The 18/30 GHz fixed communications system service demand assessment. Volume 1: Executive summary

The total demand for voice, video, and data communications services, and satellite transmission services at the 4/6 GHz, 12/14 GHz, and 18/30 GHz frequencies is discussed. Major study objectives, overall methodology, results, and general observations about a satellite systems market characteristics and trends are summarized

Innovative concepts for aerodynamic control of wind turbine rotors

New systems for the aerodynamic control of wind turbine rotors are being studied in various projects funded by the UK Department of Energy. Results from a current project, ongoing at the National Wind Turbine Test Centre (NWTC) in Scotland are presented. These systems show the promise of much cheaper and more affective active control of horizontal axis wind turbines than has been achieved with full span and partial span pitching systems

The 30/20 GHz fixed communications systems service demand assessment. Volume 3: Appendices

The market analysis of voice, video, and data 18/30 GHz communications systems services and satellite transmission services is discussed. Detail calculations, computer displays of traffic, survey questionnaires, and detailed service forecasts are presented

The spin vector of Venus determined from Magellan data

A control network of the north polar region of Venus has been established by selecting and measuring control points on full-resolution radar strips. The measurements were incorporated into a least-squares adjustment program that improved initial estimates of the coordinates of the control points, pole direction, and rotation rate of Venus. The current dataset contains 4206 measurements of 606 points on 619 radar strips. The accuracy of the determination is driven by spacecraft ephemeris errors. An accurate estimate of the rotation period of Venus was obtained by applying an ephemeris improvement technique. The second cycle closure orbits improved ephemeris solutions for 40 orbits (376-384, 520-528, 588-592, 658-668, 1002-1010, 1408-1412, 1746-1764, and 2166-2170) are included and fixed in the geodetic control computations, thus trying the network to the J2000 coordinate system

Into the Wilds: Influences from Video Games on Our Perception of \u27Nature\u27

In this paper I examine how representations of human-sparse natural environments, e.g. wilderness, influence what expectations we have when we actually engage with comparable physical places. I use Don Ihde\u27s phenomenology of technology to describe my own experiences playing three games that take place among large photorealistic human-sparse natural environments: Elder Scrolls V: Skyrim, Horizon Zero Dawn, and theHunter: Call of the Wild. I also conduct a brief literature review on the effects of video games as interactive media on players. I argue that players are capable of applying their expectations of what constitutes realism from digital to physical environments, and that some of these translocations (transferring the perceptual framework from one space to another) limit our ability to meaningfully engage with the world. Although some video games may condition players to hyperreal expectations that leave them disappointed with physical spaces, some games might also produce increased interest and care for human-sparse spaces. The causal relationship between playing video games, changing expectations, and offline behavior therefore merits further study. I conclude with the claim that our experiences with unmediated physical nature should ground our perceptual baselines, rather than evaluating the physical by the standards of the digital

In Memoriam

Obituary of David Demaree Banta, published in the Arbutus Yearboo

In Memoriam

Obituary of David Demaree Banta, published in the Arbutus Yearbook and authored by Dean William Perry Rogers

Gauge fixing and equivariant cohomology

The supersymmetric model developed by Witten to study the equivariant cohomology of a manifold with an isometric circle action is derived from the BRST quantization of a simple classical model. The gauge-fixing process is carefully analysed, and demonstrates that different choices of gauge-fixing fermion can lead to different quantum theories.Comment: 18 pages LaTe