Tech Exchange

Microscale Atomic Clock Enables Applications in GPS, and Radio Channel Density

Most atomic clocks are bench-bound, and even portable units can weigh in excess of 10 pounds. This invention is a cesium laser atomic clock that can be constructed using photoresist MEMS (microelectromechanical system) technology. The glass cell measures about 1 cubic centimeter and it operates using only about tens of milliwatts of electricity. The technology can bring timing at atomic clock accuracy to applications such as GPS, frequency hopping for security, and communication channel density. By using a cesium cell, a laser diode, and a photo diode, the system requires no volume resonator to control the frequency of laser light. By using MEMS manufacturing techniques, this miniature atomic clock offers an order of magnitude decrease in size and power consumption, and stability and accuracy comparable to atomic clocks many times its size. Because of its size and power consumption, the clock opens up new opportunities in fields that require miniature, extremely accurate clocks. Get the complete report on this technology at: www.techbriefs.com/tow/200909b.html Email: nasatech@yet2.com Phone: 781-972-0600

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Fluorinated ZDDP Improves Mileage and Reduces Engine Wear

This technology takes ZDDP — Zinc Dialkyl Dithiophos - phate, an anti-wear oil additive — and enhances it by adding fluorine to the chemical backbone. The resulting new molecule improves engine fuel economy by 3%, reduces engine wear from that available with conventional ZDDP, and contains from 100 to 250 ppm of phosphorus to prolong the life of catalytic converters. It contains about a third of the phosphorus in conventional ZDDP, and the phosphate compounds it does produce bind to the fluorine and become embedded in the tribofilm deposited on the contact surfaces. The additive is a liquid, and presents no suspension issues. In grease and in similar lubrication applications, the new molecule is effective at both low-load/high-speed applications and at high-load applications. Fluorinated ZDDP has application in all internal combustion engines; in gasoline, diesel, and natural gas generators; in transmissions and differentials; and in grease and lubrication applications (such as wheel bearings, CV joints, journal boxes, and automated machinery). Get the complete report on this technology at: www.techbriefs.com/tow/200908a.html Email: nasatech@yet2.com Phone: 781-972-0600

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Real-Time Dogfight Guiding System

Successful performance of BFM (Basic Flight Maneuvers) presents the greatest challenge facing combat pilots. Acquiring and maintaining the required skills for dogfights is a long, complicated and costly process. The solution is a system that provides automatic assessment of a situation and automatic recommendation guidance to the pilot. Re c - ommended guidance on the Helmet Mounted Sight/Head Up Display Solution allows different BFM methods and simulates activation of various missiles. The software performs accurate, real-time situation assessment and provides a dynamic guidance to the pilot. These guidance and recommendations will help to enhance the performance of the crew during the participation in a closein maneuvering air combat training. A data link provides real-time relevant data of the trainer aircraft. Aircraft and weapon system performance and limits are input to system software. The system provides constant assessment of the BFM, and a unique algorithm analyzes and provides the realtime solution. Get the complete report on this technology at: www.techbriefs.com/tow/200908b.html Email: nasatech@yet2.com Phone: 781-972-0600

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Low-Cost Engineered Properties for Non- Wovens, Films, and Laminates

A suite of nonwoven technologies offers low-cost mechanical processes that impart specific engineered properties to commodity-priced nonwovens, films, and laminates, and even to non-polymeric materials. A wide range of textures, controllable permeability, aperturing, multilayer composites, elasticity without elastic chemistry, and other features comprises various aspects of the suite. Many of the technologies operate at room temperature, without adhesives, and are suitable to high-speed lines (in excess of 500 FPM). They are compatible with production lines that may need to start and stop. They enhance the performance of low-cost materials — adding strength, puncture resistance, stretch, texture, permeability, and more — in ways that melt-based systems can achieve. They open potential new markets such as a new category of disposable fabric home goods (sheets, curtains, and pillows), new packaging options, and agricultural products. Get the complete report on this technology at: www.techbriefs.com/tow/200907a.html Email: nasatech@yet2.com Phone: 781-972-0600

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Cooler, Quieter Jet Engine for Light-Sport Aircraft and Ultralights

A small jet engine is suitable for light-sport, ultralight, and experimental aircraft, and can replace the vibrating piston engine and propeller combination used in most sport aircraft. Exhaust heat is minimized for safety to 750 °C, so that a suitably insulated cowling can be touched. By minimizing the heat, sound absorbers can be used so that sound output of the engine is also minimized to about 200 dB or less at a measured distance from the exhaust. The engine provides much less vibration than does a conventional propeller and piston engine combination. The engine provides about 500 N (almost 370 foot-pounds) of thrust using a small compressor diameter and a high rotation speed. This engine produces inherently less noise, and in addition uses sound attenuation such as glass fibers and other materials formed as part of the exhaust tube, boundary layers, and other techniques. Using such sound attenuation, as well as bypass air, also serves to insulate the heat-producing portions of the engine from pilot, passengers, and ground personnel. Get the complete report on this technology at: www.techbriefs.com/tow/200907b.html Email: nasatech@yet2.com Phone: 781-972-0600

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Mechanical Mounting/Connection/Release System

The internal mechanism of the connector part of this system works to maintain positioning repeatability and rigidity, and compensates for wear over time, while both the connector and receiver are tapered in two planes to assure repeatable positioning. Together, the two form a rigid connection that can be unlocked and removed in a single plane, with no access to the side faces required for release. The principles of engaging, securing, and releasing the connector of this mount from the receiver remain the same at any scale — from applications in heavy equipment attachments, to medical devices and prostheses, to the scale of nano-machines. Applications include situations where one piece of equipment must be attached rigidly to another in a single direction; for example, attaching down-hole tools for drilling or laparoscopic operating tools where attachment and release can take place in one plane only, with no access to releases on the side. Areas of application include securing shipping containers and in microgravity where applications of side force cause unwanted rotational reaction. Get the complete report on this technology at: www.techbriefs.com/tow/200906a.html Email: nasatech@yet2.com Phone: 781-972-0600

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Shape-Memory Alloys Replace Traditional Electromagnet Actuators

Shape Memory Alloys (SMAs) are metals that “remember” their original shapes. SMA technology can provide the same mechanical movement and required forces of an electromagnetic actuator, but in a more compact form, while removing the need for motors, gearing, or springs. This SMA technology has shown a reduction in weight of up to 50%, a reduction in the space required of up 70%, and a cost reduction of up to 30% compared to traditional electromagnetic actuators. The technology can deliver mechanical movement as well as electrical connectivity, it is intrinsically safe, can be made into a flat but flexible actuator, and can operate around curvatures. Examples of applications are compact and low-weight linear electromechanical actuators; active Bowden cable devices; and temperature-dependent shape-changing actuation, displacement, or reversible surface modification. The technology could be used by the white goods, automation, medical devices, transportation, consumer goods, and leisure goods industries. Get the complete report on this technology at: www.techbriefs.com/tow/200906b.html Email: nasatech@yet2.com Phone: 781-972-0600

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