Digital Commons Network^™

The Lightsail 2 Solar Sailing Mission Summary, David A. Spencer, John M. Bellardo, Bruce Betts, Justin Mansell, Barbara Plante

Small Satellite Conference

The LightSail 2 mission concluded a 3-year mission in November 2022, having successfully demonstrated controlled solar sailing in low-Earth orbit using a CubeSat platform. Flight data show that LightSail 2 successfully controlled its orientation relative to the Sun, with sustained periods of apogee raising and increasing orbital energy. The LightSail 2 solar sail was 5.6 m on a side and has a total deployed area of 32 m². Four independent triangular aluminized Mylar® sail sections 4.6 microns thick were Z-folded and stowed into four sail bays. The sail segments were deployed by four 4 m Triangular Retractable And Collapsible booms …

Lessons Learned During Testing Through Commissioning Of The Joint Brazil-Us Sport Mission, Lidia Shibuya Sato, Luís Loures, Victor Costa, Rodolfo Wottrich, Ana Carolina Jeronymo, Herbi Júnior, Pedro Lyra Cabral, Renan Menezes, Mateus Oliveira, Thadeu Carvalho, Emerson Oliveira, Denis Vieira, Charles Swenson, Joseph Casas, Linda Krause, Joaquim Costa

Small Satellite Conference

SPORT is an international partnership mission between Brazil and the United States to study ionospheric space weather processes that occur at low latitudes. Operating a CubeSat on orbit is certainly one of the most exciting milestones of a CubeSat project, but it is only a part of the mission. To be able to achieve this milestone the efforts of the engineering team were focused late in the project on the integration, testing, and delivery followed by the on-orbit commissioning of the observatory. This paper details the major events and lessons learned by the SPORT team during these phases of the …

The First Chilean Satellite Swarm: Approach And Lessons Learned, Cristobal Garrido, Elías Obreque, Matias Vidal-Valladares, Samuel Gutierrez, Marcos Diaz Quezada, Carlos Gonzalez, Camilo Rojas, Tamara Gutierrez

Small Satellite Conference

SUCHAI 2, SUCHAI 3, and Plansat are three 3U CubeSats designed, manufactured, integrated, and tested by the Space and Planetary Exploration Laboratory at the University of Chile (SPEL). They were launched into space on April 1, 2022, aboard a D-Orbit ION platform. The ION deployer was carried into space on the SpaceX Falcon 9 Transporter 4 mission. The nanosatellites included payloads and experiments from several other national and international groups, all featuring different missions and configurations.

We developed the three CubeSats simultaneously. Some subsystems are the same, while others are specific to each satellite. They include scientific and technical payloads. …

Capstone: Recovery & Operations Of A Tumbling Small Satellite In Deep Space, Hannah Umansky, Kyle Clarke, Rebecca Rogers, Austin Hannon, Jack Kelly, Tristan Latchu, Austin Williams, Brennan Bryant

Small Satellite Conference

The Cislunar Autonomous Positioning System Technology Operations and Navigation Experiment (CAPSTONE) satellite, deployed in July 2022, experienced a thruster anomaly in September 2022 during its Ballistic Lunar Transfer (BLT) into the Earth-Moon L2 Near Rectilinear Halo Orbit (NRHO). CAPSTONE's primary mission objective to achieve and maintain NRHO serves to validate the cislunar CONOPS contemplated for NASA's Lunar Gateway. Terran Orbital designed and built CAPSTONE, and serves as the operator of the on-orbit spacecraft. Advanced Space owns and operates the CAPSTONE payload and its software on behalf of NASA, as well as performs mission navigation and maneuver design.

This 12U+ lunar …

Click-A: Optical Communication Experiments From A Cubesat Downlink Terminal, William Kammerer, Peter Grenfell, Jacob Harburg, Nicholas Belsten, Hannah Tomio, Paul Serra, Kerri Cahoy, Tim Brothers, Michael Person, Myles Clark, Dani Coogan, John Conklin, David Mayer, Jan Stupl, John Hanson

