U) THIS PAPER DETERMINES THE SEISMIC TO ACOUSTIC SIGNAL COUPLING RATIO (SAR) USING SIGNALS GENERATED BY MOVING MILITARY VEHICLES. THIS IS USEFUL IN SITUATIONS WHERE A CONTROLLED SOURCE CANNOT BE USED, OR WHEN THE PROPERTIES OF THE GROUND SURFACE ARE CHANGING, SUCH AS IN SNOW-COVERED OR FREEZING GROUND. IN THESE CASES THE SAR WILL ASLO CHANGE, ANDN IT IS CONVENIENT TO HAVE METHODS THAT DO NOT REQUIRE A CAREFULLY CONTROLLED ... |
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| THE USE OF AUTOMATED CRITICS TO IMPROVE THE FUSION OF MARGINAL SENSORS FOR ATR AND IFFN APPLICATIONS, |
OCT 1999 |
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| Authors:
DAVID J. MILLER; DAVID L. HALL; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| (U) THIS PAPER DISCUSSES AN APPROACH TO MITIGATE THE EFFECTS OF POOR SENSOR PERFORMANCE BY INTRODUCING WHAT IS REFERRED TO AS AN EXPERT-CRITIC TECHNIQUE. THE CONCEPT INVOLVES THE USE OF SO-CALLED AUTOMATED CRITICS TO MONITOR INDIVIDUAL SENSOR PERFORMANCE TO DETERMINE WHEN A SENSOR OR INFORMATION SOURCE IS LIKELY OR NOT TO BE RELIABLE. SENSOR DATA ARE COMBINED USING EITHER HARD OR SOFT VOTING TECHNIQUES MODULATED BY THE CRITICS WHICH CENSOR ... |
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| INVESTIGATION ON THE USAGE OF AIRCOUPLED ULTRASONIC TRANSDUCERS, |
MAR 1999 |
|
| Authors:
H. M. Tavossi; B. R. Tittmann; M. BHADWAJ; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| (U) THIS PAPER DISCUSSES AN INVESTIGATION OF SPECIALLY DESIGNED AIRCOUPLED TRANSDUCERS WITH ELECTRONIC SIGNAL PROCESSING TO GENERATE AIRBORNE ULTRASONIC PULSES FOR NONCONTACT, NONDESTRUCTIVE CHARACTERIZATION OF MATERIALS. EXAMPLES OF THESE CASES ARE WHERE ULTRASONIC SENSORS ARE USED ON VEHICLES IN MOTION AND WHERE THE MATERIAL IS TOO HOT OR TOO CORROSIVE TO ALLOW THE USE OF ANY CONTACTING SENSORS. SOME RECENT RESULTS ON THE TESTS UNDERTAKEN WITH THE AIRCOUPLED ULTRASONIC SENSORS ... |
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| MODELING OUTDOOR SOUND PROPAGATION WITH MODELED WEATHER DATA, |
MAR 1999 |
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| Authors:
BRIAN MAGILL; DAVID SWANSON; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| (U) THIS PAPER DESCRIBES A METHOD FOR OBTAINING THE ATMOSPHERIC AND ENVIRONMENTAL DATA NECESSARY FOR ACCURATE OUTDOOR SOUND PROPAGATION MODELING FROM DATABASES AVAILABLE ON THE WORLD WIDE WEB. ACCORDING TO THE AUTHORS, IN ORDER TO ACHIEVE REASONABLE RESULTS, OUTDOOR SOUND PROPAGATION MODELING REQUIRES ACCURATE WIND AND TEMPERATURE PROFILES TO A HEIGHT EQUAL TO AT LEAST 1/10 THE PROPAGATION DISTANCE OF INTEREST. IN PAST MEASUREMENTS THESE PROFILES HAVE BEEN OBTAINED FROM ... |
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| ACOUSTIC PROPAGATION, PREDICTION, VALIDATION, AND TRAINING MODELS, |
MAR 1999 |
|
| Authors:
D. C. SWANSON; K. T. MCCLINTIC; M. P. MAHON; K. M. REICHARD; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| (U) THIS PAPER ADDRESSES LARGE VOLUMES OF PRECOMPUTED SOUND TRANSMISSION LOSS TABLES FOR UPWIND, DOWNWIND, AND CROSSWIND WEATHER CONDITIONS, AND FOR VARIOUS GROUND IMPEDANCES, TO SHOW HOW A USER CAN SELECT A SOURCE SIGNATURE AND APPROPRIATE BACKGROUND NOISE TO DETERMINE THE RANGE CONTOUR WHERE A SOURCE IS DETECTABLE. BASELINE DETECTION IS MODELED USING A 1 HZ RESOLUTION SPECTRUM AND A FIGURE OF MERIT CURVE IS USED TO MODEL BETTER OR ... |
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| ENVIRONMENTAL SENSORS FOR ACOUSTIC MONITORING, |
MAR 1999 |
|
| Authors:
KARL REICHARD; JASON ESTEP; DAVID SWANSON; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| (U) THIS PAPER DESCRIBES THE DESIGN AND OPERATION OF REMOTE, WIRELESS, INTELLIGENT ENVIRONMENTAL AND ACOUSTIC SENSORS, CITING THE EFFECTIVENESS OF PASSIVE ACOUSTIC SENSORS FOR DETECTING AND CLASSIFYING GROUND TARGETS GOVERNED BY LOCAL AND REGIONAL WEATHER CONDITIONS SUCH AS WIND AND TEMPERATURE. IT DISCUSSES GROUND SENSOR NODES CAPABLE OF MEASURING TEMPERATURE, TEMPERATURE GRADIENT, HUMIDITY, BAROMETRIC PRESSURE, WIND SPEED AND DIRECTION, AND INSOLATION. THE SENSOR NODES INCLUDE AUTOMATIC DATA LOGGING AND WIRELESS ... |
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| RESOLUTION OF MULTIPATH OUTDOOR SOUND PROPAGATION USING SPREAD-SPECTRUM SIGNALS, |
MAR 1999 |
|
| Authors:
