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An Analytical Vacuum-Assisted Resin Transfer Molding (VARTM) Flow Model
This is a ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD report procured by the Pentagon and made available for public release It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A239683. The abstract provided by the Pentagon follows: A closed form solution for the flow of resin in the vacuum-assisted resin transfer molding (VARTM) process is used extensively for affordable manufacturing of large composite structures. During VARTM processing, a highly permeable distribution medium is incorporated into the preform as a surface layer. During infusion, the resin flows preferentially across the surface, simultaneously through the preform, to a complex flow front. The analytical solution presented here provides insight into the scaling laws governing fill times and resin inlet placement as a function of the properties of the preform, distribution media, and resin. The formulation assumes that the flow is fully developed and is divided into two areas: (1) a saturated region with no cross flow, and (2) a flow front region, which moves with a uniform velocity, where the resin is infiltrating into the preform from the distribution medium. The law of conservation of mass and Darcy's Law for flow through porous media are applied in each region. The resulting equations are nondimensionalized and are solved to yield the flow front shape and the development of the saturated region. It is found that the flow front is parabolic in shape, and the length of the saturated region is proportional to the square root of the time elapsed. The obtained results are compared to data from fill-scale simulation and show good agreement. The solution allows greater insight into the physics process, enables parametric and optimization studies, and can reduce the computational cost of full-scale, three-dimensional (3-D) simulations..
Price: $23.95 [Notify me when price goes down.]


The Sources of Conflict in the Euphrates-Tigris Basin and Its Strategic Consequences in the Middle East
This is a NAVAL POSTGRADUATE SCHOOL MONTEREY CA report procured by the Pentagon and made available for public release It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A054104. The abstract provided by the Pentagon follows: The potential for conflict over water is enormous since freshwater resources are finite, unevenly distributed, and often shared by more then one country. However, given its importance for basic survival, industry, energy production and other fundamental components of society, water can also become a reason for cooperation as parties in water-scarce regions join together to manage this crucial shared resource. The Euphrates-Tigris basin is one of those regions, where equitable and reasonable distribution of water is at the heart of the dispute among the riparian states of Turkey, Syria, and Iraq. In the basin, the disparities among riparian countries are wide and some are already faced with constraints in meeting domestic water demand owing to physical, socio- economic and political factors. This thesis argues that the predominant factor that contributes to the conflict in the Euphrates-Tigris basin is the domestic concerns of each state rather than an overall shortage of water resources. Furthermore, this thesis demonstrates that although the rhetoric about a water war among the riparian states of the Euphrates-Tigris rivers has been popular in the last decade, it seems unlikely that the water conflict will lead to an all- out war..
Price: $28.95 [Notify me when price goes down.]


Management System for Heterogeneous Networks Final Repor. Volume 1: Project Summary and Papers (Part A)
This is a NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF COMPUTER SCIENCE report procured by the Pentagon and made available for public release. It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A832183. The abstract provided by the Pentagon follows: The goal of the MSHN Project was to explore the application of adaptive and heuristic matching and scheduling techniques, and modem distributed security methods, to a distributed heterogeneous resource management system (RMS) which allows system resources to be accessed by both MSHN-controlled and extemal applications. This document provides both a high-level overview of the MSHN technical program and a reference guide to the MSHN research papers constituting Appendix A..
Price: $67.30 [Notify me when price goes down.]


