NSEG: A segmented mission analysis program for low and high speed aircraft. Volume 3: Demonstration problems

Program NSEG is a rapid mission analysis code based on the use of approximate flight path equations of motion. Equation form varies with the segment type, for example, accelerations, climbs, cruises, descents, and decelerations. Realistic and detailed vehicle characteristics are specified in tabular form. In addition to its mission performance calculation capabilities, the code also contains extensive flight envelope performance mapping capabilities. For example, rate-of-climb, turn rates, and energy maneuverability parameter values may be mapped in the Mach-altitude plane. Approximate take off and landing analyses are also performed. At high speeds, centrifugal lift effects are accounted for. Extensive turbojet and ramjet engine scaling procedures are incorporated in the code

NSEG, a segmented mission analysis program for low and high speed aircraft. Volume 1: Theoretical development

A rapid mission analysis code based on the use of approximate flight path equations of motion is presented. Equation form varies with the segment type, for example, accelerations, climbs, cruises, descents, and decelerations. Realistic and detailed characteristics were specified in tabular form. The code also contains extensive flight envelope performance mapping capabilities. Approximate take off and landing analyses were performed. At high speeds, centrifugal lift effects were accounted for. Extensive turbojet and ramjet engine scaling procedures were incorporated in the code

NSEG: A segmented mission analysis program for low and high speed aircraft. Volume 2: Program users manual

A rapid mission analysis code based on the use of approximate flight path equations of motion is described. Equation form varies with the segment type, for example, accelerations, climbs, cruises, descents, and decelerations. Realistic and detailed vehicle characteristics are specified in tabular form. In addition to its mission performance calculation capabilities, the code also contains extensive flight envelop performance mapping capabilities. Approximate take off and landing analyses can be performed. At high speeds, centrifugal lift effects are taken into account. Extensive turbojet and ramjet engine scaling procedures are incorporated in the code

High Reynolds Number Test of the Boeing TR77 Airfoil in the Langley 0.3-Meter Transonic Cryogenic Tunnel

A Boeing TR77 airfoil associated with the Advanced Technology Airfoil Test (ATAT) program was tested in the Langley 0.3 m Transonic Cryogenic Tunnel. Limited analysis of the data indicated that increasing Reynolds number for a fixed Mach number resulted in increased normal-force, nose-down pitching moment, and decreased drag coefficient. Increasing Mach number while keeping the Reynolds number constant yielded the expected increase in normal-force slopes, nose-down pitching moment coefficients, and decrease in angle of attack associated with maximum normal-force coefficient. Turbulent boundary layer flow was achieved over the airfoil at low Reynolds numbers for the test Mach number range using aluminum discs

High Reynolds number tests of a Boeing BAC I airfoil in the Langley 0.3-meter transonic cryogenic tunnel

A wind tunnel investigation of an advanced-technology airfoil was conducted in the Langley 0.3-Meter Transonic Cryogenic Tunnel (TCT). This investigation represents the first in a series of NASA/U.X. industry two dimensional airfoil studies to be completed in the Advanced Technology Airfoil Test program. Test temperature was varied from ambient to about 100 K at pressures ranging from about 1.2 to 6.0 atm. Mach number was varied from about 0.40 to 0.80. These variables provided a Reynolds number (based on airfoil chord) range from about .0000044 to .00005. This investigation was specifically designed to: (1) test a Boeing advanced airfoil from low to flight-equivalent Reynolds numbers; (2) provide the industry participant (Boeing) with experience in cryogenic wind-tunnel model design and testing techniques; and (3) demonstrate the suitability of the 0.3-m TCT as an airfoil test facility. All the objectives of the cooperative test were met. Data are included which demonstrate the effects of fixed transition, Mach number, and Reynolds number on the aerodynamic characteristics of the airfoil. Also included are remarks on the model design, the model structural integrity, and the overall test experience

