Sam Wanis - Academia.edu (original) (raw)
Papers by Sam Wanis
Journal of Applied Physics, Jun 1, 2011
The Boltzmann–Ehrenfest (BE) principle of adiabatic invariance, a form of energy conservation, is... more The Boltzmann–Ehrenfest (BE) principle of adiabatic invariance, a form of energy conservation, is utilized for the purposes of predicting field-induced forces acting on a neutral particle placed in an electromagnetic cavity resonator. In a simulation environment, the force was determined using the BE principle and compared to both experimental direct force measurements and to analytical approximation. The results were found to be in good agreement. The BE principle was also applied to measure the force profile in lossless systems. Since this technique of predicting and measuring field-induced forces involves only a knowledge of the adiabatic invariant, resonance frequency shift, and particle position within the cavity, the BE principle offers a noncontact method of measuring noncontact forces. It also has the unique capability of measuring forces that arise as a result of particle-particle and particle-wall force interactions that would, otherwise, be poorly categorized by a single scattering regime for an analytical description and might be difficult to measure directly using physical contact. Furthermore, this capability allows for accurate predictions of the force on more interesting configurations of particles of arbitrary shape or composition placed into arbitrary cavity modes.
2021 IEEE BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium (BCICTS)
2021 IEEE BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium (BCICTS)
Long-term human habitation in space requires the ability to use extraterrestrial materials to bui... more Long-term human habitation in space requires the ability to use extraterrestrial materials to build massive radiation-shielded artificial-gravity stations. The technology of Tailored Force Fields promises to enable formation of desired shapes from multidisperse construction material in microgravity. This paper reports the status of adapting this new technology to a mission plan to build a 5-module, 1-G radiation-shielded station. Theory and experiments using acoustic, optic and microwave fields have been used to generalize this observation into a unified general force field fabrication technology. Engineering estimation showed that the solar energy requirements to form rubble in space into cylindrical habitat modules are quite within reach. Long wavelength radio waves would be appropriate for this application. A 50m diameter, 50m high cylindrical module, shielded to 2m depth, was selected as an extreme test case. Preliminary design estimates show that the input power needed to a rad...
To sustain and expand the human presence in space, a space-based economy must be developed. This ... more To sustain and expand the human presence in space, a space-based economy must be developed. This in turn requires the development of infrastructure to utilize extra-terrestrial resources. This paper revisits concepts for large-scale construction in space from the 1970s, in the context of developing a space-based economy. Developments in robotics, solar power generation, microgravity manufacturing and earth-based launch costs significantly alter the models envisaged in the ‘70s. These changes are illustrated by considering the assembly of the outer shell of a 1 km-radius rotating cylindrical habitat.
To sustain and expand the human presence in space, a space-based economy must be developed. This ... more To sustain and expand the human presence in space, a space-based economy must be developed. This in turn requires the development of infrastructure to utilize extra-terrestrial resources. This paper revisits concepts for large-scale construction in space from the 1970s, in the context of developing a space-based economy. Developments in robotics, solar power generation, microgravity manufacturing and earth-based launch costs significantly alter the models envisaged in the ‘70s. These changes are illustrated by considering the assembly of the outer shell of a 1 km-radius rotating cylindrical habitat.
AIP Conference Proceedings, 2006
Space 2005, 2005
The conceptual design of a machine to generate construction material, sinter surfaces and perform... more The conceptual design of a machine to generate construction material, sinter surfaces and perform final assembly of space station modules is presented. The construction of a 50m diameter, 50m high, and 2m thick cylindrical module out of pulverized rock from a Near-Earth Object is ...
The Journal of the Acoustical Society of America, 2006
AIP Conference Proceedings, 2007
To sustain and expand the human presence in space, a spa ce-based economy must be developed. This... more To sustain and expand the human presence in space, a spa ce-based economy must be developed. This in turn requires the development of infrastructur e to utilize extra-terrestrial resources. This paper revisits concepts for large-scale construction in space from the 1970s, in the context of developing a space-based economy. Developments in robotics, solar power generation, microgravity manufacturing and earth-based launch costs significantly alter the models envisaged in the ‘70s. These changes are illustrated by considering the assembly of the outer shell of a 1 km-radius rotating cylindrical habitat.
This report describes the second generation (Gen2) of the Superlattice Castellated Field Effect T... more This report describes the second generation (Gen2) of the Superlattice Castellated Field Effect Transistor (SLCFET) amplifier. The SLCFET amplifier is a new device that uses 3-dimensional device geometry to modulate a superlattice of multiple AlGaN/GaN channels. The superlattice enables extremely low source and drain resistances and high output current and power density, while the 3-dimensional, low-resistance T-gate provides good electrostatic control and high gain. The wide bandgap material system also provides a high breakdown voltage. These properties lead to a robust, high performance device for low-noise and power amplifier applications. Process improvements allow the Gen2 device to reach FT/FMAX of 76/130 GHz. At 10 GHz, noise characterization achieves a minimum NFmin of 0.699 dB and load pull measurements achieve over 70% peak Power Added Efficiency (PAE).