Small Satellite Conference

The CubeSat Laser Infrared CrosslinK (CLICK) mission is a technology demonstration of low size, weight, and power (SWaP) CubeSat optical communication terminals for downlink and crosslinks. The mission is broken into two phases: CLICK-A, which consists of a downlink terminal hosted in a 3U CubeSat, and CLICK-B/C, which consists of a pair of crosslink terminals each hosted in their own 3U CubeSat. This work focuses on the CLICK-A 1.2U downlink terminal, whose goal was to establish a 10 Mbps link to a low-cost portable 28 cm optical ground station called PorTeL. The terminal communicates with M-ary pulse position modulation (PPM) …

The Radfxsat-2 Mission To Measure Seu Rates In Finfet Microelectronics, Chloe A. Champagne, Brian D. Sierawski, Rebekah A. Austin, James M. Trippe, Kevin M. Warren, Andrew L. Sternberg, Robert A. Reed, Robert A. Weller, Eric Skoog, Gerald W. Buxton Iii, W. Burns Fisher, Robert Davis, Christopher E. Thompson, Mark L. Hammond

Small Satellite Conference

The RadFxSat-2 mission was launched January 17, 2021 with Virgin Orbit's LauncherOne under the NASA ELaNa-20 initiative. RadFxSat-2 carries a radiation effects payload designed to investigate single event upsets (SEUs) in sub-65 nm commercial memories, including a FinFET-based memory. Sub-65 nm technologies have demonstrated enhanced sensitivity to low-energy protons, but current models have not considered low-energy protons as a source of SEUs. Missions utilizing the latest commercial technologies could experience a higher error rate than predicted. RadFxSat-2 was designed to assess SEU rates for FinFET SRAMs operated in low-Earth orbit (LEO), a proton-heavy environment. Details of the mission and data …

Inaugural Mission Concepts-1 Program, Jose L. Núñez, Jesse Olson, Beth Hemmerich, Norman L. Phelps, Shanessa Jackson, Emilia Colman, Sarah Fox

Small Satellite Conference

Learn about the innovative mission design collaboration between the Department of the Air Force Research Laboratory's University Nanosatellite Program (UNP) and NASA that will broaden access to space and strengthen the capabilities and knowledge of higher education institutions, faculty, and students. The presentation will include an overview of the inaugural program, summary of the activities conducted with participating universities, and plans for future programs.

Cfs Basecamp: A Flight Software Stem Education Ecosystem, David Mccomas, William Tandy

Small Satellite Conference

The open-source core Flight System (cFS) Basecamp ecosystem includes several cFS-based STEM educational projects and provides the infrastructure for users to create their own. Basecamp's tool suite and app repositories function much like a smartphone's App Store model. The initial cFS Basecamp installation includes several built-in tutorials that help users learn NASA's cFS application environment and shorten their path to productivity. Online resources describe Basecamp's goal-oriented software/hardware projects. These projects are designed so students understand how to create app-based solutions to meet a particular goal. This approach evolved after years of being engaged with teaching the cFS and learning which …

Model-Based Systems Engineering Education With Cubesat Education Kit "Hepta-Sat Lite", Ryusuke Iwata, Masahiko Yamazaki

Small Satellite Conference

In this study, we propose education using the CubeSat system education kit "HEPTA-Sat LITE" in order to learn Model Based Systems Engineering (MBSE) practically. HEPTA-Sat LITE is a CubeSat system education kit that contains a satellite bus system including a microcomputer, battery, and sensor devices on a single 55mm x 55mm palm-sized board, and has an external power supply and communication interface, making it expandable and versatile. The kit has expansion boards such as a universal board and a breadboard, which can be connected to HEPTA-Sat LITE to easily install other devices. Therefore, participants can experience satellite system development from …

University-Class Spacecraft In 2023: More Missions, More Problems?, Michael Swartwout

Small Satellite Conference

A "university-class" mission is one where the training of the students is as least as important as the in-orbit results from the spacecraft. Since the University of Melbourne's Australis OSCAR 5 launched in 1970, nearly 300 universities around the world have built & launched 720 university-class spacecraft. But, most of these events are recent: more than half of these schools had their first launch in the last five years. Coincidentally, 5 years ago is the last time that a paper like this was presented at the conference. And thus it's worth updating the previous work with all these new data …

Design Of The Hosted Software Application For The Visors Mission, Ebenezer Arunkumar, Antoine Paletta, Glenn Lightsey

