Structural Health Monitoring of M1114 High Mobility Multipurpose Wheeled Vehicle Armor System

The M1114 High Mobility Multipurpose Wheeled Vehicle (HMMWV) has been the workhorse vehicle of the U.S. Armed Forces in Afghanistan and Iraq. Donald Rumsfeld, Secretary of Defense, was faced with massive public criticism in 2004 for not equipping our military personnel in Afghanistan and Iraq with M1114s that had the proper ballistic armor. In May 2004, a $618M Senate Bill was passed to increase the production level of HMMWVs and improve their ballistic protection capabilities while minimizing additional weight. While the military is taking advantage of using composite armor on the HMMWV, it does not have a rigorous method to detect, locate, and quantify damage on a two-layer composite armor system. Structural Health Monitoring (SHM) is the process of implementing a damage detection and characterization strategy for engineering structures. Damage is defined as changes to the material and geometric properties of a structural system, including changes to boundary conditions and system connectivity, which adversely affect the system\u27s performance. An active SHM system was developed to detect, locate, and quantify damage on a two-layer composite armor (HJ1 composite with ceramic frontal plates) that encounters impact from a 0.30 caliber armor piercing projectile. An adaptive version of a one-at-a-time experiment was used during this research. Base line testing was performed to provide information on the structural properties and wave propagation characteristics of the material. Ballistic testing was completed to replicate David Fecko\u27s experiment of maximum V50 velocity of 947 meters per second and a ceramic-to-composite ratio of 60/40

Pengaruh Ukuran Perusahaan, Ukuran Dewan Komisaris, Profitabilitas Dan Leverage Terhadap Pengungkapan Tanggung Jawab Sosial Pada Perusahaan Manufaktur Yang Terdaftar Di Bei

This study aims to obtain empirical evidence of the effect of firm size, the size of the board of commissioners, profitability and leverage on the disclosure of social responsibility in manufacturing companies on the Stock Exchange in 2009-2011, as well as answers to some of the results of previous research gaps regarding the effect of firm size, the size of the board of commissioners , profitability and leverage on the disclosure of corporate social responsibility.This study uses financial statement data of manufacturing firms during the period 2009-2011. Analysis tools are used to examine the effect of the variables in this study were the F test (ANOVA) for simultaneous testing of multiple regression equations and partial t test to test each variable X to variable Y. Besides, to see how much the contribution of each variable used Adjusted R square. Overall analysis using SPPS program.The results showed that of the test or ANOVA F test, indicating the size of the company, the size of the board of commissioners, profitability and simultaneously leverage effect on social responsibility disclosure in manufacturing companies on the Stock Exchange in 2009-2011 with 95% confidence level. Then from the partial test results using the t test is known that only firm size and profitability have a significant influence on the disclosure of social responsibility, while the size of the board of commissioners and leverage does not have a significant effect on the disclosure of social responsibility. This research is  expected to provide an overview and understanding of the relationship of corporate social responsibility disclosure

Pengaruh Kebijakan Dividen, Likuiditas, Net Profit Margin, Return on Equity, Dan Price to Book Value Terhadap Harga Saham Pada Perusahaan Manufaktur Yang Terdaftar Di Bursa Efek Indonesia 2010 – 2013

This research aimed to analyze the effect of Dividend Policy, Liquidity,NPM, ROE, and PBV on stock prices of manufacturing companies in 2010 – 2013.Samples were manufacturing companies that listed in Indonesia Stock Exchange in2010 – 2013. This research uses 72 data with 18 selected companies per year. Theanalysis tool used in this research is multiple linear regression using SPSS computerprogram version 21.0. The results show that Dividend Policy, Liquidity, NPM, ROE,and PBV jointly have significantly affected the stock price. Partially, Dividend Policyhave significantly affected the stock price, whereas Liquidity, NPM, ROE, and PBVhave not significantly affected the stock price

Optimum design of cold-formed steel portal frame buildings including joint effects and secondary members

