High-Resolution Ultrasonic Imaging of Artworks with Seismic Interferometry for Their Conservation and Restoration

Artworks are an inseparable part of the cultural heritage of societies and provide us with a unique look at cultural developments through time and space. For the best possible conservation, it is paramount to know the constituent materials, condition, and construction techniques of the objects (e.g. painting on wood, fresco, sculpture). Such information is required not only for the surfaces of the objects, but also for the interiors; in the imaging discipline, this is known as depth imaging. Here, we introduce a new method for non-invasive depth imaging as an alternative to traditional non-invasive methods when the latter cannot be used to obtain the required information. We use ultrasonic transverse-wave transmission measurements and turn them into virtual reflection measurements. We achieve this by applying seismic interferometry with active sources. Obtaining reflection measurements by seismic interferometry allows us to apply an advanced imaging technique – prestack depth migration, as used in seismic exploration – to produce a high-resolution depth image of an object. We apply our method to ultrasonic data recorded on a mockup of a painting on a wooden support. We validate our method by comparing our results with an image from X-ray computed tomography.     

Tracing the Sources

This article explores health journalists’ sourcing patterns in the Dutch-speaking part of Belgium across a range of different media including newspapers, magazines, radio, television and online health news websites. A cross-sectional quantitative content analysis of health news items collected in February 2015 (N?=?981) was established to examine the number and origin (e.g. industry, citizens, experts) of sources (N?=?1998) mentioned in health news stories with particular attention paid to differences across various media types. Despite recent claims of media convergence, cross-media comparisons are scarce and, for a specialized beat such as health, nonexistent. The key findings of this study indicate that ordinary citizens and academic experts constitute the two largest source categories. The small share of industry-related sources confirms journalists’ skeptical attitude towards content provided by the industry. But on closer inspection, large differences can be observed across various media types. On the one hand, ordinary citizens occur with relatively high frequency on television but hardly make an appearance in online news items. Academic sources, on the other hand, are dominant online but nearly absent in television news items. In sum, this analysis demonstrates that health journalists’ source uses differ across various media platforms.     

Designing hypermedia documentation for safety critical training applications

This paper discusses the requirements for authoring methodologies for large multimedia systems to be used for technical education documentation in the domain of 'safety critical' industries and presents work which contributes to the development of a methodology for their design. Such documentation is typically required to serve both for training purposes and for direct support of engineers in the field. This dual-purpose nature means that documents are typically complex with multiple navigation paths. The documentation used to train for and support maintenance and repair may itself be safety critical, in that incorrect documentation can lead to incorrect maintenance procedures. Research into 'industrial strength' hypermedia has tended to concentrate on the issues of robustness and data integrity, while the issues of design methodologies for such systems have not received as much attention. These issues include those of the verifiable correctness of such systems, both in terms of their content and other issues such as sequence of presentation. It is argued that the addressing of these issues is essential to the development of technical documentation systems that are of sufficient quality to be used for safety critical applications such as within the transport industry. The requirements that viable design methodologies for these applications must address are discussed, and a methodology is proposed, based on traditional authoring methods and process algebra-based formal specification and verification.     

Comparison of Activity Type Classification Accuracy from Accelerometers Worn on the Hip,Wrists, and Thigh in Young,Apparently Healthy Adults

The purpose of this article is to compare accuracy of activity type prediction models for accelerometers worn on the hip, wrists, and thigh. Forty-four adults performed sedentary, ambulatory, lifestyle, and exercise activities (14 total, 10 categories) for 3–10 minutes each in a 90-minute semi-structured laboratory protocol. Artificial neural networks (ANNs) were developed for four accelerometers (right hip, both wrists, and right thigh,) to predict individual activities and activity categories, with direct observation (DO) as criterion. The wrist-mounted accelerometers achieved the highest accuracy for individual activities (80.9%–81.1%) and activity categories (86.6%–86.7%); accuracy was not different between wrists. The hip-mounted accelerometer had the lowest accuracy (66.2% individual activities, 72.5% activity categories); thigh-mounted accelerometer accuracy (71.4% individual activities, 84.0% activity categories) fell between the wrist- and hip-mounted accelerometers. ANNs developed for accelerometers worn on the wrists and thigh provided high accuracy for activity type prediction and represent a potential approach to physical activity (PA) assessment.     

家的修复力

1 When Becky Rohrer rescued an abandoned wreck of a house and lovingly transformed it into a cozy inn, she ended up healing her life as well. Emotionally and spiritually, the distance she's traveled from the life she once lived to where she is today seems almost impossible to measure.……     

LATENCY‐AGED CHILDREN'S VIEWS OF AGING

This study investigated the contents of children's attitudes toward the elderly and compared these attitudes with the children's attitudes toward young people.

The Children's Views on Aging (CVOA) questionnaire was administered to 256 latency‐aged (8‐10 year‐old) children. The children were white and black, male and female, and came from both rural and urban backgrounds.

The children's responses to the CVOA were analyzed quantitatively using chi‐square and t‐tests. The results showed that children had some negative perceptions of the aging process, but positive views of the older person. Comparison of the children's attitudes toward older people and young people showed that the children's attitudes were more negative toward older people in the potency dimension of attitude but more positive toward older people in the evaluative dimension. The findings suggest that children's attitudes toward aging are complex and diverse. Important implications for educational practice are discussed.

This study formed part of Ronald Marks’ doctoral dissertation submitted to the Graduate Faculty of the School of Social Work, University of Pittsburgh, 1980.