2000 Annual Conference Proceedings
Systems Contamination: Prediction, Control, and Performance 2016
AIP Conference Proceedings, 2006
ABSTRACT
Journal of Applied Physics, Jun 1, 2011
The Boltzmann–Ehrenfest (BE) principle of adiabatic invariance, a form of energy conservation, is... more The Boltzmann–Ehrenfest (BE) principle of adiabatic invariance, a form of energy conservation, is utilized for the purposes of predicting field-induced forces acting on a neutral particle placed in an electromagnetic cavity resonator. In a simulation environment, the force was determined using the BE principle and compared to both experimental direct force measurements and to analytical approximation. The results were found to be in good agreement. The BE principle was also applied to measure the force profile in lossless systems. Since this technique of predicting and measuring field-induced forces involves only a knowledge of the adiabatic invariant, resonance frequency shift, and particle position within the cavity, the BE principle offers a noncontact method of measuring noncontact forces. It also has the unique capability of measuring forces that arise as a result of particle-particle and particle-wall force interactions that would, otherwise, be poorly categorized by a single scattering regime for an analytical description and might be difficult to measure directly using physical contact. Furthermore, this capability allows for accurate predictions of the force on more interesting configurations of particles of arbitrary shape or composition placed into arbitrary cavity modes.
2021 IEEE BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium (BCICTS)
2021 IEEE BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium (BCICTS)
Long-term human habitation in space requires the ability to use extraterrestrial materials to bui... more Long-term human habitation in space requires the ability to use extraterrestrial materials to build massive radiation-shielded artificial-gravity stations. The technology of Tailored Force Fields promises to enable formation of desired shapes from multidisperse construction material in microgravity. This paper reports the status of adapting this new technology to a mission plan to build a 5-module, 1-G radiation-shielded station. Theory and experiments using acoustic, optic and microwave fields have been used to generalize this observation into a unified general force field fabrication technology. Engineering estimation showed that the solar energy requirements to form rubble in space into cylindrical habitat modules are quite within reach. Long wavelength radio waves would be appropriate for this application. A 50m diameter, 50m high cylindrical module, shielded to 2m depth, was selected as an extreme test case. Preliminary design estimates show that the input power needed to a rad...
To sustain and expand the human presence in space, a space-based economy must be developed. This ... more To sustain and expand the human presence in space, a space-based economy must be developed. This in turn requires the development of infrastructure to utilize extra-terrestrial resources. This paper revisits concepts for large-scale construction in space from the 1970s, in the context of developing a space-based economy. Developments in robotics, solar power generation, microgravity manufacturing and earth-based launch costs significantly alter the models envisaged in the ‘70s. These changes are illustrated by considering the assembly of the outer shell of a 1 km-radius rotating cylindrical habitat.
To sustain and expand the human presence in space, a space-based economy must be developed. This ... more To sustain and expand the human presence in space, a space-based economy must be developed. This in turn requires the development of infrastructure to utilize extra-terrestrial resources. This paper revisits concepts for large-scale construction in space from the 1970s, in the context of developing a space-based economy. Developments in robotics, solar power generation, microgravity manufacturing and earth-based launch costs significantly alter the models envisaged in the ‘70s. These changes are illustrated by considering the assembly of the outer shell of a 1 km-radius rotating cylindrical habitat.
AIP Conference Proceedings, 2006
Space 2005, 2005
The conceptual design of a machine to generate construction material, sinter surfaces and perform... more The conceptual design of a machine to generate construction material, sinter surfaces and perform final assembly of space station modules is presented. The construction of a 50m diameter, 50m high, and 2m thick cylindrical module out of pulverized rock from a Near-Earth Object is ...
The Journal of the Acoustical Society of America, 2006
AIP Conference Proceedings, 2007
To sustain and expand the human presence in space, a spa ce-based economy must be developed. This... more To sustain and expand the human presence in space, a spa ce-based economy must be developed. This in turn requires the development of infrastructur e to utilize extra-terrestrial resources. This paper revisits concepts for large-scale construction in space from the 1970s, in the context of developing a space-based economy. Developments in robotics, solar power generation, microgravity manufacturing and earth-based launch costs significantly alter the models envisaged in the ‘70s. These changes are illustrated by considering the assembly of the outer shell of a 1 km-radius rotating cylindrical habitat.
This report describes the second generation (Gen2) of the Superlattice Castellated Field Effect T... more This report describes the second generation (Gen2) of the Superlattice Castellated Field Effect Transistor (SLCFET) amplifier. The SLCFET amplifier is a new device that uses 3-dimensional device geometry to modulate a superlattice of multiple AlGaN/GaN channels. The superlattice enables extremely low source and drain resistances and high output current and power density, while the 3-dimensional, low-resistance T-gate provides good electrostatic control and high gain. The wide bandgap material system also provides a high breakdown voltage. These properties lead to a robust, high performance device for low-noise and power amplifier applications. Process improvements allow the Gen2 device to reach FT/FMAX of 76/130 GHz. At 10 GHz, noise characterization achieves a minimum NFmin of 0.699 dB and load pull measurements achieve over 70% peak Power Added Efficiency (PAE).
2000 Annual Conference Proceedings
Systems Contamination: Prediction, Control, and Performance 2016
AIP Conference Proceedings, 2006
ABSTRACT