Preprints
Filtering by Subject: Education
Most bivalves and gastropods calcify indistinguishably from dual clumped isotope equilibrium
Published: 2025-05-14
Subjects: Education
Molluscan shell-carbonates are extensively used to reconstruct paleo-temperatures at sub-annual resolution. The accurate application of two widely used temperature proxies, the shell carbonate oxygen isotope (ẟ18O) and carbonate clumped isotope (Δ47) composition, is based on the assumption that kinetics in the DIC-H2O-CaCO3 system were either absent or invariant during shell formation and/or [...]
GeoAI-based Urban Environmental Forecasting: A Remote Sensing Driven Hybrid Deep Learning and Machine Learning Framework
Published: 2025-05-03
Subjects: Education, Engineering
This study presents a hybrid GeoAI forecasting framework for long-term environmental monitoring in Dhaka, Bangladesh, one of the most densely populated and environmentally degraded megacities in the Global South. Using a 25-year record (2000–2024) of multi-source satellite and climate data, we modeled monthly trends in five key variables: Normalized Difference Vegetation Index (NDVI), Bare Soil [...]
ANALYSING THE PLANT VARIETY PROTECTION WITH RESPECT TO FOOD SECURITY IN INDIAN CONTEXT
Published: 2025-04-16
Subjects: Education, Social and Behavioral Sciences
Ending hunger, achieving food security and sustainable agriculture is the second Sustainable Development Goal (SDG) out of seventeen SDGs of United Nations and it aims to ensure food security and nutrition to each individual globally. Plant varieties protection (PVP)and plant breeders’ rights protection agreements and laws like International Union for the Protection of New varieties of Plant [...]
Comparative Analysis of Flood Risk Zoning and Susceptibility Assessment for the Western Corn Belt Plains using Geospatial Techniques
Published: 2025-04-11
Subjects: Education, Engineering
Flooding is among the most destructive natural hazards, causing severe socioeconomic and environmental impacts. Accurate flood susceptibility assessment is critical for effective mitigation and sustainable resource planning. This study integrates Geographic Information Systems (GIS), Remote Sensing (RS), and multi-criteria decision-making (MCDM) methods to evaluate flood vulnerability across four [...]
Geomorphology of Meso-Yardang Formation and Evolution in Fahraj Plain, SE Iran: The Role of Stream Incision, Sandblasting, and Nebkha Transformation
Published: 2025-03-29
Subjects: Education, Engineering
The purpose of this study is to investigate on meso - yardags of Fahraj Plain in SE Iran. The playa on which the yardangs have taken shape has been divided into northern and southern parts as a result of incision by Nesa ephemeral stream . Detailed field investigations were performed and samples were taken to determine the texture, mineralogy and chemical characteristics of mudrocks comprising [...]
Paddy Segmentation Using Google Earth Engine: A Remote Sensing Approach Abstract
Published: 2025-03-20
Subjects: Education, Engineering, Life Sciences
Paddy field segmentation using remote sensing is crucial for agricultural monitoring, yield prediction, and resource allocation. In this research, we employ Google Earth Engine (GEE) for paddy segmentation using Sentinel-2 satellite imagery. Our method leverages Normalized Difference Vegetation Index (NDVI) and Land Surface Water Index (LSWI) to mask paddy fields efficiently. We collected 2000 [...]
Some mechanical and thermal manifestations of the 1908 Tunguska event near its epicenter
Published: 2025-03-19
Subjects: Education, Physical Sciences and Mathematics
This paper is a continuation of a series of works, devoted to various aspects of the 1908 Tunguska event. It is devoted to some manifestations near the epicenter of the event. Many of the manifestations were established back in the 1960s. Recently a couple of works have appeared that reveal previously undetected phenomena, namely, traces of exposure to high temperatures and high pressure. A [...]
Kimberlite, carbonatite and alkaline magmatic systems: definitions, origins, and strategic mineral resources
Published: 2025-02-27
Subjects: Education
This Chapter provides an overview of the nature and origin of kimberlites, carbonatites and alkaline silicate rocks, with emphasis on the strategic mineral deposits linked to these types of mantle-derived volcanism (e.g., diamonds and rare-earth elements). It is demonstrated that many of the critical raw materials hosted by carbonatites and alkaline silicate rocks are essential for the transition [...]
Formation of Mg-silicates in the microbial sediments of a saline, mildly alkaline coastal lake (Lake Clifton, Australia): environmental versus microbiological drivers
Published: 2025-02-11
Subjects: Education
Recent interest in Mg-rich silicate formation stems from their role as valuable paleoclimatic indicators in fluvio-lacustrine environments and their insights into metal geochemical cycling. Traditionally, Mg-silicate genesis in lacustrine contexts is linked to alkaline or saline conditions in closed, evaporitic basins. However, the discovery of interparticle amorphous kerolite-like Mg-silicates [...]
Inclusive Qualifying Exams Toolkit
Published: 2025-02-08
Subjects: Education, Physical Sciences and Mathematics
Doctoral qualifying or comprehensive exams are widely used in the earth and space sciences, yet research on assessment pervasively demonstrates that high-stakes exams are heavily biased and poor predictors of success. To address these issues and work towards broadening participation in these fields, this toolkit presents related-research and strategies for academic units looking to update their [...]
A New Theory of Global Climate and Ecosystem Change Based on Planetary Orbital Variations
Published: 2025-02-05
Subjects: Education, Physical Sciences and Mathematics
Traditional climate change research has primarily focused on internal factors of Earth, particularly the impact of human activities on greenhouse gas emissions. This paper proposes the "Mao's Theory of Global Climate and Ecosystem Change Based on Planetary Orbital Variations", which suggests that changes in Earth's climate and ecosystems are primarily driven by the orbital variations of external [...]
Exploring the Impact of Climate Change on Community Sustainability in Atlantic Canada: A Transdisciplinary Approach
Published: 2025-01-17
Subjects: Education, Social and Behavioral Sciences
This paper examines the significant impacts of climate change on community sustainability in Atlantic Canada, particularly for vulnerable populations. Rising temperatures and sea levels threaten livelihoods, infrastructure, and ecosystems, necessitating a transformative approach to avoid maladaptation. Current strategies primarily rooted in natural sciences and economic models lack the [...]
Influence and Prediction of Planetary Orbital Changes on Earth's Atmospheric Water Vapor Variations
Published: 2025-01-17
Subjects: Education, Physical Sciences and Mathematics
A few people have gradually realized that the superposition effect of different planets in the solar system on Earth under high-speed motion and dynamic equilibrium can sometimes trigger extreme natural disasters. Due to the relatively regular changes in the relative positions of the Sun, Moon, and Earth, this study considers these three planets as independent systems. The orbits of other planets [...]
Submarine fans in the Kribi-Campo sub-basin, offshore Cameroon: Geomorphology and stratigraphic evolution during the Late Cretaceous
Published: 2025-01-08
Subjects: Education
Evaluation of the InSightSeers and DART Boarders mission observer programmes
Published: 2025-01-04
Subjects: Education, Higher Education, Physical Sciences and Mathematics, Planetary Sciences
Encouraging diversity in planetary science requires making a particular effort to bring a broader range of people onto the mission teams that are the backbone of the field. Observer programmes, which offer early-career researchers the chance to embed within a mission team during a science meeting, are one way of doing this. Here we present a quantitative analysis of the effectiveness of two [...]