Many copper water lines for municipal drinking water in Santa Fe, New Mexico USA, have developed pinhole leaks. The pitting matches the description of Type I pitting of copper, which has historically been attributed to water chemistry and to contaminants on the copper tubing surface. However, more recent studies attribute copper pitting to microbial induced corrosion (MIC). In order to test for...

Laboratory and flight test evaluations have consistently demonstrated the potential for helmet-mounted display (HMD) presented information to enhance air combat performance. The Air Force Research LaboratoryÕs (AFRLÕs) Helmet-Mounted Sight Plus (HMS+) program seeks to provide further enhancement by enabling the presentation of multi-color symbology and sensor imagery. To take proper advantage o...

Six alkali metal tris(HMDS) magnesiate complexes (HMDS, 1,1,1,3,3,3,-hexamethyldisilazide) containing chiral diamine ligands have been prepared and characterised in both the solid- and solution-state. Four of the complexes have a solvent-separated ion pair composition of the form [{M·(chiral diamine)(2)}(+){Mg(HMDS)(3)}(-)] [M = Li for 1 and 3, Na for 2 and 4; chiral diamine = (-)-sparteine for...

Current technology trends are focused on miniaturizing displays, although for specific applications such as the use of head-mounted displays (HMD) this limits the advancements for a wider field-of-view (FOV) and a negligible overall weight of the optics. Due to the advancements of electronics that benefit from smaller miniature displays, universities and companies are focused on developing this...

We present a new optical design for head-mounted displays (HMD) that has an exceptionally wide field of view (FOV). It can cover even the full human FOV. It is based on seamless lenses and screens curved around the eyes. We constructed several compact and lightweight proof-of-concept prototypes of the optical design. One of them far exceeds the human FOV, although the anatomy of the human head ...

This paper describes the development of an Immersive Learning Virtual Reality Environment (ILVRE) system that can be used as a teaching and learning tool. The system consists of four major components; hardware, interaction technique, software development tool, and teaching/learning content. The fourth component i.e. teaching/learning content has three sub-components; Instructor/Administrator Mo...

First demonstrated in 1968 [Suther68], head-mounted displays [HMDs] have the potential to immerse a user inside a “virtual world,” where the user can view and interact with computer-generated three-dimensional environments. However, today’s systems far fall short of creating completely convincing virtual environments. Much work remains in overcoming limitations in the technologies that drive HM...

Silica-based sol-gel antireflective (AR) optical coatings are critical components of high peak power laser systems. Water vapor and volatile organic compounds can contaminate these coatings, reducing both their antireflective efficiency and laser-damage resistance. Previous work has shown that alkylation of free hydroxyl groups on the silica sol-gel with organosilicon compounds in solution can ...

Data from 55 preterm SGA infants and 55 preterm AGA infants matched for gestational age and sex were reviewed retrospectively. An increased incidence of perinatal hypoxia (30 vs. 18), gastrointestinal problems, minor infections (27 vs. 9), hematological problems and increased mortality (21.8% vs. 7.2%) was observed in the SGA infants. The incidence of HMD was higher in the AGA group (not signif...

In this paper, a photosensor-based latency measurement system for head-mounted displays (HMDs) is proposed. The motion-to-photon latency is the greatest reason for motion sickness and dizziness felt by users when wearing an HMD system. Therefore, a measurement system is required to accurately measure and analyze the latency to reduce these problems. The existing measurement system does not cons...