A New Sequential Goodness-Of-Fit-Test for the Three-Parameter Weibull Distribution with Known Shape Parameter Value Based on Skewness and Q-Statis G. O.F. Test Statistics
This is a AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING report procured by the Pentagon and made available for public release It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A497163. The abstract provided by the Pentagon follows: Due to its flexibility, the Weibull distribution has very wide applicability in a lot of disciplines and is very prevalent in reliability theory. Thus, a lot of statistical tests that generally have a substantial degree of computional complexity have been developed to determine if the data at hand can be represented with this distribution. This research presents a new omnibus goodness-of-fit test (G.O.F.) that has less computational complexity than the existing tests for the three-parameter Weibull distribution using a sequential application of two individual tests, sample skewness and Q-Statistic. A Monte Carlo procedure has been employed to generate critical values for the skewness and Q-Statistic (G.O.F.) tests for various Weibull distributions with specified shape parameter values. Additionally, tables or charts of attained significance levels for the new sequential G.O.F. test procedure have been generated. Using the critical values and significance levels, a sequential G.O. F. test procedure can be used to determine if the given sample data agrees with a hypothesized Weibull distribution with known shape. A power study has been conducted against a variety of alternative hypotheses, and the results were compared with those obtained using conventional EDF type Cramer-von Mises, Ahderson-Darling and Kolmogorov-Smimov G.O.F tests, and the sequential procedure by Clough. Since the sequential test demonstrates better or equivalent power, it serves to significantly reduce the computational requirements for powerful G.O. F. testing..
Price: $116.40 [Notify me when price goes down.]


Adaptive Multi-Layer LMS Controller Design and Its Application to Active Vibration Suppression on a Space Truss
This is a NAVAL POSTGRADUATE SCHOOL MONTEREY CA report procured by the Pentagon and made available for public release It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A548293. The abstract provided by the Pentagon follows: This thesis develops an adaptive controller that actively suppresses a single frequency disturbance source at a remote position and tests the system on the NPS Space Truss. The experimental results are then compared to those predicted by an ANSYS finite element model. The NPS space truss is a 3.7-meter long truss that simulates a space- borne appendage with sensitive equipment mounted at its extremities. One of two installed piezoelectric actuators and an Adaptive Multi-Layer LMS control law were used to effectively eliminate an axial component of the vibrations induced by a linear proof mass actuator mounted at one end of the truss. Experimental and analytical results both demonstrate reductions to the level of system noise. Vibration reductions in excess of 50dB were obtained through experimentation and over 100dB using ANSYS, demonstrating the ability to model this system with a finite element model. This thesis also proposes a method to use distributed quartz accelerometers to evaluate the location, direction, and energy of impacts on the NPS space truss using the DSPACE data acquisition and processing system to capture the structural response and compare it to known reference signals..
Price: $41.95 [Notify me when price goes down.]


Transforming Analysis Models into Design Models for the Multiagent Systems Engineering (MASE) Methodology
This is a AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT report procured by the Pentagon and made available for public release It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A129193. The abstract provided by the Pentagon follows: Agent technology has received much attention in the last few years because of the advantages that multiagent systems have in complex, distributed environments. For multiagent systems are to be effective, they must be reliable, robust, and secure. AFIT's Agent Research Group has developed a complete- lifecycle methodology, called Multiagent Systems Engineering (MaSE), for analyzing, designing, and developing heterogeneous multiagent systems. However, developing multiagent systems is a complicated process, and there is no guarantee that the resulting system meets the initial requirements and will operate reliably with the desired behavior. The purpose of this research was to develop a semi-automated formal transformation system for the MaSE methodology, as one part of formal agent synthesis, that derives the system design based on the analysis. Since each transform in the transformation system preserves correctness, the designer can be sure that the resulting system design is correct with respect to the system specification. A secondary goal of this research was to develop a proof-of-concept module for agentTool that implements the transforms..
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Adaptive Multi-Layer LMS Controller Design and Application to Active Vibration Suppression on a Truss and Proposed Impact Analysis Technique
This is a NAVAL POSTGRADUATE SCHOOL MONTEREY CA report procured by the Pentagon and made available for public release It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A280093. The abstract provided by the Pentagon follows: This research develops an adaptive controller that actively suppresses a single frequency disturbance source at a remote position and tests the system on the NPS Space Truss. The experimental results are then compared to those predicted by an ANSYS finite element model. The NPS space truss is a 3.7- meter long truss that simulates a space-borne appendage with sensitive equipment mounted at its extremities. One of two installed piezoelectric actuators and an Adaptive Multi-Layer LMS control law were used to effectively eliminate an axial component of the vibrations induced by a linear proof mass actuator mounted at one end of the truss. Experimental and analytical results both demonstrate reductions to the level of system noise. Vibration reductions in excess of 50dB were obtained through experimentation and over 100dB using ANSYS, demonstrating the ability to model this system with a finite element model. This report also proposes a method to use distributed quartz accelerometers to evaluate the location, direction, and energy of impacts on the NPS space truss using the DSPACE data acquisition and processing system to capture the structural response and compare it to known reference Signals..
Price: $41.95 [Notify me when price goes down.]