In steel portal frames, cold-formed steel channel sections are increasingly used as the primary framing components, in addition to the secondary members e.g. purlins and side rails. For such framing systems, the stiffness of the joints at the eaves and apex affects the bending moment distribution, as well as the frame deflections. This paper investigates the influence of two joint configurations having full rigidity and semirigidity, respectively, on the optimum design of cold-formed steel portal frames. A real-coded genetic algorithm is used to search for the most cost-effective design. It is shown that through incorporating joint effects explicitly into the design process, a more appropriate balance between the joints and the member properties can be obtained, thus optimizing material use. The study then investigates the effect of secondary members on the optimum design. It is shown that incorporating the secondary members is important for portal frames having spans less than 12 m. For example, for a frame spacing less than 6 m, the material cost of the primary members can be reduced by up to 15%

Waste Water Treatment with Conventional Materials (Chlorine, Aluminium Sulphate, Polyelectrolyte) as Well as Local Materials (Activated Charcoal and Burnt Bricks) in Makurdi Benue State Nigeria: A Comparative Study

Used water from restaurants hands and utensils washing was collected for pilot treatment. Red burnt bricks known to contain a small amount of iron oxide and activated charcoal crushed together were used as traditional means of water coagulants .The impurities in water became suspended particles and gradually settled to the bottom of the container used .Large heavy particles settled out readily, smaller and lighter particles settled down more slowly . Conventional water treatment chemicals (0.25% aluminum sulphate solution and 0.25 % polyelectrolyte ) were added to another sample of the same waste water and the impurities were brought together into larger, heavier masses of solids called floc which also settled down . In both samples chlorine as sodium hypochlorite in granular form was added 2.5g while softening was achieved by adding 0 .25 % Soda ash -sodium trioxocarbonate (iv) Na2CO3 . In both samples results show the values of the physicochemical parameters (Conductivity Turbidity Odour Temperature oC Colour Suspended Solids mg/L Oil in Water mg/L Total Dissolved Solids mg/L and Total Solids mg/L ) reduced almost to zero levels and close to WHO/NIGERIA Allowable Standards 2005. This renders credibility to the use of both conventional and local materials for water treatment effectively and the need to source for more environmentally local materials for such purpose . Keywords: Physico-Chemical, Waste Water, Heavy Particles, Sustainability, Turbidit

Polarization Control by Using Anisotropic 3-D Chiral Structures

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Fluctuations of radiation from a chaotic laser below threshold

Radiation from a chaotic cavity filled with gain medium is considered. A set of coupled equations describing the photon density and the population of gain medium is proposed and solved. The spectral distribution and fluctuations of the radiation are found. The full noise is a result of a competition between positive correlations of photons with equal frequencies (due to stimulated emission and chaotic scattering) which increase fluctuations, and a suppression due to interaction with a gain medium which leads to negative correlations between photons. The latter effect is responsible for a pronounced suppression of the photonic noise as compared to the linear theory predictions.Comment: 7 pages, 5 figures; expanded version, to appear in Phys. Rev.

A review of the design and clinical evaluation of the ShefStim array-based functional electrical stimulation system

Functional electrical stimulation has been shown to be a safe and effective means of correcting foot 12 drop of central neurological origin. Current surface-based devices typically consist of a single channel stimulator, 13 a sensor for determining gait phase and a cuff, within which is housed the anode and cathode. The cuff-mounted 14 electrode design reduces the likelihood of large errors in electrode placement, but the user is still fully responsible 15 for selecting the correct stimulation level each time the system is donned. Researchers have investigated different 16 approaches to automating aspects of setup and/or use, including recent promising work based on iterative learning 17 techniques. This paper reports on the design and clinical evaluation of an electrode array-based FES system for 18 the correction of drop foot, ShefStim. The paper reviews the design process from proof of concept lab-based study, 19 through modelling of the array geometry and interface layer to array search algorithm development. Finally, the 20 paper summarises two clinical studies involving patients with drop foot. The results suggest that the ShefStim 21 system with automated setup produces results which are comparable with clinician setup of conventional systems. 22 Further, the final study demonstrated that patients can use the system without clinical supervision. When used 23 unsupervised, setup time was 14 minutes (9 minutes for automated search plus 5 minutes for donning the 24 equipment), although this figure could be reduced significantly with relatively minor changes to the design