Estimating sex from the seven cervical vertebrae : an analysis of White European skeletal populations

xv, 244 leaves : col. ill. ; 29 cm.Includes abstract and appendices.Includes bibliographical references (leaves 177-194).The current study focused on the seven cervical vertebrae to establish an accurate sex estimation method for White European skeletal populations. The influences of stature and aging on the cervical vertebrae were also investigated to assess their effects on estimating sex from the cervical vertebrae. Three characteristics from the seven cervical vertebrae were measured (CHT, maximum body height; CAP, vertebral foramen anterior-posterior diameter; and CTR, vertebral foramen transverse diameter). Two hundred and ninety five individuals (157 males, 138 females), ranging from 20 to 99 years old were studied from the contemporary University of Athens and the historic Luis Lopes Skeletal Collections. To date, no study has used the combination of cervical vertebral foramen measurements and the vertebral body height to estimate sex. Intra- and inter-observer error rates were low, with the exception of C1TR. The statistical analyses showed that only CHT and CTR measurements exhibited sexual dimorphism. Seven multivariate discriminant functions were developed that successfully estimated sex between 80.3% and 84.5% accuracy. A cross-validation study tested the reliability of estimating sex using the seven functions. Five of the seven functions exhibited strong statistical algorithms. No ancestral differences were exhibited between the contemporary Greek and historic Portuguese skeletal collections indicating that the discriminant functions are useful for estimating sex of White Europeans from different time periods. No relationship existed between stature and any of the three measurements. Adult females exhibited no age-related changes to the vertebral morphometrics whereas males exhibited age-related changes in only four of the seven CAP diameters. Further testing revealed that these diameters gradually decreased in size between 30 years and 90 years of age. However, the CAP diameter exhibited no significant dimorphic potential for estimating sex. Therefore, this study will assist in estimating sex of unknown White European individuals from the cervical vertebrae and will be useful in cases such as mass disasters when only fragmented remains are available for examination

Investigating the unintended effects of television advertising among children in former-Soviet Bulgaria

Extensive research has been carried out to examine the unintended effects of television advertising on children in Western Europe. Little, however, is known about effects in Eastern European settings. Eastern European countries were part of the former USSR and its Soviet regime, meaning that all forms of commercial advertising were prohibited. Current parents and educators experienced the shift to capitalism first-hand and are particularly critical of consumer culture. This study adds to the current body of literature by studying unintended effects on advertising on children in a new context (i.e., Sofia, Bulgaria) and exploring the moderating effects of children’s advertising literacy. We collected data among 273 8- to 11-year-olds and found that advertising exposure increases children’s materialism and consumer involvement. We also found that children’s conceptual advert

Overfitting for Fun and Profit: Instance-Adaptive Data Compression

Neural data compression has been shown to outperform classical methods in terms of $RD$ performance, with results still improving rapidly. At a high level, neural compression is based on an autoencoder that tries to reconstruct the input instance from a (quantized) latent representation, coupled with a prior that is used to losslessly compress these latents. Due to limitations on model capacity and imperfect optimization and generalization, such models will suboptimally compress test data in general. However, one of the great strengths of learned compression is that if the test-time data distribution is known and relatively low-entropy (e.g. a camera watching a static scene, a dash cam in an autonomous car, etc.), the model can easily be finetuned or adapted to this distribution, leading to improved $RD$ performance. In this paper we take this concept to the extreme, adapting the full model to a single video, and sending model updates (quantized and compressed using a parameter-space prior) along with the latent representation. Unlike previous work, we finetune not only the encoder/latents but the entire model, and - during finetuning - take into account both the effect of model quantization and the additional costs incurred by sending the model updates. We evaluate an image compression model on I-frames (sampled at 2 fps) from videos of the Xiph dataset, and demonstrate that full-model adaptation improves $RD$ performance by ~1 dB, with respect to encoder-only finetuning.Comment: Accepted at International Conference on Learning Representations 202