The National Institute of Standards and Technology Standard Reference Material (SRM) 2460/2461 standard bullets and casings project will provide support to firearms examiners and to the National Integrated Ballistics Information Network (NIBIN) in the United States. The SRM bullet is designed as both a virtual and a physical bullet profile signature standard. The virtual standard is a set of si...

Passive noise reduction methods require thick and heavy barriers to be effective for low frequencies those clasical ones are thus not suitable of frequency generated by devices. Active noise-cancelling casings, where casing walls vibrations actively controlled, an interesting alternative that can provide much higher low-frequency reduction. Such systems, compared classical ANC only local, but a...

Due to construction costs and operational issues have been in this study discuss how strengthen the concrete columns. The results of previous studies on some structures earthquake-prone weakness reinforced inside steel casings surrounding columns is a modern technique used many countries today for rectangular circular concrete. advantages method convenient, economical easy. Reference model colu...

Very little systematic information exists on the occurrence and concentrations of antimony (Sb) in consumer products. In this study, a Niton XL3t field-portable-X-ray fluorescence (FP-XRF) spectrometer was deployed in situ and in the laboratory to provide quantitative information on Sb dissipated in plastic items and fixtures (including rubber, textile and foamed materials) from the domestic, s...

Abstract Cementing operations in wellbores, especially for long casings, are often challenging and prone to deficiencies when not properly planned executed. While exploring exploiting of geothermal resources at temperatures above the critical point water was attempted different drilling projects recent years, well design, procedure run cement production casings became a key challenge engineers....

In this study, a low-cost water level measurement device based on an ultrasonic sensor was developed. The used is Maxsonar MB7389, and the data acquisition system uses ATMega328P Microcontroller. Meanwhile, displayed in real-time computer also stored microSD card where can be retrieved at any time for analysis. choice of MB7389 sensing levels its superiority resistance so that it applied field,...