Vibration Responses of Test Structure No. 2 During the Edward Air Force Base Phase of the National Sonic Boom Program

In order to evaluate reaction of people to sonic booms of varying overpressures and time durations, a series of closely controlled and systematic flight tests/studies were conducted from June 3 to June 23, 1966. The dynamic responses of several building structures were measured, with emphasis on a two-story residence structure. Sample acceleration and strain recordings from F-104, B-58, and XB-70 sonic boom exposures are included, along with tabulations of the maximum acceleration and strain values measured for each one of about 140 flight tests. These data are compared with similar measurements for engine noise exposures of the building during simulated landing approaches and takeoffs of KC-135 aircraft

Vibration responses of test structure no. 1 during the Edwards Air Force Base phase of the national sonic boom program

In order to evaluate reaction of people to sonic booms of varying overpressures and time durations, a series of closely controlled and systematic flight test studies were conducted in the vicinity of Edwards AFB, California, from June 3 to June 23, 1966. The dynamic responses of several building structures were measured as a part of these studies, and the measurements made in a one-story residence structure (Edwards test structure No. 1) are presented. Sample acceleration and strain recordings are presented from F-104, B-58, and XB-70 sonic-boom exposures, along with tabulations of the maximum acceleration and strain values measured for each one of about 140 flight tests. These data are compared with similar measurements for engine noise exposures of the building during simulated landing approaches and takeoffs of KC-135 aircraft

Seasonal Adjustment Methods and the Determination of Turning Points of the EMU Business Cycle

In this paper, we investigate the impact of the adjustment for seasonal effects with different seasonal adjustment methods, the possible pre-treatment for calendar effects and the different order of aggregation and adjustment for the determination of the turning points of the European business cycle. The European business cycle is represented first by the GDP series (referring to the classical definition of a business cycle as fluctuations in the level of economic activity), and then by deviations from trend (which corresponds to the definition of the cycle as changing capacity utilisation). The turning points are determined using a mechanical procedure (Bry/Boschan methodology), which ensure that all series are treated alike. The comparison of turning points in the classical and growth cycles has brought the following results: 1.The order of seasonal adjustment and aggregation has only minor effects on the determined turning points of the European business cycle. 2.If the series are pretreated for calendar effects, turning points in the aggregated series can differ significantly. 3.It is not relevant whether the series were adjusted with a single method or with different methods (mixed aggregates)

Rationalizing Disaster: Assessing the physical, economic, and cultural impact of natural hazards in Luzon, 1645-1754

This dissertation asserts historic natural hazards and the disasters they created are a potent and flexible analytical tool for studying the Philippine archipelago during the mid-colonial period (ca. 1640-1764). Historic hazards, because they occurred in the islands with sufficient regularity in the seventeenth and eighteenth centuries, were not just discrete, disruptive events, but processes that acted over time. These hazards, when viewed as processes, illustrate how a colonial society altered and adapted itself to cope with prolonged disruptions. When comprehended as events, though, responses to individual natural hazards identify the central connections and tensions that defined the colonial Philippines at the moment of disruption. Therefore, this dissertation employs both perspectives to study the physical, economic, and cultural impact of natural hazards in Spanish Luzon between 1645 and 1754, years defined by the most severe disasters experienced in the islands in their respective centuries. By treating each hazard that transpired in the 109-year period as separate events, the dissertation demonstrates how seismic and meteorological hazards threatened crucial assets of the Spanish Empire, including galleons, fortresses, and churches. The dissertation also identifies how individual hazards amplified the growing poverty of the Philippine colony in the seventeenth century. By treating the same destructive events as a process, the dissertation shows the evolving responses of governing institutions—colonial administrators and members of the clergy—to natural hazards over time. These institutional adaptations are reflected in the ways narratives of disaster shared amongst the colony’s literate, Spanish elite changed between 1645 and 1754 to emphasize hazards’ capacity for destruction over their supposed metaphysical causes. Lastly, through case studies on folk magic and the creolization of Catholic festivals, the dissertation explores how Spanish soldiers and the colonized indigenous peoples of Luzon perceived natural hazards respectively

Cultivating Wheat in the Philippines, ca. 1600–1800 CE: why a grain was not adopted by local populations

Studying why newly introduced cultivars fail to make inroads with local populations is notoriously difficult, as these “rejected” crops often leave little or no physical evidence. Taking advantage of unusually ample historical documentation, this paper studies wheat’s introduction, dispersal, and sporadic cultivation in the Philippine archipelago, with an emphasis on the period between 1640 and 1670 CE when sustained wheat cultivation began near Manila. Using documents and comparisons to other cultivars imported during the Pacific Columbian Exchange, the paper identifies several independent barriers to wheat’s cultivation, all of which aligned to ensure wheat was never widely farmed by local populations.Introduction Wheat in the Philippines and Historical Archaeology Archival Evidence: Wheat Cultivation 1600–1800 CE Why Not Wheat? Discussion and Conclusio

Comparison of measured and calculated aircraft lift generated pressures

Lift generated pressures produced by large, heavy aircraft at low altitudes were investigated due to concern over their possible effects on ground objects. Aircraft lift generated pressures were calculated using elementary airfoil theory, and these values were compared with ground level measurements made during an overflight program. The predicted and the measured values were in relatively good agreement. Due to lack of experimental investigations of this phenomenon, opportunity was taken during an overflight program to use a specially instrumented test range to measure the ground pressures produced for a range of aircraft weights and distances

Constructing seasonally adjusted data with time-varying confidence intervals

Seasonal adjustment methods transform observed time series data into estimated data, where these estimated data are constructed such that they show no or almost no seasonal variation. An advantage of model-based methods is that these can provide confidence intervals around the seasonally adjusted data. One particularly useful time series model for seasonal adjustment is the basic structural time series [BSM] model. The usual premise of the BSM is that the variance of each of the components is constant. In this paper we address the possibility that the variance of the trend component in a macro-economic time series in some way depends on the business cycle. One reason for doing so is that one can expect that there is more uncertainty in recession periods. We extend the BSM by allowing for a business-cycle dependent variance in the level equation. Next we show how this affects the confidence intervals of seasonally adjusted data. We apply our extended BSM to monthly US unemployment and we show that the estimated confidence intervals for seasonally adjusted unemployment change with past changes in the oil price