STUDY DESIGN Descriptive, cross-sectional design of healthy young adults. Continuous motion monitoring of the cervical spine performed outside of a laboratory setting. OBJECTIVE The objective of this study was to quantify the daily frequency and magnitude of neck motion in healthy human subjects using continuous motion monitoring. SUMMARY AND BACKGROUND DATA Daily frequency and magnitudes o...

The ASTM D 1037 six-cycle accelerated-aging test for wood-based panel products was analyzed to determine how each successive aging cycle and selected steps in each cycle contribute to panel deterioration. Hardboard, particleboard, flakeboard, waferboard, and oriented strandboard were evaluated. The rate of panel deterioration generally decreased with each successive aging cycle. Four cycles of ...

The loss at 210-280 GHz of room temperature waveguides plated with BDT 200 bright gold and Pur-A-Gold 125 soft gold is within ~10% of the theoretical loss based on the DC conductivity of pure gold and the classical skin effect. This is not the case for some other types of gold plating meeting the same ASTM (or MIL) specs but in which a trace of nickel is used as a brightener. Introduction Follo...

External sulfate attack of concrete is a major problem that can appear in regions where concrete is exposed to soil or water containing sulfates, leading to softening and cracking of the concrete. Therefore, it is important that materials selection and proportioning of concrete in susceptible regions be carefully considered to resist sulfate attack. American Society for Testing Materials (ASTM)...

INTRODUCTION Recently, novel polymers including polyetheretherketone (PEEK) and carbon fiber reinforced polymer (CFRP) have been used for spinal cages because of their advantages such as radiolucency, low incidence of artifacts on magnetic resonance imaging scans, less bone subsidence, and the capacity to tailor its mechanical properties, as well as its safety for patients with metal allergies....