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- Additive manufacturing (2)
- Open hardware (2)
- 3-D printing (1)
- Distributed manufacturing (1)
- FOSS (1)
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- Firmware (1)
- Free and open source software (1)
- Heat exchangers (1)
- Inactive U.S. patent (1)
- Innovation (1)
- LLDPE (1)
- Laser welding (1)
- Linear low density polyethylene (1)
- Open source database (1)
- Open-source (1)
- Open-source electronics (1)
- Open-source hardware (1)
- Patent (1)
- Personal fabrication (1)
- Polymer laser welding (1)
- Polymer welding (1)
- Printing (1)
- Public domain (1)
- Rapid prototyping (1)
- RepRap (1)
- Transparent conducting oxide; indium tin oxide; plasmonics; wet etching; photovoltaics; optics (1)
Articles 1 - 4 of 4
Full-Text Articles in Engineering
Open Source Database And Website To Provide Free And Open Access To Inactive U.S. Patents In The Public Domain, Yuenyong Nilsiam, Joshua M. Pearce
Open Source Database And Website To Provide Free And Open Access To Inactive U.S. Patents In The Public Domain, Yuenyong Nilsiam, Joshua M. Pearce
Department of Materials Science and Engineering Publications
Although theoretically the patent system is meant to bolster innovation, the current United States Patent and Trademark Office (USPTO) is cumbersome and involves a significant time investment to locate inactive patents less than 20 years old. This article reports on the development of an open source database to find these public domain ideas. First, a search strategy is explained. Then the operation and use of free and open source software are detailed to meet the needs of open hardware innovators. Finally, a case study is presented to demonstrate the utility of the approach with 3-D printing. The results showed how …
Open Source Laser Polymer Welding System: Design And Characterization Of Linear Low-Density Polyethylene Multilayer Welds, John Laureto, Serguei V. Dessiatoun, Michael M. Ohadi, Joshua M. Pearce
Open Source Laser Polymer Welding System: Design And Characterization Of Linear Low-Density Polyethylene Multilayer Welds, John Laureto, Serguei V. Dessiatoun, Michael M. Ohadi, Joshua M. Pearce
Department of Materials Science and Engineering Publications
The use of lasers to weld polymer sheets provides a means of highly-adaptive and custom additive manufacturing for a wide array of industrial, medical, and end user/consumer applications. This paper provides an open source design for a laser polymer welding system, which can be fabricated with low-cost fused filament fabrication and off-the-shelf mechanical and electrical parts. The system is controlled with free and open source software and firmware. The operation of the machine is validated and the performance of the system is quantified for the mechanical properties (peak load) and weld width of linear low density polyethylene (LLDPE) lap welds …
Free And Open-Source Control Software For 3-D Motion And Processing, Bas Wijnen, G. C. Anzalone, Amberlee S. Haselhuhn, Paul G. Sanders, Joshua M. Pearce
Free And Open-Source Control Software For 3-D Motion And Processing, Bas Wijnen, G. C. Anzalone, Amberlee S. Haselhuhn, Paul G. Sanders, Joshua M. Pearce
Department of Materials Science and Engineering Publications
RepRap 3-D printers and their derivatives using conventional firmware are limited by: 1) requiring technical knowledge, 2) poor resilience with unreliable hardware, and 3) poor integration in complicated systems. In this paper, a new control system called Franklin, for CNC machines in general and 3-D printers specifically, is presented that enables web-based three dimensional control of additive, subtractive and analytical tools from any Internet connected device. Franklin can be set up and controlled entirely from a web interface; it uses a custom protocol which allows it to continue printing when the connection is temporarily lost, and allows communication with scripts.
Influence Of Oxygen Concentration On The Performance Of Ultra-Thin Rf Magnetron Sputter Deposited Indium Tin Oxide Films As A Top Electrode For Photovoltaic Devices, Jephias Gwamuri, Murugesan Marikkannan, J. Mayandi, Patrick Bowen, Joshua M. Pearce
Influence Of Oxygen Concentration On The Performance Of Ultra-Thin Rf Magnetron Sputter Deposited Indium Tin Oxide Films As A Top Electrode For Photovoltaic Devices, Jephias Gwamuri, Murugesan Marikkannan, J. Mayandi, Patrick Bowen, Joshua M. Pearce
Department of Materials Science and Engineering Publications
The opportunity for substantial efficiency enhancements of thin film hydrogenated amorphous silicon (a-Si:H) solar photovoltaic (PV) cells using plasmonic absorbers requires ultra-thin transparent conducting oxide top electrodes with low resistivity and high transmittances in the visible range of the electromagnetic spectrum. Fabricating ultra-thin indium tin oxide (ITO) films (sub-50 nm) using conventional methods has presented a number of challenges; however, a novel method involving chemical shaving of thicker (greater than 80 nm) RF sputter deposited high-quality ITO films has been demonstrated. This study investigates the effect of oxygen concentration on the etch rates of RF sputter deposited ITO films to …