Estimating short-period dynamics using an extended Kalman filter

An extended Kalman filter (EKF) is used to estimate the parameters of a low-order model from aircraft transient response data. The low-order model is a state space model derived from the short-period approximation of the longitudinal aircraft dynamics. The model corresponds to the pitch rate to stick force transfer function currently used in flying qualities analysis. Because of the model chosen, handling qualities information is also obtained. The parameters are estimated from flight data as well as from a six-degree-of-freedom, nonlinear simulation of the aircraft. These two estimates are then compared and the discrepancies noted. The low-order model is able to satisfactorily match both flight data and simulation data from a high-order computer simulation. The parameters obtained from the EKF analysis of flight data are compared to those obtained using frequency response analysis of the flight data. Time delays and damping ratios are compared and are in agreement. This technique demonstrates the potential to determine, in near real time, the extent of differences between computer models and the actual aircraft. Precise knowledge of these differences can help to determine the flying qualities of a test aircraft and lead to more efficient envelope expansion

Aural Ethnography and the Notion of Membership: An Exploration of Listening Culture in Havana

Havana has a distinct aural culture. Its soundscapes are dynamic, and are spaces createdwith intention and purpose through the act of soundmaking. Locals actively engage theirsurroundings, and they demonstrate a willingness to contribute to the composition of theacoustic environment. The result is a soundscape that is rich in communicative potential,offering the individual a sense of being present within a familiar community – one thathas intimate ties to the physical terrain on which it is situated. But what is it exactly thatcreates the conditions for such a dynamic aural experience? And what is it about theHavana soundscape that sets it apart from the sounds of any other urban environment? Many of the sonic impressions that are used to inform this analysis are living artifacts of my own memory,and have not been derived from any recent ethnographic fieldwork. In this sense, thispaper is an instance of placing the cart before the horse, and is in some ways more of aproject proposal than it is a finalized collection of thoughts. With this in mind, I will domy best to convey with the utmost clarity and brevity what it is I hope to accomplishduring my tenure as a doctoral student, and why aural ethnography, in particular as itpertains to culture in Havana, is something that is worth pursuing

How Do Culturally Responsive School Counselors Make Meaning of the Challenges They Face in Meeting the Needs of a Diverse Student Population and Enact Effective Practices?

The purpose of this study was to investigate how school counselors who are culturally responsive make meaning of their practices and the challenges faced in meeting the needs of a diverse population. Specifically, my study concentrated on examining real life experiences/practices that resulted in a rich explanation of the phenomenon studied. Hearing the voices of school counselors describing their practices and experiences in providing culturally responsive counseling services contributed to better understanding of the strategies, programs, and actions that define culturally response counseling. This dissertation includes an overview of the study, a review of the pertinent literature, a detailed description of the study’s methodology, an analysis of the findings, and a discussion about the implications for the school counseling field

Environmental influence on predisposing genes for holoprosencephaly in monochorionic diamniotic twins

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1997 NASA Academy in Aeronautics

The NASA Academy in Aeronautics at the Dryden Flight Research Center (DFRC) was a ten-week summer leadership training program conducted for the first time in the summer of 1997. Funding was provided by a contract between DFRC and Purdue University. Mr. Lee Duke of DFRC was the contract monitor, and Professor Dominick Andrisani was the principal investigator. Five student research associates participated in the program. Biographies of the research associates are given in Appendix 1. Dominick Andrisani served as Dean of the NASA Academy in Aeronautics. NASA Academy in Aeronautics is a unique summer institute of higher learning that endeavors to provide insight into all of the elements that make NASA aeronautical research possible. At the same time the Academy assigns the research associate to be mentored by one of NASA!s best researchers so that they can contribute towards an active flight research program. Aeronautical research and development are an investment in the future, and NASA Academy is an investment in aeronautical leaders of the future. The Academy was run by the Indiana Space Grant Consortium at Purdue in strategic partnership with the National Space Grant College and Fellowship Program. Research associates at the Academy were selected with help from the Space Grant Consortium that sponsored the research associate. Research associate stipend and travel to DFRC were paid by the students' Space Grant Consortium. All other student expenses were paid by the Academy. Since the Academy at DFRC had only five students the opportunity for individual growth and attention was unique in the country. About 30% of the working time and most of the social time of the students were be spent as a "group" or "team." This time was devoted to exchange of ideas, on forays into the highest levels of decision making, and in executing aeronautical research. This was done by interviewing leaders throughout the aerospace industry, seminars, working dinners, and informal discussions. The other 70% of the working time was spent working on the technical research project with the engineering mentors. Abstracts of those projects are given in Appendix 4

