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  • 1
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    MIT's interferometer CST testbed (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The MIT Space Engineering Research Center (SERC) has developed a controlled structures technology (CST) testbed based on one design for a space-based optical interferometer. The role of the testbed is to provide a versatile platform for experimental investigation and discovery of CST approaches. In particular, it will serve as the focus for experimental verification of CSI methodologies and control strategies at SERC. The testbed program has an emphasis on experimental CST--incorporating a broad suite of actuators and sensors, active struts, system identification, passive damping, active mirror mounts, and precision component characterization. The SERC testbed represents a one-tenth scaled version of an optical interferometer concept based on an inherently rigid tetrahedral configuration with collecting apertures on one face. The testbed consists of six 3.5 meter long truss legs joined at four vertices and is suspended with attachment points at three vertices. Each aluminum leg has a 0.2 m by 0.2 m by 0.25 m triangular cross-section. The structure has a first flexible mode at 31 Hz and has over 50 global modes below 200 Hz. The stiff tetrahedral design differs from similar testbeds (such as the JPL Phase B) in that the structural topology is closed. The tetrahedral design minimizes structural deflections at the vertices (site of optical components for maximum baseline) resulting in reduced stroke requirements for isolation and pointing of optics. Typical total light path length stability goals are on the order of lambda/20, with a wavelength of light, lambda, of roughly 500 nanometers. It is expected that active structural control will be necessary to achieve this goal in the presence of disturbances.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: MIT Space Engineering Research Center; 20 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    RFI Risk Reduction Activities Using New Goddard Digital Radiometry Capabilities (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Goddard Radio-Frequency Explorer (GREX) is the latest fast-sampling radiometer digital back-end processor that will be used for radiometry and radio-frequency interference (RFI) surveying at Goddard Space Flight Center. The system is compact and deployable, with a mass of about 40 kilograms. It is intended to be flown on aircraft. GREX is compatible with almost any aircraft, including P-3, twin otter, C-23, C-130, G3, and G5 types. At a minimum, the system can function as a clone of the Soil Moisture Active Passive (SMAP) ground-based development unit [1], or can be a completely independent system that is interfaced to any radiometer, provided that frequency shifting to GREX's intermediate frequency is performed prior to sampling. If the radiometer RF is less than 200MHz, then the band can be sampled and acquired directly by the system. A key feature of GREX is its ability to simultaneously sample two polarization channels simultaneously at up to 400MSPS, 14-bit resolution each. The sampled signals can be recorded continuously to a 23 TB solid-state RAID storage array. Data captures can be analyzed offline using the supercomputing facilities at Goddard Space Flight Center. In addition, various Field Programmable Gate Array (FPGA) - amenable radiometer signal processing and RFI detection algorithms can be implemented directly on the GREX system because it includes a high-capacity Xilinx Virtex-5 FPGA prototyping system that is user customizable.
    Keywords: Instrumentation and Photography
    Type: GSFC.CPR.7021.2012 , IEEE 2012 Geoscience and Remote Sensing Symposium; Jul 23, 2012 - Jul 27, 2012; Munich; Germany
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    NASA TECHNICAL REPORTS
  • 3
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    NOAA-20 ATMS Status: ATMS SDR Team (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: Data quality looks better than Suomi-NPP (Suomi National Polar-orbiting Partnership): similar biases. Smaller standard deviation of first guess departures and diagnosed observation errors. Weaker striping signal than Suomi-NPP ATMS (Advanced Technology Microwave Sounder). Improved first guess fits to: temperature observations (AMSU-A (Advanced Microwave Sounding Unit-A), CrIS (Cross-track Infrared Sounder), GPSRO (Global Positioning System Radio Occultation)); Humidity observations (MHS (Microwave Humidity Sounder), GEO CSRs (Geostationary Orbit Clear Sky Radiances)). Indicates improved accuracy of short range temperature and humidity forecasts. Neutral to slightly positive forecast scores.
