- API data.nasa.gov | Last Updated 2018-09-07T17:47:02.000Z
The objective of the proposed work is to demonstrate the suitability of artificial single-crystal diamond detectors (SCDDs) for use as the scattering medium in Compton telescopes for medium-energy gamma-ray astronomy. SCDDs offer the possibility of position and energy resolution comparable to those of silicon solid-state detectors (SSDs), combined with efficiency and timing resolution so-far only achievable using fast scintillators. When integrated with a calorimeter composed of fast inorganic scintillator, such as CeBr3, read out by silicon photomultipliers (SiPMs), SCDDs will enable a compact and efficient Compton telescope using time-of-flight (ToF) discrimination to achieve low background and high sensitivity. This detector development project will be a collaboration between the University of New Hampshire (UNH) and Southwest Research Institute (SwRI). The proposed work represents an innovative combination of detector technologies originally conceived separately for high-energy astronomy (fast scintillators read out by SiPMs; UNH) and space plasma/particle physics (SCDDs; SwRI). Recently SwRI has demonstrated that SCDDs fabricated using chemical vapor deposition (CVD) show good energy resolution (~7 keV FWHM), comparable to silicon SSDs, with much faster time response (~ns rise time) due to higher electron/hole mobilities. They are also temperature- and light-insensitive, and radiation hard. In addition, diamond is low-Z, composed entirely of carbon, but relatively high-density (3.5 g cm-3) compared to silicon or organic scintillator. SCDDs are therefore an intriguing possibility for a new Compton scattering element: if patterned with ~mm-sized readout electrodes and combined with a fast inorganic scintillator calorimeter, SCDDs could enable a compact but efficient Compton telescope with superior angular and energy resolution, while maintaining ToF background rejection. Such an instrument offers the exciting potential for unprecedented sensitivity, especially at energies < 1 - 2 MeV, on a small-scale mission utilizing recently available SmallSat buses (payload mass <100 kg). We propose to demonstrate this by constructing and testing a small proof-of-concept prototype and, based on its performance, using Monte Carlo simulations to explore the possibilities of furthering MeV science using relatively small-scale space missions.
- API data.nasa.gov | Last Updated 2018-09-07T17:47:26.000Z
<p>The molecular chemistry of interstellar and circumstellar environments consists of a complex interplay between gas- and solid-phase processes. An important step in unraveling this chemistry has been the observation and identification of gas-phase molecules, mainly by radio and microwave observations. Nearly 200 interstellar and circumstellar gas-phase molecules are known, but only about 10 identifications, mostly from infrared (IR) studies, have been made of solid-phase species, usually termed 'ices'. Determining the abundances of icy molecules has been a continual challenge due to the lack of appropriate laboratory measurements of spectral band strengths, optical constants, refractive indices, and ice densities. Our research group is now engaged in two new laboratory programs for just such measurements. In one program we measure IR optical constants (n and k) for molecules found in molecular ices. Our second new laboratory program focuses on densities and refractive indices, which are required for generating optical constants and spectral band strengths from laboratory IR data. This combination of research efforts within a single facility provides an unusual, if not unique, opportunity for producing the lab data required for more-accurate analysis and interpretation of Spitzer, and other, observations of interstellar ices. In spite of a general belief that such lab results may already be available, a careful literature search quickly reveals significant, surprising, and stunning gaps and deficiencies. The current situation is paradoxical in that twenty-first century spectra of astronomical ices near 10 K are being analyzed for molecular abundances using room-temperature physical properties and results from vacuum-tube dispersive spectrometers and mechanical planimeters. Here we propose a systematic effort to bring the lab data into the twenty-first century through the measurement of IR spectra and optical constants, refractive indices, and densities of several known interstellar ices and selected mixtures involving them. We also will study the degree to which data for individual covalently-bonded molecules can be combined and used to interpret the spectra of mixed-molecular ices.</p>
- API data.nasa.gov | Last Updated 2018-07-19T04:57:43.000Z
This data set contains raw 9P/Tempel 1 and science calibration images acquired by the Deep Impact Impactor Targeting Sensor Visible CCD during the 9P encounter phase of the mission.
- API data.nasa.gov | Last Updated 2018-07-19T05:33:21.000Z
Electron rates and Alpha and proton intensities as described below.
Ultra-High Energy Density, High Power and High Efficiency Nanocomposite Capacitor for Aerospace Power System, Phase Idata.nasa.gov | Last Updated 2018-07-19T07:55:27.000Z
NASA requires high energy density, high voltage, high power and high efficiency capacitor that can be integrated into the system to decrease the mass and space at the system architecture level and increase the efficiency. The current state-of-the-art of the capacitor has low energy, low power density and low energy storage efficiency, making them bulky and costly for the applied system. For the NASA application, in order to maintain the energy or power system work property, onboard cooling systems has been installed, which in turn increase the mass and space. Therefore, it is important to develop improved capacitors in energy density, speed, efficiency to minimize the size and mass of future powr system. In this proposal, Powdermet proposed to develop another type advanced nanocomposite capacitor with ultra-high energy density, high voltage, high power and high energy storage efficiency. This novel capacitor will feature ultra-high energy density (>40 J/cc), high operating voltage (>kilovolt), high powder density (> MW/cc), especially high energy storage efficiency (>95%).
