6547 research outputs found
Sort by
Machine Learning Algorithms Successfully Predict Mantle Reservoirs of Basalts Using Trace Elements as Proxies for Isotopic Data
No full textIdentifying mantle reservoirs is fundamental to understanding mantle evolution and heterogeneity as well as the origin of Mid-Ocean Ridge Basalts (MORBs) and Ocean Island Basalts (OIBs). The most effective tracers of mantle reservoirs are isotopic ratios, which are minimally fractionated during melting and resistant to alteration. However, isotopic analyses are costly. Bivariate plots of trace elements (TE) and their ratios have also been used as mantle reservoir signatures, but are more susceptible to fractionation and alteration, limiting their diagnostic power compared to isotopes. This study aims to classify mantle reservoirs using machine learning (ML) with TE data alone, reducing the need for costly isotopic data and overcoming the limitations of bivariate TE plots. We compiled global geochemical data from MORBs and OIBs representing four mantle reservoirs: Depleted Mantle (DM or DMM), Enriched Mantle 1 (EM1), Enriched Mantle 2 (EM2), and HIMU (high μ or high time-integrated ²³⁸U/²⁰⁴Pb). Using the H2O package in Python for automated ML (AutoML), we trained supervised algorithms to classify basalts into these reservoir types based on TE input variables. The best H2O model, a Stacked Ensemble, achieved classification accuracy of 72% for all test locations and 84% for typical locations, demonstrating that TEs can effectively serve as isotopic proxies and distinguish between different mantle reservoirs. We repeated this process using an expanded HIMU class in the training data, in order to improve classification performance on the minority class. We developed two open-source classification tools, both Stacked Ensemble models: one classifier for all four mantle reservoirs and one optimized for the minority HIMU class. To our knowledge, this is the first ML classification tool that identifies mantle reservoirs using only TE data, offering a robust and cost-effective alternative to isotopic methods
Chemical management strategies for the invasive Jorō spider, Trichonephila clavata (Araneae: Araneidae)
No full textHistorically, spider management has received relatively little attention in the literature compared to insect pests, and few studies have examined the efficacy of chemical management strategies on orb weaver mortality and web site fidelity. However, the introduction and rapid spread of the Jorō spider, Trichonephila clavata (L. Koch, 1878; Araneae: Araneidae), in North America has created a wave of media and public awareness. Characterized by its large size, bright coloration, dense aggregations, and durable webs, this species has garnered concern from residents who wish to manage this pest. Internet-based advice ranges from using products labeled for arthropod control to common products around the home. Our study evaluated spider mortality from eleven separate products and two control treatments (water and no treatment at all). High doses of pyrethroid pesticides or essential oil and detergent-based pesticides were highly effective in killing T. clavata. Although spraying foaming dish soap and machine lubricant also led to high mortality rates, we do not condone the use of products outside of their registered label use. We also evaluated several products that did not cause high mortality for their potential to cause T. clavata to abandon their webs—a result that may be just as desirable for residents—though none of these products led to high rates of web abandonment. We strongly recommend that property managers carefully weigh the pros and cons and safety aspects of different management strategies (including mechanical management) and assess whether T. clavata management is warranted in the first place
Library Lens October 2025
No full textThe October 2025 edition of Library Lens includes information on International Open Access Week, course reserves, National Book Month, and the library\u27s mid-semester break hours
Panorama Fall 2025
No full textThis printed issue of Panorama includes information on nursing students saving a life, spiritual belonging on campus, an interview with the library\u27s circulation manager, and choosing a major.https://knowledge.e.southern.edu/parent_newsletter/1108/thumbnail.jp
Library Lens February 2025
Full text linkThe February 2025 edition of Library Lens includes information on Campus Research Day Proposals, the library\u27s Valentine’s card craft, accessing The New York Times, and Black History Month
Library Lens March 2025
Full text linkThe March 2025 edition of Library Lens includes information on Campus Research Day Proposals, institutional repository statistics, spring break hours, and Women\u27s History Month
Life With God
Full text link“In the beginning was the Word, and the Word was with God, and the Word was God. He was in the beginning with God,” John 1:1-2, ESV
ePanorama October 2025
No full textThis digital issue of Panorama includes an article about learning for life, FAFSFA, island camping, the Taste of Southern gala, and Southern Serves.https://knowledge.e.southern.edu/parent_newsletter/1109/thumbnail.jp
Library Lens December 2025/January 2026
No full textThe December 2025 Library Lens features information on returning library materials, library apps, custom reading lists, Christmas break hours, and streaming media