    Keywords: Meteorology and Climatology
    Type: GSFC-E-DAA-TN66556 , Annual Meeting Global Space-based Inter-Calibration System (GSICS 2019); Mar 04, 2019 - Mar 08, 2019; Frascati; Italy
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Passive Micromixers (2021)
    MDPI - Multidisciplinary Digital Publishing Institute
    Details
    Publication Date: 2022-01-31
    Description: Micro-total analysis systems and lab-on-a-chip platforms are widely used for sample preparation and analysis, drug delivery, and biological and chemical syntheses. A micromixer is an important component in these applications. Rapid and efficient mixing is a challenging task in the design and development of micromixers. The flow in micromixers is laminar, and, thus, the mixing is primarily dominated by diffusion. Recently, diverse techniques have been developed to promote mixing by enlarging the interfacial area between the fluids or by increasing the residential time of fluids in the micromixer. Based on their mixing mechanism, micromixers are classified into two types: active and passive. Passive micromixers are easy to fabricate and generally use geometry modification to cause chaotic advection or lamination to promote the mixing of the fluid samples, unlike active micromixers, which use moving parts or some external agitation/energy for the mixing. Many researchers have studied various geometries to design efficient passive micromixers. Recently, numerical optimization techniques based on computational fluid dynamic analysis have been proven to be efficient tools in the design of micromixers. The current Special Issue covers new mechanisms, design, numerical and/or experimental mixing analysis, and design optimization of various passive micromixers.
    Keywords: TP1-1185 ; T1-995 ; micromixer design ; passive micromixer ; design optimization ; mixing mechanism ; analysis of mixing
    Language: English
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    E-BOOK
  • 5
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    Marine Proteins and Peptides (2021)
    MDPI - Multidisciplinary Digital Publishing Institute
    Details
    Publication Date: 2023-12-21
    Description: Marine proteins and peptides have great potential application in developing pharmaceuticals, nutraceuticals, and cosmeceuticals. Proteins and peptides from marine sources are considered to be safe and inexpensive. Protein- and peptide-based drugs have been increasing in recent days to cure various diseases by serving multiple roles, such as antioxidants, anticancer drugs, antimicrobials, and anticoagulants. There are different marine sources (macroalgae, fish, shellfish, and bivalves), which possibly contain specific protein and peptides.
    Keywords: R5-920 ; anticoagulant proteins and peptides ; cardio protective proteins and peptides ; fish collagen ; antifreeze proteins and peptides ; antihypertensive proteins ; anticancer proteins and peptides ; antimicrobial protein and peptides ; antitumor proteins and peptides ; antioxidant proteins and peptides ; macro algae protein ; isolation process ; fish gelatin ; digestive enzymes ; bic Book Industry Communication::M Medicine
    Language: English
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    E-BOOK
  • 6
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    Volatile Organic Compounds in Environment (2021)
    MDPI - Multidisciplinary Digital Publishing Institute
    Details
    Publication Date: 2022-01-31
    Description: Volatile organic compounds (VOCs) are released from both static and mobile sources (e.g., industrial, transport, household, fossil fuels use, and many other sources). They are emitted into the atmosphere, taken up by plants, and ingested by animals to be bio accumulated along the food chain up to the apex predator. Many of these pollutants are classified as being toxic/carcinogenic by varying degrees and pose a worldwide risk to the environment and human health. Exposure (through different exposure pathways, i.e., inhalation, dermal absorption, ingestion, etc.) to those hazardous pollutants can damage the immune, neurological, reproductive (e.g., reduced fertility), developmental, and respiratory systems of humans and animals. More efforts are thus needed to improve the method of their detection and treatment. This Special Issue aims to present articles emphasizing more than one of all the available tools to monitor or treat VOCs: (1) measurement techniques for VOC; (2) treatment techniques for VOC; and (3) all important environmental issues associated with the management of VOCs.
    Keywords: GE1-350 ; Volatile organic compounds ; Reatment ; Sensing ; Environment ; Monitoring
    Language: English
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    E-BOOK
  • 7
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    Harmonic Oscillators and Two-by‑two Matrices in Symmetry Problems in Physics (2021)
    MDPI - Multidisciplinary Digital Publishing Institute
    Details
    Publication Date: 2023-12-20
    Description: This book consists of the articles published in the special issues of this Symmetry journal based on two-by-two matrices and harmonic oscillators. The book also contains additional articles published by the guest editor in this Symmetry journal. They are of course based on harmonic oscillators and/or two-by-two matrices. The subject of symmetry is based on exactly soluble problems in physics, and the physical theory is not soluble unless it is based on oscillators and/or two-by-two matrices. The authors of those two special issues were aware of this environment when they submitted their articles. This book could therefore serve as an example to illustrate this important aspect of symmetry problems in physics.
    Keywords: QA1-939 ; Frontier physics ; Symmetry problems in Fundamental physics ; Foundations of quantum mechanics ; Physical applications of the groups based two-by-two matrices ; Classical and quantum oscillators ; Applied physics ; bic Book Industry Communication::P Mathematics & science
    Language: English
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    E-BOOK
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