International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, California / Remote, high speed, high explosive wave front monitoring requires very high bandwidth telemetry to allow transmission of diagnostic data before the explosion destroys the sensor system itself. The main motivation for this study is that no known existing implementation of this sort has been applied to realistic weapons environments. These facts have prompted the research and gathering of data that can be used to extrapolate towards finding the best modulation method for this application. In addition to research of similar existing analysis and testing operations, data was recently captured from a Joint Test Assembly (JTA) Air Launched Cruise Missile (ALCM) flight.

International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California / This paper uses ARTM channel sounding data collected at Edwards Air Force Base to investigate the dependency between the characteristics of frequency selective multipath fading and carrier frequency and ground based received antenna diameter. Channel model parameters are obtained from data sets measured at different frequencies and various ground based antenna diameters. The analysis shows that the multipath characteristics do not statistically change between the L-band and S-band carrier frequencies, but do change with antenna diameter. Furthermore, Flight 18 data shows that antenna diversity may be a useful technique to reduce data loss from multipath fading.

With aggressive technology scaling, within-die random variations are becoming the most dominant source of process variations. Gate-level statistical static timing is becoming a widely accepted approach as an alternative to static timing analysis. However, statistical timing approaches lack good models for handling timing variations due to within-die random variations. Before performing statistical timing analysis on a design or System On Chip (SoC), the cells in the library are pre-characterized for delay as well as constraints due to these random variations. This is referred to as statistical characterization of the cells. The major contribution of this dissertation is the development of novel techniques for statistical characterization and optimization of cells. The methods couple the knowledge of circuits along with the significant factor analysis methods to compute the sensitivities, to perform statistical timing and to perform sensitivity-aware cell optimizations. The first contribution of this dissertation is a statistical delay characterization method developed for computing delay sensitivities of standard cells considering both global and mismatch process variations. In addition to the cells being characterized for delay, the sequential cells are characterized for timing constraints like setup and hold time constraints. The second contribution of this dissertation addresses the problem of constraint sensitivity characterization in sequential cells. Block-based statistical timing approaches lack accurate consideration of the impact of slew variations on both delay and arrival time variations. Specifically, the delay variations due to within-die random variables (mismatch variables) result in a slew-based correlation during timing propagation. Handling within-die random variations more accurately during statistical timing propagation is the topic of the third contribution of this dissertation. Clock networks are more prone to these within-die random variations and can result in significant clock-skew variations. In the fourth contribution, a timing margining methodology is presented that accurately accounts for the clock skew variations in a timing sign-off flow. Typically, the standard cells are designed very early in the design cycle and long before the process reaches production maturity. Any subtle improvements to reduce variability in standard cells can improve parametric yield significantly. Statistical characterization of cells for timing provides a key baseline for understanding the circuit behavior due to different sources of variation. The sensitivity information can also help increase yield by reducing the variability during the circuit design itself. The final contribution in the dissertation addresses this by defining key cell and device criticality metrics. A sensitivity-aware standard cell layout optimization is demonstrated using the proposed criticality metrics. / text

Abdominal aortic aneurysm (AAA) occurs in developed nations. The current treatment, endovascular aneurysm repair (EVAR), while successful, has shortcomings. A solution to the concerns with EVAR is a polymeric endo-aortic paving (PEAP). Our goal is to further develop this treatment for AAA. We hypothesize that PEAP will overcome the current limitations associated with current AAA repair, while maintaining the desirable qualities of these materials are biocompatibility, thermoformability, and material compliance with aortic tissue. The purpose of this work was to evaluate potential PEAP material candidates, which include acrylate-based shape memory polymers (SMPs), polycaprolactone (PCL) and polyurethane (PU) blends, and finally a PCL-based bioresorbable copolymer poly (ester-urethane-urea) (PEUU). Materials were assessed by characterization of their chemical, thermomechanical and degradation properties. It was determined that acrylate- SMPs were too stiff to be candidates for use in PEAP. The control of the PEUU copolymer composition yielded a material that had increased degradability while maintaining valuable characteristics of the PCL/PU blend prior to, during, and following degradation. The difference between the PU hydrophobicity dictated MTM sensitivity to water immersion and degradation characteristics. Conventional statistics were used to develop three models for predicting key properties of PEUU. Important variables, such as PCL M(n), temperature, and crystallinity were found to impact both copolymer microstructure and mechanical properties.

The synthesis of polyesters and copolyesters containing the bicycl o[2. 2.2]octane ring and 1,4-cycl ohexanedi acetic acid and 1,4-cyclohexanedimethanol spacers are discussed. The following homopolyesters were synthesized: poly[oxy(2-methyll, 4-phenylene)oxycarbonyl-l,4-bicyclo[2.2.2]octylenecarbonyl] I; and poly[oxy(2-chloro-l,4-phenylene)oxycarbonyl-l,4-bicyclo[2.2.2]octy-1 enecarbonyl] II. The following copolyesters were synthesized: poly[oxy (2-chl oro- 1,4-phenyl ene )oxycarbonyl-l ,4-bi cycl o[2. 2. 2]octyl enecarbonyl-co-oxy- (2-chloro-1,4-phenylene)oxysebacoyl] III; poly[oxy(2-methyl-l,4- phenylene)oxycarbonyl-l,4-bicyclo[2.2.2]octylene-co-oxy(2-methyl-l,4- phenyl ene)oxysebacoyl] IV; poly[oxy(2-methyl-l,4-phenylene)oxyterephthaloyl- co-oxy(2-methyl-l,4-phenylene)oxy-l,4-cyclohexanediacetoyl] V; poly[oxy(2-methyl-1,4-phenylene)oxyterephthaloyl-co-oxymethylene-1,4 cyclohexylenemethyleneoxyterephthaloyl] VI; and poly[oxy(2-chloro-1,4 phenylene)oxyterephthaloyl-co-oxymethylene-1,4 cyclohexylenemethyleneoxyterephthaloyl]VII. The resulting homopolyesters and copolyesters were characterized by proton NMR, DSC, TGA, IR, solution viscosity, and polarizing optical microscopy.

