Programs and Communities
The collection collates collections by schools, centers, programs, and research groups.
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- Creators: School of Sustainability
- Creators: Yu, S.-Q.
- Creators: Baker, Laurie
Description
Evolving Earth observation and change detection techniques enable the automatic identification of Land Use and Land Cover Change (LULCC) over a large extent from massive amounts of remote sensing data. It at the same time poses a major challenge in effective organization, representation and modeling of such information. This study proposes and implements an integrated computational framework to support the modeling, semantic and spatial reasoning of change information with regard to space, time and topology. We first proposed a conceptual model to formally represent the spatiotemporal variation of change data, which is essential knowledge to support various environmental and social studies, such as deforestation and urbanization studies. Then, a spatial ontology was created to encode these semantic spatiotemporal data in a machine-understandable format. Based on the knowledge defined in the ontology and related reasoning rules, a semantic platform was developed to support the semantic query and change trajectory reasoning of areas with LULCC. This semantic platform is innovative, as it integrates semantic and spatial reasoning into a coherent computational and operational software framework to support automated semantic analysis of time series data that can go beyond LULC datasets. In addition, this system scales well as the amount of data increases, validated by a number of experimental results. This work contributes significantly to both the geospatial Semantic Web and GIScience communities in terms of the establishment of the (web-based) semantic platform for collaborative question answering and decision-making.
ContributorsVadjunec, Jacqueline M. (Author) / Radel, Claudia (Author) / Turner II, B. L. (Author) / College of Liberal Arts and Sciences (Contributor) / School of Geographical Sciences and Urban Planning (Contributor) / Julie Ann Wrigley Global Institute of Sustainability (Contributor) / School of Sustainability (Contributor)
Created2016-10-25
Description
The growth rate hypothesis (GRH) proposes that higher growth rate (the rate of change in biomass per unit biomass, μ) is associated with higher P concentration and lower C∶P and N∶P ratios. However, the applicability of the GRH to vascular plants is not well-studied and few studies have been done on belowground biomass. Here we showed that, for aboveground, belowground and total biomass of three study species, μ was positively correlated with N∶C under N limitation and positively correlated with P∶C under P limitation. However, the N∶P ratio was a unimodal function of μ, increasing for small values of μ, reaching a maximum, and then decreasing. The range of variations in μ was positively correlated with variation in C∶N∶P stoichiometry. Furthermore, μ and C∶N∶P ranges for aboveground biomass were negatively correlated with those for belowground. Our results confirm the well-known association of growth rate with tissue concentration of the limiting nutrient and provide empirical support for recent theoretical formulations.
ContributorsYu, Qiang (Author) / Wu, Honghui (Author) / He, Nianpeng (Author) / Lu, Xiaotao (Author) / Wang, Zhiping (Author) / Elser, James (Author) / Wu, Jianguo (Author) / Han, Xingguo (Author) / College of Liberal Arts and Sciences (Contributor) / School of Life Sciences (Contributor) / Julie Ann Wrigley Global Institute of Sustainability (Contributor) / School of Sustainability (Contributor)
Created2012-03-13
Grasshoppers Regulate N: P Stoichiometric Homeostasis by Changing Phosphorus Contents in Their Frass
Description
Nitrogen (N) and phosphorus (P) are important limiting nutrients for plant production and consumer performance in a variety of ecosystems. As a result, the N:P stoichiometry of herbivores has received increased attention in ecology. However, the mechanisms by which herbivores maintain N:P stoichiometric homeostasis are poorly understood. Here, using a field manipulation experiment we show that the grasshopper Oedaleus asiaticus maintains strong N:P stoichiometric homeostasis regardless of whether grasshoppers were reared at low or high density. Grasshoppers maintained homeostasis by increasing P excretion when eating plants with higher P contents. However, while grasshoppers also maintained constant body N contents, we found no changes in N excretion in response to changing plant N content over the range measured. These results suggest that O. asiaticus maintains P homeostasis primarily by changing P absorption and excretion rates, but that other mechanisms may be more important for regulating N homeostasis. Our findings improve our understanding of consumer-driven P recycling and may help in understanding the factors affecting plant-herbivore interactions and ecosystem processes in grasslands.