Small Satellite Conference

The VIrtual Super Optics Reconfigurable Swarm (VISORS) mission is a distributed space telescope consisting of two 6U CubeSats that utilize precision formation flying to detect and study the fundamental energy release regions of the solar corona. The inherent complexities and risks associated with two spacecraft operating in close proximity, as well as the unique restrictions of the spacecrafts’ design, make careful autonomous execution crucial to the success of the mission. To address these challenges, this paper outlines the development of the Hosted Software Application (HSA) flight software which manages the Guidance, Navigation, and Control (GNC) algorithms, the payload finite state …

Uhf Ground Station For Satellite Communications: The Design, Build, Test, And Lessons Learned, Anargyros Kriezis, Regan Mah, Linda Hu, Celvi Lisy, Zayn Patel, Utsav Gupta, Bernard Adjei-Frimpong, Whitney Lohmeyer

Small Satellite Conference

The Olin Satellite + Spectrum Technology and Policy (OSSTP) Group was founded at Olin College of Engineering to explore real-world, project-based learning with apprenticeship-styled educational experiences in satellite communications. In 2019, OSSTP was awarded the National Science Foundation (NSF) Cubesat Ideas Lab Grant for the Space Weather Atmospheric Reconfigurable Multiscale Experiment (SWARM-EX) mission in collaboration with five other institutions (CU Boulder, Georgia Tech, Stanford, Western Michigan, and University of Southern Alabama) to develop and launch three CubeSats. This mission aims to serve as a pathfinder demonstration of swarm operations at separation distances of 1-1000 km using differential drag and onboard …

Power System Development Of The Agu Remote Innovative Cubesat Alert System -2 – Arica-2, Azumi Izawa, Takanori Sakamoto, Motoko Serino, Kazuma Kamoshida, Nao Urakabe, Tomoya Ushimaru, Yuki Tsuji, Hiroki Kato, Keiju Asano, Chisaki Iwanaga, Marika Kobori, Yoshihiro Takagi, Kazumasa Hiroshi

Small Satellite Conference

We present the power system development of the 2U CubeSat, AGU Remote Innovative CubeSat Alert system -2(ARICA-2). The main goal of the ARICA-2 project is to demonstrate the real-time alert system of transient astronomical sources using commercial satellite network devices. 1U CubeSat ARICA was launched in November 2021. However, we have not been able to send and receive the data at this point. Therefore, we started developing 2U CubeSat ARICA-2, which is an improved version of ARICA, in April 2022. One of the possible causes of the communication problem of ARICA is the power system, such as a negative power …

The Doppler Wind Temperature Sensor (Dwts) Flight Evaluation And Experiments (Tes-16,17), Marcus Murbach, Lawrence Gordley, Joe Gubeli, Benjamin T. Marshall, Arwen Davé, Anthony Colaprete, Alejandro Salas, Ali Kashani, Kwabena Boateng, Avery Brock, Malachi Mooney-Rivkin, Stanley M. Krześniak

Small Satellite Conference

The Doppler Wind and Temperature Sounder instrument (DWTS) developed by Global Atmospheric Technologies and Sciences (GATS) is a simple yet powerful tool with the potential to become a new window through which the study of upper atmosphere dynamics can occur. Based around a defense-grade infrared camera peering through a static gas cell used as a scanning spectral filter, a DWTS instrument can infer wind velocities and kinetic temperatures throughout the stratosphere and lower thermosphere. The DWTS achieves this scanning by measuring the induced Doppler shift and Doppler broadening of emissions as they pass through the DWTS field of view (Gordley, …

Petrel For Astrophysics And Carbon Business, Hiroyuki Kobayashi, Kei Watanabe, Toshiki Ozawa, Kiyona Miyamoto, Yuki Amaki, Moe Yasuda, Keito Otsubo, Haruta Miki, Akihiro Tokuyasu, Daiki Kobayashi, Riku Nishio, Yusaku Ozeki, Katsuki Tashiro, Yusuke Arai, Ryo Saito, Asuka Ohira, Ryotaro Noto, Minori Fukuda, Yoichi Yatsu, Saburo Matunaga, Hiroaki Kobayashi, Toru Nakano, Masashi Uo, Takashi Yoshikawa, Eriko Kusunoki, Yu Murata, Norihide Takeyama, Akito Enokuchi

