Late Morning Concurrent Sessions: Innovations in Aviation Technologies: Presentation: Relative Material Loss: A Methodology for Assessing Island Airport Steel Marine Bulkheads

A July 2015 report from the Airports Council International – North America (ACI-NA) states “U.S. airports are long overdue for [a] major structural improvement projects. Most U.S. airports are aging, … and because of budgetary restrictions, they’re not aging well.”(Garcia and Clampet, 2015). The average US age is 40 years old with the youngest (Denver International) recently turning 20 years old. As airports continue to age, airport commissioners will struggle to find creative ways to either fund airport replacements or extend the service life of existing airport facilities (commonly referred to as service life extension projects or SLEP). Due to budgetary constraints, the call for more SLEP projects is expected to increase, driving industries to require more in depth inspection and baseline documentation methodologies (Melchers, 2015). This is especially true for the airport industry where steel marine structures such as cellular cofferdam and steel pile bulkheads are being used for island airport construction and expansion (Myscienceacademy, 2013). The use of these structural marine systems is expected to rise as more airports are constructed off shore to resolve regional urban encroachment and space limitations problems around existing airport facilities. The slide presentation will focus on a methodology called Relative Material Loss (RML) which is a maintenance inspection technique proposed for approximating material loss on in-service island airport marine bulkheads such as cellular cofferdam and sheet pile systems. The modelling technique suggests that by defining numerous relative loss (RL) equations across various structural boundaries and into various defined homogeneously environments, material thinning on both sides of the steel material can be approximated which adds value to determining service life (Ernsting, et al., 2010). When incorporated with scholarly probabilistic corrosion modeling (Melchers, 2015), RML offers a promising frame work for further problem constraint and improving structural assessment knowledge. References Garcia, M., & Clampet, J. (2015, July 29), What Will It Take to Bring U.S. Airports Into the Future? Only $4. Retrieved from www.skift.com. http://skift.com/2015/07/29/what-will-it-take-to-bring-u-s-airports-into-the-future-only-4/ Melchers, R. E. (2015). Using models to interpret data for monitoring and life prediction of deteriorating infrastructure systems. Structure and Infrastructure Engineering, 11(1), 63-72. Myscienceacademy. (2013, September 12), 11 Incredible Island Airports. Retrieved from myscienceacademy.org. http://myscienceacademy.org/2013/09/12/11-incredible-island-airports/ Ernsting, R. A., Mazzuchi, T. A., & Sarkani, S. (2010). Relative material Loss—A methodology for approximating material loss on structural plating separating dissimilar marine environments. Paper presented at the Ports 2010. 12th Triannual International Conference. Building on the Past, Respecting the Future

Spectrally narrow, long-term stable optical frequency reference based on a Eu3+^{3+}:Y2_{2}SiO5_{5} crystal at cryogenic temperature

Using an ultrastable continuous-wave laser at 580 nm we performed spectral hole burning of Eu$^{3+}$:Y$_{2}$SiO$_{5}$ at very high spectral resolution. Essential parameters determining the usefulness as a "macroscopic" frequency reference: linewidth, temperature sensitivity, long-term stability were characterized, using a H-maser stabilized frequency comb. Spectral holes with linewidth as low as 6 kHz were observed and the upper limit of the drift of the hole frequency was determined to be on the order of 5$\pm$3 mHz/s. We discuss necessary requirements for achieving ultra-high-stability in laser frequency stabilization to these spectral holes.Comment: 4 pages, 4 figure

HDArray: Parallel Array Interface for Distributed Heterogeneous Devices

Heterogeneous clusters with nodes containing one or more accelerators, such as GPUs, have become common. While MPI provides a mechanism and management of interaddress space communication, and OpenCL provides a way to manage computation and communication within a process with access to heterogeneous computational resources, programmers are forced to write hybrid programs that manage the interaction of both of these systems. This paper describes an array programming interface that provides users with automatic or manual distributions of data and work. Using the distribution and information about what data is used and defined by kernels, communication among processes and among devices in a process is performed automatically. The interface provides a unified programming model to the user, thus simplifying program development

Demonstration of a Transportable 1 Hz-Linewidth Laser

We present the setup and test of a transportable clock laser at 698 nm for a strontium lattice clock. A master-slave diode laser system is stabilized to a rigidly mounted optical reference cavity. The setup was transported by truck over 400 km from Braunschweig to D\"usseldorf, where the cavity-stabilized laser was compared to a stationary clock laser for the interrogation of ytterbium (578 nm). Only minor realignments were necessary after the transport. The lasers were compared by a Ti:Sapphire frequency comb used as a transfer oscillator. The thus generated virtual beat showed a combined linewidth below 1 Hz (at 1156 nm). The transport back to Braunschweig did not degrade the laser performance, as was shown by interrogating the strontium clock transition.Comment: 3 pages, 4 figure

Language modeling approaches to blog post and feed finding

Language modeling approaches to blog post and feed finding Ernsting, B.J.; Weerkamp, W.; de Rijke, M. General rights It is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulations If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: https://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. In the opinion task we looked at the differences in performance between Indri and our mixture model, the influence of external expansion and document priors to improve opinion finding; results show that an out-of-the-box Indri implementation outperforms our mixture model, and that external expansion on a news corpus is very benificial. Opinion finding can be improved using either lexicons or the number of comments as document priors. Our approach to the feed distillation task is based on aggregating post-level scores to obtain a feed-level ranking. We integrated time-based and persistence aspects into the retrieval model. After correcting bugs in our post-score aggregation module we found that time-based retrieval improves results only marginally, while persistence-based ranking results in substantial improvements under the right circumstances

Exercise Stress Testing in Children with Metabolic or Neuromuscular Disorders

The role of exercise as a diagnostic or therapeutic tool in patients with a metabolic disease (MD) or neuromuscular disorder (NMD) is relatively underresearched. In this paper we describe the metabolic profiles during exercise in 13 children (9 boys, 4 girls, age 5–15 yrs) with a diagnosed MD or NMD. Graded cardiopulmonary exercise tests and/or a 90-min prolonged submaximal exercise test were performed. During exercise, respiratory gas-exchange and heart rate were monitored; blood and urine samples were collected for biochemical analysis at set time points. Several characteristics in our patient group were observed, which reflected the differences in pathophysiology of the various disorders. Metabolic profiles during exercises CPET and PXT seem helpful in the evaluation of patients with a MD or NMD

Exercise Stress Testing in Children with Metabolic or Neuromuscular Disorders

The role of exercise as a diagnostic or therapeutic tool in patients with a metabolic disease (MD) or neuromuscular disorder (NMD) is relatively underresearched. In this paper we describe the metabolic profiles during exercise in 13 children (9 boys, 4 girls, age 5–15 yrs) with a diagnosed MD or NMD. Graded cardiopulmonary exercise tests and/or a 90-min prolonged submaximal exercise test were performed. During exercise, respiratory gas-exchange and heart rate were monitored; blood and urine samples were collected for biochemical analysis at set time points. Several characteristics in our patient group were observed, which reflected the differences in pathophysiology of the various disorders. Metabolic profiles during exercises CPET and PXT seem helpful in the evaluation of patients with a MD or NMD