The experimental determination of dynamic characteristics of elastic structures, in particularof space flight related structures typically is performed by experimental modal analysis(EMA) or output-only modal analysis (OMA). This document is focused on the OMA methodsand state-space modelling, the motivation for this approach is the possibility to monitorthe real loading of a structure in order to provide a loading history which may be used foran assessment of safe remaining life once the dynamic characteristics has been determined. Previous work has demonstrated that Extened Kalman Filter is not sufficient in thecase when the forces are unkown and the only resource available are the responses of thestructure. In this research a new method called Unscented Kalman Filter is investigated andimplemented, proving its capability to obtain a better approximation of the elastic structurebehaviour and a correction of the modal parameters.

The purpose of this research has been to explore the native monorhamnolipid (mRL) mixture produced by Pseudomonas aeruginosa ATCC 9027, as well as newly- synthesized monorhamnolipid diastereomers (R,R)-Rha-C10-C10, (R,S)-Rha-C10-C10, (S,S)-Rha-C10-C10 and (S,R)-Rha-C10-C10, to understand their aggregation and phase behavior in aqueous solution. This work is in response to the consideration that biosurfactants offer a "greener" alternative to conventional surfactants. Relationships between chemical structure of the diastereomers and surface activity were studied using surface tension measurements. It was found that the critical aggregation concentration (CAC) values are lower for deprotonated (R,S)-Rha-C10-C10 and higher for protonated (R,S)-Rha-C10-C10 compared to the other diastereomers or the native mRL mixture. Furthermore, the 1:1:1:1 diastereomeric mixture has the overall lowest cross-sectional area for deprotonated rhamnolipids. Dynamic light scattering (DLS) was used to study the hydrodynamic radii (Rh) of the mRL aggregates and the four diastereomers in aqueous solution. In all five surfactants studied, each observed at pH 8.0 and 4.0, three aggregate populations were observed. For all deprotonated rhamnolipids the micelle, at a hydrodynamic radius of ~2 nm, was found to be in the highest abundance where the two lower abundant other population take on a lamellar aggregate structure. Data to support this were collected using fluorescence probing techniques. For the surfactants in the protonated state, pH 4.0, it was found that all form primarily lamellar structures, also confirmed using fluorescence probing. The average aggregation numbers (Nagg) of the micelles for the deprotonated native mRL mixture and the four diastereomers were studied using steady-state and time-resolved fluorescence quenching measurements. Somewhat unexpectedly, the Nagg values were observed to be a strong function of the rhamnolipid concentration for all systems. At low concentrations, pre-micellar aggregates with aggregation numbers too small for micelles were observed. A critical concentration is identified at which a critical aggregation number is defined; this is proposed to be the smallest fully-formed micelle in solution with values of ~25-30 molecules/micelle for the native mRL mixture and all four diastereomers. Thus, the aggregation properties of the native mRL mixture and the four diastereomers are generally similar at this critical concentration. However, the increase in aggregation number above this critical point varies for all the surfactants, where the (R,R)-Rha-C10-C10 diastereomer has the greatest increase in monomers with concentration and the (S,S) and (R,S) diastereomers have the lowest. The increased observed aggregation number is consistent with the computational work showing increased growth with concentration for the deprotonated rhamnolipid micelles. Furthermore, these computations have confirmed the ability of protonated rhamnolipids to form lamellar structures in solution. Fluorescence probing work was also used to study rhamnolipid phase behavior as a function of varying solution conditions, such as ionic strength, solution pH, surfactant concentration, and temperature. Steady-state fluorescence methods are utilized to probe the surfactant microenvironment using the polarity-sensitive dyes prodan and laurdan. By dissolving the dye within the rhamnolipid aggregates and observing their solvatochromic behavior, all surfactants studied are known to form more micellar aggregates at high pH and low surfactant concentration, whereas elongation of the micelle is observed at low pH and moderate to high surfactant concentration.

This study is limited largely to teachers in the public or common schools, although a few academy and female seminary teachers and at least one governess are included. It is not a definitive study, but a sufficient number of writings have been examined to make a fair sampling of the range of the nineteenth century American fiction.

Electrocardiography (ECG) monitor is a medical device for recording the electrical activities of the heart using electrodes placed on the body. There are many ECG monitors in the market but it is essential to find the accuracy with which they generate results. Accuracy depends on the processing of the ECG signal which contains several noises and the algorithms used for detecting peaks. Based on these peaks the abnormality in the functioning of the heart can be estimated. Hence this thesis characterizes the ECG signal which helps to detect the abnormalities and determine the accuracy of the system.

This paper focuses on Mark Twain's writing style and characterization in his fiction. The settings and characters of his fiction are in particular focus, specifically how Mark Twain draws on personal experiences and memories to make his characters and settings more relatable and realistic. A brief biography of Twain's life is given before the author goes into the specifics of characterization and settings.