Abstract A star tracker calibration method using images is presented in this paper. Unlike previous works, the proposed estimates all parameters and attitudes at once a single least-squares formulation for optimal calibration, which can be easily converted to recursive estimation form. In addition, paper presents estimate overall performance attitude determination from results. Since uses only,...

Large flexible aircraft are often accompanied by large deformations during flight leading to obvious geometric nonlinearities in response. Geometric nonlinear dynamic response simulations based on full-order models carry unbearable computing burden. Meanwhile, caused wings most cases and the deformation of fuselages is small. Analyzing whole as a structure will greatly increase analysis complex...

The plinth elevation angle was related to the upstream slope and face slab shape of CFRD, as well dam axis, which very important in design. Based on space vector algorithm, function established consists three-dimensional coordinate key points line, taken unique input variable, then directly obtained. improved method with characteristics high efficiency, simple parameters clear spatial concept, ...

Dominance in socially foraging animals may be related to sex and to variation in individual quality. Individual quality may in turn reflect conditions during early development. We studied dominance in a cohort of adult European starlings, Sturnus vulgaris, that had been subject to experimental manipulations of food supply and begging effort when they were nestlings. We measured dominance in two...

Although boys outshine girls in a range of motor skills, there are no reported gender differences in motor performance during infancy. This study examined gender bias in mothers' expectations about their infants' motor development. Mothers of 11-month-old infants estimated their babies' crawling ability, crawling attempts, and motor decisions in a novel locomotor task-crawling down steep and sh...

1. introduction mountain regions are increasingly endangered by a variety of disaster, including avalanche, debris flows, and rock slide. some characteristics such as elevation, angle of slope, vegetation and climatic elements could affect the avalanche event. indeed, avalanche is the second factor in soil erosion that causes demolition; therefore, it threatens the food safety. iran has two mai...

In this paper, we present the procedure of estimating aerodynamic coefficients for a commercial aviation aircraft from geometric parameters at low-cruise-flight conditions using US DATCOM (United States Data Compendium) and XFLR software. The purpose research was to compare stability both pieces software determine efficacy solution wide-body stated flight conditions. During initial phase projec...

Low socioeconomic status (SES) children perform on average worse on intelligence tests than children from higher SES backgrounds, but the developmental relationship between intelligence and SES has not been adequately investigated. Here, we use latent growth curve (LGC) models to assess associations between SES and individual differences in the intelligence starting point (intercept) and in the...

Traditional slope stability analysis is limited to the use of single valued parameters to analyze a slope‟s characteristics. Consequently, traditional analysis methods yield single valued estimates for factor of safety of a slope‟s stability. However, the inherent variability of the soil characteristics which affect slope stability indicates that the stability of a slope is a probabilistic rath...

Seawalls are built for Protecting of beaches against waves and preventing the progression of water to the beach. For a proper understanding about these constructions, a suiTable information about applied loads on these constructions should be existed. One of the important load that applied on these constructions is sea wave. Others loads are included: weight force of the walls, weight force of ...