Advanced Composite Products (United States)

Isolated skeletal lymphoma is a rare subtype of lymphoma, and isolated mandibular involvement is extremely uncommon. We describe a case of isolated mandibular lymphoma detected on 18F-FDG PET/CT, presenting as an 18F-FDG-avid lytic expansile lesion in the left hemimandible, with no other pathologic findings in the body.

The machining of SiC particle-reinforced aluminum alloy composites was performed using a lathe and PCD tools, and the effects of the particle size and the volume fraction of the SiC particles on the machinability was discussed. Composites were fabricated by squeeze casting. The range of the cutting force fluctuations during the cutting of the alloy became slightly narrower due to the reinforcement, while the average values increased due to the reinforcement. The resistance with larger volume fractions was higher. When comparing the composites with different SiC particle sizes within the same volume fraction, there was minimal variation in the resistance. The reinforcement decreased the surface roughness, achieving a finish closer to the theoretical surface roughness, indicating that the reinforcement reduces the formation of the built-up edge during the cutting. The roughness of the composites with 4 μm particles was lower than that of the composites with 25 μm particles. The flank wear of the tool after machining the composite with the 25 μm particles was more severe than that after machining the composites with the 4 μm particles. Larger particles in the composite would promote stress concentration leading to local fractures then the formation of partially agglomerated areas of the pulverized particles on the machined surface. Conversely, smaller particles would distribute the stress more evenly throughout the matrix, thus reducing the stress concentration. This would lead to a smoother surface and decrease in the tool wear.

The first wave of the Covid pandemic saw us facing acute shortages of masks, personal protective equipment, and sanitisers, with even toilet paper disappearing from store shelves. But the Indian small manufacturers seized the opportunity and by the end of last year, we had enough PPE and masks to even export the surplus to other countries. Though we rationed even the lowly surgical masks, people did not hoard or black market any of these. But it gave people the knowledge of what would be required and would be in short supply if the second wave struck. And so started the pandemic profiteering business.

Abstract High speed friction grinding has been used to grind plant and food substances in water but never been explored for grinding of thermoplastics like polylactic acid (PLA), low and high density polyethylene and polypropylene. Such grinding was investigated in this work and was made possible by using 0.5% guar gum solution instead of just water because increasing the viscosity of water reduced their settling and the speed of passing through the grinder. Tensile, flexural, and impact strengths of the plastics were studied and higher grinding efficiency of PLA could be explained by its low elongation‐at‐break compared to low density polyethylene, high density polyethylene, and polypropylene. The microplastics (2000–45 μm) were studied for mass and particle size distributions and by scanning electron microscopy, 13C CP/MAS NMR, Fourier transform infrared spectroscopy, differential scanning calorimetry, and thermogravimetric analysis. In addition, viscosity of guar gum and contact angles was measured. This new technology can produce finely ground microplastics (710–45 μm) for a variety of applications.

The paper deals with aspects of creating a single-component, fast-curing binder ACM 1216, capable of forming a matrix at low temperatures with a short curing period, having high enough strength and performance characteristics.The prospects for the development of polymeric composite materials based of quick cure binder for manufacture of sports industry products are presented.

Developing a mass production method for graphene is essential for practical usage of this remarkable material. Direct exfoliation of graphite in a liquid is a promising approach for production of high quality graphene. However, this technique has three huge obstacles to be solved; limitation of solvent, low yield and low quality (i.e., multilayer graphene with a small size). Here, we found that soluble graphite produced by mechanochemical reaction with salts overcomes the above three drawbacks. Soluble graphite was exfoliated into monolayer graphene with more than 10% yield in five minutes of sonication. The modified graphite was easily exfoliated in a low-boiling point solvent such as acetone, alcohol and water without the aid of a surfactant. Molecular simulation revealed that the salt is adsorbed to the active carbon at the graphite edge. In the case of weak acid salts, the original bonding nature between the alkali ion and the base molecule is retained after the reaction. Thus, alkali metals are easily dissociated in a polar solvent, leading to negative charge of graphene, enabling the exfoliation of graphite in low boiling point solvents. The approach proposed here opens up a new door to practical usage of the attractive 2D material.

A TPU elastomer was modified with N-halamine polymers as a novel food contact surface material with rechargeable antimicrobial activity.

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This paper investigates the potential for using epoxy hydrogels with the addition of fibrereinforcement as a self-actuating fibre reinforced polymer composite. The aim of addingfibre reinforcement is to improve the structural performance whilst maintaining theactuation potential of the system. This study has also investigated the role and function ofdistributed fibrous electrodes in optimizing the magnitude and rate of self-actuation. Itwas found that the inclusion of two-dimensional fibre reinforcement altered theactuation response of the hydrogel from a three-dimensional shape change to anorthotropic response with the actuation concentrated in the through thicknessdirection. Various arrangements of the fibrous electrodes proved successful inenabling actuation. A rudimentary demonstrator was constructed and tested.