Boron/aluminum fan blades for SCAR engines

Processing procedures were developed to enhance boron/aluminum bond behavior and foreign object damage (FOD) tolerance. Design and analysis indicated that the J101 Stage 1 fan blade meets the required frequencies without a midspan shroud. The fabricability of full size J101 blades was assessed, while six blades were fabricated and finished machined

Numerical computation of real or complex elliptic integrals

Algorithms for numerical computation of symmetric elliptic integrals of all three kinds are improved in several ways and extended to complex values of the variables (with some restrictions in the case of the integral of the third kind). Numerical check values, consistency checks, and relations to Legendre's integrals and Bulirsch's integrals are included

Energy efficient engine high pressure turbine ceramic shroud support technology report

This work represents the development and fabrication of ceramic HPT (high pressure turbine) shrouds for the Energy Efficient Engine (E3). Details are presented covering the work performed on the ceramic shroud development task of the NASA/GE Energy Efficient Engine (E3) component development program. The task consists of four phases which led to the selection of a ZrO2-BY2O3 ceramic shroud material system, the development of an automated plasma spray process to produce acceptable shroud structures, the fabrication of select shroud systems for evaluation in laboratory, component, and CF6-50 engine testing, and finally, the successful fabrication of ZrO2-8Y2O3/superpeg, engine quality shrouds for the E3 engine

Wildfire and MAMS data from STORMFEST

Early in 1992, NASA participated in an inter-agency field program called STORMFEST. The STORM-Fronts Experiment Systems Test (STORMFEST) was designed to test various systems critical to the success of STORM 1 in a very focused experiment. The field effort focused on winter storms in order to investigate the structure and evolution of fronts and associated mesoscale phenomena in the central United States. This document describes the data collected from two instruments onboard a NASA ER2 aircraft which was deployed out of Ellington Field in Houston, Texas from February 13 through March 15, 1992, in support of this experiment. The two instruments were the Wildfire (a.k.a. the moderate resolution imaging spectrometer-nadir (MODIS-N) Airborne Simulation (MAS)) and the Multispectral Atmospheric Mapping Sensor (MAMS)

Dynamic stall modeling and correlation with experimental data on airfoils and rotors

Two methods for modeling dynamic stall have been developed. The alpha, A, B method generates lift and pitching moments as functions of angle of attack and its first two time derivatives. The coefficients are derived from experimental data for oscillating airfoils. The Time Delay Method generates the coefficients from steady state airfoil characteristics and an associated time delay in stall beyond the steady state stall angle. Correlation with three types of test data shows that the alpha, A, B method is somewhat better for use in predicting helicopter rotor response in forward flight. Correlation with lift and moment hysteresis loops generated for oscillating airfoils was good for both models

Recent Results from the USU Plasma Impedance Probe for the NASA E-Winds Sounding Rocket Campaign

The new plasma impedance probe built by Utah State University was °own on July 1, 2003 as part of a NASA sounding rocket cam- paign to investigate midlatitude plasma layers and neutral winds. The instrument provided measure- ments of absolute and relative electron densities for the mission. The instrumentation technique is brie°y introduced, along with the plasma param- eters that the technique is capable of measuring. Relative electron densities from the DC Langmuir probe for the mission are presented along with a comparison of the relative density data to the ab- solute density provided by the plasma frequency probe

Postpetition Security Interests under the Bankruptcy Code

Section 364(c) and (d) of the Bankruptcy Code provides for the creation of security interests in real and personal property under federal law. In this Article, David Gray Carlson discusses the quality and nature of these federal security interests, their remarkable immunity from reversal on appeal, and the ability of postpetition lenders to obtain preferences over other creditors through cross-collateralization clauses and the like

Modified Plans of Reorganization and the Basic Chapter 13 Bargain

A very large number of chapter 13 plans are confirmed each year. Unlike chapter 11 plans (for non-individuals), these plans may be revised after confirmation. The modification provisions of the Bankruptcy Code, however, give very little guidance as to what constitutes a permissible modification. In contrast, confirmation of the original plan is very carefully governed. This article theorizes that modification must honor the basic chapter 13 bargain. According to this bargain, the debtor is entitled to the bankruptcy estate and the creditors are entitled to net surplus income. The article assesses whether the diffuse and disorganized caselaw of modification adheres to this normative structure. It explains how some of the precedents permit creditors to raid the bankruptcy estate in violation of a debtor\u27s rights. In particular, it argues that, in a modification, a court should not perform again the best interest of the creditors test of Bankruptcy Code 1325(a)(4), nor should bifurcation of secured claims be revisited

Examining Relationships Among Income, Individual And Relationship Distress, And Outcomes In Marriage And Relationship Education For Low-to-moderate Income Married Couples

The current study utilized data from a federally-funded healthy marriage grant to examine pre, post, and three-to-six month follow-up changes in relationship satisfaction (as measured by the Dyadic Adjustment Scale total scores) and individual distress (as measured by the Outcomes Questionnaire 45.2). Additionally, the study evaluated income and dosage as predictors of relationship satisfaction and individual distress change at post-assessment and three-to-six month follow-up. Participants included 220 married individuals with children who completed PREP 7.0 (Prevention Relationship Enhancement Program). A repeated measures, split plot, MANOVA indicated statistically significant improvements in relationship satisfaction and individual distress for participants at post-assessment and three-to-six month follow-up. No significant differences existed in relationship satisfaction and individual distress changes between men and women. Hierarchical multiple regression indicated combined monthly income and dosage (as measured by number of lessons attended) did not predict changes in relationship satisfaction and individual distress at post-assessment and three-to-six month follow-up. However, partner scores accounted for the largest percent of variance in relationship satisfaction change. Discussion of results, implications for research and practice, and study limitations are provided