ContributorsZhang, Zijia (Author) / Elser, James (Author) / Cease, Arianne (Author) / Zhang, Ximei (Author) / Yu, Qiang (Author) / Han, Xingguo (Author) / Zhang, Guangming (Author) / College of Liberal Arts and Sciences (Contributor) / School of Life Sciences (Contributor) / Julie Ann Wrigley Global Institute of Sustainability (Contributor) / School of Sustainability (Contributor)
Created2014-08-04
Description
A large fraction of the world grasslands and savannas are undergoing a rapid shift from herbaceous to woody-plant dominance. This land-cover change is expected to lead to a loss in livestock production (LP), but the impacts of woody-plant encroachment on this crucial ecosystem service have not been assessed. We evaluate how tree cover (TC) has affected LP at large spatial scales in rangelands of contrasting social–economic characteristics in the United States and Argentina. Our models indicate that in areas of high productivity, a 1% increase in TC results in a reduction in LP ranging from 0.6 to 1.6 reproductive cows (Rc) per km[superscript 2]. Mean LP in the United States is 27 Rc per km[superscript 2], so a 1% increase in TC results in a 2.5% decrease in mean LP. This effect is large considering that woody-plant cover has been described as increasing at 0.5% to 2% per y. On the contrary, in areas of low productivity, increased TC had a positive effect on LP. Our results also show that ecological factors account for a larger fraction of LP variability in Argentinean than in US rangelands. Differences in the relative importance of ecological versus nonecological drivers of LP in Argentina and the United States suggest that the valuation of ecosystem services between these two rangelands might be different. Current management strategies in Argentina are likely designed to maximize LP for various reasons we are unable to explore in this effort, whereas land managers in the United States may be optimizing multiple ecosystem services, including conservation or recreation, alongside LP.
ContributorsAnadon, Jose Daniel (Author) / Sala, Osvaldo (Author) / Turner II, B. L. (Author) / Bennett, Elena M. (Author) / College of Liberal Arts and Sciences (Contributor) / School of Life Sciences (Contributor) / Julie Ann Wrigley Global Institute of Sustainability (Contributor) / School of Sustainability (Contributor) / School of Geographical Sciences and Urban Planning (Contributor)
Created2014-09-02
Description
We studied the microbial community structure of pilot two-stage membrane biofilm reactors (MBfRs) designed to reduce nitrate (NO[subscript 3]–) and perchlorate (ClO[subscript 4]–) in contaminated groundwater. The groundwater also contained oxygen (O[subscript 2]) and sulfate (SO[2 over 4]–), which became important electron sinks that affected the NO[subscript 3]– and ClO[subscript 4]– removal rates. Using pyrosequencing, we elucidated how important phylotypes of each “primary” microbial group, i.e., denitrifying bacteria (DB), perchlorate-reducing bacteria (PRB), and sulfate-reducing bacteria (SRB), responded to changes in electron-acceptor loading. UniFrac, principal coordinate analysis (PCoA), and diversity analyses documented that the microbial community of biofilms sampled when the MBfRs had a high acceptor loading were phylogenetically distant from and less diverse than the microbial community of biofilm samples with lower acceptor loadings. Diminished acceptor loading led to SO[2 over 4]– reduction in the lag MBfR, which allowed Desulfovibrionales (an SRB) and Thiothrichales (sulfur-oxidizers) to thrive through S cycling. As a result of this cooperative relationship, they competed effectively with DB/PRB phylotypes such as Xanthomonadales and Rhodobacterales. Thus, pyrosequencing illustrated that while DB, PRB, and SRB responded predictably to changes in acceptor loading, a decrease in total acceptor loading led to important shifts within the “primary” groups, the onset of other members (e.g., Thiothrichales), and overall greater diversity.