Small Satellite Conference

A multi-purpose 50kg class microsatellite hosting astrophysical mission and earth remote sensing, "PETREL", will be launched in 2023. In the night side, PETREL observe the ultra-violet sky with a wide-field telescope covering 50 deg^2 for surveying transient objects related to supernovae, tidal disruption events, and gravitational wave events. Our UV telescope can detect the early phase UV emission from a neutron star merger occurred within 150 Mpc. In addition to the satellite observation, PETREL sends a detection alert including the coordinate and brightness of the UV transient to the ground via the real time communication network within several minutes after …

Preliminary Design Of The Darkness Observatory For Fermi National Accelerator Laboratory, Christopher Young, Phoenix Alpine, Michael Lembeck, Juan Estrada

Small Satellite Conference

The "Dark matter as a sterile NEutrino Search Satellite" (DarkNESS) is a collaboration between Fermi National Accelerator Laboratory (Fermilab), University of Illinois Department of Aerospace Engineering's Laboratory for Advanced Space Systems at Illinois (LASSI), and CU Aerospace. Fermilab's project seeks to clarify the X-ray emission spotted by the European Space Agency in galaxy clusters, hypothesized to result from the decay of sterile neutrinos that may be associated with dark matter. Limited by atmospheric interference, ground telescopes cannot discern the weak X-ray signal. A small satellite deployed in low Earth orbit (LEO) outfitted with an advanced Skipper X-ray detector has been …

Lumio, A Lunar Meteoroid Impacts Observer, Lorenzo Provinciali, Lorenzo Pattanaro, Giorgio Saita, Ludovica Bozzoli, Alessandro Balossino, Giovanni Fumo, Alessandro Di Paola, Luca Conterio, Francesco Topputo, Vittorio Franzese, Roger Walker

Small Satellite Conference

Accurate models of the distribution of meteoroids in the Earth-Moon system are needed to predict impacts with space equipment and for safe space exploration. The Moon's lack of atmosphere allows for observation of meteoroid impacts: understanding meteoroids is important for studying asteroids, comets, and near-Earth objects.

The Lunar Meteoroid Impacts Observer (LUMIO) is a CubeSat mission designed to detect and characterize meteoroid impacts on the far side of the Moon. It can detect small meteoroids too faint for Earth-based observations. LUMIO operates in a Halo orbit at Earth-Moon L2 using the LUMIO-Cam, an optical instrument detecting visible light flashes. The …

Development Of Gas Multiplier Counters (Gmcs) Onboard The 6u Cubesat X-Ray Observatory Ninjasat, Tomoshi Takeda, Naoyuki Ota, Syoki Hayashi, Sota Watanabe, Arata Jujo, Amira Aoyama, Yuanhui Zhou, Keisuke Uchiyama, Yuto Yoshida, Toru Tamagawa, Takao Kitaguchi, Yo Kato, Tatehiro Mihara, Kentaro Taniguchi, Teruaki Enoto, Wataru Iwakiri, Masaki Numazawa, Hiroki Sato, Chin-Ping Hu, Hiromitsu Takahashi, Hirokazu Odaka, Tsubasa Tamba

Small Satellite Conference

We report the development of Gas Multiplier Counters (GMCs) onboard the 6U CubeSat X-ray observatory NinjaSat, scheduled to be launched in October 2023. GMC is a 1U-size non-imaging gas X-ray detector sensitive to 2–50 keV X-rays, and two identical GMCs are mounted on NinjaSat. GMC consists of a gas cell filled with a xenon/argon/dimethyl ether (75%/24%/1%) gas mixture with a pressure of 1.2 atm at 0^◦C, a high voltage supply and analog signal processing board, a digital signal processing board, an X-ray collimator of a 2.1◦ field of view, and an iron-55 calibration source. The most significant feature …

Development And Implementation Of Automated Planning In Cubesats, Liam Riley, Vedika Ghildyal, Cameron Bonesteel, Deepak Mishra

Small Satellite Conference

The University of Georgia’s (UGA) Small Satellite Research Laboratory (SSRL) is developing two CubeSat missions, each with ambitious operational goals that require accounting for a large number of variables. Given the inherent difficulty of fulfilling these requirements without complex onboard autonomous decision-making software, an automated ground-based solution is desirable. To meet this demand, SSRL is implementing an operational pipeline to effectively integrate the newly authored Multi-aspect Automated Satellite Scheduler (MASS) into both missions. MASS is administered and tested by SSRL’s Mission Operations and Flight Software teams. MASS implements a complex decisional tree informed by CubeSat operational requirements, and determines operational …

