Non-linear shipboard shock analysis of the Tomahawk missile shock isolation system

The identification, quantification, computer modeling and verification of the Tomahawk nonlinear liquid spring shock isolation system in a surface ship Vertical Launch System (VLS) are discussed. The isolation system hardware and mode of operation is detailed in an effort to understand the nonlinearities. These nonlinearities are then quantified and modeled using the MSC/NASTRAN finite element code. The model was verified using experimental data from the Navel Ordnance Systems Center MIL-S-901 medium weight shock tests of August 1986. The model was then used to predict the Tomahawk response to the CG-53 USS Mobile Bay shock trials of May-June 1987. Results indicate that the model is an accurate mathematical representation of the physical system either functioning as designed or in an impaired condition due to spring failure

Microstructural evolution of Au/TiO2 nanocomposite films: The influence of Au concentration and thermal annealing

Nanocomposite thin films consisting of a dielectric matrix, such as titanium oxide (TiO2), with embedded gold (Au) nanoparticles were prepared and will be analysed and discussed in detail in the present work. The evolution of morphological and structural features was studied for a wide range of Au concentrations and for annealing treatments in air, for temperatures ranging from 200 to 800 °C. Major findings revealed that for low Au atomic concentrations (at.%), there are only traces of clustering, and just for relatively high annealing temperatures, T ≥ 500 °C. Furthermore, the number of Au nanoparticles is extremely low, even for the highest annealing temperature, T = 800 °C. It is noteworthy that the TiO2 matrix also crystallizes in the anatase phase for annealing temperatures above 300 °C. For intermediate Au contents (5 at.% ≤ CAu ≤ 15 at.%), the formation of gold nanoclusters was much more evident, beginning at lower annealing temperatures (T ≥ 200 °C) with sizes ranging from 2 to 25 nm as the temperature increased. A change in the matrix crystallization from anatase to rutile was also observed in this intermediate range of compositions. For the highest Au concentrations (> 20 at.%), the films tended to form relatively larger clusters, with sizes above 20 nm (for T ≥ 400 °C). It is demonstrated that the structural and morphological characteristics of the films are strongly affected by the annealing temperature, as well as by the particular amounts, size and distribution of the Au nanoparticles dispersed in the TiO2 matrix.This research is sponsored by FEDER funds through the programme COMPETE – Programa Operacional Factores de Competitividade – and by national funds through FCT – Fundação para a Ciência e a Tecnologia –, under the projects PEST-C/FIS/UI607/2013 and PEst-C/EME/UI0285/2013. The authors also acknowledge the financial support by the European Project Nano4Color — Design and develop a new generation of color PVD coatings for decorative applications (FP7 EC R4SME Project No. 315286)

<i>SnapCap</i> smartphone application flow.

<p>The application is launched prior to each patient encounter.</p

Raw photos taken by nurses with SnapCap exemplifying photo-taking challenges.

<p>Raw photos taken by nurses with SnapCap exemplifying photo-taking challenges.</p

Normalized diference between the sum of ranks for application preferences.

<p>Nurses’ preferences when comparing SnapCap and Epic Haiku for wound photography as given by the normalized difference between the sum of ranks for application preferences. A value of +1 indicates that all participants preferred the SnapCap functionality, while a value of -1 that all participants preferred the Epic Haiku functionality.</p

SnapCap prototype system architecture, including Google speech-to-text transcription.

<p>The present SnapCap architecture is for prototyping use only. Hospital implementation for routine clinical care would require encrypted communication channels and an interface with proprietary data storage to ensure privacy and security. Ultimately, we intend SnapCap to be platform-agnostic and compatible with a range of EMR systems.</p

Pilot study participant using SnapCap.

<p>Pilot study participant using SnapCap.</p

The <i>SnapCap</i> System.

<p><i>SnapCap</i> is a mobile hands-free application for capturing, tagging, and transferring digital images to a patient’s medical record through leveraging the camera and internal sensors of the Glass wearable computing device (right). A pilot study participant (left) uses both hardware elements of SnapCap, Google Glass and an Android smartphone application, for hands-free wound photography.</p