Automated Propulsion Data Screening demonstration system

A fully-instrumented firing of a propulsion system typically generates a very large quantity of data. In the case of the Space Shuttle Main Engine (SSME), data analysis from ground tests and flights is currently a labor-intensive process. Human experts spend a great deal of time examining the large volume of sensor data generated by each engine firing. These experts look for any anomalies in the data which might indicate engine conditions warranting further investigation. The contract effort was to develop a 'first-cut' screening system for application to SSME engine firings that would identify the relatively small volume of data which is unusual or anomalous in some way. With such a system, limited and expensive human resources could focus on this small volume of unusual data for thorough analysis. The overall project objective was to develop a fully operational Automated Propulsion Data Screening (APDS) system with the capability of detecting significant trends and anomalies in transient and steady-state data. However, the effort limited screening of transient data to ground test data for throttle-down cases typical of the 3-g acceleration, and for engine throttling required to reach the maximum dynamic pressure limits imposed on the Space Shuttle. This APDS is based on neural networks designed to detect anomalies in propulsion system data that are not part of the data used for neural network training. The delivered system allows engineers to build their own screening sets for application to completed or planned firings of the SSME. ERC developers also built some generic screening sets that NASA engineers could apply immediately to their data analysis efforts

Space and Time in Macroeconomic Panel Data: Young Workers and State-Level Unemployment Revisited

A provocative paper by Shimer (2001) finds that state-level youth shares and unemployment rates are negatively correlated, in contrast to conventional assumptions about demographic effects on labor markets. This paper updates Shimer's regressions and shows that this surprising correlation essentially disappears when the end of the sample period is extended from 1996 to 2005. This shift does not occur because of a change in the underlying economy during the past decade. Rather, the presence of a cross-sectional (that is, spatial) correlation in the state-level data sharply reduces the precision of the earlier estimates, so that the true standard errors are several times larger than those originally reported. Using a longer sample period and some controls for spatial correlation in the regression, point estimates for the youth-share effect on unemployment are positive and close to what a conventional model would imply. Unfortunately, the standard errors remain very large. The difficulty of obtaining precise estimates with these data illustrates a potential pitfall in the use of regional panel data for macroeconomic analysis

An Analysis of the Employment Effects of the Washington High Technology Business and Occupation (B&O) Tax Credit: Technical Report

This paper estimates the effects of an R&D tax credit in the state of Washington on job creation. The research uses micro-data on the job creation and tax credits received by individual firms in the state of Washington from 2004 to 2009. We correct for the endogeneity of R&D tax credits received by individual firms by using instrumental variables based in part on national industry factor shares for R&D. We estimate that this tax credit created jobs, but at a high cost. The cost per job-year created is estimated to be between $40,000 and$50,000. The credit was so high cost in part because the credit was non-refundable. As a result, about one-quarter of the firms receiving credits were maxed out on credit eligibility, so that the credit provided no marginal incentive for additional R&D spending or job creation

Geckos decouple fore- and hind limb kinematics in response to changes in incline

This work is supported by an NSF grant (NSF IOS-1147043) to TE

Severe traumatic injury during long duration spaceflight: Light years beyond ATLS

Traumatic injury strikes unexpectedly among the healthiest members of the human population, and has been an inevitable companion of exploration throughout history. In space flight beyond the Earth's orbit, NASA considers trauma to be the highest level of concern regarding the probable incidence versus impact on mission and health. Because of limited resources, medical care will have to focus on the conditions most likely to occur, as well as those with the most significant impact on the crew and mission. Although the relative risk of disabling injuries is significantly higher than traumatic deaths on earth, either issue would have catastrophic implications during space flight. As a result this review focuses on serious life-threatening injuries during space flight as determined by a NASA consensus conference attended by experts in all aspects of injury and space flight

Vampires in the village Žrnovo on the island of Korčula: following an archival document from the 18th century

Središnja tema rada usmjerena je na raščlambu spisa pohranjenog u Državnom arhivu u Mlecima (fond: Capi del Consiglio de’ Dieci: Lettere di Rettori e di altre cariche) koji se odnosi na događaj iz 1748. godine u korčulanskom selu Žrnovo, kada su mještani – vjerujući da su se pojavili vampiri – oskvrnuli nekoliko mjesnih grobova. U radu se podrobno iznose osnovni podaci iz spisa te rečeni događaj analizira u širem društvenom kontekstu i prate se lokalna vjerovanja.The main interest of this essay is the analysis of the document from the State Archive in Venice (file: Capi del Consiglio de’ Dieci: Lettere di Rettori e di altre cariche) which is connected with the episode from 1748 when the inhabitants of the village Žrnove on the island of Korčula in Croatia opened tombs on the local cemetery in the fear of the vampires treating. This essay try to show some social circumstances connected with this event as well as a local vernacular tradition concerning superstitions

Analytical pedestrian accident reconstruction using computer simulation. Final report.

Mode of access: Internet.Author corporate affiliation: National Highway Traffic Safety Administration, Vehicle Research and Test Center, East Liberty, OhioSubject code: EMSubject code: EM*ECSubject code: JLMSubject code: WNBFSubject code: WNBJSubject code: WSM*NLSISubject code: XMCSubject code: XM

Experimental pedestrian accident reconstructions - head impacts. Final report.

Mode of access: Internet.Author corporate affiliation: National Highway Traffic Safety Administration, Vehicle Research and Test Center, East Liberty, OhioSubject code: DGCLSubject code: EMSubject code: JLMSubject code: JLTSubject code: OAISubject code: WNBFSubject code: WSM*NLSISubject code: XM

Responses to the Vatican Document: Consecrated Persons and Their Mission in Schools

To advance the discussion and study of this most recent document, the editors invited select Catholic educators to offer reflections, observations, and critiques of Consecrated Persons and Their Mission in Schools. While each contributor responds from an individual background and a unique set of experiences, the following essays help us to appreciate how the document is being received and interpreted in different educational settings