Papers – Page 12 – TechConnect Briefs

On the Ideal Diamagnetism of Composite Graphene and Graphite Nanostructures

Rzhevskii A., Chahid S., Dulal R., Teknowijoyo S., Gulian A., Thermo Fisher Scientific, US

Graphite and its derivatives such as graphene have demonstrated many unique properties that are still un- der intense exploration. In particular, these properties are important for microelectronics applications. In our case it was ideal diamagnetism [...]

Impact of Coal-Borne Impurities on Coal-Derived Graphene Quantum Dots

Azenkeng A., Stanislowski N.E., Laumb J.D., University of North Dakota Energy & Environmental Research Center, US

The impact of coal-borne impurities on coal-derived graphene quantum dots (GQDs) has been investigated on four U.S. coal ranks: lignite, subbituminous, bituminous, and anthracite. Preliminary characterization of the GQDs has been done using ultraviolet-visible spectroscopy [...]

Analysis of Lag Phenomena and Current Collapse in Field-Plate AlGaN/GaN HEMTs with High-k Passivation Layer

Komoto K., Saito Y., Horio K., Shibaura Institute of Technology, JP

In AlGaN/GaN HEMTs, slow current transients are often observed even if the gate voltage or the drain voltage is changed abruptly. This is called gate lag or drain lag, and problematic in circuits applications. The [...]

Analysis of High Average Breakdown Fields between Gate and Drain in AlGaN/GaN HEMTs with High-k Passivation Layer

Tomita R., Ueda S., Kawada Y., Horio K., Shibaura Institute of Technology, JP

AlGaN/GaN HEMTs are now receiving great interest for application to high-power microwave devices and high power switching devices. To improve the breakdown voltage, the introduction of field plate is shown to be effective, but it [...]

Enhanced Corrosion Detection By Means of Multispectral Imaging and Postprocessing Techniques

Giegerich W.V., Fedorishin D.C., Forte III L., Christie L., Schneider P.J., Oh K.W., University at Buffalo, US

This research focuses on the implementation of an enhanced corrosion detection algorithm using multispectral imaging techniques and post-processing image filters. Utilizing various combinations of light filters with image enhancement software, we are able to increase [...]

Vascular Test Phantom Metrology For Use In Photoacoustic Applications

Christie L.B., Schneider P., Oh K.W., University at Buffalo, US

The field of photoacoustics is increasing as new discoveries are being made showing potential for a system that is capable of higher resolution medical imaging, noninvasive vital monitoring, and cancer diagnostics. This research focuses on [...]

Post-Process Superfinishing Of Additively Manufactured Components For Next-Gen Space Application: A Primer On The Implementation Of Metal Additive Manufacturing, Its Promises And Challenges, And The Need For Novel Superfinishing Technology

Michaud N.B., REM Surface Engineering, US

Growing adoption of Metal Additive Manufacturing (AM) technologies promises revolutionary beneficial changes in manufacturing, however, in many industries, particularly industries such as Aerospace (with complex qualifying standards), challenges in the form of various defects/flaws (both [...]

Experimental and Analytical Analysis for Advanced Hot Runner Based Injection Molding

Alqosaibi K., Thakur C., Noor H., Almalki A., Duhduh A., Coulter J.P., Lehigh University, US

A novel technology “Rheodrop” was developed to advance the process of hot runner based injection molding. The technology applies controllable shear rate to the polymer melt during and between injection molding cycles. The application method [...]

Vibration Assisted Injection Molding: An Innovative Energy Efficient Processing Technique for Poly-Lactic Acid (PLA) with Enhanced Properties

Gao P., Duhduh A., Xing J., Kundu A., Coulter J.P., Lehigh University, US

This work is focused on the development of time and energy efficient injection molding processing strategies to fabricate semi-crystalline plastic components with enhanced properties. A Vibration Assisted Injection Molding (VAIM) process was devised for this [...]

Investigation of Bulk Metallic Glass Tooling Lifetime for Microinjection Molding

Almalki A., Rajhi A., Noor H., Kundu A., Coulter J.P., Lehigh University, US

The lifetime of a commercially available zirconium based bulk metallic glass (BMG) for microinjection molding (μIM) was investigated in this research. The primary objective was to understand the effect of the molding conditions on the [...]