Bismaleimide (BMI) resins are commonly used in advanced carbon composites for their high service temperature and excellent mechanical properties. In this study, two different BMI resins were compared: 1) formula RS-8HT, a high-cure temperature resin requiring pressurized consolidation, and 2) formula BMI-2, a lower cure temperature resin compatible with vacuum bag only fabrication. The objective was to identify a suitable high-temperature resin system for hybrid aerospace gear application, however, these materials are applicable to a variety of hot-zone parts. Laminates were fabricated from each resin type and characterized by their fiber volume fraction, compression strength vs. temperature, and glass transition temperature (Tg). Optical microscopy was performed to verify laminate quality. It was found that the carbon/RS-8HT laminates were prone to thermally-induced cracking, especially during post-cure. Carbon/BMI-2 laminates were found to attain a high degree of cure and high Tg

Waller, Matthew, Koudela, Kevin, McIntyre, Sean

Wavy Surfaces for Better Light Control

TBMG-3781910/1/2020

The Internet owes its power to countless light pulses with which enormous amounts of data are sent around the globe via optical fibers. To steer and control these light pulses, various technologies are employed. One of the oldest and most important is the diffraction grating, which deflects light of different colors in precisely determined directions. For decades, scientists have been trying to improve the design and production of diffraction gratings to make them suitable for today's demanding applications. Researchers now have developed a new method by which more efficient and more precise diffraction gratings can be produced.

Mass-Producible, Centimeter-Scale Metalens

TBMG-3779510/1/2020

Metalenses — flat surfaces that use nanostructures to focus light — are used in everything from microscopy to sensors, cameras, and displays. But so far, most of the lenses have been about the size of a piece of glitter. While lenses this size work well for some applications, a larger lens is needed for low-light conditions.

Technology for Obtaining Asymmetries of Stereometric Shapes of the Sealing Rings Sliding Surfaces for Selected Anti-Wear Coatings

2020-01-22299/15/2020

The article presents the methodology of obtaining asymmetric shapes of the sealing rings sliding surfaces. A very high product tolerance of 1 to 3μm stereometric shape was taken into account for various types of wear-resistant materials that meet the requirements of adhesion of the anti-wear coating to the substrate. In particular, an analysis was made of the possibilities of using various product technologies, a modification of the grinder intended for profile grinding of the sliding surface of the rings was carried out, and the process of ring machining was determined. Maintaining the stereometric shape of the sealing rings sliding surface similar to the axisymmetrical model, with a product deviation of no more than a few micrometers, for any measuring section in the cross section on the periphery of the ring, gives the opportunity to verify the impact of this shape on the parameters of oil film and friction loss. Experimental tests were performed determining the product quality of

Wróblewski, Piotr

Laser Technology Assesses Cancer Cells

TBMG-376399/1/2020

Devising the best treatment for a cancer patient requires doctors to know something about the traits of the particular cancer. One of the greatest difficulties in treating cancer is that cancer cells are not all the same. Even within the same tumor, cancer cells can differ in their genetics, behavior, and susceptibility to chemotherapy drugs.

World’s Smallest Imaging Device Could Lead to Improved Heart Treatments

TBMG-375959/1/2020

University of Adelaide Adelaide, Australia

Miniature Electronic Devices Work Under Extreme Pressure

TBMG-376489/1/2020

Miniature devices have seamlessly found their way into pressure-sensing and energy-harvesting technologies because of their ability to be frequently stretched, compressed, or twisted. Despite their force-bearing abilities, it is still unclear if repeated physical stress can damage the working of these miniature devices, particularly if there is already a defect in their construction.

Measuring Surface Roughness with an Atomic Force Microscope

TBMG-376769/1/2020

Thin films and engineered surfaces are used in a myriad of applications including semiconductor electronics, data storage, and precision optics. In many cases, surface roughness and related texture of these device components directly impact their overall quality and performance. Measurements of surface roughness and morphology can be essential, whether to validate an individual processing step or to obtain a quality control metric for the final product.

Ultrafast Camera Captures Transparent Objects and Phenomena

TBMG-374688/1/2020

Phase-sensitive compressed ultrafast photography (pCUP) can take video not just of transparent objects but also of more ephemeral things like shockwaves and possibly even of the signals that travel through neurons. The new imaging system combines a high-speed photography system with phase-contrast microscopy that was designed to allow better imaging of objects that are mostly transparent such as cells, which are mostly water.

Smart Surgical Microscope

TBMG-374698/1/2020

Researchers have shown that hyperspectral imaging and artificial intelligence could predict the presence of cancer cells with 80 to 90% accuracy in 293 tissue specimens from 102 head and neck cancer surgery patients. The smart surgical microscope could help surgeons better detect cancer during surgery, reduce operating time, lower medical costs, and save lives. Hyperspectral imaging is noninvasive, portable, and does not require radiation or a contrast agent.

Multicolor Super-Resolution Imaging Made Easy

TBMG-37354

8/1/2020

Scientists at EPFL have developed robust and easy-to-implement multicolor super-resolution imaging. The approach is based on the simultaneous acquisition of two spectral channels followed by spectral cross-cumulant analysis and unmixing. They exploit fluorophore blinking and spectral crosstalk for the generation of additional color channels with super-resolved images.

New High-Speed Microscope Can Capture Brain Neuroactivity

TBMG-371837/1/2020

Our brain contains tens of billions of nerve cells (neurons) which constantly communicate with each other by sending chemical and electrical flashes, each lasting one millisecond. In every millisecond, these billions of swift-flying flashes travel together in a giant starmap in the brain that lights up a complicated glittering pattern. These are the origins of all body functions and behaviors such as emotions, perceptions, thoughts, actions, and memories; and also, brain disorders, for example, Alzheimer’s and Parkinson’s diseases.

Low-Cost Imaging System Poised to Provide Automatic Mosquito Tracking

TBMG-371847/1/2020

Mosquito-transmitted diseases such as malaria, dengue, and yellow fever are responsible for hundreds of thousands of deaths every year, according to the World Health Organization (WHO). A new low-cost imaging system could make it easier to track mosquito species that carry disease, enabling a more timely and targeted response.

Items per page:

1 – 50 of 1148