Analysis and Comparison of Physical Properties and Morphology of Impact Melt Flows on Venus and the Moon to Determine Atmospheric Controls

Impact melt flows form when target material melted by an impact breaches the rim of the impact crater. The melt flows out and away from the crater, forming a lava flow. Such flows have been identified on Venus and the Moon by previous studies. This study aims to document impact melt flows on these two bodies to determine the differences, if any, between them, and to ascertain whether these differences are due to atmospheric conditions. Previously recorded morphological data from Robert Herrick of the Lunar and Planetary Institute and Neish et al. (2014) are used in conjunction with S-band (12.6 cm) radar data from the Magellan spacecraft, the Arecibo Observatory, and the Lunar Reconnaissance Orbiter. It was found that the flow length in terms of crater diameter and CPR, a proxy for surface roughness, are very different for the flows on the two bodies. Venus flows originating from craters with a diameter d ≥ 15 km had an average flow length of 2.33 crater diameters, and lunar flows originating from craters d ≥ 15 km had an average flow length of 0.47 crater diameters. The CPR of Venus flows at radar incidence angles of 40-60° averaged at 0.305 and the CPR of lunar flows averaged at 0.868, meaning that lunar flows are rougher on centimeter scales. These differences are consistent with those that would be produced by the differing surface temperatures on the two bodies; the higher temperature on Venus slows the melt’s cooling rate, decreases its viscosity, slows the increase in its viscosity due to cooling, and increases melt volume. These effects produce longer and smoother flows. Differences in melt composition and impact velocity may also be responsible for these differences. These factors would affect the viscosity and volume of the flows such that Venus flows would be smoother and longer. Further study including thermodynamic and rheological modeling as well as examining impact melt flows on other bodies such as Mars will be necessary to determine what the primary controls on impact melt flow length and roughness are

Acute hydrogen sulfide-induced neuropathology and neurological sequelae: challenges for translational neuroprotective research.

Hydrogen sulfide (H2 S), the gas with the odor of rotten eggs, was formally discovered in 1777, over 239 years ago. For many years, it was considered an environmental pollutant and a health concern only in occupational settings. Recently, however, it was discovered that H2 S is produced endogenously and plays critical physiological roles as a gasotransmitter. Although at low physiological concentrations it is physiologically beneficial, exposure to high concentrations of H2 S is known to cause brain damage, leading to neurodegeneration and long-term neurological sequelae or death. Neurological sequelae include motor, behavioral, and cognitive deficits, which are incapacitating. Currently, there are concerns about accidental or malicious acute mass civilian exposure to H2 S. There is a major unmet need for an ideal neuroprotective treatment, for use in the field, in the event of mass civilian exposure to high H2 S concentrations. This review focuses on the neuropathology of high acute H2 S exposure, knowledge gaps, and the challenges associated with development of effective neuroprotective therapy to counteract H2 S-induced neurodegeneration

Project track and trace ontology

It is well-known that ontology is utilized as an effective methodology to share domain-specific knowledge in multidisciplinary fields. In the field of project management, due to the characteristic of project organizations in which project members are geographically dispersed and from different cultural background, senior management would feel difficulty when they attempt to know about the detailed project completion status from dispersed project groups. Thus, the objective of this paper is to propose an automated project track and trace methodology through the use of ontology technology, to challenge the knowledge sharing issues in project organizations. By means of extending CCCI Metrics into the field of project management and introducing a new ontological notation system, we deliver the project track and trace ontology

Ontology for automated multi-site project management

One characteristic of multi-site project organizations is that people in the organizations are geographically dispersed and from different cultural background, which challenges the senior management to successfully complete the task of project management. Here we introduce the theory of CCCI Metrics in order to solve the issue. By means of ontology technology, we propose an ontology-based system which is to help the senior management to realize the function of automated project management in multi-site project organization

Compare and contrast of contemporary technical knowledge sharing technologies

Knowledge sharing is not a new topic in knowledge management research field. Many methodologies have been proposed, which aims to exploit the embodied knowledge in practice and transform them to a normal form so that other staffs and organizations can utilize it. In this paper, we propose to compare and contrast the contemporary technical knowledge sharing technologies. We categorize the existing technologies into the implemented and the experimental, and analyze them from multiple perspectives. Conclusion and future work are made in the final section

Session 1e: Nuclear Energy: Then, Now and the Future

Nuclear power is one of the most feared and misunderstood energy sources available, and its unique advantages - extraordinary power production with no emissions - weigh against its disadvantages - possibility of meltdowns, difficulty of waste disposal, and potential weaponization. This session will explore some of the basics of nuclear power through a variety of interactive activities for students and give an overview of the economics and risks associated with nuclear power. It will also discuss potential future technologies, including fusion, and how they would change worldwide energy production

Multi-site project organisation knowledge sharing ontology

The implementation of ontology starts to step into the field of project organizations. With the appearance of project outsourcing, the location of project workplace becomes increasingly multiple, which challenges the administration of senior management to projects. In this paper, we analyze the daily knowledge sharing activities, including the organizational structure, the procedure of project planning and the scenarios of project distribution, by a case study in City of Melville Council -- a typical multi-site project organization, to discover the issues in these activities. By means of extending the theory of CCCI Metrics into the field of project management, we design the multi-site project track and trace ontology, in order to promote the knowledge sharing activities between senior management and project groups