Developing Intelligent Space Systems: A Survey And Rubric For Future Missions, Mary Dahl, Christine Page, Kerri Cahoy, Evana Gizzi

Small Satellite Conference

Space exploration continues to inspire the development of advanced technologies to explore the universe. From moon landings and the Mars rovers to the recent successful deployment of the James Webb Telescope, space exploration continues to push the limits of what is possible in both science and technology and to pave new ways for the discovery of our galaxy. While we have seen great advancements and barriers broken, we remain limited in our ability to optimize science discovery without onboard intelligent capabilities to enable complex system missions. In this paper, we focus on AI technologies and cross-disciplinary directions for sparking research …

Freeze-Drying As Chromobacterium Violaceum's Preservation Method For The Bixo Mission, Martín Blanco Prego, Zavier Manuel De Rada Piñeiro, Manuel Diz-Folgar, Daniel García-Lojo

Small Satellite Conference

Over the past few years, the space sector has witnessed a growing interest in exploring how biological organisms, such as Escherichia coli or Saccharomyces cerevisiae, respond to high radiation and microgravity environments. Among the various biological space missions, CubeSats, particularly SmallSats, have emerged as a popular platform for conducting such experiments owing to their reduced size and cost-effectiveness, which allows for the integration of miniaturized labs to study microorganisms onboard. However, the biggest challenge facing such missions is the preservation of living organisms for extended periods before the start of the experiments.

The UVigo SpaceLab team is currently developing a …

Data Sharing In Satellite Systems: Review Of The Past And Opportunities In The Age Of Large Leo Constellations, Anargyros Kriezis, Nicolas Lee, Sigrid Elschot, Kaitlyn Fleming, Zayn Patel, Neel Dhulipala, Whitney Lohmeyer

Small Satellite Conference

Since 1957, more than 14,000 satellites have been launched into space; 2022 marks a record year with the launch of 2,163 satellites [1]. The increased number of satellites in combination with technological advancements in satellite communications has enabled operators to collect vast amounts of science data and satellite telemetry. These large data sets can be utilized to ensure coexistence between the ever-increasing number of satellite systems, potentially reducing both the risk of harmful interference and in-orbit collisions. Additionally, they can act as decentralized information sources, improving our understanding of the space environment and increasing the reliability of satellites. Modern data …

Characterization And Modeling Of Rectifying Antennas For Space-To-Space Power Transmission, Leilani Baker, Zack Daniels, Samantha Korfe, Will Hamel, Chad Rathbun, Ricardo Quintana, Dante Orona Yang, Hailey Holder, Joseph Likar, Steve Lindsley, Rachel Delaney, Constance Moyer, Christopher Rodenbeck, Brian Tierney

Small Satellite Conference

Wireless electrical power transmission, also known as power beaming, is an old idea with renewed interest that has the potential to create a new solar power infrastructure. COSMIAC, a research center of The University of New Mexico School of Engineering, in partnership with the Air Force Research Laboratory (AFRL) and Operational Energy – Innovation (OE-I) fund is developing a ground-based experiment aimed at supporting space-based wireless power transmission called Wolf. In parallel, AFRL is developing Arachne to demonstrate space-based power transmission to various receivers. The Wolf project is evaluating design concepts for potential rectenna-powered CubeSats by demonstrating ground-based power beaming …

Developing A Comprehensive Power Simulation Model For The Memesat-1 Cubesat Using Orbital Dynamics, Matthew Knauss, Ali Batu Ozdener, Vedika Ghildyal, Sydney Whilden, Deepak R. Mishra

Small Satellite Conference

The University of Georgia’s Small Satellite Research Lab’s Mission for Education and Multimedia Engagement Satellite (MEMESat-1) requires the use of variables such as power generation, power draw, orbital path, packet size, and data processing times. As power generation and charge varies, MEMESat-1 will automatically transition through three operational modes to prevent battery depletion and halt system processes in case of anomalies.