The Total In-Flight Simulator (TIFS) aerodynamics and systems: Description and analysis

The aerodynamics, control system, instrumentation complement and recording system of the USAF Total In/Flight Simulator (TIFS) airplane are described. A control system that would allow the ailerons to be operated collectively, as well as, differentially to entrance the ability of the vehicle to perform the dual function of maneuver load control and gust alleviation is emphasized. Mathematical prediction of the rigid body and the flexible equations of longitudinal motion using the level 2.01 FLEXSTAB program are included along with a definition of the vehicle geometry, the mass and stiffness distribution, the calculated mode frequencies and mode shapes, and the resulting aerodynamic equations of motion of the flexible vehicle. A complete description of the control and instrumentation system of the aircraft is presented, including analysis, ground test and flight data comparisons of the performance and bandwidth of the aerodynamic surface servos. Proposed modification for improved performance of the servos are also presented

ANALISIS PENGARUH JUMLAH PENDUDUK DAN UPAH TERHADAP PENAWARAN TENAGA KERJA DI INDONESIA

Penelitian ini bertujuan untuk mengetahui pengaruh jumlah penduduk dan upah terhadap penawaran tenaga kerja di Indonesia. Penelitian ini menggunakan data cross section tahun 2017 di 34provinsi di Indonesia. Analisis ini menggunakan metode Ordinary Least Square (OLS). Hasil penelitian diperoleh bahwa: (1) jumlah penduduk mempunyai pengaruh positif dan signifikan terhadap penawaran tenaga kerja di Indonesia. (2) upah mempunyai pengaruh negative dan tidak signifikan terhadap penawaran tenaga kerja di Indonesia. Secara bersama- sama jumlah penduduk dan upah mempunyai pengaruh yang signifikan terhadap penawaran tenaga kerja di Indonesia

Markov processes and generalized Schroedinger equations

Starting from the forward and backward infinitesimal generators of bilateral, time-homogeneous Markov processes, the self-adjoint Hamiltonians of the generalized Schroedinger equations are first introduced by means of suitable Doob transformations. Then, by broadening with the aid of the Dirichlet forms the results of the Nelson stochastic mechanics, we prove that it is possible to associate bilateral, and time-homogeneous Markov processes to the wave functions stationary solutions of our generalized Schroedinger equations. Particular attention is then paid to the special case of the Levy-Schroedinger equations and to their associated Levy-type Markov processes, and to a few examples of Cauchy background noise

Dumas Relationships Applied to Two Italian Sites. A Comparison among Various Solar Energy Estimating Formulas

Abstract In this paper different methods for a predictive estimation of solar radiation are compard. The timeframe is 2007-2009. The comparison has been made on two sites, Manfredonia and Portici, both located in the south of Italy. Even if these sites are relatively near and subjected to a temperate climate, typical of Mediterranean region, they present some important differences in local micro- climate, which affects atmospheric behavior, particularly in the daily temperature variations. The method for estimating solar radiation proposed by Dumas (1984) has been tested and compared with various solar radiation empirical formulas, correlating solar radiation energy with temperature, as the well known Bristow-Campbell and Hardgreaves-Samani models. This preliminary study shows the potential of the Dumas method, even in the tested locations. It also shows that the Dumas relation actually performs better then the models mentioned above, in particular for sites with low values of daily temperature variations. In some cases it even offers a comparable accuracy with respect to the Angstrom-Prescott formula