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Hydrolytic Stability of Polyurethane-Coated Fabrics Used for Collapsible Fuel Storage Containers

Collapsible fabric fuel tanks have provided critical tactical bulk petroleum storage for military operations for over 50 years. Beginning in the 1940s with the 900 to 3,000-gallon pillow tanks, collapsible fabric tanks have evolved into the primary tactical fuel storage vessels now used by all of the military services.

Posted in: Briefs, Aerospace, Defense, Coatings & Adhesives, Materials, Containers, Storage, Coatings Colorants and Finishes, Fabrics, Fuel tanks, Military vehicles and equipment
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Materials Design Principles for the Dynamic Fracture of Laminar Composite Structures

Crack bridging (e.g., from stitches or pins) and friction have profound and potentially very useful effects on delamination crack growth, controlling growth rates (damage levels) and the energy absorbed. However, the implications for structural design principles have remained quite obscure. The difficulty is that no simple analogue of crack toughness, which underpins static structural design, exists for dynamic cases with large-scale bridging effects. The external shape of the structure and the loading configuration dictate stress waves, frictional contact zones, and crack tip stress intensity factors in a way that is very difficult to approach, other than by brute case-specific numerical simulation. The problem is compounded by the common occurrence of multiple cracking, a complexity that is rarely entertained in laboratory fracture specimen design. Physically sound material models for the important structural problem of multiple, nonlinear cracking in laminated structures with large-scale bridging due to friction and reinforcement had previously remained undeveloped, in spite of the technological importance of these systems.

Posted in: Briefs, Aerospace, Defense, Electronics & Computers, Information Technology, Materials, Finite element analysis, Composite materials
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Development of Hydrophobic Coatings for Water-Repellent Surfaces Using Hybrid Methodology

Coatings that impart hydrophobic properties are of considerable interest. For applications such as aircraft windows, optical components, protective eyewear, and clothing, this type of surface is desired for the material to be soil-repellent and waterresistant. A prime model of a surface with these characteristics can be found in nature – the leaves of the lotus flower have super-hydrophobic properties as a means of self-cleaning.

Posted in: Briefs, Aerospace, Defense, Coatings & Adhesives, Materials, Windows and windshields, Optics, Coatings Colorants and Finishes, Protective equipment
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Researchers Develop Multiphysics Model for Electro-Thermal Analysis of UAV

Vives College University and Kulab (KU Leuven University campus Ostend) in Belgium are undertaking an aeronautical research program for the development of a new UAV aimed at performing scientific missions along the Belgian coastline above the North Sea. The main performance requirement of the UAV, dubbed Litus, is to be electrically powered with a range of 160 km and a payload up to 5 kg.

Posted in: Technology Update, Aerospace, Defense, Simulation Software, Simulation and modeling, Electrical systems, Thermal management, Unmanned aerial vehicles
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Small, Sensitive Antennas

Researchers create metamaterials by carefully designing and fabricating novel structures to exhibit patterns of electromagnetic properties—specifically, dielectric permittivity and/or magnetic permeability—at the micro-or nano-scale. This special spatial arrangement of elements ensures that the volumetric arrays interact with electromagnetic fields in desirable ways.

Posted in: Technology Update, Aerospace, Defense, Antennas, Antennas
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1550 nm Pulsed Laser Diode

OSI Laser Diode, Inc. (LDI) (Edison, NJ) has introduced a 1550 nm pulsed laser diode with an integrated micro lens that delivers a far‑field beam pattern. The beam pattern's divergence is equivalent in both the Fast (perpendicular) and the Slow (parallel) axes of emission. The CVLL 350‑CL90 pulsed laser diode beam divergence (FWHM) is 8 x 8 degrees. The adjusted Far Field pattern offers high coupling efficiency when used with standard spherical lens systems. LDI's new device is RoHS compliant and operates in wavelengths ranging from 1530 nm to 1580 nm, with 1550 nm typical. The operating temperature is 25 degrees C, the pulse width is typically 150 nanoseconds, frequency is 5kHz, the drive current is at 75 W, and peak power is at 22 W.

Posted in: Products, News
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White Light LED Source

Excelitas Technologies Corp. (Waltham, MA) recently announced the X-Cite® 110LED, a new compact white light LED source for fluorescence imaging applications. Using liquid light guide coupling, X‑Cite 110LED delivers broad‑spectrum optical power with exceptional field uniformity at the specimen level via manual, personal computer (PC) and TTL control. An electronic shutter provides fast, sub‑millisecond operation enabling precision in vibration‑sensitive imaging experiments. Providing excitation for DAPI, GFP, mCherry, Cy5 and other commonly used fluorophores, the X‑Cite 110LED is suitable for use on compound or stereomicroscopes. The instant LED on/off capability minimizes photobleaching and phototoxicity in specimens while offering ultra‑fast PC control and TTL triggering.

www.excelitas.com

Posted in: Products
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Nvidia Chipset to Enable Greater Autonomy

Powerful visual computing processors for dashboard displays are now taking on safety-critical driver-assistance functions. Read more at http://articles.sae.org/13314.

Posted in: Articles, News, Aerospace, Defense
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The Drive for Driverless Vehicles

Autonomous vehicles are a hot topic, most noticeably in the automotive world. But automated driving/operation is making significant headway in the off-highway realm as well, especially in mining applications. John Williamson of Komatsu America Corp. and Serge Lambermont of Delphi Electronics & Safety provide some insights on the topic. Read more at http://articles.sae.org/13300.

Posted in: Articles, News, Aerospace, Defense
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Chrysler's new Hellcat V8 gets 707-hp SAE rating

The actual J1349 rating is more than 100 hp more than Chrysler engineers teased in late May. The automaker's first production supercharged V8 uses a Lysholm-type twin-screw supercharger supplied by IHI. The engine's high-output spec required extensive upgrading of engine reciprocating components to handle the extra loads. Read more at http://articles.sae.org/13227.

Posted in: Articles, News, Aerospace, Defense
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