- API data.nasa.gov | Last Updated 2018-07-19T04:27:05.000Z
Line of Sight Acceleration Profile Data Records (LOSAPDR) consist of data from Doppler tracking of the orbiting spacecraft. The relative motion of the spacecraft and the earth-based radio receiver is measured very precisely, and known motions are removed a priori (i.e. earth rotation, planetary motions, spacecraft orbital motion, solar pressure, drag), leaving small velocity changes caused by variations in the mass distribution of the planet. The residual Doppler frequency shifts are linearly proportional to the component of velocity in the Earth direction. Numerical differentiation of these velocity residuals with respect to time produces line-of-sight (LOS) gravity. These measures are accelerations at spacecraft altitude which can be modeled for geophysical interpretation. For information on Lunar Prospector (LP) gravity investigations see [KONOPLIVETAL1998 CARRANZAETAL1999].
- API data.nasa.gov | Last Updated 2018-07-19T10:53:47.000Z
NASA space exploration missions require radiation-hardened memory technologies that can survive and operate over a wide temperature range. Memristors (memory-resistors) are a promising technology for the next generation of non-volatile memory (NVM) applications and offer a highly-desirable combination of density, access speed, and power. Early investigations have also shown that memristors have high radiation hardness. In this SBIR, CFDRC and Arizona State University propose to develop, characterize, and demonstrate novel, memristor-based, radiation-hardened NVM for NASA space applications. In Phase I we will: 1) Fabricate state-of-the-art Chalcogenide Glass (ChG) memristors based on the CBRAM technology; 2) Examine their wide temperature performance (-230 to +130 deg.C) via thermal experiments; and 3) Add new models to CFDRC's NanoTCAD Mixed-Mode simulator for accurate physics-based simulation of memristors. The Phase I effort will evaluate suitability of ChG memristors for extreme temperature applications. In Phase II, we will extend our scope to include wide-temperature investigation of the competing transition-metal-oxide (TMO, e.g., TiO2) memristor technology. For both ChG and TMO, we will then perform irradiation testing and down-select the technology with the best extreme environment (radiation + temperature) performance. Subsequently, we will generate wide-temperature, radiation-enabled, device physics and compact models for the memristors, develop designs for memristor-based NVM, and perform mixed-mode simulations to determine their radiation and thermal response. These results, and physics-based understanding of device response, will be used to develop an NVM prototype that will be tested and demonstrated for NASA space applications.
- API data.nasa.gov | Last Updated 2018-07-19T05:26:06.000Z
This dataset contains calibrated images of comet 9P/Tempel 1 acquired by the Impactor Targeting Sensor Visible CCD (ITS) after the impactor was released from the flyby spacecraft on 03 July 2005 during the Deep Impact mission. Version 3.0 was calibrated by the EPOXI mission pipeline and includes corrected observation times with a maximum difference of about 40 milliseconds, a change to decompress the camera's zero-DN lookup table entry to the top of its range and flag the affected pixels as saturated, and the replacement of the I-over-F data products by multiplicative constants for converting radiance products to I-over-F.
- API data.nasa.gov | Last Updated 2018-07-20T07:11:25.000Z
The proposed SBIR project will develop OZ, an innovative primary flight display for aircraft. The OZ display, designed from "first principles" of vision science, cognition, and Human-Centered Computing, brings all cockpit information required for flight together into a single, unified display that uses a common frame of reference employing both the focal and ambient channels of human visual processing. This proposal addresses Topic A1.05 Crew Systems Technologies for Improved Aviation Safety. It specifically addresses the goals of ensuring appropriate situation awareness and facilitating and extending human perception, information interpretation, and response planning and selection. Its primary focus is in the SBIR topical areas of interest in Data fusion technologies for real-time integration and integrity checking of single source information streams of varying spatial and temporal resolution; and Human-centered technologies to improve the access and performance of less-experienced operators and pilots from special population groups. Previous experimentation has shown that OZ provides significantly better performance for pilots than conventional flight instrumentation. The proposal will test the feasibility of using OZ to provide situational awareness superior to that provided by both conventional instrumentation and commercially available electronic primary flight displays. Phase I will show that OZ is also superior to existing electronic primary flight displays that display conventional flight instrumentation on an electronic display and will develop and demonstrate a prototype OZ system in a general aviation aircraft. In Phase II the prototype system will be flight tested against competing electronic flight information systems and a DO-178B compliant OZ system will be developed and flight tested to determine its suitability for FAA certification for general aviation aircraft.
- API data.nasa.gov | Last Updated 2018-07-19T16:15:59.000Z
Dropsondes are one of the primary in-situ measurement tools available to research aircraft and Unmanned Aerial Vehicles (UAVs). Unlike sensors mounted on aircraft, dropsondes allow a vertical profile of the atmosphere to be taken below the aircraft. A guided dropsonde which could glide away from the launch aircraft will allow profiles to be taken away from the aircraft flight path, and would offer aircraft the ability to deploy dropsondes into dangerous environments, such as thunderstorms and volcanic plumes, where few aircraft are able to safely venture. Anasphere, Inc., in cooperation with Vanilla Aircraft, Inc., proposes to develop a guided dropsonde to meet this need. This dropsonde will be designed as a lifting body. It will build upon an existing miniature dropsonde developed by Anasphere, have essentially no moving parts, retain the ability to return wind profiles along with accurate meteorological data, and have sufficient speed to penetrate moderate headwinds. Phase I work will include designing and prototyping the aerodynamic form, integrating essential guidance electronics, and conducting extensive glide tests. Phase II work will include the integration of complete sensor, guidance, and communications payloads, refinement of the aerodynamic form, and extensive live flight tests from high altitude.