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Production of Organic Precursors via Meteoritic Impacts and Its Implications for Prebiotic Inventory of Early Planetary Surfaces.
Astrobiology
January 2025
NASA Goddard Space Flight Center, Greenbelt, Maryland, USA.
Meteoritic impacts on planetary surfaces deliver a significant amount of energy that can produce prebiotic organic compounds such as cyanides, which may be a key step to the formation of biomolecules. To study the chemical processes of impact-induced organic synthesis, we simulated the physicochemical processes of hypervelocity impacts (HVI) in experiments with both high-speed C projectiles and laser ablation. In the first approach, a C beam was accelerated to collide with ammonium nitrate (NHNO) to reproduce the shock process and plume generation of meteoritic impacts on nitrogen-rich planetary surfaces.
View Article and Find Full Text PDFTemporal hydrogeochemical evolution of surface water and groundwater in a karst system discharging into a continental-type Ramsar site in the Huasteca Potosina, Mexico.
Environ Sci Pollut Res Int
January 2025
Earth Sciences, Engineering Faculty, Autonomous University of San Luis Potosi, Av. Manuel Nava 8, San Luis Potosí, SLP, Mexico.
Ecosystems such as wetlands have karst groundwater as their primary source of preserving their services and functions. Karst systems are complex hydrogeological systems that are difficult to study because of their complicated functioning mechanism, which requires an interdisciplinary effort based on hydrodynamic assessment and characterization of the hydrogeology of the system. The study area is the Ramsar wetland Ciénaga de Tamasopo (Mexico), which is dependent on the discharge of karst groundwater that is affected by water extraction of extensive sugarcane agriculture and is also the main water source for the rural towns.
View Article and Find Full Text PDFContextual Fine-Tuning of Language Models with Classifier-Driven Content Moderation for Text Generation.
Entropy (Basel)
December 2024
Department of Computer Science and Engineering, College of Engineering Guindy, Anna University, Chennai 600025, India.
Article Synopsis
- The study focuses on improving content suitability for children's cognitive and emotional development using advanced language models like LLaMA, Mistral, and Zephyr.
- Existing filtering methods fall short in catering to the unique aspects of children's literature, prompting the need for a new framework that evaluates and generates appropriate stories.
- Results show that fine-tuned models significantly outperform base models in generating quality content, and a BERT classifier effectively identifies unsuitable material, potentially enhancing educational technology and parental control systems.
Mineralization and metallogenic model of the Laurani high-sulfidation epithermal deposit in northeastern Bolivian Altiplano.
Sci Rep
December 2024
College of Mining Engineering, Guizhou University of Engineering Science, Bijie, 551700, China.
The Laurani high-sulfidation epithermal deposit, located in the northeastern Altiplano of Bolivia, is a representative gold-polymetallic deposit linked to the late Miocene volcanic rocks that were formed approximately at about 7.5 Ma. At Laurani, four mineralization stages are defined.
View Article and Find Full Text PDFSpatiotemporal characterization of the isotopic composition of meteoric waters in Cuba.
Sci Data
December 2024
International Atomic Energy Agency, Isotope Hydrology Section, Division of Physical and Chemical Sciences, Department of Nuclear Sciences and Applications. Vienna International Center, Vienna, Austria.
The stable isotope composition of meteoric water has been widely used to understand hydrological processes worldwide. We present a unique dataset, with the isotopic composition (δO and δH) of meteoric waters, derived from a nationwide study in Cuba. It includes monthly composite and event-based precipitations, from January 2017 to December 2021 (N = 526 and N = 111 respectively).
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