Taking these variables and operational modes into account, the MEMESat-1 Mission Operations (MOPS) team will use FreeFlyer software to analyze power generation and draw during MEMESat-1’s orbital cycle. The power limitations of MEMESat-1 are budgeted based on battery and …

Automating Spacecraft Analysis: The Era Of Ontological Modeling & Simulation, Michael Halvorson, Noah Moyers, Carlos Domani, Johny Corona, Matthew Gillis, Sean Price, Aiden Raley, Andrew Crudup, Andrew Walter, Coleman Deschepper, Grant Gravitt, Jacob Wilkins, Nik Dreicer, Seth Porter, Tyler Babinec, Tyler Johnson, Nicolas Tsolas, L. Dale Thomas

Small Satellite Conference

Verification by analysis is a predicted compliance of a design to imposed requirements. The levels of performance specified by performance requirements can be related to Technical Performance Measures (TPM) in a Model-Based Systems Engineering (MBSE) environment, but engineers performing verification by analysis are not commonly versed in professional Systems Engineering (SE) techniques or modeling languages such as SysML. As the formal application of Systems Engineering (SE) results in a diminution of time, effort, and money for large-scale projects, enabling technical engineers performing verification by analysis to contribute to MBSE improvements in the course of their daily work is financially incentivized. …

Escarabajo Japonés, Lori Spears, Diane Alston, Marion Murray, Joey Caputo, Kristopher Watson, Celina Wille

All Current Publications

El escarabajo Japonés es una plaga invasora que puede ser muy destructiva para plantas ornamentales, árboles, arbustos, césped, y algunas frutas y hortalizas. El EJ probablemente se introdujo desde Japón al este de los EE. UU. en 1916 durante envíos de plantas ornamentales. Ahora está establecido en la mayoría de los estados del este y algunos del medio oeste.

Tremblings, August 2023, Western Aspen Alliance

Tremblings

What drives oystershell scale invasions?

Connor Crouch

Kristen Waring

If you work with aspen in the American West, you may have heard of the invasive insect oystershell scale (OSS; Lepidosaphes ulmi). OSS was first observed causing aspen mortality in Arizona in 2016, and occurrences have since been observed in Utah, Nevada, and Idaho. One of the first questions we hear from practitioners about OSS-infested aspen is, “what’s causing these outbreaks?” This is an interesting question because OSS has been in North America for centuries and was documented on aspen in Arizona as early as the 1990s, but elevated incidents …

Utahns Are Becoming More Likely To Say Human-Caused Climate Change Is Happening, Jessica D. Ulrich-Schad, Jennifer E. Givens, Peter D. Howe, Cole Lancaster

Utah People and Environment Poll (UPEP)

Scientists who study the earth’s climate overwhelmingly agree that human activities are causing rapid change¹ . Most Americans also agree that global warming is happening (74%) and caused by humans (61%)² . However, the same research finds that about one in eight (12%) of Americans do not think global warming is happening. This indicates that despite scientific consensus, some Americans remain skeptical about whether climate change is real and if humans are the cause.

Quantifying The Impacts And Assessing The Permeability Of A Divided Four-Lane Highway On Migratory Mule Deer, Daniel P. Taylor

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Increased human development and expansion has led to an ever-growing transportation network, which has both direct and indirect ecological impacts to local wildlife populations. In response, wildlife crossing structures have become an increasingly fundamental component of wildlife conservation throughout the United States. The focus of this study was a 13.5 km section of US Highway 395, Mono County, California. The California Department of Transportation recently identified this section of highway, hereafter known as the Mammoth Wildlife Crossing, as the highest priority location for wildlife crossing structures along US 395 within Mono County. The goal of this study was to use …

Water Conservation Through Drought-Resilient Landscape Plants And Deficit Irrigation, Ji-Jhong Chen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Increases in urban population and inadequate rainfall result in imbalanced water budgets in urban and sub-urban regions. Water conservation becomes important in urban landscapes because of increased water demands. Modern landscape designs require drought-resistant plants to maintain urban landscape greenness during water scarcity. Irrigating plants at their irrigation requirements, which is the minimum irrigation rate that can achieve acceptable aesthetic quality, can also conserve water. However, the drought tolerance and irrigation requrements of most landscape plants have not been widely evaluated. Shepherdia ×utahensis ‘Torrey’ (‘Torrey’ buffaloberry) and Penstemon species (beardtongues) are low-water-use landscape plants, but their drought resistance mechanisms are …