Algorithm for in-flight gyroscope calibration

An optimal algorithm for the in-flight calibration of spacecraft gyroscope systems is presented. Special consideration is given to the selection of the loss function weight matrix in situations in which the spacecraft attitude sensors provide significantly more accurate information in pitch and yaw than in roll, such as will be the case in the Hubble Space Telescope mission. The results of numerical tests that verify the accuracy of the algorithm are discussed

In-flight determination of spacecraft magnetic bias independent of attitude

A simple algorithm for the in-flight determination of the magnetic bias of a spacecraft is presented. The algorithm, developed for use during the Hubble Space Telescope mission, determines this bias independently of any attitude estimates and requires no spacecraft sensor data other than that from the spacecraft magnetometer(s). Estimates of the algorithm's accuracy and results from a number of numerical studies on the use of this algorithm are also presented

Flexible high-voltage supply for experimental electron microscope

Scanning microscope uses a field-emission tip for the electron source, an electron gun that simultaneously accelerates and focuses electrons from the source, and one auxiliary lens to produce a final probe size at the specimen on the order of angstroms

On the Decelerating Shock Instability of Plane-Parallel Slab with Finite Thickness

Dynamical stability of the shock compressed layer with finite thickness is investigated. It is characterized by self-gravity, structure, and shock condition at the surfaces of the compressed layer. At one side of the shocked layer, its surface condition is determined via the ram pressure, while at the other side the thermal pressure supports its structure. When the ram pressure dominates the thermal pressure, we expect deceleration of the shocked layer. Especially, in this paper, we examine how the stratification of the decelerating layer has an effect on its dynamical stability. Performing the linear perturbation analysis, a {\it more general} dispersion relation than the previous one obtained by one of the authors is derived. It gives us an interesting information about the stability of the decelerating layer. Importantly, the DSI (Decelerating Shock Instability) and the gravitational instability are always incompatible. We also consider the evolution effect of the shocked layer. In the early stages of its evolution, only DSI occurs. On the contrary, in the late stages, it is possible for the shocked layer to be unstable for the DSI (in smaller scale) and the gravitational instability (in larger scale). Furthermore, we find there is a stable range of wavenumbers against both the DSI and the gravitational instability between respective unstable wavenumber ranges. These stable modes suggest the ineffectiveness of DSI for the fragmentation of the decelerating slab.Comment: 17 pages, 6 figures. The Astrophysical Journal Vol.532 in pres

Sharyne Ryals Interview 2016

In a short interview, Sharyne Ryals discusses her experiences working as the Administrative Program Assistant as a part of the Social Science Division. At Western Oregon, she describes her responsibilities and interactions with students. She also explains how she arrived at Western Oregon University as well as her previous work at a chip manufacturing plant

Productivity and quality of 'Fuji Suprema' apple fruit in different rootstocks and growing conditions.

Planting density increasing with the use of dwarf rootstocks it is a fact that has changed the scenario of the pome culture in Brazil. The objective of this work was to evaluate the plant growth, productivity and fruit quality of the Fuji Suprema cultivar grafted on the rootstocks G.213 and M.9 in a new area (virgin soil) and in the replanting area of apple trees in Vacaria City in Rio Grande do Sul state, Brazil. The cultivar Fuji Suprema grafted on the rootstocks G.213 and M.9 was used, being the experiment 1 in new area and the experiment 2 in area of replanting of apple trees. In both experiments, the orchard was implanted in 2014. The spacing adopted was 4.0 m between rows and 0.9 m between plants, totaling a density of 2,777 plants per hectare. Vegetative/productive evaluations were carried out in the 2014, 2015, 2016, 2017, 2018 and 2019 harvests in commercial orchards of the company Rasip Agro Pastoril S/A. In the experiment 1, the G.213 rootstock was highlighted for the variables accumulated productivity, accumulated productive efficiency, ASTT, number of branches and scion volume. In this same experiment, the M.9 rootstock was overestimated in some crops for the variables fruit mass and pulp firmness. In the experiment 2, the G.213 rootstock was highlighted as to the accumulated productivity, accumulated productive efficiency, ASTT, number of branches and scion volume. In the 2016 crop, the rootstock M.9, stood out for the diameter and mass of fruits and soluble solids and in the 2017 harvest for pulp firmness. In order to cultivate Fuji Suprema, both in the new area and in the replanting area of apple trees, the G.213 rootstock is a new dwarf rootstock option for the southern region of Brazil

Possible pseudogap behavior of electron doped high-temperature superconductors

We have measured the low-energy quasiparticle excitation spectrum of the electron doped high-temperature superconductors (HTS) Nd(1.85)Ce(0.15)CuO(4-y) and Pr(1.85)Ce(0.15)CuO(4-y) as a function of temperature and applied magnetic field using tunneling spectroscopy. At zero magnetic field, for these optimum doped samples no excitation gap is observed in the tunneling spectra above the transition temperature Tc. In contrast, below Tc for applied magnetic fields well above the resistively determined upper critical field, a clear excitation gap at the Fermi level is found which is comparable to the superconducting energy gap below Tc. Possible interpretations of this observation are the existence of a normal state pseudogap in the electron doped HTS or the existence of a spatially non-uniform superconducting state.Comment: 4 pages, 4 ps-figures included, to be published in Phys. Rev. B, Rapid Com

High-grade undifferentiated pleomorphic sarcoma in the gluteus with a v-y flap: a case report

Objective: Undifferentiated pleomorphic sarcoma (UPS) is rare and affects mainly the elderly. Due to the low incidence and heterogeneous variety of this sarcoma, little is known about the UPS regarding clinical behavior, treatment strategies and prognosis. The objective is to describe the case of a young patient, with a UPS measuring 14 × 11.2 × 8.2 cm, with a 6-month evolution and no metastases. Case Report: A female patient, 34 years old, reported the presence of nodulation in the left gluteal region for 6 months with progressive growth associated with pain, weight loss of 10 kg in the last 2 months. An anatomopathological study showed a malignant neoplasm of spindle cells and high-grade pleomorphic sarcoma on immunohistochemistry. Neoadjuvant chemotherapy and complete resection of the lesion with subsequent adjuvant radiotherapy were performed. Results: Since undifferentiated pleomorphic sarcoma has a better prognosis when diagnosed early and in a small size, it is crucial to immediately recognize and assess any enlarged mass and nodule, even though it is a rare diagnosis. Conclusions: Due to the high rate of recurrence and metastasis, monitoring should be carried out regularly for years after surgical excision

Transformada de Hilbert-huang e Possíveis Aplicações à Turbulência

The Hilbert-Huang Transform is a time-frequencydecomposition method for non-stationary and non-linear signals. Possibleapplications in the study of multiplicative cascade processes, energytransfer and non-linear structures in turbulent signals are discussed.A transformada de Hilbert-Huang (THH) permite a decomposiçãoem tempo e frequência de sinais não-estacionários e não-lineares.Neste trabalho são discutidas possíveis aplicações para o estudo de processosmultiplicativos e estruturas não-lineares em sinais turbulentos