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Principal Investigator: Mario Damiano (Renyu Hu is Co-PI) |
Program: James Webb Space Telescope Cycle 1 Guest Observers |
Funding Period: 2022 – 2024 |
Total Funding: $226,553 |
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A Search for Signatures of Volcanism and Geodynamics on the Hot Rocky Exoplanet LHS 3844b |
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Principal Investigator: Laura Kreidberg (Renyu Hu is Co-PI) |
Program: James Webb Space Telescope Cycle 1 Guest Observers |
Funding Period: 2022 – 2024 |
Total Funding: $176,322 |
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Thermal Structure, Chemistry, and Observational Signatures of Cold Exoplanet Atmospheres |
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Principal Investigator: Renyu Hu |
Program: NASA Exoplanets Research Program |
Funding Period: 2018 – 2022 |
Total Funding: $ 458,552 |
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Constraining Early Mars’s Atmosphere and Habitability with Isotopic Measurements |
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Principal Investigator: Renyu Hu |
Program: NASA Habitable Worlds |
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Page 4 of 23 |
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Extending vehicle and fleet lifespan: Bird case study |
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Scooters need to withstand frequent use, occasionally harsh weather conditions, and prevent tampering. Bird, the first company to offer shared electric scooters, has taken a number of steps to improve fleet durability and retention. |
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DURABILITY: CUSTOM DESIGN AND REGULAR MAINTENANCE |
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Bird invested in R&D to internally design its own e-scooters |
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(Bird Zero, Bird One, and Bird Two) to improve on the consumer models used in earlier operations. The improvements included: |
Custom battery with battery management system; |
A frame more adapted to a shared used, with reinforced parts; |
Long-lasting tires with flat protection; |
Tamper-resistant components (i.e., no exposed cables); |
A regenerative front brake and a rear drum brake with no electronic failure vulnerability. |
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Regular maintenance also contributes to a longer usable life. |
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Investment in local service centers and streamlined maintenance processes allowed for a reduction in the proportion of Bird Zero fleet damaged from 40% to 12%. Key features that contributed to this improvement include: |
Staff presence on street, in-app reporting, and sensors that alert to maintenance needs; |
Regular maintenance performed by in-house mechanics; |
A stock of spare parts in service centers, with part reuse from retired vehicles; |
Weather analytics to remove scooters in case of extreme weather. |
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VEHICLE RETENTION |
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The proprietary design in itself prevents risks from hacking and resale for parts. In addition, specific design developments are made to enhance retention: for instance installation of a superior GPS system, sensors, and algorithms that detect suspicious movement have improved retention of the Bird fleet to close to 90... |
In the future, retention is expected to increase even more as the Bird proprietary models are becoming more numerous in the fleet: between September 2018 and July 2019, the proportion of consumer models went from 98% to 25% of the worldwide fleet, the fleet being now composed of 57% of Bird Zero, 19% of Bird One, and B... |
There is wide variation among providers. Establishing an e-scooter business that is sustainable requires investment in vehicle R&D, technology, and personnel. It can be assumed that providers who have not made these investments have an environmental impact that is moderately to significantly higher than those companies... |
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roughly two months after the survey was completed; participants were reminded how they had responded to particular questions and asked to elaborate, with follow-up questions aiming to gain more insight to the contexts and experiences their initial survey responses could only allude to. We close the results section with... |
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Analysis |
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With regard to analyzing our survey data, we took a mixed-methods approach, as we wanted to see both patterns from the quantitative and qualitative data and how they worked together to craft a fuller picture of varied remote work contexts in which participants were working. In addition to the relevant statistical tests... |
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Table 1. Sample Sentiment Coding |
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Response Positive Neutral Negative Mixed Undetermined |
Fine X |
Prisoned X |
Okay X |
Good X |
Quieter X |
Up & Down X |
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In our coding of the qualitative analysis, we categorized responses to each survey question based on common themes we noted while reading responses. For the second question |
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4 |
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