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Joseph M Kasper - One of the best experts on this subject based on the ideXlab platform.

  • natural transition orbitals for complex two Component excited state calculations
    Journal of Computational Chemistry, 2020
    Co-Authors: Joseph M Kasper
    Abstract:

    While the natural transition orbital (NTO) method has allowed electronic excitations from time-dependent Hartree-Fock and density functional theory to be viewed in a traditional orbital picture, the extension to multiComponent molecular orbitals such as those used in relativistic two-Component methods or generalized Hartree-Fock (GHF) or generalized Kohn-Sham (GKS) is less straightforward due to mixing of spin-Components and the inherent inclusion of spin-flip transitions in time-dependent GHF/GKS. An extension of single-Component NTOs to the two-Component framework is presented, in addition to a brief discussion of the practical aspects of visualizing two-Component complex orbitals. Unlike the single-Component Analog, the method explicitly describes the spin and frequently obtains solutions with several significant orbital pairs. The method is presented using calculations on a mercury atom and a CrO2 Cl2 complex.

Peter J Olver - One of the best experts on this subject based on the ideXlab platform.

Paolo Mantenuto - One of the best experts on this subject based on the ideXlab platform.

  • Analog wheatstone bridge based automatic interface for grounded and floating wide range resistive sensors
    Sensors and Actuators B-chemical, 2013
    Co-Authors: Andrea De Marcellis, Giuseppe Ferri, Paolo Mantenuto
    Abstract:

    Abstract In this paper we present a suitable use of Wheatstone bridge-based circuits to employ a novel interface for both grounded and floating wide range resistive sensor estimation. The proposed topology is very simple and, through the use of only Analog blocks in a feedback configuration, allows the automatic and continuous detection and quantification of the sensor resistance. Two circuit variations are proposed: both of them implement the commercial Component Analog multiplier AD633 as voltage controlled resistor placed in the feedback loop to compensate the sensor variations. Electrical measurement results, conducted on a prototype PCB, have shown that, even if the bridge autobalancing operation works in only 1.6 decades depending on the employment of the AD633, through a two-voltage-reading technique, it is possible to estimate up to 5-decades resistive variations, whose range is also settable, with a relative error within 1.5% and with a higher and supply-independent sensitivity, when compared to traditional bridge. This fact, together with its high resolution, has also allowed, in experimental tests performed by using an air quality resistive sensor, to reveal few ppm carbon monoxide particles.

Orlando Wilson - One of the best experts on this subject based on the ideXlab platform.

  • ROBOTIC TECHNOLOGIES FOR MINIMIZING CREW MAINTENANCE REQUIREMENTS IN SPACE HABITATS
    'Wiley', 2021
    Co-Authors: Broemmelsiek Rachel, Calderwood Micah, Hierro, Jaime Callejon, Cueva Rachel, Harvey Rachel, Holmes Scott, Khawaja Imran, Kleyman William, Mnev Peter, Orlando Wilson
    Abstract:

    Gemstone Team ASTROThe International Space Station (ISS) is crewed continuously by astronauts conducting scientifc research in microgravity. However, their work is not limited to scientifc research alone; in fact, logistics, maintenance, and repair tasks on the ISS require more than 80% of available crew time, severely limiting opportunities for performing scientifc experiments and technological development. NASA is planning a new project known as Gateway (also referred to as the Lunar Orbital Platform-Gateway). This station will orbit the Moon and be uncrewed for 11 months per year. Astronauts will only be present in the outpost for a limited period of time and will not always be available for continuous repairs and maintenance, as is required for Gateway to operate. Therefore, robotic system(s) are necessary to regularly accomplish these tasks both in the absence and presence of astronauts. Throughout this project, Team ASTRO (Assessment of Space Technologies for Robotic Operations) explored the feasibility of integrating dexterous robotic systems in space habitat architectures to perform routine and contingency operational and maintenance tasks. Ultimately, this allows for astronauts, when present, to focus on exploration and scientifc discoveries. The team conducted this research through three approaches: Gateway Component Analog taskboard development and end e˙ector assessment, Cargo Transfer Bag (CTB) manipulation and logistics, and AprilTag situational awareness simulation development. Based on analyses and experimental results gained from this research, the team found that robotic systems are feasible alternatives for space habitat operation. Team ASTRO also determined that AprilTags can be used for optimization of the Gateway design to facilitate uncrewed operations and robotic servicing to improve crew productivity when present

Partha Guha - One of the best experts on this subject based on the ideXlab platform.