1,568 research outputs found
Improving media fragment integration in emerging web formats
The media components integrated into multimedia presentations are typically entire files. At times the media component desired for integration, either as a navigation destination or as coordinate presentation, is a part of a file, or what we call a fragment. Basic media fragment integration has long been implemented in hypermedia systems, but not to the degree envisioned by hypermedia research. The current emergence of several XML-based formats is beginning to extend the possibilities for media fragment integration on a large scale. This paper presents a set of requirements for media fragment integration, describes how standards currently meet some of these requirements and proposes extensions to these standards for meeting remaining requirements
Highly efficient frequency triplers in the millimeter wave region incorporating a back-to-back configuration of two varactor diodes
This paper reports on the recent development of monolithic frequency tripler array employing a back-to-back configuration of varactor diodes. Even harmonic idler
circuits are unnecessary in this design. Furthermore, no external dc bias is required. The arrangement results in highly efficient, easily-fabricated and inexpensive frequency triplers
Virtual context - relating media objects to their real world subjects
Virtual Reality (VR) is sometimes used to give the user an immersive, three-dimensional sense of a real-world setting. VR is also sometimes used for information visualization, taking advantage of the perceptual characteristics of VR to convey information. This paper presents the Dam Square Virtual Context, a Web-based VR that is a combination of both these uses. This VR presents mock-ups of both Dam Square in the city of Amsterdam and the city's largest museum, the Rijksmuseum. This VR conveys abstract information that includes the relationships between objects in the museum, such as paintings of Amsterdam cityscapes, and the corresponding objects in Dam Square itself, such as the buildings and neighborhoods shown in these paintings. It is thus a multimedia combining VR wireframes and bitmaps with still images and interface scripts. The principle behind this is that the user learns how to walk through the museum to view objects that together convey a unified view about Amsterdam, which the user can then later walk through
Work-related psychological health and psychological type among lead elders within the Newfrontiers network of churches in the United Kingdom
Building on a series of recent studies concerned with assessing work-related psychological health and psychological type among various groups of church leaders, this study reports new data provided by 134 Lead Elders within the Newfrontiers network of churches in the United Kingdom who completed the Francis Psychological Type Scales (FPTS) together with the two scales of the Francis Burnout Inventory (FBI) concerned with emotional exhaustion and satisfaction in ministry. Compared with other groups of church leaders, Lead Elders within the Newfrontiers network of churches reported lower levels of emotional exhaustion and higher levels of satisfaction in ministry. Compared with other groups of church leaders, there was a higher proportion of extraverts among Lead Elders within the Newfrontiers network of churches. There was only a weak association between psychological type and burnout
The X-ray Spectrum of the Rapid Burster using the Chandra HETGS
We present observations of the Rapid Burster (RB, also known as MXB 1730-335)
using the Chandra High Energy Transmission Grating Spectrometer. The average
interval between type II (accretion) bursts was about 40 s. There was one type
I (thermonuclear flash) burst and about 20 "mini-bursts" which are probably
type II bursts whose peak flux is 10-40% of the average peak flux of the other
type II bursts. The time averaged spectra of the type II bursts are well fit by
a blackbody with a temperature of kT = 1.6 keV, a radius of 8.9 km for a
distance of 8.6 kpc, and an interstellar column density of 1.7e22 per sq. cm.
No narrow emission or absorption lines were clearly detected. The 3 sigma upper
limits to the equivalent widths of any features are < 10 eV in the 1.1-7.0 keV
band and as small as 1.5 eV near 1.7 keV. We suggest that Comptonization
destroys absorption features such as the resonance line of Fe XXVI.Comment: 10 pages, 4 figures, accepted for publication in AJ (with minor
changes and enhanced discussion of the instrument configuration
Models of crustal heating in accreting neutron stars
Heating associated with non-equilibrium nuclear reactions in accreting
neutron-star crusts is reconsidered, taking into account suppression of
neutrino losses demonstrated recently by Gupta et al. Two initial compositions
of the nuclear burning ashes, A=56 and A=106, are considered. Dependence of the
integrated crustal heating on uncertainties plaguing pycnonuclear reaction
models is studied.
One-component plasma approximation is used, with compressible liquid-drop
model of Mackie and Baym to describe nuclei. Evolution of a crust shell is
followed from 10^8 g/cm^3 to 10^(13.6) g/cm^3
The integrated heating in the outer crust agrees nicely with results of
self-considtent multicomponent plasma simulations of Gupta et al.; their
results fall between our curves obtained for A=56 and A=106. Total crustal heat
per one accreted nucleon ranges between 1.5 MeV to 1.9 MeV for A=106 and A=56,
respectively. The value of total crustal heat per nucleon depends weakly on the
presence of pycnonuclear reactions at densities 10^(12)-10^(13) g/cm^3.
Remarkable insensitivity of the total crustal heat on the details of the
distribution of nuclear processes in accreted crust is explained.Comment: 8 pages, 5 figures, Submitted to A&
The Link vs. the Event: Activating and Deactivating Elements in Time-Based Hypermedia
Activation and deactivation of media items plays a fundamental role in the playing of multimedia and time-based hypermedia presentations. Activation and deactivation information thus has to be captured in an underlying document format. In this paper we show that a number of aspects of activation and deactivation information can be captured using both link structures and events in time-based hypermedia. In particular, we discuss how deactivation and activation can be specified, how the activations and deactivations can be initiated and potential (synchronization) relationships between the elements involved. We first introduce the notions of time-based scheduling and event-based scheduling and then present a short summary of linking. We discuss the similarities between event-based scheduling and linking. We describe a number of aspects of activation and deactivation that can be specified within a document. We then discuss how activation and deactivation information can be recorded in link structures and events
Be Your Own Curator with the CHIP Tour Wizard [html]
Web 2.0 enables increased access to the museum digital
collection. More and more, users will spend time preparing
their visits to the museums and reflecting on them after the
visits. In this context, the CHIP (Cultural Heritage
Information Personalization) project offers tools to the
users to be their own curator, e.g. planning a personalized
museum tour, discovering interesting artworks they want to
see in a 'virtual' or a 'real' tour and quickly finding their
ways in the museum. In this paper we present the new
additions to the CHIP tools, which target the above
functionality - a Web-based Tour Preparation Wizard and
an export of a personalized tour to an interactive Mobile
Guide used in the physical museum space. In addition, the
user interactions during a real museum visit are stored and
synchronized with the user model, which is maintained at
the museum Web site
Be Your Own Curator with the CHIP Tour Wizard [pdf]
Web 2.0 enables increased access to the museum digital
collection. More and more, users will spend time preparing
their visits to the museums and reflecting on them after the
visits. In this context, the CHIP (Cultural Heritage
Information Personalization) project offers tools to the
users to be their own curator, e.g. planning a personalized
museum tour, discovering interesting artworks they want to
see in a 'virtual' or a 'real' tour and quickly finding their
ways in the museum. In this paper we present the new
additions to the CHIP tools, which target the above
functionality - a Web-based Tour Preparation Wizard and
an export of a personalized tour to an interactive Mobile
Guide used in the physical museum space. In addition, the
user interactions during a real museum visit are stored and
synchronized with the user model, which is maintained at
the museum Web site
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