Exploration of Fibre Channel as an Avionics Interconnect for the 21st Century Military Aircraft
This is a NAVAL POSTGRADUATE SCHOOL MONTEREY CA report procured by the Pentagon and made available for public release It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A293383. The abstract provided by the Pentagon follows: Avionics architectures are evolving from "Federated" systems consisting of highly specialized black boxes connected together via MIL-STD-1553 and ARINC 429 data buses to "Integrated" and "Distributed" architectures. These new architectures contain high data-rate sensors, parallel processors, and shared memory with high levels of integration. These systems require a new interconnection system that overcomes the limitations of older standards. One such interconnection system is Fibre Channel. This thesis evaluates Fibre Channel as avionics interconnection standard. It begins by defining the requirements and measures of performance for an interconnection system suitable for the new avionics architectures. The requirements address technical performance, affordability, reliability, sustainability, and maintainability considerations. The Fibre Channel standards are then compared to the requirements for the avionics interconnection system. In order to perform a technical performance evaluation of a switched fabric avionics interconnection system, a computer simulation model was developed. The OPNET Modeler% tool from OPNET, Inc. was used to model the components of an advanced avionics system. The results of this simulation demonstrated that Fibre Channel meets all the performance requirements of an avionics interconnect..
Price: $34.95 [Notify me when price goes down.]


Automating Aviation Training Records
This is a NAVAL POSTGRADUATE SCHOOL MONTEREY CA report procured by the Pentagon and made available for public release. It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A963483. The abstract provided by the Pentagon follows: Over the years with advances in computer technology, the navy has gradually transitioned into a paperless operation. Personnel training records have provided a standardized, documentable individual qualification record for Navy aviation maintenance personnel, however these records continue to be kept in folders, stored in file cabinets. In addition, paper records create a maintenance burden, in that the continued handling and possibility of errors made during data entry and normal wear and tear of documents contained in these records, require pages to be periodically repaired, replaced or completely recreated. A torn and missing page also causes valuable training information to become lost, decreasing the information integrity of the record. This thesis will examine the benefits and problems in automating aviation training records, and further discuss database design issues and considerations to maximize the flexibility and functionality provided by automation. Incorporating a distributed database is discussed as a solution, with further discussion on further considerations for the proper implementation of a training record database..
Price: $26.95 [Notify me when price goes down.]


Scheduling and Prototyping of Distributed Real Time Systems (An Approach Using Jini/JaveSpaces)
This is a NAVAL POSTGRADUATE SCHOOL MONTEREY CA report procured by the Pentagon and made available for public release. It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A832604. The abstract provided by the Pentagon follows: The major difference between single and distributed processors scheduling is that, in addition to deciding which order to execute tasks, distributed processors' scheduling algorithms must also decide which processor the task should run on. Moreover, these algorithms must also take into consideration practical network issues like transmission delay, loss of messages, and synchronization in the absence of a global clock. This thesis proposes a formal model to capture these network constraints and develops a proxy-based network buffer technique to support the inter-process communication for the user-defined distributed real-time systems prototypes generated by the Distributed Computer Aided Prototyping System (DCAPS). The proxy-based technique builds on the Jini/JavaSpaces infrastructure. We have conducted several experiments to measure the response time of inter-process communication via JavaSpaces. We have demonstrated the effectiveness of the proxy-based technique by creating an executable prototype of a user-defined distributed real-time system specification..
Price: $44.95 [Notify me when price goes down.]


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