ContributorsOntiveros-Valencia, Aura (Author) / Tang, Youneng (Author) / Zhao, Heping (Author) / Friese, David (Author) / Overstreet, Ryan (Author) / Smith, Jennifer (Author) / Evans, Patrick (Author) / Rittmann, Bruce (Author) / Krajmalnik-Brown, Rosa (Author) / Biodesign Institute (Contributor) / Swette Center for Environmental Biotechnology (Contributor) / Julie Ann Wrigley Global Institute of Sustainability (Contributor) / School of Sustainability (Contributor)
Created2014-07-01
Description
Purpose & Background: Serious mental illness among incarcerated people continues to rise within the United States. Correctional officers only receive an average of 13.54 hours of training in special populations, including the mentally ill (Kois et al., 2020). This lack of training leaves new correctional officers inadequately prepared to manage this population in prison. Education is a cost-effective modality to provide a long-term change of practice. Mental health education was provided to New Correctional Officers (NCOs) at a 2,000-bed facility in Southwestern United States during their initial correctional officer training. Internal permissions were granted by the prison internal review board (IRB) and the Arizona State University IRB.
Methods:NCOs (n = 7) were recruited and consented to participate in psychoeducation specific to mentally ill prisoners. Using an evidence-based curriculum developed by Dr. Dana Dehart at the University of South Carolina, NCOs participated in four (4) 1-hour long mental health trainings that were instructor led. Pre/Post assessment tools were completed using a 10-item trauma quiz and a 12- item Mental Health Knowledge Schedule (MAKS) scale assessing participant attitudes towards mental illness.
Results: Participants were primarily male (57 %), White (42%), with an average age range between 31-40 years old, and with a high school degree. Post intervention quiz and MAKS show improved knowledge for all subjects using both tools.
Discussion/Conclusion: This project highlights cost-effective training with significant preliminary results in reducing stigma towards the mentally ill in prison. Furthermore, this information justifies the support, development, and funding for increasing mental health training for correctional staff nationwide.
ContributorsVargas, Ramses (Author) / Baker, Laurie (Thesis advisor) / Arizona State University. College of Nursing & Healthcare Innovation (Contributor)
Created2022-05-07
Description
Objective: Chronic low back pain in adults is a global health and economic problem. Many with back pain experience compromised sleep. While Cognitive Behavioral Therapy (CBT) is a gold standard in improving sleep among individuals with pain, this approach requires trained staff. The sleep hygiene education and meditation techniques, components of CBT, were utilized in patients with chronic low back pain to improve sleep quality.
Methods: Twenty patients with chronic back pain volunteered to receive sleep hygiene education and meditation videos to practice for 12 weeks and participate in 4-weekly phone calls. Participants were assessed at baseline and post-treatment with the Pittsburgh Sleep Quality Index (PSQI). Participants were patients at a local pain clinic with chronic low back pain without untreated mental illness, sleep apnea, or restless leg syndrome. Informed consent was obtained from participants, along with demographic data. Participants received a brochure with education information to engage daily for 12 weeks. Participants were then contacted weekly by phone to review the learned information.
Results: 13 participants completed the post-intervention questionnaire (35 % attrition rate). Mean age was 55.15 yrs. and most were female (n=11). Paired t-test demonstrated that change in pre and post PSQI score, and Medication Use did not show statistical significance (p=0.372; p=0.502). However, Subjective Sleep Quality had clinical significance (p=.022) suggesting individuals thought their sleep have improved.
Discussion: Sleep hygiene education and meditation techniques is an approach for individuals considering non-invasive and cost-effective approach to improve sleep
ContributorsSong, Christine (Author) / Baker, Laurie (Thesis advisor) / Arizona State University. College of Nursing & Healthcare Innovation (Contributor)
Created2022-04-29
Description
Importance: Idiopathic Pulmonary Fibrosis (IPF) is a worldwide deadly disease with a mortality rate of nearly 100% without lung transplantation (IPF Foundation, 2020). The exact cause of this disease is unclear. Evidence has shown that IPF patients have a high risk of having abnormal acid reflux. Chronic acid reflux can worsen IPF prognosis.
