A Lifetime of Smooth PDF Editing, Conversions and Collaboration is Just $35

That’s exactly how SwifDoo PDF Pro can support you. For a limited time, business owners and professionals can get a Perpetual ...
Macworld on MSN

A PDF editing app for Mac that doesn’t charge monthly

Edit, convert, and organize PDFs on your Mac for just $39.99 (MSRP $79.99) — lifetime access, no subscriptions.

I swear by this free app for adding notes to PDFs

The app easily edits PDFs whether through annotations or direct file editing. It works with text, images, and graphics, and ...
IEEE

An Integrated Topology of Three-Port DC-DC Converter for PV-Battery Power Systems

Abstract: This paper introduces an integrated topology of isolated three-port dc-dc converter (TPC) to interface Photovoltaic (PV) and battery for standalone system. To guarantee zero circulating ...