Military Academy

About: Military Academy is a based out in . It is known for research contribution in the topics: Population & Context (language use). The organization has 2478 authors who have published 3003 publications receiving 33188 citations.

Manufacturing and Mechanical Properties of Glass Bubbles/Epoxy Particulate Composite

Abstract: The objective of this work is to manufacture particulate composites, to measure their compressive mechanical properties and to model the behavior by finite element analysis. Syntactic foams, glass bubbles in epoxy resin, have low density and hence are ofparticular interest for subsea applications. The research reported here is undertaken in the context ofa submersible manipulator. In the laboratory two types of specimens are manufactured and tested. including (a) coupons ofthe same particle size with varied particle volume fractions and (b) coupons of the same particle volume fraction with different particle sizes. From the compressive test, we receive the fracture strength and observe the fracture mechanism. Also the buoyance is obtained. In order to correlate the experimental data, the three-dimensional (3-D) finite element method of axis symmetry and cubic center symmetry is used numerically. The predicted values and locations ofthe maximum tensile stresses of specimens agree well with the failure mechanism. It is found that small particles are stronger than matrix, whilst larger particles are weaker than matrix. A decrease in particle volume fraction increases the strength at fixed particle size. An increase in panicle size increases the strength at fixed particle volume fraction.

Simultaneous versus sequential one-stage combined anterior and posterior spinal surgery for spinal infections (outcomes and complications).

Abstract: To compare simultaneous with sequential one-stage (same anaesthesia) combined anterior and posterior spinal surgery in the treatment of spinal infections in terms of the operation time, blood loss and complication rate. Fifty-six patients who underwent one-stage (same anaesthesia) simultaneous or sequential anterior decompression and posterior stabilisation of the involved vertebrae for spinal infection from January 1994 to December 2002 were reviewed. In group I (n=29), sequential anterior and posterior surgery was performed. In group II (n=27), simultaneous anterior and posterior spinal surgery was performed. With regard to age and gender, there was no statistical difference between both groups (P=0.05). The analysed and compared data between the two groups included the age, gender, blood loss, operation time and postoperative complications. There was a statistically significant difference between the two groups in terms of the duration of surgery, amount of blood transfusion needed and occurrence of major postoperative complications (P 0.05) without a subsequent loss of correction on follow-up radiographic films at a mean follow-up of 6.5 years (range, 3 to 11 years). Simultaneous anterior and posterior surgery is a good alternative procedure. It provides the ability to manipulate both anterior and posterior aspects of the spine at the same time and appears to result in less blood loss, a shorter operative time and fewer complications. However, gaining experience and the availability of two surgical teams are important factors in the success of the procedure.