Severe shot peening (SSP) was used on additive manufactured 316L by laser powder bed fusion. The effect of the post processing on the surface features of the material was analyzed through residual stress measurements, tensile testing, hardness-depth profiles, and fatigue testing by flexural bending. The results showed that SSP can be utilized to form residual stresses up to −400 MPa 200 μm below the surface. At the same time, a clear improvement on the surface hardness was achieved from 275 HV to near 650 HV. These together resulted in a clear improvement on material strength which was recorded at 10% improvement in ultimate tensile strength. Most significantly, the fatigue limit of the material was tripled from 200 MPa to over 600 MPa and the overall fatigue strength raised similarly from a low to high cycle regime.

This paper describes advantages and peculiarities of class E power amplifier when used in a polar transmitter system. Basic principles about class E and information about different nonlinearities are given. Also, modifying transistor model to switch use is discussed briefly. A 1 GHz, 0.5 W class E power amplifier was implemented for a polar transmitter. Differences between transmitter systems are mentioned and measurements of a total transmitter system performance are presented

Titanium-based lattice structures have gained significant attention in biomedical engineering due to their potential to mimic bone-like behavior and improve implant performance. This study evaluates the performance of bio-inspired Ti64 TPMS Gyroyd and Stochastic lattice structures fabricated via Powder Bed Fusion-Laser Beam (PBF-LB), focusing on their in-vivo and ex-vivo mechanical and biological responses for biomedical applications. Utilizing an SLM 280 HL printer, samples exhibited notable geometric accuracy essential for mechanical integrity. The study highlights significant mechanical properties and geometric precision improvements achieved through chemical etching. Mechanical characterization revealed that the as-built Gyroid lattice had the highest elastic modulus (3.64 GPa) and yield strength (200.65 MPa), which improved post-etching (3.62 GPa and 219.35 MPa, respectively). The Stochastic lattice demonstrated lower yield strength values post-etching (169.81 MPa). In-vivo analyses in horse models, both structures demonstrated excellent biocompatibility and osseointegration with no adverse inflammatory responses. Ex-vivo push-out tests showed that the chemically etched Gyroid structure achieved the highest resistance to push-out force (1645.407 N) and most significant displacement (2.754 mm), indicating superior energy absorption (4920.425 mJ). These findings underscore the critical influence of microstructural design and surface treatments on implant functionality, offering novel insights into improving biomedical implant performance through lattice architecture and post-processing.