Objective: To assess the effectiveness of an online educational intervention in enhancing clinician’s belief, confidence and readiness in implementing an acid reflux screening protocol in IPF patients.
Methods: Physicians and nurse practitioners in primary care and pulmonary specialties within the United States were asked to complete online pre- and post-surveys after reviewing a webpage presenting up-to-date research evidence showing the relationship between IPF and gastroesophageal reflux disease (GERD).
Main Outcomes and Measures: Questionnaires adapted from the Evidence-Based Practice Beliefs and Implementation Scales by Melnyk were utilized to evaluate changes in belief, confidence and readiness to implement evidence-based practice recommendations.
Results: Percentage of participants who strongly believed in acid reflux screening in IPF increased from 60% pre-survey to 80% post survey (M=4.75, SD=0.58). The percentage of participants who thought they were ready to implement this screening protocol decreased from 60% pre-survey to 50% post survey (M=4.44, SD=0.63). More participants felt strongly confident during the post-survey. The pre-survey had 130 views with a completion rate of 12.3%.
Conclusion and Relevance: An online educational tool such as a webpage was an effective way to enhance clinician’s belief and confidence in acid reflux screening in IPF.
Keywords: idiopathic pulmonary fibrosis, gastroesophageal reflux disease, abnormal acid reflux screening, evidence-based practice
ContributorsFoster, Lillian (Author) / Baker, Laurie (Thesis advisor) / Arizona State University. College of Nursing & Healthcare Innovation (Contributor)
Created2021-04-27
Description
ASU’s waste diversion goal is 90% by the fiscal year 2025 and will require collaboration across many departments and programs to be successful. Reducing plastic use, especially single-use plastic, is critical in reaching 90% waste diversion in the supply chain. To reduce supply chain single-use plastics, ASU will need the cooperation of suppliers on efforts like piloting plastic free packaging programs, packaging take back programs, alternative packaging opportunities, or promoting alternative products that contain little-to-no single-use plastic. Creating a proposed approach through identifying strategic external partners, a high-level approach to implementation, and obstacles will impact how future goals and policies are set. Determining impact and added value of the project will help cultivate support from leadership, internal stakeholders, and suppliers. The project focus will include multiple deliverables, but the final output will be a timeline that maps out what plastic streams to eliminate and when to help ASU reach their waste diversion goals. It begins with “low-hanging fruit” like straws and plastic bags and ends with a university free from all non-essential single-use plastic.
ContributorsHarper, Trevor (Author) / Hegde, Sakshi (Author) / McCrossan, Nico (Author) / Knaggs, Cecilia (Author) / Pyne, Chloe (Author) / School of Sustainability (Contributor)
Created2022-05
Description
ASU’s waste diversion goal is 90% by the fiscal year 2025 and will require collaboration across many departments and programs to be successful. Reducing plastic use, especially single-use plastic, is critical in reaching 90% waste diversion in the supply chain. To reduce supply chain single-use plastics, ASU will need the cooperation of suppliers on efforts like piloting plastic free packaging programs, packaging take back programs, alternative packaging opportunities, or promoting alternative products that contain little-to-no single-use plastic. Creating a proposed approach through identifying strategic external partners, a high-level approach to implementation, and obstacles will impact how future goals and policies are set. Determining impact and added value of the project will help cultivate support from leadership, internal stakeholders, and suppliers. The project focus will include multiple deliverables, but the final output will be a timeline that maps out what plastic streams to eliminate and when to help ASU reach their waste diversion goals. It begins with “low-hanging fruit” like straws and plastic bags and ends with a university free from all non-essential single-use plastic.
ContributorsHarper, Trevor (Author) / Hegde, Sakshi (Author) / Knaggs, Cecilia (Author) / McCrossan, Nico (Author) / Pyne, Chloe (Author) / School of Sustainability (Contributor)
Created2022-05