T. DOUGLS MAST; DAVID C. SWANSON; MARK P. MAHON; DAVID E. NORRIS; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| (U) THIS PAPER PRESENTS A METHOD FOR MEASUREMENT OF MULTIPATH ACOUSTIC PROPAGATION APPLIED TO OUTDOOR SOUND PROPAGATION. THE METHOD EMPLOYS SPREAD SPECTRUM SIGNALS IN WHICH A LOW FREQUENCY SINUSOIDAL CARRIER IS BI-PHASE MODULATED BY A PSEUDORANDOM MAXIMAL-LENGTH SEQUENCE. THIS METHOD HAS BEEN TESTED IN AN OUTDOOR SOUND PROPAGATION EXPERIMENT IN THE PRESENCE OF ATMOSPHERIC TURBULENCE. MULTIPLE SPREAD SPECTRUM SIGNALS WERE TRANSMITTED FROM A LOUDSPEAKER AND RECEIVED BY A THREE AXIS ... |
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| Technology Transfer for Economic Competitiveness: A Partnership of Industry, University, and Government |
1998 |
46 pages |
| Authors:
PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| The Applied Research Laboratory is a cost-effective, diversified, project-oriented research facility. As the largest of the affiliated laboratories, centers, and institutes that make up the University's Intercollege Research Programs, ARL draws on the intellectual, economic development, and technology transfer resources of Penn State. Ours is a client-focused R&D environment serving large and small businesses and governmental agencies. Projects can range between both ends of the ... |
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| Wear Particle Analysis Results for Variably Loaded Single Reduction Helical Gearboxes |
1998 |
7 pages |
| Authors:
Terri A. Merdes; Derek C. Lang; James D. Kozlowski; Karen Meister; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| The Mechanical Diagnostic Test Bed (MDTB) was constructed as a multisensor instrumented gear/transmission test stand by the Pennsylvania State University in the area of Condition-Based Maintenance (CBM). The MDTB data acquisition system is capable of recording (using PC-LabWindows) transitional run-to-failure data sets from a variety of commensurate and non-commensurate (vibration, oil, temperature, and acoustic emission) sensors. Off-line JOAP oil analysis results (ferrography) for samples collected from industrial grade (off- the-shelf) ... |
|
| Model-Based Diagnostics of Gas Turbine Engine Lubrication Systems |
1998 |
10 pages |
| Authors:
Carl S. Byington; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| The objective of the current research was to develop improved methodology for diagnosing anomalies and maintaining oil lubrication systems for gas turbine engines. The effort focused on the development of reasoning modules that utilize the existing, inexpensive sensors and are applicable to on-line monitoring within the full-authority digital engine controller (FADEC) of the engine. The target application is the Enhanced TF-40B gas turbine engine that powers the Landing Craft Air ... |
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| ACTIVE EXPLOITATION OF THE ELECTROMAGNETIC ENVIRONMENT FOR IMPROVED TARGET TRACKING AND IDENTIFICATION, |
OCT 1997 |
|
| Authors:
DAVID L. HALL; Robert F. Ogrodnik; PENNSYLVANIA STATE UNIV STATE COLLEGE
|
| (U) THIS PAPER EXTENDS TO A MORE ADAPTIVE AND INTELLIGENT WAY, AN APPROACH TO IMPROVE TARGET TRACKING, SITUATION ASSESSMENT, AND THREAT REFINEMENT BY EXPLOITING THE PASSIVE ELECTROMAGNETIC ENVIRONMENT IN A WAY TO USE PASSIVE RADIO FREQUENCY SENSORS TO OBSERVE A TARGET BY UTILIZING THE ENVIRONMENT OF COMMERCIAL RADIO TRANSMITTERS, SURVEILLANCE RADARS, ETC. THE SENSORS ARE DYNAMICALLY TIMED TO IMPROVE TARGET DETECTION AND CHARACTERIZATION BASED ON HYPOTHESIZED OR A PRIORI INFORMATION ... |
|
| A Physics-Based Means of Computing the Flow Around a Maneuvering Underwater Vehicle |
JAN 97 |
312 pages |
| Authors:
W. C. Zierke; D. A. Boger; F. Davoudzadeh; H. McDonald; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| A physics based method is developed that will lead to a means of accurately predicting the forces and moments acting on a maneuvering, self propelled, appended, underwater vehicle and the resulting vehicle motion. This methodology has been developed to replace the traditional correlation based means of predicting the maneuvering characteristics of a submerged vehicle. One primary difference exists between these methods. While the traditional methods use empirical correlations from model ... |
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| PASSIVE EXPLOITATION OF THE ELECTRO-MAGNETIC ENVIRONMENT FOR IMPROVED TARGET TRACKING, SITUATION ASSESSMENT AND THREAT REFINEMENT, |
SEP 1996 |
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| Authors:
