MEMs

Hybrid copter is first of its kind

Regulatory authorities in Germany decided to develop a new aircraft category called volocopter to accommodate the new 18-motor VC200. Read more at https://articles.sae.org/12585.

Posted in: News, Aerospace, Defense
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Canadian researchers employ recycled carbon-fiber mats to produce thermoset composites

Carbon-fiber-reinforced thermoset composites continue to be difficult to recycle, as they are a complex mixture of different materials such as thermosetting polymers, carbon fibers, and fillers. Researchers from the Universite Du Quebec at Montreal, Bell Helicopter Textron Canada, and the National Research Council Canada investigated using carded recycled carbon-fiber mats and epoxy resin to fabricate thermoset composite plates. Read more at https://articles.sae.org/12559.

Posted in: News, Aerospace, Defense
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Overcoming design challenges of next-generation UASs

Next-generation unmanned air systems will require more performance and must integrate increasing capabilities for guidance control, weaponry, and surveillance—all in a very limited space. Read more at https://articles.sae.org/12546.

Posted in: News, Aerospace, Defense
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Heated air technology helps optimize CFRP assembly

Assembly of large and complex carbon-fiber-reinforced plastic (CFRP) components requires the use of liquid resin-based materials for applications such as shimming and aerodynamic sealing. These materials generally require curing times up to 12 h; heated air technology can reduce that time to 2 h. Read more at https://articles.sae.org/12510.

Posted in: News, Aerospace, Defense
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A holistic approach to aircraft assembly

It is the "automation and tooling partner" who offers a performance-based and advanced manufacturing systems integration approach that offers the next step-change, say Bombardier Aerospace and AIP Aerospace Odyssey. Read more at https://articles.sae.org/12568.

Posted in: News, Aerospace, Defense
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Formation and Characterization of Gold Nanoparticles

One-dimensional nanowires are of increasing interest due to their size, physical properties, and other applications in opto-electronics. For example, nanowires have already been used in light-emitting diodes and lasers, photo-detectors, resonant tunneling diodes, field-effect and single-electron transistors, and biochemical sensors. In addition, nanowires are useful because they can be grown almost dislocation-free due to their nano dimension. When dislocation- free nanowires nucleated on the substrate merge to form a continuous film, voids are left underneath, which act as sinks for dislocations, allowing other structures to be grown stress-free on top of the nano-engineered buffer layer.

Posted in: Briefs, Materials, Wiring, Nanomaterials
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Carbon Nanotube Thermal Interfaces Enhanced with Sprayed-On Nanoscale Polymer Coatings

As the semiconductor industry continually strives to increase the power density of single-chip packages, thermal management remains a critical challenge toward realizing both performance and reliability metrics. One of the primary bottlenecks inhibiting effective thermal management arises from the several interfaces that can exist between the chip and heat sink. Specifically, the thermal resistance of the thermal interface materials (TIMs) that are currently used to bridge these interfaces must be decreased. Carbon nanotubes (CNTs), with their extraordinarily high axial thermal conductivity, have generated tremendous interest as candidates for providing low-resistance TIMs. A potentially scalable and low-cost process was developed that utilizes spray coating to deposit thin polymer films onto the tips of CNTs for bonding at room temperature.

Posted in: Briefs, Materials, Coatings Colorants and Finishes, Nanotechnology, Polymers, Semiconductors
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Lipid Layer-Based Corrosion Monitoring on Metal Substrates

Corrosion is a deforming process that costs the United States Department of Defense (DOD) approximately $23 billion annually and accounts for 23% of all DOD maintenance. Exhaustive efforts have been made towards the detection and diagnosis of this issue; however, the problem persists. The Army’s “Go Green” initiative has opened the door for research into an environmentally friendly, biologically based corrosion monitoring technique. For this reason, novel research is being conducted on the use of lipid layers in corrosion monitoring.

Posted in: Briefs, Materials, Corrosion, Metals
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UPS Devices Keep UAVs in the Air

The simplistic definition of UAV reads like this:

“An unmanned aerial vehicle (UAV), colloquially known as a drone, is an aircraft without a human pilot on board. Its flight is controlled either autonomously by computers in the vehicle, or under the remote control of a pilot on the ground or in another vehicle.”

Posted in: Articles, Defense, Electronic equipment, Unmanned aerial vehicles
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Free Space Optical Communications System for Advancing Superiority on the Battlefield

Fixed and tactical information networking, especially for defense applications, has begun to require increasing data transmission capacity as the volume of information available to warfighters grows through more sophisticated sensors and capabilities. The breadth of the information grid is growing beyond the capacity of radio frequency (RF) or microwave broadband direct line of sight (DLoS) links. RF systems in particular are gridlocked by a congested spectrum, can be limited by licensing issues, and in hostile environments, can be jammed.

Posted in: Articles, Defense, Data acquisition and handling, Telecommunications
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