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Surface mineral crusts: A priority target in search for life on Mars
Mineral crusts are strong candidates in the search for evidence of life during planetary exploration, and should be an important target for examination in impact craters. Crusts in the Haughton crater readily yield a biological signature
Quantum Communication Through an Unmodulated Spin Chain
We propose a scheme for using an unmodulated and unmeasured spin-chain as a
channel for short distance quantum communications. The state to be transmitted
is placed on one spin of the chain and received later on a distant spin with
some fidelity. We first obtain simple expressions for the fidelity of quantum
state transfer and the amount of entanglement sharable between any two sites of
an arbitrary Heisenberg ferromagnet using our scheme. We then apply this to the
realizable case of an open ended chain with nearest neighbor interactions. The
fidelity of quantum state transfer is obtained as an inverse discrete cosine
transform and as a Bessel function series. We find that in a reasonable time, a
qubit can be directly transmitted with better than classical fidelity across
the full length of chains of up to 80 spins. Moreover, the spin-chain channel
allows distillable entanglement to be shared over arbitrarily large distances.Comment: Much improved versio
Numerical Modelling and GNSS Observations of Ionospheric Depletions due to a Small-Lift Launch Vehicle
Space launches produce ionospheric disturbances which can be observed through
measurements such as Global Navigation Satellite System signal delays. Here we
report observations and numerical simulations of the ionospheric depletion due
to a Small-Lift Launch Vehicle. The case examined was the launch of a Rocket
Lab Electron at 22:30 UTC on March 22, 2021. Despite the very small launch
vehicle, ground stations in the Chatham Islands measured decreases in
line-of-sight total electron content for navigation satellite signals following
the launch. General Circulation Model results indicated ionospheric depletions
which were comparable with these measurements. Line-of-sight measurements
showed a maximum decrease of ~TECU in vertical total electron content,
compared with a simulated decrease of ~TECU. Advection of the exhaust
plume due to its initial velocity and subsequent effects of neutral winds are
identified as some remaining challenges for this form of modelling.Comment: 12 pages, 8 figure
Measuring Organizational Effectiveness: The Role Of The Organizational Community Index
The purpose of this research is to help understand the value of presuppositions through the development of a community index for organizations, that employees bring certain community appeals to organizational life. Those appeals are entrenched in ancestral paradigms of the past as a natural part of the human psyche (Nicholson, 1997). This research attempts to understand the appeals with the development of the Organizational Community Index (OCI) with three subscales: Measure of Influence; Sense of Belonging; and Feeling of Recognition. The subscales were developed based on previous research from the influence of anthropology, sociology, and psychology on organizational studies. One hundred and forty-six business professionals were surveyed as an initial sample. Results of reliability coefficients, skewness, and kurtosis indicated that the subscales are reliable and serve psychometric purposes. The OCI should be further tested with larger samples sizes and in a variety of organizations. Initial conclusions suggest that organizations might want to assess their sense of community among employees before they proceed with planned change involving organizational effectiveness
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