Effect of time dependent flight loads on JT9D-7 performance deterioration

The results of a modal transient analysis of the engine/aircraft system are presented. The response of the JT9D to analytically simulated vertical gusts and landings was predicted using a NASTRAN finite element mathematical model of the JT9D/747 propulsion system. The NASTRAN finite element model of the propulsion system included engine structural models of the fan, low/high pressure compressors, diffuser/turbine cases, and high/low pressure rotors, as well as nacelle models of the inlet cowl, tailcone, and wing pylon. The analysis conducted predicts that an insignificant level of JT9D-7 performance deterioration would occur due to a typical vertical gust encounter or a typical revenue service landing. Analysis of a high sink rate landing with a heavy fuel load indicates the possibility of local wear, however, the lack of an accurate dynamic rotor/seal interference model precludes an accurate quantitative evaluation of performance change for this once-per-airframe-life event

Editorial: Creating the environment for a healthy South Sudan

No Abstrac

Jay Carlton Srygley and G. Wade Lewis in a Joint Senior Recital

This is the program for the joint recital of baritone Jay Carlton Srygley and tenor G. Wade Lewis. Mr. Srygley and Mr. Lewis were accompanied on the piano by Steven Cole. This recital took place on April 18, 1994, in the McBeth Recital Hall in the Mabee Fine Arts Center

The Ursinus Weekly, April 21, 1958

YM-YWCA, WAA, WSGA elections held Tues., April 22 • Fernbrook site of Spring YM-YW retreat, May 2-4 • Spring concert given Thursday • Business staff picked for 1959 yearbook • Women\u27s Club invites senior women to dessert • She stoops to conquer given by Curtain Club, May 8, 9, 10th • L. Lanin featured at inter-frat weekend • MSGA petitions begin circulation today till May 4 • Final forum on art given April 14 • Editorial: Cadaverism • Road to war • Baseball prayer • Educationalistic personnel • Men\u27s tennis team opens season; F&M opponent • Haverford humiliates UC as cindermen lose meet • Lacrosse squad smashes Garnet • Bear nine blast Drexel; Walks lead to defeat by Hens • Southern opposition succumbs to Ursinus • Middle Atlantic Conference announces football setup • Ursinus may not enter Penn Relays this weekend • Great variety shown in March\u27s Library accessions • Mental health week April 27 to May 5https://digitalcommons.ursinus.edu/weekly/1405/thumbnail.jp

CPA elderCare/primePlus services : a practitioner\u27s resource guide;

CD-ROM files converted to PDF and included after main texthttps://egrove.olemiss.edu/aicpa_guides/1105/thumbnail.jp

An Environmentally Friendly Conductive Ink Made Using Transgenic Spider Silk Protein and Silver Salts

The goal of this study was to demonstrate that it is possible to formulate an electrically conductive, stretchable and environmentally friendly ink or coating. This is made possible by harnessing the properties of biomimetic spider silk obtained from transgenic goats. In this experiment we formulated four inks using spider silk, silver trifluoroacetate and carbon nanotubes (CNT). We utilized Polyethylene terephthalate (PET), spider silk, natural rubber (Latex) and polystyrene-block-isobutylene-block-styrene(SIS) as substrates to demonstrate the flexible nature of the ink/coating. We then conducted surface characterization using FTIR and SEM to verify the presence of our coating and quantified the thickness of our coatings. We measured the conductivity of the ink using an Ohm meter. Our preliminary results indicate successful formulation of an ink that meets the parameters described above. Inks formulated using spider silk and AgTFA are in fact more stable and conductive than other inks tested in this experiment. We also found little or no success with the other three inks described in the experiment. This study serves as a proof of concept and starting point for optimization of such inks for use in the bio medical and technology sectors

Characterization of Automotive Paint Clear Coats by Ultraviolet Absorption Microspectrophotometry with Subsequent Chemometric Analysis

Clear coats have been a staple in automobile paints for almost thirty years and are of forensic interest when comparing transferred and native paints. However, the ultraviolet (UV) absorbers in these paint layers are not typically characterized using UV microspectrophotometry, nor are the results studied using multivariate statistical methods. In this study, measurements were carried out by UV microspectrophotometry on 71 samples from American and Australian automobiles, with subsequent chemometric analysis of the absorbance spectra. Sample preparation proved to be vital in obtaining accurate absorbance spectra and a method involving peeling the clear coat layer and not using a mounting medium was preferred. Agglomerative hierarchical clustering indicated three main groups of spectra, corresponding to spectra with one, two, and three maxima. Principal components analysis confirmed this clustering and the factor loadings indicated that a substantial proportion of the variance in the data set originated from specific spectral regions (230–265 nm, 275–285 nm, and 300–370 nm). The three classes were well differentiated using discriminant analysis, where the cross-validation accuracy was 91.6% and the external validation accuracy was 81.1%. However, results showed no correlation between the make, model, and year of the automobiles