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Self-Aligning Lug for Adapting Carbon Fiber Rods to a Bolted Metallic Connection

Joint strength is controlled through precise bond line control. Ames Research Center, Moffett Field, California The enormous strength of unidirectional carbon fiber composite rods is difficult to take advantage of at their ends because of inadequate joining technology. Bolting does not work with unidirectional composites, and bonding is difficult due to stiffness mismatches between the metallic and composite connections. Ideally, a thick bond is desired so that the relatively softer adhesive can shear and distribute shear stresses instead of peaking at the ends of the bond. Thick bonds are difficult to obtain and repeatedly control with conventional methods of beads, bonding wire, shim, or tooling. Most of these methods control the minimum thickness of the bond, but do not control the maximum thickness. In addition, traditional joint types such as lap, strap, and scarf are not ideal for this application.

Posted in: Manufacturing & Prototyping, Briefs

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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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