69 research outputs found
Search for production of strangelets in quark matter using particle correlations
We present a new technique for observing the strangelet production in quark matter based on unlike particle correlations. A simulation is presented with a two-phase thermodynamical model
Demonstration of a Hybrid Space Architecture During RIMPAC 2020
The Micro-Satellite Military Utility (MSMU) Project Arrangement (PA) is an agreement under the Responsive Space Capabilities (RSC) Memorandum of Understanding (MOU) that involves the Departments and Ministries of Defence of Australia, Canada, Germany, Italy, the Netherlands, New Zealand, Norway, United Kingdom and United States. MSMUâs charter is to inform a space enterprise that provides military users with reliable access to a broad spectrum of information in an opportunistic environment.
Research and Development teams from MSMU partner nations supported Exercise Rim of the Pacific (RIMPAC) 2020 which took place 17 to 31 August 2020 in the Hawaiian region. RIMPAC 2020 provided an opportunity to explore the military utility of a Hybrid Space Architecture (HSA) of satellites including traditional government and commercial satellites, as well as micro-satellites and nanosatellites, by leveraging contributions across the MSMU partner nations. The objective was to continue testing the hypothesis that an HSA, mostly composed of small satellites, can bring significant value to the operational theatre. The MSMU PA partner nations have leveraged several multi-national exercises, with the first being the Exercise RIMPAC 2018. Previous exercises enabled multinational technology advancements, interoperability testing, process refinement, and capability developments to make advancements towards MSMUâs goal to address the warfighterâs need for diverse ISR capabilities. The most recent accomplishment was a major integration effort across mission planning tools, space-based Intelligence, Surveillance and Reconnaissance (ISR) data providers, and exploitation tools.
The MSMU team accessed ~256 space-based sensors (EO â Electro Optical, SAR â Synthetic Aperture Radar, AIS â Automatic Identification System) to collect maritime domain and ISR data over a harbor, airfields and open sea. Data was exploited via international channels in order to determine the success rate of capturing pertinent data to be later exploited and disseminated. This paper describes results from the experiment and offers insights into the HSA military utility
Energy and Flux Measurements of Ultra-High Energy Cosmic Rays Observed During the First ANITA Flight
The first flight of the Antarctic Impulsive Transient Antenna (ANITA)
experiment recorded 16 radio signals that were emitted by cosmic-ray induced
air showers. For 14 of these events, this radiation was reflected from the ice.
The dominant contribution to the radiation from the deflection of positrons and
electrons in the geomagnetic field, which is beamed in the direction of motion
of the air shower. This radiation is reflected from the ice and subsequently
detected by the ANITA experiment at a flight altitude of 36km. In this paper,
we estimate the energy of the 14 individual events and find that the mean
energy of the cosmic-ray sample is 2.9 EeV. By simulating the ANITA flight, we
calculate its exposure for ultra-high energy cosmic rays. We estimate for the
first time the cosmic-ray flux derived only from radio observations. In
addition, we find that the Monte Carlo simulation of the ANITA data set is in
agreement with the total number of observed events and with the properties of
those events.Comment: Added more explanation of the experimental setup and textual
improvement
Modeling Sea Bottom Hyperspectral Reflectance
Over the near-ultraviolet (UV) and visible spectrum the reflectance from mineral compounds and vegetation is predominantly due to absorption and scattering in the bulk material. Except for a factor of scale, the radiative transfer mechanism is similar to that seen in murky optically complex waters. We therefore adapted a semi-empirical algebraic irradiance model developed by Albert and Mobley to calculate the irradiance reflectance from both mineral compounds and vegetation commonly found on the sea bottom. This approach can be used to accurately predict the immersed reflectance spectra given the reflectance measured in air. When applied to mineral-based compounds or various types of marine vegetation, we obtain a simple two-parameter fit that accurately describes the key features of the reflectance spectra. The non-linear spectral combination effect as a function of the thickness of vegetation growing on a mineral substrate is then accounted for by a third parameter
Potential Discrimination of Toxic Industrial Chemical Effects on Poplar, Canola and Wheat, Detectable in Optical Wavelengths 400â2450 nm
This research examined the spectral response of
poplar (Populus deltoides, Populus trichocarpa), wheat (Triticum
aestivum), and canola (Brassica napus) leaves subjected to fumigation
with gaseous phase toxic industrial chemical gases (TICs).
The gases include ammonia (NH ), sulphur dioxide (SO ), hydrogen
sulphide (H S), chlorine (Cl ), and hydrogen cyanide
(HCN). This study aimed to determine if: 1) vegetation subjected
to TICs could be distinguished from background vegetation
during varying growth stages and environmental stresses; and,
2) different TICs could be distinguished based on the spectral response
of vegetation. The results showed that both environmental
and TICs induced similar spectral features inherent to plants,
which are related primarily to chlorophyll and water loss. These
features include pigments in the visible and cellulose, lignin, lipids
starches, and sugars in the SWIR. Although no specific spectral
features could be tied to individual TICs an analysis of the data
using vegetation indices showed that the TICs and environmental
stresses result in diagnostic trends from healthy mature to highly
stressed leaves. In addition combinations of specific indices could
be used to distinguish the effects of NH , SO , Cl and their effect
from that of other treatments of the study. The continued goal for
this research program is to develop a remote detection capability
for hazardous events such as a toxic gas leak. Our findings at the
leaf level suggest that damage can be detected within 48 hrs and
should last for an extended period. Thus, the next experimental
step is to test if the results shown here at the leaf level can also be
detected with airborne and satellites systems
- âŠ