Cubesat Electrostatic Dust Analyzer (CEDA) for Measuring Regolith Dust Transport on Airless Bodies

The CubeSat Electrostatic Dust Analyzer (CEDA) is developed by the Dust BUSTER student team at the University of Colorado for exploring electrostatic dust transport processes on the surfaces of airless bodies such as asteroids and the Moon. CEDA is a 6U cubesat that consists of a 2U dust analyzer module and an autonomous repositioning system (ARS). This instrument measures the charge, velocity, and mass of lofted dust particles, and provides the lofting rate in order to estimate the efficiency of electrostatic dust transport in surface processes. The dust analyzer module consists of two Dust Trajectory Sensor (DTS) units with a Deflection Field Electrodes (DFE) unit in between them. A dust particle can enter from either end of the analyzer and its charge and velocity are measured using the wire-electrodes on which the charge is induced as the particle passes through. The charged particle is deflected in the DFE where its mass is determined from the deflection trajectory. The ARS, consisting of the sun sensors, cover doors and tilting mechanisms, repositions the instrument for optimized dust measurement on the surface. The communication needs to be provided by the mother spacecraft

Sample return of interstellar matter (SARIM)

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Comparison of elastase-1 with amylase, lipase, and tryspin-like immunoreactivity in the diagnosis of acute pancreatitis

SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Ultrastructure of clear cell carcinoma of the vagina and the cervix. Report of a case with unusual ultrastructural findings

A 27 yr old female was admitted for an investigation of a vaginal tumor. On examination, a lesion measuring 9 x 6 x 5 cm extending to the lower portion of the exocervix was noted. A biopsy demonstrated a clear cell adenocarcinoma. There was no history of maternal medication. Radical hysterectomy and upper half vaginectomy were performed. Electron microscopic observations, limited to the carcinoma cells, confirmed descriptions previously published. The striking feature of this case was the presence of vesicular aggregates in a large proportion of the nuclei. These aggregates consisted of vesicles measuring from 600 Å to 850 Å in diameter and characterized by a single, smooth membrane. The aggregates were located in the nucleoplasm, in the perinuclear cytoplasm or were enclosed between the two membranes of the nuclear envelope. The number of these structures varied in different nuclei. This seems to be the first description of vesicular aggregates in a malignant tumor of the female genital tract. Previous reports of ultrastructural studies of the vaginal clear cell carcinoma do not mention this morphologic entity. In this case (no maternal medication) the patient was taking sequential oral contraceptives for more than 12 mth at the time of surgery. This very specific hyperplasia of the cellular membrane system may represent an abnormal response to oral progestational steroids combined with estrogen. In the ovary, where these cells have been described, the high hormonal activity of pregnancy may be responsible for this ultrastructural modification.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Measurements of the Ionization Coefficient of Simulated Iron Micrometeoroids

The interpretation of meteor radar observations has remained an open problem for decades. One of the most critical parameters to establish the size of an incoming meteoroid from radar echoes is the ionization coefficient, beta, which still remains poorly known. Here we report on new experiments to simulate micrometeoroid ablation in laboratory conditions to measure beta for iron particles impacting N2, air,CO2, and He gases. This new data set is compared to previous laboratory data where we find agreement except for He and air impacts greater than 30 kms. We calibrate the Jones model of beta(v) and provide fit parameters to these gases and find agreement with all gases except CO2 and high-speed air impacts where we observe beta(sub air) greater than 1 for velocities greater than 70 kms. These data therefore demonstrate potential problems with using the Jones model for CO2 atmospheres as well as for high-speed meteors on Earth

SARIM PLUS—sample return of comet 67P/CG and of interstellar matter

The Stardust mission returned cometary, interplanetary and (probably) interstellar dust in 2006 to Earth that have been analysed in Earth laboratories worldwide. Results of this mission have changed our view and knowledge on the early solar nebula. The Rosetta mission is on its way to land on comet 67P/Churyumov-Gerasimenko and will investigate for the first time in great detail the comet nucleus and its environment starting in 2014. Additional astronomy and planetary space missions will further contribute to our understanding of dust generation, evolution and destruction in interstellar and interplanetary space and provide constraints on solar system formation and processes that led to the origin of life on Earth. One of these missions, SARIM-PLUS, will provide a unique perspective by measuring interplanetary and interstellar dust with high accuracy and sensitivity in our inner solar system between 1 and 2 AU. SARIM-PLUS employs latest in-situ techniques for a full characterisation of individual micrometeoroids (flux, mass, charge, trajectory, composition) and collects and returns these samples to Earth for a detailed analysis. The opportunity to visit again the target comet of the Rosetta mission 67P/Churyumov-Gerasimeenternko, and to investigate its dusty environment six years after Rosetta with complementary methods is unique and strongly enhances and supports the scientific exploration of this target and the entire Rosetta mission. Launch opportunities are in 2020 with a backup window starting early 2026. The comet encounter occurs in September 2021 and the reentry takes place in early 2024. An encounter speed of 6 km/s ensures comparable results to the Stardust mission