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Growth Method for Chalcongenide Phase-Change Nanostructures

Nanometer-scale materials can provide smaller devices than those currently available. Ames Research Center, Moffett Field, California Recently, one-dimensional (1-D) nanostructures such as nanowires and nanotubes have become the focal point of research in nanotechnology due to their fascinating properties. These properties are intrinsically associated with low dimensionality and small diameters, which may lead to unique applications in various nanoscale devices. It is generally accepted that 1-D nanostructures provide an excellent test ground for understanding the dependence of physical, electrical, thermal, optical, and mechanical properties on material dimensionality and physical size. In particular, 1-D semiconductor nanostructures, which exhibit different properties as compared with their bulk or thin film counterparts, have shown great potential in future nanoelectronics applications in data storage, computing, and sensing devices.

Posted in: Manufacturing & Prototyping, Briefs

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Dual-Channel Electromechanical Shutter Driver (ESD)

This device controls the electromechanical shutter in a digital or photographic camera. This electronic device is designed to provide optimal control of an electromagnetically actuated shutter used on a digital or photographic camera. The SD36B1 Electromechanical Shutter Driver is designed to provide the drive pulses for opening and closing an electromagnetically actuated shutter. Electromechanical shutters are used when the exposure period for an electronic camera needs to be controlled outside of the range of electronic shuttering capabilities offered by the camera itself.

Posted in: Electronics & Computers, Briefs

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Sub-Nanosecond, Compact, Low-Power Time-Interval Measurement

This innovation is a sub-nanosecond time-interval measurement that is compact and inexpensive, implemented in a field-programmable gate array (FPGA). Currently, high-speed count ers or semi-custom or custom ASICs (application specific integrated circuits) are used for time-interval measurements. They are not nearly as powerful for automatic delay control for the environment (manufacturing, temperature, voltage, aging, and radiation).

Posted in: Electronics & Computers, Semiconductors & ICs, Briefs

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Improvised Diagnostic Strategy for High-Side Switch Power Stage

This technique enables detection of when a power stage fault occurs, and the type of fault. Robert Bosch Engineering & Business Solutions Ltd., Bangalore, India A vehicle electronic control unit consists of various high-side power stages for driving different loads. Common faults that these power stages experience are Short Circuit to Battery (SCB), Short Circuit to Ground (SCG), and Open Load (OL). These faults can occur during either on-state or off-state of the power stage output. It is essential to diagnose a fault such as SCB during switch off-state, SCG during switch on-state, and OL during both on- and off-state of the switch in order to avoid system malfunction or power stage damage.

Posted in: Electronics & Computers, Briefs

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Dispersion of Carbon Nanotubes Into Polymer Matrices to Produce Unique Properties

The present invention addresses the effective dispersion of carbon nanotubes (CNTs) into polymer matrices. The nanocomposites are prepared using polymer matrices and exhibit a unique combination of properties, most notably, high retention of optical transparency in the visible range (i.e., 400 to 800 nm), electrical conductivity, and high thermal stability.

Posted in: Materials, Briefs

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Carbon Nanotube Growth Density Control

This method uses electricity and temperature to control growth density. Ames Research Center, Moffett Field, California This method provides control over the growth density of carbon nanotubes (CNTs) on a relatively coarse scale, with density adjustment over several orders of magnitude, using an applied electrical field or voltage difference that is aligned substantially perpendicular to the substrate surface, which is adjacent to the surface during growth. Control or influence of CNT growth density on a finer scale, estimated at a factor of 2 to 10, is provided using temperature control for the CNT growth process.

Posted in: Materials, Briefs

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Pulsed Plasma Lubricator (PPL) Technology for the In Situ Replenishment of Dry Lubricants in Extreme Environments

Applications include mechanisms that are not easily serviced in the field, including those used in deep sea or arctic oil drilling. NASA missions employing mobility systems and other moving mechanical assemblies for application on Mars, the Moon, and in deep space depend on the reliable operation of these assemblies and their tribological components. Wet lubricants are sometimes used in space applications, but in order to avoid solidification, they often require active heating due to the extreme cold temperatures that are encountered. Dry lubricants, such as molybdenum disulfide (MoS2), are more commonly chosen for space mechanisms because they are not subject to the low-temperature limitations of wet lubricants while also providing superior lubricating properties. A major drawback of dry lubricants is low wear resistance that eventually leads to failure of the assembly as the lubricant is removed.

Posted in: Materials, Briefs

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