DAVID L. HALL; Robert F. Ogrodnik; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| (U) THIS PAPER ADDRESSES THE CAPABILITIES AND PERFORMANCE OF A NONINTRUSIVE, PASSIVE SURVEILLANCE AND IMAGING SENSOR TECHNOLOGY WHICH HAS BEEN APPLIED TO THE DETECTION AND TRACKING OF COVERT, SMALL SIGNAL TARGETS. THE FUSION MODEL IS USED AS A CONTEXTUAL BASIS TO EXPLAIN THE SEQUENCE AND STRUCTURE OF SUPPORT OF THE SYNTHESIS OF A BROAD AREA SURVEILLANCE ARCHITECTURE WHICH DRAWS FROM MULTIFREQUENCY FUSION BASED TECHNOLOGIES AND CAN CREATE A POWERFUL YET ... |
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| Detailing Structural Concrete for Blast Containment |
Aug-1996 |
9 pages |
| Authors:
T Krauthammer; H Nickerson; C Canada; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| Reinforced concrete structures must often be designed to resist short duration, high amplitude, dynamic loads. These loads may arise from a wide range of sources, including industrial or military explosions, vehicle impact, dropped objects, or wave impact on marine structures. The recent terrorist actions against public buildings in London, New York City, Buenos Aires and Oklahoma City caused various combinations of structural damage and casualties, highlighting that designers may need ... |
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| Analysis of Advanced Oxidation Processes in a Hybrid Air Pollution Control System, 1996 |
1996 |
30 pages |
| Authors:
Bradley A. Striebig; J. M. Schneider; T. A. Spaeder; M. R. Mallery; R. J. Heinsohn; F. S. Cannon; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| With the passage of the 1990 Clean Air Act, advanced oxidation processes have gained interest as an alternative for treating a variety of industrial air and waste water streams. These advanced oxidation processes are very attractive when contaminant compositions and concentrations in the air stream vary widely making typical catalytic incineration costly in terms of fuel and potential catalyst fouling. SERDP and the Marine Corps. Logistics Base have sponsored research ... |
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| Numerical Model of Formaldehyde Photo-Oxidation in a Two Dimensional Flow Field Over Cylindrical UV Light Sources |
20 SEP 1995 |
6 pages |
| Authors:
M. R. Mallery; R. J. Heinsohn; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| Passage of the Clean Air Act Amendments by President Bush in 1990 is placing more stringent control on VOC emissions. These emerging regulations are forcing industries to reduce VOC emissions through new manufacturing techniques or through the use of air pollution control equipment. An emerging air pollution control technology is the use of ultraviolet (UV) photochemical and radical oxidation to destroy pollutant VOCs in process gas ... |
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| Greasy Automatons and The Horsey Set: The U.S. Cavalry and Mechanization, 1928 - 1940 |
MAY 95 |
121 pages |
| Authors:
Vincent J. Tedesco III; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| In the 1920s and 1930s, the United States Cavalry confronted fundamental questions about its identity framed within the context of intense branch partisanship and severe manpower and budgetary constraints. While it took prudent steps to maintain as powerful and modern a body of horse cavalry as possible, an intense struggle for the soul of the institution raged. Conservative officers insisted cavalry was the arm that fought on horseback. Pro-mechanization reformers ... |
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| Meterological Effects on Soil Mositure and Crop Yield as Determined From the Soybean Crop Simulator: GLYCIM |
DEC 94 |
79 pages |
| Authors:
Stephen N. Di Rienzo; PENNSYLVANIA STATE UNIV STATE COLLEGE
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| Estimation of near surface soil moisture availability is of great importance to meteorologists and agriculturists. Potential benefits from knowing the soil volumetric water content include healthier crops, savings in water and money, and reduced leaching of hazardous chemicals into groundwater supplies. Many methods of estimating soil moisture have been developed. Devices to measure volumetric water content include tensiometers, porous electrical resistance blocks, neutron scatterers, Time Domain Reflectors (TDRs), and capacitance ... |
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