Stephen Mraz

Senior Editor,
Machine Design

Steve serves as Senior Editor of Machine Design.  He has 23 years of service and has a B.S. Biomedical Engineering from Steve was a Flight officer in the U.S. Navy. He is currently responsible for areas such as aerospace and medical.

Walmart tests truck of the future 5

As part of its plan to double the efficiency of its 6,000-truck fleet, Walmart Corp., Bentonville, Ark., worked with several companies to build the Walmart Advanced Vehicle Experience (Wave). It is a testbed of cutting-edge technologies that might show up in the next generation of trucks and trailers used to deliver goods across the country.

Quick-release shaft collar secures components on shafts

It can be difficult for technicians to keep tools and reels secured on smooth shafts. That’s the major reason designers at Amacoil, Aston. Pa., designed EasyLock shaft collars. They hold items on shafts and install quickly without special tools on smooth, case-hardened (Rockwell 55 or higher) shafts.

The collar’s holding force can be manually adjusted from 90 to 1,124 lb. And a quick-release feature makes frequent changeovers easy, which reduces downtime.

Long-range underwater drone uses little fuel 2
The Slocum Glider, an unmanned submarine from Teledyne Webb Research, Falmouth, Mass., takes a different approach to moving through the water. Onboard sensors collect data on the ocean or search for enemy subs or mines. Researchers and engineers are free to design any type of sensor packages for the drone (as long as it fits in the 7-liter payload bay.) So far, sensors have included acoustic probes, hydrophones, optical attenuation detectors, and spectrophotometers.
Giant cable carrier keeps sludge moving

Tiny battery lets researchers track salmon

Army Corps of Engineers’ researchers in Washington Sate have been surgically implanting battery-powered transmitters into salmon to track and monitor their moments through rivers and the ocean. But those batteries were too big and weak to meet some of the researchers’ goals.

Cellulose nanocrystals from plant life could lead to stronger materials

Material engineers at Purdue University are developing methods to use the nanocrystals that naturally give cellulose in trees and plants strength, lightweight, and resilience to strengthen construction materials and automotive components. Researchers modeled the nanocrystal’s atomic structure and calculated it to have a stiffness of 206 gigapascals, comparable to that of steel. The crystals measure 3 × 5 nm, making them too small to study using light microscopes.

Researchers design and build fastest silicon chip

Electrical engineers at Georgia Institute of Technology have determined a transistor designed and built at IHP-Innovations for High Performance Microelectronics in Germany is the fastest silicon-based transistor chip.

Spiderman II uses high and low-tech effects to bring characters alive

Jerome Chen had an arsenal of technologies and “tricks” available as effects supervisor on the new comic-book-driven movie, the Amazing Spiderman 2 from Marvel Comics and Columbia Pictures (opening next month).

Gallery: 2014 Concept Cars: Getting set for tomorrow's showrooms
Fuel-cell cars and hybrids, along with a host of gas-powered muscle cars, luxury sedans, and crossovers , direct from Cobo Hall
DoD tests nuclear-delivery system
Technicians at Sandia National Laboratory tested a B61-11 ground-penetrating bomb built to deliver a nuclear weapon by dropping it from a hoist onto a concrete target.
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