A critical test of the electrical discharge model of the Venus microwave emission

Critical test of electric discharge model for Venus microwave emissio

Evaluation differences on Mars

Space science research on elevation differences on Mar

The case for ice clouds on Venus

Ice cloud analysis for Venus atmospher

An analysis of Martian photometry and polarimetry

Martian surface photometry and polarimetry analysi

Optical Detection of Blade Flutter

Dynamic strain gages mounted on rotor blades are used as the primary instrumentation for detecting the onset of flutter and defining the vibratory mode and frequency. Optical devices are evaluated for performing the same measurements as well as providing supplementary information on the vibratory characteristics. Two separate methods are studied: stroboscopic imagery of the blade tip and photoelectric scanning of blade tip motion. Both methods give visual data in real time as well as video tape records. The optical systems are described, and representative results are presented. The potential of this instrumentation in flutter research is discussed

An analysis of the Mariner 4 photography of Mars

Crater analysis of Mariner 4 photography of Mar

High powered arc electrodes

Nonconsumable metal electric arc electrodes are described capable of being operated in a variety of gases at various pressures, current, and powers. The cathode has a circular annulus tip to spread the emission area for improved cooling

Land landing couch dynamics computer program

Computer programs perform landing stability studies of mechanical impact system designs for advanced spacecraft. The programs consider variation in spacecraft vertical and horizontal velocity, attitude and orientation, shock strut load-stroke characteristics, and ground coefficient of friction

Midinfrared spectral investigations of carbonates: Analysis of remotely sensed data

Recent airborne thermal infrared observations of Mars from the Kuiper Airborne Observatory (KAO) have provided evidence for the presence of carbonates, sulfates, and hydrates. Using the optical properties of calcite and anhydrite, it was estimated that CO3's and SO4's constituted about 1 to 3 and 10 to 15 wt. percent, repectively of the materials composing the atmospheric dust. Using the derived value as an estimate of total CO3 abundance, and making an assumption that the CO3's were uniformly distributed within the Martian regolith, it was estimated that such a CO3 reservoir could contain roughly 2 to 5 bars of CO2. While the results indicate that several volatile-bearing materials are present on Mars, the observations from the KAO are inherently limited in their ability to determine the spatial distributions of these materials. However, previous spacecraft observations of Mars provide both the spectral coverage necessary to identify these materials, as well as the potential for investigating their spatial variability. This has prompted us to pursue a reinvestigation of the Mariner 6 and 7 infrared spectrometer and Mariner 9 infrared interferometer spectrometer observations. The former data have been recently made available in digital format and calibration of wavelengths and intensities are almost complete. Additionally, we are pursuing the derivation of optical constants of more appropriate carbonates and sulfates

Project managers’ and change managers’ contribution to success

© 2016, © Emerald Group Publishing Limited. Purpose – Many projects involve an organisational change component. Project management (PM) and change management (CM) have the potential to jointly contribute to the delivery of organisational changes. However, there is a lack of clarity in the literature about the boundary and relationship between these disciplines. The purpose of this paper is to explore the contribution these disciplines make to a set of project critical success factors, to understand the ways that these disciplines can most effectively work together. Design/methodology/approach – This paper analyses data collected through an online survey, examining project managers’ and change managers’ perception of each disciplines’ contribution to critical success factors. The survey received 455 responses. Findings – This paper identifies the success factors that are most clearly influenced by PM and CM, and areas where practitioners of these disciplines hold significantly different perceptions of their contributions. The results have been used to rank and categorise success factors based on the influence of each discipline. This has been used to develop a risk-based questionnaire to guide the contribution of PM and CM to the mitigation of specific project risks. Originality/value – These findings will be of use to practitioners managing organisational change projects, or projects with a significant change component. The findings will be of assistance in determining the ways in which these disciplines should work together to mitigate risks associated with specific critical success factors